Polyether ketone ketone high-temperature-resistant wear-resistant non-stick coating and preparation method thereof

Abstract

The invention discloses a polyetherketoneketone high-temperature-resistant wear-resistant non-stick coating and a preparation method thereof. The coating is prepared from the following components in parts by mass: 13 to 30 parts of a resin matrix group (containing 12 to 25 parts of titanium modified polyether ketone ketone resin, 1 to 5 parts of fluorine-free viscous resin and 0.65 to 6 parts of aluminum oxide), 0.5 to 3 parts of a nano reinforced group (containing 0.5 to 3 parts of KH-550 modified nano titanium dioxide, 0.025 to 0.6 part of cerium dioxide and 0.5 to 3 parts of boron nitride) and 62 to 71 parts of an auxiliary agent group. The preparation method comprises the following steps: 1) taking diphenyl ether, paraphthaloyl chloride and isophthaloyl chloride as monomers, and synthesizing titanium modified polyether ketone ketone resins with different viscosities through segmented polymerization (1.5-2.0 hours or 3.0-4.0 hours); 2) respectively preparing a smooth bottom layer water dispersion slurry and a wrinkled surface layer water dispersion slurry; and (3) forming a compact bottom layer and a micro-wrinkle surface layer on the base material by adopting a layered spraying and stepped sintering process (280-320 DEG C, 10-20 minutes). The whole system of the coating is fluorine-free and has temperature resistance gt; the coating has the characteristics of high temperature resistance (350DEG C), wear resistance (Taber wear rate of 3-5mg / 1000r), non-sticking (contact angle gt, 100 DEG C) and heavy corrosion resistance, and is suitable for cooking utensils and chemical equipment.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to a high-temperature resistant, wear-resistant, and non-stick polyether ketone ketone coating and its preparation method. Background Technology

[0002] In modern industry and daily life, polyetherketoneketone (PEKK), as a high-performance thermoplastic polymer, is widely favored for its excellent mechanical strength, superior chemical resistance, good biocompatibility, and stable physical properties even at high temperatures. Especially in high-tech fields such as aerospace, medical implants, automotive manufacturing, and electronics, the application of PEKK materials is becoming increasingly widespread. However, with increasingly harsh application environments, especially under extreme high-temperature and high-wear conditions, the performance of PEKK materials often falls short of requirements.

[0003] To improve the high-temperature resistance, wear resistance, and non-stick properties of PEKK, researchers have conducted various modification attempts. Titanium modification is an effective method; by introducing titanium, not only can the heat resistance of PEKK be enhanced, but its mechanical strength and wear resistance can also be improved. Various methods exist for preparing titanium-modified PEKK, but most involve complex chemical reactions and high costs. Therefore, developing an efficient and economical process for preparing titanium-modified PEKK is particularly important.

[0004] Furthermore, nano-sized titanium dioxide, as a functional nanomaterial, has been widely used in coatings, plastics, rubber, and other fields due to its excellent ultraviolet shielding properties, photocatalytic activity, and high chemical stability. Combining nano-sized titanium dioxide with titanium-modified PEKK is expected to further improve the overall performance of the composite material, especially its wear resistance and chemical corrosion resistance.

[0005] Although the applications of polyetherketone ketone and nano-sized titanium dioxide are relatively mature in their respective fields, research on combining the two to form high-performance composite coatings is still rare. Therefore, developing a composite coating that combines wear resistance and high temperature resistance with advantages over combining the two alone has significant scientific and practical application value.

[0006] Polyether ketone (PEK) coatings generally lack non-stick properties. Currently, patents exist for increasing non-stick performance by adding one or more fluoropolymers (PTFE, PFA, ECTFE, ETFE, PCTFE, PVDF) to the PEV system. However, this method reduces coating hardness, scratch resistance, and adhesion. To impart non-stick properties to the coating without sacrificing surface abrasion resistance and adhesion, and to address the impending international PFAS (per- and polyfluoroalkyl) fluorine ban in 2027, this invention utilizes resins of varying molecular weights and, through formulation design and processing, creates a unique irregular microstructure in the coating. This results in dense micro-folds on the surface, enhancing both hydrophobicity and oleophobicity. Summary of the Invention

[0007] This application provides a polyether ketone ketone high-temperature resistant, wear-resistant, and non-stick coating, which solves the technical problem that existing coatings are difficult to balance high-temperature resistance, wear resistance, and non-stick properties under fluorine-free conditions.

