【作者】 卢克磊；

【导师】 潘炯玺；

【作者基本信息】 青岛科技大学 ， 高分子材料加工工程， 2005， 硕士

【摘要】 氢氧化镁(MH)是用于聚乙烯无卤阻燃最具有发展前途的阻燃剂之一,本文研究了HDPE/MH的阻燃性能和力学性能。结果表明要使HDPE的阻燃性能达到一定要求,至少添加MH的质量份数为60以上,高添加量导致复合材料的力学性能严重劣化。为了使阻燃体系满足实际应用要求: 一是提高阻燃剂的阻燃效率来减少阻燃剂的添加量,从而提高体系的力学性能。首先由实验得到MH和氢氧化铝(ATH)在1:1的添加量时阻燃效率比各自单独使用要高;通过洲与其它无卤阻燃剂(红磷、APP、硼酸锌)的复配实验,表明MH与它们有较好的阻燃协同效应。其次,研究了膨胀型阻燃剂阻燃HDPE,采用膨胀型阻燃剂—聚磷酸铵和季戊四醇(APP/PER)体系对HDPE进行阻燃。通过TGA实验得到APP与PER添加量比例为3:1时阻燃成炭作用最好,添加成炭促进剂1.5phrZ2的阻燃性能最好。 二是通过表面改性剂和增强剂来提高阻燃体系的力学性能。首先用高级脂肪酸或盐类、硅烷偶联剂、钛酸酯类偶联剂对MH的表面改性,结果表明,采用表面改性剂可以大幅度提高HDPE/MH体系的断裂伸长率,同时会导致体系的拉伸强度降低(硅烷类偶联剂基本保持不变)以及阻燃性能下降,采用扫描电子显微镜(SEM)发现改性后的MH能很好的分散到聚乙烯树脂中;其次用羟基硅油对HDPE/MH体系进行改性,结果表明羟基硅油可在一定程度上改善材料的韧性,但同时使材料的拉伸强度和模量大幅下降。另外,羟基硅油不能提高体系的氧指数;再次用有机蒙脱土和绢英粉来增强HDPE/MH阻燃体系,发现不仅力学性能得到提高,阻燃性能也有所提高,复合体系的最大热释放速率明显降低,综合力学性能和阻燃性能考虑,MMT的适宜添加量为6phr。更多还原

【Abstract】 The research on the use of magnesium hydroxide(MH) as a main flame retardant in high density polyethylene (HDPE) was performed. The flame retardant property and mechanical property of HDPE/MH were studied. It has been found that more than 60% by weight of MH is required to obtain an adequate level of flame retardant property of HDPE, and such high loading levels of MH damage the mechanical properties of the filled materials seriously. What I do to make the composites of HDPE/MH used in our lives is:One is to enhance efficiency of flame retardant. Firstly, the study of the great synergistic effect between MH and some other halogen-free flame retardant, such as ATH, zinc borate(ZB), red phosphorous(RP), ammonium polyphosphate (APP)was conducted; secondly, the typical system of intumescent fire retardant-APP-PER (pentaerythritol) was used to hold back the combustion of HDPE. The optimum proportion of APP/PER/ZEO (zeolite), which is 21.4:7.4:1.5, was obtained.Secondly, it is to reinforce mechanical properties of composites by surface modifiers, e.g. stearate acid or stearate salts, silane coupling agents, titanate coupling agents and reinforcing agents e.g. montmorillonite. A great increase of the elongation at break(EB) of the HDPE/MH composites with surface modifiers used was found compared with the composites without the modifiers. On the other hand, the use of stearate series and titanate coupling agents resulted in decreases in the tensile strenth(TS) of the composites. For the composites containing the silane coupling更多还原