Mining quick-plugging polyurethane foam material and preparation method thereof

Abstract

The invention relates to a mining quick-plugging polyurethane foam material and a preparation method thereof, and belongs to a mining polymer material. According to the technical scheme, the materialis composed of a component A combined material and a component B combined material, the method includes filling a metal steel cylinder A and a metal steel cylinder B with the component A combined material and the component B combined material respectively; respectively inflating nitrogen into the two metal steel cylinders A and B for pressurization and controlling the pressure in the metal steel cylinder A to be 2.0 to 2.1 Mpa and the pressure in the metal steel cylinder B to be 2.1-2.2 Mpa; mixing and spraying the material A and the material B through spray guns according to a mass ratio of 1: 1 and a ratio that the reaction group molar ratio of -NCO to -OH is 1.09-1.25:1, and mixing the material A and the material B through spray heads of the spray guns to form the quick-plugging polyurethane foam material for mining. According to the invention, the polyurethane foam formed by spraying has good toughness and bonding strength, and the plugging and sealing effects are enhanced.

Description

technical field [0001] The invention belongs to the field of polymer materials for mines, and in particular relates to a rapid plugging polyurethane foam material for mines and a preparation method thereof. Background technique [0002] The raw materials used in the rapid plugging devices currently on the market are mainly rigid foam polyether, diisocyanate, foam stabilizer, organic amine catalyst, organic tin catalyst, 141b blowing agent, etc. After 3 months of pressurized storage, some components in the combined material will decompose to produce acidic substances, which will reduce the catalytic effect, and also cause the foam stabilizer to decompose or even fail. The reactivity of A and B raw materials will decrease sharply. Flow will occur on the surface, and the polyurethane foam formed after the reaction has coarse cells, and the adhesion to the coal seam is reduced, so it cannot achieve a good sealing effect. For example, the organic flame retardant and organic tin ...

AI Technical Summary

Problems solved by technology

After 3 months of pressurized storage, some components in the combined material will decompose to produce acidic substances, which will reduce the catalytic effect, and also cause the foam stabilizer to decompose or even fail. The reactivity of A and B raw materials will decrease sharply. Flow will occur on the surface, and the polyurethane foam formed after the reaction will have coarse cells, and the cohesion with the coal seam will be reduced, which will not achieve a good sealing effect.

For example, the organic flame retardant and organic tin catalyst components in the raw materials will react with the trace moisture in the system to form acidic substances such as inorganic acids and organic acids, which will reduce the pH value of the raw materials; the acidic substances can also neutralize the tertiary amine catalyst, Deactivate part of the tertiary amine catalyst, resulting in increased reaction curing time; the organic acid will further undergo condensation reaction with polyether polyol, resulting in increased viscosity of the system, which will consume the hydroxyl groups in polyether polyol at the same time, making it compatible with A The number of reactive hydroxyl groups of the component diisocyanate decreases, thereby reducing the compressive strength of the cured product formed by the reaction