A method for bonding fluorinated polyolefin films based on the surface of polymer composite materials

Abstract

This invention discloses a method for bonding fluorinated polyolefin films based on the surface of a polymer composite material, comprising the following steps: S1, providing a polymer composite material matrix and texturing the surface of the matrix to obtain a texturized matrix; S2, covering the texturized matrix with a fluorinated polyolefin film and laying a metal dielectric layer on top of the fluorinated polyolefin film; S3, determining the bonding area between the matrix and the film, and performing femtosecond laser processing through the metal dielectric layer to partially melt the film and bond it to the matrix; S4, after the film below the metal dielectric layer is bonded to the matrix, moving the dielectric layer to an adjacent area, and repeating step S4 until all bonding is completed.

Description

Technical Field

[0001] This invention relates to the fields of laser processing and surface treatment, specifically a method for bonding fluorinated polyolefin films on the surface of polymer composite materials. Background Technology

[0002] Fluorinated polyolefins generally refer to a class of polymer materials in which all or part of the hydrogen atoms connected to the C-C bonds in polyolefins are replaced by fluorine atoms. Because fluorine atoms have low polarizability, the strongest electronegativity, and a small van der Waals radius, fluorinated polymers containing CF groups often have excellent heat resistance, chemical corrosion resistance, weather resistance, solvent resistance, low flammability, high light transmittance, low friction, low refractive index, low surface energy, low moisture absorption, and super oxidation resistance compared with other conventional polymers.

[0003] However, due to the low friction and low adhesion characteristics of the material itself, it is very difficult to combine fluorinated polyolefin materials with other material matrices.

[0004] Existing methods for improving the surface adhesion of fluorinated polyolefin materials often require complex chemical treatments. These typically involve modification using a sodium-naphthalene treatment solution, prepared by dissolving or complexing equal amounts of sodium and naphthalene in active ethers such as tetrahydrofuran or ethylene glycol dimethyl ether. While this method can improve adhesion, it has significant drawbacks: the treated fluorinated polyolefin film surface darkens or turns brownish-black; prolonged exposure to light significantly reduces adhesion; it generates large amounts of toxic waste liquid, poses high operational risks, and is environmentally unfriendly. Summary of the Invention

[0005] In view of this, the present invention provides a method for bonding fluorinated polyolefin films based on the surface of polymer composite materials to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention discloses a method for bonding fluorinated polyolefin films on the surface of polymer composite materials, comprising the following steps:

[0008] S1. Provide a polymer composite matrix, and perform a texturing treatment on the surface of the matrix to obtain a texturing matrix;

[0009] S2. Cover the texturalized substrate with a fluorinated polyolefin film and lay a metal dielectric layer on top of the fluorinated polyolefin film.

[0010] S3. Determine the connection area between the substrate and the thin film, and perform femtosecond laser processing through the metal dielectric layer to locally melt the thin film and connect it to the substrate;

[0011] S4. After the thin film below the metal dielectric layer is connected to the substrate, move the dielectric layer to an adjacent area and repeat step S4 until all connections are completed.

[0012] As a further aspect of the present invention: in step S1, the matrix is ​​at least one of unsaturated polyester, vinyl ester, epoxy resin, phenolic resin, bismaleimide resin, polyimide resin, polyetheretherketone and its fiber-reinforced composite materials.

[0013] As a further aspect of the present invention: in step S1, the texturing process includes laser processing of texture, sandblasting, or sandpaper polishing.

[0014] As a further aspect of the present invention: the fluorinated polyolefin is an ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene, fluorinated ethylene-propylene copolymer, polychlorotrifluoroethylene, ethylene-monochlorotrifluoroethylene copolymer, polyvinylidene fluoride, or polyvinylidene fluoride.

[0015] As a further aspect of the present invention: in step S2, the metal dielectric layer is one of copper alloy, titanium alloy, or steel whose surface has been blackened.

[0016] As a further aspect of the present invention: in step S2, the thickness of the metal dielectric layer is 0.5-10 mm.

[0017] As a further aspect of the present invention: in step S3, the femtosecond laser processing specifically comprises:

[0018] The pulsed laser intensity is set to have a Gaussian distribution in space, with an average laser power of 2-20W, a spot diameter of 20-100μm, a laser frequency of 50-200kHz, a pulse width of 100-1000fs, a wavelength of 800-1100nm, a scanning rate of 100-3000mm / s, a defocusing amount of 0, and a scanning count of 1.

