Covering power, also known as covering power or coating power, refers to the ability to cover the rubber background color, and also the ability of colorants to prevent light from penetrating products (the transparency of colorants).For coloredRubber productsThe greater the covering power of the colorant, the better, to prevent the rubber background from revealing, so that the color of the product is not bright.For transparent products, the greater the hiding power, the worse the transparency.The hiding power depends on the difference between the refractive index of the colorant and the refractive index of the raw rubber. The greater the difference, the stronger the hiding power.
Covering power refers to the effect of pigment on lightscatteringAnd absorption results.
Pigment coverageMeans pigments andInking oilGround intoColor paste, evenly painted on the black and white gridSubstrateThe minimum amount of pigment used to make the black and white grids just covered.
Research background
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The influence of rutile content, achromatic power, particle size and dispersity on the covering power of titanium dioxide was systematically analyzed around improving the covering power of titanium dioxide.The results show that particle size (especially D50) has an obvious influence on the covering power of titanium dioxide. With the increase of D50, the covering power gradually decreases, followed by the influence of achromatic power and oil dispersivity on the covering power, and increases with the increase of achromatic power and oil dispersivity. Again, the proportion of particle size less than 1 μ m has an effect on the covering power. When the proportion less than 1 μ m increases to 92%,The proportion of titanium dioxide with hiding power greater than or equal to 82% increased significantly.[1]
Strength determination
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The hiding power of pigments mainly depends on the following properties: (1) refractive index, the larger the refractive index, the stronger the hiding power;(2) The ability to absorb light, the greater the ability to absorb light, the stronger the hiding power;(3)crystallinity，Crystal formThe covering power of the amorphous is weaker than that of the amorphous;(4)DispersityThe greater the dispersion, the stronger the covering power.
With the same weight of coating products, under the same construction conditions, products with high covering power can paint more areas than products with low covering power.To overcome visual inspectionBlack and white gridInaccuracy of hiding powerReflectometerThe hiding power is measured, and the tested samples are divided into different thicknessescoatingTransparentPolyester filmAfter drying, place them on the black and white glass plates and measure their reflectivity respectively. The ratio isContrast ratio, when the contrast ratio is 0.98, it is allcoverThe covering force can be obtained according to the thickness of the paint film.Applicable to white and lightColored paint。[2]
