Intumescent fire-retardant and anti-corrosive coating modified by polyaniline-silicon carbide and preparation method thereof

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 parts of waterborne epoxy resin emulsion, 0.5-10 parts of polyaniline-silicon carbide composite material, 35-50 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;
• 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;
• wherein the polyaniline-silicon carbide composite material is prepared 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;
• wherein the protonic acid aqueous solution is selected from the group consisting of sulfuric acid, hydrochloric acid and phosphoric acid, with a concentration of 0.1-0.3 Molar (M);
• wherein the fire-retardant filler comprises an acid source filler, a carbon source filler and a gas source filler;
• and
• wherein the acid source filler comprises at least one selected from the group consisting of ammonia 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.