| PVC--U型材国家标准中耐候性检测方法的探讨 |
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| 引用本文： | 周洪荣,黄勇,李秀文.PVC--U型材国家标准中耐候性检测方法的探讨[J].聚氯乙烯,2012,40(3):28-30. |
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| 作者姓名： | 周洪荣 黄勇 李秀文 |
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| 作者单位： | 1. 大连实德集团技术研发服务中心,辽宁大连,116318
2. 宁夏大元股份有限公司大连分公司,辽宁大连,116113 |
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| 摘 要： | 按照GB／T8814--2004《门、窗用未增塑聚氯乙烯（PVC—U）型材》进行了4000h老化试验，考察了样品△E＊、△b＊和光泽度的变化。结果表明：①所有样品在2000h时都出现了变色峰值，而且峰值都超过GB／T8814--2004的规定，但到4000h时样品的变色情况反而达标；②PVC型材表面颜色的变化不仅是PVC老化的结果，同时也是其表面粉化的结果；③GB／T8814--2004对PVC型材耐候性的检测方法存在不足，应适当地对样品的老化过程进行跟踪和评估。
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| 关 键 词： | PVC型材 耐候性 粉化 标准 检测 |
Discussion on the weather resistance testing method in national standard of PVC-U tubes |
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| ZHOU Hongrong,HUANG Yong,LI Xiuwen.Discussion on the weather resistance testing method in national standard of PVC-U tubes[J].Polyvinyl Chloride,2012,40(3):28-30. |
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| Authors: | ZHOU Hongrong HUANG Yong LI Xiuwen |
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| Affiliation: | 1(1.Technical Development and Service Center,Dalian Shide Group,Dalian 116318,China; 2.Dalian Branch,Ningxia Dayuan Co.,Ltd.,Dalian 116113,China) |
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| Abstract: | Ageing test of 4 000 h are carried out according to GB/T 8814-2004 Unplasticized Polyvinyl Chloride(PVC-U) Profiles for the Fabrication of Doors and Windows to investigate samples’ changes in ΔE*,Δb* and glossiness.The results show that(1) discoloration of all the samples appears peak value at 2 000 h and all the peak value exceed the specified value in GB/T 8814-2004,but the discoloration of all the samples at 4 000 h reaches to the standard;(2) not only PVC’s ageing but also its surface chalking contributes to change in surface color of PVC profiles;(3) there are shortcomings in the test method of weather resistance of PVC profiles in GB/T 8814-2004,and thus the samples’ ageing process should be tracked and evaluated appropriately. |
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| Keywords: | PVC profile weather resistance chalking standard test |
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