丁腈再生胶在耐油橡胶制品中的应用

一、前言丁腈再生胶是废丁腈橡胶经脱硫处理而获得的新胶体,它具有丁腈生胶同等的特性。经试验在一般的耐油橡胶制品中,掺入一定比例的丁腈再生胶,不但能改善耐油橡胶制品的物理机械性能,而且能有效地降低     

一种废橡胶加工工艺

正申请公布号:CN 113248807A申请公布日:2021年8月13日申请人:山东鹤鹏技术有限公司、青岛科技大学发明人:刘扶民、林广义、鉴冉冉等本发明介绍了一种废橡胶加工工艺。该加工工艺能够防止橡胶在脱硫过程中因超温使再生胶物理性能下降的问题。本发明的加工工艺包括废胶粉预处理、脱硫处理和再生胶的硫化处理步骤,在废胶粉预处理过程中将二氧化硅纳米粒子悬浮液喷涂于废胶粉表面,然后再进行脱硫处理。     

聚氯乙烯/丁腈胶粉共混型热塑性弹性体

将聚氯乙烯与废丁腈胶粉经高温机械共混，制备了动态交联的共混型热塑性弹性体。讨论了共混比，硫化体系及其用量，废胶粉品种（丁腈胶粉，轮胎胶粉）等因素对热塑性弹性体性能的影响，同时将聚氯乙烯／丁腈胶粉与聚氯乙烯／轮胎胶粉制备的共混型热塑性弹性体的性能进行了比较。结果表明，以聚氯乙烯100份（质量份，下同），邻苯二甲酸二辛酯50份，丁腈胶粉80份，丁腈橡胶20份，过氧化二异丙苯0．5份，氧化锌5份及适量其他助剂可制得综合性能较好的共混型热塑性弹性体。扫描电镜结果显示该共混型热塑性弹性体具有较好的相容性。     

采用微波脱硫罐制备三元乙丙橡胶再生胶

采用自制微波脱硫罐对三元乙丙橡胶(EPDM)胶粉进行微波脱硫制备EPDM再生胶,并研究搅拌速度和脱硫温度等对EPDM再生胶性能的影响。结果表明:搅拌速度对EPDM胶粉的脱硫均匀性有影响,但对EPDM再生胶的物理性能影响不大;脱硫温度对EPDM胶粉的脱硫效果影响很大;当脱硫功率为2 k W、胶粉填充量为5 kg、搅拌速率为60r·min-1、脱硫温度为270℃左右时,EPDM再生胶物理性能较佳。     

影响废旧轮胎胶粉热-机械剪切脱硫再生效果的因素

利用自行研制的长径比为60/1的强剪切型双螺杆挤出机对废旧轮胎胶粉进行热-机械剪切脱硫,用傅里叶变换红外光谱对脱硫胶粉进行了表征,考察了胶粉粒径和喂料螺杆转速与主机转速之比对脱硫胶粉凝胶含量、交联密度及再生胶力学性能的影响,以及脱硫过程中胶粉相对分子质量及其分布的变化。结果表明,随着胶粉粒径的增大,胶粉所受到的剪切力增强,脱硫效果也越好。随着转速比的增加,胶粉的脱硫程度提高;脱硫过程的第1个阶段是交联网络的破坏,第2个阶段除交联网络的破坏外分子主链也发生降解,再生胶的力学性能先增大后减小;当转速比为1.4时再生胶的扯断伸长率和弹性最好,拉伸强度也相对较高。     

橡胶小辞典6条

动态油法脱硫 dynamic heater oil method devulcanizing指将废胶粉同再生剂混匀,装入旋转式脱硫罐或带搅拌器的脱硫罐内,用热蒸汽或蒸汽介质加热进行脱硫的方法。脱硫后的胶片送到精炼工序精炼出片即制得再生胶。     

用双螺杆挤出机脱硫制备再生胶的工艺及性能

利用改进的双螺杆挤出机对废旧轮胎橡胶胶粉进行剪切脱硫,讨论了螺杆转速和反应温度对脱硫效果及再生胶力学性能的影响,通过扫描电镜分析了胶粉脱硫前后形貌的变化及再生胶硫化试样的界面结合状况。结果表明,废旧轮胎橡胶胶粉的凝胶含量和交联密度随着螺杆转速和反应温度的升高明显下降,脱硫胶粉恢复了塑性,再生胶硫化试样的界面结合紧密。将螺杆转速控制在50～120 r/min、反应温度控制在190/180/170～210/190/200℃时脱硫效果最佳,此时再生胶的拉伸强度由未脱硫前的3.1 MPa提高到了12.4 MPa,扯断伸长率由75%提高到452%。     

