CN112999558B - Coal mine underground fire prevention and extinguishing material and preparation process thereof - Google Patents
Coal mine underground fire prevention and extinguishing material and preparation process thereof Download PDFInfo
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- A—HUMAN NECESSITIES
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- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
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- A—HUMAN NECESSITIES
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- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
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Abstract
The invention discloses a coal mine underground fire prevention and extinguishing material, which relates to the technical field of coal mine safety, and is prepared from the following raw materials in parts by weight: 10-12 parts of sodium alginate, 10-12 parts of hydroxyethyl carboxymethyl cellulose, 3-5 parts of fly ash, 15-18 parts of a cross-linking agent composite material, 3-5 parts of modified calcium sulfate whisker, 0.5-1 part of a foam stabilizer, 1-2 parts of a foaming agent and 160 parts of water 150-. The fire prevention and extinguishing material is simple in preparation process, low in cost, capable of performing all-stage omnibearing fire prevention and extinguishing, and excellent in fire prevention and extinguishing performance.
Description
Technical Field
The invention relates to the technical field of coal mine safety, in particular to a coal mine underground fire prevention and extinguishing material and a preparation process thereof.
Background
The coal mine exploitation amount in China is large, and in recent years, problems of fire, water, gas, dust and the like in mines are endless, so that the safety production of coal mines is very important. The mine fire disaster is large in harm degree, coal resources are wasted, and the life safety of operating personnel can be seriously threatened, so that the research on the underground coal mine fire prevention and extinguishing technology is significant, and coal mine safety accidents are reduced. The common coal mine fire prevention and extinguishing technology comprises grouting, water injection, leaking stoppage, spraying of a stopping agent, gel, foam injection and the like, and different methods have certain advantages and disadvantages, for example, the grouting is generally yellow mud or cement fly ash, the price is low, the toxicity is not high, the permeability is good, but the fluidity is poor, the pipeline is easy to block, and the gel is easy to crack in the later period, so that the fire prevention and extinguishing effect is lost. The gel fire prevention and extinguishing technology is a hot spot technology in recent years, gel materials comprise high polymer materials, water glass and the like, the gel forming time is short, the rheological property is moderate, gaps among crushed coal can be well filled, the purpose of isolating oxygen is achieved, the water retention property is good, the surface temperature of the coal can be reduced, water can be slowly lost at high temperature, a large amount of heat can be absorbed, cracking is not easy to occur after water loss, and the gel fire prevention and extinguishing technology also has the function of isolating oxygen; however, the raw materials such as water glass, or a high-molecular cross-linking agent, a monomer, an initiator and the like have high cost, the adhesion force with the surface of coal is poor when gel is formed in the early stage, and the shrinkage is easy after the water loss at high temperature in the later stage, so that the fire prevention and extinguishing effect is also influenced.
Based on this, in order to optimize the fire prevention and extinguishing effect, a great deal of research is being conducted on the composite fire prevention and extinguishing agent in the prior art. The ternary composite colloid fire prevention and extinguishing material is prepared by using rapid hardening sulphoaluminate cement and large-dosage fly ash as aggregate, using water glass as base material and adding suspending agent in the research on the preparation and performance of the ternary composite colloid fire prevention and extinguishing material for coal mines, and the like, wherein the initial setting time of a material cementing body is controllable within the range of 1-30 min, and the material cementing body has good early compressive strength; the inhibition rate at 60 ℃ reaches 90 percent, the inhibition rate at 70 ℃ reaches 80 percent, and the inhibition rate at 80 ℃ is not lower than 75 percent; a large amount of flocculated C-S-H gel exists in the cemented body and is connected with the fly ash through glue, the structure is compact, and the fire prevention and extinguishing effect is good; but the cost of water glass is relatively high.
