High-film-forming-property fog-state dust suppression material for improving wettability of hydrophobic coal dust and preparation method

Abstract

The invention discloses a high-film-forming-property fog-state dust suppression material capable of improving hydrophobic coal dust wettability and a preparation method of the high-film-forming-property fog-state dust suppression material, and relates to the technical field of comprehensive dust prevention. 1.5 to 3.5 parts of succinic acid; 1-6 parts of silk fibroin; 3-7 parts of a condensation reagent; 3-5 parts of a catalyst; 6-10 parts of a wetting agent; 2-8 parts of a water-retaining agent; and the balance of distilled water. The preparation method comprises the following steps: preparing a tamarind gum aqueous solution; succinic acid is added into the tamarind gum aqueous solution, the pH value is adjusted, and a modified solution I is prepared; preparing a silk fibroin aqueous solution; adding a silk fibroin aqueous solution into the modified solution I, and adding a condensation reagent and a catalyst to prepare a modified solution II; and adding a water-retaining agent and a wetting agent into the modified solution II to obtain the fog-state dust suppression material with high film-forming property. The high-film-forming-property fog-state dust suppression material for improving hydrophobic coal dust wettability has the advantages of being good in film forming effect and wettability, high in dust suppression efficiency and the like.

Description

Technical Field

[0001] The present invention relates to the field of comprehensive dust prevention technology, and in particular to a high film-forming mist dust suppression material for improving the wettability of hydrophobic coal dust and a preparation method thereof. Background Art

[0002] With the development of the mining industry, the pollution problem of dust in mining areas has become increasingly prominent. When the dust concentration reaches a certain amount, it is easy to cause the risk of spontaneous combustion and explosion. In addition, coal miners inhale dust for a long time during production operations, which will cause pneumoconiosis characterized by diffuse nodular or lattice fibrosis (PMF) of lung tissue. In order to suppress the escape of coal dust during coal mining and transportation, and reduce the harm to the coal mine production environment and the health of workers, it is urgent to solve the problems of excessive coal dust concentration and difficult suspension sedimentation. Spray dust removal is one of the most widely used, convenient and effective dust removal methods. The efficiency of underground spray dust removal is only about 40%. Adding chemical dust suppression materials to the spray can effectively reduce the contact angle between coal dust and water, effectively improve the dust fog collision and condensation effect, and perform high-intensity solidification of the settled dust to avoid secondary dust.

[0003] Chemical dust suppression materials are widely used in the coal mining field due to their advantages such as easy raw material acquisition and simple manufacturing process. However, traditional chemical dust suppression materials generally have problems such as short dust suppression effect duration and poor film-forming properties. Once sprayed, the surface consolidation layer is easily destroyed, the consolidation effect is greatly reduced, and secondary dust is easily caused. Multiple spraying is required in time, which consumes more dust suppression materials and has poor economic benefits. In addition, as an additive for spray dust reduction technology, it is often difficult for the hydrophobic coal dust to be collided and condensed by the droplet particles due to insufficient wettability of the aqueous solution. The contact angle between the coal dust and the aqueous solution exceeds 60°, resulting in low spray dust reduction efficiency.

[0004] Therefore, there is an urgent need to develop a highly film-forming mist dust suppression material that can enhance the wettability of hydrophobic coal dust, improve the efficiency of spray dust suppression, and promote coal mine production to develop in a safer, cleaner, and more efficient direction. Summary of the invention

[0005] In order to solve the technical problem of poor wettability and film-forming property of dust suppression materials, the present invention discloses a high film-forming mist dust suppression material for improving the wettability of hydrophobic coal dust and a preparation method thereof.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The high film-forming mist dust suppression material for improving the wettability of hydrophobic coal dust, the raw materials are as follows in parts by weight:

[0008] 2-8 parts of tamarind gum

[0009] Succinic acid 1.5-3.5 parts

[0010] 1-6 parts of silk fibroin

[0011] 3-7 parts of condensation reagent

[0012] 3-5 parts of catalyst

[0013] Wetting agent 6-10 parts

[0014] 2-8 parts water retaining agent

[0015] The balance is distilled water.

