High-temperature-resistant surface-non-stick composite material based on polytetrafluoroethylene film and metal base material and preparation method of high-temperature-resistant surface-non-stick composite material

Abstract

The invention discloses a high-temperature-resistant surface-non-stick composite material based on a polytetrafluoroethylene film and a metal base material and a preparation method thereof.The composite material comprises the metal base material and a PTFE film layer, and a bonding layer is arranged between the metal base material and the PTFE film layer. A PTFE film layer is laid on the surface of the metal base material, and the composite material is obtained through a high-temperature compounding technology. The composite material has the beneficial effects that the composite material film layer is compact and free of pores (micropores), and the temperature resistance, the oil resistance and the corrosion resistance are remarkably improved; the composite material is firm in compounding, wear-resistant, durable and long in service life; the production is environment-friendly, safe, reliable and free of VOC emission; the shape and the thickness are controllable, and the requirements of various molds and industries are met.

Description

Technical Field

[0001] This invention relates to the field of polymer composite materials technology, and in particular to a high-temperature resistant and non-stick composite material based on polytetrafluoroethylene film and metal substrate, and its preparation method. Background Technology

[0002] Existing high-temperature non-stick treatments for metal surfaces mostly employ PTFE spraying. However, the resulting coating has the following drawbacks: 1. The coating is prone to pores (micropores), and is susceptible to failure under long-term high temperature or chemical environment; 2. The thickness is difficult to control evenly, it is easy to peel off, has a short lifespan, and peeling can easily cause foreign objects to be exposed. 3. The spraying process involves solvent and VOC emissions, which is not environmentally friendly.

[0003] Therefore, there is an urgent need for a process that can form a continuous, dense, and firmly bonded film on the metal surface to improve non-stickiness and durability. To this end, a high-temperature resistant and non-stick composite material based on polytetrafluoroethylene film and metal substrate and its preparation method were designed. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems by designing a high-temperature resistant and non-stick composite material based on polytetrafluoroethylene film and metal substrate, and its preparation method.

[0005] To achieve the above objectives, the technical solution of the present invention is a high-temperature resistant and non-stick composite material based on a polytetrafluoroethylene film and a metal substrate, comprising a metal substrate and a PTFE film layer, wherein an adhesive layer is provided between the metal substrate and the PTFE film layer.

[0006] As a further description of this technical solution, the PTFE film layer is selected from PTFE glass fiber reinforced film, PTFE aramid fiber reinforced film, PTFE multilayer composite film, PTFE extruded film, PTFE / PFA co-extruded film, PTFE cast (cast) film, and transparent or colored films in multilayer composite form thereof.

[0007] As a further description of this technical solution, the PTFE thin film layer is laminated onto the surface of a metal substrate through a high-temperature lamination process to form a continuous film layer that is essentially free of pores or micropores.

[0008] As a further description of this technical solution, the thickness of the PTFE film layer is 4–400 μm, and the composite surface of the PTFE film layer is surface-treated or untreated before lamination. The treatment method is selected from surface roughening treatment, surface embossing, corona treatment, sodium naphthalene etching, sodium ammonia etching or plasma treatment.

[0009] As a further description of this technical solution, the adhesive layer includes one or more fluororesin materials, and the adhesive layer also contains modified resins or additives to improve adhesion, or high-temperature resistant adhesive materials.

[0010] As a further description of this technical solution, the fluororesin material is selected from ETFE, PVDF, THV, ECTFE, PCTFE, FEP, PFA or their copolymers, mixtures or films or sheets, and the adhesive layer thickness is 5μm to 400μm, and is a single-layer or multi-layer co-extrusion, coating or stacking structure.

[0011] As a further description of this technical solution, the adhesive layer contains a modified resin or a high-temperature resistant adhesive material. The modified resin is selected from polyimide (PI), polyethersulfone (PES), polyetheretherketone (PEEK), or a high-temperature resistant silicone modified resin to improve adhesion performance. The high-temperature resistant adhesive material includes, but is not limited to, polyamide hot melt adhesive, polyurethane hot melt adhesive, polyolefin copolymer hot melt adhesive, or a mixture of modified resin, fluororesin, and additives.

