耐甲醇汽油的NBR/PVC共混胶研究

采用丁腈橡胶（NBR）/聚氯乙烯（PVC）共混胶作为耐含甲醇汽油胶料主体材料,重点研究胶料的耐甲醇汽油性能。选择合适的NBR/PVC共混比、合理选用增塑剂和填料品种和用量对胶料十分重要。     

耐甲醇汽油的NBR/PVC共混胶研究

采用丁腈橡胶（NBR）/聚氯乙烯（PVC）共混胶作为耐含甲醇汽油胶料主体材料,重点研究胶料的耐甲醇汽油性能。选择合适的NBR/PVC共混比、合理选用增塑剂和填料品种和用量对胶料十分重要。     

NBR/PVC耐油阻燃电缆护套胶料的研制

介绍耐油阻燃丁腈橡胶（NBR）/聚氯乙烯（PVC）电缆护套胶料的研制。确定配方为：NBR,70;PVC,30;氧化锌,5;硬脂酸,1;防老剂4010NA,2;炭黑N220,20;炭黑N330,30;增塑剂DOP/DOS,30;阻燃剂,45;复合硫化剂,1.5;促进剂,2.5;其他助剂,4;合计231。胶料物理性能、耐油性能和阻燃性能优良。胶料可用作油田电缆、煤矿阻燃电缆、船用电缆的护套材料。     

NBR/PVC热塑性弹性体的性能研究及应用

选用不同硫化体系,用动态硫化法制备了丁腈橡胶(NBR)/聚氯乙烯(PVC)热塑性弹性体,考察了硫化体系、增塑剂邻苯二甲酸二辛酯(DOP)用量、填料种类、NBR与PVC的质量比对热塑性弹性体性能的影响.结果表明,采用过氧化二异丙苯/硫磺复合硫化体系硫化的热塑性弹性体的性能较好;炭黑的增强效果优于白炭黑和轻质碳酸钙;DOP用量增加,热塑性弹性体的综合力学性能下降;NBR与PVC的质量比增加,热塑性弹性体的柔性增加.所研制的NBR/PVC经压延塑化造粒、注射成型可以制得某品牌汽车的油箱密封垫片,极大地提高了生产效率,提高了市场竞争力.     

增塑剂DOP对NBR/PP共混物性能的影响

研究增塑剂DOP对NBR／PP共混物物理性能、结晶性能及流变特性的影响。结果表明，随着增塑剂DOP用量增大，NBR／PP共混物的硬度明显降低，流动性能显著提高；增塑剂DOP用量对共混物的结晶性能影响不大；加入增塑剂DOP，共混物老化后的100％定伸应力和拉伸强度提高，拉断伸长率和流动性能下降。     

水滑石/丁腈橡胶纳米复合材料的制备及性能研究

采用乳液复合法制备水滑石(LDHs)/丁腈橡胶(NBR)纳米复合材料,并对其结构和性能进行研究。结果表明:复合材料中LDHs均匀分散在NBR基体中;与NBR胶料相比,LDHs/NBR复合材料的物理性能和气体阻隔性能明显提高;当LDHs/NBR用量比为1/20且LDHs用量为1份时,LDHs/NBR复合母胶/溴化丁基橡胶并用胶的气体阻隔性能较好。     

芳烃油在NBR及其并用胶胶料中的应用

芳烃油等量替代增塑剂DBP在NBR和NBR/SBR及NBR/CR胶料中的应用试验结果表明,采用芳烃油对胶料的性能无不良影响。芳烃油等量替代增塑剂DBP在NB胶管内层胶和NBR/SBR耐油胶板胶料中的实际应用试验结果表明,采用芳烃油有利于降低胶料成本。     

纳米氢氧化镁/玻璃纤维/丁腈橡胶复合材料的耐老化性能及阻燃性能

采用纳米氢氧化镁（MH）、玻璃纤维（GF）及丁腈橡胶（NBR）制备了MH/GF/NBR复合材料,并研究了MH和GF的加入量对复合材料耐老化性能及阻燃性能的影响。结果表明,MH与GF的加入使得MH/GF/NBR复合材料的拉伸强度、扯断伸长率、邵尔A硬度及压缩永久变形性能得到改善。随着老化时间的延长,复合材料的内部结构变差,GF突起增多。MH和GF均能有效提高复合材料的耐老化性能与阻燃性能。MH对阻燃性能的改善较为优异,GF对耐老化性能的改善较为优异,2种填料配合使用有利于延长材料的使用寿命。     

