Material capable of stably emitting microwaves and negative ions and application thereof

Abstract

The invention provides a material capable of stably emitting microwaves and negative ions and application of the material. The material comprises ceramic particles and a functional film layer on the surfaces of the ceramic particles. The functional film layer comprises mineral powder and lithium salt; wherein the thickness of the functional film layer is 60-300 microns. The material capable of stably emitting the microwaves and the negative ions can stably emit the microwaves and the negative ions, so that the material has excellent antibacterial and bacteriostatic performance.

Description

Technical Field

[0001] This application relates to the technical field of microwave-emitting materials, and particularly to a material capable of stably emitting microwaves and negative ions and its applications. Background Art

[0002] Ceramics are ideal microwave dielectric materials due to the designability of their resonant frequency temperature coefficients and the diversity of their dielectric constants. In recent years, researchers have achieved microwave dielectric materials with low resonant frequency temperature coefficients by adding multiple ceramic materials with opposite resonant frequency temperature coefficients for regulation.

[0003] With the development of information technology, especially the evolution from 5G to 6G technology, the demand for microwave dielectric materials has further increased. They also have important applications in frontier technology fields such as intelligent driving, electric vehicles, and smart cities.

[0004] However, with the improvement of people's quality of life, if ceramic materials can decompose harmful substances, it can improve people's health and further enhance the application of ceramic materials. Summary of the Invention

[0005] This application provides a material capable of stably emitting microwaves and negative ions and its applications, aiming to solve the technical problems in the prior art that ceramic materials cannot stably release negative ions, making them unable to effectively inhibit and antibacterial as microwave dielectric materials, and restricting their application scope.

[0006] In a first aspect, this application provides a material capable of stably emitting microwaves and negative ions, including: Ceramic particles and a functional film layer on the surface of the ceramic particles; The functional film layer includes mineral powder and lithium salt; wherein, the thickness of the functional film layer is 60 - 300 microns.

[0007] In a possible implementation manner, the mineral powder includes at least one of qibingshi, tourmaline, medical stone, gui yang stone, agate, feldspar or mica; And / or, the lithium salt includes at least one of lithium niobate or magnesium lithium niobate; And / or, the ceramic particles include at least one of strontium titanate, barium titanate or calcium titanate.

[0008] In a possible implementation manner, the ceramic particles account for 50% - 70% of the total mass of the material; And / or, the functional film layer accounts for 30% - 50% of the total mass of the material; in the functional film layer, the mass ratio of the mineral powder to the lithium salt is (1 - 2):(0.3 - 0.6).

[0009] In a possible implementation, the particle size of the ceramic particles is 10 to 1000 microns; and / or, the particle size of the mineral powder is 10 to 100 microns; and / or, the particle size of the lithium salt is 10 to 100 microns.

[0010] In a possible implementation, the functional film layer further includes carbon particles; The raw material of the carbon particles includes at least one of polyvinylpyrrolidone, Tween 80 (polysorbate - 80), or polyvinyl alcohol.

[0011] In a possible implementation, the mass of the carbon particles accounts for 22% to 40% of the functional film layer.

[0012] In a second aspect, the present application provides a method for preparing a material capable of stably emitting microwaves and negative ions, including the following steps: Adding ceramic particles to a solution containing an additive, stirring and mixing evenly to obtain a first slurry; After drying the first slurry, obtaining first particles; Adding the first particles, mineral powder, and lithium salt to a solution containing an additive, stirring and mixing evenly to obtain a second slurry; Drying, direct current polarization, and calcining the second slurry to obtain the material; wherein, the additive includes at least one of polyvinylpyrrolidone, Tween 80 (polysorbate - 80), or polyvinyl alcohol.

[0013] In a possible implementation, the direct current polarization is carried out at an electric field strength of 1.5 kV / mm to 3 kV / mm and a polarization time of 6 min to 12 min; and / or, the calcining is carried out at a heating rate of 1.5 °C / min to 2.5 °C / min to a temperature of 800 °C to 1000 °C and held for 1 h to 4 h.

[0014] In a possible implementation, the mass fraction of the polyvinyl alcohol solution is 3% to 7%; and / or, the solution includes at least one of water, ethanol, or methanol.

[0015] In a third aspect, the present application provides an application of the material capable of stably emitting microwaves and negative ions according to any one of the implementation manners of the first aspect of the present application, and / or the material capable of stably emitting microwaves and negative ions prepared by the preparation method according to any one of the implementation manners of the second aspect of the present application, which is applied to the fields of communication, construction, or environmental protection.

