A low-temperature oxygen candle oxygen-generating column and its preparation method

Abstract

This invention relates to a low-temperature oxygen candle oxygen-generating column, which is made from a pretreated oxygen source of 95.5-98.5%, a catalyst of 0.5-3.5%, and a chlorine inhibitor of 0.2-1%, which are dry-mixed evenly and then pressed to a density of 1.9-2.5 g / cm³. 3 The oxygen-generating propellant column of this invention comprises a pretreated oxygen-generating source obtained by incorporating 0.2-0.65% by mass of a highly thermally conductive carbon-based nanomaterial into a chlorate-based oxygen-generating source, resulting in a powdered oxygen-generating source with a particle size of less than 300 μm. This oxygen-generating propellant column employs a fuel-free formulation, enabling continuous and stable combustion in a low-temperature environment of -55°C with an oxygen production rate exceeding 99%. Furthermore, the combustion process exhibits low heat generation, stable oxygen release, and is not prone to flameout. The residue after combustion is not prone to flow and exhibits no porosity.

Description

Technical Field

[0001] This invention belongs to the field of solid chemical oxygen source technology, and relates to an oxygen-generating propellant column for oxygen candles, particularly an oxygen-generating propellant column for oxygen candles that can burn stably and continuously at ultra-low temperatures and its preparation method. Background Technology

[0002] An oxygen candle is a solid oxygen source that produces high-purity oxygen by catalytically decomposing chlorate. When ignited, the chlorate decomposes under the action of a catalyst to produce oxygen. Oxygen candles offer significant advantages. First, they provide a stable oxygen supply, continuously and uniformly producing oxygen once activated, ensuring a constant supply to enclosed spaces, such as in mine rescues and submarine voyages. Second, they are small and portable, eliminating the need for bulky high-pressure gas cylinders, making storage and transportation easy and allowing for rapid deployment in emergencies. Third, they are extremely easy to operate, with a simple and intuitive triggering method that allows even non-professionals to quickly learn how to use them, ensuring timely oxygen supply in critical moments where every second counts, becoming a solid safeguard for life.

[0003] The oxygen candle has an ingenious structure, integrating four main parts: an ignition system, an oxygen production system, a filtration system, and a heat insulation system. The oxygen production column, as the core of the oxygen production system, is primarily characterized by its unique chemical formula, consisting of chlorate or perchlorate combined with catalysts and metallic fuels. The precise control of fuel type, dosage, and thermal management strategy is particularly important to ensure the spontaneous and continuous supply of oxygen, enabling the oxygen production column to operate safely and stably.

[0004] However, adding metallic fuels to oxygen candles poses several risks:

[0005] 1) Reduced safety. Metal fuels generally have high reactivity. Adding metal fuels to an oxygen-generating propellant column in an oxygen candle will directly increase the temperature of the oxygen candle wall due to the increased heat from combustion. If not properly controlled, excessive heat may accumulate inside the oxygen candle, increasing the risk of runaway combustion. Metals such as magnesium, aluminum, and titanium release large amounts of heat during combustion and react violently. Even slight changes in the reaction conditions of the oxygen candle, such as a slightly higher temperature or abnormal local oxygen concentration, can cause a rapid acceleration of the combustion process, potentially leading to explosions or other serious safety accidents.

[0006] 2) Production of harmful byproducts. The combustion of metallic fuels produces byproducts such as metal oxides. For example, aluminum produces aluminum oxide after combustion. If these metal oxide particles are inhaled, they can damage the respiratory tract and lungs. When oxygen candles are used in enclosed spaces such as submarines and mine shelters, these harmful byproducts can pollute the air and have long-term adverse effects on human health.

[0007] 3) Stability is affected. The addition of metallic fuel may affect the chemical stability of the oxygen-producing propellant column itself. Oxygen candles typically need to remain stable under certain temperature and humidity conditions for long-term storage and immediate use. Metallic fuel may react chemically with other components in the oxygen-producing propellant column, causing the column to deteriorate or clump during storage, thereby shortening the shelf life of the oxygen candle and reducing its reliability.

