Nanotourmaline composite material, preparation method and application thereof

Abstract

This application relates to the field of tourmaline materials technology, disclosing a nano-tourmaline composite material, its preparation method, and its applications. The preparation method includes: uniformly mixing copper powder, copper oxide powder, and a solvent, followed by a first ball milling process to obtain a copper-containing mixed slurry; adding tourmaline powder to the copper-containing mixed slurry, followed by a second ball milling process to obtain a tourmaline-containing mixed slurry; and subjecting the tourmaline-containing mixed slurry to vacuum drying and grinding to obtain a nano-tourmaline / cuprous oxide composite material. The preparation process of this application is simple, requiring only ball milling and vacuum drying, without the need for ultrasonic dispersion or high-temperature and high-pressure treatment. The required raw materials are readily available, eliminating the need for various other chemical additives, thus avoiding environmental pollution and effectively reducing energy consumption. Simultaneously, it effectively enhances the negative ion emission performance of tourmaline, exhibiting significant health-promoting and antibacterial effects.

Description

Technical Field

[0001] This application relates to the field of tourmaline materials technology, such as a nano-tourmaline composite material and its preparation method and application. Background Technology

[0002] Negative ions, often called "vitamins of the air," are formed by attaching to air molecules with free electrons. They are a general term for negatively charged gas molecules and ions. Negative (oxygen) ions can adsorb dust, mold spores, and other allergens in the air, and can be used for air purification and medical treatment, offering significant health benefits. To improve people's living environment, negative ion-related products have gained considerable attention.

[0003] Tourmaline is a natural borosilicate mineral with properties such as spontaneous polarization, piezoelectricity, pyroelectricity, infrared radiation emission, and negative ion release. It is widely used in electronic devices, catalysts, energy storage, building materials, ceramics, and textiles. However, tourmaline powder itself has relatively large particles and low self-polarization efficiency, resulting in low negative ion emission and limiting its widespread application.

[0004] To improve the performance of tourmaline, it is currently possible to mix tourmaline with various components, such as dispersants, solubilizers, and chelating agents. However, during the preparation process, the mixed slurry formed by tourmaline and various components needs to undergo multiple ultrasonic dispersion and stirring, high temperature and high pressure treatment, and other calcination processes. The preparation process is relatively complex, and the various added components pollute the environment. Furthermore, the amount of negative ions released by tourmaline materials formed based on the above methods is still limited.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a nano-tourmaline composite material, its preparation method, and its application, to simplify the preparation process of the nano-tourmaline composite material and increase the amount of negative ions released by the tourmaline material.

[0008] In some embodiments, the method for preparing the nano-tourmaline composite material includes:

[0009] Copper powder, copper oxide powder and solvent are mixed evenly and then subjected to a first ball milling process to obtain a copper-containing mixed slurry.

[0010] Tourmaline powder was added to the copper-containing mixed slurry, and the mixture was subjected to a second ball milling process to obtain a tourmaline-containing mixed slurry.

[0011] The tourmaline-containing slurry was vacuum dried and ground to obtain a nano-tourmaline / cuprous oxide composite material.

[0012] Optionally, the copper has a mass fraction of 10%-60%, and the copper oxide has a mass fraction of 10%-70%.

[0013] Optionally, the solvent is deionized water, and the solvent content ranges from 5 to 30 mL.

[0014] Optionally, the tourmaline has a mass fraction of 20%-80%.

[0015] Optionally, the time range for the first ball milling treatment is 30-70 hours.

[0016] Optionally, the second ball milling process can be performed for 10-25 hours.

[0017] Optionally, the vacuum drying temperature range is 30-90℃, and the time range is 10-30h.

[0018] Optionally, the grain size range of the nano-tourmaline / cuprous oxide composite material is 100-700 nm, and the particle size D50≤500 nm or D97≤700 nm.

[0019] In some embodiments, the nano-tourmaline composite material is prepared using the preparation method described in this application.

[0020] In some embodiments, the application of the nano-tourmaline composite material involves applying the nano-tourmaline composite material described in this application to one or more of textiles, water purification, air purification, or functional coatings.

