Some standard content:
HG/T2830-1997
This industry standard is based on domestic enterprise standards and is formulated according to actual production conditions and user requirements. It is different from existing enterprise standards as follows:
1 The categories included in my country's enterprise standards are reasonably summarized and divided into three categories according to the potassium-sodium ratio, among which Class II products are divided into two types according to the modulus.
2 Strictly control the phosphorus and sulfur indicators, and add viscosity indicators to Class III Type 2 high modulus products to meet user requirements. The determination of density, sodium oxide content, silicon dioxide content, modulus and viscosity in the test method is not equivalent to ISO methods. 3
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Tianjin Chemical Research Institute of the Ministry of Chemical Industry. The drafting units of this standard are: Tianjin Chemical Research Institute of the Ministry of Chemical Industry, Shandong Qingdao Soda Factory. The main drafters of this standard are: Yao Jinjuan, Tian Yuqi, and Zhang Yuehua. This standard is entrusted to the technical unit responsible for the standardization of inorganic salt products of the Ministry of Chemical Industry for interpretation. 719
Chemical Industry Standard of the People's Republic of China
Industrial Potassium Silicate
Sodium potassium silicate for industrial useHG/T 2830-1997
This standard specifies the requirements, sampling, test methods, marking, packaging, transportation and storage of industrial potassium and sodium silicate. This standard applies to potassium and sodium silicate series products produced with potassium carbonate, sodium carbonate and quartz sand as raw materials. The product is mainly used as an adhesive in the manufacture of welding rods, a raw material for television phosphors, a batching material in precision casting, and a waterproofing agent in geological drilling. Molecular formula: xK,0 yNa0 ·zSiO,
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. (B/T601-1988 Chemical reagents - Preparation of standard solutions for titration analysis (volume analysis) Chemical reagents
GB/T 602 ---1988
GB/T 603—1988
Preparation of standard solutions for determination of impurities (neqIS0) 6353-1:1982) Preparation of preparations and products used in chemical reagent test methods (neaISO6353-1:1982) GB/T 1250--1989
G13/T 6678.--1986
GB/T 6682
--1992
3 Classification
Expression and determination methods of limit values General rules for sampling of chemical products
Specifications and test methods for water used in analytical laboratories (eqvISO3696:1987) This standard divides industrial potassium sodium silicate into three categories according to the potassium-sodium ratio: Category 1: potassium-sodium ratio of 1:1;
Class II: potassium-sodium ratio of 2:1;
Class III: potassium-sodium ratio of 4:1.
4 Requirements
4.1 Appearance: colorless, slightly colored, transparent or translucent viscous liquid. 4.2 [Industrial potassium sodium silicate shall meet the requirements of Table 1. Table 1 Requirements
Density (20℃)/(g/cm2)
Potassium oxide (K.0) content/%
1.408~~1.436
Approved by the Ministry of Chemical Industry of the People's Republic of China on February 4, 1997720
1. 436-1. 465
1. 394~1. 422
1.465~1. 495
1997-10-01 Implementation
Sodium oxide (NaS() content/%
Silicon dioxide (SiO2) content/%
Sulfur (S) content/%
Phosphorus (P) content/%
Water insoluble matter content/%
Viscosity (20℃)/(Pa·s)
5 Sampling
5.1 Each batch of products shall not exceed 80t.
HG/T 2830--1997
Table 1 (end)
2. 50~~2. 70
2.80~3. 00
5.2 Determine the number of sampling units in accordance with the provisions of 6.6 of GB/T6678. When sampling from barrels, mix the product in the barrel, insert a plastic sampler to 3/4 of the barrel, and seal the upper end after the sample is full, and take it out. The weight of each barrel shall not be less than 100. The total sampling volume shall not be less than 1000g. When transporting by tank truck or storage tank, use a sampling bottle to take out equal amounts of samples from the upper, middle and lower parts of different depths, mix them, and the total sample volume shall not be less than 1000g. The sampled products are divided into two clean and dry plastic bottles with stoppers and sealed. Labels are attached to the bottles, indicating: manufacturer name, product name, category, model, batch number, sampling date and name of the sampler. One bottle is used as a laboratory sample, and the other bottle is kept for three months for reference. 5.3 If one of the test results does not meet the requirements of this standard, re-sampling should be carried out from twice the amount of packaging for verification. If even one of the verification results does not meet the requirements of this standard, the entire batch of products will be unqualified. 6 Test methods
6.1 All nine index items specified in this standard are type test items, among which density, potassium oxide content, sodium oxide content, silicon dioxide content, modulus, sulfur content, and viscosity are routine test items and should be tested batch by batch. Under normal production conditions, type tests should be carried out at least once every three months.
