Preparation method of self-repairing waterborne polyurethane leather coating material containing polyurethane colloid capsule

By preparing SiO2 nanoparticles-stable polyurethane colloid capsules, the problems of microcapsules compatibility and agglomeration in traditional self-healing water-based polyurethane leather coatings are solved, and the self-healing and mechanical properties are improved, which is suitable for the self-healing and wear resistance of leather coatings.

CN120272091APending Publication Date: 2025-07-08SICHUAN UNIV
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Patent Information

Application Number
CN202510491211.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-18
Publication Date
2025-07-08

AI Technical Summary

Technical Problem

Among the existing self-healing water-based polyurethane leather coating materials, traditional microcapsule healing agents have poor compatibility with the matrix, resulting in poor self-healing and mechanical properties, and are prone to agglomeration in aqueous systems.

Method used

The Pickering emulsion method was used to prepare the O/W emulsion with stable SiO2 nanoparticles as the colloid capsule template. The polyurethane colloid capsule was formed through sol-gel reaction. The healing agent in the colloid capsule was polyurethane, which had good chemical compatibility with the aqueous polyurethane matrix, and was dispersed stably, forming a spherical colloid capsule and dispersing uniformly in the aqueous coating.

Benefits of technology

It improves self-repair performance and mechanical properties, avoids weakening of performance, enhances the flexibility and wear resistance of the coating, realizes on-demand repair, and is suitable for industrial fields such as leather.

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Abstract

The invention provides a preparation method of a self-repairing waterborne polyurethane leather coating material containing a polyurethane colloid capsule, which comprises the following steps: firstly, preparing an O / W type Pickering emulsion by taking modified SiO2 nanoparticles as a stabilizer and a polyurethane solution as an oil phase; the preparation method comprises the following steps: firstly, taking the polyurethane colloid capsule as a template, forming the colloid capsule capable of being dispersed in a water system through a sol-gel reaction, and finally, uniformly dispersing the colloid capsule into a waterborne polyurethane leather finishing emulsion to prepare the waterborne polyurethane leather self-repairing coating material containing the polyurethane colloid capsule. According to the invention, the polyurethane healing agent is used as a core material, and the modified SiO2 nanoparticles are used as a shell wall, so that the prepared spherical colloid capsule is high in encapsulation efficiency and strong in stability. According to the preparation method provided by the invention, the problems of poor self-repairing performance and mechanical property caused by low compatibility of a healing agent and a polyurethane matrix for leather finishing and easy agglomeration of a traditional microcapsule in a waterborne polyurethane emulsion in a traditional external aid type self-repairing polyurethane coating are solved; and the wear resistance of the leather polyurethane coating is remarkably improved by introducing SiO2.
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