Anti-adhesion conductive ceramic coating and application thereof on high-frequency electrotome

Abstract

The invention discloses an anti-adhesion conductive ceramic coating and application thereof to a high-frequency electrotome, and relates to the technical field of surface modification. The preparation method of the anti-adhesion conductive ceramic coating at least comprises the following preparation steps: carrying out cleaning and surface sand blasting treatment on a high-frequency electrotome substrate; blending fusible polytetrafluoroethylene powder, hydrophobic nano silicon dioxide particles and modified fluorinated graphene at a high speed to obtain mixed powder; and the mixed powder is sprayed on the surface of the high-frequency electrotome base body subjected to surface sand blasting through a powder electrostatic spraying technology, and after baking and cooling, the anti-adhesion conductive ceramic coating is obtained. The high-frequency electrotome anti-sticking ceramic coating prepared by the invention has good anti-sticking property, tissue adhesion resistance, electrical conductivity and low possibility of falling off.

Description

Technical Field

[0001] The present invention relates to the technical field of surface modification, and particularly relates to an anti-adhesion conductive ceramic coating and its application on a high-frequency electrotome. Background Art

[0002] While modern medicine treats patients' diseases, it pays more attention to the improvement and rehabilitation of patients' psychology, physiological pain, and quality of life, showing the greatest consideration for patients and reducing their pain. Compared with traditional surgeries, minimally invasive surgeries have the advantages of reducing pain, minimizing the trauma area, and accelerating postoperative recovery, greatly reducing the inconvenience and pain brought to patients by diseases. The invention of electrosurgical instruments has laid a solid foundation for the realization of minimally invasive surgeries, achieving the synchronization of tissue cutting and hemostasis, effectively reducing the blood loss of patients, lowering the surgical cost and postoperative risks, and improving the surgical efficiency and success rate. The invention and application of high-frequency electrotomes have contributed significantly. A high-frequency electrotome uses high-frequency high-voltage current flowing through human tissues to cause the charged particles in cells to oscillate violently and rub against each other, generating a large amount of heat, inducing cell bursting and vaporization, and tissue protein denaturation and coagulation to achieve the purpose of cutting and hemostasis. However, when a high-frequency electrotome is used for a long time, the operating temperature of the electrotome is relatively high, and the blood and soft tissues attached to the surface are prone to dehydration and crusting, resulting in the adhesion of blood and tissues to the surface, forming a charred crust, thereby reducing the conductivity and thermal conductivity, and affecting the vision and surgical effect.

[0003] Currently, the anti-adhesion measures on the surface of high-frequency electrotomes can be mainly divided into the following three types: changing the electrotome structure, changing the microscopic structure of the electrotome surface, and covering a coating on the electrotome surface. Among them, the method of covering a coating on the electrotome surface does not require changing the original shape of the electrotome, has a lower processing difficulty, and is more feasible in large-scale preparation. Ceramic coatings belong to functional coatings and are a new type of water-based inorganic coatings. It is a ceramic sol mainly composed of nano-inorganic compounds dispersed in an aqueous medium. After coating, it is usually cured by heating to form a coating similar to the properties of ceramics, which has the advantages of high mechanical strength, good wear resistance, corrosion resistance, good thermal stability, etc., and also has a high anti-adhesion performance and can be used on the surface of high-frequency electrotomes. However, most of the existing ceramic non-stick coatings are obtained by air pressure spraying, electrostatic spraying and then high-temperature sintering and curing. The obtained coatings have low adhesion, high brittleness, and average anti-tissue adhesion performance. Inevitably, they will be scratched, worn, and corroded during use, resulting in coating peeling and failure. Moreover, ceramic coatings are usually insulating coatings, which greatly limits the coating life and its application on high-frequency electrotomes. Therefore, it is crucial to prepare a coating with high film-substrate bonding strength, strong impact resistance, conductivity, and strong anti-adhesion force on the surface of high-frequency electrotomes. Summary of the Invention

[0004] The purpose of the present invention is to provide an anti-adhesion ceramic coating for high-frequency electrotomes and its preparation method, and solve the following technical problems: The existing anti-sticking ceramic coating is applied on the surface of the high-frequency electrotome substrate, having problems of high brittleness, insufficient anti-adhesion force and poor electrical conductivity.

