GB/T 5211.9-1985 Determination of solvent resistance of pigments GB/T5211.9-1985 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of ChinabzxZ.net
Method for the determination ofresistance to solvent of pigmentsThis standard is a general test method for pigments, used to determine the solvent resistance of pigments. 1 Definition
UDC 667.622
:667.613.5
GB 5211.9-85
When pigments come into contact with solvents, some pigments dissolve in the solvents, which will cause the color of the solvents. The solvent resistance of pigments refers to the performance of the pigments in resisting the dissolution of the solvents and causing the color of the solvents. 2 Materials and instruments
2.1 Solvents: All solvents used should be chemically pure. 2.2 Days and a half: Sensitivity is 0.001g.
2.3 Test tube: Capacity is 25ml, with ground stopper. 2.4 Electric oscillator: Oscillation frequency is 280±5 times/min, and oscillation amplitude is 40±2mm. 2.5 Crucible glass filter: No. 5, capacity 30ml. 2.6 Filter bottle: capacity 125ml.
2.7 Colorimetric lⅢl: thickness 0.5cm, height 6.4cm. 2.8 Colorimetric stand: The colorimetric stand should have two holes to just insert two colorimetric blood tubes, and the background should be white. 2.10 Gray grading card for staining: Use the gray grading card for staining in GB251-84 "Gray Sample Scale for Evaluating Staining". 3 Determination steps
It is necessary to conduct parallel tests.
3.1 Preparation of test solution
Weigh 0.5g of the pigment sample, accurate to 0.001g, and place it in a test tube (2.3). Add 20ml of solvent (2.1), plug the tube, fix it horizontally on an electric oscillator (2.4) and oscillate for 1min. Remove it and pour it into a glass filter (2.5). Vacuum filter until a clear filtrate is obtained. Collect the filtrate, dilute it to 20ml with solvent (2.1), shake it well and set aside. 3.2 Evaluation of staining level
Fill the solvent (2.1) and the prepared clear filtrate (3.1) into the cuvette (2.7) respectively, place the two cuvettes in the holes of the cuvette stand (2.8) respectively, and observe it under natural light facing north, with the incident light at a 45° angle to the object being observed and the observation direction perpendicular to the surface of the object being observed. Compare it with the staining gray grading card ( 2.9), depending on the staining level of the filtrate. 3.3 Parallel test results
The levels obtained from parallel tests should be the same.
4 Result expression
The evaluated staining level is directly used to indicate the solvent resistance of the pigment, the best is level 5 and the worst is level 1. The staining level is between the two levels, represented by 4-5, 3-4, 2-3, and 1-2. National Bureau of Standards Issued on July 16, 1985
Implementation on March 1, 1986
Test report
The test report should include the following:
Type and name of the test sample;
Name of the solvent used in the test,
Level of solvent resistance of the obtained pigment,
Abnormal phenomena occurring during the test,
Test date and test personnel.
Additional instructions:
GB 5211.9-85
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China and is under the jurisdiction of the National Technical Committee for Standardization of Paints and Pigments. This standard was drafted by the 7th Working Group of the Technical Committee for Standardization of Pigments Testing Methods. The main drafters of this standard are Yang Xiaoping, Yu Qi and Feng Qizhu. 1197
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