Water-based coating composition

The water-based coating composition for ceramic building materials, featuring an acrylic resin dispersion, silane coupling agent, and inorganic impregnation material, addresses the challenge of balancing strength and water-blocking properties, resulting in enhanced adhesion and resistance in processing sections.

JP7649066B1Active Publication Date: 2025-03-19日本ペイントインダストリアルコーティングス株式会社
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Patent Information

Application Number
JP2023207598
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2023-12-08
Publication Date
2025-03-19
Estimated Expiration
2043-12-08

AI Technical Summary

Technical Problem

Existing water-based coating compositions for ceramic building materials struggle to achieve a coating film that balances strength and water-blocking properties, particularly in the processing sections where cutting and shaping occur, leading to issues with adhesion, freeze-thaw resistance, and blocking resistance.

Method used

A water-based coating composition comprising a coating film forming resin (A) with an acrylic resin water dispersion, a silane coupling agent (B), and an inorganic impregnation material (C), specifically including colloidal silica or metal silicate, which penetrates and fixes into the substrate, enhancing strength and water resistance.

Benefits of technology

The coating film achieves excellent adhesion, water-blocking properties, freeze-thaw resistance, and blocking resistance, even in the processing sections of ceramic building materials, ensuring improved durability and performance.

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Abstract

The present disclosure has an object to provide an aqueous coating composition capable of realizing a coating film that satisfies both the strength and water blocking properties (water resistance), and preferably an object to provide an aqueous coating composition capable of realizing a coating film that has good adhesion, water blocking properties, freeze-thaw resistance, and blocking resistance, even in processed parts of ceramic building materials. The aqueous coating composition disclosed herein comprises a film-forming resin (A), a silane coupling agent (B), and an inorganic impregnating material (C), The coating film-forming resin (A) contains an acrylic resin water dispersion (A1), the content of units derived from styrene in the acrylic resin in the acrylic resin water dispersion (A1) is 5% by mass or more; The acrylic resin in the acrylic resin water dispersion (A1) has an acid value of 10 mgKOH / g or more on a solid content basis, The inorganic impregnating material (C) contains one or more selected from colloidal silica (C1) and metal silicates (C2).
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