Anti-freezing type coal mine dust suppression material based on dual esterification modification and preparation method of anti-freezing type coal mine dust suppression material

Abstract

The invention discloses an anti-freezing coal mine dust suppression material based on double esterification modification and a preparation method thereof. The dust suppression material is prepared from the following raw materials in percentage by weight: 2.5 to 4 parts of locust bean gum, 1.5 to 2 parts of esterification reagent, 1.5 to 3 parts of flammulina velutipes polysaccharide, 2 to 6 parts of wetting agent, 2 to 4 parts of water-retaining agent and the balance of solvent. The preparation method comprises the following steps: dissolving locust bean gum, carrying out primary esterification reaction with citric acid, carrying out secondary esterification reaction with a flammulina velutipes polysaccharide solution, and finally adding a wetting agent and a water-retaining agent, stirring and dissolving. Through citric acid mediated double esterification reaction, locust bean gum and flammulina velutipes polysaccharide form a space cross-linked network, the anti-freezing performance and dust suppression performance of the material are synergistically improved, the problems that a conventional dust suppression material is prone to freezing failure and poor in dust suppression effect in a low-temperature environment are solved, and the dust suppression material is suitable for dust suppression operation in the low-temperature environment such as a coal mine and the like and has wide application prospects. Good application prospects are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of comprehensive dust prevention, and in particular to an anti-freezing coal mine dust suppression material based on double esterification modification and a preparation method thereof. BACKGROUND

[0002] Coal mine dust, as an inevitable byproduct in the mining process, has seriously threatened the safety and health of miners. Inhalable dust has strong diffusivity and persistent suspension, which not only can seriously damage the respiratory system, but also can cause irreversible occupational diseases-pneumoconiosis, and even cause explosions under certain concentration conditions, resulting in major hazards. The existing conventional dust suppression methods cannot effectively capture ultrafine particles, especially in low temperature environments, the dust suppression material is prone to cracking or freezing, resulting in failure of the dust suppression film and aggravating the environmental burden. Therefore, it is urgent to develop a new material that can adapt to the low temperature environment of coal mines and has friendly and high-efficiency dust suppression capacity.

[0003] Currently, dust suppression materials prepared from natural polysaccharides have been widely concerned due to their strong degradability and high safety, but there are obvious shortcomings in practical application. For example, locust bean gum, as a common natural polysaccharide, will form a rigid gel due to excessive aggregation of molecular chains in a low temperature environment, resulting in complete loss of sprayability of the material and failure to meet the needs of coal mine site operations. The single-component natural polysaccharide material cannot break through the technical bottleneck of poor low-temperature fluidity, and the present application innovatively constructs carboxylated active sites on the locust bean gum molecular chain through a citric acid-mediated double esterification reaction, and then forms a spatial cross-linking network with enoki mushroom polysaccharide, realizing the synergistic improvement of anti-freezing performance and dust suppression performance, and effectively solving the above problems. SUMMARY

[0004] To solve the technical problems of poor anti-freezing property and dust suppression effect of dust suppression materials, the present application discloses an anti-freezing coal mine dust suppression material based on double esterification modification and a preparation method thereof.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an anti-freezing coal mine dust suppression material based on double esterification modification, the preparation raw materials of which include, by weight percentage:

[0006] locust bean gum 2.5-4 parts, esterification reagent 1.5-2 parts, enoki mushroom polysaccharide 1.5-3 parts, wetting agent 2-6 parts, water-retaining agent 2-4 parts, and the rest is solvent.

[0007] Preferably, the esterification reagent is citric acid.

[0008] Preferably, the wetting agent is a non-ionic surfactant, and the water-retaining agent is a polyhydric alcohol compound.

[0009] Preferably, the non-ionic surfactant is triton X-100, and the polyhydric alcohol compound is glycerol.

[0010] Preferably, the solvent is distilled water.

[0011] Preferably, under the condition of 200 mL of distilled water, the weight of each raw material is as follows: 0.3 g of locust bean gum, 0.3 g of citric acid, 0.5 g of enoki mushroom polysaccharide, 0.8 g of triton X-100, and 0.6 g of glycerol.

