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

Abstract

The application discloses a high-film-forming fog-state dust suppression material for improving hydrophobic coal dust wettability and a preparation method, relates to the field of comprehensive dust prevention technology, and discloses the following ingredients by weight: 2-8 parts of tamarind gum; 1.5-3.5 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; adding succinic acid to the tamarind gum aqueous solution and adjusting the pH value to prepare a modified solution I; preparing a silk fibroin aqueous solution; adding the silk fibroin aqueous solution to the modified solution I, adding a condensation reagent and a catalyst to prepare a modified solution II; and adding a water-retaining agent and a wetting agent to the modified solution II to obtain the high-film-forming fog-state dust suppression material. The high-film-forming fog-state dust suppression material for improving hydrophobic coal dust wettability prepared by the application has the advantages of good film-forming effect, wettability and dust suppression efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of comprehensive dust prevention, and in particular to a high-film-forming fog-state dust suppression material for improving the wettability of hydrophobic coal dust and a preparation method thereof. BACKGROUND

[0002] With the development of the mining industry, the problem of dust pollution in mining areas is increasingly prominent. When the dust concentration reaches a certain amount, it is easy to cause spontaneous combustion and explosion hazards. In addition, long-term inhalation of dust by coal mine workers during production operations can cause pneumoconiosis characterized by diffuse nodular or reticular fibrosis (PMF) of the lung tissue. In order to inhibit the dispersion of coal dust during coal mining and transportation and reduce the harm to the production environment of coal mines and the health of workers, it is urgent to solve the problems of coal dust concentration exceeding the limit and suspended dust being difficult to settle. Spray dust removal is one of the most widely used, most 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 of coal dust and water, effectively improve the collision and coagulation effect of dust fog, and perform high-strength solidification on settled dust to avoid secondary dust raising.

[0003] Chemical dust suppression materials are widely used in the coal mining field due to their advantages of easy availability of raw materials and simple manufacturing process. However, traditional chemical dust suppression materials generally have the problems of short dust suppression effect duration and poor film-forming property. Once sprayed, the surface solidification layer is easily damaged, the solidification effect is greatly reduced, secondary dust raising is easily caused, and multiple spraying needs to be performed in time, which consumes more dust suppression materials and has poor economic benefits. In addition, as an additive for spray dust removal technology, the water solution is not wet enough, the contact angle between coal dust and the water solution is more than 60°, hydrophobic coal dust is difficult to be collided and coagulated by fog droplet particles, and the spray dust removal efficiency is not high.

[0004] Therefore, it is urgent to develop a high-film-forming fog-state dust suppression material for improving the wettability of hydrophobic coal dust, to improve the spray dust removal efficiency and promote the development of coal mine production towards a safer, cleaner and more efficient direction. SUMMARY

[0005] To solve the technical problem of poor wettability and film-forming property of dust suppression materials, the present application discloses a high-film-forming fog-state dust suppression material for improving the wettability of hydrophobic coal dust and a preparation method thereof.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solution:

[0007] The high-film-forming fog-state dust suppression material for improving the wettability of hydrophobic coal dust has the following raw materials in terms of weight parts:

[0008] Tamarind gum 2-8 parts

[0009] Succinic acid 1.5-3.5 parts

[0010] Silk fibroin 1-6 parts

[0011] Condensation reagent 3-7 parts

[0012] Catalyst 3-5 parts

[0013] Wetting agent 6-10 parts

[0014] Water-retaining agent 2-8 parts

[0015] The balance is distilled water.

[0016] Optionally, the condensation reagent is dicyclohexyl carbodiimide.

[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, good water retention, emulsification and film forming properties, and can form a dense protective film on the surface of coal seam, effectively suppressing dust dispersion, and has salt, heat, acid, cold and freeze-thaw resistance. It is a natural, renewable and biodegradable resource, and is a potential dust suppression material.

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

[0022] Silk fibroin is a natural high molecular weight fibroin extracted from silk, which has adhesion, film forming property, biodegradability and other excellent properties. Due to the presence of amino groups, it can crosslink with carboxyl groups to form amide bonds, thereby improving the film forming property and adhesion of the modified product.

