对苯二甲酸脂肪醇酯的合成及性能研究

研究了C₄、C₆、C₈、C₁₀和C₁₄等饱和脂肪醇与对苯二甲酸合成对苯二甲酸脂肪醇酯的方法,并对比了其结晶点、密度、闪点等物化性能。结果表明,C₆及以下的脂肪醇在常压低温下很难与对苯二甲酸反应,而C₈及以上的脂肪醇在催化下易与对苯二甲酸反应;且C₄的对苯二甲酸二丁酯闪点只有180 ℃;C₁₄醇和酯熔点(结晶点)分别达38和67℃,不便于生产操作和使用;而C₈、C₁₀与对苯二甲酸的酯化物介于液固交界处,且闪点不低于210℃,是合成对苯二甲酸酯类增塑剂的合适原料。

Synthesis and Performance of Aliphatic Alcohol-based Terephthalate

The synthesis methods of aliphatic alcohol-based terephthalate were studied using terephthalic acid and saturated aliphatic alcohol (C₄, C₆, C₈, C₁₀ and C₁₄) as raw materials. And the physicochemical properties such as crystallization points, densities, and the flash points et al. were contrasted. The results indicated that the reactions of aliphatic alcohols of C₄ and C₆ with terephthalic acid at ordinary pressure and low temperature were difficult, and the aliphatic alcohols of C₈, C₁₀ and C₁₄ could easily react with terephthalic acid under catalysis. The flash point of butylene terephthalate (C₄) was 180 ℃. The melting (crystallization) points of alcohol and ester (C₁₄) were 38 ℃ and 67 ℃, respectively, but it was not convenient for the operation and use. While terephthalic esters of C₈ and C₁₀ aliphatic alcohols were between liquid-solid junction, and the flash points were not less than 210 ℃, they were suitable raw material for the synthesis of terephthalic acid esters plasticizer.