[0012] As a further description of this technical solution, the metal substrate is aluminum, stainless steel, carbon steel or titanium, and before lamination, it undergoes one or more of the following processes: wire drawing, pickling, sandblasting, etching, application of anti-corrosion coating, application of heat insulation layer, application of modified resin or additive layer, application of thermally conductive layer, application of electromagnetic shielding functional layer, ultrasonic cleaning, detergent cleaning, solvent cleaning, polishing, corona treatment and plasma treatment. The lamination temperature is 260–400℃, the pressure is 1–10 bar, and the duration is 2–30 min.

[0013] As a further description of this technical solution, the composite material can be punched or not after completion, or it can be formed by die stamping. During stamping, the edge of the metal substrate can be turned so that the PTFE film layer and the metal substrate are located inside.

[0014] A method for preparing a high-temperature resistant and non-stick composite material based on polytetrafluoroethylene film and metal substrate includes the following steps: Step 1: Perform surface pretreatment on the metal substrate. The back of the metal substrate may be provided with an anti-corrosion coating, a heat insulation layer, a modified resin or additive coating, or a back layer with thermal conductivity or electromagnetic shielding function, or polytetrafluoroethylene film may be laminated on both sides of the metal substrate. Step 2: Lay a PTFE film layer on the surface of the metal substrate. The PTFE film layer contains high-temperature resistant pigments, inorganic color powders or fluoropolymer compatible masterbatches to achieve the coloring or appearance identification function of the film. Step 3: High-temperature composite process is adopted, including high-temperature flat plate hot pressing, high-temperature hot rolling, continuous hot pressing of laminator, double steel strip equal pressure pressing, high-temperature roll pressing (hot roll composite), adhesive coating and heat sealing or a combination thereof, and lamination is carried out at 260–400℃ and 1–10 bar to obtain composite material; The composite material is used in high-temperature mold demolding, anti-sticking, food processing, food baking, composite material hot pressing, automotive parts manufacturing molds, aerospace or medical fields; The composite material can also be used as a surface layer for high-temperature conveyor belts, a lining for hot pressing molds, a surface for vacuum forming molds, industrial release pads and covering materials, an anti-stick surface for medical devices, a liner for experimental equipment, and a surface for guide rollers used in the production of lithium battery separators.

[0015] Its beneficial effects are as follows: 1. The composite material film layer of this technical solution is dense and non-porous (microporous), which significantly improves its temperature resistance, oil resistance and corrosion resistance; 2. The composite material in this technical solution is firmly bonded, wear-resistant, durable, and has a long service life; 3. The composite material production of this technical solution is environmentally friendly, safe, and reliable, with no VOC emissions; 4. The shape and thickness of the composite material in this technical solution are controllable, adapting to various molds and industry needs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the PTFE thin film-metal composite structure of the present invention; Figure 2 These are schematic diagrams illustrating different composite methods of the present invention. Detailed Implementation

[0017] First, let me explain the design intent of this invention. Existing high-temperature non-stick treatments for metal surfaces mostly employ PTFE spraying. However, the sprayed coating has the following drawbacks: 1. The coating is prone to pores (micropores), which can easily fail under long-term high temperatures or chemical environments; 2. The thickness is difficult to control uniformly, leading to easy peeling, short lifespan, and the risk of foreign matter from peeling; 3. The spraying process involves solvent and VOC emissions, which is not environmentally friendly. Therefore, this invention designs a high-temperature resistant and non-stick composite material based on a polytetrafluoroethylene film and a metal substrate, as well as its preparation method.

[0018] The present invention will now be described in detail with reference to the accompanying drawings, such as... Figure 1 As shown, a high-temperature resistant and non-stick composite material based on a polytetrafluoroethylene film and a metal substrate includes a metal substrate and a PTFE film layer, wherein an adhesive layer is disposed between the metal substrate and the PTFE film layer.

[0019] The PTFE film layer will be described in detail below. The PTFE film layer is selected from PTFE glass fiber reinforced film, PTFE aramid fiber reinforced film, PTFE multilayer composite film, PTFE extruded film, PTFE / PFA co-extruded film, PTFE cast (cast) film and its multilayer composite transparent film or colored film. Co-extruded film can improve interfacial fusion and mechanical strength, and enhance the continuity and density of the film layer. Glass fiber or aramid fiber reinforced films can significantly improve abrasion resistance, tear resistance and dimensional stability, making them suitable for high-stress applications.

[0020] In some embodiments, the PTFE film may be a transparent film or a colored film.

