A frictional power generation flexible cilium film and a preparation method thereof

Abstract

The present application relates to the technical field of functional thin film material preparation; in particular, it relates to a friction power generation flexible cilium film and a preparation method thereof. The preparation method comprises the following steps: adhering a high-temperature adhesive tape to one side of a hole plate to prepare a cilium template; mixing metal particles with an organic solution to prepare a homogeneous mixed solution; coating the homogeneous mixed solution on the side of the cilium template without the high-temperature adhesive tape, performing vacuum perfusion and heating solidification, and then taking off the flexible cilium film; laying the taken-off flexible cilium film flat, spraying a polytetrafluoroethylene solution on the cilium array surface of the flexible cilium film, and drying to obtain the flexible cilium film. The friction power generation flexible cilium film provided by the present application is a bendable flexible polymer film, the cilium film has the characteristics of high flexibility, high elasticity and low cost, and can coordinate and take into account the friction power generation performance and durability of the material, and has a good application prospect in the field of friction power generation.

Description

Technical Field

[0001] This invention relates to the field of functional thin film material preparation technology; and in particular to a triboelectric flexible fibrous thin film and its preparation method. Background Technology

[0002] In the field of triboelectric power generation, the friction materials of both polarities are generally flat planar or curved thin film materials. Since the film is not perfectly smooth and has microscopic deformation and unevenness, if the contact force is small, it is impossible to ensure complete contact between the two friction surfaces, resulting in poor triboelectric power generation. If the contact force is large, the frictional resistance increases, the driving force required for the relative motion of the two friction surfaces increases, and the wear of the friction material per unit time increases, which seriously reduces the durability of the triboelectric generator.

[0003] To resolve the contradiction between the power generation performance and durability of triboelectric generators, it is urgent to develop a new functional thin film material that can be used as a friction material for triboelectric generators. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for preparing a triboelectric flexible fibrous thin film.

[0005] In a first aspect, the method for preparing the triboelectric flexible fibrous thin film provided by the present invention includes:

[0006] 1) Preparation of the fibrillated template: High-temperature adhesive tape is adhered to one side of the perforated plate to obtain the fibrillated template;

[0007] 2) Preparation of homogeneous mixed solution: Metal particles are mixed with an organic solution to obtain a homogeneous mixed solution;

[0008] 3) Preparation of flexible fibrous film: The homogeneous mixed solution is coated on the side of the fibrous template without high-temperature adhesive tape, vacuum infusion and heating curing are performed, and then the flexible fibrous film is peeled off; the peeled flexible fibrous film is laid flat, polytetrafluoroethylene solution is sprayed on the fibrous array surface of the flexible fibrous film, and dried to obtain the flexible fibrous film.

[0009] According to the present invention, if the friction material of one pole of a triboelectric generator is a flexible fibrous material, reliable contact between the fibrous material and the friction material of the other pole can be ensured, and the flexibility of the fibrous material does not increase the frictional resistance. The triboelectric generator friction material flexible fibrous film developed in this invention improves the power generation performance and durability of the triboelectric generator. The triboelectric generator flexible fibrous film provided by this invention is a bendable flexible polymer film. This fibrous film has the characteristics of high flexibility, high elasticity, and low cost, and can coordinate the triboelectric power generation performance and durability of the material, showing good application prospects in the field of triboelectric power generation.

[0010] Preferably, in step 1), the aperture of the perforated plate is 250-350 μm, the center-to-center distance between the holes is 550-650 μm, and the thickness of the perforated plate is 1-1.5 mm, the length is 40-60 mm, and the width is 40-60 mm.

[0011] Further preferred, in step 1), the high-temperature tape is a polyimide high-temperature tape.

[0012] Preferably, in step 2), the metal particles are iron particles, cobalt particles, nickel particles, or alloy particles containing at least one of iron, cobalt, and nickel; and the organic solution is a polydimethylsiloxane solution, a silica gel solution, or a polytetrafluoroethylene solution.

