This standard specifies the determination method of the dispersing power of surfactants. This standard is applicable to the determination of the dispersing power of anionic dispersants. GB/T 5550-1998 Determination method of dispersing power of surfactants GB/T5550-1998 Standard download decompression password: www.bzxz.net

CR/T5550--1998
Compared with the previous version GB/I555L-1990, this standard has the following differences in technical content: The concentration of sulfuric acid solution is incorrectly stated in the original standard, and should actually be c(1/2H2S0,)=1.00 mlL/1.; 2 In order to improve the test accuracy, this revision changes the sample amount of dispersant in the test solution from 19mL.20ml. to 28.5 1ul.30.0 l.. The standard amount of dispersant is changed from 19 ml., 20 ml., 21 ml. to 28.5 ml., 30.0 iril., 31.5 ml. :3 In order to adapt to the continuous development of dispersant varieties in my country and facilitate users to use the standard, the original standard is retained without revision: 1 The weight of the sample and standard is 0.5g instead of 1g.6g
4 The original standard stipulates that the amount of sulfuric acid solution added to stop the coupling reaction is 1.0 mL. However, it is difficult to grasp the end point in actual application. This revision is changed to: add sulfuric acid solution (4.5) until the color of the determination line changes from clear red to turbid red, which is the end point, about 4 mL. This standard will replace GB/T55501990 from the date of implementation. This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China and is developed by the Surfactant Standardization Technical Committee of the Ministry of Chemical Industry. The drafting unit of this standard is Shanghai Dyestuff Research Institute. The main contributors of this standard: Ji Jufen, Ling Peijiang. This standard was first issued in 1980 and revised for the first time in 1990. Scope
National Standard of the People's Republic of China
Surfactants
Determination of dispersing power
Surface acive agents--
Determination of dispersing power This standard specifies the method for the determination of dispersing power of surfactants. This standard is applicable to the determination of dispersing power of anionic dispersants. 2 Reference standards
GB/T 5550—1998
(formerly GB/T5550-190)
The following standards contain provisions that are referenced in this standard and may constitute provisions of this standard. When this standard was published, the versions shown were valid and all references will be revised. Parties using this standard are advised to use the latest versions of the following standards. 3J3/[66821992 Specification and test method for water for analytical laboratories (eqISO3696:1987) 3 Principle
In a quantitative solution of the dispersion sample and standard sample, add the specified amount of fast pigment Scarlet Red 3RS solution respectively. At the same stirring speed, add a specified amount of dilute sulfuric acid solution at once. The trans-form of the fast pigment is rapidly converted into the form of the azo salt and reacts with the color to form an insoluble azo dye dispersion. Under closed conditions, the filter paper diffuses the seepage circle. The seepage circle area of ​​the sample and standard sample is compared, so as to calculate the H score of the dispersant dispersing power.
4 Reagents and materials
The water used in this standard shall comply with the third-grade water specified in B/T6682. 4.1% chemically pure alcohol:
4.2 Sodium hydroxide solution: nam=33 deadWww.bzxZ.net
4.3 Sulfur solution: c1/211,S0,)=1.00mol/L4.4 Quick pigment red 3R2S solution: 60g/1. Weigh quick pigment red 3R2S 6g (precision pen 0.1g) into a beaker, prepare 95 ethanol (4.1) 6tu1. slurry, add 1ml of sodium hydroxide solution (1.2), stir evenly, add 60l r: 88 ml of water, fully dissolve, filter and transfer to a brown volumetric flask (5.3), cool to room temperature and set aside. 5 Instruments
5.1 Force-avoiding stirrer;
5.2 Volumetric bottle: 500 ml;
5.3 Brown plate bottle: 100 ml.;
5.4 Graduated pipette: 5 mL, 5 ml.;5.5 Non-graduated pipette: 1 mL, 5 ml;
Approved by the State Administration of Quality and Technical Supervision on October 20, 1998 and implemented on May 1, 1999
5.6 Filter paper: 11 cm fast qualitative shaking paper;
G1/T55501998
5.7 Dispersion tester: Format: 180m×180mm×5m glass-180m190mmX1mm empty grade organic glass (one organic glass with one small hole in the center); 5.8 Second bag:
