Some standard content:
Chemical Industry Standard of the People's Republic of China
Subject Content and Scope of Application
HG/T 2521--93
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of industrial silica sol. This standard is applicable to industrial silica sol. This product is mainly used in precision casting, papermaking, textile and coating industries. It can also be used as an inorganic binder, catalyst carrier, auxiliary agent for cathode ray tube coating, anti-slip agent in floor wax, etc. Molecular formula: mSiO2·nH,0
2 Reference standards
GB191 Pictorial symbols for packaging, storage and transportation
GB/T601 Preparation of standard solutions for titration analysis (volume analysis) of chemical reagents Preparation of preparations and products used in chemical reagent test methods GB/T 603
GB/T611 General method for density determination of chemical reagents GB1250 Expression and determination method of limit values GB/T6678 General principles for sampling of chemical products
Specifications and test methods for water used in analytical laboratories GB/T 6682
3 Product classification, code and model
The classification, code and model of industrial silica sol are shown in Table 1. Table 1
Note: Code description:
4 Technical requirements
Alkaline sodium type
4.1 Appearance: Milky white translucent colloidal liquid. 4.2 Industrial silica sol should meet the requirements of Table 2. JN-30
Silicon dioxide content code
Stabilizer code
Acid or alkaline code
Approved by the Ministry of Chemical Industry of the People's Republic of China on September 8, 1993SW-20
Acidic stabilizer-free type
Implemented on July 1, 1994
Silicon dioxide (Si)2) content, %
Sodium oxide (Naz0) content, %|| tt||Viscosity (25C), Pas
Density (25C).g/cm2
Average particle size, nm
HG/T2521—93
Alkaline sodium type
8.5～10.0
Acidic stabilizer-free type
9.0～10.5
-325.0×10-35.0×10-3|6.0×1016. 0×10*3|7.0×10-3
Note: If the user has special requirements for the average particle size, it can be negotiated with the manufacturer. 5 Test method
The reagents and water used in this standard, unless otherwise specified, refer to analytical pure reagents and grade 3 water specified in GB/T6682. The standard solutions, preparations and products required in the test shall be prepared in accordance with the provisions of GB/T601 and GB/T603 unless otherwise specified.
5.1 Determination of silicon dioxide content
5.1.1 Summary of the method
Bake the sample and burn it at 800~850℃ to constant weight. Deduct sodium oxide and measure the silicon dioxide content. 5.1.2 Analysis steps
Use a porcelain snail that has been burned to constant weight at 800~850℃ to weigh about 2g of the sample to an accuracy of 0.0002g. Dry it at 105~110℃ and then burn it at 800~850C to constant weight.
5.1.3 Expression of analysis results
The silicon dioxide (SiO2) content (X2) expressed as mass percentage is calculated according to formula (1): m×100-X
Wherein: mi-
mass of the residue after ignition, g;
m—mass of the sample, g;
X2—sodium oxide (Na2O) content measured in Article 5.2, %. 5.1.4 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result, and the absolute difference between the two parallel determination results shall not exceed 0.1%. 5.2 Determination of sodium oxide content
5.2.1 Flame emission photometry
5.2.1.1 Summary of the method
Measure the characteristic electromagnetic radiation intensity emitted by sodium in the flame to determine the sodium content. 5.2.1.2 Instruments and equipment
5.2.1.2.1 Flame photometer with sodium filter. 5.2.1.3 Reagents and materials
HG/T2521--93
5.2.1.3.1 Sodium standard solution: 1 ml of solution contains 0.2 mg of Na. Weigh 0.508 g of sodium chloride (GB1266) burned to constant weight at 500~~600C and dissolve in water. Transfer to a 1000 mL volumetric flask, dilute to scale, and shake well. Store in a polyethylene bottle. 5.2.1.4 Analysis steps
5.2.1.4.1 Drawing of working curve
Into six 100mL volumetric flasks, use a pipette to transfer 0, 2.0, 4.0, 6.0.8.0, 10.0mL of sodium standard solution respectively, dilute with water to the scale, and shake well. On the flame photometer, use a sodium filter, adjust the zero point with water, adjust the scale to 100 with a solution with a sodium content of 20μgNa/mL., and measure the radiation intensity of the above solutions in turn. With the mass of sodium (mg) as the abscissa and the corresponding radiation intensity as the ordinate, draw a working curve. 5.2.1.4.2 Determination