[0013] Further preferably, in step 2), the diameter of the metal particles is 20-100 nm; the weight ratio of the metal particles to the organic solution is 1 / 50-7 / 10.

[0014] Preferably, the preparation of the flexible fibrous film includes:

[0015] Step 1, Vacuum Infusion of the Fibrous Template: The homogeneous mixed solution is coated on the side of the fibrillary template without high-temperature tape, and vacuum infusion of the fibrillary template is performed;

[0016] Step 2, Heating and curing of flexible fiber film: The fiber template filled with homogeneous mixed solution is heated and cured in a constant temperature oven;

[0017] Step 3: Removal of the flexible fibrous film: After the cured flexible fibrous film has cooled to room temperature, first remove the high-temperature tape from the fibrous template, and then peel the flexible fibrous film off the perforated plate.

[0018] Step 4: Spraying a polytetrafluoroethylene coating: Lay the peeled flexible fibrous film flat, spray a polytetrafluoroethylene solution onto the surface of the fibrous array of the flexible fibrous film, and dry it to obtain a flexible fibrous film.

[0019] Further preferably, in step one, the conditions for vacuum injection include: lowering the vacuum pressure to below -3MPa until no more bubbles emerge, maintaining this pressure for 1 to 3 minutes, and repeating the vacuuming process 2 to 3 times.

[0020] Further preferably, in step two, the conditions for heat curing include: heating at 20–82°C for 1.5–8 hours until the homogeneous mixed solution is completely cured.

[0021] In a further preferred embodiment, in step four, a polytetrafluoroethylene solution is sprayed onto the surface of the fiber array of the flexible fiber film, and allowed to air dry naturally. This process is repeated 3 to 5 times to obtain the flexible fiber film.

[0022] Secondly, the triboelectric flexible fibrous film provided by the present invention is prepared by the aforementioned triboelectric flexible fibrous film preparation method and consists of two layers: a polymer flexible fibrous array and a polymer flexible film. The polymer flexible fibrous array consists of 3,000 to 8,000 columnar bodies, each columnar body having a diameter of 250 to 350 μm.

[0023] The beneficial effects of this invention are at least as follows:

[0024] 1) This invention uses a template method to prepare flexible fibrous films, and the perforated plate is made using existing PCB manufacturing processes. Therefore, the preparation of flexible fibrous films is simple, easy, and low in cost.

[0025] 2) The present invention has a simple manufacturing process and high process stability. It is applicable to the preparation of high-transmittance, high-elasticity, and high-flexibility fiber films from various polymer materials such as polydimethylsiloxane, silicone, and polytetrafluoroethylene.

[0026] 3) In this invention, the dielectric constant of the fibrous film is increased by adding metal particles, which is beneficial to improving the power generation performance of the triboelectric generator. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0028] Figure 1 This is a process flow diagram for preparing the triboelectric flexible fibrous thin film of the present invention;

[0029] Figure 2 This is a schematic diagram of the overall structure of the triboelectric flexible fibrous film of the present invention;

[0030] Figure 3 This is a side view of the triboelectric flexible fibrous film of the present invention.

[0031] Figure 4 This is a schematic diagram illustrating the working principle of the triboelectric flexible fibrous film of the present invention.

[0032] Figure 5 The image shows the scanning electron microscope (SEM) image of the triboelectric flexible fibrous film prepared according to the method of Example 1.

[0033] Figure reference numerals: 1—Deionized water, 2—Ciliary template, 3—Polyimide high-temperature tape, 4—Homogeneous mixed solution of nano-iron particles and polydimethylsiloxane, 5—Flexible ciliary array, 6—Friction layer. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art, or in accordance with the product instructions. Reagents or instruments used without specified manufacturers are all conventional products that can be purchased through legitimate channels.

[0035] In the following embodiments of the present invention, the polydimethylsiloxane solution used is Dow Corning 184 solution, the silica gel solution is semi-transparent 40# silica gel solution, the perforated plate material is resin glass fiber, and the perforation wall is treated with an immersion gold process.