[0012] The application also provides a method for preparing the anti-freezing coal dust suppression material based on double esterification modification as mentioned above, comprising the following steps:

[0013] S1, dispersing locust bean gum in distilled water, stirring and dissolving under the condition of 40-60 DEG C to obtain a locust bean gum solution;

[0014] S2, adding citric acid to the solution obtained in S1, adjusting the pH to 2-4, stirring and reacting under the condition of 70-90 DEG C for 6 hours to obtain a modified product I;

[0015] S3, dispersing enoki mushroom polysaccharide in distilled water, stirring and dissolving under the condition of 30-50 DEG C to obtain an enoki mushroom polysaccharide solution;

[0016] S4, mixing the solution obtained in S3 with the modified product I obtained in S2, stirring and reacting under the condition of 70-90 DEG C for 6 hours to obtain a modified product II;

[0017] S5, adding glycerol and triton X-100 to the modified product II obtained in S4, stirring and dissolving at room temperature to obtain the anti-freezing coal dust suppression material based on double esterification modification.

[0018] Preferably, in S1 and S3, the stirring speed is 300 r / min, and the stirring time is 2 hours.

[0019] Preferably, in S2 and S4, dilute hydrochloric acid is used to adjust the pH value.

[0020] In the preparation of the anti-freezing coal dust suppression material based on double esterification modification, the raw materials have the following characteristics:

[0021] Locust bean gum is derived from locust bean endosperm and is a natural and renewable green environmental protection material. Its unique polysaccharide structure (galactose-mannose block structure) can drive molecular entanglement and hydration, has high adhesion, and can realize efficient dust suppression through adhesion, so that locust bean gum is a natural, renewable and biodegradable dust suppression material resource.

[0022] Citric acid is a full-biological material and has no ecological toxicity, which perfectly matches the requirements of green mines. Since citric acid contains three carboxyl groups, it lays a foundation for two esterification reactions with hydroxyl groups.

[0023] Flammulina velutipes polysaccharide is a kind of bioactive substance extracted from Flammulina velutipes, with its unique β-1,3 / 1,6-glucan rigid backbone and high-density hydrophilic group, its unique triple helix conformation can ensure that the molecular chain still maintains the flexibility in low temperature environment, and the sprayability and film continuity of the material in the extremely cold conditions of the coal mine (such as-20 DEG C) are ensured, which is a potential coal dust suppressant raw material.

[0024] The hydrophilic polyethylene glycol chain and the hydrophobic benzene ring in the molecule of Triton X-100 can synergize, have excellent wetting performance, realize efficient penetration and spreading of high hydrophobic coal dust, and effectively improve the surface tension of the dust suppression material.

[0025] Glycerol is a colorless, odorless, sweet viscous liquid, each glycerol molecule can form a multiple hydrogen bond network with water molecules through three hydroxyl groups, realize efficient water retention performance, and has biodegradable characteristics, which can ensure the ecological safety of the mining area.

[0026] The reaction equation of the application is as follows:

[0027]

[0028] Reaction principle:

[0029] Under the catalysis of acid, the hydroxyl group (-OH) in the locust bean gum with high adhesion and the (-COOH) in citric acid are subjected to esterification reaction, the carboxyl group (-COOH) is introduced into the locust bean gum, the modified product I is obtained, the hydrogen bond network is enhanced, the water activity is reduced, and the remaining carboxyl groups in citric acid are activated at the same time, so as to prepare for the next step of introducing substances;

[0030] Flammulina velutipes polysaccharide is rich in hydroxyl groups, which can further carry out esterification reaction with the carboxyl groups in the modified product I, the (-OH) in the Flammulina velutipes polysaccharide and the carboxyl group (-COOH) in the modified product I are subjected to dehydration reaction, one hydroxyl group of the Flammulina velutipes polysaccharide accepts the carboxyl group of citric acid in the form of water molecule, and an ester bond (-COO-) is formed at the same time, and the Flammulina velutipes polysaccharide contains a rigid segment, which can inhibit the growth of ice crystals, and further improve the anti-freezing performance of the finally prepared dust suppression material.

