TW202128898A - Fluororesin-coated member - Google Patents

Abstract

The present invention provides a fluororesin-coated member which has a base material and a coating layer that covers at least a part of the base material, wherin the coating layer is formed of a fluororesin mixture containing at least a first fluororesin and a second fluororesin, the melting point of one fluororesin is higher than the melting point of the second fluororesin, the surface of the coating layer has a sea-island structure, and the island phase of the sea-island structure is composed mainly of the first fluororesin.

Description

Components coated with fluororesin

The present invention relates to a member coated with a fluororesin, and more specifically, relates to a member having a coating layer formed of a fluororesin exhibiting a water-repellent function.

It is known that the surface of fluororesin has a water repellent function.

For example, Patent Document 1 discloses a fluorine gas-treated polytetrafluoroethylene water-based cleaning aid (jig, also called a jig). In addition, it is disclosed that the surface of the water-based cleaning aid made of polytetrafluoroethylene is treated with fluorine gas, which has the effect of reducing surface energy and excellent drainage (see Patent Document 1 [Abstract], [0013], etc.).

[Prior Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 7-142433

Since Patent Document 1 discloses that the drainage of the auxiliary device is improved by fluorine gas treatment when compared with the untreated PTFE auxiliary device, it can be considered that the water-repellent function of the auxiliary device is certain by the fluorine gas treatment. However, fluorine gas, which is relatively difficult to handle, must be used to separately treat the molded product, which may complicate the manufacturing steps.

On the other hand, in recent years, a surface with a higher water-repellent function is required.

Generally, the strength of the water repellent function is evaluated by the size of the contact angle between the surface of the fluororesin and water. Since the greater the contact angle, the greater the hydrophobicity, so the surface showing a larger contact angle with water has a higher water repellent function. Since the contact angle between the surface of the fluororesin and water is usually 80 to 115°, the contact angle must be increased.

The object of the present invention is to provide a fluororesin-coated member having an excellent water repellent function, which can be easily manufactured without special treatment steps for improving the water repellent function. Since the fluororesin-coated member has an excellent water repellent function, for example, when it comes into contact with a corrosive chemical solution, the corrosion resistance can be further improved, and when it comes into contact with a high temperature chemical solution, the thermal insulation can be further improved.

As a result of in-depth research, the inventors found that by calcining a member coated with a mixture of two fluororesins with different melting points at a temperature between the melting points of the two fluororesins, a coating with a larger contact angle with water can be obtained. There is a fluororesin component which has an excellent water repellent function, thus completing the present invention.

This manual contains the following implementation types.

1. A member coated with a fluororesin, comprising a substrate and a coating layer covering at least a part of the substrate, the coating layer being formed of a fluororesin mixture containing at least a first fluororesin and a second fluororesin, the aforementioned The melting point of the first fluororesin is higher than the melting point of the aforementioned second fluororesin, and the aforementioned The surface of the coating layer has a sea-island structure, and the island phase of the sea-island structure is composed of the first fluororesin as a main component.

2. A fluororesin-coated member comprising a substrate and a coating layer covering at least a part of the substrate, the coating layer being formed of a fluororesin mixture containing at least a first fluororesin and a second fluororesin, the aforementioned The contact angle between the surface of the coating layer and the water droplets is 120° or more.

3. A method of manufacturing a fluororesin-coated member, comprising: a mixing step of mixing at least a first fluororesin and a second fluororesin to obtain a fluororesin mixture, and coating the aforementioned fluororesin mixture on at least a part of a substrate to obtain The coating step of the fluororesin-coated member and the firing step of calcining the fluororesin-coated member to obtain the fluororesin-coated member, wherein, in the firing step, the melting point of the first fluororesin and Calcined at a temperature between the melting point of the aforementioned second fluororesin.

The fluororesin-coated member of the embodiment of the present invention has an excellent water-repellent function only through the step of coating the fluororesin. Since the fluororesin-coated member has an excellent water-repellent function, for example, when it comes into contact with a corrosive chemical solution, the corrosion resistance can be further improved, and when it comes into contact with a high-temperature chemical solution, the thermal insulation can be further improved.