[0016] Optionally, the condensation reagent is dicyclohexylcarbodiamine.

[0017] Optionally, the catalyst is N-hydroxysuccinimide.

[0018] Optionally, the wetting agent is polyoxyethylene fatty alcohol ether.

[0019] Optionally, the water retaining agent is glycerol.

[0020] Tamarind gum has strong viscosity and good water retention, emulsification and film-forming properties. It can form a dense protective film on the surface of the coal seam, effectively suppressing the escape of coal dust. It is also resistant to salt, heat, acid, freezing and thawing. It is a natural, renewable resource with good biodegradability and a potential dust suppression material.

[0021] Succinic acid is a non-toxic, naturally degradable organic acid. Because it contains carboxyl groups, it has good modification properties and can undergo esterification reaction with hydroxyl groups under certain conditions to improve the water solubility of the modified product.

[0022] Silk fibroin is a natural high molecular weight fiber protein extracted from silk. It has many excellent properties such as adhesion, film-forming, and biodegradability. Because it contains amino groups, it can undergo cross-linking reactions with carboxyl groups to form amide bonds, thereby improving the film-forming and adhesive properties of the modified product.

[0023] Dicyclohexylcarbodiamine is an important organic compound, often used as a coupling reagent in organic synthesis, which can activate the carboxyl group and promote the formation of amide bonds;

[0024] N-Hydroxysuccinimide is widely used in the biomedical field and is often used as a catalyst in the process of amide bond formation, which can accelerate the reaction rate and increase the yield.

[0025] Glycerin is a relatively stable compound with strong moisturizing ability and permeability. It can penetrate into the coal dust particles to form a protective film, further enhancing the dust suppression effect. It is widely used in the field of dust suppression material research. It is non-toxic and harmless and will not pollute the environment.

[0026] Polyoxyethylene fatty alcohol ether has good surface activity and dispersibility, which can make liquids spread more easily on solid surfaces, thereby improving wettability. It is widely used as a wetting agent in the field of dust suppression materials. It is synthesized from natural substances, is non-toxic and harmless, can be naturally degraded under appropriate conditions, and has good environmental protection.

[0027] The present invention also provides a method for preparing the above-mentioned high film-forming mist dust suppression material for improving the wettability of hydrophobic coal dust, comprising the following steps:

[0028] (1) mixing tamarind gum and distilled water, adjusting the water bath heating temperature to 70° C., and heating and stirring at a constant temperature of 300 r / min for 4 h to obtain a tamarind gum aqueous solution;

[0029] (2) adding succinic acid to the tamarind gum aqueous solution and adjusting the pH value of the solution to 6, placing the pH-adjusted solution in a magnetic stirring constant temperature water bath at 70° C., rotating at 300 r / min, and stirring for 2 h to obtain a modified solution I;

[0030] (3) adding silk fibroin into a beaker containing distilled water, adjusting the pH value to 6, placing in a magnetic stirring water bath at 25° C., rotating at 300 r / min, stirring for 1 h, and separating impurities by centrifugation to obtain a silk fibroin aqueous solution;

[0031] (4) using a separatory funnel, adding the silk fibroin aqueous solution to the modified solution I, adding a condensation reagent and a catalyst, raising the temperature of the water bath to 40° C., stirring for 1 h at a speed of 300 r / min, and obtaining a modified solution II;

[0032] (5) Add a water retaining agent and a wetting agent to the modified solution II, stir until dissolved at room temperature, and rotate at 300 r / min to obtain a highly film-forming mist dust suppression material.

[0033] Optionally, the condensation agent is dicyclohexylcarbodiamine, the catalyst is N-hydroxysuccinimide, the wetting agent is polyoxyethylene fatty alcohol ether, and the water retaining agent is glycerol.

