注射成型热塑性塑料的导电改性:电性能和静电涂漆性

J. Helms, E. Blais, M. Cheung, J. Schroeder, T. Derengowski
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引用次数: 2

摘要

导电性改性热塑性基板已经开发出来,使用低水平的导电性碳填料,重量< 6%,而不牺牲这些材料在汽车市场上表现出的良好的机械和流变性能。当样品被压缩成型时,这些材料的整体电学性能表现出传统的渗透行为。导电改性注塑材料表现出高表面电阻率,通常大于10/sup 16/欧姆厘米,这是由相对较低的内部电阻率补偿的,小于10/sup 8/欧姆厘米。根据岩心电阻率测量和静电耗散结果确定了静电可涂性的阈值。该磁芯电阻率必须小于10/sup 9/欧姆厘米,才能发生电荷耗散,并观察到漆膜结构的任何显著增加。表面到岩心的电阻率转换与材料冷却速度密切相关,因此与取样区域到注塑模具表面的距离密切相关。使用这些导电改性材料,相对于未改性的样品,高固体涂料涂层膜,构建和转移效率增加了100%以上。在静电喷涂过程中使用导电改性的热塑性基材,可以在保持底漆与基材表面之间的附着力时,消除对导电底漆的需要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Conductive modification of injection molded thermoplastics: electrical properties and electrostatic paintability
Conductively modified thermoplastic substrates have been developed using low levels of conductive carbon fillers, <6 weight percent, without sacrificing the favorable mechanical and rheological properties exhibited by these materials for the automotive market. The bulk electrical properties of these materials exhibit traditional percolation behavior when the samples are compression molded. Conductively modified injection molded materials exhibit a high surface resistivity, typically greater than 10/sup 16/ ohm cm, which is compensated by a relatively low resistivity interior, less than 10/sup 8/ ohm cm. The threshold for electrostatic paintability has been identified based on core resistivity measurements and electrostatic dissipation results. This core resistivity must be less that 10/sup 9/ ohm cm for charge dissipation to occur and for any significant increase in paint film builds to be observed. The surface to core resistivity transformation is intimately related to the material cooling rate and thus the distance of the sampled area to the injection molding tool surface. Using these conductively modified materials, high solids paint coating film, builds and transfer efficiency have been increased in excess of 100 percent relative to unmodified samples. The use of conductively modified thermoplastic substrates in the electrostatic painting process can eliminate the need for conducting primers when adhesion between the base coat and substrate surface is maintained.
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