3种植物蛋白粕基胶粘剂的性能分析

Performance Analysis of Three Vegetable Proteins Meal-based Adhesives

采用十二烷基硫酸钠(SDS)、纳米SiO_(2)(nSiO_(2))和聚酰胺多胺环氧氯丙烷树脂(PAE)为改性剂,制备胶接性能优良的高温花生粕蛋白胶粘剂(HPMA)、棉籽粕蛋白胶粘剂(CMA)及大豆粕蛋白胶粘剂(SMA),并对胶粘剂的胶合强度、物化性能及结构变化进行分析。结果表明,HPMA、CMA、SMA制备的杨木胶合板湿态沸水胶合强度分别达到0.98、1.18、1.07 MPa,均达到国家Ⅰ类杨木胶合板标准。傅里叶红外光谱显示出3种植物蛋白胶粘剂-COOH、C-N和N-H键特征峰明显减少,PAE与3种植物蛋白分子生成交联网络。扫描电镜图谱和接触角分析印证了改性剂发生超支化交联,形成致密的三维网络结构。

Sodium dodecyl sulfate(SDS),nano-SiO_(2)(nSiO_(2))and polyamide polyamine epichlorohydrin resin(PAE)were used as modifiers,successfully prepared high temperature peanut meal protein adhesive(HPMA),cottonseed meal protein adhesive(CMA)and soybean meal protein adhesive(SMA)with excellent bonding properties,and analyzed the adhesive strength,physicochemical properties and structural changes of the adhesives.The research indicated that the boiling water wet bonding strengths of poplar plywood prepared by HPMA,CMA and SMA reached 0.98 MPa,1.18 MPa,and 1.07 MPa,respectively,all meeting the national classⅠstandard for poplar plywood.Fourier transform infrared spectroscopy showed that the characteristic peaks of the three plant protein adhesives-COOH,C-N and N-H bonds were significantly reduced,and the PAE and the three plant protein molecules formed a cross-linked network.Scanning electron microscopy and contact angle analysis confirmed that the modifier was hyperbranched and crosslinked,which formed a dense three-dimensional network structure.