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高黏度苯丙乳液的制备 总被引:2,自引:0,他引:2
为了制备高性能的苯丙乳液,研究了乳化剂、助剂DZ-1及丙烯酸对苯丙乳液黏度及触变指数等性能的影响。研究结果表明:乳化剂用量低反应生成的凝聚物较多,用量大乳液的气泡较多。乳液的黏度和触变指数随DZ—1用置增大而大幅度提高。乳液黏度随丙烯酸用量的增加而提高,但用量超过3%后,耐水性能变差。乳化剂用量为1.0%,DZ-1用量为4.5%,酸用量为3.0%时合成的苯丙乳液黏度和触变指数较高。用该苯丙乳液配制的涂料黏度高、触变性好,耐擦洗及耐水性好,综合性能优良。 相似文献
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初步研究固体石蜡及固体石蜡丙烯酸改性乳液的相行为,讨论固体石蜡乳液及改性乳液的温度对折射率的影响、乳化剂用量对乳液粘度的影响、温度对乳液粘度的影响及乳化时间对乳液粘度的影响。结果表明,两种乳液的折射率随温度变化不大,粘度随着乳化剂用量的增大而增大,且随着乳化时间的增加而逐渐增大。 相似文献
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阴离子型聚氨酯乳液性能研究 总被引:6,自引:1,他引:5
本文用二羟甲基丙酸合成了阴离子型聚氨酯乳液。讨论了亲水单体的用量、不同中和剂、不同NCO/OH比例对乳液的粒径及粘度的影响,还讨论了不同扩链剂及其用量对乳液性能及粘结性能的影响。 相似文献
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有机硅改性丙烯酸酯微乳液的合成与表征 总被引:2,自引:1,他引:1
采用种子乳液聚合法,以有机硅微乳液为种子乳液,在其表面进行壳聚合,合成了核壳型有机硅改性丙烯酸酯微乳液。研究了交联单体以及有机硅种子乳液用量对硅丙微乳液性能的影响,并通过红外、核磁共振及差热分析等表征了共聚物的结构。结果表明:当引发剂用量为乳液总质量的0.4%、双丙酮丙烯酰胺为交联单体且用量为乳液总质量的3%、有机硅种子乳液用量为25%时,硅丙微乳液的单体转化率达95.53%,凝胶率小,乳胶粒粒径81.2 nm;与纯丙乳液相比,成膜性更好,玻璃化转变温度低3.7℃。 相似文献
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通过DSC、TG、溶胀性测定等分析方法,对环氧树脂/聚(丙烯酸丁酯一苯乙烯一甲基丙烯酸甲酯)[EP/P(BA-St-MMA)]半胶乳型互穿聚合物网络(semi-LIPN)中环氧树脂对体系的玻璃化转变、热稳定性、溶胀性、成膜性及乳胶膜的吸水性进行了考察。结果表明,在EP与丙烯酸酯总量一定的情况下,增大EP用量,实际上提高了丙烯酸酯聚合物的交联密度,从而使丙烯酸酯聚合物的玻璃化转变温度提高,而该semi-LIPN弹性体的溶胀性则略有降低;在热稳定性实验中,虽然EP的分解温度一致,但交联聚丙烯酸酯的分解温度提高;实验范围内,EP对乳液的成膜性影响不大,但可显著降低乳胶膜的吸水性,并提高乳液对基质的粘附力。 相似文献
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甲基丙烯酸接枝环氧树脂的制备与性能测试 总被引:1,自引:0,他引:1
通过丙烯酸类单体与环氧树脂接枝共聚反应,在环氧树脂中引入强亲水性基团-COOH,制备水性环氧乳液。探索了不同单体用量和加水温度对所得水性乳液的pH值、黏度、粒径、水分散性和储存稳定性的影响;考察了涂膜固化条件对涂膜的附着力、耐冲击性、耐水性的影响。试验结果表明,随着甲基丙烯酸用量增加,所制备的水性环氧乳液水分散稳定性增强,pH值降低,粒径变小;随着加水温度的增加,储存稳定性变差;固化剂含量占环氧树脂含量的15%和固化温度为120℃时,涂膜的外观、附着力、耐冲击性、耐水性等综合性能最好。 相似文献
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Hongsheng Wang Fangfang Yang Aiping Zhu Ting Lu Fantao Kong Lijun Ji 《Polymer Bulletin》2014,71(6):1523-1537
The styrene acrylic/epoxy (SA/EP) complex latex with high content of epoxy resin was successfully prepared through emulsion polymerization initiated by both water-soluble and oil-soluble initiators. The resulting complex latex demonstrated regular spherical morphology with a diameter ranging 150–300 nm and with a narrow size distribution. The compatibility between epoxy and styrene acrylic improved due to the styrene acrylic grafting epoxy formation during grafting copolymerization. The factors influencing the structure and storage time of the complex latex were investigated and the corresponding mechanism was revealed. The SA/EP complex latex can form crosslinking structure with epoxy curing agent at room temperature. The crosslinked complex latex film shows good mechanical properties and excellent chemical resistance. These SA/EP complex latexes show great potential in developing high-performance aqueous paints and adhesive. 相似文献
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A waterborne epoxy‐acrylate composite latex was synthesized. The effects of the concentration of the initiator, surfactant, and epoxy resin on the particle size, molecular weight, and grafting ratios of the composite latex were investigated. The increase of the concentration of the initiator and epoxy resin led to the decrease of the weight‐average molecular weight. The graft ratios increased with an increase in the initiator level and a decrease in the epoxy resin concentration whereas the variation of the concentration of the surfactant did not have much influence on the graft ratios. The increase in the initiator level caused the aggrandizement of the particle size, and the increase of the concentration of the surfactant and epoxy resin caused a decrease in the latex particle size. Fourier transform IR spectroscopy with attenuated total reflectance indicated that the epoxy resin molecules were enriched in the mold‐facing surface in the film from the composite latex. The differential scanning calorimetry analysis, dynamic mechanical analysis, and Instron test showed that the polymer films cast by the composite latex had lower tensile strength and glass transition than those by the blend latex. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 1736–1743, 2002 相似文献
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S. P. Vernekar M. B. Sabne S. D. Patil A. S. Patil S. B. Idage C. V. Avadhani S. Sivaram 《应用聚合物科学杂志》1992,44(12):2107-2114
Effect of latex concentration on the extent of epoxidation and physical properties of epoxidized natural rubber (ENR) was evaluated as a function of latex concentration in the range of 20–60% by weight. The epoxidation rate increased with increasing latex concentration. Physical properties and sequence distribution of an epoxy group of ENR with 30 mol % epoxy content was invariant with the latex concentration employed for epoxidation. 相似文献