Composite material carrying zinc oxide fine particles adhered thereto and method for preparing same

A method for preparing a zinc oxide fine particle-adhered composite material which shows antibacterial, deodorizing, UV absorbing, photocatalytic, stain-proofing and purifying activities, which consists essentially of a substrate selected from the group consisting of fibers, fibrous substrates, paper products, molded articles of synthetic resins, films and ceramics and zinc oxide fine particles adhered thereto, in which the zinc oxide fine particles having an average particle size of not more than 0.5 .mu.m are firmly adhered to the surface without using any binder and the zinc oxide fine particles are substantially exposed on the surface of the substrate, wherein the method comprises the step of contacting an aqueous suspension of zinc oxide fine particles with the substrate to thus deposit the zinc oxide fine particles on the surface of the substrate.

A method for preparing a zinc oxide fine particle-adhered composite material which shows antibacterial, deodorizing, UV absorbing, photocatalytic, stain-proofing and purifying activities, which consists essentially of a substrate selected from the group consisting of fibers, fibrous substrates, paper products, molded articles of synthetic resins, films and ceramics and zinc oxide fine particles adhered thereto, in which the zinc oxide fine particles having an average particle size of not more than 0.1 .mu.m are firmly adhered to the surface without using any binder and the zinc oxide fine particles are substantially exposed on the surface, wherein the method comprises the step of contacting the substrate carrying a zinc ion-containing acidic solution attached thereto with an aqueous alkaline solution to thus cause a reaction therebetween under alkaline conditions.

A method for preparing a zinc oxide fine particle-adhered composite material which shows antibacterial, deodorizing, UV absorbing, photocatalytic, stain-proofing and purifying activities, which consists essentially of a substrate selected from the group consisting of fibers, fibrous substrates, paper products, molded articles of synthetic resins, films and ceramics and zinc oxide fine particles adhered thereto, in which the zinc oxide fine particles having an average particle size of not more than 0.1 .mu.m are firmly adhered to the surface without using any binder and the zinc oxide fine particles are substantially exposed on the surface, wherein the method comprises the steps of contacting the substrate carrying a zinc ion-containing acidic solution attached thereto with an aqueous alkaline solution to thus cause a reaction therebetween under alkaline conditions and, immediately thereafter, ripening in a solution which hardly solubilizes zinc oxide for a time of not less than 5 minutes.