CN104072982A - 一种耐高温尼龙及其制备方法 - Google Patents
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Abstract
本发明提供一种耐高温尼龙及其制备方法,其中,耐高温尼龙,按重量份计,包括:硅灰石60~80份、滑石粉0~25份、云母粉0~20、偶联剂0.5~4份、聚乙烯蜡1~4份和聚酰胺20~40份;具体的制备方法为:1、将硅灰石、滑石粉和云母粉按比例进行混合,混合后进行干燥得混合无机粉体;将上述无机粉体加热至80~120℃后,加入偶联剂进行混合,再放入高速搅拌机内搅拌,得混合物;将上述混合物按比例加入聚酰胺后,放入低速搅拌机内混合,再输送到双螺杆挤出机内进行混炼,挤出造粒,制得成品;该耐高温尼龙具有热变形温度高和弯曲强度(刚性)好等优点,能够有效降低尼龙、塑料制品的收缩率、翘曲变形和吸湿性,而且制造工艺简单,成本低廉。
Description
技术领域
本发明涉及尼龙及其制备领域,特别提供了一种耐高温尼龙及其制备方法。
背景技术
聚酰胺,俗称尼龙,英文简写PA,PA是广泛用于制造生产机械、化学及电气等方面的零部件,如轴承、齿轮、辊轴、叶轮、密封垫圈、管类等,在汽车、铁路、体育器材、家电等方面越来越多地使用PA制造的各种零部件。
PA具有优良的力学性能、拉伸强度、压缩强度、冲击强度和耐磨性能。由于PA的热变形温度一般在80℃左右,因此,如何提高PA的应用温度,已成为塑料业界关注的技术热点。目前,一种方法是采用玻璃纤维增强,通过在PA中加入部分玻璃纤维,可明显改善其热变形温度和物理性能,但由于玻璃纤维是柔软的线状材料,它的抗冲击强度、刚性、卫生指标都受到一定的限制。另一种方法是采用耐高温的材料与PA交替镶成不同制品,来提高PA的耐热性,例如:在PA制品生产时,采用粘合剂将普通尼龙与含有耐高温的环氧树脂、石英、玻璃纤维等材料分别包裹在外层,其虽然能够改善其耐温性,但生产工艺较为复杂,生产成本也比较高。
因此,研发一种新型的耐高温尼龙和制备方法,成为人们亟待解决的问题。
发明内容
本发明的目的在于至少解决以往尼龙存在的耐高温性能差、容易吸湿,造成翘曲变形以及生产工艺复杂,生产成本高等问题。
本发明一方面提供的技术方案为:一种耐高温尼龙,其特征在于,按重量份计,包括:硅灰石60~80份、滑石粉0~25份、云母粉0~20、偶联剂0.5~4份、聚乙烯蜡1~4份和聚酰胺20~40份。
优选,按照重量计,包括硅灰石65~75份、滑石粉10~25份、云母粉5~20份、偶联剂1~2.5份、聚乙烯蜡2~3份和聚酰胺25~35份。
进一步优选,按照重量计,包括硅灰石70份、滑石粉20份、云母粉10份、偶联剂1.5份、聚乙烯蜡3份和聚酰胺30份。
进一步优选,所述滑石粉和云母粉的粒度为800~1250目。
本发明另一方面还提供的技术方案为:一种制备耐高温尼龙的方法,其特征在于,具体步骤为:
i)将硅灰石、滑石粉和云母粉按比例进行混合,混合后进行干燥得混合无机粉体;
ii)将上述无机粉体加热至80~120℃后,加入偶联剂进行混合,再放入高速搅拌机内搅拌,得混合物;
iii)将上述混合物按比例加入聚酰胺后,放入低速搅拌机内混合,再输送到双螺杆挤出机内进行混炼,挤出造粒,制得成品。
