Preparation method of self-cleaning titanium and titanium alloy filter screen for filtering moxa smoke

Abstract

The invention relates to the technical field of metal surface treatment, in particular to a preparation method of a self-cleaning titanium and titanium alloy filter screen for filtering moxa smoke. The method comprises the steps that S1, direct current is introduced into the titanium and titanium alloy filter screen for heat treatment, and a high-activity metastable structure is formed on the surface of the titanium and titanium alloy filter screen; s2, the titanium and titanium alloy filter screen is subjected to anodic oxidation treatment, and a continuous multi-stage micro-nano rough structure is generated on the surface of the metastable structure to cover the surface of the titanium and titanium alloy filter screen; and S3, the surface of the titanium and titanium alloy filter screen is subjected to fluorosilane modification, and a uniform hydrophobic and oleophobic coating is formed on the surface of the multi-stage micro-nano rough structure. A metastable structure is formed on the surface of the titanium and titanium alloy filter screen, so that a continuous and multi-stage micro-nano rough structure is conveniently formed in subsequent anodic oxidation treatment. A firm and uniform hydrophobic and oleophobic coating is formed on a large surface area after fluorosilane modification, and the self-cleaning function is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal surface treatment, and in particular to a method for preparing a self-cleaning titanium and titanium alloy filter screen for filtering moxa smoke. Background Art

[0002] Titanium and titanium alloys have excellent properties such as high specific strength, good heat resistance and corrosion resistance. They are widely used in aviation, navigation, biomedicine, chemistry and chemical engineering and other fields.

[0003] Titanium metal is also used in the field of medical moxibustion. Moxibustion requires the use of a moxibustion tube, with a bottom cover at the lower end of the moxibustion tube and a filter on the bottom cover. The filter is generally made of titanium and titanium alloy. A top cover is set at the upper end of the moxibustion tube, and a moxa stick is inserted at the lower end of the top cover. By burning the moxa stick, the volatile wormwood essential oil evaporates to the skin acupuncture points during moxibustion, and combines with the heat of the moxa fire to act on the moxibustion points, which can enter the spleen, liver, and kidney meridians, dispel cold and dampness, promote blood circulation and remove blood stasis, and inhibit and kill many bacteria and viruses.

[0004] During actual moxibustion, the moxa smoke produced by the burning of moxa sticks is an indispensable part of the moxibustion. In the moxa stick, each gram of moxa leaf burning will produce approximately 0.022 grams of volatile components, 0.29 grams of tar and other paste components, and 0.091 grams of ash. The large amount of tar produced after the burning of the moxa stick will adhere to the titanium and titanium alloy filter nets, which will cause filter blockage or filtration failure, affecting the actual moxibustion effect. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for preparing a self-cleaning titanium and titanium alloy filter mesh for filtering moxa smoke. A metastable structure is formed on the surface of the titanium and titanium alloy filter mesh, which facilitates subsequent anodizing treatment to form a continuous, multi-level micro-nano rough structure. After modification with fluorosilane, a strong, uniform hydrophobic and oleophobic coating is formed on a larger surface area, thereby enhancing the self-cleaning function.

[0006] In view of the above technical problems, the technical solution provided by the present invention is a method for preparing a self-cleaning titanium and titanium alloy filter for filtering moxa smoke, comprising:

[0007] S1: passing direct current into the titanium and titanium alloy filter screen for heat treatment to form a highly active metastable structure on the surface of the titanium and titanium alloy filter screen;

[0008] S2: Using the titanium and titanium alloy filter screen as an anode for anodizing treatment, a continuous multi-level micro-nano rough structure is generated on the surface of the metastable structure to cover the surface of the titanium and titanium alloy filter screen;

[0009] S3: The surface of the titanium and titanium alloy filter is modified with fluorosilane to form a uniform hydrophobic and oleophobic coating on the surface of the multi-level micro-nano rough structure.

[0010] Furthermore, in S1, the current density of the direct current is 100 to 600 A / cm 2 The power-on time is 50 to 300 seconds.

[0011] Furthermore, in S1, the temperature of the electrical contact heat treatment is controlled at 600°C to 1050°C.

[0012] Furthermore, in S2, a platinum electrode is used as a cathode and anodization treatment is performed in an electrolyte of Na2HPO4.

[0013] Furthermore, the distance between the anode and the cathode is 5 cm, and anodizing is carried out in an electrolyte of 0.1-0.3 mol / L Na2HPO4. During the anodizing process, a magnetic stirrer is used for uniform stirring, the reaction temperature is maintained at 20°C-30°C, the electrolysis potential is 20-50V, and the anodizing time is 3-8h.

