SUPER-WATER REPELLENT ORGANIC/INORGANIC COMPOSITE PARTICLES, AND PROCESS FOR PREPARING THEM

摘要

An ultra water repellent in/organic composite particles and preparation method thereof are provided to improve the chemical stability and thermal durability owing to its high water contact angle and low surface free energy, and to produce various particle sizes ranged from a nanometer to micrometer scale, while giving improved water repellency through a simple treatment process with a small amount of use, thereby having an application of a preventing finger print or reflection on a display screen, and of water proof/antifouling paint. The ultra water repellent in/organic composite particles comprise a polymer containing a perfluoroalkyl group which is fixed to the surface of inorganic particles by means of an azo type chlorosilane, so as to form an organic shell. The preparation method of the ultra water repellent in/organic composite particles comprises: immobilizing an azo type chlorosilane to the surface of inorganic particles through a chemical reaction between hydroxyl groups on the surface of the inorganic particles and an azo type chlorosilane initiator; carrying out grafting-from polymerization with monomers containing a perfluoroalkyl group so as to fix the compound having a perfluoroalkyl group onto the surface of the inorganic core and to form an organic shell.