Conductive corrosion-resistant fluorine-containing material and preparation method thereof

Abstract

The invention discloses a conductive corrosion-resistant fluorine-containing material and a preparation method thereof. The conductive corrosion-resistant fluorine-containing material is prepared from the following components in percentage by mass: 10 to 30 percent of carbon fiber, 0 to 10 percent of graphite, 10 to 30 percent of polytetrafluoroethylene (PTFE), 10 to 30 percent of polytrifluorochloroethylene (PCTFE) and 10 to 30 percent of tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer (PFA). During preparation, the composite powder is uniformly mixed and then poured into a mold for hot press molding, the mold pressing temperature is 360-380 DEG C, the pressure is 5-15 MPa, and natural cooling and demolding are performed. The product has the advantages of high strength, low resistance, high corrosion resistance, wear resistance and the like, the preparation method is simple, and the product can be easily processed into high-temperature corrosion-resistant containers and other products needing low resistance and high corrosion resistance.

Description

Technical Field

[0001] The invention relates to the field of fluoroplastics, and in particular to a conductive, corrosion-resistant, fluorine-containing material and a preparation method thereof. Background Art

[0002] With the development of semiconductor equipment, chemical containers and other fields, the performance requirements for high temperature corrosion resistant containers are getting higher and higher, especially in terms of high temperature resistance, corrosion resistance, high strength, etc. Traditional metal and plastic materials are difficult to meet these requirements. Therefore, fluorine-containing composite materials, as special materials facing this working condition, have broad application prospects.

[0003] Polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE) and tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer (PFA) are three common fluorine-containing polymer materials with good chemical corrosion resistance, high temperature resistance and low friction coefficient. Polytetrafluoroethylene is a typical inert material with excellent chemical corrosion resistance. Compared with PTFE, polychlorotrifluoroethylene has better processability and mechanical strength and can be used in more complex environments. Tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer shows greater advantages in processability and can obtain more complex structures through melt molding.

[0004] In order to improve the performance of fluorine-containing composite materials in high-temperature corrosive solutions, long carbon fibers are introduced as modifiers, which can effectively improve the mechanical strength and high-temperature resistance of composite materials. Long carbon fibers have extremely high strength and can significantly enhance the overall mechanical properties of composite materials, especially when subjected to high pressure and temperature. In addition, long carbon fibers have good electrical conductivity, which helps to reduce the resistance of composite materials and improve their adaptability in environments such as static electricity.

[0005] In order to further reduce the resistance of the fluorine-containing composite material, graphite is introduced as a modifier, which can significantly improve the electrical conductivity and thermal conductivity of the composite material. Graphite has excellent electrical conductivity and a low thermal expansion coefficient, which can effectively reduce the thermal stress of the composite material in a high temperature environment and improve its adaptability in an electrostatic environment. In addition, the layered structure of graphite gives it good lubricity, which can further reduce the friction coefficient of the material and enhance the wear resistance of the composite material. Therefore, the addition of graphite not only improves the electrical properties of the composite material, but also improves its mechanical properties and high temperature resistance, and improves the overall performance of the material in high temperature corrosive solutions.

[0006] Although current composite materials have made certain progress in corrosion-resistant applications, they rely heavily on imports in the field of high-temperature corrosion resistance, and there are urgent problems to be solved in terms of mechanics, thermodynamics, corrosion resistance, and long life. First, the problem of material mechanical property degradation under long-term high temperature still exists, especially the composite materials have weak anti-aging ability in high temperature environments. Secondly, how to further improve the corrosion resistance of composite materials, especially when facing strong acid or strong alkali solutions, is still a technical difficulty. Therefore, the development of fluorine-containing composite materials with higher strength, corrosion resistance and high temperature resistance is still a key technical problem to be solved in the future. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a conductive, corrosion-resistant, fluorine-containing material and a preparation method thereof in view of the defects involved in the background technology.

[0008] The present invention adopts the following technical solutions to solve the above technical problems: A conductive, corrosion-resistant fluorine-containing material comprises the following components in percentage by mass: 10-30% carbon fiber, 0-10% graphite, 10-30% polytetrafluoroethylene, 10-30% polychlorotrifluoroethylene, and 10-30% tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer.