[0014] Furthermore, the potential is 30 V and the anodization time is 5 h.

[0015] Furthermore, in S3, after anodizing, the titanium and titanium alloy filter screens are ultrasonically treated in anhydrous ethanol and deionized water in turn; then immersed in an anhydrous ethanol solution containing fluorosilane for low surface energy modification, and dried after being taken out of the immersion.

[0016] Furthermore, the titanium and titanium alloy filter screen is ultrasonically treated in anhydrous ethanol and deionized water for 5 minutes, immersed in an anhydrous ethanol solution containing 0.1-0.3wt% fluorosilane for low surface energy modification for 4-8 hours, and dried at 100°C for 30 minutes.

[0017] Furthermore, the weight percentage of the fluorosilane in the anhydrous ethanol solution is 0.1wt%, and the immersion time is 6h.

[0018] Furthermore, in S1, after the heat treatment, the titanium and titanium alloy filter screen is cooled by water cooling.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] (1) Direct current is passed through the titanium and titanium alloy filter. Due to the short heat treatment time, irregular tangled dislocations are polygonized, and the initial high-angle grain boundaries are divided into several subgrains. Compared with traditional furnace heating, the thermal energy of Joule heat (thermal effect) brought by current treatment and the kinetic energy from electron momentum transfer (non-thermal effect) synergistically promote the movement and rearrangement of dislocations to evolve into subgrain boundaries, which is conducive to grain refinement, and the enhancement of dislocation mobility further leads to a uniform grain size distribution.

[0021] Through the combined effect of dislocation rearrangement and grain refinement, a large number of metastable phases will be formed inside and on the surface of titanium and titanium alloys, thereby producing a large number of highly active metastable structures, laying a microscopic foundation for subsequent surface treatment.

[0022] Anodizing treatment is to place the titanium and titanium alloy filter as the anode in the electrolyte and apply voltage to form an oxide film on the surface of the titanium alloy. The metastable structure has a higher reactivity, which helps the nucleation and growth of the oxide film during the anodizing process. At the same time, the small-angle grain boundaries and fine grains in the metastable structure can provide a large number of microscopic defects as active sites for chemical reactions. In this way, through the optimization of the microstructure, the electrolyte can penetrate and oxidize more evenly, which helps to form a more uniform oxide film and is easier to form a continuous, multi-level micro-nano rough structure, so that the multi-level micro-nano rough structure completely covers the surface of the titanium and titanium alloy filter.

[0023] The multi-level micro-nano rough structure formed by anodizing treatment is a prerequisite for the self-cleaning function of titanium and titanium alloy filters. It provides a larger surface area and better adhesion for the modification of fluorosilane, allowing fluorosilane to be evenly distributed on a larger surface area to form a strong and uniform hydrophobic and oleophobic coating, giving the filter surface good hydrophobicity and oleophobicity, allowing the surface to more effectively repel water and oil, thereby improving the self-cleaning function. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a flow chart of the preparation method of the present invention. DETAILED DESCRIPTION

[0025] The present invention discloses a method for preparing a self-cleaning titanium and titanium alloy filter screen for filtering moxa smoke, comprising:

[0026] S1: Direct current is passed through the titanium and titanium alloy filter screen for heat treatment to form a highly active metastable structure on the surface of the titanium and titanium alloy filter screen.

[0027] Specifically, electric contact heat treatment is to apply an electric field at both ends of the material so that direct current passes through the material. The heat treatment is performed using the Joule heat generated by the current flowing through titanium and titanium alloy high-resistance materials. It has the characteristics of fast heating rate and high thermal efficiency. In particular, the thermal and non-thermal coupling effects induced by the current trigger the electro-recrystallization phenomenon that is impossible to occur in conventional heat treatment.

[0028] In S1, the current density of direct current is 100~600A / cm 2 , the power-on time is 50 to 300 seconds. Take out the titanium and titanium alloy filter, clamp the arc welding machine fixture at both ends of the filter, pass direct current directly into the filter for heat treatment, and then cool the titanium and titanium alloy filter.

[0029] Specifically, after the heat treatment, the titanium and titanium alloy filter screen is cooled by water cooling. Of course, air cooling can also be used to meet the actual use requirements. At the same time, the temperature of the electrical contact heat treatment is controlled at 600°C to 1050°C, which can induce fine cellular subgrains (0.1-1.0μm, with orientation difference less than 10°), and the content of small-angle grain boundaries of titanium and titanium alloys is increased to 31%.

