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采用原位乳液聚合法,以硅烷偶联剂表面修饰的纳米TiO2与苯乙烯(St)、丙烯酸酯、有机氟单体(DFMA)为原料,合成了具有核壳结构的有机-无机杂化纳米TiO2/含氟苯丙复合乳液。探讨了乳化剂、DFMA和TiO2用量对复合乳液性能的影响,并通过粒径分析、接触角、傅里叶红外光谱(FT-IR)、热重(TG)、差示扫描量热仪(DSC)及透射电子显微镜(TEM)等方法对复合乳液和乳胶膜的结构及性能进行了表征。结果表明,由于纳米TiO2与DFMA的协同作用,涂膜的疏水性和耐热性能得到了较大提高,纳米TiO2/含氟苯丙复合粒子的平均粒径为100nm左右,当DFMA和TiO2用量分别为14%和2%(质量百分数)时,涂膜-空气界面对去离子水的接触角达112.3°,乳胶膜的表面能低至15.21mN/m。
In-situ emulsion polymerization was used to synthesize organic-inorganic hybrid nano-particles with core-shell structure by using nano-TiO2 and styrene (St), acrylate and organofluorine monomer (DFMA) TiO2 / fluorine-containing styrene-acrylic composite emulsion. The effects of emulsifier, DFMA and TiO2 dosage on the properties of the composite emulsion were investigated. The effects of emulsifier, DFMA and TiO2 on the properties of the composite emulsion were investigated. ) And transmission electron microscopy (TEM) were used to characterize the structure and properties of the composite emulsions and latex films. The results show that due to the synergetic effect of nano-TiO2 and DFMA, the hydrophobic and heat-resistant properties of the coating have been greatly improved. The average particle size of nano-TiO2 / fluorine-containing styrene-acrylic composite particles is about 100nm. Is 14% and 2% (mass percentage), the contact angle of the coating-air interface to deionized water is 112.3 °, and the surface energy of the latex film is as low as 15.21 mN / m.