GB/T 38730-2020 English PDF

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GB/T 38730-2020: Determination of water dispersing power of surfactants in dry cleaning solvents
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Basic data

Standard ID: GB/T 38730-2020 (GB/T38730-2020)
Description (Translated English): Determination of water dispersing power of surfactants in dry cleaning solvents
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G72
Classification of International Standard: 71.100.40
Word Count Estimation: 10,143
Date of Issue: 2020-04-28
Date of Implementation: 2020-11-01
Quoted Standard: GB/T 6372; QB/T 1223
Adopted Standard: ISO 6837-1982, MOD
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
Summary: This standard specifies the methods for the determination of water solubilizing power and water emulsifying power. This standard applies to dry cleaning detergents or auxiliary products whose concentration is usually 3 g/L to 5 g/L and other suitable concentrations in the washing tank. This standard does not apply to ancillary products containing higher concentrations of surfactants in solvents and water, such as chemical cleaning products for brushing or spraying.

GB/T 38730-2020: Determination of water dispersing power of surfactants in dry cleaning solvents

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Determination of water dispersing power of surfactants in dry cleaning solvents ICS 71.100.40 G72 National Standards of People's Republic of China Surfactant in dry cleaning solvent Water dispersion measurement 2020-04-28 released 2020-11-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard uses the redrafting method to amend and adopt ISO 6837.1982 "Water Dispersibility of Surfactants in Dry Cleaning Solvents". Compared with ISO 6837.1982, the structure of this standard is adjusted as follows. ---Chapter 3 "Definitions" in ISO 6837.1982 was deleted, and the numbers of the subsequent articles were revised in sequence; --- 6.7, 6.8 and 6.9 in ISO 6837.1982 are deleted. The technical differences between this standard and ISO 6837.1982 and the reasons are as follows. ---Regarding normative reference documents, this standard has made adjustments with technical differences to adapt to my country's technical conditions and adjustments. The situation is reflected in Chapter 2 "Normative Reference Documents". The specific adjustments are as follows. ● Replace ISO 607 with GB/T 6372, which is equivalent to adopting international standards (see Chapter 6); ● Replace ISO 2456 with QB/T 1223 which is modified to adopt international standards (see Chapter 4); ● The normative references ISO 385-1, ISO 565, ISO 648, ISO 3819, ISO 4788 and ISO 4797 have been deleted. ---In order to adapt to the use situation in our country, Chapter 3 "Definitions" in ISO 6837.1982 is deleted; ---In order to adapt to the actual situation of our country, the measurement principle of this method is modified (see Chapter 3); --- In order to adapt to the actual situation in my country, tetrachloroethylene has been added to the list of reagents (see 4.1); ---In order to adapt to the actual situation in my country, the requirements for general laboratory utensils have been deleted (see Chapter 5); ---As it was not used during the test, the 500mL volumetric flask was deleted (see 5.1); ---In order to adapt to our country's usage habits, the capacity of the beaker used has been modified (see 5.2); ---In order to adapt to the actual situation of our country, the type of magnetic stirrer used has been modified (see 5.6); ---The water solubilizing power tester is added to the equipment list, and the method of measuring the transmitted light intensity is adopted to improve the measurement accuracy and realize the recording of data Recording and continuous processing, delete the use of sieve plates, lighting boxes and black cards (see 5.7); ---In order to adapt to the actual situation in my country, a balance has been added to the instrument list (see 5.8); ---According to the newly added measuring instrument, the test instrument icon has been modified (see Figure 1); ---For safety reasons, a warning about the use of reagents has been added (see Chapter 7); ---Considering the accuracy of this method, the operating requirements after the solution is prepared (see 7.2.2); ---According to the new measuring instrument, the description of the water solubilizing power measurement process has been modified (see 7.3.1); ---In order to adapt to the actual situation in our country, the precise measurement process of water solubilization power has been added (see 7.3.2); ---According to the newly-added measuring instrument, the process description of the water emulsifying power determination is modified (see 7.4.1); ---In order to adapt to our country's usage habits, the order and amount of Sudan Red Ⅲ added were modified (see 7.4.1); ---In order to adapt to the actual situation of our country, the precise measurement process of water emulsifying power has been added (see 7.4.2); ---In order to adapt to the actual method situation, the water solubilizing power determination formula is modified (see 8.1); ---In order to adapt to the actual situation of our country, the water emulsifying power determination formula has been added (see 8.2); ---In order to adapt to the actual situation of our country, the test date and test personnel requirements have been increased (see Chapter 9). This standard also made the following editorial changes. ---Modified the standard name; ---Delete the nickname of Sudan Red III (see 4.2); ---According to the requirements of national standards, more parts of the experimental steps are subdivided (see 7.2, 7.3); ---Added the numbers and titles of the figures and tables (see Figure 1, Table 1). This standard was proposed by the China National Light Industry Council. This standard is under the jurisdiction of the National Standardization Technical Committee for Surfactants and Detergents (SAC/TC272). Drafting organizations of this standard. Qingdao Agricultural University, China Daily Chemical Research Institute Co., Ltd. [National Detergent Products Quality Supervision and Inspection Center (Taiyuan)], Suzhou Shipu Testing Technology Co., Ltd., Shanghai Kaimi Technology Co., Ltd., Shenzhen Yanqian Technology Co., Ltd., Xiamen Amber Day Chemical Technology Co., Ltd., Guangdong Zhongfei Fine Chemical Co., Ltd. The main drafters of this standard. Xue Changhui, Yao Chenzhi, Li Xiaorui, Dai Dan, Qiang Pengtao, Cai Jianbo, Fang Xiyan, Zhou Huosheng. Surfactant in dry cleaning solvent Water dispersion measurement

