Study On Modification Of Organic Silicon Resin Magnesium Hydroxide

Inorganic magnesium hydroxide has the merits of non-toxic,smoke suppression and good thermal stability.During its decomposition upon heating,it not only does not produce corrosive gases,but also the formation of Mg O can neutralize the acid and corrosive gas.As a kind of environmental-friendly additive flame retardant,it can be used in a vast market.However,the compatibility and dispersibility of magnesium hydroxide and polymer materials give a poor account.Adding magnesium hydroxide to the polymer materials often seriously affects the mechanical properties and processing properties of the materials.Therefore,it is significant to improve the compatibility and dispersibility between inorganic magnesium hydroxide and polymer materials.This paper focused on problems above,choosing the octadecyl acrylate and KH-570 to produce the modified resin by free radical copolymerization.Then the magnesium hydroxide was modified with the silica-C resin prepared.The characterization through the scanning electron microscopy,infrared spectroscopy,transmission electron microscopy,laser particle size analyzer and thermogravimetric analysis helped us find that the powder particles were more uniform after the modification of the powder by the silica-C resin.The particle size of the particles was uniform,but the addition of the silica-C resin will also slightly exacerbate the agglomeration of MH powder.The smallest particle size of MH powder which presented the best effect of modification will be made in the silicon-acrylic resin content of 3%.Then as a blend,the composite materials can be melted by the modified magnesium hydroxide and low-density polyethylene,ethylene-vinyl acetate copolymer,polyvinyl chloride.Compared with the unmodified magnesium hydroxide / polymer matrix composites,it was found that the tensile strength and elongation at break of the modified magnesium hydroxide / polymer matrix composites were significantly improved,and the inorganic hydroxide Compatibility and dispersibility between magnesium and polymer materials as well.