[0009] Preferably, the average particle size of the polytetrafluoroethylene is 75 μm. Polytetrafluoroethylene is selected because of its good self-lubricating properties and high temperature resistance and chemical corrosion resistance, which can significantly improve the adaptability of the composite material in high temperature corrosive solutions.

[0010] Preferably, the particle size of the polychlorotrifluoroethylene is 25-50 μm. Polychlorotrifluoroethylene is selected because it has high mechanical strength, good chemical stability and processing performance, and can enhance the molding ability of the material in complex-shaped workpieces.

[0011] Preferably, the particle size of the tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer is 30-60 μm. The tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer is selected because it has good processability and corrosion resistance, and can maintain good mechanical properties and structural stability, especially at high temperatures.

[0012] Preferably, the length of the carbon fiber used is 200 μm and the diameter is 5 to 10 μm. Carbon fiber is selected because of its high strength, high rigidity and excellent electrical conductivity, which can significantly improve the mechanical properties and electrical conductivity of the composite material while enhancing its ability to resist deformation under high pressure environments.

[0013] Preferably, the size of the graphite used is in the range of 1 to 10 μm and the thickness is 2 to 5 μm. Graphite is selected because of its excellent electrical conductivity and lubricity, which can further reduce the resistance of the composite material while enhancing its wear resistance and stability in a dynamic friction environment.

[0014] The present invention also provides a method for preparing the conductive, corrosion-resistant, fluorine-containing material, comprising the following steps: Step 1), 10-30% of polytetrafluoroethylene, 10-30% of polytrifluorochloroethylene, and 10-30% of tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer are mixed evenly by dry mixing process, and then 10-30% of carbon fiber and 0-10% of graphite are added, mixed evenly and dried to obtain a mixed mold material; Step 2), pour the mixed mold material into the mold for hot pressing and sintering, the molding temperature is 360-380°C, the pressure is 5-15MPa, and the mold is demolded by natural cooling to obtain a conductive, corrosion-resistant, fluorine-containing material.

[0015] The manufactured conductive corrosion-resistant fluorine-containing material can be used after being cut, polished and surface treated.

[0016] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects: 1. The present invention has excellent corrosion resistance, can effectively resist the corrosion of high-temperature corrosive solutions, greatly prolongs the service life of the material, and is particularly suitable for materials used for a long time in a strong acid environment; 2. Through the composite modification of carbon fiber and graphite, the present invention can significantly improve the mechanical strength and conductivity of the composite material, while reducing the resistance, ensuring that the material can still maintain stable electrical properties in high temperature and strong corrosive environments, and is suitable for application scenarios that require stable current and voltage transmission. The low resistance performance of the material helps to improve work efficiency and reduce energy consumption; 3. The high temperature resistance of the present invention is significantly better than that of traditional materials, and it can work stably under high temperature conditions, avoiding precipitation in high temperature corrosive solutions. Its excellent high temperature corrosion resistance makes the material reliable and stable for long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a histogram of the hardness of the composite material in each embodiment of the present invention; Figure 2 A histogram showing the wear rate of the composite material in each embodiment of the present invention; Figure 3 A histogram of the friction coefficient of the composite material in each embodiment of the present invention; Figure 4 The 4 mm surface resistance bar graph of the composite material in each embodiment of the present invention. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings: The present invention may be implemented in many different forms and should not be considered limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0019] The fluorine-containing composite material of the present invention is mainly used to manufacture high-temperature resistant and corrosion-resistant conductive materials. The average particle size of polytetrafluoroethylene selected in the following embodiments is 75 μm, purchased from Daikin Fluorine Chemical (China) Co., Ltd.; the average particle size of polytrifluorochloroethylene is 40 μm, purchased from Nanjing Runfang Engineering Plastics Co., Ltd.; the average particle size of tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer is 45 μm, purchased from Nanjing Runfang Engineering Plastics Co., Ltd.; the length of carbon fiber is 200 μm and the diameter is 5-10 μm, purchased from Nanjing Shirui Composite Materials Co., Ltd.; the size range of graphite is 1-10 μm, the thickness is about 2-5 μm, purchased from Shanghai Aladdin Biochemical Technology Co., Ltd. Example

[0020] The mass percentages of the components of the high temperature corrosion resistant fluorine-containing conductive composite material are as follows: 10% of polytetrafluoroethylene, 30% of polytrifluorochloroethylene, 30% of tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, 27% of carbon fiber, and 3% of graphite.