[0021] The nano-tourmaline composite material, its preparation method, and its application provided in this disclosure can achieve the following technical effects:

[0022] The preparation process described in this application is simple, requiring only ball milling and vacuum drying, without the need for ultrasonic dispersion or high-temperature and high-pressure treatment. Secondly, the required raw materials are readily available, eliminating the need for various other chemical additives, thus avoiding environmental pollution and effectively reducing energy consumption. Simultaneously, it effectively enhances the negative ion emission performance of tourmaline, exhibiting significant health-promoting and antibacterial effects.

[0023] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0024] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0025] Figure 1 This is a schematic flowchart of a nano-tourmaline composite material and its preparation method according to this application. Detailed Implementation

[0026] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0027] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0028] Unless otherwise stated, the term "multiple" means two or more.

[0029] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0030] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0031] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0032] Combination Figure 1 As shown, this disclosure provides a nano-tourmaline composite material and its preparation method, including the following steps:

[0033] S110. Copper powder, copper oxide powder and solvent are mixed evenly and then subjected to a first ball milling process to obtain a copper-containing mixed slurry.

[0034] Specifically, copper powder and copper oxide powder in different proportions are weighed, and the weighed copper powder and copper oxide powder are mixed with solvent at room temperature, and then wet ball milled in a ball mill jar for 30-70 hours to obtain a copper-containing mixed slurry.

[0035] It should be understood that the mechanochemical reactions generated by ball milling are mainly caused by lattice defects and distortions, newly formed surfaces, atomic groups, and the generation of externally excited electrons. Under mechanical conditions, after ball milling for more than 30 hours, copper reacts with copper oxide to form cuprous oxide. After ball milling for more than 60 hours, the content of cuprous oxide increases significantly. In other words, within the ball milling range of 30-70 hours, the obtained copper-containing mixed slurry includes cuprous oxide, copper, and copper oxide. As the ball milling time increases, the content of cuprous oxide gradually increases, while the contents of copper and copper oxide gradually decrease.

[0036] In some other preferred embodiments, the mass percentage of copper is 10%-60%, the mass percentage of copper oxide is 10%-70%, and the purity of copper and copper oxide is above 99%. The composite material formed within this range has a high negative ion emission.

[0037] As a further preferred option, the mass ratio of copper to copper oxide is 1:1.2.

[0038] In some other preferred embodiments, deionized water is used as the solvent, and its content ranges from 5 to 30 mL. The amount used is small, and there is no need to use toxic or harmful organic reagents, making it safer, more reliable, and environmentally friendly.

[0039] In some other preferred embodiments, in step S110, the ball-to-material ratio in the ball milling process is 1:3, the ball milling jar is a stainless steel jar, the mass percentage of the grinding balls is 50%-200%, and the rotation speed of the ball milling process is 200-400 r / min.

[0040] S120. Tourmaline powder is added to the copper-containing mixed slurry, and the mixture is subjected to a second ball milling process to obtain a tourmaline-containing mixed slurry.

[0041] It should be understood that since the initial ball milling process lasts 30-70 hours, cuprous oxide is continuously generated within this timeframe. Therefore, by adding tourmaline powder during cuprous oxide formation, and then continuing to ball mill the copper-containing slurry with the tourmaline powder for another 10-25 hours, a physical reaction occurs between the tourmaline and the generated cuprous oxide, allowing the cuprous oxide to adhere more effectively to the tourmaline. In other words, mixing tourmaline with the generated cuprous oxide during ball milling increases the amount of cuprous oxide adhering to it.

[0042] Meanwhile, cuprous oxide has photocatalytic properties and can generate electrons and holes using the photovoltaic effect of semiconductors. The recombination of photogenerated electron-hole pairs in cuprous oxide is relatively fast. However, after the addition of tourmaline powder, under the action of an electric field, some electrons are forced to move directionally with the direction of the electric field, further reducing the recombination probability. That is, the reduction in the electron-hole recombination probability results in a large amount of energy accumulating on the surface of the tourmaline / cuprous oxide composite powder to dissociate air molecules, thereby generating a high concentration of negative air ions to increase the negative ion emission of tourmaline.