Chinese patent document (application number 2018111265019) discloses a coal mine underground fire prevention and extinguishing agent and a preparation method thereof, wherein the coal mine underground fire prevention and extinguishing agent comprises the following raw materials in parts by weight: 0.1-10 parts of carboxymethyl cellulose, 0.1-15 parts of water reducing agent, 2-20 parts of hydrotalcite, 0-20 parts of potassium carbonate and 60-200 parts of fly ash. The preparation steps are as follows: (1) uniformly stirring carboxymethyl cellulose, a water reducing agent, hydrotalcite and potassium carbonate according to the formula dosage to obtain a mixture A; (2) adding the fly ash with the formula dosage into a mixture with a water-ash mass ratio of 3: 1-10: 1, stirring to obtain a mixture B, adding the powdery mixture A obtained in the step (1) into the mixture B, and uniformly stirring to obtain slurry, namely the underground coal mine fire prevention and extinguishing agent. The fire prevention and extinguishing agent prepared by the invention is green and environment-friendly, has excellent anti-flame performance, can quickly reduce the surface temperature of combustible materials during fire extinguishing, and has short fire extinguishing time and long fire extinguishing distance; however, the inhibition property is weak, and the fire-extinguishing effect at the early stage of gel formation and the later stage of high-temperature baking is not considered.
Disclosure of Invention
In view of the above, the invention aims to provide a coal mine underground fire prevention and extinguishing material, which is simple in preparation process, low in cost, capable of performing all-stage omnibearing fire prevention and extinguishing, and excellent in fire prevention and extinguishing performance, aiming at the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the underground coal mine fire preventing and extinguishing material is prepared from the following raw materials in parts by weight: 10-12 parts of sodium alginate, 10-12 parts of hydroxyethyl carboxymethyl cellulose, 3-5 parts of fly ash, 15-18 parts of a cross-linking agent composite material, 3-5 parts of modified calcium sulfate whisker, 0.5-1 part of a foam stabilizer, 1-2 parts of a foaming agent and 160 parts of water 150-.
Further, the foaming agent is prepared by mixing secondary alkyl sodium sulfonate and polyoxyethylene abietate according to the weight ratio of 1: 1.
Further, the cross-linking agent composite material is prepared by the following steps:
(1) uniformly mixing lactic acid and acetic acid, adding metal chloride, and stirring and reacting at 70-80 ℃ for 1h to obtain a mixed solution, wherein the molar ratio of the lactic acid to the acetic acid to the metal chloride is 2:4: 1;
(2) spraying the mixed solution into bentonite, fully stirring, air drying and crushing to obtain a product; the weight ratio of the bentonite to the mixed solution is 1: 8-10.
Further, the metal chloride is formed by mixing aluminum chloride and zinc chloride according to the weight ratio of 2: 1.
Further, the foam stabilizer is prepared from the following raw materials in parts by weight: 8-12 parts of silicon carbide, 6-9 parts of vitrified micro bubbles, 1-2 parts of nonylphenol polyoxyethylene ether, 1-2 parts of fatty acid polyoxyethylene monoester and 16-25 parts of water.
Furthermore, the grain diameter of the silicon carbide is 5-10 μm and 20-30 μm respectively accounting for 50%, and the grain diameter of the vitrified micro bubbles is 0.1-0.2 mm.
Further, the modified calcium sulfate whisker is prepared by the following steps: uniformly mixing sodium tetraborate decahydrate and trioctyl phosphate, dropwise adding a zinc nitrate solution, stirring at 70-80 ℃ for 1h, adjusting the pH value to 8.0, adding calcium sulfate whiskers, stirring for reaction for 7-8h, filtering, washing to be neutral, and drying at low temperature to obtain a product; the weight ratio of the sodium tetraborate decahydrate to the trioctyl phosphate to the zinc nitrate to the calcium sulfate whisker is 2: 1: 4: 8-10.
A preparation process of a coal mine underground fire prevention and extinguishing material comprises the following steps:
(1) stirring and mixing sodium alginate, hydroxyethyl carboxymethyl cellulose, fly ash and half of water for 15-20 min;
(2) stirring the foam stabilizer, the foaming agent and one third of water at a high speed for 15-20min, then adding the mixture and the rest raw materials into the mixture obtained in the step (1), and uniformly stirring to obtain the product.
The invention has the beneficial effects that:
1. the application discloses fire prevention and extinguishing material belongs to compound gel fire prevention and extinguishing material, adopts macromolecular material, fly ash, cross-linking agent composite, calcium sulfate whisker, foamer etc. to mix and prepare and form, and the raw materials is with low costs, and preparation technology is simple, and reaction condition is mild, and various raw materials synergism prevent putting out a fire in all directions, and the fire prevention and extinguishing material of final preparation hinders the melting behavior and excels in, and the gel thermal stability is high, and the fire prevention effect is showing.
