Types and Selection of Paint Color Paste
Traditional pigments are usually supplied in the state of micro-fine powder, with the advantages of strong versatility, good stability and convenient transportation, etc. The disadvantage is that they cannot be used directly and separately, and often need to be added with dispersant, wetting agent, etc. for strong mechanical grinding, and at the same time, there is more dust when using them, which pollutes the environment and makes it inconvenient to match the color.
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Paint color paste is a kind of colorant used in paint mixing and matching, and is a kind of pigment preparation. It is made of powder pigment, solvent (water or organic solvent), resin, pigment dispersant and many kinds of functional stabilizers through strong mechanical compound processing, which has good dispersion and stability, can flow, and has good compatibility with paints.
Paint color paste is divided into water-based color paste, solvent-based color paste and water-oil color paste. Water-based color paste is a pigment concentrated paste with water as the dispersing medium, which is used to make the pigment fully wetting and dispersing through dispersing agent, wetting agent, stabilizer and other functional agents to optimize the application performance of the pigment and stabilize the effect of the system. Due to the good dispersing performance of water-based color paste, it is more convenient to use than powder pigment, and it will not cause dust pollution. Oil-based color paste will release a lot of toxic solvents like that, which reduces the pollution to the environment, and the use of water-based raw materials, i.e. color paste, can effectively solve the pollution of dust and sewage, and the use of it is convenient and easy to match the color, and it can improve the working efficiency and the application performance of the pigment, such as to improve the spreading of the color, and to effectively prevent the floating color and the It can also improve the working efficiency, improve the application performance of pigment, such as improving the color spreading, effectively preventing the floating color and blooming, etc. Therefore, it is widely used in various industries such as architectural coatings and toys.
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Solvent-based color paste is a pigment paste with organic solvent and resin as the dispersing medium, and the color strength and rheology are strictly controlled. It consists of pigment, oily resin, pigment dispersant, stabilizer, co-solvent and functional additives. The key to choose solvent-based color paste is not only the compatibility between color paste and paint, but also the negative influence on the performance of paint after adding color paste, especially for high-grade industrial coatings. The solvent used in solvent-based color paste and water have a lot of differences, such as volatility, flammability and explosiveness, different solvents have different toxicity, belong to dangerous goods, so the production, sales and transportation of solvent-based color paste need to have the appropriate qualifications before.
Dual-purpose color pastes are pigment pastes that can be used for both water-based paint coloring and paint (solvent-based paint) coloring. Technically, it is not only necessary to solve the problem of compatibility and dispersion of color paste with water-based paint and solvent-based paint, but also to solve the problem of dilution of color paste in water and other organic solvents. The development of this type of color paste is difficult. Therefore, water-oil dual-use color paste in principle refers to the pigment paste used in some water-soluble coatings and some weak polar oily coatings coloring.
Before buying paint color paste, you should know the indexes and shelf life related to paint color paste. Light resistance, weather resistance, color paste fineness, storage stability are all ways to judge the quality of color paste. The color paste produced with first-class technology can still maintain very good fluidity, no precipitation, no delamination even after the warranty period. Some low-quality products, a long time from the expiration of the product has become very thick, no liquidity, so the color paste shelf life is very short. In addition, color paste products are different, the shelf life is also different. Due to the coating of fluorescent resin, the shelf life of fluorescent series of color paste will be shorter than the general water-based color paste. The stability of some special color pastes will also be shortened due to the difficulties caused by the technology. Open the paint color paste drum before use, and carefully check whether the color paste has any lumps, or whether there is any precipitation at the bottom. When you see the color paste has delamination, no fluidity and other obvious conditions, you should contact the color paste manufacturer or distributor in time, do not use it arbitrarily, so as not to cause losses.
Take internal and external wall coatings as an example, the external wall of the building is subjected to sun and rain all year round as well as strong irradiation of ultraviolet light, and some pigments will be fading, yellowing, chalking and other phenomena. When choosing color paste for exterior wall paints, it is necessary to choose the paint color paste with better weather resistance and light resistance. General exterior paint color paste usually use phthalocyanine series and inorganic iron oxide color paste. Iron oxide color paste color phase is darker, not bright enough, but weathering is good, the price is very cheap, in the exterior wall paint is more widely used. Some better performance of organic pigment color paste will also be used for exterior coatings, bright and vivid colors, weathering and light performance can also meet the requirements. However, the price of these color pastes is relatively high. Interior waterborne coatings basically will not be affected by the external climate, in terms of fastness performance of interior paint color paste is not as strict as the exterior paint color paste, but in the color security and environmental protection paint requirements than the exterior paint is much higher. Interior paint color paste to have both to maintain the indoor environment when living in the wall color does not fade not yellow, but also to ensure the safety of human habitation. Color paste must choose harmless, no
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