Environment-friendly chromium-free polyester primer for pre-coated color steel sheet, preparation method and application thereof

By using a specially formulated environmentally friendly chromium-free polyester primer, the problem of insufficient anti-corrosion performance of chromium-free primers on the cut edges of substrates is solved, achieving excellent comprehensive performance and durability, and suitable for coating pre-coated color steel plates.

CN122168135APending Publication Date: 2026-06-09NIPPON PAINT IND COATINGS SHANGHAI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NIPPON PAINT IND COATINGS SHANGHAI
Filing Date
2024-12-06
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing chromium-free primer coatings lag behind chromium-based primer coatings in terms of resistance to corrosion at substrate edges, which limits the application and service life of chromium-free primer coatings.

Method used

An environmentally friendly, chromium-free polyester primer with a specific formulation contains polyester resin, amino resin, titanium dioxide, anti-corrosion pigments, nitrogen-containing heterocyclic compounds, and solvents. It is prepared through a stirring, grinding, and dilution process to form a composite coating with excellent performance.

Benefits of technology

It improves the edge corrosion resistance of the coating material used with the chromium-free primer, while maintaining excellent appearance, solvent resistance, water resistance, acid and alkali resistance, and mechanical properties, thus extending the durability of the coating.

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Abstract

This invention discloses an environmentally friendly chromium-free polyester primer for pre-coated color steel sheets, its preparation method, and its application. By weight percentage, the raw materials forming the primer include: 40-80% polyester resin, 0-25% amino resin, 1-15% titanium dioxide, 5-20% anti-corrosion pigment, 0.1-5% nitrogen-containing heterocyclic compound, and 5-30% solvent and additives. This method effectively solves the performance problem of environmentally friendly chromium-free primers used with pre-coated color steel sheets, particularly the issue that the edge corrosion resistance of the substrate is significantly worse than that of chromium-based primers.
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