SSBR橡胶耐疲劳性能与其微观结构的相关性分析

本文以6种溶聚丁苯橡胶（简称SSBR）为研究对象,考察了SSBR的耐疲劳性能与其微观结构之间的相关性。研究表明：SSBR的耐疲劳破坏性能随着苯乙烯含量、1,2-乙烯基含量、填充油量的增加而提高,随着嵌段苯乙烯含量的增加而降低;SSBR的玻璃化转变温度越接近于实际使用温度,其疲劳寿命越高;SSBR耐疲劳破坏性能与其交联密度和耐老化性能相关性显著,交联密度越低、耐老化性能越高,则SSBR的耐疲劳性能越高。     

DeltaV系统在溶聚丁苯橡胶装置上的应用

简述溶聚丁苯橡胶的生产工艺流程,介绍DeltaV系统在辽宁北方戴纳索合成橡胶有限公司年产10万吨溶聚丁苯橡胶装置上的应用,重点描述了基于DeltaV的控制系统的硬件组成和各站的功能,系统的软件组态,苯乙烯储罐的分程控制和聚合反应釜批量控制程序的组态。     

四氯化锡加料对溶液丁苯橡胶SBR质量的影响及控制

目前各国厂家普遍采用四氯化锡偶联法生产SBR[1],在聚合工艺中丁苯共聚物偶联反应的偶联效率(以下称为偶合率)对产品门尼、拉伸强度、滚动阻力都有显著影响。文章研究了以环己烷+己烷为溶剂,正丁基锂(n-BuLi)为引发剂,四氯化锡(SnCl4)为偶联剂,四氢呋喃(THF)为活性添加剂和结构调节剂的无规溶液丁苯橡胶SBR进行偶联反应时,偶联剂用量、偶联反应温度和时间、偶联前分子量大小等因素对偶联反应的影响,以及在生产中的控制方法。     

Study on the structure and properties of SSBR with large-volume functional groups at the end of chains

Solution polymerized styrene-butadiene rubber (SSBR) and SSBR with tert-Butylchlorodiphenylsilane (TBCSi, large-volume functional groups) at the two ends of macromolecular chains (T-SSBR) were prepared by anionic polymerization. The molecular structure parameters of T-SSBR and SSBR were characterized and the ratio of the amount of macromolecular chain ends connected with TBCSi to total macromolecular chain ends (i.e., end-capping efficiency) was calculated. The comprehensive properties of T-SSBR and SSBR composites filled with carbon black (CB) were investigated. The results showed that T-SSBR composites presented lower Payne effect (namely better CB dispersion) than those of SSBR composites, which led to decrease in hardness, internal friction, dynamic compression heat built-up and permanent set of T-SSBR composites, significant increase in tensile strength, elongation at break, tear strength and resilience of T-SSBR composites, and excellent balance between wet-skid resistance and rolling resistance. However, compared with SSBR composites, T-SSBR composites presented longer stress-relaxation time, bigger die-swell and higher apparent viscosity, as well as slightly inferior dynamic-cutting resistance. All the above, owing to the end-capping of TBCSi, which could immobilize the free chain ends of T-SSBR (i.e., to reduce the friction loss of molecular chains and create a greater degree of orientation in the force field), and adsorb CB, the comprehensive performances of T-SSBR were better than those of SSBR and T-SSBR terminated with styrene-TBCSi (T_S-SSBR) were far superior to those of T-SSBR terminated with butadiene-TBCSi (T_B-SSBR). Accordingly, the former was suitable for the tread of green tires.     

白炭黑/炭黑/SBR复合材料的结构和抗静电性研究

采用高温共混技术制备白炭黑/炭黑/溶聚丁苯橡胶(SSBR)和白炭黑/炭黑/乳聚丁苯橡胶(ESBR)复合材料,并分别对其结构和性能进行研究.结果表明,在填充剂总量不变的前提下,随着白炭黑用量的增大,白炭黑/炭黑/SSBR和白炭黑/炭黑/ESBR复合材料物理性能呈现加和效应的特点,动态性能提高,表面电阻和体积电阻率增大;白炭黑/炭黑/SSBR复合材料物理性能与白炭黑/炭黑/ESBR复合材料差别较小,但前者动态性能较好;添加导电炭黑使复合材料抗静电性提高、物理性能下降;当白炭黑/炭黑并用比为35/35、导电炭黑用量不大于5份时,白炭黑/炭黑/SSBR复合材料的综合性能较好.     

