溶剂浸渍树脂的萃取分离性能研究

介绍了溶剂浸渍树脂的制备及性能,阐述了溶剂浸渍树脂在产物提纯和废水处理等分离过程中的应用,并对使用溶剂浸渍树脂处理含酚废水进行了初步研究.     

汽车滤纸浸渍树脂研究进展

综述了3类汽车滤纸浸渍树脂:醇溶性、水溶性和复合型树脂的现状及发展趋势,着重介绍了水溶性浸渍树脂(聚醋酸乙烯乳液、聚苯乙烯丙烯酸乳液和聚丙烯酸酯乳液)的改性研究进展,并对汽车滤纸浸渍树脂的性能指标和检测、表征方法作了归纳。     

炭素专利

<正>公开号:CN102951927A公开日:2013-03-06申请人:青岛鸿源换热器有限公司发明人:殷志军发明名称:利用超声波原理浸渍石墨电极的方法本发明涉及一种石墨电极的浸渍方法。利用超声波原理浸渍石墨电极的方法,包括如下步骤:(1)将加工好的石墨电极清洗,烘干后放入浸渍容器内;(2)对浸渍容器抽真空,并保持;(3)浸渍容器内注入树脂,树脂液面高于石墨电极;(4)保持恒温,开动压缩机和超声波装置,并保持;(5)取出树脂,得到浸渍后的石墨电极。经浸渍后的人造石墨电极,各种树脂(包括酚醛树脂、呋喃树脂、乙烯基酯树脂、聚四氟乙烯及其他混合树脂等)分布均匀、表面附着力强、浸渍深度增加、浸渍件增     

热固性树脂的高压浸渍试验

为提高滑板的抗折强度，选择了显气孔率和气孔孔径与滑板比较相似的碳材料作为试验材料，将其浸渍在4种热固性树脂中，调查了浸渍效果。4种热固性树脂中的两种为甲阶类酚醛树脂，另外两种为呋喃系变性树脂。从其浸渍试验结果可知，酚醛树脂有助于降低气孔率，呋喃系变性树脂有助于提高强度。从浸渍处理后提高滑板特性的效果来看，树脂的不挥发份多的更有效。采用浸渍效果好的酚醛树脂B，以98MPa浸渍滑板，浸渍时的加压保持时间为30min，浸渍率便可达到饱和，抗折强度比目前采用的焦油沥青浸渍的强度高。     

树脂液相浸渍法制备3D针刺碳/碳预制体影响因素研究

本文以3D针刺碳毡为增强体,热塑性酚醛树脂为先驱体,采用真空压力浸渍法多次浸渍一次碳化和一次浸渍一次碳化两种工艺制备碳/碳多孔预制体,以用于制备碳/碳化硅复合材料,研究真空度、增强体尺寸、浸渍液浓度、浸渍温度及压力等因素对浸渍效果的影响。结合试样碳化前后SEM显微结构变化,探讨了树脂液相浸渍机理。实验结果表明,树脂液相浸渍用真空度以稍高于浸渍液在浸渍温度下的饱和蒸气压为宜。树脂溶液浓度、浸渍温度和压力分别为80%、40~50℃和0.6MPa时浸渍效果最好。增强体尺寸越大,浸渍效果越差。     

砂轮网片生产与存在问题诌议

前言玻璃纤维增强树脂砂轮网片是以玻璃纤维网格布为基材,经浸渍树脂、烘干、切裁后,用于高速切割树脂砂轮(PB)和高速磨削树脂砂轮(JB)的增强,以提高砂轮的回转速度和抗冲击强度.在玻璃纤维网布的规格确定之后,浸渍树脂的性能及浸渍工艺对网片起主要的作用.以前国内通用的浸渍树脂是热固性酚醛,基本适用于砂轮手工生产冷压成型的工艺,但存在着包装后网片之间相互粘联,存放期短,以及制成砂轮抗冲     

Cyanex272浸渍树脂支持体的选择及性能表征

以非极性HPD100,HPD300,中极性HPD400,HPD450和极性HPD500,HPD800三类大孔吸附树脂为Cyanex272浸渍树脂支持体进行研究和比较.结果表明,大孔树脂对Cyanex272的浸渍率与树脂的比表面积和平均孔径有关.HPD800大孔吸附树脂是Cyanex272浸渍树脂分离重稀土良好的支持体,对萃取剂的浸渍率为40.22%,吸附重稀土的量为9.94 mg/g,经过9次循环后的损失率为1.88%,且在水及盐酸溶液中稳定性良好.     

