蓖麻油酸基聚酯多元醇的合成研究

Synthesis of Ricinoleic Acid Polyester Polyol

以可再生资源蓖麻油制备的蓖麻油甲酯、己二酸、乙二醇为原料,钛酸四正丁酯为催化剂,经酯化、缩聚合成蓖麻油酸基聚酯多元醇,考察了反应时间、催化剂、蓖麻油甲酯对聚酯多元醇热稳定性能的影响,采用凝胶色谱(GPC)、红外光谱仪(IR)、示差扫描量热仪(DSC)对蓖麻油酸基聚酯多元醇的相对分子质量、结构、热稳定性进行了系统的表征。实验表明,在醇酸(己二酸∶乙二醇)比为1.15、催化剂质量分数0.04%～0.05%、温度180℃,真空缩聚2h的条件下,制得相对分子质量为2600～3800、分布指数(PDI)为1.89～2.44的不同蓖麻油酸含量的聚酯多元醇,蓖麻油酸基聚酯多元醇的熔点随着蓖麻油酸含量的增加而降低。

Using methyl ricinoleate prepared by renewable resources castor oil, adipic acid and ethylene glycol respectively as raw materials, tetra-n-butyl titanate as catalyst, ricinoleate-based polyester polyols were prepared via polyesterification reaction. The influence of reaction time, catalyst, content of methyl ricinoleate on performance of ricinoleate-based polyester polyol was investigated. The gel permeation chromatograph （ GPC）, infrared spectrum （IR） and diferential scanning calorimeter（ DSC ）were used to measure the molecular weight, structure and thermal stability Of the products systematically. The results showed that the different ricinoleate content polyester polyols with molecular weight 2600 -3800, the distribution index （PDI） 1.89 -2.44 were given when the molar ratio of adipic acid and ethylene polyol was 1.15 ： 1, the catalyst content was 0. 04% -0. 05% , the reaction temperature was 180℃ and the vacuum polyesterification time was 2 h. The melt point of ricinoleate based polyester polyol was reduced with ricinoleate acid content increasing.