2. Wherein the sodium alginate, the hydroxyethyl carboxymethyl cellulose and the fly ash have wide raw material sources, low cost, economy and environmental protection. The coordination crosslinking conditions of the sodium alginate, the hydroxyethyl carboxymethyl cellulose and the metal ions are mild, the process is simple, and the method is suitable for large-scale production. The sodium alginate molecule consists of a guluronic acid sugar unit and a mannuronic acid sugar unit, and metal ions can be crosslinked with the guluronic acid sugar unit and the mannuronic acid sugar through coordination bonds to form a network structure; the hydroxyethyl carboxymethyl cellulose has a large amount of hydroxyl and carboxylate radicals, which can not only physically cross-link with metal ions through hydrogen bonds, but also chemically cross-link with the metal ions to form a network gel structure; sodium alginate, hydroxyethyl carboxymethyl cellulose and metal ions can form interpenetrating gel network structure each other, and its water retention is good mechanical properties is excellent, can improve this application fire prevention and control effect greatly. The main component of the fly ash is silicon dioxide, various chemical bonds are formed with colloid in the hydration process, the mechanical property of a gel system is improved, and the fly ash has strong adhesion with coal and is easy to infiltrate down to the surface of the coal.
3. The metal cross-linking agent is a cross-linking agent composite material, because different metal cross-linking agents adapt different hydrolytic polymerization speeds, the gelling time is different, and the fire-preventing and fire-extinguishing material for the mine needs to be conveyed by a pipeline, the gelling time needs to be controlled in a reasonable range, so the metal cross-linking agent in the application is a composite cross-linking agent of two kinds of metal organic aluminum and organic zinc, the hydrolytic polymerization speeds of the organic aluminum and the organic zinc are different, and the metal cross-linking agent and the cross-linking of carboxyl have cooperative competition, the gelling speed can be uniform by composite use of the metal cross-linking agent, and the compactness and the strength of gel are enhanced; in order to delay the gelling time, the lactic acid, the acetic acid and the zinc-aluminum are adopted to form the organic metal cross-linking agent, so that the complexing stability is high, the gelling speed is stable, and the prepared gel has higher mechanical property.
In order to increase the slow release effect of the cross-linking agent, the bentonite is adopted to load the metal cross-linking agent, wherein the bentonite has a large specific surface area and a rich microporous structure, can adsorb the metal cross-linking agent, slowly releases in the swelling process, and can delay the gel formation time.
4. Because the macromolecule gel is coated on the surface of coal and then begins to gel, the fire prevention and extinguishing effect on the coal before the gel is formed needs to be considered, and the gel gradually loses water and also shrinks to a certain extent when being baked at a high temperature at a later stage. Thirdly, the foaming agent is added in the coal-fired boiler, a large amount of foam covers the surface of coal, and the coal-fired boiler plays a role in heat insulation and oxygen isolation in the early period. The foaming agent is compounded with a foam stabilizer, so that the stability and the durability of foam can be improved, and the specific mechanism is as follows: the foam stabilizer is added with silicon carbide particles and vitrified micro bubbles, so that the foam stabilizer is good in compatibility with fly ash, different in volume weight and particle size, capable of forming a space framework with staggered distribution, and the outer walls of the bubbles are uniformly adhered to the surfaces of the silicon carbide particles and the vitrified micro bubbles, not easy to merge, diffuse and collapse, and liquid films are distributed uniformly and not easy to break, thereby greatly delaying the breaking speed of the foam, increasing the stability of the foam, and greatly improving the fire extinguishing efficiency.
5. In consideration of the problem of later-stage gel thermal shrinkage, calcium sulfate whiskers are added in the gel system and uniformly dispersed in the gel system to form a network structure, so that the toughness and the mechanical property of the gel are improved. The calcium sulfate whisker is loaded with zinc borate, is dispersed in a gel system, is decomposed by high-temperature heat absorption, releases water vapor, boron oxide and the like, can reduce the surface temperature of coal, and can be melted and covered on the surface of the coal after the boron oxide begins to soften at the temperature of more than 300 ℃, thereby further playing the roles of isolation, fire prevention and extinguishment.
