Basic research on new evalution method of durability of wood adhesive for structural use.

结构用木材胶粘剂耐久性评价新方法的基础研究

基本信息

批准号：
60302082
负责人：
MIZUMACHI Hiroshi
金额：
$ 4.93万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

项目摘要

We have promoted multilateral and general research concerning durability of wood adhesive for structural use, involving Japanese leading wood adhesive scientists. We report here the results of three-year research as follows.Group A took charge of molecular design and synthesis of adhesive and analysis of its chemical property. They made a basic study on utilization of lignin, tannin, and organic solvent soluble wood for adhesive materials in addition to phenol or urea resins, and indicated the possibility of developing useful adhesive for stuctural use by controlling the reaction process in synthesizing adhesive and chemical properties of cured materials.Group B took charge of mechanical properties of materials, and evaluated the adhesive properties after detailed characterization of structure and mechanical properties for various adhesives. It turned out that the rheological feature of strength or adhesive durability became apparent. In the analysis of fracture mechanism for bonded materials, basic data on the relation between fracture toughness and adhesive properties were accumulated.Group C evaluated the durability of wood-based material and adhesive through repeated load test, repeated moisture test, and various exposure tests which were similar to condition for practical usage.Adhesion is a complicated phenomenon depending on large number of factors. In order to clarify its mechanism, the approach from various aspects, such as chemistry, physical chemistry, rheology, fracture mechanics, polymeric material science, and wood technology, and putting them together are considered essential. In this research, the durability of adhesive which is most important in the field of wood industry was evaluated through the above method and significant result was given. This result will be a powerful footing in order to establish both scientific and universal evaluation method of adhesive durability.

我们推动了有关结构用木材粘合剂耐久性的多边和一般性研究，其中包括日本领先的木材粘合剂科学家。现将历时三年的研究成果报告如下：A组负责粘合剂的分子设计、合成及化学性能分析。他们对除了酚醛树脂或脲醛树脂以外，还利用木质素、单宁和有机溶剂可溶性木材作为粘合剂材料进行了基础研究，并指出了通过控制合成粘合剂的反应过程和化学性质来开发用于结构用途的有用粘合剂的可能性B组负责材料的力学性能，对各种粘合剂的结构和力学性能进行详细表征后，评估其粘合性能。事实证明，强度或粘合耐久性的流变特征变得明显。在对粘合材料断裂机理的分析中，积累了断裂韧性与粘合性能关系的基础数据。C组通过反复载荷试验、反复潮湿试验、各种曝晒试验，评价人造板材料及粘合剂的耐久性。与实际使用条件相似。粘附是一个复杂的现象，取决于许多因素。为了阐明其机理，需要从化学、物理化学、流变学、断裂力学、高分子材料科学和木材技术等多个方面进行研究，并将它们综合起来。本研究通过上述方法对木材工业领域最重要的粘合剂的耐久性进行了评估，并得到了显着的结果。这一结果将为建立科学、通用的胶粘耐久性评价方法奠定坚实的基础。