This standard specifies the test method for the alkali resistance of surfactants. This standard is applicable to the test of the alkali resistance of water-soluble surfactants. GB/T 5556-2003 Test method for alkali resistance of surfactants GB/T5556-2003 Standard download decompression password: www.bzxz.net

The consistency degree of this standard is not equivalent to GB/T5556-2003
Determination of alkali resistance". This standard and TGL10171:1961 "Determination method of textile auxiliaries" This standard replaces GB/T5556-1985 "Determination of alkali resistance of surfactant textile auxiliaries". The main differences between this standard and GB/T5556-1985 are: - Standardized the Chinese and English names of the standard;
According to the provisions of GB/T1.1-2000, the writing format is standardized and the content of the test report is added.
This standard will replace GB/T5556--1985 from the date of implementation. This standard is proposed by the China Petroleum and Chemical Industry Association. This standard is under the jurisdiction of the Chemical Industry Surfactant Standardization Technical Committee. The drafting unit of this standard: Shanghai Dyestuff Research Institute. The main drafters of this standard: Ji Jufen, Zhuang Yongbin. This standard was first issued in 1985.
1 Scope
Surfactants
This standard specifies the test method for the alkali resistance of surfactants. Alkali resistance test method
This standard is applicable to the test of the alkali resistance of water-soluble surfactants. 2 Principle
GB/T5556—2003
Alkali has a hydrolysis effect on certain surfactants, and the solubility of the hydrolysis product is different from that of the original product. Therefore, the alkali resistance of this surfactant in alkaline aqueous solution can be judged from the change in the appearance of the solution. 3 Reagents and materials
3.1 Anhydrous sodium carbonate: analytically pure;
3.2 Sodium hydroxide: chemically pure, 400g/L solution; 3.3 Sodium sulfide: analytically pure;bzxz.net
3.4 ​​Sodium dithionite (insurance powder): chemically pure. Instruments and equipment
General laboratory instruments and:
4.1 Round bottom flask: 250mL;
4.2 Ball condenser: 300mm;
4.3 Electric constant temperature water bath: constant temperature range (37~100)℃±1℃. 5 Test method
5.1 Preparation of test solution
5.1.1 Sodium carbonate test solution
5.1.1.1 Weigh 2g of sample (accurate to 0.1g) and 4g of anhydrous sodium carbonate (accurate to 0.1g), respectively, dissolve each with 450mL of distilled water, then transfer the two solutions into a 1000mL volumetric flask, dilute to the mark, shake well and set aside. 5.1.1.2 Weigh 5 g of the sample (accurate to 0.1 g), and follow the rest in 5.1.1.1. 5.1.2 Sodium hydroxide test solution
5.1.2.1 Weigh 2 g of the sample (accurate to 0.1 g), dissolve it in about 300 ml of distilled water, add 1.5 ml of sodium hydroxide solution (3.2) to another 400 ml of distilled water, then transfer the two solutions to a 1000 ml volumetric flask, dilute to the mark, shake well and set aside. 5.1.2.2 Weigh 5 g of the sample (accurate to 0.1 g), and the rest is the same as 5.1.2.1. 5.1.3 Sodium sulfide test solution
5.1.3.1 Weigh 2 g of the sample (accurate to 0.1 g) and dissolve it in about 300 ml of distilled water, then weigh 8 g of anhydrous sodium carbonate (accurate to 0.1 g) and dissolve it in about 200 mL of distilled water, and finally weigh 40 g of sodium sulfide and dissolve it in 200 mL of distilled water. Transfer the above three solutions into a 1000 mL volumetric flask, dilute to the scale, shake well and set aside. 5.1.3.2 Weigh 5 g of the sample (weigh to 0.1 g), and prepare it in the same way as in 5.1.3.1. 5.1.4 Sodium dithionite test solution
5.1.4.1 Weigh 2 g of the sample (weigh to 0.1 g), dissolve it with about 300 mL of distilled water, and take another 16 mL of sodium hydroxide solution (3.2), dilute it with about 400 mL of distilled water, mix the two solutions, transfer them to a 1000 mL volumetric flask, and then slowly add 4 g of sodium dithionite (GB/T5556--2003
(weigh to 0.1 g) to completely dissolve it, and finally dilute it to the scale with distilled water, shake well and set aside. 5.1.4.2 Weigh 5g of the sample (accurate to 0.1g), and prepare it in the same way as 5.1.4.1. 5.2 Determination
5.2.1 Take 200mL of each of the above test solutions 5.1.1.1, 5.1.1.2, 5.1.2.1, 5.1.2.2, 5.1.3.1, and 5.1.3.2 and transfer them to 6 numbered 250mL round-bottom flasks, and observe the appearance of the solution. Then heat to boiling and reflux. Visually inspect the appearance of the solution three times at 30 min, 60 min, and 120 min from the start of reflux. After reflux, stop heating, leave it overnight, and visually inspect it again the next day. If there is turbidity or precipitation, it must be heated to boiling and then visually inspected again. The results of the two tests shall prevail. 5.2.2 Take 200 mL of each of the test solutions 5.1.4.1 and 5.1.4.2 and place them in two 250 mL round-bottom flasks. Observe the appearance of the solutions. Then move the flasks to an electric thermostatic water bath and keep them warm at 60°C for 2 h. When the temperature in the solution reaches 60°C, start timing. Visually inspect the solution three times at 30 min, 60 min and 120 min. Record the appearance of the solution. After 2 h, take out the flasks and leave them overnight. Visually inspect them again the next day. If there is turbidity or precipitation, heat them to 60°C and observe whether there is any change in appearance. 6 Evaluation of results
6.1 Self-test rating standards
Level 1 - the solution is completely clear;
Level 1~2 - the solution is milky white to slightly turbid; Level 2 - the solution is turbid but without floccules; Level 2~3 - the solution is very turbid but without floccules or oily matter separated; Level 3 - whether the solution is clear or turbid, floccules or oily matter separated. 6.2 Evaluation
After the two concentrations of samples are tested with four groups of alkali concentrations, their alkali resistance is evaluated according to the rating standards in 6.1, which can be divided into three levels: the highest alkali resistance level, alkali resistance level, and non-alkali resistance level. The specific provisions are as follows: Highest alkali resistance level - all samples are rated at level 1 or 1-2 after being tested; alkali resistance level - all samples are rated at level 1 or 1-2, or even level 2 after being tested, and at level 2-3 after being left to stand overnight; non-alkali resistance level - all samples are rated at level 3 after being tested. 7 Test report
The test report shall include the following contents:
a) Name of the surfactant tested;
No. and year of this standard;
Model and number of the instrument used,
Test results,
Special circumstances during the test;
f) Differences from this method;
Test date.
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