Slow-release rust-inhibiting microcapsule applied to reinforced concrete and preparation method of slow-release rust-inhibiting microcapsule

Through the synergy between the three-layer capsule wall design and the capsule core material, the sustained-release rust-resistance microcapsules solve the problem of steel bar corrosion, improve the anti-chlorine ion erosion performance and structural durability of concrete, and extend the service life.

CN120393876APending Publication Date: 2025-08-01JIANGXI UNIV OF TECH
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Patent Information

Application Number
CN202510613408.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-13
Publication Date
2025-08-01

AI Technical Summary

Technical Problem

In the prior art, the problem of steel bar corrosion is difficult to effectively solve, especially in humid and high salt environments, which leads to reduced durability and safety risks of concrete structures. The repair effect of existing microcapsules is limited by the difficulty of contacting the curing agent.

Method used

The three-layer intelligent response capsule wall design is adopted, including a sustained-release rust-resistance microcapsule with pH trigger inner layer, dynamic self-restoration middle layer and hydrophobic protective outer layer. The capsule core contains composite rust-resistance microspheres and nanohydrotalcite. The combination of modified tung oil and cage polysilsesquioxane can improve the anti-chlorine ion erosion performance of concrete.

Benefits of technology

The rust inhibitor release and long-term stability are achieved, which significantly improves crack repair efficiency, enhances the durability and mechanical properties of concrete, extends service life, and reduces wear.

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Abstract

The invention provides a slow-release corrosion-resistant microcapsule applied to reinforced concrete, the slow-release corrosion-resistant microcapsule comprises a capsule core and a capsule wall, and the capsule core comprises a composite corrosion inhibitor, self-repairing microspheres, nano hydrotalcite and an anti-freezing agent; the capsule wall comprises a three-layer structure including an inner layer film, a middle layer film and an outer layer film. The mass ratio of the capsule core to the capsule wall is 1: (0.3-0.5); and the thickness of the capsule wall is 10-17 microns. A pH triggering inner layer, a dynamic self-repairing middle layer and a hydrophobic protection outer layer are designed through three layers of intelligent response capsule walls, and on-demand release and long-term stability of a corrosion inhibitor are achieved; the crack repairing efficiency is remarkably improved through the synergistic effect of the chemical repairing material and the biological spores in the capsule core; the dynamic cross-linked network endows the capsule wall with self-healing ability, resists physical damage, improves the durability of the concrete, prolongs the service life of the concrete, also can enhance the wear resistance of the concrete, and reduces the wear in the use process.
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