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采用带有羧基活性官能团的丙烯酸酯类聚合物乳液对纳米SiO2进行表面修饰。并用透射电镜、红外、热失重、接触角、粒径分析对处理效果进行了表征。结果表明:所制备的含羧基基团的共聚物乳胶粒子在机械搅拌作用下,与粒径为15~20nm左右的无机SiO2纳米粒子的作用过程中,实现了对SiO2表面修饰和分散的效果。当复合温度(65℃)高于改性用聚合物的Tg(45℃)时,柔软的聚合物乳胶粒子变形、黏附在SiO2纳米粒子周围,并通过羧基的化学吸附作用最终实现对SiO2粒子的包覆;当复合温度(25℃)低于改性用聚合物的Tg(45℃)时,乳胶粒子仍保持其基本形状,SiO2粒子黏附在乳胶粒子周围。
Surface modification of nano-SiO2 was carried out by using acrylic polymer emulsion with carboxyl-reactive functional groups. The treatment effect was characterized by transmission electron microscopy, infrared, thermogravimetry, contact angle and particle size analysis. The results show that the prepared carboxyl group-containing copolymer latex particles have the effect of surface modification and dispersion of SiO2 particles under the action of mechanical stirring and the interaction with the inorganic SiO2 nanoparticles with the particle size of about 15-20 nm. When the compounding temperature (65 ℃) is higher than the Tg (45 ℃) of the polymer for modification, the soft polymer latex particles deform and adhere around the SiO 2 nanoparticles, and finally the chemical adsorption on the SiO 2 particles When the compounding temperature (25 ℃) is lower than the Tg (45 ℃) of the modified polymer, the latex particles retain their basic shape and the SiO2 particles adhere to the latex particles.