Some standard content:
National Standard of the People's Republic of China
Sodium lauryl sulfate
Sodium lauryl sulfate
Subject content and scope of application
GB/T15963--1995
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of sodium lauryl sulfate.
This standard applies to lauryl alcohol obtained by hydrogenation of coconut oil, sodium lauryl sulfate obtained by sulfation and neutralization with sulfur trioxide or chlorosulfonic acid, including powder (needle) and liquid products. 2 Reference standards
GB601 Preparation of standard solution for titration analysis (volume analysis) of chemical reagents GB/T3143 Color determination of liquid chemical products (Hazen unit - platinum-cobalt color number) GB6368 Determination of pH value of aqueous surfactant solution - Potentiometric method GB8170 Numerical rounding rules
GB/T11989 Determination of content of petroleum ether dissolved matter in anionic surfactants GB/T13173.1 Determination of sample separation method for detergents GB/T13173.2 Determination of total active matter content in detergents GB/T13176.1 Determination of whiteness of washing powder
3 Product classification
Sodium dodecyl sulfate is divided into powder (needle) products and liquid products. Powder (needle) products are further divided into superior, first-class and second-class products.
Structural formula:
CH,(CHz),OSO,Na(n=11,main component) 4 Technical requirements
The physical and chemical properties of sodium dodecyl sulfate shall conform to the requirements of Table 1. Table 1
Active matter content, %
Approved by the State Bureau of Technical Supervision on December 26, 1995Superior product
Powder (needle) product
First-class product
Liquid product
Second-class product
White or light yellow powder (needle), non-agglomerated≥90
Light yellow transparent liquid
Implemented on December 1, 1996
Soluble petroleum aldehyde content, %
Inorganic salt content
(NaCI+Na2SO,), %
Water content, %
pH value (1% solution)
Whiteness (Wc)
Color (Hazen)
Test method
GB/T 15963-1995
Continued Table 1
Powder (needle) products
Superior products
First-class products
Second-class products
Unless otherwise specified, analytical reagents and distilled water or water of equivalent purity should be used in the analysis. 5.1 Preparation of samples
Laboratory samples of sodium dodecyl sulfate should be prepared and stored in accordance with the provisions of GB/T13173.1. 5.2 Determination of pH value
The pH value of a 1% solution of the sample should be determined in accordance with the provisions of GB6368. Liquid products
7. 5-~ 9. 5
Note: If the pH value of the analysis result is lower than 7.0, no further analysis is required for the sample, because in this case, the sample and the product it represents will be unstable.
5.3 Determination of active matter content
The mass percentage of active matter in sodium dodecyl sulfate (X,) is calculated by the difference reduction method according to formula (1). X, = 100 - X, - X, - X, - X4 Where: X. - ... The average value of the parallel determination results is rounded off to the nearest unit as the result. 5.4 Determination of petroleum ether soluble content
·(1)
Petroleum ether solubles include unsulfated fatty alcohols and non-sulfated substances as well as sulfur-containing compounds that do not dissociate in aqueous solution. The petroleum ether soluble content (X,) is determined in accordance with the provisions of GB/T11989 and expressed as mass percentage. The difference between parallel determination results should not exceed 0.2%.
5.5 Determination of sodium sulfate content
5.5.1 Principle
GB/T15963—1995
Barium ions (Ba2+) are used to precipitate sulfate (SO,2-) ions into barium sulfate (BaSO.), and the sodium sulfate content in the sample is calculated from the mass of barium sulfate.
5.5.2 Reagents
95% ethanol (GB 679);
Absolute ethanol (GB678);
Hydrochloric acid (GB622), 1:1 solution;
Barium chloride (GB652), 10% solution;
Silver nitrate (GB670), 0.1mol/L solution. 5.5.3 Apparatus
Glass filter crucible, P30, pore size 16-30μm, 30mL; Suction filter bottle. 500mL;
Beaker, 400mL;
Quantitative filter paper, slow speed;
High temperature furnace, capable of controlling the temperature at 900±10℃;
Porcelain crucible, 30mL.