FIG. 1A shows the SEM image (surface shape) of the coating layer of Example 4. FIG.

Figure 1B shows the SEM image of the coating layer of Example 4 (elemental mapping of chlorine).

FIG. 2A shows the SEM image (surface shape) of the coating layer of Example 6. FIG.

Fig. 2B shows the SEM image of the coating layer of Example 6 (elemental mapping of chlorine).

Figure 3 shows that the fluororesin-coated member of Example 11, the fluororesin-coated member of Comparative Example 4, and the member (base material (A2) itself) of Comparative Example 5 were given hot water (80°C) and water (20. ℃) thermal history (thermal cycle) temperature change.

Figure 4 is a photograph showing the fluororesin-coated member of Example 11 immersed in hot water (80°C). An air layer is formed on the surface of the coating layer.

The fluororesin-coated member of the embodiment of the present invention has a substrate and a coating layer covering at least a part of the substrate, and the coating layer contains at least the first fluororesin (hereinafter referred to as "first fluororesin"). ) And the second fluororesin (hereinafter referred to as the "second fluororesin") fluororesin mixture is formed.

In the embodiment of the present invention, the "substrate" is preferably one that can support the coating layer and is excellent in heat resistance and chemical resistance, as long as it is a substrate that can obtain the fluororesin-coated member of the embodiment of the present invention That is, there is no particular limitation.

Examples of such substrates include: aluminum, stainless steel, iron, other metals or alloys formed of several such metals, inorganic compounds such as quartz glass, ceramics, polyether ether ketone (PEEK), polyether ketone ( PEK) and other aromatic polyether ketones, polyether sulphur (PES), polyimide resins, polyimide resins and other plastics, etc., and metal and inorganic compounds are preferred. Since metal or inorganic compounds can be used to achieve high heat resistance and durability, and it is easy to ensure cleanliness, it can be suitably used as a component of precision machine manufacturing equipment such as semiconductor manufacturing equipment. As long as the practice of the present invention can be obtained There are no special restrictions on the shape and size of the base material for the fluororesin-coated member of the cast form. Examples are: plate, rod, cylinder, cone, comb blade shape, etc., which can be matched The shape and size of the fluororesin-coated member are appropriately selected for the purpose.

In an embodiment of the present invention, the coating layer covers at least a part of the substrate. The coating layer is formed of a fluororesin mixture containing at least a first fluororesin and a second fluororesin.

In the embodiment of the present invention, "first fluororesin" and "second fluororesin" refer to resins that can be generally understood as fluororesin, and the melting point of "first fluororesin" is higher than that of "second fluororesin" The melting point is not particularly limited as long as the fluororesin-coated member of the embodiment of the present invention can be obtained. In addition, the terms "first" and "second" are attached for convenience of explanation and do not limit these expressions. It means that any one of the fluororesin has a higher melting point than the other fluororesin (the two kinds of fluororesin The melting point is different, the melting point of the first fluororesin is different from the melting point of the second fluororesin).

Examples of the fluororesin constituting the first fluororesin and the second fluororesin include: polytetrafluoroethylene (PTFE) (melting point: about 327°C), modified polytetrafluoroethylene (modified PTFE) (melting point: about 327°C) , Tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer (PFA) (melting point: about 310°C), tetrafluoroethylene/hexafluoropropylene copolymer (FEP) (melting point: about 260 to 275°C), ethylene/tetrafluoroethylene Fluoroethylene copolymer (ETFE) (melting point: about 270°C), ethylene/chlorotrifluoroethylene copolymer (ECTFE) (melting point: about 245°C), polychlorotrifluoroethylene (PCTFE) (melting point: about 210 to 220°C) ), polyvinylidene fluoride (PVDF) (melting point: about 156 to 178°C) and polyvinyl fluoride (PVF) (melting point: about 203°C), etc.

In the embodiment of the present invention, the fluororesin is preferably in the form of particles and has an average particle diameter of 500 μm or less, preferably having an average particle diameter of 1 to 250 μm, and even more preferably having an average particle diameter of 3 to 50 μm. Preferably, it is particularly preferable to have an average particle size of 5 to 25 μm.

