耐低温耐臭氧易装配CR/NBR/PVC汽车等速万向节环保防尘罩共混胶的配方优化

进行耐低温耐臭氧易装配氯丁橡胶(CR)/丁腈橡胶(NBR)/聚氯乙烯(PVC)汽车等速万向节环保防尘罩共混胶的配方优化。胶料优化配方为:CR70,NBR(丙烯腈质量分数为0. 19)/PVC橡塑合金(以主体材料计)30,炭黑N55015,炭黑N99025,白炭黑8,硬脂酸1. 5,增塑剂TP-9525,内脱模剂935P1,莱茵蜡6541,防老剂4010NA2,防老剂NDBC1,防老剂MB0. 5,间接法氧化锌5,活性氧化镁3,硫黄/促进剂2. 8。优化配方胶料的物理性能、耐低温性能、耐臭氧性能、耐热老化性能和耐油性能满足用户耐低温耐臭氧环保防尘罩胶料标准要求,环保性能达到欧盟RoHS指令要求,生产成本较低,用其制备的防尘罩装配性能好。     

铁路用耐低温减震橡胶制品的配方优化

研究铁路用耐低温减震橡胶制品的配方优化。通过优化橡胶主体材料、炭黑、硫化体系,添加耐低温增塑剂等措施优化配方,铁路用减震橡胶制品的耐低温性能有效提高,且物理性能、耐热性能和耐疲劳性能良好。     

海上运输管道柔性接头内部弹性体用胶料的配方设计

研究海上运输管道柔性接头内部弹性体用胶料的配方设计。通过对柔性接头内部弹性体用胶料的橡胶[丁腈橡胶（NBR）]、补强填料、增塑剂、硫黄和促进剂进行正交试验分析,确定其最优组合为NBR6240和6280用量分别为60和40份,炭黑N330用量为55份,炭黑N550用量为12份,己二酸二辛酯用量为7份,硫黄和促进剂用量为1.8份（硫黄、促进剂CBS和促进剂TMTD用量分别为0.3,1和0.5份）。该组合配方的NBR胶料的拉伸强度达到22.6MPa,海水老化后拉伸强度变化率（绝对值,后同）和拉断伸长率变化率以及油浸泡后体积变化率较小,该组合配方胶料的性能满足柔性接头内部弹性体的性能要求。     

矿井胶布用阻燃抗静电胶料的开发

以丁腈橡胶（NBR）和氯丁橡胶（CR）和NBR/聚氯乙烯橡塑合金单用或者并用作为主体材料,以硼酸锌、氢氧化铝、聚磷酸铵和氧化锑等并用作为协同阻燃体系,以抗静电剂XS和导电钛白粉并用作为抗静电体系,经过优化配方设计,开发出矿井胶布用阻燃抗静电胶料。结果表明：NBR/CR并用矿井胶布用阻燃抗静电胶料可满足胶布压延及硫化工艺要求,综合性能较好,阻燃性能和抗静电性能均满足矿井相关标准要求。     

RCAD2003配方优化系统在NBR密封制品配方研究中的应用

运用RCAD2003配方优化系统对NBR密封制品配方进行研究。对于三变量配方，仅用8次试验即可通过优化得到综合性能满足要求的配方。另外，利用本系统考察了丙烯酸锌对NBR与金属骨架材料粘合性能的影响。实测结果表明，丙烯酸锌的加入大大提高了胶料与金属骨架材料的粘合强度。     

NBR/EVM并用胶料的性能研究

文中主要研究了NBR/EVM(丁腈橡胶/乙烯醋酸乙烯酯)不同配比共混胶料的力学性能、耐老化性能、耐油性能、耐低温性能,耐高温性能和硫化特性.结果表明,随着EVM含量的增加,NBR/EVM硫化胶的拉伸强度、拉断伸长率、回弹性和压缩永久变形有明显改善,硬度和100％定伸应力呈下降趋势;脆性温度明显降低,显著改善了低温性能;耐老化性能得到改善;耐油性能下降.热失重分析表明,EVM明显改善了NBR胶料的耐高温性能.对硫化体系的研究表明,NBR/EVM并用胶料适合用过氧化物硫化.     

丁腈橡胶和氢化丁腈橡胶(三)

4.4硫化胶的性能 丙烯腈系橡胶最重要的特性是耐油.NBR的许多特性很大程度上取决于聚合物中丙烯腈的含量.表15为不同丙烯腈含量的NBR未硫化胶和硫化胶的性能(胶料配方相同,硫黄硫化)[54].     

