Hydrophilic polyurethane composite grouting liquid with high strength of consolidation body and preparation method of hydrophilic polyurethane composite grouting liquid

Abstract

The invention discloses hydrophilic polyurethane composite grouting liquid with high strength of a consolidation body. After being modified organically, nano silicon dioxide is added in raw materials, can be dispersed uniformly and cannot be agglomerated easily, while the performance of the traditional polyurethane grouting liquid is kept basically, the thermal decomposition temperature and the residual mass of the hydrophilic polyurethane composite grouting liquid are obviously higher than those of the traditional polyurethane grouting liquid, active modifiers such as modified calcined kaolin, glass fibers and bisphenol A epoxy resin are further added, various components are mutually dispersed uniformly and do not sink, while the viscosity of the composite grouting liquid is improved, the strength of the consolidation body is further improved, the hydrophilic polyurethane composite grouting liquid can be quickly injected and permeates in tiny gaps of drift sand or sludge to form the consolidation body with certain strength, and accidents such as sand permeation, roof fall and rib spalling in a tunneling process are prevented.

Description

technical field [0001] The invention relates to the technical field of grouting materials, in particular to a hydrophilic polyurethane composite grouting liquid with high strength of consolidated body and a preparation method thereof. Background technique [0002] In the process of coal mine production, geological structures such as faults, folds, and fracture development zones are often encountered. The coal and rock masses are loose and broken, and large-scale roof caving and water inrush accidents are prone to occur, which seriously threatens the safe production of coal mines. Therefore, there is an urgent need for effective broken coal and rock mass reinforcement materials and technologies to solve this outstanding problem that affects the safety and efficiency of coal mines. At present, grouting technology is often used to reinforce the broken coal and rock mass and increase the support strength of the roadway. According to the grouting materials, it can be divided int...

AI Technical Summary

Problems solved by technology

However, due to its small size and large specific surface area, nano-silica is easy to agglomerate and disperse unevenly in hydrophilic polyurethane. It is necessary to modify the surface of nano-silica before adding it to the raw material. The requirements are getting higher and higher, and the performance index of the composite grouting prepared in this paper can not meet the above requirements at all, so it is necessary to modify the existing production process and raw material ratio