Some standard content:
HG/T 2838
This standard is proposed after the revision of GB/T10534-1989. The main differences from the previous version are: appropriate modifications have been made on the basis of the superior products of the previous version as the first-class products of this standard; appropriate modifications have been made on the basis of the first-class products of the previous version as the qualified products of this standard
2 According to the opinions of manufacturers and users, the two indicators of iron and ammonium have been cancelled. From the date of entry into force of this standard, GB/T10534-1989 shall be invalid. 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. Drafting units of this standard: Tianjin Chemical Research Institute of the Ministry of Chemical Industry, Yantai Fourth Chemical Plant. The main drafters of this standard: Huang Jia, Lin Hongyuan, Li Peng, Shao Hongqian. This standard was first issued in 1989 and revised for the first time in 1996. 156
ICS 13.060.99;71.100.40
Registration No. 149—1997
Chemical Industry Standard of the People's Republic of China
Water treatment chemicals
Sodium polyacrylate
Water treatment chemicals-Sodium polyacrylate1Scope
HG/T 2838--. 1997
This standard specifies the technical requirements, sampling, test methods, marking, packaging, transportation and storage of water treatment chemicals sodium polyacrylate. This product is mainly used as a scale inhibitor and dispersant in industrial water treatment. Molecular formula: (C,H,O,Na)
Cited 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 are subject to revision, and parties using this standard should explore the possibility of using the latest version of the following standards. GB 190--1990
GB 191-. 1990
Marking of dangerous goods packaging
Pictographic marking of packaging, storage and transportation
GB/T 601-: 1988
GB/T 603.---1988
GB/T 1250---1989
GB/T 6678—1986
GB,T 6682-1992
3 Technical requirements
Preparation of standard solutions for titration analysis (volumetric analysis) of chemical reagents Preparation of preparations and products used in test methods of chemical reagents (negISO6353-1:1982) Methods for expressing and determining limit values General rules for sampling of chemical products
Specifications and test methods for water used in analytical laboratories 3.1 Appearance: colorless or light yellow transparent liquid. Sodium polyacrylate, a water treatment agent, shall meet the requirements of Table 1. 3.2
Solid content, %
Free monomer (in terms of (H, diCH-COOH) content, %pH value
Density (20), g/cm
Limiting viscosity (30 ().dl./g
4 Sampling
4.1 Determine the number of sampling units in accordance with the provisions of Article 6.6 of GB/T6678. Approved by the Ministry of Chemical Industry of the People's Republic of China on February 4, 1997
6. 5 ~7. 5
0.0600.085
Qualified products
6. 0~~8. 0
0.055~~0. 10
1997-10-01 implementation
HG/T 2838---1997
4.2 Stir thoroughly before sampling. Use a glass tube or polyethylene plastic tube to insert into the bucket at two-thirds of the depth to collect samples. The total volume should not be less than 1000ml. Mix thoroughly, divide into two clean, dry bottles with ground stoppers, and seal. Label the bottles with: manufacturer name, product name, batch number, sampling date and name of the sampler. One bottle is for inspection, and the other bottle is kept for three months for future reference. 4.3 If any of the test results do not meet the requirements of this standard, When the test result shows that…·items of the test result do not meet the requirements of this standard, the whole batch of products cannot be accepted. 5 Test method
The reagents and water used in this standard, unless otherwise specified, refer to analytical reagents and grade 3 water specified in GB/T6682. The standard titration solutions, preparations and products used in the test, unless otherwise specified, are prepared in accordance with the provisions of GB/T601 and GB/T603.||tt| |The rounded value comparison method specified in GB/T1250 is used to determine whether the test results meet the requirements. 5.1 Determination of solid content
5.1.1 Method summary
At a constant temperature, place the sample in an electric drying oven and dry it to constant weight. 5.1.2 Instruments and equipment
-General laboratory instruments and
5.1.2.1 Flat weighing bottle: d60mmX30mm. 5.1.3 Analysis steps
Use a flat weighing bottle pre-tested at 12 0C±2C dried to constant weight weighing bottle, weigh about 1g sample (accurate to 0.0002g), shake carefully to make the sample flow naturally, and form a uniform film on the bottom of the bottle. Then put it in the electric heating drying box, start heating from room temperature, and dry it at 120C±2C for 4l. Take it out and put it in the dryer to cool to room temperature, and then weigh it. 5.1.4 Expression of analysis results
The solid content (X,) expressed as mass percentage is calculated according to formula (1): mz-m×100 ·
Wu: m
Weighing bottle mass, g;
+The mass of the sample and the weighing bottle after drying, g; The mass of the sample, g.