无卤阻燃型EPDM材料和EPDM/PP TPV复合材料等胶料性能的研究进展

EPDM应用广泛但容易燃烧,在许多应用中需添加阻燃剂。含卤体系阻燃剂虽然阻燃性好但易释放有毒气体,因此无卤阻燃剂获得了普遍应用。研究了无卤阻燃剂与EPDM等橡胶的复合性能,介绍了橡胶阻燃机理和电线电缆等方面胶料,如天然胶、EPDM、CR、NBR的配方及材料性能。     

植物基环保橡胶油在丁腈橡胶中的应用

将自制植物基环保橡胶油(PBRO)应用于丁腈橡胶(NBR)中,研究PBRO用量对NBR胶料性能的影响,并与相同用量石蜡油、环烷油、芳烃油和邻苯二甲酸二辛酯(DOP)进行对比。结果表明:当PBRO用量为25份时,NBR胶料的硫化特性、物理性能、耐热老化性能、耐油性能和耐寒性能较好;添加PBRO的NBR胶料物理性能、耐老化性能、耐油性能和耐寒性能与添加芳烃油和DOP的NBR胶料相近,其中添加PBRO的NBR胶料的耐热老化性能、耐油性能和热稳定性能略好。     

耐低温减振橡胶的研制与应用

从生胶、增塑剂、硫化体系和炭黑类型等方面着手,探讨了配方各组分对NR低温性能的影响。结果表明,与顺丁橡胶(BR)并用能有效降低胶料玻璃化转变温度;使用半有效硫化体系,控制单双硫键比例和提高交联密度对改善胶料耐低温性有积极作用;采用己二酸二辛酯(DOA)与低相对分子质量1,2-聚丁二烯(Ricon 130)并用可产生协同作用,有效降低玻璃化转变温度并抑制低温结晶;使用粗粒径炭黑N774能适当提高胶料低温回弹性。开发出的耐低温配方胶料用于高寒地区橡胶垫板类产品,其-50℃低温刚度变化率≤20%,满足技术要求。     

Vulcanization characteristics and mechanical properties of nitrile rubber filled with short leather fibres

Leather shavings have been used as filler in short fibre form for nitrile rubber reinforcement. Shavings neutralized with sodium bicarbonate and ammonia showed improved vulcanization characteristics and mechanical properties, whereas sodium hydroxide neutralized shavings exhibited poor properties. Swelling of the vulcanizates in water and 1% NaOH was found to increase with leather loading, whereas in MEK a reversed trend was observed. Thermogravimetric analysis indicates that the thermal stabilities of the vulcanizates fall between those of pure leather and gum nitrile rubber vulcanizate.     

铑-钌双金属配位催化剂氢化丁腈橡胶的流变性能

研究了铑-钌双金属配位催化剂体系制备的氢化丁腈橡胶(HNBR)的相对分子质量及其分布、剪切应力与剪切速率的关系、表观黏度与剪切速率的关系、表观黏度与温度的关系以及口型膨胀情况。结果表明,制备的HNBR的加工流变行为具有较高的剪切速率敏感性和很低的加工温度敏感性,且其加工流变行为与已工业化生产的国外同类产品相当。     

无规羧基丁腈橡胶改性环氧树脂

介绍以无规羧基丁腈橡胶为增韧剂，用三乙醇胺、低分子量聚酰胺等为固化剂改善环氧树脂阻尼性能的方法。利用扫描电子显微镜等研究了环氧树脂／丁腈橡胶体系的微观结构形态以及橡胶种类、用量等对增韧效果的影响。     

耐低温橡胶的研究进展

综述了耐低温橡胶的研究进展,主要对氟橡胶、硅橡胶、丁腈橡胶、丙烯酸酯橡胶和聚氨酯橡胶的耐寒性性能及其改良方法进行了介绍,总结了目前提高橡胶耐低温性能的主要途径及对未来的发展方向提出一些看法,为制备耐低温橡胶提供参考。     

Toughening modification of (Acrylonitrile‐styrene‐acrylic copolymer)/(α‐Methylstyrene‐acrylonitrile copolymer) binary blend via using different impact modifiers