[0023] Dicyclohexyl carbodiimide is an important organic compound, often used as a coupling reagent in organic synthesis, which can activate carboxyl groups to promote the formation of amide bonds.

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

[0025] Glycerol is a relatively stable compound with strong moisturizing ability and permeability, which can penetrate into the space between coal dust particles and form a protective film to further enhance the dust suppression effect. It is widely used in the field of dust suppression material research and is non-toxic and harmless, without causing environmental pollution.

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

[0027] The application further provides a preparation method of the high-film-forming high-hydrophobic coal dust wettability-improving mist state dust control material.

[0028] (1) mix tamarind gum and distilled water, adjust the water bath heating temperature to 70 DEG C, and heat and stir at a constant temperature of 300 r / min for 4 h to obtain a tamarind gum aqueous solution;

[0029] (2) add succinic acid to the tamarind gum aqueous solution, and adjust the pH value of the solution to 6; place the solution with the adjusted pH value in a magnetic stirring constant-temperature water bath kettle at 70 DEG C, stir at a speed of 300 r / min for 2 h, and obtain a modified solution I;

[0030] (3) add silk fibroin to a beaker containing distilled water, adjust the pH value to 6, and place the beaker in a magnetic stirring water bath kettle at 25 DEG C, stir at a speed of 300 r / min for 1 h, and centrifugally separate impurities to obtain a silk fibroin aqueous solution;

[0031] (4) add the silk fibroin aqueous solution to the modified solution I by using a separatory funnel, add a condensation reagent and a catalyst, raise the temperature of the water bath kettle to 40 DEG C, and stir at a speed of 300 r / min for 1 h to obtain a modified solution II;

[0032] (5) add a water-retaining agent and a wetting agent to the modified solution II, stir at room temperature until the agents are dissolved, and stir at a speed of 300 r / min to obtain the high-film-forming mist state dust control material.

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

[0034] The reaction equation of the application is as follows: (1)

[0036] (2)

[0038]

[0039] The reaction principle of the application is as follows:

[0040] (1) The hydrophilic group carboxyl in the biodegradable succinic acid is esterified with the hydroxyl in the succinic acid, one molecule of water is removed to form an ester bond (-COO-), which is modified on the main chain of tamarind gum to obtain carboxyl modified tamarind gum, which greatly improves the water solubility of tamarind gum and makes it better to improve the wettability of hydrophobic coal dust and improve the dust suppression efficiency.

[0041] (2) The carboxyl in the modified product I reacts with the amino in the natural degradable polymer silk fibroin (SF) under the action of catalyst N-hydroxysuccinimide and condensation reagent dicyclohexyl carbodiimide, the carboxyl (-COOH) loses one hydroxyl (-OH), the amino (-NH2) loses one hydrogen atom (H), and the two groups are combined together to crosslink, releasing one molecule of water, finally forming an amide bond (-CONH-), and further improving the film forming property and stability of the material.

[0042] The beneficial effects of the present application are,

[0043] (1) The tamarind gum selected in the present application has high viscosity, but too high viscosity will result in poor spray atomization effect, affecting the spray dust removal efficiency, and its molecular structure contains a large number of hydroxyl groups, therefore, succinic acid is added, the hydroxyl in tamarind gum reacts with the carboxyl in succinic acid, the carboxyl is connected on the main chain of tamarind gum, and the water solubility and viscosity characteristics of tamarind gum are improved by esterification.

[0044] (2) The silk fibroin itself has excellent film forming property and biodegradability, and the amino group can be combined with the modified product I, wherein the modified product I has a carboxyl group which can be chemically crosslinked with the amino in the silk fibroin to form an amide bond, thereby improving the film forming property of the modified product II, so that the dust suppression material has the characteristics of anti-impact and strong stability in harsh environment, preventing coal dust particles from escaping and causing secondary pollution.