[0043] In some preferred embodiments, the mass fraction of tourmaline is 20%-80%, and the tourmaline is one or more of iron tourmaline, magnesium tourmaline, iron-magnesium tourmaline, and lithium tourmaline.

[0044] As a further preferred option, the mass fraction of tourmaline can preferably be 25%-75%.

[0045] In some other preferred embodiments, in step S120, the ball milling process is the same as in step S110, that is, the ball-to-material ratio is 1:3, the ball milling jar is a stainless steel jar, the mass percentage of the grinding balls is 50%-200%, and the rotation speed of the ball milling process is 200-400 r / min. The above ball-to-material ratio can give the composite material a good crystal structure and improve its stability. When the ball-to-material ratio increases, it will destroy the original crystal structure of the powder to a certain extent, resulting in a decrease in the stability of the composite material.

[0046] S130. The tourmaline-containing mixed slurry is vacuum dried and ground to obtain a nano-tourmaline / cuprous oxide composite material.

[0047] Specifically, the ball-milled slurry is quickly removed from the ball mill jar and vacuum-dried in a vacuum dryer at a temperature of 30-90°C for 10-30 hours. After drying, the powder is ground to obtain a composite powder, namely, a nano-tourmaline / cuprous oxide composite material.

[0048] Furthermore, in this embodiment, the resulting tourmaline / cuprous oxide composite material has a grain size of approximately 100-700 nm, with a particle size of D50≤500 nm or D97≤700 nm. Tourmaline / cuprous oxide composite materials of this size have a high negative ion emission.

[0049] In this embodiment, copper oxide, copper, solvent and tourmaline are mixed by wet ball milling. Under mechanical force, copper and copper oxide react chemically to generate cuprous oxide. During the formation of cuprous oxide, tourmaline is added and ball milling continues, so that different powders undergo physical and chemical reactions. The generated cuprous oxide adheres better to the surface of tourmaline to form a tourmaline / cuprous oxide composite material.

[0050] The preparation process described in this application is simple, requiring only ball milling and vacuum drying, without the need for ultrasonic dispersion or high-temperature and high-pressure treatment. Secondly, the required raw materials are readily available, eliminating the need for various other chemical additives, thus avoiding environmental pollution and effectively reducing energy consumption. Simultaneously, it effectively enhances the negative ion emission performance of tourmaline, exhibiting significant health-promoting and antibacterial effects.

[0051] Another aspect of this application provides a nano-tourmaline composite material, which is prepared by the method described above. For the specific preparation process, please refer to the description above, and it will not be repeated here.

[0052] The nano-tourmaline composite material provided in this application has the properties of highly efficient emission of negative oxygen ions and far-infrared rays, as well as health care and antibacterial effects, with the negative ion content reaching 1647 ions / cm³. 3 .

[0053] Another aspect of this application provides an application of a nano-tourmaline composite material, which, based on its highly efficient negative ion and far-infrared radiation as well as antibacterial properties, can be widely used in one or more of textiles, water purification, air purification, functional coatings, or building materials.

[0054] For example, when the negative ion emissivity reaches 1000 ions / cm 3 When the tourmaline powder is used to purify the air, the negative oxygen ions can adsorb dust, mold spores and other allergens in the air, which is beneficial to improving the living environment.

[0055] The preparation method and product performance of the nano-tourmaline composite material of this application will be further illustrated below with reference to several specific embodiments:

[0056] Example 1

[0057] In this example, the raw material formulation for the nano-tourmaline composite material is 4g copper, 5g copper oxide, 2g tourmaline, and 10mL deionized water. The preparation method includes the following steps:

[0058] S1. At room temperature, 4g of copper powder, 5g of copper oxide powder and 10mL of deionized water are mixed evenly in a ball mill jar with a ball-to-material ratio of 1:3 and a rotation speed of 300r / min. After ball milling for 50h, a copper-containing mixed slurry is obtained.

[0059] S2. Add 2g of tourmaline to the ball mill jar, mix the tourmaline with the copper-containing slurry, and continue ball milling for 20 hours to obtain the mixed slurry.

[0060] S3. Quickly remove the ball-milled slurry, vacuum dry it at 60°C, and then pulverize and grind it into powder to obtain nano-tourmaline / cuprous oxide composite material.

