Mining air-leakage-stopping flame-retardant anti-static spraying foaming material and preparation method thereof

Abstract

The invention discloses a mining air-leakage-stopping flame-retardant anti-static spraying foaming material and a preparation method thereof, and relates to the technical field of spraying foaming materials, the mining air-leakage-stopping flame-retardant anti-static spraying foaming material comprises a first component and a second component, the first component comprises the following raw materials in parts by weight: polyether polyol, a flame retardant, a catalyst, a foam stabilizer, an antistatic agent, a filler, a plasticizer and a foaming agent; the second component is prepared from the following raw materials in parts by weight: diisocyanate, a plasticizer, a flame retardant and filler. Efficient anti-static is achieved through the modified conductive graphite, and the problem that a traditional antistatic agent is poor in compatibility is solved; the flame retardant property is remarkably improved by adopting an efficient flame retardant composition, and spontaneous combustion in a high-temperature environment is prevented; the combination of polyether polyol and diisocyanate is optimized, so that the compressive property and the mechanical strength are improved; and low-temperature reaction reduces potential safety hazards, construction is convenient, and various conditions are adapted. The material effectively solves the problems of insufficient anti-static, flame-retardant and compression-resistant properties, and provides safe and reliable technical guarantee for underground coal mines.

Description

Technical Field

[0001] The invention relates to the technical field of spray foaming materials, and in particular to a flame retardant and antistatic spray foaming material for plugging air leakage in mines and a preparation method thereof. Background Art

[0002] With the continuous advancement of coal mining technology, the problem of air leakage in coal mine tunnels and goafs has become one of the important factors affecting mine safety production. Air leakage not only increases the risk of coal spontaneous combustion, but also reduces the ventilation efficiency of mines, resulting in energy waste and safety hazards. To solve this problem, relevant technologies have gradually developed, especially plugging technology has been widely used. The core purpose of plugging technology is to prevent air from flowing into the fire zone by sealing tunnels and abandoned passages, thereby reducing oxygen supply, lowering the temperature of the fire zone, and inhibiting coal spontaneous combustion. Early plugging materials were mainly inorganic materials, such as cement and gypsum. These materials have a certain sealing effect, but they are often not stable enough under the action of dynamic pressure, and are prone to damage or failure, resulting in the inability to completely control air leakage. In recent years, with the development of organic chemical materials, foaming plugging materials have gradually entered the application field. The plugging effect of this type of material has been significantly improved, especially in terms of resistance to dynamic pressure, and has become an important choice in the field of modern coal mine fire prevention and extinguishing.

[0003] However, although organic foam materials show excellent performance in plugging applications, there are still some problems to be solved in the prior art. First, although organic foam materials have good filling performance, their high temperature resistance is insufficient and it is difficult to use them safely in high temperature areas under coal mines. In particular, the flammability of the material itself may cause spontaneous combustion or combustion support when encountering high temperatures, further increasing the risk of mine fires. In addition, existing foam plugging materials often do not have anti-static functions. Static electricity is easily generated in mines due to air flow and material friction. If not controlled, static electricity discharge may cause fires or explosions, causing great safety hazards. To solve this problem, the prior art generally adopts the method of adding antistatic agents. However, the amount of antistatic agent added has a significant effect on the overall performance of the material. If the amount added is too high, although the antistatic performance of the material can be enhanced, it will also cause the mechanical properties of the material to decrease, and the flexibility, compressive resistance and other aspects of the material are poor, which cannot meet the long-term use requirements in the harsh environment of the mine. If the amount of antistatic agent added is reduced, the antistatic effect of the material is obviously insufficient, and the accumulation of static electricity cannot be effectively controlled, especially under the humid or complex conditions of the mine, the antistatic performance decreases rapidly. Therefore, how to improve the anti-static effect of the material while ensuring its basic performance has become one of the difficult problems that are difficult to overcome with existing technologies.

