Small-diameter large-flow microporous chemical oxidant column and preparation method thereof

Abstract

This invention discloses a small-diameter, high-flow-rate microporous chemical oxygen generator and its preparation method, relating to the field of chemical oxygen generator technology. The small-diameter, high-flow-rate microporous chemical oxygen generator comprises an ignition propellant and an oxygen-generating propellant. The oxygen-generating propellant has a pit for holding the ignition propellant. The raw materials of the oxygen-generating propellant, by mass percentage, include: sodium chlorate 55%–75%, catalyst 4%–10%, chlorine inhibitor 2%–8%, metal powder 4%–10%, pore-forming component 5%–20%, kaolin 4%–10%, and water 0.5%–2%, wherein the pore-forming component includes at least one of ammonium carbonate and ammonium bicarbonate. This invention increases the combustion surface of the oxygen-generating propellant by forming micropores on its surface and inside, achieving a large flow rate of oxygen within a limited volume. Furthermore, operators can determine whether the propellant is completely dried by observing the presence or absence of odor during the drying process, thereby ensuring product uniformity and the purity of subsequent oxygen.

Description

Technical Field

[0001] This invention relates to the field of chemical oxygen generator technology, and more specifically, to a small-diameter, high-flow-rate microporous chemical oxygen propellant column and its preparation method. Background Technology

[0002] Chemical oxygen generators are used in emergency rescue applications where, given limited space, a large flow rate of oxygen is required. The oxygen production rate of an oxygen candle, or oxygen flow rate, depends on the combustion rate of the fuel mixture, the content of the oxygen-producing substances, the combustion surface area, and the ambient temperature. Typically, the fuel mixture of an oxygen candle mainly consists of sodium chlorate, a small amount of metal powder, and metal oxides. However, current chemical oxygen generators have relatively low combustion surface area and flow rate, and these cannot be adjusted.

[0003] In view of this, the present invention is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a small-diameter, high-flow-rate microporous chemical oxygen delivery column and its preparation method.

[0005] This invention is implemented as follows:

[0006] In a first aspect, the present invention provides a small-diameter, high-flow-rate microporous chemical oxygen propellant column, comprising an igniter and an oxygen-generating column. The oxygen-generating column is provided with a propellant pit, and the igniter is disposed in the propellant pit. The raw materials of the oxygen-generating column, by mass percentage, include: 55%–75% sodium chlorate, 4%–10% catalyst, 2%–8% chlorine inhibitor, 4%–10% metal powder, 5%–20% pore-forming component, 4%–10% kaolin, and 0.5%–2% water. The pore-forming component includes at least one of ammonium carbonate and ammonium bicarbonate.

[0007] In an optional embodiment, the raw material of the oxygen-generating column further includes 0.5% to 2% sodium silicate by mass percentage.

[0008] In an optional embodiment, the particle size of the pore-forming component is less than 100 mesh.

[0009] In an optional embodiment, the pit is located at the top of the oxygen-generating column, and the oxygen-generating column has at least three different proportions of the raw materials distributed along the direction from top to bottom. The portion of the raw materials near the pit has a higher content of the pore-forming component and the kaolin than the portion away from the pit.

[0010] Preferably, the contents of the pore-forming component and the kaolin decrease in a gradient from the top to the bottom, with each gradient of the pore-forming component decreasing by 2%-4% and each gradient of the kaolin decreasing by 1%-3%, and the reduced contents are supplemented by a corresponding amount of sodium chlorate.

[0011] In an optional embodiment, the height of the oxygen-generating column is 100-120mm, the top diameter of the oxygen-generating column is 32-36mm, the bottom diameter is 30-34mm, and the top diameter is larger than the bottom diameter; the diameter of the crater is 20-24mm, and the depth of the crater is 8-12mm.

[0012] In an optional embodiment, the catalyst includes at least one of cobalt hydroxide powder, cobalt oxide powder, cobalt chloride, and manganese dioxide;

[0013] Preferably, the chlorine inhibitor comprises at least one of barium peroxide powder, sodium peroxide, and potassium superoxide;

[0014] Preferably, the metal powder is at least one of iron powder, titanium powder, and aluminum powder.

