A sustained-release negative oxygen ion functional material, a preparation method thereof and application thereof

Abstract

This invention relates to the field of crystal materials technology, and in particular to a functional material that continuously releases negative oxygen ions, its preparation method, and its application. The preparation method includes "crushing calcite, performing initial grinding, calcining, and secondary grinding sequentially to obtain the functional material that continuously releases negative oxygen ions." This invention, through initial grinding, calcination, and secondary grinding, alters the original crystal lattice structure of calcite and forms dense defect sites, thereby controlling the electrostatic field distribution at the crystal interface and achieving disordered charge movement trajectories. Ultimately, it yields a functional material that continuously and without attenuation releases small-particle-size, high-concentration negative oxygen ions without external energy excitation.

Description

Technical Field

[0001] This invention relates to the field of crystal materials technology, and in particular to a functional material that continuously releases negative oxygen ions, its preparation method, and its application. Background Technology

[0002] The rise of domestic artificial negative ion generation technology stems from society's urgent need for high-quality air purification. Currently, in-depth research in this field is still in its early stages. Negative ions are known as "air vitamins," and their value even surpasses that of ordinary vitamins. They not only provide physiological nourishment similar to vitamins but also possess the unique advantage of actively capturing and decomposing pollutants. They can undergo oxidation-reduction reactions with harmful gases, bacteria, and viruses in the air, achieving highly efficient air purification and improving air quality at its source. Furthermore, the positive effects of negative ions on human health are particularly significant, such as enhancing immunity, improving sleep quality, relieving anxiety and fatigue, regulating nerve function, and optimizing respiratory efficiency, providing multifaceted protection for human health.

[0003] Especially with the continued acceleration of urbanization, industrial pollution and indoor air pollution have become increasingly prominent issues. Residents' health awareness is constantly improving, and their demand for healthy lifestyles and high-quality indoor air is becoming more urgent. Currently, artificial negative ion generation technology has been initially applied in fields such as air purification. Compared with traditional physical filtration and chemical adsorption methods, it shows significant advantages. Its characteristics, such as not requiring frequent filter replacements, ease of operation, and low maintenance costs, have attracted widespread market attention and become an important development direction in the air purification field.

[0004] Currently, the mainstream methods for artificially generating negative oxygen ions mainly include high-voltage corona discharge, ultraviolet irradiation, high-voltage water ionization, and natural mineral methods. However, each method has significant limitations and cannot meet practical application needs. High-voltage corona discharge is currently the most widely used method on the market. Its principle is similar to the generation of negative oxygen ions by natural lightning. However, during operation, it is accompanied by problems such as the generation of stray ions, ozone, and static electricity. Among these, ozone exceeding the safety threshold can pose potential hazards to human health and environmental safety, and the generated ions have low activity. Ultraviolet irradiation uses ultraviolet radiation to ionize air molecules and release electrons. These electrons are captured by oxygen molecules to form negative oxygen ions. However, this method has high radiation costs and difficult equipment maintenance, making large-scale industrial application impossible. High-pressure water ionization generates negative oxygen ions by ionizing water molecules under specific high temperature, high pressure, or ultraviolet-assisted conditions, but the concentration of negative oxygen ions generated is relatively low, making it difficult to meet the actual needs of air purification and health care. Natural mineral methods utilize the weak electrode energy of natural minerals such as tourmaline, opal, chrysoprase, and hexagonal stone to electrolyze moisture in the air to generate negative oxygen ions. While these mineral materials can naturally release negative oxygen ions, they rely on specific external conditions such as humidity, light, or triboelectric charging, and the release concentration is relatively low (usually stable at 500 ions / cm³). 3 The following values ​​are far below the clean air standards set by the World Health Organization (1000-1500 particles / cm²). 3 However, it also has problems such as high energy consumption, high noise, and poor release stability.

[0005] Therefore, there is an urgent need to develop a functional material that is low in preparation cost, easy to use, safe and reliable, and can release high concentrations of negative oxygen ions for a long time. This will help break through existing technological bottlenecks, promote the industrialization and upgrading of artificial negative oxygen ion preparation technology, and better meet society's dual needs for air purification and human health. Summary of the Invention

[0006] The purpose of this invention is to provide a functional material that continuously releases negative oxygen ions, its preparation method, and its application, thereby solving the technical problems of existing negative oxygen ion materials, such as low release concentration, large particle size, dependence on external energy, safety hazards, and easy performance degradation.

