GB/T 5211.16-1988 Comparison of the tinting power of white pigments GB/T5211.16-1988 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Comparison of lightening power of white pigments
UDC 667.622:667
GB 5211.16-88
This standard is equivalent to the international standard ISO787/17-1973 "General test methods for pigments and body materials Part 17: Comparison of lightening power of self-colored pigments".
1 Subject content and scope of application
This standard specifies the general method for comparing the lightening power of white pigments. This standard is applicable to the comparison of the lightening power of white pigments with pigments of the same type. This standard is divided into method A and method B1).
When this general method is not applicable to a specific product, a special method should be specified to determine the lightening power of white pigments. 2 Reference standards
GB9285 Sampling of raw materials for paints and varnishes 3 Reagents
3.1 Composition of blue paste
Medicinal sesame oil, 500g
Precipitated calcium sulfate (CaSO,·2H20), 475g, ultramarine, 5g,
Modified bentonite, 20g.
3.2 Preparation of blue paste
Put bentonite in a beaker and mix it with enough ultramarine oil to form a uniform slurry. Add the remaining sesame oil under stirring, heat the mixture to 50℃ and keep it warm for 15min, then add ultramarine and calcium sulfate in batches under stirring, use a sand mill to fully disperse the slurry, and stir evenly.
The prepared blue paste is placed in a sealed container for storage. 4 Instruments
4.1 Knife: Made of steel, with a conical blade, about 140-150 mm long, about 20-25 mm at the widest point, and not less than 12.5 mm at the narrowest point. 4.2 Glass plate: Colorless and transparent, with a size of about 150 mm × 150 mm. 4.3 Automatic grinder: The diameter of the frosted glass plate is 180-250 mm, the force applied to the grinder is about 1 kN, and the speed is 70-120 r/min e
4.4 Balance: Accurate to 0.001 g.
Wet film preparation device: Gap 100 μm.
Instructions for use:
1) The difference between this standard and ISO787171973 is that the manual operation method is cancelled. Approved by the Ministry of Chemical Industry of the People's Republic of China on August 1, 1988. Implementation on April 1, 1989. 5 Sampling GB 5211.16-88 Select representative samples of the test pigments in accordance with the provisions of GB 9285. 6 Test procedures 6.1 Method A 6.1.1 Mixing of white pigment and blue paste Weigh 5 g of blue paste (3.1) to an accuracy of 1 mg and place it in the middle of the lower plate of the grinder (4.3). Weigh a certain amount (m2) (accurate to 1 mg) of the standard pigment sample according to Table 1 and place it in the blue slurry. Use a spatula (4.1) to mix it evenly. Divide the slurry into circles with a diameter of about 50 mm from the center of the bottom of the plate on the lower plate. Close the glass plate and apply a force of about 1 kN. Grind it four times, each time for 25 turns. After grinding, save the slurry for later use.
6.1.2 Colorimetry
Treat the test sample (5) in exactly the same way as in 6.1.1 and determine the amount of pigment (m2) required to achieve the color intensity of the standard sample
Use a wet film preparation device (4.5) to scrape the two slurries of the standard sample and the test sample on the glass plate (4.2) in the same direction to form an opaque strip with a width of not less than 25 mm and a contact side length of not less than 40 mm. Immediately after scraping, pass them through the glass plate under diffused sunlight to check the color intensity of the two surfaces. If good sunlight is not available, they can be compared under artificial sunlight. Table 1
Zinc oxide or zinc white
Titanium dioxidewww.bzxz.net
6.2 Method B
6.2.1 Mixture of pigment and blue paste
Weighing sample quantity (m), g
Weigh 5g of blue paste (3.1) to an accuracy of 1mg, and place it in the middle of the lower plate of the grinder (4.3). Weigh the standard sample according to Table 2 to an accuracy of 1mg, place it in the blue paste, and mix it with a spatula (4.1). Divide the paste into circles with a diameter of about 50mm from the center of the bottom of the plate on the lower plate, close the glass plate, apply a force of about 1kN, grind four times, each time for 25 turns, and save the paste for later use after grinding. Weigh the other specified amounts in Table 2 in turn and repeat the above operation. Table 2
Weigh standard samples, g
Zinc oxide or zinc barium
6.2.2 Colorimetry
Titanium dioxide
Treat in the same way as 6.2.1 Weigh the test pigment according to Table 1. Relative tinting power of the sample, %
Select two slurries with the closest color intensity to the test sample slurry from a series of standard sample slurries. 1216
Subtract
GB 5211.16--88
Use a wet film preparation device (4.5) to scrape the test sample and the two selected standard sample slurries on a glass plate (4.2) in the same direction to form an opaque strip with a width of not less than 25 mm and a contact side length of not less than 40 mm. Immediately after scraping, pass through the glass plate under diffused sunlight to check the color intensity of its surface. If good sunlight is not available, the comparison can be made under artificial sunlight. 7. Expression of Results
7.1 Method A
With the standard sample as 100, the relative tinting power of the test sample is: 100m.
Where: mo
7.2 Method B
Mass of the standard sample, g,
Mass of the test sample, g.
7.2.1 From the last column of Table 2, the relative tinting power of the test sample can be read according to the amount of standard sample used when the color intensity of the test sample slurry is equivalent to that of the standard sample slurry.
7.2.2 If the color intensity of the test sample slurry is not completely consistent with one of the color intensities of the standard sample slurry, the interpolation method can be used to estimate the closest relative tinting power between it and the standard sample slurry. 8
Test report
The test report shall at least include the following contents: type and name of the test pigment,
test results expressed in accordance with Chapter 7;
whether method A or method B was used,
differences from the operation specified in this test,
test date.
Additional remarks:
This standard is under the jurisdiction of the National Technical Committee for Standardization of Paints and Pigments. This standard was drafted by Guangzhou Lide Powder Co., Ltd. The main drafter of this standard is Jian Shaode.
No reduction in the production network
Certification of low operation
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