电子辐射预硫化对填充胶料性能的影响

通过考察填充不同用量炭黑N220的天然橡胶的填料-填料相互作用,研究电子辐射预硫化胶料性能的变化。结果表明,电子辐射预硫化后,胶料的门尼粘度提高,硫化胶的基本物理性能无显著变化,但Payne效应和滞后损失大幅下降,可有效提升填充胶料的动态性能,且随炭黑用量增大,提升效果更明显。     

相对分子质量及其分布对高反式1，4-丁二烯-异戊二烯共聚橡胶性能的影响

研究相对分子质量(门尼粘度)及其分布对反式1,4-丁二烯-异戊二烯共聚橡胶(TBIR)性能的影响。结果表明,TBIR的塑炼、混炼性能随着门尼粘度的减小逐渐改善,门尼粘度大于60的TBIR混炼难度增大、加工性能变差;TBIR的综合物理性能随着门尼粘度的增大而提高,但当门尼粘度大于55之后胶料物理性能和动态性能改善效果不显著,TBIR胶料综合性能在门尼粘度为50～60时达到最佳。相对分子质量分布呈双峰的TBIR生胶和硫化胶的强伸性能、磨耗性能和生热性能较优;相对分子质量分布呈单峰的TBIR硫化胶耐屈挠性能得到很大提高。     

乙烯含量对三元乙丙橡胶性能的影响

研究乙烯含量对三元乙丙橡胶(EPDM)性能的影响。结果表明:乙烯含量对EPMD胶料的门尼粘度和硫化特性无明显影响;随着乙烯含量的增大,EPDM硫化胶的硬度、拉伸强度、撕裂强度和回弹值总体呈增大趋势,低温性能变差。     

硅烷偶联剂Si69与活性剂PEG4000协同作用改性白炭黑的研究

以全钢载重子午线轮胎用高白炭黑含量胶料配方为基体,研究硅烷偶联剂Si69与活性剂PEG4000协同作用改性白炭黑对胶料性能的影响。结果表明：硅烷偶联剂Si69和活性剂PEG4000对提高白炭黑分散效果不存在协同作用;对降低胶料的门尼粘度、延长t₁₀及提高硫化胶的抗硫化返原率、硬度、定伸应力和降低生热方面存在明显的协同作用;硅烷偶联剂Si69用量为5.2份、活性剂PEG4000用量为3份时,胶料的门尼粘度和硫化胶的生热最低,硫化胶的定伸应力、拉伸强度和拉断伸长率均较高,综合性能较佳。     

天然橡胶中蛋白质含量对其白炭黑填充胶料性能的影响

研究天然橡胶（NR）中蛋白质含量对其白炭黑填充胶料性能的影响。结果表明：在未加硅烷偶联剂Si69的胶料中,随着NR中蛋白质含量的增大,胶料的门尼粘度、FL和Fmax增大;与未加硅烷偶联剂Si69的胶料相比,加入硅烷偶联剂Si69的胶料的白炭黑分散性提高,门尼粘度、FL和Fmax减小,t10和t90明显延长;硫化胶的物理性能提高,滚动阻力降低。     

热塑性苯酚甲醛树脂的相对分子质量和游离酚含量对胶料加工性能的影响

分别制备不同相对分子质量和游离酚含量的热塑性苯酚甲醛树脂,并测试添加这些树脂的天然橡胶(NR)的加工性能。结果表明:热塑性苯酚甲醛树脂的相对分子质量对胶料的焦烧时间和门尼粘度有一定影响,树脂的相对分子质量增大,胶料的焦烧时间趋于延长,门尼粘度有增大趋势;热塑性苯酚甲醛树脂中游离酚含量对胶料硫化时间和门尼粘度有影响,树脂中游离酚含量增加,胶料的硫化时间趋于缩短,门尼粘度有减小趋势。     

白炭黑填充天然橡胶胶料的混炼工艺优化

研究白炭黑填充天然橡胶胶料中加料顺序对硅烷化反应及胶料性能的影响。结果表明：与防老剂和活化剂在一段混炼时加入相比,防老剂和活化剂在二或三段混炼时加入,白炭黑与硅烷偶联剂的反应更彻底,胶料的门尼粘度降低,门尼焦烧时间延长,Payne效应减弱,结合胶含量增大;硫化胶的300%定伸应力、拉伸强度、撕裂强度和耐磨性能提高,60 ℃时的损耗因子减小。     

天然橡胶的门尼粘度和塑性保持率对全钢载重子午线轮胎胎体胶性能的影响

研究天然橡胶（NR）的门尼粘度和塑性保持率（PRI）对全钢载重子午线轮胎胎体胶性能的影响。结果表明：NR的门尼粘度和PRI越小,则生胶的重均相对分子质量越大,相对分子质量分布越宽;胶料的门尼粘度减小,门尼焦烧时间延长,硫化速度减慢;硫化胶的拉伸强度和拉断伸长率减小,生热增大,耐热老化性能下降,炭黑分散性变化不大。     

