多异氰酸酯交联聚乙烯醇木材黏合剂的研究

Study on polyisocyanate crosslinked polyvinyl alcohol wood adhesive

以聚乙烯醇溶液为基质,采用正交试验法(控制五水平六因素),探究非离子表面活性剂OP-10、催化剂辛酸亚锡、交联剂JQ-4的加入量、反应时间、反应温度和聚乙烯醇的相对体积的质量对改性聚乙烯醇木材黏合剂剪切强度的影响。研究结果表明:(1)正交试验所选的6个因素对胶粘剂的剪切强度都有影响,其中聚乙烯醇溶液的相对体积的质量影响最大。根据极差分析,影响胶粘剂固化因素的顺序为:PVA溶液相对体积的质量>OP-10加入量>JQ-4加入量>辛酸亚锡加入量>反应时间>反应温度。(2)黏合剂样品大体呈现均一的乳白色,所有样品颜色稳定性良好。黏合剂的稳定性好,不易变质,耐冻,易存储,流动性总体来说较优。(3)样品黏合剂的相对最佳合成条件:PVA加入量为8 g/100 mL,OP-10加入量为0.1 mL/100 mL,JQ-4加入量为0.3 mL/100 mL,催化剂加入量为0.3 mL/100 mL,反应时间为75 min,反应温度为60℃。所制备的乳液为稳定的乳白色,性能优异,可作为胶粘剂用于建筑行业,且更为环保。

The orthogonal experimental method(controlling five levels and six factors)was used to investigate the effect of the addition amount of nonionic surfactant OP-10,catalyst stannous octanoate,crosslinking agent JQ-4,the reaction time,the reaction temperature and the mass of relative volume of polyvinyl alcohol on the shear strength of modified polyvinyl alcohol wood adhesive by using polyvinyl alcohol solution as the matrix.The research results showed that,(1)All six factors selected in the orthogonal experiment had an effect on the shear strength of the adhesive,with the mass of relative volume of polyvinyl alcohol solution having the greatest effect.According to the range analysis,the order of factors affecting the adhesive curing was as follows:mass of relative volume of PVA solution>OP−10 addition>JQ−4 addition>stannous octanoate addition>reaction time>reaction temperature.(2)The adhesive sample generally showed a homogeneous milky white color,and the color stability of all samples was good.The adhesive had good stability,was not easy to deteriorate,freeze-resistant,easy to store,and the fluidity was generally superior(.3)The relative optimal synthesis conditions for the adhesive sample were:PVA addition of 8 g/100 mL,OP−10 addition of 0.1 mL/100 mL,JQ−4 addition of 0.3 mL/100 mL,catalyst addition of 0.3 mL/100 mL,reaction time of 75 minutes,and reaction temperature of 60℃.The prepared emulsion was stable milky white with excellent performance.It could be used as adhesive in the construction industry and was more environmentally friendly.