6.2 The rounded value comparison method specified in 5.2 of GB/T1250 is used to determine whether the test results meet the standards. 6.3 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 titration solutions, impurity standard solutions, preparations and products used in the test, unless otherwise specified, are prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603.
6.4 Determination of density
6.4.1 Summary of method
Read the density of the liquid from the depth at which the density meter is immersed in the liquid to be measured when it reaches a stable state. 6.4.2 Instruments and equipment
6.4.2.1 Density meter: graduation value is 0.001g/cm2; 6.4.2.2 Constant temperature water bath: temperature fluctuation range is less than 0.5℃; 6.4.2.3 Measuring cylinder: 250ml;
6.4.2.4 Thermometer: 0~50℃, graduation value is 0.1℃. 6.4.3 Analysis steps
Pour the sample to be tested into a clean and dry volume cylinder without bubbles, and place the volume cylinder in a constant temperature water bath at 20℃±0.5℃. After the temperature is constant, slowly place the clean and dry densimeter into the sample. The lower end should be more than 2 cm away from the bottom of the cylinder and cannot touch the cylinder wall. The liquid on the upper end of the densimeter exposed outside the liquid surface should not exceed the scale. After the densimeter is stable in the sample, read the scale at the lower edge of the meniscus of the densimeter, which is the density of the sample at 20℃. 6.4.4 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.002g/cm. 65 Determination of potassium oxide content
6.5.1 Summary of method
Treat the sample with hydrofluoric acid to remove silicon dioxide, then add perchloric acid to form perchlorate, wash the sodium salt with anhydrous ethanol, and determine the potassium oxide content by weight.
6.5.2 Reagents and materials
6.5.2.1 Hydrofluoric acid;
6.5.2.2 Perchloric acid;
6.5.2.3 Anhydrous ethanol;
6.5.2.4 Hydrochloric acid solution: 1+1.
6.5.3 Instruments and equipment
6.5.3.1 Platinum crucible: volume 30mL;
6.5.3.2 Glass sand: filter plate pore size is 5μm to 15μm. 6.5.4 Analysis steps
Weigh about 1g of sample (accurate to 0.0002g), place in platinum, add 10mL hot water to dissolve, add 2 drops of hydrochloric acid solution and 10ml. hydrofluoric acid in a fume hood, place on an electric furnace and heat to evaporate to about 10ml., add 8mL perchloric acid and continue evaporating until the solution is almost dry, cool to room temperature, add 20mL anhydrous ethanol to dissolve, filter with glass sand that has been dried to constant weight at 105℃~110℃ in advance, and wash the precipitate into a crucible with about 150ml anhydrous ethanol. The filtrate should be clear and transparent. If there is any confusion, filter again. Dry the crucible and the precipitate at 105℃~110℃ to constant weight.
6.5.5 Expression of analysis results
The potassium oxide (K,O) content X expressed as mass percentage is calculated according to formula (1): Xi -m=m2×0.339 9 × 100
= 33. 99 × (ml - m2)
Where: m.---mass of the added precipitate, g; m2——mass of the crucible, g;
m-mass of the sample, g;
0.3399—coefficient for converting potassium perchlorate to potassium oxide 6.5.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.08%. 6.6 Determination of sodium oxide content
6.6.1 Summary of the method
Use methyl red as the indicator and titrate the total alkalinity with a standard hydrochloric acid titration solution. Subtract the potassium oxide content calculated as sodium oxide, and the result is the sodium oxide content.