[0061] Furthermore, the negative ion release of the 5g nano-tourmaline / cuprous oxide composite material obtained in Example 1 was measured, as shown in Table 1 below. The negative ion release was 750 ions / cm³. 3 .

[0062] Example 2

[0063] In this example, the raw material formulation for the nano-tourmaline composite material is 4g copper, 5g copper oxide, 3g tourmaline, and 10mL deionized water. The preparation method includes the following steps:

[0064] S1. At room temperature, mix 4g of copper powder, 5g of copper oxide powder and 10mL of deionized water in a ball mill jar. The ball-to-material ratio is 1:3, the rotation speed is 300r / min, and the ball milling process is carried out for 50h to obtain a copper-containing mixed slurry.

[0065] S2. Add 3g of tourmaline to the ball mill jar. Mix the tourmaline with the copper-containing slurry and continue ball milling for 20 hours to obtain the mixed slurry.

[0066] S3. Quickly remove the ball-milled slurry, vacuum dry it at 60°C, and then pulverize and grind it into powder to obtain nano-tourmaline / cuprous oxide composite material.

[0067] Furthermore, the negative ion release of the 5g nano-tourmaline / cuprous oxide composite material obtained in Example 2 was measured, as shown in Table 1 below. The negative ion release was 802 ions / cm³. 3 .

[0068] Example 3

[0069] In this example, the raw material formulation for the nano-tourmaline composite material is 4g copper, 5g copper oxide, 5g tourmaline, and 10mL deionized water. The preparation method includes the following steps:

[0070] S1. At room temperature, mix 4g of copper powder, 5g of copper oxide powder and 10mL of deionized water in a ball mill jar. The ball-to-material ratio is 1:3, the rotation speed is 300r / min, and the ball milling process is carried out for 50h to obtain a copper-containing mixed slurry.

[0071] S2. Add 5g of tourmaline to the ball mill jar, mix the tourmaline with the copper-containing slurry, and continue ball milling for 20 hours to obtain the mixed slurry.

[0072] S3. Quickly remove the ball-milled slurry, vacuum dry it at 60°C, and then pulverize and grind it into powder to obtain nano-tourmaline / cuprous oxide composite material.

[0073] Furthermore, the negative ion release of the 5g nano-tourmaline / cuprous oxide composite material obtained in Example 3 was measured, as shown in Table 1 below. The negative ion release was 10¹⁶ ions / cm³. 3 .

[0074] Example 4

[0075] In this example, the raw material formulation for the nano-tourmaline composite material is 4g of copper, 5g of copper oxide, 10g of tourmaline, and 15mL of deionized water. The preparation method includes the following steps:

[0076] S1. At room temperature, 4g of copper powder, 5g of copper oxide powder and 15mL of deionized water are mixed evenly in a ball mill jar with a ball-to-material ratio of 1:3 and a rotation speed of 300r / min. The mixture is ball-milled for 50h to obtain a copper-containing slurry.

[0077] S2. Add 10g of tourmaline to the ball mill jar, mix the tourmaline with the copper-containing slurry, and continue ball milling for 20 hours to obtain a mixed slurry.

[0078] S3. Quickly remove the ball-milled slurry, vacuum dry it at 60°C, and then pulverize and grind it into powder to obtain nano-tourmaline / cuprous oxide composite material.

[0079] Furthermore, the negative ion release of the 5g nano-tourmaline / cuprous oxide composite material obtained in Example 4 was measured, as shown in Table 1 below. The negative ion release was 1647 ions / cm³. 3 .

[0080] Example 5

[0081] In this example, the raw material formulation for the nano-tourmaline composite material is 4g copper, 5g copper oxide, 15g tourmaline, and 20mL deionized water. The preparation method includes the following steps:

[0082] S1. At room temperature, mix 4g of copper powder, 5g of copper oxide powder and 20mL of deionized water in a ball mill jar. The ball-to-material ratio is 1:3, the rotation speed is 300r / min, and the ball milling process is carried out for 50h to obtain a copper-containing mixed slurry.

[0083] S2. Add 15g of tourmaline to the ball mill jar, mix the tourmaline with the copper-containing slurry, and continue ball milling for 20 hours to obtain the mixed slurry.

