# US 2025/0145839 A1 · Intumescent fire-retardant and anti-corrosive coating modified by polyaniline-silicon carbide and preparation method thereof

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- Number: US 2025/0145839 A1
- Document ID: US20250145839A1
- Status: Published application
- Kind: A1
- Application number: 18/751,369
- Filed: 2024-06-24
- Published: 2025-05-08
- Earliest claimed: 2023-11-08
- Assignees: China Academy of Machinery Wuhan Research Institute of Materials Protection Co. Ltd.
- Applicants: China Academy of Machinery Wuhan Research Institute of Materials Protection Co. Ltd.
- Inventors: Dan Jia; Yijie Jin; Haitao Duan; Shengpeng Zhan; Tian Yang; Ao Chen; Hualong Yu; Lixin Ma; Xiaoshuang Luo
- Web page: https://patentgrep.com/patent/US20250145839A1

## CPC

- C09D 5/185: {Intumescent paints}
- C08L 63/00: Compositions of epoxy resins; Compositions of derivatives of epoxy resins
- C09D 5/022: {Emulsions, e.g. oil in water}
- C09D 5/027: {Dispersing agents (anti-settling agents C09D7/45)}
- C09D 5/028: {Pigments; Filters}
- C09D 5/086: {Organic or non-macromolecular compounds}
- C09D 5/18: Fireproof paints {including high temperature resistant paints}
- C09D 7/45: Anti-settling agents
- C09D 7/48: Stabilisers against degradation by oxygen, light or heat
- C09D 7/61: inorganic
- C09D 7/63: organic
- C09D 7/65: macromolecular (C09D7/41-C09D7/48 take precedence)
- C09D 163/00: Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

An intumescent fire-retardant and anti-corrosive coating modified by polyaniline-silicon carbide and a preparation method thereof are provided, the coating includes a compound A and a compound B. The compound A includes a waterborne epoxy resin emulsion, polyaniline-silicon carbide composite material, fire-retardant filler, titanium dioxide, aluminum hydroxide, talc powder, a wetting dispersant, a defoaming agent, a flow agent and water, the compound B includes an epoxy hardener. The polyaniline-silicon carbide composite material is prepared from silicon carbide, phenylamine, protonic acid and an oxidizing agent through an ice bath. The polyaniline-silicon carbide composite material can enhance dispersion in the emulsion through the organic-inorganic composite, and silicon carbide has high thermal stability and good density, while polyaniline serves as a material with unique fire-retardant properties. The synergy between the two effectively enhances the fire resistance and anti-corrosion performance of the coating, strengthens the strength of the intumescent layer, and solves existing problems.

## Claims

### Claim 1

An intumescent fire-retardant and anti-corrosive coating modified by polyaniline-silicon carbide, made from the following components in parts by weight:
a compound A, comprising: 20-50 part of waterborne epoxy resin emulsion, 0.5-10 parts of polyaniline-silicon carbide composite material, 30-50 parts of fire-retardant filler, 1-5 parts of titanium dioxide, 1-5 parts of aluminum hydroxide, 1-5 parts of talc powder, 0.5-3 parts of wetting dispersant, 0.5-3 parts of defoaming agent, 0-3 parts of flow agent, 1-10 parts of film-forming additive and 0-10 parts of water; and
a compound B, comprising 5-15 parts of epoxy hardener;
wherein the parts by weight of the flow agent and the water are greater than 0.

### Claim 2 (depends on 1)

The intumescent fire-retardant and anti-corrosive coating modified by the polyaniline-silicon carbide as claimed in claim 1, wherein the waterborne epoxy resin emulsion comprises at least one selected from the group consisting of bisphenol A waterborne epoxy resin emulsion, bisphenol F waterborne epoxy resin emulsion, and acrylic-modified waterborne epoxy emulsion.

### Claim 3 (depends on 1)

The intumescent fire-retardant and anti-corrosive coating modified by the polyaniline-silicon carbide as claimed in claim 1, wherein the polyaniline-silicon carbide composite material is prepared from silicon carbide, phenylamine, protonic acid and an oxidizing agent as follows:
preparing a protonic acid aqueous solution using the protonic acid, putting the protonic acid aqueous solution in an ice-water mixture for ice bath, putting the silicon carbide and the phenylamine into the protonic acid aqueous solution to stir, thereby obtaining a reaction solution; and
preparing an oxidizing agent aqueous solution using the oxidizing agent, adding the oxidizing agent aqueous solution into the reaction solution to stir and react for 1-2 hours (h), thereby obtaining a suspension; centrifuging and filtering the suspension to obtain a precipitate, washing the precipitate with deionized water, thereby obtaining the polyaniline-silicon carbide composite material.

### Claim 4 (depends on 1)

The intumescent fire-retardant and anti-corrosive coating modified by the polyaniline-silicon carbide as claimed in claim 1, wherein the fire-retardant filler comprises an acid source filler, a carbon source filler and a gas source filler;
wherein the acid source filler comprises at least one selected from the group consisting of ammonia polyphosphate, ammonium polyphosphate, and ammonium phosphate; the carbon source filler comprises at least one selected from the group consisting of pentaerythritol and dipentaerythritol; and the gas source filler comprises at least one selected from the group consisting of melamine and dicyandiamide.

### Claim 5 (depends on 1)

The intumescent fire-retardant and anti-corrosive coating modified by the polyaniline-silicon carbide as claimed in claim 1, wherein the flow agent is a polyether-modified silicone flow agent.

### Claim 6 (depends on 1)

The intumescent fire-retardant and anti-corrosive coating modified by the polyaniline-silicon carbide as claimed in claim 1, wherein the defoaming agent is emulsified polysiloxane.

### Claim 7 (depends on 1)

The intumescent fire-retardant and anti-corrosive coating modified by the polyaniline-silicon carbide as claimed in claim 1, wherein the wetting dispersant is a nonionic surfactant.

### Claim 8 (depends on 1)

The intumescent fire-retardant and anti-corrosive coating modified by the polyaniline-silicon carbide as claimed in claim 1, wherein the epoxy hardener is an amine hardener.

### Claim 9 (depends on 1)

The intumescent fire-retardant and anti-corrosive coating modified by the polyaniline-silicon carbide as claimed in claim 1, wherein the film-forming additive comprises at least one selected from the group consisting of 1-Methoxy-2-propanol, 2-methyl-2,4-pentanediol, and 2-ethoxyethanol.

### Claim 10

A preparation method of an intumescent fire-retardant and anti-corrosive coating modified by polyaniline-silicon carbide, comprising:
mixing 20-50 parts by weight of waterborne epoxy resin emulsion, 0.5-10 parts by weight of polyaniline-silicon carbide composite material, 30-50 parts by weight of fire-retardant filler, 1-5 parts by weight of titanium dioxide, 1-5 parts by weight of aluminum hydroxide, 1-5 parts by weight of talc powder, 0.5-3 parts by weight of wetting dispersant, 0.5-3 parts by weight in a half of defoaming agent, 0-3 parts by weight of flow agent, 1-10 parts by weight in a half of film-forming additive and 0-10 parts by weight of water to obtain a mixed solution, stirring the mixed solution at a speed of 2000-3000 revolutions per minute (r/min) and dispersing for 15-30 minutes (min) to obtain a reacted solution;
supplementing the film-forming agent and the defoaming agent once each into the reacted solution to stir at a speed of 1000-1500 r/min for 8-14 min, thereby obtaining a compound A;
mixing an amine hardener to obtain a compound B; and
mixing the compound A and the compound B to obtain the intumescent fire-retardant coating modified by the polyaniline-silicon carbide.