[0008] Meanwhile, the integrity of the morphology of the oxygen-producing propellant after combustion plays a crucial role in the oxygen-producing process of an oxygen candle. If the morphology of the reaction products becomes uncontrolled after combustion, it can easily lead to the formation of pores within the propellant, causing numerous serious problems. During oxygen candle combustion, reaction rates may vary in different parts of the propellant. Slight uneven distribution of components within the propellant, or inconsistencies in local temperature and oxygen concentration, can cause some areas to react too quickly. When the reactants in these areas are rapidly consumed, the surrounding reactants cannot replenish them in time, creating voids within the propellant and eventually developing into pores. These pores act as barriers, preventing close contact between the reaction front and unreacted reactants, significantly reducing the efficiency of the chemical reaction and consequently drastically decreasing the oxygen production rate.

[0009] Furthermore, most oxygen candle products currently on the market have a significant drawback: they struggle to maintain a stable and continuous combustion state in ultra-low temperature environments. As applications become increasingly diverse, the demand for oxygen in extreme cold conditions, such as polar scientific expeditions and high-altitude cold-region rescue operations, is becoming increasingly prominent. Therefore, the reliable operation of solid oxygen candles in frigid environments is crucial. Overcoming the challenge of low-temperature adaptability for solid oxygen candles is urgent, as it not only affects the performance of related equipment in extremely cold environments but is also a key element in expanding the application boundaries of oxygen candles and ensuring the smooth progress of special missions.

[0010] CN 114906815A discloses an ultra-low temperature nano-solid oxygen candle oxygen generator, which achieves continuous combustion of the oxygen candle in a low-temperature environment by adding an appropriate amount of nano-iron oxide or cobalt catalyst to chlorate. However, its lowest combustion temperature can only reach -40℃, and after further reducing the temperature, its oxygen-generating propellant still cannot achieve stable continuous combustion. Summary of the Invention

[0011] The purpose of this invention is to provide a low-temperature oxygen candle oxygen-generating propellant column and its preparation method, so that the oxygen candle can burn stably at a lower temperature and the residue after combustion is not easily flowed.

[0012] To achieve the above-mentioned objective, the low-temperature oxygen candle oxygen-generating column of the present invention does not use metal fuel, but is prepared solely from the following raw materials in the following mass percentages: 95.5-98.5% pretreated oxygen-generating source, 0.5-3.5% catalyst, and 0.2-1% chlorine inhibitor. The pretreated oxygen-generating source is a powdered oxygen-generating source with a particle size of less than 300 μm obtained by incorporating 0.2-0.65% by mass of a highly thermally conductive carbon-based nanomaterial into a chlorate-based oxygen-generating source.

[0013] The low-temperature oxygen candle oxygen-generating propellant column of the present invention can continue to burn until the oxygen release ends in a low-temperature environment of -55℃, and has low heat generation and stable oxygen release.

[0014] Specifically, the chlorate-based oxygen source in the pretreatment oxygen source described in this invention is one of potassium chlorate, sodium chlorate, potassium perchlorate, or sodium perchlorate, or a mixture of several in any proportion.

[0015] More specifically, the highly thermally conductive carbon-based nanomaterial is any one of graphene, carbon nanotubes, or nanographite.

[0016] The main function of adding a catalyst to an oxygen-generating column is to lower the decomposition temperature of chlorate-based oxygen-generating sources, thereby reducing the surface temperature of the oxygen candle. The catalyst described in this invention is a nano-oxide catalyst made of iron, cobalt, nickel, or manganese.

[0017] Furthermore, the catalyst is preferably selected from one or a combination of several of nano-iron oxide, nano-cobalt oxide, nano-cobalt trioxide, nano-cobalt suboxide, nano-manganese dioxide, or nano-nickel oxide.

[0018] Furthermore, the particle size of the catalyst described in this invention is 20-200 nm.

[0019] Furthermore, the purpose of adding a chlorine inhibitor is to eliminate the generated chlorine gas and reduce its content. The chlorine inhibitor described in this invention is one of barium peroxide, sodium peroxide, and lithium peroxide, or a combination of several in any proportion.