[0031] Compared with the prior art, the application provides an anti-freezing type coal mine dust suppression material based on double esterification modification and a preparation method thereof, and has the following beneficial effects:

[0032] (1) The application selects natural high molecular locust bean gum as the base material, which has excellent high adhesion, is conducive to capturing and fixing coal dust particles, and the molecular structure rich in hydroxyl groups is easy to be affected by freezing at low temperature. By esterification reaction of hydroxyl group (-OH) of locust bean gum and carboxyl group (-COOH) of citric acid, carboxyl group (-COOH) is successfully introduced into the main chain of locust bean gum to obtain modified product I. The modification not only enhances the hydrogen bond network structure between molecules, significantly reduces the activity of water molecules in the system, effectively inhibits the early formation of ice crystals, and at the same time, the activated remaining carboxyl groups on citric acid provide sufficient active sites for the next step reaction, laying a foundation for building more complex anti-freezing structure.

[0033] (2) The application innovatively introduces flammulina velutipes polysaccharide as the second heavy modification component. The molecular structure of flammulina velutipes polysaccharide contains hydroxyl group (-OH), which can further undergo esterification reaction with the carboxyl group (-COOH) introduced on the modified product I, and through dehydration, a stable ester bond (-COO-) is formed to realize the chemical bonding of two polysaccharide molecules. The key of this step lies in the unique rigid segment structure of flammulina velutipes polysaccharide. These rigid segments play the role of physical barrier and lattice interference in the material matrix, which can effectively inhibit the growth, aggregation and recrystallization process of ice crystals. Through this esterification crosslinking, the rigid segments of flammulina velutipes polysaccharide are integrated into the material network, which cooperates with the modified locust bean gum to significantly improve the low temperature resistance and anti-freezing and thawing cycle ability of the final dust suppression material.

[0034] (3) The anti-freezing type coal mine dust suppression material based on double esterification modification prepared by the application has a significantly optimized comprehensive performance. The basic adhesion provided by locust bean gum is combined with the tight network structure constructed by double esterification, which endows the material with excellent adhesion and film forming property, can form a firm and continuous covering film on the surface of coal dust, effectively fix coal dust particles, prevent their escape and secondary flying, and also has excellent anti-freezing performance, so that the dust suppression material can still maintain its dust suppression function in severe cold environment and is not easy to freeze and fail or structure to disintegrate, especially suitable for year-round dust suppression operation in coal mines in high-cold areas, solving the key problem of sharp performance decline of conventional water-based dust suppressant under low temperature conditions. BRIEF DESCRIPTION OF DRAWINGS

[0035] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, illustrate the application together with the embodiments thereof, and are used to explain the application, and do not constitute a limitation on the application. In the drawings:

[0036] Figure 1 is a process flow diagram of the application;

[0037] Figure 2 is a material dust suppression effect test diagram prepared by each embodiment of the application. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0039] Embodiment 1

[0040] (1) Take 0.3 g locust bean gum in a beaker, add 200 mL distilled water, heat the water bath to 50 ℃, and stir at a speed of 300 r / min for 2 hours to dissolve, to obtain a locust bean gum aqueous solution;

[0041] (2) Add 0.3 g of citric acid to the locust bean gum aqueous solution, adjust the pH of the solution to about 2-4 with dilute hydrochloric acid, and stir at the same speed under magnetic stirring at 70 ℃ for 6 hours to obtain modified product I;

[0042] (3) Take 0.5 g of shiitake mushroom polysaccharide in a beaker, add a certain amount of distilled water, and stir at the same speed under magnetic stirring at a water bath temperature of 40 ℃ for 2 hours to dissolve, to obtain a shiitake mushroom polysaccharide aqueous solution;

[0043] (4) Add the shiitake mushroom polysaccharide aqueous solution to the modified product I, maintain the temperature of the water bath pot at 70 ℃, and stir at the same speed under water bath stirring for 6 hours to obtain modified product II;

[0044] (5) Add 0.8 g of glycerol and 0.6 g of triton X-100 to the modified product II, and stir at the same speed at room temperature until dissolved, to finally obtain a freeze-resistant coal dust suppression material based on double esterification modification.

