共查询到20条相似文献,搜索用时 78 毫秒
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介绍了我国聚氨酯硬质泡沫塑料用发泡剂的发展现状,主要包括烷烃类发泡剂、水发泡剂和氢氟烷烃类发泡剂,分析了我国发泡剂发展过程中面临的主要挑战。 相似文献
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从静态和动态对发泡剂的性能随温度变化规律进行了实验研究。结果表明:不同发泡剂类型发泡剂性能随温度变化规律不尽相同;高温对发泡剂性能影响大,当温度大于100℃要考虑降解对发泡剂的影响,蒸汽泡沫调驱所用发泡剂应选择耐高温的发泡剂。 相似文献
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塑料用化学发泡剂 总被引:3,自引:1,他引:2
蔡宏国 《现代塑料加工应用》2001,13(4):45-48
介绍了发泡剂的发展、分类以及国内外产品概况,重点从化学发泡剂、吸热性泡剂、复合型发泡剂、发泡剂母料等方面概述了发泡剂的进展。 相似文献
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主要介绍了泡沫混凝土发泡剂的研究应用现状,着重对表面活性剂类发泡剂和蛋白质类发泡剂的研究进展进行了总结。并对发泡剂的发展趋势进行了展望。 相似文献
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海绵橡胶有机发泡剂研究进展 总被引:1,自引:0,他引:1
概述了海绵橡胶用有机发泡剂的分类和基本特性,介绍了有机发泡剂热分解性能的研究状况,有机发泡剂与硫化体系的相互作用,以及有机发泡剂的研究进展。 相似文献
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发泡剂的类型及加工特性 总被引:6,自引:0,他引:6
马承银 《现代塑料加工应用》1996,8(3):37-42
介绍了聚合物发泡剂的类型、分解特性、发泡助剂对发泡剂分解温度的影响以及复合发泡剂与发泡剂母料配制的原理。 相似文献
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采用动力学和热力学相结合的方法,用自行设计的发泡剂发气量测量装置研究了重金属盐、金属氧化物、有机酸及其盐等对发泡剂AC热分解特性的影响;用DSC差示扫描量热仪测定了各体系的动态分解温度和热效应。结果表明,三盐基硫酸铅、二盐基亚磷酸铅、硬脂酸铅和柠檬酸对发泡剂AC都有较强的活化作用,属于加速型发泡助剂;氧化锌是发泡剂AC较理想的活化引发剂,当其用量为01份时,活化作用较好;而硬脂酸、硬脂酸钡和柠檬酸钠的活化作用较小,属于延缓型发泡助剂 相似文献
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The effective diffusion coefficients of novel, environmentally friendly, hydrofluorocarbon (HFC) blowing agents for polyurethane foam production were measured. The method was based on gas chromatography and infrared spectroscopy measurements. The accuracy and reliability of the procedure developed were confirmed by comparisons of experimental and the predicted thermal aging curves. The slope of the aging curves (i.e., the change in thermal conductivity with time) depended only on the effective diffusion coefficients. The effective diffusion coefficients of the new HFC blowing agents were close to those of conventional hydrochlorofluorocarbon (HCFC) blowing agents, and the aging behavior of foams produced from HFC or HCFC blowing agents were similar. Polym. Eng. Sci. 44:2229–2239, 2004. © 2004 Society of Plastics Engineers. 相似文献
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Physical blowing agents such as n‐pentane and methyl formate and, for comparison, chemical blowing agents such as water were used to prepare structural polyurethane rigid foams of different densities by reaction injection molding. Experimental runs were carried out with formulations based on oligomeric isocyanate and a mixture of polyether polyols. The constitutive equations for the vaporization rate of the two blowing agents and the polymerization kinetics data are reported. Experimental results were compared with the prediction of a simplified theoretical model, and they showed a satisfactory agreement in terms of temperatures and density profile. All the specimens were characterized by physical‐mechanical properties such as hardness, impact strength, flexural strength and elastic modulus and the results were reported in function of the densities. The best mechanical performance were obtained with the physical blowing agents, due to a better density distribution profile and a thicker skin layer. 相似文献
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对太阳能热水器聚氨酯保温材料所用发泡剂的替代方向作了详细介绍,并对各类发泡剂的性能及其在太阳能热水器发泡体系中的应用进行了对比分析. 相似文献
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偏氯乙烯/丙烯腈共聚树脂浸渍发泡剂的研究 总被引:1,自引:0,他引:1
采用浸渍法在偏氯乙烯/丙烯腈共聚树脂中引入发泡剂,研究了树脂组成和性能、浸渍温度和时间等因素对浸渍量和浸渍速率的影响。 相似文献
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低密度聚苯乙烯仿木线材挤出发泡研究 总被引:2,自引:0,他引:2
李志杰;李晓强;张际亮 《中国塑料》2011,25(6):82-86
结合聚苯乙烯(PS)化学自由挤出发泡工艺,探讨了合成级新料与再生原料树脂的特性对发泡效果和发泡制品冲击性能的影响;比较了放热型改性AC发泡剂、吸热型改性NaHCO3放热吸热复合发泡剂对再生料PS发泡制品的密度、泡孔结构、气孔均匀度的影响;探究了不同发泡剂对发泡制品芯层泡孔结构的影响。结果表明,发泡剂含量为1 %时,采用AC发泡剂和复合发泡剂的发泡制品的密度分别为0.47 g/cm3和0.39 g/cm3。 相似文献
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挤出微发泡R—PVC发泡剂和泡孔调节剂的优选 总被引:2,自引:0,他引:2
采用自行设计安装的放气量测量装置和差示扫描量热仪对发泡剂AC.Exocerol232和CCF进行分解动力学和热力学性能测试,研究了泡孔调节剂K-400,ZB-530对R-PVC基本配方体系塑化性能的影响,利用Brabender挤出机对微发泡R-PVC挤出专用料的配方进行了优选。 相似文献