轮胎用高性能低生热SSBR橡胶的制备及其性能的研究
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摘要
本论文的目的是研究出一种轮胎用高性能低生热的橡胶配方体系。研究了不同种类的SSBR,不同种类炭黑,无硫硫化体系与低硫硫化体系,以及不同添加量的nano-ZnO对于橡胶的物理机械性能和低生热性能的影响。
     研究结果表明:SSBR2305较SSBR312和SSBR302有着更为优异的低生热性能;新炭黑有着比其他类型炭黑都优异的降低材料生热的能力;其他的助剂如A151,古马隆,均匀剂如果能使用适当,也能提高材料的生热性能和物理机械性能。新炭黑的最佳使用量为50phr,超过50phr时,材料的物理机械性能出现下降,生热也开始升高;Al_2O_3的少量使用可以提高材料的物理机械性能,但是生热会增加,继续增加Al_2O_3用量时,材料的生热性能开始变好;ZnO方面,用量在10phr时,生热性能较低。无硫硫化体系较硫磺硫化体系,有更为优异的低生热性能和物理机械性能;Mg(OH)_2作为导热填料加入无硫硫化体系时,Mg(OH)_2的添加量不可过多,过多的Mg(OH)_2体系会存在Mg(OH)_2分散不均的问题,从而导致材料的生热增加,物理机械性能降低,最为合适的Mg(OH)_2的使用量是50phr。
     Nano-ZnO作为导热填料添加入橡胶时,研究结果表明:nano-ZnO/SSBR复合材料的拉伸和撕裂强度是随着nano-ZnO的份数的增加而增大的;导热系数随着nano-ZnO用量的增加而增加,大致能分为三个阶段:第一阶段是0~120phr,第二阶段是120phr~210phr,第三阶段是210phr~240phr,每个阶段中导热系数的变化随nano-ZnO用量大致是线性的,并用Nielsen模型计算了理论的nano-ZnO/SSBR复合材料的导热系数,发现与实际材料的导热系数相差不大;从材料断面的SEM照片和△G'的变化趋势中,都可以反应出与之前研究的导热系数变化相一致的规律,即我们可以通过SEM照片的直观表现和△G'的变化规律上推测导热性能的变化。
This paper aimed at researching a kind of high performance-low heat generation for tyres.Investigated the physical and mechanical properties and low heat genetation property using different kinds of SSBR,different kinds of carbon black,sulfurless cure and effective vulcanization system, and different amount of nano-ZnO.
     Results showed that compared with SSBR312 and SSBR302, SSBR2305 had better performance in heat generation;new carbon black could debase heat generation more effectively than other kinds of carbon black;if used properly,other addition agents such as A151,coumarone can also improve the physical and mechanical properties and low heat genetation property.The best amount to use new carbon black is 50phr, the physical and mechanical properties would go down and more heat would generate when dosage was more than 50phr;the physical and mechanical properties would be improved with small dosage of Al_2O_3 but heat generation would increase,when dosage increases,heat genetation property began to get better;when the dosage of ZnO was 10phr,the material didn't perform well in heat generation.Compared with sulfurless cure system,effective vulcanization system had better performance in heat generation and physical and mechanical properties;when Mg(OH)_2 was used as heatconducting filler in sulfurless cure system,its dosage shouldn't be too high,which would lead to more heat generation and physical and mechanical properties decline.Because of non-homogeneous distribution,the best amount was 50phr.
     When Nano-ZnO was used as heatconducting filler in rubber,result showed that tensile-peer strength of nano-ZnO/SSBR composite would grow when amount of nano-ZnO increased,and so was thermal coefficient;generally there were three parts:the first was 0~120phr,the second was 120phr-210phr and the third was 210phr-240phr,change of thermal coefficient caused by nano-ZnO in each stage was generally linear,then calculated theoretic thermal coefficient of nano-ZnO/SSBR composite with Nielsen model,and discovered that there wasn't obvious difference between it and the actual value;thermal coefficient would grow when amount of nano-ZnO increased,which could both be reflected in SEM photo of the rubber section and change rule of△G',which meaned that the change of thermal coefficient could be deduced by SEM photo and change rule of△G'.
引文
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