[0021] The coloring can be achieved by adding metal oxide pigments, fluoropolymer compatible masterbatches, high-temperature resistant inorganic pigment powders or other high-temperature resistant colorants to the PTFE raw material, with the preferred addition amount being 0.1–5 wt%.

[0022] The aforementioned additives are stable during the lamination process and do not affect the structural density and non-stick properties of the PTFE film. They can be used to improve appearance identification, product grading, and decorative effects, thereby broadening the application range of composite materials.

[0023] The PTFE film layer is laminated onto the surface of a metal substrate through a high-temperature lamination process to form a continuous film layer that is essentially free of pores or micropores. The thickness of the PTFE film layer is 4–400 μm, preferably 20–80 μm. The composite surface of the PTFE film layer is surface-treated or untreated before lamination. The treatment method is selected from surface roughening treatment, surface embossing, corona treatment, sodium naphthalene etching, sodium ammonia etching, or plasma treatment.

[0024] In another alternative embodiment, PTFE films can be laminated to both sides of the metal substrate.

[0025] The adhesive layer will be described in detail below. The adhesive layer comprises one or more fluoropolymer materials and may also contain modified resins or additives to improve adhesion, or high-temperature resistant adhesive materials. The fluoropolymer materials are selected from ETFE, PVDF, THV, ECTFE, PCTFE, FEP, PFA, or copolymers, mixtures, films, or sheets thereof. The adhesive layer thickness is from 5 μm to 400 μm and is a single-layer or multi-layer co-extrusion, coating, or stacked structure.

[0026] The adhesive layer contains a modified resin or a high-temperature resistant adhesive material. The modified resin is selected from polyimide (PI), polyethersulfone (PES), polyetheretherketone (PEEK), or a high-temperature resistant silicone modified resin to improve adhesion performance. The high-temperature resistant adhesive material includes, but is not limited to, polyamide hot melt adhesive, polyurethane hot melt adhesive, polyolefin copolymer hot melt adhesive, or a mixture of modified resin, fluororesin, and additives.

[0027] In some embodiments, the adhesive layer may be further formed by mixing fluoropolymer with other modified resins (such as polyimide, PES, PEEK or high-temperature silicone modified resin) to improve interfacial adhesion and interlayer fusion strength.

[0028] With the above structure, the adhesive layer can achieve excellent melt bonding performance during high-temperature lamination, forming a dense and strong interfacial bond between the PTFE film and the metal substrate, thereby significantly improving the adhesion and service life of the composite material.

[0029] The following details the metal substrate, which is aluminum, stainless steel, carbon steel, or titanium. Before lamination, the substrate undergoes one or more of the following processes: wire drawing, pickling, sandblasting, etching, application of anti-corrosion coating, application of heat insulation layer, application of modified resin or additive layer, application of thermally conductive layer, application of electromagnetic shielding functional layer, ultrasonic cleaning, detergent cleaning, solvent cleaning, polishing, corona treatment, and plasma treatment. The lamination temperature is 260–400℃, the pressure is 1–10 bar, and the duration is 2–30 min.

[0030] In some embodiments, the back side of the metal substrate may be further provided with an anti-corrosion coating, a heat insulation layer, a modified resin or additive coating, or a back layer with thermal conductivity or electromagnetic shielding functions. The anti-corrosion coating may be selected from fluororesin coatings, epoxy coatings, ceramic coatings, or inorganic protective coatings; the heat insulation layer may be selected from polyimide film, ceramic heat insulation film, fiberglass heat insulation cotton, or other high-temperature resistant heat insulation materials; the modified resin or additive includes, but is not limited to, polyimide (PI), polyetheretherketone (PEEK), polyethersulfone (PES), high-temperature resistant silicone modified resin, etc.; the thermally conductive or electromagnetic shielding functional layer may be selected from a metal powder filling layer or a conductive coating. The configuration of the back functional layer can enhance the overall composite panel's chemical resistance, thermal insulation, lifespan, thermal conductivity, or electromagnetic shielding.

[0031] After the composite material is completed, it may or may not be punched, or it may be formed by die stamping. During stamping, the edge of the metal substrate can be turned so that the PTFE film layer and the metal substrate are located inside.