_{In this specification, the average particle size of the particles refers to the average particle size D 50} that can be obtained by measuring the particle size distribution using a laser diffraction scattering particle size distribution device (manufactured by Nikkiso "MT3300II"). The median diameter of the 50% of the cumulative value of the particle size distribution obtained by the method).

As the fluororesin, general commercial products can be used, and the commercial products are those that can be used as coatings for coating the fluororesin.

The difference between the melting point of the first fluororesin and the melting point of the aforementioned second fluororesin is preferably 10°C or more, more preferably 12 to 150°C, and more preferably 15 to 120°C.

When the difference between the melting point of the first fluororesin and the melting point of the aforementioned second fluororesin is 10° C. or more, there is an advantageous effect that the temperature of the firing step can be easily controlled, and productivity can be improved.

The coating layer of the fluororesin-coated member of the embodiment of the present invention only needs to mix the first fluororesin and the second fluororesin. Although the mixing ratio is not particularly limited, it is from 1:9 to 9:1 ( The mass ratio of the first fluororesin: the second fluororesin) is preferably contained, and the mass ratio of 2:8 to 9:1 is more preferred.

If the coating layer of the fluororesin-coated member is mixed with the first fluororesin and the second fluororesin, the water-repellent function will be improved compared with the respective water-repellent function (the size of the contact angle). .

The surface of the coating layer of the fluororesin-coated member of the embodiment of the present invention preferably has a phase separation structure.

In the present disclosure, the phase-separated structure means that the first phase with the aforementioned first fluororesin as the main component and the second phase with the aforementioned second fluororesin as the main component will not melt and the two phases are completely mixed, but Two intersecting structures. Although both the first phase and the second phase can be melted to form a smooth phase, it is preferable that at least one of them has a granular shape of resin. The first phase contains more than 50% by mass The above-mentioned first fluororesin is preferable, more preferably 60% by mass or more, more preferably 70% by mass or more, and more preferably 80% by mass or more. The second phase system preferably contains 50% by mass or more of the above-mentioned second fluororesin, more preferably 60% by mass or more, more preferably 70% by mass or more, and even more preferably 80% by mass or more.

The surface of the coating layer of the fluororesin-coated member of the embodiment of the present invention preferably has a sea-island structure.

In the present disclosure, the sea-island structure refers to a structure composed of two parts: a smooth and substantially flat part (called "sea") and a part that clearly exhibits unevenness (called "island"). The presenting concave and convex of the island part can be the overlap of the particles. The existence ratio of the sea part and the island part does not necessarily have to be more than the sea part, the island part does not necessarily have to be surrounded by the sea part, and the island part can also surround the sea part. The smooth and flat sea part can be melted to adhere the island part to the base material, or the coating layer can be fixed to the base material.

The island phase (island portion) of the sea-island structure is preferably composed of the aforementioned first fluororesin as a main component.

The island phase system preferably contains 50% by mass or more of the above-mentioned first fluororesin, more preferably 60% by mass or more, more preferably 70% by mass or more, and more preferably 80% by mass or more.

The sea phase (sea part) of the sea-island structure is preferably composed of the aforementioned second fluororesin as a main component.

The marine system preferably contains 50% by mass or more of the above-mentioned second fluororesin, more preferably 60% by mass or more, more preferably 70% by mass or more, and even more preferably 80% by mass or more.

The combination of the first fluororesin and the second fluororesin is not particularly limited as long as it is a combination of those with a melting point difference among the above-mentioned fluororesins. Examples include: polytetrafluoroethylene (PTFE) and tetrafluoroethylene The combination of olefin/perfluoroalkyl vinyl ether copolymer (PFA), the combination of PTFE and polychlorotrifluoroethylene (PCTFE), the combination of PTFE and tetrafluoroethylene/hexafluoropropylene copolymer (FEP), the combination of PTFE and ethylene /The combination of tetrafluoroethylene copolymer (ETFE), the combination of modified polytetrafluoroethylene (modified PTFE) and PFA, the combination of modified PTFE and PCTFE, the combination of modified PTFE and FEP, the combination of modified PTFE and ETFE Combination, combination of PFA and PCTFE, combination of PFA and FEP, combination of PFA and ETFE.

