NBR／CSM并用比对共混胶耐热耐油性能的影响

研究了NBR／CSM并用比对共混胶硫化性能、力学性能、耐热老化性能和耐油性能的影响,并采用了扫描电镜分析方法表征共混胶浸油前后的结构。结果表明,随NBR用量的增加,共混胶的硫化效率提高,加工安全性能增强,耐油性能有所上升,但其耐热性能有所下降。当NBR／CSM并用比为60／40时,通过力学性能可知,共混胶中两相结构发生相反转。综合其性能,当NBR／CSM并用比为60／40时,共混胶具有最佳的耐热耐油性能,浸油后的抗拉强度保持率达到69％,断裂伸长率保持率达到86％,质量变化率为lO％,体积变化率为15％。     

动态硫化丁腈橡胶/二元共聚氯醚共混胶的制备与性能

采用动态硫化法制备了丁腈橡胶(NBR)／二元共聚氯醚(ECO)共混胶,研究了动态硫化温度、时间及不同丙烯腈含量的NBR对动态硫化胶性能的影响,对比了动态硫化胶和常规共混胶在性能上的差异。结果表明,当动态硫化温度为150℃．动态硫化时间为NBR的正硫化时间时,NBR／ECO共混胶中内聚能密度大的ECO为连续相。与常规共混胶相比,动态硫化胶具有低压缩永久变形及良好的力学性能、耐老化性能和耐油性能。     

NBR／EPVC共混胶硫化特性和耐油性能的研究

以NBR／EPVC共混比、DOP用量和DCP用量为变量,研究了NBR／EPVC共混胶的硫化特性（最小转矩和最大转矩）和耐油性能（耐油质量变化率和体积变化率）。结果表明,随EPVC用量的增加,共混胶硫化特性变差．硫化速度减慢,耐油性能下降;随DOP用量的增加,共混胶硫化性能变差．硫化速度变化不大,耐油性能先提高后下降;随DCP用量的增加,共混胶硫化性能改善,硫化速度加快,耐油性能下降。     

共混比对丁腈橡胶/氯醚橡胶性能的影响

研究了共混比时常规共混及动态硫化共混丁腈橡胶(NBR)／氯醚橡胶(ECO)的力学性能及加工流变性能的影响。结果表明,共混比对NBR／ECO胶料的力学性能及加工流变性能影响显著。NBR经动态硫化后,压缩永久变形及挤出胀大明显减小,拉伸强度提高,表现黏度随ECO用量的增大而减小。共混比对常规共混胶的表观黏度影响不大。动态硫化有利于改善NBR／ECO胶料的加工性能。     

动态硫化法制备丁腈橡胶/二元共聚氯醚密封材料

采用动态硫化法制备了丁腈橡胶（NBR-41）／二元共聚氯醚（ECO）共混胶,对其结构进行了表征,研究了其物理机械性能、流变性能和动态力学性能等,并与常规共混胶进行了对比。结果表明,动态硫化胶中NBR-41为分散相,ECO为连续相;与NBR-41／ECO常规共混胶相比,NBR-41／ECO动态硫化胶具有高拉伸强度、低压缩永久变形、低损耗、良好的加工性能及耐低温性能;NBR-41／ECO动态硫化胶的气密性能与ECO相当,而耐油性能优于ECO。     

NBR/PVC共混物耐溶剂性能的研究

考察了NBR／PVC共混比和NBR／PVC与EPDM,IIR或PU三元硫化共混物在天那水中的体积变化和物理性能变化。结果表明,当NBR／PVC以70／30共混时,二元共混物的耐溶剂性能最好;NBR／PVC／PU共混比为50／20／30时,三元共混物耐天那水性能最好,经天那水浸泡后的性能变化很小。     

ECO/NBR共混胶的性能

考察二元共聚氯醚橡胶(ECO)与不同丙烯腈质量分数的NBR共混胶的物理性能、耐老化性能及耐油性能。结果表明，共混胶的物理性能提高，ECO／NBR-4l共混胶的耐热老化性能优于ECO／NBR-35和ECO／NBR-26共混胶．NBR-4l的耐油性能最好。共混比为60／40的ECO／NBR-4l共混物具有优异的耐油性能，玻璃化温度范围为-46～-43℃，可满足耐寒制品的使用要求。     

