CN110423394A - 一种具有长效憎水特性的聚烯烃绝缘子材料 - Google Patents
一种具有长效憎水特性的聚烯烃绝缘子材料 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
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Abstract
一种具有长效憎水特性的聚烯烃绝缘子材料,按重量份,由40‑55份聚乙烯、30‑50份聚丙烯、8‑20份十溴二苯乙烷、3‑7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份光稳定剂和1‑10份改性硅油组合物组成。其中改性硅油组合物是由脂肪酸与侧链氨基硅油在氮气保护下,80‑150℃下反应数小时制备得到的,作为聚烯烃绝缘材料的憎水迁移剂使用。本发明用于聚烯烃绝缘子伞套/护套,满足绝缘子对电气绝缘性、阻燃性及机械性能要求,更赋予其长期有效的憎水性、憎水性迁移及防污等性能。
Description
技术领域
本发明是一种具有长效憎水特性的聚烯烃绝缘子材料,属于绝缘子材料制造领域。
背景技术
绝缘子是架空输电线路上导线和杆塔机械相连的重要组成,起到导线与杆塔的绝缘以及增加爬电距离等作用。目前,硅橡胶复合绝缘子已成为输电线路中发展最快、应用最广泛的第三代绝缘子,具有质量轻、运输安装方便、耐电晕、耐臭氧等综合性能,尤其是其具有优异的憎水性以及憎水性迁移特性,可使绝缘子表面的憎水性透过附着于伞套上的污层,使污层表面具有憎水性,从而一定程度上避免绝缘子在脏污潮湿条件下发生沿面闪络导致污闪停电事故。发明专利申请CN107325563A涉及一种超强憎水自洁性材料,原料包括氟烷基乙烯基硅橡胶、戊烷基硅树脂、苯基聚硅氧烷、氟醚撑聚硅氧烷、二甲基二乙氧基硅烷、氨基硅氧烷、乙烯基硅烷偶联剂等,制备的超强憎水自洁性复合绝缘子具有抗腐蚀、抗盐雾、抗潮湿、耐油污、防结垢和优越的防污性能。
但由于硅橡胶绝缘材料的本体强度较低、刚性不足,制成的伞套在线路安装或检修时易被踩踏损害、鸟啄食破坏以及老化开裂损坏等现象,对其长期应用可靠性带来不利影响。为解决硅橡胶绝缘子强度较低的问题,目前国内外正致力于聚合物绝缘子的研发:如发明专利申请CN109135002A公开了一种聚合物绝缘子材料及制备方法,材料由聚乙烯、聚丙烯、甲基硅橡胶和无机填料组成,按照质量百分比,聚乙烯占40-55%,聚丙烯占5-15%,甲基硅橡胶占10-15%(平均分子量为50万-60万)和填料占15-45%,发明目的是解决聚合物绝缘子材料耐电腐蚀性能较差的问题。
虽然聚烯烃绝缘子材料已开始被研发及试用,但主要关注方面在其机械性能、绝缘性能及阻燃性能等方面,憎水性以及憎水性迁移设计考虑不足,原因可能在于通用的小分子硅油类憎水迁移剂与聚烯烃材料相容性很差,不能按需添加;即使在聚烯烃材料中勉强添加少量硅油迁移剂,亦会很快迁移出绝缘子表面,对聚烯烃绝缘子的长期使用不利,尤其在污染严重地区,会发生绝缘子污闪严重影响输电安全。
发明内容
本发明是一种具有长效憎水特性的聚烯烃绝缘子材料,用作聚烯烃绝缘子伞套/护套,在满足绝缘子优异的电气绝缘性、阻燃性及机械性能基础上,赋予其长期憎水性、憎水性迁移及防污等性能。
本发明采用以下技术方案,按重量份:40-55份聚乙烯、30-50份聚丙烯、8-20份十溴二苯乙烷、3-7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份光稳定剂和1-10份改性硅油组合物组成。