[0020] Furthermore, the present invention also provides a method for preparing the aforementioned low-temperature oxygen candle oxygen-generating column, specifically comprising:

[0021] 1) The high thermal conductivity carbon-based nanomaterials in the specified proportion were incorporated into a chlorate-based oxygen-generating source and ball-milled to obtain a powdered pretreated oxygen-generating source with a particle size of less than 300 μm.

[0022] 2) The pretreated oxygen source, catalyst, and chlorine inhibitor are dry-mixed in a mixer until uniformly mixed according to the stated mass percentage, and then pressed into shape in a mold;

[0023] 3) After demolding, dry at 100-150℃ to obtain a density of 1.9-2.5 g / cm³.3 Oxygen-producing column.

[0024] Furthermore, the present invention preferably uses 10-15 T / cm 2 The pressure is used to press the uniformly mixed raw materials into shape in a mold.

[0025] Furthermore, the drying time is preferably 3-8 hours.

[0026] Graphene, carbon nanotubes, or nanographite, among other highly thermally conductive carbon-based nanomaterials, possess exceptionally strong thermal conductivity. This invention, by adding a small amount of such material to the raw material of the oxygen-generating propellant column, creates a favorable heat conduction path within the column. Even without metallic fuel, once the oxygen candle device begins its reaction, the thermal conductivity of the carbon-based nanomaterials allows the locally generated high temperatures to be uniformly transferred to the interior of the oxygen-generating propellant column within a short time, fully utilizing the initial heat to ensure a sustained and balanced reaction. Therefore, the oxygen-generating propellant column of this invention can still burn normally without any metallic fuel, achieving an oxygen production rate of over 99%, and maintaining a solid oxygen generator wall temperature below 130°C during combustion.

[0027] Meanwhile, since no metal fuel is used, the oxygen-generating propellant column of this invention has high safety, high reliability, low heat generation, stable oxygen release, and is not easy to extinguish. The residue after combustion is not easy to flow and avoids the formation of holes.

[0028] Another advantage of adding highly thermally conductive carbon-based nanomaterials to the oxygen-generating propellant of this invention is that it can reduce temperature differences through preheating even when the external ambient temperature drops to extremely low levels, ensuring complete combustion of the oxygen-generating propellant. Combustion experiments showed that after freezing the oxygen-generating propellant of this invention at -50°C for 24-48 hours, it could still stably and completely continue to burn and release oxygen in this low-temperature environment until the propellant was completely burned, thus improving safety and reliability.

[0029] More importantly, this invention further reduces the low-temperature operating temperature of the oxygen-generating propellant by first preparing a pretreated oxygen-generating source using chlorate-based oxygen-generating sources and highly thermally conductive carbon-based nanomaterials, and then pressing it with other raw materials. It can even still burn completely when the external ambient temperature drops to -55°C.

[0030] This invention discovers that by adding a small amount of highly thermally conductive carbon-based nanomaterials to the raw materials for preparing oxygen-generating oxygen candles, oxygen-generating oxygen candles can be obtained by dry pressing without the use of any binder. The preparation process is simple and safe, avoiding not only the complex process of wet pressing for preparing oxygen-generating cylinders, but also the problem of generating a certain amount of chlorine gas that may be caused by incomplete drying of wet-pressed cylinders.

[0031] This invention, by adding a small amount of highly thermally conductive carbon-based nanomaterials to the oxygen-generating propellant column, avoids the use of metal fuels while achieving the same oxygen release rate. This increases the proportion of chlorate-based oxygen-generating sources and the amount of oxygen released. With the same weight of oxygen-generating propellant column in a solid oxygen candle, it releases more oxygen, generates less heat, and is safer to use. Attached Figure Description

[0032] Figure 1 This is the state of the oxygen-generating propellant column prepared in Example 1 after combustion.

[0033] Figure 2 This is a volumetric flow rate-time curve of the oxygen-generating propellant column prepared in Example 2 during combustion.

[0034] Figure 3 This is a volumetric flow rate-time curve of the oxygen-generating propellant column prepared in Comparative Example 2 during combustion.