Weigh about 0.5g of alkaline sodium silica sol sample or about 2g of acidic stabilizer-free silica sol sample to the nearest 0.001g, place in a 100mL volumetric flask, add water to the scale, and shake well. On the flame photometer, use a sodium filter, adjust the zero point with water, adjust the scale to 100 with a solution with a sodium content of 20ugNa/mL, and measure the radiation intensity of the test solution. Find the corresponding mass of sodium from the working curve. 5.2.1.5 Expression of analysis results
The sodium oxide (Na2O) content (X,) expressed as mass percentage is calculated according to formula (2): X2=
0. 134 8 X m
× 100=
m X 1. 348
m×1000
Where: mi is the amount of sodium found from the working curve, mg; m is the mass of the sample, g3
1.348 is the coefficient for converting sodium into sodium oxide. 5.2.1.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference between the two parallel determination results is: not more than 0.02% for alkaline sodium silica sol and not more than 0.003% for acidic non-stabilizer silica sol. 5.2.2 Volumetric method (arbitration method, only applicable to alkaline sodium silica sol) 5.2.2.1 Method summary
Use methyl red as the indicator and titrate sodium oxide with hydrochloric acid standard titration solution. 5.2.2.2 Reagents and materials
5.2.2.2.1 Hydrochloric acid (GB/T 622) standard titration solution: c(HCI) about 0.1 mol/L. 5.2.2.2.2 Methyl red (HG 3-958) indicator solution: 2 g/L. 5.2.2.3 Analysis steps
Weigh about 5g of sample, accurate to 0.001g, place in a 250ml conical flask, add 50mL of water, and shake well. Add 3 to 5 drops of methyl red indicator solution, and titrate with hydrochloric acid standard titration solution until the solution changes from yellow to red. This is the end point. 5.2.2.4 Expression of analysis results
The sodium oxide (Na2O) content (X,) expressed as mass percentage is calculated according to formula (3): Xg = g.VX0 031 0 × 100 - 3.10 Xc:V（3
Wherein: C——actual concentration of hydrochloric acid standard titration solution, mol/L; V---volume of hydrochloric acid standard titration solution consumed in titration, mL.; m
m-mass of sample, g;
0.0310————mass of sodium oxide expressed in grams equivalent to 1.00mL hydrochloric acid standard titration solution Lc(HC!)=1.000mol/L]. 5.2.2.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.02%. 189
5.3 Determination of pH value
5.3.1 Summary of method
HG/T 2521-93
Measure the pH value of the sample with an acidometer equipped with a glass measuring electrode and a saturated calomel reference electrode. 5.3.2 Instruments and equipment
5.3.2.1 Acidometer: equipped with a glass electrode and a saturated calomel electrode, with a graduation value of 0.02 pH unit. 5.3.3 Analysis steps
Take 50mL of silica sol sample, place it in a 100mL beaker, use the glass electrode as the measuring electrode and the saturated calomel electrode as the reference electrode, and measure the pH value with an acidometer.
5.3.4 Allowable difference
Take the arithmetic mean of the parallel measurement results as the measurement result, and the absolute difference between the two parallel measurement results shall not exceed 0.2 pH units. 5.4 Determination of viscosity
5.4.1 Method Summary
Measure the resistance of the silica sol to the relative motion between the rotor and the silica sol to express the viscosity of the silica sol. 5.4.2 Instruments and Equipment
5.4.2.1 Constant temperature water bath: temperature fluctuation range is less than 0.5℃. 5.4.2.2 Thermometer: graduation value 0.1℃. 5.4.2.3 Rotational viscometer.
5.4.3 Analysis Steps
5.4.3.1 According to the viscosity of the sample, select the appropriate rotor and speed from the range table of the instrument used. 5.4.3.2 Keep the sample and the rotor at a constant temperature of 25±0.5℃, and keep the sample temperature uniform, and measure the viscosity of the silica sol. 5.4.4 Expression of analysis results
The absolute viscosity (n) of the sample at 25°C expressed in Pa·s is calculated according to formula (4): nK·α
(4)
Wherein: K—coefficient, obtained from the coefficient table of the instrument used; α—the reading indicated by the pointer. wwW.bzxz.Net
5.4.5 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference between the two parallel determination results of JN-40 shall not exceed 1.0×10-3Pa·s, and that of other types and models of silica sol shall not exceed 0.5×10-3Pa·S. 5.5 Determination of density: Weiss balance method
5.5.1 Summary of method
At 25°C, measure the buoyancy of the float in water and in the sample respectively. Calculate the density of the sample based on the density of water and the buoyancy of the float in water and in the sample.