[0016] The material capable of stably emitting microwaves and negative ions provided by the present application has the following beneficial effects: In this application, a functional film layer is coated on the surface of ceramic particles. The functional film layer includes mineral powder and lithium salt, and the thickness of the functional film layer is set to be 60 - 300 microns. This material has a core - shell structure, in which the ceramic material with a lower dielectric constant and dielectric loss is coated in the functional film layer. Moreover, the mineral powder and lithium salt in the functional film layer can stably emit negative ions, endowing it with antibacterial and bacteriostatic properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0018] Figure 1 It is a flowchart of a preparation method for a material that can stably emit microwaves and negative ions provided for an embodiment of this application.

[0019] Through the above - mentioned drawings, specific embodiments of this application have been shown, and there will be more detailed descriptions hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Here, the exemplary embodiments will be described in detail, and their examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. On the contrary, they are merely examples of devices and methods consistent with some aspects of this application as detailed in the appended claims.

[0021] This application provides a material that can stably emit microwaves and negative ions, including: ceramic particles, and a functional film layer on the surface of the ceramic particles; the functional film layer includes mineral powder and lithium salt; wherein, the thickness of the functional film layer is 60 - 300 microns.

[0022] This material has a core - shell structure, the core is the ceramic material, and the shell is the functional film layer. Defining the thickness of the functional film layer can keep the dielectric properties of the core ceramic material stable, thereby making the material have a lower dielectric constant and dielectric loss; at the same time, the mineral powder and lithium salt in the functional film layer can stably release negative ions, making the material also have excellent antibacterial and bacteriostatic properties. Of course, the thickness of the functional film layer can be any value among 60 microns, 100 microns, 150 microns, 200 microns or 300 microns or any value between any two of them.

[0023] Further, in this embodiment, the mineral powder includes at least one of qibingshi, tourmaline, medical stone, Guiyang stone, agate, feldspar or mica.

[0024] Further, in this embodiment, the lithium salt includes at least one of lithium niobate or magnesium lithium niobate.

[0025] Further, in this embodiment, the ceramic particles include at least one of strontium titanate, barium titanate or calcium titanate. By constructing a core-shell structure to form a three-dimensional spatial structure, the internal electric field distribution of the core-shell structure material with microwaves can be further optimized, reducing the dielectric constant, dielectric loss of the overall material and changing the negative ion release effect; and strontium titanate, barium titanate or calcium titanate in this ceramic material can regulate the dielectric temperature stability of the overall material, making the material a microwave dielectric material with low-loss temperature stability; at the same time, the three-dimensional structure of this material can make the negative ion release more stable and has excellent negative ion release performance.

[0026] Further, in this embodiment, the ceramic particles account for any one or any value between any two of 50%, 55%, 60%, 65% or 70% of the total mass of the material.

[0027] Further, in this embodiment, the functional film layer accounts for any one or any value between any two of 30%, 35%, 40%, 45% or 50% of the total mass of the material.

[0028] Further, in this embodiment, in the functional film layer, the mass ratio of the mineral powder to the lithium salt is (1 to 2):(0.3 to 0.6).

[0029] Further, in this embodiment, the particle size of the ceramic particles is any one or any value between any two of 10 microns, 20 microns, 30 microns, 50 microns, 100 microns, 200 microns, 500 microns or 1000 microns.

[0030] Further, in this embodiment, the particle size of the mineral powder is any one or any value between any two of 10 microns, 20 microns, 50 microns, 60 microns or 100 microns.

[0031] Further, in this embodiment, the particle size of the lithium salt is any one or any value between any two of 10 microns, 20 microns, 40 microns, 50 microns, 80 microns or 100 microns.

[0032] Further, in this embodiment, the functional film layer further includes carbon particles.

[0033] Further, in this embodiment, the raw material of the carbon particles includes at least one of polyvinylpyrrolidone, Tween 80 (polysorbate-80) or polyvinyl alcohol.

[0034] Furthermore, in this embodiment, the mass of the carbon particles accounts for any one or any value between any two of 22%, 30%, 35% or 40% of the functional film layer.

[0035] Such as Figure 1 It is a flowchart of a preparation method of a material capable of stably emitting microwaves and negative ions. Such as Figure 1 As shown, the present application provides a preparation method of a material capable of stably emitting microwaves and negative ions, including the following steps: S101. Add ceramic particles into a solution containing an additive, stir and mix evenly to obtain a first slurry.

[0036] S102. After drying the first slurry, obtain first particles.

[0037] S103. Add the first particles, mineral powder and lithium salt into a solution containing an additive, stir and mix evenly to obtain a second slurry.

[0038] S104. Dry, directly current polarize and calcine the second slurry to obtain the material.

[0039] Wherein, the additive includes at least one of polyvinylpyrrolidone, Tween 80 (polysorbate - 80) or polyvinyl alcohol.

[0040] Furthermore, in this embodiment, the direct current polarization is carried out at an electric field strength of 1.5 kV / mm to 3 kV / mm and a polarization time of 6 min to 12 min.

