Method for improving impulse breakdown strength of electrically insulating materials
申请人:Nippon Petrochemicals Co., Ltd.
公开号:EP0180771A1
公开(公告)日:1986-05-14
The present invention provides a method for improving the impulse breakdown strength of an electrically insulating material which is characterized by employing, as said electrical insulating material, an ethylene copolymer prepared by high-pressure radical polymerization of ethylene or a mixture of ethylene and another monomer in the presence. of at least one compound selected from the group consisting of one- to three-ring aromatic compounds (except styrene and substituted styrenes each having a single ring) each having one carbon-carbon double bond in one molecule, at a polymerization pressure of 500 to 4,000 kg/cm2 at a polymerization temperature of 50 to 400°C, wherein said ethylene copolymer contains 0.005 to 1 mol% of a unit derived from said aromatic compound as component of the polymer.
本发明提供了一种提高电绝缘材料脉冲击穿强度的方法,其特征在于作为所述电绝缘材料,采用乙烯共聚物,该乙烯共聚物是由乙烯或乙烯与另一种单体的混合物在存在下列物质的情况下通过高压自由基聚合制备的。在聚合压力为 500 至 4000 公斤/厘米2、聚合温度为 50 至 400 摄氏度的条件下,至少含有一种选自单环至三环芳香族化合物(苯乙烯和具有单环的取代苯乙烯除外)组的化合物,其中所述乙烯共聚物含有 0.005 至 1 摩尔%由所述芳香族化合物衍生的单元作为聚合物的组分。