In the early 1990 s, aluminum hydroxide was used as a filler in the production of artificial marble. Becausealuminum hydroxideIt begins to decompose at about 220°C and releases crystal water, so aluminum hydroxide itself has flame retardant properties. In addition, aluminum hydroxide has unique properties, with an average refractive index of 1.57, which is very similar to that of cured resin, resulting in a unique translucent, elegant and luxurious appearance of the composite. At the same time, it has the advantages of high hardness, water resistance, flame retardant, anti-fouling, non-toxic, easy secondary molding, seamless welding, etc., making it a high-grade decorative material and widely used. The quality of aluminum hydroxide as a filler has a significant relationship with the performance and appearance of the composite.

the impact of oil absorption rate:

The oil absorption rate is the main factor that affects the viscosity of the slurry during use. The higher the oil absorption rate of the filler aluminum hydroxide, the greater the viscosity of the slurry during use. Under the same circumstances, the greater the viscosity of the slurry means the addition of aluminum hydroxide. The less the fraction. On the contrary, the lower the oil absorption rate of the filler aluminum hydroxide, the lower the viscosity of the slurry during use, and in the same case, the larger the amount of the added aluminum hydroxide filler. According to some users, the greater the number of aluminum hydroxide filler added, the lower the cost of the product, and the more important is the better the performance of the product, such as higher surface hardness, lower curing shrinkage and thermal expansion coefficient, and higher thermal conductivity. At the same time, it also has the advantages of reducing curing heat release, preventing product cracking, and improving flame retardant performance.

Effect of moisture

The water content of aluminum hydroxide filler will directly affect its performance and the quality of the product. Too high moisture will cause the viscosity of the resin to rise linearly, greatly extending the curing time, which is not conducive to production operations. At the same time, the resin polymerization is incomplete and uneven, which will produce a series of quality problems such as broken board, cracking, and white spots on the surface of the product. In addition, in the production process of aluminum hydroxide, if the drying temperature is too high, it will cause part of the production process of aluminum hydroxide. If the drying temperature is too high, it will cause part of aluminum hydroxide to lose water and decompose, or a hydrothermal reaction occurs, and the crystal structure is destroyed to generate boehmite.

Effect of foreign bodies

At present, a common problem with domestic aluminum hydroxide is that there are many black spots, which is mainly due to the fact that the process of domestic aluminum hydroxide is separated from the alumina production process, and the pollution caused by some industrial production is difficult to avoid. The black spots in aluminum hydroxide products will seriously affect the quality of monochrome products, and the color of dust and semen in the production process will also directly affect the color of the products.