[0008] To achieve the above objectives, the coating composition of the above-mentioned polyether ketone ketone high-temperature resistant, wear-resistant, and non-stick coating comprises the following components:

[0009] The preparation method of the above-mentioned polyether ketone ketone high-temperature resistant and wear-resistant non-stick coating includes the following steps: Step 1: Synthesis of polyetherketoneketone resin: Esterification reaction: In a nitrogen-protected reactor, add 40-60 kg of diphenyl sulfone solvent, 20.0-40.0 kg of diphenyl ether monomer, and 1.1-2.4 kg of tetraisopropyl titanate catalyst, and carry out the esterification reaction at 65-75℃ for 0.5-1.0 h. Oligomer formation: Add 20.0-40.0 kg of terephthaloyl chloride and 20.0-40.0 kg of isophthaloyl chloride, and 4.0-8.0 kg of xylene solvent. Heat to 120-150℃ and react for 0.5-1.0 h, then heat to 250-320℃ for polymerization. Segmented polymerization and viscosity control: Low viscosity resin: The resin was polymerized at 280℃ for 1.5 to 2.0 hours, and the reaction was terminated by adding 0.3 mol of benzoyl chloride. The viscosity of the prepared resin was stable at ≤500 mPa·s. High viscosity resin: After polymerization under the same conditions for 3.0 to 4.0 hours, 0.3 mol of isophthaloyl chloride is added to extend the chain, and the resulting resin has a viscosity ≥2000 mPa·s; Post-treatment: The reactants were neutralized with hydrochloric acid, washed with ethanol, and washed with deionized water seven times. They were then dried at 80°C for 24 hours to obtain resin powder.

[0010] Step 2: Preparation of layered slurry: Smooth underlayer slurry: 20 parts low viscosity resin + 3 parts polyethersulfone + 3 parts alumina + additive group (60 parts deionized water + 1.5 parts leveling agent + 1.5 parts dispersant), solid content 25%~40%; Wrinkled surface layer slurry: 18 parts low viscosity resin + 12 parts high viscosity resin + 2 parts nano TiO2 + 1.5 parts boron nitride (5% of total resin) + 3 parts polyethersulfone + 3 parts alumina + additive group (56 parts deionized water + 1.5 parts leveling agent + 1.5 parts dispersant), solid content 25%~40%; Step 3: Gradient coating and sintering: The first stage is the smooth base layer forming, which includes substrate pretreatment (aluminum alloy sandblasting (Sa2.5 grade)), spraying (wet film thickness 0.05~0.1mm), and sintering (280℃~320℃, 10~15 minutes, to form a dense layer with porosity <5%).

[0011] The second stage is the formation of the wrinkled surface layer, which includes spraying a wrinkled slurry (wet film thickness 0.15~0.22mm) onto the smooth layer and sintering (280℃~320℃, 15~20 minutes, to form a micro-wrinkled structure with a porosity of 15-20%).

[0012] The total coating thickness is 0.08–1.5 mm.

[0013] In the above-mentioned method for preparing a high-temperature resistant, wear-resistant, and non-stick polyether ketone ketone coating, the thickness of the second coating layer is greater than the thickness of the first coating layer, and the ratio of the thickness of the second coating layer to the thickness of the first layer is (3:2).

[0014] According to the above embodiments, a high-temperature resistant, wear-resistant, and non-stick polyether ketone ketone coating and its preparation method thereof have the following advantages: 1. The addition of nano-sized titanium dioxide significantly improves the coating's wear resistance, high-temperature resistance, and chemical corrosion resistance.

[0015] 2. The combined effect of polyether ketone resin and fluorine-free adhesive resin enables the coating to maintain a stable chemical structure and excellent mechanical properties at high temperatures.

[0016] 3. The introduction of titanium-modified polyether ketone resin significantly improves the high temperature resistance and wear resistance of the coating; the addition of nano-sized titanium dioxide further enhances the wear resistance, chemical corrosion resistance and ultraviolet shielding performance of the coating; the coating preparation process is simple, has good repeatability, and is easy for industrial production.

[0017] 4. Adjust the molecular chain length to control the viscosity of the system as the polymerization reaction time progresses, thereby adjusting the viscosity value.