[0045] Embodiment 2

[0046] (1) Take 0.3 g locust bean gum in a beaker, add 200 mL distilled water, heat the water bath to 50 ℃, and stir at a speed of 300 r / min for 2 hours to dissolve, to obtain a locust bean gum aqueous solution;

[0047] (2) Add 0.4 g of citric acid to the locust bean gum aqueous solution, adjust the pH of the solution to about 2-4 with dilute hydrochloric acid, and stir at the same speed under magnetic stirring at 75 ℃ for 6 hours to obtain modified product I;

[0048] (3) Take 0.6g of mushroom polysaccharide in a beaker, add a certain amount of distilled water, water bath temperature 40℃, the same speed magnetic stirring 2 hours to dissolve, get mushroom polysaccharide aqueous solution;

[0049] (4) The aqueous solution of mushroom polysaccharide is added to the modified product I, the temperature of the water bath is maintained at 75℃, and the same speed water bath stirring reaction is carried out for 6h, to obtain modified product II;

[0050] (5) 0.8g of glycerol and 0.6g of triton X-100 are added to the modified product II, and the same speed stirring is carried out at room temperature until dissolution, to finally obtain the antifreeze type coal dust suppression material based on double esterification modification.

[0051] Example 3

[0052] (1) Take 0.3g of locust bean gum in a beaker, add 200mL of distilled water, heat the water bath to 50℃, and stir at 300r / min for 2 hours to dissolve, to obtain locust bean gum aqueous solution;

[0053] (2) 0.5g of citric acid is added to the locust bean gum aqueous solution, and the solution PH value is adjusted to about 2-4 with dilute hydrochloric acid, and the same speed magnetic stirring reaction is carried out at 80℃ for 6 hours, to obtain modified product I;

[0054] (3) Take 0.7g of mushroom polysaccharide in a beaker, add a certain amount of distilled water, water bath temperature 40℃, the same speed magnetic stirring 2 hours to dissolve, get mushroom polysaccharide aqueous solution;

[0055] (4) The aqueous solution of mushroom polysaccharide is added to the modified product I, the temperature of the water bath is maintained at 80℃, and the same speed water bath stirring reaction is carried out for 6h, to obtain modified product II;

[0056] (5) 0.8g of glycerol and 0.6g of triton X-100 are added to the modified product II, and the same speed stirring is carried out at room temperature until dissolution, to finally obtain the antifreeze type coal dust suppression material based on double esterification modification.

[0057] Example 4

[0058] (1) Take 0.4g of locust bean gum in a beaker, add 200mL of distilled water, heat the water bath to 50℃, and stir at 300r / min for 2 hours to dissolve, to obtain locust bean gum aqueous solution;

[0059] (2) 0.3g of citric acid is added to the locust bean gum aqueous solution, and the solution PH value is adjusted to about 2-4 with dilute hydrochloric acid, and the same speed magnetic stirring reaction is carried out at 80℃ for 6 hours, to obtain modified product I;

[0060] (3) Take 0.6 g of Flammulina velutipes polysaccharide in a beaker, add a certain amount of distilled water, set the water bath temperature at 40°C, and stir magnetically at the same speed for 2 hours until dissolved to obtain a Flammulina velutipes polysaccharide aqueous solution;

[0061] (4) Add the aqueous solution of Flammulina velutipes polysaccharide to the modified product I, maintain the water bath temperature at 80°C, and stir the water bath at the same speed for 6 hours to obtain the modified product II;

[0062] (5) Add 0.8 g of glycerol and 0.6 g of Triton X-100 to the modified product II, stir at the same speed at room temperature until dissolved, and finally obtain an antifreeze type coal mine dust suppression material based on double esterification modification.