6.6.2 Reagents and materials
6.6.2.1 Standard hydrochloric acid titration solution: c(HC1) is about 0.2 mol/1.; 6.6.2.1.1 Preparation: Measure 18 ml of hydrochloric acid, inject it into 1000 ml of water, and shake it. 6.6.2.1.2 Calibration: Weigh about 0.4 standard anhydrous sodium carbonate (weighed to 0.0001 g) burned to constant weight at 270℃～300℃, dissolve it in 50 ml of water, add 10 drops of bromocresol green-methyl red indicator solution, and titrate with the prepared hydrochloric acid standard titration solution until the solution changes from green to dark red, boil for 2 minutes, and continue to titrate until the solution turns dark red again after cooling. At the same time, perform a blank test. 6.6.2.1.3 Calculation
The actual concentration c of the hydrochloric acid standard titration solution in mol/1 is calculated according to formula (2): C
WuWu: m
The mass of anhydrous sodium carbonate, g;
(V.-V.)× 0. 052 99
The volume of the hydrochloric acid standard titration solution consumed in the titration, mL; Va
-The volume of the hydrochloric acid standard titration solution consumed in the blank test, mL; 0.05299
The mass of anhydrous sodium carbonate in grams equivalent to 1.00 mL of the hydrochloric acid standard titration solution (Cc(HC1)=1.000mol/L).
6.6.2.2 Methyl red indicator solution: 1 g/L.
6.6.3 Analysis steps
Weigh about 1g of sample (accurate to 0.0002g), transfer to a 250mL conical flask, dissolve with 50mL of water, add 10 drops of methyl red indicator solution, and titrate with hydrochloric acid standard titration solution until the solution changes from yellow to slightly red, which is the end point. This solution is test solution A, and this solution is reserved for the determination of silicon dioxide content.
6.6.4 Expression of analysis results
The sodium oxide (Na2O) content X2 expressed as mass percentage is calculated according to formula (3): X: =Vc×0.03099×100 0.659 6 ×Xm
Vc× 3.099
90.6596×X
Wherein:
actual concentration of hydrochloric acid standard titration solution, mol/L.; - volume of hydrochloric acid standard titration solution consumed in titration, mL; mass of sample, g;
potassium oxide content expressed as mass percentage measured according to 6.5; 0.6596.---coefficient for converting potassium oxide to sodium oxide; 0.030 99
（3）
The mass of sodium oxide in grams equivalent to 1.00mL of standard hydrochloric acid titration solution [c(HC1) 1.000mol/L].
6.6.5 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.08%. 6.7 Determination of silicon dioxide content
6.7.1 Summary of method
Add excess sodium fluoride to the solution after the sodium oxide content has been determined to generate a quantitative amount of sodium hydroxide. Add excess hydrochloric acid solution and then back-titrate with standard sodium hydroxide titration solution. 6.7.2 Reagents and materials
6.7.2.1 Sodium fluoride;
6.7.2.2 Standard hydrochloric acid titration solution: c(HCl) about 0.5 mol/L; 6.7.2.3 Standard sodium hydroxide titration solution: c(NaOH) about 0.1 mol/L; 6.7.2.4 Methyl red indicator solution: 1 g/L.
6.7.3 Analysis steps
Add 3.00 g ± 0.01 g sodium fluoride to the test solution A (6.6.3) after the sodium oxide content is determined, and shake it to dissolve. At this time, the solution turns yellow again. Immediately titrate with standard hydrochloric acid titration solution until the slightly reddish color remains unchanged, and then add 2 ml to 3 mL in excess. Accurately record the total volume of the standard hydrochloric acid titration solution. Then titrate with standard sodium hydroxide titration solution until the yellow end point. At the same time, do a short self-test. In a 250mL conical flask, add about 50mL of water, 10 drops of methyl red indicator solution, and 3.00g ± 0.01g723
HG/T 2830-1997
sodium fluoride. Immediately titrate with hydrochloric acid standard titration solution until the reddish color remains unchanged, then add 2mL~~3mL in excess, and accurately record the total volume of hydrochloric acid standard titration solution. Then titrate with sodium nitride standard titration solution until the yellow color is the end point. 6.7.4 Expression of analysis resultsbzxZ.net
Silicon dioxide (SiO2) content X expressed as mass percentage: Calculate according to formula (4): X = E(cVi=V)-(eVz-αV)] × 0. 015 02,m
[(ciVi 二c2 V2) -- (ciV, -- c2V,)] × 1. 502m
Wherein: -
actual concentration of hydrochloric acid standard titration solution, mol/1.; actual concentration of sodium hydroxide standard titration solution, mol/L; Vi-
volume of hydrochloric acid standard titration solution consumed in titration, mL; V2-volume of sodium hydroxide standard titration solution consumed in titration, mL; V:-volume of hydrochloric acid standard titration solution consumed in blank test, mL; V.-volume of sodium hydroxide standard titration solution consumed in blank test, mLm-mass of sample for determination of sodium oxide content in Article 6.6, g; X100
(4)
0.01502-mass of silicon dioxide in grams equivalent to 1.00mL hydrochloric acid standard titration solution Cc (HC1) = 1.000mol/L.