[0007] To achieve the above objectives, the present invention provides a method for preparing a functional material that continuously releases negative oxygen ions, comprising the following preparation steps: A method for preparing a functional material that continuously releases negative oxygen ions includes the following preparation steps: Calcite is crushed, initially ground, calcined, and then ground a second time to obtain a functional material that continuously releases negative oxygen ions. The calcination process includes a heating process, a heat holding process, and a cooling process performed sequentially. The heating process includes a first stage of heating, a second stage of heating, and a third stage of heating. The target temperature for the first stage of heating is 400-500℃, and the heating rate for the first stage is 5-10℃ / min. The target temperature for the second stage of heating is 1400-1500℃, and the heating rate for the second stage is 40-45℃ / min. The target temperature for the third stage of heating is 1800-2000℃, and the heating rate for the third stage is 5-10℃ / min. The temperature during the heat preservation process is consistent with the target temperature of the third stage of heating, and the heat preservation process lasts for 80-100 minutes. The cooling process includes a first-stage cooling and a second-stage cooling; The target temperature for the first stage of cooling is 1400-1500℃, and the cooling rate for the first stage of cooling is 5-10℃ / min. The target temperature for the second stage of cooling is 25-30℃, and the cooling rate for the second stage of cooling is 60-65℃ / min.

[0008] In this invention, after the initial grinding, the particle size of the calcite powder obtained is preferably 1-50 μm, more preferably 10-40 μm, and even more preferably 20-30 μm.

[0009] In this invention, the target temperature for the first stage of heating is preferably 450°C, and the heating rate for the first stage of heating is preferably 8°C / min; the target temperature for the second stage of heating is preferably 1450°C, and the heating rate for the second stage of heating is preferably 42°C / min; the target temperature for the third stage of heating is preferably 1950°C, and the heating rate for the third stage of heating is preferably 8°C / min.

[0010] In this invention, the heat preservation process is preferably 90 minutes.

[0011] In this invention, the target temperature of the first stage of cooling is preferably 1450°C, and the cooling rate of the first stage of cooling is preferably 8°C / min; the target temperature of the second stage of cooling is preferably 25-30°C, and the cooling rate of the second stage of cooling is preferably 63°C / min.

[0012] In this invention, the secondary grinding method is preferably air jet milling, and the particle size of the functional material that continuously releases negative oxygen ions is preferably 3-10 nm.

[0013] The present invention also provides a functional material that continuously releases negative oxygen ions prepared by the above preparation method.

[0014] The present invention also provides the application of the above-mentioned functional material that continuously releases negative oxygen ions in the construction industry, medical and health care industry, catering industry, textile industry, water purification or food preservation.

[0015] This invention provides a functional material that continuously releases negative oxygen ions. When applied in the construction industry, it can achieve highly efficient air purification, not only disinfecting and sterilizing, but also degrading harmful substances such as aldehydes, benzenes, and alkanes, and effectively removing PM2.5 dust, smoke, ozone, and other malodorous substances. When applied in the field of water purification, it can simultaneously purify impurities, disinfect, and sterilize, and can also reduce water molecules to small clusters, achieving multiple water purification effects. When applied in the field of food preservation, it can also effectively degrade pesticide residues, improving the quality and safety of food preservation.

[0016] The functional material for continuously releasing negative oxygen ions provided by this invention has a particle size of 3-10 nm, which has the advantage of small particle size and can be applied to a variety of materials. For example, this functional material can be incorporated into building-related substrates such as walls, floors, doors, windows, and furniture, and can achieve continuous release of small-particle-size, high-concentration negative oxygen ions without the application of any external energy, opening up a new track for the development of green building and other fields.

[0017] The present invention has the following beneficial effects: The raw material used in this invention is calcite, which is widely available and has a low cost.

