EG与GF改性聚氨酯保温材料的阻燃及力学性能

Flame-Retardant and Mechanical Properties of Polyurethane Insulation Materials Modified by EG and GF

为提高聚氨酯保温材料应用的安全性,利用无机材料可膨胀石墨(EG)与玻璃纤维(GF)对聚氨酯保温材料进行改性。通过测试常规与改性聚氨酯保温材料的热重、极限氧指数(LOI)、压缩强度与剪切强度,对比分析EG与GF对聚氨酯保温材料阻燃及力学性能的影响。结果表明,聚氨酯保温材料的热稳定性随着EG质量的增加而逐渐增强,LOI随着EG质量的增加呈指数上升,但压缩强度和剪切强度出现不同程度的下降;EG和GF同时使用时,能协同增加聚氨酯保温材料的阻燃性能,但GF的影响有限;随着GF添加量的增加,聚氨酯保温材料的力学性能先上升后下降,EG质量分数为8.1%时,GF最佳质量分数为10.2%。

In order to improve the application safety of polyurethane insulation materials,inorganic materials expanded graphite(EG)and glass fiber(GF)were used to modify polyurethane insulation materials.The effects of EG and GF on the flame-retardant and mechanical properties of conventional and modified polyurethane insulation materials were compared and analyzed by testing their thermogravimetric,oxygen index,compressive strength and shear strength.The results show that the thermal stability of polyurethane insulation materials increases with the increase of EG content,the oxygen index increases exponentially with the increase of EG content,but the compressive strength and shear strength decrease in varying degree.When EG and GF are used at the same time,the flame-retardant properties of polyurethane insulation materials can be increased synergistically,but GF has an effect on it.With the increase of GF content,the mechanical properties of polyurethane insulation materials increase first and then decrease,which can predict the optimal GF content.When the fraction mass of EG is 8.1%,the optimum GF content is 10.2%.