6.7.5 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference between the parallel determination results shall not exceed 0.2%. 6.8 Calculation of modulus
The modulus (M) is calculated according to formula (5):
M= 0.659 6xx +x×1. 032
Wherein: X——the content of potassium oxide (KzO) expressed in mass percentage measured according to 6.5; Xz—the content of sodium oxide (Na2O) expressed in mass percentage measured according to 6.6; X—the content of silicon dioxide (SiO2) expressed in mass percentage measured according to 6.7; 0.6596—the coefficient for converting potassium oxide to sodium oxide; 1.032—the ratio of the molecular weight of sodium oxide to the molecular weight of silicon dioxide. 6.9 Determination of sulfur content
6.9.1 Summary of the method
In a slightly acidic medium, sulfate ions are precipitated with barium chloride and turbidometrically compared with a standard turbidimetric solution of barium sulfate. 6.9.2 Reagents and materials
6.9.2.1 Hydrochloric acid solution: 1+5,
6.9.2.2 Barium chloride solution: 100g/L;
6.9.2.3 Sulfur standard solution: 1mL solution contains 0.1mgS; 6.9.2.4 Phenolphthalein indicator solution: 10g/L.
6.9.3 Analysis steps
Weigh about 0.5g of sample (accurate to 0.01g), place it in a 50mL colorimetric tube, and add 10mL of water to dissolve. Add 1 drop of phenolphthalein indicator solution, neutralize with hydrochloric acid solution, then add 5mL of hydrochloric acid solution and 2mL of barium chloride solution, add water to the scale, shake well, place in a 40℃～50℃ water bath, and compare after 10 minutes. Its turbidity shall not be greater than that of the standard turbidity solution. The standard turbidity solution is 2.5 mL of sulfur standard solution taken with a pipette and placed in a 50 mL colorimetric tube. It is treated in the same way as the sample. 6.10 Determination of phosphorus content
6.10.1 Method summary
Treat the sample with hydrofluoric acid to remove silicon dioxide, add phosphorus reagent A and phosphorus reagent B to develop color with the phosphorus in the sample, and compare it with the standard colorimetric solution 724
.
6.10.2 Reagents and materials
6. 10. 2. 1
6. 10. 2. 2
6. 10. 2.3
Hydrofluoric acid;
Sulfuric acid;
Sulfuric acid solution: 1+6;
Sodium hydroxide solution: 20g/L;
Phosphorus reagent A;
6.10.2.6Phosphorus reagent B;
6. 10. 2. 7
HG/T 2830—1997
Phosphorus standard solution: 1 ml. The solution contains 0.1 mg P; Saturated 2,4-dinitrophenol indicator solution.
6. 10. 2. 8
6.10.3 Instruments and equipment
Platinum: volume 30ml;
6.10.4 Analysis steps
Weigh about 0.5g sample (accurate to 0.01g), place in a 30mL platinum crucible, add 15mL hydrofluoric acid and 8-10 drops of sulfuric acid, heat on low heat, and remove and cool when evaporation is almost dry and thick smoke of sulfuric acid is emitted. Heat and dissolve the residue with 10mL~~20mL water several times and transfer all to a 100mL volumetric flask.
Use a pipette to transfer 20mL of the test solution into a 50mL colorimetric tube, add 1-2 drops of saturated 2,4-dinitrophenol indicator solution, neutralize with sodium hydroxide solution, add water to 25mL, add 4mL sulfuric acid solution, 1mL phosphorus reagent A and phosphorus reagent B, and shake well. Place in a 60℃ water bath and keep warm for 15 minutes. The color should not be darker than the standard colorimetric solution. The standard colorimetric solution is to transfer 0.5mL of phosphorus standard solution into a 50mL colorimetric tube and treat it in the same way as the sample. 6.11 Determination of water-insoluble content
6.11.1 Reagents and materials
6.11.1.1 Phenolic acid indicator solution: 10g/L.
6.11.1.2 Acid-washed asbestos:
Take an appropriate amount of acid-washed asbestos, soak it in 1+3 hydrochloric acid solution, boil it for 20 minutes, filter it with a Buchner funnel and wash it with water until it is neutral. Then soak it in 50g/l sodium hydroxide solution and boil it for 20 minutes, filter it with a Buchner funnel and wash it with water until it is neutral (check with phenolic acid indicator solution). Mix it with water to make a thin paste and set aside.