The combination of the first fluororesin and the second fluororesin is preferably a combination of PTFE and PFA, a combination of PTFE and PTCFE, a combination of modified PTFE and PFA, a combination of modified PTFE and PTCFE, and a combination of PFA and PCTFE.

The contact angle of the water droplets on the surface of the coating layer of the fluororesin-coated member of the embodiment of the present invention is preferably 120° or more, more preferably 120° to 170°, and more preferably 135° to 170° , 150° to 170° is even better.

When the contact angle of the water droplets on the surface of the coating layer is 120° or more, it has the advantageous effect of reducing the contact state of the liquid continuously in contact with the coating surface due to the improvement of its water repellent function.

Therefore, the fluororesin-coated member of the embodiment of the present invention has excellent heat insulation and solvent resistance in applications where the surface of the coating layer is brought into contact with a solvent (for example, an aqueous solvent). This is considered to be due to the low wettability of the coating layer with respect to solvents (or media) such as water, which inhibits contact with the solvent. As a result, the coating layer is excellent in heat insulation and solvent resistance.

In an embodiment of the present invention, there is provided a method of manufacturing a member coated with a fluororesin, which includes

The mixing step of mixing at least the first fluororesin and the second fluororesin to obtain a fluororesin mixture (or dispersion or dispersion),

The coating step of applying the aforementioned fluororesin mixture to at least a part of the substrate to obtain a fluororesin-coated member, and

The calcination step of calcining the aforementioned fluororesin-coated member to obtain the fluororesin-coated member, wherein:

In the calcination step, calcination is performed at a temperature between the melting point of the first fluororesin and the melting point of the second fluororesin.

The manufacturing method of the fluororesin-coated member of the embodiment of the present invention includes a mixing step of mixing at least the first fluororesin and the second fluororesin to obtain a fluororesin mixture (or dispersion or dispersion).

For the first fluororesin and the second fluororesin, refer to the description of the above-mentioned first fluororesin and the second fluororesin.

In the mixing step, the mixing method and mixing conditions (mixing temperature, mixing speed, dispersing solvent, mixing concentration), etc., can be appropriately selected as long as the fluororesin-coated member of the embodiment of the present invention can be manufactured.

The fluororesin mixture only needs to be mixed with the first fluororesin and the second fluororesin. Although the mixing ratio is not particularly limited, it should be in a mass ratio of 1:9 to 9:1 (first fluororesin: second fluororesin) The content is better, and the quality ratio of 2:8 to 9:1 is better.

If the coating layer of the fluororesin-coated member is mixed with the first fluororesin and the second fluororesin, the water-repellent function will be improved compared with the respective water-repellent function (the size of the contact angle). .

The difference between the melting points of the first fluororesin and the second fluororesin in the fluororesin mixture is preferably 10°C or more, more preferably 12 to 150°C, and more preferably 15 to 120°C.

When the difference between the melting point of the first fluororesin and the melting point of the second fluororesin is 10° C. or more, the temperature of the calcination step can be easily controlled and productivity can be improved.

The manufacturing method of the fluororesin-coated member of the embodiment of the present invention includes a coating step of applying the aforementioned fluororesin mixture to at least a part of the base material to obtain the fluororesin-coated member.

Regarding the substrate, refer to the above-mentioned description of the substrate.

In the coating step, the coating method and coating conditions can be appropriately selected from commonly known conditions in powder coating, spray coating, and the like.

The method of manufacturing the fluororesin-coated member of the embodiment of the present invention includes a calcination step of calcining the fluororesin-coated member to obtain the fluororesin-coated member. The calcination step includes the first fluororesin-coated member. It is calcined at a temperature between the melting point and the melting point of the aforementioned second fluororesin.

In the calcination step, the calcination method and calcination conditions can be appropriately selected from conventionally known conditions.

The firing temperature is a temperature between the melting point of the first fluororesin and the melting point of the second fluororesin. It is presumed that as long as the firing is performed in this temperature range, although the second fluororesin will melt, the first fluororesin will not melt. Therefore, despite the formation of the coating layer, the surface of the coating layer can preferably be uneven.

