妥尔油改性酚醛树脂SL2101在丁腈橡胶中的应用

研究妥尔油改性酚醛树脂SL2101用量对丁腈橡胶（NBR）胶料性能的影响。结果表明：随着酚醛树脂SL2101用量的增大,NBR胶料的门尼粘度减小,门尼焦烧时间缩短,t90延长,硫化速度减慢,交联密度增大,硫化胶的邵尔A型硬度和定伸应力增大,拉断伸长率减小;添加少量的酚醛树脂SL2101有助于提高胶料的耐热氧老化性能。     

门尼黏度对反式-1,4-聚异戊二烯及其并用胶性能的影响

研究了门尼黏度对反式-1,4-聚异戊二烯(TPI)及丁苯橡胶(SBR)／TPI并用胶性能的影响。结果表明,TPI生胶的邵尔A型硬度随其门尼黏度的增大而增大,当门尼黏度为70左右时,TPI生胶的拉伸强度、扯断伸长率、100％定伸应力、撕裂强度及结晶度出现最大值;随着TPI门尼黏度的增大,其硫化胶的力学性能提高,Goodrich压缩生热减小,撕裂强度在门尼黏度为90左右时存在最大值,TPI的最佳门尼黏度为50～100：TPI硫化胶的热氧老化以断链反应为主,门尼黏度越高,混炼难度越大,同时硫化胶的耐老化性能越差。TPI的门尼黏度越高,SBR／TPI并用胶60℃的损耗因子越低,0℃的损耗因子基本不变,其硫化胶的力学性能较好,但混炼困难,TPI适宜的门尼黏度为50～100。     

氯丁橡胶/三元乙丙橡胶共混胶的混炼工艺性能

考察了不同共混比的氯丁橡胶(CR)/三元乙丙橡胶(EPDM)共混胶料随温度变化的门尼黏度和开炼机混炼特性,并用橡胶加工分析仪研究了不同温度下CR/EPDM共混胶料的黏弹性。结果表明,在60~90℃时,胶料的门尼黏度随温度升高而降低,其中纯CR胶料的下降趋势比纯EPDM和CR/EPDM胶料更为迅速;随着EPDM并用量的增加,CR/EPDM共混胶料的门尼黏度随着温度的升高而降低的趋势减缓;当CR/EPDM为80/20、辊温在75℃以下时,共混胶料处于正常的弹性状态,有利于进行混炼薄通操作;在相同温度下,CR/EPDM共混胶料的弹性模量和弹性黏度随着EPDM并用量的增加而增大;随着EPDM并用量的增加,CR/EPDM共混胶加工性能的改善程度更明显。     

调节剂丁对热法丁腈橡胶合成与性能的影响

用十二烷基苯磺酸钠替换拉开粉后,在其他工艺条件不变的情况下,考察了调节剂丁的用量及加入方式对热法丁腈橡胶( NBR) 合成及性能的影响。结果表明,调节剂丁1 次加入时,随着调节剂丁用量的增加,聚合时间延长,NBR 的凝胶含量、门尼黏度及数均分子量逐渐降低,分子结构未发生明显变化;当调节剂丁分3 次加入时,NBR 的门尼黏度、凝胶含量及数均分子量相对于1 次加入均有所降低,并且随着调节剂丁用量的增加,NBR 硫化胶的拉伸强度和300%定伸应力下降,扯断伸长率提高; 调节剂丁适宜总用量为0. 34 ～ 0. 36 份。     

大豆油对丁腈橡胶增塑作用的研究

以环保大豆油用作丁腈橡胶(NBR)增塑剂,研究其用量对NBR胶料门尼粘度、流变性能和物理性能的影响,并与增塑剂261进行对比。结果表明:与增塑剂261增塑NBR胶料相比,大豆油增塑NBR胶料的门尼粘度和表观粘度较小,增塑效果和加工性能较好;当增塑剂用量为5份时,大豆油增塑NBR硫化胶的拉伸强度和拉断伸长率较大;但随着增塑剂用量的增大,大豆油增塑NBR硫化胶的物理性能变差。     

用热重分析法研究炭黑分解温度

利用热重(TG)分析法研究炭黑分解温度。结果表明:在相同升温速率下,炭黑粒径越大,炭黑外延起始分解温度越高;对于同一炭黑,升温速率越快,炭黑外延起始分解温度越高。在NBR/炭黑胶料中,随着NBR丙烯腈含量增大,炭黑外延起始分解温度呈降低趋势;随着炭黑用量增大,炭黑外延起始分解温度呈升高趋势,但炭黑用量超过一定值后,炭黑外延起始分解温度基本稳定。在NBR/炭黑/其他配合剂胶料中,炭黑外延起始分解温度受其他配合剂的影响较大。     

