Purification and modification of palygorskite and its application in NBR

The palygorskite was purified and modified,and the influence of several modified palygorskites on NBR compound was investigated.The results showed that the purity of the purified palygorskite reached 93%,but its average particle size was only 0.92 μm;the better effectiveness was obtained for the palygorskite modified with coupling agent silane KH-560;the physical properties for the NBR compound filled with modified palygorskite improved generally when compared to those filled with unmodified palygorskite;and the modified palygorskite could be used in NBR compound instead of black N330,but its price was 75%～80% lower than that of the latter.