Selection of raw materials for hot-melt coatings
Selection of raw materials for Guizhou marking paint:
1. The raw materials composed of hot melt coatings are summarized as film forming, secondary film formation, auxiliary film forming, or even more than a dozen. Select the appropriate ratio of raw material according to specific application conditions of hot coating, directly affects the quality of coating.
2. The synthetic resins used in hot-melt coatings are mostly used in petroleum resin, because the cost of the petroleum resin is low and the color and lustre is shallow, and it is easy to make the hot-melt paint with bright color. The petroleum resin can be divided into C5 series and C9 series according to the synthetic process of oil and natural gas. The C5 series is better than the C9 Series in terms of adhesion and other use, and does not have a special irritant smell of the C9 series. So the C5 Series in petroleum resin is the most widely used.
3, a white pigment used in hot melt coating of titanium dioxide, there are several Zinc Oxide, lithopone. The chemical properties of titanium dioxide are stable, with strong covering power and coloring ability, and good light resistance, heat resistance, dilute acid resistance and alkali resistance. For the application in outdoor road marking paint, rutile titanium dioxide anatase titanium dioxide is more resistant to ultraviolet radiation, no discoloration, strong light and weather resistance.
4, the main yellow pigments are mainly lead chrome yellow (chrome yellow, Jie Gehuang), strontium yellow, yellow and some organic yellow pigments. Lead chrome yellow yellow pigment is the main body, wherein the orange chrome yellow has good covering power, light resistance, heat resistance.
5. Packing is an important part of hot-melt coating. It has a great connection to the wear resistance and durability of the hot-melt coatings. The heavy body calcium carbonate is not known as the big white powder. In the hot-melt paint, it mainly increases the mechanical strength and wear resistance of the coating. Quartz powder is made of quartz stone with good wear resistance.
6. The application ratio of hot melt coating additives is very small, but it is very important to the performance of the coatings. The proper use of UV additives can effectively absorb the ultraviolet light from the film and increase the anti cracking, photochemical and anti discoloration properties of the coating. UV - P ultraviolet absorbents are light in color, strong in absorbability and heat-resistant themselves. They are more suitable for hot melt coatings.
7, glass beads as reflective materials we mainly use cheap ordinary silicate products. In practical application, according to the different types of glass beads, two kinds of application methods are divided into internal mixing and spreading.