Anticorrosive coating composition

Abstract

An anticorrosive coating composition comprising (A) an epoxy resin, (B) an amine-type curing agent, and (C) a hydroxyl-containing coumarone resin, characterized in that the coumarone resin (C) is contained in an amount of 1 to 500 parts by weight per 100 parts by weight of the epoxy resin (A). The coumarone resin (C) is preferably one which contains hydroxyl in an amount of 1 to 5% in one molecule and has a softening point of 200 DEG C or below. The coating composition can give coating films in which the plural resin components are homogeneously mixed and which are excellent in anticorrosion property, water resistance, and adhesion. Further, since the composition is free from tar unlike conventional anticorrosive coating compositions, it can give light-colored cured coating films free from bleed-out of any component and is clear of the problems of safety and hygiene in application.

Description

technical field [0001] The present invention relates to an anticorrosion coating composition. More specifically, the present invention relates to a coating that has excellent seawater resistance, can form gray and other bright-colored coating films, and can be used for surface coating of marine oil pipelines, etc., and is especially useful for coating the interior of ships such as ballast tanks. anti-corrosion coating composition. Background technique [0002] Conventionally, tar epoxy coatings with excellent corrosion resistance have been used to paint the interior of ships such as ballast tanks. Since this paint contains tar, there are safety and hygiene problems. Moreover, since its color is black similar to the color of the base material steel plate, it is difficult to visually distinguish the film thickness of the coating film. If you want to paint with a uniform film thickness If it is installed, its coating operation and inspection are quite difficult. In addition,...

AI Technical Summary

Problems solved by technology

Since this paint contains tar, there are safety and hygiene problems. Moreover, since its color is black similar to the color of the base material steel plate, it is difficult to visually distinguish the film thickness of the coating film. If you want to paint with a uniform film thickness installed, its coating operation and inspection are quite difficult

In addition, the coating film containing tar has problems in maintenance and management such as the presence or absence of corrosion of the steel plate by visual inspection, and the influence of heat during welding of the steel plate, which causes the coating film to burn and deteriorate over time.

And, the coating that contains tar also has tar component to move (ooze out) gradually in the topcoat layer that is coated on this tar-based coating film, influences the attractive in appearance of the ship or steel structure that is coated, to antifouling Problems with adverse effects on performance, weather resistance, etc.

[0003] Now there is an anti-corrosion coating composition, which uses epoxy resin, coumarone resin and hydroxyl-containing terpene phenolic resin in the main agent, and uses polyamine, polyamide, etc. in the curing agent. The component composed of cured epoxy resin and amine curing agent has insufficient compatibility with coumarone resin, so it is necessary to add terpene phenolic resin, and coumarone resin cannot be used alone. From this point of view, its utilization Restricted (Japanese Patent Laid-Open No. 2001-279167: Patent Document 1)

[0004] In addition, tar-free coating films that do not contain non-reactive coating film modifiers such as coumarone resins generally lack flexibility of the coating film, and may have coating film defects in extremely deformed parts

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