5.5.2 Instruments and equipment
5.5.2.1 Webster balance: The thermometer in the float has a graduation value of 0.1℃. 5.5.2.2 Constant temperature water bath: The temperature can be controlled at 25±0.5℃. 5.5.3 Analysis steps
5.5.3.1 Suspend the float to the end of the balance beam with a fine platinum wire, and adjust the screws on the base so that the pointer tips of the beam and the bracket are aligned with each other. 5.5.3.2 Immerse the entire float in a glass cylinder filled with water that has been boiled and cooled to about 25℃, and no bubbles should be introduced. The glass cylinder is placed in a constant temperature water bath and kept at a constant temperature of 25±0.5℃. Adjust the balance weight to realign the pointer and record the reading. 5.5.3.3 Take out the float and dry it completely. At the same temperature, use the sample instead of water and operate according to 5.5.3.2. 5.5.4 Expression of analysis results
The density (p) of the sample at 25°C expressed in g/cm2 shall be calculated according to formula (5): 190
HG/T 2521--93
Wherein: P1---the reading of the weight when the float is immersed in water; 02--the reading of the weight when the float is immersed in the sample; 0.9971--the density of water at 25°C, g/cm2. × 0. 997 1
5.5.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.01 g/cm2. 5.6 Determination of average particle size
(5)
5.6.1 Summary of the method
Put the silica sol sample into a 200g/L sodium chloride solution, titrate the silanol groups on the surface of the silica sol particles with a standard sodium hydroxide titration solution, and record the volume of the sodium hydroxide standard titration solution consumed when the pH value changes from 4.00 to 9.00. The average particle size of the silica sol particles is calculated by the empirical formula.
5.6.2 Reagents and materials
5.6.2.1 Hydrochloric acid (GB/T622) solution: 1+10. 5.6.2.2 Standard sodium hydroxide (GB/T629) titration solution: c(NaOH) about 0.1mol/L. 5.6.2.3 Sodium chloride (GB/T1266).
5.6.3 Instruments and equipment
5.6.3.1 Acidity meter: equipped with electromagnetic stirrer, glass electrode and saturated calomel electrode, with a graduation value of 0.02 pH unit. 5.6.4 Analysis steps
Weigh a silica sol sample containing about 1.5g of silicon dioxide to an accuracy of 0.01g and place it in a 200mL beaker. Add 100mL of water to dilute, place the beaker on the plate of the electromagnetic stirrer, and insert the glass electrode and saturated calomel electrode into the sample. Use hydrochloric acid to adjust the pH value indicated by the acidity meter to 3-3.5. Add 30g of sodium chloride, add water to about 150mL, dissolve the sodium chloride, and stir evenly. Titrate with sodium hydroxide standard titration solution, and record the volume of sodium hydroxide standard titration solution consumed when the pH is in the range of 4.00~~9.00. 5.6.5 Expression of analysis results
The average particle size (D) of silica sol expressed in μm is calculated according to formula (6): D
320V.c-25
Wherein: V——-the volume of sodium hydroxide standard titration solution consumed during titration, mL; c——-the actual concentration of sodium hydroxide standard titration solution, mol/L. 5.6.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result, and the absolute difference between the two parallel determination results shall not exceed 1.0nm. 6 Inspection rules
6.1 Industrial silica sol shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all industrial silica sols shipped out of the factory meet the requirements of this standard. Each batch of products shipped out of the factory shall be accompanied by a quality certificate in a certain format, including: manufacturer name, product name, category, model, production date, batch number, net weight, certificate that the product quality meets the requirements of this standard and the number of this standard. 6.2 The user has the right to inspect and accept the industrial silica sol received in accordance with the provisions of this standard. The inspection and acceptance should be carried out within one month from the date of arrival of the goods.
