酚醛在丙烯酸树脂防火改性中的应用

Application of phenolic resin on the improving flame retardancy of acrylic acid resin

以酚醛树脂为主防火剂、胺类为协效剂,研究了其种类、用量对丙烯酸树脂防火性能的影响,采用锥形量热仪和热重分析仪对酚醛改性丙烯酸树脂的燃烧性能和热稳定性进行了测试,并对燃烧后的炭层结构进行了电镜分析。结果表明,硼酚醛树脂能显著提高丙烯酸树脂的防火性能,硅酸铝、六次甲基四胺具有有良好的协效作用;当丙烯酸树脂与硼酚醛树脂质量比为50:50,硅酸铝质量分数为7%,六次甲基四胺为2%时,改性树脂耐燃时间达到39min,点燃时间(TTI)及热释放速率峰值出现时间明显延长,热释放速率明显降低,800℃时残炭率为45%,热稳定性明显提高,燃烧烧后形成了表面为致密网状、断面为微细泡孔状的炭层结构,防火性能提高。

Using phenolic resin as main flame retardant, amine as synergistic agent , the effect of their variety and the dosage on the flame retardancy of acrylic resin was studied. The combustion performance and thermal stability of phenolic rsin modified acrylic resin were tested by cone calorimeter and TG. The microstructure of char layer after burning was analyzed by SEM. The result shows that boron -modified phenolic resin could significantly improve the flame retardancy of acrylic resin. The hexamethylene tetramine and aluminum silicate had good synergistic effect. The fire retardant time of modified resin was 39 min. The time to ignition（TTI） and peak heat release rate （peak HRR） appearing time were postponed obviously and the heat release rate was reduced with the mass ratio of acrylic acid resin to boron- modified phenolic resin 50： 50, aluminum silicate content 7% and hexamethylene tetramine 2%. The char yield of the modified resin was 45% at 800 ℃ and the thermal stability of it was improved obviously. The surface of the char layer had network structure and the section of it had fine porous structure therefore the flame retardancy of the modified resin was improved.