Abstract: Material balance is maintained in a recycling system for aqueous paint by controlling a liquid amount within the recycling system while spray-coating an article. A recycling method includes: coating an article with aqueous paint in a water-curtain-type coating booth; collecting an over-spray paint, that does not adhere to the article, by virtue of a water curtain; sending a collected solution of paint and water to a condensation bath through a booth circulation water bath; separating this solution by an ultra-filtration apparatus into condensed paint and filtrate, with the condensed paint being transferred to a paint tank; and removing condensed paint from the paint tank, if necessary for adjustment of aqueous paint, followed by coating this aqueous paint onto an article, wherein a total amount of liquid present within the recycling system is controlled to be constant during spray-coating of an article.

Abstract: The present invention is to provide a recycle system of aqueous paint, wherein material balance is kept by controlling liquid amount within the recycle system when spray-coating.

Abstract: The present invention provides a recyclable cold curing aqueous coating composition, comprising (a) an oxidative-polymerizable, modified epoxy resin with an acid value of 25 to 60, comprising 20 to 70 percents by weight of an epoxy resin based on the total weight of said modified epoxy resin, of which a particle size is not more than 200 nm in an aqueous medium, (b) an anticorrosive pigment and/or an ampholytic metal oxide and (c) a drier. The recyclable cold curing aqueous coating composition of the present invention can provide a coating film having improved water resistance and corrosion resistance, and repeatedly reuse by recycling and readjusting. The present invention also provides a method for recycling the cold curing aqueous coating composition.

Abstract: The present invention provide a recyclable cold curing aqueous coating composition comprising an acrylic group-modified epoxidized ester resin with acid vale of 25 to 60, which is formed from an epoxy resin (a), a fatty acid (b) and an ethylenically unsaturated monomer (c) in a component (a)/component (b)/component (c) weigh % ratio of 20 to 70/20 to 50/3 to 50, the sum of (a), (b) and (c) being 100 weight %, and a method for reusing it. For the method of the present invention, the coating composition has improved recycling properties by optimizing the properties such as acid value of the resin, the pH of a collecting solution for use to collect the coating composition and a content of a hydrophilic solvent in the collecting solution.