In this work, different impact modifiers such as acrylic resin impact modifier, chlorinated polyethylene (CPE), nitrile rubber, powdered nitrile rubber, and hydrogenated nitrile rubber, were chosen to improve the toughness of (acrylonitrile‐styrene‐acrylic copolymer)/(α‐methylstyrene‐acrylonitrile copolymer) (ASA/α‐MSAN) binary blend. The blend ratios of the ASA/(α‐MSAN)/(impact modifier) ternary system were 30/70/20 and 70/30/20 by mass, respectively. The results showed that the impact strength significantly increased, nearly 30 times (22.59 kJ·m^?2, 22.26 kJ·m^?2, and 25.24 kJ·m^?2) compared with that of control samples (0.80 kJ·m^?2) when nitrile rubber, powdered nitrile rubber, or hydrogenated nitrile rubber was added to the ASA/(α‐MSAN) (30/70) matrix, respectively. Moreover, the impact strength of ASA/(α‐MSAN) (70/30) was dramatically enhanced to 46 kJ·m^?2 with the addition of 20 parts by weight per hundred parts of resin of chlorinated polyethylene. The toughness of ASA/(α‐MSAN) with or without impact modifiers was also characterized via fracture energy calculated from stress‐strain curves. The results were perfectly consistent with that of impact strength. The results of dynamic mechanical analysis demonstrated the existence of α‐MSAN (glass transition temperature at approximately 140°C). The heat distortion temperature was barely changed, indicating the addition of impact modifiers barely affects the heat resistance. J. VINYL ADDIT. TECHNOL., 22:326–335, 2016. © 2014 Society of Plastics Engineers     

原油对丁腈橡胶密封件性能的影响

以原油为试验介质,模拟井况研究原油对丁腈橡胶密封件性能的影响。结果表明,在模拟井况条件下,丁腈橡胶密封件出现老化现象,随着浸泡时间的延长,密封件的拉伸强度和扯断伸长率逐渐下降,硬度逐渐增大,老化机理以分子链交联老化反应为主;随着温度的升高,老化速率快速增大;高含水率的原油对丁腈橡胶密封件的性能存在负面影响。     

硫化体系对氢化丁腈胶热氧老化性能的影响

系统研究了不同硫化体系对氢化丁腈胶（HNBR）力学性能和热氧老化性能的影响。结果表明：采用过氧化物/硫磺（S）体系得到的胶料其综合性能优于过氧化物体系得到的胶料,在100份HNBR中加入5份过氧化二异丙苯（DCP）和0.5份S,即DCP与S并用时,硫化胶拉伸强度可以达到23.85 MPa,在160℃×72 h热氧老化后仍可以达到20.99 MPa。热氧老化性能以DCP/S为7/0.5时最为优异。     

密封橡胶在硝酸异丙酯中的溶胀性能分析

丁腈橡胶作为硝酸异丙酯的密封材料,常常会发生硝酸异丙酯的渗漏挥发现象。为选择新的橡胶代替丁腈橡胶密封硝酸异丙酯,本文制备了丁腈橡胶与三元乙丙橡胶试样,测试经溶胀后丁腈橡胶与三元乙丙橡胶的质量与体积变化率、组织结构、表面形貌、力学性能,并对比了丁腈橡胶与三元乙丙橡胶溶胀后的性能。结果表明：丁腈橡胶与三元乙丙橡胶在硝酸异丙酯中溶胀后各方面性能均有所下降,但是三元乙丙橡胶溶胀后的性能要强于丁腈橡胶,显示出更好的耐硝酸异丙酯性能,建议使用三元乙丙橡胶并喷涂酚醛树脂液体密封胶密封硝酸异丙酯。     

Reusable Dry Adhesive: Aluminium-Aluminium Bonding by Self-Vulcanisable Blend Based on Carboxylated Nitrile Rubber and Chlorobutyl Rubber

A self-vulcanisable blend of chlorobutyl rubber and carboxylated nitrile rubber can be used as an adhesive for aluminium-aluminium bonding. The peel strength depends on the state of cure of the adhesive, testing temperature and carboxyl content of the carboxylated nitrile rubber. At moulding times below 15 minutes, the adhesive was found to be reusable after repeated post-peel mouldings.     

Reusable Dry Adhesive: Aluminium-Aluminium Bonding by Self-Vulcanisable Blend Based on Carboxylated Nitrile Rubber and Chlorobutyl Rubber

A self-vulcanisable blend of chlorobutyl rubber and carboxylated nitrile rubber can be used as an adhesive for aluminium-aluminium bonding. The peel strength depends on the state of cure of the adhesive, testing temperature and carboxyl content of the carboxylated nitrile rubber. At moulding times below 15 minutes, the adhesive was found to be reusable after repeated post-peel mouldings.