摘要
用二次回归正交试验设计法研究由碱、脲等组成的复合豆粕变性剂对大豆球蛋白变性效果的影响；采用低液比、高强度变性和均质处理分段进行的工艺技术，研究液比、尿素、烧碱、邻苯二酚等4个关键因素对低温豆粕中大豆球蛋白解聚作用的影响；着重考察大豆基木材胶粘剂黏度指标。分析结果，碱在复合型大豆球蛋白变性剂中是最有效和最关键的变性剂；尿素对大豆球蛋白的变性作用较碱弱；液比通过影响变性剂的浓度显著影响变性剂特别是尿素对蛋白的变性效果；邻苯二酚对豆胶黏度的影响很小。研究表明，采用低液比、高强度的大豆球蛋白变性方法，碱和尿素的用量比现有方法减少1倍以上，而对大豆球蛋白的解聚能力却明显提高；在复合的变性剂中，碱与豆粕干物的重量比为0．0271～0．0300，尿素与豆粕干物的重量比为0．02～0．12时，部分处理中豆胶黏度高达902～1973Pa·s以上，大大高于豆胶用于木材粘接时所要求的〉50Pa·s的初黏度指标。采用这种复合变性法制备的大豆基木材胶粘剂达到Ⅱ类（耐热水）胶的标准。
Quadratic regression orthogonal experimental design was adapted to investigate the effects of liquor ratio, urea, sodium hydrate, and catechol on the soy globulin unfolding degree which was represent by the viscosity of soy based wood adhesives. The experiment results indicated that alkali was the first important factor of this complex denaturant whereas the effectiveness of urea, especially when it was diluted, was weak. The viscosity as high as 902- 1973Pa·s, which far exceeded the common request of 〉50Pa＇s for soy adhesive used for wood bonding adhesive can be produced when the dosage of urea, sodium hydrate was reduced to half of it in the conventional soy globulin denaturants, due to the low liquor ratio was adapted to the denaturing process. The soy based wood adhesive produced by this complex denaturant can met the standard of hot water resistant type.
出处
《林业科技》
北大核心
2006年第4期48-51,共4页
Forestry Science & Technology
基金
科技部农业科技成果基金转化项目(03EFN217200343):"黄化陈米
稻秆麦秆等生物质转化无甲醛木材胶黏剂中试"
关键词
液比
尿素
烧碱
邻苯二酚
豆胶黏度
Liquor ratio
Urea
Sodium hydrate
Catechol
Viscosity of soy based adhesive
