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Application of Liquefaction to Wood-Based Materials Hard to be Abandoned

液化在难废弃木质材料中的应用

基本信息

批准号：
13460072
负责人：
TOMITA Bunichiro
金额：
$ 8.51万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

The Liquefaction of Sugi (Cryptomeria Japonica) was investigated by using polyethylene glycol/glycerol mixture as solvent and sulfuric acid as catalyst. As the results, the wood content in liquefied wood was increased up to appioximately 50%. The liquefied wood was reacted with various epoxy compounds to develop a new resin system. The viscoelastic properties of cured resins were evaluated by the changing the ration of liquefied wood to epoxv compound. The cured resins generally displayed one broad glass transition at 40-70℃, that suggested to form interpenetrating polymer networks. Further, their normal adhesive shear strength was recognized to be the same as commercial epoxy resins.As the wood-based materials hard to be abandoned, the liquefaction of several wood polymer composites (WPC), which contains polystyrene and poly(methyl methacrylate), were investigated by the same method. However, these liquefaction did not proceed well, because the polymer impregnated into wood would hinder the affinity between solvent and wood.As the waste plant materials, the liquefaction of rice flour, rice straw, stem of Solidago altissima and leaves of various trees (Larix leptolepis, Zelkova serrata and Ginkgo biloba) were investigated by using same solvent and catalyst. As the results, rice straw and tree leaves were found generally to resist to the liquefaction. On the other hand, rice flour and stem of Solidago were found to be easy to liquefy. The liquefaction of rice straw was improved by alkaline pre-treatment. The products obtained from rice flour and stem of Solidago also were shown to afford the resins by reacting with various epoxy compounds. These cured resins display almost the same behavior as those from wood in the measurement of temperature dependence of viscoelastic properties.

以聚乙二醇/甘油混合物为溶剂，硫酸为催化剂，对柳杉的液化进行了研究。结果表明，液化木材中的木材含量增加到约50%。将液化木材与各种环氧化合物反应，以开发一种新的树脂体系。通过改变液化木材与环氧树脂的比例，评价了固化树脂的粘弹性能。固化物的玻璃化转变温度在40-70℃之间，呈现一个较宽的范围，表明树脂间形成了互穿网络结构。由于木质材料难以废弃，采用相同的方法研究了几种含聚苯乙烯和聚甲基丙烯酸甲酯的木质聚合物复合材料（WPC）的液化行为。以大米粉、稻草、一枝黄花茎和落叶松、榉树、银杏叶为原料，采用相同的溶剂和催化剂，研究了它们的液化反应。结果表明，稻草和树叶一般都能抵抗液化。另一方面，米粉和一枝黄花茎被发现是容易腐烂的。碱预处理提高了稻草的液化效果。从米粉和一枝黄花茎中得到的产物也显示出与各种环氧化合物反应得到树脂。这些固化树脂显示几乎相同的行为，从木材中的粘弹性性能的温度依赖性的测量。