[0041] Furthermore, in this embodiment, the calcination is carried out at a heating rate of 1.5 °C / min to 2.5 °C / min to 900 °C to 1000 °C and kept warm for 1 h to 4 h.

[0042] Furthermore, in this embodiment, the mass fraction of the polyvinyl alcohol solution is 3% to 7%; Furthermore, in this embodiment, the solution includes at least one of water, ethanol or methanol.

[0043] The present application also provides an application of the material capable of stably emitting microwaves and negative ions according to any one of the implementation manners of the first aspect of the present application, and / or the material capable of stably emitting microwaves and negative ions prepared by the preparation method according to any one of the implementation manners of the second aspect of the present application, which is applied to the fields of communication, construction or environmental protection. Example 1

[0044] A preparation method of a material capable of stably emitting microwaves and negative ions, including the following steps: S101. Add strontium titanate and barium titanate ceramic particles in a mass ratio of 1:1 to ethanol and water with a volume ratio of 1:1 containing polyvinylpyrrolidone, stir and mix evenly to obtain a first slurry.

[0045] S102. After spray-drying the first slurry, obtain first particles.

[0046] S103. Add the first particles, mica and lithium magnesium niobate in a mass ratio of 1:0.3 to ethanol and water with a volume ratio of 1:1 containing polyvinylpyrrolidone, stir and mix evenly to obtain a second slurry.

[0047] S104. Spray-dry the second slurry, perform DC polarization at an electric field strength of 1.5 kV / mm, and calcine at 800 °C for 1 h to obtain a material. Among them, the first particles account for 66% of the material; in this example, the thickness of the functional film layer is 300 microns, and the mass of carbon particles in the functional film layer accounts for 26% of the functional film layer. Example 2

[0048] A preparation method of a material capable of stably emitting microwaves and negative ions, comprising the following steps: S101. Add strontium titanate and calcium titanate ceramic particles in a mass ratio of 1:1.05 to ethanol and water with a volume ratio of 1:1 containing 7% polyvinyl alcohol, stir and mix evenly to obtain a first slurry.

[0049] S102. After spray-drying the first slurry, obtain first particles.

[0050] S103. Add the first particles, tourmaline and lithium magnesium niobate in a mass ratio of 1.7:0.5 to ethanol and water with a volume ratio of 1:1 containing 7% polyvinyl alcohol, stir and mix evenly to obtain a second slurry.

[0051] S104. Spray-dry the second slurry, perform DC polarization at an electric field strength of 1.4 kV / mm, and calcine at 1000 °C for 1 h to obtain a material. Among them, the first particles account for 67% of the material; in this example, the thickness of the functional film layer is 280 microns, and the mass of carbon particles in the functional film layer accounts for 36% of the functional film layer. Example 3

[0052] A preparation method of a material capable of stably emitting microwaves and negative ions, comprising the following steps: S101. Add strontium titanate and barium titanate ceramic particles in a mass ratio of 1:1 to ethanol and water with a volume ratio of 1:1 containing Tween 80 (polysorbate-80), stir and mix evenly to obtain a first slurry.

[0053] S102. After spray-drying the first slurry, obtain first particles.

[0054] S103. Add the first particles, tourmaline and lithium niobate with a mass ratio of 1.7:0.5 to ethanol and water with a volume ratio of 1:1 containing Tween 80 (polysorbate - 80), stir and mix evenly to obtain the second slurry.

[0055] S104. Spray - dry the second slurry, perform DC polarization with an electric field strength of 1.4 kV / mm, and calcine at 1000 °C for 1 h. Among them, the first particles account for 68% of the material; in this example, the thickness of the functional film layer is 220 microns, and the mass of carbon particles in the functional film layer accounts for 23% of the functional film layer. Example 4

[0056] A preparation method of a material capable of stably emitting microwaves and negative ions, comprising the following steps: S101. Add ceramic particles to ethanol and water with a volume ratio of 1:1 containing strontium titanate and barium titanate with a mass ratio of 1:1 and containing Tween 80 (polysorbate - 80), stir and mix evenly to obtain the first slurry.

[0057] S102. After spray - drying the first slurry, obtain the first particles.

[0058] S103. Add the first particles, tourmaline and lithium magnesium niobate with a mass ratio of 1.7:0.5 to ethanol and water with a volume ratio of 1:1 containing Tween 80 (polysorbate - 80), stir and mix evenly to obtain the second slurry.

[0059] S104. Spray - dry the second slurry, perform DC polarization with an electric field strength of 1.4 kV / mm, and calcine at 1000 °C for 1 h. Among them, the first particles account for 70% of the material; in this example, the thickness of the functional film layer is 250 microns, and the mass of carbon particles in the functional film layer accounts for 31% of the functional film layer. Example 5

[0060] The difference between Example 5 and Example 1 is only that in the preparation process of Example 5, the first slurry is directly mixed evenly into the second slurry, and then dried and calcined. Example 6

[0061] The difference between Example 6 and Example 1 is only that the thickness of the functional film layer is set to 400 microns.

