CN111748149A - 一种低气味长玻纤增强微发泡聚丙烯复合材料及其制备方法 - Google Patents
一种低气味长玻纤增强微发泡聚丙烯复合材料及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种低气味长玻纤增强微发泡聚丙烯复合材料,包括下述重量份的原料:高玻纤含量长玻纤增强聚丙烯材料30~50份、聚丙烯50~70份、发泡母粒1~3份、除味母粒1~5份;其中高玻纤含量长玻纤增强聚丙烯材料包括下述重量份的原料:聚丙烯30~65份、连续玻璃纤维30~60份、相容剂2~8份、助剂0.5~2份。本发明还公开了低气味长玻纤增强微发泡聚丙烯复合材料的制备方法,将原料混合均匀后,在二次开模条件下进行微发泡注塑成型即得。本发明的微发泡聚丙烯复合材料泡孔均匀、细小,具备良好的机械性能,且具备良好的气味性,满足当前轻量化仪表板本体、中控骨架、门板嵌件等汽车内饰材料的设计要求。
Description
技术领域
本发明涉及高分子材料技术领域,尤其涉及一种低气味长玻纤增强微发泡聚丙烯复合材料及其制备方法。
背景技术
近些年,随着人们环保意识的逐渐增强,对汽车的轻量化设计要求越来越高,在保证汽车的强度和安全性能的前提下,尽可能地降低汽车的整体质量,从而提高汽车的动力性,减少燃料消耗,降低排气污染。长玻纤增强聚烯烃材料因其优异的力学性能,刚性、抗冲击强度、以及尺寸稳定性。并可以做出复杂的汽车模块制品,目前在汽车的前端模块、脚踏板、天窗骨架、仪表板骨架、中控骨架、门板嵌件、后尾门等部件均逐步替代金属合金材料推广应用。
为了在现有材料应用的基础上进一步进行轻量化设计,微发泡技术是当前重点选择的一个方向,目前常规的微发泡材料应用是将已经完全改性之后的聚丙烯树脂,通过与发泡剂均匀混合后注塑成型。这种常规方式的缺陷在于,聚丙烯树脂均完全经过挤出螺杆成型,一方面树脂熔体强度遭到一定程度的破坏,不利于形成均匀致密的泡孔;另一方面,聚丙烯树脂均完全经过螺杆剪切,聚丙烯材料会发生缓慢降解,产生甲醛、乙醛以及其他酮、苯类低分子物质,不利于符合当前汽车内饰低散发的要求。通常材料在挤出改性过程中为了达到低散发要求,除了在挤出过程加强真空,也会在配方体系中添加一定量的除味剂,但除味剂在后续注塑成型过程中已基本失效,对终端产品的气味改善效果不明显。
发明内容
基于背景技术存在的技术问题,本发明提出了一种低气味长玻纤增强微发泡聚丙烯复合材料,包括下述重量份的原料:高玻纤含量长玻纤增强聚丙烯材料30~50份、聚丙烯50~70份、发泡母粒1~3份、除味母粒1~5份;
所述高玻纤含量长玻纤增强聚丙烯材料包括下述重量份的原料:聚丙烯30~65份、连续玻璃纤维30~60份、相容剂2~8份、助剂0.5~2份;所述高玻纤含量长玻纤增强聚丙烯材料为经LFT浸渍工艺制备得到。
优选地,所述连续玻璃纤维的单丝直径为12~18um。
优选地,所述相容剂为PP接枝马来酸酐或者POE接枝马来酸酐。
优选地,所述助剂包括抗氧剂、润滑剂、耐UV剂和颜料。
优选地,所述发泡母粒为以POE为载体,以碳酸氢钠为发泡剂制得的母粒。
优选地,所述除味母粒为以PE为载体的水母粒,含水率在30%以上。
优选地,所述聚丙烯的熔体流动速率为30~90g/10min,按大众PV3900气味标准气味等级不高于3.5级。
一种所述的低气味长玻纤增强微发泡聚丙烯复合材料的制备方法,包括下述步骤:按重量称取原料,将高玻纤含量长玻纤增强聚丙烯材料、聚丙烯、发泡母粒、除味母粒混合均匀后,在二次开模条件下进行微发泡注塑成型,即得。
优选地,所述注塑成型的温度为190~230℃。
本发明的有益效果如下:
