复合阻燃剂对HFC-365mfc发泡聚氨酯硬泡性能的影响

Effects of the Composite Flame Retardant on the Properties of Rigid Polyurethane Foams Blown by HFC-365mfc

采用环保型物理发泡剂HFC-365mfc和十溴二苯乙烷（DBDPE）／三氧化二锑（Sb2O3）复合阻燃剂制备了综合性能良好的硬质聚氨酯泡沫（RPUF）绝热材料，探讨了DBDPE与Sb2O3协同阻燃的最佳配比以及在此配比下不同添加量对RPUF的燃烧性能、绝热性能、闭孔率和压缩性能的影响。结果表明，复合阻燃剂对RPUF材料具有良好的阻燃效果，DBDPE／Sb2O3质量比为4：1时效果最好。在密度约为65kg／m3的情况下，所制得RPUF材料的阻燃性能随阻燃剂用量的增加而提高，当添加质量分数为30％时，RPUF的氧指数可达30．1，水平燃烧性能也有很大的提高。阻燃剂的加入并不影响材料的绝热性能，导热系数范围为27．3—28．4mW／（m·K），闭孔率可达93％-96％，力学性能同样能满足对绝热保温材料的要求。

Rigid polyurethane foams （RPUF） with good comprehensive performance were prepared by using an environment friendly blown agent of HFC-365mfc and flame retardant composite of decabromodiphenyl ethane （DBDPE）/Sb2O3. The optimum ratio in the flame retardant composite and its effect on the flame-retarding quality, mechanical properties, thermal insulation and closed cells content of RPUF were discussed. It was found that DB- DPE/Sb2O3 was an effective flame retardant composite for RPUF especially at an optimum mass ratio of DBDPE/ Sb203 of 4 ： 1. The addition of 30~/o flame retardant composite increased the value of LOI to 30. 1 and improved the properties of horizontal combustibility while the low thermal conductivity （27.3 - 28.4 roW/（ m K）） and high content of closed cells （93% - 96% ） of RPUF with a higher density of 65 kg/m3 could be remained. The obtained RPUF could meet the mechanical requirement for ordinary thermal insulating materials.