The Study Of Halogen-Free And Non-Phosphorus Modified Magnesium Hydroxide Flame-Retardant EVA

Ethylene-vinyl acetate copolymer (EVA) is one of the plastic products developed rapidly in recent years, It has good flexibility, impact resistance, resistance to environmental stress. It can be better mixed capacitive with fillers and flame retardants.However the Ethylene-vinyl acetate copolymer (EVA) is a more flammable matiral. Also produce toxic gas with smoke, limit its appliance, construction, building materials, cable insulation and other applications. Therefore, the flame-retardant EVA increasingly a cause for concern and attention.Magnsim hydroxide can be said to have recognized the current fill, flame retardant and smoke suppression of the triple function of chemical additives. Compared to other flame retardants, their applications in polymer materials can not only achieve excellent flame retardant effect, but also have a good smoke suppression effects, and non-toxic, non corrosive and low-cost advantages. It compounded with various ingredients, but also has anti-acid, can be generated in the combustion process and the acidic and corrosive gas, is an environmental friendly green flame. However, compared with magnesium hydroxide flame retardant EVA based material to add large, flame-retardant efficiency is high, but a great impact on their mechanical properties, the research of modified magnesium hydroxide is still the most important issure. The paper reports on the basis of existing literature. Complex technology, coupling technology and intercalated graft technique, three complex technology are used to modify Magnsim hydroxide. And add two compatibilizers, which are EVA-D4085 and maleic anhydride grafted EVA. of the preparation process and the modification on the EVA performance.the performance including flame-retardant properties, mechanical properties, thermal properties, moisture absorption properties.In this paper, the study of Magnesium hydroxide flame retardant EVA is more specific. Different ratio of purity magnesium hydroxide (not by any treatment) mixed with EVA mixing are used. The results show that The vertical combustion of flame retardant composite wants to achieve UL V-0, the amount of retardant required more than 65% are added, At this time the elongation rate is only 11.32%.And with 10% compatibilizer maleic anhydride grafted EVA. The elongation can increace up to 31.5%; Different proportions of magnesium hydroxide by the silane coupling agent treatment, then mixed in with EVA, The results show that the elongation at break of the Flame-retardant composite are slightly improved; Modified magnesium hydroxide and modified zinc borate flame retardant EVA Collaborative show that When the mass ratio of zinc borate modified by 10%, The modified magnesium hydroxide flame retardant EVA synergistic mechanical properties, flame retardancy, heat resistance are improved;The performance of APP with the modified magnesium hydroxide flame retardant EVA collaborative research show that When the flame retardant 60%, Compatibility agent was 10%, Vertical burn up to V-0 level, however, elongation rate of about 28%, serious impact on the mechanical properties of flame retardant composites.The silane coupler KH-550 was anchored on the MH surface and TGIC grafted MH flame retardant was prepared by polymerization. Preparation technology of grafted MH was investigated, Adding different proportions of compatibilizer,The modification effect of ethylene vinyl acetate(EVA) material on flame retardant properties and mechanical properties was studied. The results show that reaction conditions should be carefully selected in preparation of TGIC grafted MH. The material properties of the vertical combustion can be improved. TGIC grafted MH could be better dispersed in EVA and increase the flame retardant properties, In the flame retardant addition level of 60%, the UL 94 retardant degree was increased from V-1 to V-0. the mechanical properties was greatly improved.According to the special layered structure itself of Magnesium hydroxide, The paper also uses zinc borate modified technique.By different material of the reaction of boric acid and zinc oxide, With laser particle size analyzer and high scanning microscope (SEM) characterization of the surface properties of magnesium hydroxide, a zinc borate intercalation of magnesium hydroxide flame retardant was prepared.The preparation of Zinc borate intercalation of magnesium hydroxide was studied. ntercalated investigated the flame retardancy of the EVA, mechanical properties, thermal properties was studied too.The results show that: When the dosage of 63% in the flame retardant, zinc borate mofication of magnesium hydroxide flame retardant in the EVA can achieve UL V-0, adding compatibilizer, the mechanical properties was better.