[0021] Specific preparation steps: 1. First, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, polytrifluorochloroethylene and polytetrafluoroethylene are mixed evenly at least three times by using a high-speed mechanical stirrer by dry mixing process, and then carbon fiber and graphite are added, mixed evenly and dried; 2. Pour the mixed mold material into the mold for hot pressing and sintering. The molding temperature is 360℃ and the pressure is 5MPa. Demolding is carried out after natural cooling. 3. Cut, grind and surface treat the fluorine-containing composite material prepared in step 2 for subsequent use.

[0022] The fluorine-containing composite material prepared in this example was directly contacted with a mixed solution of 98% H2SO4 and H2O2 in a ratio of 3:1 at 200°C to conduct a concentrated sulfuric acid corrosion test. No obvious color change was observed after the sample was placed for 24 hours.

[0023] The hardness, surface resistance, and friction and wear performance of the fluorine-containing material prepared in this embodiment were tested, and the Vickers hardness was 28.2 (0.1 HV), the 4 mm surface resistance was 733.26 Ω, the friction coefficient was 0.296, and the wear rate was 1.201×10 -5 mm 3 / N•m. Example

[0024] The mass percentages of the components of the high temperature corrosion resistant fluorine-containing conductive composite material are as follows: 13% of polytetrafluoroethylene, 27% of polytrifluorochloroethylene, 30% of tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, 27% of carbon fiber, and 3% of graphite.

[0025] Specific preparation steps: 1. First, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, polytrifluorochloroethylene and polytetrafluoroethylene are mixed evenly at least three times by using a high-speed mechanical stirrer by dry mixing process, and then carbon fiber and graphite are added, mixed evenly and dried; 2. Pour the mixed mold material into the mold for hot pressing and sintering. The molding temperature is 370℃ and the pressure is 10MPa. Demolding is carried out after natural cooling. 3. Cut, grind and surface treat the fluorine-containing composite material prepared in step 2 for subsequent use.

[0026] The fluorine-containing composite material prepared in this example was directly contacted with a mixed solution of 98% H2SO4 and H2O2 in a ratio of 3:1 at 200°C to conduct a concentrated sulfuric acid corrosion test. No obvious color change was observed after the sample was placed for 24 hours.

[0027] The hardness, surface resistance, and friction and wear performance of the fluorine-containing material prepared in this embodiment were tested, and the Vickers hardness was 26.8 (0.1 HV), the 4 mm surface resistance was 802.27 Ω, the friction coefficient was 0.279, and the wear rate was 1.126×10 -5 mm 3 / N•m. Example

[0028] The mass percentages of the components of the high temperature corrosion resistant fluorine-containing conductive composite material are as follows: 10% of polytetrafluoroethylene, 30% of polytrifluorochloroethylene, 30% of tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, 25% of carbon fiber, and 5% of graphite.

[0029] Specific preparation steps: 1. First, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, polytrifluorochloroethylene and polytetrafluoroethylene are mixed evenly at least three times by using a high-speed mechanical stirrer by dry mixing process, and then carbon fiber and graphite are added, mixed evenly and dried; 2. Pour the mixed mold material into the mold for hot pressing and sintering. The molding temperature is 380℃ and the pressure is 15MPa. Demolding is carried out after natural cooling. 3. Cut, grind and surface treat the fluorine-containing composite material prepared in step 2 for subsequent use.

[0030] The fluorine-containing composite material prepared in this example was directly contacted with a mixed solution of 98% H2SO4 and H2O2 in a ratio of 3:1 at 200°C to conduct a concentrated sulfuric acid corrosion test. No obvious color change was observed after the sample was placed for 24 hours.

