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纳米SiO2对水性外墙涂料耐沾污性能影响研究 总被引:8,自引:0,他引:8
采用水溶性有机硅改性剂和无皂乳液聚合法研究了纳米 Si O2 的表面改性 ,改性后纳米 Si O2 的团聚体尺寸约80 nm。改性后的纳米 Si O2 对聚丙烯酸酯水性外墙涂料涂膜的表面硬度和耐沾污性能有较大提高。此外 ,探讨了纳米Si O2 质量分数以及环境温度对耐沾污性能的影响。 相似文献
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Magnetic polyethyleneimine chelating resin(PEI2) was prepared. Its average diameter was 0. 44mm and it contained magneticparticles over 11% of the microcapsules after it had been treated with 8%hot HCl. The results showed that tbe reaction media had significant effecton Physical forms,magnetic particles content and stability in acid of themicrocapsules.PEI2 bad very high adsorption capacity to Au~(3+),Pb~(2+) andHg~(2+),and little one towards Mg~(2+),Pb~(2+) and Cu~(2+).It was discoveredthat PEI2 could reduce Au~(3+) into elemental gold. 相似文献
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Three chelating resins were prepared by re-acting poly (β-chloroethyl glycidyl ether) with benzidine, o-tolidine and o-dianisidine respectively, and their structureswere confirmed by IR spectra and elementary analyses. Theadsorption properties of the resins for Au (Ⅲ), Pd (Ⅱ). Pt(Ⅳ),Hg(Ⅱ) .Cu(Ⅱ),Pb(Ⅱ) and Zn(Ⅱ) were also investi-gated. The results show that the resin incorporating o-diani-sidine exhibits high affinity for Au (Ⅲ) within a broad rangeof hydrochloric acid .and selectively sorbs Au (Ⅲ) in the coexistance of Cu(Ⅱ), Zn(Ⅱ) and Mg (Ⅱ). Desorption of Au(Ⅲ),Pd (Ⅱ) and Pt (Ⅳ) sorbed proceeded quantitatively us-ing 0. 1 mol/l hydrochloric acid containing 2%-10% thioureaas desorbents. 相似文献
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有机硅-丙烯酸甲酯的乳液聚合研究 总被引:2,自引:0,他引:2
用丙烯酰端基的环氧乙烷-环氧丙烷共聚物作为共聚单体及反应性乳化剂,研究了甲基丙烯酰丙基硅氧烷和丙烯酸甲酯的乳液共聚合。探讨了反应性乳化剂用量与单体转化率、反应时间和乳胶粒径的关系,研制了有机硅单体质量分数为40%的稳定乳液。此外,用1H-NMR研究了滴加乳化单体液滴和一次加料两种方法下,共聚物组成与单体转化率的关系。结果表明,加料方式对共聚物组成有较大影响,水溶性大的单体优先聚合。 相似文献