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Gas hole-sealing material used in coal mine well and preparation method thereof

A sealing material and gas technology, applied in the field of gas sealing material and its preparation, to achieve the effects of long setting time, improving interface performance, and reducing easy shrinkage and dry cracking

Inactive Publication Date: 2019-09-20
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a gas sealing material used in underground coal mines. A new gas sealing material used in underground coal mines is prepared by combining the two sealing methods of cement mortar sealing and polyurethane sealing. To solve the disadvantages of the two methods of sealing holes

Method used

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  • Gas hole-sealing material used in coal mine well and preparation method thereof
  • Gas hole-sealing material used in coal mine well and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A gas sealing material for underground coal mines, made of the following components by weight: Portland cement 300g, humic acid modified polyurethane 80g, basalt fiber 40g, carboxymethyl cellulose 1g, RSD-8 type High-efficiency water reducer 3g, silane coupling agent KH560 3g.

[0033] The specific preparation method is as follows:

[0034] Step 1, prepare humic acid modified polyurethane

[0035] 3g humic acid is dissolved with 50g of N,N'-dimethylformamide to obtain humic acid solution;

[0036] Mix 50g of isophorone diisocyanate and 53g of humic acid solution, heat to 60°C for 3 hours, then add 200g of polyether polyol NJ-210 and 10g of 2,2-dimethylol propionic acid, mix Evenly, add 3g of dibutyltin dilaurate dropwise at a rate of 1 drop / s, react at 80°C for 3 hours, and then the temperature drops to 40°C, then add triethylamine to neutralize to a pH of 7.2 to obtain a prepolymer;

[0037] adding an aqueous solution of ethylenediamine with a mass concentration of ...

Embodiment 2

[0044] A gas sealing material for underground coal mines, made of the following components in parts by weight: Portland cement 200g, humic acid modified polyurethane 100g, basalt fiber 30g, carboxymethyl cellulose 1.5g, RSD -8 type superplasticizer 1g, silane coupling agent KH560 5g.

[0045] The specific preparation method is the same as in Example 1, except that the formula in Example 1 is changed to that of Example 2.

Embodiment 3

[0047] A gas sealing material for underground coal mines, made of the following components in parts by weight: Portland cement 400g, humic acid modified polyurethane 50g, basalt fiber 50g, carboxymethyl cellulose 2g, RSD- Type 8 superplasticizer 5g, silane coupling agent KH560 1g.

[0048] The specific preparation method is the same as in Example 1, except that the formula in Example 1 is changed to that of Example 3.

[0049]In order to further illustrate the effects of the present invention, the present invention also provides comparative examples, specifically as follows.

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PUM

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Abstract

The invention discloses a gas hole-sealing material used in a coal mine well. The material is prepared by the following components, by weight: 20-40 parts of portland cement, 5-10 parts of humic acid modified polyurethane, 3-5 parts of basalt fibers, 0.1-0.2 part of a water-retaining agent, 0.1-0.5 part of a water reducing agent, and 0.1-0.5 part of a coupling agent. In addition, the invention also provides a preparation method of the gas hole-sealing material used in the coal mine well. The gas hole-sealing material prepared by the preparation method of the invention has the advantages of long setting time, high strength and good flow stability, can seal tiny cracks, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation of sealing materials, and in particular relates to a gas sealing material used in underground coal mines and a preparation method thereof. Background technique [0002] The geological conditions of coal seams in my country are complex, and most mines have high gas and low air permeability. With the increasingly complex mining environment of coal mines, coal mines pay more and more attention to gas prevention and control. Among them, the early drainage of coal seam gas is to prevent An important means of gas, the better the effect of pre-drainage, the higher the drainage ratio, the better the environment during mining, and the lower the possibility of accidents. In all aspects of gas drainage, the plugging of the drainage borehole is a key link. [0003] At present, the sealing methods of drainage drilling mainly include cement mortar sealing method and polyurethane sealing method. Cement morta...

Claims

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Application Information

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IPC IPC(8): C04B28/04C09K8/467
CPCC04B28/04C04B2111/00724C04B2201/50C09K8/467C09K2208/08C04B24/282C04B14/46C04B24/383C04B24/42C04B2103/302C04B24/00C04B24/129C04B24/125C04B24/32C04B24/06C04B24/40C04B24/121
Inventor 陈立伟裴蓓王林袁军伟刘军任发科陈向军高保彬许彦鹏王笑天史庆元
Owner HENAN POLYTECHNIC UNIV
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