[0035] Figure 4 This is the state of the oxygen-generating propellant column prepared in Comparative Example 3 after combustion. Detailed Implementation

[0036] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention, so that those skilled in the art can fully understand and utilize the present invention.

[0037] However, the present invention can be implemented in many other ways different from those described in the following embodiments, and those skilled in the art can make similar improvements without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0038] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by those skilled in the art. The terminology used in this specification is merely for describing particular embodiments and is not intended to limit the invention.

[0039] The term "and / or" as used in this invention includes any and all combinations of one or more of the associated listed items.

[0040] The terms “multiple,” “various,” “multiple times,” “multiple groups,” etc., used in this invention, unless otherwise specified, refer to a quantity greater than or equal to 2; “more than” includes the number itself, such as “two or more” including two, three or more kinds.

[0041] The term "preferred" as used in this invention is only used to describe a more effective implementation or embodiment, and does not constitute a limitation on the scope of protection of this invention.

[0042] Unless otherwise specified, the production processes, experimental methods, or testing methods involved in the embodiments of this invention are all conventional methods in the prior art, and their names and / or abbreviations are all conventional names in the field, which are very clear and distinct in the relevant application areas. Those skilled in the art can understand the conventional process steps based on the names and apply the corresponding equipment, and implement them according to conventional conditions or conditions recommended by the manufacturer, or by referring to experimental methods known in the field.

[0043] The various instruments, equipment, raw materials or reagents used in the embodiments of this invention are not subject to any special restrictions on their source. They are all conventional products that can be purchased through regular commercial channels and can be prepared according to conventional methods known to those skilled in the art.

[0044] In the embodiments described in this invention, the low-temperature oxygen candle oxygen-generating propellant column is prepared using the following method:

[0045] 1) Add 0.2-0.65% by weight of highly thermally conductive carbon-based nanomaterials to chlorate-based oxygen-generating sources, ball mill the mixture and pass it through a 50-mesh sieve to obtain a powdered pretreated oxygen-generating source with a particle size of less than 300 μm.

[0046] 2) The pretreated oxygen source, catalyst, and chlorine inhibitor are mixed evenly in a mixer according to the following mass percentages: 95.5-98.5% pretreated oxygen source, 0.5-3.5% catalyst, and 0.2-1% chlorine inhibitor. The mixture is then poured into a custom mold and pressed on a tablet press at 10-15 T / cm³. 2 Pressure pressing molding;

[0047] 3) After demolding, dry at 100-150℃ for 3-8 hours to obtain a product with a density of 1.9-2.5 g / cm³. 3 Oxygen-producing column.

[0048] In a specific embodiment, the chlorate-based oxygen-generating source can be one or a mixture of several of potassium chlorate, sodium chlorate, potassium perchlorate, or sodium perchlorate in any proportion, and its particle size is preferably 30-80 mesh.

[0049] In specific embodiments, the highly thermally conductive carbon-based nanomaterial can be any one of graphene, carbon nanotubes, or nanographite, but graphene is the most preferred.

[0050] This invention does not impose any special requirements on the graphene used as a raw material, but further, the graphene is preferably graphene with an oxygen content of less than 0.5%. More preferably, the sheet size of the graphene is 2-50 μm.

[0051] In specific embodiments, the catalyst is preferably selected from one or more of nano-iron oxide, nano-cobalt oxide, nano-cobalt trioxide, nano-cobalt suboxide, nano-manganese dioxide, or nano-nickel oxide, and the particle size of the nano-catalyst is 20-200 nm.

[0052] In a specific embodiment, the chloride inhibitor is one or a combination of several of barium peroxide, sodium peroxide, or lithium peroxide in any proportion.

[0053] Unless otherwise specified, the amounts of raw material components and measurement parameters such as temperature and time involved in the embodiments of the present invention may have slight deviations within the range of weighing or measurement accuracy, and acceptable deviations caused by instrument testing accuracy or operational accuracy are allowed. Example

[0054] Example 1

[0055] 97g of sodium chlorate and 0.3g of graphene were weighed, mixed by ball milling and pretreated by vibrating sieve to obtain powder with a particle size of less than 300μm, which was used as the oxygen source for pretreatment.

