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IPDI聚酯型水性聚氨酯的合成研究 总被引:9,自引:0,他引:9
以聚酯二元醇OxyesterT1136、异氟尔酮二异氰酸酯 (IPDI)、二羟甲基丙酸 (DMPA)为原料 ,采用内乳化法合成了阴离子型水性聚氨酯皮革涂饰。研究了影响乳液及成膜物性能的各种因素。结果表明 ,此种聚酯型水性聚氨酯有优异的机械性能和耐黄变、耐有机溶剂和水 相似文献
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以丙烯酸乳液、硅溶胶为基本原料,通过添加偶联剂、闪蚀抑制剂等制备出有机/无机复合涂料,结合复合基料的微观结构,探讨了丙烯酸/硅溶胶的复合比对复合涂料的耐温性、耐有机溶剂性、耐盐水性等性能的影响。结果表明:复合涂膜的耐盐水、耐有机试剂、耐热性能均比纯丙烯酸涂膜大幅度提高;丙烯酸/硅溶胶复合基料固化膜随着其中硅溶胶含量的增加,硅溶胶成分有在涂膜表面富集的倾向,[第一段] 相似文献
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《合成材料老化与应用》2018,(6)
苯丙体系乳液和树脂作为水性涂料的成膜物质,具有优异的耐候性、低成本等诸多优点。本文考察了两种苯丙乳液与改性树脂配比对水性金属漆光泽度、水滴角、硬度、附着力、耐中性盐雾等性能的影响。结果表明:苯丙乳液RY-1与改性树脂复配后,涂层的耐中性盐雾腐蚀性提高21. 3%,而光泽度、硬度、附着力等其它性能均受到抑制;乳液RY-2与改性树脂的复配比为1∶3时,水性金属漆的综合性能最佳。 相似文献
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Nanocomposite particles consisting of silica (inorganic core) and polyacrylate (organic shell) were prepared in a form of emulsion by a new and simple method—the emulsion polymerization of acrylic monomers in the presence of silica sol. The key technique of the present emulsion polymerization, which made the formation of the nanocomposites successful, is the usage of nonionic surfactant above its cloud point. The morphology of the composite was investigated by DLS, AFM, and TEM, which clearly showed formation of the core‐shell‐type particles. A transparent film was prepared by casting the emulsion, which showed high resistibility against organic solvents. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 659–669, 2006 相似文献
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氟代聚丙烯酸酯改性聚氨酯复合乳液的制备及其疏水性 总被引:2,自引:0,他引:2
为了提高聚氨酯-丙烯酸酯复合乳液的耐水性和耐溶剂性,将聚氨酯溶液作为反应介质,以丙烯酸十二氟庚酯(FA)和丙烯酸羟丙酯为单体,偶氮二异丁腈为引发剂,在溶液中进行聚丙烯酸酯自由基聚合,然后用N-甲基二乙醇胺进行亲水基扩链,通过溶液聚合相转化法制得新型阳离子氟代聚丙烯酸酯改性聚氨酯复合乳液。通过红外光谱、透射电镜、光电子能谱仪和接触角测定仪分别对复合乳液的结构、乳胶粒形态、膜表面的化学元素组成及疏水性进行了研究。结果表明,含氟链段成功接入了大分子链中,乳液形成稳定的核-壳结构,在膜材料表面形成了主要由含氟丙烯酸酯链段组成的界面,FA的引入可使复合乳液胶膜与水的接触角(PUA膜与水的接触角)由65°提高至98°。 相似文献
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通过对一系列溶剂、乳化剂、助剂的筛选,配制了一种环境友好型农药制剂——5%高效氯氰菊酯水乳剂,确定了其最佳配方和制备方法,并对水乳剂的质量指标和性能进行了测试.结果表明:最佳配方下制备的产品质量稳定,各项指标均符合水乳剂的要求. 相似文献
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Effect of solvent type on preparation of ethyl cellulose microparticles by solvent evaporation method with double emulsion system using focused beam reflectance measurement
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The purpose of this study was to investigate the effect of solvent type on the solidification rate of ethyl cellulose (EC) microparticles and particle size/distribution of emulsion droplets/hardened microparticles during the solvent evaporation process using focused beam reflectance measurement (FBRM). EC microparticles were prepared with a water‐in‐oil‐in‐water solvent evaporation method using various solvents, including dichloromethane, dichloromethane–methanol (1:1), ethyl acetate and chloroform. The particle size/distribution of the emulsion droplets/hardened microparticles was monitored using FBRM. The morphology of EC microparticles was characterized using scanning electron microscopy (SEM). The transformation of the emulsion droplets into solid microparticles for all solvents occurred within the first 10–90 min. The square weighted mean chord length of EC microparticles prepared using chloroform was smallest, but the chord count was not the highest. The chord length distribution (CLD) measured by FBRM showed that a larger mean particle size gave longer CLD and a lower peak of particle number. SEM data revealed that the morphology of microparticles was influenced by the type of solvent. FBRM can be employed for online monitoring of the shift in the microparticle CLD and detect transformation of emulsion droplets into solid microparticles during the solvent evaporation process. The microparticle CLD and transformation process were strongly influenced by solvent type. © 2017 Society of Chemical Industry 相似文献
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Supercritical carbon dioxide is an environmentally benign solvent but its low polarity limits electrochemical reactions in it. We now report the electrochemical polymerization of pyrrole in a supercritical carbon dioxide-in-water (C/W) emulsion in the presence of a surfactant. Black polypyrrole films were formed on Pt electrodes, whose conductivity was comparable with non-oriented polypyrrole prepared in conventional solvents. The structure of the polypyrrole films was confirmed by IR and Raman spectroscopic measurements. p-Toluenesulfonic acid was a suitable supporting electrolyte among the electrolytes examined for the electrochemical polymerization in the C/W emulsion. A typical nodular morphology was observed on the basis of the SEM and AFM measurements. Confocal scanning microscope revealed the formation of a fine uneven texture on the film prepared in the C/W emulsion. 相似文献