橡胶微观结构对NBR硫化加工特性的影响

研究了丁腈橡胶(NBR)微观结构对NBR及NBR/炭黑混炼胶硫化加工性能的影响.研究表明:丙烯腈含量增加,分子极性增加,物理交联密度增加,致使焦烧时间缩短,正硫化时间先增长后缩短,提高了胶料的加工性能,硫化速度先增加后减小.加入炭黑后,对低丙烯腈含量的NBR1846的硫化转矩影响最大,减小了因丙烯腈含量造成的流变性能的变化,缩短了硫化时间,提高了硫化转矩和硫化程度,但炭黑对NBR的硫化速度影响不明显.     

丁腈橡胶对白炭黑炭黑补强溶聚丁苯橡胶性能的影响

研究丁腈橡胶（NBR）用量对白炭黑-炭黑补强溶聚丁苯橡胶（SSBR）性能的影响。结果表明：随着NBR用量的增大,白炭黑-炭黑补强SSBR混炼胶的t10和t90缩短,硫化速度提高;硫化胶的拉伸强度略有下降,压缩生热和压缩永久变形增大;NBR用量为4份时可以同时优化胶料的抗湿滑性能、滚动阻力和耐磨性能。     

橡胶微观结构对丁腈橡胶硫化加工特性的影响

青岛中化新材料实验室研究了丁腈橡胶(NBR)微观结构对NBR及NBR/炭黑混炼胶硫化加工性能的影响。研究表明,丙烯腈含量增加,NBR分子极性增加,物理交联密度增大,致使焦烧时间缩短,正硫化时间先延长后缩短,提高了胶料的加工性能,硫化速度先升高后降低。加入炭黑后,对低丙烯腈含量的NBR1846的硫化转矩影响最大,减小了因丙烯腈含量造成的流变性能     

水油环境用丁腈橡胶/氯丁橡胶共混胶性能研究

对丁腈橡胶(NBR)/氯丁橡胶(CR)并用胶在水、油环境下性能的影响因素进行研究,主要研究NBR/CR配比、硫化体系、炭黑和白炭黑对并用胶的物理性能、体积电阻率和耐水、耐油性能的影响。同时研究了硫化时间对NBR/CR并用胶性能的影响。结果表明:NBR/CR并用胶(并用比为70/30)最佳硫化体系为:氧化锌5,氧化镁6,促进剂DM0.4,硫黄2;随着CR用量的增大,NBR/CR并用胶拉伸强度和体积电阻率先增大后减小,耐油性能增强;炭黑N550填充的并用胶的综合性能最佳,且当炭黑N550用量为50份、白炭黑用量为20份时,并用胶性能最佳;最佳硫化时间为50 min。     

丁腈橡胶/受阻酚AO-80/炭黑复合材料中结合丙烯腈量对其结构与性能的影响

在结合丙烯腈量不同的丁腈橡胶(NBR)中加入受阻酚AO-80和炭黑,制备了NBR/AO-80/炭黑(NBR/AO-80/CB)复合材料,用差示扫描量热仪、动态力学分析仪及物理机械性能测试等手段对复合材料的热性能、动态力学性能及物理机械性能进行了研究.结果表明,与纯NBR硫化胶相比,NBR/AO-80/CB复合材料的玻璃...     

填料对NBR硫化性能和动态性能的影响

采用橡胶加工分析仪(RPA2000)、差示扫描量热仪(DSC)研究了填料对丁腈橡胶(NBR)硫化性能和动态性能的影响。研究表明,炭黑对NBR的硫化起促进作用,提高了硫化程度,减少了硫化时间;而TiO2对NBR硫化反应具有明显的延迟作用,硫化反应温度提高约20℃。在NBR硫化胶中,炭黑网络结构较强,应变增加,复合材料呈现较强的"Payne"效应,弹性模量和损耗模量随温度升高或频率降低下降幅度较大;TiO2在NBR中基本不形成填料网络,复合材料的弹性模量和损耗模量受温度、应变和频率的影响较小,与纯NBR变化相似。     

丁腈橡胶低温性能的影响因素研究

研究丁腈橡胶(NBR)低温性能的影响因素。分别考察了NBR结合丙烯腈含量、增塑剂品种、炭黑品种、硫化体系对NBR胶料3种低温性能技术指标[脆性温度、玻璃化转变温度(T_g)、低温回缩10%对应的温度(TR10)]的影响。结果表明:NBR的结合丙烯腈含量是影响NBR胶料低温性能的主要因素,其次是增塑剂品种和硫化体系;并用低结合丙烯腈含量NBR可以改善胶管类产品的低温性能,但不能改善密封橡胶制品的低温密封性能;炭黑品种对NBR胶料T_g和TR10的影响很小,但对脆性温度影响较明显。     

