三聚氰胺-尿素-甲醛共缩聚树脂胶粘剂的研制

通过合成三聚氰胺-尿素-甲醛树脂(MUF)胶粘剂,探讨了三聚氰胺用量对该MUF胶粘剂耐水性和其它性能的影响。结果表明:随着三聚氰胺用量的增加,MUF胶粘剂的耐水性能提高、固含量增大、固化时间和储存期延长,并且胶合板剪切强度增大,但MUF胶粘剂中游离醛含量降低;当w(三聚氰胺)40%时,MUF胶粘剂性能提高并不明显,为了降低成本,选择w(三聚氰胺)=30%～40%时较适宜;三聚氰胺用量不同是影响MUF结构和基团含量的主要因素。

Study on preparing melamine-urea-formaldehyde copolycondensation resin adhesives

The melamine-urea-formaldehyde resin(MUF) adhesive was synthesized,and the influences of melamine contents on the water resistance and other performances of MUF adhesive were also discussed.The results showed that the some performances(such as water resistance,solids content,curing time and storage period) of MUF adhesive and shear strength of plywood were increased,but free formaldehyde content in MUF adhesive was decreased with increasing melamine contents.The performances of MUF adhesive weren’t obviously improved when mass fraction of melamine was above 40%,so the optimal mass fraction of melamine was 30%-40% for cost reduction.The influences of different melamine contents on the structures and group contents of MUF were main factors.