Fluorescent pigments: Organic fluorescent pigments are also called daylight fluorescent pigments. After absorbing visible light and ultraviolet light, they can convert ultraviolet fluorescence that cannot be sensed by human eyes into visible light of a certain color. The total reflection intensity is higher than that of ordinary colored pigments. Fluorescent pigments are widely used in plastics, coatings, printing and dyeing industries with their bright colors. They are generally applied to safety passages, safety doors, fire fighting equipment, traffic signs, etc.
Temperature indicating pigments: namely color changing pigments. Use color-changing pigments to make color paint, and paint it in places where it is not easy to measure temperature changes, and you can observe temperature changes from the changes in paint film color. There are two types of temperature-indicating pigments. One is reversible color-changing pigments, that is, the color changes when the temperature rises, and then returns to the original color after cooling. The other is irreversible color pigments, which undergo irreversible chemical changes when heated, and cannot return to their original colors after cooling. Paints that use temperature-indicating pigments are temperature-indicating paints. Because the paint contains temperature-sensitive pigments, the color changes when the coating film is heated to a certain temperature. The advantage of the temperature-indicating paint is that it is suitable for occasions where the temperature cannot be measured. It can measure the surface temperature distribution and is easy to use without any equipment. The disadvantage is that it is limited by the conditions of use and poor accuracy.
Metallic pigments: These are pigments made by grinding metal or alloy particles or flakes. They have metallic luster and are widely used as decorative paints in the coating industry. The main varieties are aluminum powder, copper powder, zinc powder and stainless steel powder. Among them, the amount of aluminum powder is the largest, and the amount of copper powder is less than that of aluminum powder, and the light reflection intensity is slightly lower than that of aluminum powder. Aluminum powder, zinc powder and stainless steel powder all have anti-corrosion effects, and aluminum powder has better decorative properties. Most metallic pigments are flake-like powders. The metallic flakes block the fine pores of the film-forming material, prevent harmful external gases or liquids from penetrating the coating film, and protect the coating film and the coated articles. Metal powder can reflect more than 60% of the ultraviolet rays in the sunlight, so it can prevent the coating film from aging due to ultraviolet light, which is beneficial to prolong the life of the coating film.
Anti-rust pigment: This is a kind of pigment not used for coloring but used to prepare anti-rust paint. It protects the metal surface from corrosion and improves the protective effect of the paint film on the metal surface. Anti-rust substances, such as red lead powder, iron red powder, composite iron titanium powder, aluminum zinc tripolyphosphate powder, etc., are collectively referred to as anti-rust pigments. The anti-rust pigments used in traditional coatings are mostly pigments containing chromium, lead, and cadmium, such as red lead, lead powder, and chromates of zinc, barium, and lead. Although the paints prepared by them have good corrosion resistance, However, it is toxic in itself and will pollute the environment and endanger health during production and use. Many countries have strictly restricted its use. With increasing attention to environmental protection, new types of environmentally friendly anti-rust pigments are emerging in endlessly. Among them, molybdate anti-rust pigments have better development prospects. They can passivate with the surface of steel and promote the formation of passivation layer on the surface of steel. A modified iron oxide coating with excellent adhesion. The development of new environmentally friendly and pollution-free anti-rust paints has become one of the development trends. For example, a variety of non-toxic and efficient anti-rust paints such as phosphate, molybdate, borate and flake pigments have been developed, which are suitable for various solvent-based Anti-corrosion paint, anti-corrosion paint, underside all-in-one paint, free of harmful heavy metals such as lead and chromium, can replace traditional anti-rust pigments such as zinc chrome yellow, zinc phosphate, aluminum tripolyphosphate, etc., significantly reducing costs and ensuring product quality.
Antifouling pigments: there are two commonly used cuprous oxide and mercury oxide. Cuprous oxide is a reddish or purple-red powder, usually made by oxidation of fine copper powder. Products with higher purity can be made by electrolysis. It is a common antifouling paint pigment. The anti-fouling paint prepared with it is painted on the bottom of the ship, which can effectively prevent marine organisms from attaching and breeding on the bottom of the ship. Mercury oxide is a powder with red or orange color. As an antifouling pigment, it is often used in conjunction with cuprous oxide, which has a significant antifouling effect. Since mercury can cause public hazards, it has been used as little or not as possible.
High-temperature resistant pigments: In the coating industry, high-temperature resistant pigments refer to those special high-temperature resistant coatings that can be used for high-temperature baking coatings resistant to 200 to 300 ℃ and resistant to above 400 ℃ (such as silicone coatings, inorganic polymer powder coatings and aluminum powder coatings) Etc.) of the pigment.