6.3 Each batch of products shall not exceed 20t.
6.4 Determine the number of sampling units in accordance with the provisions of Article 6.6 of GB/T6678. When sampling, insert the sampler vertically into the bottom of the packaging container at a speed that the liquid level inside and outside the tube is consistent. The total sampling volume is not less than 500mL. Mix the collected samples and divide them into two clean and dry glass bottles and seal them. Stick labels on the bottles, indicating: manufacturer name, product name, category, model, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for three months for reference. 191
HG/T2521—93
6.5 If any index of the inspection result does not meet the requirements of this standard, the sample should be re-tested from the packaging barrel with twice the amount. If only one index of the inspection result does not meet the requirements of this standard, the whole batch of products cannot be accepted. 6.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Interim Measures for National Product Quality Arbitration Inspection". 6.7 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 7 Marking, packaging, transportation, storage
7.1 The packaging barrel should have firm and clear markings, including: product name, manufacturer name, trademark, category, model, batch number, production date, net weight, this standard number and transportation and storage temperature of 0~40℃. 7.2 Industrial silica sol is packaged in plastic barrels or iron barrels lined with plastic barrels, with a net weight of 25, 50, 125, and 250 kg per barrel. 7.3 The stable storage period of industrial silica sol at 0-40℃ is: one year for alkaline sodium silica sol and half a year for acidic silica sol without stabilizer from the date of production. During storage, it is strictly forbidden to store with acids, alkalis, toxic substances and other corrosive substances. Prevent freezing and exposure. 7.4 Industrial silica sol is strictly prohibited from freezing and exposure during transportation. When transporting and stacking, it should be handled with care to prevent impact. Additional remarks:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Research Institute of the Ministry of Chemical Industry and Qingdao Ocean Chemical Plant, Wuhan Chemical Plant, and Wujin County Silica Sol Plant. The main drafters of this standard are Jiang Junhua, Wu Renzhi, Hu Ximei, and Shan Caiping. 1925 Density determination Wechsler balance method
5.5.1 Method summary
At 25℃, measure the buoyancy of the float in water and the sample respectively. Calculate the density of the sample based on the density of water and the buoyancy of the float in water and the sample.
5.5.2 Instruments and equipment
5.5.2.1 Wechsler balance: The graduation value of the thermometer in the float is 0.1℃. 5.5.2.2 Constant temperature water bath: The temperature can be controlled at 25±0.5℃. 5.5.3 Analysis steps
5.5.3.1 Suspend the float at the end of the balance beam with a fine platinum wire, and adjust the screws on the base so that the pointer tips of the beam and the bracket are aligned with each other. 5.5.3.2 Immerse the entire float in a glass cylinder filled with water that has been boiled and cooled to about 25℃, without introducing any bubbles. The glass cylinder is placed in a constant temperature water bath and kept at a constant temperature of 25 ± 0.5 °C. Adjust the balance weight to realign the pointer and record the reading. 5.5.3.3 Take out the float and dry it completely. At the same temperature, use the sample instead of water and perform the operation according to 5.5.3.2. 5.5.4 Expression of analysis results
The density (p) of the sample at 25°C expressed in g/cm2 is calculated according to formula (5): 190
HG/T 2521--93
Where: P1--—the reading of the weight when the float is immersed in water; 02--the reading of the weight when the float is immersed in the sample; 0.9971--the density of water at 25°C, g/cm2. × 0. 997 1
5.5.5 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.01 g/cm. 5.6 Determination of average particle size
(5)
5.6.1 Summary of method
Add silica sol sample to 200 g/L sodium chloride solution, titrate the silanol groups on the surface of silica colloidal particles with sodium hydroxide standard titration solution, and record the volume of sodium hydroxide standard titration solution consumed from pH 4.00 to 9.00. The average particle size of silica colloidal particles is calculated by the empirical formula.
5.6.2 Reagents and materials
5.6.2.1 Hydrochloric acid (GB/T622) solution: 1+10. 5.6.2.2 Sodium hydroxide (GB/T629) standard titration solution: c(NaOH) about 0.1 mol/L. 5.6.2.3 Sodium chloride (GB/T1266).