1 Scope

This standard specifies the determination method of water solubilizing power and water emulsifying power. This standard applies to dry cleaning detergents or auxiliary products with a concentration of 3g/L~5g/L and other suitable concentrations in the washing tank. This standard does not apply to ancillary products that contain higher concentrations of surfactants in solvents and water, such as chemical washing used for scrubbing or spraying. product.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 6372 Surfactant and detergent sample dividing method (GB/T 6372-2006, ISO 607.1977, IDT) QB/T 1223 Water specifications and test methods for surfactants used as test solvents (QB/T 1223-2012, ISO 2456. 1986, MOD)

3 Principle

Water dispersion is the ability of dry cleaning detergents to solubilize or emulsify water in dry cleaning solvents. For this purpose, several detergents are formulated and the solvent content is constant. The pre-mixed solutions with continuously increasing water content are then used to prepare dry cleaning detergent samples with the desired final concentration. Solution. Use the method of measuring the light transmittance of the solution, that is, adding water to the dry cleaning detergent sample solution and not emulsifying, to determine the detergent of a given concentration The amount of water that can be solubilized to determine the water solubilization power of the detergent. Use the method of observing the phase separation of the solution, that is, add water to the dry cleaning detergent sample solution and consider that the phase has not been separated to determine the concentration of the detergent at a given concentration. The amount of emulsified water to determine the water emulsifying power of the detergent.

4 reagent

Unless otherwise specified, the analysis uses confirmed analytical reagents, and the water is water that meets the requirements of QB/T 1223. 4.1 Dry cleaning solvent. perchloroethylene. 4.2 Sudan Red III, CI26110.

5 Instruments

5.1 Conical beaker with frosted interface, 100mL. 5.2 Short beaker. 100mL (inner diameter of about ϕ24mm) and 500mL. 5.3 Pipette. 5mL and 10mL, accurate to 0.01mL. 5.4 Burette. 50mL, accurate to 0.01mL. 5.5 Measuring cylinder. 100mL and 500mL. 5.6 Temperature control magnetic stirrer. with magnets, and can control the temperature. 5.7 Water solubilizing power tester (see Figure 1). The cabinet is made of plywood or blockboard. The instrument includes four parts, which are the main cabinet, the characteristic deck, and Top cover and computer host computer. The main cabinet includes light source and wires, manual sample inlet door, circuit board; characteristic card holder includes special beaker holder; top cover Including sensors and LCD screen; computer host computer includes characteristic data recording and processing system software. Figure 1 The structure of the water solubilizing power tester 5.8 Balance. Sensitivity 0.01g.

6 Sample preparation

Prepare and store test samples of dry cleaning detergents according to GB/T 6372.

