The Preparation And Application Of Starch/SBR Composites

It is reported that corn starch, which partly replace carbon black (CB) and silica, can improve the tractive properties, hysteresis loss and reduce rolling resistance of tire. The effects of starch partly instead of CB and silica on starch/CB/SBR composites were studied.Starch/SBR compound was prepared by LCM, then mixed with CB to change the starch/CB ratio (total filler contents is 60 phr). The results showed that the addition of starch (<10phr) had a little effect on the mechanical properties and abrasion resistance. Vulcanization curves showed that starch could delay the vulcanization. RPA results showed that tan8 of the composites reduced, DMTA indicated that glass transition temperature (Tg) changed little.Starch/CB/SBR composites were prepared by mechanical compounding method (MCM) with the ratio of starch/CB added. The results showed that the elongation of the composites increased and tensile strength reduced with the increasing of starch loading. The dynamic heat built-up and power-loss reduced. DMTA results indicated that the wet skid resistance was improved and the glass transition temperature changed little. The coupling agents KH-792 and Si-69 and different adding methods to modify the mixed fillers were studied. The results indicated that Si69 modified starch/CB filler then heat processing can improve dynamic properties.The water swelling and the mechanical properties of starch/SBR and starch/carbon black/SBR composites after 90-day water immersion at the room temperature were investigated. The results showed that the water swelling of composites increased with increasing starch loading. In the range of 20 phr starch, during 90-day water immersion, the mechanical properties of starch/CB/SBR composites, pure SBR vulcanizate and CB/SBR composites exhibited the similar change trend with increasing time of water immersion. The mechanical properties of starch/CB/SBR composites fluctuated within 30-day water immersion; while after 90-day water immersion, the mechanical properties of the composites were almost the same as those before water immersion.The properties of starch/NBR composites were investigated. The results indicated that quality swelling rate and volume swelling rate reduced with more starch loading, and the mechanical properties changed a little.