Applied Fundamental Research Of Lignin Enhanced Emulsion-Polymerized Styrene Butadiene Rubber

At present, emulsion-polymerized styrene butadiene rubber is the most common rubber species. It belongs to non-crystalline rubber. Its tensile strength is very low. It is almost not useful value if it is not reinforce by the reinforcing agent. The fillers have a very important effect on the properties of styrene-butadiene rubber. ESBR has useful value only after reinforced by the reinforcing filler. Since the 20 th century, carbon black has been the most important rubber reinforcing agent. But the process of carbon black caused seriously pollution on the environment, relatively high price. And its raw material is dependent on the current very shortage of oil resources. With lignin instead of the traditional reinforcing agent-carbon black is conducive to the rubber reinforcing filler of low cost, environmental protection. Then we can realize the industrialization application of lignin.This paper studied condensation temperature, stirring speed, stabilizer dosage, reinforcing filler addition method and sequence of adding, condensation system pH value, water/cement ratio, the dosage of saturated salt water and three alkyl ammonium chloride factors on the reinforcement effect of styrene-butadiene rubber reinforcing filler. Through experimental research, we determine the best repair process of reinforcing emulsion polymerized styrene butadiene rubber by reinforcing filler. Condensation temperature 45℃, stirring speed 200~300rpm,reinforcing filler dispersion before they join, condensation system pH 3~5, water/cement ratio 5:1~4:1, saturated salt water 10~20, three alkyl ammonium chloride 0.06 etc. Filler reinforcing emulsion-poly styrene butadiene rubber works best.The reinforcing effect of lignin as reinforcing filler reinforced emulsion polymerized styrene butadiene rubber was studied. Studies have shown that: when the dosage of lignin to 40 g, the tensile strength increased from 27.8 to 29.5MPa, 300% tensile strength(MPa) can be increased by about 15%, tensile elongation increased from 440% to 464%, Wear abrasion decreased to 0.09cm3 from 0.108cm3, rubber abrasion/cm3 can reduce about 20%. When lignin 20 g, the rubber aging resistance coefficient K increased from 0.585 to 0.675, increased about 20%. Lignin dosage of 20~40g, rubber has good comprehensive performance.The reinforcing effect of lignin/MMT complex as reinforcing filler reinforced emulsion polymerized styrene butadiene rubber was studied. Studies have shown that: when the dosage of lignin/MMT complex is 5g, the tensile strength increased from 24.7 to 27.5MPa, tensile strength can be increased by about 12%, tensile elongation increased from 360% to 390%, wear abrasion decreased from 0.108cm3 to 0.073cm3, rubber abrasion can reduce about 33%. When lignin 10 g, the rubber aging resistance coefficient K increased from 0.52 to 0.636, increased about 23%. When the dosage of lignin/MMT complex is about 5~10g, rubber has good comprehensive performance.Finally, the best reinforcing process route and conditions of lignin reinforcing emulsion-polymerized styrene butadiene rubber were determined; the reinforcing filler of lignin /MMT composite was prepared; lignin and lignin/MMT complex all can improve the performance of rubber. Under the same performance condition of ESBR, the dosage of lignin/MMT composite is less than lignin; and has achieved the anticipated target of using lignin and lignin/MMT complex to reinforce emulsion-polymerized styrene butadiene rubber.