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丙烯酸(r1)-丙烯酸钠(r2)共聚竞聚率的研究 总被引:4,自引:0,他引:4
丙烯酸(r1)-丙烯酸钠(r2)共聚反应,在较低转化率(〈10%)的条件下,依据特征峰的差异,采用红外光谱法确定共聚组成,然后以3种不同计算方法计算两组分竞聚率。经过研究,确定竞聚率r1=0.878,r2=0.569。 相似文献
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通过使用复合型乳化剂,成功地剂备了SL型农田袜用粘合剂,并确定了配方和生产工艺,该粘合剂性能优良,完全能满足农田袜生产的需求。 相似文献
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丙烯酸羟丙酯是重要精细化工产品。文章介绍了由环氧丙烷与丙烯酸反应的合成工艺条件,着重讨论了催化剂品种及选择。同时对丙烯酸羟丙酯应用领域作了简单介绍。 相似文献
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《涂料技术与文摘》2003,24(2):42-43
0302001残留单体含量低的丙烯酸乳液及其制备和含该乳液的涂料:JP2002一2 1 2 207旧本专利公开]/日本:NIPPon Paint Co。Ltd.(Hisawatari,W血kana等)一2002.7.31一6页一2001/7 445(2001.1.16):IPCC08F2/24 将含(甲基)丙烯酸C4 18烷基醋的烯属不饱和单体混合物在自由基引发剂存在下聚合,然后在含有机过氧化物的氧化还原引发剂存在下聚合,制得(甲基)丙烯酸C4一!8烷基醋残量(0.1%的丙烯酸乳液。含该丙烯酸乳液且挥发分含量低的涂料适用于建筑内部结构等。例如,将苯乙烯20刀份、甲基丙烯酸甲醋54份、丙烯酸2一乙基己醋69.0份和甲基丙烯… 相似文献
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新型抑垢分散剂—丙烯酸/丙烯酸羟丙酯共聚物 总被引:1,自引:0,他引:1
本文概述了水处理剂的发展及现状,结合笔者的工作简述了丙烯酸/丙烯酸羟丙酯共聚物的合成,并对共聚物的分子量及其分布、两种单体在共聚物中的摩尔比与其分散性能的关系进行了初步探讨,同时介绍了新型抑垢分散剂丙烯酸/丙烯酸羟丙酯共聚物的应用及原理。 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