储存时间对丁腈橡胶性能的影响

研究储存时间对丁腈橡胶(NBR)性能的影响。结果表明:随着NBR储存时间的延长,其生胶的门尼粘度降低,凝胶含量增大,胶料的硬度、撕裂强度和耐油性能变化不大;NBR储存时间超过2年后,其生胶的凝胶含量迅速增大,胶料的焦烧时间缩短,拉伸强度和拉断伸长率大幅降低,耐低温性能略有降低。NBR的储存时间不宜超过2年。     

石墨烯在6~35kV乙丙绝缘橡胶电缆可剥离外屏蔽材料中的应用

研究了不同组分和不同预分散方法下,石墨烯对电压等级6~35 kV乙丙绝缘橡胶电缆可剥离外屏蔽料电性能、物理性能以及加工性能的影响。结果表明,在EVM/NBR屏蔽料中加入石墨烯,胶料的导电性能、门尼黏度和剥离性能最佳。石墨烯的混炼采用常规工艺即可。     

VMA1000胶料流动性分析仪在橡胶加工中的应用

针对目前橡胶行业普遍运用门尼黏度表征胶料加工流动性的现状,阐述了门尼黏度与流动性的不同以及产生流动性差异的原因。重点运用新型VMA1000胶料流动性分析仪,对实际胶料生产进行检测与质量控制,分析了影响胶料加工流动性的因素和流动性对橡胶加工的重要意义。     

流动分散剂RL22和WB222在NBR中的应用研究

对比研究了流动分散剂RL22、WB222与邻苯二甲酸二辛酯(DOP)对丁腈橡胶(NBR)的流变性能、门尼松弛、门尼焦烧、硫化特性、物理机械性能以及压缩永久变形的影响。结果表明,均为饱和脂肪酸酯的RL22、WB222对NBR胶料具有优良的润滑和填料分散效果,胶料的加工性能优于DOP;两者对胶料的硫化性能、力学性能和老化性能无明显影响。     

NBR薄型曲面海绵成型技术的研究

研究低门尼粘度、非污染型丁腈橡胶在薄型曲面海绵胶料中的应用。通过不同的配方设计,提高了胶料的耐热性能和工艺性能,同时赋予胶料较高的发泡活性和较低的视密度,达到了设计要求。     

环保增塑剂在丁腈橡胶中的应用

系统研究环保增塑剂TP-95,TP-90B,BXA-R,TOTM和DOTP对丁腈橡胶(NBR)综合性能的影响,并与常用的增塑剂DBP进行对比。结果显示:与增塑剂DBP相比,添加增塑剂TP-95和TP-90B的混炼胶的门尼粘度低,增塑效果最佳,耐低温性能优良;添加增塑剂TOTM的硫化胶的耐热性优良,压缩永久变形和热老化后物理性能变化率较小;添加增塑剂BXA-R的硫化胶的综合性能最佳,既具有良好的耐热性能,又具有较好的耐低温和耐油性能。     

丁腈橡胶/疏松型纳米氢氧化镁复合材料的性能

用气泡液膜法(GBLM)制备的疏松型纳米氢氧化镁(LN-MH)填充丁腈橡胶(NBR),研究了复合材料的阻燃性能、力学性能、抽提率、门尼黏度及交联密度。结果表明,随着LN-MH用量的增加,LN-MH对NBR具有显著的纳米增强作用,改善了复合材料的阻燃性能、力学性能、门尼黏度和交联密度,但对复合材料在甲苯中的抽提率无影响。     

Effects of trans-polyoctenylene on the mechanical properties of NBR

Trans-polyoctenylene (TOR), a high-polymer polymerization product of cyclooctene, has found use as a processing aid in high-viscosity rubber stocks. We have compared some physical and mechanical properties of a NBR-compound with TOR with those of the same compound without TOR. Mooney viscosity was lower for the compound with TOR. Cylinders with a height and diameter of 20 mm were molded. It was found that stress–relaxation measured in the common static way was almost the same for the two compounds. Dynamic stress–relaxation occurred much more rapidly for the compound with TOR. The compound with TOR increased in hardness more rapidly when aged in air, and showed a higher swelling in oil. The DSC results imply that TOR is incorporated as a separate phase in the parent rubber. The sealing properties are affected detrimentally when TOR is used as a processing aid in NBR.     