[0005] The object of the present invention can be achieved by the following technical solutions: An anti-adhesive conductive ceramic coating, at least including the following preparation steps: Clean and perform surface sandblasting on the high-frequency electrotome substrate; High-speed blend the fusible polytetrafluoroethylene powder, hydrophobic nano-silica particles and modified fluorinated graphene to obtain a mixed powder; Spray the mixed powder on the surface of the high-frequency electrotome substrate after the surface sandblasting treatment by the powder electrostatic spraying process. After baking and cooling, an anti-adhesive conductive ceramic coating is obtained.

[0006] As a further solution of the present invention: the mass ratio of the fusible polytetrafluoroethylene, the hydrophobic nano-silica particles and the modified fluorinated graphene is 40-55:40-55:4-6.

[0007] As a further solution of the present invention: the parameters of the powder electrostatic spraying process are: the electrostatic high voltage is 40 kV, the spraying distance is 15-20 cm, and the carrier gas pressure is 0.3-0.4 MPa.

[0008] As a further solution of the present invention: the preparation method of the hydrophobic nano-silica particles includes the following steps: Mix anhydrous ethanol and ammonia water evenly, and then dropwise add tetraethyl orthosilicate to obtain a mixed solution; Add polytri(fluoropropyl)methylsiloxane to the mixed solution, stir, centrifuge, wash and dry to obtain hydrophobic nano-silica particles.

[0009] As a further solution of the present invention: the mass ratio of the tetraethyl orthosilicate, the ammonia water, the anhydrous ethanol and the polytri(fluoropropyl)methylsiloxane is 1-2:4-5:5:0.2-0.5, and the mass fraction of the ammonia water is 25-28%.

[0010] As a further solution of the present invention: the preparation method of the modified fluorinated graphene includes the following steps: Oxidize fluorinated graphite with concentrated sulfuric acid, potassium permanganate and hydrogen peroxide to obtain oxygenated fluorinated graphite powder; Disperse the oxygenated fluorinated graphite in N-methylpyrrolidone, heat intercalate at 50-60 °C for 2-4 h, then ultrasonically exfoliate for 15-16 h, centrifuge, wash and dry to obtain oxygenated fluorinated graphene; Disperse the graphene oxyfluoride in an ethanol-aqueous solution, add KH550 and N,N'-dicyclohexylcarbodiimide, react at 70-80 °C for 10-12 h, centrifuge, wash and dry to obtain modified fluorinated graphene.

[0011] As a further aspect of the present invention: the mass ratio of the graphene oxyfluoride, the KH550 and the N,N'-dicyclohexylcarbodiimide is 1:50-60:0.05-0.1.

[0012] As a further aspect of the present invention: the parameters of the surface sandblasting treatment are: the air pressure is 0.5-1 MPa, the sandblasting time is 30-120 s, the sandblasting material is quartz sand with a particle size of 80-100 mesh, and the sandblasting distance is 100-300 mm.

[0013] As a further aspect of the present invention: the material of the high-frequency electrotome is stainless steel, titanium alloy, tungsten alloy or cemented carbide.

[0014] An application of the anti-adhesive ceramic coating of the high-frequency electrotome described in any one of the above in a high-frequency electrotome.

[0015] The beneficial effects of the present invention: The present invention uses soluble polytetrafluoroethylene powder, hydrophobic nano-silica particles and modified fluorinated graphene to form an anti-adhesive conductive ceramic coating on the surface of the high-frequency electrotome, and the obtained high-frequency electrotome can be used at 40-70 °C. The soluble polytetrafluoroethylene powder and the hydrophobic nano-silica particles endow the anti-adhesive ceramic coating with excellent anti-blood adhesion and anti-tissue adhesion properties, and the addition of the modified fluorinated graphene makes the surface have good electrical conductivity, which can be applied to the surface of medical electrosurgical instruments that require discharge during use. The anti-adhesive ceramic coating obtained by the method of the present invention has good anti-blood adhesion and anti-tissue adhesion, improves the defects of the pure ceramic coating such as large brittleness and easy peeling, and can reduce problems such as tissue adhesion and eschar formation generated during the use of medical high-frequency electrotomes, and has a relatively broad application prospect in the medical field.