5.5.4 Test procedure
Weigh 1g of sample (accurate to 0.2mg) in a 400ml tall beaker, add a small amount of water to moisten, then add 100mL of anhydrous ethanol (5.5.2b), stir well, cover with glass III, place in a water bath and digest at a temperature below the boiling point of ethanol for 1h, filter with a glass filter (5.5.3a) while hot, and wash the filter with 100ml of hot ethanol (5.5.2a). Then use a mixture of 100mL of water and 20mL of hydrochloric acid (5.5.2c) that has been heated to boiling to dissolve the ethanol insoluble matter in batches and wash the beaker and filter crucible, use a clean suction filter bottle to filter the solution and washing liquid one by one, and transfer to a 400mL beaker, heat to boil, slowly add 15mL of barium chloride solution (5.5.2d), and keep it boiling for 30min. Filter with quantitative filter paper and wash with hot distilled water until the filtrate is free of chloride ions (check with silver nitrate solution). Put the filter paper and the precipitate together in a constant weight porcelain, slowly heat and dry to carbonize, then move into a 900℃ high temperature furnace and burn for 30 minutes until the residue is completely white. Move the crucible into a dryer and cool for 30 minutes, then weigh it.
5.5.5 Calculation of test results
+ The sodium sulfate content (X,) in dialkyl sodium sulfate is expressed as mass percentage and calculated according to formula (2): (ml = m.) × 0.6086 × 100 X(%)
Where: mt---the mass of the crucible after burning with barium sulfate, g; m2---the mass of the empty crucible after burning?g;
ma-the mass of the sample, g;
0.6086--the coefficient for converting barium sulfate into sodium sulfate. The difference between parallel determination results should not exceed 0.2%. 5.6 Determination of sodium chloride content
5.6.1 Principle
(2)
The aqueous solution of the sample is adjusted to neutrality with nitric acid or sodium hydroxide solution and the chloride content is determined by the argentometric method (Mole method) and calculated as sodium chloride.
5.6.2 Reagents
Silver nitrate (GB670), c(AgNO)=0.1mol/L. Standard solution, prepared and calibrated according to the provisions of Article 4.21 of GB601; Potassium chromate (HG3918), 5% solution;
Nitric acid (GB626). c(HNO,) 0.1mol/L solution; 423
GB/T15963--1995bZxz.net
Sodium hydroxide (GB629), c(NaOH)～0.1mol/L solution; e.
Phenolyl (GB10729), 10g/L95% ethanol solution. 5.6.3 Apparatus
a. Conical flask, capacity 250mL;
b. Brown stoppered burette, 50ml.
5.6.4 Test procedure
Weigh 5 g of sample (5.1) into a conical flask (5.6.3a) and weigh to the nearest 1 mg. Add 50 mL of water to dissolve the sample and add 2 drops of phenolphthalein indicator solution (5.6.2e). If it turns red, neutralize it with nitric acid solution (5.6.2c) to neutrality. If it does not turn red, neutralize it with sodium hydroxide solution (5.6.2d) to red, and then neutralize it with nitric acid solution (5.6.2c) to neutrality. Then add 1 mL of potassium chromate solution (5.6.2b) and use silver nitrate standard solution (5.6.2a) Titrate until a stable light brick red color appears. Record the volume (V) of the silver nitrate solution used. 5.6.5 Calculation of test results
The sodium chloride content (X) in sodium dodecyl sulfate is expressed as a mass percentage and is calculated according to formula (3): X. (%) = 0. 058 5cv
Where: -- concentration of the silver nitrate standard solution, mol/L; V.
- volume of the silver nitrate standard solution consumed in the titration, mL; mo-
mass of the sample, g:
0.0585- millimolar mass of sodium chloride, g/mmol. The difference between the results of parallel determinations should not exceed 0.03%. 5.7 Determination of moisture
5.7.1 Principle
The mass reduced by drying the sample in an oven at 103°C to constant weight. 5.7.2 Apparatus
Weighing bottle, D40mm×30mm or D50mm×30mm, with cover; electric oven, temperature controllable at 103±2℃; b.
c. "Dryer, with effective desiccant (such as color-changing silica gel) inside. 5.7.3 Test procedure
(3)
Weigh 2g of sample (accurate to 0.2mg) into a weighing bottle that has been dried to constant weight and spread it out. Place the weighing bottle in an oven at 103±2℃ for 2h, take it out and place it in a dryer, cool it for 30min and weigh it. Repeat the process of placing it in the oven for 30min, cooling it and weighing it until the difference between two consecutive weighings is less than 1mg, which is considered to be constant weight. 5.7.4 Calculation of test results
The water content (X,) in sodium dialkyl sulfate is expressed as mass percentage and calculated according to formula (4). X, (%) =
Wherein: m.