[0084] S3. Quickly remove the ball-milled slurry, vacuum dry it at 60°C, and then pulverize and grind it into powder to obtain nano-tourmaline / cuprous oxide composite material.

[0085] Furthermore, the negative ion release of the 5g nano-tourmaline / cuprous oxide composite material obtained in Example 5 was measured, as shown in Table 1 below. The negative ion release was 1421 ions / cm³. 3 .

[0086] Example 6

[0087] In this example, the raw material formulation for the nano-tourmaline composite material is 4g of copper, 5g of copper oxide, 20g of tourmaline, and 25mL of deionized water. The preparation method includes the following steps:

[0088] S1. At room temperature, 4g of copper powder, 5g of copper oxide powder and 25mL of deionized water are mixed evenly in a ball mill jar with a ball-to-material ratio of 1:3 and a rotation speed of 300r / min. The mixture is ball-milled for 50h to obtain a copper-containing slurry.

[0089] S2. Add 20g of tourmaline to the ball mill jar, mix the tourmaline with the copper-containing slurry, and continue ball milling for 20 hours to obtain a mixed slurry.

[0090] S3. Quickly remove the ball-milled slurry, vacuum dry it at 60°C, and then pulverize and grind it into powder to obtain nano-tourmaline / cuprous oxide composite material.

[0091] Furthermore, the negative ion release of the 5g nano-tourmaline / cuprous oxide composite material obtained in Example 6 was measured, as shown in Table 1 below. The negative ion release was 1255 ions / cm³. 3 .

[0092] Example 7

[0093] In this example, the raw material formulation for the nano-tourmaline composite material is 4g copper, 5g copper oxide, 25g tourmaline, and 30mL deionized water. The preparation method includes the following steps:

[0094] S1. At room temperature, mix 4g of copper powder, 5g of copper oxide powder and 30mL of deionized water in a ball mill jar. The ball-to-material ratio is 1:3, the rotation speed is 300r / min, and the ball milling process is carried out for 50h to obtain a copper-containing mixed slurry.

[0095] S2. Add 25g of tourmaline to the ball mill jar, mix the tourmaline with the copper-containing slurry, and continue ball milling for 20 hours to obtain the mixed slurry.

[0096] S3. Quickly remove the ball-milled slurry, vacuum dry it at 60°C, and then pulverize and grind it into powder to obtain nano-tourmaline / cuprous oxide composite material.

[0097] Furthermore, the negative ion release of the 5g nano-tourmaline / cuprous oxide composite material obtained in Example 7 was measured, as shown in Table 1 below. The negative ion release was 1060 ions / cm³. 3 .

[0098] In summary, as shown in Examples 1-4, the negative ion release gradually increases with the increase of tourmaline content. This is because with the increase of tourmaline powder, the free cuprous oxide powder adheres better to the tourmaline surface, thereby reducing the probability of electron-hole recombination under the photocatalytic effect of cuprous oxide and accumulating more energy for dissociating air molecules, thus increasing the negative ion release. Furthermore, as shown in Examples 4-7, although the tourmaline content increases, the negative ion release gradually decreases. This is because when cuprous oxide powder cannot fully adhere to the tourmaline surface, the tourmaline powder will agglomerate, resulting in a decrease in the specific surface area of ​​tourmaline in contact with air, and thus failing to ionize water molecules in the air more effectively.

[0099] Comparative Example 1

[0100] 5g of unmilled tourmaline powder was used as control group 1. The negative ion release was measured, and the results are shown in Table 1 below. The negative ion release was 1097 ions / cm³. 3 .

[0101] Compared to Example 3, 5g of tourmaline, 4g of copper powder, and 5g of copper oxide powder were wet-ball-milled to form a 14g tourmaline / cuprous oxide composite material. When 5g of powder was taken from the 14g composite material, it was equivalent to only 1.78g of tourmaline in that 5g of powder, and its negative ion release was 10¹⁶ ions / cm³. 3 This essentially achieves the negative ion release rate of 5g of untreated tourmaline (1097 ions / cm³). 3 This indicates that the method of the present invention can effectively increase the amount of negative ions released by tourmaline.