5.6.3 Instruments and equipment
5.6.3.1 Acidity meter: equipped with electromagnetic stirrer, glass electrode and saturated calomel electrode, with a graduation value of 0.02 pH unit. 5.6.4 Analysis steps
Weigh a silica sol sample containing about 1.5g of silicon dioxide to an accuracy of 0.01g and place it in a 200mL beaker. Add 100mL of water to dilute, place the beaker on the plate of the electromagnetic stirrer, and insert the glass electrode and saturated calomel electrode into the sample. Use hydrochloric acid to adjust the pH value to 3-3.5 indicated by the acidometer. Add 30g of sodium chloride and add water to about 150mL to dissolve the sodium chloride and stir evenly. Titrate with sodium hydroxide standard titration solution and record the volume of sodium hydroxide standard titration solution consumed when the pH is in the range of 4.00~~9.00. 5.6.5 Expression of analysis results
The average particle size (D) of silica sol expressed in μm is calculated according to formula (6): D
320V.c-25
Where: V——-the volume of sodium hydroxide standard titration solution consumed during titration, mL; c—-the actual concentration of sodium hydroxide standard titration solution, mol/L. 5.6.6 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result, and the absolute difference between the two parallel determination results shall not exceed 1.0nm. 6 Inspection rules
6.1 Industrial silica sol shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all industrial silica sols shipped out of the factory meet the requirements of this standard. Each batch of products shipped out of the factory shall be accompanied by a quality certificate in a certain format, including: manufacturer name, product name, category, model, production date, batch number, net weight, proof that the product quality meets the requirements of this standard and the number of this standard. 6.2 The user has the right to accept the industrial silica sol received in accordance with the provisions of this standard. The acceptance should be carried out within one month from the date of arrival of the goods.
6.3 Each batch of products shall not exceed 20t.
6.4 Determine the number of sampling units in accordance with the provisions of Article 6.6 of GB/T6678. When sampling, insert the sampler vertically into the bottom of the packaging container at a speed that the liquid level inside and outside the tube is consistent for sampling. The total sampling volume shall not be less than 500mL. Mix the collected samples and divide them into two clean and dry glass bottles and seal them. Stick labels on the bottles, indicating: manufacturer name, product name, category, model, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for three months for future reference. 191
HG/T2521—93
6.5 If any index of the inspection result does not meet the requirements of this standard, it should be re-sampled and verified from the packaging barrel with twice the amount. If the inspection result shows that only one index does not meet the requirements of this standard, the whole batch of products cannot be accepted. 6.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Interim Measures for National Product Quality Arbitration Inspection". 6.7 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 7 Marking, packaging, transportation, storage
7.1 The packaging barrel should have firm and clear markings, including: product name, manufacturer name, trademark, category, model, batch number, production date, net weight, this standard number and transportation and storage temperature of 0~40℃. 7.2 Industrial silica sol is packaged in plastic barrels or iron barrels lined with plastic barrels, with a net weight of 25, 50, 125, and 250 kg per barrel. 7.3 The stable storage period of industrial silica sol at 0-40°C is: from the date of production, the alkaline sodium type silica sol is one year, and the acidic non-stabilizer type silica sol is half a year. During storage, it is strictly forbidden to store it together with acids, alkalis, toxic substances and other easily corrosive substances. Prevent freezing and exposure. 7.4 Industrial silica sol is strictly prohibited from freezing and exposure during transportation. When transporting and stacking, it should be handled with care to prevent impact. Additional remarks:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Research Institute of the Ministry of Chemical Industry and Qingdao Ocean Chemical Plant, Wuhan Chemical Plant, and Wujin County Silica Sol Plant. The main drafters of this standard are Jiang Junhua, Wu Renzhi, Hu Ximei, and Shan Caiping. 1925 Density determination Wechsler balance method
5.5.1 Method summary
At 25℃, measure the buoyancy of the float in water and the sample respectively. Calculate the density of the sample based on the density of water and the buoyancy of the float in water and the sample.
