CN105835482A - 一种用于大型发电机组的高导热少胶云母带 - Google Patents
一种用于大型发电机组的高导热少胶云母带 Download PDFInfo
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Abstract
本发明属于绝缘技术领域,特别涉及一种用于大型发电机组电机线圈的少胶云母带及其制备工艺。少胶云母带由高导热云母纸、导热粉体或导热纤维、定纹玻璃布和高导热胶粘剂制作而成。产品导热性好、电气强度高、厚度薄,包扎线圈时可以大幅降低绝缘厚度,有利于提高电机的比功率,提高发电机的效率。
Description
技术领域
本发明属于绝缘技术领域,特别涉及一种用于大型发电机组电机线圈的少胶云母带。
背景技术
大型发电机组已成为国内发电机行业发展的主流方向,其市场份额逐步扩大。随着发电机的大型化,对于发电机绝缘的导热性的应用日益迫切。少胶云母带作为大型发电机绝缘的重要组成部分,其性能直接影响到发电机设计参数的选择。高导热的少胶云母带可以提高发电机的比功率和效率,对少胶云母带的导热性做出主要贡献的是添加在其中的无机导热材料,目前现有技术中的云母带中无机物含量最大可以达到88~90%这样,其余为胶粘剂成份,无机物含量能够超过92%的云母带产品目前还无法制备出来。
发明内容
本发明提供了一种少胶云母带由高导热云母纸、导热粉体或导热纤维、定纹玻璃布和高导热胶粘剂制作而成。产品导热性好、电气强度高、厚度薄,包扎线圈时可以大幅降低绝缘厚度,有利于提高电机的比功率,提高发电机的效率。
本发明的少胶云母带为5层结构的复合材料,第一层为云母纸;第二层为胶粘剂;第三层为导热纤维;第四层为胶粘剂;第五层为玻璃布,少胶云母带整体厚度为0.14±0.01mm,
其中,第一层的云母纸可以由纯的非煅烧云母制备而成,也可以由非煅烧云母与导热粉体混抄制作而成,定量为200±10g/m2,
第二层和/或第四层中的胶粘剂为颗粒状的高导热胶粘剂,重量为少胶云母带总质量的2%~4%,高导热胶粘剂主要成分为PP掺杂导热粉体,
第三层导热纤维定量为10-20g/m2,
作为优选,导热纤维可选择长纤维,长度为50~70mm,在少胶云母带整体厚度为0.14±0.01mm的基础上,选择该长度的纤维,一方面可以在中间层区域形成互穿网络交错结构,而后续的热压操作则进一步提高了纤维层本身的紧密程度;更重要的是,在与中间层相邻的颗粒状胶粘剂熔融和热压过程中,可实现中间层中多根长纤维的两端插入到上下两面的粘结材料中,以及长纤维的某一(若干)段被嵌入到上下层的粘结材料中,相当于是上下面的粘结材料在熔融热压过程中同时向中间层的交错网络纤维层有一定程度的渗透,从而冷却后与纤维网络固定粘结在一起,产生固定效果;
第五层的玻璃布为0.03mm厚度的定纹玻璃布,优选无碱玻璃丝布,定量为18±1g/m2。
本发明还提供了一种上述少胶云母带的制备方法,具体操作为:于玻璃布单面先撒上一层胶粘剂后,再撒导热纤维,最后再覆盖撒上一层粘结剂,经过第一段烘箱,温度为60~80℃,处理1~3min,再与云母纸压辊热压复合后,经过第二段烘箱,温度为100~120℃,处理1~3min,最后经收卷、分切而得到少胶云母带。
本发明的有益效果在于:普通的少胶云母带无机物含量大致为88~90%(云母带复合材料中除了胶粘剂以外的云母纸、导热纤维、玻璃布的总含量,下同),导热系数为0.35W/(m·K);本发明中,在采用长导热纤维作为导热无机材料的基础上,仅仅将导热纤维层的上下两面通过粘结剂分别与玻璃布和云母纸相粘结,在颗粒状胶粘剂熔融和热压过程中导热纤维束被固定在中间层,并同时实现对上下层的连接,从而避免了导热无机材料被粘结剂全部覆盖,这样有助于少胶云母带中无机材料添加量的增加。本发明所制备出的少胶云母带中无机物含量高达96~98%,导热系数为0.8W/(m·K);并且电气强度高,绝缘性能优良,且产品导热性好、厚度薄,包扎线圈时可以大幅降低绝缘厚度,有利于提高电机的比功率,提高发电机的效率和经济性。
