封闭异氰酸酯改性脲醛树脂制备胶合板

摘要

采用亚硫酸氢钠封闭异氰酸酯改性UF树脂制备胶合板,研究了制板用混合胶液的比例、热压时间、热压温度等热压工艺对胶合板性能的影响,结果表明,在UF/PAPI=100/10、热压温度为110℃、热压时间为4min时,所制备胶合板的甲醛释放量达到国家标准,并且具有较高的胶合性能.%The plywood was prepared using the UF resin modified with isocyanate blocked by sodium bisul-fate as adhesive. And the effects of the ratio of UF resin to isocyanate, hot press temperature, hot pre ss timeon the properties of the plywood were also studied. The results showed that under the conditions of UF/PAPI =100/10, hot press temperature of 110℃and hot press time of 4min, the bonding strength of the plywood was improved obviously and the formaldehyde release from the plywood could meet the requirements specified in national standard.