5.5.2 Instruments and equipment
5.5.2.1 Wechsler balance: The graduation value of the thermometer in the float is 0.1℃. 5.5.2.2 Constant temperature water bath: The temperature can be controlled at 25±0.5℃. 5.5.3 Analysis steps
5.5.3.1 Suspend the float at the end of the balance beam with a fine platinum wire, and adjust the screws on the base so that the pointer tips of the beam and the bracket are aligned with each other. 5.5.3.2 Immerse the entire float in a glass cylinder filled with water that has been boiled and cooled to about 25℃, without introducing any bubbles. The glass cylinder is placed in a constant temperature water bath and kept at a constant temperature of 25 ± 0.5 °C. Adjust the balance weight to realign the pointer and record the reading. 5.5.3.3 Take out the float and dry it completely. At the same temperature, use the sample instead of water and perform the operation according to 5.5.3.2. 5.5.4 Expression of analysis results
The density (p) of the sample at 25°C expressed in g/cm2 is calculated according to formula (5): 190
HG/T 2521--93
Where: P1--—the reading of the weight when the float is immersed in water; 02--the reading of the weight when the float is immersed in the sample; 0.9971--the density of water at 25°C, g/cm2. × 0. 997 1
5.5.5 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference between the two parallel determination results shall not exceed 0.01 g/cm. 5.6 Determination of average particle size
(5)
5.6.1 Summary of method
Add silica sol sample to 200 g/L sodium chloride solution, titrate the silanol groups on the surface of silica colloidal particles with sodium hydroxide standard titration solution, and record the volume of sodium hydroxide standard titration solution consumed from pH 4.00 to 9.00. The average particle size of silica colloidal particles is calculated by the empirical formula.
5.6.2 Reagents and materials
5.6.2.1 Hydrochloric acid (GB/T622) solution: 1+10. 5.6.2.2 Sodium hydroxide (GB/T629) standard titration solution: c(NaOH) about 0.1 mol/L. 5.6.2.3 Sodium chloride (GB/T1266).
5.6.3 Instruments and equipment
5.6.3.1 Acidity meter: equipped with electromagnetic stirrer, glass electrode and saturated calomel electrode, with a graduation value of 0.02 pH unit. 5.6.4 Analysis steps
Weigh a silica sol sample containing about 1.5g of silicon dioxide to an accuracy of 0.01g and place it in a 200mL beaker. Add 100mL of water to dilute, place the beaker on the plate of the electromagnetic stirrer, and insert the glass electrode and saturated calomel electrode into the sample. Use hydrochloric acid to adjust the pH value to 3-3.5 indicated by the acidometer. Add 30g of sodium chloride and add water to about 150mL to dissolve the sodium chloride and stir evenly. Titrate with sodium hydroxide standard titration solution and record the volume of sodium hydroxide standard titration solution consumed when the pH is in the range of 4.00~~9.00. 5.6.5 Expression of analysis results
The average particle size (D) of silica sol expressed in μm is calculated according to formula (6): D
320V.c-25
Where: V——-the volume of sodium hydroxide standard titration solution consumed during titration, mL; c—-the actual concentration of sodium hydroxide standard titration solution, mol/L. 5.6.6 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result, and the absolute difference between the two parallel determination results shall not exceed 1.0nm. 6 Inspection rules
6.1 Industrial silica sol shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all industrial silica sols shipped out of the factory meet the requirements of this standard. Each batch of products shipped out of the factory shall be accompanied by a quality certificate in a certain format, including: manufacturer name, product name, category, model, production date, batch number, net weight, proof that the product quality meets the requirements of this standard and the number of this standard. 6.2 The user has the right to accept the industrial silica sol received in accordance with the provisions of this standard. The acceptance should be carried out within one month from the date of arrival of the goods.
6.3 Each batch of products shall not exceed 20t.
6.4 Determine the number of sampling units in accordance with the provisions of Article 6.6 of GB/T6678. When sampling, insert the sampler vertically into the bottom of the packaging container at a speed that the liquid level inside and outside the tube is consistent for sampling. The total sampling volume shall not be less than 500mL. Mix the collected samples and divide them into two clean and dry glass bottles and seal them. Stick labels on the bottles, indicating: manufacturer name, product name, category, model, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for three months for future reference. 191
HG/T2521—93
6.5 If any index of the inspection result does not meet the requirements of this standard, it should be re-sampled and verified from the packaging barrel with twice the amount. If the inspection result shows that only one index does not meet the requirements of this standard, the whole batch of products cannot be accepted. 6.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Interim Measures for National Product Quality Arbitration Inspection". 6.7 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 7 Marking, packaging, transportation, storage
7.1 The packaging barrel should have firm and clear markings, including: product name, manufacturer name, trademark, category, model, batch number, production date, net weight, this standard number and transportation and storage temperature of 0~40℃. 7.2 Industrial silica sol is packaged in plastic barrels or iron barrels lined with plastic barrels, with a net weight of 25, 50, 125, and 250 kg per barrel. 7.3 The stable storage period of industrial silica sol at 0-40°C is: from the date of production, the alkaline sodium type silica sol is one year, and the acidic non-stabilizer type silica sol is half a year. During storage, it is strictly forbidden to store it together with acids, alkalis, toxic substances and other easily corrosive substances. Prevent freezing and exposure. 7.4 Industrial silica sol is strictly prohibited from freezing and exposure during transportation. When transporting and stacking, it should be handled with care to prevent impact. Additional remarks:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Research Institute of the Ministry of Chemical Industry and Qingdao Ocean Chemical Plant, Wuhan Chemical Plant, and Wujin County Silica Sol Plant. The main drafters of this standard are Jiang Junhua, Wu Renzhi, Hu Ximei, and Shan Caiping. 1923 Sodium chloride (GB/T1266).
