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class="tiyao">防滲膜的自然老化使人們一直對尋求能夠長期抵抗紫外線和保護HDPE膜的途徑非常感興趣。一般來說，自然老化和其它環境因素引起的材料壽命的變化，都歸結為老化。材料的變化可以通過研究材料的力學性能的變化來判斷。在一定條件下，可以用材料性能的變化來估計材料的壽命。</div> <div class="content"> <div id="_ctl2_nsContentDiv" class="nscontent"><a target="_blank" title="防滲膜" class="keywords" href="/">防滲膜</a>的自然老化使人們一直對尋求能夠長期抵抗紫外線和保護HDPE膜的途徑非常感興趣。一般來說，自然老化和其它環境因素引起的材料壽命的變化，都歸結為老化。材料的變化可以通過研究材料的力學性能的變化來判斷。在一定條件下，可以用材料性能的變化來估計材料的壽命。<br> 防滲膜是用最優質的聚乙烯樹脂制造的。為了防止紫外線引起的老化，在材料中加入含量為2%~3%的粉末狀碳黑。碳黑可以非常有效地抵抗自然老化引起的材料性能衰退達50年以上。高密度聚乙烯在無氧條件下抗紫外光和熱的作用非常穩定。聚乙烯在熱降時解遵循無規斷鏈及分子內和分子間轉移反應的機理，只有在350℃以上的高溫下，才會發生分子鏈斷裂分解，降解產物有乙烯、丙稀、丁烯和分子鏈更長的烯烴碎片。不僅添加劑的質量很重要，而且聚乙烯樹脂本身在抗紫外線方面也起著至關重要的作用。樹脂的許多性能是可以調整的，以提高其抗紫外線的能力?，F在已經證明降低聚乙烯基礎樹脂的密度是會降低樹脂的抗老化和抗化學性能，同時也會降低化學穩定劑和碳黑的效果。<br></div> <div id="nsKey" class="key" style="display:none;">關鍵字：<a href="search.html?sear_key=防滲膜" target="_blank">防滲膜</a> </div> <div id="nsKey1" class="key" >本文網址：<a 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