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Thin spray material and preparation method for roadway reinforcement sticky dust

A technology of sticky dust and thin spraying, applied in the direction of coating, etc., can solve the hidden dangers of production safety, reduce support strength, peeling and other problems, and achieve the effect of wide application range, enhanced support strength and protection of safety

Active Publication Date: 2020-08-04
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the special environment of mines such as high stress, high temperature, high humidity, and continuous wind supply, the surrounding rock of the roadway is very prone to weathering, thereby reducing the support strength
After anchor net support, concrete or mortar will be sprayed for airtight isolation, but the sprayed concrete and mortar will peel off and open in a large area, which poses a serious threat to the stability of the roadway, greatly reduces the service life of the roadway, and brings safety to production. Hidden danger
The roadway will increase the support strength through local grouting, spraying cement slurry and other means, but there are disadvantages of high labor intensity and many materials and consumables
[0003] In addition, during underground ventilation, in addition to the air flow itself carrying a certain amount of dust, it will also cause secondary dusting of deposited dust, and the dust-laden air flow will enter the mining operation area, seriously threatening the occupational health of miners
Therefore, methods such as spreading rock powder, cleaning and flushing, and roadway brushing are generally used to prevent floating dust from flying, but the disadvantages are large water consumption, harsh operating environment, and great manpower and material resources.
However, the technical means of preparing reinforced sticky dust thin-sprayed materials based on the graft copolymerization method of sodium carboxymethyl cellulose-polyaluminum chloride has not been reported yet.

Method used

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  • Thin spray material and preparation method for roadway reinforcement sticky dust
  • Thin spray material and preparation method for roadway reinforcement sticky dust
  • Thin spray material and preparation method for roadway reinforcement sticky dust

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preparation example Construction

[0027] The present invention also provides a preparation method for roadway reinforcement sticky dust thin spray material, such as figure 1 As shown, it includes the following steps:

[0028] Step 1, add acrylic acid with a neutralization degree of 60% into the reaction vessel, weigh sodium carboxymethylcellulose and slowly add a small amount of sodium carboxymethylcellulose into the reaction vessel under stirring, until the sodium carboxymethylcellulose is completely dissolved to form the first a solution;

[0029]

[0030] Step 2, the above-mentioned first solution is placed in a stirrer and fed with nitrogen for protection, and the reaction temperature is set to the first solution

[0031] Ammonium persulfate was added in the first solution, and after 2 hours of reaction, the second solution was formed;

[0032]

[0033] Step 3, after weighing polyaluminum chloride, dissolve it in a corresponding container, slowly pour the polyaluminum chloride solution into the agi...

Embodiment 1

[0041] Put the beaker containing 300ml of water in a water bath, adjust the temperature to 50°C, add acrylic acid with a neutralization degree of 60% into the beaker, and weigh 2.5g of sodium carboxymethylcellulose slowly in a stirring state. Add it into a beaker, wait until the sodium carboxymethylcellulose is completely dissolved, place the reactant in a stirrer and pass through nitrogen for protection, set the reaction temperature to 50°C, add 0.05g of ammonium persulfate, react for 2 hours, weigh 0.5g Dissolve the polyaluminum chloride solution in a small beaker, then slowly pour the polyaluminum chloride solution into a stirrer, adjust the pH value to 8, continue stirring for 1 hour, and then add an appropriate amount of hydrochloric acid to obtain a thin spray material for reinforcing sticky dust.

Embodiment 2

[0043] Put the beaker containing 300ml of water in a water bath, adjust the temperature to 50°C, add acrylic acid with a neutralization degree of 60% into the beaker, and weigh 2.5g of sodium carboxymethylcellulose slowly in a stirring state. Add it into a beaker, wait until the sodium carboxymethylcellulose is completely dissolved, place the reactant in a stirrer and feed it with nitrogen for protection, set the reaction temperature to 50°C, add 0.04g ammonium persulfate, react for 2 hours, weigh 0.4g Dissolve the polyaluminum chloride solution in a small beaker, then slowly pour the polyaluminum chloride solution into a stirrer, adjust the pH value to 8, continue stirring for 1 hour, and then add an appropriate amount of hydrochloric acid to obtain a thin spray material for reinforcing sticky dust.

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Abstract

The invention discloses a thin spraying material for reinforcement and dust sticking of a roadway and a preparation method. The thin spraying material comprises 5% to 10% of sodium carboxymethylcellulose, 10% to 15% of acrylic acid, 20% to 25% of polyaluminum chloride, 0.05% to 0.1% of an initiator, 0.01% to 0.05% of hydrochloric acid, 0.01% to 0.05% of an initiator, 0.01% to 0.05% of a cross-linking agent and the balance of water. The sodium carboxymethylcellulose is used as a matrix, reacts with the acrylic acid by grafting modification to form an intermediate product, and then a strong spraying material is prepared from the intermediate product and the polyaluminum chloride under the coordinating chelating action; and when the thin spraying material is sprayed to concrete and the surface of an anchor net, the thin spraying material can take effects of carrying out secondary reinforcement on surrounding rocks and preventing air leakage of the roadway, supporting intensity of the roadway can be greatly improved and a great volume of dust carried in wind flow can be greatly stuck.

Description

technical field [0001] The invention relates to the field of mine dust prevention, in particular to a thin spray material and a preparation method for reinforcing sticky dust in roadways. Background technique [0002] Due to the special environment of mines such as high stress, high temperature, high humidity, and continuous wind supply, the surrounding rock of the roadway is very prone to weathering, thereby reducing the support strength. After anchor net support, concrete or mortar will be sprayed for airtight isolation, but the sprayed concrete and mortar will peel off and open in a large area, which poses a serious threat to the stability of the roadway, greatly reduces the service life of the roadway, and brings safety to production. Hidden danger. The roadway will increase the support strength by means of local grouting and spraying cement slurry, but there are disadvantages of high labor intensity and many materials and consumables. [0003] In addition, during unde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D187/00C08G83/00C08F251/02C08F220/06
CPCC08F251/02C08G83/008C09D187/00C08F220/06
Inventor 周刚李帅龙高丹红孙健宋淑郑韩伟波
Owner SHANDONG UNIV OF SCI & TECH