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非轮胎橡胶制品用特色弹性体 Ⅲ.特殊EPDM、POE、EVM和AEM 总被引:2,自引:0,他引:2
介绍特殊品种EPDM、乙烯-辛烯弹性体(POE)、乙烯-乙酸乙烯酯橡胶(EVM)和羧基型丙烯酸酯橡胶(AEM)的特点和用途.茂金属气相法EPDM的门尼粘度较高,相对分子质量分布较窄,生胶强度高,广泛用于汽车密封条、胶管和防水卷材等;有机硅改性EPDM的耐热老化性能介于硅橡胶和EPDM之间,耐蒸汽性能、耐热水性能和耐酸碱性能均优于硅橡胶,可用于电缆护套和汽车散热器胶管等.POE最大的应用领域是汽车配件,可替代EPDM生产制动密封件、膜片、散热器胶管、密封条、套管和火花塞护套等.EVM具有优异的耐热、耐臭氧和耐候性能,同时具有一定的耐油性能和良好的低温柔顺性,主要用于电缆和汽车配件.AEM具有优异的耐热老化性能、耐液体性能、耐寒性能和抗压缩永久变形性能,主要用于汽车配件. 相似文献
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日前,吉林石化公司乙丙橡胶C装置年度首次切换牌号工作顺利完成,生产的X-3042新牌号产品指标合格,标志着该公司乙丙橡胶挤出型材用新产品工业化试验成功。X-3042是吉林石化为打开中压电线电缆领域,进一步提高市场占有率研究开发的高乙烯含量、低门尼粘度、中亚乙基降冰片烯含量的三元乙丙橡胶新牌号产品。 相似文献
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以双叔丁基过氧化异丙基苯为硫化剂,通过无转子硫化仪、毛细管流变仪及橡胶加工分析仪考察了炭黑用量对乙烯含量不同的2种三元乙丙橡胶(EPDM)混炼胶硫化特性、流变行为、动态黏弹性能及硫化胶拉伸性能的影响。结果表明,随着炭黑用量的增加,2种EPDM混炼胶的焦烧时间(ts1)均缩短,正硫化时间均变化不大,门尼黏度均逐渐增大,混炼胶黏-切依赖性增大; 在相同炭黑用量下,乙烯含量高的混炼胶的ts1较短,硫化程度和硫化速率提高,2种EPDM混炼胶均表现出剪切变稀行为,乙烯含量高的EPDM混炼胶的剪切弹性模量明显高于乙烯含量低的EPDM混炼胶; 随着炭黑用量的增加,2种EPDM硫化胶的拉伸强度和100%定伸应力均不断提高,且高乙烯含量有助于提高EPDM硫化胶的拉伸性能。 相似文献
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Solid solutions of diphosphates of zinc and copper and of zinc and cobalt were synthesized from mixtures of pure diphosphates at temperatures up to 1000°C. Their X-ray diffractometry patterns varied continuously from one end member to the other. Solid solutions of orthophosphates of composition Zn3−x Cox(PO4 )2, with x = 0.4–1.6, were formed at temperatures up to 950°C; all exhibited the structure of γ-Zn3 (PO4 )2. Solid solutions of orthophosphates of composition Zn3−x Cux (PO4 )2 exhibited more-complex behavior. At 1000°C and copper contents of 20–80 mol%, a phase that is related to Cu3 (PO4 )2, termed here the "ε-phase," predominated. At 850°–950°C and in the region from 20 mol% to ∼33 mol% of copper, the solid solutions (the "η-phase") adopted the structure of graftonite. At 800°–900°C and 10–15 mol% of copper, the solid solutions exhibited a new structure (the "δ-phase"), which we found to be related to the mineral sarcopside. At temperatures 950°C, the solutions that contained 5–15 mol% of copper (the "β-phase") had the structure of β-Zn3 (PO4 )2, whereas at 800°–850°C, solutions with 5 mol% of copper (the "-phase") exhibited the structure of γ-Zn3 (PO4 )2. Attempts to synthesize Cu+ ZnPO4 and Cu+ Cu2+ Zn3 (PO4 )3 were unsuccessful. 相似文献
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为了提高油田的生产效率,设计最佳的油气集输处理的工艺流程,更好地完成油气水分离处理的任务。对油气集输工艺技术进行优化,发挥高效油气水分离处理设备的优势,提高油气水处理的质量,保证油气集输工艺顺利实施,获得最佳的油田产量外输。 相似文献
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建设创新型国家是我们中华民族的历史责任。“自主创新、重点突破、支撑发展、引领未来”的16字方针应当成为我们未来创新活动的指南。建设创新型国家把自主创新放在首位,并提出了引领未来的高标准要求。钢铁科技创新必须突出重点,抓住创新成果产业化这个关键,支撑起行业和国民经济的发展。 相似文献
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相比已经完善丰富的开采和勘探技术,油气的运输以及储存却仍然存在不足之处。我国对能源安全提出更加严格要求的同时,对区域经济的发展规划也有足够重视。因此,保障油气管道的安全则成为了我国能源安全战略的重中之重。在阐释油气管道现阶段在储运安全保障技术发展状况的基础上,分析了现存的问题及解决问题的手段,并指出未来可能使用的目标策略,为今后研究者提供一定程度上的借鉴经验。 相似文献
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膜的污染和劣化及其防治对策 总被引:25,自引:0,他引:25
较为系统地介绍了膜污染和劣化的定义和特点,因膜污染和劣化而造成的膜性能变化,以及如何预防、减少或清除膜污染和劣化的一些通用方法。 相似文献
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James L. White David G. Salladay David O. Quisenberry Donald L. MacLean 《应用聚合物科学杂志》1972,16(11):2811-2827
Gel permeation chromatographic (GPC) and thin-layer chromatographic (TLC) studies of polystyrene, polybutadienes (BR), and their copolymers (SBR) have been carried out. GPC primarily separates them on the basis of molecular size, and TLC, on the basis of composition. Methods of obtaining absolute molecular weight distributions for BR and SBR based upon variations of the Strasbourg Universal Calibration procedure are described. In particular, [η]–M relationships in both the GPC solvent (THF) and in a second solvent (toluene) were used; in addition, results of statistical mechanical calculations for \documentclass{article}\pagestyle{empty}\begin{document}$\overline {s^2 }$\end{document} (based on the assumption of negligible steric hindrance and freely rotating bonds) were applied. An experimental comparison of these methods was carried out, and use of the [η]–M relationships for both solvents was found to give satisfactory results. The predictions of the statistical theory were too low. A detailed study of polymer–solvent–gel interaction in the GPC unit was made through investigation of ternary phase equilibrium in the (polystyrene)–THF–(polymer) system. The polymers studied included BR and SBR with varying styrene contents. Experimental techniques for TLC separations of BR, SBR, and polystyrene according to the composition are described. 相似文献