GB/T 5211.10-1985 Determination of paraffin resistance of pigments GB/T5211.10-1985 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Method for the determination of resistence to paraffin of pigments
This standard is a general test method for pigments, used to determine the resistance to paraffin of pigments. 1 Definition
UDC 667.622
: 667.613.5Www.bzxZ.net
GB 5211.10-85
When pigments come into contact with paraffin, some pigments are slightly soluble in paraffin, which will cause paraffin staining. The paraffin resistance of pigments refers to the performance of pigment ink in molten paraffin to resist the dissolution of paraffin and cause paraffin staining. 2 Materials and instruments and equipment
2.1 Blackening oil (made from pure linseed oil): viscosity 2600-2800 cP (25°C); color measured by iron diamond colorimeter according to GB1722-79 "Color determination method for varnish, clear oil and thinner", not more than 8, acid value not more than 8 mgKOH/g. 2.2 Drying oil: off-white paste, made from refined linseed oil, containing diamond, manganese and lead catalysts, fineness not more than 25μ. 2.3 Wax: No. 58, should comply with the provisions of GB254-77 "White paraffin". 2.4 Pictorial printing paper: 100g/m2, should comply with the provisions of QB129-61 "Pictorial printing paper". 2.5 Day: sensitivity 0.001g, 0.2g.
2.6 Syringe: capacity is 1ml.
2.7 Ink: tl carbon steel or spring steel, length 178mm, widest part 18mm, narrowest part 7mm. Beaker: capacity 50ml.
Electric constant temperature water bath: temperature control sensitivity ±1℃. 2.9
2.10 Gray scale for staining: Use the gray scale for staining of GB251--84 "Gray scale for assessing staining". 3 Determination steps
A parallel test is required.
3.1 Preparation of sample paper
Mix the ink oil (2.1) and the drying oil (2.2) in a weight ratio of 85:15, and grind into a slurry according to the second clause of chapter 1 "Preparation of pigment paste" of GB1864-80 "Color determination method for pigments" and the test pigment. Place the prepared pigment slurry on pictorial printing paper (2.4), scrape it into a uniform ink strip, and dry it naturally until it is not contaminated by touching with fingers. Cut the prepared sample paper into 20mm×40mm strips, with the ink part and the ink-free part being 20mm×20mm respectively. 3.2 Liquid wax
Weigh 20g of paraffin wax (2.3), weigh it to 0.2g, put it into a beaker (2.8), and place the beaker in an electric constant temperature water bath (2.9) to heat it. When the wax temperature reaches 80±1℃, immerse the entire sample strip in the molten paraffin wax. After 5 minutes, use stainless steel tweezers to clamp the upper end of the ink part of the sample strip, shake it gently several times, take it out vertically, and wait for the sample paper to cool down for rating. 3.3 Blank test
Take a 20mm×40mm blank paper strip (2.4), perform the waxing operation (3.2), and keep the waxed paper strip for rating comparison. 3.4 Evaluation of color transfer level
Place the wax-impermeable sample (3.1) and the blank sample (3.3) on the Minbao printing paper (2.4). Under natural light from the 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 color transfer level of the part without the National Bureau of Standards promulgated on July 16, 1985
implemented on March 1, 1986
.
3.5 Results of parallel tests
The levels obtained by parallel tests should be the same.
Expression of results
GB 5211.10--85
The evaluated color transfer level is directly used to indicate the paraffin resistance of the pigment, with the best being level 5 and the worst being level 1. The staining level is between the second level and is indicated by 4~5, 3~42~31~2. 5
Test report
The test report should include the following contents:
Type and name of the test sample;
The level of paraffin resistance of the obtained pigment;
Abnormal phenomena occurring 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 the 6th Working Group of the Standard Technical Committee for Pigment Inspection Methods. The main drafters of this standard are Yang Xiaozang and Wang Ziyou. 1199
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