固化剂对MUF树脂基马尾松阻燃胶合板性能影响研究

Effects of curing agent on properties of MUF resin-based flame retardant plywood of masson pine

以马尾松阻燃单板和三聚氰胺改性脲醛(MUF)树脂制备胶合板,研究了不同固化剂对胶合板胶合性能、固化性能和热性能的影响。研究结果表明:相较传统固化剂氯化铵,过氧化氢、氯化铝和甲酸都能有效地促进MUF树脂的固化,并均能提高胶合板的胶合强度,但木破率有所降低,其中过氧化氢作为MUF固化剂综合性能相对最好;相较氯化铵,氯化铝和甲酸作为固化剂会降低MUF树脂的热稳定性,而过氧化氢则能提高MUF树脂的热稳定性;过氧化氢、氯化铝和甲酸催化固化的MUF树脂胶层断面都存在大量的空隙,树脂的耐久性将受到影响;固化剂通过产生氢离子降低树脂体系的p H来促进MUF树脂的固化,但存在一定的局限性。

The plywood was prepared from flame retardant veneer of masson pine and melamine modified urea formaldehyde(MUF) resin,and the effects of curing agent on plywood bonding performance,curing characteristics and thermal properties were studied.The research results showed that,compared with the traditional curing agent ammonium chloride,hydrogen peroxide,aluminum chloride and formic acid could effectively promote the curing of MUF resin and improve the bonding strength of ply wood,but the wood failure percentage was reduced.Among them,hydrogen peroxide had the relatively best comprehensive performance as MUF curing agent.Compared with ammonium chloride,aluminum chloride and formic acid as curing agents could reduce the thermal stability of MUF resin,while hydrogen peroxide could improve the thermal stability of MUF resin.There were a lot of gaps in the cross-section of MUF resin cured by hydrogen peroxide,aluminum chloride and formic acid,and the durability of resin would be affected.The curing agent could promote the curing of MUF resin by producing hydrogen ions and then reducing the pH of resin system,but there exist certain limitations.