CN105666889A - 一种高强度聚四氟乙烯薄膜的制备方法 - Google Patents
一种高强度聚四氟乙烯薄膜的制备方法 Download PDFInfo
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- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
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Abstract
本发明涉及高强度聚四氟乙烯薄膜的制备方法。本发明属于聚四氟乙烯薄膜技术领域。高强度聚四氟乙烯薄膜的制备方法:(1)混料:聚四氟乙烯分散树脂,过筛,加入异构烷烃类有机溶剂油,至于混料机混合均匀,过筛后,在25~60℃条件下,熟化15h以上;(2)制坯:熟化料在0.3~1.0MPa条件下,采用双向加压的方式压制成料坯;(3)推压:料坯加入到柱塞式挤出机料腔中,料腔加热至30~60℃,2~5Mpa推压成圆棒;(4)压延:将聚四氟乙烯圆棒置于双辊压延机上压制成聚四氟乙烯含油基带,然后经脱油、拉伸、高温定型,制得高强度四氟乙烯薄膜。本发明具有工艺简单、操作方便;产品高强度,耐高温,耐磨损,可承受高载荷,抗冲击性能显著等优点。
Description
技术领域
本发明属于聚四氟乙烯薄膜技术领域,特别是涉及一种高强度聚四氟乙烯薄膜的制备方法。
背景技术
目前,聚四氟乙烯(PTFE)具有优异的使用性能,具有热稳定性,能够耐高低温,长期使用温度达-250~261℃,在-100℃仍软,-200℃仍韧;其耐腐蚀性好,突出的化学惰性,能耐王水和任何浓度的强酸、强碱、有机溶剂等;耐气候好,具有塑料中最佳的老化寿命;有良好的自润滑性,摩擦系数低,且其电气性能优良,绝缘电阻高,介电常数小,是一种性能优异的高分子材料。利用糊膏成型技术,将其加工成连续长度的薄壁管、细棒、电线电缆绝缘绕包带、生料带等,广泛应用于国防军工、原子能、石油、无线电、电力机械、化学工业、纺织、建筑和医学等重要部门。
尽管聚四氟乙烯(PTFE)具有优良的物化性能,但其依然存在着某些缺陷,如其机械性能较差、耐蠕变性差、易冷流、耐磨性差、耐辐射性差、注塑成型和二次加工困难、成本高等不足,这些都能够使其应用受到一定限制。随着PTFE产能快速增加,加强PTFE改性技术,开发新型高效的PTFE复合材料,现有工艺还存在工艺复杂、成本高、产品性能不稳定等技术问题。
发明内容
本发明为解决公知技术中存在的技术问题而提供一种高强度聚四氟乙烯薄膜的制备方法。
本发明的目的是提供一种具有工艺简单、操作方便;产品高强度,耐高温,耐磨损,可承受高载荷,抗冲击性能显著,耐腐蚀,使用寿命长等特点的高强度聚四氟乙烯薄膜的制备方法。
本发明通过选用合适牌号的PTFE分散树脂和溶剂油,通过控制制备、脱油、拉伸、定型过程中的工艺参数,来获得高强度、高性能的PTFE绕包带,其厚度在0.030~0.100mm范围下,具有很高的拉伸性能和耐击穿性能,经实验表明其能够满足电线电缆绝缘绕包带的性能要求。
本发明高强度聚四氟乙烯薄膜的制备方法所采取的技术方案是:
一种高强度聚四氟乙烯薄膜的制备方法,其特点是:聚四氟乙烯薄膜的制备包括以下工艺过程:
(1)混料
聚四氟乙烯分散树脂,过10~30目筛,加入异构烷烃类有机溶剂油,至于混料机混合均匀,过筛后,在25~60℃条件下,熟化15h以上;
(2)制坯
熟化料在0.3~1.0MPa条件下,采用双向加压的方式压制成料坯;
(3)推压
料坯加入到柱塞式挤出机料腔中,料腔加热至30~60℃,在2~5Mpa的条件下推压成圆棒;
(4)压延
将聚四氟乙烯圆棒置于双辊压延机上压制成聚四氟乙烯含油基带,然后经脱油、拉伸、高温定型,制得高强度聚四氟乙烯薄膜。
本发明高强度聚四氟乙烯薄膜的制备方法还可以采用如下技术方案:
所述的高强度聚四氟乙烯薄膜的制备方法,其特点是:混料时,聚四氟乙烯分散树脂在10~25℃条件下低温存放,加入的溶剂油质量为PTFE树脂质量的10~30%,在混料桶中成倒8字形振荡摇晃15~20min,再至于混料机上混合10~30min。
所述的高强度聚四氟乙烯薄膜的制备方法,其特点是:异构烷烃类有机溶剂油为IsoperM或200#汽油。
所述的高强度聚四氟乙烯薄膜的制备方法,其特点是:过筛后,放置到烘箱中25~
60℃条件下熟化15~30h。
所述的高强度聚四氟乙烯薄膜的制备方法,其特点是:制坯时,采用双向加压的方式压制成高260~300mm的料坯。
所述的高强度聚四氟乙烯薄膜的制备方法,其特点是:压延时,压制成四氟乙烯含油基带,在300~400℃温度下定型,制品厚度为0.030~0.100mm,密度为0.5~1.1g/cm3。
本发明高强度聚四氟乙烯(PTFE)薄膜的制备过程,PTFE材料是粉状分散聚四氟乙烯,具有优良的热稳定性和电气性能、突出的化学惰性、以及低摩擦系数等卓越性能,其适用于糊膏成型,可加工成连续长度的薄壁管、细棒、电线电缆绝缘绕包带、生料带等。高强度聚四氟乙烯(PTFE)薄膜,经分切机分切,即可以获得不同宽度的PTFE线缆绝缘绕包带。