[0016] In the present invention, a coating is prepared by compounding soluble polytetrafluoroethylene powder and hydrophobic nano-silica particles. The soluble polytetrafluoroethylene powder is uniformly distributed on the surface of the particles as a binder, binding the hydrophobic nano-silica particles together. Moreover, the coating of the soluble polytetrafluoroethylene powder on the particle surface can further reduce the surface free energy of the coating, which can not only effectively improve the hardness and wear resistance of the soluble polytetrafluoroethylene coating used alone, but also improve the problem of the brittle and hard texture of the ceramic coating, making the prepared coating have excellent impact toughness, hardness, wear resistance, high temperature resistance, scratch resistance and excellent non-stick property. In addition, for the hydrophobic nano-silica particles prepared in the present invention, the silica nanoparticles are hydrophobically modified by polytrifluoropropylmethylsiloxane, so that the obtained coating has good hydrophobicity, good scratch resistance, good corrosion resistance and high coating adhesion, greatly extending the service life of the coating.

[0017] The present invention also uses fluorinated graphite as a raw material to prepare graphene oxyfluoride by an improved Hummers method to obtain some oxygen-containing functional groups for subsequent surface chemical modification. Then, 3-aminopropyltriethoxysilane (KH550) is used to carry out surface graft modification on the graphene oxyfluoride to prepare modified fluorinated graphene, and the modified fluorinated graphene is blended with soluble polytetrafluoroethylene powder and hydrophobic nano-silica particles to obtain a coating. On the one hand, the addition of the modified fluorinated graphene makes the obtained coating have good conductivity. On the other hand, the modification of the graphene oxyfluoride by KH550 improves its compatibility and dispersibility, which is beneficial to the further improvement of the coating performance. Before preparing the coating, the substrate is sandblasted in the present invention. At the same time, the oxygen-containing functional groups in the added modified fluorinated graphene can have a certain interaction with the substrate, increasing the bonding force to a certain extent and enhancing the coating-substrate bonding strength, so that the anti-stick ceramic coating prepared in the present invention is not easy to fall off, improving the service life of the coating. The high-frequency electrosurgical unit substrate includes all common materials such as stainless steel, titanium alloy, tungsten alloy or cemented carbide. The preparation method of the present invention is applicable to various alloy substrates and can have good bonding force and anti-stick performance. Detailed implementation mode

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Example 1 The preparation method of the hydrophobic nano-silica particles includes the following steps: Add 5 parts by mass of absolute ethanol and 5 parts by mass of 25% ammonia water into a conical flask, use a magnetic stirrer to mix them evenly, then slowly drop 2 parts by mass of tetraethyl orthosilicate, and continuously stir in a 50 °C constant temperature water bath for 2 - 3 h to obtain a mixed solution; Add 0.5 part by mass of polytetrafluoropropylmethylsiloxane into the above-prepared mixed solution, continue to stir in a 50 °C constant temperature water bath for 4 h, centrifuge and wash with absolute ethanol, and then dry in an oven at 80 °C for 24 h to obtain hydrophobic nano-silica particles.