[0056] The obtained pretreated oxygen source was placed together with other raw material components, including 2.2g of catalyst nano-cobalt tetroxide and 0.5g of chlorine inhibitor barium peroxide, and dry-mixed in a twin-screw mixer until uniformly mixed.

[0057] Pour the mixed ingredients into a custom mold and press them onto a tablet press at 10T / cm. 2 The material is formed by pressure pressing, demolded, and dried in an oven at 120℃ for 5 hours to produce a product with a density of 2.0 g / cm³. 3 Oxygen-producing column.

[0058] The oxygen-generating propellant column prepared in this embodiment was packaged into a solid oxygen generator, and the following tests were performed:

[0059] 1) The solid oxygen generator was placed in an ultra-low temperature freezing chamber and frozen at -55℃ for 48 hours. Then, the combustion performance was tested at -55℃ in the ultra-low temperature freezing chamber. The oxygen-producing column could be completely burned. The combustion process was monitored by gas flow detection method. The analysis showed that the oxygen production volume flow rate-time curve was stable and the oxygen production rate was 99%. The produced gas met the requirements of medical and aviation breathing oxygen (GB 8982-2009).

[0060] 2) The solid oxygen generator wall temperature during combustion is 132℃, and the reaction products after combustion are as follows: Figure 1 It is a layered accumulation with no holes and no flow.

[0061] 3) The gas produced during the combustion process of the solid oxygen generator was tested according to the method in GB / T 11736-1989 "Standard Method for Hygienic Examination of Chlorine in the Atmosphere of Residential Areas - Methyl Orange Spectrophotometric Method", and no chlorine component was detected.

[0062] Example 2

[0063] 95.5g of sodium chlorate and 0.5g of graphene were weighed, mixed by ball milling and pretreated by vibrating sieve to obtain powder with a particle size of less than 300μm, which was used as the oxygen source for pretreatment.

[0064] The obtained pretreated oxygen source was placed together with other raw material components, including 3.5g of catalyst nano-cobalt trioxide and 0.5g of chlorine inhibitor sodium peroxide, and then dry-mixed in a twin-screw mixer until uniformly mixed.

[0065] Pour the mixed ingredients into a custom mold and press them onto a tablet press at 10T / cm. 2 The material is formed by pressure pressing, demolded, and dried in an oven at 130℃ for 3 hours to produce a product with a density of 1.9 g / cm³. 3 Oxygen-producing column.

[0066] The oxygen-generating propellant column prepared in this embodiment was packaged into a solid oxygen generator, and the following tests were performed:

[0067] 1) The solid oxygen generator was placed in an ultra-low temperature freezing chamber and frozen at -55℃ for 48 hours. Combustion performance was then tested at -55℃ within the chamber, demonstrating complete combustion of the oxygen-generating propellant column. The combustion process was monitored using a gas flow detection method. Figure 2 As shown, the oxygen production volume flow rate-time curve is stable, with an oxygen production rate of 99.5%; the produced gas meets the requirements of medical and aviation breathing oxygen (GB 8982-2009).

[0068] 2) During the combustion process, the wall temperature of the solid oxygen generator is 128℃. After combustion, the reaction products are in the form of layered accumulation, without pores or flow.

[0069] 3) The gas produced during the combustion process of the solid oxygen generator was tested according to the method in GB / T 11736-1989 "Standard Method for Hygienic Examination of Chlorine in the Atmosphere of Residential Areas - Methyl Orange Spectrophotometric Method", and no chlorine component was detected.

[0070] Example 3

[0071] 96.5g of sodium chlorate and 0.4g of carbon nanotubes were weighed, mixed by ball milling and pretreated by vibrating sieve to obtain powder with a particle size of less than 300μm, which was used as the oxygen source for pretreatment.

[0072] The obtained pretreated oxygen source was placed together with other raw material components, including 2.6g of nano-cobalt oxide catalyst and 0.5g of lithium peroxide chloride inhibitor, and then dry-mixed in a twin-screw mixer until uniformly mixed.