[0004] In addition, cost issues also plague the development of existing technologies. The cost of organic foam materials is relatively high, especially in the addition of antistatic agents and flame retardants, which requires balancing the contradiction between material cost and performance. Efficient antistatic and flame retardant technologies are often accompanied by high production costs, which undoubtedly increases the economic burden for large-scale coal mine applications. Therefore, in the existing technology, finding a material that can effectively prevent air leakage, has good flame retardant and antistatic properties, and has controllable costs is still a major challenge facing the coal mining field.

[0005] Based on the above-mentioned deficiencies in the prior art, the underground working environment of coal mines urgently needs a safe plugging material that can be used under high temperature and high pressure conditions. This material must not only have good plugging performance and be able to effectively prevent air from flowing into the fire zone, but also must have excellent anti-static and flame retardant properties to cope with the complex working conditions in the mine. In addition, the cost control of materials is also an urgent problem to be solved. While maintaining high performance, how to reduce the production and application costs of materials is one of the core problems of the current technical problems. Therefore, the development of a multifunctional, low-cost, high-temperature resistant mining plugging material has become an important demand in coal mine safety production. Summary of the invention

[0006] In order to achieve the above-mentioned purpose of the invention and to solve the above-mentioned technical problems, the present invention provides a flame-retardant and anti-static spray foam material for plugging air leakage in mines, comprising a first component and a second component in a mass ratio of 1:1, the first component comprising the following raw materials in parts by weight: 30-50 parts of polyether polyol, 20-30 parts of flame retardant, 0.5-5 parts of catalyst, 0.1-2 parts of foam stabilizer, 1-10 parts of antistatic agent, 5-30 parts of filler, 5-20 parts of plasticizer and 0.1-2 parts of foaming agent; the second component comprising the following raw materials in parts by weight: 30-50 parts of diisocyanate, 5-20 parts of plasticizer, 20-30 parts of flame retardant and 5-30 parts of filler.

[0007] Preferably, the antistatic agent is modified conductive graphite, and its preparation method is as follows: dissolving the conductive graphite in a 30-35% by mass coconut oil ethyl dimethyl ammonium ethyl sulfate aqueous solution, the mass ratio of the conductive graphite to the coconut oil ethyl dimethyl ammonium ethyl sulfate is 1:10, heating to 80°C, stirring for 1h, the rotation speed is 2000-2500r / min, then adding γ-aminopropyl triethoxysilane dropwise, the mass ratio of the conductive graphite to γ-aminopropyl triethoxysilane is 1:20, stirring for 30min, the rotation speed is 4500-5000r / min, washing, filtering, and drying to obtain modified conductive graphite.

[0008] Preferably, it is characterized in that the polyether polyol is one or more of difunctional to pentafunctional polyols with a molecular weight of 500-2000.

[0009] Preferably, the flame retardant is one or more of tris(2-chloroethyl) phosphate, tricresyl phosphate, and trichloroethyl phosphate.

[0010] Preferably, the catalyst is one or more of an organic tin catalyst, an organic bismuth catalyst, and an amine catalyst.

[0011] Preferably, the foam stabilizer is one or more of organosilicon, polyol, silicone, sulfonated fatty alcohol, and sulfonated fatty acid.

[0012] Preferably, the filler is one or more of aluminum hydroxide, magnesium hydroxide, calcium carbonate, calcium sulfate and talc.

[0013] Preferably, the plasticizer is one or more of 42# chlorinated paraffin, 52# chlorinated paraffin, 80# chlorinated paraffin, synthetic plant ester, dioctyl adipate, and tributyl citrate.

[0014] Preferably, the blowing agent is water;

[0015] Preferably, the diisocyanate is one or more of diphenylmethane diisocyanate, toluene diisocyanate, and hexamethylene diisocyanate.

[0016] The present invention also provides a method for preparing the above-mentioned flame-retardant and antistatic spray foam material for plugging air leakage in mines, and the steps are as follows:

[0017] S1 adds polyether polyol, flame retardant, catalyst, foam stabilizer, plasticizer, foaming agent, antistatic agent and filler in sequence and stirs and mixes evenly to obtain the first component.

[0018] S2 adds diisocyanate, plasticizer, flame retardant and filler in sequence and stirs and mixes them evenly to obtain the second component.