[0015] Secondly, the present invention provides a method for preparing a small-diameter, high-flow-rate microporous chemical oxygen delivery column as described in any of the foregoing embodiments, comprising:

[0016] After the raw materials are mixed evenly, they are placed in a mold and pressed to form an oxygen-generating drug column with drug pits.

[0017] The ignition charge is pressed into the crater to form a preliminary blank;

[0018] The initial blank is dried to obtain the small-diameter, high-flow-rate microporous chemical oxygen delivery column.

[0019] In an optional embodiment, mixing the raw materials includes first mixing the sodium chlorate, the catalyst, the chlorine inhibitor, the metal powder, the ammonium carbonate, and the kaolin for 5-10 minutes to form a preliminary mixture; then adding the water to the preliminary mixture by dripping or steam, and continuing to mix for 5-10 minutes.

[0020] Preferably, the raw materials are mixed in a nitrogen atmosphere or a carbon dioxide atmosphere.

[0021] In an optional embodiment, the temperature for mixing the raw materials is 0-30°C;

[0022] Preferably, the drying temperature is 80–120°C and the drying time is 12–24 hours.

[0023] In an optional embodiment, when the oxygen-generating column is distributed with at least three different proportions of the raw materials along the direction from the top to the bottom, the different raw materials are placed in the mold respectively.

[0024] The present invention has the following beneficial effects:

[0025] The small-diameter, high-flow-rate microporous chemical oxygen generation column provided in this application achieves the formation of micropores on the surface and inside of the oxygen generation column during its preparation by adding pore-forming components (ammonia carbonate and / or ammonium bicarbonate) and kaolin to the raw materials. The micropores are uniform, and their proportion can be adjusted by regulating the amount of pore-forming components (ammonia carbonate and / or ammonium bicarbonate) and kaolin. This micropore design increases the combustion surface of the oxygen generation column, thus enabling the provision of a large flow rate of oxygen within a limited volume. Furthermore, this invention selects ammonium carbonate and / or ammonium bicarbonate as pore-forming components, whose decomposition temperature is much lower than that of sodium chlorate. Therefore, the decomposition of ammonium carbonate and / or ammonium bicarbonate can be achieved during the drying process of the oxygen generation column. The ammonia gas produced by this decomposition has an odor, and operators can determine whether the column is completely dried by observing the presence or absence of odor during the drying process, thereby ensuring product uniformity and the purity of the subsequent oxygen. Detailed Implementation

[0026] To make the objectives, 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. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0027] This invention provides a small-diameter, high-flow-rate microporous chemical oxygen propellant column, comprising an igniter and an oxygen-generating column. The oxygen-generating column is provided with a propellant pit, and the igniter is disposed in the propellant pit. The raw materials of the oxygen-generating column, by mass percentage, include: 55%–75% sodium chlorate, 4%–10% catalyst, 2%–8% chlorine inhibitor, 4%–10% metal powder, 5%–20% pore-forming component, 4%–10% kaolin, and 0.5%–2% water. The pore-forming component includes at least one of ammonium carbonate and ammonium bicarbonate.

[0028] Sodium chlorate serves as the oxygen source, releasing oxygen through a thermal decomposition reaction. The metal powder reacts with oxygen to generate a large amount of heat, providing heat for the decomposition process of the oxygen source. The catalyst lowers the decomposition temperature of the oxygen source, and the chlorine inhibitor eliminates the generated chlorine gas.

[0029] The pore-forming component in this application is selected from at least one of ammonium carbonate and ammonium bicarbonate. This component can generate ammonia and carbon dioxide during subsequent drying, thereby forming a microporous column from the oxygen-generating drug column. Furthermore, since ammonia has a pungent odor, operators can determine whether drying is complete by observing whether the pungent odor persists during the drying process, thus ensuring the complete decomposition of the pore-forming component.

[0030] Furthermore, in this application, the pore-forming component is in particulate form with a particle size of less than 100 mesh. By selecting the particle size of the pore-forming component, the size of the micropores can be adjusted. At the same time, by adjusting the amount of the pore-forming component, the number of micropores can also be adjusted, thereby affecting the combustion surface and flow rate of the propellant column.

[0031] Since the formation of micropores can easily lead to the collapse of the oxygen-generating propellant column, kaolin and water are added as binders in this application. Kaolin does not decompose other impurity gases when heated at high temperatures, thus ensuring the purity of the oxygen produced by the oxygen-generating propellant column.

