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为了降低豆基蛋白质胶粘剂的黏度、提高胶合板的耐沸水胶接强度和满足工业化的生产要求,对传统豆基蛋白质胶粘剂进行改性,并通过胶粘剂的黏度、pH值、凝胶时间、耐沸水胶接强度以及热分析结果等确定了改性剂的合理用量。然后以热压温度、热压时间、热压压力和涂胶量作为试验因素,以胶接强度作为考核指标,采用正交试验法优选出制备胶合板用改性豆基蛋白质胶粘剂的较佳工艺条件。结果表明:改性剂的合理用量(质量分数)是40%;胶合板的较佳热压工艺参数是热压温度140℃,热压时间5 min,热压压力1.2 MPa,双面涂胶量310 g/m2;在此较佳热压工艺条件下制备的胶合板,其耐沸水胶接强度较理想(为1.12 MPa),并且满足Ⅰ类胶合板的标准要求。
In order to reduce the viscosity of soya-based protein adhesive, improve the bonding strength of plywood against boiling water and meet the requirements of industrialized production, the traditional soybean-based protein adhesive is modified and its viscosity, pH, gel time, Then strength and thermal analysis results to determine the reasonable dosage of modifier. Then the hot pressing temperature, hot pressing time, hot pressing pressure and the amount of glue as a test factor, the adhesive strength as an assessment index, using orthogonal test method to optimize the preparation of plywood with modified soy protein binder better process conditions . The results show that the proper dosage of modifier is 40%. The optimal hot pressing parameters of plywood are hot pressing temperature 140 ℃, hot pressing time 5 min, hot pressing pressure 1.2 MPa, double - sided coating amount 310 g / m2. The plywood prepared under the better hot-pressing conditions has better resistance to boiling water bonding (1.12 MPa) and meets the standard requirements of class I plywood.