[0032] The following describes in detail a method for preparing a high-temperature resistant and non-stick composite material based on polytetrafluoroethylene film and a metal substrate, including the following steps: Step 1: Perform surface pretreatment on the metal substrate. The back of the metal substrate may be provided with an anti-corrosion coating, a heat insulation layer, a modified resin or additive coating, or a back layer with thermal conductivity or electromagnetic shielding function, or polytetrafluoroethylene film may be laminated on both sides of the metal substrate. Step 2: Lay a PTFE film layer on the surface of the metal substrate. The PTFE film layer contains high-temperature resistant pigments, inorganic color powders or fluoropolymer compatible masterbatches to achieve the coloring or appearance identification function of the film. Step 3: High-temperature composite process is adopted, including high-temperature flat plate hot pressing, high-temperature hot rolling, continuous hot pressing of laminator, double steel strip equal pressure pressing, high-temperature roll pressing (hot roll composite), adhesive coating and heat sealing or a combination thereof, and lamination is carried out at 260–400℃ and 1–10 bar to obtain composite material; Figure 2 (a) is a flat plate hot-pressing lamination method; Figure 2 (b) is a continuous composite method of double-roller pressing (high-temperature roller pressing); Figure 2 (c) is a heat-sealing method where an adhesive layer is coated on the metal surface and then hot-pressed to form a composite structure.

[0033] All methods can achieve a strong bond between the PTFE film layer and the metal substrate. The illustrations are for illustrative purposes only and do not limit specific dimensions, roller positions, or proportions.

[0034] The composite material is used in high-temperature mold demolding, anti-sticking, food processing, food baking, composite material hot pressing, automotive parts manufacturing molds, aerospace or medical fields; The composite material can also be used as a surface layer for high-temperature conveyor belts, a lining for hot pressing molds, a surface for vacuum forming molds, industrial release pads and covering materials, an anti-stick surface for medical devices, a liner for experimental equipment, and a surface for guide rollers used in the production of lithium battery separators.

[0035] PTFE film surface treatment Before lamination, the PTFE film composite surface may or may not undergo surface modification.

[0036] Modification methods include, but are not limited to: surface roughening treatment, surface texturing, corona treatment, sodium naphthalene etching, sodium ammonia etching, and plasma treatment.

[0037] Metal surface pretreatment Before lamination, the metal surface must undergo at least one of the following treatment steps: Wire drawing, pickling, sandblasting, etching, application of anti-corrosion coating, application of heat insulation layer, application of modified resin or additive layer, application of thermally conductive layer, application of electromagnetic shielding layer, ultrasonic cleaning, detergent cleaning, solvent cleaning, polishing, corona treatment, plasma treatment.

[0038] Lamination conditions Lamination temperature: 260–400℃, preferably 290–360℃; lamination pressure: 1–10 bar, preferably 2–5 bar; lamination time: 2–30 min.

[0039] Post-processing steps After lamination, the following post-processing can be performed: punching or not punching; stamping can be performed to obtain different structures and shapes according to the application; the metal edge can be turned up during stamping so that the film and metal are located inside; or it can be used directly as a flat material such as composite steel strip or steel sheet.

[0040] Composite method The lamination can be achieved through various high-temperature composite methods, including but not limited to: High-temperature flatbed hot pressing; high-temperature hot rolling; continuous hot pressing in a laminator; double-strand equal-pressure high-temperature roll pressing (hot roll lamination); adhesive-coated heat sealing (hot pressing after coating an adhesive on a metal or film surface); or combinations thereof. Depending on the product size and thickness, continuous or intermittent lamination processes can be selected. Through any of the above high-temperature lamination processes, a dense bond and firm adhesion between the PTFE film and the metal substrate can be achieved, resulting in a uniform, non-porous film with high adhesion. Lamination can be performed under vacuum or an inert atmosphere to prevent bubble formation and improve interfacial bonding quality.

[0041] The following will describe the details with reference to the embodiments: Example 1 Substrate: 2mm stainless steel; Membrane layer: Three-layer PTFE extruded membrane (30μm each); Surface treatment: Surface embossing Adhesive layer: FEP emulsion + modified resin polyimide (PI); Metal treatment: Sandblasting + plasma treatment; Composite method: Double steel belt equal pressure, 320℃, 5 bar, 15 min; Post-processing: punching, stamping and flanging.

[0042] Result: Strong bonding force, suitable for demolding automotive molds, and excellent wear resistance.