再生胶生产工艺尾气净化技术和装置

目前,国内普遍采用高温高压、动态脱硫新工艺生产再生橡胶。但该工艺在脱硫罐卸料前,须间歇性、暴发式排出尾气。尾气中含有大量水蒸气和少量胶粉粒子,还含有硫化氢、苯、甲苯、二甲苯等微量有害气体,造成环境污染。针对再生胶动态脱硫工艺的污染问题,江西国燕橡胶有限公司投资60多万元,用了4年时间,研制成功“再生橡胶生产工艺尾气净化技术和装置”,采用吸收和燃烧法净化有害气体和粉尘,有效地解决了再生胶生产尾气净化的难题。一、再生胶生产工艺尾气净化技术简要工艺流程动态脱硫罐排出尾气—胶粉过滤罐—一级交换器—二级交换器—气体膨…     

话说超声波脱硫

介绍了美国阿克隆（AKRON）大学及国内某家企业用超声波常压连续脱硫工艺生产的再生胶及活化胶粉。利用超声波能量切断废硫化橡胶中的S—C,S—S键,生成具有塑性的胶粉,亦称活化胶粉,再经过精炼加工,即成再生胶。用超声波常压连续脱硫工艺生产的再生橡胶的力学性能优良,生产的活化胶粉的各项技术指标已超过国家标准JTJ036．1998SBS I-C,SBS I-D,即可在亚热带及炎热地区铺设高速公路之用。超声波脱硫可降低能耗,减少环境污染,降低生产成本。     

浅谈胶粉项目可行性

废橡胶的主要来源是各种废旧的轮胎、胶鞋、工业杂品等。随着橡胶工业的发展，废橡胶数量与日俱增。为了有效地利用这些宝贵资源，早在30年代，我国就开始了再生胶生产，特别是1991年化工部组织的废胶动态脱硫新工艺技术的研制成功，进一步推动了再生胶工业的发展。目前中国的再生胶生产规模已达50万吨以上，产量名列世界第一。再加上用年代，化工部组织定点推广的活化胶粉、改性胶粉生产，已使我国形成了以再生胶生产为主，活化胶粉、改性胶粉为辅的废胶处理体系，对变废为宝环境保护起到了积极有效的作用。但是，以往的几种废橡胶再生利用…     

裂纹形态对丁腈橡胶力学性能和耐疲劳性能的影响

丁腈橡胶为石化行业应用最为广泛的一类橡胶材料。在受到周期应力的作用下，丁腈橡胶内已存在的裂纹会不断扩展而最终导致橡胶断裂。本文考察了预制缺陷的种类及大小对丁腈橡胶疲劳过程中裂纹扩展情况的影响，并对断面形貌进行了观察。结果表明，在圆形、纵向和横向三种缺陷中，纵向缺陷对丁腈橡胶的力学性能和耐疲劳性能影响最小；对圆形缺陷来讲，随孔直径的增大，丁腈橡胶的耐疲劳性能和力学性能逐渐下降。     

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     

Natural rubber/nitrile butadiene rubber/hindered phenol composites with high-damping properties

New natural rubber (NR)/nitrile butadiene rubber (NBR)/hindered phenol (AO-80) composites with high-damping properties were prepared in this study. The morphological, structural, and mechanical properties were characterized by atomic force microscopy (AFM), polarized Fourier transform infrared spectrometer (FTIR), dynamic mechanical thermal analyzer (DMTA), and a tensile tester. Each composite consisted of two phases: the NR phase and the NBR/AO-80 phase. There was partial compatibility between the NR phase and the NBR/AO-80 phase, and the NR/NBR/AO-80 (50/50/20) composite exhibited a co-continuous morphology. Strain-induced crystallization occurred in the NR phase at strains higher than 200%, and strain-induced orientation appeared in the NBR/AO-80 phase with the increase of strain from 100% to 500%. The composites had a special stress–strain behavior and mechanical properties because of the simultaneous strain-induced orientation and strain-induced crystallization. In the working temperature range of a seismic isolation bearing, the composites (especially the NR/NBR/AO-80 (50/50/20) composite) presented a high loss factor, high area of loss peak (TA), and high hysteresis energy. Therefore, the NR/NBR/AO-80 rubber composites are expected to have important application as a high-performance damping material for rubber bearing.     

