HG/T 2575-1994 Determination of the wetting power of surfactants - Immersion method
Some standard content:
Chemical Industry Standard of the People's Republic of China
HG /T 2575 -- 94
Surfactants
Determination of wetting power
Issued on 1994-02-22
Ministry of Chemical Industry of the People's Republic of China
Immersion method
Implementation on 1994-10-01
Chemical Industry Standard of the People's Republic of China
Surfactants
Determination of wetting power
Immersion method
IG / T 2575 - 94
This standard adopts the international standard ISO8022--1984 "Surfactants - Determination of wetting power" 1 Subject content and scope of application
This standard specifies a method for determining the wetting power of surfactant solutions by immersion using raw cotton cloth discs. This standard is applicable to neutral. All surfactants (regardless of their ionic properties) used as textile wetting agents in weakly acidic or weakly alkaline solutions, not applicable to mercerizing agents (strongly ionizing solutions) or carbonizing agents (strongly acidic solutions). 2 Terms
Wetting power (wetting power): The ability of a solution to replace the air trapped in cotton cloth when the cotton cloth is immersed in a surfactant solution. Wetting time-concentration curve: Determine the wetting time of a raw cotton cloth disc immersed in a tested surfactant solution or a standard wetting agent solution of known concentration, and draw a line on a double logarithmic coordinate paper for the corresponding concentration. The wetting power of the surfactant is evaluated through the curve graph.
Relative wetting power: Adjust the concentration of the wetting agent standard and the sample (or the concentration of two different samples) so that the sedimentation time of the original cloth piece in the solution is within the specified numerical range. The relative wetting power of the wetting agent is expressed by the ratio of the concentration of the standard and the sample (or two different samples).
3 Principle
Clamp the cotton disc with known characteristics with a submerged clamp and immerse it in a surfactant solution of known concentration. Since the air in the cotton fiber is contained in the air, the cotton disc tends to float to the liquid surface. Under the action of the submerged clamp, the cotton disc is completely immersed in the solution. When the liquid penetrates into the cotton, the air is replaced and the cotton disc begins to settle. Measure the time from the cotton disc being submerged to the beginning of sedimentation.
Measure the wetting time of five different concentration solutions of the surfactant standard sample and the test sample respectively, draw the wetting time-liquidity curve on the double logarithmic coordinate paper, compare the relative position of the curve, and determine the wetting force of the tested surfactant. Or use relative wetting force and wetting time (seconds) to express the wetting performance of the surfactant. 4 Reagents and materials
4.1 Steaming water for laboratory use (GB/T6682): Grade 3 water: 4.2 Penetrant BX (ZBG 73 009);
4.3 Penetrant IFC (ZBG73007);
4.4 Raw cotton cloth kitchen piece: @35mm,
It is cut from the cloth with the contraction number 5102 in GB2907 "Natural canvas for shoes". It needs to be placed under standard conditions of relative humidity of 65% and temperature of 20℃ for 24h. It is also possible to place nitrite-saturated gel under the glass desiccator as a humidistat, and the relative humidity at 20°C is 65%.
Approved by the Ministry of Chemical Industry of the People's Republic of China on February 22, 1994 and implemented on October 1, 1994
5 Instruments and equipment
HG/T 2575-94
5.1 Stopwatch: accuracy 0.1s
5.2 Immersion clamp, made of stainless steel wire with a diameter of about 2mm, dimensions see Figure 1 and Figure 2 (Figure 2 is a typical fixed coplanar three-arm immersion clamp).
Immersion clamp
6 Determination steps
6.1 Sample preparation
6.1.1 Preparation of samples of the same variety
6.1.1.1 Preparation of standard sample solution
HG T 2575 -
Figure 2 Immersion clamp pattern
Weigh a certain amount of standard samples, such as penetrant BX (4.2), penetrant JFC (4.3), etc., and weigh the sample amount to adjust the concentration of the standard solution to the sedimentation time of the palm cloth disc within 100±10s, accurate to 0.001g, place it in a 250mL beaker, add a small amount of distilled water, slurry, heat and stir until completely dissolved, transfer to a 1000mL volumetric flask, dilute to the scale, shake well and set aside. 6.1.1.2 Preparation of sample solution, same as 6.1.1.t, 6.1,2 Preparation of different sample and sample solutions
Weigh different amounts of standard samples and samples (accurate to 0.001g), and prepare 1L solution respectively, the preparation method is the same as 6.1.1.1. The wetting time of the cloth piece should be controlled between 5±1s and 300s for five different concentrations. If the Krafft temperature of the surfactant is higher than 40℃, the slurry mixing and dissolving temperature should be at least the same as its Krafft temperature.
Keep the prepared standard or sample solution at 20±2℃ until the measurement starts. The measurement should be carried out within 15min to 2h after the solution is prepared.
