A honeycomb-like serpentine structure, a method of making and a method of use

Abstract

The application provides a honeycomb serpentine structure, a preparation method and an application method, and belongs to the field of functional materials and preparation and application. The serpentine structure is columnar, has continuous honeycomb units in the cross section, each honeycomb unit forms a through hole in the columnar structure, and the honeycomb wall uniformly contains 60%-90% serpentine material, has the functions of releasing negative oxygen ions and adsorbing air pollutants; the honeycomb unit is a regular hexagon, a regular quadrilateral or a circle; during preparation, 10%-40% of sintering aids in total mass are added into the crushed serpentine powder, then a primary mud is prepared, the honeycomb green body is obtained through exhaust and extrusion molding; the green body is immediately subjected to microwave shaping after demolding; and then drying and ladder type calcination are carried out, so that the honeycomb serpentine structure is obtained. The application provides a novel air improvement structure material, and the production yield of the prepared product is high, the production cycle is short, and the production cost is low; and the application can be used for releasing negative oxygen ions into the surrounding air.

Description

Technical Field

[0001] This invention belongs to the field of functional materials and preparation, specifically relating to a honeycomb serpentine structure, its preparation method, and its application method. Background Technology

[0002] As people's living standards improve, they are paying more and more attention to health, with air quality being a crucial aspect. However, with the expansion of urbanization and the widespread use of chemical products, air pollution is ubiquitous. Since small spaces within this larger environment are closely related to people's lives, people are trying various methods to improve indoor and mobile air quality.

[0003] In existing technologies, people use air purification equipment to improve air quality, and the key to air purification equipment lies in the filter element. To achieve multiple functions simultaneously, typical filter elements contain multi-layered structures or multiple materials, with each layer or material performing a specific function, such as filtering dust, releasing negative oxygen ions, or filtering organic matter. These multi-layered structures or multiple functional materials are then integrated through a supporting frame or flexible enclosure. However, in such filter elements, different components can interfere with each other, and some materials cannot be integrated, necessitating the abandonment of certain functions, creating a functional bottleneck. Furthermore, the production process is complex, costly, and time-consuming, hindering the application and promotion of the product. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a honeycomb serpentine structure, its preparation method, and its application method. The preparation method uses serpentine as the basic material. The raw serpentine ore is ground into powder, then mixed with a sintering aid to form a honeycomb-shaped blank. Finally, it is sintered to obtain the honeycomb serpentine structure. This structure is robust and possesses the required mechanical properties. It is used to release negative oxygen ions into the surrounding air and adsorb air pollutants, increasing the negative oxygen ion content and exhibiting a continuous and stable release capacity as well as effective adsorption, thus improving environmental quality. Furthermore, the preparation process is simple, the production cycle is short, and it is suitable for large-scale industrial production.

[0005] To achieve the above objectives, the inventors of this invention have conducted a thorough study of existing air purification device filter elements and their manufacturing methods. The study found that honeycomb structures, due to their large specific surface area and low ventilation resistance, are widely used in the manufacture of support components for various filter elements. Furthermore, by functionally optimizing these support components, they acquire air purification capabilities. Generally, the honeycomb structure itself, as a support component, does not possess air purification functionality, thus increasing the manufacturing cost and complexity of the filter element to some extent.

[0006] Serpentine, as a natural mineral, has been shown in literature to release negative oxygen ions under certain conditions. However, current applications of serpentine are primarily based on its natural mineral structure, directly processing the blocky jade-like structure into decorative items. This approach, and existing methods of applying serpentine, do not fully utilize its advantage of releasing negative oxygen ions, resulting in low or short-lasting release rates. The inventors' research revealed that conventional methods for preparing honeycomb ceramic filter elements often involve extrusion molding followed by prolonged natural or conventional drying, and then sintering. These methods have long production cycles, low green strength, and difficulty in guaranteeing yield. While microwave technology exists for drying ceramic green bodies, it is mostly concentrated in conventional oxide ceramic systems, primarily aimed at increasing the drying rate. To prepare serpentine into a honeycomb structure for air purification, it needs to be ground into fine powder before shaping and sintering. Existing ceramic production processes for producing honeycomb serpentine have the following problems and key defects: The sintering process is crude, unable to precisely control the dehydration, phase transformation, and densification processes of serpentine, and lacks a sintering step, preventing the release of internal stress in the green body, leading to easy cracking and unstable product performance (negative ion release rate and strength); Traditional extrusion molding results in low green body strength, making it highly susceptible to breakage and deformation during subsequent drying, handling, and sintering, resulting in a low final yield and difficulty in achieving stable large-scale production; The lack of strict control over moisture content (often without clearly defined drying requirements or control standards) and strength before and after sintering leads to rapid moisture evaporation during sintering, causing cracks, reducing particle density and strength, and affecting performance.

