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Improved coal mine polyurethane blocking material and preparation method thereof

A plugging material, polyurethane technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of secondary hazards to the safety of underground workers, insufficient expansion, low expansion multiple, etc., to reduce the cost of synthesis process , Expansion multiple increase, the effect of great compactness

Inactive Publication Date: 2016-02-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyurethane material is a polymer injection material with good effect developed in recent years for coal mine plugging and reinforcement. Compared with traditional injection materials such as epoxy resin and acrylamide, it has high consolidation strength and moderate viscosity. However, due to its complex synthesis process and low expansion ratio, the currently developed polyurethane materials for coal mines still have problems such as relatively high price and insufficient expansion in cracks, and due to the selection of synthetic raw materials , so that the product has a certain potential threat of toxic and side effects, causing secondary harm to the safety of underground workers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Dissolve 1 g of dimethylolpropionic acid and 0.3 g of triethylenediamine in 23.7 g of dimethyl methylphosphonate, and stir until the system is stable and no precipitate exists.

[0023] 2) Add 25g of polyether 403 to the solution obtained in step 1), and stir until the solution is clear without any floc and granular substances, and this solution is regarded as component A.

[0024] 3) Take 50g of diphenylmethane diisocyanate as component B. When in use, components A and B are evenly mixed to obtain the polyurethane plugging material for coal mines.

[0025] The obtained polyurethane plugging material has a consolidation time of 80 s, an expansion ratio of 3.5, and a compressive strength of 59 MPa.

Embodiment 2

[0027] 4) Dissolve 1.25g of dimethylolpropionic acid and 0.3g of triethylenediamine in 20g of dimethyl methylphosphonate, and stir until the system is stable and no precipitate exists.

[0028] 5) Add 33.45g of polyether 403 to the solution obtained in step 1), and stir until the solution is clear without any floc and granular substances, and this solution is regarded as component A.

[0029] 6) Take 45g of diphenylmethane diisocyanate as component B. When in use, components A and B are evenly mixed to obtain the polyurethane plugging material for coal mines.

[0030] The obtained polyurethane plugging material has a consolidation time of 100 s, an expansion ratio of 2.2, and a compressive strength of 55 MPa.

Embodiment 3

[0032] 7) Dissolve 0.75g of dimethylolpropionic acid and 0.3g of triethylenediamine in 28.95g of dimethyl methylphosphonate, and stir until the system is stable and no precipitate exists.

[0033] 8) Add 30g of polyether 403 to the solution obtained in step 1), and stir until the solution is clear without any floc and granular substances, and this solution is regarded as component A.

[0034] 9) Take 40g of diphenylmethane diisocyanate as component B. When in use, components A and B are evenly mixed to obtain the polyurethane plugging material for coal mines.

[0035] The solidification time of the obtained polyurethane plugging material is 61s, the expansion ratio is 4.0, and the compressive strength is 52MPa.

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Abstract

The invention relates to an improved coal mine polyurethane blocking material and a preparation method thereof, and belongs to the technical field of underground-mine crack blocking reinforcement materials. The improved coal mine polyurethane blocking material comprises a component A and a component B, wherein the components A comprises a polyether polyol, a diluent, a cross-linking agent and a catalyst, and the component B is diphenyl methane diisocyanate. According to the present invention, under the premise of no influence on the consolidation strength required by the polymer pressing injection blocking material, the obtained polyurethane consolidation body has the significantly-improved expansion multiple, such that the higher tightness of the product during the crack filling process compared to other products is ensured; the material reaction curing is rapid, such that the rapid blocking filling under the complex underground mine condition is ensured; the related raw materials have characteristics of no pollution, no volatile toxicity and no harm to human body, such that the personal safety of the underground mine workers is ensured; and the preparation process is simple, and the curing foaming is performed at the normal temperature, and the original synthesis process cost of the polyurethane blocking material is reduced.

Description

technical field [0001] The invention relates to an improved polyurethane material for plugging and reinforcing underground coal mines and a preparation method thereof, and belongs to the technical field of crack sealing and reinforcing materials for underground coal mines. Background technique [0002] my country is a country rich in coal resources and a large number of coal mines. However, in the actual production and operation of coal mines, due to the complex geological structure and the vibration of underground mining machines, coal mine safety accidents such as roof fall and collapse continue to occur, seriously threatening It affects the personal safety of coal mine workers and restricts the healthy development of the coal industry. In addition to using the most traditional mechanical support methods to solve threats such as roof caving and subsidence in coal mines, polymer pressure injection materials used to seal and strengthen large coal and rock cracks are being use...

Claims

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Application Information

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IPC IPC(8): C08G18/48C08G18/66C08G18/34C08G18/76C09K8/44
CPCC08G18/48C08G18/348C08G18/6692C08G18/7671C09K8/44
Inventor 索红莉苏健张腾马麟樊彦艳贾强郭艾东
Owner BEIJING UNIV OF TECH
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