Abstract:

In order to develop phenolic epoxy based film forming material with high heat resistance, it could meet the requirements of heat resistance of fire retardant coatings. Phenolic epoxy emulsion was prepared by phase inversion technique, and the effects of emulsifier type, emulsifier dosage, and co-solvent dosage on the properties of emulsion were discussed by orthogonal experimental range analysis method. The heat resistance and fire resistance of the cured film were studied by DSC, TG and MCC. The results showed that the phenolic epoxy emulsion was prepared with the emulsifier of 6% hydroxyl group and epoxy group material ratio of 1∶1 and 6% cosolvent, the average particle size was 900 nm, the distribution was uniform and the stability was good. The glass transition temperature of phenolic epoxy emulsion was 98. 78 ℃, and the carbon residue rate was 17. 7% at 800 ℃, both of them were significantly higher than those prepared by ordinary bisphenol A epoxy emulsion. The heat release rate of phenolic epoxy film during combustion was lower than that of ordinary bisphenol A epoxy film, which had the advantages of being suitable for fire retardant coatings.

Key words: phenolic epoxy emulsion; emulsifier, thermal decomposition kinetics, heat release rate, heat resistance

摘要：

为了开发具有高耐热性的酚醛环氧基成膜物，满足防火涂料耐热性能的要求。以相反转技术制备了酚醛环氧乳液，利用正交实验极差分析法，探讨了乳化剂种类、乳化剂用量及助溶剂用量对乳液性能的影响，并通过 DSC、TG、微型量热分析（MCC）对其固化漆膜的耐热和防火性能进行研究。结果表明：采用 6%由羟基与环氧基物质的量比为 1∶1时合成的乳化剂、6%助溶剂制备的酚醛环氧乳液，粒径最小为 900 nm，分布均一且稳定性好。酚醛环氧乳液制备的漆膜的玻璃化转变温度为 98. 78 ℃，800 ℃时残炭率为 17. 7%，均显著高于由普通双酚 A 型环氧乳液对应漆膜的。且酚醛环氧漆膜在燃烧时的热释放速率低于普通双酚A型环氧乳液对应漆膜的，可应用于防火涂料。

关键词: 酚醛环氧乳液, 乳化剂, 热分解动力学, 热释放速率, 耐热性

CLC Number: 

• TQ630. 4