所述的聚丙烯和聚乙烯的平均分子量为10万-20万;所述的改性硅油组合物是由脂肪酸与侧链氨基硅油反应制备得到的,脂肪酸与侧链氨基硅油的重量比为1∶7.5-30。
进一步,所述的脂肪酸由辛酸、壬酸、月桂酸、硬脂酸、木蜡酸、蜡酸、虫漆蜡酸、油酸、芥酸或二十碳烯酸中的一种或数种混合组成的。
进一步,所述侧链氨基硅油由氨基重量含量为0.05-0.3%的硅油、氨基重量含量为0.4-1.5%的硅油一种或混合组成的。优选地,氨基硅油分子量为1000-50000。
进一步,所述的改性硅油组合物合成步骤为:在反应瓶中按比例加入脂肪酸和侧链氨基硅油,搅拌条件下脱气数分钟,充入氮气(或氩气)保护,在80-150℃下反应数小时,再在该温度下真空搅拌脱气反应0.5-3小时,冷却得到改性硅油组合物。
与现有技术相比,本发明有益效果:
本发明采用一类由脂肪酸改性的硅油组合物作为憎水迁移剂,制备的聚烯烃绝缘子材料具有长效憎水特性,具有以下优点:(1)由于普通硅油类憎水迁移剂与聚烯烃相容性差,不能以较多含量加入聚烯烃中,从而影响其憎水性及憎水性迁移。而本发明中使用的脂肪酸,其碳氢结构主链与聚烯烃材料分子结构类似、相容性良好,引入到氨基硅油中,提高了改性硅油组合物与聚烯烃的相容性,使改性硅油组合物可以作为一种新颖的憎水迁移剂加入聚烯烃材料中。(2)在通常硅橡胶绝缘子中,只能通过加入不同分子量硅油来调控硅油向绝缘子表面迁移的时间,从而获得较长时间的憎水目的。本发明采取上述方法,利用脂肪酸与不同分子量氨基硅油反应,制备出不同分子量的改性硅油组合物,从而控制迁移时间;还可以进一步调控改性硅油中脂肪酸的主链长短与数量,采取不同碳原子数的脂肪酸与不同氨基含量的硅油反应的技术方案,以有效调控改性硅油与聚烯烃的相互作用,使制备的改性硅油组合物,具有不同表面迁出时间,从而使绝缘子表面具有长期有效的憎水性和憎水性迁移特性。(3)改性硅油组合物迁移到绝缘子表面时,其主链硅油附在表面、侧链的碳氢长链与下面聚烯烃分子产生相互作用,硅油就像浮萍一样覆盖在聚烯烃绝缘子表面,增加其憎水耐久性;(4)改性硅油组合物是一类具有柔顺链段的齐聚物,加入到聚烯烃中起到增韧作用,提高聚烯烃材料的耐寒性。由此,本发明大大提升了聚烯烃绝缘子材料的长期憎水性及憎水迁移性效果,提高了输电线路绝缘子运行可靠性和使用寿命。
具体实施方式
实施例1
具有长效憎水特性的聚烯烃绝缘子材料,按以下重量配比:由50份聚乙烯、45份聚丙烯、20份十溴二苯乙烷、5份三氧化二锑、0.3份抗氧剂、1份硅酮、0.3份光稳定剂、2.5份改性硅油组合物组成。
所述的改性硅油组合物合成如下:在反应瓶中加入油酸1克、氨基重量含量为0.3%的侧链氨基硅油(分子量约为5000)9克、氨基重量含量为0.8%的侧链氨基硅油(分子量约为20000)10克,搅拌脱气1分钟,充入氮气保护,升温至100℃下反应4小时,再在该温度下真空搅拌脱气反应1.5小时,冷却得到改性硅油组合物。
将上述材料在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,得到一种具有长效憎水特性的聚烯烃绝缘子材料。
性能测试:将聚烯烃粒子在注塑机中高温高压(10MPa,180-230℃)注入模具成型,测得拉伸强度19.5MPa、拉断伸长率300%、表面电阻率为7.1×1015Ω、喷水法分级为HC1级、水接触角102℃;水中浸泡96小时后保持HC等级为1、水接触角101℃;在模拟污秽下(标准灰密(NSDD)=0.5mg/cm2,盐密(SDD)=0.1mg/cm2),憎水性迁移96小时,HC等级为3、水接触角87℃。
实施例2