[0045] (3) The high film forming property and wettability of the hydrophobic coal dust lifting dust suppression material has high film forming property and wettability, can better combine with the surface of coal seam to form a stable protective film, so as to more effectively fix coal dust particles, and by adding polyoxyethylene fatty alcohol ether, the hydrophilic group polyoxyethylene chain in the molecular structure can interact with water molecules, and the hydrophobic group fatty alcohol chain can interact with the solid surface. This dual effect makes polyoxyethylene fatty alcohol ether form a uniform film on the surface of coal dust, thereby further improving the wettability, and in combination with the excellent adhesion, it can more efficiently capture fine coal dust in the air, thereby effectively preventing the secondary flying of coal dust.

[0046] In conclusion, the high-film-forming fog-state dust suppression material for improving the wettability of hydrophobic coal dust prepared by the application has the advantages of good film-forming effect and wettability, high dust suppression efficiency and the like. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 is a film-forming effect test diagram;

[0048] Figure 2 is a process flow diagram of the preparation method of the high-film-forming fog-state dust suppression material for improving the wettability of hydrophobic coal dust. DETAILED DESCRIPTION

[0049] To make the purpose, technical scheme and advantages of the embodiments of the application clearer, the technical scheme in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are some embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the application. Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the application.

[0050] Example 1

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

[0052] (2) Add 0.2g of succinic acid to the tamarind gum aqueous solution and adjust the pH value of the solution to 6, and place the solution with adjusted pH value in a magnetic stirring constant-temperature water bath pot at 70℃, with a stirring speed of 300r / min, and stir for 2h to obtain a modified solution I;

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

[0054] (4) Increase the temperature of the water bath pot to 40℃, add the silk fibroin aqueous solution to the modified solution I, and add 0.3g of dicyclohexyl carbodiimide and 0.4g of N-hydroxysuccinimide, and stir for 1h at a stirring speed of 300r / min to obtain a modified solution II;

[0055] (5) To the modified solution II, 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether were added, and stirred at room temperature until dissolved, at a speed of 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) Distilled water was added to a beaker, and the water bath temperature was set to 70°C. 0.5 g of tamarind gum was dissolved in 100 mL of water, and stirred in the water bath at a speed of 300 r / min for 4 h until dissolved, to obtain a tamarind gum aqueous solution;

[0058] (2) 0.3 g of succinic acid was added to the tamarind gum aqueous solution, and the pH value of the solution was adjusted to 6. The solution after pH adjustment was placed in a magnetic stirring constant-temperature water bath at 60°C, at a speed of 300 r / min, and stirred for 2 h, to obtain a modified solution I;

[0059] (3) 0.4 g of silk fibroin was added to a beaker containing distilled water, and the pH value was adjusted to 6. It was placed in a magnetic stirring water bath at 25°C, at a speed of 300 r / min, and stirred for 1 h. The silk fibroin aqueous solution was separated by centrifugation;

[0060] (4) The temperature of the water bath was raised to 40°C, and the silk fibroin aqueous solution was added to the modified solution I, and 0.3 g of dicyclohexyl carbodiimide and 0.4 g of N-hydroxysuccinimide were added. Stirring was carried out at a speed of 300 r / min for 1 h, to obtain a modified solution II;

[0061] (5) To the modified solution II, 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether were added, and stirred at room temperature until dissolved, at a speed of 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) Distilled water was added to a beaker, and the water bath temperature was set to 70°C. 0.5 g of tamarind gum was dissolved in 100 mL of water, and stirred in the water bath at a speed of 300 r / min for 4 h until dissolved, to obtain a tamarind gum aqueous solution;

[0064] (2) 0.4 g of succinic acid was added to the tamarind gum aqueous solution, and the pH value of the solution was adjusted to 6. The solution after pH adjustment was placed in a magnetic stirring constant-temperature water bath at 50°C, at a speed of 300 r / min, and stirred for 2 h, to obtain a modified solution I;

[0065] (3) 0.3 g of silk fibroin was added to a beaker containing distilled water, the pH value was adjusted to 6, and it was placed in a magnetic stirring water bath at 25°C, with a stirring speed of 300 r / min, and stirred for 1 h. The silk fibroin aqueous solution was obtained by centrifugation;