Detailed Description
The following examples are given for the purpose of illustrating the present invention, and the detailed embodiments and specific procedures are given for the purpose of implementing the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
The underground coal mine fire preventing and extinguishing material is prepared from the following raw materials in parts by weight: 10 parts of sodium alginate, 12 parts of hydroxyethyl carboxymethyl cellulose, 3 parts of fly ash, 15 parts of a cross-linking agent composite material, 3 parts of modified calcium sulfate whisker, 0.5 part of a foam stabilizer, 1 part of a foaming agent and 150 parts of water.
Wherein the foaming agent is prepared by mixing sodium secondary alkyl sulfonate and polyoxyethylene abietate according to the weight ratio of 1: 1.
The cross-linking agent composite material is prepared by the following steps:
(1) uniformly mixing lactic acid and acetic acid, adding metal chloride, and stirring and reacting at 70-80 ℃ for 1h to obtain a mixed solution, wherein the molar ratio of the lactic acid to the acetic acid to the metal chloride is 2:4: 1;
(2) spraying the mixed solution into bentonite, fully stirring, air drying and crushing to obtain a product; the weight ratio of the bentonite to the mixed liquor is 1:8.
The metal chloride is formed by mixing aluminum chloride and zinc chloride according to the weight ratio of 2: 1.
The foam stabilizer is prepared from the following raw materials in parts by weight: 8 parts of silicon carbide, 9 parts of vitrified micro bubbles, 1 part of nonylphenol polyoxyethylene ether, 2 parts of fatty acid polyoxyethylene ester and 16 parts of water.
The grain diameter of the silicon carbide is 5-10 μm and 20-30 μm respectively accounting for 50%, and the grain diameter of the vitrified micro bubbles is 0.1-0.2 mm.
The modified calcium sulfate whisker is prepared by the following steps: uniformly mixing sodium tetraborate decahydrate and trioctyl phosphate, dropwise adding a zinc nitrate solution, stirring at 70-80 ℃ for 1h, adjusting the pH value to 8.0, adding calcium sulfate whiskers, stirring for reaction for 7-8h, filtering, washing to be neutral, and drying at low temperature to obtain a product; the weight ratio of sodium tetraborate decahydrate to trioctyl phosphate to zinc nitrate to calcium sulfate whisker is 2: 1: 4: and 8, the diameter of the calcium sulfate whisker is 3-5 μm, and the length of the calcium sulfate whisker is 20-40 μm.
The preparation method of the underground coal mine fire prevention and extinguishing material comprises the following steps:
(1) stirring and mixing sodium alginate, hydroxyethyl carboxymethyl cellulose, fly ash and half of water for 15-20 min;
(2) stirring the foam stabilizer, the foaming agent and one third of water at a high speed for 15-20min, then adding the mixture and the rest raw materials into the mixture obtained in the step (1), and uniformly stirring to obtain the product.
Example 2
The underground coal mine fire preventing and extinguishing material is prepared from the following raw materials in parts by weight: 10.5 parts of sodium alginate, 11.5 parts of hydroxyethyl carboxymethyl cellulose, 3.5 parts of fly ash, 16 parts of a cross-linking agent composite material, 3.5 parts of modified calcium sulfate whisker, 0.6 part of a foam stabilizer, 1.2 parts of a foaming agent and 152 parts of water.
Wherein the foaming agent is prepared by mixing sodium secondary alkyl sulfonate and polyoxyethylene abietate according to the weight ratio of 1: 1.
The cross-linking agent composite material is prepared by the following steps:
(1) uniformly mixing lactic acid and acetic acid, adding metal chloride, and stirring and reacting at 70-80 ℃ for 1h to obtain a mixed solution, wherein the molar ratio of the lactic acid to the acetic acid to the metal chloride is 2:4: 1;
(2) spraying the mixed solution into bentonite, fully stirring, air drying and crushing to obtain a product; the weight ratio of the bentonite to the mixed liquor is 1: 8.5.
The metal chloride is formed by mixing aluminum chloride and zinc chloride according to the weight ratio of 2: 1.
The foam stabilizer is prepared from the following raw materials in parts by weight: 9 parts of silicon carbide, 8 parts of vitrified micro bubbles, 1.2 parts of nonylphenol polyoxyethylene ether, 1.8 parts of polyoxyethylene fatty acid ester and 18 parts of water.
The grain diameter of the silicon carbide is 5-10 μm and 20-30 μm respectively accounting for 50%, and the grain diameter of the vitrified micro bubbles is 0.1-0.2 mm.
