CN110600211A - 一种改性poe塑料作外层的复合绝缘子芯棒 - Google Patents
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Abstract
一种改性POE塑料作外层的复合绝缘子芯棒。芯棒内层为环氧玻纤芯棒、外层为改性POE塑料,两者用粘合剂粘接;内层环氧玻纤芯棒与外层改性POE塑料的厚度比例为5‑10∶1。环氧玻纤芯棒为玻纤增强的环氧树脂实心拉挤棒;粘合剂由氯化聚丙烯、异氰酸酯、偶联剂和溶剂配制而成;环氧玻纤芯棒起到绝缘子主要支撑作用,外层改性POE塑料有效缓冲内层环氧玻纤芯棒的热胀冷缩作用,并具有优异的耐水、耐酸碱、绝缘等性能,保护内部环氧玻纤芯棒,防止其水解、脆断,大幅度延长复合绝缘子的使用寿命。
Description
技术领域
本发明是一种复合绝缘子芯棒,涉及电力行业输变电用绝缘子技术领域。
背景技术
复合绝缘子具有质量轻、强度高、耐污闪等特点,在高压输变电等应用越来越广泛。对于输变电用复合支柱绝缘子及高铁用车顶弓复合绝缘子来说,还要求绝缘子的抗张强度和抗弯强度足够高,进而要求绝缘子芯棒的直径要足够大(一般直径在50mm及以上)。该类绝缘子芯棒一般采用环氧玻纤复合材料制成,成型方式可有各种规格的拉挤棒捆绑在一起进行整体灌注,或内部为拉挤芯棒,外层用纤维缠绕后浇注环氧胶。如中国发明专利申请CN106531376A公开了一种预制体、绝缘子芯棒及制备方法,预制体包括内芯棒和卷绕在该内芯棒外表面的玻璃纤维编织卷绕层,而后将预制体置于成型模具中,利用真空注射成型工艺将环氧树脂注入成型模具中以逐渐浸渍芯棒预制体,然后在一定温度下固化预制体获得强度相对比较高的环氧玻纤芯棒;用硬质高强度聚烯烃作伞裙(以聚乙烯和聚丙烯为混合树脂基材),具有优异的电气特性和机械性能。然而当上述硬质聚烯烃伞裙和环氧玻纤芯棒结合制成复合支柱绝缘子或车顶弓复合绝缘子时,经高低温、水煮试验等,会出现聚烯烃伞裙变形、开裂或破损现象,严重地会发生伞裙与芯棒脱开现象。这是由于环氧玻纤芯棒直径较大,热胀冷缩变化明显,而硬质聚烯烃作伞裙材料不能适应这种变化,从而出现开裂、破损或脱开现象。
发明内容
本发明目的是提供一种复合绝缘子芯棒,解决硬质聚烯烃伞裙与环氧玻纤芯棒不能匹配使用,从而无法制备以硬质聚烯烃为伞裙的复合支柱绝缘子或车顶弓复合绝缘子的技术问题。
一种改性POE塑料作外层的复合绝缘子芯棒。本发明采用以下技术方案:
所述芯棒内层为环氧玻纤芯棒、外层为改性POE塑料,两者用粘合剂粘接;内层环氧玻纤芯棒与外层改性POE塑料的厚度比例为5-10∶1。
所述的环氧玻纤棒为玻纤增强的环氧树脂实心拉挤棒。
所述的粘合剂由100份氯化聚丙烯、5-20份异氰酸酯、0.1-10份偶联剂、300-1000份溶剂配制而成;进一步,异氰酸酯是异弗尔酮二异氰酸酯、六亚甲基二异氰酸酯、聚合MDI的一种或数种混合而成;偶联剂优选环氧基、乙烯基硅烷偶联剂一种或数种混合而成;溶剂是丁酮、戊酮、甲苯、二甲苯的一种或数种混合而成。
所述的改性POE塑料组成:按重量份,50-80份POE(乙烯和辛烯共聚的热塑性弹性体)、1-30份聚丙烯、1-30份聚乙烯、1-15份十溴二苯乙烷、1-5份三氧化二锑、0.2-0.5份抗氧剂、0.5-1.5份硅酮、0.2-0.5份光稳定剂。
所述的环氧玻纤棒直径根据绝缘子的支撑负荷要求,一般直径在50mm及以上;内层环氧玻纤芯棒与改性POE塑料外层的厚度比例为5-10∶1。
改性POE塑料作外层的复合绝缘子芯棒的制备方法,包括如下步骤:
1)表面处理步骤:将环氧玻纤棒的外表面进行喷砂或砂纸打磨处理,然后采用易挥发的有机溶剂进行表面处理,从而形成表面处理后的内芯棒;
2)涂粘合剂步骤:将粘合剂均匀涂刷在表面处理过的内芯棒上;室温晾干10分钟以上,80-100℃烘干2小时及以上;
3)制备POE塑料粒子步骤:按比例配制改性POE塑料材料各组份,在60℃充分混合搅拌5分钟,双螺杆挤出(180-200℃)、水冷、热风干燥造粒,得到改性POE塑料粒子。
4)复合芯棒制备步骤:将已涂胶的内芯棒放入模具中,将改性POE塑料粒子在注塑机中高温高压(10MPa,180-230℃)注入模具成型,降温冷却出模,制备出本发明的芯棒。
