氢化丁腈橡胶硫化胶的机械再生

以松香、古马隆和树脂1101为增黏软化型再生助剂,采用机械薄通法对氢化丁腈橡胶(HNBR)硫化胶进行再生,考察了再生助剂品种及用量对HNBR再生胶性能的影响。结果表明,当3种再生助剂用量相同时,添加树脂1101的HNBR再生胶的流动性较好,添加古马隆的HNBR再生胶的操作安全性较好,添加松香的HNBR再生胶的硫化效率较高,且物理机械性能较优; 松香和树脂1101的适宜用量为12~16份,古马隆的适宜用量约为16份; 添加不同再生助剂的HNBR再生胶经热空气老化后的拉伸强度均上升、扯断伸长率均下降,且随着再生助剂用量的增加,扯断伸长率下降程度增大,耐老化性能变差; 添加松香的HNBR再生胶的耐老化性能劣于添加古马隆和树脂1101的HNBR再生胶; 随着再生助剂用量的增加,添加古马隆和树脂1101的HNBR再生胶的耐油性能得到改善。     

810酯/古马隆树脂并用对氢化丁腈橡胶性能的影响

研究液体邻苯二甲酸正辛正癸酯（810酯）/固体古马隆树脂并用比对氢化丁腈橡胶（HNBR）性能的影响。结果表明：810酯的增塑效果比古马隆树脂好;随着810酯/古马隆树脂并用比（总用量12份）减小,胶料的焦烧时间变化不大,硫化速度加快,硬度、拉断伸长率和粘合性能提高,拉伸强度略有下降,定伸应力和耐热老化性能先提高后降低;810酯/古马隆树脂并用比为8/4时,胶料的综合性能较好。     

酚醛树脂/古马隆树脂对再生橡胶性能的影响

研究了204酚醛树脂(204树脂)和古马隆树脂在再生橡胶中的应用。测定了2种树脂对再生橡胶的交联密度、硫化特性、门尼粘度、力学性能、动态力学性能的影响。结果表明,2种树脂均可以有效地降低再生橡胶的门尼粘度;204树脂的固化作用可以提高硫化胶的整体交联密度,有利于再生橡胶力学性能的提高,当其用量为3phr时达到最佳效果;古马隆树脂有利于再生橡胶断裂伸长率的提高,当其用量为4.5phr时达到最佳效果。     

树脂种类及用量对EPDM性能的影响

研究了石油树脂(C5)、对-特辛基酚醛树脂(SL-1801)、对-叔丁基酚醛树脂(SL-T421)及古马隆树脂对EPDM胶料粘合强度、硫化特性、交联密度和力学性能等的影响。结果表明,4种树脂均能提高混炼胶粘合性能;其中,C5树脂/SL-1801树脂用量分别为10份/8份时,混炼胶粘合强度最大;加入4种树脂均能降低混炼胶硫化速率和硫化胶定伸应力,提高拉断伸长率。     

硫化体系对HNBR抗直角撕裂性能的影响

分别以DCP、DCP/硫黄配合物和DCP/TAIC配合物作硫化体系研究了氢化丁腈橡胶(HNBR)抗直角撕裂性能,并分析了抗直角撕裂性能随硫化体系变化的规律以及硫化剂用量与HNBR撕裂强度的关系。结果表明,HNBR撕裂强度与DCP单用时的用量呈简单线性关系,并随DCP用量的增大而减小;采用DCP/硫黄配合物作硫化体系时,HNBR撕裂强度保持稳定,当DCP用量为4.5份、硫黄用量为0.9份时,撕裂强度达到最大值64kN/m;采用DCP/TAIC配合物作硫化体系时,HNBR撕裂强度介于DCP单用与DCP/硫黄配合物之间。     

超细石墨/HNBR复合材料的性能研究

采用机械共混法制备超细石墨/氢化丁腈橡胶(HNBR)复合材料,研究超细石墨用量对超细石墨/HNBR复合材料性能的影响.结果表明,超细石墨用量对复合材料的硫化特性影响不大;随着超细石墨用量的增大,复合材料的邵尔A型硬度变化不大,100%定仲应力增大,拉伸强度和拉断伸长率减小,撕裂强度有所降低,体积磨耗量先增大后减小;当超细石墨用量达到40份时,复合材料的摩擦因数明显减小.     

