CN114738039A - Preparation method of polydopamine-coated mixed powder modified explosion suppression material - Google Patents
Preparation method of polydopamine-coated mixed powder modified explosion suppression material Download PDFInfo
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- CN114738039A CN114738039A CN202210410734.1A CN202210410734A CN114738039A CN 114738039 A CN114738039 A CN 114738039A CN 202210410734 A CN202210410734 A CN 202210410734A CN 114738039 A CN114738039 A CN 114738039A
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- calcium carbonate
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- silicon dioxide
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- 238000004880 explosion Methods 0.000 title claims abstract description 103
- 230000001629 suppression Effects 0.000 title claims abstract description 71
- 229920001690 polydopamine Polymers 0.000 title claims abstract description 59
- 239000000463 material Substances 0.000 title claims abstract description 54
- 239000011812 mixed powder Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 84
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 74
- 239000000843 powder Substances 0.000 claims abstract description 50
- 239000000243 solution Substances 0.000 claims abstract description 41
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 37
- 238000001035 drying Methods 0.000 claims abstract description 24
- 238000003756 stirring Methods 0.000 claims abstract description 22
- 239000007853 buffer solution Substances 0.000 claims abstract description 20
- -1 silicon dioxide-calcium carbonate-hydrochloric acid Chemical compound 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 18
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 15
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- CTENFNNZBMHDDG-UHFFFAOYSA-N Dopamine hydrochloride Chemical compound Cl.NCCC1=CC=C(O)C(O)=C1 CTENFNNZBMHDDG-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 229960001149 dopamine hydrochloride Drugs 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000003054 catalyst Substances 0.000 claims abstract description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 39
- 235000012239 silicon dioxide Nutrition 0.000 claims description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 238000000746 purification Methods 0.000 claims description 16
- 239000007787 solid Substances 0.000 claims description 15
- 239000000725 suspension Substances 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- FDEQQCOTLPPCAO-UHFFFAOYSA-N Cl.OC(O)=O Chemical compound Cl.OC(O)=O FDEQQCOTLPPCAO-UHFFFAOYSA-N 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 34
- 230000007246 mechanism Effects 0.000 abstract description 3
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 description 14
- 239000000203 mixture Substances 0.000 description 11
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- 238000010521 absorption reaction Methods 0.000 description 3
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical compound OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
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- 230000001360 synchronised effect Effects 0.000 description 2
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- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 201000010001 Silicosis Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
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- 239000008366 buffered solution Substances 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
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- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000002085 irritant Substances 0.000 description 1
- 231100000021 irritant Toxicity 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
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- 239000003595 mist Substances 0.000 description 1
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- 231100000572 poisoning Toxicity 0.000 description 1
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- 230000009257 reactivity Effects 0.000 description 1
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- 230000002195 synergetic effect Effects 0.000 description 1
- 238000001757 thermogravimetry curve Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/08—Rock dusting of mines; Depositing other protective substances
- E21F5/12—Composition of rock dust
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention belongs to the technical field of explosion suppression materials, and relates to a preparation method of a polydopamine coated mixed powder modified explosion suppression material. The method comprises the following steps: (1) dispersing the purified silicon dioxide powder and calcium carbonate powder in water, and adding a hydrochloric acid solution to prepare a silicon dioxide-calcium carbonate-hydrochloric acid solution; (2) slowly adding a buffer solution into the silicon dioxide-calcium carbonate-hydrochloric acid solution prepared in the step (1) under the condition of constant-temperature stirring, then adding dopamine hydrochloride powder, adding an ammonia water catalyst under the condition of stirring, controlling the pH value of the system to be 8-9, heating, stirring, reacting for 12-15 hours at the reaction temperature of 24-30 ℃, and purifying and drying after the reaction is finished to obtain the polydopamine coated mixed powder modified explosion suppression material. The explosion suppression effect of the polydopamine coated mixed powder modified explosion suppression material on methane is highly matched with the explosion mechanism and the course, so that the polydopamine coated mixed powder modified explosion suppression material has a good explosion suppression effect.
Description
Technical Field
The invention belongs to the technical field of explosion suppression materials, and particularly relates to a preparation method of a polydopamine coated mixed powder modified explosion suppression material.
