老化处理对稻壳-木刨花外包装箱板内结合强度及热稳定性的影响

解俊英　肖生苓

摘 要：为研究不同老化条件对稻壳-木刨花外包装箱板内结合强度和热稳定性的影响，分别采用WCAMA六循环老化法和紫外老化法，对两种老化后试件的内结合强度进行测试和热重分析。结果表明：经历WCAMA六循环老化，稻壳-木刨花外包装箱板内结合强度保留率仅剩45.9%，老化使得木刨花中纤维素、半纤维素和木质素被大量分解，失重率为63.04%，酚醛树脂全部水解，异氰酸酯部分水解;而经历1 500 h紫外老化，稻壳-木刨花外包装箱板的内结合强度保留率为87.46%，木刨花中的纤维素、半纤维素和木质素部分分解，失重率为49.19%，只有小部分酚醛树脂发生光化降解，异氰酸酯几乎未受到影响。从而得到，不同的老化处理方式对稻壳-木刨花外包装箱板内结合强度和热稳定性都有影响，但WCAMA六循环老化法影响更大。

关键词：WCAMA六循环老化;紫外老化;稻壳-木刨花复合板;外包装箱板;内结合强度;热稳定性

中图分类号：TS653 文献标识码：A   文章编号：1006-8023（2019）04-0043-08

Effect of Aging Treatment on IB and Thermal Stability

of Rice Husk-Wood Shaving Box

XIE Junying， XIAO Shengling*

（College of Engineering and Technology， Northeast Forestry University， Harbin 150040）

Abstract：In order to study the effects of different aging conditions on the bond strength and thermal stability of the rice husk-wood shaving box， the internal bond strength of the two aging specimens was tested and thermogravimetric analyzed using WCAMA six-cycle aging method and UV aging method， respectively. The results showed： After WCAMA six-cycle aging， the internal binding strength retention rate of the husk-wood shavings outside the box is only 45.9%. The aging caused the cellulose， hemicellulose and lignin in wood shavings to be decomposed in a large amount， the weight loss rate is 63.04%， the phenolic resin is completely hydrolyzed， and the isocyanate is partially hydrolyzed. After 1 500 h UV aging， the internal bond strength retention rate of the rice husk-wood shaving box is 87.46%. The cellulose， hemicellulose and lignin in the wood shavings are partially decomposed， and the weight loss rate is 49.19%. Only a small part of the phenolic resin is photochemically changed. Isocyanate is almost unaffected. Conclusion： different aging treatment methods have an effect on the bonding strength and thermal stability of the rice husk-wood shaving box， but the WCAMA six-cycle aging method have a greater influence.

Keywords：WCAMA six cycle aging; ultraviolet aging; rice husk-wood shavings composite board; outer box board; IB; thermal stability

0 引言

隨着物流的不断发展，木质包装材料作为一种环境协调性材料，具有绿色包装材料的特点，受到人们越来越多的重视。我国是少林国家，木材供需矛盾尖锐。以废弃农林生物质资源制备包装材料具有广阔发展前景[1-2]。外包装箱用复合板常用于室外，会受到各种不利因素的影响，如紫外线照射、温湿度变化和盐雾侵蚀等，这些因素会使复合板的力学性能降低，缩短外包装箱的使用寿命，因此复合板应具有良好的耐老化性能[3-4]。……