[0043] Example 2 Substrate: Titanium alloy foil; Membrane: PTFE multilayer composite membrane, total thickness 80μm; Surface treatment: Sodium ammonia etching; Adhesive layer: PFA emulsion + polyethersulfone (PES); Metal treatment: pickling + corona treatment + modified resin; Composite method: High-temperature flat plate hot pressing, 300℃, 3 bar, 10 min; Result: A dense composite film is formed, which is suitable for demolding scenarios in high-end medical or food molds.

[0044] Example 3 Substrate: 1mm aluminum plate; Film layer: 25μm PTFE cast (cast) film; Surface treatment: sodium naphthalene etching; Adhesive layer: PFA film; Metal treatment: pickling + ultrasonic cleaning; Composite method: continuous hot pressing in a laminator at 330℃, 3 bar, for 10 minutes; Results: The composite surface is smooth and dense, and its non-stickiness is stable after 1000 cycles.

[0045] Example 4 Substrate: 0.3mm stainless steel strip; Membrane: 50μm PTFE extruded membrane; Surface treatment: Surface roughening treatment Adhesive layer: FEP film + high-temperature resistant silicone modified resin; Metal treatment: Sandblasting + application of anti-corrosion coating; Composite method: A continuous high-temperature roller pressing device is used for double roller pressing. The surface temperature of the upper and lower heating rollers is set to 330℃, the roller gap pressure is about 4 bar, and the belt speed is 0.5m / min.

[0046] Post-processing: After cooling and setting, cut into 100mm×100mm samples.

[0047] Results: The composite interface is dense and uniform, with no bubbles or delamination, and the peel strength is 2.3 N / mm; the film surface is smooth and has excellent non-stick properties, and can be used for the production of continuous conveyor belts or metal coated sheets.

[0048] Example 5 Substrate: 0.8mm aluminum plate; Film layer: 80μm PTFE cast film; Membrane surface treatment: Corona treatment Adhesive layer: PEEK + hot melt adhesive; Metal treatment: pickling + ultrasonic cleaning + modified resin treatment; Composite method: hot pressing with a flat plate hot press at a temperature of 310℃, a pressure of 3 bar, and a time of 12 minutes; after hot pressing, the material is allowed to cool naturally.

[0049] Results: The film layer is tightly bonded to the metal surface, with a peel strength of approximately 2.0 N / mm, and no peeling occurs after 48 hours of continuous temperature resistance at 350℃; it can be used in high-temperature non-stick applications such as food molds and baking plates.

[0050] Example 6 Substrate: 1mm stainless steel; Membrane layer: 0.5 wt% Fe2O3 coloring pigment is added to PTFE membrane, extruded to form a reddish-brown membrane, and then multilayer composited to form a PTFE multilayer composite membrane; Membrane surface treatment: Plasma treatment; Adhesive layer: Fluoropolymer mixture Composite method: High-temperature hot rolling, 320℃, 3 bar, 15 min; Results: The interface bond was strong, the film color was uniform, and the temperature resistance and non-stick properties were not affected.

[0051] 1. The composite material film of this technical solution is dense and non-porous (microporous), which significantly improves its temperature resistance, oil resistance and corrosion resistance; 2. The composite material in this technical solution is firmly bonded, wear-resistant, durable, and has a long service life; 3. The composite material production of this technical solution is environmentally friendly, safe, and reliable, with no VOC emissions; 4. The shape and thickness of the composite material in this technical solution are controllable, adapting to various molds and industry needs.

[0052] The above technical solutions only embody the preferred technical solutions of the present invention. Any modifications that may be made by those skilled in the art to certain parts thereof embody the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A high-temperature resistant and non-stick composite material based on polytetrafluoroethylene film and a metal substrate, characterized in that, It includes a metal substrate and a PTFE film layer, with an adhesive layer disposed between the metal substrate and the PTFE film layer.

2. The high-temperature resistant and non-stick composite material based on polytetrafluoroethylene film and metal substrate according to claim 1, characterized in that, The PTFE film layer is selected from PTFE glass fiber reinforced film, PTFE aramid fiber reinforced film, PTFE multilayer composite film, PTFE extruded film, PTFE / PFA co-extruded film, PTFE cast (cast) film, and transparent or colored films in multilayer composite form thereof.

3. The high-temperature resistant and non-stick composite material based on polytetrafluoroethylene film and metal substrate according to claim 1, characterized in that, The PTFE film layer is laminated onto the surface of the metal substrate through a high-temperature lamination process to form a continuous film layer that is essentially free of pores or micropores.

