共查询到19条相似文献,搜索用时 62 毫秒
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热硫化氟硅橡胶聚合动力学的研究 总被引:1,自引:0,他引:1
采用小型反应器对热硫化氟硅橡胶聚合动力学过程和热力学过程的特点进行了基础性研究。考查了聚合温度和初始引发剂浓度对热硫化氟硅橡胶聚合动力学的影响,并掌握了相关规律。 相似文献
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硅橡胶配合技术 总被引:9,自引:0,他引:9
1 前言硅橡胶是以聚硅氧烷为主链的弹性体 ,而聚硅氧烷则由 Si-O(硅 -氧 )键重复连接构成。硅橡胶用途广泛 ,除在汽车、电器和电子、办公机械三大领域应用外 ,还大量用于建筑、医疗、食品工业等方面 ,它属于特种橡胶范畴 ,但目前人们已将它当作通用橡胶使用。硅橡胶与天然橡胶及其它合成橡胶不同 ,一般不以生胶形式出售 ,在欧美国家多以母胶形式出售 ,也有以混炼胶方式销售 ,日本制造商则均按备用 ( Ready-use)形式供货。这是因为 ,在橡胶制品加工厂中硅橡胶制品一般品种多而批量小 ,而且用白炭黑作补强剂需要专用设备进行配炼加工 (以免… 相似文献
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研究了酮肟型室温硫化硅橡胶A、B及醋酸型室温硫化硅橡胶C(以下简称粘合胶A,粘合胶B,粘合胶C)3种室温硫化硅橡胶对氟硅橡胶硫化胶的粘合性能。结果表明:粘合胶B的粘合性能最佳,剥离强度可达3 kN/m以上,经燃油浸泡24 h后,剥离强度为2.1 kN/m,离油静置后恢复性能最好;粘合胶C的剥离强度为0,粘合胶A的剥离强度为1.1 kN/m,高于粘合胶C同时段剥离强度,但粘合面出现明显分层,浸泡一定时间后,粘合面发生脱离,丧失粘合能力。室温硫化硅橡胶粘合硫化后的氟硅橡胶效率高、成本低、操作方便,适用于不常接触油的特定场合,应用在某发动机周边,密封效果良好。 相似文献
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硅橡胶配合技术(续) 总被引:2,自引:0,他引:2
2.4 硅橡胶混炼胶的制备硅橡胶混炼胶的基本配炼程序如图 8所示。混炼硅橡胶的设备有密炼机、开炼机、捏炼机等 ,可根据产量、用途分别选用。与天然橡胶和其它合成橡胶相比 ,粘度低、凝聚力弱的硅橡胶生胶没有必要使用大功率炼胶机械 ,采用转速比小于合成橡胶用的开炼机就可方便地进行塑炼和混炼。此外 ,为避免混入异物 ,硅橡胶的混炼加工通常在专用的机械设备上进行。硅橡胶母炼胶 (不含硫化剂 )的加工与其它合成橡胶相比有两大不同点 :1为促进白炭黑与湿润剂的反应及除掉吸附的水分和低分子硅氧烷等低聚物 ,一般要将硅橡胶母炼胶置于1 50… 相似文献
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甲基乙烯基硅橡胶在非极性溶剂中有较大的膨胀.为了提高硅橡胶的耐非极性溶剂的性能,科研人员采用了全氟化液体硅橡胶.此橡胶通过注射成型工艺模压成制品,其耐燃料性能与氟硅橡胶相似,经高温老化后硬度稍有提高.液体氟硅橡胶可应用在汽车制造和航空工业中. 相似文献
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Sanjoy Datta Radek Stoček Ivo Kuřitka Petr Sáha 《Polymer Engineering and Science》2015,55(6):1450-1458
The present work deals with reverse engineering on four rubber formulations. Information about the material composition of the compounding formulations was obtained by using techniques such as acetone extract, thermogravimetric analysis, energy dispersive X‐ray fluorescence studies, and Fourier transform infrared (FTIR) spectroscopy in attenuated total reflection mode. The reverse engineered formulations were compared on a qualitative and quantitative basis with the initial formulations. The aim was to ascertain the validity of the methodology, which may be used as reverse engineering of rubber compounds to quantitatively analyze unknown ground tire rubber in future. The state of the art was based on a fractional mass transfer from acetone extract to the rubbers detected in TGA. Through this new approach, the formulations calculated were very consistent with the formulations employed, thus establishing the validity of the methodology used. POLYM. ENG. SCI., 55:1450–1458, 2015. © 2015 Society of Plastics Engineers 相似文献
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The effect of ceria nanoparticles on improving heat resistant properties of fluorosilicone rubber 下载免费PDF全文
The thermal aging behavior of poly(3,3,3‐trifluoropropyl)methylsiloxane was investigated by thermal gravimetric analysis and isothermal aging tests, and the results indicated the degradation mechanism II, oxidation scission of the side groups, played a more important role when the temperature was below 350 °C. The addition of ceria had significantly improved the thermal stability of fluorosilicone rubber (FSR) by inhibiting the oxidation scission. Moreover, two types of ceria including laminar‐structure ceria (LS‐CeO2) and nanoparticle ceria (N‐CeO2) were prepared and surface was modified by KH570 and characterized by scanning electron microscopy, transmission electron microscope, and X‐ray diffractometer. FSR incorporated with modified LS‐CeO2 and N‐CeO2 revealed a significant improvement on the heat resistant properties. In particular, after having been thermal oxidative aged for 70 h at 250 °C, FSR containing 2 wt % of modified N‐CeO2 maintained 72.6% of tensile strength and 63.9% of elongation at break, respectively, while FSR without ceria completely failed. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 44117. 相似文献
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粗略回顾了开炼机、密炼机和挤出机的混炼工艺技术的基本概况,介绍了聚合物原料的性能及投料形状对混炼工艺的影响。深入细致地分析了混炼中各种参数的设定。运用流变学理论,指导密炼机转子断面几何形状的设计,提出凸棱功能技术(WFT)和Coflow密炼机。指出使用同向旋转啮合式双螺杆挤出机可使连续加工成为可能。 相似文献
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