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淨化板在存放的过程中变黄，是什么原因造成的呢？

作者：潘先生閱讀量：发布日期： 2023/1/29 10:12:37

信息摘要：

有些客戶反饋淨化板在存放的過程中變黃了，這是什麽原因造成的呢？我們一起來了解一下：

一、異型材變色。

熱、氧、光老化變色的主要表現形式是型材，生産過程中出現以下情況：

1、淨化板加热变形后，型材变黄。

2、顔色不統一的型材加工。型材在正常生産過程中不會變黃，但後來成窗産品會變黃。

3、加熱後狀態良好，但型材制成門窗後不久就會變灰。型材在正常生産過程中不會變黃，但後來成窗産品會變黃。

二、分子結構與色彩的關系。

1、淨化板在热和光的作用下有一定量的低分子量，降低了聚合物的热稳定性。

2、除溫度外，還有應力。塑料在成型前，在高攪拌、冷攪拌和擠壓過程中，由剪切應力和拉伸應力引起熱降解。

室外雨水和强阳光照射后，淨化板的型材局部表面发生变色。有些窗户有一个型材。剩余雨点的颜色变化更严重，表面颜色为浅灰色或浅灰色。

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