composite vibration-damping materials having a resin layer sandwiched between two metal sheets can be produced by reacting prepolymers with low-molecular weight compounds having functional groups capable of reacting with the functional groups in said prepolymers to form covalent bonds and handling the resulting crosslinked resin in such a way that it is sandwiched between the two metal sheets. In accordance with the first embodiment of the invention, two low-molecular weight compounds having different numbers of functional groups per molecule are used ; in accordance with the second embodiment, two prepolymers having different numbers of functional groups per molecular chain are used ; and in accordance with the third embodiment, a mixture of a first prepolymer and a low-molecular weight compound is coated on at least one surface of two metal sheets and then a second prepolymer is dusted over the coated surface nonuniformly, followed by compressing the two metal sheets together. The thus produced composite vibration-damping materials not only exhibit satisfactory damping performance over a broad temperature range but also develop high adhesive force between the resin and metal sheets at both ordinary and elevated temperatures. In addition, good spot weldability can be imparted to the damping materials by incorporation of an electroconductive filler.
在本发明中,通过使预聚物与具有能与所述预聚物中的官能团反应形成共价键的官能团的低分子量化合物反应,并以将其夹在两块
金属板之间的方式处理所产生的交联
树脂,可以生产出具有夹在两块
金属板之间的
树脂层的复合减震材料。根据本发明的第一个实施方案,使用了两种低分子量化合物,其每个分子中的官能团数量不同;根据第二个实施方案,使用了两种预聚物,其每个分子链中的官能团数量不同;根据第三个实施方案,将第一种预聚物和低分子量化合物的混合物涂覆在两块
金属板的至少一个表面上,然后将第二种预聚物不均匀地涂覆在涂覆表面上,接着将两块
金属板压缩在一起。这样生产出的复合减震材料不仅在广泛的温度范围内表现出令人满意的减震性能,而且在常温和高温条件下,
树脂和
金属板之间都能产生很高的粘
合力。此外,通过加入导电填料,阻尼材料还具有良好的点焊性。