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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.

我们促进了有关结构用木材胶粘剂耐久性的多边和一般性研究，其中包括日本领先的木材胶粘剂科学家。本文报告了三年来的研究成果：A组负责胶粘剂的分子设计与合成，并对其化学性能进行了分析。他们对木质素、单宁和有机溶剂可溶性木材除酚树脂或脲醛树脂外的应用作了基础性研究，指出了通过控制合成胶粘剂的反应过程和固化物的化学性能，开发有用的结构用胶粘剂的可能性。B组负责材料的力学性能，并在详细表征各种粘合剂的结构和机械性能后评价粘合性能。结果表明，强度或粘合耐久性的流变学特征变得明显。在粘接材料的断裂机理分析中，积累了断裂韧性与粘接性能关系的基础数据，C组通过与实际使用条件相似的反复载荷试验、反复湿度试验和各种暴露试验，对木基材料和胶粘剂的耐久性进行了评价。为了阐明其机理，必须从化学、物理化学、流变学、断裂力学、高分子材料科学、木材工艺学等多方面入手，并将它们结合起来。本研究采用上述方法对木材工业中最重要的胶粘剂的耐久性进行了评价，得到了有意义的结果。这一结果将为建立科学、通用的胶粘剂耐久性评价方法提供有力的依据。