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橡套电缆内部铜丝发黑的主要原因和发黑原理

    橡套电缆北京快三走势图的铜丝发黑是一种常见的现象,很多人以为这跟橡套电缆的设计及橡套的配方有关,今天我们从橡套电缆的结构、加工工艺的角度来分析下,橡套电缆铜丝发黑的主要原因和发黑原理!

    CONGXIANGTAODIANLANJIEGOUFENXI

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    2、橡套电缆中硫磺向绝缘橡皮和铜线表面的迁移前苏联科学家应用放射性同位素证实了电缆护套橡胶中硫扩散的可能性。以天然橡胶为基的硫化胶中,在130-150℃的温度下,游离硫的扩散系数约为10-6cm2/s。连续硫化的生产厂,硫化护套橡胶时,温度在185-200℃之间,这个扩散的系数就更大。由于橡套游离硫的扩散,改变了秋兰姆橡胶的结构,可能形成多硫键。这些多硫化合物通过化学分解和化合实现迁移,即'化学扩散'。由于迁移的结果,不仅可改变绝缘橡皮的结构,降低其耐热性,而且硫与铜表面反应,形成硫化铜和硫化亚铜,导致铜线发黑。反过来,硫化铜和硫化亚铜加速橡胶的老化,又导致发粘现象的发生。

    JIAGONGGONGYIFANGMIANDEYUANYIN

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    总之,解决橡套电缆铜丝发黑的问题,难度仍然较大,从铜丝到橡皮的每一道工序都要认真对待,才能取得较好的效果。胶种选择和硫化体系的采用仍是问题的关键所在。这个问题的解决需要经历时间的考验。

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点击次数:  更新时间:2019-07-09  【打印此页】  【关闭
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