[0034] Reaction equation of the present invention is as follows: (1)

[0036] (2)

[0038]

[0039] Reaction principle of the present invention:

[0040] (1) Biodegradable succinic acid contains a hydrophilic group carboxyl. The carboxyl group reacts with the hydroxyl group in succinic acid to form an ester bond (-COO-) by removing a molecule of water. The ester bond is then modified on the main chain of tamarind gum to obtain carboxyl-modified tamarind gum, which greatly improves the water solubility of tamarind gum, enables it to better enhance the wettability of hydrophobic coal dust, and improves the dust suppression efficiency.

[0041] (2) Under the action of catalyst N-hydroxysuccinimide and condensation reagent dicyclohexylcarbodiamine, the carboxyl group (-COOH) in the modified product I and the amino group in the natural biodegradable polymer silk fibroin (SF) lose a hydroxyl group (-OH) and the amino group (-NH2) loses a hydrogen atom (H). The two groups combine together to undergo a cross-linking reaction, releasing a molecule of water and eventually forming an amide bond (-CONH-), thereby improving the film-forming performance and stability of the material.

[0042] The beneficial effects of the present invention are:

[0043] (1) The tamarind gum selected in the present invention has high viscosity, but too high viscosity will lead to poor spray atomization effect and affect the spray dust removal efficiency. Its molecular structure contains a large number of hydroxyl groups. Therefore, succinic acid is added, and the hydroxyl groups in the tamarind gum react with the carboxyl groups in the succinic acid to connect the carboxyl groups to the main chain of the tamarind gum, thereby improving the water solubility and viscosity characteristics of the tamarind gum through esterification reaction.

[0044] (2) Silk fibroin itself has excellent film-forming properties and biodegradability. It can be combined with modified product I through the amino groups it carries. Among them, modified product I carries a carboxyl group that can undergo chemical cross-linking with the amino groups in silk fibroin to form an amide bond, thereby improving the film-forming property of modified product II. This makes the dust suppression material resistant to flushing and has strong stability in harsh environments, preventing coal dust particles from escaping and causing secondary pollution.

[0045] (3) The high film-forming mist dust suppression material for improving the wettability of hydrophobic coal dust prepared by the present invention has high film-forming property and wettability, can better combine with the surface of the coal seam to form a stable protective film, thereby more effectively fixing the coal dust particles. By adding polyoxyethylene fatty alcohol ether, the hydrophilic group polyoxyethylene chain in its molecular structure can interact with water molecules, and the hydrophobic group fatty alcohol chain can interact with the solid surface. This dual effect enables polyoxyethylene fatty alcohol ether to form a uniform film on the surface of coal dust, thereby further improving wettability. Combined with its own excellent adhesion, it can more efficiently capture fine coal dust in the air, thereby effectively preventing the secondary flying of coal dust.

[0046] In summary, the high film-forming mist dust suppression material for improving the wettability of hydrophobic coal dust prepared by the present invention has multiple advantages such as good film-forming effect, wetting performance, and high dust suppression efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a test picture of film-forming effect;

[0048] Figure 2 The present invention is a process flow chart of a method for preparing a highly film-forming mist dust suppression material for improving the wettability of hydrophobic coal dust. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0050] Example 1

[0051] (1) Add distilled water to a beaker, set the water bath temperature to 70° C., dissolve 0.5 g of tamarind gum in 100 mL of water, and stir in a water bath at a speed of 300 r / min for 4 h until dissolved to obtain a tamarind gum aqueous solution;

[0052] (2) adding 0.2 g of succinic acid to the tamarind gum aqueous solution and adjusting the pH value of the solution to 6, placing the pH-adjusted solution in a magnetic stirring constant temperature water bath at 70° C., rotating at 300 r / min, and stirring for 2 h to obtain a modified solution I;

[0053] (3) Add 0.5 g of silk fibroin into a beaker containing distilled water, adjust the pH value to 6, place in a magnetic stirring water bath at 25°C, rotate at 300 r / min, stir for 1 h, and separate impurities by centrifugation to obtain a silk fibroin aqueous solution;

[0054] (4) raising the temperature of the water bath to 40° C., adding the silk fibroin aqueous solution to the modified solution I, and adding 0.3 g of dicyclohexylcarbodiamine and 0.4 g of N-hydroxysuccinimide, stirring for 1 h at a speed of 300 r / min to obtain a modified solution II;

[0055] (5) Add 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether to the modified solution II, stir until dissolved at room temperature, and rotate at 300 r / min to finally obtain a dust suppression material with high wettability, high film-forming property and good dust suppression effect.