(1)本发明利用高玻纤含量的长玻纤增强聚丙烯与聚丙烯进行对掺的方式达到最终材料所需要的玻纤含量,这样可避免一部分聚丙烯原料一次过螺杆的剪切过程,不仅可以降低气味的产生,而且可以避免聚丙烯树脂熔体强度降低,较高的熔体强度更有利于化学发泡过程,形成致密、均匀的泡孔结构;
(2)与传统在挤出改性过程添加除味母粒相比,本发明在注塑成型过程中添加除味母粒,可有效去除在注塑成型过程中所产生的小分子物质,从而进一步降低终端产品气味;
由此,本发明通过在高玻纤含量的长玻纤增强聚丙烯材料中,添加低散发的聚丙烯原料、除味母粒以及发泡剂等混合均匀后进行注塑成型,一方面,部分聚丙烯原料前期未经过挤出机螺杆剪切过程,能够保留较好的气味状态以及熔体强度;另一方面除味母粒可直接在注塑成型过程中发挥作用,使得最终产品制件达到较好的气味状态,使得到的微发泡聚丙烯复合材料不仅泡孔均匀、细小,具备良好的机械性能,而且具备良好的气味性,能够满足当前轻量化仪表板本体、中控骨架、门板嵌件等汽车内饰材料的设计要求。
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。
下述实施例和对比例中,所采用的原料如下:
聚丙烯,牌号为M60RHC,厂家镇海炼化;
玻璃纤维,牌号为SE4849,厂家欧文斯科宁;
PP接枝马来酸酐,牌号为CA100,厂家为阿科玛;
POE接枝马来酸酐,牌号为N-048,厂家为宁波能之光;
除味母粒,牌号为BYK-P 4200,厂家为德国毕克;
发泡母粒,牌号为EE25C,厂家为永和精细化工;
其他材料均为市售普通材料或为自制材料。
实施例1
制备低气味长玻纤增强微发泡聚丙烯复合材料:按重量计,称取高玻纤含量长玻纤增强聚丙烯材料50份、聚丙烯50份、发泡母粒1份、除味母粒5份,混合均匀后,在二次开模条件下进行微发泡注塑成型,注塑成型的温度为190~230℃,即得;
其中,高玻纤含量长玻纤增强聚丙烯材料包括下述重量份的原料:聚丙烯65份、连续玻璃纤维30份、PP接枝马来酸酐2份、助剂2份,经LFT浸渍工艺制得高玻纤含量长玻纤增强聚丙烯材料。
实施例2
制备低气味长玻纤增强微发泡聚丙烯复合材料:按重量计,称取高玻纤含量长玻纤增强聚丙烯材料45份、聚丙烯55份、发泡母粒2份、除味母粒3份,混合均匀后,在二次开模条件下进行微发泡注塑成型,注塑成型的温度为190~230℃,即得;
其中,高玻纤含量长玻纤增强聚丙烯材料包括下述重量份的原料:聚丙烯55份、连续玻璃纤维40份、PP接枝马来酸酐4份、助剂1.5份,经LFT浸渍工艺制得高玻纤含量长玻纤增强聚丙烯材料。
实施例3
制备低气味长玻纤增强微发泡聚丙烯复合材料:按重量计,称取长高玻纤含量长玻纤增强聚丙烯材料40份、聚丙烯60份、发泡母粒2份、除味母粒2份,混合均匀后,在二次开模条件下进行微发泡注塑成型,注塑成型的温度为190~230℃,即得;
其中,高玻纤含量长玻纤增强聚丙烯材料包括下述重量份的原料:聚丙烯43份、连续玻璃纤维50份、POE接枝马来酸酐6份、助剂1份,经LFT浸渍工艺制得高玻纤含量长玻纤增强聚丙烯材料。
实施例4
制备低气味长玻纤增强微发泡聚丙烯复合材料:按重量计,称取高玻纤含量长玻纤增强聚丙烯材料30份、聚丙烯70份、发泡母粒3份、除味母粒1份,混合均匀后,在二次开模条件下进行微发泡注塑成型,注塑成型的温度为190~230℃,即得;
其中,高玻纤含量长玻纤增强聚丙烯材料包括下述重量份的原料:聚丙烯30份、连续玻璃纤维60份、POE接枝马来酸酐8份、助剂0.5份,经LFT浸渍工艺制得高玻纤含量长玻纤增强聚丙烯材料。
对比例1
按常规工艺制备低气味长玻纤增强微发泡聚丙烯复合材料,具体如下:
制备低气味长玻纤增强微发泡聚丙烯复合材料:按重量计,称取长玻纤增强聚丙烯100份、发泡母粒2份,混合均匀后,在二次开模条件下进行微发泡注塑成型,注塑成型的温度为190~230℃,即得;