[0063] Example 5

[0064] (1) Take 0.4 g of locust bean gum in a beaker, add 200 mL of distilled water, heat to 50°C in a water bath, and stir at a constant temperature at 300 r / min for 2 hours until dissolved to obtain a locust bean gum aqueous solution;

[0065] (2) Add 0.4 g of citric acid to the locust bean gum aqueous solution, adjust the pH of the solution to about 2-4 with dilute hydrochloric acid, and react at 70° C. with magnetic stirring at the same speed for 6 hours to obtain modified product I;

[0066] (3) Take 0.7 g of Flammulina velutipes polysaccharide in a beaker, add a certain amount of distilled water, set the water bath temperature at 40°C, and stir magnetically at the same speed for 2 hours until dissolved to obtain a Flammulina velutipes polysaccharide aqueous solution;

[0067] (4) Add the aqueous solution of Flammulina velutipes polysaccharide to the modified product I, maintain the water bath temperature at 70°C, and stir the water bath at the same speed for 6 hours to obtain the modified product II;

[0068] (5) Add 0.8 g of glycerol and 0.6 g of Triton X-100 to the modified product II, stir at the same speed at room temperature until dissolved, and finally obtain an antifreeze type coal mine dust suppression material based on double esterification modification.

[0069] Example 6

[0070] (1) Take 0.4 g of locust bean gum in a beaker, add 200 mL of distilled water, heat to 50°C in a water bath, and stir at a constant temperature at 300 r / min for 2 hours until dissolved to obtain a locust bean gum aqueous solution;

[0071] (2) adding 0.5 g of citric acid to the locust bean gum aqueous solution, adjusting the pH of the solution to about 2-4 with dilute hydrochloric acid, and reacting at 75° C. with magnetic stirring at the same speed for 6 hours to obtain modified product I;

[0072] (3) Take 0.5 g of mushroom polysaccharide in a beaker, add a certain amount of distilled water, water bath temperature 40℃, the same speed magnetic stirring 2 hours to dissolve, get mushroom polysaccharide aqueous solution;

[0073] (4) The aqueous solution of mushroom polysaccharide is added to the modified product I, the temperature of the water bath is maintained at 75℃, and the same speed water bath stirring reaction is carried out for 6h, to obtain modified product II;

[0074] (5) 0.8g glycerol and 0.6g triton X-100 are added to the modified product II, and the same speed stirring is carried out at room temperature until dissolution, finally to obtain the anti-freezing type coal dust suppression material based on double esterification modification.

[0075] Example 7

[0076] (1) Take 0.5 g of locust bean gum in a beaker, add 200 mL of distilled water, heat the water bath to 50℃, and stir at 300 r / min for 2 hours to dissolve, to obtain locust bean gum aqueous solution;

[0077] (2) 0.3g citric acid is added to the locust bean gum aqueous solution, and the solution PH value is adjusted to about 2-4 with dilute hydrochloric acid, 75℃, the same speed magnetic stirring reaction 6 hours, to obtain modified product I;

[0078] (3) Take 0.7 g of mushroom polysaccharide in a beaker, add a certain amount of distilled water, water bath temperature 40℃, the same speed magnetic stirring 2 hours to dissolve, get mushroom polysaccharide aqueous solution;

[0079] (4) The aqueous solution of mushroom polysaccharide is added to the modified product I, the temperature of the water bath is maintained at 75℃, and the same speed water bath stirring reaction is carried out for 6h, to obtain modified product II;

[0080] (5) 0.8g glycerol and 0.6g triton X-100 are added to the modified product II, and the same speed stirring is carried out at room temperature until dissolution, finally to obtain the anti-freezing type coal dust suppression material based on double esterification modification.

[0081] Example 8

[0082] (1) Take 0.5 g of locust bean gum in a beaker, add 200 mL of distilled water, heat the water bath to 50℃, and stir at 300 r / min for 2 hours to dissolve, to obtain locust bean gum aqueous solution;

[0083] (2) 0.4g citric acid is added to the locust bean gum aqueous solution, and the solution PH value is adjusted to about 2-4 with dilute hydrochloric acid, 80℃, the same speed magnetic stirring reaction 6 hours, to obtain modified product I;

[0084] (3) Take 0.5 g of Tricholoma mongolicum Yos. polysaccharide into a beaker, add a certain amount of distilled water, and magnetically stir at the same speed for 2 hours until dissolved at a water bath temperature of 40℃ to obtain a Tricholoma mongolicum Yos. polysaccharide aqueous solution;

[0085] (4) Add the Tricholoma mongolicum Yos. polysaccharide aqueous solution into the modified product I, and maintain the water bath temperature at 80℃, and stir at the same speed for 6 hours to obtain a modified product II;

[0086] (5) Add 0.8 g of glycerol and 0.6 g of Triton X-100 into the modified product II, and stir at the same speed until dissolved at room temperature to finally obtain a freeze-resistant coal dust suppression material based on double esterification modification.

