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文章综述了MMA防水涂料、MMA彩色防滑路面、MMA地坪涂料和MMA混凝土修复材料等系列产品的研究进展情况。 相似文献
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甲基丙烯酸甲酯的生产与市场 总被引:3,自引:0,他引:3
甲基丙烯酸甲酯(MMA)的生产方法有5种,其中异丁烯氧化法被认为是最具竞争力的工艺之一。国外MMA的生产主要集中在欧、美、日。英国ICI是世界上最大的MMA生产商,其总的生产能力占世界总能力的22%,美国Rohm&Hass是世界上第二大MMA生产商。国内MMA的主要生产厂家是黑龙江龙新化工有限公司和抚顺有机玻璃厂,但生产规模均较小,1998年国内MMA的生产能力为6万t/a。由于MMA是高技术资本密集型产品,而国内由于技术、原材料、规模等原因使得产品成本非常高,严重影响市场开拓,同时大量的国外产品不断向我国倾销,严重冲击了国内MMA的生产,迫使许多厂家停产。预计在未来MMA将具有广泛的应用前景,因此,利用异丁烯氧化技术引进或合资建成1—2套具有经济规模的MMA装置很有发展前途。 相似文献
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简介甲基丙烯酸甲酯(MMA)的产能分布、市场情况,重点阐述MMA的几种主流生产工艺——丙酮氰醇法、异丁烯法、乙烯法、烯醛法、改进型丙酮氰醇法,并对各类装置的物料消耗、投资、成本进行了对比,提出了推进我国MMA产业突破技术瓶颈的相关建议。 相似文献
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国内外甲基丙烯酸甲酯产业发展前景分析 总被引:3,自引:0,他引:3
阐述了甲基丙烯酸甲酯(MMA)的国内外生产、需求状况及国内各主要应用领域PMMA、涂料、ACR和MBS等对MMA的消费情况,分析了我国MMA产业目前存在的问题,提出了发展建议。 相似文献
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甲基丙烯酸甲酯的合成及技术进展 总被引:2,自引:0,他引:2
综述了甲基丙烯酸甲酯(简称MMA)的几种工业生产技术,涉及丙酮氰醇法、乙烯法、异丁烯法、丙炔法、丙烯法和异丁烷法。讨论了甲基丙烯酸甲酯的国际、国内市场及其前景。阐明了MMA的国内市场发展空间在今后几年前景广阔,以及国内建设较大规模、技术先进、有较强竞争力的MMA生产装置的必要性。 相似文献
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《化工科技》2015,(5)
以甲基丙烯酸甲酯(MMA)为单体,在c(乳化剂)=2mmol/L下制备乳液,研究不同w(MMA)对MMA乳液聚合成核的影响,并分析了不同w(MMA)对乳胶粒粒径的影响规律。实验结果表明:当w(MMA)≤10%,随着w(MMA)的增加转化率逐渐增大,乳胶粒的生成速率也逐渐增大;当w(MMA)≥10%时,转化率可以达到70%以上,w(MMA)对乳胶粒的生成速率的影响不大,多余的单体用于乳胶粒粒径的增长;在w(MMA)=10%时基本能够满足c(乳化剂)=2mmol/L时的成核要求。当5%≤w(MMA)≤30%,在乳化剂的自调节作用下,使得最终形成的乳胶粒数目相差不大。 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