FILMS OR STRUCTURAL EXTERIOR MATERIALS USING COATING COMPOSITION HAVING SELF-CLEANING PROPERTY AND PREPARATION METHOD THEREOF

摘要

Disclosed is a coating composition comprising: (a) hydroxy group-containing inorganic particles having an average particle diameter of between 5 and 30 nm; (b) hydroxy group- containing inorganic particles having an average particle diameter of between 0.2 and 5 D; (c) an organosilane compound represented by the formula of R n Si(OR') 4-n (wherein R is a C1-C8 aminoalkyl group, glycidoxyalkyl group or isocyanatoalkyl group; R'is a C1-C6 lower alkyl group; and n is an integer of between 0 and 3); and (d) a solvent. A method for preparing the above coating composition, a substrate such as film or structural exterior material, having excellent self-cleaning property and staining resistance by using the above coating composition and methods for producing the same are also disclosed. The coating composition using hydroxy group-containing inorganic particles can improve the initial hydrophilicity of conventional coating agents. Additionally, the coating composition can form a hydrophilic coating layer having a contact angle with water of 30°or less by using two kinds of inorganic particles having a different particles diameter. Particularly, the coating composition uses an organic solvent having erosive property to a substrate to be coated and a low boiling point, and thus can be applied to a conventional production line for structural exterior materials without adding a separate coating line. Therefore, the coating composition can provide structural materials having hydrophilicity, excellent self-cleaning property and long service life, when coated on substrates such as vinyl sidings.