4. The high-temperature resistant and non-stick composite material based on polytetrafluoroethylene film and metal substrate according to claim 1, characterized in that, The thickness of the PTFE film layer is 4–400 μm. The composite surface of the PTFE film layer is surface-treated or untreated before lamination. The treatment method is selected from surface roughening treatment, surface embossing, corona treatment, sodium naphthalene etching, sodium ammonia etching or plasma treatment.

5. The high-temperature resistant and non-stick composite material based on polytetrafluoroethylene film and metal substrate according to claim 1, characterized in that, The adhesive layer comprises one or more fluororesin materials, and the adhesive layer also contains modified resins or additives to improve adhesion, or high-temperature resistant adhesive materials.

6. The high-temperature resistant and non-stick composite material based on polytetrafluoroethylene film and metal substrate according to claim 5, characterized in that, The fluororesin material is selected from ETFE, PVDF, THV, ECTFE, PCTFE, FEP, PFA or their copolymers, mixtures or films or sheets, and the adhesive layer thickness is from 5μm to 400μm, and is a single-layer or multi-layer co-extrusion, coating or stacking structure.

7. The high-temperature resistant and non-stick composite material based on polytetrafluoroethylene film and metal substrate according to claim 1, characterized in that, The adhesive layer contains a modified resin or a high-temperature resistant adhesive material. The modified resin is selected from polyimide (PI), polyethersulfone (PES), polyetheretherketone (PEEK), or a high-temperature resistant silicone modified resin to improve adhesion performance. The high-temperature resistant adhesive material includes, but is not limited to, polyamide hot melt adhesive, polyurethane hot melt adhesive, polyolefin copolymer hot melt adhesive, or a mixture of modified resin, fluororesin, and additives.

8. The high-temperature resistant and non-stick composite material based on polytetrafluoroethylene film and metal substrate according to claim 1, characterized in that, The metal substrate is aluminum, stainless steel, carbon steel, or titanium, and before lamination, it undergoes one or more of the following processes: wire drawing, pickling, sandblasting, etching, application of anti-corrosion coating, application of heat insulation layer, application of modified resin or additive layer, application of thermally conductive layer, application of electromagnetic shielding functional layer, ultrasonic cleaning, detergent cleaning, solvent cleaning, polishing, corona treatment, and plasma treatment. The lamination temperature is 260–400℃, the pressure is 1–10 bar, and the duration is 2–30 min.

9. The high-temperature resistant and non-stick composite material based on polytetrafluoroethylene film and metal substrate according to claim 1, characterized in that, After the composite material is completed, it may or may not be punched, or it may be formed by die stamping. During stamping, the edge of the metal substrate can be turned so that the PTFE film layer and the metal substrate are located inside.

10. A method for preparing a high-temperature resistant and non-stick composite material based on a polytetrafluoroethylene film and a metal substrate, characterized in that, Includes the following steps: Step 1: Perform surface pretreatment on the metal substrate. The back of the metal substrate may be provided with an anti-corrosion coating, a heat insulation layer, a modified resin or additive coating, or a back layer with thermal conductivity or electromagnetic shielding function, or polytetrafluoroethylene film may be laminated on both sides of the metal substrate. Step 2: Lay a PTFE film layer on the surface of the metal substrate. The PTFE film layer contains high-temperature resistant pigments, inorganic color powders or fluoropolymer compatible masterbatches to achieve the coloring or appearance identification function of the film. Step 3: High-temperature composite process is adopted, including high-temperature flat plate hot pressing, high-temperature hot rolling, continuous hot pressing of laminator, double steel strip equal pressure pressing, high-temperature roll pressing (hot roll composite), adhesive coating and heat sealing or a combination thereof, and lamination is carried out at 260–400℃ and 1–10 bar to obtain composite material; The composite material is used in high-temperature mold demolding, anti-sticking, food processing, food baking, composite material hot pressing, automotive parts manufacturing molds, aerospace or medical fields; The composite material can also be used as a surface layer for high-temperature conveyor belts, a lining for hot pressing molds, a surface for vacuum forming molds, industrial release pads and covering materials, an anti-stick surface for medical devices, a liner for experimental equipment, and a surface for guide rollers used in the production of lithium battery separators.

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