Background
With the development of social economy, industrial production develops faster and faster. In the modern industrial production life, gas in a coal mine reaches a certain high temperature or an open fire can generate a sharp explosion reaction. Methane is a very common and widely used fuel. However, the flammable and explosive properties of methane not only cause economic loss but also endanger the personal safety of workers because of adding difficulty to coal mining work and natural gas transportation work, which is contrary to the safety production policy of China, so the methane explosion suppression problem is very important.
The core of explosion suppression is the explosion suppressor, and the explosion suppressor usually selected by students mainly comprises inert gas, powder, fine water mist and the like. These suppressants have advantages and disadvantages in different seasons. Compared with other explosion suppressants, the powder is simple and easy to obtain, convenient to store and good in explosion suppression performance. Powder explosion suppression mainly utilizes flame generated by explosion extinguishing, so that the effect of suppressing explosion is achieved. The silicon dioxide and the calcium carbonate have excellent thermal stability, are non-volatile, do not generate irritant harmful gases, and have good explosion suppression performance and high melting point. But the compatibility of the two is poor, the processing is relatively difficult, and when the silicon dioxide powder particles are too fine, people can suffer from silicosis after long-term inhalation. Not only silica and calcium carbonate, but also all monomeric suppressants have more or less certain limitations in suppressing methane explosion, and cannot meet the required functions in actual working conditions.
Disclosure of Invention
In order to solve the problems of the related technical layers, the invention discloses a preparation method of a polydopamine coated mixed powder modified explosion suppression material.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of a polydopamine coated mixed powder modified explosion suppression material comprises the following steps:
(1) dispersing the purified silicon dioxide powder and calcium carbonate powder in water, and adding a hydrochloric acid solution to prepare a silicon dioxide-calcium carbonate-hydrochloric acid solution.
Further, the concentration of the hydrochloric acid solution was 0.1M, the amount of hydrochloric acid was 5ml/g of silica powder, and the mass ratio of silica powder to calcium carbonate powder was 1: 1.
Further, the preparation conditions of the silica-calcium carbonate-hydrochloric acid solution in the step (1) are as follows: stirring for 1-2 h at 40-50 ℃.
Furthermore, the particle size range of the silicon dioxide powder and the calcium carbonate powder is 8-20 microns.
(2) Slowly adding a buffer solution into the silicon dioxide-calcium carbonate-hydrochloric acid solution prepared in the step (1) under the condition of constant-temperature stirring, then adding dopamine hydrochloride powder, adding an ammonia water catalyst under the condition of stirring, controlling the pH value of the system to be 8-9, heating and stirring for reaction for 12-15 hours, controlling the reaction temperature to be 24-30 ℃, purifying and drying after the reaction is finished, and obtaining the polydopamine coated mixed powder modified explosion suppression material, wherein the buffer solution is an aqueous solution of tris (hydroxymethyl) aminomethane, the concentration of ammonia water is 0.02mol/L, and the amount of ammonia water in every 1-4 g of dopamine hydrochloride is 20 ml. The coating of the polydopamine on the surface of the powder is facilitated under the alkalescent condition, and the action of adding the ammonia water is to promote the polymerization of the dopamine hydrochloride into the polydopamine and coat the silicon dioxide and calcium carbonate mixed powder, so that the coating effect is better. The tris (hydroxymethyl) aminomethane is used for allowing the coated object to be coated in a weak alkaline environment (hydrochloric acid added in advance can prevent the pH from being too high), so that the coated object can be coated more easily in the weak alkaline environment, and further, the pH value in the step (2) is 8.5.
Further, the mass ratio of the dopamine hydrochloride, the silicon dioxide and the calcium carbonate in the step (2) is 1-4: 1: 1.
further, the purification and drying method in the step (2) comprises the following steps: and after the reaction is finished, centrifugally separating out solids, washing the solids with deionized water until the pH value is 7, drying the solids at a high temperature of 70 ℃ under a vacuum condition, introducing nitrogen for purification, and standing the solids for 0.5 to 1 hour.
Preferably, the method for purifying silica powder or calcium carbonate powder in step (1) comprises the following steps: drying solid silicon dioxide or calcium carbonate, sieving with a 240-mesh sieve, taking substances below the sieve to prepare silicon dioxide suspension or calcium carbonate suspension, introducing nitrogen for purification, standing for 1 hour, centrifuging to remove waste residues, extracting solid substances on the upper layer of the suspension, drying, and grinding into superfine powder by using a ball mill respectively and independently, thereby respectively obtaining purified silicon dioxide and calcium carbonate powder.
