Aluminum hydroxide powder with organically modified surface and preparation method thereof

Abstract

The surface organic modified aluminum hydroxide powder comprises an aluminum hydroxide raw material and a modifier which are mixed into a whole, the modifying agent is prepared from one or more of gamma-glycidyl ether oxypropyl trimethoxy silane, gamma-methacryloyloxy propyl trimethoxy silane, bis-[gamma-(triethoxy silicon) propyl] tetrasulfide, vinyl trimethoxy silane and vinyl triethoxy silane, and the concentration of the modifying agent is 40 percent to 50 percent; the preparation method of the surface organic modified aluminum hydroxide powder comprises the following steps: S1, spraying and mixing; s2, heating and mixing; and S3, discharging and packaging. According to the invention, after the aluminum hydroxide powder and the silane modifier are fully mixed, the surfaces of the aluminum hydroxide powder particles are subjected to organic treatment, so that hydrogen bonds are not easy to form among the aluminum hydroxide particles, and the problem of polar agglomeration among the aluminum hydroxide powder particles is avoided; therefore, more aluminum hydroxide powder can be added into the composite material, and the effect of improving the flame retardant property of the composite material is enhanced.

Description

technical field [0001] The invention belongs to the technical field of powder surface treatment, in particular to a surface organically modified aluminum hydroxide powder and a preparation method thereof. Background technique [0002] Because of its good flame retardant properties, aluminum hydroxide powder can effectively improve the flame retardant level of the polymer material by compounding with the polymer material, thereby preparing a high flame retardant and environmentally friendly polymer composite material. [0003] Due to the strong polarity and hydrophilicity of aluminum hydroxide powder, dispersibility (uneven surface, graininess, mesh blocking) tends to occur in the case of high filling ratio with high flame retardant requirements in application. , The problem of processability (sticking to the roll, difficult to demold) will affect the overall performance of the polymer material due to the polar agglomeration of the ultra-fine particles of the aluminum hydroxi...

AI Technical Summary

Problems solved by technology

[0003] Due to the strong polarity and hydrophilicity of aluminum hydroxide powder, in the application, in the case of high filling ratio with high flame retardancy requirements, dispersion (uneven surface, grainy feeling, network blocking) often occurs , the problem of processability (roller sticking, difficult demoulding) will be affected by the polar agglomeration of ultra-fine particles of aluminum hydroxide powder, which will affect the overall performance of polymer materials

It is precisely because of this characteristic that the amount of aluminum hydroxide powder added is limited. For a given polymer, the flame retardant performance of the composite material is proportional to the amount added, thus restricting the improvement of the flame retardant performance of the composite material.

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