天然橡胶的相对分子质量对全钢载重子午线轮胎胎体胶性能的影响及其快速表征方法评价

研究天然橡胶（NR）的相对分子质量对全钢载重子午线轮胎胎体胶性能的影响,并使用不同方法对NR的相对分子质量进行表征。结果表明：NR的相对分子质量与胶料的门尼粘度呈正相关性,与胶料的门尼焦烧时间和自粘性呈负相关性;RSS3硫化胶的综合物理性能最优,10^#标准胶硫化胶的综合物理性能最差;在一定区间内的NR相对分子质量与硫化胶的H抽出力呈强相关性;NR的塑性初值和门尼粘度只能粗略地表征NR的相对分子质量,复数粘度可以有效地表征NR的相对分子质量。     

电子束辐照预硫化工艺对全钢子午线轮胎过渡层胶性能的影响

研究电子束辐照预硫化工艺对全钢子午线轮胎过渡层胶性能的影响。结果表明,全钢子午线轮胎过渡层胶片经电子束辐照后,生胶强力和门尼粘度均有不同程度的提高,胶料的硫化速度和硫化胶的力学性能及胶片剥离力基本不变,钢丝抽出力有一定程度的下降,成品轮胎的过渡层渗胶情况得到改善。     

Properties of vulcanizates from blends of natural rubber and thioglycolic acid modified,epoxidized, low‐molecular‐weight natural rubber filled with carbonized rubber seed shell

Vulcanizates from blends of natural rubber and thioglycolic acid modified, epoxidized, low‐molecular‐weight natural rubber filled with mixtures of carbon black and carbonized rubber seed shell, with semiefficient sulfur vulcanization recipes, were critically investigated and characterized. The investigated properties were the processing and rheological properties (the cure rate, cure time, scorch time, total oscillating disc rheometry torque, and Mooney viscosity), physicomechanical and chemical properties, solvent resistance, solubility, and swelling properties. On the basis of the investigated properties, it was observed that the carbonized rubber seed shell acted as a plasticizer and not as a reinforcing filler such as carbon black. The replacement of carbon black with up to 20% carbonized rubber seed shell produced vulcanizates having processing advantages in time gain and energy consumption, with their physical, chemical, and mechanical properties around the acceptable level for natural rubber compounds but lower than the properties obtained for a 100% carbon black filled vulcanizate. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

应用橡胶加工分析仪研究胶料中炭黑聚集情况

应用RPA2000橡胶加工分析仪测试炭黑胶料在一定条件下弹性模量的变化,研究炭黑聚集的过程。结果表明,在没有硫化体系或胶料交联前,炭黑的聚集速度很快,而且是一个持续过程,炭黑的聚集速度随着温度的升高而加快。对于终炼胶,炭黑的聚集在硫化交联之前已经开始;在相同的硫化程度下,低温硫化胶料的Payne效应较高,炭黑聚集程度较大;胶料的门尼粘度越高,炭黑的聚集速度越慢,聚集程度越小。     

均匀剂在NR/CIIR共混胶中的应用

研究了均匀剂HY-2010在天然橡胶/氯化丁基胶（NR/CIIR）共混胶中的应用,并与均匀剂40MSF进行了对比试验。试验结果表明,使用均匀剂HY-2010和40MSF,均可以降低胶料的门尼粘度,提高胶料的均匀性,降低混炼能耗,延长焦烧时间和硫化时间,改善炭黑的分散性,对硫化胶料的物理性能影响不大。     

An investigation on the reinforcing potential of red earth as filler for natural rubber compounds

Locally sourced red earth (RE) was air‐dried, pulverized, and screened with a sieve of mesh size 75 nm. It was characterized in terms of its moisture content, loss on ignition, silica content, iodine adsorption number, oil absorption, pH, and metal oxide compositions. Natural rubber, standard Nigerian rubber used for this work was first characterized in terms of its dirt, ash and nitrogen contents, volatile matter, plasticity retention index, and Mooney viscosity. The RE was applied as filler wholly and in blends with standard carbon black, CB (N330) filler in the natural rubber compounding using efficient vulcanization system. The cure and the physicomechanical properties of the compounds and vulcanizates were, respectively, measured as function of filler loading. The results were compared with those of the standard carbon black (N330)‐filled natural rubber. It was found, that the RE‐filled natural rubber showed substantial reinforcement of the rubber, though inferior to carbon black (N330) filled vulcanizates, the tensile strength of the carbon black‐filled vulcanizates is about one half times that of the RE‐filled vulcanizates. The tensile properties of the RE‐filled vulcanizates improved markedly by blending the RE‐filler with the carbon black (N330). © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Experimental analysis of viscoelastic properties in carbon black‐filled natural rubber compounds