5.1.5 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference between the results of two parallel determinations shall not exceed 0.3%. 5.2 Determination of free monomer content
5.2.1 Summary of the method
Under acidic conditions, the double bonds of the free monomers in the sample react with bromine. Excess bromine reacts with potassium iodide to precipitate iodine. Using starch as an indicator, the precipitated iodine is titrated with sodium thiosulfate standard titration solution under neutral or weakly acidic conditions. 5.2.2 Reagents and materials
5.2.2.1 Hydrochloric acid: 1+1 solution.
5.2.2.2 Iodide: 100g/1. Solution.
5.2.2.3 Bromine: c(1/2Br2) about 0.1mol/1. Solution. 5.2.2.4 Sodium thiosulfate: c(NazS20:) about 0.1mol/1 standard titration solution. 5.2.2.5 Soluble starch: 10g/L. Solution. 5.2.3 Analysis steps
Weigh about 4g of sample (accurate to 0.001g) and place it in a 500ml iodine volume flask with 20ml of water added in advance. Add 20.00ml of bromine solution and 5ml of hydrochloric acid solution, shake the spoon, and place it in a dark place for 20min. Take it out, add 15ml of potassium iodide solution and shake it well, and place it in a dark place for 1min~158
HG/T2838—1997
2min. Take it out, add 150ml of water, and immediately titrate it with sodium thiosulfate standard titration solution until it turns light yellow, add 1ml.~2ml of starch indicator solution, and continue titrating until the blue disappears, which is the end point. Perform a blank test at the same time.
5.2.4 Expression of analysis results
The free monomer (in terms of CH4-CH4-COOH) content (X4) expressed as mass percentage is calculated according to formula (2): (V4-V5)×0.03603×100
(Ve-V)cX3. 603
Wherein: v.—…the volume of sodium thiosulfate standard titration solution consumed in the blank test, mL; V—the volume of sodium thiosulfate standard titration solution consumed in the titration test solution, mL; C\—the actual concentration of the sodium thiosulfate standard titration solution, mol/L; m—the mass of the sample, g;
0.036 (3---the mass of acrylic acid in grams equivalent to 1.00mL of sodium thiosulfate solution Cc (NazSO) = 1.000mol/L.
5.2.5 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The difference between the two parallel determination results is 1.00%. The absolute difference is no more than 0.03% for first-class products and no more than 0.06% for qualified products.
5.3 Determination of pH value
5.3.1 Instruments and equipment
5.3.1.1 Acidity meter: accuracy 0.02 pH unit, equipped with saturated calomel reference electrode, glass measuring electrode or composite electrode. 5.3.2 Analysis steps
Pour the test solution into a beaker, place it on an electromagnetic stirrer, immerse the electrode in the solution, and start stirring. Read the pH value on the positioned acidity meter.
5.4 Determination of density
5.4.1 Instruments and equipment
5.4.1.1 Density meter: graduation value is 0.001g/cm2. 5.4.1.2 Constant temperature water bath: temperature is controlled at 20°C ± 0.1°C. 5.4.1.3 Glass measuring cylinder: 500mL.
5.4.1.4 Thermometer: 0～50°C, graduation value is 0.1°C. 5.4.2 Analysis steps
Pour the sample into a clean and dry measuring cylinder without bubbles, and place the measuring cylinder in a constant temperature water bath at 20°C. After the temperature is constant, slowly put the clean and dry density meter into the sample, and its lower end should be more than 2cm away from the bottom of the cylinder and cannot touch the cylinder wall. The upper end of the density meter exposed outside the liquid surface should not be stained by more than 2～3 graduations of liquid. After the density meter is stable in the sample, read the scale of the lower edge of the meniscus of the density meter (except for the density meter marked with the scale of reading the upper edge of the meniscus), which is the density of the 20°C sample. 5.5 Determination of limiting viscosity
5.5.1 Method summary
Sodium polyacrylate is diluted in 101g/L sodium thiocyanate solution and its limiting viscosity is determined by Ubbelohde viscometer. 5.5.2 Reagents and materials
5.5.2.1 Sodium hydroxide: 80g/L solution. 5.5.2.2 Sodium thiocyanate: 101g/L solution. 5.5.3 Instruments and equipment
--General laboratory instruments and
HG/T2838-1997
5.5.3.1 Ubbelohde viscometer (as shown in Figure 1): capillary inner diameter 0.50mm (±2%). At 30C±0.1C, the time for distilled water to flow through the timing marks E and F is more than 100$.