[0030] In this treatment, direct current is passed through the titanium and titanium alloy filter. Due to the short heat treatment time, irregular tangled dislocations are polygonized, and the initial high-angle grain boundaries are divided into several subgrains. Compared with traditional furnace heating, the thermal energy of Joule heat (thermal effect) brought by current treatment and the kinetic energy from electron momentum transfer (non-thermal effect) synergistically promote the rearrangement of dislocation movement and evolution into subgrain boundaries, which is conducive to grain refinement, and the enhancement of dislocation mobility further leads to a uniform grain size distribution.

[0031] Through the combined effect of dislocation rearrangement and grain refinement, a large number of metastable phases will be formed inside and on the surface of titanium and titanium alloys, thereby producing a large number of highly active metastable structures, laying a microscopic foundation for subsequent surface treatment.

[0032] S2: The titanium and titanium alloy filter mesh is used as an anode for anodizing treatment, and a continuous multi-level micro-nano rough structure is generated on the surface of the metastable structure to cover the surface of the titanium and titanium alloy filter mesh.

[0033] In S2, a platinum electrode is used as a cathode and anodization is performed in an electrolyte of Na2HPO4.

[0034] Specifically, the distance between the anode of the titanium and titanium alloy filter plate and the cathode of the platinum electrode is 5 cm, and anodization treatment is carried out in an electrolyte of 0.1-0.3 mol / L Na2HPO4. During the anodization process, a magnetic stirrer is used for uniform stirring. The reaction temperature is maintained at room temperature of 20°C-30°C, the potential of anodization is 20-50V, and the anodization time is 3-8h.

[0035] With this treatment, a large number of metastable phases will be formed inside and on the surface of titanium and titanium alloys, thereby producing a large number of highly active metastable structures, laying a microscopic foundation for subsequent surface treatment.

[0036] Anodizing treatment is to place the titanium and titanium alloy filter as the anode in the electrolyte and apply voltage to form an oxide film on the surface of the titanium alloy. The metastable structure has higher reactivity, which helps to promote the nucleation and growth of the oxide film during the anodizing process. At the same time, the small-angle grain boundaries and fine grains in the metastable structure can provide a large number of microscopic defects as active sites for chemical reactions. In this way, through the optimization of the microstructure, the electrolyte can penetrate and oxidize more evenly, which helps to form a more uniform oxide film and is easier to form a continuous, multi-level micro-nano rough structure, so that the multi-level micro-nano rough structure completely covers the surface of the titanium and titanium alloy filter.

[0037] S3: The surface of the titanium and titanium alloy filter is modified with fluorosilane to form a uniform hydrophobic and oleophobic coating on the surface of the multi-level micro-nano rough structure.

[0038] In S3, after anodizing treatment, the titanium and titanium alloy filter screens are ultrasonically treated in anhydrous ethanol and deionized water in turn, and then immersed in an anhydrous ethanol solution containing fluorosilane for low surface energy modification, and then dried after being taken out of the immersion.

[0039] Specifically, the titanium and titanium alloy filter screen is ultrasonically treated in anhydrous ethanol and deionized water for 5 minutes, immersed in an anhydrous ethanol solution containing 0.1-0.3wt% fluorosilane for low surface energy modification for 4-8 hours, and dried at 100°C for 30 minutes.

[0040] This treatment, the multi-level micro-nano rough structure formed by anodizing treatment, is a prerequisite for the self-cleaning function of titanium and titanium alloy filters. The multi-level micro-nano rough structure significantly increases the surface area, providing a larger surface area and better adhesion for the modification of fluorosilane, allowing fluorosilane to be evenly distributed on a larger surface area to form a strong and uniform hydrophobic and oleophobic coating, which can effectively reduce the surface energy of the filter surface, enhance its hydrophobic and oleophobic properties, and more effectively repel water and oil, keep the filter clean, and improve the self-cleaning function.

[0041] By controlling parameters such as current density, potential, reaction time, and solution concentration, the generated micro-nano structure and surface properties can be precisely controlled to ensure optimal performance of the filter in terms of functionality and stability.

[0042] In summary, the preparation method of the present invention provides active sites and promotes the formation of subsequent continuous, multi-level micro-nano rough structures by forming a metastable structure on the surface of titanium and titanium alloy filter meshes, which not only improves the uniformity and reaction activity of the filter mesh during the anodization process, but also provides the necessary basis for subsequent fluorosilane modification, thereby enhancing the overall functionality and achieving the effects of self-cleaning and anti-pollution.

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution of the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application, with reference to the preferred embodiments: Specific embodiment 1:

[0045] refer to Figure 1 The present invention provides a method for preparing a self-cleaning titanium and titanium alloy filter screen for filtering moxa smoke, comprising:

[0046] S1: Direct current is passed through the titanium and titanium alloy filter screen for heat treatment to form a highly active metastable structure on the surface of the titanium and titanium alloy filter screen.