[0019] When using S3, use spray equipment to mix component A and component B in a volume ratio of 1:1 and spray to the construction area.

[0020] The technical solution provided by the present invention brings beneficial effects:

[0021] In terms of antistatic performance, by using modified conductive graphite as an antistatic agent, the problem of poor compatibility between traditional antistatic agents and foaming material systems is effectively solved. The modified conductive graphite has good dispersibility in the material and can maintain a high antistatic effect at a low addition amount, thereby effectively preventing the fire and explosion hazards caused by static electricity accumulation in mines. At the same time, the antistatic agent can still maintain stable antistatic performance in harsh environments such as humidity and high temperature, solving the problem in the prior art that the antistatic effect drops sharply with environmental changes.

[0022] The technical effect of the present invention in terms of flame retardant performance is particularly significant. A combination of high-efficiency flame retardants is used in the material. The introduction of these flame retardants into the material system not only greatly improves the high temperature resistance of the material, enabling it to be used for a long time in the high temperature environment of coal mines, but also effectively avoids the spontaneous combustion or combustion-supporting phenomenon that may occur in traditional foaming materials at high temperatures. This flame retardant improvement not only improves the safety of the material, but also provides technical support for the safety protection of coal mine fire areas, overcoming the safety risks brought by the flammability of traditional organic foaming materials.

[0023] The present invention has also achieved significant improvements in compression resistance and mechanical strength by optimizing the combination of polyether polyol and diisocyanate. Compared with traditional inorganic curing materials, this material has better compression resistance and elasticity under dynamic pressure environment, can adapt to the complex pressure changes in mines, and ensure the long-term stability of the plugging effect. This feature effectively overcomes the problem that existing plugging materials are prone to failure in mines, and ensures that the material will not lose its sealing performance due to external force damage during long-term use.

[0024] The reaction temperature of the material of the present invention is relatively low, and the maximum reaction temperature during spray curing is lower than 100°C, which greatly reduces the potential safety threats to the environment and construction personnel during the high-temperature reaction process, and improves the safety and convenience of use. The low-temperature reaction characteristics of the material make it suitable for a variety of construction conditions, further expanding its application range.

[0025] The mine-used air leakage plugging flame-retardant and anti-static spray foam material of the present invention not only effectively solves the problems of insufficient anti-static, flame-retardant and compression resistance in the prior art, but also has the advantages of low-temperature reaction and easy construction, providing reliable technical guarantee for underground coal mine safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a photo of the spraying condition of Example 2 of the present invention.

[0027] Figure 2 The first component of Comparative Example 1 (left) and Example 2 (right) of the present invention is left to stand for 7 days. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0029] Example 1

[0030] A flame retardant and antistatic spray foam material for plugging air leakage in mines, comprising a first component and a second component in a mass ratio of 1:1, wherein the first component comprises the following raw materials in parts by weight: 30 parts of a trifunctional polyether polyol with a molecular weight of 500, 10 parts of a difunctional polyether polyol with a molecular weight of 1000, 10 parts of tri(2-chloroethyl) phosphate, 10 parts of tricresyl phosphate, 0.5 parts of dibutyltin dilaurate, 2 parts of triethylenediamine, and 1 part of dimethyl silicone oil , 10 parts of modified conductive graphite, 10 parts of aluminum hydroxide, 10 parts of calcium carbonate, 5 parts of 42# chlorinated paraffin, 5.5 parts of synthetic plant ester, and 1 part of foaming agent water; the second component includes the following raw materials in parts by weight: 30 parts of diphenylmethane diisocyanate, 20 parts of toluene diisocyanate, 5 parts of 52# chlorinated paraffin, 10 parts of synthetic plant ester, 10 parts of tri(2-chloroethyl) phosphate, 10 parts of trichloroethyl phosphate, 10 parts of aluminum hydroxide, and 5 parts of magnesium hydroxide.