汽车油封橡胶材料的研究进展

橡胶密封制品是汽车用橡胶制品不可缺少的重要组成部分,对汽车行驶的舒适性、安全性起到重要的作用。介绍了几种主要的汽车油封橡胶材料与性能以及研究进展,包括丁腈橡胶(NBR)、丙烯酸酯橡胶(ACM)、氟橡胶(FKM)、氢化丁腈橡胶(HNBR)、氟硅橡胶(MFQ)和聚四氟乙烯(PTFE)。     

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.     

P(AM-g-NBR)改性共混型吸水膨胀丁腈橡胶制备与性能研究

以两亲性接枝聚合物丙烯酰胺接枝丁腈橡胶P(AM-g-NBR)为增溶剂,将丁腈橡胶(NBR)与自制的吸水树脂(SAR-PA)共混制备出了吸水膨胀丁腈橡胶WSR-NB。考察了P(AM-g-NBR)及SAR-PA对吸水橡胶性能的影响。实验结果表明,P(AM-g-NBR)的加入可明显改善吸水橡胶的力学性能及吸水性能;随吸水树脂用量增大,吸水橡胶的拉伸强度降低,吸水率增大。     

Epoxidized natural rubber as a reinforcement modifier for silica‐filled nitrile rubber

Hydrated silicas impart better physical properties to polar rubbers, compared to those of hydrocarbon rubbers. However, to achieve optimum properties silane coupling agents are crucial in such formulations. Epoxidized natural rubber (ENR) in small proportions is used as a reinforcement modifier for silica‐filled nitrile rubber (NBR). Two systems of cure were used: N‐cyclohexyl‐ 2‐benzthiazyl sulfenamide (CBS) alone and in combination with diphenyl guanidine (DPG). In the CBS accelerated system, incorporation of an optimum concentration of about 15% of ENR on total rubber was found to improve technological properties. Addition of a secondary accelerator further improves these properties. Comparable results are obtained with those containing coupling agent and NBR–ISAF. High bound rubber and volume fraction values indicate a high polymer–filler interaction and gel content resulting from the NBR–ENR interaction. Results of this study reveal that ENR could be used as a reinforcement modifier for the NBR–silica system. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 292–306, 2002     

Studies on epoxidized rubber seed oil as plasticizer for acrylonitrile butadiene rubber

The application of rubber seed oil (RSO) and epoxidized RSO (ERSO) as a plasticizer in acrylonitrile butadiene rubber (NBR) was studied using RSO and ERSO with different levels of epoxidation. The results indicated that ERSO could be used as a less leachable and low volatility plasticizer for NBR. The use of ERSO in NBR gave better abrasion resistance whereas the tensile strength and tear strength were comparable to those vulcanizates that contained dioctyl phthalate as a plasticizer. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 668–673, 2003     

丁腈橡胶／氯化丁基橡胶共混物的性能研究

研究了丁腈橡胶／氯化丁基橡胶共混物的低温性能和耐热性能。结果表明．选用TMTD／CZ／ZnO作共硫化体系,共混物体系两相的相容性较好;在并用比例为70／30时,与纯NBR相比,共混物Tg下降5.5℃,失重5％热分解温度提高38.4℃,且耐油性变化很小,适宜制备高低温性能较好的耐油橡胶制品。     

TCY／硫黄对ACM／NBR并用胶的交联作用

从混炼胶的硫化特性和硫化胶物理性能等方面考察了三聚硫氰酸（ＴＣＹ）、硫黄和ＴＣＹ／硫黄对丙烯酸酯橡胶（ＡＣＭ）、丁腈橡胶（ＮＢＲ）及其并用胶的交联作用。结果表明,ＴＣＹ／硫黄硫化体系适用于ＡＣＭ／ＮＢＲ并用胶、并用胶的物理性能达到甚至超过了两种胶料的物理性能的加和水平;ＡＣＭ／ＮＢＲ共混并用,加工性能得到明显改善