黑液-蒙脱土/聚氯乙烯/丁腈橡胶热塑性弹性体的制备及性能研究

采用蒙脱土对造纸黑液中的木质素进行絮凝沉淀,制备黑液-蒙脱土复合物(BL-MMT),然后将其应用于聚氯乙烯/丁腈橡胶(PVC/NBR)热塑性弹性体,并对其力学性能、耐老化性能及热降解性能进行测试。结果表明:随着BL-MMT中木质素蒙脱土比例增大,热塑性弹性体力学性能先增大后减小,适宜配比m(木质素)∶m(蒙脱土)=1∶1。BL-MMT份数增大,热塑性弹性体力学性能先增大后减小,20份时出现最大值。BL-MMT填充的PVC/NBR热塑性弹性体与添加炭黑和碳酸钙相比,力学性能和热性能相当,而耐老化性能更为优越。黑液-蒙脱土复合物可望用作PVC/NBR热塑性弹性体的补强剂。

Study on Preparation and Properties of Black Liquor Montmorillonite Complex/PVC/NBR Thermoplastic Elastomer

A black liquor-montmorillonite complex(BL-MMT) was prepared by flocculating precipitation of lignin in black liquor with montmorillonite,and applied in the preparation of PVC/NBR thermoplastic elastomer composites.The mechanical properties,aging performance and thermal properties of the PVC/NBR composites were tested.The experimental results indicated that the mechanical properties of BL-MMT/PVC/NBR composites were affected by the loadings and composition of BL-MMT complex.A high performance was achieved at a lignin/MMT ratio of 1∶1.The mechanical properties of BL-MMT/PVC/NBR increase with the loading of BL-MMT up to 20 phr.A comparison study was also performed using carbon black and calcium carbonate as comparative fillers.There is no significant mechanical and thermal property difference among BL-MMT,carbon black and calcium carbonate as fillers for PVC/NBR composites.However,the aging property of BL-MMT/PVC/NBR was the best.All experimental results indicated that BL-MMT could be an effective reinforcing agent in PVC/NBR thermoplastic elastomer.