沥青基短切碳纤维/导电炭黑/丁腈橡胶复合材料的结构与性能研究

研究导电炭黑VXC72及沥青基短切碳纤维(CF)用量对丁腈橡胶(NBR)物理性能、导热及导电性能的影响。结果表明,随着导电炭黑VXC72用量的增大,NBR胶料和CF/NBR复合材料的拉伸强度、撕裂强度、定伸应力和热导率逐渐增大,体积电阻率逐渐降低,而且CF/NBR硫化胶的50%、100%定伸应力和热导率比NBR硫化胶有不同程度提高。当导电炭黑VXC72用量相同时,随着CF用量的增大,复合材料的拉伸强度、撕裂强度和拉断伸长率先减小后增大,热导率基本呈线性增加,体积电阻率明显降低。     

炭黑/酚醛树脂增强丁腈橡胶/氯丁橡胶并用胶的性能

采用炭黑与酚醛树脂复合增强体系对丁腈橡胶/氯丁橡胶(NBR/CR)并用胶进行增强,研究了其用量对并用胶硫化特性、力学性能及动态力学性能的影响。结果表明,保持炭黑与树脂总量不变,用酚醛树脂代替部分炭黑后,NBR/CR并用胶的加工性能提高,硫化速率降低,硫化时间延长。当酚醛树脂代替10份炭黑时,并用硫化胶的拉伸强度最大,说明炭黑与树脂具有协同作用。树脂用量相同时,随着炭黑用量的增加,NBR/CR并用硫化胶的Payne效应增强。     

炭黑种类和用量对磁性丁腈橡胶性能的影响

研究炭黑种类和用量对磁性丁腈橡胶(NBR)胶料性能的影响。结果表明：分别将30份炭黑220,N330,N550,N660,N774和N990填充于磁性NBR胶料中,填充炭黑N660的磁性NBR混炼胶的Payne效应最弱(填料网络结构最稳定),填充炭黑N220的磁性NBR硫化胶的物理性能最佳,填充炭黑N550的磁性NBR硫化胶的磁性能最优[剩磁(B_r)为0.220 T,矫顽力(H_cb)为165 k A·m^-1,最大磁能积(BH)_max为9.3 k J·m^-3];分别将不同用量炭黑N550填充于磁性NBR胶料中,填充20份炭黑N550的磁性NBR混炼胶的尺寸稳定性最好,填充30份炭黑N550的磁性NBR硫化胶的拉伸强度最大(9.1 MPa),填充10份炭黑N550的磁性NBR硫化胶的磁性能最优[B_r为0.228 T,H_cb为171 k A·m^-1,(BH)_max为9.9 k J·m^-3...     

复合硫化体系对ACM/NBR共混胶性能的影响

分别采用TCY/硫黄、3#硫化剂/硫黄/促进剂、皂/硫黄/促进剂3种复合硫化体系硫化ACM/NBR共混胶。研究不同复合硫化体系、TCY用量和硫黄用量对ACM/NBR共混胶硫化特性、力学性能、耐热老化性能、耐油性能和压缩永久变形性能的影响,结果表明,TCY/硫黄复合硫化体系硫化的ACM/NBR共混胶的综合性能优于3#硫化剂/硫黄/促进剂和皂/硫黄/促进剂复合硫化体系,当TCY/硫黄的用量为1.5/0.3份时,ACM/NBR共混胶具有良好的综合物理机械性能。     

Investigation on the mechanical properties and oil resistance of sulfur cured nitrile rubber/hydrogenated nitrile butadiene rubber blends

Nitrile rubber (NBR)/hydrogenated nitrile butadiene rubber (HNBR) blends with various ratios were compounded with internal mixer and two-roll open mill. Mechanical properties and low-temperature performance (TR10) of the NBR/HNBR blends after aging under different conditions were investigated. Furthermore, equilibrium swelling test and moving die rheometer (MDR) test were used to systematically investigate the effects of HNBR dosage on the crosslink densities and curing behaviors. Vulcanization torque and crosslink densities decreased with an increase in HNBR content. The crosslink density of pure HNBR is higher than that of pure NBR, which is related to the macromolecular structures of the rubber. Compression sets of the NBR/HNBR vulcanizates were correlated with HNBR dosage indicating a linear relationship. Low-temperature performance of the NBR/HNBR blends was improved after being aged in the synthetic hydrocarbon hydraulic oils (SH-1 and SH-2). This work shows that the low-temperature performance and oil resistance could be better balanced by blending NBR with HNBR, while the mechanical properties maintain relatively high level.     

