Amphoteric polyaniline coated silicon dioxide suspension and preparation method and application thereof

By modifying the sol-gel method and emulsion polymerization method, and combining the reaction of epoxy groups with amino groups and the competitive polymerization reaction of aniline, long-chain silane and fumaric acid, the prepared amphoteric polyaniline-coated silica suspension achieved good dispersibility and anti-corrosion performance in water-based coatings. This solved the problem of poor dispersibility and hydrophobicity of polyaniline powder in water-based coatings, and improved the anti-corrosion effect of the coatings.

CN121825282APending Publication Date: 2026-04-10SHAANXI YUNENG FINE CHEM MATERIALS CO LTD +1
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Patent Information

Application Number
CN202511943517.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-22
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

Existing polyaniline powders have poor dispersibility in water-based coatings, making it difficult to maintain hydrophobicity and anti-corrosion properties after drying. Furthermore, existing methods cannot effectively combine hydrophobicity, flexibility, and water dispersibility.

Method used

By modifying the sol-gel method, introducing emulsifiers and organic liquids, and using emulsion polymerization, the ring-opening reaction of epoxy groups and amino groups in the oil phase is adopted to increase the bonding strength between polyaniline and the core. An interpenetrating network shell layer is constructed on the surface of the nano-silica carrier through competitive polymerization of aniline, long-chain silane and fumaric acid, making it hydrophilic in the suspension state and superhydrophobic and corrosion resistant after drying.

Benefits of technology

The prepared amphoteric polyaniline-coated silica suspension exhibits good dispersibility and anti-corrosion properties in water-based coatings. It is hydrophilic in the suspension state and superhydrophobic after drying, forming a hydrophobic anti-corrosion passivation film, which improves the thixotropic and anti-corrosion properties of water-based coatings.

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Abstract

The invention belongs to the technical field of water-based coatings, and relates to an amphoteric polyaniline coated silicon dioxide suspension and a preparation method and application thereof.Hydrophobic nano silicon dioxide sol is prepared in the presence of an emulsifier and organic liquid through an improved sol-gel method and an emulsion polymerization technology; carrying out surface grafting by utilizing a silane coupling agent containing an epoxy group to obtain an epoxy functionalized silicon dioxide suspension; then under an acidic low-temperature condition, taking the suspension as a core, enabling aniline, fumaric acid and long-chain hydrophobic silane to be subjected to reactivity reaction under the action of an oxidizing agent, and firmly grafting polyaniline to the surface of silicon dioxide through ring-opening reaction of an epoxy group and an amino group to form an interpenetrating network shell layer with hydrophobic long-chain alkyl and hydrophilic carboxyl. The obtained filler is not additionally added with a surfactant, has good dispersity and hydrophilicity in a water suspension state, and shows super-hydrophobicity and excellent corrosion resistance after being dried into powder, and the filler suspension can be directly added into an anionic water-based coating, so that the physical shielding and electrochemical protection capabilities of the coating are remarkably improved.
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