[0018] This invention utilizes a synergistic process of initial grinding, calcination, and secondary grinding to alter the original crystal lattice structure of calcite and create densely packed defect sites. These defects not only alter the electrostatic field distribution but also change the electromagnetic field distribution resulting from charge movement. Consequently, the distribution of the electrostatic field at the crystal interface and the electromagnetic field generated by continuous charge movement undergoes chaotic distortion, producing densely packed active sites that can disrupt charge movement trajectories without the application of any external energy. This allows for the regulation of the electrostatic field distribution at the crystal interface, achieving disordered charge movement trajectories and ultimately producing a functional material that continuously releases high concentrations of negative oxygen ions without external energy stimulation. By controlling the temperature during the heat preservation process to 1900-2000℃, calcite undergoes a solid-to-liquid phase transformation, resulting in a synchronized and regular variation in its microcrystalline structure, leading to various types of crystal defects such as point defects, line defects, and surface defects. When dense defects form at the calcite crystal interface, the intensity and distribution characteristics of its internal micro-electrostatic field undergo substantial changes. Simultaneously, the electromagnetic field generated by charge movement also becomes disordered, directly causing the charge transfer orbits within the crystal to become chaotic and disordered. This disrupts the original ordered migration paths of the charges, causing them to detach from their original orbits and form free electrons. These free electrons are then captured by oxygen atoms in the air, ultimately generating negative oxygen ions. Secondary grinding can increase the lattice defect density of the material by 3-5 times, further enhancing the negative oxygen ion release performance and ensuring the continuous release of negative oxygen ions without any external energy support.

[0019] The functional material for continuously releasing negative oxygen ions obtained by the preparation method of this invention has a lattice defect site density ≥10. 8 pcs / cm 2 The electrostatic field distribution at the crystal interface exhibits disordered characteristics, enabling the sustained release of high-concentration negative oxygen ions with a particle size of 3-10 nm without external energy dependence, achieving a negative oxygen ion release concentration ≥8000 ions / cm³. 3 The released negative oxygen ions can migrate over a distance of 4-5 meters, making it suitable for various application scenarios. In special environments such as the cabins of sea, land, and air vehicles, as well as the enclosed underwater spaces of aircraft carriers, warships, and submarines, it can stably maintain the concentration of negative oxygen ions at 2000-3000 ions / cm³. 3 Furthermore, the concentration can be flexibly adjusted according to the actual needs of different scenarios.

[0020] The functional material for continuously releasing negative oxygen ions, prepared by the method of this invention, releases negative oxygen ions with a particle size of 3-10 nm, which is beneficial for human absorption. It consumes no energy, produces no secondary pollution, and can be applied in multiple fields, such as construction, medical and health care, catering, textiles, water purification, and food preservation. Market demand is broad, and large-scale production is feasible.

[0021] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0022] Figure 1 This is an SEM image of the calcite powder obtained after the initial grinding in Example 2; Figure 2 This is an SEM image of the calcined product obtained after calcination treatment in Example 2; Figure 3 This is a SEM image of the functional material that continuously releases negative oxygen ions prepared in Example 2; Figure 4 This is a schematic diagram of the calcined product obtained after calcination treatment in Example 2. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. Unless otherwise defined, the technical or scientific terms used in this invention should be understood in their ordinary sense by those skilled in the art. The features mentioned above or in the specific examples mentioned in this invention can be combined arbitrarily, and these specific embodiments are only used to illustrate the invention and are not intended to limit the scope of the invention.

[0024] Example 1 This embodiment provides a method for preparing a functional material that continuously releases negative oxygen ions, the process of which is as follows: Calcite is crushed and then first ground to obtain calcite powder with a particle size of 20-30μm. The calcite powder is then calcined and then ground a second time using an air jet mill to obtain a functional material that continuously releases negative oxygen ions with a particle size of 3-10nm. The calcination process is as follows: The temperature was increased from 25℃ to 500℃ at a heating rate of 10℃ / min to complete the first stage of heating. Then, the temperature was increased to 1400℃ at a heating rate of 40℃ / min to complete the second stage of heating. The temperature was then increased to 2000℃ at a heating rate of 10℃ to complete the third stage of heating. The temperature was held at 2000℃ for 80 minutes to complete the holding process. Then, the temperature was decreased to 1500℃ at a cooling rate of 5℃ / min to complete the first stage of cooling. Finally, the temperature was decreased to 25℃ at a cooling rate of 60℃ / min to complete the second stage of cooling.