影响NBR/PVC共混硫化胶性能因素的研究

系统研究了影响丁腈橡胶/聚氯乙烯(NBR/PVC)共混胶性能的主要因素,包括PVC塑化温度、增塑剂用量、橡塑比、PVC的聚合度、NBR的丙烯腈质量分数。研究结果表明,塑化温度在160℃、增塑剂用量为20份、橡塑比为60/40~70/30时,NBR/PVC共混硫化胶综合性能较好。随着PVC聚合度的提高,NBR/PVC共混硫化胶力学性能得到提高;NBR中丙烯腈含量的增大有利于NBR/PVC共混硫化胶性能的提高。     

模量匹配对MPU/NBR共混胶性能的影响

探究了MPU/NBR共混胶在硫化过程和热氧老化过程中,橡胶模量变化对共混胶性能的影响。研究表明,MPU的硫化速度缓慢,而NBR的硫化速度相较于MPU快速,这种硫化特性的差异导致共混胶中MPU相的硫化受到抑制,力学性能出现MPUNBR30MPU /70NBR70MPU/30NBR的现象。但是在后期热空气老化过程中,MPU相发生二次硫化,交联程度变大,共混胶性能逐渐呈现两相加和效果的趋势,即MPU70MPU/30NBR30MPU /70NBRNBR。     

硫化体系对氯醚橡胶/丁腈橡胶共混胶性能的影响

研究了氯醚橡胶(ECO)和丁腈橡胶(NBR)的共硫化性能,并讨论了硫化体系及硫化剂用量对ECO/NBR共混胶力学性能、耐油性能、耐臭氧性能和热稳定性的影响。结果表明,采用NA-22/DTDM/TMTD/TCY并用硫化体系且NA-22用量为1.5份,ECO/NBR共混胶综合性能达到最佳平衡状态。     

超细全硫化粉末丁腈橡胶/二元共聚氯醚橡胶共混物的结构与性能

采用熔融共混工艺制备了超细全硫化粉末丁腈橡胶(UFPNBR)/二元共聚氯醚橡胶(ECO)共混物,研究了共混物的相态结构、动态力学性能、物理机械性能及老化性能,并与丁腈橡胶(NBR)/ECO共混物进行了对比.透射电镜观察表明,在UFPNBR/ECO体系中,UFPNBR为分散相,ECO为连续相;而在NBR/ECO体系中,ECO为分散相,NBR为连续相.动态力学性能分析结果显示在共混质量比不超过50/50时,UFPNBR/ECO共混物只存在1个玻璃化转变温度;当共混质量比超过50/50时分散相尺寸较大,出现2个玻璃化转变温度,而NBR/ECO始终存在2个玻璃化转变温度.加入适量的UFPNBR(不超过50份,质量)能降低UFPNBR/ECO共混物的压缩永久变形.与NBR/ECO共混物相比,UFPNBR/ECO共混物的脆性温度较低,耐老化性能更好,但物理机械性能稍差.     

DMA analysis of the damping of ethylene–vinyl acetate/acrylonitrile butadiene rubber blends

The mechanical and damping properties of blends of ethylene–vinyl acetate rubber (VA content > 40% wt) (EVM)/acrylonitrile butadiene rubber (NBR), with 1.4 phr BIPB [bis (tert‐butyl peroxy isopropyl) benzene] as curing agent, were investigated by DMA and DSC. The effect of chlorinated polyvinyl chloride (CPVC), silica, carbon black, and phenolic resin (PF) as a substitute curing agent, on the damping and mechanical properties of EVM/NBR blends were studied. The results showed that 10 phr CPVC did not contribute to the damping of EVM700/NBR blends; Silica could dramatically improve the damping of EVM700/NBR blends because of the formation of bound rubber between EVM700/NBR and silica, which appeared as a shoulder tan δ peak between 20 and 70°C proved by DMA and DSC. This shoulder tan δ peak increased as the increase of the content of EVM in EVM/NBR blends. The tensile strength, modulus at 100% and tear strength of the blend with SiO₂ increased while the elongation at break and hardness decreased comparing with the blend with CB. PF, partly replacing BIPB as the curing agent, could significantly improve the damping of EVM700/NBR to have an effective damping temperature range of over 100°C and reasonable mechanical properties. Among EVM600, EVM700, and EVM800/NBR/silica blend system, EVM800/NBR/silica blend had the best damping properties. The EVM700/NBR = 80/10 blend had a better damping property than EVM700/NBR = 70/20. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

丁腈橡胶/三元乙丙橡胶并用胶的制备及性能

将丁腈橡胶(NBR)与三元乙丙橡胶(EPDM)并用,考察了生胶牌号、并用比、并用工艺对NBR/EPDM并用胶性能的影响,并对其耐臭氧及耐油性能进行了分析.结果表明,选用第三单体为亚乙基降冰片烯(即E型)的EPDM可以改善其与NBR的共硫化性能;当门尼黏度相近的NBR与EPDM的并用比(质量比)为70/30,且采用2种生胶先混炼,而后加入各种配合剂的制备工艺,并用胶具有良好的耐臭氧性能及物理机械性能;具有以NBR为连续相、EPDM为分散相结构形态的并用胶有较好的耐油性能与良好的耐臭氧性能.     