The modified calcium sulfate whisker is prepared by the following steps: uniformly mixing sodium tetraborate decahydrate and trioctyl phosphate, dropwise adding a zinc nitrate solution, stirring at 70-80 ℃ for 1h, adjusting the pH value to 8.0, adding calcium sulfate whiskers, stirring for reaction for 7-8h, filtering, washing to be neutral, and drying at low temperature to obtain a product; the weight ratio of the sodium tetraborate decahydrate to the trioctyl phosphate to the zinc nitrate to the calcium sulfate whisker is 2: 1: 4: 8.5.
example 3
The underground coal mine fire preventing and extinguishing material is prepared from the following raw materials in parts by weight: 11 parts of sodium alginate, 11 parts of hydroxyethyl carboxymethyl cellulose, 4 parts of fly ash, 17 parts of a cross-linking agent composite material, 4 parts of modified calcium sulfate whisker, 0.8 part of a foam stabilizer, 1.5 parts of a foaming agent and 155 parts of water.
Wherein the foaming agent is prepared by mixing sodium secondary alkyl sulfonate and polyoxyethylene abietate according to the weight ratio of 1: 1.
The cross-linking agent composite material is prepared by the following steps:
(1) uniformly mixing lactic acid and acetic acid, adding metal chloride, and stirring and reacting at 70-80 ℃ for 1h to obtain a mixed solution, wherein the molar ratio of the lactic acid to the acetic acid to the metal chloride is 2:4: 1;
(2) spraying the mixed solution into bentonite, fully stirring, air drying and crushing to obtain a product; the weight ratio of the bentonite to the mixed solution is 1:9.
The metal chloride is formed by mixing aluminum chloride and zinc chloride according to the weight ratio of 2: 1.
The foam stabilizer is prepared from the following raw materials in parts by weight: 10 parts of silicon carbide, 7 parts of vitrified micro bubbles, 1.5 parts of nonylphenol polyoxyethylene ether, 1.5 parts of polyoxyethylene fatty acid ester and 20 parts of water.
The grain diameter of the silicon carbide is 5-10 μm and 20-30 μm respectively accounting for 50%, and the grain diameter of the vitrified micro bubbles is 0.1-0.2 mm.
The modified calcium sulfate whisker is prepared by the following steps: uniformly mixing sodium tetraborate decahydrate and trioctyl phosphate, dropwise adding a zinc nitrate solution, stirring at 70-80 ℃ for 1h, adjusting the pH value to 8.0, adding calcium sulfate whiskers, stirring for reaction for 7-8h, filtering, washing to be neutral, and drying at low temperature to obtain a product; the weight ratio of the sodium tetraborate decahydrate to the trioctyl phosphate to the zinc nitrate to the calcium sulfate whisker is 2: 1: 4: 9.
example 4
The underground coal mine fire preventing and extinguishing material is prepared from the following raw materials in parts by weight: 11.5 parts of sodium alginate, 10.5 parts of hydroxyethyl carboxymethyl cellulose, 4.5 parts of fly ash, 17.5 parts of a cross-linking agent composite material, 4.5 parts of modified calcium sulfate whisker, 0.9 part of a foam stabilizer, 1.8 parts of a foaming agent and 158 parts of water.
Wherein the foaming agent is prepared by mixing sodium secondary alkyl sulfonate and polyoxyethylene abietate according to the weight ratio of 1: 1.
The cross-linking agent composite material is prepared by the following steps:
(1) uniformly mixing lactic acid and acetic acid, adding metal chloride, and stirring and reacting at 70-80 ℃ for 1h to obtain a mixed solution, wherein the molar ratio of the lactic acid to the acetic acid to the metal chloride is 2:4: 1;
(2) spraying the mixed solution into bentonite, fully stirring, air drying and crushing to obtain a product; the weight ratio of the bentonite to the mixed solution is 1: 9.5.
The metal chloride is formed by mixing aluminum chloride and zinc chloride according to the weight ratio of 2: 1.
The foam stabilizer is prepared from the following raw materials in parts by weight: 11 parts of silicon carbide, 7.5 parts of vitrified micro bubbles, 1.8 parts of nonylphenol polyoxyethylene ether, 1.2 parts of polyoxyethylene fatty acid monoester and 22 parts of water.