[0025] Example 2 This embodiment provides a method for preparing a functional material that continuously releases negative oxygen ions, the process of which is as follows: Calcite is crushed and then first ground to obtain calcite powder with a particle size of 1-50μm. The calcite powder is then calcined and then ground a second time using an air jet mill to obtain a functional material with a particle size of 3-10nm that continuously releases negative oxygen ions. The calcination process is as follows: The temperature is increased from 25℃ to 400℃ at a heating rate of 5℃ / min to complete the first stage of heating. Then, the temperature is increased to 1500℃ at a heating rate of 45℃ / min to complete the second stage of heating. The temperature is then increased to 1800℃ at a heating rate of 5℃ to complete the third stage of heating. The temperature is held at 1800℃ for 100 minutes to complete the holding process. Then, the temperature is decreased to 1400℃ at a cooling rate of 10℃ / min to complete the first stage of cooling. Finally, the temperature is decreased to 30℃ at a cooling rate of 65℃ / min to complete the second stage of cooling.

[0026] Example 3 This embodiment provides a method for preparing a functional material that continuously releases negative oxygen ions, the process of which is as follows: Calcite is crushed and then first ground to obtain calcite powder with a particle size of 10-40μm. The calcite powder is then calcined and then ground a second time using an air jet mill to obtain a functional material with a particle size of 3-10nm that continuously releases negative oxygen ions. The calcination process is as follows: The temperature was increased from 25℃ to 450℃ at a heating rate of 8℃ / min to complete the first stage of heating. Then, the temperature was increased to 1450℃ at a heating rate of 42℃ / min to complete the second stage of heating. The temperature was then increased to 1950℃ at a heating rate of 8℃ to complete the third stage of heating. The temperature was held at 1950℃ for 90 minutes to complete the holding process. Then, the temperature was decreased to 1450℃ at a cooling rate of 8℃ / min to complete the first stage of cooling. Finally, the temperature was decreased to 25℃ at a cooling rate of 63℃ / min to complete the second stage of cooling.

[0027] Comparative Example 1 This comparative example provides a method for preparing a functional material that continuously releases negative oxygen ions. The process is basically the same as that in Example 2, except that the cooling treatment is natural cooling.

[0028] Comparative Example 2 This comparative example provides a method for preparing a functional material that continuously releases negative oxygen ions. The preparation process is basically the same as that in Example 2, except that the temperature during the heat preservation process is 1500℃.

[0029] Performance testing: The calcite powder that underwent the initial grinding in Example 2 was observed using SEM, and the results are as follows: Figure 1 As shown. From Figure 1 It can be seen that the calcite powder after the initial grinding exhibits a complete and orderly original crystal structure, without artificially created point defects, line defects, or surface defects, and there are no active sites at the crystal interface.

[0030] The calcined product after calcination treatment in Example 2 was observed by SEM, and the results are as follows: Figure 2 As shown. From Figure 2 It can be seen that after calcination, the original complete crystal structure of the calcite powder has begun to change, and a small number of defects have appeared. This is an intermediate stage of the modification of the crystal structure by high-temperature sintering.

[0031] The functional material that continuously releases negative oxygen ions obtained in Example 2 was observed using SEM, and the results are as follows: Figure 3 As shown. From Figure 3 It can be seen that after secondary grinding, the calcite powder forms a crystalline material powder with a dense and disordered micro-nano-level defect structure inside. This microstructural aspect confirms that the functional material provided by this invention has the structural basis for the self-excited release of negative oxygen ions. The dense defect structure leads to complex and disordered changes in the electrostatic field between the micro-electrodes at the crystal interface and the electromagnetic field formed by charge movement, providing a microstructural guarantee for the ionization of water molecules to generate free electrons, which then combine with oxygen molecules to form negative oxygen ions.

[0032] from Figure 1 , Figure 2 , Figure 3 The changes in the SEM images show that after the initial grinding, calcination, and secondary grinding processes, the crystal microstructure of calcite underwent significant modification and reconstruction, resulting in dense crystal defects (including point defects, line defects, and surface defects, as detailed in the attached diagram) at the crystal interfaces. The presence of these defects causes complex and disordered changes in the electrostatic field between the micro-electrodes at the crystal interfaces and the electromagnetic field generated by charge movement. This leads to irregular dynamic changes in the charge migration orbits within the crystal, causing negative charges in water molecules to detach from their original orbits, ionize, and form free electrons. Therefore, these defect sites can also be defined as active sites, whose core function is to activate negative charges to detach from their original orbits and achieve ionization. When these free electrons are captured by oxygen molecules or oxygen atoms, which make up approximately 21% of the air (although nitrogen has a large proportion in the air, it is an inert gas and cannot combine with negative ions), negative oxygen ions, also known as air negative ions, are formed. The disordered variation of the micro-electric field inside the material gives rise to the aforementioned dense crystal defects, forming a heterostructure of crystals. These defects are the core active sites that activate the ionization of water molecules and generate free electrons. As a result, the material can achieve continuous release of negative oxygen ions without the need for any external energy excitation such as light, radiation, or electric shock. This not only significantly reduces the cost of using the material but also significantly improves the ease of operation in practical applications.