[0073] Pour the mixed ingredients into a custom mold and press them onto a tablet press at 10T / cm. 2 The material is formed by pressure pressing, demolded, and dried in an oven at 110℃ for 6 hours to produce a product with a density of 2.3 g / cm³. 3 Oxygen-producing column.

[0074] The oxygen-generating propellant column prepared in this embodiment was packaged into a solid oxygen generator, and the following tests were performed:

[0075] 1) The solid oxygen generator was placed in an ultra-low temperature freezing chamber and frozen at -55℃ for 48 hours. The combustion performance was then tested at -55℃ in the ultra-low temperature freezing chamber. The oxygen-producing propellant column was completely burned. The combustion process was monitored by gas flow detection method. The analysis showed that the oxygen production volume flow rate-time curve was stable and the oxygen production rate was 99.4%. The produced gas met the requirements of medical and aviation breathing oxygen (GB 8982-2009).

[0076] 2) During the combustion process, the wall temperature of the solid oxygen generator is 127℃. After combustion, the reaction products are in the form of layered accumulation, without pores or flow.

[0077] 3) The gas produced during the combustion process of the solid oxygen generator was tested according to the method in GB / T 11736-1989 "Standard Method for Hygienic Examination of Chlorine in the Atmosphere of Residential Areas - Methyl Orange Spectrophotometric Method", and no chlorine component was detected.

[0078] Comparative Example 1

[0079] Weigh 97.3g of sodium chlorate, ball mill and vibrate sieve to obtain a powdered oxygen source with a particle size of less than 300μm.

[0080] The obtained oxygen source was placed together with other raw material components, including 2.2g of catalyst nano-cobalt tetroxide and 0.5g of chloride inhibitor barium peroxide, and dry-mixed in a twin-screw mixer until uniformly mixed.

[0081] Pour the mixed ingredients into a custom mold and press them onto a tablet press at 10T / cm. 2 The material is formed by pressure pressing, demolded, and dried in an oven at 120℃ for 5 hours to produce a product with a density of 2.0 g / cm³. 3 Oxygen-producing column.

[0082] The oxygen-generating propellant column was packaged into a solid oxygen generator and placed in an ultra-low temperature freezing test chamber. After being frozen at -40℃ for 48 hours, the oxygen production test was conducted at -40℃ in the ultra-low temperature freezing test chamber. The oxygen-generating propellant column could burn smoothly with an oxygen production rate of 95%.

[0083] The packaged solid oxygen generator was then placed in an ultra-low temperature freezing test chamber and frozen at -55°C for 48 hours. After that, an oxygen production test was conducted at -55°C in the ultra-low temperature freezing test chamber. The results showed that the oxygen-generating propellant could not be completely burned, and the oxygen production rate was only 31%.

[0084] Comparative Example 2

[0085] Weigh out 97g of sodium chlorate, 0.3g of graphene, 2.2g of nano cobalt tetroxide, and 0.5g of barium peroxide, and dry mix them together in a twin-screw mixer until they are evenly mixed.

[0086] Pour the mixed ingredients into a custom mold and press them onto a tablet press at 10T / cm. 2 The material is formed by pressure pressing, demolded, and dried in an oven at 120℃ for 5 hours to produce a product with a density of 2.0 g / cm³. 3 Oxygen-producing column.

[0087] The oxygen-generating propellant column was packaged into a solid oxygen generator and placed in an ultra-low temperature freezing chamber. After freezing at -55°C for 48 hours, it was tested at -55°C within the ultra-low temperature freezing chamber, and its performance was monitored using a gas flow rate detection method. Figure 3 As shown, the oxygen production volume flow rate-time curve is not stable, indicating incomplete combustion of the oxygen-producing propellant, with an oxygen production rate of 60.5%.

[0088] Comparative Example 3

[0089] Weigh out 92g of sodium chlorate, 0.5g of potassium perchlorate, 2.5g of nano cobalt tetroxide, 2g of iron powder, 1g of titanium powder, 1g of barium peroxide, and 1g of kaolin. Place them together in a twin-screw mixer and dry mix until they are evenly mixed.