The grain diameter of the silicon carbide is 5-10 μm and 20-30 μm respectively accounting for 50%, and the grain diameter of the vitrified micro bubbles is 0.1-0.2 mm.
The modified calcium sulfate whisker is prepared by the following steps: uniformly mixing sodium tetraborate decahydrate and trioctyl phosphate, dropwise adding a zinc nitrate solution, stirring at 70-80 ℃ for 1h, adjusting the pH value to 8.0, adding calcium sulfate whiskers, stirring for reaction for 7-8h, filtering, washing to be neutral, and drying at low temperature to obtain a product; the weight ratio of the sodium tetraborate decahydrate to the trioctyl phosphate to the zinc nitrate to the calcium sulfate whisker is 2: 1: 4: 9.5.
example 5
The underground coal mine fire preventing and extinguishing material is prepared from the following raw materials in parts by weight: 12 parts of sodium alginate, 10 parts of hydroxyethyl carboxymethyl cellulose, 5 parts of fly ash, 18 parts of a cross-linking agent composite material, 5 parts of modified calcium sulfate whisker, 1 part of a foam stabilizer, 2 parts of a foaming agent and 160 parts of water.
Wherein the foaming agent is prepared by mixing sodium secondary alkyl sulfonate and polyoxyethylene abietate according to the weight ratio of 1: 1.
The cross-linking agent composite material is prepared by the following steps:
(1) uniformly mixing lactic acid and acetic acid, adding metal chloride, and stirring and reacting at 70-80 ℃ for 1h to obtain a mixed solution, wherein the molar ratio of the lactic acid to the acetic acid to the metal chloride is 2:4: 1;
(2) spraying the mixed solution into bentonite, fully stirring, air drying and crushing to obtain a product; the weight ratio of the bentonite to the mixed solution is 1: 10.
The metal chloride is formed by mixing aluminum chloride and zinc chloride according to the weight ratio of 2: 1.
The foam stabilizer is prepared from the following raw materials in parts by weight: 12 parts of silicon carbide, 6 parts of vitrified micro bubbles, 2 parts of nonylphenol polyoxyethylene ether, 1 part of fatty acid polyoxyethylene ester and 25 parts of water.
The grain diameter of the silicon carbide is 5-10 μm and 20-30 μm respectively accounting for 50%, and the grain diameter of the vitrified micro bubbles is 0.1-0.2 mm.
The modified calcium sulfate whisker is prepared by the following steps: uniformly mixing sodium tetraborate decahydrate and trioctyl phosphate, dropwise adding a zinc nitrate solution, stirring at 70-80 ℃ for 1h, adjusting the pH value to 8.0, adding calcium sulfate whiskers, stirring for reaction for 7-8h, filtering, washing to be neutral, and drying at low temperature to obtain a product; the weight ratio of the sodium tetraborate decahydrate to the trioctyl phosphate to the zinc nitrate to the calcium sulfate whisker is 2: 1: 4: 10.
performance detection
The inhibition performance, the thermal stability and the compressive strength of the fire prevention and extinguishing material prepared in the embodiment 1-5 of the application are detected; wherein the inhibition performance refers to MT/T700 and 1997 universal technical conditions of the inhibitor for coal mine fire prevention for testing the inhibition rate at the coal temperature of 100 ℃; compression strength test the material was prepared into 70 x 70mm test specimens, cured for 6h and tested for compression strength. The thermal stability of the fire prevention and extinguishing material in example 2 was tested by the following specific method: 100g of gel and the same mass of water are respectively placed in a constant-temperature drying oven to be heated at a constant speed, the heating range is 80-180 ℃, and the weight loss rate is respectively detected.
