有机化蒙脱土和纳米粒子对水性聚氨酯的改性作用

针对纳米改性剂在水性聚氨酯改性方面的应用,介绍了水性聚氨酯纳米复合材料的制备方法,总结了近年来在水性聚氨酯纳米改性方面所取得的成就,重点讨论了有机化蒙脱土和纳米粒子SiO_2改性剂在提高水性聚氨酯的耐水性、热稳定性和力学性能方面的突出作用,并展望了今后水性聚氨酯纳米复合材料的发展方向。     

纳米二氧化硅改性水性聚氨酯的研究进展

综述了纳米SiO_2改性水性聚氨酯(WPU)的背景和改性原理。目前纳米SiO_2改性水性聚氨酯常用且较成熟的三种方法:溶胶-凝胶法、共混法以及原位接枝聚合法。对这三种改性水性聚氨酯的方法进行分类概括,阐述近年来在这三种方法中用纳米SiO_2改性水性聚氨酯的研究进展。     

水性聚氨酯的改性研究概况

详本文介绍了水性聚氨酯的性能特点,重点阐述了水性聚氨酯改性方法:丙烯酸改性、环氧树脂改性、有机硅改性、交联改性、纳米无机材料改性、植物油改性.并指出了水性聚氨酯改性技术进一步发展的方向.     

纳米材料在改性水性聚氨醋中的应用(I)

本文介绍了纳米材料改性水性聚氨酯的制备方法,综述了纳米二氧化硅、纳米二氧化钛、纳米蒙脱土和纳米聚多糖对水性聚氨酯改性的研究进展,并对该类涂料的发展趋势和应用前景进行了展望.     

纳米材料在改性水性聚氨酯中的应用（Ⅰ）

本文介绍了纳米材料改性水性聚氨酯的制备方法,综述了纳米二氧化硅、纳米二氧化钛、纳米蒙脱土和纳米聚多糖对水性聚氨酯改性的研究进展,并对该类涂料的发展趋势和应用前景进行了展望。     

水性聚氨酯改性研究

本文综述了为改善水性聚氨酯的性能,常用的改性方法,如丙烯酸改性、环氧树脂改性、有机硅改性、纳米改性、植物油改性等,及改性水性聚氨酯的应用。     

水性聚氨酯的研究进展

近几年来,水性聚氨酯的产品一直是国内比较热的聚氨酯产品研发领域。本文综述了水性聚氨酯改性的5种方法,其中包括:有机硅改性、环氧树脂改性、纳米改性、丙烯酸酯改性和交联改性。并且根据当前形势对水性聚氨酯材料的发展前景和应用领域进行了展望。     

水性聚氨酯改性研究

本文综述了为改善水性聚氨酯的性能,常用的改性方法,如丙烯酸改性、环氧树脂改性、有机硅改性、纳米改性、植物油改性等,及改性水性聚氨酯的应用。     

纳米蒙脱土有机改性及其在水性聚氨酯中的应用

介绍了纳米蒙脱土的结构、有机化改性剂的种类和有机改性纳米蒙脱土的制备方法;简述水性聚氨酯-蒙脱土纳米复合材料的制备,综述了有机化蒙脱土在改性水性聚氨酯中的应用,并对该类水性聚氨酯涂料的发展趋势和应用前景进行了展望。     

水性聚氨酯复合改性的研究进展

总结了近几年来国内外在利用有机树脂或有机化合物复合改性、有机硅复合改性、天然产物复合改性和纳米粒子复合改性等方法改性水性聚氨酯方面的研究进展,并展望了未来水性聚氨酯复合改性的发展方向。     

我国聚氨酯胶粘剂的发展现状及趋势

评述了我国聚氨酯胶粘剂的发展现状和趋势,对一些主要胶种如鞋用聚氨酯胶、通用型聚氨酯胶、复合膜用聚氨酯胶粘剂、单组份聚氨酯液体胶、无溶剂聚氨酯结构胶、水性聚氨酯胶粘剂、单组份湿固化聚氨酯密封胶、聚氨酯泡沫密封剂、反应型聚氨酯热熔胶等的发展状况、市场和趋势分别作了概述。     

聚氨酯填充型泡沫混凝土复合材料的性能研究

将不同掺量聚氨酯(PU)加入泡沫混凝土(FC),研究聚氨酯填充型泡沫混凝土(FC/PU)复合材料的性能。结果表明:随着PU掺量的增加,FC/PU复合材料的导热系数不断降低,阻燃性能变差。PU掺量为0~4%时,随着PU掺量的增加,FC/PU复合材料的浆体黏度逐渐降低,气孔特性变好,抗压强度不断增大。PU掺量超过4%时,FC/PU复合材料黏度开始增大,气孔特性变差,抗压强度逐渐降低。PU掺量为4%时,FC/PU复合材料的综合性能最优,与未掺入PU相比,黏度降低62.7%,气孔特性较好,抗压强度提高75.0%,导热系数降低18.7%,阻燃性能仍能达到A1级。     

Damping properties of interpenetrating polymer networks of polyurethane‐modified epoxy and polyurethanes

Interpenetrating polymer networks (IPNs) were prepared from polyurethane (PU)‐modified epoxy with different molecular weight of polyol and polyurethanes based on the mixture of polydiol and polytriol by a one‐shot method. Two types of PU‐modified epoxy: PU‐crosslinked epoxy and PU‐dangled epoxy were synthesized, and the effects of the different molecular weights of polyol in the PU‐modified epoxy/PU IPNs on the dynamic mechanical properties, morphology, and damping behavior were investigated. The results show that the damping ability is enhanced through the introduction of PU‐modified epoxy into the PU matrix to form the IPN structure. As the molecular weight of polyol in PU‐modified epoxy increases, the loss area (LA) of the two types of the IPNs increases. PU‐dangled epoxy/PU IPNs exhibit much higher damping property than that of the PU‐crosslinked epoxy/PU IPNs with 20 wt % of PU‐crosslinked epoxy. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 328–335, 1999     

