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环氧丙烯酸酯改性光固化水性聚氨酯的合成及性能研究 总被引:2,自引:1,他引:2
采用环氧丙烯酸酯(PPG-EA)、甲苯-2,4-二异氰酸酯(TDI)、聚丙二醇(PPG)、二羟甲基丙酸(DM-PA)和丙烯酸羟乙酯(HEA)等制备了环氧丙烯酸酯改性光固化水性聚氨酯乳液(WPU);研究了改性环氧丙烯酸酯用量、DMPA用量、n(—NCO)∶n(—OH)对乳液及涂膜性能的影响。结果表明:通过环氧丙烯酸酯改性的水性聚氨酯涂膜具有硬度高、耐水性和力学性能好的特点,并且克服了环氧树脂直接用于水性聚氨酯改性制备的乳液贮存稳定性差的不足。当改性环氧丙烯酸酯用量为6%-10%、DMPA用量为5.5%-7.5%、n(—NCO)∶n(—OH)为1.3-1.4时,UV固化水性聚氨酯乳液的综合性能较好。 相似文献
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单组分环氧树脂胶粘剂的研究现状 总被引:10,自引:0,他引:10
综述了单组分环氧树脂胶粘剂的发展现状,介绍了湿气固化型、微胶囊包覆型、潜伏性固化剂型以及阳离子光固化等类型的单组分环氧胶的研究进展,重点讨论了潜伏性固化剂型环氧胶的改性方法及效果。 相似文献
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水性聚氨酯涂膜耐水性影响因素研究 总被引:2,自引:0,他引:2
以聚酯多元醇、甲苯二异氰酸酯为主要原料合成了水性聚氨酯乳液。研究了NCO/OH值、亲水扩链剂DMPA及交联剂TMP的用量、硬段软段质量比对乳液涂膜耐水性的影响,获得了较优的实验配比;研究了环氧树脂、蓖麻油、有机硅对水性聚氨酯的改性,实验表明,改性后的水性聚氨酯涂膜的耐水性能得到较大的提高。 相似文献
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亚胺改性环氧树脂胶黏剂的研究 总被引:1,自引:1,他引:0
采用端羧基亚胺中间体对环氧树脂进行改性,用芳香胺做固化剂,制备了亚胺改性环氧树脂胶黏剂.研究了端羧基亚胺中间体的种类及用量、固化剂种类及用量、固化条件等因素对胶黏剂性能的影响.结果表明,采用分子中含有砜基的亚胺中间体对环氧进行改性、用DDS做固化剂制得的胶黏剂的性能最好.亚胺中间体用量为60phr~70phr、固化剂用量控制在固化剂活泼-H/环氧基为0.6~0.7时,胶黏剂的综合性能较好.适合该胶黏剂的固化条件为200℃/2h 220℃/4h. 相似文献
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水性环氧改性聚氨酯清漆的研制 总被引:5,自引:0,他引:5
以聚氨酯与环氧树脂接枝合成出环氧改性聚氨酸乳液,讨论了n(NCO)/n(OH)值、环氧树脂加入量及异氰酸根残留量对产品性能的影响,制得的水性环氧改性聚氨酯清漆的综合性能良好。 相似文献
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聚氨酯改性室温固化环氧结构胶粘剂的研究 总被引:1,自引:1,他引:0
采用聚氨酯预聚体改性环氧树脂,制备了高性能室温固化环氧结构胶粘剂,研究了聚氨酯预聚体加入量对环氧结构胶剪切强度、冲击强度和拉伸强度等指标的影响,利用扫描电镜(SEM)对环氧胶固化物的冲击断裂面进行了分析。结果表明,聚氨酯预聚体的加入可显著提高环氧胶粘剂的韧性。采用NCO质量分数为3.86%的甲苯二异氰酸酯/聚醚多元醇预聚体(TDI/N220)改性环氧树脂,加入量为20 g/(100 g环氧树脂)时,环氧结构胶粘剂的综合性能最佳,剪切强度为20.8 MPa,冲击强度为44.2 kJ/m2,拉伸强度为17.4 MPa。 相似文献
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有机硅环氧树脂对聚氨酯防水涂料结构和耐水性能的影响 总被引:1,自引:0,他引:1
以二甲基硅油和环氧树脂对聚氨酯进行复合改性,制备改性聚氨酯防水涂料。通过红外光谱和扫描电镜对改性聚氨酯涂膜进行了表征,研究了n(─NCO)/n(─OH)比值、二甲基硅油和环氧树脂质量分数对涂膜吸水率的影响。结果表明,当n(─NCO)/n(─OH)=2:1、二甲基硅油和环氧树脂含量分别为8%和7%(均为质量分数)时,所制备的有机硅环氧改性聚氨酯涂料的耐水性能最佳,涂膜的拉伸强度为12.02 MPa,抗冲击强度50 kg.cm,吸水率11.37%,附着力1级。 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