聚合釜釜型对偏氟乙烯乳液聚合的影响

Effect of autoclave shape on emulsion polymerization of vinylidene fluoride

偏氟乙烯(VDF)乳液聚合工艺的聚合效果关键是取决于VDF单体与水介质中助剂之间的传质效率。为研究较佳的聚合工艺参数,分别采用立式和卧式聚合釜,投入种类和规格相同的原料,在相同的温度和压力等操作条件下,研究较佳的VDF乳液聚合工艺参数。实验结果显示:釜型及搅拌桨形式在很大程度上影响了传质效率,采用卧式聚合釜能以较少的引发剂和乳化剂,得到较快的反应速率、较高的含固质量分数,且乳液稳定性更佳。因此可以认为卧式聚合釜是VDF乳液聚合较佳的聚合设备。

The polymerization effect of vinylidene fluoride（VDF） emulsion is dependent on the mass transfer efficiency between VDF and hydrotrope.To study the better polymerization process parameters with the same kind and standard material under the same operating conditions of temperature and pressure,vertical autoclave and horizontal autoclave were used in the experiment respectively.The experimental results indicate that the shape of autoclave and the type of stirring paddle influence the mass transfer efficiency to a great extent.Horizontal autoclave can obtain faster polymerizing speed,higher latex solid mass fraction,and better latex stabilization with less initiators and emulsifier.Therefore,horizontal autoclave can be considered as preferable equipment for emulsion polymerization of VDF.