TABLE 1 Performance test data
TABLE 2 thermal stability testing of fire protection and extinguishing materials
The viscosity of the gel prepared in the embodiments 1-5 is not changed any more in 30min, and the demand of fire prevention and extinguishing under a coal mine can be met. The inhibition performance is 72.5-76.6%, the oxidation process of coal and the release of CO can be effectively inhibited, and the gel water loss rate at different temperatures in the table 2 is combined, so that the gel water loss rate at 180 ℃ is 40.5%, which shows that the fire-extinguishing material prepared by the application has excellent thermal stability, strong water-fixing and water-retaining effects, high gel strength and excellent fire-extinguishing performance.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (3)
1. The underground coal mine fire preventing and extinguishing material is characterized in that: the feed is prepared from the following raw materials in parts by weight: 10-12 parts of sodium alginate, 10-12 parts of hydroxyethyl carboxymethyl cellulose, 3-5 parts of fly ash, 15-18 parts of a cross-linking agent composite material, 3-5 parts of modified calcium sulfate whisker, 0.5-1 part of a foam stabilizer, 1-2 parts of a foaming agent and 160 parts of water 150 and sodium chloride;
the foaming agent is prepared by mixing sodium secondary alkyl sulfonate and polyoxyethylene abietate according to the weight ratio of 1: 1;
the cross-linking agent composite material is prepared by the following steps:
(1) uniformly mixing lactic acid and acetic acid, adding metal chloride, and stirring and reacting at 70-80 ℃ for 1h to obtain a mixed solution, wherein the molar ratio of the lactic acid to the acetic acid to the metal chloride is 2:4: 1;
(2) spraying the mixed solution into bentonite, fully stirring, air drying and crushing to obtain a product; the weight ratio of the bentonite to the mixed solution is 1: 8-10;
the metal chloride is formed by mixing aluminum chloride and zinc chloride according to the weight ratio of 2: 1;
the foam stabilizer is prepared from the following raw materials in parts by weight: 8-12 parts of silicon carbide, 6-9 parts of vitrified micro bubbles, 1-2 parts of nonylphenol polyoxyethylene ether, 1-2 parts of fatty acid polyoxyethylene monoester and 16-25 parts of water;
the modified calcium sulfate whisker is prepared by the following steps: uniformly mixing sodium tetraborate decahydrate and trioctyl phosphate, dropwise adding a zinc nitrate solution, stirring at 70-80 ℃ for 1h, adjusting the pH value to 8.0, adding calcium sulfate whiskers, stirring for reaction for 7-8h, filtering, washing to be neutral, and drying at low temperature to obtain a product; the weight ratio of the sodium tetraborate decahydrate to the trioctyl phosphate to the zinc nitrate to the calcium sulfate whisker is 2: 1: 4: 8-10.
2. The underground coal mine fire prevention and extinguishing material according to claim 1, which is characterized in that: the grain diameter of the silicon carbide is 5-10 mu m and 20-30 mu m respectively account for 50 percent, and the grain diameter of the vitrified micro bubbles is 0.1-0.2 mm.
3. The preparation process of the coal mine underground fire prevention and extinguishing material according to claim 1 is characterized in that: the method comprises the following steps:
(1) stirring and mixing sodium alginate, hydroxyethyl carboxymethyl cellulose, fly ash and half of water for 15-20 min;
(2) stirring the foam stabilizer, the foaming agent and one third of water at a high speed for 15-20min, then adding the mixture and the rest raw materials into the mixture obtained in the step (1), and uniformly stirring to obtain the product.
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| CN114085050B (en) | 2021-11-30 | 2022-07-12 | 中国矿业大学 | Fly ash-based green high-water-retention gel for preventing mine coal spontaneous combustion and preparation method thereof |
| CN115245646B (en) * | 2022-01-04 | 2023-07-04 | 重庆工程职业技术学院 | Coal mine goaf fire prevention and extinguishment composite material and preparation method thereof |
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| CN106902487A (en) * | 2017-01-20 | 2017-06-30 | 山东科技大学 | A kind of colliery preparation method of fire extinguishing colloidal materials |
| CN110642558B (en) * | 2019-10-18 | 2020-07-10 | 新化县天马水泥有限公司 | Fiber-reinforced composite gel cement material and preparation method thereof |
| CN110812771A (en) * | 2019-11-22 | 2020-02-21 | 安徽理工大学 | Foam fire prevention and extinguishing material and preparation method and application thereof |
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Effective date of registration: 20230720 Address after: No. 246, Xinxing Street, Jianshan District, Shuangyashan City, Heilongjiang Province, 155100 Patentee after: Heilongjiang Longmei Shuangyashan Mining Co.,Ltd. Address before: 402260 No. 1 North and South Avenue, Binjiang new town, Jiangjin District, Chongqing. Patentee before: CHONGQING VOCATIONAL INSTITUTE OF ENGINEERING |