防老剂在氢化丁腈橡胶复合材料中的应用研究

研究优化了防老剂2,2,4-三甲基-1,2-二氢化喹啉聚合物(RD)4,4′-双(α,α′-二甲基苄基)二苯胺(Nargard 445)及Nargard 445与2-疏基苯并咪唑锌盐(MBZ)组合物对氢化丁腈橡胶(HNBR)胶料硫化特性和力学性能的影响,详细讨论了防老剂Nargard 445用量对HNBR胶料性能的影响。结果表明,防老剂种类对HNBR复合材料的硬度影响较小。经过150℃×72h老化后,防老剂Nargard 445单独使用时拉伸强度最高,而防老剂Nargard 445/防老剂MBZ并用的胶料拉伸强度最低。随防老剂Nargard 445用量的增加,胶料的门尼粘度和撕裂强度降低,当防老剂Nargard 445用量为1.5份时,HNBR复合材料表现出最优的拉伸强度,实验范围内防老剂Nargard 445用量的增加对过氧化物的交联效率影响不大,表现为玻璃化转变温度Tg无变化,Nargard 445是HNBR过氧化物硫化体系中较为适合的防老剂。     

不同增黏树脂在HNBR中的应用研究

研究了几种增黏树脂对HNBR硫化特性、力学性能、热空气老化性能及粘合性能的影响,并讨论了Ricobond1756树脂用量对HNBR性能的影响。结果表明,采用Ricobond1756树脂时,胶料力学强度、耐热空气老化性能最好且粘合性能较优异,最适合作为HNBR用增黏树脂;Ricobond1756用量对HNBR与RFL胶乳处理过的玻璃线绳粘合性能影响不大;可采用添加5.0份用量以下的Ricobond1756树脂来达到提高HNBR与胶浆处理尼龙布粘合性能的目的。     

CR/CIIR并用胶的性能研究

试验研究CR／CIIR并用胶的性能。结果表明。采用氧化锌／硫黄硫化体系的CR／CIIR并用胶共硫化性较好；当CR／CIIR并用比为80／20、补强剂为炭黑N550（用量40份）、增塑剂为固体古马隆树脂（用量10份）时，并用胶的综合物理性能较好。     

硫化体系对氢化丁腈橡胶性能的影响

研究了硫黄硫化体系、过氧化物硫化体系、硫黄/过氧化物复合硫化体系对氢化丁腈橡胶(HNBR)硫化特性及力学性能、压缩永久变形和耐热氧老化性能的影响。结果表明,硫黄硫化胶力学性能和压缩永久变形较好;当DCP用量为4~5份时,HNBR硫化胶力学性能和耐热氧老化性能达到最优;在3种硫化体系中,硫黄/过氧化物复合硫化体系有利于提高硫化胶拉断伸长率和撕裂强度。     

HNBR过氧化物硫化体系的研究

研究了硫化促进剂异氰尿酸三烯丙酯(TAIC)、N,N′-间苯撑马来酰亚胺(PDM)和硫黄(S)对氢化丁腈橡胶(HNBR)硫化特性和力学性能的影响。结果表明,含PDM的胶料t10和t90均最短,交联效率较高,力学性能最好;PDM用量为1.5份到3份时能有效提高HNBR胶料的耐热氧老化性能。DCP用量为10份时,增加PDM用量可有效提高HNBR的交联程度,缩短交联时间。     

Effects of Carbon Black on the Properties of HNBR Reinforced by in-situ Prepared ZDMA

Hydrogenated nitrile rubber (HNBR) filled with carbon black (CB) and in-situ prepared zinc dimethacrylate (ZDMA) was prepared by mechanical mixing method. The effects of carbon black on the vulcanization characteristics, physical and dynamic mechanical properties, thermal stability and the fracture surface morphologies of HNBR reinforced by in-situ prepared ZDMA (HNBR/ZDMA) were investigated. The results showed that, for given ZDMA loading (50 phr), with the increasing CB content, the scorch time extended, tensile strength, tear strength and elongation at break increased at first and then decreased, while the modulus at 100% and hardness increased. The comprehensive properties of the HNBR/ZDMA/CB was optimal, when the content of CB was 10 phr. DMA analysis showed that the addition of CB could enhance the storage modulus (E’) & loss modulus (E”), and decreased the glass transition temperature (Tg) of HNBR/ZDMA. TGA analysis revealed that the addition of CB could improve the thermal stability of HNBR/ZDMA. SEM analysis showed that the CB dispersed well in the HNBR/ZDMA, and the CB could improve the dispersion of ZDMA effectively.     