优选,所述双螺杆挤出机内混炼的温度为 180~250℃。
本发明提供的耐高温尼龙,通过将硅灰石、滑石粉和云母粉组成的多元复合矿纤维材料与聚酰胺进行共混改性,可明显提高尼龙热变形温度,改善弯曲强度,有效降低尼龙制品的收缩率、翘曲变形和吸湿性,同时通过偶联剂和聚乙烯蜡的辅料加入,使尼龙的性能得到进一步的改善;此外,本发明提供的制备耐高温尼龙的方法,具有工艺简单,成本低廉的优点。
具体实施方式
下面结合具体的实施例对本发明进行进一步的解释,但是并不用于限制本发明的保护范围。
为了解决以往尼龙存在耐高温性能差、容易吸湿,造成翘曲变形等问题,本发明提供了一种耐高温尼龙,按重量份计,其包括:硅灰石60~80份、滑石粉0~25份、云母粉0~20、偶联剂0.5~4份、聚乙烯蜡1~4份和聚酰胺20~40份。
该耐高温尼龙通过将硅灰石、滑石粉和云母粉组成的多元复合矿纤维材料与聚酰胺进行共混改性,可明显提高尼龙热变形温度,改善弯曲强度,有效降低尼龙制品的收缩率、翘曲变形和吸湿性。
其中,1)硅灰石具有独特的针状结构,使得改性尼龙的机械性能大幅提高,尤其是弹性强度及弹性模量。同时做为优异的天然纤维,除了其补强作用,硅灰石还可大幅提高尼龙的热变形温度,明显改善尼龙制品的尺寸稳定性,有效地减少材料的收缩率及制品翘曲变形,赋予尼龙优异的加工稳定性和生产成型性能,改善尼龙制品的外观,无表面浮纤现象,使制品富于自然光泽。同时还可以避免因制品吸水而导致弯曲强度及弯曲模量下降的缺点。2)滑石粉能够提高尼龙的刚性、耐热性以及高蠕变性。3)云母粉的片状结构与纤维状硅灰石相互作用可分散材料所受的应力,提高尼龙的拉伸强度,抗冲击强度,弹性模量,热稳定性,抗疲劳蠕变性和抗磨性。4)偶联剂,在尼龙配混中,为改善合成树脂与无机填充剂或增强材料界面性能的一种塑料添加剂。又称表面改性剂。它在塑料加工过程中可降低合成树脂熔体的粘度,改善填充剂的分散度以提高加工性能,进而使制品获得良好的表面质量及机械、热和电性能。5)聚乙烯蜡可以增加产品的光泽和加工性能。
上述耐高温尼龙较优选的成分配比,按照重量计,包括硅灰石65~75份、滑石粉10~25份、云母粉5~20份、偶联剂1~2.5份、聚乙烯蜡2~3份和聚酰胺25~35份;最为优选为硅灰石70份、滑石粉20份、云母粉10份、偶联剂1.5份、聚乙烯蜡3份和聚酰胺30份。当滑石粉和云母粉的粒度为800~1250目时,制得的尼龙产品外表更为细腻,光泽。
上述耐高温尼龙的具体制备方法以及以下的实施例1~6的制备方法均按照以下的步骤进行,具体为:
i)将硅灰石、滑石粉和云母粉按比例进行混合,混合后进行干燥得混合无机粉体;
ii)将上述无机粉体加热至80~120℃后,加入偶联剂进行混合,再放入高速搅拌机内搅拌,得混合物;
iii)将上述混合物按比例加入聚酰胺后,放入低速搅拌机内混合,再输送到双螺杆挤出机内进行混炼,挤出造粒,制得成品。
双螺杆挤出机内混炼的温度优选为220~250℃。
制备方法的步骤i)中,首先将硅灰石、滑石粉和云母粉进行混合,可提高其混合的均匀程度,使制得的尼龙性能均匀。
步骤ii)中,通过加入偶联剂后放入高速搅拌机内搅拌,进行表面改性处理,使得无机粉体与树酯能够更好的相容。
步骤iii)中,将混合物表面处理后再加入聚酰胺,能够提高无机粉体的添加量,改善树酯性能。
