钛酸酯偶联剂对碳酸钙的表面改性及其对PVC材料性能的影响

Surface modification of calcium carbonate with titanate coupling agents and its effects on the properties of PVC materials

采用两步法自制了钛酸酯偶联剂,用其和硬脂酸对轻质CaCO3进行了表面改性处理,考察了改性CaCO3对PVC材料的流经时间、密度、热稳定时间、加工性能和力学性能的影响。结果表明:①自制的钛酸酯偶联剂需要与硬脂酸配合使用才能对CaCO3起到较好的改性效果;②结合生产实际进行综合考虑,两者适宜的质量分数(以CaCO3质量为100%计)分别为1%和0.5%。

Titanatc coupling agcnts wcrc prcparcd by two-stcp mcthod. Thc surface of light cal- cium carbonatc was modificd with thc titanatc coupling agcnts and stcaric acids. Thc cffccts of mod- ificd calcium carbonatc on thc flow time, density, thcrmal stability, proccssability and mechanical propcrtics of PVC matcrials wcrc invcstigatcd. Thc rcsults showcd that： ① thc titanatc coupling a- gent and stcaric acid should bc used synergistically to play better modification effect on CaCO3 ;② considering the practical production, the suitable mass fraction of titanatc coupling agents and stcaric acids was 1% and 0.5% （based on 100 wt% CaCO3 respectively.