用FTIR研究聚氨酯／不饱和聚酯IPN体系的反应动力学

利用傅里叶变换红外光谱研究聚氨酯不饱和聚酯互穿聚合物网络体系的反应动力学，求出了ＰＵ的反应速度常数ｋ。实验结果表明，ＰＵ在半－ＩＰＮ体系中的反应为二级反应，ＩＰＮ体系中ＰＵ组分与ＵＰ组分的反应相互影响：ＵＰ组分使ＰＵ组分的前期反应速度变慢，后期反应速度相对增加；ＰＵ组分使ＵＰ组分聚合的诱导期明显缩短。ＰＵ和ＵＰ的配比对反应转化率的影响是反应前期ＰＵ组分含量越高，ＰＵ组分反应转化率也越高；反应后期，     

软包装用聚氨酯胶黏剂发展近况

简要介绍了软包装及所用聚氨酯(PU)复膜胶的迅猛发展历程.分别介绍了溶剂PU胶黏剂、醇溶PU胶黏剂、无溶剂PU胶黏剂和水性PU(WPU)胶黏剂的发展概况及其优缺点.随着技术进步和环保意识的增强,PU复膜胶由溶剂型逐步向无溶剂、水性方向发展.还介绍了将丙烯酸酯基团引入WPU主链以降低成本、改进某种性能、引人双键等方面的研...     

环保型聚氨酯涂料的研究进展

综述了环保型聚氨酯固化剂品种、性能与应用,阐述了水性聚氨酯涂料分类、制备方法和改性研究以及聚氨酯粉末涂料和有机硅聚氨酯功能涂料的改性研究进展。讨论了聚氨酯固化剂中游离单体脱除的工艺和方法,建议采用聚合与高效分离技术相结合的方法降低聚氨酯固化剂中残留游离异氰酸酯单体含量。指出聚氨酯涂料的发展趋势为进一步完善高固体含量羟基树脂的制备技术,发展无异氰酸酯基的潮固化聚氨酯涂料,充分利用可再生的植物油制备无溶剂聚氨酯涂料。     

浅谈我国聚氨酯弹性体发展动态

介绍聚氨酯弹性体的特性。指出我国将成为全球聚氨酯(PU)弹性体的消费和产能大国,其中氨纶、热塑性聚氨酯(TPU)弹性体、PU鞋底、PU合成革是我国聚氨酯弹性体未来主导产品,纺织工业和轻工业是拉动我国今后PU弹性体快速发展的主要产业。     

Interpenetrating polymer networks of polyurethane and furfuryl alcohol,IIa. Processability and properties of pultruded fiber-reinforced composites

A feasibility study of pultrusion of fiber-reinforced polyurethane/furfuryl alcohol (PU/FA) interpenetrating polymer/network IPN composites has been made. From the viscosity study, it was found that the pot life of the PU/FA IPN prepolymers increased with PU content and showed high reactivity at elevated temperature. It was confirmed from the morphological study that the wetting of fibers by the PU/FA IPN resins was improved with PU content. The appearance of the tensile failure surfaces of the pultruded glass fiber-reinforced PU/FA IPN composites showed “hackle patterns” for PU contents below 15 phr. The mechanical property study shows that the tensile strength of pultruded PU/FA IPN composites is the highest when the PU content is 5 phr. However, the flexural strength, flexural modulus and HDT decreased with PU content. The mechanical properties of various fiber-reinforced (glass, carbon, and Kevlar 49 aramid fiber) pultruded PU/FA IPN composites increased with fiber volume content.     

Effect of using sepiolite silicate + fumed silica mixtures as fillers on the characteristics of solvent-based polyurethane adhesives

Abstract —Both fumed silica and sepiolite have been used as a filler of polyurethane (PU) adhesives. Although effective, the small particle size and the relative high cost of fumed silica are limitations in some applications. Sepiolite is cheaper than fumed silica, but its relatively large particle size facilitates its settling from the adhesive solutions. In this study, the usefulness of using sepiolite + fumed silica mixtures as a filler in solvent-based PU adhesives is demonstrated. The rheological and adhesion properties of the PU adhesive solutions and the rheological and mechanical properties of the PU films (without solvent) were studied. SEM micrographs of PU films showed the morphology and compatibility of the fillers with the PU matrix. The use of sepiolite + fumed silica mixtures inhibited the settlement of the filler from the PU adhesive solutions, increased both the storage and the loss moduli, and improved the rheological and mechanical properties of the PU. On the other hand, the green (immediate) T-peel strengths of roughened styrene-butadiene rubber/PU adhesive joints and plasticized PVC/PU adhesive joints were greatly improved in filled PU adhesives. The effects produced by using fumed silica alone or sepiolite + fumed silica mixtures were very similar, although in general, somewhat more marked in fumed silica-filled PU.     

PU/有机蒙脱土纳米复合材料的制备和性能研究

采用原位插层聚合法制备PU/有机蒙脱土(OMMT)纳米复合材料。通过X射线衍射和透射电镜分析发现,当OMMT质量分数为0 01和0 03时,OMMT完全剥离并较均匀地分散于PU基体中;当OMMT质量分数为0 05时,OMMT在PU基体中发生部分剥离。热重分析表明,加入OMMT可提高复合材料的耐热性。动态力学分析表明,OMMT对PU模量的影响不大。PU/OMMT复合材料的硬度、弹性模量、拉伸强度和拉断伸长率均比纯PU有所提高。