Fuel-free low-temperature oxygen candle oxygen production flux core

Abstract

The invention relates to a fuel-free low-temperature oxygen candle oxygen-producing flux core which is prepared by uniformly dry-mixing 96-98 wt% of a chlorate oxygen-producing source, 1-2.5 wt% of a catalyst, 0.1-1 wt% of a chlorine inhibitor and 0.1-0.5 wt% of a high-thermal-conductivity carbon-based nano material as raw materials and pressing the raw materials, and the density of the oxygen-producing flux core is 1.9-2.5 g / cm < 3 >. The oxygen-producing flux core adopts a fuel-free formula, can realize continuous and stable combustion in a low-temperature environment of-50 DEG C until oxygen release is finished, and is high in safety, high in reliability, low in heat production, stable in oxygen release and free of chlorine in released gas.

Description

Technical Field

[0001] The invention belongs to the technical field of solid chemical oxygen sources and relates to an oxygen-generating wick for an oxygen candle, in particular to an oxygen-generating wick for an oxygen candle without adding fuel. The oxygen-generating wick of the invention can burn continuously and stably in an ultra-low temperature environment. Background Art

[0002] As an efficient and convenient solid oxygen source, oxygen candles demonstrate exceptional oxygen storage capacity and practicality. They possess an extremely high oxygen storage capacity, with a density comparable to liquid oxygen. Under the same volume conditions, they can store approximately three times as much oxygen as compressed oxygen. Furthermore, oxygen candles offer excellent stability, effectively preventing oxygen leaks. They also offer numerous advantages, including rapid oxygen production, high output, compact and lightweight equipment, and long-term storage without deterioration.

[0003] The oxygen candle is a sophisticated structure, integrating four core components: an ignition system, an oxygen generation system, a thermal insulation system, and a filtration system. The ignition system acts as a starting engine, precisely triggering the oxygen-generating grain in the oxygen generation system to begin operation, allowing the grain to burn steadily layer by layer like a "candle." The secret of the oxygen-generating grain lies in its unique chemical formula, typically composed of chlorate or perchlorate, a catalyst, and fuel. This combination ensures a spontaneous and continuous supply of oxygen.

[0004] To maintain continuous combustion of the oxygen-producing grain, most existing oxygen candles add metal fuel components to their grain formulas. For example, CN 107619021A and CN 107867675A both add titanium powder, iron powder, silicon powder, or magnesium powder as fuel. At the same time, the manufacturing process generally uses wet pressing technology to press and form the grain to ensure the quality and performance of the grain.

[0005] While adding fuel is intended to maintain sustained, stable combustion of the propellant, this practice often results in a significant increase in heat production. This increased heat directly leads to an increase in the candle wall temperature. If not properly controlled, excessive heat can accumulate within the candle. High temperatures not only affect the candle's efficiency but can also trigger a series of side reactions within the chlorate candle, which unfortunately produce harmful chlorine gas.

[0006] Therefore, when designing and preparing oxygen candles, it is particularly important to carefully control the type of fuel, the amount added, and the thermal management strategy to ensure that the oxygen candles can not only produce oxygen efficiently, but also operate safely and stably, avoiding unnecessary side reactions and potential safety risks.

[0007] In addition, most of the current oxygen candle products cannot burn stably and continuously in ultra-low temperature environments, which has become a problem that needs to be solved.

[0008] CN 114906815A discloses an ultra-low-temperature nano-solid oxygen candle oxygen generator. By adding an appropriate amount of nano-iron oxide or cobalt catalyst to chlorate, the oxygen candle achieves sustained combustion in low-temperature environments. However, its minimum combustion temperature is only -40°C. Even at ultra-low temperatures of -50°C, the pellet still cannot achieve stable and sustained combustion. Summary of the Invention

[0009] The purpose of the present invention is to provide a fuel-free low-temperature oxygen candle oxygen-generating wick to solve the problem of stable combustion of oxygen candles in a lower temperature environment.

