【作者】 霍蛟龙；

【导师】 虞鑫海；

【作者基本信息】 东华大学 ， 应用化学， 2011， 硕士

【摘要】 乙烯-醋酸乙烯酯共聚物(EVA)是近年来发展较快的塑料产品之一,它具有良好的柔韧性、耐冲击性、耐环境应力,与填料、阻燃剂等有较好的混容性。但EVA比较易燃,同时产生带有毒性气体的黑烟,限制了其在家电、建筑、建材、电缆绝缘等方面的应用,因此EVA的阻燃性越来越引起人们的关注与重视。氢氧化镁可以说是当前公认具有填充、阻燃和抑烟三重功能的化学助剂,相比于其他阻燃剂,其在高分子材料应用中不仅能达到优良的阻燃效果,且有很好的抑烟效果,而且无毒、无腐蚀和低价等优点。它能与多种成分复配,而且具有抗酸性,能中和燃烧过程中产生的酸性和腐蚀性气体,是一种环境友好的绿色阻燃剂.但由于氢氧化镁阻燃剂相对于基物EVA添加量大,阻燃效率低,对其机械性能影响大,对其改性的研究仍是重中之重。本文在现有文献报道的基础上,分别用复配技术、偶联剂接枝技术及插层技术对氢氧化镁进行改性,添加了两种相容剂,它们分别是EVA-D4085和马来酸酐接枝EVA,研究了制备工艺和改性对EVA阻燃性能、力学性能、热力学性能、吸潮性能的影响。本文对氢氧化镁阻燃EVA研究较为具体,先以不同比例纯氢氧化镁(没经任何处理)与EVA密炼混合,研究表明,该阻燃复合体系垂直燃烧要达到V-0级,阻燃剂添加量需达到65%以上,此时的断裂伸长率仅在11.32%。加入10%相容剂马来酸酐接枝EVA时,断裂伸长率有所提高,可达31.5％;不同比例经硅烷偶联剂处理后的氢氧化镁,在与EVA密炼混合,研究表明,阻燃复合体系的断裂伸长率稍微有所改善；改性硼酸锌与改性氢氧化镁协同阻燃EVA,研究表明,当改性硼酸锌质量比为10%时,其协同改性氢氧化镁阻燃EVA的力学性能、阻燃性能、耐热性能都有所提高。本文还将偶联剂KH-550锚固在氢氧化镁上,然后再将异氰尿酸三缩水甘油酯(TGIC)接枝于其上,制备了异氰尿酸三缩水甘油酯(TGIC)接枝的氢氧化镁阻燃剂,研究了异氰尿酸三缩水甘油酯(TGIC)接枝的氢氧化镁的制备工艺,添加了不同比例的相容剂,并考察了接枝对EVA的阻燃性能、力学性能、热力学性能的影响。结果显示：异氰尿酸三缩水甘油酯(TGIC)接枝的氢氧化镁均能够较好的分散于EVA中,可以提高材料的垂直燃烧性能,在阻燃剂添加量为60%时,接枝氢氧化镁阻燃的EVA均能从未处理的V-1提升到V-0。力学性能大大的提高。根据氢氧化镁本身的特殊层状结构,本文还使用了硼酸-氧化锌改性技术,采用不同物质量比的硼酸与氧化锌反应,用激光粒度分析仪及高扫描显微镜(SEM)表征改性氢氧化镁的表面性质,制备了一种硼酸-氧化锌改性的氢氧化镁阻燃剂,研究了硼酸-氧化锌改性氢氧化镁阻燃剂的制备工艺,并考察了改性后对EVA的阻燃性能、力学性能、热力学性能的影响。结果显示：在阻燃剂添加量为63%时,硼酸-氧化锌改性的氢氧化镁阻燃剂阻燃的EVA能达到V-0级别,相容剂添加后,力学性能等均较好。更多还原

【Abstract】 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.更多还原