5.6.3 Instruments and equipment
5.6.3.1 Acidity meter: equipped with electromagnetic stirrer, glass electrode and saturated calomel electrode, with a graduation value of 0.02 pH unit. 5.6.4 Analysis steps
Weigh a silica sol sample containing about 1.5g of silicon dioxide to an accuracy of 0.01g and place it in a 200mL beaker. Add 100mL of water to dilute, place the beaker on the plate of the electromagnetic stirrer, and insert the glass electrode and saturated calomel electrode into the sample. Use hydrochloric acid to adjust the pH value indicated by the acidity meter to 3-3.5. Add 30g of sodium chloride, add water to about 150mL, dissolve the sodium chloride, and stir evenly. Titrate with sodium hydroxide standard titration solution, and record the volume of sodium hydroxide standard titration solution consumed when the pH is in the range of 4.00~~9.00. 5.6.5 Expression of analysis results
The average particle size (D) of silica sol expressed in μm is calculated according to formula (6): D
320V.c-25
Wherein: V——-the volume of sodium hydroxide standard titration solution consumed during titration, mL; c—-the actual concentration of sodium hydroxide standard titration solution, mol/L. 5.6.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result, and the absolute difference between the two parallel determination results shall not exceed 1.0nm. 6 Inspection rules
6.1 Industrial silica sol shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all industrial silica sols shipped out of the factory meet the requirements of this standard. Each batch of products shipped out of the factory shall be accompanied by a quality certificate in a certain format, including: manufacturer name, product name, category, model, production date, batch number, net weight, certificate that the product quality meets the requirements of this standard and the number of this standard. 6.2 The user has the right to inspect and accept the industrial silica sol received in accordance with the provisions of this standard. The inspection and acceptance should be carried out within one month from the date of arrival of the goods.
6.3 Each batch of products shall not exceed 20t.
6.4 Determine the number of sampling units in accordance with the provisions of Article 6.6 of GB/T6678. When sampling, insert the sampler vertically into the bottom of the packaging container at a speed that the liquid level inside and outside the tube is consistent. The total sampling volume is not less than 500mL. Mix the collected samples and divide them into two clean and dry glass bottles and seal them. Stick labels on the bottles, indicating: manufacturer name, product name, category, model, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for three months for reference. 191
HG/T2521—93
6.5 If any index of the inspection result does not meet the requirements of this standard, the sample should be re-tested from the packaging barrel with twice the amount. If only one index of the inspection result does not meet the requirements of this standard, the whole batch of products cannot be accepted. 6.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Interim Measures for National Product Quality Arbitration Inspection". 6.7 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 7 Marking, packaging, transportation, storage
7.1 The packaging barrel should have firm and clear markings, including: product name, manufacturer name, trademark, category, model, batch number, production date, net weight, this standard number and transportation and storage temperature of 0~40℃. 7.2 Industrial silica sol is packaged in plastic barrels or iron barrels lined with plastic barrels, with a net weight of 25, 50, 125, and 250 kg per barrel. 7.3 The stable storage period of industrial silica sol at 0-40℃ is: one year for alkaline sodium silica sol and half a year for acidic silica sol without stabilizer from the date of production. During storage, it is strictly forbidden to store with acids, alkalis, toxic substances and other corrosive substances. Prevent freezing and exposure. 7.4 Industrial silica sol is strictly prohibited from freezing and exposure during transportation. When transporting and stacking, it should be handled with care to prevent impact. Additional remarks:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Research Institute of the Ministry of Chemical Industry and Qingdao Ocean Chemical Plant, Wuhan Chemical Plant, and Wujin County Silica Sol Plant. The main drafters of this standard are Jiang Junhua, Wu Renzhi, Hu Ximei, and Shan Caiping. 1923 Sodium chloride (GB/T1266).