[0007] Based on the above analysis, this invention proposes a honeycomb serpentine structure, its preparation method, and its application method. The method yields a honeycomb serpentine structure that synergistically addresses high green strength, high yield, and efficient activation and release of negative oxygen ions. This structure is then applied to the filter layer of existing air purifiers or to negative oxygen ion air improvement devices designed based on this structure. It continuously releases negative oxygen ions and adsorbs air pollutants to improve the air environment. The preparation process uses serpentine as the base material, involving grinding, blanking, microwave shaping, and stepped sintering. The key technology of "microwave shaping" is creatively applied to the preparation of the honeycomb structure using serpentine as the main raw material, aiming to solve the problems of low green strength and easy breakage. This lays a solid structural foundation for the subsequent step-sintering process to fully activate its negative oxygen ion release function. The specific technical solution is as follows:

[0008] In a first aspect, embodiments of the present invention provide a honeycomb serpentine structure. The structure is columnar with continuous honeycomb units in its cross-section. Each honeycomb unit forms a through-hole within the columnar structure, and the honeycomb walls uniformly contain 60%–90% serpentine material by mass, thus having the function of releasing negative oxygen ions. The honeycomb units are hexagonal, quadrilateral, or circular, with an inner diameter of 1.9–6.0 mm and an outer diameter of 2.1–9.0 mm. The overall columnar cross-section formed by the honeycomb units is circular, elliptical, rectangular, or square, selected according to actual production needs and mold requirements.

[0009] In one executable embodiment, the serpentine material content is 70% to 90 t of the total mass; preferably, the serpentine content is 75% to 85% of the total mass.

[0010] Secondly, embodiments of the present invention also provide a method for preparing the honeycomb serpentine structure as described above, the method comprising:

[0011] Step S1: Select natural serpentine raw stone, crush it and grind it, then pass it through a 200-400 mesh sieve to obtain serpentine powder. Ensure that the powder has a uniform particle size, which lays the foundation for subsequent molding and sintering.

[0012] Step S2: Weigh 600-900 parts of serpentine powder, 2-8 parts of binder, and 100-400 parts of sintering aid according to the total mass parts; mix the serpentine powder, binder, and sintering aid and stir evenly to obtain a mixed powder.

[0013] In this step, the mixed powder is mainly composed of serpentine powder, supplemented with a small amount of sintering aid at a ratio of 10% to 40%, to ensure that the final product can fully utilize the functions of the serpentine mineral components.

[0014] The sintering aid not only facilitates the molding of serpentine powder but also enables it to sinter together with the powder, resulting in a uniform distribution of the mineral components within the product after sintering. Preferably, the sintering aid is ceramic clay or a clay-like material, such as kaolin.

[0015] Step S3: Add 15% to 25% of the total mass of the mixed powder to the mixed powder in the form of spray in several batches, and stir for 1 to 3 hours to obtain the primary mud.

[0016] In this step, a pumice mill can be used to prepare the clay. The mixed powder is first added to the pumice mill, and while stirring begins, atomized water is added to the mixed powder in several batches to ensure uniform mixing of the water and powder, forming the clay. Preferably, the pumice mill speed is 700~900 r / min.

[0017] In step S4, add 0.5% to 1.5% of the total mass of the mixed powder to the primary clay material in the form of a spray, and continue to stir at a speed of 500 to 700 r / min for 30 to 60 min to obtain the green body clay material.

[0018] In this step, adding a lubricant to the green body gives it a certain degree of demolding ability; however, the addition of lubricant reduces the green body's molding ability. Therefore, in this embodiment, a microwave shaping process is added to balance the effect of adding lubricant to the green body. The two work together to achieve molding. Preferably, the lubricant is an oily small-molecule organic compound, such as vegetable oil.

[0019] Step S5: The clay body is extruded in a vacuum environment to expel air from the clay and obtain bubble-free rod-shaped clay.

[0020] In this step, the initial rod-shaped clay material is obtained, which can be directly extruded using a hydraulic press. Simultaneously, a vacuum device is used in conjunction with the extrusion process to evacuate the clay material and remove air bubbles. The vacuum level should be at least 1.0 × 10⁻⁶. -3 Pa, the hydraulic press pressure is (3.0~10.0) × 10 5 Pa. When air is expelled by hydraulic extrusion, it is difficult to completely expel it in one extrusion. Generally, it is necessary to cycle 2 to 3 times to remove all air bubbles.