[0066] (4) The temperature of the water bath was raised to 40°C, and the silk fibroin aqueous solution was added to the modified solution I, and 0.3 g of dicyclohexyl carbodiimide and 0.4 g of N-hydroxysuccinimide were added, and stirred for 1 h at a stirring speed of 300 r / min, to obtain modified solution II;

[0067] (5) 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether were added to the modified solution II, and stirred at room temperature until dissolved, at a stirring speed of 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) Distilled water was added to a beaker, and the water bath temperature was set to 70°C. 0.4 g of tamarind gum was dissolved in 100 mL of water, and stirred in a water bath at a stirring speed of 300 r / min for 4 h until dissolved, to obtain a tamarind gum aqueous solution;

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

[0071] (3) 0.5 g of silk fibroin was added to a beaker containing distilled water, the pH value was adjusted to 6, and it was placed in a magnetic stirring water bath at 25°C, with a stirring speed of 300 r / min, and stirred for 1 h. The silk fibroin aqueous solution was obtained by centrifugation;

[0072] (4) The temperature of the water bath was raised to 40°C, and the silk fibroin aqueous solution was added to the modified solution I, and 0.3 g of dicyclohexyl carbodiimide and 0.4 g of N-hydroxysuccinimide were added, and stirred for 1 h at a stirring speed of 300 r / min, to obtain modified solution II;

[0073] (5) 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether were added to the modified solution II, and stirred at room temperature until dissolved, at a stirring speed of 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) In a beaker, add distilled water, set the water bath temperature to 70°C, dissolve 0.4g of tamarind gum in 100mL of water, and stir in the water bath at a speed of 300r / min for 4h until dissolved, to obtain a tamarind gum aqueous solution;

[0076] (2) Add 0.3g of succinic acid to the tamarind gum aqueous solution and adjust the pH of the solution to 6, and place the solution with adjusted pH in a magnetic stirring constant temperature water bath at 70°C, with a stirring speed of 300r / min, and stir for 2h to obtain modified solution I;

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

[0078] (4) Increase the temperature of the water bath to 40°C, add the silk fibroin aqueous solution to the modified solution I solution, and add 0.3g of dicyclohexyl carbodiimide and 0.4g of N-hydroxysuccinimide, stir for 1h, and obtain modified solution II with a stirring speed of 300r / min;

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

[0080] Example 6

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

[0082] (2) Add 0.4g of succinic acid to the tamarind gum aqueous solution and adjust the pH of the solution to 6, and place the solution with adjusted pH in a magnetic stirring constant temperature water bath at 60°C, with a stirring speed of 300r / min, and stir for 2h to obtain modified solution I;

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

[0084] (4) Increase the temperature of the water bath to 40°C, add the silk fibroin aqueous solution to the modified solution I solution, and add 0.3g of dicyclohexyl carbodiimide and 0.4g of N-hydroxysuccinimide, stir for 1h, and obtain modified solution II with a stirring speed of 300r / min;

[0085] (5) To the modified solution II, 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether were added, and stirred at room temperature until dissolved, at a speed of 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) Distilled water was added to a beaker, and the water bath temperature was set to 70℃. 0.3 g of tamarind gum was dissolved in 100 mL of water, and stirred in the water bath at a speed of 300 r / min for 4 h until dissolved, to obtain a tamarind gum aqueous solution;

[0088] (2) 0.2 g of succinic acid was added to the tamarind gum aqueous solution, and the pH value of the solution was adjusted to 6. The solution after pH adjustment was placed in a magnetic stirring constant-temperature water bath at 60℃, at a speed of 300 r / min, and stirred for 2 h, to obtain a modified solution I;

[0089] (3) 0.5 g of silk fibroin was added to a beaker containing distilled water, and the pH value was adjusted to 6. It was placed in a magnetic stirring water bath at 25℃, at a speed of 300 r / min, and stirred for 1 h. The silk fibroin aqueous solution was separated by centrifugation;

[0090] (4) The temperature of the water bath was raised to 40℃, and the silk fibroin aqueous solution was added to the modified solution I, and 0.3 g of dicyclohexyl carbodiimide and 0.4 g of N-hydroxysuccinimide were added. It was stirred for 1 h at a speed of 300 r / min, to obtain a modified solution II;