[0032] Furthermore, if the viscosity of kaolin and water is still insufficient, a small amount of sodium silicate (0.5% to 2%) can be added. Sodium silicate has strong viscosity, but a high sodium silicate content may cause the propellant to burn out.

[0033] In this invention, the height of the oxygen-generating column is 100-120mm, the top diameter is 32-36mm, and the bottom diameter is 30-34mm, with the top diameter being larger than the bottom diameter. A pit is located at the top, with a diameter of 20-24mm and a depth of 8-12mm.

[0034] The oxygen-generating column contains at least three different proportions of raw materials along the direction from top to bottom. The content of pore-forming components and kaolin in the raw materials near the pit is higher than that in the parts far from the pit.

[0035] Specifically, the content of pore-forming components and kaolin decreases in a gradient from top to bottom, with each gradient of pore-forming components decreasing by 2%-4% and each gradient of kaolin decreasing by 1%-3%. The reduced content is compensated by supplementing the corresponding amount of sodium chlorate.

[0036] This invention allows for the adjustment of the pore size ratio of the pores by setting different amounts of raw materials, thereby enabling the regulation of the combustion surface and flow rate of the propellant column. The microporous propellant column has a large flow rate and a short combustion time.

[0037] The catalyst includes at least one of cobalt hydroxide powder, cobalt hydroxide powder, cobalt oxide powder, cobalt chloride, and manganese dioxide;

[0038] Preferably, the chloride inhibitor includes at least one of barium peroxide powder, sodium peroxide, and potassium superoxide;

[0039] Preferably, the metal powder is at least one of iron powder, titanium powder, and aluminum powder.

[0040] Furthermore, the present invention also provides a method for preparing a small-diameter, high-flow-rate microporous chemical oxygen delivery column, which includes the following steps:

[0041] S1. After mixing the raw materials evenly, place them in a mold and press them to form an oxygen-generating column with a drug pit.

[0042] Specifically, in a nitrogen or carbon dioxide atmosphere, sodium chlorate, catalyst, chlorine inhibitor, metal powder, pore-forming component and kaolin are mixed for 5 to 10 minutes at a temperature of 0-30°C to form a preliminary mixture; then water is added to the preliminary mixture by dripping or steam, and mixing continues for 5 to 10 minutes.

[0043] When the oxygen-generating propellant column contains at least three different proportions of raw materials distributed from top to bottom, each raw material is placed separately in the mold. It should be understood that regardless of the raw material ratio, the aforementioned requirements for raw material mass percentages must be met. However, while meeting these requirements, the content of the pore-forming component and kaolin is higher closer to the propellant pit. This ensures greater porosity near the pit, equivalent to a larger combustion surface, which is more beneficial for applications requiring high initial flow rates for chemical oxygen production. Furthermore, the combination of different proportions of raw materials allows for better flow rate control to meet the requirements of different flow rate curves.

[0044] S2. Press the ignition charge into the crater to form a preliminary blank.

[0045] By pressing, the ignition charge can be fully filled into the crater, and the subsequent ignition charge can provide heat to the oxygen-generating propellant column, thereby igniting the sodium chlorate.

[0046] S3. The initial blank is dried to obtain a small-diameter, high-flow-rate microporous chemical oxygenation column.

[0047] The drying temperature is 80–120℃, and the drying time is 12–24 hours.

[0048] This invention strengthens the initial blank through drying. At the same time, at the drying temperature, the pore-forming components decompose and release ammonia and carbon dioxide, thereby forming multiple micropores on the surface of the drug column. With the kaolin clay as a binder, the drug column has good structural strength and is not easy to collapse.

[0049] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0050] Example 1

[0051] This embodiment provides a small-diameter, high-flow-rate microporous chemical oxygen propellant column, which includes an ignition propellant and an oxygen-generating propellant column. The oxygen-generating propellant column is provided with a propellant pit, and the ignition propellant is placed in the propellant pit. The raw materials of the oxygen-generating propellant column include: 65 parts sodium chlorate, 4 parts catalyst (cobalt hydroxide powder), 2 parts chlorine inhibitor (barium peroxide powder), 5 parts metal powder (iron powder), 15 parts ammonium carbonate with a particle size of 100 mesh, 8 parts kaolin, and 1 part water.