5.6.3 Instruments and equipment
5.6.3.1 Acidity meter: equipped with electromagnetic stirrer, glass electrode and saturated calomel electrode, with a graduation value of 0.02 pH unit. 5.6.4 Analysis steps
Weigh a silica sol sample containing about 1.5g of silicon dioxide to an accuracy of 0.01g and place it in a 200mL beaker. Add 100mL of water to dilute, place the beaker on the plate of the electromagnetic stirrer, and insert the glass electrode and saturated calomel electrode into the sample. Use hydrochloric acid to adjust the pH value indicated by the acidity meter to 3-3.5. Add 30g of sodium chloride, add water to about 150mL, dissolve the sodium chloride, and stir evenly. Titrate with sodium hydroxide standard titration solution, and record the volume of sodium hydroxide standard titration solution consumed in the pH range of 4.00~~9.00. 5.6.5 Expression of analysis results
The average particle size (D) of silica sol expressed in μm is calculated according to formula (6): D
320V.c-25
Wherein: V——-the volume of sodium hydroxide standard titration solution consumed during titration, mL; c——-the actual concentration of sodium hydroxide standard titration solution, mol/L. 5.6.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result, and the absolute difference between the two parallel determination results shall not exceed 1.0nm. 6 Inspection rules
6.1 Industrial silica sol shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all industrial silica sols shipped out of the factory meet the requirements of this standard. Each batch of products shipped out of the factory shall be accompanied by a quality certificate in a certain format, including: manufacturer name, product name, category, model, production date, batch number, net weight, certificate that the product quality meets the requirements of this standard and the number of this standard. 6.2 The user has the right to inspect and accept the industrial silica sol received in accordance with the provisions of this standard. The inspection and acceptance should be carried out within one month from the date of arrival of the goods.
6.3 Each batch of products shall not exceed 20t.
6.4 Determine the number of sampling units in accordance with the provisions of Article 6.6 of GB/T6678. When sampling, insert the sampler vertically into the bottom of the packaging container at a speed that the liquid level inside and outside the tube is consistent. The total sampling volume is not less than 500mL. Mix the collected samples and divide them into two clean and dry glass bottles and seal them. Stick labels on the bottles, indicating: manufacturer name, product name, category, model, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for three months for reference. 191
HG/T2521—93
6.5 If any index of the inspection result does not meet the requirements of this standard, the sample should be re-tested from the packaging barrel with twice the amount. If only one index of the inspection result does not meet the requirements of this standard, the whole batch of products cannot be accepted. 6.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Interim Measures for National Product Quality Arbitration Inspection". 6.7 The rounded value comparison method specified in GB1250 shall be used to determine whether the inspection results meet the standards. 7 Marking, packaging, transportation, storage
7.1 The packaging barrel should have firm and clear markings, including: product name, manufacturer name, trademark, category, model, batch number, production date, net weight, this standard number and transportation and storage temperature of 0~40℃. 7.2 Industrial silica sol is packaged in plastic barrels or iron barrels lined with plastic barrels, with a net weight of 25, 50, 125, and 250 kg per barrel. 7.3 The stable storage period of industrial silica sol at 0-40℃ is: one year for alkaline sodium silica sol and half a year for acidic silica sol without stabilizer from the date of production. During storage, it is strictly forbidden to store with acids, alkalis, toxic substances and other corrosive substances. Prevent freezing and exposure. 7.4 Industrial silica sol is strictly prohibited from freezing and exposure during transportation. When transporting and stacking, it should be handled with care to prevent impact. Additional remarks:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Research Institute of the Ministry of Chemical Industry and Qingdao Ocean Chemical Plant, Wuhan Chemical Plant, and Wujin County Silica Sol Plant. The main drafters of this standard are Jiang Junhua, Wu Renzhi, Hu Ximei, and Shan Caiping. 192
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