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

[0020] In recent years, due to the characteristics of high brightness, high directionality, high monochromaticity and high coherence of lasers, the use of laser processing technology for the modification and surface empowerment of fluorinated polyolefin materials has attracted increasing attention.

[0021] This invention introduces a metallic dielectric layer, which improves laser energy absorption and significantly reduces energy loss during connection. Furthermore, the dielectric layer acts as a barrier, preventing the high-energy laser beam from directly penetrating the fluorinated polyolefin layer and potentially damaging the substrate material during laser scanning. The blackening treatment of the metallic dielectric layer increases its absorbance, thereby improving laser energy utilization and increasing connection speed and efficiency.

[0022] By rapidly and uniformly heating the fluorinated polyolefin material through a metal dielectric layer, the molten fluorinated polyolefin penetrates into the grooves and textures on the surface of the roughened substrate, significantly increasing the specific surface area of ​​the connection. After cooling, a stable tenon and mortise structure is formed, greatly improving the connection strength of the fluorinated polyolefin film. Attached Figure Description

[0023] Figure 1 This is a schematic diagram illustrating the process mechanism of connecting a substrate surface to a fluorinated polyolefin film using a femtosecond laser, as described in this invention.

[0024] Figure 2 This is a micrograph of the surface of the substrate material after laser texturing in Embodiment 1 of the present invention;

[0025] Figure 3 This is a physical diagram showing the actual connection effect of Embodiment 1 of the present invention;

[0026] In the diagram: 1-metal dielectric layer, 2-fluorinated polyolefin material, 3-matrix, 4-laser beam. Detailed Implementation

[0027] To facilitate understanding of the present invention, a more comprehensive description will be given below with reference to specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention.

[0028] Example 1

[0029] (1) The selected polymer composite matrix is ​​glass fiber reinforced epoxy resin composite material;

[0030] (2) Laser texturing is used to roughen the surface of the substrate material;

[0031] (3) Select polytetrafluoroethylene as the material of the fluorinated polyolefin film and blackened copper alloy as the metal dielectric layer with a thickness of 1 mm; place the metal dielectric layer on top of the substrate and the polytetrafluoroethylene film.

[0032] (4) A benchtop femtosecond laser processing system was used, with the laser processing area set to 200×200mm, the average laser power to be 10W, the spot diameter to be 20μm, the laser frequency to be 50kHz, the pulse width to be 350fs, the wavelength to be 800nm, the scanning rate to be 1500mm / s, the defocusing amount to be 0, and the number of scans to be 1. The cyclic scanning processing was carried out along the set path to make the polytetrafluoroethylene film partially melt and connect with the substrate.

[0033] (5) After the polytetrafluoroethylene film below the metal dielectric layer is connected to the substrate, move the dielectric layer to the adjacent area and repeat step (4) until all connections are completed.

[0034] Example 2

[0035] (1) The selected polymer composite matrix is ​​glass fiber reinforced polyimide resin composite material;

[0036] (2) The substrate surface is roughened by sandblasting;

[0037] (3) The material of the selected fluorinated polyolefin film is polytetrafluoroethylene, and the metal dielectric layer is selected as blackened stainless steel with a thickness of 0.8mm; the metal dielectric layer is placed on top of the substrate and the polytetrafluoroethylene film.

[0038] (4) A benchtop femtosecond laser processing system was used, with the laser processing area set to 200×200mm, the average laser power to be 20W, the spot diameter to be 80μm, the laser frequency to be 200kHz, the pulse width to be 1000fs, the wavelength to be 1000nm, the scanning rate to be 2500mm / s, the defocusing amount to be 0, and the number of scans to be 1. The system performed cyclic scanning along the set path, causing the polytetrafluoroethylene film to partially melt and bond with the substrate.

[0039] (5) After the polytetrafluoroethylene film below the metal dielectric layer is connected to the substrate, move the dielectric layer to the adjacent area and repeat step (4) until all connections are completed.

[0040] Example 3

[0041] (1) The selected polymer composite matrix is ​​glass fiber reinforced phenolic resin composite material;

[0042] (2) The substrate surface is roughened by laser texturing;

[0043] (3) The material of the selected fluorinated polyolefin film is ethylene-tetrafluoroethylene copolymer, and the metal dielectric layer is a blackened copper alloy with a thickness of 1.5 mm; the metal dielectric layer is placed on top of the substrate and the polytetrafluoroethylene film.

