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Estimation of Life-time of Wood-based Materials according to the Physical Properties of Adhesives

根据粘合剂的物理性能估算木质材料的使用寿命

基本信息

批准号：
62470127
负责人：
MIZUMACHI Hiroshi
金额：
$ 0.38万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

A variety of new wood-based materials have recently been industrially developed and they are going to be used in some structural applications, where mechanical durability of the materials is considered to be one of the most important factor. We have tried to compare the physical properties of adhesives and adhesive performances, including the durability of the bonded systems, and to analyse the results rheologically. Results are summarized below;Dynamic mechanical properties of 3 PVAc-based adhesives, a polyester hot melt adhesive, 3 EVAc-based hot melt adhesives and an acrylic foam binder (VHB) are measured at 110Hz. Adhesive shear strength, adhesive tensile strength and peel strength are measured as a function of both temperature and deformation rate. Time-temperature superposition procedures are applied to the experimental data, and master curves are constructed. Adhesive shear strength has a maximum at the highest deformation rate, and the magnitude is high. Adhesive tensile strength has a maximum at slightly lower rate than adhesive shear strength has, and has a lower magnitude. Peel strength has a maximum at the lowest deformation rate. These peaks shift toward higher rate side as the relaxation time is lowered, or vice versa.Our next step is to measure the creep life-time of bonded systems as a function of both temperature and load level, and it is found that the life-time of the bonded materials can be described in a rheological manner. As these kinds of data are accumulated more in future, the theory to predict the life-time of the bonded materials must be refined to a greater extent.

近年来，工业上开发了各种新型木质材料，它们将被用于一些结构应用，其中材料的机械耐久性被认为是最重要的因素之一。我们试图比较粘合剂的物理性能和粘接性能，包括粘接系统的耐久性，并对结果进行流变性分析。研究结果总结如下：在110 Hz下测试了3种PVAc基胶粘剂、1种聚酯热熔胶、3种Evac基热熔胶和1种丙烯酸泡沫塑料粘结剂的动态力学性能。测量了粘接剪切强度、粘接拉伸强度和剥离强度作为温度和变形速率的函数。对实验数据进行了时间-温度叠加处理，并绘制了主曲线。粘结剪切强度在变形速率最大时有最大值，且大小较大。胶粘剂拉伸强度在略低于胶粘剂剪切强度时有一个最大值，并且具有较低的幅度。剥离强度在最低变形速率时有最大值。我们的下一步是测量粘结系统的蠕变寿命作为温度和载荷水平的函数，发现粘结材料的寿命可以用流变学的方式来描述。随着这类数据的积累越来越多，对粘结材料寿命预测的理论也必须有更大的改进。