7 Test procedure

Warning---Due to the toxicity of perchloroethylene and Sudan Red III, the safety rules for handling toxic reagents must be followed when using the two reagents. 7.1 Test pieces Weigh a series of 10g (accurate to 0.01g) of dry cleaning detergent to be tested in a 100mL conical beaker (5.1). 7.2 Preparation of sample solution containing dry cleaning detergent with final concentration of approximately 3g/L or 5g/L for rough measurement 7.2.1 Under the constant temperature condition of 23℃±2℃, add 5mL dry cleaning solvent to each test part (7.1) with a pipette (5.3) (4.1), continue to use the burette (5.4) to add 1mL, 3mL, 6mL, 9mL, and 9mL to the above conical beaker in the order of increasing water volume. 12mL, 15mL, 18mL, 21mL. Add the above conical beaker to the magnet and stopper, use a magnetic stirrer (5.6) to place the magnet After stirring for 3 minutes without turbulence, use a 100mL graduated cylinder (5.5), and continue to add 55mL dry cleaning solvent to the above conical beaker (4.1), stopper the conical beaker again and stir at a speed without turbulence above the magnet for 3 minutes to prepare a dry cleaning detergent premix Solution. 7.2.2 Immediately use a pipette (5.3) to pipette 5mL or 10mL of the above-mentioned dry cleaning detergent premix solution into a 500mL beaker (5.2), and then use a 500mL graduated cylinder (5.5) to add the corresponding volume of dry-cleaning solvent (4.1) (the specific added volume varies according to the amount of water added, See Table 1). Then put a magnet in the above beaker, stir for 3 minutes, and prepare a dry cleaning detergent with a final concentration of about 3g/L or 5g/L The sample solution (after this solution is prepared, it needs to be determined immediately according to the provisions of 7.3.1). 7.3 Determination of water solubilization power 7.3.1 Rough measurement Under the constant temperature condition of 23℃±2℃, quickly pour the sample solution (7.2.2) of the series of dry cleaning detergent used for rough measurement into a 100mL beaker In (5.2), control the height of the sample solution to 5cm, place it in the water solubilizing power tester (5.7), measure the light transmittance of the solution, record the data and Plot to find the inflection point, the amount of water added in the solution corresponding to the inflection point is confirmed as the emulsification of the dry cleaning solvent, and the solution before the inflection point is regarded as unemulsion For the last solution to be converted, record the volume of water added to the solution as V0. 7.3.2 Fine test 7.3.2.1 Under the constant temperature condition of 23℃±2℃, according to the method in 7.2, weigh a series of 10.0g dry cleaning detergent to be tested in a 100mL cone In the beaker (5.1), use a pipette (5.3) to add 5 mL of dry cleaning solvent (4.1) to each of the above conical beakers, and continue to use the burette (5.4) Add V0 0.50mL, V0 1.00mL, and V0 to the above conical beaker in the order of 0.50mL increments of water volume. 1.50mL, V0 2.00mL, V0 2.50mL, which is equivalent to 3g/L sample solution, add 0.15g of water per liter, 5g/L Add 0.25 g of water per liter of the sample solution. Add the above conical beaker to the magnet and stopper, use a temperature-controlled magnetic stirrer (5.6) to place the magnet After stirring for 3 minutes without turbulence, use a 100mL graduated cylinder (5.5), and continue to add 55mL dry cleaning solvent to the above conical beaker (4.1), stopper the conical beaker again and stir at a speed without turbulence above the magnet for 3 minutes to prepare a dry cleaning wash for precise determination. Detergent premix solution. 7.3.2.2 Immediately use a pipette (5.3) to pipette 5 mL or 10 mL of the above-mentioned dry-cleaning detergent premix for precise determination. In a 500mL beaker (5.2), add a corresponding volume of dry cleaning solvent (4.1) with a 500mL graduated cylinder (5.5) (the specific volume depends on According to the change in the amount of water added, see Table 1). Then put a magnet in the above beaker and stir for 3 minutes to prepare the final mass for accurate determination. A dry cleaning detergent sample solution with a concentration of about 3g/L or 5g/L. 7.3.2.3 Under the constant temperature condition of 23℃±2℃, quickly pour the sample solution of the above dry cleaning detergent used for precision measurement into a 100mL beaker In (5.2), control the height of the sample solution to 5cm, place it in the water solubilizing power tester (5.7), and measure the light transmittance of the solution. Records Find the inflection point according to the graph, and the volume of water in the solution corresponding to the inflection point is the maximum volume VS that can be solubilized. 