Microcapsule polymer grouting material, preparation method thereof and double-stage trigger grouting method

By using microcapsule polymer grouting materials and a two-stage triggered grouting method, and utilizing a composite network of slow-release microcapsules and nanocellulose, the problems of excessively fast reaction speed and unsustainable repair of polymer grouting materials were solved, achieving dynamic tracking repair and long-term sealing of cracks.

CN122167694APending Publication Date: 2026-06-09SINOHYDRO BUREAU 5 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SINOHYDRO BUREAU 5
Filing Date
2026-03-30
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing polymer grouting materials react too quickly, making it difficult to control the expansion and solidification process. They cannot fully fill fine cracks and cannot continuously track and repair active cracks caused by load changes or temperature contraction, which easily leads to leakage channels.

Method used

By employing microcapsule polymer grouting materials and a two-stage triggered grouting method, reactants are released in stages through slow-release microcapsules. Combined with nanocellulose and metakaolin to construct a micro-nano composite network, the toughness and rigidity of the material are synergistically optimized, enabling dynamic repair capabilities.

Benefits of technology

It extends the effective working time of the material in the crack, ensures full filling of the fine cracks, can continuously adapt to crack expansion, prevents the formation of leakage channels, and achieves long-term repair.

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Abstract

This invention discloses a microcapsule polymer grouting material and its preparation method, as well as a two-stage triggered grouting method, belonging to the field of engineering materials and crack repair technology. The invention includes a grout and a polymethylene polyphenyl polyisocyanate; the grout consists of a first polyether polyol, sustained-release microcapsules, a rigid foam crosslinking agent, a modifier E51, water, a foaming catalyst, nanocellulose, and metakaolin. This invention introduces sustained-release microcapsule technology into the grouting material, storing the key reactant polyether polyol and creating a stepwise secondary reaction mechanism. This design effectively extends the workability of the grouting material and ensures initial permeability; more importantly, its sustained-release characteristics endow the material with the ability to continuously track and adaptively fill active cracks, achieving a leap from passive sealing to active tracking, greatly improving the durability and reliability of the repair effect.
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