[0087] Example 9

[0088] (1) Take 0.5 g of locust bean gum into a beaker, add 200 mL of distilled water, and stir at a constant speed of 300 r / min for 2 hours until dissolved at a water bath temperature of 50℃ to obtain a locust bean gum aqueous solution;

[0089] (2) Add 0.5 g of citric acid into the locust bean gum aqueous solution, and adjust the pH value of the solution to about 2-4 with dilute hydrochloric acid, and stir at the same speed for 6 hours at 70℃ to obtain a modified product I;

[0090] (3) Take 0.6 g of Tricholoma mongolicum Yos. polysaccharide into a beaker, add a certain amount of distilled water, and magnetically stir at the same speed for 2 hours until dissolved at a water bath temperature of 40℃ to obtain a Tricholoma mongolicum Yos. polysaccharide aqueous solution;

[0091] (4) Add the Tricholoma mongolicum Yos. polysaccharide aqueous solution into the modified product I, and maintain the water bath temperature at 70℃, and stir at the same speed for 6 hours to obtain a modified product II;

[0092] (5) Add 0.8 g of glycerol and 0.6 g of Triton X-100 into the modified product II, and stir at the same speed until dissolved at room temperature to finally obtain a freeze-resistant coal dust suppression material based on double esterification modification.

[0093] Comparative Example 1

[0094] Add 0.3 g of locust bean gum into 200 mL of distilled water, heat the water bath to 50℃, and stir at a constant speed of 300 r / min for 2 hours to obtain a locust bean gum aqueous solution, and add 0.8 g of glycerol and 0.6 g of Triton X-100, and stir at a speed of 300 r / min and at room temperature until dissolved to obtain a comparative example 1 material.

[0095] Comparative Example 2

[0096] 0.3g locust bean gum and 0.3g enoki mushroom polysaccharide were dissolved in 200mL distilled water, heated to 50℃ in water bath, stirred at 300r / min for 2 hours until dissolved, and 0.8g glycerol and 0.6g triton X-100 were added, stirred at 300r / min and room temperature until dissolved to obtain the material of Comparative Example 2.

[0097] The materials prepared in Examples 1-9 and Comparative Examples 1-2 were also tested for freeze resistance and dust suppression effect, and the specific experiments were as follows:

[0098] Test 1: The materials of dust suppressants prepared in Examples 1-9 and Comparative Examples 1-2 were tested for crust hardness to detect their freeze resistance.

[0099] Test method: After sieving, the coal powder was placed in an oven and dried at 80℃ for 2h, 5g of the dried coal powder was placed in a culture dish of the same size and evenly spread, 10g of the dust suppressant material prepared in Examples 1-9 and Comparative Examples 1-2 was sprayed on the surface of the coal powder, and the surface was naturally dehydrated at-25℃. After the surface was solidified into a film, the surface crust hardness was measured with a Shore hardness tester, 8 points were taken on the surface for hardness test each time, and the average value was taken as the crust hardness of the group, which was used to detect the freeze resistance. The test results are shown in the following table.

[0100] Table 1: Freeze resistance test

[0101]

[0102]

[0103] As can be clearly seen from the test results in Table 1 above, the crust hardness of the coal layer of the examples is higher than that of the comparative examples, and the crust hardness after spraying with the examples is higher than 73HA, and the crust hardness of Example 4 is the highest, reaching 83.03HA, which shows that the dust suppression material prepared in the present application still has good crust hardness in extremely cold conditions, the dust suppression material can be tightly bonded with the coal sample, forming a dense shell film, which has good solidification and dust suppression effect, and the coal layer surface is not easy to break, causing the coal dust to fly again.

[0104] Test 2: The dust suppression effect of the dust suppressant materials prepared in Examples 1-9 and Comparative Examples 1-2 was tested.