[0021] Step S6: The rod-shaped clay is extruded and shaped into molds of different sizes according to the preset molding specifications to obtain a semi-dry honeycomb-shaped green body, etc.

[0022] Step S7, the final demolding stage of extrusion molding: immediately after demolding, the green blank is sent into a microwave shaping equipment for microwave shaping. The microwave action densifies the internal structure of the honeycomb green blank and gives it the predetermined mechanical strength, maintaining its shape at the time of demolding.

[0023] In this step, microwave shaping is creatively employed to give the serpentine green body, which is originally difficult to demold and shape, the predetermined mechanical strength, thereby maintaining its shape after demolding and completing the green body shaping, while avoiding cracking during subsequent sintering. Because a relatively large amount of serpentine is retained in the raw material ratio, with serpentine powder as the main component, and because serpentine mineral has a natural disadvantage in shaping and is difficult to form, microwave shaping technology is added in this step to ensure that the green body retains its shape after demolding and completes the shaping process. The microwave shaping process involves the removal of some moisture. During this process, the honeycomb wall green body becomes homogenized and denser as the moisture is shaken and partially removed under microwave conditions. This homogenization and density are achieved at a predetermined moisture content. If microwave drying is used directly, the moisture content during subsequent drying will be too low, causing the particles inside the green body to lose mobility and preventing further homogenization and density. The removal of water may even lead to unevenness. Therefore, the microwave must be maintained at a specific power and duration. Excessive power or time will result in excessive moisture removal, leading to unevenness or even cracking of the green body. Insufficient power or time will result in excessive moisture and insufficient strength, causing the green body to collapse and deform after demolding. This microwave shaping process differs from microwave drying and requires control of microwave power and duration. Preferably, the microwave shaping duration is generally 20-60 minutes, and the power is 100-150 kW.

[0024] Step S8 involves drying the microwave-shaped green body at a temperature between 50°C and 75°C for at least 24 hours. The moisture content of the dried product should not exceed 8%. At this point, the strength of the honeycomb green body before sintering is 1.3~1.5 MPa. Precise control of the moisture content can prevent the rapid evaporation of moisture during sintering, thus preventing the formation of internal pores and ensuring the structural integrity of the filter element.

[0025] This step achieves the stability of the green body by setting the drying temperature range and moisture content index, maintaining its shape during the drying process, and preventing cracking and other problems without forming defects, thus improving the yield.

[0026] Step S9: Place the green blank with the required moisture content into a sintering furnace and perform step-by-step calcination to obtain a honeycomb serpentine structure.

[0027] The stepped calcination process described in this step is as follows:

[0028] First stage, preheating and decomposition stage:

[0029] Process parameters: Heat from room temperature to 600-700 ℃ at a rate of 2-5 ℃ / min, and sinter at a constant temperature for 1-3 h;

[0030] Process effect: It achieves stable pre-firing of green body, effectively eliminates volatile components in the structure, and fundamentally avoids product cracking and pulverization caused by rapid thermal decomposition during subsequent high-temperature sintering.

[0031] The second stage, the high-temperature sintering stage:

[0032] Process parameters: Continue heating from the above sintering temperature to 1000~1200℃ at a rate of 2~5℃ / min, sinter for 6~10 h, and control the shrinkage ratio to 12%~18%;

[0033] Process effect: At this temperature, serpentine powder undergoes a solid-phase reaction, and the crystal structure decomposes and transforms. At the same time, sintering aids begin to take effect, promoting the densification of the green body.

[0034] The third stage, furnace cooling stage:

[0035] Process parameters: The green body is naturally cooled to room temperature in the furnace to complete sintering. The strength of the sintered green body is 6~9 MPa.

[0036] Process effect: Slow cooling eliminates internal stress and improves the mechanical strength and overall structural stability of the final product.

[0037] The honeycomb serpentine structure obtained after sintering is then dust-removed, sealed with a film, left to stand in the finished product compartment, and then shipped out and packaged.

[0038] During the surface dust removal and sealing stage, after blowing away surface dust with a fan, a water-soluble interface agent is sprayed from above and below the surface at 50-70°C using a sprayer to prevent dust from falling off the finished product and enhance its moisture resistance. The finished product should be left to stand in the container for more than 24 hours.

[0039] Thirdly, based on the above preparation method and the prepared honeycomb serpentine structure, this embodiment of the invention also provides an application method for the honeycomb serpentine structure, which is used to release negative oxygen ions into the surrounding air and to adsorb air pollutants.

[0040] In one feasible embodiment, the honeycomb serpentine structure directly replaces the adsorption or filter layer, such as the carbon adsorption layer, in existing air purifiers, so that the part that originally only performed the purification function can also release negative oxygen ions.