Since moderate unevenness is formed on the surface of the coating layer, the fluororesin-coated member of the embodiment of the present invention can be easily manufactured without special processing steps to improve the water repellency function. Nevertheless, it can exhibit excellent repellency. Water function, and can show excellent heat insulation, solvent resistance, etc. In addition, although it is considered that the members of the embodiment of the present invention have excellent effects for the above-mentioned reasons, the present invention is not limited to such reasons.

The fluororesin-coated member of the embodiment of the present invention can be suitably used for applications where a fluororesin-coated member has been used so far. In addition, the fluororesin-coated member of the embodiment of the present invention can be suitably used for applications requiring heat resistance and solvent resistance.

The fluororesin-coated member of the embodiment of the present invention can be suitably used in, for example, semiconductor manufacturing equipment, liquid crystal manufacturing equipment, solar cell manufacturing equipment, pharmaceutical manufacturing equipment, chemical medicine manufacturing equipment, and the like.

[Example]

Hereinafter, although examples and comparative examples are used to specifically describe the present invention in detail, these examples are only one form of the present invention, and the present invention is not limited to these examples.

The ingredients used in this example are shown below.

(A) Substrate

(A1) 2mm thick aluminum plate (100mm×50mm) (also known as "(A1) aluminum substrate")

(A2) Prepare cylindrical SUS 304 (Φ10mm×100mm) (also known as "(A2)SUS base material") with a hole (Φ2mm×50mm) provided in the center of the end on one side in the axial direction

(B) Fluorine resin

(B1) Tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer (Neoflon (registered trademark) PFA ACX-34 (trade name) manufactured by Daikin Industrial Co., Ltd.), melting point 310°C, particle size D ₅₀ 25μm ("also known as (B1)PFA")

(B2) Polychlorotrifluoroethylene (Neoflon (registered trademark) PCTFE M-300H (trade name) manufactured by Daikin Industrial Co., Ltd., melting point 220°C, particle size D ₅₀ 9μm ("also known as (B2)PCTFE")

(B3) Polytetrafluoroethylene (Polyflon (registered trademark) PTFE Lubron (registered trademark) L-5 (trade name) manufactured by Daikin Industrial Co., Ltd.), melting point 327°C, particle size D ₅₀ 6μm ("also known as ( B3)PTFE'')

Determination of the average particle size (D ₅₀ ) of particles

The average particle size (D ₅₀ ) of the fluororesin is measured by using a laser diffraction scattering particle size distribution device ("MT3300II" manufactured by Nikkiso) to obtain the average particle size (D ₅₀ ) of the particles (indicated by The median diameter of 50% of the cumulative value of the particle size distribution obtained by the laser diffraction scattering method). The average particle diameter (D ₅₀ ) of each particle is as described above.

Manufacture of the fluororesin-coated member of Example 1

(B1) PFA and (B2) PCTFE are added to ethylene glycol monobutyl ether at a ratio of B1/B2=90/10 (mass ratio) and mixed to prepare a dispersion. This dispersion liquid was sprayed on the (A1) aluminum substrate to obtain a coating layer of fluororesin powder on the (A1) aluminum substrate. The coating layer was fired in an oven at 280°C for 60 minutes to obtain the fluororesin-coated member of Example 1. Since the coating layer has a sea-island structure, although its thickness is not uniform, it is approximately in the range of 25 to 50 μm.

Manufacture of fluororesin-coated components of Examples 2-9

Except that the fluororesin described in Table 1 was used at the mass ratio described in Table 1, the same method as that described in Example 1 was used to obtain the fluororesin-coated members of Examples 2 to 9.

Manufacture of the fluororesin-coated member of Example 10

Except that (B3) PTFE was used instead of (B1) PFA, and the calcination temperature was changed from 280°C to 320°C, the same method as that described in Example 5 was used to produce a fluororesin-coated member of Example 10.

Manufacture of the fluororesin-coated component of Comparative Example 1

Except that (B2) PCTFE was not used and the calcination temperature was changed from 280°C to 320°C, the same method as that described in Example 1 was used to produce a fluororesin-coated member of Comparative Example 1.