-the mass of the empty weighing bottle, g;
m.-the mass of the weighing bottle and the sample before drying, g; m2---·-the mass of the weighing bottle and the sample after drying, g. The difference between the parallel determination results shall not exceed 0.2%. 5.8 Determination of whiteness (Wc)
mi-m2
2×100
m,-mo
+The whiteness (Wc) of sodium dialkyl sulfate powder (needle) products shall be determined in accordance with GB/T13176.1. 5.9 Determination of color
（4）
GB/T 15963--1995
The color of sodium dodecyl sulfate liquid product is expressed in Hazen units, and the color value of 8% solution of the sample is determined according to GB/T3143. 6 Inspection rules
6.1 Factory inspection
All indicators in the technical requirements in Chapter 4 are factory inspection items. 6.2 Batching and sampling rules
6.2.1 Products of the same grade and batch number delivered at one time are considered a batch. 6.2.2 The product shall first be inspected and qualified by the quality inspection department of the manufacturer in accordance with this standard, and a certificate of conformity and inspection report shall be issued before it can be shipped. The receiving unit shall accept the goods in accordance with this standard based on the certificate of conformity, and conduct sampling inspection when necessary. 6.2.3 Sampling
The sample size shall be determined according to Table 2 based on the batch size, and the sample units shall be randomly selected from the batch. Table 2
Batch, number of bags and barrels
Sample size, number of bags and barrels
15 and below
51～150
151～500
Above 500
Use a sampler to take an equal amount of sample from each sample unit, so that the total amount is about 1.5kg. After mixing and dividing the samples according to the method specified in GB/T13173.1, they are divided into three clean, dry stoppered sample bottles, stoppered and sealed. The label indicates the sample name, grade, batch number, production site, sampling date and sampler. The sample is inspected by both parties to the delivery, and the third copy is kept by the delivery party for arbitration inspection. The storage period is one month.
6.3 Judgment rules
The test results of the sodium dodecyl sulfate sample are judged by the rounded value comparison method, that is, after the test results are rounded to the same effective digits as the technical requirement value according to GB8170, the inspection batch of products is judged to be qualified or unqualified by comparing the technical requirement limit value. If one of the physical and chemical index test results does not meet the requirements of this standard, it is allowed to take samples from the double amount of samples of the batch to re-test the unqualified items. If they still fail to meet the requirements, the batch of products will be judged to be unqualified. If the two parties to the delivery disagree on the product inspection results, the two parties may negotiate to resolve the issue. If necessary, they may jointly select an arbitration agency for inspection and ruling. 7 Marking, packaging, transportation, storage
7.1 The following markings should be on the packaging bags, boxes or barrels: a.
Product name and grade;
Gross weight and net weight;
Production batch number and packaging date;
Manufacturer name and address;
Product standard code;
Shelf life.
7.2-Sodium dodecyl sulfate powder (needle) products can be packaged in polypropylene woven bags or cardboard boxes lined with plastic film. The net weight of each bag should not exceed 50kg, and the net weight of each box should not exceed 20kg; liquid products should be packaged in plastic barrels or suitable metal barrels. The actual net weight should not be less than the nominal weight. All kinds of packages should be tightly sealed without leakage. 7.3 During transportation, the products should be loaded and unloaded gently to prevent collision. Products packed in bags (boxes) should be covered to prevent rain and moisture. 7.4 Products should be stored in a cool, dry and ventilated warehouse, away from various sources of corrosion. Products packed in bags (boxes) should also be padded off the ground to prevent moisture and ensure that the container is not damaged.
7.5 Under the above storage and transportation conditions, the shelf life of the product is one year from the date of packaging. 425
Additional remarks:
This standard is proposed by China Light Industry General Association.
GB/T15963—1995
This standard is under the jurisdiction of the National Surfactant Detergent Standardization Center. This standard was drafted by Shanghai Yali Factory and Dalian Oil Chemical Factory, and Tianjin Fourth Daily Chemical Factory participated in the drafting. The main drafters of this standard are Wang Chunlong, Chen Chunsheng, Chen Jianfen, Guo Manling and Sun Xiuzhi. 426Number of bags and barrels
15 and below
51～150
151～500
Above 500
Use a sampler to take an equal amount of samples from each sample unit, so that the total amount is about 1.5kg. After mixing and dividing the samples according to the method specified in GB/T13173.1, they are divided into three clean, dry stoppered sample bottles, stoppered and sealed. The label indicates the sample name, grade, batch number, production area, sampling date and sampler. The sample is inspected by both parties to the delivery, and the third copy is kept by the delivery party for arbitration inspection. The storage period is one month.
