Low-viscosity high-flash-point waterborne polyurethane water shutoff material and preparation method thereof

Abstract

The invention discloses a low-viscosity high-flash-point waterborne polyurethane water shutoff material and a preparation method thereof. The polyurethane water shutoff material comprises the following materials in parts by weight: 80 to 120 parts of waterborne polyether polyol, 20 to 30 parts of isocyanate, 0.05 to 0.5 part of catalyst, 25 to 35 parts of inert diluents, and 1.0 to 1.5 parts of cross-linking agent. The preparation method comprises the following steps of: dehydrating the waterborne polyether polyol, performing hybrid reaction on the dehydrated waterborne polyether polyol, the isocyanate and the catalyst till that the content of the NCO in a detection system is not reduced any more, adding the inert diluents into the mixture, uniformly mixing, and adding the chain-extension cross-linking agent into a certain quantity of water to form another component when the water shutoff material is used. The waterborne polyurethane water shutoff material has the characteristics of high water absorption capability, high flash point, no combustion, low viscosity, environment friendliness and the like; and the preparation method is simple and facilitates construction. The waterborne polyurethane water shutoff material is applicable to treatment on flowing water and gushing water as well as prevention and treatment on water seepage of underground works such as mine roadways, shafts, tunnels, subsea tunnels and subways.

Description

1. Technical field [0001] The invention relates to a polyurethane material and a preparation method thereof, in particular to a low-viscosity high-flash point water-based polyurethane water blocking material and a preparation method thereof. 2. Background technology [0002] At present, polyurethane grouting anti-seepage curtains are often used in the excavation of mine roadways, shafts, tunnels, subsea tunnels, subways and other underground projects to control water gushing or prevent seepage and plugging. The anti-seepage of dam body and dam foundation, water seepage around foundation pit and base water and sand inrush can also be treated by polyurethane grouting method. Commonly used plugging materials include water glass, acrylamide, methacrylate / acrylate, modified epoxy resin, furfurone resin, lignin, etc. [0003] Polyurethane chemical water blocking material is a new anti-seepage and plugging consolidation material developed after acrylamide and epoxy resin slurry ma...

AI Technical Summary

Problems solved by technology

[0004] In order to reduce the viscosity of polyurethane and improve the groutability, commonly used polyurethane grouting materials contain a large amount of organic solvents, such as acetone, xylene, toluene, butanone, ethyl acetate, butyl acetate, etc. Not only does it cause serious environmental pollution, but it is also detrimental to the health of construction workers. It also poses a serious threat to the safety of production in coal mines. The solvent evaporates into the air, which is prone to combustion and explosion accidents.

In recent years, domestic counterparts have increasingly intensified the research on polyurethane water blocking materials, but most of them are limited to basic research, and there are more researches on the water inclusion and curing time of materials, and they have not considered various problems in the construction process.