Fatty acid benzyl esters as bio-based plasticizers in silica-filled solution-polymerized styrene-butadiene rubber/butadiene rubber composites

Bio-oil based plasticizers have gained great attention in rubber industry as alternatives of petro-based plasticizers with high content of polycyclic aromatic hydrocarbons. In this work, five fatty acid benzyl esters were synthesized by the esterification of fatty acids (lauric acid, myristic acid, palmitic acid, stearic acid, and oleic acid, which are obtained after hydrolysis of some vegetable oils) with benzyl alcohol. They were further applied as plasticizers in silica-filled solution-polymerized styrene-butadiene rubber/butadiene rubber (SSBR/BR) composites in order to study the structure-property relationship, compared with treated distillate aromatic extract (TDAE) as standard. The composites were studied for their processability, curing, static, and dynamic mechanical properties by developing through compatibility between bio-plasticizers and polymer matrix. The results show that benzyl laurate with suitable hydrocarbon chain length and benzyl oleate with a carbon-carbon double bond have comparatively improved performance compared to TDAE in the silica-filled SSBR/BR composites.     

白炭黑填充丁苯橡胶复合体系的粘弹和加工性能研究

通过动态热机械分析仪、原子力显微镜和甲苯溶胀法对白炭黑补强的溶聚丁苯橡胶(SSBR)和乳聚丁苯橡胶(ESBR)复合体系进行综合对比。结果表明,白炭黑填充的SSBR体系相较于ESBR体系,抗湿滑性能、干路面抓着力、转弯性能和滚动阻力均得以改善,而在磨耗和冰路面抓着力方面略差。140~150℃的混炼加工温度可以较好地控制白炭黑絮凝网络,利于获得良好的物理性能和较低的疲劳裂纹扩展速度。     

微晶纤维素-二氧化硅杂化体的制备及应用研究

以正硅酸乙酯和偶联剂Si69为硅源,采用微反应器技术,在微晶纤维素(MCC)表面负载纳米二氧化硅(Si O2),制得MCC-SiO_2杂化体,研究其对白炭黑/溶聚丁苯橡胶(SSBR)硫化胶物理性能和动态力学性能的影响。结果表明:MCC杂化改性后硫化胶的物理性能和抗湿滑性能提高,同时滚动阻力降低;扫描电镜分析结果显示,MCC-SiO_2杂化体在SSBR基体中的粒径减小,与SSBR的界面结合性能提高。     

Enhancing silica dispersion and interfacial interaction in styrene butadiene/silica rubber composites by using epoxidized styrene butadiene rubber as interfacial compatibilizer

It is usually desired but often challenging to improve the wet traction, and reduce the abrasion and rolling resistance simultaneously in tread rubber, which is referred to as “magic triangle” in tire industry. To fulfill this goal, the filler dispersion and interfacial interaction required to be improved, as they are two essential factors to concurrently govern the ultimate properties of rubber composites. Herein, we synthesized the epoxidized solution polymerized styrene butadiene rubber (ESSBR) with different epoxy level, and used them as interfacial compatibilizer to promote the silica dispersion and silica/rubber interfacial interaction. The epoxy of ESSBR would react with silanol on silica surface and co-crosslink with SSBR simultaneously, therefore build a strong bridge between rubber matrix and filler. By incorporation of 20 phr of ESSBR-15% (15% of double bonds on main chain was epoxidized), the wet grip was improved by 40%, and DIN abrasion and rolling resistance were reduced by 38% and 21%, respectively with hardly sacrifice the mechanical properties. We envisage that this study provides an approach for the fabrication of rubber composites with improved silica dispersion and strengthened interfacial interaction.     

SIBR生胶门尼粘度对胶料性能的影响

研究不同门尼粘度的集成橡胶(SIBR)混炼胶和硫化胶的各项性能,并与溶聚丁苯橡胶(SSBR1204)进行对比.结果表明,适当提高SIBR生胶的门尼粘度,可以在不影响胶料加工性能的前提下,提高混炼胶强度,同时硫化胶的物理性能和动态力学性能也普遍得到改善.高门尼粘度的SIBR综合性能较理想,与SSBR1204相比并无显著差异.