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抗靜電劑與增電劑摩擦帶電劑對粉末涂料什么意義?

文章出處:本站 瀏覽次數:765發表時間:2022-06-28

抗靜電劑與增電劑摩擦帶電劑對粉末涂料什么意義?

在粉末涂料配方中,抗靜電劑的作用是利用表面活性劑的特性,吸附空氣中的水分,使表面活性劑產生極化,形成極薄的導電層,產生靜電泄漏通道的助劑。廣泛應用的抗靜電劑是表面活性劑,通過不同方法泄漏電荷或降低摩擦系數,從而抑制靜電電荷的產生,降低粉末涂料成膜物表面的電阻,加快靜電荷的泄漏。在典型的抗靜電劑表面活性劑分子中,兩個端基中的一端帶親水基,另外一端帶親油基,并且具有適當的親水親油值。在抗靜電劑分子結構中,親水基和親油基的適當匹配對抗靜電效果有很大的影響。

粉末涂料

抗靜電劑的分類可按化學結構來分,一般可分為陽離子型。陰離子型、非離子型和兩性型,常用的抗靜電劑是這四種化合物或者是復合物。在粉末涂料配方中,增電劑的作用是能夠有效地提高靜電粉末涂料噴漆時粉末粒子的帶電量,從而提高一次上墳綠;同時在噴粉時工作表面的電荷及時泄漏掉,克服靜電屏蔽效應,使棱角和凹部分易于上粉。在粉末涂料配方中,摩擦帶電劑是在摩擦靜電粉末噴涂時,改進粉末涂料的摩擦靜電性能,增加粉末涂料的和電量,提高粉末涂料的上粉率從而添加的助劑。


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