动态硫化法丁腈橡胶/尼龙12热塑性弹性体的制备及性能

采用动态硫化法制备了丁腈橡胶(NBR)/尼龙(PA)12热塑性弹性体(TPE),通过Haake密炼机确定了动态硫化时间,表征了TPE的相态结构,考察了NBR/PA12(质量比)、增塑剂种类对TPE性能的影响,并对TPE进行了热分析。结果表明,适宜的动态硫化时间为10 min;TPE具有以PA 12为连续相、NBR为分散相的两相结构;随着PA12用量的增加,TPE的拉伸强度和耐油性能有很大的提高,但邵尔A硬度和压缩永久变形也增大,扯断伸长率先减小后又增大,适宜的NBR/PA12为70/30~60/40;邻苯二甲酸二辛酯、液体丁腈橡胶、聚己二酸丙二醇酯3种增塑剂的加入均可降低TPE的邵尔A硬度,提高扯断伸长率,但对耐油性能的影响不大;TPE的熔点高于PA12,熔融焓低于PA12。     

NBR/PA6 TPV的制备与性能研究

文中对由丁腈橡胶（NBR）和尼龙6（PA6）制成的全动态硫化热塑性弹性体（TPV）的硫化体系进行了探索,就不同硫化体系考察了动态硫化NBR/PA6热塑性弹性体的性能。通过加入羧基丁腈橡胶（XNBR）提高了两相的相容性,对橡胶相和塑料相分别使用了高密度氧化聚乙烯蜡（AC-316A）和正丁基苯磺酰胺增塑剂,讨论了硫化体系、增容组分、增塑剂对热塑性弹性体材料微观相结构、宏观力学性能、流变性能、尼龙相结晶和动态力学性能的影响。     

用双螺杆挤出机制备丁腈橡胶/尼龙12热塑性弹性体

采用双螺杆挤出机通过动态硫化法制备了丁腈橡胶/尼龙12热塑性弹性体,考察了双螺杆挤出机的螺杆转速和机筒温度对所制备热塑性弹性体力学性能和微观形态的影响。结果表明,用双螺杆挤出机动态硫化制备的丁腈橡胶/尼龙12热塑性弹性体呈两相"海岛结构",即丁腈橡胶为分散相、尼龙12为连续相。随着挤出机螺杆转速的提高,弹性体的硬度、拉伸强度和扯断伸长率先增大后减小,撕裂强度和压缩永久变形逐渐降低;螺杆转速对弹性体耐油性能的影响不大;当螺杆转速增至400 r/min时,丁腈橡胶的粒径较小且分布均匀。随着双螺杆挤出机温度的升高,弹性体的硬度和拉伸强度逐渐增大,扯断伸长率、撕裂强度和压缩永久变形均先增大而后减小,耐油性能变差;温度升高使得丁腈橡胶难于在剪切作用下破碎,颗粒变大且分布不均。     

丁腈橡胶/尼龙热塑性弹性体结构性能的研究

采用动态硫化法制备了丁腈橡胶/三元尼龙/二元尼龙三元共混型热塑性弹性体.用TEM,DSC对其相态进行了研究.实验发现,二元尼龙的加入可显著提高该热塑性弹性体的耐溶剂性,而且其物理机械性能较佳.     

动态硫化溴化丁基橡胶/三元共聚尼龙热塑性弹性体力学性能的影响因素

采用动态硫化法制备了溴化丁基橡胶/三元共聚尼龙热塑性弹性体(BIIR/CO-PA TPV),考察了硫化体系、增容剂、橡塑比、硫化温度、返炼次数对BIIR/CO-PA TPV力学性能的影响,并对TPV脆断面的微观形貌进行了观察。结果表明,无论采用过氧化二异丙苯还是ZnO为硫化体系,BIIR混炼胶的硫化效果均较好。添加增容剂可以改善BIIR与CO-PA的相容性,提高TPV的力学性能;马来酸酐接枝乙烯-辛烯共聚物与氯化聚乙烯的增容效果相当。橡塑比(质量比)为7∶3~6∶4、硫化温度为180℃时,制备的TPV力学性能最好。随着返炼次数的增加,TPV的力学性能降低。     

ACM/PA6耐油热塑性弹性体的制备及性能

研究了不同硫化体系、硫化剂含量及橡塑比对动态硫化丙烯酸酯橡胶/尼龙6(ACM/PA6)热塑性弹性体加工性能、力学性能和耐油性的影响。结果表明:3号硫化剂(N,N-二次肉桂基-1,6-己二胺)作为硫化剂最合适,其用量为2 phr或橡塑比为70/30时,热塑性弹性体性能最好。     

丁腈橡胶/聚酰胺热塑性弹性体的制备及性能

采用Haake密炼机工艺、开炼机工艺和开炼机预混-Haake密炼机工艺制备了丁腈橡胶（NBR）／聚酰胺（PA）热塑性硫化胶（TPV）,研究了NBR／PATPV的结晶结构及其性能。结果表明,采用开炼机预混-Haake密炼机工艺可制得相态结构均匀、分散相粒径较小、力学性能和耐溶剂性能较好的NBR／PATPV。在NBR／PATPV中,NBR可诱发PA结晶。PA连续相结晶结构分布的均匀性和相界面之间的相互作用是提高NBR／PATPV耐溶剂性能的主要因素。     

