基于CaCO3/SiO2复合粒子的超疏水表面制备

通过表面化学修饰,制备了超疏水CaCO3/SiO2复合粒子,并用接触角测量仪检测疏水性能,当CaCO3与纳米SiO2质量比小于10：1时,可以制得超疏水复合粒子.基于表面修饰的CaCO3/SiO2复合粒子,对亲水涂料进行改性,当CaCO3与纳米SiO2质量比小于6：1时,可以制得超疏水涂层,且涂层疏水性随复合粒子加入量的增加而增大.同时,采用扫描电镜、红外光谱和热重分析等对复合粒子进行结构表征,探讨了基于CaCO3/SiO2复合粒子制备超疏水表面的机理.

Preparation of super water-repellent surfaces on the basis of CaCO3/nano-SiO2 composite particles

Super water-repellent composite particles were prepared with surface-modified composite particles of CaCO3/SiO2.The wettability of the composite particles was checked by contact angle measurements.It was indicated that super water-repellent composite particles could be obtained when the mass ratio of CaCO3 to SiO2 was less than ten.On the basis of the surface-modified composite particles of CaCO3/SiO2,a super water-repellent coating was obtained when the mass ratio of CaCO3 to SiO2 was less than six.The contact angle on the coating became larger with increasing the content of composite particles.The formation mechanism of super water-repellent surfaces from surface-modified composite particles of CaCO3/SiO2 was discussed by scanning electron microscopy,infrared spectrometry and thermogravimetry.