改性脲醛树脂胶粘剂合成的研究

Study on Synthesis of Modified Urea-formaldehyde Resin Adhesive

研究了聚乙烯醇改性脲醛树脂胶粘剂的制备工艺和配方。实验得出：添加适量聚乙烯醇改性剂，甲醛和尿素的最佳物质的量的比为1．5：1，尿素分3次投料，反应温度控制在100℃左右，反应时问60min，可制得综合性能较好的低毒耐水脲醛树脂胶粘剂。产品质量稳定，固含量〉55％，粘度=120～150s，产品质量达到国家规定的指标。

The paper studies the preparation of urea - formaldehyde resin adhesive modified by polyvinyl alcohol （PVA）. The experiments turn out： adding appropriate PVA modifiers, the molar ratio of formaldehyde to urea 1. 5 ： 1, adding urea in three portions, reaction temperature 100 ℃, reaction time 60 min. The low - toxic, water - resisting urea - formaldehyde resin adhesive with good comprehensive performances was obtained. The solid content of the product is more than 55 %, and the viscosity is from 120 s to 150 s, the quality follows the criterion regulated by the nation.