A--lower ball, outer diameter 26mm, B-floating level ball, C-counter ball, volume 3.0mL (±5%), D-upper ball: F-timing mark GH-filling mark mounting tube, outer diameter 11mm, M-lower outlet pipe, outer diameter 6mm, N-upper outlet pipe, outer diameter? mm, P--connecting tube, inner diameter 6.0mm±5%), R-working capillary, inner diameter 0.50mm±2%) Figure 1 Ubbelohde viscometer
5.5.3.2 Constant temperature water bath.
5.5.3.3 Thermometer: 0~50C, graduation value 0.1℃. 5.5.3.4 Stopwatch: minimum graduation value 0.1s.
5.5.3.5 Culture md85mm.
5.5.3.6 Resin filter full bucket: G3.40ml. 5.5.4 Analysis steps bzxZ.net
HG/T 2838-1997
5.5.4.1 Determination of the outflow time of sodium thiocyanate solution Place a clean and dry Islet viscometer vertically in a constant temperature water bath at 30°C ± 0.3°C, add sodium thiocyanate solution through a G3 acid-resistant filter funnel until the viscometer is filled to the G and H marks, and keep the temperature constant for 10min~15min. Use an ear wash bulb to pour the sodium thiocyanate solution into the C ball mark E to 1, and use a stopwatch to measure the time for the sodium thiocyanate solution to flow through the timing marks E and F. Measure three times in a row, and the error should not exceed 0.25. Take the average value t (s).
5.5.4.2 Preparation of test solution
Weigh 3g4 of the sample and place it in culture III. Use sodium hydroxide solution to carefully adjust the pH value of the test solution to 9.0 (check with precision pH test paper). Then put it in the drying box with electric heating, start heating from room temperature, dry at 120℃±2℃ for 4h, cool to room temperature in the desiccator, and prepare the dry sample. Weigh 0.25g~0.30g of dry sample (accurate to 0.0002g), put it in a 50ml beaker, dissolve it with about 20ml sodium thiocyanate solution, transfer all to a 50mL volumetric flask, dilute to the scale with sodium thiocyanate solution, shake well 5.5.4.3 Determination of
Special test solution is added to the clean and dry Ubbelohde viscometer through a 63 acid-resistant filter funnel until it is filled between the G and H marks, and keep the temperature constant for 10min~~15min. Use an ear wash bulb to absorb the test solution above the C ball mark E, and use a stopwatch to measure the time for the test solution to flow through the timing marks E and F. Measure three times in a row, and the error does not exceed 0.2 $, and take the average value t(s). 5.5.5 Expression of analysis results
The limiting viscosity number (X3) of sodium polyacrylate expressed as l1./g is calculated according to formula (3): N2(pln.)
where: - specific viscosity, =
relative viscosity 5 -
concentration of test solution·gd.
tThe time for sodium thiocyanate solution to flow through the time markings E and F of the viscometer,, - the time for the test solution to flow through the time markings E and F of the viscometer. 5.5.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference between the two parallel traceability results shall not exceed 0.004dl/g. 6. Marking, packaging, transportation, purchase and storage
6.1 The packaging barrels of water treatment agent sodium polyacrylate shall be painted with solid markings, including: manufacturer name, product name, grade, trademark, batch number or production date, net weight, factory certificate and "mark 20 corrosive products" specified in GB190 and mark 3 upwards specified in GB191. 6.2 Each batch of water treatment agent sodium polyacrylate shall be accompanied by Quality certificate. Contents include: manufacturer name, product name, grade, trademark, batch number or production date, net weight, product quality certification and this standard number. 6.3 Water treatment agent sodium polyacrylate is packaged in polyethylene plastic barrels, with a net weight of 25kg per barrel; or in iron plastic barrels, with a net weight of 200kg per barrel.