[0020] Example 2 The preparation method of modified fluorinated graphene includes the following steps: Add 2 g of fluorinated graphite, 1 g of K 2 S 2 O 8 and 1 g of P 2 O 5 into a beaker containing 20 mL of concentrated sulfuric acid in sequence. After stirring evenly, place the reaction system in an 80 °C water bath and continuously stir for 5 - 6 h. After cooling to room temperature, add 200 mL of ionic water, filter and wash repeatedly, and then dry in an 80 °C vacuum drying oven for 24 h to obtain a pre-oxidized product; Add the above pre-oxidized product and 1 g of NaNO 3 into a flask containing 46 mL of concentrated sulfuric acid in sequence. Continuously stir in an ice-water bath until evenly dispersed, then slowly add 8 g of KMnO 4 , react at 0 - 4 °C for 30 min, then raise the temperature to 35 °C and maintain for 30 min. Then, while stirring, dropwise add 100 mL of deionized water, transfer the solution to a 95 °C water bath, continuously stir and react for 30 min, add another 100 mL of deionized water. After cooling to room temperature, add 10 mL of hydrogen peroxide, let it stand for 12 h, then centrifuge and wash, and freeze-dry to obtain oxygen-fluorinated graphite; Disperse 0.5 g of the above-prepared oxygen-fluorinated graphite in 300 mL of N-methylpyrrolidone reagent to form a dispersion. Heat-intercalate the dispersion in a 60 °C water bath for 2 h. After the reaction, transfer the system to an ultrasonic cleaner and continuously ultrasonically exfoliate at 40 W for 15 h. After the ultrasonic treatment, centrifuge and separate, and wash repeatedly with absolute ethanol and deionized water, and then freeze-dry to obtain oxygen-fluorinated graphene; Disperse the above-prepared oxygen-fluorinated graphene in 300 mL of 90 wt% ethanol-aqueous solution, obtain a uniform dispersion after continuous ultrasonic treatment. Add 30 mL of KH550 and 0.04 g of N,N'-dicyclohexylcarbodiimide powder to the dispersion, mix evenly and transfer to a 70 °C water bath and continuously stir and react for 12 h. After centrifuging and washing, dry in a 60 °C vacuum drying oven for 12 h to obtain modified fluorinated graphene.

[0021] Example 3 The preparation method of modified fluorinated graphene includes the following steps: Put 2 g of fluorinated graphite, 1 g of K 2 S 2 O 8 and 1 g of P 2 O 5 into a beaker containing 20 mL of concentrated sulfuric acid in sequence. After stirring evenly, place the reaction system in an 80 °C water bath and continuously stir for 5 - 6 h. After cooling to room temperature, add 200 mL of ionized water. After filtering and washing multiple times, place it in an 80 °C vacuum drying oven and dry for 24 h to obtain a pre-oxidized product; Put the above-mentioned pre-oxidized product and 2 g of NaNO 3 into a flask containing 46 mL of concentrated sulfuric acid in sequence. Continuously stir in an ice-water bath until evenly dispersed, then slowly add 10 g of KMnO 4 , react at 0 - 4 °C for 30 min, then raise the temperature to 35 °C and maintain for 30 min. Then, while stirring, dropwise add 100 mL of deionized water. Then transfer the solution to a 95 °C water bath and continuously stir and react for 30 min. Add another 100 mL of deionized water. After cooling to room temperature, add 10 mL of hydrogen peroxide. After standing for 12 h, centrifuge and wash, and then freeze-dry to obtain oxygen-fluorinated graphite; Disperse 0.5 g of the above-prepared oxygen-fluorinated graphite in 300 mL of N-methylpyrrolidone reagent to form a dispersion. Heat-intercalate the dispersion in a 60 °C water bath for 2 h. After the reaction ends, transfer the system to an ultrasonic cleaner and continuously ultrasonically exfoliate for 15 h under the condition of 40 W. After the ultrasonic treatment ends, centrifuge and separate, and wash multiple times with anhydrous ethanol and deionized water. Then freeze-dry to obtain oxygen-fluorinated graphene; Disperse the above-prepared oxygen-fluorinated graphene in 300 mL of 90 wt% ethanol-aqueous solution. After continuous ultrasonic treatment, a uniform dispersion is obtained. Add 30 mL of KH550 and 0.05 g of N,N'-dicyclohexylcarbodiimide powder to the dispersion. After mixing evenly, transfer it to a 70 °C water bath and continuously stir and react for 12 h. After centrifuging and washing, place it in a 60 °C vacuum drying oven and dry for 12 h to obtain modified fluorinated graphene.

