Water-dispersion-resistant polyurethane rigid foam grouting water-stop reinforcing material and preparation method thereof

Abstract

The invention discloses a water-dispersion-resistant polyurethane rigid foam grouting water-stop reinforcing material and a preparation method thereof. The material comprises a component A and a component B, wherein the component A comprise, by weight, 210-230 parts of isocyanate, 7-14 parts of polyvinyl acetate, 4-10 parts of a solvent and 0-10 parts of a foaming agent; and the component B comprises, by weight, 100 parts of polymer polyol, 20-25 parts of a plasticizer, 10-27 parts of a chain extender, 0-10 parts of a foaming agent, 1-2 parts of a foam stabilizer and 1-1.5 parts of a catalyst.The preparation method comprises the following steps: proportionally mixing the component A and the component B, and uniformly stirring. The reinforcing material has good water-resistant dispersibility, is not easily dispersed by water in a flowing water body, has high strength, good durability, adjustable curing time and low price, is suitable for plugging gushing water and jet flow, and has good economy, safety and environmental protection property, and the compressive strength of pure foam is not less than 2 MPa.

Description

technical field [0001] The application belongs to the technical field of composite materials, and in particular relates to a water-resistant dispersion type polyurethane rigid foam grouting water-stop reinforcement material and a preparation method. Background technique [0002] Water inrush is often encountered in tunnel and mining projects, which can easily cause disasters such as surrounding rock instability and side slope landslides, which not only cause casualties, property losses, and delays in construction schedules, but also affect the long-term stability of engineering structures and deteriorate construction conditions. and damage the surrounding ecological environment. Grouting and water-stop reinforcement technology is one of the most commonly used and effective means to improve the mechanical properties and stability of loose or water-bearing strata, as well as to prevent and control landslides, seepage, water gushing, mud inrush and quicksand. [0003] At prese...

AI Technical Summary

Problems solved by technology

[0004] Polyurethane grouting materials can be divided into water-reactive and non-water-reactive. Water-reactive polyurethane grout swells and solidifies when it encounters water. It is suitable for conventional plugging treatment, but it is easy to be washed away by water, and it is difficult to block water gushing or jet flow. The process requires water to participate in the reaction and the characteristics of the consolidated body are easy to hydrolyze, resulting in poor strength and durability, which poses a potential threat to the long-term stability of the project; non-water reactive polyurethane slurry has good hydrophobicity and hydrolysis resistance stability, and stable performance , not affected by the water content of the grouting environment, suitable for blocking water gushing or jet flow, but still has the problem of poor water dispersion resistance, which is easy to cause pollution to water sources and the surrounding ecological environment

Images