[0056] Example 2

[0057] (1) Add distilled water to a beaker, set the water bath temperature to 70° C., dissolve 0.5 g of tamarind gum in 100 mL of water, and stir in a water bath at a speed of 300 r / min for 4 h until dissolved to obtain a tamarind gum aqueous solution;

[0058] (2) adding 0.3 g of succinic acid to the tamarind gum aqueous solution and adjusting the pH value of the solution to 6, placing the pH-adjusted solution in a magnetic stirring constant temperature water bath at 60° C., rotating at 300 r / min, and stirring for 2 h to obtain a modified solution I;

[0059] (3) Add 0.4 g of silk fibroin into a beaker containing distilled water, adjust the pH value to 6, place in a magnetic stirring water bath at 25°C, rotate at 300 r / min, stir for 1 h, and separate impurities by centrifugation to obtain a silk fibroin aqueous solution;

[0060] (4) raising the temperature of the water bath to 40° C., adding the silk fibroin aqueous solution to the modified solution I, and adding 0.3 g of dicyclohexylcarbodiamine and 0.4 g of N-hydroxysuccinimide, stirring for 1 h at a speed of 300 r / min to obtain a modified solution II;

[0061] (5) Add 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether to the modified solution II, stir until dissolved at room temperature, and rotate at 300 r / min to finally obtain a dust suppression material with high wettability, high film-forming property and good dust suppression effect.

[0062] Example 3

[0063] (1) Add distilled water to a beaker, set the water bath temperature to 70° C., dissolve 0.5 g of tamarind gum in 100 mL of water, and stir in a water bath at a speed of 300 r / min for 4 h until dissolved to obtain a tamarind gum aqueous solution;

[0064] (2) adding 0.4 g of succinic acid to the tamarind gum aqueous solution and adjusting the pH value of the solution to 6, placing the pH-adjusted solution in a magnetic stirring constant temperature water bath at 50° C., rotating at 300 r / min, and stirring for 2 h to obtain a modified solution I;

[0065] (3) Add 0.3 g of silk fibroin into a beaker containing distilled water, adjust the pH value to 6, place in a magnetic stirring water bath at 25°C, rotate at 300 r / min, stir for 1 h, and separate impurities by centrifugation to obtain a silk fibroin aqueous solution;

[0066] (4) raising the temperature of the water bath to 40° C., adding the silk fibroin aqueous solution to the modified solution I, and adding 0.3 g of dicyclohexylcarbodiamine and 0.4 g of N-hydroxysuccinimide, stirring for 1 h at a speed of 300 r / min to obtain a modified solution II;

[0067] (5) Add 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether to the modified solution II, stir until dissolved at room temperature, and rotate at 300 r / min to finally obtain a dust suppression material with high wettability, high film-forming property and good dust suppression effect.

[0068] Example 4

[0069] (1) Add distilled water to a beaker, set the water bath temperature to 70° C., dissolve 0.4 g of tamarind gum in 100 mL of water, and stir in a water bath at a speed of 300 r / min for 4 h until dissolved to obtain a tamarind gum aqueous solution;

[0070] (2) adding 0.2 g of succinic acid to the tamarind gum aqueous solution and adjusting the pH value of the solution to 6, placing the pH-adjusted solution in a magnetic stirring constant temperature water bath at 50° C., rotating at 300 r / min, and stirring for 2 h to obtain a modified solution I;

[0071] (3) Add 0.5 g of silk fibroin into a beaker containing distilled water, adjust the pH value to 6, place in a magnetic stirring water bath at 25°C, rotate at 300 r / min, stir for 1 h, and separate impurities by centrifugation to obtain a silk fibroin aqueous solution;

[0072] (4) raising the temperature of the water bath to 40° C., adding the silk fibroin aqueous solution to the modified solution I, and adding 0.3 g of dicyclohexylcarbodiamine and 0.4 g of N-hydroxysuccinimide, stirring for 1 h at a speed of 300 r / min to obtain a modified solution II;

[0073] (5) Add 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether to the modified solution II, stir until dissolved at room temperature, and rotate at 300 r / min to finally obtain a dust suppression material with high wettability, high film-forming property and good dust suppression effect.

