Application of mica powder
The insulation property of Sericite is very high. It is the most excellent insulating material. The formation of complexes with silicone resin or silicone resin boron, meet high temperature is converted into mechanical strength and insulating ceramic material with good performance, so this kind of insulated wire and cable material, even after burned in the fire, still maintain the original state of the insulation. It is very important for mines, tunnels, special buildings, special facilities, etc..
To improve the abrasion resistance of the film, the hardness of the resin itself is limited, and the strength of many fillers is not high (such as talcum powder). In contrast, sericite is one of the components of granite with great hardness and mechanical strength. Therefore, when the sericite powder is used as filler, the abrasion resistance of the coating can be obviously improved. Most of the automotive coatings, pavement coatings, mechanical anticorrosive coatings and wall coatings are mostly made of sericite powder.
To improve the physical and mechanical properties of the film, the use of sericite powder can improve a series of physical and mechanical properties of the film. The key is the morphological characteristics of the filler, that is, the diameter thickness ratio of the packing and the ratio of length to diameter of the fiber packing. The particle packing acts as the sand and gravel in the concrete and plays the reinforcing role of the reinforcing steel bar.
The barrier effect of flake filler are formed substantially parallel to the orientation in the film, water and other corrosive substances on the film has a strong barrier, in the use of high-quality mica powder case (wafer diameter thickness ratio of at least 50 times, preferably more than 70 times), water and other corrosive substances penetrate the film through time generally 3 times longer. Because sericite filler is much cheaper than special resin, it has very high technical value and economic value. The use of high-quality sericite powder is an important means to improve the quality and performance of anticorrosive coatings and exterior wall coatings. In the process of coating, the mica wafers lie under the surface tension after the film is solidified, forming a structure parallel to each other and parallel to the surface of the film. In this way, the orientation of the layer is just perpendicular to the direction of the film passing through the corrosive substance, and the blocking effect is most adequate.
Flame retardant sericite powder is a valuable flame retardant filler. It can be used as flame retardant and fireproof paint if it matches with organic halogen flame retardant.
