【摘要】 聚醋酸乙烯酯乳液(PVAc)可以作为脲醛树脂(UF)的改性剂,为探讨聚乙酸乙烯酯乳液对脲醛树脂性能的影响。采用PVAc对脲醛树脂胶黏剂进行改性,同时考虑环境温度、固化剂投加量对改性脲醛树脂的固化时间的影响,并对改性胶在杨木单板表面的润湿性能进行了测试,结果表明该改性剂有助于提高脲醛树脂的固化特性和润湿性能,同时也指出PVAc占脲醛树脂比例为20%、NH4Cl投加量为2%、柠檬酸投加量为5%时的改性脲醛树脂胶黏剂取得最佳效果。更多还原

【Abstract】 Polyvinyl acetate emulsion was used as modifier to investigate its influence on the performance of urea-formaldehyde resin.The influence of ambient temperature and the dosage of curing agent on the curing time was also studied.Wetting performance of the resin was tested in the surface of the poplar veneer.The results showed that the modifier helped to improve the curing and wetting properties of urea-formaldehyde resin.It was concluded that the optimal mass percentage in the adhesive was 20% for polyvinyl acetate emulsion,2% for NH4Cl,and 5% for citric acids.更多还原