丁腈橡胶／PVC型动态硫化热塑性弹性体性能研究

利用开炼机,通过动态硫化法制成的共混物丁腈橡胶／ＰＶＣ型热塑性弹性体（ＴＰＥ）,经透射电镜观察,呈现出明显的两相结构,交联的丁腈橡胶分散相分散于ＰＶＣ连续相中。共混物的力学性能受硫化体系和加工条件的影响。永久压缩变形、永久拉伸断裂变形、耐油等主要性能均优于简单机械共混物。     

羧基丁腈橡胶/PA12热塑性弹性体的制备及性能研究

通过动态硫化法制备了羧基丁腈橡胶/聚酰胺12(XNBR/PA12)热塑性硫化橡胶(TPV),考察了XNBR羧基含量和XNBR/PA12橡塑比(质量比,下同)对TPV力学性能、流变性能、耐油性能和耐热空气老化性能的影响.结果表明,随着橡塑比的增大,TPV力学性能先上升后下降;当XNBR羧基含量为7％(质量分数,下同)、橡...     

动态硫化丁腈橡胶/聚丙烯热塑性弹性体的耐油性能

研究了不同相容剂、硫化体系、增塑剂以及成型温度对动态硫化丁腈橡胶／聚丙烯热塑性弹性体(NBR／PPTPV)耐油性能的影响。结果表明,当端氨基液体丁腈橡胶(ATBN)为5份,马来酸酐接枝聚丙烯(MP)为10份时,ATBN／MP增容的TPV具有优异的耐油性能;酚醛树脂硫化TPV的耐油性能比过氧化二异丙苯(DCP)、溴化树脂硫化的TPV都要优越;聚酯增塑TPV的耐油性能优于邻苯二甲酸二辛酯(DOP)增塑的TPV;热成型温度对TPV的耐油性能影响不大。     

丁腈橡胶/聚酰胺热塑性硫化胶的制备

用橡塑预混法、二步法和母炼胶法制备了丁腈橡胶／聚酰胺热塑性硫化胶(NBR／PATPV),研究了3种工艺对NBR／PATPV相态结构、流变性能、物理机械性能和耐溶剂性能的影响。结果表明,NBR与PA在高温、高剪切作用下,两相界面之间可发生微化学反应,但并不影响动态硫化时两相之间的相态反转过程。用橡塑预混法可制得分散相粒径小且分布均匀的TPV,该TPV的100％定伸应力大,压缩永久变形小,耐溶剂性能不佳,表观黏度略大,但挤出物外观光滑。     

硫化体系对氯化丁基橡胶/尼龙12动态硫化胶性能的影响

研究了氧化锌、N,N’-间苯撑双马来酰亚胺(HVA-2)/氧化锌和1,3-双柠糠酰亚胺甲基苯(PK 900)/氧化锌3种硫化体系下氯化丁基橡胶(CIIR)/尼龙(PA)12混炼胶的硫化特性及CIIR/PA 12动态硫化胶(TPV)的物理机械性能和微观相结构,并考察了PK 900与氧化锌不同配比对CIIR/PA 12TPV物理机械性能、流变性能及微观相结构的影响。结果表明,PK 900/氧化锌的硫化速率介于氧化锌和HVA-2/氧化锌两者之间,由其制备的TPV橡胶相粒径为1～2μm,均匀分布在树脂相中,物理机械性能最优;固定PK 900用量为3份时,随着氧化锌用量的减少,CIIR/PA 12 TPV的拉伸强度、扯断伸长率和100%定伸应力均呈现先增大后减小的趋势;当PK 900/氧化锌(质量比)为3/5时,CIIR/PA 12TPV的物理机械性能最佳,且呈现低剪切速率高黏度、高剪切速率低黏度的特性。     

Ionic elastomers based on carboxylated nitrile rubber and magnesium oxide

The crosslinking of carboxylated nitrile rubber (XNBR) with magnesium oxide (MgO) leads to an ionic elastomer with thermoplastic nature and better physical properties than the ones obtained with other metallic oxides. The crosslinking reaction leads to the formation of a metallic salt as unique product, as it could be seen on the ATR analysis of the samples, prepared at different reaction times. The mechanical properties of the material increase with the amount of crosslinking agent and segregation of an ionic microphase takes place. The presence of this microphase is demonstrated by a relaxation at high temperatures. The apparent activation energy of this relaxation is smaller than the activation energy of the glass transition of the elastomer, the former being more dependent on the amount of metallic oxide than is the latter. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1894–1899, 2007     

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。     

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     

羧基丁腈橡胶的硫化性能

用无硫硫化体系、低硫高促进剂硫化体系、普通硫黄硫化体系、过氧化物硫化体系、金属氧化物硫化体系和硫黄／金属氧化物硫化体系对羧基丁腈橡胶（XNBR）进行了硫化,研究了XNBR的硫化性能、物理机械性能、耐老化性能、压缩永久变形和耐油性能。结果表明,采用普通硫黄硫化体系、硫黄／金属氧化物硫化体系所得到的XNBR硫化胶的综合物理机械性能较好;用无硫硫化体系、低硫高促进剂硫化体系和硫黄／金属氧化物硫化体系所得到的XNBR硫化胶的耐老化性能较好;用硫黄／金属氧化物硫化体系所得到的XNBR硫化胶的耐磨性、压缩永久变形较好;用普通硫黄硫化体系和硫黄／金属氧化物硫化体系所得到的XNBR硫化胶的耐油性能较好。     

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.