latex paint requires coloring pigments, covering power, coloring power, alkali resistance, light resistance, weather resistance, non-toxic and pollution-free. The following will analyze and discuss the requirements of pigments for latex paint from the above aspects.
Color: One of the main functions of latex paint is to give color to the surface of the coated object. The color of the coating is mainly provided by pigments. The color should meet the user's requirements. Users have strict requirements on the color of the coating, so the color properties of the pigment are very important.
hood: The covering force of a pigment refers to the ability of the pigment in the coating film to cover the coated surface so that it cannot be exposed after applying a colored paint on an object. The mass (g) of the pigment required to cover an area of 1m2 is commonly expressed in unit g/m2. The higher the hiding power of the pigment, the less the relative amount used in the color paint, and the better the balance of the comprehensive performance indicators of the color paint. For pigments with higher prices, the combination of the unit price of raw materials and the actual amount of the same hiding force can reflect its real raw material cost.
Coloring power: The coloring power of a pigment is also called the coloring intensity. It is the ability of one pigment to show its own color when mixed with another pigment. The coloring power of colored pigments and black pigments to white pigments is usually measured based on white pigments. Since the pigment's coloring power is obtained based on standard detection methods and the coloring power of its own standard samples, they are all represented by "%". Obviously, the higher the pigment, the better.
Light resistance and weather resistance: The light resistance and weather resistance of pigments are an important indicator to measure the applicability of pigments in outdoor paints. Light resistance mainly refers to the ability of pigments to resist UV light damage. The light resistance of the pigment is measured by standard methods by making it into a coating film and irradiating with natural or artificial ultraviolet light. The light resistance rating is expressed as 1 to 8 levels, 8 is better and 1 is worse. The external latex paint requires that the coloring pigment used is at a light resistance of level 7 or above. Weather resistance refers to the ability of pigments to withstand atmospheric erosion. The pigments used for outdoor paint must be subject to long-term erosion of sunlight, rainwater and harmful chemicals in the atmosphere, causing certain changes in the molecular structure of , , causing fading, darkening of colors, and even causing the coating to pulverize, aging, cracking and destruction. The weather resistance of pigments is carried out with reference to the weather resistance experimental method of external latex paint. The weather resistance rating is expressed as 1 to 5 levels, and 5 is better. The external latex paint requires that the colored pigment used has a weather resistance of level 4.5 or above.
alkali resistance: The alkali resistance of pigments refers to the ability of pigments to resist the corrosion of alkaline chemicals. Latex paint is mainly used as architectural paint. Its base material is cement mortar and concrete, which is highly alkaline.
Non-toxic and pollution-free: Pigments should be non-toxic and pollution-free. At present, according to the national regulations on the limit of harmful substances for interior building decoration materials, the pigments used in latex coating should not exceed the standard.
or above are the requirements of latex paint for coloring pigments, and I hope it can help you. If you want to know more about latex paint, you can always follow the editor’s updates!
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