Processability and viscoelastic properties of natural rubber (NR) compounds filled with different carbon black loadings and types were investigated with the use of a steady shear rheometer, namely, the Mooney viscometer, and an oscillatory rheometer, namely, the Rubber Process Analyser (RPA2000). It was found that the type and amount of carbon black strongly influence the viscoelastic properties of rubber compounds. Both the dilution effect and filler transient network are responsible for the viscoelastic properties, depending on the vulcanization state. In the case of uncured compounds, the damping factor of the uncured NR decreases with increasing black loading. This is attributed to the reduction of mobilized rubber content in the compound (or the dilution effect). However, in the case of the cured NR vulcanizates, the filler transient network is the dominant factor governing the damping factor of the vulcanizate. With increasing black loading, the damping factor of the vulcanizate clearly increases. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 2197–2203, 2005     

Effect of filler–filler interaction on rheological behaviour of natural rubber compounds filled with both carbon black and silica

Rubber compounds are reinforced with fillers such as carbon black and silica. In general, filled rubber compounds show smooth rheological behaviour in measurement of Mooney viscosity or Mooney scorch time. Variation in rheological behaviour was studied in terms of the filler composition using natural rubber compounds filled with both carbon black and silica (carbon black/silica = 60/20,40/40, and 20/60 phr). The compound filled with carbon black/silica of 60/20 phr showed normal rheological behaviour. However, the compounds filled with carbon black/silica of 40/40 and 20/60 phr showed abnormal rheological behaviour, in which the viscosity increased suddenly and then decreased at a certain point during the measurement. The abnormal behaviour was explained by the strong filler–filler interaction of silica. Moreover, the abnormal rheological behaviour was displayed more clearly as the storage time of compounds is increased. © 2003 Society of Chemical Industry     

炭黑用量对不同结构聚丁二烯橡胶流变行为的影响

研究了BR9000，BR9002,BR3505等3种不同结构的聚丁二烯橡胶／炭黑混炼胶的门尼粘度和毛细管流变行为。结果表明，增加炭黑用量能够显著提高3种聚丁二烯橡胶混炼胶的门尼粘度、流动屈服应力和表观剪切粘度。与BR9000相比，聚丁二烯橡胶的反式结构含量较高时（BR3505），混炼胶门尼粘度较大，但表观剪切粘度反而较低;相对分子质量分布较宽时（BR9002）,门尼粘度和表观剪切粘度较低。     

钴系BR在轮胎胎侧胶中的应用

对比研究炭黑和炭黑/白炭黑填充钴系BR0150/NR与炭黑填充镍系BR9000/NR在轮胎胎侧胶中的应用。结果表明:与炭黑填充BR9000/NR胶料相比,炭黑填充BR0150胶料的门尼粘度较小,流动性较好,正硫化时间和焦烧时间相近,硫化胶的各项性能相差不大;炭黑/白炭黑填充BR0150/NR胶料门尼粘度较大,正硫化时间延长,硫化胶的物理性能和老化性能相差不大,但撕裂强度大幅增大,抗切割性能和耐屈挠割口增长性能改善。     

炭黑并用对NR／ENR共混胶力学性能及减震性能的影响

对比N660研究了N330／N660、N660／N990炭黑填充体系对天然橡胶（NR）／环氧化天然橡胶（ENR）共混胶力学性能、压缩疲劳生热性能及减震性能的影响,并采用橡胶加工分析仪（RPA）对其加工性能进行了分析。结果表明：N660／N330和N660／N990两种填充体系硫化胶的力学性能,基本上是单用一种炭黑所得硫化胶力学性能的加权平均;不同粒径炭黑并用均能使共混胶的贮能模量E′下降,并且有利于拓宽NR／ENR减震材料的减震范围;不同粒径炭黑并用有利于改善NR／ENR共混胶料的加工性能。     

Effect of bound rubber on characteristics of highly filled styrene–butadiene rubber compounds with different types of carbon black

Viscosity and cure time of a filled rubber compound having an accelerated sulfur cure system are affected by types and contents of the rubber and the filler as well as of the curatives. Bound rubber content is used as level of the reinforcement. Influence of bound rubber on viscosity and cure time of a rubber compound was studied using highly filled styrene–butadiene rubber compounds with carbon black having different structures. The bound rubber content increases with increase of the carbon black content and also increases as the carbon black structure is developed. The Mooney viscosity increases linearly with increase of the bound rubber content irrespective of the carbon black structure when the primary particle size of carbon black is nearly the same. The Mooney scorch time decreases linearly with increase of the bound rubber content irrespective of the carbon black structure. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 1001–1006, 2004