摘要
运用膨胀石墨(EG)与玻璃纤维(GF)对聚氨酯材料协同改性,分析了EG对聚氨酯热失重、阻燃与力学特性的影响。结果表明,当EG加入量增大后,试样的热稳定性也明显获得提升。当EG添加量持续上升后,试样的极限氧指数(LOI)也明显升高,当EG含量超过13. 8%时试样属于难燃材料。EG除了能够改善聚氨酯阻燃性以外还会明显降低压缩性。聚氨酯变形尺寸在1. 6 mm以内时剪切强度表现为先缓慢增大,之后快速升高并到达一个峰值。采用GF与EG协同改性使质量保持率略微升高。当温度达到900℃时,试样的质量保持率上升了约5%。加入EG和GF时可以在聚氨酯基体中发挥协同作用,表现为随GF含量的升高压缩强度发生了先增大后减小的现象。当GF添加量增大后,聚氨酯剪切强度先增大后降低。
Using expanded graphite( EG) and glass fiber( GF) to realize the collaborative modification of polyurethane, the effects of EG on thermogravimetry, flame retardant and mechanical properties of polyurethane were analyzed. The results show that the thermal stability of the sample is significantly improved with the increase of EG. When the addition of EG continues to rise,the LOI value of the sample also increases significantly. And when the amount of EG exceeds 13. 8%,the sample belongs to the refractory material. EG could not only improve the flame retardancy of polyurethane,but also significantly reduce the compressibility. When the deformation size of polyurethane is in 1. 6 mm,firstly the shear strength could increase slowly,then could increase rapidly to achieve a peak. The synergistic modification of GF and EG could slightly increase the mass retention rate. When the temperature reaches 900 ℃,the quality of the sample retention increases 5%. EG and GF could play a synergistic role in polyurethane matrix when they are added,which shows that the compression strength firstly increases and then decreases with the increase of GF contents. When the addition of GF increases,the shear strength of polyurethane increases first and then decreases.
作者
霍治澎
HUO Zhi-peng(School of Architecture and Engineering,Yanan University,Yanan 716000,China)
出处
《塑料工业》
CAS
CSCD
北大核心
2019年第4期101-104,共4页
China Plastics Industry
基金
国家自然科学基金项目(51768073)
关键词
膨胀石墨
聚氨酯
保温材料
性能表征
Expanded Graphite
Polyurethane
Insulation Material
Performance Characterization
