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考察了3种不同环保软化剂(环保芳烃油、塔尔油-木焦油精制型环保橡胶软化剂LGG、棕榈油)对废旧轮胎胶粉再生橡胶性能的影响,并通过傅里叶变换红外光谱表征了再生橡胶。结果表明,随着软化剂用量的增加;再生橡胶的交联密度和门尼黏度逐渐降低,溶胶含量逐渐增加;添加环保芳烃油的再生橡胶的硫化速率变化不大,添加LGG的再生橡胶的硫化速率下降,而添加棕榈油的再生橡胶的硫化速率呈现上升趋势;随着软化剂用量的增加,再生橡胶的拉伸强度下降,扯断伸长率先上升后下降,分别添加环保芳烃油和LGG的再生橡胶的拉伸性能优于添加棕榈油的再生橡胶,软化剂的最佳用量为10份;未添加软化剂的再生橡胶的储能模量远大于添加软化剂的再生橡胶,添加棕榈油的再生橡胶的储能模量和损耗因子低于分别添加环保芳烃油和LGG的再生橡胶;添加软化剂的再生橡胶在再生过程中形成了更多的双键,且发生了热氧老化反应。 相似文献
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以甲基丙烯酸十二酯(LMA)、甲基丙烯酸丁酯(BMA)为单体,采用悬浮聚合法合成高吸油树脂[P(LMA-g-BMA)]。采用LMA单体或P(LMA-g-BMA)为改性剂,以三元乙丙橡胶为基体制备吸油膨胀橡胶,并对其性能进行研究。结果表明:与采用吸油树脂为改性剂的吸油膨胀橡胶相比,采用LMA单体为改性剂的吸油膨胀橡胶吸油率较高,且当其用量为30份时,吸油膨胀橡胶的吸油率较高。与采用LMA单体为改性剂的吸油膨胀橡胶相比,采用吸油树脂为改性剂的吸油膨胀橡胶物理性能较优;当LMA与BMA质量比为1∶2,吸油树脂用量为20份时,吸油膨胀橡胶的物理性能降幅最小。 相似文献
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本文首先考察了环保油PAX和环保芳烃油对微波加热再生全胎胶粉的影响。结果表明:微波加热时,随着两种环保软化剂用量增多胶粉的温升速度和再生温度均降低,但提升了再生橡胶性能的均一性;环保油PAX用量在10份时和环保芳烃油用量在15份时所得再生橡胶性能最好,且应用环保油PAX的再生胶性能要优于应用环保芳烃油的再生胶。其次在环保油PAX中混入甘油,探究了环保软化剂中极性物质的含量对微波再生全胎胶粉的影响。结果表明:相同微波加热工艺下,环保油PAX中适量的加入甘油可以提高胶粉的温升速度和再生温度,所得再生橡胶的加工性能提高,力学性能略微降低;甘油量过多时,与全胎胶粉相容性差,致使后续加工实验无法进行。 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