多功能助剂PA在输送带中的应用

介绍了一种兼有分散剂、活化剂、硫化促进剂、内润滑剂及脱模剂功能的多功能助剂PA在输送带胶料中的应用.在输送带覆盖胶配方中添加此种助剂,可适当减小原生产配方中氧化锌、硬脂酸及硫化促进剂的用量,有效地提高了胶料的力学性能,改善了胶料的加工性能,并使成品的表面光泽度提高,使用寿命延长,胶料成本降低58元@t-1,脱模剂用量节约75%.     

多功能助剂PA在农业轮胎中的应用

多功能助剂ＰＡ具有分散剂,活化剂,硫化促进剂,内润滑剂及脱模剂的功能。胶料配方中添加此种助剂可适当减小原生产配方中的氧化锌,硬脂酸及硫化促进剂的用量,不但可以降低原料成本,而且可以改善胶料的加工性能,提高硫化胶的力学性能及橡胶制品的外观合格率。多功能助剂的ＰＡ应用于拖拉机轮胎中,每千克原材料可降低成本０．１４元,轮胎使用寿命提高１４％左右。     

加工助剂HT-K的使用及对氧化锌减量的作用

试验研究加工助剂HT-K在氧化锌减量中的作用效果。结果表明,通过减小氧化锌用量并配用2份加工助剂HT-K,再适当调整硬脂酸和炭黑N234用量,可改善胶料的加工性能,提高硫化胶的抗高温硫化返原性和耐磨性能,改善生热性能,对成品轮胎的耐久性能影响不大。     

混炼工艺对白炭黑填充SSBR/BR性能的影响

研究了混炼工艺对偶联剂Si69改性白炭黑填充的溶聚丁苯橡胶/顺丁橡胶(SSBR/BR)并用胶物理机械性能的影响。结果表明,分别加入硬脂酸和促进剂DPG对焦烧时间、正硫化时间及物理机械性能的影响不大;加入ZnO可明显缩短焦烧时间和正硫化时间,并略微降低物理机械性能,压缩疲劳温升和压缩永久变形均明显降低;分别加入硬脂酸、促进剂DPG和ZnO均使混炼胶的G0′-G∞′值略有变小,但加入促进剂DPG可使硫化胶的G0′-G∞′值明显降低,损耗因子tanδ变小,说明促进剂DPG可明显加快白炭黑和Si69间的硅烷化反应,体系Payne效应降低,综合物理机械性能最好。     

配方因素对高硬度橡胶动态屈挠性能的影响

文中研究了配方因素对较高硬度(邵尔A80)橡胶动态屈挠性能的影响。实验选用天然橡胶和顺丁橡胶的并用胶,研究了橡胶并用的比例、硫磺和促进剂的用量、氧化锌的用量、防老剂的用量对硫化橡胶性能,尤其是硬度和动态屈挠性能的影响。结果表明,天然橡胶和顺丁橡胶的并用比为40/60时能提供必要的强度和弹性,硫化胶的动态屈挠性能较好。硫化体系以普通硫磺硫化体系为基础,通过提高硫化剂和促进剂的用量,可以在增加硫化胶硬度的同时,改善硫化胶的耐屈挠性能。适量的氧化锌在提高硫化胶硬度的同时,可满足动态屈挠性能的要求。使用对苯二胺类防老剂4010NA可以显著提高硫化胶的动态疲劳性能。     

环保硫化体系对天然胶乳硫化及其性能的影响

以浓缩天然胶乳为原料,采用非亚硝胺型(ZBEC)、低亚硝胺型(ZDBC)传统型(ZDC)硫化促进剂分别加入天然胶乳中制备配合胶乳及硫化胶膜。考察硫化促进剂的种类和用量、氧化锌的用量、硫磺的用量及制品加工温度对天然胶乳的硫化性能与硫化胶膜物理机械性能的影响。试验结果表明:适当增加氧化锌用量,可明显提高天然胶乳硫化胶膜的交联密度和撕裂强度;适当增加硫化促进剂或硫磺的用量,不仅可以加快胶膜的硫化速度,同时也可以有效的增大硫化胶膜的交联密度,从而提高硫化胶膜的物理机械性能;天然胶乳胶膜的硫化温度控制在100℃左右,具有较大的交联密度和较好的物理机械性能;从天然胶乳胶膜的硫化速度和硫化胶膜的物理机械性能方面考虑,采用环保硫化促进剂ZBEC、ZDBC代替传统的硫化促进剂ZDC是可行的。     

用常温塑化法再生氯化丁基橡胶

研究了硫化促进剂种类、硫黄及硬脂酸用量对氯化丁基橡胶再生胶物理机械性能的影响.结果表明,单独使用促进剂CZ时硫化再生胶的综合性能较好,拉伸强度达到6.1 MPa,扯断伸长率达到679%,焦烧安全性良好.硫化再生胶的最大转矩随着硫黄用量的增加而增大,胶料的硫化平坦性较好,无硫化返原现象.当硫黄用量为0.5份(质量)时,硫化再生胶拉伸强度最高;超过1.5份(质量)后出现喷霜现象.硬脂酸的使用会对硫化再生胶的物理机械性能产生负面影响.     