[0041] In another feasible embodiment, an air improvement device is designed and manufactured based on the honeycomb serpentine structure. The device includes a shell with a porous structure on all four sides and top, an air outlet device disposed at the bottom of the shell, and a honeycomb serpentine structure embedded in the shell. The shell can be cylindrical or rectangular.

[0042] The honeycomb serpentine structure and preparation method provided in this invention have the following beneficial effects:

[0043] The honeycomb serpentine structure prepared by the above method has significant functions in adsorbing harmful organic molecules such as formaldehyde and releasing negative oxygen ions. It effectively utilizes the negative oxygen ion release capacity of serpentine while avoiding overheating that could reduce its activity. Tests show that the honeycomb serpentine structure prepared in this invention releases negative oxygen ion concentrations reaching (2.5~5.8) × 10⁻⁶. 3 ions / cm 3 The formaldehyde purification efficiency and the persistence of formaldehyde purification both exceed 80%.

[0044] The preparation method described in the above embodiments of the present invention yields a honeycomb serpentine structure with uniform shape, regular size, and stable performance. By introducing sintering aids and optimizing the sintering process, the internal structure of the filter element is firmly bonded, resulting in a dense sintered body and a controllable microporous structure. This significantly improves the compressive strength and wear resistance of the filter element, making it less prone to pulverization and extending its service life. The clearly defined parameters for each step make the entire process easy to control, highly repeatable, and suitable for industrial mass production. The high product consistency and good process stability make it suitable for large-scale production. Microwave shaping technology allows for the uniform and rapid activation of moisture and molecules within the green body, thereby significantly increasing the initial strength of the green body in a very short time. This effectively solves the problems of breakage and deformation caused by handling during drying and furnace loading, significantly improving the strength of the green body and the yield rate. The prepared honeycomb serpentine structure has a columnar appearance and a honeycomb cross-section. The honeycomb units form through-holes in the columnar structure, providing a large surface area and maximizing the release of negative oxygen ions from the serpentine distributed within.

[0045] The prepared honeycomb serpentine structure is applied to improve the surrounding air quality by releasing negative oxygen ions and adsorbing air pollutants, while ensuring the concentration and persistence of negative oxygen ions.

[0046] Of course, implementing any product or method of the present invention does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a flowchart of the method for preparing the honeycomb serpentine structure according to an embodiment of the present invention;

[0049] Figure 2 This is a schematic diagram of the appearance of the honeycomb serpentine structure prepared in Example 1 of the present invention;

[0050] Figure 3 This is a schematic diagram of the appearance of the honeycomb serpentine structure prepared in Example 2 of the present invention;

[0051] Figure 4 This is a schematic diagram of the appearance of the honeycomb serpentine structure prepared in Example 3 of the present invention;

[0052] Figure 5 This is a schematic diagram of the appearance of the honeycomb serpentine structure prepared in Example 4 of the present invention;

[0053] Figure 6 This is a three-dimensional structural schematic diagram of the air improvement device prepared in Embodiment 7 of the present invention;

[0054] Figure 7 This is a bottom view of the air improvement device prepared in Embodiment 7 of the present invention;

[0055] Figure 8 This is a cross-sectional schematic diagram of the air improvement device prepared in Embodiment 7 of the present invention.

[0056] Explanation of reference numerals in the attached figures:

[0057] 10-Outer shell; 11-Air inlet; 12-Top air outlet; 13-Side air outlet; 14-Power switch; 15-Speed ​​control switch; 16-Shock-absorbing feet; 17-Functional platform; 18-Control platform; 20-Air outlet device. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can also be combined with each other.

[0059] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this invention, the terms "first," "second," "third," "fourth," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0060] Example 1

[0061] This embodiment provides a honeycomb-like serpentine structure and its preparation method. The preparation method includes:

[0062] Natural serpentine ore from Luobei was selected. After crushing, it was ground and passed through a 200-mesh sieve to obtain serpentine powder. 60 kg of the powder was weighed out, and 40 kg of kaolin was added as a sintering aid and 0.2 kg of cellulose as a binder. After mixing evenly, the mixture was placed in a ply mill. Water (25% of the total mass of the powder) and vegetable oil (1.5% of the total mass) were weighed out as a lubricant and divided into five equal portions. Water was first added to the powder mixture in five spray applications. Simultaneously, the ply mill was started at a speed of 700-900 r / min. The water was added in five applications within the first hour of mixing. Mixing continued for another 2 hours to obtain primary clay. Lubricant was then added to the primary clay in five spray applications, and mixing continued at 500-700 r / min for 30-60 minutes to obtain the green body clay.