溶剂浸渍树脂提取硼酸的探索实验

结合溶剂萃取法和离子交换法的优点,制备了溶剂浸渍树脂,用于从卤水中提取硼酸的研究.采用异辛醇为萃取剂,大孔吸附树脂AB-8,D4020和S-8为负载萃取剂的树脂载体,制备了3种溶剂浸渍树脂,并分别用于从盐湖卤水中提取硼酸的实验,得到了比较满意的结果.证明了使用溶剂浸渍树脂从盐湖卤水中提取硼酸的可行性.     

不透性石墨的浸渍

用作石墨材料补隙增强的有机合成树脂,普遍采用的有酚醛、环氧和糠酮树脂三种。三种树脂各有其优缺点:酚醛系热固性树脂,浸渍工艺简单,能耐酸性腐蚀,但它对提高制品的机械强度和降低气孔率不够理想;环氧树脂具有很高的粘合力,能大幅度降低石墨孔隙,抗碱性较强,然而工艺不易掌握;糠酮树脂对酸碱具有双重适应性,浸渍工艺也较简便,它浸渍的制品物理性能略次于环氧。鉴于酚醛树脂浸渍效果不佳,似有淘汰的趋势,为此本文着重介绍糠酮和环氧两种树脂浸渍石墨的有关工艺和性能。     

液相浸渍法制备C／C复合材料

介绍了液相浸渍炭纤维坯体的两种方法，探讨了沥青浸渍和树脂浸渍的浸渍过程和增密效果，比较了两种浸渍方法的相似之处和不同之处。     

泡沫塑料发泡剂的研究进展

介绍了泡沫塑料常用的发泡剂,比较了各种发泡剂,如AC发泡剂及多种物理发泡剂的优缺点,并提出水发泡是今后发泡剂的发展方向。     

发泡剂的类型及加工特性

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。     

吹塑工艺对改性共聚尼龙/高密度聚乙烯中空吹塑瓶阻隔性能的影响

将由乙烯-丙烯酸酯-马来酸酐共聚物(CP)与共聚尼龙(PA-54)在双螺杆挤出机中反应共混制得的改性共聚尼龙(MCOPA)与高密度聚乙烯(HDPE)通过层状共混工艺制备高阻隔性中空吹塑瓶。研究表明,吹塑工艺对阻隔瓶的阻隔性能具有很大的影响。     

发泡剂AC的热分解活化机理及影响因素*

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０１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     

New experimental method for determination of effective diffusion coefficient of blowing agents in polyurethane foams

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.     

发泡剂对丙烯酸酯橡胶发泡材料性能的影响

采用模压法制备丙烯酸酯橡胶(ACM)发泡材料,研究了发泡剂品种和用量对其性能的影响。结果表明:以发泡剂4,4'-氧代双苯磺酰肼(OBSH)或偶氮二甲酰胺(AC)制备ACM发泡材料时,最佳用量分别为ACM用量的6%和7%;以复合发泡剂AC/OBSH、AC/碳酸氢钠、OBSH/碳酸氢钠分别制备ACM发泡材料时,最佳使用量分别为ACM用量的7%、7%、6%;当三组复合发泡剂使用量相同时,复合发泡剂AC/OBSH制备的ACM发泡材料发泡倍率最大,微孔孔径较一致,分散均匀。     

Chemical and physical blowing agents in structural polyurethane foams: Simulation and characterization

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.     

浅谈冰箱用聚氨酯发泡剂的替代技术

从保护环境的角度出发,介绍了目前冰箱用聚氨酯发泡剂HCFC-141b和环戊烷的两种主要替代技术,叙述了两种替代技术在替代过程中需要考虑的几个主要因素,并对使用该替代技术发泡的泡沫物性做了一些比较。简单叙述了替代发泡剂的最新进展。     

Expandable styrene/methyl methacrylate copolymer: Synthesis and determination of VOCs by combined thermogravimetry/differential thermal analysis‐gas chromatography/mass spectrometry

Parts cast of metals using expandable polystyrene foams may have an unacceptable amount of surface defects, such as lustrous carbon. The use of foams made of styrenic/acrylic copolymers can improve the quality of foam molds and metal parts made using such molds. Lost foam copolymer was synthesized by suspension copolymerization of styrene and methyl methacrylate. The polymerization was carried out in the presence of blowing agents. The decomposition products of lost foam beads were studied by a method composed of the thermogravimetry/differential thermal analysis (TG/DTA) and gas chromatography/mass spectrometry (GC/MS). With these systems, the TG/DTA data can be combined with a GC separation and MS identification methods. This combined method improves the analysis of the decomposition products of lost foam beads and enables the precise identification of the amount and the nature of volatile organic compounds (VOCs) trapped during suspension polymerization. The results obtained from the combined method were verified for the nature and amount of VOCs with the results of time‐conversion studies for copolymerization of monomers in the presence of different concentrations of blowing agent. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

挤出微发泡R—PVC发泡剂和泡孔调节剂的优选

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。