GB/T 5211.6-1985 Determination of acid resistance of pigments

GB/T 5211.6-1985 Determination of acid resistance of pigments GB/T5211.6-1985 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Method for the determination ofresistance to acid of pigmentsThis standard is a general test method for pigments, used to determine the acid resistance of pigments. 1 Definition
UDC 667.622
:667.613.5
GB 5211.6--85
When pigments come into contact with acid solutions, the action of pigments and acids will cause staining of acid solutions and discoloration of the pigments themselves. The acid resistance of pigments refers to the performance of pigments in resisting the action of acids to cause staining of acid solutions and discoloration of pigments. 2 Materials and instruments
2.1 Hydrochloric acid GB622-~77: chemically pure, 2% solution. 2.2 Days and a half: sensitivity 0.001g.
2.3 Test tube: capacity 25ml, with ground stopper. 2.4 Electric oscillator: oscillation frequency 280±5 times/min, oscillation amplitude 40±2mm. 2.5 Filter paper: slow speed, should comply with the provisions of GB1915-80 "Qualitative filter paper". 2.6 Fine pores: capacity 25ml. bzxZ.net
2.7 Filter bottle: capacity 125ml.
2.8 Colorimetric ml: thickness 0.5cm, height 6.4cm. 2.9 Colorimetric stand: The colorimetric stand should have two holes, which are easy to insert the "" colorimetric III, and the background should be white. 2.10 Gray grading card: Use the gray grading card for staining of GB251-84 "Gray sample card for evaluating staining" and the gray grading card for fading of GB250-84 "Gray sample card for evaluating discoloration". 3 Determination steps
A parallel test is required.
3.1 Preparation of test solution and filter cake
Weigh 1 portion of pigment sample, 0.5 g each, accurate to 0.001 g, and place them in two test tubes (2.3), add 20 ml of distilled water to one of them and 20 ml of hydrochloric acid solution (2.1) to the other. After leaving for 5 minutes, cover with ground stopper, semi-fix the water on the electric turbulent (2.4), shake for 5 minutes, remove, and pour into the fine-pore crucible (2.6) covered with 3 layers of filter paper (2.5), and vacuum filter until clear filtrate is obtained.
3.2 Evaluation of staining and discoloration levels
3.2.1 Fill the cuvettes (2.8) with 2% hydrochloric acid solution (2.1) and the clear filtrate respectively, and place the two cuvettes in the holes of the colorimetric rack (2.9) respectively. 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, visually evaluate the staining level of the filtrate by comparing it with the staining gray grading card (2.10). 3.2.2 Take out the filter cakes in the two crucibles after filtration respectively, place them on a white porcelain plate, press on a colorless glass, and visually evaluate the discoloration level of the pigment by comparing it with the fading gray grading card (2.10) in the same way as in 3.2.1. 3.3 Parallel test results
The levels obtained by parallel tests should be the same.
National Bureau of Standards 1985
-16 Issued
1986-0301 Implementation
4 Result Expression
GB 5211.6-85
The acid resistance of the pigment is expressed by the staining level of the filtrate, the color change level of the filter cake, or the color change level of the filtrate and the filter cake at the same time. The best filtrate staining and filter cake color change is level 5, and the worst is level 1. The filtrate staining degree is between the two levels and is expressed as 4-5, 3-4, 2-3, and 1-2. The filter cake color change degree is between the two levels and is expressed as 4/5, 3/4, 2/3, and 1/2. If the levels of the filtrate staining degree and the filter cake color change degree are expressed at the same time, it is expressed as A [B], A represents the filtrate staining level, and [B] represents the filter cake color change level.
Note: For example, if the staining of a certain material filtrate is level 5 and the color change is 4/5, it is expressed as 5【4/5】. 5 Test report
The test report should include the following contents:
The type and name of the test sample,
The acid resistance level of the obtained pigment;
Abnormal phenomena that occurred during the test,
Test date and test personnel.
Additional notes:
This standard was 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 Working Group 3 of the Standard Technical Committee for Pigment Inspection Methods. The main drafters of this standard are Gao Jinglin, Huang Jinhan and Xu Peiwen. 1191
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