硅酸盐纳米纤维/氢化丁腈橡胶复合材料的性能

研究了热处理时间、偶联剂类型及用量和针状硅酸盐(FS)对硅酸盐纳米纤维/氢化丁腈橡胶(HNBR)复合材料性能的影响。结果表明,微米颗粒的FS在HNBR中能够被解离成纳米纤维,并具有优良的增强效果。FS/HNBR复合材料具有短纤维增强橡胶复合材料的应力-应变特性和各向异性,硅烷偶联剂的加入和热处理能够提高复合材料的力学性能。热处理10min、FS用量为50质量份、偶联剂选用KH-570且其用量为2质量份时复合材料的力学性能较好。     

聚丙烯/马来酸酐接枝聚丙烯/环氧树脂/玻璃纤维复合材料的制备及其性能研究

通过双螺杆挤出机制备了聚丙烯/马来酸酐接枝聚丙烯/环氧树脂/玻璃纤维（PP/PP-g-MAH/EP/GF）复合材料,并研究了PP-g-MAH含量、EP含量及固化剂对复合材料力学性能的影响。结果表明,PP-g-MAH含量为10份,含有固化剂EP的含量为3份时,复合材料的综合力学性能最佳;与不加EP的复合材料相比,其拉伸强度、弯曲强度、冲击强度分别提高了41 %、47 %、86 %。扫描电子显微镜分析表明,EP的加入明显改善了GF和PP基体的黏结强度。     

Swelling and mechanical properties of (acrylonitrile‐butadiene rubber)/(hydrogenated acrylonitrile‐butadiene rubber) blends with precipitated silica filled in gasohol fuels

This work studied the effects of hydrogenated acrylonitrile‐butadiene rubber (HNBR) and precipitated silica (PSi) loadings in acrylonitrile‐butadiene rubber (NBR) filled with 60 parts per hundred of rubber (phr) of carbon black (CB) for oil‐resistant seal applications in contact with gasohol fuel. The cure characteristics, mechanical properties, and swelling behavior of HNBR/NBR blends reinforced with PSi before and after immersion in ethanol‐based oils (E10, E20, and E85) were then monitored. This work studied the effects of PSi loading in rubber compounds on the mechanical properties of the rubber blends. The results suggested that the scorch time of CB‐filled NBR/HNBR was not affected by HNBR loading, but the cure time, Mooney viscosity, and torque difference increased with HNBR content. The swelling of the blends in E85 oil were relatively low compared with those in E10 and E20 oils. The recommended NBR/HNBR blend ratio for oil‐resistant applications was 50/50. Tensile strength and elongation at break before and after immersion in gasohol oils increased with HNBR loading, and the opposite effect was found for tensile modulus and hardness. PSi filler had no effect on scorch time, but decreased the cure time of the blends. The swelling level of the blends slightly decreased with increasing PSi content. The recommended silica content for optimum reinforcement for black‐filled NBR/HNBR blend at 50/50 was 30 phr. The results in this work suggested that NBR/HNBR blends reinforced with 60 phr of CB and 30 phr of silica could be potentially used for rubber seals in contact with gasohol fuels. J. VINYL ADDIT. TECHNOL., 22:239–246, 2016. © 2014 Society of Plastics Engineers     

单甲基丙烯酸锌对HNBR复合材料的增强行为研究

以单甲基丙烯酸锌作为补强剂,采用机械混炼法制备了ZMMA/HNBR纳米复合材料,研究了单甲基丙烯酸锌对氢化丁腈橡胶的补强效果,用热失重分析(TG)、差失扫描热量分析(DSC)及材料拉力机等测试方法对复合材料的结构和性能进行了表征测试。实验结果表明,随着ZMMA用量的增加,复合材料的焦烧时间和正硫化时间均呈减少趋势,橡胶复合材料的交联密度逐渐增加,与高分子拉伸取向行为关联不大100%定伸强度和撕裂强度均增加,扯断伸长率呈单调降低。当ZMMA用量为30 phr时,HNBR复合材料的拉伸强度出现最大值。同时,ZMMA聚合物的存在导致材料的最快分解温度和玻璃化转变温度向高温移动,提高了HNBR复合材料的热稳定性。     

Effect of different nanoparticles on thermal,mechanical and dynamic mechanical properties of hydrogenated nitrile butadiene rubber nanocomposites