[0022] Example 4 The preparation method of the anti-adhesion conductive ceramic coating includes the following steps: Degrease the high-frequency electrotome substrate at 55 °C for 8 minutes, wash it with deionized water and ethanol, and dry it at 100 °C for 5 min. Use quartz sand with a mesh size of 80 - 100, at a distance of 200 mm from the substrate surface, and sandblast for 60 s under the air jet pressure of 0.8 MPa. Then use air flow to blow the residual powder particles on the surface of the pot body substrate clean; Mix 40 parts by mass of fusible polytetrafluoroethylene powder, 55 parts by mass of the hydrophobic nano-silica particles prepared in Example 1, and 5 parts by mass of the modified fluorinated graphene prepared in Example 2 at high speed for 3 min to obtain a mixed powder; Spray the above mixed powder on the surface of the high-frequency electrotome substrate after surface sandblasting treatment by the powder electrostatic spraying process, wherein the electrostatic high voltage is 40 kV, the spraying distance is 20 cm, the carrier gas pressure is 0.4 MPa, and after spraying, heat it to 360 °C at a rate of 6 °C / min and bake for 40 min. After baking, cool it to room temperature with the furnace to obtain an anti-adhesion conductive ceramic coating.

[0023] Example 5 The preparation method of the anti-adhesion conductive ceramic coating includes the following steps: Degrease the high-frequency electrotome substrate at 55 °C for 8 minutes, wash it with deionized water and ethanol, and dry it at 100 °C for 5 min. Use quartz sand with a mesh size of 80-100, 200 mm away from the substrate surface, and sandblast for 60 s under the jet air flow pressure of 0.8 MPa, and then blow the residual powder particles on the surface of the pot body substrate clean with air flow; Mix 40 parts by mass of fusible polytetrafluoroethylene powder, 55 parts by mass of the hydrophobic nano-silica particles prepared in Example 1, and 5 parts by mass of the modified fluorinated graphene prepared in Example 3 at high speed for 3 min to obtain a mixed powder; Spray the above mixed powder on the surface of the high-frequency electrotome substrate after surface sandblasting treatment by the powder electrostatic spraying process, wherein the electrostatic high voltage is 40 kV, the spraying distance is 20 cm, the carrier gas pressure is 0.4 MPa, and after spraying, heat it to 360 °C at a rate of 6 °C / min and bake for 40 min. After baking, cool it to room temperature with the furnace to obtain an anti-adhesion conductive ceramic coating.

[0024] Example 6 The preparation method of the anti-adhesion conductive ceramic coating includes the following steps: Degrease the high-frequency electrotome substrate at 55 °C for 8 minutes, wash it with deionized water and ethanol, and dry it at 100 °C for 5 min. Use quartz sand with a mesh size of 80-100, 200 mm away from the substrate surface, and sandblast for 60 s under the jet air flow pressure of 0.8 MPa, and then blow the residual powder particles on the surface of the pot body substrate clean with air flow; Mix 45 parts by mass of fusible polytetrafluoroethylene powder, 50 parts by mass of the hydrophobic nano-silica particles prepared in Example 1, and 5 parts by mass of the modified fluorinated graphene prepared in Example 2 at high speed for 3 min to obtain a mixed powder; The above-mentioned mixed powder is sprayed on the surface of the high-frequency electrotome substrate after surface sandblasting treatment by powder electrostatic spraying process. Among them, the electrostatic high voltage is 40 kV, the spraying distance is 20 cm, the carrier gas pressure is 0.4 MPa. After spraying, it is heated to 360 °C at a rate of 6 °C / min and baked for 40 min. After the baking is completed, it is cooled to room temperature with the furnace to obtain an anti-adhesion conductive ceramic coating.

[0025] Example 7 The preparation method of the anti-adhesion conductive ceramic coating includes the following steps: Degrease the high-frequency electrotome substrate at 55 °C for 8 minutes, wash it with deionized water and ethanol, and dry it at 100 °C for 5 min. Use quartz sand with a mesh size of 80-100, at a distance of 200 mm from the substrate surface, and sandblast for 60 s under the jet air pressure of 0.8 MPa, and then blow the residual powder particles on the surface of the pot body substrate clean with air flow; High-speed blend 45 parts by mass of fusible polytetrafluoroethylene powder, 50 parts by mass of the hydrophobic nano-silica particles prepared in Example 1 and 5 parts by mass of the modified fluorinated graphene prepared in Example 3 for 3 min to obtain a mixed powder; The above-mentioned mixed powder is sprayed on the surface of the high-frequency electrotome substrate after surface sandblasting treatment by powder electrostatic spraying process. Among them, the electrostatic high voltage is 40 kV, the spraying distance is 20 cm, the carrier gas pressure is 0.4 MPa. After spraying, it is heated to 360 °C at a rate of 6 °C / min and baked for 40 min. After the baking is completed, it is cooled to room temperature with the furnace to obtain an anti-adhesion conductive ceramic coating.