[0047] Specifically, in this embodiment, in S1, the current density of the direct current is 600A / cm 2 , the power-on time is 50s. Take out the titanium and titanium alloy filter, clamp the arc welding machine fixture at both ends of the filter, and directly pass direct current into the filter for heat treatment. The temperature of the electrical contact heat treatment is controlled at 1050℃ and cooled by water cooling.

[0048] S2: The titanium and titanium alloy filter mesh is used as an anode for anodizing treatment, and a continuous multi-level micro-nano rough structure is generated on the surface of the metastable structure to cover the surface of the titanium and titanium alloy filter mesh.

[0049] Specifically, in this embodiment, in S2, a platinum electrode is used as a cathode, and the distance between the anode of the titanium and titanium alloy filter plate and the cathode of the platinum electrode is 5 cm. Anodizing is carried out in a 0.3 mol / L Na2HPO4 electrolyte, and a magnetic stirrer is used for uniform stirring. The reaction temperature is maintained at room temperature of 30°C, the potential of anodizing is 30 V, and the time of anodizing is 5 h.

[0050] S3: The surface of the titanium and titanium alloy filter is modified with fluorosilane to form a uniform hydrophobic and oleophobic coating on the surface of the multi-level micro-nano rough structure.

[0051] Specifically, in this embodiment, in S3, after anodizing, the titanium and titanium alloy filter screen is ultrasonically treated in anhydrous ethanol and deionized water for 5 minutes in sequence, and then immersed in an anhydrous ethanol solution containing 0.1wt% fluorosilane for low surface energy modification, and then taken out from the solution after immersion for 6 hours, and then dried at 100°C for 30 minutes to complete the preparation of the self-cleaning filter screen.

[0052] Embodiment 2: A method for preparing a self-cleaning titanium and titanium alloy filter for filtering moxa smoke of the present invention comprises:

[0053] S1: Direct current is passed through the titanium and titanium alloy filter screen for heat treatment to form a highly active metastable structure on the surface of the titanium and titanium alloy filter screen.

[0054] Specifically, in this embodiment, in S1, the current density of the direct current is 400A / cm 2 , the power-on time is 200s. Take out the titanium and titanium alloy filter, clamp the arc welding machine fixture at both ends of the filter, and directly pass direct current into the filter for heat treatment. The temperature of the electrical contact heat treatment is controlled at 800℃ and cooled by water cooling.

[0055] S2: The titanium and titanium alloy filter mesh is used as an anode for anodizing treatment, and a continuous multi-level micro-nano rough structure is generated on the surface of the metastable structure to cover the surface of the titanium and titanium alloy filter mesh.

[0056] Specifically, in this embodiment, in S2, a platinum electrode is used as a cathode, and the distance between the anode of the titanium and titanium alloy filter plate and the cathode of the platinum electrode is 5 cm. Anodizing is carried out in a 0.1 mol / L Na2HPO4 electrolyte, and a magnetic stirrer is used for uniform stirring. The reaction temperature is maintained at room temperature of 20°C, the potential of anodizing is 50 V, and the time of anodizing is 3 h.

[0057] S3: The surface of the titanium and titanium alloy filter is modified with fluorosilane to form a uniform hydrophobic and oleophobic coating on the surface of the multi-level micro-nano rough structure.

[0058] Specifically, in this embodiment, in S3, after anodizing, the titanium and titanium alloy filter screen is ultrasonically treated in anhydrous ethanol and deionized water for 5 minutes, and then immersed in an anhydrous ethanol solution containing 0.3wt% fluorosilane for low surface energy modification, and then taken out from the solution after immersion for 4 hours, and then dried at 90°C for 35 minutes to complete the preparation of the self-cleaning filter screen.

[0059] Embodiment 3: A method for preparing a self-cleaning titanium and titanium alloy filter for filtering moxa smoke of the present invention comprises:

[0060] S1: Direct current is passed through the titanium and titanium alloy filter screen for heat treatment to form a highly active metastable structure on the surface of the titanium and titanium alloy filter screen.

[0061] Specifically, in this embodiment, in S1, the current density of the direct current is 100A / cm 2 , the power-on time is 300s. Take out the titanium and titanium alloy filter, clamp the arc welding machine fixture at both ends of the filter, and directly pass direct current into the filter for heat treatment. The temperature of the electrical contact heat treatment is controlled at 600℃ and cooled by water cooling.