[0062] Performance test: Place the negative - ion functional materials of Examples 1 - 6 in a test box with dimensions of 50 cm × 25 cm × 25 cm to measure their negative - ion release amount. Connect a computer to the instrument to record the values. The test time is 3 min, and the test results of the negative - ion release performance are shown in Table 1: Table 1. Test results: Test item <![CDATA[Negative ion release amount range (ions / cm 3 )]]> Example 1 3500~14000 Example 2 2800~12000 Example 3 1600~11000 Example 4 2000~12000 Example 5 300~2000 Example 6 800~5600 As can be seen from Table 1, compared with Examples 1 to 4, Example 5 does not have a core-shell structure, and its negative ion release effect is poor. Moreover, the dielectric constant and dielectric loss of the material in Example 5 are higher than those of the materials in Examples 1 to 4, mainly because it does not have a three-dimensional core-shell structure; in Example 6, too high a thickness of the functional film layer will affect the structure of the material, as well as the negative ion release performance and dielectric properties.

[0063] In the above embodiments, the descriptions of each embodiment have their own emphases. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification. After considering the specification and practicing the invention disclosed herein, those skilled in the art will readily conceive of other embodiments of the present application. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

[0064] It should be understood that the present application is not limited to the exact structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A material capable of stably emitting microwaves and negative ions, characterized in that: include: Ceramic particles, and a functional film layer on the surface of the ceramic particles; The functional film layer comprises mineral powder and lithium salt; wherein the thickness of the functional film layer is 60 to 300 microns.

2. The material capable of stably emitting microwaves and negative ions according to claim 1, characterized in that: The mineral powder includes at least one of strange ice stone, tourmaline, medical stone, Guiyang stone, agate, feldspar or mica; and / or, the lithium salt comprises at least one of lithium niobate or lithium magnesium niobate; And / or, the ceramic particles include at least one of strontium titanate, barium titanate or calcium titanate.

3. The material capable of stably emitting microwaves and negative ions according to claim 2, characterized in that: The ceramic particles account for 50% to 70% of the total mass of the material; And / or, the functional film layer accounts for 30% to 50% of the total mass of the material; in the functional film layer, the mass ratio of the mineral powder to the lithium salt is (1 to 2): (0.3 to 0.6).

4. The material capable of stably emitting microwaves and negative ions according to claim 1, characterized in that: The particle size of the ceramic particles is 10 to 1000 microns; And / or, the particle size of the mineral powder is 10 to 100 microns; And / or, the particle size of the lithium salt is 10-100 microns.

5. The material capable of stably emitting microwaves and negative ions according to claim 2, characterized in that: The functional film layer also includes carbon particles; The raw material of the carbon particles includes at least one of polyvinyl pyrrolidone, Tween 80 (polysorbate 80) or polyvinyl alcohol.

6. The material capable of stably emitting microwaves and negative ions according to claim 5, characterized in that: The mass of the carbon particles accounts for 22% to 40% of the functional film layer.

7. A method for preparing a material capable of stably emitting microwaves and negative ions, characterized in that: The steps include: Adding ceramic particles into a solution containing additives, stirring and mixing to obtain a first slurry; After drying the first slurry, first particles are obtained; Adding the first particles, mineral powder and lithium salt into the solution containing the additive, stirring and mixing evenly to obtain a second slurry; Drying, DC polarizing and calcining the second slurry to obtain the material; Wherein, the additive includes at least one of polyvinyl pyrrolidone, Tween 80 (polysorbate 80) or polyvinyl alcohol.

8. The method for preparing a material capable of stably emitting microwaves and negative ions according to claim 7, characterized in that: The DC polarization is performed at an electric field strength of 1.5 kV / mm to 3 kV / mm, and the polarization time is 6 min to 12 min; And / or, the calcination is carried out by heating the temperature to 800°C to 1000°C at a heating rate of 1.5°C / min to 2.5°C / min and keeping the temperature for 1h to 4h.

9. The method for preparing a material capable of stably emitting microwaves and negative ions according to claim 7, characterized in that: The mass fraction of the polyvinyl alcohol solution is 3% to 7%; And / or, the solution comprises at least one of water, ethanol or methanol.

10. Use of the material capable of stably emitting microwaves and negative ions as claimed in any one of claims 1 to 6, and / or the material capable of stably emitting microwaves and negative ions obtained by the preparation method as claimed in any one of claims 7 to 9, characterized in that: Used in communications, construction or environmental protection fields.

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