[0033] Example 2: A schematic diagram of the calcined product sample after calcination treatment is shown below. Figure 4 .from Figure 4 It can be seen that calcined ...

[0034] The concentration of negative oxygen ions in the functional materials prepared in Examples 1-3 and Comparative Examples 1-3 was tested according to the GB / T 18801-2015 standard, and the results are shown in Table 1.

[0035] Table 1. Test results of negative oxygen ion concentration

[0036] As can be seen from Table 1, the concentration of negative oxygen ions in the functional materials provided by this invention is ≥8000 ions / cm³. 3 This represents a hundredfold improvement over traditional technologies, reaching medical-grade application standards. The results of Comparative Example 1 show that the cooling method significantly affects the final concentration of negative oxygen ions released by the material. Theoretically, the slow natural cooling rate gradually restores the crystal structure to its original calcite crystal form, greatly suppressing the formation of crystal defects and thus weakening the material's negative oxygen ion release performance. In Comparative Example 2, the lower temperature during the heat preservation process resulted in fewer defects and limited free electron generation, thus leading to a lower concentration of released negative oxygen ions compared to Example 2.

[0037] This description is intended to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and such modifications or equivalent substitutions should not cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a functional material that continuously releases negative oxygen ions, characterized in that, The preparation steps include the following: Calcite is crushed, initially ground, calcined, and then ground a second time to obtain a functional material that continuously releases negative oxygen ions. The calcination process includes a heating process, a heat holding process, and a cooling process performed sequentially. The heating process includes a first stage of heating, a second stage of heating, and a third stage of heating. The target temperature for the first stage of heating is 400-500℃, and the heating rate for the first stage is 5-10℃ / min. The target temperature for the second stage of heating is 1400-1500℃, and the heating rate for the second stage is 40-45℃ / min. The target temperature for the third stage of heating is 1800-2000℃, and the heating rate for the third stage is 5-10℃ / min. The temperature during the heat preservation process is consistent with the target temperature of the third stage of heating, and the heat preservation process lasts for 80-100 minutes. The cooling process includes a first-stage cooling and a second-stage cooling; The target temperature for the first stage of cooling is 1400-1500℃, and the cooling rate for the first stage of cooling is 5-10℃ / min. The target temperature for the second stage of cooling is 25-30℃, and the cooling rate for the second stage of cooling is 60-65℃ / min.

2. The preparation method of the functional material that continuously releases negative oxygen ions according to claim 1, characterized in that, After initial grinding, the particle size of the calcite powder obtained is 1-50 μm.

3. The method for preparing the functional material that continuously releases negative oxygen ions according to claim 1, characterized in that, The target temperature for the first stage of heating is 450℃, and the heating rate for the first stage is 8℃ / min. The target temperature for the second stage of heating is 1450℃, and the heating rate for the second stage is 42℃ / min. The target temperature for the third stage of heating is 1950℃, and the heating rate for the third stage is 8℃ / min.

4. The preparation method of the functional material that continuously releases negative oxygen ions according to claim 1, characterized in that, The heat preservation process lasts for 90 minutes.

5. The method for preparing the functional material that continuously releases negative oxygen ions according to claim 1, characterized in that, The target temperature for the first stage of cooling is 1450℃, and the cooling rate for the first stage of cooling is 8℃ / min. The target temperature for the second stage of cooling is 25-30℃, and the cooling rate for the second stage of cooling is 63℃ / min.

6. The method for preparing the functional material that continuously releases negative oxygen ions according to claim 1, characterized in that, The particle size of the functional material that continuously releases negative oxygen ions is 3-10 nm.

7. A functional material that continuously releases negative oxygen ions, prepared by the method for preparing a functional material that continuously releases negative oxygen ions according to any one of claims 1-6.

8. The application of the functional material for continuously releasing negative oxygen ions as described in claim 7 in the construction industry, medical and health care industry, catering industry, textile industry, water purification or food preservation.

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