CN102120867B - 一种具有高cti的阻燃增强pbt复合材料及其生产工艺 - Google Patents
一种具有高cti的阻燃增强pbt复合材料及其生产工艺 Download PDFInfo
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Abstract
本发明涉及改性工程塑料领域，具体地说是一种具有高CTI的阻燃增强PBT复合材料及其生产工艺，其特征在于成份配比为：PBT(聚对苯二甲酸丁二醇酯，特性粘度：0.83dl/g)：53.5-69.5％，复配增韧剂(聚乙烯∶乙烯/醋酸乙烯共聚酯＝3∶1)：4.3-5.6％，十溴二苯乙烷：7.7-10.8％，三氧化二锑：3.9-5.8％，氟树脂(聚四氟乙烯和聚偏氟乙烯共混物)：0.20-0.80％，无碱玻璃纤维：10-30％。本发明与现有技术相比，可以获得相对漏电痕迹指数CTI250～CTI350，阻燃性达到94UL-V0级(0.8mm，1.6mm)，同时保持了良好的材料力学性能，满足应用在无人看管的白色家电领域的电子元器件的材料要求，并且完全满足薄壁产品(厚度在0.8mm以下)的韧性要求和注塑工艺要求，比目前市面上的材料更加优异，且成本较低，同时拓展了普通溴系阻燃体系的阻燃增强PBT复合材料的应用领域。
Description
[技术领域]
本发明涉及改性工程塑料领域，具体地说是一种具有高CTI的阻燃增强PBT复合材料及其生产工艺。
[背景技术]
目前高相对漏电痕迹指数(CTI)的阻燃增强PBT复合材料一般是通过添加无卤阻燃体系来实现的，但是由于无卤阻燃体系制作的高相对漏电痕迹指数的阻燃增强PBT复合材料成本昂贵，同时相对目前普遍采用的溴系阻燃体系而言，无卤阻燃体系添加量大而导致材料力学性能较差，根本不适合于制作应用在无人看管的白色家电领域的薄壁的电子元器件，很容易引起产品的开裂或脆裂。另外溴系阻燃体系的阻燃增强PBT复合材料由于其力学性能良好而广泛应用在各个行业，但是由于溴系阻燃体系存在游离溴而导致材料的相对漏电痕迹指数偏低，一般在CTI175～CTI225之间。而无人看管的白色家电所采用的电子元器件材料的相对漏电痕迹指数必须要达到或超过CTI250，这就严重制约了普通溴系阻燃体系的阻燃增强PBT复合材料的应用。
[发明内容]
本发明的目的是使阻燃增强PBT复合材料同时拥有良好的力学性能和高CTI。
为了实现上述目的，设计一种具有高CTI的阻燃增强PBT复合材料，由PBT、复合增韧剂、十溴二苯乙烷、三氧化二锑、氟树脂和无碱玻璃纤维组成，其特征在于按照质量百分比配比如下：
PBT 53.5％～69.5％
复合增韧剂 4.3％～5.6％
十溴二苯乙烷 7.7％～10.8％
三氧化二锑 3.9％～5.5％
氟树脂 0.2％～0.8％
无碱玻璃纤维 10％～30％。
所述PBT特性粘度为0.83dl/g。
所述复合增韧剂采用聚乙烯：乙烯/醋酸乙烯共聚酯按3∶1配比混合。
所述氟树脂采用聚四氟乙烯和聚偏氟乙烯混合物。
生产工艺步骤：将PBT在鼓风烘箱中于140℃下烘干4hr后后取出，与复合增韧剂、十溴二苯乙烷、三氧化二锑、氟树脂和无碱玻璃纤维按质量百分比配比混合均匀，然后通过双螺杆挤出机中共混造粒，将得到的复合材料在注塑机中注塑成型。
所述双螺杆挤出机的各段温度依次为：250℃、245℃、240℃、235℃、230℃、225℃、230℃、235℃、240℃、245℃，螺杆转速：300转/分；所述注塑机各段温度依次为：250℃、250℃、250℃、250℃、230℃。
所述阻燃增强PBT复合材料性能如下：拉伸屈服强度在50mm/min条件下为114.6～115.7MPa，断裂伸长率为3.05％～3.60％，拉伸弹性模量为10041～10739MPa，弯曲强度在2mm/min条件下为170.4～173.1MPa，弯曲模量为7797～8219MPa，热变形温度在0.45MPa条件下为223.0℃～223.3℃，热变形温度在1.82MPa条件下为210.5℃～210.9℃，CTI指数为CTI250～CTI350，UL94阻燃性达到94UL-V0级(0.8mm，1.6mm)，IZOD缺口冲击强度在23℃条件下为12.7～13.3KJ/m2，同时完全满足薄壁产品(厚度在0.8mm以下)的韧性要求和注塑工艺要求。
本发明与现有技术相比，在保留溴系阻燃体系的基础上，配方体系中引入了表面特殊处理的氟树脂组分，可以获得相对漏电痕迹指数≥CTI250，最高可以获得CTI350，阻燃性达到94UL-V0级(0.8mm，1.6mm)，同时保持了良好的材料力学性能，满足应用在无人看管的白色家电领域的电子元器件的材料要求，并且完全满足薄壁产品(厚度在0.8mm以下)的韧性要求和注塑工艺要求，比目前市面上的材料更加优异，且成本较低，同时也拓展了普通溴系阻燃体系的阻燃增强PBT复合材料的应用领域。