[0052] Its preparation method is as follows:

[0053] S1. In a nitrogen or carbon dioxide atmosphere, weigh out sodium chlorate, catalyst, chlorine inhibitor, metal powder, ammonium carbonate, and kaolin in sequence, pour them into a mixing container, and use a mixing rod to perform preliminary mixing for about 10 minutes to ensure that the preliminary mixing is uniform.

[0054] S2. Add water to the pre-mixed powder using a dropper, mix for 10 minutes, and then mix thoroughly with a mixing stick.

[0055] S3. Place the powder into the mold in sequence and press it to form an oxygen-generating powder column with a powder pit.

[0056] S4. Use a tool to press the ignition charge into the pit of the oxygen-generating propellant column, wherein the propellant column dimensions are 34mm at the head, 32mm at the tail, and 110mm in height, and the pit diameter is 22mm and the depth is 10mm.

[0057] S5. Place the medicine column in an oven, adjust the temperature to 80℃, and bake for 24 hours. Then take it out and let it cool at room temperature.

[0058] Example 2

[0059] This embodiment is basically the same as Embodiment 1, except that the oxygen-generating column in this embodiment includes three different powder raw materials.

[0060] The first type of powder uses the same raw materials as the powder in Example 1. The second type of powder contains 2% less ammonium carbonate and kaolin than the first type of powder. The third type of powder contains 3% less ammonium carbonate and kaolin than the second type of powder.

[0061] Specifically, the first powder consists of: 65 parts sodium chlorate, 4 parts catalyst (cobalt hydroxide powder), 2 parts chlorine inhibitor (barium peroxide powder), 5 parts metal powder (iron powder), 15 parts ammonium carbonate, 8 parts kaolin, and 1 part water.

[0062] The second type of powder includes: 69 parts sodium chlorate, 4 parts catalyst (cobalt hydroxide powder), 2 parts chlorine inhibitor (barium peroxide powder), 5 parts metal powder (iron powder), 13 parts ammonium carbonate, 6 parts kaolin, and 1 part water.

[0063] The third type of powder includes: 75 parts sodium chlorate, 4 parts catalyst (cobalt hydroxide powder), 2 parts chlorine inhibitor (barium peroxide powder), 5 parts metal powder (iron powder), 10 parts ammonium carbonate, 3 parts kaolin, and 1 part water.

[0064] When placing the three powders into the mold, first place the third powder at the bottom of the mold, then place the second powder, and finally place the first powder. Then press to form an oxygen-generating powder column with a powder pit, with the first powder placed close to the powder pit.

[0065] Example 3

[0066] This embodiment is basically the same as Embodiment 1, except that sodium silicate is added in this embodiment. The raw materials of the oxygen-generating column include: 65 parts sodium chlorate, 4 parts catalyst (cobalt hydroxide powder), 2 parts chloride inhibitor (barium peroxide powder), 5 parts metal powder (iron powder), 15 parts ammonium carbonate, 7 parts kaolin, 1 part water and 1 part sodium silicate.

[0067] Example 4

[0068] This embodiment provides a small-diameter, high-flow-rate microporous chemical oxygen propellant column, which includes an ignition propellant and an oxygen-generating propellant column. The oxygen-generating propellant column is provided with a propellant pit, and the ignition propellant is placed in the propellant pit. The raw materials of the oxygen-generating propellant column include: 73 parts sodium chlorate, 4 parts catalyst (cobalt trioxide powder), 2 parts chlorine inhibitor (sodium peroxide powder), 4.5 parts metal powder (titanium powder), 10 parts ammonium bicarbonate with a particle size of 200 mesh, 6 parts kaolin, and 0.5 parts water.

[0069] Its preparation method is as follows:

[0070] S1. In a nitrogen or carbon dioxide atmosphere, weigh out sodium chlorate, catalyst, chlorine inhibitor, metal powder, ammonium carbonate, and kaolin in sequence, pour them into a mixing container, and use a mixing rod to perform preliminary mixing for about 8 minutes to ensure that the preliminary mixing is uniform.

[0071] S2. Add water to the pre-mixed powder using a dropper, mix for 8 minutes, and then mix thoroughly with a mixing rod.

[0072] S3. Place the powder into the mold in sequence and press it to form an oxygen-generating column with a powder pit.