[0026] Comparative Example 1 Omit the preparation step of modified fluorinated graphene. Compared with Example 4, in Comparative Example 1, the modified fluorinated graphene prepared in Example 2 is not added, and the other components and preparation methods are exactly the same as those in Example 4.

[0027] Comparative Example 2 The preparation method of nano-silica powder includes the following steps: Add 2 parts by mass of tetraethyl orthosilicate to 5 parts by mass of absolute ethanol to prepare a tetraethyl orthosilicate solution. Add 5 parts by mass of ammonia water with a mass fraction of 25% to the above tetraethyl orthosilicate solution, stir and react in a 50 °C constant temperature water bath for 4 h. After cooling to room temperature, wash and centrifuge with absolute ethanol, and then vacuum dry at 80 °C to obtain nano-silica particles In the preparation steps of the anti-adhesion conductive ceramic coating, compared with Example 4, in Comparative Example 2, the hydrophobic modified silica powder prepared in Example 1 added in Example 4 is replaced with the unmodified nano-silica particles prepared in this comparative example in equal mass, and the other components and preparation methods are exactly the same as those in Example 4.

[0028] Comparative Example 3: The preparation step of the modified fluorinated graphene was omitted. On the surface of the high-frequency electrotome substrate after surface sandblasting treatment in Example 4, the hydrophobic nano-silica particles prepared in Example 2 were sprayed to form an anti-adhesive ceramic layer.

[0029] Comparative Example 4: A common medical high-frequency electrotome of model Sj-1 produced by Shaoxing Shangyu Xinyue Medical Devices Co., Ltd. was selected.

[0030] Performance Detection Contact Angle: The static contact angle of the coating was measured using a DSA30 type contact angle measuring instrument produced by Krüss GmbH in Germany. The test results are shown in Table 1; Rolling Angle: At room temperature, the specimen was placed obliquely on a glass slide, and a 10 μL drop of water was statically dropped on it to observe whether the water droplet rolled on the specimen. If it rolled, this angle was recorded as the rolling angle of the specimen; if it did not roll, the number of glass slides was increased until the water droplet rolled on the specimen. If the specimen still did not roll at an angle of 90°, the rolling angle of this specimen was recorded as 90°. The test results are shown in Table 1; Conductive Performance: Two electric pens of a digital multimeter were respectively placed at the center of the electrotome handle and the center of the blade head to test the surface resistance value of the electrotome. The test results are shown in Table 1; Coating-Substrate Bonding Strength: According to G98642-88, the bonding force between the anti-adhesive conductive ceramic coating and the high-frequency electrotome substrate was measured. The test results are shown in Table 1; Anti-blood-adhesion Performance: The high-frequency electrotomes in Examples 4-7 and Comparative Examples 1-4 were immersed in fresh pig blood. The electrotome handle was connected to a high-frequency power supply, and the test was carried out at a power of 150 W. In each group of tests, the high-frequency electrotome was immersed in pig blood for 10 s, and the blood adhesion state was observed. The test results are shown in Table 1; Anti-tissue-adhesion Performance: The high-frequency electrotomes in Examples 4-7 and Comparative Examples 1-4 were used for electric cutting of fresh pork at a power of 150 W. During the test, the electrotome was used to cut the surface of the pork from left to right. Each cutting time was 5 s, and it was cut 3 times. The tissue adhesion state was observed. The test results are shown in Table 1.

[0031] Table 1: Statistical Table of Coating Performance Detection Data in Examples 4-7 and Comparative Examples 1-4

[0032] As can be seen from Table 1, the anti-adhesion conductive ceramic coating prepared by the present invention adheres to the surface of the substrate of the high-frequency electrotome. The obtained coating has good conductivity, high hydrophobicity, and strong bonding force with the substrate. The high-frequency electrotome has good anti-blood adhesion and anti-tissue adhesion properties. In Comparative Example 1, modified fluorinated graphene was not added, and the obtained ceramic coating was insulating. In Comparative Example 2, the nano-silica ions added were not hydrophobically modified, and the hydrophobicity of the obtained ceramic coating decreased, and the anti-sticking performance of the obtained high-frequency electrotome was poor. In Comparative Example 3, the prepared hydrophobic nano-silica particles were used to form a pure ceramic coating on the surface of the high-frequency electrotome substrate by spraying technology. The obtained anti-sticking ceramic coating of the high-frequency electrotome was brittle, had poor conductivity, and the anti-sticking performance and the bonding force with the substrate also decreased. In Comparative Example 4, it was a commercially available ordinary high-frequency electrotome, and all aspects of its performance were poor.