[0063] The clay blank is placed into a hydraulic press, with a pressure of 3×10. 5 Pa, the clay is cyclically squeezed twice to remove air bubbles; the clay after air bubbles are removed is pressed into a circular cylindrical honeycomb mold with a cross-section composed of hexagonal honeycomb units, the inner diameter of which is 5.8 mm and the outer diameter is 8.7 mm, to obtain a semi-dry cylindrical green body with a cross-section composed of honeycomb hexagons; because the green body contains a lot of serpentine powder, its mechanical strength is low, and it will collapse and deform naturally after demolding; therefore, in this embodiment, after demolding, the green body is immediately sent to a microwave shaping device and microwave shaped at 150 kW for 20 min. At this time, the green body reaches the predetermined mechanical strength and can maintain the honeycomb structure and state at the time of demolding.

[0064] The honeycomb-shaped green bodies are then fed into a dryer, with the drying temperature controlled between 50℃ and 75℃ for 25 hours. Testing shows that the moisture content of the dried green bodies does not exceed 8%, and the strength is 1.5 MPa. The green bodies are then placed in a sintering furnace, and the temperature is increased from room temperature to 600℃ at a rate of 2-5℃ / min, and sintered at this constant temperature for 3 hours. The temperature is then increased to 1000℃ at a rate of 2-5℃ / min, and sintered in the furnace for 10 hours. Finally, the green bodies are allowed to cool naturally to room temperature within the furnace, completing the sintering process. The strength of the sintered green body is 6-9 MPa. The resulting honeycomb-shaped serpentine structure is then surface-dust-removed, sealed with a protective film, left to stand in a finished product container, and then packaged and shipped out.

[0065] like Figure 2 As shown, the honeycomb serpentine structure prepared by the above method is columnar, with a circular cross-section formed by continuous hexagonal honeycomb units. Each honeycomb unit forms a through hole in the columnar structure, and the honeycomb wall uniformly contains 60% serpentine material, which has the function of releasing negative oxygen ions and adsorbing air pollutants; wherein, the honeycomb unit is a continuous regular hexagonal honeycomb unit.

[0066] The prepared honeycomb serpentine structure was used to release negative oxygen ions into the surrounding environment and to adsorb air pollutants. The performance of the honeycomb serpentine structure prepared in this invention was tested during application. Test results: In a standard test chamber, the concentration of negative oxygen ions released from the air inside the chamber containing the prepared honeycomb serpentine structure reached 1.2 × 10⁻⁶. 9 ions / m 3 (Blank capsule), 3.7×10 9 ions / m 3 (Sample chamber), meaning that the present invention releases a negative oxygen ion concentration of 2.5 × 10⁻⁶. 3 ions / cm 3 Formaldehyde purification efficiency: 82%; Formaldehyde purification durability: 80%.

[0067] Example 2

[0068] This embodiment also provides a honeycomb serpentine structure and its preparation method. The preparation method includes:

[0069] Natural serpentine ore from a certain region was selected. After crushing, it was ground and passed through a 400-mesh sieve to obtain serpentine powder. 90 kg of the powder was weighed out, and 10 kg of kaolin was added as a sintering aid and 0.8 kg of cellulose as a binder. After mixing evenly, the mixture was placed into a ply mill. Water (15% of the total mass of the mixed powder) and vegetable oil (0.5% of the total mass) were weighed out as a lubricant and divided into five equal portions. Water was first added to the mixed powder in five sprays. At the same time, the ply mill was started at a speed of 700-900 r / min. The water was added in five sprays within the first hour of mixing. Mixing continued for another 2 hours to obtain primary clay. Lubricant was then added to the primary clay in five sprays, and mixing continued at a speed of 500-700 r / min for 30-60 minutes to obtain the green body clay.

[0070] The clay blank is placed into a hydraulic press, with a pressure of 3×10. 5 Pa, the clay is cyclically squeezed 3 times to remove air bubbles; the clay after removing air bubbles is pressed into a square columnar mold with a cross-section composed of square honeycomb units, the inner diameter of which is 1.9 mm and the outer diameter is 2.1 mm, to obtain a semi-dry square columnar green body with a cross-section composed of honeycomb squares; because the green body contains a lot of serpentine powder, it has low mechanical strength and will collapse and deform naturally after demolding; therefore, in this embodiment, after demolding, the green body is immediately sent to a microwave shaping device and microwave shaped at 100 kW power for 60 min. At this time, the green body reaches the predetermined mechanical strength and can maintain the honeycomb structure and state at the time of demolding.

