模压成型高微珠含量复合泡沫材料的制备及性能研究

Preparation and Properties of High Microspheres Levels of Syntactic Foam by Molded Forming

以牌号为HGS8000X的空心玻璃微珠为填充材料,以环氧树脂为基体,采用真空辅助模压成型法制备了空心玻璃微珠体积添加量为65%—70%的复合泡沫材料。研究了空心玻璃微珠的体积分数对材料的密度、压缩强度、吸水率以及耐静水压性能的影响。结果表明,当空心玻璃微珠体积分数为67%—69%时,材料综合性能性能最佳,可以保持50 MPa、24 h的吸水率小于1%和压缩强度大于80 MPa的情况下使材料的密度由0.65 g/cm3降低到0.60 g/cm3。分析指出,高微珠含量的复合泡沫材料的性能更大程度上依赖于由于环氧树脂缺失而导致的材料的显微结构和空心玻璃微珠受力状态的改变。

Syntactic foam with volume fraction of 65% —70% synthesized by vacuum assisted molded forming of hollow glass microspheres（ HGMs） named HGS8000 X in epoxy resin matrix is characterized for the effect of volume fraction of HGMs on density,the compressive strength,moisture absorption properties and resistance to hydrostatic pressure of syntactic foam in the present study. The results shows that moisture absorption is less than 1% after hydrostatic test of 50 MPa,24 h,and the density can reduce to 0. 60 g / cm3 from 0. 65 g / cm3 under the compressive strength greater than 80 MPa,namely,syntactic foam has the best overall performance,while volume fraction of HGMs is 67% —69%. The study provides an insight into the performance of high microspheres levels of syntactic foam depends on a greater degree of the changes in the material microstructure caused by the lack of epoxy resin and the stress state of HGMs.