其中,高速搅拌机和低速搅拌机是相对搅拌速度而言,但二者并没有明确的速度要求。
实施例1
一种耐高温尼龙,按重量计包括硅灰石70份、滑石粉20份、云母粉10份、偶联剂1.5份、聚乙烯蜡3份和聚酰胺30份,按照上述方法进行制备。
实施例2
一种耐高温尼龙,按重量计包括硅灰石65份、滑石粉25份、云母粉5份、偶联剂1份、聚乙烯蜡3份和聚酰胺25份,按照上述方法进行制备。
实施例3
一种耐高温尼龙,按重量计包括硅灰石75份、滑石粉10份、云母粉20份、偶联剂2.5份、聚乙烯蜡2份和聚酰胺35份,按照上述方法进行制备。
实施例4
一种耐高温尼龙,按重量计包括硅灰石60份、滑石粉25份、偶联剂0.5份、聚乙烯蜡4份和聚酰胺20份,按照上述方法进行制备。
实施例5
一种耐高温尼龙,按重量计包括硅灰石80份、云母粉20份、偶联剂4份、聚乙烯蜡1份和聚酰胺40份,按照上述方法进行制备。
实施例6
一种耐高温尼龙,按重量计包括硅灰石70份、偶联剂1.5份、聚乙烯蜡3份和聚酰胺30份,按照上述方法进行制备。
实施例7
分别在实施例1~实施例6,每个实施例中随机选取3个高温尼龙样品进行性能检测,具体检测结果,见表1(1)和表1(2)。
其中,原用配方,按重量计:低粘度玻璃纤维增强聚酰胺50份、扁平玻璃纤维40份、聚酰胺25份、阻燃剂20份和加工助剂4份,制备方法为将低粘度玻璃纤维增强聚酰胺和聚酰胺进行加热干燥,然后放入阻燃剂和加工助剂到混合机内混合,得混合物,最后将混合物和扁平玻璃纤维依次加入到螺旋杆挤出机内挤出,制得成品。
因此,从表1(1)以及表1(2)可以明确看出本发明中的高温尼龙明较传统尼龙具有较高的热变形温度,弯曲强度高,收缩率低、翘曲变形少等优点,同时,滑石粉能够明显提高尼龙的刚性、耐热性以及高蠕变性,云母粉能够提高尼龙的拉伸强度,抗冲击强度,弹性模量,热稳定性,抗疲劳蠕变性和抗磨性。
Claims (6)
1.一种耐高温尼龙,其特征在于,按重量份计,包括:硅灰石60~80份、滑石粉0~25份、云母粉0~20、偶联剂0.5~4份、聚乙烯蜡1~4份和聚酰胺20~40份。
2.按照权利要求1所述耐高温尼龙,其特征在于,按照重量计,包括硅灰石65~75份、滑石粉10~25份、云母粉5~20份、偶联剂1~2.5份、聚乙烯蜡2~3份和聚酰胺25~35份。
3.按照权利要求1所述耐高温尼龙,其特征在于,按照重量计,包括硅灰石70份、滑石粉20份、云母粉10份、偶联剂1.5 份、聚乙烯蜡3份和聚酰胺30份。
4.按照权利要求1~3任一所述耐高温尼龙,其特征在于:所述滑石粉和云母粉的粒度为800~1250目。
5.一种制备权利要求1中所述耐高温尼龙的方法,其特征在于,具体步骤为:
i)将硅灰石、滑石粉和云母粉按比例进行混合,混合后进行干燥得混合无机粉体;
ii)将上述混合无机粉体加热至80~120℃后,加入偶联剂进行混合,再放入高速搅拌机内搅拌,得混合物;
iii)将上述混合物按比例加入聚酰胺后,放入低速搅拌机内混合,再输送到双螺杆挤出机内进行混炼,挤出造粒,制得成品。
6.按照权利要求5所述制备耐高温尼龙的方法,其特征在于:所述双螺杆挤出机内混炼的温度为180~250℃。
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