壳聚糖基阻燃剂制备及在防火涂层中应用

Preparation of Chitosan-based Flame Retardant and its Application in Fireproofing Coating

摘要:

以生物材料壳聚糖（CTS）、季戊四醇磷酸酯（PEPA）、二苯甲烷二异氰酸酯（MDI）为原料，制备壳聚糖基膨胀型阻燃剂（PMC）。并通过FTIR、XRD、TG对阻燃剂的结构及热性能进行了表征；以不同阻燃剂对水性环氧树脂涂层进行阻燃化改性，制备三种阻燃涂层EP1、EP2和EP3，并将阻燃涂层用做钢结构的防护涂层。用TG、极限氧指数（LOI）、UL-94、SEM对样品的热性能及阻燃性能进行了表征，用附着力实验仪测试涂层的附着力。结果表明：当PMC质量分数为10%时，EP3可通过UL-94 V-0测试；相比纯EP涂层，EP3残炭量提高47%，LOI可达25.5%。附着力测试结果表明，阻燃剂的添加不会降低涂层的附着力。

Abstract:

The chitosan-based intumescent flame retardant (PMC) containing of carbon source, acid source and gas source was synthesized by chitosan (CTS), pentaerythritol phosphate (PEPA)  and diphenyl-methane-diisocyanate (MDI). The structure and thermal stability of PMC were characterized by FTIR, XRD and TG. EP flame retardant coatings were investigated with different flame retardants and three flame retardant coatings (EP1、EP2 and EP3) were obtained. Also these flame retardant coatings were used as protective coatings for steel structure. The thermal properties and flame retardancy of the samples were characterized by TG, Limiting Oxygen Index（LOI）, UL-94 and SEM, the adhesion strength of the coatings were characterized by adhesion experiment. The results showed that the EP3, whose mass fraction of PMC is 10wt%, could meet the standard of UL-94 V-0 rating; the carbon content of EP3 increased by 47% and the LOI of EP3 reached to 25.5% compared with pure EP coating. The results of adhesion experiment showed that the flame retardants will not impair coating’s adhesion strength.