[0033] The above has described in detail an embodiment of the present invention, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. An anti-adhesion conductive ceramic coating, characterized in that: The method comprises at least the following preparation steps: Clean and sandblast the high-frequency electric knife base; The fusible polytetrafluoroethylene powder, the hydrophobic nano-silicon dioxide particles and the modified fluorinated graphene are blended at high speed to obtain a mixed powder; The mixed powder is sprayed on the surface of the high-frequency electric knife substrate after the surface sandblasting by a powder electrostatic spraying process, and after baking and cooling, an anti-adhesion conductive ceramic coating is obtained.

2. The anti-adhesion conductive ceramic coating according to claim 1, characterized in that: The mass ratio of the fusible polytetrafluoroethylene, the hydrophobic nano-silicon dioxide particles and the modified fluorinated graphene is 40-55:40-55:4-6.

3. The anti-adhesion conductive ceramic coating according to claim 1, characterized in that: The parameters of the powder electrostatic spraying process are: electrostatic high voltage is 40 kV, spraying distance is 15-20 cm, and carrier gas pressure is 0.3-0.4 MPa.

4. The anti-adhesion conductive ceramic coating according to claim 1, characterized in that: The preparation method of the hydrophobic nano-silicon dioxide particles comprises the following steps: After mixing anhydrous ethanol and ammonia water evenly, adding tetraethyl orthosilicate dropwise to obtain a mixed solution; Polytrifluoropropylmethylsiloxane is added into the mixed solution, and after stirring, centrifugation, washing and drying, hydrophobic nano-silica particles are obtained.

5. The anti-adhesion conductive ceramic coating according to claim 4, characterized in that: The mass ratio of the tetraethyl orthosilicate, the ammonia water, the anhydrous ethanol and the polytrifluoropropylmethylsiloxane is 1-2:4-5:5:0.2-0.5, and the mass fraction of the ammonia water is 25-28%.

6. The anti-adhesion conductive ceramic coating according to claim 1, characterized in that: The preparation method of the modified fluorinated graphene comprises the following steps: The fluorinated graphite is oxidized by concentrated sulfuric acid, potassium permanganate and hydrogen peroxide to obtain oxyfluorinated graphite powder; The oxyfluorinated graphite is dispersed in N-methylpyrrolidone, and after thermal intercalation at 50-60° C. for 2-4 hours, ultrasonically exfoliated for 15-16 hours, centrifuged, washed and dried to obtain oxyfluorinated graphene; The oxyfluorinated graphene is dispersed in an ethanol-water solution, KH550 and N,N'-dicyclohexylcarbodiimide are added, reacted at 70-80°C for 10-12h, centrifuged, washed and dried to obtain modified fluorinated graphene.

7. An anti-adhesion conductive ceramic coating according to claim 6, characterized in that The mass ratio of the graphene oxyfluoride, the KH550 and the N,N'-dicyclohexylcarbodiimide is 1:50-60:0.05-0.

1.

8. The anti-adhesion conductive ceramic coating according to claim 1, characterized in that: The parameters of the surface sandblasting treatment are: air pressure of 0.5-1MPa, sandblasting time of 30-120s, sandblasting material of quartz sand with a particle size of 80-100 mesh, and sandblasting distance of 100-300mm.

9. The anti-adhesion conductive ceramic coating according to claim 1, characterized in that: The material of the high-frequency electric knife is stainless steel, titanium alloy, tungsten alloy or hard alloy.

10. Use of the anti-stick ceramic coating of a high-frequency electric knife as claimed in any one of claims 1 to 9 in a high-frequency electric knife.

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