Furthermore, the high-temperature drying condition in the purification method in the step (1) is drying by using an air-blast drying oven at the temperature of 60-70 ℃ for 12-24 h.
Furthermore, the grinding aid in the purification method in the step (1) is industrial grade talcum powder.
Furthermore, the mass ratio of the total mass of the silicon dioxide and calcium carbonate powder to the spheres of the planetary ball mill in the purification method in the step (1) is 1: 3.
The polydopamine-coated mixed powder modified explosion suppression material prepared by the method also contains a small amount of silicate and carbonate, and can play an explosion suppression role.
Finally, the invention discloses application of the polydopamine coated mixed powder modified explosion suppression material in the fields of mining engineering and natural gas transportation.
The polydopamine-coated mixed powder modified explosion suppression material has the first characteristics that: when an explosion occurs, the modified explosion suppression material faces the shock wave. The modified explosion suppression material shell polydopamine reacts, the powder is coated with a layer of polydopamine, the biological activity of the powder can be improved, and strong acting force can be formed by the polydopamine and methane molecules through covalent bonds and non-covalent bonds, so that the absorption effect is achieved. Hydrogen ions generated by explosion are connected through abundant functional bonds, so that the explosion is weakened. The water absorption of the polydopamine enables the polydopamine to absorb moisture in air, and when the polydopamine is evaporated into water vapor to absorb heat in the presence of open fire, the temperature of the flame of the precursor can be reduced to be below the ignition point, and meanwhile, the generated water vapor can reduce the concentration of methane, so that the power of explosion is weakened.
The second characteristic of the polydopamine-coated mixed powder modified explosion suppression material is as follows: the polydopamine contains a large amount of catechol and amino groups which can react with functional groups such as hydroxyl, amino, carboxyl and the like to prepare a multifunctional layer. The first function of these groups is to bind active free radicals generated during explosion, so as to force the number of active free radicals in unit space to decrease, thus reducing the reactivity of chain reaction and finally breaking the reaction chain. The second function of the groups is to eliminate the harmfulness of harmful gases, thereby avoiding the poisoning phenomenon caused by breathing harmful gases of people and enhancing the safety, environmental protection and greenness of the pipeline environment. Dopamine as a modifier has been widely used in various fields in recent years. The poly-dopamine is covered on the surface of the mixed powder of the silicon dioxide and the calcium carbonate by a DA in-situ self-polymerization method, so that the explosion suppression of the silicon dioxide and the explosion suppression of the calcium carbonate can be realized, the dopamine structure contains an explosion suppression element nitrogen element, and the synergistic explosion suppression of the silicon dioxide-calcium carbonate-nitrogen is realized, so that the methane explosion is suppressed in a triple manner.
The third characteristic of the polydopamine-coated mixed powder modified explosion suppression material is as follows: the method coats polydopamine on the surfaces of silicon dioxide and calcium carbonate, so that the heat absorption amount of the explosion suppression powder material in the process of explosion is enhanced, the specific surface area of the explosion suppression powder material and the dispersity of the explosion suppression powder material in a pipeline space are improved, the contact probability of the explosion suppression powder material and active free radicals in explosion is increased, the contact area of the explosion suppression powder material and flames and shock waves in explosion is increased, and finally methane explosion is suppressed to a greater extent. And the explosion suppression powder material sinking to the bottom of the pipeline can be impacted by explosion shock waves generated by explosion to take off and can inhibit next explosion again, so that the harm caused by secondary explosion is reduced.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides a polydopamine-coated mixed powder modified explosion suppression material, and a preparation method and application thereof, wherein the polydopamine-coated mixed powder modified explosion suppression material is simple to operate, wide in material source and low in cost. The explosion suppression powder material can suppress explosion of silicon dioxide and calcium carbonate, and also contains an explosion suppression element nitrogen element on a dopamine structure, and the silicon dioxide-calcium carbonate-nitrogen is cooperated to suppress explosion. The compatibility of the silicon dioxide and the silicon dioxide is improved so as to ensure the mechanical property of the silicon dioxide. And the redundant powder of the residual silicon dioxide can be effectively absorbed, so that the silicon dioxide is prevented from harming the human body.
(2) The explosion suppression effect of the polydopamine coated mixed powder modified explosion suppression material on methane is highly matched with the explosion mechanism and the course, so that the polydopamine coated mixed powder modified explosion suppression material has a good explosion suppression effect.