[0036] Example 1

[0037] A flexible, triboelectric fiber film doped with iron nanoparticles, prepared by means of the following steps:

[0038] Step 1: Clean the surface of the perforated plate with deionized water, such as... Figure 1 As shown in (a). Then, use a dryer to dry the surface of the perforated plate and any remaining deionized water 1 inside the holes. Next, attach the polyimide high-temperature tape 3 to one side of the perforated plate, pressing it firmly to obtain the fibrous template 2, as shown. Figure 1 As shown in (b), the perforated plate has a length, width, and height of 50 mm, 50 mm, and 1.2 mm, respectively, and contains 7225 through holes with a diameter of 0.3 mm and a center-to-center distance of 0.6 mm.

[0039] Step 2: Add 3g of 20nm nano-iron particles and 0.4g of polydimethylsiloxane curing agent to 4g of polydimethylsiloxane solution respectively. Use a centrifugal homogenizer to stir at 3000r / min for 3min to obtain a homogeneous mixed solution of nano-iron particles and polydimethylsiloxane, 4. Figure 1 As shown in (c).

[0040] Step 3: Evenly coat one side of the homogenized mixture onto the non-polyimide high-temperature tape of the fiber template, such as... Figure 1 As shown in (d), place it in a vacuum chamber and keep the pressure inside the vacuum chamber below -3 MPa until no more bubbles emerge from the surface of the homogeneous mixed solution. Then keep it for 2 minutes. Repeat this operation 3 times.

[0041] Step 4: Place the fiber template filled with the homogeneous mixed solution into a constant temperature box and heat it at 80°C for 2 hours until the homogeneous mixed solution is completely cured.

[0042] Step 5: After the cured flexible fiber film cools to room temperature, completely remove the cured polydimethylsiloxane material from the side of the fiber template without polyimide high-temperature adhesive tape. Figure 1 As shown in (e). A flexible fibrous film with a polyimide high-temperature tape as the film substrate and polydimethylsiloxane doped with iron nanoparticles as the fibrous array is peeled off, as shown. Figure 1 As shown in (f).

[0043] Step Six: Lay the peeled flexible fibrous film flat, spray a polytetrafluoroethylene solution onto the surface of the fibrous array, and allow it to air dry naturally. Repeat this process three times to obtain a polydimethylsiloxane triboelectric flexible fibrous film doped with nano-iron particles. Its overall structure is as follows: Figure 2 As shown, the side view structure is as follows Figure 3 As shown.

[0044] The working principle of the polydimethylsiloxane triboelectric flexible fibrous film doped with iron nanoparticles prepared in Example 1 is as follows: Figure 4 As shown, after the flexible fiber array 5 comes into contact with the friction layer 6, the fibers bend due to their flexibility, which increases the contact area between the flexible fiber array and the friction layer. Therefore, even with a smaller contact force between the fibers and the friction layer, sufficient contact area can be guaranteed, improving the durability of the friction between the two. At the same time, 20nm high dielectric constant iron particles are doped into the specific flexible fiber array, which greatly improves the actual performance of the triboelectric generator. Figure 5 The image shows a scanning electron microscope image of a polydimethylsiloxane triboelectric flexible fibrous film doped with nano-iron particles. The image shows that the fibrous film prepared by this process has a fibrous spacing of about 300 μm and the fibrous particles are uniform in thickness, which shows good application prospects in the field of triboelectric power generation.

[0045] Example 2

[0046] A flexible, fibrous silicone triboelectric thin film doped with iron nanoparticles is prepared by the following steps:

[0047] Step 1: Clean the surface of the perforated plate with deionized water, then use a dryer to dry the surface and any remaining deionized water inside the perforated plate and holes. Apply adhesive tape to one side of the perforated template and press firmly to adhere it, thus obtaining the perforated template. The perforated plate has dimensions of 50mm (length), 50mm (width), and 1.6mm (height), with evenly distributed through holes of 0.5mm diameter and a center-to-center distance of 0.6mm between holes.

