The Design,Preparation And Lab Scale Application Study Of S-SBR/silica Master Batch By Solution Compounding

Silica is one of the important raw materials of "green tires".Silica can improve the wet skid resistance and reduce the rolling resistance of tires when it is used as filler in rubber and it can finally save fuel consumption of cars.However,the silicon hydroxyl on the surface of silica will lead to self-aggregation,which will affect the dispersion of silica in rubber matrix.Herein,it is necessary and desirable to use silane coupling agent to modify the surface of silica.The traditional dry mixing process has some disadvantages including high temperature rising,difficulty to compound as well as dust pollution during the mixing process.At present,there are many studies focused on wet compounding which could solve the problems of traditional dry mixing method for rubber emulsion,but only a few researches have studied the wet compounding method of solution styrene butadiene rubber which is synthesized by solution polymerization method.Firstly,we investigated the effect of coupling agent on the properties of SSBR/silica nanocomposites by traditional dry mixing process.We studied and compared five different kinds silane coupling agents and the results indicated that the composite combined with Si747 has the best performance in mechanical property,dynamic mechanical thermal property and abrasion resistance.What's more,Si747 can be dissolved in water,so silica can be modified in water with Si747.So we concluded that Si747 is the best among five silane coupling agent.Then,we used different amount of Si747 and investigated the comprehensive properties of the nanocomposites.The results demonstrated that the nanocomposite had the best performance when the amount of Si747 was 10%.Next,we modified silica with 10%Si747 in water;FTIR,TGA and water contact angle test showed that the silane coupling agent was successfully grafted onto the surface of silica.Secondly,modified silica was dispersed in cyclohexane and then mixed with SSBR rubber solution.The SSBR/silica nanocomposite was fabricated by removing the solvent.The mixing time of wet compounding method was studied in order to shorten the time required to prepare the masterbatch without changing the properties of the SSBR/silica nanocomposite.Finally,the SSBR/silica masterbatch was prepared by one-step solution compounding method.The TGA indicated that the amount of silica actual loading content in the masterbatch could matched with the theoretical amount;the TEM showed that the silica was dispersed uniformly in the masterbatch.What's more,the SSBR/silica nanocomposite prepared by one-step solution compounding method can lead to reduced 22.6%temperature rising and 33.3%energy consumption compared with traditional dry compounding method.In conclusion,the comprehensive property of SSBR/silica nanocomposites by one-step solution compounding method was better than traditional dry compounding method or two-step solution compounding method.