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聚氯乙烯胶泥是属于高分子防水材料,都有老化的趋势。胶泥老化是指它在屋面防水工程上,承受着阳光紫外线、热、氧、水、臭气和机械作用后,其分子结构中的长链逐渐断裂,形成活泼的游离基,造成其它分子链进一步断裂以及增塑剂、煤焦油的挥发,从而使胶泥出现老化膜,延伸率降低等老化现象。太原钢铁厂初轧厂钢坯库屋面应用胶泥防水,经过十八年的自然老化,胶泥延伸率只降低9％;老化膜厚度为3毫米,早期老化速度快,后期老化速度愈来愈慢,平均老化速度为
Polyvinyl chloride cement is a polymer waterproof material, have the aging trend. Mastic aging refers to its roof waterproofing works, under the sun’s ultraviolet rays, heat, oxygen, water, odor and mechanical effects, the long chain in the molecular structure of the gradual fracture, the formation of lively free radicals, causing other molecular chains further Fracture and plasticizer, the volatilization of coal tar, so that aging mortar appear film, elongation and other aging phenomena. After the eighteen years of natural aging, the elongation of the clay decreased by only 9%. The thickness of the aging film was 3 mm. The early aging rate was faster and the aging rate was slower at the later stage. The average The aging speed is