用于PVC原位聚合改性的纳米碳酸钙乳液的制备及其性能

The preparation of nano—CaCO_3 emulsion for the in—site polymerization modification of PVC and its properties

比较了聚乙烯醇、十二烷基苯磺酸钠、聚丙烯酰胺、乳化剂TY-01作为纳米碳酸钙的乳化剂时的乳化效果;选用乳化剂TY-01时,确定了其最佳用量以及搅拌、超声波振荡的工作参数;研究了乳化液固含量对黏度和pH值的影响;通过投射电镜观察了纳米碳酸钙的分散情况。结果表明:①4种乳化剂中,乳化剂TY-01的乳化效果最好,其与纳米碳酸钙的最佳质量比为1:20;②配制乳化液时,搅拌转速应大于800 r/min,提高搅拌转速、进行超声波振荡可以缩短搅拌时间;③随着乳化液固含量的增加,乳化液的pH值基本不变,乳化液黏度急剧增大;④添加乳化剂的纳米碳酸钙在水中分散均匀,且粒度均匀,平均为50 nm。

The emulsifying effects of poly （vinyl alcohol）, sodium dodecyl benzene sulfonate, polyacrylamide and emulsifying agent TY - 01 on nano - CaCO3 were compared. The optimum using amounts of emulsifying agent TY - 01 were determined as well as the working parameters of agitation and ultrasonic oscillation. Influences of solid contents in emulsion on viscosity and pH val- ue were studied. The dispersion of nano - CaCO3 was observed by SEM. The results showed that ： （1）amoung the four kinds of emulsifying agent,the emulsifying effect of emulsifying agent TY- 01 was the best,and the optimum mass ratio of emulsifying agent TY- 01 to nano- CaCO3 was 1 ： 20; （2）during the preparation of emulsion,the stirring speed would be more than 800 r/min, and the stirring time could be shortened if the stirring speed was increased or ultrasonic oscillation was adopted; （3）with the increase of solid contents in emulsion, the pH value of emulsion was kept essen- tially constant and its viscosity was increased sharply; （4）nano- CaCO3 treated by emulsifying agent could homogeneously disperse in water and had uniform granularity with even particle size 50 nm.