[0031] The modified conductive graphite is prepared as follows: the conductive graphite is dissolved in a 30% by mass coconut oil ethyl dimethyl ammonium ethyl sulfate aqueous solution, the mass ratio of the conductive graphite to the coconut oil ethyl dimethyl ammonium ethyl sulfate is 1:10, the temperature is raised to 80°C, stirred for 1 hour, the rotation speed is 2000r / min, and then γ-aminopropyl triethoxysilane is added dropwise, the mass ratio of the conductive graphite to γ-aminopropyl triethoxysilane is 1:20, and then stirred for 30 minutes at a rotation speed of 4500r / min, washed, filtered, and dried to obtain the modified conductive graphite.

[0032] The preparation method of the above-mentioned flame-retardant and anti-static spray foam material for plugging air leakage in mines comprises the following steps:

[0033] S1 adds polyether polyol, flame retardant, catalyst, foam stabilizer, plasticizer, foaming agent, antistatic agent and filler in sequence and stirs and mixes evenly to obtain the first component.

[0034] S2 adds diisocyanate, plasticizer, flame retardant and filler in sequence and stirs and mixes them evenly to obtain the second component.

[0035] When using S3, use spray equipment to mix component A and component B in a volume ratio of 1:1 and spray to the construction area.

[0036] Example 2

[0037] A flame retardant and antistatic spray foam material for plugging leaks in mines, comprising a first component and a second component in a mass ratio of 1:1, wherein the first component comprises the following raw materials in parts by weight: 40 parts of a trifunctional polyether polyol with a molecular weight of 500, 5 parts of a difunctional polyether polyol with a molecular weight of 1000, 15 parts of tri(2-chloroethyl) phosphate, 5 parts of tricresyl phosphate, 0.5 parts of bismuth isooctanoate, 2 parts of tetramethylbutylene diamine, and sulfonyl lauryl alcohol polyoxyethylene ether. 1 part of disodium succinate, 1 part of modified conductive graphite, 19 parts of aluminum hydroxide, 5 parts of calcium carbonate, 5 parts of 42# chlorinated paraffin, and 0.5 parts of foaming agent water; the second component includes the following raw materials in parts by weight: 40 parts of diphenylmethane diisocyanate, 10 parts of toluene diisocyanate, 15 parts of 42# chlorinated paraffin, 5 parts of synthetic plant ester, 5 parts of tri(2-chloroethyl) phosphate, 10 parts of trichloroethyl phosphate, 10 parts of magnesium hydroxide, and 5 parts of talc.

[0038] The modified conductive graphite is prepared as follows: the conductive graphite is dissolved in a 35% by mass coconut ethyl dimethyl ammonium ethyl sulfate aqueous solution, the mass ratio of the conductive graphite to the coconut ethyl dimethyl ammonium ethyl sulfate is 1:10, the temperature is raised to 80°C, stirred for 1 hour, the rotation speed is 2000r / min, and then γ-aminopropyl triethoxysilane is added dropwise, the mass ratio of the conductive graphite to γ-aminopropyl triethoxysilane is 1:20, and then stirred for 30 minutes at a rotation speed of 4500r / min, washed, filtered, and dried to obtain the modified conductive graphite.

[0039] The preparation method of the above-mentioned flame-retardant and anti-static spray foam material for plugging air leakage in mines comprises the following steps:

[0040] S1 adds polyether polyol, flame retardant, catalyst, foam stabilizer, plasticizer, foaming agent, antistatic agent and filler in sequence and stirs and mixes evenly to obtain the first component.

[0041] S2 adds diisocyanate, plasticizer, flame retardant and filler in sequence and stirs and mixes them evenly to obtain the second component.

[0042] When using S3, use spray equipment to mix component A and component B in a volume ratio of 1:1 and spray to the construction area.

[0043] Example 3

[0044] A flame-retardant and antistatic spray foaming material for plugging air leakage in mines comprises a first component and a second component in a mass ratio of 1:1, wherein the first component comprises the following raw materials in parts by weight: 35 parts of a trifunctional polyether polyol with a molecular weight of 500, 5 parts of a difunctional polyether polyol with a molecular weight of 1000, 5 parts of tris(2-chloroethyl) phosphate, 10 parts of trichloroethyl phosphate, 0.5 parts of stannous octoate, 3.5 parts of pentamethyldipropylenetriamine, 1 part of methylphenyl silicone oil, 5 parts of modified conductive graphite, 30 parts of aluminum hydroxide, 5 parts of 42# chlorinated paraffin, and 1 part of foaming agent water; and the second component comprises the following raw materials in parts by weight: 40 parts of diphenylmethane diisocyanate, 15 parts of 42# chlorinated paraffin, 10 parts of tris(2-chloroethyl) phosphate, 10 parts of trichloroethyl phosphate, 15 parts of aluminum hydroxide, and 10 parts of magnesium hydroxide.