[0071] The honeycomb-shaped green bodies are then fed into a dryer, with the drying temperature controlled between 50 ℃ and 75 ℃ for 30 hours. Testing shows that the moisture content of the dried green bodies does not exceed 8%, and the strength is 1.3 MPa. The green bodies are then placed in a sintering furnace, and the temperature is increased from room temperature to 700 ℃ at a rate of 2-5 ℃ / min, and sintered at this constant temperature for 1 hour. The temperature is then increased to 1200 ℃ at a rate of 2-5 ℃ / min, and sintered in the furnace for 6 hours. Finally, the green bodies are allowed to cool naturally to room temperature within the furnace, completing the sintering process. The strength of the sintered green body is 6-9 MPa. The resulting honeycomb-shaped serpentine structure is then surface-dust-removed, sealed with a protective film, left to stand in a finished product container, and then packaged and shipped out.

[0072] like Figure 3 As shown, the honeycomb serpentine structure prepared by the above method is columnar, with a square cross-section formed by continuous square honeycomb units. Each honeycomb unit forms a through hole in the columnar structure, and the honeycomb wall uniformly contains 90% serpentine material, which has the function of stably and continuously releasing negative oxygen ions and adsorbing air pollutants.

[0073] The prepared honeycomb serpentine structure was used to release negative oxygen ions into the surrounding environment and to adsorb air pollutants. The performance of the honeycomb serpentine structure prepared in this invention was tested during application. Test results: In a standard test chamber, the concentration of negative oxygen ions released from the air inside the chamber containing the prepared honeycomb serpentine structure reached 1.2 × 10⁻⁶. 9 ions / m 3 (Blank compartment), 7.0×10 9 ions / m 3 (Sample chamber), meaning that the present invention releases a negative oxygen ion concentration of 5.8 × 10⁻⁶. 3 ions / cm 3 Formaldehyde purification efficiency: 89%; formaldehyde purification durability: 85%.

[0074] Example 3

[0075] This embodiment also provides a honeycomb serpentine structure and its preparation method. The preparation method includes:

[0076] Natural serpentine rough stones from a certain region were selected. After crushing, they were ground and passed through a 300-mesh sieve to obtain serpentine powder. 75 kg of the powder was weighed out, and 25 kg of kaolin was added as a sintering aid and 0.5 kg of cellulose as a binder. After mixing evenly, the mixture was placed into a ply mill. Water (20% of the total mass of the mixed powder) and vegetable oil (1.0% of the total mass) were weighed out as a lubricant and divided into five equal portions. Water was first added to the mixed powder in five sprays. At the same time, the ply mill was started at a speed of 700-900 r / min. The water was added in five sprays within the first hour of mixing. Mixing continued for another 2 hours to obtain primary clay. Lubricant was then added to the primary clay in five sprays, and mixing continued at a speed of 500-700 r / min for 30-60 minutes to obtain the green body clay.

[0077] The clay blank is placed into a hydraulic press, with a pressure of 3×10. 5 Pa, the clay is cyclically squeezed 3 times to remove air bubbles; the clay after removing air bubbles is pressed into a cylindrical mold with a cross-section composed of square honeycomb units, the inner diameter of which is 4.0 mm and the outer diameter is 5.6 mm, to obtain a semi-dry cylindrical green body with a cross-section composed of honeycomb squares; because the green body contains a lot of serpentine powder, it has low mechanical strength and will collapse and deform naturally after demolding; therefore, in this embodiment, after demolding, the green body is immediately sent to a microwave shaping device and microwave shaped at 120 kW power for 45 min. At this time, the green body reaches the predetermined mechanical strength and can maintain the honeycomb structure and state at the time of demolding.

[0078] The honeycomb-shaped green bodies are then fed into a dryer, with the drying temperature controlled between 50℃ and 75℃ for 28 hours. Testing shows that the moisture content of the dried green bodies does not exceed 8%, and the strength is 1.5 MPa. The green bodies are then placed in a sintering furnace, and the temperature is increased from room temperature to 650℃ at a rate of 2-5℃ / min, and sintered at this constant temperature for 2 hours. The temperature is then increased to 1200℃ at a rate of 2-5℃ / min, and sintered in the furnace for 6 hours. Finally, the green bodies are allowed to cool naturally to room temperature within the furnace, completing the sintering process. The strength of the sintered green body is 6-9 MPa. The resulting honeycomb-shaped serpentine structure is then surface-dust-removed, sealed with a protective film, placed in a finished product container, and subsequently packaged and shipped out.