本发明的生产工艺中,对于粘结剂和粉体不是采用传统的刷胶后复合,而是采用均匀撒落后通过辊热压的方式完成云母带的粘合,实现了在大量采用导热粉体后云母带的透气性能依然得到较好的保持,便于后期即使使用含一定导热粉体的VPI树脂,也能满足浸透性的要求。
附图说明
图1为实施例1中的少胶云母带的结构示意图,其中,1—云母纸、2—高导热胶粘剂、3—导热纤维、4—高导热胶粘剂、5—定纹玻璃布。
具体实施方式
实施例1
如附图1所示:一种用于大型发电机组电机线圈的少胶云母带,由第一层云母纸1、第二层颗粒状高导热胶粘剂2、第三层导热纤维3、第四层颗粒状高导热胶粘剂4、第五层定纹玻璃布5组成,
第一层的云母纸为非煅烧云母制作而成,定量196g/m2;
第二层的颗粒状高导热胶粘剂主要成分为PP掺杂导热粉体,用量为少胶云母带总质量的1.2%;
第三层的导热纤维采用长度为50~70mm的长导热纤维,定量为20g/m2,
第四层的颗粒状高导热胶粘剂主要成分同第二层,为PP掺杂导热粉体,为少胶云母带总质量的1.2%;
第五层的玻璃布为0.03mm厚度的定纹玻璃布,定量为19g/m2。
本实施例中的少胶云母带按照如下工艺制备:
于定纹玻璃布5上单面先撒上颗粒状高导热胶粘剂2后,再撒导热纤维3,最后再覆盖撒上颗粒状高导热胶粘剂4,经过第一段烘箱,温度为70℃,处理2min,再与云母纸1辊热压复合后,经过第二段烘箱,温度为110℃,处理2min,最后经收卷、分切而得到少胶云母带。
本实施例中制备的少胶云母带厚度为0.135mm,介电常数33MV/m,拉伸强度88N/mm,导热系数0.85W/(m·K),于70N张力下进行包扎产品不分层,使用完全合格。
Claims (8)
1.一种少胶云母带,其特征在于:所述的少胶云母带为5层结构的复合材料,第一层为云母纸;第二层为胶粘剂;第三层为导热纤维;第四层为胶粘剂;第五层为玻璃布。
2.如权利要求1所述的少胶云母带,其特征在于:所述的少胶云母带整体厚度为0.14±0.01mm。
3.如权利要求1所述的少胶云母带,其特征在于:所述的第一层云母纸定量为200±10g/m2。
4.如权利要求1所述的少胶云母带,其特征在于:第二层和/或第四层中的胶粘剂为颗粒状的高导热胶粘剂,重量为少胶云母带总质量的2%~4%。
5.如权利要求1所述的少胶云母带,其特征在于:所述的第三层导热纤维定量为10~20g/m2。
6.如权利要求1所述的少胶云母带,其特征在于:所述的第三层导热纤维的长度为50~70mm。
7.如权利要求1所述的少胶云母带,其特征在于:所述的第五层的玻璃布为0.03mm厚度的定纹玻璃布,定量为18±1g/m2。
8.如权利要求1至7任一项所述的少胶云母带的制备方法,其特征在于:所述制备方法为,
于玻璃布单面先撒上一层胶粘剂后,再撒导热纤维,最后再覆盖撒上一层粘结剂,经过第一段烘箱,温度为60~80℃,处理1~3min,再与云母纸压辊热压复合后,经过第二段烘箱,温度为100~120℃,处理1~3min,最后经收卷、分切而得到少胶云母带。
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CN110233009B (zh) * | 2019-05-23 | 2020-10-23 | 苏州苏绝电工材料股份有限公司 | 一种耐高温复合云母管的制造方法及制造装置 |
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