双金属稀土促进剂对丁苯橡胶/天然橡胶胎面胶的影响

通过配位反应制备得到双金属硫化促进剂二乙基二硫代氨基甲酸锌镧配合物(ZnLaDC),在不添加传统活化体系氧化锌(ZnO)/硬脂酸(SA)的情况下,考察了ZnLaDC用量对丁苯橡胶(SBR)/天然橡胶(NR)胎面胶复合材料硫化特性及物理机械性能的影响,并与传统硫化体系二乙基二硫代氨基甲酸锌(ZnDC)/ZnO/SA制备的硫化胶性能进行了对比。结果表明,随着ZnLaDC用量的增加,SBR/NR胎面胶复合材料的硫化特性、压缩疲劳生热性能及耐磨性得到有效提高,当ZnLaDC用量为5份时,复合材料的综合性能最佳。与传统硫化体系ZnDC/ZnO/SA制备的硫化胶相比,采用ZnLaDC制备的硫化胶具有更优异的静态力学性能及耐切割性。     

含硫化锌和噻唑类促进剂的氯化丁基胶料及其硫化胶

用金属硫化物（如硫化锌和硫化钡）、噻唑类促进剂及高活性炭黑制得的氯化丁基胶料、硫化胶及其制品,其工艺性能、综合物理机械性能、耐热老化性能及耐腐蚀介质性能都比用氧化锌、促进剂制得的常用氯化丁基胶料及硫化胶的性能好。制品使用寿命也比后者长几倍。     

正交设计法优化国产溴化丁基橡胶防焦体系

采用氧化锌/硫黄并用硫化体系,利用正交设计法优化了对焦烧安全性能影响较大的助剂轻质氧化镁、防焦剂CTP、均匀剂40MS、酚醛树脂SP1068和硬脂酸等的用量,并进行了门尼粘度、硫化特性和物理机械性能的方差实验。结果表明,当轻质氧化镁0.5份、均匀剂40MS 5份、硬脂酸0.5份、酚醛树脂SP1068 2份和防焦剂CTP 0.3份时,得到的国产溴化丁基橡胶(BIIR)胶料具有适宜硫化速度、焦烧时间和物理机械性能。     

基于BP神经网络优化制备化学改性脱硫灰/丁苯橡胶复合材料

以化学改性脱硫灰取代部分炭黑与丁苯橡胶复合制备化学改性脱硫灰/丁苯橡胶复合材料,运用均匀设计结合BP神经网络建立制备工艺参数与力学性能的BP神经网络优化模型,获得制备最优化学改性脱硫灰/丁苯橡胶复合材料的工艺参数,对最优复合材料进行了表征. 结果表明,最优化学改性脱硫灰/丁苯橡胶复合材料的制备参数为促进剂N-叔丁基-2-苯并噻唑次磺酰胺用量1.2 g、硫磺用量1.3 g、硬脂酸用量1.1 g、氧化锌用量2.4 g、硫化时间27 min,该条件下所制复合材料的拉伸强度为20.31 MPa、撕裂强度为45.68 kN/m、邵氏A硬度为66,最优实测值与最优模型预测值吻合较好,相对误差为3.03%~3.22%.     

不同粒径氧化锌填充丁腈橡胶的摩擦磨损机制

采用机械共混与热模压工艺制备普通氧化锌(c-ZnO)与纳米氧化锌(n-ZnO)填充丁腈橡胶(NBR)复合材料,并对复合材料的硫化特性、力学性能及摩擦磨损性能进行了对比研究。结果表明,用量相同时,与c-ZnO相比,n-ZnO在硬脂酸与硫黄作用下形成较强硫化剂,可延长胶料的硫化时间,有利于提高胶料的加工安全性与流动性。与加入c-ZnO的胶料相比,n-ZnO/NBR复合材料的撕裂强度提高了11.0%,压缩永久变形减小17.3%,邵尔A硬度略微提高,且在干摩擦、油润滑条件下均表现出优异的耐摩擦磨损性能。c-ZnO/NBR复合材料的磨损机制为磨粒磨损和严重的黏着磨损,n-ZnO/NBR复合材料的磨损机制为磨粒磨损和少量的黏着磨损。     

Systematic investigation on the effect of crosslinking agent type and dosage on the performance of TPU/MVQ based thermoplastic vulcanizates

Dynamic vulcanized thermoplastic polyurethane (TPU)/methyl vinyl silicone rubber (MVQ) thermoplastic vulcanizates (TPVs) were prepared in torque rheometer. The influence of the type and amount of peroxide crosslinking agent on the mechanical properties, thermal stability, micromorphology and melt flowability was systematically investigated. The results showed that the mechanical properties of the TPVs vulcanized by 2,5-dimethyl-2,5-di (tert-butyl peroxy) hexane (DBPH) first increased and then decreased with increasing the peroxide amount, while for dicumyl peroxide (DCP) vulcanizing system the mechanical properties slowly increased. Besides, the comprehensive mechanical properties vulcanized by DBPH were better than those of DCP group. The results of the thermogravimetric analysis showed that the TPVs vulcanized by DBPH had better heat stability, corresponding to the excellent thermo-oxidative aging performance and the 38% increase in tensile strength after aging. In addition, the MVQ rubber particles showed better dispersing performance for DBPH vulcanizing system. The melt flow rate of the TPVs showed a linear relationship with increasing DBPH dosage and became worse after the amount of crosslinking agent exceeded 1.5 phr. By comprehensive comparison, the TPVs have better performance when use peroxide DBPH as the crosslinking agent and the dosage is 1.5 phr.     