温度对乳聚丁腈橡胶聚合的影响

采用中国石油兰州石化公司生产的丁腈橡胶N41乳液聚合配方,考察了不同聚合温度对反应时间的影响,测定了橡胶链化学结构组成、胶乳粒径、乳液机械稳定性和生胶门尼黏度等性能。结果表明:随着聚合温度的升高,反应时间缩短,丁腈橡胶链结构组成变化不明显。反应后期聚合温度的升高,导致胶乳粒径增大,机械稳定性降低,生胶门尼黏度升高。     

Properties influenced by addition of copoly (ethylene/octene) in BR–NBR blends

Abstract

The effects of copoly (ethylene/octene) (EOM) on rheological, mechanical, and cure properties and on carbon black distribution in each phase of butadiene rubber–nitrile/butadiene rubber (BR–NBR) blends have been investigated. It was found that EOM added to the blends is able to function as a plasticising agent for BR and NBR, and the plasticising efficiency of EOM is more significant in NBR than BR. With increasing EOM content, the deviation of Mooney viscosity from the additive line (interpolated values) reduces markedly. In pure components (i.e. 100 : 0 and 0 : 100), cure rate reduces and cure time increases with addition of EOM. In contrast in the blend systems, cure rate increases and cure time decreases when EOM is added. The distribution of carbon black in each phase of the blends is strongly controlled by the viscosity of each phase in the blend. The lower the phase viscosity, the greater the residual carbon black. Accordingly, dynamic mechanical thermal analysis reveals a slight shift in the glass transition temperature of the BR phase to higher temperature, compared with the NBR phase, as EOM is added. From the results obtained, it is proposed that EOM exists in the interfacial area between the two phases. However, at higher amounts of EOM, saturation of EOM at the interfacial area occurs and the excess EOM starts to migrate to the BR phase. Further increase in EOM concentration leads to saturation of EOM in the BR phase and EOM then migrates to the NBR phase.     

贮存烟胶片加工性能研究

采用红外光谱、门尼粘度测定、橡胶加工分析等技术分析了长期自然贮存烟胶片的结构和加工操作性能,测定了硫化胶老化前后的力学性能.长期贮存后,烟胶片的分子链之间发生交联和氧化降解,导致门尼粘度、凝胶含量上升,加工操作性能下降,并且老化前后力学性能显著下降.     

Properties of silica‐filled styrene‐butadiene rubber compounds containing acrylonitrile‐butadiene rubber: The influence of the acrylonitrile‐butadiene rubber type

Because silica has strong filler‐filler interactions and adsorbs polar materials, a silica‐filled rubber compound exhibits poor dispersion of the filler and poor cure characteristics in comparison with those of a carbon black‐filled rubber compound. Acrylonitrile‐butadiene rubber (NBR) improves filler dispersion in silica‐filled styrene‐butadiene rubber (SBR) compounds. The influence of the NBR type on the properties of silica‐filled SBR compounds containing NBR was studied with NBRs of various acrylonitrile contents. The composition of the bound rubber was different from that of the compounded rubber. The NBR content of the bound rubber was higher than that of the compounded rubber; this became clearer for NBR with a higher acrylonitrile content. The Mooney scorch time and cure rate became faster as the acrylonitrile content in NBR increased. The modulus increased with an increase in the acrylonitrile content of NBR because the crosslink density increased. The experimental results could be explained by interactions of the nitrile group of NBR with silica. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 385–393, 2002     

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.     

Study of the miscibility and mechanical properties of NBR/HNBR blends

In this study, hydrogenated acrylonitrile butadiene rubber (HNBR, ZETPOL‐2010L) and nitrile butadiene rubber (NBR, NIPOL‐DN4555) were blended at different ratios in a Haake melt blender at 130°C. The HNBR and the NBR were of very similar acrylonitrile content and Mooney viscosity. The melt miscibility and solid‐state properties were investigated by rheological, thermal, and mechanical testing and scanning electron microscopy (SEM) techniques. The dynamic viscosity of the blends followed the log‐additivity rule, while the flow activation energy closely followed the inverse additivity rule. On the other hand, the storage modulus showed synergistic effects at all compositions, suggesting the presence of emulsion morphology at both ends of the composition range. For the 50/50 HNBR/NBR blend, the SEM micrographs suggest a uniform elongated structure. The thermal analysis showed the presence of two glass transitions, representing the pure components, at all blend ratios, suggesting the absence of segmental miscibility of the blends. The small‐strain mechanical properties such as tensile modulus and yield stress followed linear additivity. However, HNBR and HNBR‐rich blends were observed to strain harden at a rate higher than that of NBR. Induced crystallization of HNBR was suggested to be the reason for the strain hardening. The different rheological, thermal, and mechanical testing techniques agree in suggesting that the structurally similar HNBR and NBR are not thermodynamically miscible but mechanically compatible. Polym. Eng. Sci. 44:2346–2352, 2004. © 2004 Society of Plastics Engineers.