6.4 During transportation, it should be prevented from being exposed to the sun and stored in a ventilated and dry warehouse. 6.5 The storage period of water treatment agent sodium polyacrylate is ten months. 1610002g), put it in a 50ml beaker, dissolve it with about 20ml sodium thiocyanate solution, transfer it all to a 50mL volumetric flask, dilute it to the scale with sodium thiocyanate solution, shake it well. 5.5.4.3 Determination of
Special test solution is added to a clean and dry Ubbelohde viscometer through a 63 acid-resistant filter funnel until it is filled between the G and H marks, and the temperature is kept constant for 10min~~15min. Use an ear wash bulb to suck the test solution above the C ball mark E, and use a stopwatch to measure the time for the test solution to flow through the timing marks E and F. Measure three times in a row, and the error does not exceed 0.2 $, and take the average value t(s). 5.5.5 Expression of analysis results
The limiting viscosity number (X3) of sodium polyacrylate expressed as l1./g is calculated according to formula (3): N2(pln.)
where: - specific viscosity, =
relative viscosity 5 -
concentration of test solution·gd.
tThe time for sodium thiocyanate solution to flow through the time markings E and F of the viscometer,, - the time for the test solution to flow through the time markings E and F of the viscometer. 5.5.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference between the two parallel traceability results shall not exceed 0.004dl/g. 6. Marking, packaging, transportation, purchase and storage
6.1 The packaging barrels of water treatment agent sodium polyacrylate shall be painted with solid markings, including: manufacturer name, product name, grade, trademark, batch number or production date, net weight, factory certificate and "mark 20 corrosive products" specified in GB190 and mark 3 upwards specified in GB191. 6.2 Each batch of water treatment agent sodium polyacrylate shall be accompanied by Quality certificate. Contents include: manufacturer name, product name, grade, trademark, batch number or production date, net weight, product quality certification and this standard number. 6.3 Water treatment agent sodium polyacrylate is packaged in polyethylene plastic barrels, with a net weight of 25kg per barrel; or in iron plastic barrels, with a net weight of 200kg per barrel.
6.4 During transportation, it should be prevented from being exposed to the sun and stored in a ventilated and dry warehouse. 6.5 The storage period of water treatment agent sodium polyacrylate is ten months. 1610002g), put it in a 50ml beaker, dissolve it with about 20ml sodium thiocyanate solution, transfer it all to a 50mL volumetric flask, dilute it to the scale with sodium thiocyanate solution, shake it well. 5.5.4.3 Determination of
Special test solution is added to a clean and dry Ubbelohde viscometer through a 63 acid-resistant filter funnel until it is filled between the G and H marks, and the temperature is kept constant for 10min~~15min. Use an ear wash bulb to suck the test solution above the C ball mark E, and use a stopwatch to measure the time for the test solution to flow through the timing marks E and F. Measure three times in a row, and the error does not exceed 0.2 $, and take the average value t(s). 5.5.5 Expression of analysis results
The limiting viscosity number (X3) of sodium polyacrylate expressed as l1./g is calculated according to formula (3): N2(pln.)
where: - specific viscosity, =
relative viscosity 5 -
concentration of test solution·gd.
tThe time for sodium thiocyanate solution to flow through the time markings E and F of the viscometer,, - the time for the test solution to flow through the time markings E and F of the viscometer. 5.5.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference between the two parallel traceability results shall not exceed 0.004dl/g. 6. Marking, packaging, transportation, purchase and storage
6.1 The packaging barrels of water treatment agent sodium polyacrylate shall be painted with solid markings, including: manufacturer name, product name, grade, trademark, batch number or production date, net weight, factory certificate and "mark 20 corrosive products" specified in GB190 and mark 3 upwards specified in GB191. 6.2 Each batch of water treatment agent sodium polyacrylate shall be accompanied by Quality certificate. Contents include: manufacturer name, product name, grade, trademark, batch number or production date, net weight, product quality certification and this standard number. 6.3 Water treatment agent sodium polyacrylate is packaged in polyethylene plastic barrels, with a net weight of 25kg per barrel; or in iron plastic barrels, with a net weight of 200kg per barrel.
6.4 During transportation, it should be prevented from being exposed to the sun and stored in a ventilated and dry warehouse. 6.5 The storage period of water treatment agent sodium polyacrylate is ten months. 161
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