[0031] The hardness, surface resistance, and friction and wear performance of the fluorine-containing material prepared in this embodiment were tested, and the Vickers hardness was 24.7 (0.1 HV), the 4 mm surface resistance was 624.26 Ω, the friction coefficient was 0.237, and the wear rate was 0.942×10 -5 mm 3 / N•m. Example

[0032] The mass percentages of the components of the high temperature corrosion resistant fluorine-containing conductive composite material are as follows: 15% of polytetrafluoroethylene, 28% of polytrifluorochloroethylene, 27% of tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, 25% of carbon fiber, and 5% of graphite.

[0033] Specific preparation steps: 1. First, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, polytrifluorochloroethylene and polytetrafluoroethylene are mixed evenly at least three times by using a high-speed mechanical stirrer by dry mixing process, and then carbon fiber and graphite are added, mixed evenly and dried; 2. Pour the mixed mold material into the mold for hot pressing and sintering at a molding temperature of 380°C and a pressure of 10MPa, and demold after natural cooling; 3. Cut, grind and surface treat the fluorine-containing composite material prepared in step 2 for subsequent use.

[0034] The fluorine-containing composite material prepared in this example was directly contacted with a mixed solution of 98% H2SO4 and H2O2 in a ratio of 3:1 at 200°C to conduct a concentrated sulfuric acid corrosion test. No obvious color change was observed after the sample was placed for 24 hours.

[0035] The hardness, surface resistance, and friction and wear performance of the fluorine-containing material prepared in this embodiment were tested, and the Vickers hardness was 25.6 (0.1 HV), the 4 mm surface resistance was 944.26 Ω, the friction coefficient was 0.235, and the wear rate was 0.997×10 -5 mm 3 / N•m.

[0036] Figure 1 is a histogram of the hardness of the composite material in each embodiment of the present invention; Figure 2 A histogram showing the wear rate of the composite material in each embodiment of the present invention; Figure 3 A histogram of the friction coefficient of the composite material in each embodiment of the present invention; Figure 4 is a 4mm surface resistance bar graph of the composite material in each embodiment of the present invention; Figures 1 to 4It can be concluded that the conductive corrosion-resistant fluoropolymer modified by the carbon fiber and graphite composite of the present invention has excellent corrosion resistance, mechanical strength, conductivity and high temperature resistance, can effectively resist corrosion from high-temperature corrosive solutions, and can still maintain stable electrical properties in high temperature and strong corrosive environments.

[0037] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0038] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A conductive, corrosion-resistant, fluorine-containing material, characterized in that: The invention comprises the following components in percentage by mass: 10-30% carbon fiber, 0-10% graphite, 10-30% polytetrafluoroethylene, 10-30% polychlorotrifluoroethylene, and 10-30% tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer.

2. The method for preparing the conductive, corrosion-resistant, fluorine-containing material according to claim 1, characterized in that: The average particle size of the polytetrafluoroethylene is 75 μm.

3. The method for preparing the conductive, corrosion-resistant, fluorine-containing material according to claim 1, characterized in that: The particle size of the polychlorotrifluoroethylene is 25 to 50 μm.

4. The method for preparing the conductive, corrosion-resistant, fluorine-containing material according to claim 1, characterized in that: The particle size of the tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer is 30-60 μm.

5. The method for preparing the conductive, corrosion-resistant, fluorine-containing material according to claim 1, characterized in that: The length of the carbon fiber used is 200 μm and the diameter is 5 to 10 μm.

6. The method for preparing the conductive, corrosion-resistant, fluorine-containing material according to claim 1, characterized in that: The size of the graphite used ranges from 1 to 10 μm and the thickness ranges from 2 to 5 μm.

7. The method for preparing the conductive, corrosion-resistant, fluorine-containing material according to claim 1, characterized in that: The steps include: Step 1), 10-30% of polytetrafluoroethylene, 10-30% of polytrifluorochloroethylene, and 10-30% of tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer are mixed evenly by dry mixing process, and then 10-30% of carbon fiber and 0-10% of graphite are added, mixed evenly and dried to obtain a mixed mold material; Step 2), pour the mixed mold material into the mold for hot pressing and sintering, the molding temperature is 360-380°C, the pressure is 5-15MPa, and the mold is demolded by natural cooling to obtain a conductive, corrosion-resistant, fluorine-containing material.

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