基于生物柴油的二聚化及其聚酰胺树脂的合成

Preparation of dimeric fatty acid methyl esters and their polyamides from biodiesel

以乌桕梓油生物柴油为对象,研究了不饱和脂肪酸甲酯二聚体的制备及聚酰胺树脂的合成。结果表明,二聚体合成最优工艺条件为:催化剂膨润土加入量12%(质量分数),催化助剂LiCl 0.8%(质量分数),反应温度220℃,反应时间6 h。在此条件下,二聚体收率为75.2%。以上述所得二聚体进一步制备聚酰胺树脂,并将其应用于环氧树脂固化体系中,对聚酰胺树脂固化物产品进行DSC、耐热性和力学性能测试。结果表明,当聚酰胺与环氧树脂固化体系质量比为0.6∶1时,固化反应最完全,固化物产品的耐热性能最高,抗冲击、弯曲及剪切性能最强,其性能与市售同类产品相当。

The preparation of dimerie fatty acid methyl esters and their polyamides from Chinese kernel oil biodiesel has been investigated. The results showed that the optimum conditions for dimeric fatty acid methyl ester synthesis were： amount of bentonite catalyst 12% （based on the weight of fatty acid methyl esters）, catalytic additives LiC1 0.8% （based on the weight of fatty acid methyl esters）, reaction temperature 220 ℃ , reaction time 6 h. Under these conditions, the yield of dimeric fatty acid methyl esters was 75.2%. The preparation of polyamides from the dimeric fatty acid methyl esters and their application in epoxy resin curing systems were further studied. By means of DSC, and experimental measurements of heat resistance and mechanical properties of the cured product, it was found that the highest heat resistance and impact resistance, and strongest bending and shear properties, were obtained when the mass ratio of polyamide resin and epoxy resin curing system was 0.6： 1. It was concluded that the performance of polyamides from Chinese kernel oil biodiesel is comparable to similar products available commercial- ly.