This method is based on the determination of the weight of paint required to completely cover a 1 m² base of color.
When measuring the hiding power according to this method, on one side of a white glass plate with a size of 50x100 mm and a thickness of about 2.5 mm, use a thicker oil-based paint in parallel, except for two lengths that are the same as the plate painting and width Each strip is 13 mm wide, and the part above the broken glass plate and the part where the hair is removed is painted with black paint. light Prussian red) glass plate; to measure painted paint, a broken glass plate coated with black and white stripes (M-1 Zinc White) shall be used; to measure blue paint, a glass plate except for self-striped and red The red paint uses a gold glass plate with black and white stripes. After the glass plate is prepared, the tested pigment and natural hot oil are ground to a suitable condition for construction, that is, the color paint for construction is made.
Put the prepared board on an industrial balance and weigh it, then move the brush in the direction perpendicular to the color bar, so that the tested color paint will cover the painted board surface with a uniform thickness. After that, Weigh the weight of the test panel, and measure the weight of the color paint used according to the difference of the second weight. When the color paint is dry, remove the test panel again, and leave an unpainted area of 20x50 mm on the first layer. Paint part (relevant instrument: hiding power board)
In order to speed up the test work, it is recommended to pre-prepare a large number of glass plates except the color strip,
By weighing, measure the weight of the color paint consumed on the second layer, after the second layer is dry, apply the third layer, and leave an unpainted part with an area of 30x50 mm on the second layer, the first The three layers must be painted to the thickness that can completely cover the color stripes (Figure 12 see 461 true), and then weigh the test panel to measure the weight of the color paint consumed on the third layer. (Related instrument: Drying time Tester )
The speed difference force can be measured according to the amount of paint consumption applied on the colored bottom surface of 1㎡ according to the following formula:
