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

• 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
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-62470127/
• 关键词: wood adhesion; adhesives; dynamic mechanical properties; durability; adhesive strength; creep; マスターカーブ; ホットメルト; EVA; タッキファイアー; 引張り接着強さ; せん断接着強さ; wood adhesion; adhesives; dynamic mechanical properties; durability; adhesive strength; creep; マスターカーブ; ホットメルト; EVA; タッキファイアー; 引張り接着強さ; せん断接着強さ

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.

最近开发了各种新的木材基材料，它们将用于某些结构应用中，在某些结构应用中，该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和粘合剂性能的物理特性，包括粘合系统的耐用性，并通过流变学分析结果。结果汇总在下面的；在110Hz处测量了3种基于PVAC的粘合剂，一种基于PVAC的粘合剂，一种基于PVAC的粘合剂，一种聚酯热融化粘合剂，3种基于EVAC的基于EVAC的热熔体粘合剂和丙烯酸泡沫粘合剂（VHB）。粘合剪切强度，粘合性拉伸强度和果皮强度是温度和变形速率的函数。时间温度叠加程序应用于实验数据，并构建了主曲线。粘附剪切强度在最高变形速率下具有最大值，并且幅度很高。粘合性拉伸强度的最大速率略低于粘合剪切强度，并且幅度较低。果皮强度的最大变形速率具有最大值。随着放松时间的降低，这些峰向更高的速率侧转移，反之亦然。我们的下一步是测量粘结系统的蠕变寿命，这是温度和负载水平的函数，发现粘合物材料的寿命可以以流变方式描述。随着这些数据在将来越来越多地积累，必须在更大程度上完善粘合材料的寿命的理论。