[0018] 5. Applying two layers of titanium-modified polyether ketone resin can significantly improve coating performance, optimize coating structure, and meet specific application requirements. This coating design has broad application prospects in aerospace, automotive, and electronics industries.

[0019] 6. Low-viscosity titanium-modified polyether ketone resin is spread on the substrate to form a uniform coating and increase adhesion; while high-viscosity titanium-modified polyether ketone resin may form a thicker coating. Under the same baking process, high-viscosity and low-viscosity titanium-modified polyether ketone resins form a continuous phase and a discontinuous phase island structure. These microstructures give the coating surface fine wrinkles, which improves hydrophobicity and oleophobicity. Attached Figure Description

[0020] Figure 1 Synthetic reaction route of titanium-modified PEKK; Figure 2 Flowchart for the preparation of polyetherketoneketone high-temperature resistant, wear-resistant, and non-stick coating; Figure 3 Comparison of the temperature resistance and corrosion resistance of the coatings in various embodiments; Figure 4 Example 1: Schematic diagram of coating contact angle; Figure 5 Example 2: Schematic diagram of coating contact angle; Figure 6 Example 3: Schematic diagram of coating contact angle; Figure 7 Example 1: Macroscopic structure diagram of the coating; Figure 8 Example 2: Macroscopic structure diagram of the coating; Figure 9 Example 3: Macroscopic structure diagram of the coating; Figure 10 Example 1: Microstructure diagram of the coating; Figure 11 Example 2: Coating microstructure diagram Figure 12 Example 3: Coating microstructure diagram. Detailed Implementation

[0021] To make the technical solution, innovative features and technical effects of the present invention clearer, the following description, in conjunction with the accompanying drawings and specific embodiments, further illustrates the polyether ketone ketone high-temperature resistant and wear-resistant non-stick coating and its preparation method.

[0022] Reference Appendix Figures 1 to 12 A high-temperature resistant, wear-resistant, and non-stick polyether ketone coating and its preparation method, comprising the following steps: Step 1: Synthesis of titanium-modified resin ( Figure 1 ): Esterification reaction: In a nitrogen-protected reactor, add 40-60 kg of diphenyl sulfone solvent, 20.0-40.0 kg of diphenyl ether monomer, and 1.1-2.4 kg of tetraisopropyl titanate catalyst, and carry out the esterification reaction at 65-75℃ for 0.5-1.0 h. Oligomer formation: Add 20.0-40.0 kg of terephthaloyl chloride and 20.0-40.0 kg of isophthaloyl chloride, and 4.0-8.0 kg of xylene solvent. Heat to 120-150℃ and react for 0.5-1.0 h, then heat to 250-320℃ for polymerization. Segmented polymerization and viscosity control: Low viscosity resin: Polymerize at 280℃ for 1.5 to 2.0 hours, then add 0.3 kg of benzoyl chloride to terminate the reaction. The prepared resin has a stable viscosity ≤500 mPa·s. High viscosity resin: After polymerization under the same conditions for 3.0 to 4.0 hours, 0.3 kg of isophthaloyl chloride is added to extend the chain, and the resulting resin has a viscosity ≥ 2000 mPa·s; Post-treatment: The reactants were neutralized with hydrochloric acid, washed with ethanol and deionized water seven times, and dried at 80°C for 24 hours.

[0023] Step 2: Preparation of layered slurry: Smooth underlayer slurry: 20 parts low viscosity resin + 3 parts polyethersulfone + 3 parts alumina + additive group (60 parts deionized water + 1.5 parts leveling agent + 1.5 parts dispersant); Wrinkled surface layer slurry: 18 parts low viscosity resin + 12 parts high viscosity resin + 2 parts nano TiO2 + 1.5 parts boron nitride (accounting for 5% of the total resin) + 3 parts polyethersulfone + 3 parts alumina + auxiliary agent group (56 parts deionized water + 1.5 parts leveling agent + 1.5 parts dispersant). Step 3: Gradient coating and sintering: The first stage is the smooth base layer forming, which includes substrate pretreatment (aluminum alloy sandblasting (Sa2.5 grade)), spraying (wet film thickness 0.1mm), and sintering (280℃~320℃, 10~15 minutes, to form a dense layer with porosity <5%).

[0024] The second stage is the formation of the wrinkled surface layer, which includes spraying a wrinkled slurry (wet film thickness 0.22mm) onto the smooth layer and sintering (280℃~320℃, 15~20 minutes, to form a micro-wrinkled structure with a porosity of 15-20%).