Organically modified and unmodified montmorillonite clays (Cloisite NA, Cloisite 30B and Cloisite 15A), sepiolite (Pangel B20) and nanosilica (Aerosil 300) were incorporated into hydrogenated nitrile rubber (HNBR) matrix by solution process in order to study the effect of these nanofillers on thermal, mechanical and dynamic mechanical properties of HNBR. It was found that on addition of only 4 phr of nanofiller to neat HNBR, the temperature at which maximum degradation took place (T_max) increased by 4 to 16°C, while the modulus at 100% elongation and the tensile strength were enhanced by almost 40–60% and 100–300% respectively, depending upon nature of the nanofiller. It was further observed that T_max was the highest in the case of nanosilica‐based nanocomposite with 4 phr of filler loading. The increment of storage modulus was highest for sepiolite‐HNBR and Cloisite 30B‐HNBR nanocomposites at 25°C, while the modulus at 100% elongation was found maximum for sepiolite‐HNBR nanocomposite at the same loading. A similar trend was observed in the case of another grade of HNBR having similar ACN content, but different diene level. The results were explained by x‐ray diffraction, transmission electron microscopy, and atomic force microscopy studies. The above results were further explained with the help of thermodynamics. Effect of different filler loadings (2, 4, 6, 8, and 16 phr) on the properties of HNBR nanocomposites was further investigated. Both thermal as well as mechanical properties were found to be highest at 8 phr of filler loading. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Room temperature and low temperature toughness improvement in SAN/ASA blends by blending with CPE,HNBR, and BR

Styrene‐acrylonitrile copolymer (SAN)/acrylonitrile‐styrene‐acrylate terpolymer (ASA) blends (75/25, wt/wt) was toughened by blending with impact modifiers including chlorinated polyethylene (CPE), hydrogenated nitrile butadiene rubber (HNBR), and butadiene rubber (BR) and the impact property was tested at four temperatures (–30, ?15, 0, and 25 °C). The combination of CPE and HNBR was imported to toughen the SAN/ASA blends, indicating that CPE and HNBR had similar toughening effect at room temperature but HNBR exhibited a better performance at low temperature. When a little HNBR was substituted by BR, the impact strength improved dramatically with the total content of impact modifiers keeping at 30 phr. After 15 phr CPE, 10 phr HNBR and 5 phr BR were employed into blends together, the impact strength reached to a peak of 14 kJ/m² at ?30 °C while the impact strength of the blends individually toughened by 30 phr CPE or 30 phr HNBR was 5 or 12 kJ/m², respectively. The toughening mechanism showed that the low glass‐transition temperature (–108 °C) of BR and the compatibilization between BR and matrix accounted for the improvement of toughness. Simultaneously, scanning electron microscopy, dynamic mechanical analysis, flexural and tensile properties, heat distortion temperature, and Fourier transform infrared spectroscopy were measured. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45364.     

导电炭黑/杜仲胶复合材料电磁屏蔽性能的研究

采用机械共混法制备了导电炭黑/杜仲胶复合材料,研究炭黑用量对复合材料电性能和电磁屏蔽性能的影响。结果表明：随着炭黑用量的增加,复合材料的导电率增大,当炭黑用量为25份时,导电率达到3.3S/cm,导电率遵循导电逾渗规律;复合材料的Payne效应越来越大,有利于形成稳定的导电网络;复合材料的拉伸强度逐渐增大后略微降低,断裂伸长率先增加后逐渐下降。复合材料的屏蔽效能增大,当炭黑用量为20份时,屏蔽效能最高能达到33.2dB,可以满足一般工业或者商业用电子设备的要求。     

Study on wear,cutting and chipping behaviors of hydrogenated nitrile butadiene rubber reinforced by carbon black and in‐situ prepared zinc dimethacrylate

In this study, the wear (Akron and DIN) and the cutting and chipping (C&C) behaviors of hydrogenated nitrile butadiene rubber (HNBR) reinforced by carbon black (N115) and in‐situ prepared zinc dimethacrylate (ZDMA) were investigated. It was validated that ZDMA was more effective than N115 to enhance the wear and C&C resistance of HNBR composites. The Akron wear resistance of the HNBR/N115 composites increased with the content of ZDMA, and the Schallamach ridges observed on the abraded surfaces became less and less clear. With increasing content of ZDMA, the failure mode of the DIN abraded surface underwent the transition from craters to Schallamach ridges, and finally to scratches. The HNBR/N115 composite reinforced by 10 phr ZDMA had the best DIN wear resistance when Schallamach ridges were the dominant failure mode. The use of 30 phr ZDMA can dramatically enhance the C&C resistance of the HNBR/N115 composites. The C&C resistance was suggested to be related to both the variation of the morphology of the C&C ridges and the direction of crack propagation as a function of the content of ZDMA. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011