6.2 Preparation of cotton cloth discs
Take a disc with a diameter of 35mm on the original cloth. In order to prevent the surface of the cloth from being contaminated with fat and sweat and affecting the measurement, avoid direct contact of the cotton cloth with fingers.bzxz.net
6.3 Cleaning of instruments
The instruments used should be kept clean. Beakers and other glass instruments should be cleaned with detergent and then rinsed with distilled water until neutral, and finally rinsed with a small amount of test solution. Before the clamp (5.2) is removed, it should be cleaned in an azeotropic mixture of ethanol and trichloroethylene for 30min, and then rinsed with a small amount of test solution.
6.4 Determination
The determination operation is shown in Figure 3.
The temperature of the measuring solution should be 20 ± 2 °C.
HG/ T 2575 - 94
Figure 3 Operation diagram
Measure 700 mL of the solution to be tested and pour it into a 1000 mL beaker. In order to prevent the generation of foam, the solution to be tested should flow slowly along the inner wall of the beaker.
Hold the cotton cloth disc (4.4) with an immersion clamp (5.2), keep it nearly vertical, and immerse it about 40 mm below the surface of the test solution. As soon as the lower end of the cloth piece touches the test tube, start the stopwatch (5.1) immediately, place the plane trident arm on the mouth of the beaker, and make the immersion clamp (5.2) open and close for about 6m. When the cloth piece starts to sink automatically, stop the timing and record the wetting time. Repeat the measurement for the same solution ten times. After each measurement, take out the cloth piece (4.4) and discard it. When measuring the same variety of samples, take the average value of the ten repeated measurement data, remove the data that are more than 20 seconds away from the average value, and then take the average value, which is the wetting time of the sample. For each group of different concentrations of different varieties of samples, the concentration of the sample solution should be increased gradually. The wetting time of the lowest concentration solution should be about 300s, and the wetting time of the highest concentration solution should be 5±1s. Repeat the measurement for each concentration of solution ten times, and take the average value as the wetting time of the solution of that concentration. 6.5 Calibration of cotton cloth
When using a new batch of cotton cloth or wanting to compare the measured results of two non-net cotton cloths, you can use a standard sample or select a surfactant with known wetting power. Under the same temperature and relative humidity conditions, measure the wetting time of five solutions of different concentrations according to the steps described in 6.4, draw the wetting time-swelling curve on the double logarithmic coordinate paper, and compare them. Expression of the measurement results
7.1 The relative wetting power of samples of the same variety is calculated according to the formula (t): X
Where: Y-
-relative wetting power of sample, %;
c-thickness of standard solution, g/L;
-concentration of sample solution, product/L.
HG / T 2575 94
7.2 Relative wetting power of different samples
According to the wetting time and corresponding concentration of the samples and standard solutions of different concentrations prepared in 6.1, the wetting time-concentration curve of the tested surfactant and the standard sample (or the surfactant with known wetting power) is plotted on the double logarithmic coordinates. A corresponding curve can be drawn for each product sample or standard sample. (See Figure 4) By comparing the relative positions of the measured surfactant and the standard sample (or the surfactant with known wetting power), the wetting power of the tested surfactant can be evaluated: or the concentrations corresponding to various surfactants at the same wetting time are plotted, and a certain surfactant is used as the standard, and the relative wetting power is calculated according to formula (2). 10
Wetting time, s
Figure 4 shows the wetting time-concentration curves of surfactants A, B, C and standard samples D, E. Y
HG/T257S
— 94
Where: X is the relative wetting force of different surfactant samples, %, C is the concentration of the surfactant solution used as the standard sample, %/L: c4 is the concentration of the sample solution, %/L.7.3 Under the same test conditions (concentration of solution, test humidity, relative humidity, properties of cotton cloth, etc.), wetting time (s) can also be used to describe the wetting properties of a sample under test. 8 Test report
The test report should include the following:
All information required for complete identification of the sample; Characteristics of the original cloth used to cut the cotton cloth disc: b.
Reference method used;
The properties of the water and auxiliaries used:
The temperature during the test:
The method used to express the results (e.g., graphic method): Any operating details not specified in this standard or optional, and any conditions that may affect the results Additional remarks:
This standard is under the jurisdiction of the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Shanghai Dyestuff Research Institute, which is responsible for drafting this standard. The main drafters of this standard are Ling Peijiang and Ji Jufen. From the implementation of this standard, the original national standard GB5557--85 "Wet method for determination of penetration of surfactant textile auxiliaries" will be invalid.
People's Republic of China
Chemical Industry Standard
Surfactant
Immersion Method
Determination of Wetting Power
HG/T2575-94
Editor: Chemical Industry Standard Editorial Department
(Institute of Standardization, Ministry of Chemical Industry)
Postal Code: 100011
Printer: Institute of Standardization, Ministry of Chemical Industry
Copyright: All Rights Reserved. Reprinting is prohibited
Format: 880×12301/16, i.e., number of pages: 12000, first edition in September 1994
First printing in September 1994
Print run: 1-500
I. Cost of Book: 2.90
2575-94
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