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。     

LNBR对NBR/PVC共混胶性能的影响

液体丁腈橡胶(LNBR)作为一种新型液体增塑剂及橡胶软化剂,因其与丁腈橡胶有着相似的分子结构,在起到增塑作用的同时,在胶料硫化过程中也可以参与共交联。本文在NBR/PVC共混过程及混炼过程的影响加入LNBR,初步研究其对共混物加工性能、硫化性能及成品物理机械性能、耐寒性能、耐油抽出性能的影响。试验结果证明LNBR能有效降低NBR/PVC共混胶的门尼粘度,改善其加工性能;提高了共混胶的压缩性能,同时发现LNBR的耐油抽出性能要高于酯类增塑剂。     

Microwave absorption performance of nitrile butadiene rubber/ethylene propylene diene monomer rubber filled with multiwalled carbon nanotubes

In recent times, there is an increasing need for effective control of electromagnetic pollution, which can avoid excessive radiation effects on the human body. Microwave absorption materials are attracting wide research interests to reduce electromagnetic pollution due to the rapid development of electronic equipment. In this study, Nitrile butadiene rubber (NBR)/ethylene propylene diene monomer rubber (EPDM) were mixed with multiwalled carbon nanotubes (MWCNT) to prepare microwave absorbing materials. The distribution of fillers, AC conductivity, complex permittivity, and microwave absorption performance of the composites were systematically investigated. It found that the AC conductivity, both real and imaginary parts of the permittivity were significantly improved in the composite with the increasing ratio of MWCNT contents. The NBR/EPDM/MWCNT composites with eight parts per hundred concerning with rubber (phr) MWCNT had a minimum reflection loss (RLmin) of −48.1 dB at the optimum thickness of 2.07 mm. Importantly, the adding sequence of MWCNT and plasticizer dioctyl phthalate (DOP) to the rubber matrix is found to play an important role in determining the distribution of fillers and the structure of polymer blends. The composite with plasticizer added before MWCNT exhibited a better impedance matching and as a result, achieved a good microwave absorption performance.     

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。     

The effect of low levels of plasticizer on the rheological and mechanical properties of polyvinyl chloride/newsprint-fiber composites

Plasticizers play a key role in the formulation of semirigid and flexible PVC and in determining their physical properties and processability. This study examines the effects of the low phr levels of plasticizer (DOP) on the rheological and mechanical properties of rigid and semi-rigid PVC/newsprint-fiber composites. Mechanical and rheological properties of unfilled PVC compounds and PVC/newsprint-fiber composites at 45 phr were compared over the range of 0 to 15 phr of DOP plasticizer. Analyses of data using SAS procedures of ANOVA were also conducted to discern the effects of concentration of plasticizer on these properties. The following conclusions were reached: (1) DOP was relatively ineffective in improving melt flow index of the composites compared to unfilled PVC. (2) The composites were significantly inferior in tensile strength at yield and stiffer than unfilled PVC. The differences observed were roughly the same over the DOP range studied. (3) Elongation at break and toughness (break energy) were lower for the composites and were essentially independent of DOP level, whereas there was a significant improvement for unfilled PVC over the DOP range studied. (4) Impact strengths of the composites and unfilled PVC were essentially comparable up to about 11.25 phr of DOP. However, at 15 phr DOP, impact strength of the composite was far inferior to that of unfilled PVC. (5) The well-known antiplasticization effect was noted for unfilled PVC, as well as to some extent for the filled PVC.     

聚1,2-丙二醇新戊二醇己二酸酯增塑性能的研究

将合成的聚1,2-丙二醇新戊二醇己二酸酯(简称PG-AA-NPG)聚酯增塑剂增塑PVC的试片制成复合材料,并进行耐迁移、DSC、力学性能、热稳定性能测试,分析PG-AA-NPG的综合性能,并且与加入DOP和市售聚酯增塑剂A的PVC试片进行对比.结果表明PG-AA-NPG的耐溶剂迁移性优于DOP;PVC/PG-AA-NP...     

Friction properties of graphene reinforced nitrile rubber composites after thermal oxidation aging: Experiment and molecular dynamics simulation

We established friction models for pure NBR, GNS/NBR, and GO/NBR composites through molecular dynamics (MD) simulation. Our study focused on the impact of GNS and GO on the friction properties of nitrile rubber (NBR) composite materials after undergoing thermal oxygen aging. Based on the simulation results, it can be observed that the GNS/NBR and GO/NBR composites' coefficient of friction (COF) decreases by 20.8% and 24.8%, respectively, at 348 K. Additionally, the abrasion rate is reduced by 17.4% and 25.7%, respectively, for the same composites. Adding GNS and GO can effectively improve the friction performance of the NBR composite system, and compared with GNS, GO shows a better enhancement effect. Pure NBR and GO/NBR composite materials were prepared by mechanical blending method, and the friction properties of GO-enhanced NBR composite materials were studied. The experimental results show that the GO/NBR composite material can maintain a low friction and wear coefficient after thermal and oxygen aging. It shows that adding GO can effectively improve the friction properties of NBR composite systems and slow down the weakening effect of aging on the friction properties of NBR composite materials. This is because the GO surface contains wealthy functional groups such as epoxy groups, which enhances the binding strength between the GO and NBR interface so that the GO/NBR composite material exhibits better friction properties and thermal oxygen aging resistance. In addition, the wear surface was characterized by scanning electron microscopy (SEM), revealing the damage mechanism of friction and wear of NBR composite materials.     

