热平衡复合发泡剂发泡不饱和聚酯树脂

Foaming unsaturated polyester resin using thermal equilibrium composite foaming agent

依据热平衡发泡原理,选择NaHCO3、偶氮二甲酰胺(AC)、偶氮二异丁腈和4,4-氧代双苯磺酰肼组成不同热平衡复合发泡剂发泡不饱和聚酯树脂,通过示差扫描量热仪(DSC)、扫描电镜(SEM)和力学性能测试对其发泡机制进行了研究。结果表明:先吸热后放热的热平衡复合发泡剂发泡材料泡孔孔径小且分布均匀。AC与NaHCO3质量比为6∶4组成的热平衡发泡剂制得的发泡不饱和聚酯树脂的表观密度为0.546 g/cm3,压缩强度为13.73 MPa,比压缩强度达到25.15 MPa/(g.cm-3)。

The NaHCO3,azodicarbonamide（AC）,azo-bis-isobutyronitrile and 4,4-oxy bisbenzene sulfonyl hydrazide were selected and composed of the thermal equilibrium composite foaming agents for foaming the unsaturated polyester resin in accordance with the principle of thermal equilibrium foaming.The foaming mechanism was investigated by differential scanning calorimetry instrument（DSC）,scanning electron microscopy（SEM） and mechanical property testings.The results showed that the bubble hole diameter of foamed material using the prior endothermic/posterior exothermic equilibrium composite foaming agent was small and had uniform distribution.The apparent density,compressive strength and specific compression strength of foamed unsaturated polyester resin using composite foaming agent of AC and NaHCO3 with mass ratio of 6∶ 4 were 0.546 g/cm3,13.73 MPa,and 25.15 MPa/（g · cm-3）,respectively.