淀粉/单体比例及酸解条件对高淀粉含量木材胶性能的影响

Effects of Starch/VAc Monomerratio and Acidolysis Condition on Wood Adhesive Contains Large Amounts of Starch

DOI：10.3969/j.issn.1673-1689.2014.04.013

中文关键词: 淀粉 醋酸乙烯酯 酸解 剪切强度 接枝共聚

英文关键词: starch, vinyl acetate, acidolysis, shear strength, graft copolymerization

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中文摘要:

研究了淀粉与单体质量比对淀粉木材胶粘结性能、接枝参数、贮藏稳定性的影响。结果表明：当淀粉/单体质量比为7∶3时，较常规比例（淀粉/单体质量比为5∶5）下接枝率、接枝效率与干强度分别下降23.8％、21.1％和8.6％，经受冻融循环减少4次，但淀粉用量提高了40％，增加了环保性能。在此基础上，研究了酸解条件对淀粉/单体质量比为7∶3的木材胶性能的影响，综合考虑贮藏稳定性、粘结强度，选择酸解时间为2 h制备高淀粉含量木材胶，并对酸解作用影响淀粉胶性能及接枝共聚反应的机理进行了分析。

英文摘要:

The effects of starch/VAc(vinyl acetate) monomerratio on the shear strength, grafted parameter and storage stability of starch-based wood adhesive were studied. It was shown that, although the graft percentage, graft efficiency and dry shear strength of the starch adhesive produced when the starch/VAc monomerratio is 7∶3, respectively decreased by 23.8%, 21.1% and 8.6％, undergo freeze-thaw cycle four times less when compared with the conventional proportional (starch/VAc monomerratio is 5∶5), the amount of starch was increased by 40% which significantly improved the environmental performance, so the starch/VAc monomerratio was selected as 7∶3. And then acidolysis condition on the characteristics of wood adhesive contains large amounts of starch were studied. Comprehensive study of storage stability and bond strength, select acid hydrolysis time was 2 h. Then on this basis, the wood adhesive contains large amounts of starch was prepared. The action mechanism of acidolysis on characteristics of starch adhesive and graft copolymerization reaction was analyzed.

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