丁腈橡胶/聚氯乙烯共混胶

探讨了丁腈橡胶(NBR)中的结合丙烯腈质量分数、NBR／聚氯乙烯(PVC)(质量比,下同)、增塑剂邻苯二甲酸二辛酯(DOP)用量、PVC聚合度对NBR／PVC共混胶性能的影响,研究了NBR／低聚合度PVC共混胶的力学性能及加工流动性能。结果表明,随着NBR中结合丙烯腈质量分数的增加,NBR／PVC共混胶的耐油性能明显增强,力学性能也相应有所改善;NBR／PVC为80／20～60／40时．NBR／PVC共混胶的综合性能较好;DOP用量对NBR／PVC共混胶性能的影响不大;聚合度为700的PVC更适合于生产NBR／PVC共混胶,其力学性能、加工流动性能、耐老化性能与德国Bayer公司生产的牌号为Perbunan NT／VC3470B的NBR／PVC共混胶相当。     

Preparation and characterization of polymethyltrifluoropropylsilicone modified acrylonitrile–butadiene rubber/fluorosilicon rubber blend

The blending of polymethyltrifluoropropylsilicone‐modified acrylonitrile–butadiene rubber (MNBR) and fluorosilicon rubber (FSR) at 70 : 30 ratio was investigated. The grafting of mercapto‐functionalized polymethyltrifluoropropylsilicone onto acrylonitrile‐butadiene rubber (NBR) by thiol‐ene reaction was carried out with 2,2′‐azobisisobutyronitrile as initiator in a Haake torque rheometer. The rheological properties of NBR grafting obtained at varying dosages of polymethyltrifluoropropylsilicone in a Haake torque rheometer were studied using torque curves. Grafting reaction was confirmed by ¹H nuclear magnetic resonance and energy‐dispersive X‐ray spectroscopy. Results of scanning electron microscopy and dynamic mechanical analysis showed better compatibility of MNBR/FSR blend than NBR/FSR reference blend. Meanwhile, the macro‐mechanical properties of the blend significantly improved. The tensile strength and tear strength of MNBR/FSR blend were improved to 14.34 MPa and 44.94 KN/m, respectively, which were 2.92 MPa and 13.03 KN/m higher than those of NBR/FSR reference blend. The low‐temperature brittleness of the blend was improved to ?57°C, an increase of ?6°C compared with that of NBR. These results indicated that MNBR/FSR blend at 70 : 30 ratio had improved compatibility because of the grafting chains that acted as interfacial agents. The low‐temperature resistance of the blend was also enhanced. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42328.     

有效硫化体系下对MPU/NBR共混胶性能的研究

探究了在有效硫化体系下,聚醚型混炼型聚氨酯橡胶(MPU)与丁腈橡胶(NBR)并用比对共混胶性能的影响。研究表明,NBR的加入使得共混胶硫化速度变快,随着NBR份数的增加,拉断强度和扯断伸长率不断下降,表观交联密度先减小后增大,不同伸长率下的定伸应力呈现不同的变化规律。共混胶耐热空气老化性能和耐热油老化性能优异,在80℃高温拉伸中,MPU的拉断强度折损率要高于NBR。在动态力学性能研究中发现,20份NBR的加入使得共混胶动态生热明显增大。     

配方因素对均聚型/共聚型氯醚橡胶共混物耐热老化性能的影响

采用机械共混方法制备了均聚型/共聚型氯醚橡胶(CO/ECO)共混物,考察了配方因素对共混物耐热老化性能的影响。结果表明,CO和ECO二者的共混比对共混物耐热老化性能影响不大。增强剂的种类对耐热老化性能影响较为显著,以填充沉淀法白炭黑和气相法白炭黑共混物的耐热老化性能较好;以炭黑为增强剂时,其用量以40~50份为佳。以三聚硫氰酸为硫化体系硫化的共混物,其热稳定性优于以1,2-亚乙基硫脲为硫化体系硫化的共混物。添加各种软化剂,均会导致共混物耐热老化性能下降;而各种防老剂中,以防老剂NBC、4010 NA和RD对共混物的防老化效果为最好。