[0091] (5) To the modified solution II, 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether were added, and stirred at room temperature until dissolved, at a speed of 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) Distilled water was added to a beaker, and the water bath temperature was set to 70℃. 0.3 g of tamarind gum was dissolved in 100 mL of water, and stirred in the water bath at a speed of 300 r / min for 4 h until dissolved, to obtain a tamarind gum aqueous solution;

[0094] (2) 0.3 g of succinic acid was added to the tamarind gum aqueous solution, and the pH value of the solution was adjusted to 6. The solution after pH adjustment was placed in a magnetic stirring constant-temperature water bath at 50℃, at a speed of 300 r / min, and stirred for 2 h, to obtain a modified solution I;

[0095] (3) 0.4 g of silk fibroin was added to a beaker containing distilled water, the pH value was adjusted to 6, and it was placed in a magnetic stirring water bath at 25°C, with a stirring speed of 300 r / min, and stirred for 1 h. The silk fibroin aqueous solution was obtained by centrifugation;

[0096] (4) The temperature of the water bath was raised to 40°C, and the silk fibroin aqueous solution was added to the modified solution I, and 0.3 g of dicyclohexyl carbodiimide and 0.4 g of N-hydroxysuccinimide were added, and stirred for 1 h at a stirring speed of 300 r / min, to obtain modified solution II;

[0097] (5) 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether were added to the modified solution II, and stirred at room temperature until dissolved, at a stirring speed of 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) Distilled water was added to a beaker, and the water bath temperature was set to 70°C. 0.3 g of tamarind gum was dissolved in 100 mL of water, and stirred in a water bath at a stirring speed of 300 r / min for 4 h until dissolved, to obtain a tamarind gum aqueous solution;

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

[0101] (3) 0.3 g of silk fibroin was added to a beaker containing distilled water, the pH value was adjusted to 6, and it was placed in a magnetic stirring water bath at 25°C, with a stirring speed of 300 r / min, and stirred for 1 h. The silk fibroin aqueous solution was obtained by centrifugation;

[0102] (4) The temperature of the water bath was raised to 40°C, and the silk fibroin aqueous solution was added to the modified solution I, and 0.3 g of dicyclohexyl carbodiimide and 0.4 g of N-hydroxysuccinimide were added, and stirred for 1 h at a stirring speed of 300 r / min, to obtain modified solution II;

[0103] (5) 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether were added to the modified solution II, and stirred at room temperature until dissolved, at a stirring speed of 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 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. The mixture was stirred at a speed of 300 r / min and room temperature until dissolved, to obtain the material for 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 film-forming effect test was conducted on 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 onto a coal pile. Samples treated with the dust suppression materials of Comparative Examples 1-2 served as a control group. The coal pile was then placed outdoors and, after drying, sprayed using a spray device to simulate outdoor rainfall. The spray duration was 5 minutes, the water volume was 25 mm, and the spray rate was 5 mm / min. After the test, the accumulated water in the petri dish was drained, and the dish was placed in a drying oven. The dried mass was measured, and the film-forming effect of the dust suppression material was determined by calculating the mass loss rate.

[0112]

[0113] In the formula, 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] Analysis of the results of Experiment 1 showed that compared with Comparative Examples 1-2, the mass loss rates of Examples 1-9 were all below 75%, with Example 5 having the lowest mass loss rate of 67.38%. This indicates that the dust suppression material of this invention has high film-forming properties and can effectively improve the erosion resistance of the coal seam surface. The sample of the spraying example achieved a maximum crust hardness of 83.76HA, far exceeding the film hardness of Comparative Examples 1-2, demonstrating excellent curing effect.

[0116] Test 2

[0117] The dust suppression materials prepared in Examples 1-9 and Comparative Examples 1-2 were subjected to wettability tests.

[0118] The test method was as follows: a tablet press was used at a certain working pressure to keep the coal sample under the pressure for 3 min to form a cylindrical sample with a diameter of 10 mm and a height of 6 mm, and with a flat and smooth surface. A Shanghai JC2000C1 contact angle measuring instrument was used to measure the contact angle 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, and the test results are shown in Table 1.

