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在尿素与甲醛的缩合过程中加入聚乙烯醇(简称PVA)进行改性,探讨了胶粘剂中各组分与剪切强度、固化时间的关系及胶的耐水性.“,”In order to modify and inquire into the relationship between each component in adhensives and shearing intensity as well as hardening time,also for water-resistance of glue,we should fill in PVA during condensation process of modified urea and formaldehyde.