Water-based formaldehyde-free painting pigment and preparation method thereof

By introducing zwitterionic/hydrophobic copolymer-grafted mesoporous silica nanoparticles and latent crosslinking agents into water-based paints, an organic-inorganic composite structure is constructed, solving the safety and performance issues of water-based paints and achieving high strength, flexibility, water resistance, and color uniformity, making it an environmentally friendly paint suitable for children.

CN121471744APending Publication Date: 2026-02-06SHANDONG MIYA STATIONERY CO LTD
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Patent Information

Application Number
CN202512000777.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-29
Publication Date
2026-02-06

AI Technical Summary

Technical Problem

Existing water-based paints rely on formaldehyde crosslinking agents, leading to harmful substance residues and health risks. The coating's water resistance, scrub resistance, and color vibrancy are difficult to optimize in a coordinated manner, resulting in insufficient interface stability and affecting service life and safety.

Method used

Mesoporous silica nanoparticles brush-grafted with zwitterionic/hydrophobic copolymers, combined with latent crosslinking agents and multi-stage addition of nanoparticles, are used to construct an organic-inorganic synergistically enhanced composite structure, avoiding formaldehyde crosslinking and achieving stepwise crosslinking and spatial gradient distribution.

Benefits of technology

It improves the adhesion, stain resistance, water resistance and color uniformity of the coating, enhances the flexibility and durability of the coating, meets strict environmental standards, and is suitable for use by children.

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Abstract

The invention relates to the technical field of pigments, in particular to a water-based formaldehyde-free painting pigment and a preparation method thereof. The method is realized by the following steps: firstly, grafting an initiator on the surface of amino mesoporous silica, and then grafting a zwitter-ion / hydrophobic copolymer brush on the surface of the amino mesoporous silica through purple light initiated polymerization; then preparing an acrylate pre-emulsion containing the functional nanoparticles, and carrying out semi-continuous emulsion polymerization to obtain a self-crosslinking emulsion; then introducing adipic dihydrazide as a latent cross-linking agent; and finally, adding functional nano-particles in multiple stages, mixing the functional nano-particles with pigments, auxiliaries and the like, and sanding and blending to obtain a final product. Formaldehyde is completely abandoned, a unique organic-inorganic composite structure and a latent cross-linking technology are utilized, the water resistance, scrubbing resistance, adhesive force and color stability of the pigment are synergistically improved, and meanwhile, the pigment has good environment-friendly safety and easy-to-clean performance and is particularly suitable for the fields of children painting and the like.
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