[0074] Example 5

[0075] (1) Add distilled water to a beaker, set the water bath temperature to 70° C., dissolve 0.4 g of tamarind gum in 100 mL of water, and stir in a water bath at a speed of 300 r / min for 4 h until dissolved to obtain a tamarind gum aqueous solution;

[0076] (2) adding 0.3 g of succinic acid to the tamarind gum aqueous solution and adjusting the pH value of the solution to 6, placing the pH-adjusted solution in a magnetic stirring constant temperature water bath at 70° C., rotating at 300 r / min, and stirring for 2 h to obtain a modified solution I;

[0077] (3) Add 0.4 g of silk fibroin into a beaker containing distilled water, adjust the pH value to 6, place in a magnetic stirring water bath at 25°C, rotate at 300 r / min, stir for 1 h, and separate impurities by centrifugation to obtain a silk fibroin aqueous solution;

[0078] (4) raising the temperature of the water bath to 40° C., adding the silk fibroin aqueous solution to the modified solution I, and adding 0.3 g of dicyclohexylcarbodiamine and 0.4 g of N-hydroxysuccinimide, stirring for 1 h at a speed of 300 r / min to obtain a modified solution II;

[0079] (5) Add 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether to the modified solution II, stir until dissolved at room temperature, and rotate at 300 r / min to finally obtain a dust suppression material with high wettability, high film-forming property and good dust suppression effect.

[0080] Example 6

[0081] (1) Add distilled water to a beaker, set the water bath temperature to 70° C., dissolve 0.4 g of tamarind gum in 100 mL of water, and stir in a water bath at a speed of 300 r / min for 4 h until dissolved to obtain a tamarind gum aqueous solution;

[0082] (2) adding 0.4 g of succinic acid to the tamarind gum aqueous solution and adjusting the pH value of the solution to 6, placing the pH-adjusted solution in a magnetic stirring constant temperature water bath at 60° C., rotating at 300 r / min, and stirring for 2 h to obtain a modified solution I;

[0083] (3) Add 0.3 g of silk fibroin into a beaker containing distilled water, adjust the pH value to 6, place in a magnetic stirring water bath at 25°C, rotate at 300 r / min, stir for 1 h, and separate impurities by centrifugation to obtain a silk fibroin aqueous solution;

[0084] (4) raising the temperature of the water bath to 40° C., adding the silk fibroin aqueous solution to the modified solution I, and adding 0.3 g of dicyclohexylcarbodiamine and 0.4 g of N-hydroxysuccinimide, stirring for 1 h at a speed of 300 r / min to obtain a modified solution II;

[0085] (5) Add 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether to the modified solution II, stir until dissolved at room temperature, and rotate at 300 r / min to finally obtain a dust suppression material with high wettability, high film-forming property and good dust suppression effect.

[0086] Example 7

[0087] (1) Add distilled water to a beaker, set the water bath temperature to 70° C., dissolve 0.3 g of tamarind gum in 100 mL of water, and stir in a water bath at a speed of 300 r / min for 4 h until dissolved to obtain a tamarind gum aqueous solution;

[0088] (2) adding 0.2 g of succinic acid to the tamarind gum aqueous solution and adjusting the pH value of the solution to 6, placing the pH-adjusted solution in a 60° C. magnetic stirring constant temperature water bath at a speed of 300 r / min and stirring for 2 h to obtain a modified solution I;

[0089] (3) Add 0.5 g of silk fibroin into a beaker containing distilled water, adjust the pH value to 6, place in a magnetic stirring water bath at 25°C, rotate at 300 r / min, stir for 1 h, and separate impurities by centrifugation to obtain a silk fibroin aqueous solution;

