GB/T 5211.18-1988 Determination of pigment residue on sieve - Water method - Manual operation

GB/T 5211.18-1988 Determination of sieve residue of pigments - Water method - Manual operation GB/T5211.18-1988 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Determination of residue on sieve of pigments-Water method---Manuai procedureUDC 667.622:667
GB 5211.18--88
This standard refers to the international standard ISO787/7-1981 "General test method for pigments and extenders-Determination of residue-Water method-Manuai procedure". 1 Subject content and scope of application
This standard specifies the general test method for the determination of residue on sieve of pigments and extenders dispersed in water. When this general method is not applicable to a specific product, a special method should be specified to determine the residue on sieve. 2 Referenced standards
GB 6003 Test sieves.
3 Instruments
Part 7: Sieve
3.1 Sieve: The nominal aperture meets the requirements of GB6003. The diameter and nominal aperture of the sieve used shall be indicated in the test report. Note: The aperture of the sieve is usually 45μm. It is recommended to check the aperture regularly with a microscope or magnifying glass to determine whether the hole is blocked and excessively worn. If the hole is damaged, the sieve should be scrapped. 3.2 Brush f: Made of pig, the size is about 5mm thick, 20mm wide and 35mm long. 3.3 Glass filter (or weighing bottle): filter hole diameter 16~40μm. 3.4 Oven: can be maintained at 105±2℃.
3.5 Mechanical stirrer: speed 500±50r/min. The stirring head is made of a copper rod with a diameter of about 40mm. It has four equal sections, and the cut section is horizontally rotated 30° upward. 4 Test steps
Carry out parallel determination of two samples.
4.1 Sample
Weigh 10g of the sample, accurate to 0.01g, and place it in a beaker of appropriate capacity. 4.2 Preparation of dispersion
In the beaker containing the sample (4.1), add 50mL of distilled water and a suitable dispersant, and stir it under a mechanical stirrer (3.5) for 20 minutes.
Note: The type and amount of the dispersant should be specified by the relevant product standards and indicated in the test report. It should be ensured that the obtained dispersion does not have any flocculation phenomenon. 4.3 Determination
Pour the dispersion through the sieve (3.1), rinse the beaker with the solution used to disperse the sample until the rinse liquid passing through the sieve is clear and does not contain the dispersion. The rinsing time for each time should not exceed 10 minutes. Finally, use a brush (3.2) to brush the particles adhering to the sieve wall into the sieve, and rinse the residue on the sieve with distilled water until there is no dispersant. Note: In order to avoid erroneous test results, the rinse liquid must be filtered through a suitable filter. Treat the residue in any of the following ways: Approved by the Ministry of Chemical Industry of the People's Republic of China on August 1, 1988 1220
Implementation on April 1, 1989bzxZ.net
GB 5211.18-88
Rinse the sieve residue into a glass filter (3.3) that has been previously heated and weighed in an oven at 105±2℃, and dry it in an oven at 105±2℃ for 1h. After cooling in a desiccator, weigh it to an accuracy of 1mg. Continue heating in an oven at 105±2℃ for at least 30min, and repeat the above operation until the difference between two consecutive weighings is no more than 5mg. Record the smaller mass. b.
Use distilled water to transfer the sieve residue into a 50mL beaker that has been previously heated and weighed at 105±2℃ and evaporate to about 1, and dry it in an oven at 105±2℃ for 1h. Continue the subsequent operation as described in a. Continue. c. Bake the sieve residue in a 105±2 (oven for 1h, transfer the sieve residue to a weighing bottle (3.3) that has been pre-heated and weighed in a 105±2 (oven) and weigh it to an accuracy of 1mg, continue to heat it in a 105±2 (oven for 30min, cool it in a desiccator, cover it and weigh it again to an accuracy of 1mg. Repeat this operation until the difference between two consecutive weighings is no more than 5mg, and record the smaller mass. If the difference between the measured values ​​of the two samples is less than F5mg, use it as the value for calculation: if the difference is greater than 15mg and greater than 10% of the larger value, repeat the entire test procedure (Chapter 4).
4.4 Inspection of sieve residue
Inspect the sieve residue for incompletely dispersed pigments and body pigments. If there are more incompletely dispersed materials, repeat the entire test procedure (Chapter 4) with other wetting and dispersing agents. If the sieve residue contains foreign matter, its presence and properties should be recorded. 5 Expression of results
The formula is: R--sieve residue expressed as a mass percentage, mo-
-mass of the sample, g
-mass of the sieve residue, g.
100×ml
Calculate the average of the two measured values ​​and report the result to two significant figures. If the average value is less than 0.01%, then The report result is "minimum F0.01%".
Test report
The test report shall at least include the following contents: type and name of the test pigment,
test results expressed in Chapter 5;
aperture of the sieve used;
name and quantity of the dispersant:
type and state of the sieve residue;
difference from the prescribed operation,
test date.
Additional remarks:
This standard is under the jurisdiction of the National Technical Committee on Standardization of Coatings and Pigments. This standard was drafted by the Shanghai Coatings Industry Research Institute. The main drafter of this standard is Zhang Wenyun.
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