6.11.2 Apparatus and equipment
Gooch crucible: capacity 30mL.
Place the Gooch crucible on the filtration bottle, evenly spread about 3mm thick acid-washed asbestos on the upper and lower sides of the sieve plate, and wash with water at 60℃~～80℃ until the filtrate contains no asbestos wool. Remove the crucible and dry it at 105℃～110℃, weigh it after cooling. Wash it with hot water, dry it at 105℃～110℃, weigh it after cooling. Repeat this process until the crucible has a constant weight. 6.11.3 Analysis steps
Weigh about 5g of the sample (accurate to 0.01g), place it in a 400mL beaker, dissolve it with about 300mL of water at 60℃~80℃, filter it with a Gooch crucible that has been dried to constant weight at 105℃~110℃, and wash the residue with water at 60℃~80℃ until there is no alkaline reaction (check with phenolic acid indicator solution). The crucible and the residue are dried at 105℃～110℃ to constant weight. 6.11.4 Expression of analysis results
The water-insoluble content (X,) expressed as mass percentage is calculated according to formula (6): X = m2 = m×100
The mass of the Gooch crucible, g;
Where: mi\
The mass of the water-insoluble matter and the Gooch crucible, g;
The mass of the sample, g.
6.11.5 Allowable difference
HG/T 2830--1997
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02%. 6.12 Determination of viscosity
6.12.1 Summary of method
The resistance of potassium sodium silicate to relative motion with the rotor is measured to express the viscosity of potassium sodium silicate. 6.12.2 Instruments and equipment
6.12.2.1 Constant temperature water bath: temperature fluctuation range is less than 0.5℃; 6.12.2.2 Thermometer: graduation value is 0.1℃; 6.12.2.3 Rotational viscometer: measurement error is less than ±0.5%; 6.12.2.4 Container: diameter is 6cm~~7cm, height is not less than 11cm; 6.12.2.5 Stopwatch: accuracy is 0.2s.
6.12.3 Analysis steps
According to the viscosity of the sample, select the appropriate rotor and speed from the range table of the instrument used. 6. 12. 3. 1
Keep the sample and rotor at a constant temperature of 20℃±0.5℃, and keep the sample temperature uniform. Read the indicated value when the rotor rotates for 60s±2s.
6.12.4 Expression of analysis results
The absolute viscosity of the sample at 20°C expressed in Pa·s (n) is calculated according to formula (7): n= Kα
Where: K—conversion coefficient found in the coefficient table of the instrument used; —the reading indicated by the pointer.
6.12.5 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.1 Pa·s. 7 Marking, packaging, transportation and storage.
7.1 The packaging of industrial potassium sodium silicate shall be firmly and clearly marked, including: manufacturer name, factory address, product name, trademark, category, model, net weight, batch number or production date and the number of this standard. 7.2 Each batch of industrial potassium sodium silicate leaving the factory shall be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, trademark, category, model, net weight, batch number or production date, proof that product quality complies with this standard and this standard number. 7.3 Industrial potassium sodium silicate is packaged in iron drums. The net weight of each drum is 150kg, 250kg or 300kg. It can also be transported by tank trucks. 7.4 Industrial potassium sodium silicate packaging drums are tightened with lids with rubber sealing gaskets. 7.5 Industrial potassium sodium silicate should be loaded and unloaded gently during transportation to prevent damage to the container. 7.6 Industrial potassium sodium silicate should be stored in a dry place without acid and alkali vapor, and should not be piled in the open air. It should be protected from rain and freezing in cold seasons. 726) is calculated according to formula (6): X = m2 = m × 100
mass of Gooch crucible, g;
where: mi\
mass of water-insoluble matter and Gooch crucible, g;
mass of sample, g.
6.11.5 Allowable difference
HG/T 2830--1997
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02%. 6.12 Determination of viscosity
6.12.1 Summary of method
The resistance of potassium sodium silicate to relative motion with the rotor is measured to express the viscosity of potassium sodium silicate. 6.12.2 Instruments and equipment
6.12.2.1 Constant temperature water bath: temperature fluctuation range is less than 0.5℃; 6.12.2.2 Thermometer: graduation value is 0.1℃; 6.12.2.3 Rotational viscometer: measurement error is less than ±0.5%; 6.12.2.4 Container: diameter is 6cm~~7cm, height is not less than 11cm; 6.12.2.5 Stopwatch: accuracy is 0.2s.
