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概述了传统聚氯乙烯增塑剂的种类以及聚氯乙烯增塑剂的增塑机制,重点介绍了几种环保聚氯乙烯增塑剂,分析了我国聚氯乙烯行业的现状以及聚氯乙烯增塑剂的发展前景。 相似文献
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综述了聚氯乙烯树脂的生产现状,分析了聚氯乙烯树脂目前的需求状况,阐述了聚氯乙烯树脂的发展趋势;预测了聚氯乙烯树脂的未来需求情况,并提出了聚氯乙烯树脂发展的几点建议。 相似文献
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介绍了 2 0 0 1年世界主要国家和地区聚氯乙烯市场和工业现状。在氯乙烯单体生产技术方面 ,叙述了以乙烯为原料使用四氯乙烯和四氯化碳作氯化剂生产氯乙烯的新工艺 ,干电解氯化氢转化为氯的新工艺 ,乙烷直接氧氯化生产氯乙烯的新技术 ;分析了国外大型聚氯乙烯公司生产氯乙烯单体的工艺特点及采用不同工艺生产氯乙烯的经济效益。在聚氯乙烯树脂生产技术方面 ,总结了连续悬浮聚合氯乙烯新工艺 ,使用茂金属催化剂生产聚氯乙烯树脂的新技术 ;介绍了生产高表观密度聚氯乙烯树脂、消光聚氯乙烯树脂、聚氯乙烯 -聚 (N -异丙基丙烯酰胺 )接枝共聚物、聚氯乙烯发泡树脂、易加工聚氯乙烯树脂及氯乙烯 -丙烯酸酯 -苯乙烯接枝共聚物的新方法。分析了国外经济规模聚氯乙烯生产装置的经济效益 ,总结了国外聚氯乙烯加工应用技术的发展 ,并对发展我国聚氯乙烯工业提出了建议 相似文献
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介绍了1998~1999年世界主要国家和地区聚氯乙烯市场动态,分析了氯乙烯合成和聚合工艺技术的发展趋势,叙述了聚氯乙烯加工应用技术的发展,针对国内聚氯乙烯工业的具体情况,提出了发展我国聚氯乙烯工业的建议。 相似文献
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新型农用塑料棚膜的田间覆盖试验研究 总被引:4,自引:1,他引:3
介绍了从 1998年 2月至 1999年 12月在北京海淀区对韩国现代石化公司的PE和EVA棚膜与国产相应棚膜的覆盖对比试验。观测了棚膜的农艺性、透光性、保温性、流滴性、防雾性、耐候性以及棚膜的力学性能变化 ,并讨论了棚膜的配方与这些性能的关系。 相似文献
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耐候聚丙烯老化性能的研究 总被引:14,自引:1,他引:13
分别研究了弹性体、成核剂DICK、BaSO4、光稳定剂UV-531、UV-770有其复合体系对耐候聚丙烯老化性能的影响。结果发现,所研制的耐聚丙烯老化后的拉伸强度保持率、伸长率保持率、冲击强度保持率均优于耐候聚丙烯的理化指标。 相似文献
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In this article properties and possible applications of the polyamide from isophthalic acid and hexamethylenediamine are described. This product shows a high transparency, and its mechanical and electrical properties are practically independent of its moisture content. Other typical properties of polyamides such as mechanical strength, impact strength, chemical resistance and tracking resistance are retained. 相似文献
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以不同含量的二乙烯三胺(DETA)固化的环氧树脂为基体,制备了碳纤维增强树脂基复合材料。通过扫描电镜和红外光谱分析了T-300型碳纤维表面形貌和基团组成。通过拉伸实验、冲击实验对复合材料的力学性能进行了表征;通过紫外老化实验对复合材料的耐候性进行了表征;通过扫描电镜和热重分析对复合材料的断面形貌和耐热性进行了表征。结果表明:碳纤维增强树脂基复合材料具有良好的耐候性、力学性能、而且还具有质量轻、高比强度等一系列优异的性能。 相似文献
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In the present work, hyperbranched urethane alkyd high solid coatings were formulated by mixing hyperbranched alkyd and isocyanate trimer. Initially, a second generation hyperbranched polyol (HBP) was synthesized using dipentaerythritol (DPE) as a core material and 2,2-bis(methylol)propionic acid (BMPA) as a chain extender. This was reacted with varying concentrations of linseed oil fatty acid (LOFA) to make a series of hyperbranched alkyd (HBA) resins. Viscosity and volume solid of the HBA resins were measured. The resins were characterized by Fourier transform infrared (FTIR), and 13C Nuclear magnetic resonance (13C NMR) spectroscopic techniques. The hyperbranched alkyd resins containing varying amount unreacted hydroxyl groups were cured with hexamethylene diisocyanate (HDI) trimer (Desmodur N 3390) depending on their NCO: OH ratio to make hyperbranched urethane alkyd coatings. A series of such coatings were made by mixing HBA/isocyanate trimer (Desmodur N 3390) ratio with respect to the hydroxyl group present on the HBA. The performance of the coated specimens was evaluated by various techniques such as pull-off adhesion strength, tensile strength, abrasion resistance, scratch resistance, flexibility, and impact resistance tests. The weathering properties of the coated specimens were evaluated by UV-Weatherometer. Corrosion resistance of the coated specimens was evaluated by electrochemical impedance spectroscopy (EIS), salt spray, seawater immersion and humidity tests. It was observed that, there exists an optimum coating composition in terms of NCO: OH (HBA: Desmodur N 3390) ratio which showed excellent enhancement in terms of the mechanical, weathering and corrosion resistance properties than remaining coating compositions. 相似文献