[0090] (4) raising the temperature of the water bath to 40° C., adding the silk fibroin aqueous solution to the modified solution I, and adding 0.3 g of dicyclohexylcarbodiamine and 0.4 g of N-hydroxysuccinimide, stirring for 1 h at a speed of 300 r / min to obtain a modified solution II;

[0091] (5) Add 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether to the modified solution II, stir until dissolved at room temperature, and rotate at 300 r / min to finally obtain a dust suppression material with high wettability, high film-forming property and good dust suppression effect.

[0092] Example 8

[0093] (1) Add distilled water to a beaker, set the water bath temperature to 70° C., dissolve 0.3 g of tamarind gum in 100 mL of water, and stir in a water bath at a speed of 300 r / min for 4 h until dissolved to obtain a tamarind gum aqueous solution;

[0094] (2) adding 0.3 g of succinic acid to the tamarind gum aqueous solution and adjusting the pH value of the solution to 6, placing the pH-adjusted solution in a magnetic stirring constant temperature water bath at 50° C., rotating at 300 r / min, and stirring for 2 h to obtain a modified solution I;

[0095] (3) Add 0.4 g of silk fibroin into a beaker containing distilled water, adjust the pH value to 6, place in a magnetic stirring water bath at 25°C, rotate at 300 r / min, stir for 1 h, and separate impurities by centrifugation to obtain a silk fibroin aqueous solution;

[0096] (4) raising the temperature of the water bath to 40° C., adding the silk fibroin aqueous solution to the modified solution I, and adding 0.3 g of dicyclohexylcarbodiamine and 0.4 g of N-hydroxysuccinimide, stirring for 1 h at a speed of 300 r / min to obtain a modified solution II;

[0097] (5) Add 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether to the modified solution II, stir until dissolved at room temperature, and rotate at 300 r / min to finally obtain a dust suppression material with high wettability, high film-forming property and good dust suppression effect.

[0098] Example 9

[0099] (1) Add distilled water to a beaker, set the water bath temperature to 70° C., dissolve 0.3 g of tamarind gum in 100 mL of water, and stir in a water bath at a speed of 300 r / min for 4 h until dissolved to obtain a tamarind gum aqueous solution;

[0100] (2) adding 0.4 g of succinic acid to the tamarind gum aqueous solution and adjusting the pH value of the solution to 6, placing the pH-adjusted solution in a magnetic stirring constant temperature water bath at 70° C., rotating at 300 r / min, and stirring for 2 h to obtain a modified solution I;

[0101] (3) Add 0.3 g of silk fibroin into a beaker containing distilled water, adjust the pH value to 6, place in a magnetic stirring water bath at 25°C, rotate at 300 r / min, stir for 1 h, and separate impurities by centrifugation to obtain a silk fibroin aqueous solution;

[0102] (4) raising the temperature of the water bath to 40° C., adding the silk fibroin aqueous solution to the modified solution I, and adding 0.3 g of dicyclohexylcarbodiamine and 0.4 g of N-hydroxysuccinimide, stirring for 1 h at a speed of 300 r / min to obtain a modified solution II;

[0103] (5) Add 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether to the modified solution II, stir until dissolved at room temperature, and rotate at 300 r / min to finally obtain a dust suppression material with high wettability, high film-forming property and good dust suppression effect.

[0104] Comparative Example 1

[0105] 0.5 g of tamarind gum was dissolved in 100 mL of distilled water, and 0.8 g of polyoxyethylene fatty alcohol ether was added thereto, and the mixture was stirred at a rotation speed of 300 r / min and room temperature until dissolved, to obtain the material of Comparative Example 1.

[0106] Comparative Example 2

[0107] 0.5 g of tamarind gum and 0.2 g of succinic acid were dissolved in 100 mL of distilled water, and 0.8 g of polyoxyethylene fatty alcohol ether was added thereto, and stirred at a rotation speed of 300 r / min and room temperature until dissolved, to obtain the material of Comparative Example 2.

