纳米TiO_2改性丙烯酸乳液制备防滑膜的研究

Study on nano-powder TiO_2 modified polyacrylic emulsion to produce anti-skid film

水性丙烯酸乳液因其环保性而越来越多地被应用到涂布中,但若用于塑料薄膜涂布,则须先对丙烯酸乳液进行改性,以增加其耐水性和防滑性。采用硅烷偶联剂KH-570改变纳米TiO_2的表面性能,制备了KH-570/纳米TiO_2;再将其用于改性丙烯酸酯乳液以提高摩擦系数;将改性后的丙烯酸乳液涂覆在PE膜上,制备了防滑膜。结果表明:硅烷偶联剂的质量分数为20%时,KH-570/纳米TiO_2的表面性能最佳,亲油性和分散性明显改善;KH-570/纳米TiO_2与丙烯酸酯乳液的相容性较好,当纳米TiO_2在丙烯酸酯乳液中的添加量(w)为0.1%时,乳液的稳定性和耐水性最佳。对涂覆涂料前后的PE膜进行了附着力、静态接触角、静摩擦系数和剥离力测试,结果表明:改性纳米TiO_2质量分数为0.1%时的乳液,固化后涂层的静摩擦系数最高,粘连程度最低。

Water based polyacrylic emulsion grows a lot in coating as it is more friendly material to environment.But it must be modified on the polyacrylic emulsion to improve its water resistance and anti-skid properties.The surface of nano-TiO2 particle is modified with silane coupling agent KH-570,and KH-570/nano-TiO2 is prepared and added into polyacrylic emulsion to increase friction coefficient.The modified polyacrylic emulsion is coated on PE film and anti-skid film is prepared.The results show that the best surface properties and compatibility of nano-TiO2 is obtained by 20%mass fraction of silane coupling agent in it,and the lipophilicity and dispersibility is obviously improved.There is better compatibility between KH-570/nano-TiO2 and polyacrylic emulsion,and the emulsion displays the best stability and waterproof when the mass fraction of nano-TiO2 is 0.1%.The tests of adhesive force,static contact angle,coefficient of static friction and release force are carried out for PE film which is uncoated and coated with modified polyacrylic emulsion,and the results show that the coefficient of static friction and degree of adhesion of the coated PE film is greatly improved when there is 0.1%modified nano-TiO2 in the polyacrylic emulsion.