氧化锌对集成橡胶SIBR2505硫化特性和力学性能的影响

通过对显微镜观察结果、硫化特性、拉伸性能和动态力学性能的表征,考察了氧化锌在集成橡胶中的混炼工艺以及提高氧化锌分散效果的几种方法.结果表明,增加氧化锌和硬脂酸的用量,高温混炼工艺能够改善未填充集成橡胶硫化胶的力学性能.活性氧化锌、纳米氧化锌和载体氧化锌在集成橡胶中的分散性及硫化胶力学性能优于普通氧化锌,其中纳米氧化锌胶...     

抗静电氧化锌晶须对热硫化硅橡胶性能的影响

研究了抗静电用氧化锌晶须对热硫化硅橡胶的硫化特性、力学性能及电性能的影响。结果表明：在硅橡胶硫化初期氧化锌晶须能加速硫化反应、在硫化后期延迟硫化反应，可提高其最低扭矩和最高扭矩；硫化胶的硬度增加，拉伸强度、扯断伸长率有所降低，表面电阻率和体积电阻率降低。     

纳米粒子在氯丁橡胶中的作用

采用硅烷偶联剂WD-40对纳米白炭黑进行改性处理,研究了经过表面改性的纳米白炭黑对氯丁橡胶的补强效果,同时研究了纳米氧化锌对纳米白炭黑补强氯丁橡胶物理机械性能的影响。结果表明,纳米白炭黑对氯丁橡胶具有较好的补强作用,氯丁橡胶的定伸强度、拉伸强度和撕裂强度均随白发黑用量的增加而增加。同普通氧化锌相比,用纳米氧化锌硫化的氯丁橡胶的物理机械性能亦得到了明显提高。     

Exploring the role of stearic acid in modified zinc aluminum layered double hydroxides and their acrylonitrile butadiene rubber nanocomposites

The proposed study attempted to explore the role of stearic acid modification on the properties of zinc‐aluminum based layered double hydroxides (LDH) and their composites with acrylonitrile butadiene rubber (NBR). Three distinctive LDH systems were adapted for such comparison; an unmodified LDH and two stearic acid modified LDH. The use of zinc oxide and stearic acid in the rubber formulation was avoided as the modified LDH would be able to deliver the necessary activators for the vulcanization process. Emphasis was predominantly given to reconnoiter the merits of stearic acid modification on the increase in interlayer distance of the LDH. X‐ray diffraction studies and transmission electron microscope morphological investigations of LDH powders indicated that modification with stearic acid increased the interlayer spacing which would favor the intercalation of NBR polymer chains into the layered space. However, stress–strain studies indicated better mechanical properties for composites with unmodified LDH. Composites with LDH showed higher crosslinking densities than conventionally sulfur cured control compounds using zinc oxide/stearic acid as activators. This was evident from equilibrium swelling method as well as statistical theory of rubber elasticity. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 41539.     

Preparation and Use of Nano Zinc Oxide in Neoprene Rubber

Zinc oxide (ZnO) of nanometer particle size was prepared by solid-state pyrolytic method. TEM, XRD, and surface area studies showed that the prepared zinc oxide had particle size in the range of 15–30 nm and surface area in the range of 12–30 m²/g. This nano zinc oxide was used as a curing agent in neoprene rubber. The optimum dosage of ZnO was found to be low compared to commercial ZnO. The cure characteristic and mechanical properties were compared with those containing conventional ZnO. It was found that a low dosage of zinc oxide was enough to give equivalent curing and mechanical properties compared to one containing a higher dosage (5 phr) of commercial zinc oxide in neoprene rubber.     

Ionic thermoplastic elastomer based on maleated epdm rubber. I. Effect of zinc stearate

Neutralization of maleated EPDM rubber by zinc oxide results in an ionic elastomer. The rate and extent of the neutralization reaction increase by addition of stearic acid. Although the rubber is not easy processable as such, incorporation of zinc stearate at a loading of 30 phr makes the rubber behave the rubber behave like a thermoplastic during high temperature (≥ 150°C) processing. Furthermore, zinc stearate causes improvement in the physical properties of the rubber under ambient conditions. It is believed that zinc stearate acts as a reinforcing filler under ambient conditions and as a plasticizer for the ionic domains at higher temperature (that is, above its melting point, 128°C). The conclusions are based on the results of dynamic mechanical, rheological, and infrared spectroscopic studies. © 1996 John Wiley & Sons, Inc.