Water proofness of urea-forrualdehyde resin can be improved by adding melamine and polyvinyl alcohol. The free formaldehyde content in the modified resin lowered obviously.

• 采用加入聚乙烯醇及三聚氰胺等方法来改善脲醛树脂胶粘剂的耐水性,制得的树脂游离醛含量明显下降。