[0010] In order to achieve the above-mentioned purpose of the invention, the fuel-free low-temperature oxygen candle oxygen-producing wick provided by the present invention does not use metal fuel in its composition, and can continue to burn until the oxygen release is completed in a low-temperature environment of -50°C. At the same time, it has high safety, strong reliability, low heat generation, stable oxygen release and no chlorine in the released gas.

[0011] Specifically, the fuel-free low-temperature oxygen candle oxygen-generating core of the present invention is prepared from the following raw materials in percentage by weight: 96-98% chlorate oxygen-generating source, 1-2.5% catalyst, 0.1-1% chlorine inhibitor, and 0.1-0.5% high thermal conductivity carbon-based nanomaterial.

[0012] Specifically, the high thermal conductivity carbon-based nanomaterial is any one of graphene, carbon nanotubes or nanographite.

[0013] More specifically, the catalyst of the present invention is a nano-oxide catalyst of iron, cobalt, nickel or manganese.

[0014] Furthermore, the catalyst is preferably selected from one or a combination of nano-ferroferric oxide, nano-cobaltic oxide, nano-cobaltous oxide, nano-cobaltous oxide, nano-cobaltous oxide, nano-manganese dioxide or nano-nickel oxide.

[0015] More preferably, the particle size of the catalyst in the present invention is 20-200 nm.

[0016] More specifically, in the fuel-free low-temperature oxygen candle oxygen-generating wick of the present invention, the chlorate oxygen-generating source is specifically one of potassium chlorate, sodium chlorate, potassium perchlorate or sodium perchlorate, or a mixture of any proportions of the above.

[0017] Furthermore, the particle size of the chlorate oxygen generating source of the present invention is preferably 30-80 mesh.

[0018] More specifically, the chlorine inhibitor of the present invention is one of barium peroxide, sodium peroxide, and lithium peroxide, or a combination of several of them in any proportion.

[0019] Furthermore, the present invention also provides a method for preparing the fuel-free low-temperature oxygen candle oxygen-generating core, which comprises dry-mixing the raw materials of the mass percentage in a mixer and pressing them into a density of 1.9-2.5 g / cm 3 Oxygen-generating core.

[0020] Furthermore, the present invention is preferably based on 10-15T / cm 2 The raw materials are pressed into shape in a mold under a pressure of .

[0021] Highly thermally conductive carbon-based nanomaterials, such as graphene, carbon nanotubes, or nanographite, possess exceptionally strong thermal conductivity. The purpose of adding a small amount of these highly thermally conductive carbon-based nanomaterials to the oxygen-producing core raw material in the present invention is to enable them to form a good heat conduction path within the oxygen-producing core. Even in the absence of metal fuel, once the oxygen candle device begins to react, the heat conduction of the highly thermally conductive carbon-based nanomaterials allows the localized high temperature generated by the reaction to be evenly transferred to the interior of the oxygen-producing core in a short period of time, thereby fully utilizing the heat generated by the initial reaction to ensure a continuous and balanced reaction. Therefore, during normal combustion, the oxygen-producing core of the present invention not only achieves an oxygen production rate exceeding 98.5%, but also maintains a solid oxygen generator wall temperature below 135°C during combustion.

[0022] There is another key role in adding high thermal conductivity carbon-based nanomaterials to the raw materials of the oxygen-producing core of the present invention. When the solid oxygen device is in a low-temperature environment for a long time, such as when the external temperature drops to -50°C, the temperature of the oxygen-producing core inside the device will also decrease accordingly. Once the oxygen-producing core is started under such severe cold conditions, the excellent high thermal conductivity of the carbon-based nanomaterials can quickly transfer heat to all parts of the oxygen-producing core, playing the role of internal preheating, thereby effectively reducing the temperature gradient inside the oxygen-producing core, minimizing the adverse effects caused by low temperature, and ensuring that the oxygen-producing core can burn fully and stably. According to combustion experiment tests, the oxygen-producing core of the present invention can still burn and release oxygen smoothly and completely in this low-temperature environment after being frozen at -50°C for 24-48 hours until the oxygen-producing core is completely burned, and the safety and reliability are improved.