[0073] S4. Use a tool to press the ignition charge into the pit of the oxygen-producing propellant column, wherein the propellant column dimensions are 32mm at the head, 30mm at the tail, and 100mm in height, and the pit diameter is 20mm and the depth is 8mm.

[0074] S5. Place the medicine column in an oven, adjust the temperature to 100℃, and bake for 24 hours. Then take it out and let it cool at room temperature.

[0075] Comparative Example 1

[0076] This comparative example is basically the same as Example 1, except that it does not contain ammonium carbonate.

[0077] Comparative Example 2

[0078] This comparative example is basically the same as Example 1, except that the amount of ammonium carbonate used in this comparative example is 25%, and the corresponding amount of sodium chlorate is reduced to 55%.

[0079] Comparative Example 3

[0080] This comparative example is basically the same as Example 1, except that the particle size of ammonium carbonate in this comparative example is too large, at 20 mesh.

[0081] Comparative Example 4

[0082] This comparative example is basically the same as Example 1, except that it does not contain kaolin.

[0083] Comparative Example 5

[0084] This comparative example is basically the same as Example 1, except that the amount of kaolin used in this comparative example is 13%, and the corresponding amount of sodium chlorate is reduced to 60%.

[0085] Comparative Example 6

[0086] This comparative example is basically the same as Example 1, except that ammonium carbonate and kaolin are omitted in this comparative example, and the amount of sodium chlorate is increased by 23%.

[0087] Comparative Example 7

[0088] This comparative example is basically the same as Example 1, except that the kaolin in Example 1 is replaced with sodium silicate, another binder.

[0089] The chemical oxygen propellant columns prepared in Examples 1-4 and Comparative Examples 1-7 were tested using the following method: a complete chemical oxygen propellant column of the same specification (same external dimensions) was wrapped with aluminosilicate ceramic fiber cotton, then loaded into a chemical oxygen generator with an ignition structure and the same filter structure, connected to a gas flow meter and a gas bag, and then the collected gas was measured to determine its composition.

[0090] The microporosity was determined by testing the weight of the drug column before and after drying. Oxygen flow rate is directly detected by a gas flow meter; combustion time is statistically analyzed by the difference between the start and end times of combustion; propellant strength can be tested by a pressure tester; and gas composition is determined by testing the concentrations of chlorine, carbon monoxide, and carbon dioxide collected in the gas bag using a gas detection tube to determine whether the gas composition meets the standards.

[0091]

[0092]

[0093] As can be seen from the table above, Examples 1-3 have relatively high flow rates and short durations, while Example 4's flow rate also meets the requirements. Comparative Example 1, lacking ammonium carbonate, did not undergo pore formation, resulting in high strength; however, its flow rate was low, failing to increase the flow rate. Comparative Example 2 used excessive amounts of ammonium carbonate, resulting in higher porosity, but the reduced amount of sodium chlorate (the oxygen source) led to a minimal increase in flow rate. Comparative Examples 3 and 4 had low propellant strength, causing flameout during combustion. Comparative Example 5 wasted propellant volume. Comparative Example 6 was ineffective in increasing flow rate. Comparative Example 7 had an even lower propellant flow rate, only increasing propellant strength.