[0062] S2: The titanium and titanium alloy filter mesh is used as an anode for anodizing treatment, and a continuous multi-level micro-nano rough structure is generated on the surface of the metastable structure to cover the surface of the titanium and titanium alloy filter mesh.

[0063] Specifically, in this embodiment, in S2, a platinum electrode is used as a cathode, and the distance between the anode of the titanium and titanium alloy filter plate and the cathode of the platinum electrode is 5 cm. Anodizing is carried out in a 0.2 mol / L Na2HPO4 electrolyte, and a magnetic stirrer is used for uniform stirring. The reaction temperature is maintained at room temperature of 25°C, the potential of anodizing is 20 V, and the time of anodizing is 8 h.

[0064] S3: The surface of the titanium and titanium alloy filter is modified with fluorosilane to form a uniform hydrophobic and oleophobic coating on the surface of the multi-level micro-nano rough structure.

[0065] Specifically, in this embodiment, in S3, after anodizing, the titanium and titanium alloy filter screen is ultrasonically treated in anhydrous ethanol and deionized water for 5 minutes, and then immersed in an anhydrous ethanol solution containing 0.2wt% fluorosilane for low surface energy modification, and then taken out from the solution after immersion for 8 hours, and then dried at 120°C for 25 minutes to complete the preparation of the self-cleaning filter screen.

[0066] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0067] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invented product is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0068] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

Claims

1. A method for preparing a self-cleaning titanium and titanium alloy filter for filtering moxa smoke, characterized in that: include: S1: passing direct current into the titanium and titanium alloy filter screen for heat treatment to form a highly active metastable structure on the surface of the titanium and titanium alloy filter screen; S2: Using the titanium and titanium alloy filter screen as an anode for anodizing treatment, a continuous multi-level micro-nano rough structure is generated on the surface of the metastable structure to cover the surface of the titanium and titanium alloy filter screen; S3: The surface of the titanium and titanium alloy filter is modified with fluorosilane to form a uniform hydrophobic and oleophobic coating on the surface of the multi-level micro-nano rough structure.

2. The method for preparing the self-cleaning titanium and titanium alloy filter for filtering moxa smoke according to claim 1, characterized in that: In S1, the current density of the direct current is 100 to 600 A / cm 2 The power-on time is 50 to 300 seconds.

3. The method for preparing the self-cleaning titanium and titanium alloy filter screen for filtering moxa smoke according to claim 1, characterized in that: In S1, the temperature of the electrical contact heat treatment is controlled at 600°C to 1050°C.

4. The method for preparing the self-cleaning titanium and titanium alloy filter screen for filtering moxa smoke according to claim 1, characterized in that: In the S2, a platinum electrode is used as a cathode and an anodic oxidation treatment is performed in an electrolyte of Na2HPO4.

5. The method for preparing the self-cleaning titanium and titanium alloy filter screen for filtering moxa smoke according to claim 4, characterized in that: The distance between the anode and the cathode is 5 cm, and the anodic oxidation treatment is carried out in an electrolyte of 0.1-0.3 mol / L Na2HPO4. During the anodic oxidation treatment, a magnetic stirrer is used for uniform stirring, the reaction temperature is maintained at 20°C-30°C, the anodic oxidation potential is 20-50V, and the time is 3-8h.

6. The method for preparing the self-cleaning titanium and titanium alloy filter for filtering moxa smoke according to claim 5, characterized in that: The potential is 30 V and the anodization time is 5 h.

7. The method for preparing the self-cleaning titanium and titanium alloy filter screen for filtering moxa smoke according to claim 1, characterized in that: In S3, after anodizing, the titanium and titanium alloy filter screens are ultrasonically treated in anhydrous ethanol and deionized water in turn; then immersed in an anhydrous ethanol solution containing fluorosilane for low surface energy modification, and dried after being taken out of the immersion.

8. The method for preparing the self-cleaning titanium and titanium alloy filter for moxa smoke according to claim 7, characterized in that: The titanium and titanium alloy filter screen is ultrasonically treated in anhydrous ethanol and deionized water for 5 minutes, immersed in an anhydrous ethanol solution containing 0.1-0.3wt% fluorosilane for 4-8 hours for low surface energy modification, and dried at 100°C for 30 minutes.

9. The method for preparing the self-cleaning titanium and titanium alloy filter for moxa smoke according to claim 8, characterized in that: The weight percentage of the fluorosilane in the anhydrous ethanol solution is 0.1wt%, and the immersion time is 6h.

10. The method for preparing the self-cleaning titanium and titanium alloy filter for moxa smoke according to claim 1, characterized in that: In S1, after the heat treatment, the titanium and titanium alloy filter screen is cooled by water cooling.

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