[0079] like Figure 4 As shown, the honeycomb serpentine structure prepared by the above method is columnar, with a circular cross-section formed by continuous square honeycomb units. Each honeycomb unit forms a through hole in the columnar structure, and the honeycomb wall uniformly contains 75% serpentine material. It has the function of stably and continuously releasing negative oxygen ions and adsorbing air pollutants.

[0080] The prepared honeycomb serpentine structure was used to release negative oxygen ions into the surrounding environment and to adsorb air pollutants. The performance of the honeycomb serpentine structure prepared in this invention was tested during application. Test results: In a standard test chamber, the concentration of negative oxygen ions released from the air inside the chamber containing the prepared honeycomb serpentine structure reached 1.2 × 10⁻⁶. 9 ions / m 3 (Blank cabin), 5.4×10 9 ions / m 3 (Sample chamber), meaning that the present invention releases a negative oxygen ion concentration of 4.2 × 10⁻⁶. 3 ions / cm 3 Formaldehyde purification efficiency: 86%; Formaldehyde purification durability: 84%.

[0081] Example 4

[0082] This embodiment also provides a honeycomb serpentine structure and its preparation method. The preparation method is basically the same as in Example 3, except that 70 kg of natural serpentine powder is weighed, and 30 kg of kaolin is added as a sintering aid and 0.45 kg of cellulose as a binder. The mold used for extrusion molding is a square column with a cross-section containing regular hexagonal honeycomb units. Figure 5 As shown, the prepared honeycomb serpentine structure is prismatic in shape, with a square cross-section formed by continuous regular hexagonal honeycomb units.

[0083] The prepared honeycomb serpentine structure was used to release negative oxygen ions into the surrounding environment and to adsorb air pollutants. The performance of the honeycomb serpentine structure prepared in this invention was tested during application. Test results: In a standard test chamber, the concentration of negative oxygen ions released from the air inside the chamber containing the prepared honeycomb serpentine structure reached 1.2 × 10⁻⁶. 9 ions / m 3 (Blank cabin), 5.1×10 9 ions / m 3 (Sample chamber), meaning that the present invention releases a negative oxygen ion concentration of 3.9 × 10⁻⁶. 3 ions / cm 3 Formaldehyde purification efficiency: 84%; Formaldehyde purification durability: 82%.

[0084] Example 5

[0085] This embodiment also provides a honeycomb serpentine structure and its preparation method. The preparation method is basically the same as that in Example 3, except that 80 kg of natural serpentine raw stone powder is weighed, and 20 kg of kaolin is added as a sintering aid and 0.6 kg of cellulose as a binder.

[0086] The prepared honeycomb serpentine structure was used to release negative oxygen ions into the surrounding environment and to adsorb air pollutants. The performance of the honeycomb serpentine structure prepared in this invention was tested during application. Test results: In a standard test chamber, the concentration of negative oxygen ions released from the air inside the chamber containing the prepared honeycomb serpentine structure reached 1.2 × 10⁻⁶. 9 ions / m 3 (Blank cabin), 5.6×10 9 ions / m 3 (Sample chamber), meaning that the present invention releases a negative oxygen ion concentration of 4.4 × 10⁻⁶. 3 ions / cm 3 Formaldehyde purification efficiency: 89%; formaldehyde purification durability: 85%.

[0087] Example 6

[0088] This embodiment provides an application method for the honeycomb serpentine structure prepared as described in Examples 1-5. The honeycomb serpentine structure is applied to an existing air purifier to replace the carbon adsorption layer. In this case, the "air purifier" can not only adsorb air pollutants in the surrounding air, but also stably and continuously release negative oxygen ions, effectively improving air quality.

[0089] Example 7

[0090] This embodiment also provides an application method for the honeycomb serpentine structure prepared as in Examples 1-5. Figures 6 to 8 As shown, an air improvement device is prepared based on the honeycomb serpentine structure. The device includes a square columnar shell 10 with a porous structure on all sides and top, an air outlet device 20 disposed at the bottom of the shell, and a honeycomb serpentine structure embedded in the shell.

[0091] The rectangular shell 10 has an air inlet 11 at the bottom, a top air outlet 12 at the top, side air outlets 13 at the top of the four sides, a speed control switch 15 and a power switch 14 on any one side, and shock-absorbing feet 16 on the base. The interior of the shell 10 has a functional platform 17 for supporting the honeycomb serpentine structure and a control platform 18 for supporting the circuit board and / or battery module.

[0092] This simple structure combines a honeycomb serpentine structure with an air outlet 20, allowing the negative oxygen ions released by the honeycomb serpentine structure to diffuse into the surrounding air environment and absorb air pollutants, thus improving air quality. The device is simple and portable, and can be placed in any indoor or in-vehicle environment.