[0025] In the above-mentioned method for preparing a high-temperature resistant, wear-resistant, and non-stick polyether ketone ketone coating, the thickness of the second coating layer is greater than the thickness of the first coating layer, and the ratio of the thickness of the second coating layer to the thickness of the first layer is (3:2).

[0026] Example 1: Basic Formulation Coating 1. Coating formulation (by weight parts): Undercoat formulation: Low viscosity titanium-modified PEKK resin (400 mesh, viscosity 450 mPa·s): 15 parts, fluorine-free viscous resin (polyethersulfone (PES)): 2 parts, alumina (3μm): 1 part, KH-550 modified nano titanium dioxide (30nm): 1 part, nano cerium dioxide (50nm): 0.2 parts, boron nitride (3μm): 0.8 parts, deionized water: 30 parts, ethanol: 2 parts, AFCONA-3580 leveling agent: 1 part, AFCONA-5071 dispersant: 1 part.

[0027] Topcoat formulation: Low viscosity titanium-modified PEKK resin: 10 parts, High viscosity titanium-modified PEKK resin (viscosity 2200 mPa·s): 8 parts, Fluorine-free viscous resin (polyethersulfone (PES)): 1.5 parts, Boron nitride (3μm): 1.2 parts (5% of total resin), KH-550 modified nano titanium dioxide (30nm): 1.5 parts, Nano cerium dioxide (50nm): 0.3 parts, Deionized water: 35 parts, Ethanol: 2.5 parts, AFCONA-3580 leveling agent: 1.2 parts, AFCONA-5071 dispersant: 1.2 parts.

[0028] 2. Preparation method ( Figure 2 ): The components were mixed in proportion and prepared into a uniform slurry using a high-speed disperser (1200 rpm, 30 min). The solid content of the bottom layer slurry was 35%, and the solid content of the top layer slurry was 38%. A smooth bottom layer (wet film thickness 0.08 mm) was sprayed onto a sandblasted aluminum substrate (Sa2.5); a dense bottom layer was formed by sintering at 320℃ for 12 min, and a wrinkled top layer (wet film thickness 0.18 mm) was sprayed and sintered at 320℃ for 18 min to form a micro-wrinkled top layer.

[0029] Example 2: Optimized Coating Formulation 1. Coating formulation (by weight parts): Undercoat formulation: Low viscosity titanium-modified PEKK resin: 18 parts, fluorine-free viscous resin (polyethersulfone (PES)): 2 parts, alumina (3μm): 2 parts, KH-550 modified nano titanium dioxide (30nm): 1.5 parts, nano cerium dioxide (50nm): 0.3 parts, deionized water: 32 parts, ethylene glycol: 2.5 parts, AFCONA-3590 leveling agent: 1.5 parts, AFCONA-5071 dispersant: 1.0 part.

[0030] Topcoat formulation: Low viscosity titanium-modified PEKK resin: 12 parts, High viscosity titanium-modified PEKK resin: 10 parts, Fluorine-free viscous resin (polyethersulfone (PES)): 1.5 parts, Boron nitride (3μm): 1.8 parts (5% of total resin), KH-550 modified nano titanium dioxide (30nm): 2.5 parts, Nano cerium dioxide (50nm): 0.4 parts, Diamond micro powder (1200 mesh): 1 part, Deionized water: 38 parts, Ethylene glycol: 3 parts, AFCONA-3590 leveling agent: 2 parts, AFCONA-5071 dispersant: 1.5 parts.

[0031] 2. Preparation method: The components were mixed in proportion and prepared into a uniform slurry using a high-speed disperser (1200 rpm, 30 min). The solid content of the bottom layer slurry was 38%, and the solid content of the top layer slurry was 42%. The synthesis of titanium-modified PEKK resin strictly followed the correct process route using diphenyl ether, terephthaloyl chloride, and isophthaloyl chloride as monomers. A smooth bottom layer (wet film thickness 0.08 mm) was sprayed onto a sandblasted aluminum substrate (Sa2.5); a dense bottom layer was formed by sintering at 320℃ for 10 min; a wrinkled top layer (wet film thickness 0.18 mm) was then sprayed and sintered at 320℃ for 20 min to form a micro-wrinkled top layer.