[0045] The modified conductive graphite is prepared as follows: the conductive graphite is dissolved in a 30% by mass aqueous solution of coconut ethyl dimethyl ammonium ethyl sulfate, the mass ratio of the conductive graphite to coconut ethyl dimethyl ammonium ethyl sulfate is 1:10, the temperature is raised to 80°C, stirred for 1 hour, the rotation speed is 2500r / min, and then γ-aminopropyl triethoxysilane is added dropwise, the mass ratio of the conductive graphite to γ-aminopropyl triethoxysilane is 1:20, and then stirred for 30 minutes at a rotation speed of 5000r / min, washed, filtered, and dried to obtain the modified conductive graphite.

[0046] The preparation method of the above-mentioned flame-retardant and anti-static spray foam material for plugging air leakage in mines comprises the following steps:

[0047] S1 adds polyether polyol, flame retardant, catalyst, foam stabilizer, plasticizer, foaming agent, antistatic agent and filler in sequence and stirs and mixes evenly to obtain the first component.

[0048] S2 adds diisocyanate, plasticizer, flame retardant and filler in sequence and stirs and mixes them evenly to obtain the second component.

[0049] When using S3, use spray equipment to mix component A and component B in a volume ratio of 1:1 and spray to the construction area.

[0050] Example 4

[0051] The same preparation method as in Example 2 was used for preparation, except that 5 parts of modified conductive graphite antistatic agent were added.

[0052] Example 5

[0053] The same preparation method as in Example 2 was used for preparation, except that 10 parts of modified conductive graphite antistatic agent were added.

[0054] Example 6

[0055] The method was the same as that in Example 5, except that the mass ratio of the conductive graphite to the coconut ethyl dimethyl ammonium ethyl sulfate was 1:5.

[0056] Example 7

[0057] The method was the same as that in Example 5, except that the mass ratio of the conductive graphite to the coconut ethyl dimethyl ammonium ethyl sulfate was 1:2.

[0058] Example 8

[0059] The same preparation method as in Example 5 was used, except that the mass ratio of conductive graphite to γ-aminopropyltriethoxysilane was 1:10.

[0060] Example 9

[0061] The preparation was carried out in the same manner as in Example 5, except that the mass ratio of the conductive graphite to γ-aminopropyltriethoxysilane was 1:5.

[0062] Comparative Example 1

[0063] The spray foam material includes a first component and a second component in a mass ratio of 1:1. The first component includes the following raw materials in parts by weight: 40 parts of a trifunctional polyether polyol with a molecular weight of 500, 25 parts of tris(2-chloroethyl) phosphate, 4 parts of tetramethylbutylene diamine, 0.5 parts of disodium lauryl polyoxyethylene ether sulfosuccinate, 15.5 parts of synthetic plant esters, 1 part of foaming agent water, 10 parts of conductive graphite, and 10 parts of talc; the second component includes the following raw materials in parts by weight: 50 parts of diphenylmethane diisocyanate, 15 parts of 52# chlorinated paraffin, 25 parts of synthetic plant esters, 10 parts of tris(2-chloroethyl) phosphate, and 10 parts of talc. The preparation method of the above-mentioned flame-retardant and antistatic spray foam material for mine plugging wind, the steps are as follows:

[0064] S1 adds polyether polyol, flame retardant, catalyst, foam stabilizer, plasticizer, foaming agent, antistatic agent and filler in sequence and stirs and mixes evenly to obtain the first component.

[0065] S2 adds diisocyanate, plasticizer, flame retardant and filler in sequence and stirs and mixes them evenly to obtain the second component.