[0119] Table 1 Contact angle test

[0120]

[0121] As shown in Table 1, the contact angle of the dust suppression material prepared in Comparative Example 1-2 and the coal sample is greater than the contact angle of the dust suppression material prepared in Examples 1-9 and the coal sample, and the contact angle of Example 5 after 4 s is 16.30°, indicating that the wettability of the dust suppression material prepared in the application is significantly good. This is because the prepared dust suppression material contains a large number of polar hydrophilic groups, which can reduce the surface tension of water below the critical surface tension of solids, so that the dust suppression material has good wettability and can effectively suppress the flying of coal dust in time.

[0122] Test 3

[0123] The dust suppression materials prepared in Examples 1-9 and Comparative Examples 1-2 were subjected to spray dust suppression rate tests.

[0124] The test method was as follows: based on the wind flow-droplet-dust coupling experimental platform, 50 g of hydrophobic coal powder (5 s contact angle of 63.4°) was taken under the same wind speed condition, and a dust generator was used to emit 32 g / min of stable quantity to simulate the dust dispersion effect. The chemical dust suppression materials prepared in Examples 1-9 and Comparative Examples 1-2 were added to the spray aqueous solution, and a single cyclone atomizing nozzle was used to spray the dust suppression material aqueous solution at different spray pressures of 1-8 MPa on the dust in the wind flow-droplet-dust coupling experimental platform to settle the dust in the settling experimental platform. Then, a mine dust sampler was used to sample, weigh and obtain the dust concentration, and the spray dust suppression rate was calculated by measuring the concentration before and after spraying, i.e. (dust concentration before spraying-dust concentration after spraying) / dust concentration before spraying x 100%, and the test results are shown in Table 2.

[0125] Table 2 Dust suppression efficiency test

[0126]

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

[0128] In summary, the dust suppression material prepared by the present application can effectively suppress dust, effectively solve the technical problems of poor wettability of hydrophobic coal dust, poor film forming property of dust suppression material, general dust fall rate and dust suppression rate, and has a broad market prospect.

[0129] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Of course, the present application is not limited to the above examples, and those skilled in the art can still modify, replace, add or replace the foregoing technical solutions without departing from the scope of the embodiments of the present application, which also belongs to the protection scope.

[0130] Of course, the above description is not a limitation of the present application, and the present application is not limited to the above examples. Changes, modifications, additions or replacements made by those skilled in the art within the scope of the present application should also belong to the protection scope of the present application.

Claims

1. A high film-forming dust suppressing material in the form of a mist for improving the wettability of hydrophobic coal dust, characterized by, The preparation method is as follows: (1) distilled water is added to a beaker, the water bath temperature is set to 70 DEG C, 0.4g of tamarind gum is dissolved in 100mL of water, and stirring is carried out in the water bath at a speed of 300r / min for 4h until dissolution, to obtain a tamarind gum aqueous solution; (2) 0.3g of succinic acid is added to the tamarind gum aqueous solution, and the pH value of the solution is adjusted to 6, and the solution after pH value adjustment is placed in a magnetic stirring constant temperature water bath at 70 DEG C, the stirring speed is 300r / min, and stirring is carried out for 2h, to obtain modified solution I; (3) 0.4g of silk fibroin is added to the beaker containing distilled water, the pH value is adjusted to 6, and it is placed in a magnetic stirring water bath at 25 DEG C, the stirring speed is 300r / min, and stirring is carried out for 1h, and the silk fibroin aqueous solution is obtained by centrifugation; (4) the temperature of the water bath is raised to 40 DEG C, the silk fibroin aqueous solution is added to the modified solution I solution, and 0.3g of dicyclohexyl carbodiimide and 0.4g of N-hydroxysuccinimide are added, stirring is carried out for 1h, the stirring speed is 300r / min, and modified solution II is obtained; (5) 0.4g of glycerol and 0.8g of polyoxyethylene fatty alcohol ether are added to the modified solution II, stirring is carried out at room temperature until dissolution, the stirring speed is 300r / min, and finally the dust suppression material is obtained.