过氧化物动态硫化的NBR/POM共混物性能的研究

采用过氧化物硫化体系用动态硫化方法制备了丁腈橡胶／聚甲醛（ＮＢＲ／ＰＯＭ）热塑性弹性体。研究了硫化体系、橡塑比对共混物性能的影响。实验结果表明．采用２，５－二甲基－２，５－双（叔丁基过氧基）己烷硫化体系硫化效果较好．共混物的综合性能优异；随着ＰＯＭ用量增加．共混物的拉伸强度略有增加，表观粘度降低，加工性能变好，电绝缘性能、老化性能和耐油性能均得到明显改善。     

黑液-硅藻土共沉物在丁腈橡胶与丁苯橡胶中的应用研究

通过絮凝-酸沉降法制备了一种复合补强剂——黑液-硅藻土共沉物(CLD),将其分别与丁腈橡胶(NBR)和丁苯橡胶(SBR)机械共混制得NBR/CLD与SBR/CLD复合材料。考察了CLD的含量对橡胶复合材料硫化特性、交联密度、力学性能、热氧老化性能以及热性能的影响。结果表明:随着CLD的加入,焦烧时间与正硫化时间逐渐降低,硫化速度逐渐提高;交联密度逐渐增加;力学性能逐渐增强;但老化性能及热性能没有得到改善。     

Using of leather fibers as an additive in elastomeric compounds: Its effect on curing behavior and physico‐mechanical properties

In this study, leather fibers have been used as an additive in several elastomeric compounds based on nitryl butadiene rubber (NBR), chloroprene rubber (CR), ethylene–propylene–diene monomer (EPDM), and chlorinated isobutylene‐isoprene rubber (CIIR). The effects of employing fibers upon vulcanization characteristics, physico‐mechanical and thermal properties of the compounds were studied. Measuring of vulcanization characteristics of the compounds exhibited that leather fibers has no considerable effect on initial viscosity, processability, and curing time of the compounds but increases cross‐link density. Evaluation of mechanical properties of the vulcanized compounds showed that using leather fibers leads to increase in tensile strength of NBR‐based compound due to compatibility between NBR and leather fibers. Also hardness of all compounds increased drastically by employing leather fibers. The obtained results showed incorporation of leather fibers had no considerable effect on resilience, density, and thermal stability of compounds but enhanced liquid resistance. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

聚醚型混炼型聚氨酯与丁腈橡胶的并用研究

研究聚醚型混炼型聚氨酯(MPU)/丁腈橡胶(NBR)并用比对MPU/NBR并用胶性能的影响。结果表明:随着NBR用量的增大,胶料的M_H增大,t_(90)延长,硫化速率下降;硫化胶的交联密度增大,压缩永久变形减小,热稳定性和耐低温性能提高,耐臭氧老化性能下降,耐油性能变化不大。     

Dynamically vulcanized nitrile rubber/polyoxymethylene thermoplastic elastomers

A new type of oil‐resistant thermoplastic elastomer of nitrile rubber (NBR) and polyoxymethylene (POM) prepared by dynamic vulcanization were studied. The effects of the curing systems for NBR, acrylonitrile content in NBR, POM content, thermal aging, and reprocessing have on the mechanical properties of NBR/POM thermoplastic elastomers were investigated in detail. NBR/POM thermoplastic elastomers have high tensile strength and excellent oil resistance at elevated temperature. NBR/POM thermoplastic elastomers can be produced in a wide range of hardness. NBRs with higher acrylonitrile content are more suitable for preparing NBR/POM thermoplastic elastomer with high tensile strength and good oil resistance. The NBR/POM thermoplastic elastomer has significantly improved electrical insulation properties compared with NBR (Gessler, M. U.S. Pat. 3,037,954, 1962). © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2641–2645, 2000     

不同硫化体系对环保型硬丁腈橡胶性能的影响

以松香酸皂与油酸皂组成的复合乳化体系制备的中试产品丁腈橡胶(NBR)为基胶,分别用硫黄体系和过氧化物体系进行硫化,研究了NBR混炼胶的硫化特性和硫化胶的物理机械性能、耐老化性能、耐油及耐寒性能,并与传统产品NBR 3604进行了比较。结果表明,采用硫黄体系时,NBR混炼胶的硫化程度较浅,硫化速率较慢;采用过氧化物体系时,NBR混炼胶的硫化程度较深,硫化速率较快,NBR胶料宜采用过氧化物硫化体系进行硫化;2种硫化体系下制得NBR硫化胶的物理机械性能与NBR3604硫化胶相差不大,过氧化物硫化体系制得NBR硫化胶的耐老化性能较好;与NBR 3604硫化胶相比,2种硫化体系下制得NBR硫化胶的耐寒性稍好,耐油性稍差。     

Dynamically vulcanized nitrile rubber/polypropylene thermoplastic elastomers

A new compatibilized method was used to prepare thermoplastic elastomer (TPE) of nitrile rubber (NBR) and polypropylene (PP) with excellent mechanical properties by dynamic vulcanization. Glycidyl methacrylate (GMA) grafted PP/amino‐compound was used as a compatibilizer. The effects of the curing systems, compatibilizer, PP type, and reprocessing on the mechanical properties of NBR/PP thermoplastic elastomers were investigated in detail. Experimental results showed that the addition of amino‐compound in the compatibilzer can significantly increase the mechanical properties of the NBR/PP thermoplastic elastomer. Compared with other amino‐compounds, diethylenetriamine (DETA) has the best effect. PP with higher molecular weight is more suitable for preparing NBR/PP thermoplastic elastomer with high tensile strength and high elongation at break. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 2862–2866, 2002