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《中国化工》2008,(8):64-64
聚氨酯-丙烯酸酯复合乳液虽然较单一乳液的性能有很大改善,但是其涂膜的硬度、耐水性、耐化学品性还难以满足高档水性木器涂料的要求。最近,湖南大学化学化工学院在聚氨酯-丙烯酸酯复合乳液中,以不同方式加入环氧树脂,分别制备了物理共混和化学共聚的聚氨酯-丙烯酸酯-环氧树脂复合乳液(PUEA),着重研究了环氧树脂加入方式、用量等对乳液及涂膜性能的影响。发现环氧树脂对于涂膜的硬度、耐水性、耐化学品性等有明显改进.研究还表明,环氧树脂的质量分数在3%~4%为宜。近年许多研究者利用PU乳液和PA乳液性能上具有的良好互补作用,共聚制备聚氨酯-丙烯酸酯(PUA)复合乳液;在先前的PUA复合乳液研究基础上,加入环氧树脂,合成环氧树脂改性的聚氨酯-丙烯酸酯(PUEA)复合乳液,可使其涂膜的吸水率显著降低,硬度与其他有关性能也有一定提高。 相似文献
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A stable epoxy-acrylate composite latex was successfully prepared through emulsion polymerization of modified epoxy acrylic (EPAC) oligomer with acrylate monomer. The EPAC oligomer was obtained using active acrylic acid (AA) to react with epoxy resin. And by regulating the reaction degree of the active hydrogen of AA and epoxide group, there is the acquisition of terminal double bond that gives EPAC reactivity, together with the partial retention of the epoxide group that enables self-crosslinking during film formation. The structural conformation of the oligomer was ascertained by Fourier transform infrared (FTIR) spectroscopy. The factors influencing the stability of the epoxy-acrylate composite latex were investigated. The epoxy-acrylate composite latex was the most stable when methyl acrylic acid was 1.5 wt% and modified EPAC oligomer was 15 wt% of the total monomer weight. The morphology and property of the composite latex films were characterized by scanning electron microscopy, transmission electron microscopy (TEM), and temperature-modulated differential scanning calorimetry (TOPEM-DSC). The results confirm that there is successful emulsion copolymerization between modified EPAC oligomer and acrylate monomer. TEM show that the particles of epoxy-acrylate composite have a core-shell structure, and there is no free epoxy resin. The FTIR and TOPEM-DSC results reveal that the copolymer emulsion possesses self-crosslinking ability. During film formation, self-crosslinking reaction occurs between epoxide groups with carboxyl groups, giving exothermal phenomena. The thermal stability as well as the corrosion resistance of the films was analyzed. The results show outstanding thermal stability as well as corrosion resistance attributable to the crosslinking reticulation structure. It is envisaged that the epoxy-acrylate composite latex has great potential in the development of high-performance aqueous coatings. 相似文献
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采用双酚A型环氧树脂与非离子表面活性剂反应,合成了反应型水性环氧乳化剂,将具有表面活性的分子链段引入到环氧树脂分子链中,用相反转技术制备水性环氧树脂乳液。为了改善乳液与固化剂的相容性,合成了聚醚型水性环氧树脂固化剂,用其制备的双组分水性环氧防腐涂料具有优异的机械性能、耐水性、耐盐水性及耐盐雾性。 相似文献
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苯丙水性涂料广泛应用于木器涂饰、地面涂料和内墙装饰等行业。但在防腐领域,由于成膜物质致密性差、易闪锈和易脱落的缺点,其应用受到很大限制。本文通过苯乙烯与丙烯酸丁酯进行反应,制得性能优良的苯丙复合乳液和苯丙水性防腐涂料。实验结果表明,当乳液固质量分数为40%、玻璃化转变温度(T_g) 0℃以上、环氧树脂质量分数6%和NaOH用量为0.28%时,苯丙水性防腐涂料的综合性能最佳。 相似文献
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以自制的环氧树脂乳状液为漆基、磷酸锌作为活性防锈颜料合成了水性环氧防腐涂料。研究了涂料中颜基比、固化剂与环氧树脂的当量比等对涂膜性能的影响。结果表明,颜基比小于1,固化剂CEN-537与环氧树脂E-44的当量比为1或稍大于1时,所得涂膜的各项性能指标可达到较好的平衡;涂料的防绣性能与以硅铬酸铅为防绣颜料的传统涂料相当。新研制的水性环氧防腐涂料性能达到了国外同类产品的水平。 相似文献
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环氧改性水性聚氨酯的合成工艺及性能研究 总被引:1,自引:0,他引:1
采用甲苯二异氰酸酯(TDI)、聚醚二元醇(GE-210)、1,4-丁二醇(BDO)、二羟甲基丙酸(DMPA)、环氧树脂(E-128)和丙烯酸羟丙酯(HPA)为主要原料,制备环氧改性水性聚氨酯乳液。研究预聚体中的—NCO和—OH物质的量之比(R)及小分子扩链剂、亲水扩链剂、环氧树脂的加入量,对粒径、黏度、贮存稳定性和涂膜耐水性的影响。实验结果表明:预聚体中R值为6~7;小分子扩链剂BDO用量为7%~8%;亲水扩链剂DMPA的用量为6%~7%;环氧树脂添加量为6%~7%时,乳液外观及稳定性最好,涂膜的耐水性能优异,可以作为一种性能优异的涂料用水性聚氨酯树脂。 相似文献
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选用环氧树脂E-51、邻苯二甲酸酐(PA)和聚乙二醇单甲醚(MPEG)为原料,合成了反应型非离子水性环氧树脂乳化剂,然后通过相反转法制备了水性环氧树脂乳液,研究了MPEG相对分子质量乳化剂用量对乳液稳定性和涂膜固化性能的影响。采用红外光谱(FT-IR)对乳化剂进行结构表征,通过透射电镜(TEM)观察了乳液中乳胶粒的形貌及其分布状态。结果表明:当MPEG相对分子质量为2 000,乳化剂用量为10%时,乳液稳定性良好,且制得的水性环氧树脂乳液的涂膜固化物具有优良的涂膜性能,铅笔硬度达2H,柔韧性为2 mm,耐冲击性达50 cm;耐水性优良。 相似文献