A mine-used rapid plugging polyurethane foam material and preparation method thereof

Abstract

The invention discloses a mine-used rapid plugging polyurethane foam material and a preparation method thereof, belonging to mine-used polymer materials. The technical solution is composed of A-component composite material and B-component composite material; the above-mentioned component A composite material and B-component composite material are respectively packed in two metal steel cylinders A and B, and are supplied to the two metal cylinders A and B respectively. Nitrogen is filled in the middle to pressurize, and the pressure inside the metal cylinder A is controlled to be 2.0-2.1Mp.a, and the pressure inside the metal cylinder B is 2.1-2.2Mp.a, and then the materials A and B are passed through the spray gun at a mass ratio of 1:1 , ‑NCO:‑OH=1.09~1.25:1 The molar ratio of reactive groups is mixed and sprayed. After the A and B materials are mixed through the nozzle of the spray gun, the rapid plugging polyurethane foam material for mining can be formed. The invention makes the polyurethane foam formed by spraying have good toughness and bonding strength, and enhances the plugging and sealing effect.

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