In the coating industry, silica powder has the characteristics of high whiteness, high hardness, low thermal conductivity, high temperature resistance, stable insulation and chemical properties, which can effectively improve the corrosion resistance, wear resistance, insulation and high temperature resistance of the coating. Especially for exterior paints, silica powder plays a decisive role in weather resistance.
The spherical silica powder has strong ultraviolet absorption and infrared reflection characteristics, which can increase the anti-UV aging and heat aging properties of the coating; when added to the UV-curable coating, the hardness and adhesion of the coating can be obviously improved, and the UV absorption is weakened. The degree of radiation, which reduces the rate of cure of UV curable coatings.
The spherical silica powder has a large specific surface area and exhibits great activity, good flow and lubricity, and can form a network structure when the paint is dried. At the same time increase the strength and smoothness of the coating, improve the suspension of the pigment, and keep the color of the coating unchanged for a long time.
Lianyungang CT silica powder product picture
What are the specific applications of silica powder in coatings?
Latex coating: Wang Pengzhu and others compound with modified silica powder and titanium dioxide. When silica powder: titanium dioxide = 1:3, the composite powder has good dispersing properties and is used in latex coatings. It shows excellent mechanical properties after the addition of the modified silica powder coating film, the silica powder is mainly concentrated on the surface layer of the coating film, which improves the hardness and stain resistance of the coating film.
Powder coating: Du Zhongyan replaces titanium dioxide by adding silica powder. When the ratio of the two is 1:1, the coating performance of the powder coating is the best. The pencil hardness is 4H, the impact resistance is higher than 50kg.cm, and the gloss is high 75%, whiteness 82%.
High-temperature wear-resistant coating: Zhang Dongdong and others silica powder modified with silane coupling agent KH560, which improves the compatibility of epoxy resin, has good dispersibility in coating, and can obtain silica powder/ring with good wear resistance and heat resistance. Oxygen resin high temperature wear resistant coating.
In recent years, with the development and application of various special functional coatings, silica powder has attracted more and more attention from coating users due to its excellent properties such as temperature resistance, weather resistance, wear resistance and corrosion resistance.
It is worth noting that although China's spherical silica powder products can compete with foreign products in terms of physical and chemical indicators, there is still a long way to go in the control of production automation, on-line testing methods and stable product quality.