Self-expanding water shutoff material for tunnel and preparation method of self-expanding water shutoff material

Through the combination of nanocomposite modified polyurethane, epoxy acrylate and highly absorbent resin, the shortcomings of traditional water blocking materials in terms of expansion rate, water resistance, bonding strength and curing time are solved, and the efficient and stable sealing effect of tunnel water blocking materials is achieved.

CN120574477APending Publication Date: 2025-09-02CHONGQING JIAOTONG UNIV +1
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Patent Information

Application Number
CN202510870660.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-26
Publication Date
2025-09-02

AI Technical Summary

Technical Problem

Traditional water blocking materials have insufficient expansion rate, poor water resistance, low bonding strength to surrounding rock and long curing time, so they cannot efficiently fill complex cracks in tunnels and seal them stably for a long time.

Method used

By nanocomposite and crosslinking modification of polyurethane and epoxy acrylate, a highly absorbent resin is introduced, and a filler and additives are combined to form a self-expanding water-blocking material with high expansion rate and strong water resistance.

Benefits of technology

It has achieved efficient filling of complex cracks in the tunnel, long-term stable sealing, excellent water resistance, significant improvement in bonding strength, rapid curing, and adapting to the water blocking needs of complex tunnel environments.

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Abstract

The invention discloses a self-expanding water shutoff material for tunnels and a preparation method of the self-expanding water shutoff material, and belongs to the field of polymer composite materials. Modified polyurethane in the self-expanding water shutoff material is prepared through vacuum dehydration of polyether glycol, chain extension of diisocyanate, reaction of a carboxyl-containing chain extender and acetone, dropwise addition and grafting of nano silicon dioxide dispersion liquid, neutralization of triethylamine and reduced pressure distillation. The modified epoxy acrylate is prepared by mixing epoxy resin and methyl methacrylate, stirring a silane coupling agent and an absolute ethyl alcohol solution, initiating polymerization by benzoyl peroxide, dropwise adding nano-montmorillonite dispersion liquid for reaction, stirring acrylic acid and a polymerization inhibitor hydroquinone, and performing reduced pressure treatment. The material formula comprises the two modified macromolecules, super absorbent resin, a filler, a plasticizer, an initiator, a cross-linking agent, a defoaming agent and deionized water. The prepared material has the advantages of high expansion rate, excellent water resistance, strong adhesive property and controllable curing time, and is suitable for the scenes of tunnel water inrush plugging, lining crack repairing, water-rich fault zone advanced grouting and the like.
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