[0032] Example 3: Preferred Coating Formulation 1. Coating formulation (by weight parts): Undercoat formulation: Low viscosity titanium-modified PEKK resin: 20 parts, fluorine-free viscous resin (polyethersulfone (PES)): 3 parts, alumina (3μm): 3 parts, KH-550 modified nano titanium dioxide (30nm): 2 parts, nano cerium dioxide (50nm): 0.4 parts, boron nitride (3μm): 2 parts, deionized water: 35 parts, propylene glycol: 3 parts, AFCONA-3593 leveling agent: 2 parts, AFCONA-5010 dispersant: 1.5 parts.

[0033] Topcoat formulation: Low viscosity titanium-modified PEKK resin: 18 parts, High viscosity titanium-modified PEKK resin: 12 parts, Fluorine-free viscous resin (polyethersulfone (PES)): 2.5 parts, Boron nitride (3μm): 2.3 parts (accounting for 5.0% of the total topcoat resin), KH-550 modified nano titanium dioxide (30nm): 3 parts, Nano cerium dioxide (50nm): 0.8 parts, Diamond micro powder (1200 mesh): 2 parts, Deionized water: 40 parts, Propylene glycol: 3.5 parts, AFCONA-3593 leveling agent: 2.5 parts, AFCONA-5010 dispersant: 2 parts.

[0034] 2. Preparation method: The components were mixed in proportion and prepared into a uniform slurry using a high-speed disperser (1200 rpm, 30 min). The solid content of the bottom layer slurry was 40%, and the solid content of the top layer slurry was 45%. The synthesis of titanium-modified PEKK resin strictly followed the correct process route using diphenyl ether, terephthaloyl chloride, and isophthaloyl chloride as monomers. A smooth bottom layer (wet film thickness 0.08 mm) was sprayed onto a sandblasted aluminum substrate (Sa2.5); a dense bottom layer was formed by sintering at 320℃ for 15 min; a wrinkled top layer (wet film thickness 0.18 mm) was then sprayed and sintered at 320℃ for 20 min to form a micro-wrinkled top layer.

[0035] The specific embodiments of the invention have been described above. It should be understood that the invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood to be implemented in a manner common to the art; those skilled in the art can make various modifications or alterations within the scope of the claims, and make several simple deductions, variations or substitutions, which do not affect the substantive content of the invention.

Claims

1. A high-temperature resistant, wear-resistant, non-stick polyether ketone ketone coating, characterized in that, The composition comprises the following components as a percentage of the total mass of the composition: High-performance polyether ketone ketone resin group A: 13-30 parts, including 12-25 parts of titanium-modified polyether ketone ketone resin, 1-5 parts of fluorine-free adhesive resin and 0.65-6 parts of alumina; Group B of nano-scale inorganic materials: 0.5-3 parts, including 0.5-3 parts of nano-scale titanium dioxide, 0.025-0.6 parts of nano-scale cerium dioxide and 0.5-3 parts of boron nitride; Additives Group C: 62-71 parts, including 55-60 parts of deionized water, 2-4 parts by weight of cosolvent, 1-2 parts by weight of leveling agent, 1-2 parts by weight of dispersant, 1-2 parts by weight of defoamer, 1-2 parts by weight of surfactant and 0-1 parts by weight of filler.

2. The polyetherketoneketone high-temperature resistant, wear-resistant, non-stick coating according to claim 1, characterized in that, The alumina accounts for 5% to 20% of the total mass of the resin matrix group A, and the cerium dioxide accounts for 5% to 20% of the total mass of the nano-reinforcing group B; the nano-sized titanium dioxide has a particle size of 10 nm to 50 nm and its surface is modified by silane coupling agent KH-550; the boron nitride has a particle size of 1 to 5 μm.

3. The polyetherketoneketone high-temperature resistant, wear-resistant, and non-stick coating according to claim 1, characterized in that, The co-solvent is at least one of ethanol, butanol, ethylene glycol, and propylene glycol.

4. The polyetherketoneketone high-temperature resistant, wear-resistant, and non-stick coating according to claim 1, characterized in that, The leveling agent is an AFCONA series leveling agent, specifically one or more of AFCONA-3580, AFCONA-3581, AFCONA-3590, and AFCONA-3593; the dispersant is an AFCONA series dispersant, specifically one or more of AFCONA-5008, AFCONA-5009, AFCONA-5010, AFCONA-5044, and AFCONA5071; the defoamer is an AFCONA series defoamer, specifically one or more of AFCONA-2507, AFCONA-2508, AFCONA-2025, AFCONA-2524, AFCONA-2530, and AFCONA-2590; and the surfactant is one or more of sodium dodecyl sulfate, sodium alkylnaphthalene sulfonate, lauryl sulfate, polyethylene glycol alkyl ether, and polyethylene glycol alkyl aryl ether.