[0023] The present invention finds that by adding a small amount of high thermal conductivity carbon-based nanomaterials to the raw materials for preparing the oxygen-producing core of the oxygen candle, the oxygen-producing core can be obtained by a dry pressing method without using any binder. The preparation process is simple and safe, and not only avoids the complex process of wet pressing the core, but also avoids the problem of producing a certain amount of chlorine gas due to incomplete drying of the wet pressing core.

[0024] The present invention avoids the use of metal fuel by adding a small amount of high thermal conductivity carbon-based nanomaterials to the oxygen-generating core. While achieving the same oxygen release rate, the proportion of chlorate oxygen-generating sources is significantly increased, thereby increasing the amount of oxygen released. Therefore, when the solid oxygen candle has the same weight of oxygen-generating core, the amount of oxygen released is greater, the heat generated is less, and the use is safer. Implementation Method

[0025] The specific embodiments of the present invention are described in further detail below in conjunction with the 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.

[0026] 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 also make similar improvements without violating the connotation of the present invention. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0027] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art. The terms used in the present invention specification are only for describing specific embodiments and are not intended to limit the present invention.

[0028] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] The terms "multiple", "multiple", "multiple times", "multiple groups", etc. used in the present invention, unless otherwise specified, refer to a quantity greater than or equal to 2; "above" includes the number itself, such as "more than two" includes two, three or more.

[0030] The term "preferably" used in the present invention is only used to describe an implementation method or example with better effects, and does not constitute a limitation on the scope of protection of the present invention.

[0031] The production processes, experimental methods or detection methods involved in the embodiments of the present invention, unless otherwise specified, are conventional methods in the prior art, and their names and / or abbreviations are conventional names in the field and are very clear and unambiguous in the relevant fields of use. 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 refer to experimental methods known in the art.

[0032] The various instruments, equipment, raw materials or reagents used in the embodiments of the present invention are not particularly limited in their sources and are all conventional products that can be purchased through regular commercial channels or prepared according to conventional methods well known to those skilled in the art.

[0033] In the embodiment of the present invention, the following method is specifically used to prepare the oxygen-generating core of the fuel-free low-temperature oxygen candle:

[0034] 1) According to the usage ratio of 96-98wt% of chlorate oxygen generating source, 1-2.5wt% of catalyst, 0.1-1wt% of chlorine inhibitor, and 0.1-0.5wt% of high thermal conductivity carbon-based nanomaterial, various raw materials are placed in a mixer and dry-mixed until uniformly mixed to obtain an oxygen generating agent;

[0035] 2) Pour the evenly mixed oxygen generator into the customized mold;

[0036] 3) On the tablet press, 10-15T / cm 2 The oxygen generator is pressed into a density of 1.9-2.5g / cm 3 Oxygen-generating core.

[0037] In a specific embodiment, the high thermal conductivity carbon-based nanomaterial can be any one of graphene, carbon nanotubes or nanographite, but graphene is most preferably used.

[0038] The present invention has no special requirements for the graphene used as a raw material, but further, the graphene can preferably be graphene with an oxygen content of less than 0.5%. More preferably, the graphene sheet size is 2-50 μm.

[0039] In a specific embodiment, the chlorate oxygen source can be one of potassium chlorate, sodium chlorate, potassium perchlorate or sodium perchlorate, or a mixture of any proportions thereof, and its particle size is preferably 30-80 mesh.

[0040] In a specific embodiment, the catalyst is preferably selected from one or a combination of nano-ferroferric oxide, nano-cobaltic oxide, nano-cobaltous oxide, nano-cobaltous oxide, nano-manganese dioxide or nano-nickel oxide, and the particle size of the nanocatalyst is 20-200 nm.

[0041] In a specific embodiment, the chlorine inhibitor is one of barium peroxide, sodium peroxide or lithium peroxide, or a combination of several of them in any proportion.

[0042] 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 operating accuracy are allowed. Example

[0043] Example 1

[0044] Based on the mass of each oxygen-producing core being 100 g, the raw materials include 97 g of sodium chlorate, 2.5 g of nano-cobalt tetroxide, 0.3 g of barium peroxide, and 0.2 g of graphene.

