Low-temperature-resistant and moisture-resistant graphene all-in-one coating and preparation process thereof

By combining functionalized rGO powder with superdispersants and cashew phenol amine curing agents, the problems of interface failure and graphene flocculation in heavy-duty anti-corrosion coatings under low temperature and high humidity environments were solved, achieving efficient self-removal of interface moisture and multi-level labyrinth shielding, thus improving construction efficiency and anti-corrosion performance.

CN122302687APending Publication Date: 2026-06-30浙江正恒纳米科技股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
浙江正恒纳米科技股份有限公司
Filing Date
2026-05-19
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing heavy-duty anti-corrosion coatings suffer from interface failure and flash corrosion when applied in low-temperature and high-humidity environments. Graphene is prone to flocculation, resulting in low application efficiency. Furthermore, the traditional three-coat system is cumbersome, increasing the application burden and cost.

Method used

By combining functionalized rGO powder with superdispersants, mixed solvents, and cashew phenol amine curing agents, and through static pre-wetting, staged resin coating, and high-flow-rate circulating sand milling processes, an interfacial moisture self-removal, π-π stacking space steric hindrance, and multi-level labyrinth shielding structure are formed, achieving efficient dispersion and anti-corrosion performance of the topcoat integrated coating.

Benefits of technology

In an environment with temperatures ranging from -5℃ to 5℃ and relative humidity >85%RH, the coating surface drying time is ≤12.5h, wet pull-out adhesion is ≥5.0MPa, and the unilateral erosion width in a 2000h neutral salt spray test is ≤1.2mm, reducing construction steps and lowering overall costs.

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Abstract

This invention relates to the field of anti-corrosion coating technology, and discloses a low-temperature and moisture-resistant graphene substrate-surface integrated coating and its preparation process. The coating consists of components A and B; component A contains 20-30 parts of mixed epoxy resin, 2-5 parts of reactive diluent, 0.5-2 parts of functionalized rGO powder, 0.2-0.6 parts of pyrene- or naphthalene-containing superdispersant, 5-12 parts of zinc phosphate, 8-15 parts of flake mica powder, and 3-8 parts of mixed solvent; component B is 40-55 parts of cashew phenolic amine curing agent; the grinding fineness of component A is 20-30 μm. The preparation process sequentially includes static pre-impregnation and aging, staged resin coating, high-flow-rate circulating sand milling, and application compounding. This invention utilizes a hydrophobic repulsion mechanism at the interface and a π-π non-covalent anchoring resistance mechanism to achieve single-coat thick coating application in environments of -5~5℃ and RH>85%, with a surface drying time of ≤12.5h, wet adhesion of ≥5.0MPa, and salt spray corrosion diffusion of ≤1.2mm after 2000h. It completely solves the problems of low-temperature flash corrosion, graphene flocculation, and multi-coat application, and is suitable for corrosion protection in marine engineering and polar facilities.
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