Drawings
In order to make the purpose, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
fig. 1 is a scanning electron microscope image of 500 times magnification of the modified explosion suppression material of polydopamine coated mixed powder prepared in example 4.
Fig. 2 is a scanning electron microscope image of 1000 times magnification of the modified explosion suppression material of polydopamine coated mixed powder prepared in example 4.
Fig. 3 is a thermogram of the modified explosion suppression material coated with polydopamine mixed powder prepared in example 4.
Fig. 4 is a particle size diagram of the modified explosion suppression material coated with polydopamine in example 4.
FIG. 5 is a comparison graph of pressure change curves of the polydopamine coated mixed powder modified explosion suppression material and uncoated powder prepared in the example in the 9.5% methane explosion process.
FIG. 6 is a comparison of the positions of the flame fronts of the modified explosion suppression material coated with polydopamine powder and uncoated powder prepared in the example and at the same time in the case of pure methane.
FIG. 7 is a comparison of flame speed for the polydopamine coated mixed powder modified explosion suppression material prepared in example 4 and uncoated powder and in the case of pure methane.
Detailed Description
As can be known from the foregoing, some explosion suppression mechanisms disclosed in the prior art for modifying explosion suppression materials are not matched with the explosion process, so that explosion cannot be effectively suppressed, the utilization rate of the materials is too low, resources are wasted, and an application approach needs to be solved. Therefore, the invention provides a polydopamine coated mixed powder modified explosion suppression material, and a preparation method and application thereof. The present invention will be described in more detail with reference to specific embodiments. The ratio of the total mass of silica and calcium carbonate in the planetary ball mill to the mass of the grinding spheres in the following examples was 1: 3.
Example 1
A preparation method of a polydopamine coated mixed powder modified explosion suppression material comprises the following operation steps:
step 1: separate purification of silica and calcium carbonate particles
(1) The solid silica and the calcium carbonate are respectively dried by using an air-blast drying oven and dried for 12 hours at the temperature of 70 ℃. Sieving with a 240-mesh sieve, taking substances below the sieve, adding a proper amount of distilled water to prepare a silicon dioxide suspension and a calcium carbonate suspension, introducing nitrogen into the silicon dioxide suspension and the calcium carbonate suspension for purification, standing for 0.5-1 hour, centrifuging the silicon dioxide suspension and the calcium carbonate suspension, removing waste residues, respectively extracting solid substances on the upper layers of the two suspensions, drying the solid substances at the high temperature of 70 ℃ for 12 hours, respectively adding a proper amount of talcum powder into a ball mill to help grinding the talcum powder into superfine powder for 8 hours, and thus obtaining the purified silicon dioxide and calcium carbonate.
And 2, step: preparing silicon dioxide-calcium carbonate-hydrochloric acid solution
Respectively adding 0.2g of purified silicon dioxide and 0.2g of calcium carbonate obtained in the step 1 into water, then adding 1ml of hydrochloric acid solution (0.1M), and stirring for 1-2 h at 40-50 ℃ to obtain 200ml of silicon dioxide-calcium carbonate-hydrochloric acid solution.
And step 3: preparing a buffer solution
2g of TRIS were taken and placed in a beaker to obtain 40ml of a buffered solution of dopamine solution. And 4, step 4: polydopamine coated mixed powder
Slowly adding the buffer solution obtained in the step 3 into the silicon dioxide-calcium carbonate-hydrochloric acid solution obtained in the step 2, continuously adding the buffer solution until the pH value is adjusted to about 8.5 under the condition of constant temperature and stirring, then adding 0.2g of dopamine hydrochloride powder, adding 4ml of ammonia water (0.02M) under the condition of stirring, wherein the ammonia water has the function of accelerating the speed of covering the mixed powder of the silicon dioxide and the calcium carbonate by the polydopamine so as to achieve better covering effect, slightly reducing the pH value after adding the dopamine hydrochloride, adding the ammonia water to neutralize the pH value, placing the mixture into a magnetic stirrer under the water bath heating condition of 30 ℃, stirring the mixture for 12 hours, centrifuging the mixture under the condition of 3000r/min, standing the mixture for 12 hours, washing the mixture with deionized water to the pH value of 7, drying the mixture for 12 hours at high temperature of 70 ℃ under the vacuum condition, introducing nitrogen to purify the mixture, standing for 0.5 to 1 hour, and drying to obtain polydopamine coated mixed powder.