[0044] (4) A benchtop femtosecond laser processing system was used, with the laser processing area set to 200×200mm, the average laser power to be 15W, the spot diameter to be 100μm, the laser frequency to be 150kHz, the pulse width to be 700fs, the wavelength to be 1050nm, the scanning rate to be 3000mm / s, the defocusing amount to be 0, and the number of scans to be 1. The system performed cyclic scanning along the set path, resulting in partial melting of the ethylene-tetrafluoroethylene copolymer film and its connection to the substrate.

[0045] (5) After the ethylene-tetrafluoroethylene copolymer film below the metal dielectric layer is connected to the substrate, move the dielectric layer to the adjacent area and repeat step (4) until all connections are completed.

[0046] Comparative Example 1

[0047] (1) The selected polymer composite matrix is ​​glass fiber reinforced epoxy resin composite material;

[0048] (2) The polytetrafluoroethylene film was modified with sodium naphthalene treatment solution;

[0049] (3) Select a bonding scheme that mixes 504 glue and 701 accelerator, and paste the polytetrafluoroethylene film onto the substrate and allow it to dry completely.

[0050] Comparative Example 2

[0051] (1) The selected polymer composite matrix is ​​glass fiber reinforced polyimide resin composite material;

[0052] (2) The polytetrafluoroethylene film was modified with sodium naphthalene treatment solution;

[0053] (3) Select a bonding scheme that mixes 504 glue and 701 accelerator, and paste the polytetrafluoroethylene film onto the substrate and allow it to dry completely.

[0054] Performance testing:

[0055] The above Examples 1-2 and Comparative Examples 1-2 were subjected to peel tests after processing at a 180° angle according to GB / T 2792-2014, and glass strength tests were conducted after 360 hours of ultraviolet light irradiation. The test data are shown in Table 1 below:

[0056] Table 1

[0057]

[0058] Any range described in this invention includes the endpoint, any value between the endpoints, and any subrange consisting of the endpoint or any value between the endpoints.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0060] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0061] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A method for bonding fluorinated polyolefin films based on the surface of polymer composite materials, characterized in that, Includes the following steps: S1. Provide a polymer composite matrix, and perform a texturing treatment on the surface of the matrix to obtain a texturing matrix; S2. Cover the texturalized substrate with a fluorinated polyolefin film and lay a metal dielectric layer on top of the fluorinated polyolefin film. S3. Determine the connection area between the substrate and the thin film, and perform femtosecond laser processing through the metal dielectric layer to locally melt the thin film and connect it to the substrate; S4. After the thin film below the metal dielectric layer is connected to the substrate, move the dielectric layer to an adjacent area and repeat step S3 until all connections are completed. The fluorinated polyolefin is ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene, fluorinated ethylene-propylene copolymer, polychlorotrifluoroethylene, ethylene-monochlorotrifluoroethylene copolymer, polyvinylidene fluoride, or polyvinylidene fluoride; In step S2, the metal dielectric layer is one of copper alloy, titanium alloy, or steel whose surface has been blackened; In step S3, the femtosecond laser processing specifically involves: The pulsed laser intensity is set to have a Gaussian distribution in space, with an average laser power of 2-20W, a spot diameter of 20-100μm, a laser frequency of 50-200kHz, a pulse width of 100-1000fs, a wavelength of 800-1100nm, a scanning rate of 100-3000mm / s, a defocusing amount of 0, and a scanning count of 1.

2. The method for bonding fluorinated polyolefin films based on the surface of a polymer composite material according to claim 1, characterized in that, In step S1, the matrix is ​​at least one of unsaturated polyester, vinyl ester, epoxy resin, phenolic resin, bismaleimide resin, polyimide resin, polyetheretherketone and its fiber-reinforced composite materials.

3. The method for bonding fluorinated polyolefin films based on the surface of a polymer composite material according to claim 1, characterized in that, In step S1, the texturing process includes laser processing of texture, sandblasting, or sandpaper polishing.

4. The method for bonding fluorinated polyolefin films based on the surface of a polymer composite material according to claim 1, characterized in that, In step S2, the thickness of the metal dielectric layer is 0.5-10 mm.

Images