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摘要
随着《建筑和市政工程防水通用规范》的颁布,防水材料耐久年限获得了越来越多的而关注。作为广泛外露应用于屋面的热塑性聚烯烃(TPO)防水卷材,其耐久性研究是业内关注的热点。通过有温度梯度的热氧老化,对两种典型TPO防水卷材进行了长期的耐久性研究,利用宏观和微观表征手段,多角度分析材料老化后性能的变化,获得了TPO防水卷材的关键性能劣化规律。根据失效标准,增强型TPO在135℃下热老化63周后出现功能失效情况;均质型TPO截至70周功能未失效,但力学性能劣化严重。因此,对于存在严苛应力条件的服役环境,应当评估卷材的可靠性。同时,两种型号TPO均出现了一定程度的黄变现象,所以对于外观有要求的建筑,需要考量黄变程度是否可以接受。
Abstract
With the promulgation of the “General Code for Waterproofing of Buildings and Municipal Engineering”,the durability of waterproof materials has attracted more and more attention.As a thermoplastic polyolefin (TPO) waterproof sheet widely used in roofing,its durability research is a hot topic in the industry.Through thermal-oxygen aging with temperature gradient,long-term durability research was conducted on two typical TPO waterproof sheets.Macroscopic and microscopic characterization methods were used to analyze the performance changes of the materials after aging from multiple angles,and the key performance deterioration law of TPO waterproof sheets was obtained.According to the failure criteria,enhanced TPO exhibited functional failure after 63 weeks of thermal aging at 135℃.Homogeneous TPO had no functional failure up to 70 weeks,but its mechanical properties deteriorated seriously.The reliability of the coil material should be evaluated for service environments under severe stress conditions.Additionally,both types of TPO exhibited a certain degree of yellowing.For buildings with strict appearance requirements,it is necessary to consider whether the degree of yellowing is acceptable.
关键词
耐久性
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热塑性聚烯烃
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防水卷材
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热氧老化
Key words
durability
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thermoplastic polyolefin
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waterproofing sheets
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thermal-oxygen aging
基于热氧老化的热塑性聚烯烃防水卷材的耐久性研究[J].
化工新型材料, 2025, 53(6): 247-252 DOI:10.19817/j.cnki.issn1006-3536.2025.06.021
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基金资助
国家重点研发计划子课题(2022YFC3800903-04)