[0093] In another embodiment, the air improvement device prepared based on the honeycomb serpentine structure can also be circular or rectangular in shape, and its internal structure can be changed according to different needs. As long as it is consistent with the structure and function of the present invention, it falls within the protection scope of the present invention.

[0094] As can be seen from the above embodiments, the honeycomb serpentine structure provided by the embodiments of the present invention has the function of adsorbing harmful organic molecules such as formaldehyde and releasing negative oxygen ions. It can effectively activate the negative oxygen ion release capacity of serpentine, while avoiding over-burning that would reduce its activity. Its preparation method has good process stability and high production yield, which shortens the production cycle of filter products and reduces production costs.

[0095] The above description is merely a preferred embodiment of the present invention and an explanation of the technical principles employed, and is not intended to limit the scope of the claimed invention, but merely to illustrate preferred embodiments of the invention. Those skilled in the art should understand that the scope of the invention is not limited to the specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A honeycomb serpentine structure, characterized in that, The structure is columnar with continuous honeycomb units on the cross-section. Each honeycomb unit forms a through hole in the columnar structure, and the honeycomb wall uniformly contains 80% to 90% serpentine material by mass, which has the function of releasing negative oxygen ions. The method for preparing the honeycomb serpentine structure includes: Step S1: Select natural serpentine raw stone, crush it, grind it, and pass it through a 200-400 mesh sieve to obtain serpentine powder; Step S2: Weigh 600-900 parts of serpentine powder, 2-8 parts of binder, and 100-400 parts of sintering aid according to the total mass; mix the serpentine powder, binder, and sintering aid and stir evenly to obtain a mixed powder. Step S3: Add 15% to 25% of the total mass of the mixed powder to the mixed powder in the form of spray in several batches, and stir to obtain primary mud. Step S4: Add 0.5% to 1.5% of the total mass of the mixed powder to the primary clay material in the form of a spray, and continue stirring to obtain the green body clay material; Step S5: The clay body is extruded in a vacuum environment to remove air from the clay and obtain a rod-shaped clay body without air bubbles. Step S6: Extrude the rod-shaped clay into molds of different sizes according to the preset molding specifications to obtain a semi-dry honeycomb green body; Step S7, the final demolding stage of extrusion molding: immediately after demolding, the green blank is sent into a microwave shaping equipment for microwave shaping. The microwave action densifies the internal structure of the honeycomb green blank and gives it the predetermined mechanical strength, maintaining the shape at the time of demolding; the shaping microwave power is 100~150kW and the time is 20~60min. Step S8: Dry the microwave-shaped green body, ensuring that the moisture content of the dried product does not exceed 8%. Step S9: Place the green body with the required moisture content into a sintering furnace and perform stepped calcination to obtain a honeycomb serpentine structure; the stepped calcination process is as follows: The first stage, the preheating and decomposition stage: the temperature is increased from room temperature to 600-700 ℃ at a rate of 2-5 ℃ / min, and sintered at a constant temperature for 1-3 h; The second stage, the high-temperature sintering stage: continue to raise the temperature to 1000~1200 ℃ at a rate of 2~5 ℃ / min, sinter for 6~10 hours, and control the shrinkage ratio to 12%~18%; The third stage is the furnace cooling stage: the furnace is naturally cooled to room temperature to complete the sintering.

2. The honeycomb serpentine structure according to claim 1, characterized in that, The honeycomb unit is a regular hexagon, a regular square, or a circle.

3. The honeycomb serpentine structure according to claim 1, characterized in that, The sintering aid is ceramic clay.

4. The honeycomb serpentine structure according to claim 1, characterized in that, In step S4, when the air is squeezed out by the hydraulic press, the cycle is repeated 2 to 3 times to remove the air bubbles.

5. The honeycomb serpentine structure according to claim 1, characterized in that, In step S8, the drying temperature is controlled between 50 ℃ and 75 ℃, and the drying time is not less than 24 h.

6. A method for applying the honeycomb serpentine structure as described in any one of claims 1 to 5, characterized in that, The honeycomb serpentine structure is used to release negative oxygen ions into the surrounding air.

7. The application method according to claim 6, characterized in that, The honeycomb serpentine structure is also used to adsorb air pollutants.

8. The application method according to claim 6, characterized in that, The honeycomb serpentine structure can be applied to existing air purifiers to replace the carbon adsorption layer, releasing negative oxygen ions while adsorbing air pollutants; or the honeycomb serpentine structure can be used to prepare air improvement equipment, which includes a shell with a porous structure on all sides and top, an air outlet device set at the bottom of the shell, and a honeycomb serpentine structure embedded in the shell.

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