CN103642119A - 微硅粉增强乙烯-醋酸乙烯共聚物材料及其制备方法 - Google Patents

微硅粉增强乙烯-醋酸乙烯共聚物材料及其制备方法 Download PDF

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CN103642119A
CN103642119A CN201310719080.1A CN201310719080A CN103642119A CN 103642119 A CN103642119 A CN 103642119A CN 201310719080 A CN201310719080 A CN 201310719080A CN 103642119 A CN103642119 A CN 103642119A
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silica fume
ethylene
vinyl acetate
acetate copolymer
eva
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石文建
杨再祥
吴毅
雷勇
魏喜苹
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GUIZHOU LANTU NEW MATERIALS CO Ltd
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Abstract

本发明公开了一种微硅粉增强乙烯-醋酸乙烯共聚物材料及其制备方法,按重量份数计算,包括40~95份乙烯-醋酸乙烯共聚物、1~50份微硅粉、0.1~5份表面改性剂以及0.1~0.5份抗氧化剂。本发明将微硅粉进行表面改性后,再乙烯-醋酸乙烯共聚物混合,并在混合过程中加入抗氧化剂,在设定好挤出机螺杆的转速及挤出温度下进行熔融挤出造粒,以获得性能优异的微硅粉改性乙烯-醋酸乙烯共聚物母粒。本发明能有效解决乙烯-醋酸乙烯共聚物拉伸强度等缺点,降低乙烯-醋酸乙烯共聚物材料原料成本,改善了乙烯-醋酸乙烯共聚物材料的抗蠕变性能和耐热性能,微硅粉改性乙烯-醋酸乙烯共聚物复合材料综合性能优良,可进行连续生产。

