复合变性淀粉制备淀粉基异氰酸酯胶黏剂的研究

Study on Preparation of Starch-based Polyisocyanate Adhesives Using Composite-modified Starch

研究了复合变性玉米淀粉制备Ⅰ、Ⅱ型淀粉基水性高分子-异氰酸酯(API)胶黏剂的工艺。选择复合变性淀粉乳液、二元酸、聚乙烯醇、多异氰酸酯的用量作为影响因素,以压缩、拉伸剪切强度为评价目标,通过正交试验优化出满足日本JISK 6806-1995指标要求的Ⅰ、Ⅱ型淀粉基API胶黏剂的配方,对影响胶黏剂理化性能的因素进行了系统分析。验证实验证明,所优化出的最佳配方具有明显的生产可操作性,交联剂多异氰酸酯可不经封闭直接使用,完全能够满足现有的木材胶合制品生产工艺的要求。

Preparations of Ⅰ, Ⅱ types starch-based aqueous polyisocyanate （API） adhesives using composite-modified corn starch are systemically studied. Using dosages of composite-modified starch emulsion, oxalic acid, polyvinyl alcohol（ PVA）, and polymeric MDI （PMDI） as main influencing factors, compressive, tensile and shearing strengths as evaluation target, formulation of Ⅰ type starch-based API which meets index requirement of JISK 6806 - 1995 is optimized by orthogonal test and factors affecting physical and chemical properties of adhesive are analyzed systemically. Testified by validating test, the best optimized formulation has obvious operability of production. Cross-linking agent PMDI can be directly used without sealing, which meets completely the requirement for manufacture process of glued wood products.