CN112063056A - 一种良外观玻纤增强聚丙烯复合材料及其制备方法 - Google Patents
一种良外观玻纤增强聚丙烯复合材料及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种良外观玻纤增强聚丙烯复合材料,其原料按重量份包括:三元共聚聚丙烯50~90份,玻璃纤维10~40份,相容剂2~8份,过氧化物0.01~0.1份,偶联剂0.5~2份,其他助剂0.2~2份。本发明还公开了上述良外观玻纤增强聚丙烯复合材料的制备方法。本发明选用低结晶度的三元共聚聚丙烯作为树脂基体,并利用过氧化物在树脂螺杆剪切过程中降解聚丙烯分子链并改变分子链的规整度,从而在提高树脂流动性的同时并扰乱聚丙烯基体的结晶;同时在偶联剂作用下,改善聚丙烯树脂与玻纤之间的相容性,提高分散相和连续相的均匀性,改善玻纤外露现象,形成低浮纤良外观的玻纤增强聚丙烯复合材料。
Description
技术领域
本发明涉及高分子材料技术领域,尤其涉及一种良外观玻纤增强聚丙烯复合材料及其制备方法。
背景技术
聚丙烯PP材料因其密度小、成本低、综合性能优异、易加工成型等诸多优势,当前被广泛应用于家电、汽车等领域。但纯的聚丙烯因其强度、尺寸稳定性等缺陷限制了其应用领域,因而通常利用矿粉、纤维等进行填充改性,以达到增强改性的目的;玻璃纤维填充改性是当前最常用的增强改性方式,但由于玻璃纤维为非极性材料,与聚丙烯的相容性较差,尽管纤维表面进行了改性处理,但在制品表面依然形成严重浮纤,限制了其应用。
目前关于低浮纤的改善方案主要还是采用物理共混的方法,通过改善玻纤与聚丙烯的相容性;中国专利201310703432.4,公开了一种利用弹性体扰乱聚丙烯的结晶作用,从而得到抗冲击强度高的低浮纤玻纤增强材料,但是由于引入了弹性体,材料的刚度模量等性能会有所衰减;中国专利201110321904.0也公开了利用复合纤维、接枝聚丙烯等制备得优良外观的玻纤增强复合材料,但是这是通过处理玻纤以及加相容剂来改善玻纤与聚丙烯的相容性,缺点是玻纤含量不能过多,否则造成制件外观较差。
发明内容
基于背景技术存在的技术问题,本发明提出了一种良外观玻纤增强聚丙烯复合材料及其制备方法,本发明在确保玻纤增强聚丙烯材料高机械强度的前提下,选用低结晶度的三元共聚聚丙烯作为树脂基体,并利用过氧化物在树脂螺杆剪切过程中降解聚丙烯分子链并改变分子链的规整度,从而在提高树脂流动性的同时并扰乱聚丙烯基体的结晶;同时在偶联剂作用下,改善聚丙烯树脂与玻纤之间的相容性,提高分散相和连续相的均匀性,改善玻纤外露现象,形成低浮纤良外观的玻纤增强聚丙烯复合材料。
本发明提出的一种良外观玻纤增强聚丙烯复合材料,其原料按重量份包括:三元共聚聚丙烯50~90份,玻璃纤维10~40份,相容剂2~8份,过氧化物0.01~0.1份,偶联剂0.5~2份,其他助剂0.2~2份。
优选地,三元共聚聚丙烯的溶体流动速率为5~60g/10min。
优选地,玻璃纤维为无碱玻璃纤维,单根玻璃纤维的直径为10~20μm。
优选地,相容剂为PP-g-MAH、POE-g-MAH中的至少一种。
上述PP-g-MAH是指马来酸酐接枝聚丙烯、POE-g-MAH是指马来酸酐接枝乙烯丁烯共聚物。
优选地,过氧化物为过氧化二已丙苯(简称DCP)、过氧化二叔丁基(简称DTBP)、过氧化苯甲酸叔丁酯(简称TPB)中的一种。
优选地,偶联剂为硅烷偶联剂、钛酸酯偶联剂、铝酸酯偶联剂、磷酸酯偶联剂中的一种。
优选地,其他助剂包含抗氧剂、润滑剂、耐UV剂、颜料。
本发明还提出了上述良外观玻纤增强聚丙烯复合材料的制备方法,包括如下步骤:将除玻璃纤维以外的其他原料共混,然后从主喂料口加入挤出机中,从侧喂料口加入玻璃纤维,经熔融,挤出,造粒,冷却,烘干得良外观玻纤增强复合材料。
优选地,挤出机为双螺杆挤出机,螺杆转速为300~500r/min,从二区到十区温度分别为:190℃、200℃、210℃、220℃、220℃、220℃、220℃、220℃、210℃、200℃。
有益效果:
(1)本发明在确保玻纤增强聚丙烯材料高机械强度的前提下,选用低结晶度的三元共聚聚丙烯作为树脂基体,替代常规使用的二元共聚聚丙烯或均聚聚丙烯,三元共聚聚丙烯具有更低的结晶度,在与玻璃纤维复合成型过程中可以更好的包覆玻璃纤维;
(2)本发明通过在熔融挤出过程中添加过氧化物与偶联剂,一方面过氧化物在树脂螺杆剪切过程中降解聚丙烯分子链并改变分子链的规整度,从而在提高树脂流动性的同时并扰乱聚丙烯基体的结晶速率及结晶度,有利于在成型过程中加大玻璃纤维分散性和减小取向性,获得较低的制品表面粗糙度;同时在偶联剂作用下,改善聚丙烯树脂与玻璃纤维之间的相容性,通过改进玻纤和树脂之间的界面相容性,提高分散相和连续相的均匀性,增加界面粘接强度,减少玻璃纤维与树脂的分离,改善玻璃纤维外露现象,形成低浮纤良外观的玻纤增强聚丙烯复合材料。