6.3 Judgment rules
The test results of sodium dodecyl sulfate samples are judged by the rounded value comparison method, that is, after the test results are rounded to the same effective digits as the technical requirements according to GB8170, the inspection batch of products is judged to be qualified or unqualified by comparing with the technical requirements limit value. If one of the physical and chemical index test results does not meet the requirements of this standard, it is allowed to take samples from the double amount of samples of the batch to re-test the unqualified items. If they still fail to meet the requirements, the batch of products will be judged to be unqualified. If the two parties to the delivery disagree on the product inspection results, the two parties may negotiate to resolve the issue. If necessary, they may jointly select an arbitration agency for inspection and ruling. 7 Marking, packaging, transportation, storage
7.1 The following markings should be on the packaging bags, boxes or barrels: a.
Product name and grade;
Gross weight and net weight;
Production batch number and packaging date;
Manufacturer name and address;
Product standard code;
Shelf life.
7.2-Sodium dodecyl sulfate powder (needle) products can be packaged in polypropylene woven bags or cardboard boxes lined with plastic film. The net weight of each bag should not exceed 50kg, and the net weight of each box should not exceed 20kg; liquid products should be packaged in plastic barrels or suitable metal barrels. The actual net weight should not be less than the nominal weight. All kinds of packages should be tightly sealed without leakage. 7.3 During transportation, the products should be loaded and unloaded gently to prevent collision. Products packed in bags (boxes) should be covered to prevent rain and moisture. 7.4 Products should be stored in a cool, dry and ventilated warehouse, away from various sources of corrosion. Products packed in bags (boxes) should also be padded off the ground to prevent moisture and ensure that the container is not damaged.
7.5 Under the above storage and transportation conditions, the shelf life of the product is one year from the date of packaging. 425
Additional remarks:
This standard is proposed by China Light Industry General Association.
GB/T15963—1995
This standard is under the jurisdiction of the National Surfactant Detergent Standardization Center. This standard was drafted by Shanghai Yali Factory and Dalian Oil Chemical Factory, and Tianjin Fourth Daily Chemical Factory participated in the drafting. The main drafters of this standard are Wang Chunlong, Chen Chunsheng, Chen Jianfen, Guo Manling and Sun Xiuzhi. 426Number of bags and barrels
15 and below
51～150
151～500
Above 500
Use a sampler to take an equal amount of samples from each sample unit, so that the total amount is about 1.5kg. After mixing and dividing the samples according to the method specified in GB/T13173.1, they are divided into three clean, dry stoppered sample bottles, stoppered and sealed. The label indicates the sample name, grade, batch number, production area, sampling date and sampler. The sample is inspected by both parties to the delivery, and the third copy is kept by the delivery party for arbitration inspection. The storage period is one month.
6.3 Judgment rules
The test results of sodium dodecyl sulfate samples are judged by the rounded value comparison method, that is, after the test results are rounded to the same effective digits as the technical requirements according to GB8170, the inspection batch of products is judged to be qualified or unqualified by comparing with the technical requirements limit value. If one of the physical and chemical index test results does not meet the requirements of this standard, it is allowed to take samples from the double amount of samples of the batch to re-test the unqualified items. If they still fail to meet the requirements, the batch of products will be judged to be unqualified. If the two parties to the delivery disagree on the product inspection results, the two parties may negotiate to resolve the issue. If necessary, they may jointly select an arbitration agency for inspection and ruling. 7 Marking, packaging, transportation, storage
7.1 The following markings should be on the packaging bags, boxes or barrels: a.
Product name and grade;
Gross weight and net weight;
Production batch number and packaging date;
Manufacturer name and address;
Product standard code;
Shelf life.
7.2-Sodium dodecyl sulfate powder (needle) products can be packaged in polypropylene woven bags or cardboard boxes lined with plastic film. The net weight of each bag should not exceed 50kg, and the net weight of each box should not exceed 20kg; liquid products should be packaged in plastic barrels or suitable metal barrels. The actual net weight should not be less than the nominal weight. All kinds of packages should be tightly sealed without leakage. 7.3 During transportation, the products should be loaded and unloaded gently to prevent collision. Products packed in bags (boxes) should be covered to prevent rain and moisture. 7.4 Products should be stored in a cool, dry and ventilated warehouse, away from various sources of corrosion. Products packed in bags (boxes) should also be padded off the ground to prevent moisture and ensure that the container is not damaged.
7.5 Under the above storage and transportation conditions, the shelf life of the product is one year from the date of packaging. 425
Additional remarks:
This standard is proposed by China Light Industry General Association.
GB/T15963—1995
This standard is under the jurisdiction of the National Surfactant Detergent Standardization Center. This standard was drafted by Shanghai Yali Factory and Dalian Oil Chemical Factory, and Tianjin Fourth Daily Chemical Factory participated in the drafting. The main drafters of this standard are Wang Chunlong, Chen Chunsheng, Chen Jianfen, Guo Manling and Sun Xiuzhi. 426
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