[0066] When using S3, use spray equipment to mix component A and component B in a volume ratio of 1:1 and spray to the construction area.

[0067] Comparative Example 2 Commercially available polyurethane spray foam material

[0068] Comparative Example 3

[0069] The same preparation method as in Example 5 was used, except that ordinary conductive graphite was used.

[0070] Comparative Example 4

[0071] The same preparation method as in Example 5 was used, except that sodium dodecylbenzenesulfonate was used instead of cocoyl ethyldimethylammonium ethyl sulfate.

[0072] Comparative Example 5

[0073] The same preparation method as Example 5 was used, except that cocoyl methacrylamide was used instead of cocoyl ethyl dimethyl ammonium ethosulfate.

[0074] Comparative Example 6

[0075] The same preparation method as Example 5 was used, except that phenyltrimethylammonium bromide was used instead of cocoylethyldimethylammonium ethosulfate.

[0076] Comparative Example 7

[0077] The same preparation method as in Example 5 was used, except that methyltriethoxysilane was used instead of γ-aminopropyltriethoxysilane.

[0078] Comparative Example 8

[0079] The same preparation method as in Example 5 was used, except that ethyl orthosilicate was used instead of γ-aminopropyltriethoxysilane.

[0080] Experimental test:

[0081] 1. The oxygen index test shall be carried out in accordance with Chapter 10 of GB / T 2406.2-2009.

[0082] 2. Surface resistance test method: According to the volume ratio of 1:1, measure 150mL of component A and 150mL of component B, totaling 300mL. In the mixing glue gun, use air pressure to mix components A and B evenly, and inject them into a closed mold with a height of 10mm and a length × width of 300mm × 300mm. After molding, let it stand at room temperature for 30 minutes, take out the prepared sample, and measure the surface resistance of the sample according to the surface resistance method in Chapter 5 of MT / T 113-1995.

[0083] 3. The air permeability test shall be carried out according to the experimental method specified in GB / T 10655-2003.

[0084] 4. Maximum reaction temperature test method: Mix components A and B according to the specified ratio and grouting rate, use the matching grouting device, and inject them into a test box with an internal size of 1000mm×1000mm×1200mm, with a total weight of 40kg. Record the flow rate and spraying time. The test box is placed on a bracket. The test box is made of 5mm thick solid wood veneer, and the whole is reinforced with wooden strips of the same material for stability, with a sealed cover. The inside of the test box is fully covered with 0.2mm thick PET film, and the overlap width of the PET film is not less than 50mm. The overlap is pre-sprayed with 0.2mm thick PET film. The slurry material is well sealed; a gas collection hole and a grouting hole are respectively opened at the top center position and the top corner position of the closed test box, and the slurry is vertically injected along the grouting hole position; 3 K-type thermocouples (with an accuracy of 2%) are arranged at the centroid (the centroid position is calculated based on parameters such as the density of the grouting material, the grouting amount, the foaming multiple, and the bottom area of ​​the test box), and are well fixed; when the grouting starts, the thermocouple and the temperature acquisition instrument are connected, and the temperature data is collected every 10 seconds, and the temperature change over time during the reaction process is recorded, and the temperature data is continuously collected for not less than 72 hours.

[0085] 5. The tensile strength test is carried out according to the test method in GB / T 9641-1988, and the sample tensile speed is 5mm / min. The tensile strength calculation result is accurate to 0.1kPa.

[0086] Table 1 Specific performance indicators of embodiments and comparative examples

[0087]

[0088] Test results show that the mine-use wind-proof flame-retardant antistatic spray foam material of the present invention is significantly superior to the comparative sample in terms of antistatic performance, flame-retardant performance, air permeability, compressive strength and the like.

[0089] 1. Antistatic performance: The modified conductive graphite is used as an antistatic agent in the embodiment, and the surface resistance is 1.1×10 7 Ω to

[0090] 1.6×10 8 Ω, which is much better than the 10 9 The level above Ω shows excellent antistatic effect.

[0091] 2. Flame retardant performance: The oxygen index of the embodiment is as high as 34, and the flame retardant performance is significantly better than the level of 27-28 of the comparative example.

