The application of mica powder in coatings is mainly reflected in the following aspects:
1. Blocking effect The lamellar fillers form a basically parallel orientation arrangement in the paint film, and the penetration of water and other corrosive substances into the paint film is strongly blocked. When high-quality sericite powder is used (the diameter thickness ratio of the chip is at least 50 times, preferably more than 70 times), the penetration time of water and other corrosive substances through the paint film is generally extended by 3 times. Because sericite powder filler is much cheaper than special resin, it has very high technical and economic value. The use of high quality sericite powder is an important means to improve the quality and performance of anti-corrosion coatings and exterior wall coatings. During the coating process, the sericite chips lie down under the effect of surface tension before the paint film is solidified, and automatically form a structure that is parallel to each other and the surface of the paint film. With such layer by layer arrangement, its orientation is just perpendicular to the direction of corrosive substances penetrating the paint film, so the barrier function is most fully played.
2. To improve the physical and mechanical properties of the paint film, sericite powder can improve a series of physical and mechanical properties of the paint film. The key is the morphological characteristics of the filler, that is, the diameter thickness ratio of the sheet filler and the length diameter ratio of the fibrous filler. The granular filler, like the sand and stone in the concrete, plays the role of reinforcement.
3. The hardness of the resin itself is limited, and the strength of many fillers is not high (such as talc). On the contrary, sericite is one of the components of granite, with high hardness and mechanical strength. Therefore, adding sericite powder as filler in the coating can significantly improve its anti-wear performance. Sericite powder is mostly used for vehicle coatings, road coatings, mechanical anti-corrosion coatings and wall coatings.
4. Insulating property Sericite has extremely high resistance, and is itself the most excellent insulating material. The compound formed with organic silicon resin or organic silicon boron resin can be transformed into a ceramic material with good mechanical strength and insulation performance when encountering high temperature. Therefore, the wires and cables made of this kind of insulation material will remain in the original insulation state even after being burned in the fire. It is very important for mines, tunnels, special buildings, special facilities, etc.
5. Flame retardant sericite powder is a valuable flame retardant filler. If it is mixed with organic halogen flame retardant, flame retardant and fire retardant coatings can be prepared.
6. Anti ultraviolet and infrared ray properties Sericite has excellent performance of shielding ultraviolet and infrared ray. Therefore, adding wet sericite powder in outdoor coatings can greatly improve the UV resistance of the paint film and delay the aging of the paint film. Its infrared shielding performance is used to prepare thermal insulation materials (such as coatings).
7. Thermal radiation and high temperature coating sericite have good infrared radiation ability. If it is combined with iron oxide, it can cause excellent thermal radiation effect.
8. Sound insulation and shock absorption sericite can significantly change a series of physical moduli of materials, forming or changing the viscoelasticity of materials. Such materials efficiently absorb vibration energy and weaken vibration wave and sound wave. In addition, the vibration wave and sound wave form repeated reflection between mica chips, which also weakens their energy. Sericite powder is also used to prepare sound attenuation, sound insulation and shock absorption coatings.
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