Description

微硅粉增强乙烯-醋酸乙烯共聚物材料及其制备方法
技术领域
本发明涉及高分子科学领域,尤其是一种微硅粉增强乙烯-醋酸乙烯共聚物材料及其制备方法。
背景技术
EVA称为乙烯醋酸乙烯共聚物,EVA树脂的性能主要取决于分子链上醋酸乙烯的含量。一般醋酸乙烯(VA)含量在5%~40%。与聚乙烯相比,EVA由于在分子链中引入了醋酸乙烯单体,从而降低了高结晶度,提高了柔韧性、抗冲击性、填料相溶性和热密封性能,EVA树脂具有良好的柔软性和橡胶的弹性,在较低的温度下仍具有较好的可挠性,其化学稳定性良好,抗老化和耐臭氧强度好,无毒性,EVA树脂与填料的掺混性和成型加工性能较好。EVA被广泛用于发泡鞋料、功能性棚膜、包装膜、热熔胶、电线电缆及玩具等领域。纯EVA在加工使用中,由于价格高而限制了其应用领域。 
微硅粉又称硅灰或凝聚硅灰,外观为灰色或灰白色粉末。其平均粒径在0.1~0.3um,比表面积较大。其细度和比表面积约为水泥的80~100倍,粉煤灰的50~70倍。微硅粉是冶炼硅铁和工业硅(金属硅)的副产物,矿热电炉内产生出大量挥发性很强的SiO2和Si气体,气体排放后与空气迅速氧化冷凝沉淀而生成的。它是大工业冶炼中,整个过程需要用除尘环保设备进行回收,因为质量比较轻,还需要用加密设备进行加密。微硅粉在形成过程中受表面张力的作用,形成了非结晶相无定形圆球状颗粒,表面较为光滑,有些则是多个圆球颗粒粘在一起的团聚体,微小的球状体可以起到润滑的作用。
中国专利公开号CN103232718A,于2013年8月7日公开了“微硅粉/SBS复合改性沥青及其制备方法”。该专利是采用微硅粉填充到沥青中,得到复合改性的沥青,提高沥青基材的粘合性、耐热性和抗老化性,可节约沥青的使用量,降低生产成本。
中国专利公开号CN102775913A,于2012年11月14日公开了“ 一种利用工业废料微硅粉制作的涂料及其制备方法”。该发明涉及一种利用工业废料微硅粉制作的涂料及其制备方法,该发明充分利用工业废料微硅粉,使其变废为宝,减轻环境压力;且因原料廉价,涂料具有较好的成本优势,同时具有结构致密、填隙良好、附着牢固、色泽雅致的优点。
可见,现有技术主要是将微硅粉作为填料添加到沥青或涂料中,并未涉及到作为增强乙烯-醋酸乙烯共聚物材料内。
发明内容
本发明的目的是:提供一种微硅粉增强乙烯-醋酸乙烯共聚物材料及其制备方法,它不仅能降低生产成本,还改善了乙烯-醋酸乙烯共聚物材料的抗蠕变性能和耐热性能,以克服现有技术的不足。
本发明是这样实现的:微硅粉增强乙烯-醋酸乙烯共聚物材料,按重量份数计算,包括40~95份乙烯-醋酸乙烯共聚物、1~50份微硅粉、0.1~5份表面改性剂以及0.1~0.5份抗氧化剂。
所述的表面改性剂为硅烷偶联剂、钛酸酯偶联剂或硬脂酸中的一种或几种的任意组合。
还包括0.1~5份抗老化剂,抗老化剂为纳米二氧化钛。
微硅粉增强乙烯-醋酸乙烯共聚物材料的制备方法,按上述重量份数取各组分,将微硅粉与表面改性剂进行混合,混合温度为50℃,混合2h后,获得改性的微硅粉;将改性的微硅在温度为100℃的条件下真空干燥6h,获得干燥的改性微硅粉;将干燥的改性微硅粉与乙烯-醋酸乙烯共聚物及抗氧化剂充分混合均匀后,加入挤出机熔融挤出造粒并干燥后,获得微硅粉改性乙烯-醋酸乙烯共聚物母粒。
挤出机螺杆的转速为200rpm及挤出温度分别为一区150℃、二区160℃、三区170℃、四区180℃、五区180℃、机头170℃。
将干燥的改性微硅粉与乙烯-醋酸乙烯共聚物及抗氧化剂进行混合时,同时还加入0.1~5份抗老化剂。
由于采用了上述的技术方案,本发明将微硅粉进行表面改性后,再乙烯-醋酸乙烯共聚物混合,并在混合过程中加入抗氧化剂,在设定好挤出机螺杆的转速及挤出温度下进行熔融挤出造粒,以获得性能优异的微硅粉改性乙烯-醋酸乙烯共聚物母粒。加工过程中,通过控制微硅粉、改性剂、抗氧化剂的添加量,以及混合挤出时的温度及螺杆转速来有效控制改性乙烯-醋酸乙烯共聚物的力学性能,通过改性微硅粉添加到乙烯-醋酸乙烯共聚物材料中,能有效提高乙烯-醋酸乙烯共聚物拉伸强度和抗冲击性能。本发明生产方法简单,制备出的微硅粉改性乙烯-醋酸乙烯共聚物复合材料强度和韧性得到了大幅提高,通过填充微硅粉,降低了生产成本,改善了乙烯-醋酸乙烯共聚物材料的抗蠕变性能和耐热性能,微硅粉改性乙烯-醋酸乙烯共聚物复合材料综合性能优良,可进行连续生产。采用微硅粉作为一种填料添加到乙烯-醋酸乙烯共聚物材料中,可以减轻工业废物微硅粉对环境的压力,能达到变废为宝的目的。本发明可广泛的应用于建材、家电、建筑及土工材料等领域,综合性能较好,具有一定的市场竞争力。
具体实施方式
本发明的实施例1:微硅粉增强乙烯-醋酸乙烯共聚物材料,按重量份数计算,包括70份乙烯-醋酸乙烯共聚物、25份微硅粉、1.25份表面改性剂、0.25份抗氧化剂以及3.5份抗老化剂;表面改性剂为钛酸酯偶联剂;抗氧化剂为对苯二酚,抗老化剂为纳米二氧化钛。
微硅粉增强乙烯-醋酸乙烯共聚物材料的制备方法,按上述重量份数取各组分,将微硅粉与表面改性剂进行混合,混合温度为50℃,混合2h后,获得改性的微硅粉;将改性的微硅在温度为100℃的条件下真空干燥6h,获得干燥的改性微硅粉;将干燥的改性微硅粉与乙烯-醋酸乙烯共聚物及抗氧化剂充分混合均匀后,加入挤出机熔融挤出造粒并干燥后,获得微硅粉改性乙烯-醋酸乙烯共聚物母粒;挤出机螺杆的转速为200rpm及挤出温度分别为一区150℃、二区160℃、三区170℃、四区180℃、五区180℃、机头170℃。
将干燥的改性微硅粉与乙烯-醋酸乙烯共聚物及抗氧化剂进行混合时,同时还加入3.5份抗老化剂。
实验结果表明:纯乙烯-醋酸乙烯共聚物拉伸强度为3.5MPa,断裂伸长率为400%,加入25份微硅粉后复合材料拉伸强度增加60.2%,断裂伸长率下降25.6%。
本发明的实施例2:微硅粉增强乙烯-醋酸乙烯共聚物材料,按重量份数计算,包括80份乙烯-醋酸乙烯共聚物、15份微硅粉、0.5份表面改性剂、0.5份抗氧化剂以及4份抗老化剂;表面改性剂为硅烷偶联剂;抗氧化剂为对苯二胺,抗老化剂为纳米二氧化钛。
制备方法同实施例1。
实验结果表明:纯乙烯-醋酸乙烯共聚物拉伸强度为3.5MPa,断裂伸长率为400%,加入15份微硅粉后复合材料拉伸强度增加53.8%,断裂伸长率下降32.4%。
本发明的实施例3:微硅粉增强乙烯-醋酸乙烯共聚物材料,按重量份数计算,包括95份乙烯-醋酸乙烯共聚物、1份微硅粉、0.1份表面改性剂、0.5份抗氧化剂以及3.4份抗老化剂;表面改性剂为硬脂酸;抗氧化剂为对苯二酚,抗老化剂为纳米二氧化钛。
制备方法同实施例1。
实验结果表明:纯乙烯-醋酸乙烯共聚物拉伸强度为3.5MPa,断裂伸长率为400%,加入1份微硅粉后复合材料拉伸强度增加9.87%,断裂伸长率下降12.3%。
本发明的实施例4:微硅粉增强乙烯-醋酸乙烯共聚物材料,按重量份数计算,包括90份乙烯-醋酸乙烯共聚物、5份微硅粉、1.5份表面改性剂、0.5份抗氧化剂以及3份抗老化剂;表面改性剂为等量的硅烷偶联剂、钛酸酯偶联剂或硬脂酸组成;抗氧化剂为对苯二胺,抗老化剂为纳米二氧化钛。
制备方法同实施例1。
实验结果表明:纯乙烯-醋酸乙烯共聚物拉伸强度为3.5MPa,断裂伸长率为400%,加入1份微硅粉后复合材料拉伸强度增加23.6%,断裂伸长率下降31.4%。