2. A high film-forming dust suppressing material in the form of mist for improving wettability of hydrophobic coal dust, characterized by, The preparation method is as follows: (1) distilled water is added to a beaker, the water bath temperature is set to 70 DEG C, 0.4g of tamarind gum is dissolved in 100mL of water, and stirring is carried out in the water bath at a speed of 300r / min for 4h until dissolution, to obtain a tamarind gum aqueous solution; (2) 0.3g of succinic acid is added to the tamarind gum aqueous solution, and the pH value of the solution is adjusted to 6, and the solution after pH value adjustment is placed in a magnetic stirring constant temperature water bath at 70 DEG C, the stirring speed is 300r / min, and stirring is carried out for 2h, to obtain modified solution I; (3) 0.4g of silk fibroin is added to the beaker containing distilled water, the pH value is adjusted to 6, and it is placed in a magnetic stirring water bath at 25 DEG C, the stirring speed is 300r / min, and stirring is carried out for 1h, and the silk fibroin aqueous solution is obtained by centrifugation; (4) the temperature of the water bath is raised to 40 DEG C, the silk fibroin aqueous solution is added to the modified solution I solution, and 0.3g of dicyclohexyl carbodiimide and 0.4g of N-hydroxysuccinimide are added, stirring is carried out for 1h, the stirring speed is 300r / min, and modified solution II is obtained; (5) 0.4g of glycerol and 0.8g of polyoxyethylene fatty alcohol ether are added to the modified solution II, stirring is carried out at room temperature until dissolution, the stirring speed is 300r / min, and finally the dust suppression material is obtained.

3. A high film-forming dust suppressing material in the form of mist for improving wettability of hydrophobic coal dust, characterized by, The preparation method is as follows: (1) distilled water is added to a beaker, the water bath temperature is set to 70 DEG C, 0.4g of tamarind gum is dissolved in 100mL of water, and stirring is carried out in the water bath at a speed of 300r / min for 4h until dissolution, to obtain a tamarind gum aqueous solution; (2) 0.3g of succinic acid is added to the tamarind gum aqueous solution, and the pH value of the solution is adjusted to 6, and the solution after pH value adjustment is placed in a magnetic stirring constant temperature water bath at 70 DEG C, the stirring speed is 300r / min, and stirring is carried out for 2h, to obtain modified solution I; (3) 0.4g of silk fibroin is added to the beaker containing distilled water, the pH value is adjusted to 6, and it is placed in a magnetic stirring water bath at 25 DEG C, the stirring speed is 300r / min, and stirring is carried out for 1h, and the silk fibroin aqueous solution is obtained by centrifugation; (4) the temperature of the water bath is raised to 40 DEG C, the silk fibroin aqueous solution is added to the modified solution I solution, and 0.3g of dicyclohexyl carbodiimide and 0.4g of N-hydroxysuccinimide are added, stirring is carried out for 1h, the stirring speed is 300r / min, and modified solution II is obtained; (5) 0.4g of glycerol and 0.8g of polyoxyethylene fatty alcohol ether are added to the modified solution II, stirring is carried out at room temperature until dissolution, the stirring speed is 300r / min, and finally the dust suppression material is obtained. (3) 0.5 g of silk fibroin was added into a beaker containing distilled water, the pH value was adjusted to 6, and the beaker was placed in a magnetic stirring water bath at 25 °C with a stirring speed of 300 r / min for 1 h. The silk fibroin aqueous solution was obtained by centrifugation; (4) The temperature of the water bath was increased to 40 °C, and the silk fibroin aqueous solution, 0.3 g of dicyclohexyl carbodiimide and 0.4 g of N-hydroxysuccinimide were added into the modified solution I, and stirred at a speed of 300 r / min for 1 h to obtain the modified solution II; (5) 0.4 g of glycerol and 0.8 g of polyoxyethylene fatty alcohol ether were added into the modified solution II, and stirred at room temperature until dissolved at a speed of 300 r / min to obtain the dust suppression material.

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