[0108] The following tests were conducted on the film-forming effect, wettability and dust reduction rate of the materials obtained in Examples 1-9 and Comparative Examples 1-2.

[0109] Test 1

[0110] The following is a film-forming effect test of the dust suppression materials prepared in Examples 1-9 and Comparative Examples 1-2.

[0111] The dust suppression materials of Examples 1-9 were sprayed on the coal pile, and the samples treated with the dust suppression materials of Comparative Examples 1-2 were used as the control group. The coal pile was placed outdoors, and after drying, a spray device was used to simulate outdoor rainfall. The spraying time was 5 minutes, the water volume was 25 mm, and the spraying speed was 5 mm / min. After the test, the accumulated water in the culture dish was poured out, placed in a drying box, and the mass after drying was weighed. The film-forming effect of the dust suppression material was determined by calculating the mass loss rate.

[0112]

[0113] Wherein, p is the mass loss rate, %; M1 is the mass of the culture dish, g; M1 is the mass of the coal powder and the culture dish after the dust suppression material is solidified and formed into a film, g; M3 is the mass of the coal powder and the culture dish after the coal powder is dried, g.

[0114] After the water evaporates and dries, the hardness of the cured layer is measured using a Shore hardness tester. Each sample is tested 3 times and the average value is taken. Figure 1 shown.

[0115] The results of the analysis test 1 show that compared with the comparative examples 1-2, the mass loss rates of the embodiments 1-9 are all lower than 75%, among which the mass loss rate of the embodiment 5 is the lowest, which is 67.38%. The results show that the dust suppression material of this invention has a high film-forming property and can effectively improve the erosion resistance of the coal seam surface. The sample crust hardness of the spraying embodiment can reach up to 83.76HA, which is much greater than the film hardness of the comparative examples 1-2, and has an excellent curing effect.

[0116] Test 2

[0117] The wettability test of the dust suppression materials prepared in Examples 1-9 and Comparative Examples 1-2 is performed below.

[0118] The test method is: using a tablet press with a certain working pressure, keeping the coal sample under this pressure for 3 minutes to make a cylindrical sample with a diameter of 10 mm and a height of 6 mm, and having a flat and smooth surface, and using Shanghai JC2000C1 contact angle measuring instrument to measure the contact angles of the dust suppression materials prepared in Examples 1-9 and the dust suppression materials prepared in Comparative Examples 1-2 on the coal surface, respectively. The test results are shown in Table 1.

[0119] Table 1 Contact angle test

[0120]

[0121] It can be seen from Table 1 that the contact angles of the dust suppression materials and coal samples prepared in Comparative Examples 1-2 are greater than the contact angles of the dust suppression materials and coal samples prepared in Examples 1-9, and the contact angle of Example 5 after 4 seconds is 16.30°, indicating that the dust suppression material prepared by the present invention has significant wetting properties. This is because the prepared dust suppression material contains a large number of polar hydrophilic groups, which can reduce the surface tension of water to below the critical surface tension of the solid. Therefore, the dust suppression material has good wetting properties and can effectively and timely suppress the flying of coal dust.

[0122] Test 3

[0123] The following is a spray dust reduction rate test on the dust suppression materials prepared in Examples 1-9 and Comparative Examples 1-2.

[0124] The test method is as follows: based on the wind flow-droplet-dust coupling experimental platform, under the same wind speed conditions, 50g of hydrophobic coal powder (5s contact angle is 63.4°) is taken, and a dust generator is used to perform quantitative and stable emission at 32g / min to simulate the dust escape effect. The chemical dust suppression materials prepared in Examples 1-9 and Comparative Examples 1-2 are respectively added to the spray aqueous solution, and a single swirl atomizing nozzle is used to spray the dust in the wind flow-droplet-dust coupling experimental platform with a dust suppression material aqueous solution at different spray pressures of 1 to 8MPa to settle the dust in the experimental platform. Subsequently, a mining dust sampler is used to sample the dust, weigh it, and obtain the dust concentration. The spray dust reduction rate is calculated by measuring the concentration before and after the spray, that is, (dust concentration before spraying-dust concentration after spraying) / dust concentration before spraying × 100%. The test results are shown in Table 2.