[0048] Step 2: Add 0.8g of iron particles with a particle size of 50nm to 4g of silica gel solution, and stir at 2000r / min for 1min using a centrifugal homogenizer to obtain a homogeneous mixed solution of iron particles and silica gel.

[0049] Step 3: Evenly coat the homogenized mixture with the tape-free side of the fibrous template, place it in a vacuum chamber, and keep the pressure inside the vacuum chamber below -3MPa until no more bubbles emerge from the surface of the homogenized mixture. Repeat this operation twice.

[0050] Step 4: Place the fiber template filled with the homogeneous mixed solution into a constant temperature chamber and heat it at 26°C for 5 hours until the homogeneous mixed solution is completely cured.

[0051] Step 5: After the cured flexible fibrous film has cooled to room temperature, remove the tape adhering to the fibrous template and then peel off the flexible fibrous film made of silicone.

[0052] Step 6: Lay the peeled flexible fibrous film flat, spray polytetrafluoroethylene solution onto the surface of the fibrous array, let it air dry naturally, repeat this process 3 times to obtain a silicone triboelectric flexible fibrous film doped with nano-iron particles.

[0053] In Example 1, a high-temperature tape was used as a flexible substrate, and the fibrillary array adhered to the high-temperature tape to form a complete flexible fibrillary film; in Example 2, the silicone solution was simultaneously cured into a fibrillary array and a flexible substrate, so the fibrillary array and the flexible substrate are integrated and have better toughness.

[0054] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A method for preparing a triboelectric flexible fibrous thin film, characterized in that, include: 1) Preparation of the fibrillated template: High-temperature adhesive tape is adhered to one side of the perforated plate to obtain the fibrillated template; The high-temperature tape is a polyimide high-temperature tape; The aperture of the perforated plate is 250~350μm, and the center-to-center distance between the holes is 550~650μm; the thickness of the perforated plate is 1~1.5mm, the length is 40~60mm, and the width is 40~60mm. 2) Preparation of homogeneous mixed solution: Metal particles are mixed with organic solution to obtain homogeneous mixed solution; the metal particles are nano-iron particles with a particle diameter of 20 nm; The organic solution is a polydimethylsiloxane solution; 3) Preparation of flexible fibrous film: The preparation of flexible fibrous film includes: Step 1, vacuum infusion of fibrous template: The homogeneous mixed solution is coated on the side of the fibrous template without high-temperature tape, and vacuum infusion of the fibrous template is performed; Step 2, heating and curing of flexible fibrous film: The fibrous template filled with homogeneous mixed solution is heated and cured in a constant temperature oven; The heating and curing conditions include: heating at 80~82℃ for 1.5~2h until the homogeneous mixed solution is completely cured; Step 3, removal of flexible fibrous film: After the cured flexible fibrous film cools to room temperature, the high-temperature tape is first removed from the fibrous template, and then the flexible fibrous film is removed from the perforated plate; Step 4, spraying polytetrafluoroethylene coating: The removed flexible fibrous film is laid flat, and polytetrafluoroethylene solution is sprayed on the surface of the fibrous array of the flexible fibrous film, and dried to obtain the flexible fibrous film.

2. The method for preparing a triboelectric flexible fiber film according to claim 1, characterized in that, The weight ratio of the metal particles to the organic solution is 1 / 50 to 7 / 10.

3. The method for preparing a triboelectric flexible fibrous thin film according to claim 1, characterized in that, In step one, the conditions for vacuum injection include: lowering the vacuum pressure to below -3 MPa until no more bubbles emerge, maintaining this pressure for 1 to 3 minutes, and repeating the vacuuming process 2 to 3 times.

4. The method for preparing a triboelectric flexible fibrous thin film according to claim 1, characterized in that, In step four, a polytetrafluoroethylene solution is sprayed onto the surface of the fiber array of the flexible fiber film, and allowed to air dry naturally. This process is repeated 3 to 5 times to obtain the flexible fiber film.

Images