本发明具有的优点和积极效果是:
高强度聚四氟乙烯薄膜的制备方法由于采用了本发明全新的技术方案,与现有技术相比,本发明具有通过选用合适牌号的PTFE分散树脂和溶剂油,通过控制基带制备、脱油、拉伸、定型的工艺参数,获得高强度、高性能的PTFE薄膜,使得制品的拉伸强度以及耐高温性得到了显著地提高。
本发明具有工艺简单、操作方便;产品具有耐高温,耐磨损;高强度,抗冲击性能显著;绵柔、阻燃、防水、使用寿命长等优点。
具体实施方式
为能进一步了解本发明的发明内容、特点及功效,兹例举以下实施例,并详细说明如下:
实施例1
本实施例制备55μmPTFE成缆带
高强度聚四氟乙烯(PTFE)薄膜的制备方法,包括以下制备过程:
1.混料
原料选用DF-203聚四氟乙烯(PTFE)分散树脂,且原料需低温存放,使用前过15目筛,按照配比称取2kg的PTFE树脂,加入到混料桶中,再称取0.5kgIsoperM溶剂油,加入到装有PTFE树脂的混料桶中,成倒“8”字形,振荡摇晃15min,然后至于混料机上,混合30min后,过筛,放置到烘箱中,40℃条件下,熟化17h;
2.制坯
将熟化后的PTFE料在0.5MPa条件下,采用双向加压的方式压制成高300mm的料坯;
3.推压
将制好的料坯加入到柱塞式挤出机料腔中,料腔加热至40℃,在5Mpa的条件下推压成圆棒;
4.压延
将PTFE圆棒置于双辊压延机上压制成厚0.070mm、宽130mm的PTFE含油基带,然后经脱油、拉伸、定型等工序,且定型温度设定为360℃,制得高强度PTFE薄膜。
制品厚度0.055mm,密度0.76g/cm3,横向拉伸强度3.2MPa,纵向拉伸强度26.78MPa,断裂伸长率57%。使用该产品缠绕线缆,做线材时,能够起到使线材柔软、隔离的效果,在摇摆和拖链的过程中,起到很好的缓冲作用。
实施例2
本实施例制备75μmPTFE成缆带。
高强度聚四氟乙烯(PTFE)薄膜的制备方法,制备过程以下包括:
1.混料
原料选用DF-203聚四氟乙烯(PTFE)分散树脂,且原料需低温存放,使用前过15目筛,按照配比称取2kg的PTFE树脂,加入到混料桶中,再称取0.5kgIsoperM溶剂油,加入到装有PTFE树脂的混料桶中,成倒“8”字形,振荡摇晃15min,然后至于混料机上,混合30min后,过筛,放置到烘箱中,40℃条件下,熟化17h;
2.制坯
将熟化后的PTFE料在0.5MPa条件下,采用双向加压的方式压制成高300mm的料坯;
3.堆压
将制好的料坯加入到柱塞式挤出机中,料腔加热至40℃,在5Mpa的条件下推压成圆棒;
4.压延
将PTFE圆棒置于双辊压延机上压制成厚0.095mm、宽120mm的PTFE含油绕包带,然后经脱油、拉伸、定型等几道工序,且定型温度设定为360℃,制得高强度PTFE膜。
制品厚度0.075mm,密度0.72g/cm3,横向拉伸强度2.7MPa,纵向拉伸强度24.89MPa,断裂伸长率49%。
本实施例通过选用合适牌号的PTFE分散树脂和溶剂油,通过控制制备、脱油、拉伸、定型过程中的工艺参数,来获得高强度、高性能的PTFE薄膜。产品耐高温,可在240℃条件下长期使用;高强度,拉伸性能显著;绝缘性好,具有所述的优越的耐击穿性能,且产品具有绵柔、阻燃、防水、使用寿命长等积极效果。
Claims (6)
1.一种高强度聚四氟乙烯薄膜的制备方法,其特征是:聚四氟乙烯薄膜的制备包括以下工艺过程:
(1)混料
聚四氟乙烯分散树脂,过10~30目筛,加入异构烷烃类有机溶剂油,至于混料机混合均匀,过筛后,在25~60℃条件下,熟化15h以上;
(2)制坯
熟化料在0.3~1.0MPa条件下,采用双向加压的方式压制成料坯;
(3)推压
料坯加入到柱塞式挤出机料腔中,料腔加热至30~60℃,在2~5Mpa的条件下推压成圆棒;
(4)压延
将聚四氟乙烯圆棒置于双辊压延机上压制成聚四氟乙烯含油基带,然后经脱油、拉伸、高温定型,制得高强度聚四氟乙烯薄膜。
2.根据权利要求1所述的高强度聚四氟乙烯薄膜的制备方法,其特征是:混料时,聚四氟乙烯分散树脂在10~25℃条件下低温存放,加入的溶剂油质量为PTFE树脂质量的10~30%,在混料桶中成倒8字形振荡摇晃15~20min,再至于混料机上混合10~30min。
3.根据权利要求1或2所述的高强度聚四氟乙烯薄膜的制备方法,其特征是:异构烷烃类有机溶剂油为IsoperM或200#汽油。
4.根据权利要求1所述的高强度聚四氟乙烯薄膜的制备方法,其特征是:过筛后,放置到烘箱中25~60℃条件下熟化15~30h。
5.根据权利要求1所述的高强度聚四氟乙烯薄膜的制备方法,其特征是:制坯时,采用双向加压的方式压制成高260~300mm的料坯。
6.根据权利要求1所述的高强度聚四氟乙烯薄膜的制备方法,其特征是:压延时,压制成四氟乙烯含油基带,在300~400℃温度下定型,制品厚度为0.030~0.100mm,密度为0.5~1.1g/cm3。
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