具体实施方式
下面,通过具体实施例对本发明的技术方案进行详细说明。
在以下实施例和对比例中,所述三元共聚聚丙烯牌号为C5908,厂家为燕山石化,抗氧剂、润滑剂、颜料、耐候剂均为常规市售材料。
实施例1~3和对比例1~2的重量份配方如表1所示。
表1
上述实施例1~6和对比例1~2的制备方法相同,均为:
将除玻璃纤维以外的其他原料一起置于高混机中混合5min,然后从主喂料口加入双螺杆挤出机中,从侧喂料口加入玻璃纤维,经熔融,挤出,造粒,冷却,烘干得良外观玻纤增强复合材料,其中,螺杆转速为400r/min,从二区到十区温度分别为:190℃、200℃、210℃、220℃、220℃、220℃、220℃、220℃、210℃、200℃。
取实施例1~6和对比例1~2中制得的玻纤增强聚丙烯复合材料进行力学性能测试及外观评估,结果见表2。
表2测试结果
备注:浮纤等级的检测方法为:取玻纤增强聚丙烯复合材料用抛光模具制成样板,利用二次原相仪对表面进行观察,取特定区域2mm*2mm范围样板表面出现的玻纤根数分为5个等级,等级越低表示表面外观越好,反之越差;其中,1级表示玻纤数量在30根以下,2级表示玻纤数量在30~60根之间,3级表示玻纤数量在60~100根之间,4级表示玻纤数量在100~200根之间,5级表示玻纤数量在200根以上。
由上表可以看出:利用三元共聚聚丙烯为树脂基体,并在过氧化物与偶联剂的协同作用下,所制备的玻纤增强聚丙烯材料,相对于传统的玻纤增强聚丙烯材料,玻纤外漏现象明显得到改善,不仅具备了优异的低浮纤外观效果,而且保持了良好的机械性能。
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。
Claims (9)
1.一种良外观玻纤增强聚丙烯复合材料,其特征在于,其原料按重量份包括:三元共聚聚丙烯50~90份,玻璃纤维10~40份,相容剂2~8份,过氧化物0.01~0.1份,偶联剂0.5~2份,其他助剂0.2~2份。
2.根据权利要求1所述良外观玻纤增强聚丙烯复合材料,其特征在于,三元共聚聚丙烯的溶体流动速率为5~60g/10min。
3.根据权利要求1或2所述良外观玻纤增强聚丙烯复合材料,其特征在于,玻璃纤维为无碱玻璃纤维,单根玻璃纤维的直径为10~20μm。
4.根据权利要求1-3任一项所述良外观玻纤增强聚丙烯复合材料,其特征在于,相容剂为PP-g-MAH、POE-g-MAH中的至少一种。
5.根据权利要求1-4任一项所述良外观玻纤增强聚丙烯复合材料,其特征在于,过氧化物为过氧化二已丙苯、过氧化二叔丁基、过氧化苯甲酸叔丁酯中的一种。
6.根据权利要求1-5任一项所述良外观玻纤增强聚丙烯复合材料,其特征在于,偶联剂为硅烷偶联剂、钛酸酯偶联剂、铝酸酯偶联剂、磷酸酯偶联剂中的一种。
7.根据权利要求1-6任一项所述良外观玻纤增强聚丙烯复合材料,其特征在于,其他助剂包含抗氧剂、润滑剂、耐UV剂、颜料。
8.一种如权利要求1-7任一项所述良外观玻纤增强聚丙烯复合材料的制备方法,其特征在于,包括如下步骤:将除玻璃纤维以外的其他原料共混,然后从主喂料口加入挤出机中,从侧喂料口加入玻璃纤维,经熔融,挤出,造粒,冷却,烘干得良外观玻纤增强复合材料。
9.根据权利要求8所述良外观玻纤增强聚丙烯复合材料的制备方法,其特征在于,挤出机为双螺杆挤出机,螺杆转速为300~500r/min,从二区到十区温度分别为:190℃、200℃、210℃、220℃、220℃、220℃、220℃、220℃、210℃、200℃。
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CN112778738A (zh) * | 2021-01-06 | 2021-05-11 | 广州辰东新材料有限公司 | 一种高强度低模温低浮纤聚碳酸酯复合材料及其制备方法 |
CN112778738B (zh) * | 2021-01-06 | 2022-06-03 | 广州辰东新材料有限公司 | 一种高强度低模温低浮纤聚碳酸酯复合材料及其制备方法 |
CN113603975A (zh) * | 2021-07-28 | 2021-11-05 | 广州市聚赛龙工程塑料股份有限公司 | 一种聚丙烯复合材料及其制备方法与应用 |
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