[0125] Table 2 Dust reduction efficiency test

[0126]

[0127] According to the statistical data, the highest spray dust reduction rate of Example 5 has reached 83.2%, and the dust reduction rates of the nine examples under the eight recorded spray pressure conditions are all higher than those of the comparative example. Therefore, the dust suppression material can have a good effect of wetting and condensing dust, and effectively improve the dust reduction efficiency of hydrophobic coal dust.

[0128] In summary, the dust suppression material prepared by the present invention can suppress dust with high efficiency, effectively solve the technical problems of poor wettability of hydrophobic coal dust and poor film-forming property of dust suppression material leading to average dust reduction rate and dust suppression rate, and has broad market prospects.

[0129] The above description is only a specific implementation mode of the present invention, so that those skilled in the art can understand or implement the present invention. Of course, the present invention is not limited to the above examples. Those skilled in the art can still modify or replace the aforementioned technical solutions, and these modifications or replacements do not make the essence of the present invention deviate from the scope of the technical solutions of each embodiment, and also belong to the protection scope.

[0130] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A highly film-forming mist dust suppression material for improving the wettability of hydrophobic coal dust, characterized in that: The raw materials are as follows according to weight parts: 2-8 parts of tamarind gum Succinic acid 1.5-3.5 parts 1-6 parts of silk fibroin 3-7 parts of condensation reagent 3-5 parts of catalyst Wetting agent 6-10 parts 2-8 parts water retaining agent The balance is distilled water.

2. The highly film-forming mist dust suppression material for improving the wettability of hydrophobic coal dust according to claim 1, characterized in that: The condensation reagent is dicyclohexylcarbodiamine.

3. The highly film-forming mist dust suppression material for improving the wettability of hydrophobic coal dust according to claim 1, characterized in that: The catalyst is N-hydroxysuccinimide.

4. The highly film-forming mist dust suppression material for improving the wettability of hydrophobic coal dust according to claim 1, characterized in that: The wetting agent is polyoxyethylene fatty alcohol ether.

5. The highly film-forming mist dust suppression material for improving the wettability of hydrophobic coal dust according to claim 1, characterized in that: The water retaining agent is glycerol.

6. A method for preparing a highly film-forming mist dust suppression material for improving the wettability of hydrophobic coal dust as claimed in claim 1, characterized in that: The steps include: (1) mixing tamarind gum and distilled water, adjusting the water bath heating temperature to 70° C., and heating and stirring at a constant temperature of 300 r / min for 4 h to obtain a tamarind gum aqueous solution; (2) adding succinic acid to the tamarind gum aqueous solution and adjusting the pH value of the solution to 6, placing the pH-adjusted solution in a magnetic stirring constant temperature water bath at 70° C., rotating at 300 r / min, and stirring for 2 h to obtain a modified solution I; (3) adding silk fibroin into a beaker containing distilled water, adjusting the pH value to 6, placing in a magnetic stirring water bath at 25° C., rotating at 300 r / min, stirring for 1 h, and separating impurities by centrifugation to obtain a silk fibroin aqueous solution; (4) using a separatory funnel, adding the silk fibroin aqueous solution to the modified solution I, adding a condensation reagent and a catalyst, raising the temperature of the water bath to 40° C., stirring for 1 h at a speed of 300 r / min, and obtaining a modified solution II; (5) Add a water retaining agent and a wetting agent to the modified solution II, stir until dissolved at room temperature, and rotate at 300 r / min to obtain a highly film-forming mist dust suppression material.

7. The method for preparing a highly film-forming mist dust suppression material for improving the wettability of hydrophobic coal dust according to claim 6, characterized in that: The condensation agent is dicyclohexylcarbodiamine, the catalyst is N-hydroxysuccinimide, the wetting agent is polyoxyethylene fatty alcohol ether, and the water retaining agent is glycerol.

Images