[0105] Test method: Dust suppression simulation was carried out in the laboratory by setting up a fan, the wind speed was 12.8m / s, 5g of coal powder was evenly spread in a culture dish, a total of 11 groups were set, and then 0.5g of the dust suppression material solution prepared in Examples 1-9 and Comparative Examples 1-2 was sprayed, the total mass of the culture dish and the dust was recorded every 2min, and the dust suppression efficiency was calculated according to the following formula:

[0106]

[0107] Where: u is the dust suppression efficiency; n0 is the mass loss of the dust sample without spraying dust suppression material; n1 is the mass loss of the dust sample with spraying dust suppression material.

[0108] Depend on Figure 2 As can be seen, the total mass of the petri dishes in Example 4 reached the highest value during the test period. The total mass of the petri dishes in Example 4 was also higher than that in the comparative example, at least 24.50 g. This demonstrates that the resulting dust suppression material maintains high dust suppression effectiveness even in extremely cold conditions. The double esterification modification imparts excellent antifreeze properties to the material. Therefore, this dust suppressant effectively wets and agglomerates dust, effectively improving the dust reduction efficiency of hydrophobic coal dust.

[0109] In summary, the dust suppression material prepared by the present invention can effectively resist freezing and efficiently suppress dust, alleviate the technical problem of low dust suppression effect of coal mine dust suppression materials in extremely cold environments, and has broad market prospects.

[0110] In the description of the present invention, the terms "first," "second," "another," and "yet another" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0111] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0112] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. Antifreeze type coal mine dust suppression material based on double esterification modification, characterized in that: By weight percentage, the raw materials for preparation include: 2.5-4 parts of locust bean gum, 1.5-2 parts of esterification agent, 1.5-3 parts of Flammulina velutipes polysaccharide, 2-6 parts of wetting agent, 2-4 parts of water retaining agent, and the balance is solvent.

2. The antifreeze type coal mine dust suppression material based on double esterification modification according to claim 1, characterized in that: Citric acid was selected as the esterification reagent.

3. The antifreeze type coal mine dust suppression material based on double esterification modification according to claim 2, characterized in that: The wetting agent is a nonionic surfactant and the water retaining agent is a polyol compound.

4. The antifreeze type coal mine dust suppression material based on double esterification modification according to claim 3, characterized in that: The nonionic surfactant is Triton X-100, and the polyol compound is glycerol.

5. The antifreeze-type coal mine dust suppression material based on double esterification modification and its preparation method according to claim 4, characterized in that: The solvent used was distilled water.

6. The antifreeze type coal mine dust suppression material based on double esterification modification according to claim 5, characterized in that: Under the condition of 200 mL of distilled water, the weight of each raw material is: 0.3 g locust bean gum, 0.3 g citric acid, 0.5 g Flammulina velutipes polysaccharide, 0.8 g Triton X-100, and 0.6 g glycerol.

7. A method for preparing the antifreeze-type coal mine dust suppression material based on double esterification modification according to claim 5 or 6, characterized in that: The steps include: S1. Dispersing locust bean gum in distilled water, stirring and dissolving at 40-60° C. to obtain a locust bean gum solution; S2. Add citric acid to the solution obtained in S1, adjust the pH to 2-4, and stir the mixture at 70-90°C for 6 hours to obtain modified product I; S3, dispersing the Flammulina velutipes polysaccharide in distilled water, stirring and dissolving at 30-50° C. to obtain a Flammulina velutipes polysaccharide solution; S4, mixing the solution obtained in S3 with the modified product I obtained in S2, and stirring the mixture at 70-90° C. for 6 hours to obtain a modified product II; S5. Add glycerol and Triton X-100 to the modified product II obtained in S4, and stir at room temperature until dissolved to obtain a double esterified modified antifreeze type coal mine dust suppression material.

8. The method for preparing the antifreeze-type coal mine dust suppression material based on double esterification modification according to claim 7, characterized in that: In S1 and S3, the stirring speed was 300 r / min and the stirring time was 2 hours.

9. The antifreeze-type coal mine dust suppression material based on double esterification modification and its preparation method according to claim 7, characterized in that: Dilute hydrochloric acid was used to adjust the pH value in S2 and S4.

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