5. The high-temperature resistant, wear-resistant, and non-stick polyether ketone ketone coating according to claim 1, characterized in that, The filler is at least one of 500-800 mesh food-grade carbon black, mica pearl powder, and 1000-1500 mesh diamond powder.

6. The polyetherketoneketone high-temperature resistant, wear-resistant, and non-stick coating according to claim 1, characterized in that, The titanium-modified polyether ketone resin is synthesized by condensation polymerization of diphenyl ether, terephthaloyl chloride, and isophthaloyl chloride, with a particle size of 250 mesh to 400 mesh; the fluorine-free adhesive resin is selected from one or more of polyurethane silicone resin, polyimide silicone resin, and polyethersulfone.

7. The method for preparing the high-temperature resistant, wear-resistant, and non-stick polyether ketone ketone coating according to any one of claims 1 to 6, characterized in that, Includes the following steps: (1) Synthesis of polyetherketone resin: In a nitrogen-protected reactor, 40–60 kg of diphenyl sulfone solvent, 20.0–40.0 kg of diphenyl ether monomer, and 1.1–2.4 kg of tetraisopropyl titanate catalyst were added, and the esterification reaction was carried out at 65–75 °C for 0.5–1.0 h. Add 20.0–40.0 kg of terephthaloyl chloride and 20.0–40.0 kg of isophthaloyl chloride, and 4.0–8.0 kg of xylene solvent. Heat to 120–150 °C and react for 0.5–1.0 h. Then heat to 250–320 °C and polymerize for 1.0–3.0 h. Segmented reaction according to target viscosity: Low viscosity resin: The reaction is terminated after polymerization for 1.5 to 2.0 hours, and the viscosity is ≤500 mPa·s (25℃). High viscosity resin: The reaction is terminated after polymerization for 3.0 to 4.0 hours, and the viscosity is ≥2000 mPa·s (25℃). The reactants were neutralized with hydrochloric acid, washed with alcohol, and washed with water 6 to 8 times before drying to obtain titanium-modified polyether ketone resin powder. (2) Preparation of water-dispersible slurry: Smoothing layer slurry: Mix low-viscosity resin, fluorine-free viscous resin, alumina, and additives according to the proportions in claim 1, and add deionized water to adjust the solid content to 25%–40%; Wrinkled layer slurry: Mix low-viscosity resin and high-viscosity resin at a mass ratio of 3:2, add nano-reinforcing group, boron nitride, and auxiliary agent group, and add deionized water to adjust to a solid content of 25% to 40%; (3) Layered spraying and sintering: Spray a smooth layer of slurry (wet film thickness 0.05-0.1 mm) onto the substrate surface and sinter at 280-320℃ for 10-15 min; Spray a wrinkled layer slurry (wet film thickness 0.15-0.22 mm, 1.1-1.3 times that of the smooth layer) onto the smooth layer, and sinter at 280-320℃ for 15-20 min; The total coating thickness is 0.08 to 1.5 mm.

8. The preparation method according to claim 7, characterized in that: The viscosity-fractionated reaction described in step (1) is controlled by a chain terminator: Add 0.1–0.3 kg of benzoyl chloride to cap the low-viscosity resin after it has reacted for 1.5–2.0 h. Add 0.1-0.3 kg of isophthaloyl chloride to extend the chain when the high viscosity resin has been reacting for 3.0-4.0 h.

9. The preparation method according to claim 7, characterized in that: In step (2), boron nitride is added to the pleated slurry: the boron nitride accounts for 4.5% to 5.5% of the total solid content of the pleated slurry; the particle size is 1 to 5 μm, and it is dispersed synchronously with the resin matrix.

10. The preparation method according to claim 7, characterized in that: After sintering, the smooth layer forms a dense bottom layer with a porosity of ≤5%; after sintering, the wrinkled layer forms a micro-wrinkled surface structure with a porosity of 15% to 20%; the surface contact angle of the wrinkled layer is ≥100°, and it has high temperature resistance and non-stick properties.

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