与现有技术相比,本发明有益效果:
本发明芯棒的内层为环氧玻纤芯棒,外层为改性POE塑料,两者用粘合剂粘接。该芯棒尤其适用于制备以硬质聚烯烃为伞裙的复合支柱绝缘子或车顶弓复合绝缘子,(1)较大直径的环氧玻纤芯棒起到复合绝缘子主要支撑作用,(2)改性POE塑料,分子结构中有辛烯的柔软链卷曲结构和结晶的乙烯链作为物理交联点,既具有良好的加工流动性,与硬质聚烯烃伞裙相容性好、结合牢固,又具有优异的韧性和弹性,缓冲大直径的环氧玻纤芯棒的热胀冷缩作用,解决热胀冷缩导致硬质聚烯烃伞裙破损问题,(3)改性POE塑料,分子为饱和的碳氢结构,具有优异的耐水、耐酸碱、绝缘等性能,起到保护环氧玻纤芯棒的作用,防止环氧玻纤芯棒的水解、脆断,大幅度延长复合绝缘子芯棒的使用寿命,(4)粘合剂为异氰酸酯改性氯化聚丙烯胶,与环氧玻纤芯棒和改性POE塑料粘合力强。
具体实施方式
实施例1
一种改性POE塑料作外层的复合绝缘子芯棒。
环氧玻纤芯棒采用直径为60mm玻纤增强的环氧树脂实心拉挤棒。
粘合剂由100份氯化聚丙烯、10份聚合MDI、4份环氧硅烷偶联剂、600份戊酮配制而成。
改性POE塑料,按重量份,由65份POE、30份聚丙烯、5份聚乙烯、5份十溴二苯乙烷、1.5份三氧化二锑、0.2份抗氧剂、0.5份硅酮、0.2份光稳定剂组成。
环氧玻纤芯棒与改性POE塑料层的厚度比例为6∶1。
制备包括如下步骤:
1)表面处理步骤:将环氧玻纤芯棒的外表面进行喷砂或砂纸打磨处理,然后采用易挥发的有机溶剂进行表面处理,从而形成表面处理后的内芯棒;
2)涂粘合剂步骤:将粘合剂均匀涂刷在表面处理过的内芯棒;室温晾干10分钟,80-100℃烘干2小时;
3)制备改性POE塑料粒子步骤:按比例称取改性POE塑料各组份,在60℃充分混合搅拌5分钟,双螺杆挤出(180-200℃)、水冷、热风干燥造粒,得到改性POE塑料粒子。
4)制备复合芯棒步骤:将涂胶的内芯棒放入模具中,将改性POE塑料粒子在注塑机中高温高压(10MPa,180-230℃)注入模具成型,降温冷却出模,制备出本发明的复合芯棒。
主要性能:本实施例制备的芯棒拉伸强度为60kN,抗弯强度为16kN,切割成10mm高度的芯棒圆柱体染色渗透试验合格,切割成30mm高度的芯棒圆柱体在水煮100h后12kV下泄漏电流小于400A。
实施例2
一种改性POE塑料作外层的复合绝缘子芯棒
环氧玻纤芯棒采用直径为80mm玻纤增强的环氧树脂实心拉挤棒。
粘合剂由100份氯化聚丙烯、8份聚合MDI、2份异弗尔酮二异氰酸酯、5份乙烯基硅烷偶联剂、300份戊酮、200份二甲苯配制而成。
改性POE塑料按重量份,由75份POE、5份聚丙烯、20份聚乙烯、6份十溴二苯乙烷、2份三氧化二锑、0.3份抗氧剂、0.5份硅酮、0.3份光稳定剂组成。
环氧玻纤芯棒与改性POE塑料层的厚度比例为8∶1。
制备包括如下步骤:
1)表面处理步骤:将环氧玻纤棒的外表面进行喷砂或砂纸打磨处理,然后采用易挥发的有机溶剂进行表面处理,从而形成表面处理后的内芯棒;
2)涂粘合剂步骤:将粘合剂均匀涂刷在表面处理过的内芯棒上;室温晾干15分钟,80-100℃烘干3小时;
3)制备改性POE塑料粒子步骤:按比例称取改性POE塑料各组份,在60℃充分混合搅拌5分钟,双螺杆挤出(180-200℃)、水冷、热风干燥造粒,得到改性POE塑料粒子。
4)制备芯棒步骤:将涂胶的内芯棒放入模具中,将改性POE塑料粒子在注塑机中高温高压(10MPa,180-230℃)注入模具成型,降温冷却出模,制备出本发明的芯棒。
主要性能:本实施例制备的芯棒抗拉强度106kN,抗弯强度为21kN,切割成10mm高度的芯棒圆柱体染色渗透试验合格,切割成30mm高度的芯棒圆柱体在水煮100h后12kV下泄漏电流小于600μA。
Claims (1)
1.一种改性POE塑料作外层的复合绝缘子芯棒,芯棒内层为环氧玻纤芯棒,其特征在于外层为改性POE塑料,两者用粘合剂粘接;内层环氧玻纤芯棒与外层改性POE塑料的厚度比例为5-10∶1。
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