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以马来海松酸和乙酸镧为原料,采用溶剂法合成了马来海松酸镧(MPALa)。研究了原料物质的量比、温度和时间对产物的影响,并利用傅里叶红外光谱仪、扫描电镜(带能谱仪)和X射线衍射仪对产物进行分析和表征。另外,通过刚果红试纸法和热烘箱老化法研究了MPALa作为热稳定剂对聚氯乙烯(PVC)热稳定性的影响。结果表明:马来海松酸中的—COO-与La3+发生了化学键合,生成了非晶态的MPALa。最佳反应条件为马来海松酸和乙酸镧的物质的量比n马来海松酸:n乙酸镧=1:1.8、反应温度60℃、反应时间6 h,产率可达95%以上。此外,MPALa具有较好的热稳定效果,是一种环保型PVC热稳定剂。
Maleated pimaric acid and lanthanum acetate were used as raw materials to synthesize maleated lanthanum malate (MPALa) by solvent method. The effect of the ratio of raw materials, temperature and time on the products was studied. The products were analyzed and characterized by Fourier transform infrared spectroscopy, scanning electron microscopy (SEM) and X-ray diffractometer. In addition, the influence of MPALa as heat stabilizer on the thermal stability of polyvinyl chloride (PVC) was studied by Congo red test paper method and hot oven aging method. The results showed that -COO- in maleopimaric acid was chemically bonded with La3 +, resulting in the formation of amorphous MPALa. The optimal reaction conditions were as follows: the amount ratio of maleopimaric acid to lanthanum acetate was nM malachinoic acid: lanthanum acetate = 1: 1.8, the reaction temperature was 60 ℃, the reaction time was 6 h, and the yield was more than 95%. In addition, MPALa has good thermal stability, is an environmentally friendly PVC heat stabilizer.