PVC糊树脂对交联PVC泡沫塑料的影响

Influence of PVC Paste Resin on Cross-Linked PVC Foam Plastic

通过水煮发泡制备交联聚氯乙烯泡沫塑料,讨论了聚氯乙烯(PVC)糊树脂对泡沫制备过程中经制糊、模压和发泡工艺得到的产物的影响,研究了PVC糊树脂对制备的交联PVC泡沫压缩性能的影响。结果表明:制备交联聚氯乙烯泡沫塑料适宜的糊黏度是4～9Pa.s;PVC糊树脂的K值较大或水萃取液pH值呈碱性可有效防止模压过程中PVC的降解;PVC糊树脂的水萃取液pH值呈碱性可催化发泡反应,有利于得到低密度泡沫且缩短发泡时间;随着其K值增加,制备的泡沫压缩强度增大,但是K值过大时,制备的泡沫泡孔较大,压缩强度反而降低,适宜的K值为70～80。

Cross-linked PVC foam plastic was prepared by boiling foaming method. Influence of PVC paste resin on products obtained from pasting process, molding process, foaming process and compression property of foam was studied. The results show that appropriate paste viscosity is 4 to 9 Pa·s. K-value of PVC paste resin is larger or being alkaline of PVC paste resin can prevent PVC degradation in molding process. Being alkaline of PVC paste resin can accelerate foaming reaction,will benefit to obtain low density foam and reduce foaming time. With K-value of PVC paste resin increasing, compression property of foam increased. When K-value is extremely big, cellular size of foam become bigger and compression strength re- duce,appropriate K-value is 70 to 80.