Synthesis and characterization of polymeric plasticizer from PET waste and its applications in nitrile rubber and nitrile–PVC blend

Polyethylene terephthalate (PET) waste is not biodegradable; thus, it will create environmental hazards if disposed in landfills. Therefore, the only way of addressing the problem of disposal of post-industrial and post-consumer PET wastes is through recycling. The polyester plasticizer for polyacrylonitrile butadiene rubber (NBR) and polyacrylonitrile butadiene–polyvinylchloride rubber blend (NBR–PVC) was obtained by the depolymerization of PET waste with 2-ethyl-1-hexanol. The PET waste was depolymerized until a polymeric plasticizer with the average molecular weight in the range of 450–900 g/mol was obtained. The polymeric plasticizer was characterized for acid and hydroxyl numbers, viscosity, density, FTIR, NMR and TGA/DTA thermogram. The prepared polymeric plasticizer was used in the preparation of nitrile rubber and nitrile–PVC rubber blend rubber sheets, where these sheets were tested for compatibility, tensile strength, elongation-at-break, hardness and ageing properties. Nitrile rubber and nitrile–PVC blend sheets were also prepared using DOP as a plasticizer and a comparative study with the synthesized polymeric plasticizer was made. It was observed that synthesized polymeric plasticizer provides excellent tensile properties and ageing resistance for high-performance applications as compared to that obtained from DOP. The end uses for nitrile rubber and nitrile–PVC rubber blend compounds are quite diverse, but they can be loosely categorized as being either general performances or higher performance applications. Each of these performance categories requires a different set of considerations in terms of compounding with plasticizers.     

不同增塑体系对丁腈橡胶老化前后及胶管扣压过程性能的影响

本文主要研究了不同增塑体系对丁腈橡胶老化前后物理机械性能的影响,以热油老化后的丁腈橡胶的应力-应变曲线作为材料参数,考察不同增塑体系对丁腈胶管扣压过程中性能变化的影响;硫化特性实验结果表明:使用DOP或DOA作为增塑剂时,硫化胶转矩差值较大,使用液体丁腈或聚硫橡胶作为增塑剂时,转矩差值相对较低,其中使用聚硫橡胶作为增塑剂时,焦烧时间较短;物理机械性能实验结果表明:使用液体丁腈或聚硫橡胶作为增塑剂时,丁腈橡胶硫化胶耐热空气老化性能保持率相对较高,耐热油老化后质量体积变化率相对较低;仿真计算结果表明:使用DOP或DOA作为增塑剂时,静刚度、应变能密度及节点处Mises应力较大,使用液体丁腈或聚硫橡胶作为增塑剂时,静刚度、应变能密度及节点处Mises应力相对较小。     

Si-69改性白炭黑增强受阻酚／丁腈橡胶复合材料的制备与性能研究

在丁腈橡胶（NBR）中加入受阻酚AO—80和不同份数Si-69改性的白炭黑,制备了NBR／AO-80／白炭黑／Si-69复合材料。利用差示扫描量热（DSC）,动态力学分析（DMA）,力学性能测试等手段对复合材料动态力学性能及力学性能进行了研究。结果表明：与纯NBR相比。复合材料玻璃化转变温度向高温移动。损耗峰峰值有所降低,损耗峰位置向高温移动,有效阻尼温度区域有所拓宽,其损耗峰峰值高于1．25。有效阻尼温度区域（≥0．3）大于32℃,表明复合材料具有良好阻尼性能;与NBR／AO-80复合材料和纯NBR相比,复合材料力学性能有大幅度提高,拉伸强度达到28．3MPa,撕裂强度达到44．8kN／m。     

增塑剂对丁腈橡胶/聚丙烯热塑性硫化橡胶性能的影响

研究了邻苯二甲酸二辛酯(DOP)、偏苯三酸三(2-乙基己酯)(TOTM)、聚酯和邻苯二甲酸烷基.苄酯4种增塑剂对丁腈橡胶(NBR)聚/丙烯(PP)热塑性硫化胶(TPV)邵尔A硬度、耐油性能和流变性能的影响,并用透射电镜分析了4种增塑剂对NBR/PP TPV相态结构的影响。结果表明,TOTM的增塑效果最好,可制备出低硬度、高耐油和流动性好的NBR/PP TPV,并且分散相的粒径小、大小均匀;随着TOTM用量的增加,NBR/PP TPV的邵尔A硬度降低,流动性提高,但TOTM用量不宜超过50份。