[0090] Pour the mixed ingredients into a custom mold and press them onto a tablet press at 10T / cm. 2 The material is formed by pressure pressing, demolded, and dried in an oven at 120℃ for 5 hours to produce a product with a density of 2.3 g / cm³. 3 Oxygen-producing column.

[0091] The oxygen-generating propellant column was packaged into a solid oxygen generator, placed in an ultra-low temperature freezing chamber, and frozen at -55°C for 48 hours. The test was then conducted at -55°C inside the ultra-low temperature freezing chamber.

[0092] Test results showed that the oxygen-generating propellant could not burn stably at -55℃. During combustion, the solid oxygen generator wall temperature reached an excessively high 205℃, resulting in incomplete combustion of the propellant and an oxygen production rate of only 72%. Figure 4 As shown, the residue after combustion is hollow and flows.

[0093] The technical features of the above embodiments of the present invention can be combined arbitrarily. For the sake of brevity, not all possible combinations of the various technical features in the embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of the present invention.

[0094] The above embodiments illustrate several specific and detailed implementations of the present invention, but should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various substitutions, modifications, or improvements without departing from the principles and spirit of the present invention, all of which should be included within the scope of protection of the present invention.

Claims

1. A low-temperature oxygen candle oxygen-generating column, prepared from the following raw materials in the indicated mass percentages: 95.5-98.5% pretreated oxygen-generating source, 0.5-3.5% catalyst, and 0.2-1% chlorine inhibitor, the sum of the mass percentages of each component being 100%; wherein the pretreated oxygen-generating source is a powdered oxygen-generating source with a particle size of less than 300 μm obtained by doping a chlorate-based oxygen-generating source with 0.2-0.65% of its mass of a highly thermally conductive carbon-based nanomaterial, wherein the highly thermally conductive carbon-based nanomaterial is any one of graphene, carbon nanotubes, or nanographite.

2. The low-temperature oxygen candle oxygen-generating column according to claim 1, characterized in that... The chlorate-based oxygen source in the pretreatment oxygen source is one or a mixture of several of potassium chlorate, sodium chlorate, potassium perchlorate, or sodium perchlorate in any proportion.

3. The low-temperature oxygen candle oxygen-generating column according to claim 1, characterized in that... The catalyst is a nano-oxide catalyst of iron, cobalt, nickel or manganese.

4. The low-temperature oxygen candle oxygen-generating column according to claim 3, characterized in that... The catalyst is selected from one or a combination of several of the following: nano-iron oxide, nano-cobalt oxide, nano-cobalt trioxide, nano-cobalt suboxide, nano-manganese dioxide, or nano-nickel oxide.

5. The low-temperature oxygen candle oxygen-generating column according to claim 1, 3, or 4, characterized in that... The catalyst has a particle size of 20-200 nm.

6. The low-temperature oxygen candle oxygen-generating column according to claim 1, characterized in that... The chlorine inhibitor is one of barium peroxide, sodium peroxide, or lithium peroxide, or a combination of several of them in any proportion.

7. The method for preparing the low-temperature oxygen candle oxygen-generating column of claim 1, comprising: 1) The high thermal conductivity carbon-based nanomaterials of the mass percentage were incorporated into a chlorate-based oxygen-generating source, and the mixture was ball-milled to obtain a powdered pretreated oxygen-generating source with a particle size of less than 300 μm. 2) The pretreated oxygen source, catalyst, and chlorine inhibitor are dry-mixed in a mixer until uniformly mixed according to the stated mass percentage, and then pressed into shape in a mold; 3) After demolding, dry at 100-150℃ to obtain a density of 1.9-2.5 g / cm³. 3 Oxygen-producing column.

8. The preparation method according to claim 7, characterized in that... 10-15T / cm 2 The pressure compresses the uniformly mixed raw materials into shape in the mold.

9. The preparation method according to claim 7, characterized in that: Drying time: 3-8 hours.

Images