Example 2
A preparation method of a polydopamine coated mixed powder modified explosion suppression material comprises the following operation steps:
step 1: purification of silica and calcium carbonate particles separately
(1) The purification procedure was the same as in 1 of example 1.
Step 2: preparing silicon dioxide-calcium carbonate-hydrochloric acid solution
Same as in step 2 of example 1. And step 3: preparing a buffer solution
An appropriate amount of TRIS was taken and placed in a beaker to obtain a buffer solution for preparing a dopamine solution (same as in step 3 of example 1).
And 4, step 4: polydopamine coated mixed powder
And (3) slowly adding the buffer solution in the step (3) into the silicon dioxide-calcium carbonate-hydrochloric acid solution in the step (2), continuously adding the buffer solution until the pH value is about 8.5 under the condition of constant temperature and stirring, then adding 0.4g of dopamine hydrochloride powder, adding 4ml of ammonia water (0.02M) under the condition of stirring, placing the mixture into a magnetic stirrer to be stirred for 13 hours under the water bath heating condition of 30 ℃, centrifuging the mixture under the condition of 3000r/min, standing the solution for 12 hours, washing the solution with deionized water until the pH value is 7, drying the solution at a high temperature of 70 ℃ for 12 hours under the vacuum condition, introducing nitrogen to purify the solution, standing the solution for 0.5 to 1 hour, and drying the solution to obtain the polydopamine coated mixed powder.
Example 3
A preparation method of a polydopamine coated mixed powder modified explosion suppression material comprises the following operation steps:
step 1: separate purification of silica and calcium carbonate particles
(1) Same as in step 1 of example 1.
Step 2: preparing silicon dioxide-calcium carbonate-hydrochloric acid solution
Same as in step 2 of example 1.
And step 3: preparing a buffer solution
2g of TRIS (hydroxymethyl) aminomethane (TRIS) was taken and placed in a beaker to prepare 40ml of a buffer solution of dopamine solution. And 4, step 4: polydopamine coated mixed powder
And (3) slowly adding the buffer solution obtained in the step (3) into the silicon dioxide-calcium carbonate-hydrochloric acid solution obtained in the step (2), continuously adding the buffer solution until the pH value is adjusted to about 8.5 under the condition of constant temperature and stirring, optionally adding a small amount of ammonia water (0.02M) to play a role in catalyzing and adjusting the pH value, then adding 0.6g of dopamine hydrochloride powder, adding 4nl of ammonia water (0.02M) again under the stirring condition, stirring in a magnetic stirrer for 14h under the water bath heating condition of 30 ℃, centrifuging under the condition of 3000r/min, standing the solution for 12h, washing with deionized water until the pH value is 7, drying at high temperature of 70 ℃ for 12h under the vacuum condition, introducing nitrogen for purifying, standing for 0.5-1 h, and drying to obtain the polydopamine-coated mixed powder.
Example 4
A preparation method of a polydopamine coated mixed powder modified explosion suppression material comprises the following operation steps:
step 1: separate purification of silica and calcium carbonate particles
(1) Same as in step 1 of example 1.
Step 2: preparing silicon dioxide-calcium carbonate-hydrochloric acid solution
Same as in step 2 of example 1.
And step 3: preparing a buffer solution
2g of TRIS (hydroxymethyl) aminomethane (TRIS) was taken and placed in a beaker to prepare 40ml of a buffer solution of dopamine solution.
And 4, step 4: polydopamine coated mixed powder
And (3) slowly adding the buffer solution in the step (3) into the silicon dioxide-calcium carbonate-hydrochloric acid solution in the step (2), continuously adding the buffer solution until the pH value is about 8.5 under the condition of constant temperature and stirring, then adding 0.8g of dopamine hydrochloride powder, adding 4ml of ammonia water (0.02M) under the condition of stirring, placing the mixture into a magnetic stirrer to be stirred for 15 hours under the water bath heating condition of 30 ℃, centrifuging the mixture under the condition of 3000r/min, standing the solution for 12 hours, washing the solution with deionized water until the pH value is 7, drying the solution at a high temperature of 70 ℃ for 12 hours under the vacuum condition, introducing nitrogen to purify the solution, standing the solution for 0.5 to 1 hour, and drying the solution to obtain the polydopamine coated mixed powder.