5. 9 Stainless steel ruler, graduated scale Tm1
5.10 Beaker: 150 ml..
6 Determination steps
Preparation of sample and standard solution of dispersant
Weigh about 0.5% of the sample and standard sample (0.01g) according to the dispersant's dispersing power, and place in 1 beaker. Add water to dissolve and transfer to the scale of the medium (5.2), shake and set.6.2 Preparation of test solution
According to the amount specified in Table 1, use the graduated pipette (5.4) to draw the micro-solution and standard solution (6.[) respectively, and add the specified amount of water and solution to 1.5 beakers (5.10). 3RS wave (4.4), placed on a magnetic stirrer, under the condition of 2:1±2℃ reactant and stirring speed, add sulfuric acid solution (4.) until the color of the secretion liquid is white and clear red, which is the end point. About 4 minutes, stir for 2 minutes. Prepare the solution.
Determination of wave flash preparation
Teaching agent
Quick convex Dongdahui 3RS braid liquid
Sulfur acid liquid
Overall standard
Note that the absorbed flash test area can be synchronized with the test medium and the droplet density of the filter paper diffusion permeability diagram of 6.3
Two filter papers are placed between the glass blocks of the dispersion measuring instrument () at 0° in the longitude and latitude directions, and the filter center and the organic glass plate are combined. Use a non-divided pipette (5, absorb 1.4 ml of the measuring liquid in the middle of the ene cup. Continue to absorb it into the small hole in the center of the glass cup (the measuring liquid should not come out of the small hole). The measuring liquid will gradually disperse to form a red seepage circle in the middle. When the last drop of the measuring liquid enters the paper, start timing with a stopwatch. After 2 m, draw a line from the paper and mark the longest diameter of the red seepage circle area. Draw the line in the direction of the line as shown in the figure) 1
7 Calculation and evaluation of dispersion force
CB/T 5550—1998
Calculation of the above values: F value is the average diffusion area parameter of the infiltration pottery, the unit is mm2. Use a ruler (5.9) to accurately measure the D) and n of the red X, and set the value:
D The longest diameter of the red infiltration area mm
… The longest diameter of the red infiltration area mm. Through calculation, we can get the following:
—-solution:
——solution
F—3 solution
,----fluid solution F:
——5 The F value of the tour,
requires that the measured values ​​are clearly divided into grades. That is, F, FFF (1)
the values ​​of the test sample are divided into: the product of the standard sample, and the situation is compared, and it is close to the lower F value. Then the dispersion force of the test sample is calculated by formula (2). If F is close to: value, then the dispersion force value of the test sample is calculated by formula 3. P%
is close to F, then the component force position P of the test sample is calculated by () according to F%)
Similarly, the above values ​​of the test specification are respectively the same as the standard compensation values: F,, When compared, if the value is less than the value of F, then the dispersion force P of the sample is calculated by formula (3):
is close to F. If the component force value P of the sample is calculated by formula (6): P)-
, then the component force value of the sample is calculated by formula (7): P(%)
If F or F is respectively in FF:F, F, the interval between each two levels of F is as close to the level as the permitted value.
The absolute value of the product should be less than % of the product. If the difference with the user value is within the allowable range, the average value of the product is used as the dispersion force of the sample:
If the error is large, the permitted error of this method is exceeded, then the new measurement is performed. Evaluation of dispersibility:
The test dispersibility is (1001)%, and the standard is 100GB/T5550-1998
If the dispersibility of the sample is (103±1), it is evaluated as 105%; if the dispersibility of the sample is between 101% and 101%, it is evaluated as 1(10)~105%. The rest is similar. If the lower value of the sample is not within the F value range of the standard sample, the volume of the sample liquid should be adjusted and re-measured.
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