[0092] 3. Air permeability: The air permeability of the embodiments is relatively low, which effectively avoids air infiltration and maintains a good blocking effect, especially in Example 5, which reaches 8.3×10 -10 m 2 .

[0093] 4. Mechanical strength: The tensile strength of the embodiments is generally higher than that of the comparative examples, and the highest tensile strength of embodiment 5 reaches 405 kPa, far exceeding the highest tensile strength of the comparative example of 213 kPa.

[0094] In summary, the material of the embodiment shows significant advantages in antistatic, flame retardancy, air tightness and mechanical properties, and is suitable for the harsh environmental conditions in mines.

[0095] Figure 2 This indicates that after the conductive graphite is modified, the system stability is better and the liquid material does not stratify.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A flame retardant and antistatic spray foam material for plugging leakage in mines, characterized in that: The invention comprises a first component and a second component in a mass ratio of 1:

1. The first component comprises the following raw materials in parts by weight: 30-50 parts of polyether polyol, 20-30 parts of flame retardant, 0.5-5 parts of catalyst, 0.1-2 parts of foam stabilizer, 1-10 parts of antistatic agent, 5-30 parts of filler, 5-20 parts of plasticizer and 0.1-2 parts of foaming agent; the second component comprises the following raw materials in parts by weight: 30-50 parts of diisocyanate, 5-20 parts of plasticizer, 20-30 parts of flame retardant and 5-30 parts of filler.

2. The spray foam material according to claim 1, characterized in that: The antistatic agent is modified conductive graphite, and the preparation method thereof is as follows: dissolving the conductive graphite in a coconut oil ethyl dimethyl ammonium ethyl sulfate aqueous solution with a mass fraction of 30-35%, the mass ratio of the conductive graphite to the coconut oil ethyl dimethyl ammonium ethyl sulfate being 1:10, heating to 80°C, stirring for 1 hour, the rotation speed being 2000-2500 r / min, then adding γ-aminopropyl triethoxysilane dropwise, the mass ratio of the conductive graphite to the γ-aminopropyl triethoxysilane being 1:20, stirring for another 30 minutes, the rotation speed being 4500-5000 r / min, washing, filtering, and drying to obtain the modified conductive graphite.

3. The spray foam material according to claim 1, characterized in that: The polyether polyol has a molecular weight One or more of difunctional to pentafunctional with a functionality of 500-2000.

4. The spray foam material according to claim 1, characterized in that: The flame retardant is one or more of tris(2-chloroethyl) phosphate, tricresyl phosphate and trichloroethyl phosphate.

5. The spray foam material according to claim 1, characterized in that: The catalyst is one or more of an organic tin catalyst, an organic bismuth catalyst, and an amine catalyst.

6. The spray foam material according to claim 1, characterized in that: The foam stabilizer is one or more of organic silicon, polyols, silicones, sulfonated fatty alcohols, and sulfonated fatty acids.

7. The spray foam material according to claim 1, characterized in that: The filler is one or more of aluminum hydroxide, magnesium hydroxide, calcium carbonate, calcium sulfate and talcum powder.

8. The spray foam material according to claim 1, characterized in that: The plasticizer is 42 # Chlorinated paraffin, 52 # Chlorinated paraffin, 80 # One or more of chlorinated paraffin, synthetic plant ester, dioctyl adipate, tributyl citrate; the foaming agent is water.

9. The spray foam material according to claim 1, characterized in that: The diisocyanate is one or more of diphenylmethane diisocyanate, toluene diisocyanate and hexamethylene diisocyanate.

10. A method for preparing the flame-retardant and antistatic spray foam material for plugging air leakage in mines according to claims 1-9, comprising the following steps: S1 adds polyether polyol, flame retardant, catalyst, foam stabilizer, plasticizer, foaming agent, antistatic agent and filler in sequence and stirs and mixes evenly to obtain the first component. S2 adds diisocyanate, plasticizer, flame retardant and filler in sequence and stirs and mixes them evenly to obtain the second component. When using S3, use spray equipment to mix component A and component B in a volume ratio of 1:1 and spray to the construction area.

Images