高温致活工业明胶木材胶黏剂的制备及应用  

Preparation and application of a high temperature activated industrial gelatin wood adhesive

作　　者：王学川 王利红 张思肖 刘新华 蓝晓梅 WANG Xuechuan;WANG Lihong;ZHANG Sixiao;LIU Xinhua;LAN Xiaomei(College of Bioresources Chemical and Materials Engineering,Shaanxi University of Science&Technology,Xi'an 710021,Shaanxi,China;Key Laboratory of Leather Cleaner Production China National Light Indus try,Xi'an 710021,Shaanxi,China)

机构地区：[1]陕西科技大学轻工科学与工程学院,陕西西安710021 [2]中国轻工业皮革清洁生产重点实验室,陕西西安710021

出　　处：《精细化工》2020年第3期622-628,共7页Fine Chemicals

基　　金：国家自然基金项目(21776169)。

摘　　要：以废弃皮革中提取的工业明胶为原料,甲乙酮肟制备的封闭型水性聚氨酯为交联剂,通过在高温热压条件下解封出活性异氰酸酯基团,使其与明胶产生交联,合成出高温致活封闭型工业明胶木材胶黏剂。FTIR和DSC结果表明,甲乙酮肟分子上的羟基与聚氨酯预聚体上的异氰酸酯基团发生缩聚反应,其最大解封温度约126℃。SEM结果显示,胶黏剂经高温固化后表面更为光滑,说明明胶与封闭型水性聚氨酯组分间的相容性得到了提高。应用测试结果表明,当封闭型水性聚氨酯占明胶水溶液质量的20%时,胶黏剂的湿剪切强度高达0.97MPa,满足国家Ⅱ类胶合板的使用要求,且最佳的热压工艺条件是热压温度150℃、热压时间4min、涂胶量300 g/m2。A high temperature activated industrial gelatin wood adhesive was synthesized via a reaction between industrial gelatin and isocynate groups released from blocked waterborne polyurethane under high temperature and hot-pressing conditions.Wherein,the industrial gelatin was extracted from waste leather and the blocked waterborne polyurethane was prepared using methyl ethyl ketoxime as blocking agent.FTIR and DSC results showed that the hydroxyl group on the methyl ethyl ketone oxime molecule and the isocyanate group on the polyurethane prepolymer underwent condensation polymerization,and the maximum unblocking temperature was about 126℃.SEM results revealed that the surface of adhesive was smoother after curing at high temperature,indicating that the compatibility between gelatin and blocked waterborne polyurethane component was improved.The application test results demonstrated that the wet shear strength of adhesive was up to 0.97 MPa when the content of the blocked waterborne polyurethane was 20%based on the mass of gelatin aqueous solution,which met the national requirements of ClassⅡplywood.The optimum hot-pressing process conditions were obtained as follows:hot-pressing temperature 150℃,hot pressing time 4 min,amount of glue spread 300 g/m2.

关 键 词：工业明胶 封闭型水性聚氨酯 木材胶黏剂 剪切强度 

分 类 号：TQ431.4[化学工程]