Polyvinyl alcohol foam oxygen insulation material and preparation method and application thereof

Abstract

The invention discloses a polyvinyl alcohol foam oxygen insulation material, which comprises a component (A) and a component (B), wherein the component (A) comprises a solvent, and 3-8 percent by weight of polyvinyl alcohol, 0.5-1.5 percent by weight of linear hydrocarbon organic alcohol or ester and 0.04-0.10 percent by weight of foaming agent based on the total amount of the solvents contained in the component (A) and the component (B); the component (B) comprises 0.1-0.3 percent by weight of borate based on the total amount of solvents contained in the component (A) and the component (B); and the mass ratio of the solvent contained in the component (A) to the solvent contained in the component (B) is (5-9):1. A method for preparing the polyvinyl alcohol foam oxygen insulation material comprises the following steps of: dissolving polyvinyl alcohol into the solvent at constant temperature 70-95 DEG C, performing return flow agitation for 30-60 minutes, cooling to room temperature, and adding the linear hydrocarbon organic alcohol or ester and the foaming agent to obtain the component (A); adding borate into the solvent to obtain the component (B); and foaming the component (A), spraying onto a coal surface and spraying the component (B) to form a foam gel oxygen insulation material layer which plays a good role in sealing and insulating oxygen on the coal surface.

Description

technical field [0001] The invention relates to a fireproof material, in particular to a polyvinyl alcohol (PVA) oxygen barrier material for preventing spontaneous combustion of coal. Background technique [0002] Coal spontaneous combustion is one of the major disasters that threaten the safety of coal mines and coal transportation. Among the key state-owned coal mines in our country, the mines with the danger of spontaneous combustion account for about 51.3%, and the fires caused by coal spontaneous combustion account for more than 90% of the total number of fires, which seriously threaten the safety of people's lives and properties. Spontaneous combustion of coal produces a large amount of SO 2 、H 2 S, CO and CO 2 gas, seriously polluting the environment. The redox reaction between coal and oxygen in the air is the main reason for coal self-heating and spontaneous combustion, so controlling the reaction process of coal and oxygen is an important means to prevent coal ...

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Problems solved by technology

The inventors have further studied and found that when the polyvinyl alcohol modified foaming solution prepared by adding modifiers and foaming agents is sprayed on the coal surface after being foamed by a foaming device, although a certain oxygen barrier effect can be obtained , but the formed foam material is extremely unstable, easy to break, and cannot be used for long-term storage and long-distance transportation of coal; considering that polyvinyl alcohol is very sensitive to borates and easily causes gelation, it will be added by adding modifiers and The modified polyvinyl alcohol oxygen barrier gel material prepared with borate as a coagulant is sprayed on the coal surface to form a gel film on the coal seam surface. However, due to the poor fluidity of this oxygen barrier gel material, When the coal surface is covered with a certain thickness of gel film, the use of oxygen barrier materials is relatively large, and the cost of use increases

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