改性空心玻璃微珠对约束层轻量化影响研究

Study on the Effect of Modified Hollow Glass Microspheres on the Lightweight of the Constraint Layer

为制备低密度、高模量的轻量化约束阻尼材料,使用A187对空心玻璃微珠表面进行改性处理,通过扫描电镜观察改性结果。进一步将改性后的空心玻璃微珠加入到约束阻尼涂料中,通过力学性能、极限氧指数、导热系数、复合损耗因子等测试,考察改性后的空心玻璃微珠对约束层各项性能的影响。结果表明:A187可以成功完成表面改性,随着空心玻璃微珠用量的增加,约束层密度降低、模量降低、黏度先降低后升高、氧指数提高、导热系数降低。添加6%改性空心玻璃微珠后,弯曲模量保持率为90.2%,密度降低16.67%,阻尼损耗因子整体温域仅少量降低,降低约束层密度的同时,保证了阻尼材料的降噪特性。

In order to prepare lightweight constrained damping material with low density and high modulus,the surface of hollow glass microspheres was modified by A187,and the surface modification results were observed by scanning electron microscopy.Further,the modified hollow glass microspheres were added into the constrained damping coating,and the influence of the modified hollow glass microspheres on the properties of the constrained layer was investigated by the testing mechanical properties,limiting oxygen index,thermal conductivity,composite loss factor,etc.The results show that A187 can modify the surface of hollow glass microspheres.With the increase of the amount of hollow glass microspheres,the density of the constrained layer decreases,the modulus decreases,the viscosity decreases first and then increases,the oxygen index increases,and the thermal conductivity decreases.When 6%modified hollow glass micro spheres were added,the bending modulus retention rate was 90.2%,the density was reduced by 16.67%,and the overall temperature range of damping loss factor was reduced only slightly.The noise reduction characteristics of damping material were ensured while the density of constraint layer was reduced.