[0094] In summary, the small-diameter, high-flow-rate microporous chemical oxygen generation column provided in this application achieves the formation of micropores on the surface and inside of the oxygen generation column during preparation by adding pore-forming components (ammonia carbonate and / or ammonium bicarbonate) and kaolin to the raw materials of the oxygen generation column. The micropores are uniform, and their proportion can be adjusted by regulating the amount of pore-forming components (ammonia carbonate and / or ammonium bicarbonate) and kaolin. The micropores increase the combustion surface of the oxygen generation column, thus enabling the provision of a large flow rate of oxygen within a limited volume. Furthermore, this invention selects ammonium carbonate and / or ammonium bicarbonate as pore-forming components, whose decomposition temperature is much lower than that of sodium chlorate. Therefore, the decomposition of ammonium carbonate and / or ammonium bicarbonate can be achieved during the drying process of the oxygen generation column. The ammonia gas produced by this decomposition has an odor, and operators can determine whether the column is completely dried by observing the presence or absence of odor during the drying process, thereby ensuring product uniformity and the purity of the subsequent oxygen.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A small-diameter, high-flow-rate microporous chemical oxygen delivery column, characterized in that, It includes an ignition charge and an oxygen-generating charge. The oxygen-generating charge is provided with a charge pit, and the ignition charge is placed in the charge pit. The raw materials of the oxygen-generating charge include, by mass percentage: 55%~75% sodium chlorate, 4%~10% catalyst, 2%~8% chlorine inhibitor, 4%~10% metal powder, 5%~20% pore-forming component, 4%~10% kaolin, and 0.5%~2% water. The pore-forming component includes at least one of ammonium carbonate and ammonium bicarbonate. The reagent pit is located at the top of the oxygen-generating reagent column. The oxygen-generating reagent column has at least three different proportions of the raw materials distributed along the direction from top to bottom. The content of the pore-forming component and the kaolin in the raw materials near the reagent pit is higher than that in the part away from the reagent pit. The content of the pore-forming component and the kaolin decreases in a gradient along the direction from top to bottom. Each gradient of the pore-forming component reduces by 2%-4%, and each gradient of the kaolin reduces by 1%-3%. The reduced content is supplemented with a corresponding amount of sodium chlorate.

2. The small-diameter, high-flow-rate microporous chemical oxygen delivery column according to claim 1, characterized in that, The raw materials of the oxygen-generating column also include 0.5% to 2% sodium silicate by mass percentage.

3. The small-diameter, high-flow-rate microporous chemical oxygen delivery column according to claim 1, characterized in that, The particle size of the pore-forming component is below 100 mesh.

4. The small-diameter, high-flow-rate microporous chemical oxygen delivery column according to claim 1, characterized in that, The oxygen-generating column has a height of 100-120mm, a top diameter of 32-36mm, a bottom diameter of 30-34mm, and the top diameter is larger than the bottom diameter; the pit has a diameter of 20-24mm and a depth of 8-12mm.

5. The small-diameter, high-flow-rate microporous chemical oxygen delivery column according to claim 1, characterized in that, The catalyst includes at least one of cobalt hydroxide powder, cobalt oxide powder, cobalt chloride, and manganese dioxide.

6. The small-diameter, high-flow-rate microporous chemical oxygen delivery column according to claim 1, characterized in that, The chlorine inhibitor includes at least one of barium peroxide powder, sodium peroxide, and potassium superoxide.

7. The small-diameter, high-flow-rate microporous chemical oxygen delivery column according to claim 1, characterized in that, The metal powder is at least one of iron powder, titanium powder, and aluminum powder.

8. A method for preparing a small-diameter, high-flow-rate microporous chemical oxygen delivery column as described in any one of claims 1-7, characterized in that, It includes: After the raw materials are mixed evenly, they are placed in a mold and pressed to form an oxygen-generating drug column with drug pits. The ignition charge is pressed into the crater to form a preliminary blank; The initial blank is dried to obtain the small-diameter, high-flow-rate microporous chemical oxygen delivery column.

9. The method for preparing a small-diameter, high-flow-rate microporous chemical oxygen delivery column according to claim 8, characterized in that, The raw material mixing process includes first mixing the sodium chlorate, the catalyst, the chlorine inhibitor, the metal powder, the pore-forming component, and the kaolin for 5-10 minutes to form a preliminary mixture; then adding the water to the preliminary mixture by dripping or steam, and continuing to mix for 5-10 minutes.

10. The method for preparing a small-diameter, high-flow-rate microporous chemical oxygen delivery column according to claim 9, characterized in that, The raw materials are mixed in a nitrogen atmosphere or a carbon dioxide atmosphere.

11. The method for preparing a small-diameter, high-flow-rate microporous chemical oxygen delivery column according to claim 8, characterized in that, The mixing temperature of the raw materials is 0-30℃.

12. The method for preparing a small-diameter, high-flow-rate microporous chemical oxygen delivery column according to claim 8, characterized in that, The drying temperature is 80~120℃, and the drying time is 12~24h.

13. The method for preparing a small-diameter, high-flow-rate microporous chemical oxygen delivery column according to claim 8, characterized in that, When the oxygen-generating column has at least three different proportions of the raw materials distributed along the direction from top to bottom, the different raw materials are placed in the mold in sequence.

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