7.4 Determination of water emulsifying power 7.4.1 Rough measurement Under the constant temperature condition of 23℃±2℃, use a 100mL graduated cylinder (5.5) to measure 60mL for the prepared sample solution (7.2.2) In a series of 100mL conical beakers (5.1), add 0.0015g of Sudan Red III (4.2) colorant, that is, add Add 0.025g of Sudan Red III (4.2), add the magnet and stopper, stir with a magnetic stirrer (5.6) for 3 minutes, and slowly pour the formed emulsion In a 100mL graduated cylinder (5.5), let it stand still. After 15 minutes, visually check whether phase separation has occurred, and find the last sample solution that does not have phase separation. Starting solution, record the volume of water added to the solution as V1. Note 1.The red solution is easier to observe phase separation. For perchloroethylene, when all the added water is no longer emulsified, a film will form. The phenomenon is usually that a layer of white emulsion separates from the red emulsion. Note 2.It is also possible that no emulsion is formed, but flocculation occurs. In this case, the emulsifying power of water is equivalent to the maximum amount of water added without causing flocculation. Note 3.When the water concentration is lower than the water solubilizing power, it is possible to observe phase separation (emulsification or flocculation). In this case, the water emulsifying power is equal to the solubilizing power. 7.4.2 Fine test 7.4.2.1 Under the constant temperature condition of 23℃±2℃, weigh a series of 10.0g dry cleaning detergent to be tested in 100mL according to the method in 7.2 In the conical beaker (5.1), use a pipette (5.3) to add 5 mL of dry cleaning solvent (4.1) to each of the above conical beakers. The fixed tube (5.4) adds V1 0.50mL, V1 to the above conical beaker in the order of 0.50mL increments of water volume. 1.00mL, V1 1.50mL, V1 2.00mL, V1 2.50mL, which is equivalent to an increase of 3g/L of sample solution per liter 0.15g water, 5g/L sample solution adds 0.25g water per liter. Put the magnet into the cone After stirring for 3 minutes without turbulence, use a 100mL graduated cylinder (5.5), and continue to add 55mL dry cleaning solvent to the above conical beaker (4.1), stopper the conical beaker again and stir for 3 minutes at a speed without turbulence above the magnet, and prepare the emulsifying force for precise measurement. A premix solution of the starting solution. 7.4.2.2 Immediately use a pipette (5.3) to pipette 5 mL or 10 mL of the pre-mixed solution of the above-mentioned starting solution for precise emulsification power measurement In a 500mL beaker (5.2), use a 500mL graduated cylinder (5.5) to add the corresponding volume of dry cleaning solvent (4.1) (the specific volume is based on The amount of water added changes, see Table 1). Then put a magnet in the above beaker, stir for 3 minutes, and prepare the final concentration of dry cleaning detergent. It is a sample solution of 3g/L or 5g/L for precise measurement of emulsification power. 7.4.2.3 Use a 100mL graduated cylinder (5.5) to measure 60mL of the above-mentioned sample solution for precision measurement in a series of 100mL conical beakers In (5.1), add 0.0015g of the colorant Sudan Red III (4.2), that is, add 0.025g of Sudan Red III (4.2) colorant per liter of solvent, and then Stopper, use a magnetic stirrer (5.6), stir for 3min, slowly pour the formed emulsion into a 100mL graduated cylinder (5.5) and let it stand. After 15 minutes, visually observe whether phase separation occurs, find the last sample solution that does not undergo phase separation, and record the volume of water added to the solution Is the maximum volume VE.

8 Results presentation

8.1 Calculation of water solubilization power The water solubilization power S is expressed in grams of water per liter of solvent, calculated according to formula (1). 8.2 Calculation of water emulsifying power The water emulsifying power E is expressed in grams of water per liter of solvent, calculated according to formula (2). 8.3 Precision 8.3.1 Repeatability For the same sample, using the same experimental method, in the same laboratory, using the same instrument by the same operator in a short time Measured within the interval, the difference between the two successive determination results does not exceed 0.5. 8.3.2 Reproducibility Using the same experimental method, in different laboratories, different operators use different instruments to obtain the relative results of two independent measurement results. The difference is that the solubilizing power does not exceed 0.5, and the emulsifying power does not exceed 1.

9 Test report

The test report should include the following. a) All the information needed to fully identify the sample. b) The test method used (No. of this standard). c) Representation of the results obtained and the method of use. 1) Solubilizing power; 2) Emulsifying power. d) Operations that are not specified or added in the standard, and any unexpected phenomena that may affect the results. e) Test date and test personnel. ......

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