其中,长玻纤增强聚丙烯包括下述重量份的原料:聚丙烯76份、连续玻璃纤维20份、PP接枝马来酸酐2.5份、除味母粒2份、助剂1份,经LFT浸渍工艺制得长玻纤增强聚丙烯。
对实施例1-4以及对比例1制得的材料进行测试,结果如表1所示。
表1实施例以及对比例制得的材料测试结果
测试样品 | 实施例1 | 实施例2 | 实施例3 | 实施例4 | 对比例1 |
密度(g/cm<sup>3</sup>) | 0.92 | 0.93 | 0.95 | 0.94 | 0.99 |
泡孔平均尺寸(μm) | 82 | 83 | 81 | 84 | 118 |
气味(PV3900标准) | 4.0 | 4.0 | 4.0 | 4.0 | 5.0 |
从表1中可以看出,通过在高玻纤含量的长玻纤增强聚丙烯材料中,添加聚丙烯、除味母料、发泡母料,经注塑成型二次开模发泡后,可获得泡孔致密的低气味微发泡长玻纤增强聚丙烯复合材料。所得材料的泡孔更小,发泡倍率也明显提高,气味相比常规工艺所制备的材料更佳。
综上所述,本发明所制备的低气味微发泡长玻纤增强聚丙烯复合材料中,利用高玻纤含量的长玻纤增强聚丙烯材料通过添加不含玻纤的聚丙烯稀释得到对应玻纤含量的材料之后,添加除味母粒与发泡剂经注塑成型二次开模发泡工艺,所制备的终端制件产品具有更好的轻量化效果与气味等级。这是由于大部分聚丙烯未经过挤出螺杆剪切过程,从而保留了较高的熔体强度与更好材料气味特性。使得在发泡过程中更易形成致密、均匀的泡孔结构;同时在注塑成型过程中除味母粒的作用下,进一步降低小分子的存在,从而大大改善终端产品的气味等级。最终获得优质的轻量化低气味微发泡长玻纤增强聚丙烯复合材料。
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)
1.一种低气味长玻纤增强微发泡聚丙烯复合材料,其特征在于,包括下述重量份的原料:高玻纤含量长玻纤增强聚丙烯材料30~50份、聚丙烯50~70份、发泡母粒1~3份、除味母粒1~5份;
所述高玻纤含量长玻纤增强聚丙烯材料包括下述重量份的原料:聚丙烯30~65份、连续玻璃纤维30~60份、相容剂2~8份、助剂0.5~2份;所述高玻纤含量长玻纤增强聚丙烯材料为经LFT浸渍工艺制备得到。
2.根据权利要求1所述的低气味长玻纤增强微发泡聚丙烯复合材料,其特征在于,所述连续玻璃纤维的单丝直径为12~18um。
3.根据权利要求1或2所述的低气味长玻纤增强微发泡聚丙烯复合材料,其特征在于,所述相容剂为PP接枝马来酸酐或者POE接枝马来酸酐。
4.根据权利要求1-3任一项所述的低气味长玻纤增强微发泡聚丙烯复合材料,其特征在于,所述助剂包括抗氧剂、润滑剂、耐UV剂和颜料。
5.根据权利要求1-4任一项所述的低气味长玻纤增强微发泡聚丙烯复合材料的制备方法,其特征在于,所述发泡母粒为以POE为载体,以碳酸氢钠为发泡剂制得的母粒。
6.根据权利要求1-5任一项所述的低气味长玻纤增强微发泡聚丙烯复合材料,其特征在于,所述除味母粒为以PE为载体的水母粒,含水率在30%以上。
7.根据权利要求1-6任一项所述的低气味长玻纤增强微发泡聚丙烯复合材料,其特征在于,所述聚丙烯的熔体流动速率为30~90g/10min,按大众PV3900气味标准气味等级不高于3.5级。
8.一种如权利要求1-7任一项所述的低气味长玻纤增强微发泡聚丙烯复合材料的制备方法,其特征在于,包括下述步骤:按重量称取原料,将高玻纤含量长玻纤增强聚丙烯材料、聚丙烯、发泡母粒、除味母粒混合均匀后,在二次开模条件下进行微发泡注塑成型,即得。
9.根据权利要求8所述的低气味长玻纤增强微发泡聚丙烯复合材料的制备方法,其特征在于,所述注塑成型的温度为190~230℃。
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