High-strength polyurethane modified silicate grouting reinforcement material as well as preparation method and application thereof

Abstract

The invention provides a high-strength polyurethane modified silicate grouting reinforcement material as well as a preparation method and an application thereof, relates to a grouting reinforcement material adopting alkali metal silicate as a raw material and aims to provide the high-strength polyurethane modified silicate grouting reinforcement material which is low in cost, simple to prepare, low in reaction temperature and good in environmental protection, as well as the preparation method and the application of the high-strength polyurethane modified silicate grouting reinforcement material. The high-strength polyurethane modified silicate grouting reinforcement material comprises a component A and a component B, wherein the component A comprises a sodium silicate solution and a catalyst; the component B comprises polymeric MDI (methylene diphenyl diisocyanate), polyether polyol and a promoter. With application of the invention, the component A and the component B are mixed and cast in an isovolumetric manner. The preparation method of the grouting reinforcement material is simple and easy to operate. The grouting reinforcement material has low reaction temperature and free from high-temperature potential safety hazard; meanwhile, the material doesn't contain fire retardant ingredients, and environmental pollution is reduced. The grouting reinforcement material is used for rock soil reinforcement in the fields such as coal bed geology, water conservancy and hydropower, underground construction, subway tunnels and the like.

Description

technical field [0001] The invention relates to a grouting reinforcement material with alkali metal silicate as raw material, in particular to a grouting reinforcement material with polyurethane modified silicate for geological reinforcement. Background technique [0002] Sodium silicate grouting reinforcement material is one of the most widely used chemical grouting reinforcement materials, especially its environmental protection has been valued by countries all over the world. With the development of water glass grouting reinforcement technology, a series of water glass grouting reinforcement technologies have been developed. For example, by adding two different emulsifiers to water glass and ethyl acetate, mixing them to form a water glass-ethyl acetate microemulsion chemical grouting reinforcement material, which has high strength, low cost, no pollution, and the gel time can be shortened. control and other advantages, especially suitable for use in drilling arm pluggin...

AI Technical Summary

Problems solved by technology

[0003] The biggest advantage of water glass grouting reinforcement material is low cost, but the disadvantage is that the strength of water glass grouting reinforcement material is low after consolidation, and it cannot solve engineering technical problems in some specific environments, and it cannot replace some chemical grouting reinforcement material

In addition, the durability of the water glass slurry material is low. After the water glass gel is solidified, the unreacted water glass is precipitated after the gel, causing syneresis, resulting in a decrease in impermeability, and thus a decrease in durability.

[0004] The products prepared by the prior art can also be used in the reinforcement and sealing treatment of broken coal seams and rock formations in various poorly ventilated coal mines, tunnels, and rock formations, but they are usually modified MDI, and the material properties are not stable enough. The compounding factor has a great influence, thus affecting the strength of the material, as described in Silicate Modified Polyurethane Polymer Material and Its Preparation Method (201210508913.5) and An Inorganic Modified Polyurethane Grouting Material and Its Preparation Method (201310237745.5) The product

Or for safety, add flame retardants, such as the patent named as low-temperature safe polyurethane grouting material for coal and rock mass reinforcement and its preparation method (201210508997.2), the addition of flame retardants will pollute the environment

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