Claims (7)

1.一种微硅粉增强乙烯-醋酸乙烯共聚物材料,其特征在于:按重量份数计算,包括40~95份乙烯-醋酸乙烯共聚物、1~50份微硅粉、0.1~5份表面改性剂以及0.1~0.5份抗氧化剂。
2.根据权利要求1所述的微硅粉增强乙烯-醋酸乙烯共聚物材料,其特征在于:所述的表面改性剂为硅烷偶联剂、钛酸酯偶联剂或硬脂酸中的一种或几种的任意组合。
3.根据权利要求1所述的微硅粉增强乙烯-醋酸乙烯共聚物材料,其特征在于:所述的看氧化剂为对苯二酚或对苯二胺。
4.根据权利要求1所述的微硅粉增强乙烯-醋酸乙烯共聚物材料,其特征在于:还包括0.1~5份抗老化剂,抗老化剂为纳米二氧化钛。
5.一种如权利要求1所述的微硅粉增强乙烯-醋酸乙烯共聚物材料的制备方法,其特征在于:按上述重量份数取各组分,将微硅粉与表面改性剂进行混合,混合温度为50℃,混合2h后,获得改性的微硅粉;将改性的微硅在温度为100℃的条件下真空干燥6h,获得干燥的改性微硅粉;将干燥的改性微硅粉与乙烯-醋酸乙烯共聚物及抗氧化剂充分混合均匀后,加入挤出机熔融挤出造粒并干燥后,获得微硅粉改性乙烯-醋酸乙烯共聚物母粒。
6.根据权利要求5所述的微硅粉增强乙烯-醋酸乙烯共聚物材料的制备方法,其特征在于:挤出机螺杆的转速为200rpm及挤出温度分别为一区150℃、二区160℃、三区170℃、四区180℃、五区180℃、机头170℃。
7.根据权利要求5所述的微硅粉增强乙烯-醋酸乙烯共聚物材料的制备方法,其特征在于:将干燥的改性微硅粉与乙烯-醋酸乙烯共聚物及抗氧化剂进行混合时,同时还加入0.1~5份抗老化剂。
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