[附图说明]
图1为本发明的阻燃增强30％PBT复合材料的性能测试数据表；
图2为本发明配方体系中不同含量的氟树脂组分获得的材料CTI值测试数据表。
[具体实施方式]
以下结合附图对本发明创造做进一步详细说明，这种制造技术对本专业的人士来说是清楚的。
本发明创造产品按照质量百分比配比如下：
1、PBT(聚对苯二甲酸丁二醇酯，特性粘度：0.83dl/g)：53.5-69.5％，
2、复配增韧剂(聚乙烯∶乙烯/醋酸乙烯共聚酯＝3∶1)：4.3-5.6％，
3、十溴二苯乙烷：7.7-10.8％，
4、三氧化二锑：3.9-5.8％，
5、氟树脂(聚四氟乙烯和聚偏氟乙烯共混物)：0.20-0.80％
6、无碱玻璃纤维：10-30％；
将PBT在鼓风烘箱中于140℃下烘干4hr，按上述技术配方的组分配方进行混合均匀，然后通过双螺杆挤出机中共混造粒，同时将得到的复合材料在注塑机中注塑成标准样条。其中双螺杆挤出机的各段温度依次为：250℃、245℃、240℃、235℃、230℃、225℃、230℃、235℃、240℃、245℃，螺杆转速：300转/分。注塑成型条件：
注塑机各段温度依次为：250℃、250℃、250℃、250℃、230℃。
其中，原材料采用：
1、PBT：B2550，德国巴斯夫公司
2、聚乙烯PE：1C7A，北京燕山石化公司
3、乙烯/醋酸乙烯共聚酯(EVA)：18-3，北京东方石油化工有限公司有机化工厂
4、十溴二苯乙烷：FM2100，美国大湖公司
5、三氧化二锑：云南木利锑业有限公司
6、无碱玻璃纤维：T635C，泰山玻纤集团
7、氟树脂(聚四氟乙烯和聚偏氟乙烯共混物)：HEROL UB C，德国巴斯夫公司
设备与仪器采用：
1、
同向双螺杆挤出机：SHJ-65B，南京广达化工设备有限公司
2、熔体流动速率仪：XNR-400，承德金建检测仪器有限公司
3、漏电起痕试验仪：LDQ-2，上海埃微电子科技有限公司
4、水平垂直燃烧试验仪：HVL-75，上海埃微电子科技有限公司
5、灼热丝试验仪：ZRF-JT，上海竞田电子科技有限公司
6、塑料摆锤冲击试验机：ZGC7501-2，美特斯工业***(中国)有限公司
7、电子万能试验机：CMT6104，美特斯工业***(中国)有限公司
8、热变形维卡软化点试验机：ZWK1302-1，美特斯工业***(中国)有限公司
9、注塑机：PT80，宁波力劲有限公司
Claims (5)
1.一种具有高CTI的阻燃增强PBT复合材料，由PBT、复合增韧剂、十溴二苯乙烷、三氧化二锑、氟树脂和无碱玻璃纤维组成，其特征在于所述的复合增韧剂采用聚乙烯：乙烯/醋酸乙烯共聚酯按3:1配比混合，所述氟树脂采用聚四氟乙烯和聚偏氟乙烯混合物，按照质量百分比配比如下：
2.如权利要求1所述的一种具有高CTI的阻燃增强PBT复合材料，其特征在于所述PBT特性粘度为0.83dl/g。
3.如权利要求1所述的一种具有高CTI的阻燃增强PBT复合材料，其特征在于所述阻燃增强PBT复合材料的性能如下：拉伸屈服强度在50mm/min条件下为114.6~115.7MPa，断裂伸长率为3.05%~3.60%，拉伸弹性模量为10041~10739MPa，弯曲强度在2mm/min条件下为170.4～173.1MPa，弯曲模量为7797~8219MPa，热变形温度在0.45MPa条件下为223.0℃~223.3℃，热变形温度在1.82MPa条件下为210.5℃~210.9℃，CTI指数为CTI250~CTI350，在厚度0.8mm和1.6mm的阻燃性达到UL94的V0级，IZOD缺口冲击强度在23℃条件下为12.7~13.3KJ/m2。
4.一种制备如权利要求1所述具有高CTI的阻燃增强PBT复合材料的生产工艺，其特征在于将PBT在鼓风烘箱中于140℃下烘干4hr后取出，与复合增韧剂、十溴二苯乙烷、三氧化二锑、氟树脂和无碱玻璃纤维按质量百分比配比混合均匀，然后通过双螺杆挤出机中共混造粒，将得到的复合材料在注塑机中注塑成型。
5.如权利要求4所述的一种制备具有高CTI的阻燃增强PBT复合材料的生产工艺，其特征在于所述双螺杆挤出机的各段温度依次为：250℃、245℃、240℃、235℃、230℃、225℃、230℃、235℃、240℃、245℃，螺杆转速：300转/分；所述注塑机各段温度依次为：250℃、250℃、250℃、250℃、230℃。
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