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影响彩涂卷老化的原因及解决

发布者:唐山天物彩板有限    发布时间:2019-09-27 08:40
平顶山彩涂卷防止老化的原因_平顶山彩涂卷现价
影响彩涂卷老化的原因及解决

如果彩涂卷使用时间过长或不长,可能会老化。为什么我们说长期的施工或储存会暴露在阳光下?通过长期的光照,衰老是不可避免的,但我们通常可以更早地预防和降低衰老的速度,那我们该怎么办呢?
 
彩涂卷老化或光化学反应的第一个必要条件是彩涂卷的外部组分能够吸收辐射能;第二,当分子吸收的辐射能大于分子键吸收的辐射能时,彩涂卷可以降低。因为光的波长越短,它所包含的能量就越高。
 
根据上述理论,彩涂卷在大气环境中的老化是涂层分子吸收紫外波段能量高于其在阳光下的分子键能,从而导致涂层分子的降解。随着涂层的老化,基体逐渐丧失,涂层表面逐渐变得粗糙光滑。这种基材的流失最终会留下相对稳定的颜料颗粒,这些颜料颗粒以无粘结粉末的形式留在涂层表面,这一过程被称为粉碎。
 
综上所述,不同涂层厚度的聚酯彩涂卷的耐老化性能存在较大差异。彩涂卷的耐老化性能较差,普通彩涂卷的耐老化性能较好。因此,依靠减薄涂层来降低彩涂卷的生产成本是不可行的,这必然会带来严重的质量问题。同时也证明了在彩涂卷国外进口商订货合同中明确规定涂层厚度的必要性。
If the color coatings are used for too long or not for a long time, they may be aged. Why do we say that long-term construction or storage will be exposed to the sun? It is inevitable that aging will occur through the long-term illumination of light, but we can usually prevent and reduce the speed of aging earlier, so what should we do?
 
The first necessary condition for the aging or photochemical reaction of the coated plate is that the external components of the coated plate can absorb radiation energy; secondly, when the radiation energy absorbed by molecules is greater than that absorbed by molecular bonds, the coated plate can degrade. Because the shorter the wavelength of light, the higher the energy it contains.
 
According to the above theory, the aging of coated sheets in atmospheric environment is that the coated molecules absorb the energy of ultraviolet light band higher than their molecular bond energy in sunlight, which leads to the degradation of coated molecules. With the aging of the coating, the substrate body gradually loses, and the coating surface gradually becomes rough and glossy. This loss of the base material eventually leaves relatively stable pigment particles, which remain on the surface of the coating in the form of unbonded powders, a process known as pulverization.
 
In conclusion, the aging resistance of polyester color coated sheets with different coating thickness is quite different. The aging resistance of thin coated color coated sheets is poor, and that of normal coated sheets is relatively good. Therefore, relying on thinning coating to reduce the production cost of color coated sheet is not feasible, which will inevitably bring serious quality problems. Together, it proves the necessity of clearly specifying the thickness of coating in the order contract of foreign importers of color coated sheet.
 

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