MAGNESIUM HYDROXIDE WITH SURFACE MODIFIED BY SURFACE-ACTIVE AGENT, ITS PREPARATION METHOD AND POLYMERIC COMPOSITE MATERIAL WITH INCREASED FIRE RESISTANCE CONTAINING IT

摘要

The surfactant-treated magnesium hydroxide consists of agglomerates of crystals having diameters of all particles less than 4.0 µm, 50% of the particles having diameters less than 1.4 µm and a specific surface area determined by the BET method of less than 25 m 2 / g . Magnesium hydroxide is a powdered crystalline product having a crystal size determined by X-ray powder diffraction method in the direction of 004 greater than 150 A and less than 500 A, an aspect ratio ranging from 2 to 5, deformation in 004 up to 402. 10exp (-3) and deformation in 110 direction up to 3.0. 10exp (-3). Further described is a process for preparing a surface-treated magnesium hydroxide and a polymeric composite material with improved flame resistance comprising 25 to 75 wt. %, preferably 35 to 60 wt. parts of a thermoplastic material and 75 to 25 wt.%, preferably 65 to 40 wt. magnesium hydroxide, the surface of which is treated with a surfactant and / or which is uniformly mixed with the surfactant.