In the embodiment, a methane explosion suppression experiment platform is adopted to test the explosion suppression performance of the explosion suppression material, and the methane explosion suppression experiment platform comprises an explosion pipeline (50 multiplied by 1000 mm, the length-diameter ratio is 20), an explosion pressure signal collecting system, a gas conveying system, an automatic powder spraying system, a high-speed camera system, a synchronous control system, a ventilation cleaning system, an ignition system and the like. The specific method comprises the following steps: and (3) opening a switch of the synchronous control system, firstly starting the operation of the gas conveying system, uniformly introducing mixed gas into the pipeline, then starting the operation of the powder spraying system, slowly introducing proper amount of powder to fill the whole pipeline, automatically starting the explosion pressure signal collecting system and the high-speed photographing system after the introduction of the gas and the powder is finished, and automatically starting the ignition system after waiting for 0.5 second. The explosion pressure signal collection system and the high-speed photography system simultaneously record pressure data and image data of flame shock waves in the whole experimental process, and the test results are shown in table 1 and fig. 5.
TABLE 1
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and their concepts should be equivalent or changed within the technical scope of the present invention.
Claims (7)
1. A preparation method of a polydopamine coated mixed powder modified explosion suppression material is characterized by comprising the following steps:
(1) dispersing the purified silicon dioxide powder and calcium carbonate powder in water, and adding a hydrochloric acid solution to prepare a silicon dioxide-calcium carbonate-hydrochloric acid solution;
(2) slowly adding a buffer solution into the silicon dioxide-calcium carbonate-hydrochloric acid solution prepared in the step (1) under the condition of constant-temperature stirring, then adding dopamine hydrochloride powder, adding an ammonia water catalyst under the condition of stirring, controlling the pH value of the system to be 8-9, heating and stirring for reaction for 12-15 hours, controlling the reaction temperature to be 24-30 ℃, purifying and drying after the reaction is finished, and obtaining the polydopamine coated mixed powder modified explosion suppression material, wherein the buffer solution is an aqueous solution of tris (hydroxymethyl) aminomethane, the concentration of ammonia water is 0.02mol/L, and the ammonia water dosage is 20ml in every 1-4 g of dopamine hydrochloride.
2. The preparation method of the polydopamine coated mixed powder modified explosion suppression material as claimed in claim 1, wherein the concentration of the hydrochloric acid solution is 0.1M, the amount of hydrochloric acid is 5ml/g of silica powder, and the mass ratio of the silica powder to the calcium carbonate powder is 1: 1.
3. The preparation method of the polydopamine coated mixed powder modified explosion suppression material according to claim 1, wherein the preparation conditions of the silica-calcium carbonate-hydrochloric acid solution in the step (1) are as follows: stirring for 1-2 h at 40-50 ℃.
4. The preparation method of the polydopamine-coated mixed powder modified explosion suppression material as claimed in claim 1, wherein the particle size range of the silicon dioxide powder and the calcium carbonate powder is 8-20 microns.
5. The preparation method of the polydopamine-coated mixed powder modified explosion suppression material according to claim 1, wherein the mass ratio of the dopamine hydrochloride, the silicon dioxide and the calcium carbonate in the step (2) is 1-4: 1: 1.
6. The preparation method of the polydopamine coated mixed powder modified explosion suppression material according to claim 1, wherein the purification and drying method in the step (2) comprises the following steps: and after the reaction is finished, centrifugally separating out solids, washing the solids by using deionized water until the pH value is 7, drying the solids at a high temperature of 70 ℃ under a vacuum condition, introducing nitrogen for purification, and standing the solids for 0.5 to 1 hour.
7. The preparation method of the polydopamine-coated mixed powder modified explosion suppression material as claimed in claim 1, wherein the purification method of the silica powder or calcium carbonate powder in the step (1) comprises the following steps:
drying solid silicon dioxide or calcium carbonate, sieving with a 240-mesh sieve, taking substances below the sieve to prepare silicon dioxide suspension or calcium carbonate suspension, introducing nitrogen for purification, standing for 1 hour, centrifuging to remove waste residues, extracting solid substances on the upper layer of the suspension, drying, and grinding into superfine powder by using a ball mill respectively and independently, thereby respectively obtaining purified silicon dioxide and calcium carbonate powder.
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