[0045] Weigh the proportion of chlorate, graphene and other raw materials, put them into the mixer and dry mix them until they are evenly mixed. Pour the mixed raw materials into a custom mold and press them on a tablet press at 10T / cm 2 The pressure is pressed to a density of 2.0g / cm 3 Oxygen-generating core.

[0046] The oxygen-generating core prepared above was packaged into a solid oxygen generator, placed in an ultra-low temperature freezing test box, and frozen at -50°C for 48 hours. The oxygen production test was then performed in the ultra-low temperature freezing test box at -50°C.

[0047] The test results show that the oxygen candle releases oxygen smoothly, the core burns completely, the oxygen production rate is 99%, the solid oxygen generator wall temperature is 134°C during the combustion process, and the generated gas meets the requirements of medical and aviation breathing oxygen (GB 8982-2009).

[0048] The gas produced during the combustion of oxygen candles was tested in accordance with the method specified in GB / T 11736-1989 "Standard method for the examination of chlorine in the atmosphere of residential areas - Methyl orange spectrophotometry", and no chlorine was detected.

[0049] Example 2

[0050] Based on the mass of each oxygen-producing core being 100 g, the raw materials include 96.7 g of sodium chlorate, 0.5 g of potassium perchlorate, 2 g of nano-cobalt trioxide, 0.5 g of sodium peroxide, and 0.3 g of graphene.

[0051] Weigh the proportion of chlorate, graphene and other raw materials, put them into the mixer and dry mix them until they are evenly mixed. Pour the mixed raw materials into a custom mold and press them on a tablet press at 10T / cm 2 The pressure is pressed into a density of 2.2g / cm 3 Oxygen-generating core.

[0052] The oxygen-generating core prepared above was packaged into a solid oxygen generator, placed in an ultra-low temperature freezing test box, and frozen at -50°C for 48 hours. The oxygen production test was then performed in the ultra-low temperature freezing test box at -50°C.

[0053] The test results show that the oxygen candle releases oxygen smoothly, the core burns completely, the oxygen production rate is 99.5%, the solid oxygen generator wall temperature is 132°C during the combustion process, and the generated gas meets the requirements of medical and aviation breathing oxygen (GB 8982-2009).

[0054] The gas produced during the combustion of oxygen candles was tested in accordance with the method specified in GB / T 11736-1989 "Standard method for the examination of chlorine in the atmosphere of residential areas - Methyl orange spectrophotometry", and no chlorine was detected.

[0055] Example 3

[0056] Based on the mass of each oxygen-generating core being 100 g, the raw materials include 97.5 g of sodium chlorate, 0.5 g of potassium perchlorate, 1.4 g of nano-cobaltous oxide, 0.1 g of lithium peroxide, and 0.5 g of carbon nanotubes.

[0057] Weigh the proportion of chlorate, graphene and other raw materials, put them into the mixer and dry mix them until they are evenly mixed. Pour the mixed raw materials into a custom mold and press them on a tablet press at 10T / cm 2 The pressure is pressed into a density of 2.3g / cm 3 Oxygen-generating core.

[0058] The oxygen-generating core prepared above was packaged into a solid oxygen generator, placed in an ultra-low temperature freezing test box, and frozen at -50°C for 48 hours. The oxygen production test was then performed in the ultra-low temperature freezing test box at -50°C.

[0059] The test results show that the oxygen candle releases oxygen smoothly, the core burns completely, the oxygen production rate is 99%, the solid oxygen generator wall temperature is 134°C during the combustion process, and the generated gas meets the requirements of medical and aviation breathing oxygen (GB 8982-2009).

[0060] The gas produced during the combustion of oxygen candles was tested in accordance with the method specified in GB / T 11736-1989 "Standard method for the examination of chlorine in the atmosphere of residential areas - Methyl orange spectrophotometry", and no chlorine was detected.

[0061] Comparative Example 1

[0062] Based on the mass of each oxygen-generating core being 100 g, the raw materials include 97.2 g of sodium chlorate, 2.5 g of nano-cobalt tetroxide, and 0.3 g of barium peroxide.

[0063] Weigh the proportion of chlorate and other raw materials, place them in a mixer and dry mix until they are evenly mixed. Pour the mixed raw materials into a custom mold and press them on a tablet press at 10T / cm 2 The pressure is pressed to a density of 2.0g / cm 3 Oxygen-generating core.