具有长效憎水特性的聚烯烃绝缘子材料,按以下重量配比:由50份聚乙烯、45份聚丙烯、20份十溴二苯乙烷、5份三氧化二锑、0.3份抗氧剂、1份硅酮、0.3份光稳定剂、4.5份改性硅油组合物组成。
所述的改性硅油组合物合成如下:在反应瓶中加入木蜡酸1克、辛酸1克、氨基重量含量为0.3%的侧链氨基硅油(分子量约为5000)30克,搅拌脱气1分钟,充入氮气保护,升温至100℃下反应4小时,再在该温度下真空搅拌脱气反应1.5小时,冷却得到改性硅油组合物。
将上述材料在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,得到一种具有长效憎水特性的聚烯烃绝缘子材料。
性能测试:将聚烯烃粒子在注塑机中高温高压(10MPa,180-230℃)注入模具成型,测得拉伸强度20MPa、拉断伸长率350%、表面电阻率为7.2×1015Ω、喷水法分级为HC1级、水接触角103℃;水中浸泡96小时后保持HC等级为1、水接触角102℃;在模拟污秽下(标准灰密(NSDD)=0.5mg/cm2,盐密(SDD)=0.1mg/cm2),憎水性迁移96小时,HC等级为3、水接触角89℃。
实施例3
具有长效憎水特性的聚烯烃绝缘子材料,按以下重量配比,由55份聚乙烯、45份聚丙烯、18份十溴二苯乙烷、6份三氧化二锑、0.25份抗氧剂、1份硅酮、0.25份光稳定剂、5份改性硅油组合物等组成。
所述的改性硅油组合物合成如下:在反应瓶中加入油酸0.5克、壬酸0.5克、芥酸0.5克、氨基重量含量为0.2%的侧链氨基硅油(分子量约为5000)10克、氨基重量含量为0.8%的侧链氨基硅油(分子量约为20000)15克,搅拌脱气1分钟,充入氮气保护,升温至100℃下反应3小时,再在该温度下真空搅拌脱气反应1小时,冷却得到改性硅油组合物。
将上述材料在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,得到一种具有长效憎水特性的聚烯烃绝缘子材料。
性能测试:将聚烯烃粒子在注塑机中高温高压(10MPa,180-230℃)注入模具成型,测得拉伸强度18MPa、拉断伸长率400%、表面电阻率为6.5×1015Ω、喷水法分级为HC1级、水接触角103.5℃;水中浸泡96小时后保持HC等级为1、水接触角101.5℃;在模拟污秽下(标准灰密(NSDD)=0.5mg/cm2,盐密(SDD)=0.1mg/cm2),憎水性迁移96小时,HC等级为3、水接触角90℃。
Claims (4)
1.一种具有长效憎水特性的聚烯烃绝缘子材料,按重量份:40-55份聚乙烯、30-50份聚丙烯、8-20份十溴二苯乙烷、3-7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,其特征在于还有1-10份改性硅油组合物。
2.根据权力要求1所述的具有长效憎水特性的聚烯烃绝缘子材料,其特征在于改性硅油组合物是由脂肪酸与侧链氨基硅油反应制备得到的,脂肪酸与侧链氨基硅油的重量比为1∶7.5-30。
3.根据权力要求2所述的具有长效憎水特性的聚烯烃绝缘子材料,其特征在于脂肪酸是由辛酸、壬酸、月桂酸、硬脂酸、木蜡酸、蜡酸、虫漆蜡酸、油酸、芥酸或二十碳烯酸中的一种或数种混合组成的。
4.根据权力要求2所述的具有长效憎水特性的聚烯烃绝缘子材料,其特征在于侧链氨基硅油是由氨基重量含量为0.05-0.3%的硅油、氨基重量含量为0.4-1.5%的硅油一种或数种混合组成的,氨基硅油分子量为1000-50000。
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