6.12.3 Analysis steps
According to the viscosity of the sample, select the appropriate rotor and speed from the range table of the instrument used. 6. 12. 3. 1
Keep the sample and rotor at a constant temperature of 20℃±0.5℃, and keep the sample temperature uniform. Read the indicated value when the rotor rotates for 60s±2s.
6.12.4 Expression of analysis results
The absolute viscosity of the sample at 20°C expressed in Pa·s (n) is calculated according to formula (7): n= Kα
Where: K—conversion coefficient found in the coefficient table of the instrument used; —the reading indicated by the pointer.
6.12.5 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.1 Pa·s. 7 Marking, packaging, transportation and storage.
7.1 The packaging of industrial potassium sodium silicate shall be firmly and clearly marked, including: manufacturer name, factory address, product name, trademark, category, model, net weight, batch number or production date and the number of this standard. 7.2 Each batch of industrial potassium sodium silicate leaving the factory shall be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, trademark, category, model, net weight, batch number or production date, proof that product quality complies with this standard and this standard number. 7.3 Industrial potassium sodium silicate is packaged in iron drums. The net weight of each drum is 150kg, 250kg or 300kg. It can also be transported by tank trucks. 7.4 Industrial potassium sodium silicate packaging drums are tightened with lids with rubber sealing gaskets. 7.5 Industrial potassium sodium silicate should be loaded and unloaded gently during transportation to prevent damage to the container. 7.6 Industrial potassium sodium silicate should be stored in a dry place without acid and alkali vapor, and should not be piled in the open air. It should be protected from rain and freezing in cold seasons. 726) is calculated according to formula (6): X = m2 = m × 100
mass of Gooch crucible, g;
where: mi\
mass of water-insoluble matter and Gooch crucible, g;
mass of sample, g.
6.11.5 Allowable difference
HG/T 2830--1997
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02%. 6.12 Determination of viscosity
6.12.1 Summary of method
The resistance of potassium sodium silicate to relative motion with the rotor is measured to express the viscosity of potassium sodium silicate. 6.12.2 Instruments and equipment
6.12.2.1 Constant temperature water bath: temperature fluctuation range is less than 0.5℃; 6.12.2.2 Thermometer: graduation value is 0.1℃; 6.12.2.3 Rotational viscometer: measurement error is less than ±0.5%; 6.12.2.4 Container: diameter is 6cm~~7cm, height is not less than 11cm; 6.12.2.5 Stopwatch: accuracy is 0.2s.
6.12.3 Analysis steps
According to the viscosity of the sample, select the appropriate rotor and speed from the range table of the instrument used. 6. 12. 3. 1
Keep the sample and rotor at a constant temperature of 20℃±0.5℃, and keep the sample temperature uniform. Read the indicated value when the rotor rotates for 60s±2s.
6.12.4 Expression of analysis results
The absolute viscosity of the sample at 20°C expressed in Pa·s (n) is calculated according to formula (7): n= Kα
Where: K—conversion coefficient found in the coefficient table of the instrument used; —the reading indicated by the pointer.
6.12.5 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.1 Pa·s. 7 Marking, packaging, transportation and storage.
7.1 The packaging of industrial potassium sodium silicate shall be firmly and clearly marked, including: manufacturer name, factory address, product name, trademark, category, model, net weight, batch number or production date and the number of this standard. 7.2 Each batch of industrial potassium sodium silicate leaving the factory shall be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, trademark, category, model, net weight, batch number or production date, proof that product quality complies with this standard and this standard number. 7.3 Industrial potassium sodium silicate is packaged in iron drums. The net weight of each drum is 150kg, 250kg or 300kg. It can also be transported by tank trucks. 7.4 Industrial potassium sodium silicate packaging drums are tightened with lids with rubber sealing gaskets. 7.5 Industrial potassium sodium silicate should be loaded and unloaded gently during transportation to prevent damage to the container. 7.6 Industrial potassium sodium silicate should be stored in a dry place without acid and alkali vapor, and should not be piled in the open air. It should be protected from rain and freezing in cold seasons. 726
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