[0064] The oxygen-producing candle core was packaged into a solid oxygen generator and placed in an ultra-low temperature freezing test chamber. After being frozen at -40°C for 48 hours, an oxygen production test was carried out at -40°C in the ultra-low temperature freezing test chamber. The results showed that the oxygen candle core could burn completely and the oxygen production rate could reach 98%. However, the wall temperature of the solid oxygen generator reached as high as 165°C during the combustion process.

[0065] The packaged solid oxygen generator was then placed in an ultra-low temperature freezing test chamber. After being frozen at -50°C for 48 hours, an oxygen production test was conducted at -50°C in the ultra-low temperature freezing test chamber. The results showed that the core could not burn completely and the oxygen production rate was only 28%.

[0066] Comparative Example 2

[0067] Based on the mass of each oxygen-generating core of 100g, the raw materials include 92g sodium chlorate, 0.5g potassium perchlorate, 2.5g nano-cobalt tetroxide, 2g iron powder, 1g titanium powder, 1g barium peroxide, and 1g kaolin. The preparation method is the same as that of Example 1, and the density is pressed into 2.3g / cm 3 Oxygen-generating core.

[0068] The oxygen-generating core prepared above was packaged into a solid oxygen generator, placed in an ultra-low temperature freezing test box, and frozen at -50°C for 48 hours. The oxygen production test was then performed in the ultra-low temperature freezing test box at -50°C.

[0069] The test results show that the oxygen-producing core cannot burn stably and completely in an environment of -50°C, and the oxygen production rate is only 75%. During the combustion process, the temperature of the solid oxygen generator wall is detected to be as high as 205°C.

[0070] The technical features of the above embodiments of the present invention can be combined in any combination. To simplify the description, not all possible combinations of the technical features in the embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the description of the present invention.

[0071] The above embodiments represent 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 persons of ordinary skill in the art may make various substitutions, modifications, or improvements without departing from the principles and purpose of the present invention, all of which are intended to be within the scope of protection of the present invention.

Claims

1. A fuel-free low-temperature oxygen candle oxygen-generating wick is prepared from the following raw materials in percentage by weight: 96-98% of a chlorate oxygen-generating source, 1-2.5% of a catalyst, 0.1-1% of a chlorine inhibitor, and 0.1-0.5% of a high-thermal-conductivity carbon-based nanomaterial.

2. The fuel-free low-temperature oxygen candle oxygen-generating core according to claim 1 is characterized in that The high thermal conductivity carbon-based nanomaterial is any one of graphene, carbon nanotube or nanographite.

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

4. The fuel-free low-temperature oxygen candle oxygen-generating core according to claim 3 is characterized in that The catalyst is selected from one of nano-ferroferric oxide, nano-cobaltic oxide, nano-cobaltic oxide, nano-cobaltous oxide, nano-cobaltous oxide, nano-manganese dioxide or nano-nickel oxide, or a combination thereof.

5. The fuel-free low-temperature oxygen candle oxygen-generating core according to claim 1, 2, 3 or 4, characterized in that The particle size of the catalyst is 20-200 nm.

6. The fuel-free low-temperature oxygen candle oxygen-generating core according to claim 1 is characterized in that The chlorate oxygen source is one of potassium chlorate, sodium chlorate, potassium perchlorate or sodium perchlorate, or a mixture of any proportions of the above.

7. The fuel-free low-temperature oxygen candle oxygen-generating core according to claim 1 or 6, characterized in that The chlorate oxygen generating source has a particle size of 30-80 meshes.

8. The fuel-free low-temperature oxygen candle oxygen-generating core according to claim 1 is 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.

9. The method for preparing the fuel-free low-temperature oxygen candle oxygen-generating core according to claim 1 is to dry-mix the raw materials of the mass percentage in a mixer and then press them into a density of 1.9-2.5 g / cm 3 Oxygen-generating core.

10. The preparation method according to claim 9, characterized in that 10-15T / cm 2 The raw materials are pressed into shape in the mold under high pressure.