[0102] Comparative Example 2

[0103] Tourmaline slurry, wet-milled for 20 hours, was vacuum dried and ground into powder, serving as control group 2. 5g of the ground tourmaline powder was tested for negative ion release, as shown in Table 1 below. The negative ion release was 1297 ions / cm³. 3 .

[0104] Comparative Example 3

[0105] Cuprous oxide (9g) and tourmaline (10g) were mixed and wet-ball-milled for 20h, then vacuum-dried and ground into powder to obtain a tourmaline / cuprous oxide composite material, which served as control group 3. 5g of the formed tourmaline / cuprous oxide composite powder was used for negative ion release testing, as shown in Table 1 below. The negative ion release was 1395 ions / cm³. 3 .

[0106] Compared to Example 4, the composite material formed by directly mixing cuprous oxide and tourmaline exhibits a significantly lower negative ion release than the composite material proposed in this invention. This indicates that by mixing copper oxide, copper, and tourmaline and wet ball milling, the cuprous oxide generated during the ball milling process can better adhere to the tourmaline surface. Furthermore, based on the photocatalytic effect of the cuprous oxide generated in the reaction, after adding tourmaline powder, some electrons are forced to move directionally with the electric field under the influence of the electric field, further reducing the recombination probability. This reduction in the electron-hole recombination probability results in a large accumulation of energy on the surface of the tourmaline / cuprous oxide composite powder, leading to a high concentration of negative air ions and effectively increasing the negative oxygen ion release from the tourmaline.

[0107] The negative ion release amounts of the nano-tourmaline composite materials obtained in each embodiment and comparative example are shown in Table 1 below:

[0108] Table 1

[0109]

[0110] This application proposes a nano-tourmaline composite material, its preparation method, and its application, which has the following beneficial effects: The preparation method of this invention is simple, requiring only simple ball milling and vacuum drying steps, without the need for high temperature and high pressure treatment, effectively simplifying the preparation process; furthermore, the raw material components of this application are simple, without the need to add multiple components, and the resulting composite material has a high efficiency in negative ion release, far-infrared radiation, and antibacterial effects.

[0111] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0112] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0113] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0114] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for preparing a nano-tourmaline composite material, characterized in that, include: Copper powder, copper oxide powder and solvent are mixed evenly, and then subjected to a first ball milling treatment at a ball-to-material ratio of 1:3 and a rotation speed of 200-400 r / min to generate cuprous oxide in situ from copper powder and copper oxide, thus obtaining a copper-containing mixed slurry. Tourmaline powder is added to the copper-containing mixed slurry, and the mixture is subjected to a second ball milling treatment at a ball-to-material ratio of 1:3 and a rotation speed of 200-400 r / min. During the formation of cuprous oxide, cuprous oxide is attached to the surface of tourmaline in situ, resulting in a tourmaline-containing mixed slurry. The tourmaline-containing slurry was vacuum dried and ground to obtain a nano-tourmaline / cuprous oxide composite material; The nano-tourmaline / cuprous oxide composite material has a grain size range of 100-700 nm, a particle size D50 ≤ 500 nm or D97 ≤ 700 nm, and a negative ion release of ≥ 1000 ions / cm³. 3 .

2. The preparation method according to claim 1, characterized in that, The copper powder has a mass fraction of 10%-60%, and the copper oxide powder has a mass fraction of 10%-70%.

3. The preparation method according to claim 1, characterized in that, The solvent is deionized water, and the concentration of the solvent ranges from 5 to 30 mL.

4. The preparation method according to claim 1, characterized in that, The mass fraction of tourmaline is 20%-80%.

5. The preparation method according to claim 1, characterized in that, The time range for the first ball milling treatment is 30-70 hours.

6. The preparation method according to claim 1, characterized in that, The second ball milling process takes 10-25 hours.

7. The preparation method according to claim 6, characterized in that, The vacuum drying temperature range is 30-90℃, and the time range is 10-30h.

8. A nano-tourmaline composite material, characterized in that, It is prepared by the preparation method described in any one of claims 1 to 7.

9. The application of the nano-tourmaline composite material as described in claim 8 in textiles, water purification, air purification, or functional coatings.

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