Manufacture of the fluororesin-coated member of Comparative Example 2

Except that (B1) PFA was not used, the same method as that described in Example 1 was used to produce a fluororesin-coated member of Comparative Example 2.

Manufacture of the fluororesin-coated component of Comparative Example 3

Except that the calcination temperature was changed from 280°C to 320°C, the same method as that described in Example 5 was used to produce a fluororesin-coated member of Comparative Example 3.

Measuring method of contact angle

The measurement was performed using a contact angle meter "FACE CA-DT" (trade name) manufactured by Kyowa Interface Science Co., Ltd. in accordance with JIS R 3257. Specifically, use a dispenser to drop a certain amount of liquid (pure water) on the surface of the sample placed horizontally, and obtain the "straight line connecting any end point of the sample surface contacted by the water droplet and the apex of the water droplet" and The angle between the "sample surface". The contact angle θ is calculated by setting it to twice (theta/2 method).

Surface shape observation and element analysis of the coating

Using a scanning electron microscope (SEM) "FrexSEM 1000" (trade name) with an energy dispersive X-ray (EDX) analyzer manufactured by Hitachi High-Technologies Co., Ltd., the above-mentioned Examples 4 and 6 were coated with fluororesin Observe the surface shape of the coating layer and analyze the elements of the components.

After observing the surface shape at an acceleration voltage of 15.0 kV and 500 times, the elemental mapping of chlorine was performed. The image of the surface shape of the coating layer of Example 4 is shown in FIG. 1A, the elemental reflection of chlorine The shot image is shown in Figure 1B. The image of the surface shape of the coating layer of Example 6 is shown in FIG. 2A, and the image of the elemental mapping of chlorine is shown in FIG. 2B.

Thermal insulation

(A2) SUS substrate was used as the substrate.

The coating layer (film thickness of 150 μm) of Example 5 was applied to the entire surface of the substrate to obtain a fluororesin-coated member of Example 11.

The coating layer (film thickness of 150 μm) of Comparative Example 2 was applied to the entire surface of the substrate to obtain a fluororesin-coated member of Comparative Example 4.

The base material itself was used as a member of Comparative Example 5.

Insert the thermocouple into the hole provided at the end of the SUS substrate of each component (A2) on one side in the axial direction, and soak the end 80 mm on the other side of the axial direction in hot water (80°C) for 15 seconds. Then, the end portion 80 mm on the other side of the axial direction was immersed in cold water (20° C.) for 15 seconds. Repeat this thermal cycle 5 times.

The results are shown in Figure 3. Since the fluororesin-coated member of Example 11 has a low temperature increase rate and a low temperature decrease rate, it can be seen that the heat insulation effect is high. In addition, since the temperature change of the member is small, it can be seen that the fluororesin-coated member has less heat-induced stress.

In addition, a photograph of the fluororesin-coated member of Example 11 immersed in hot water (80°C) is shown in FIG. 4. It can be seen that an air layer is formed on the surface of the coating layer. It is expected that the formation of this air layer will also contribute to the thermal insulation effect.

[Table 1]

[Table 2]

The fluororesin-coated members of Examples 1 to 11 are: (i) having a base material and a coating layer covering at least a part of the aforementioned base material, and the aforementioned coating layer is made of fluorine resin containing at least a first fluororesin and a second fluororesin. A resin mixture is formed, the melting point of the first fluororesin is higher than the melting point of the second fluororesin, the surface of the coating layer has a sea-island structure, and the island phase of the sea-island structure is composed of the first fluororesin as a main component; or (ii) Having a substrate and a coating layer covering at least a part of the substrate, the coating layer is formed of a fluororesin mixture containing at least a first fluororesin and a second fluororesin, and the contact angle of the water droplets on the surface of the coating is Above 120°. Therefore, the fluororesin-coated members of Examples 1 to 11 have excellent water repellency and excellent heat insulation properties.

In contrast, the fluororesin-coated members of Comparative Examples 1 to 4 did not satisfy the above-mentioned (i) or (ii), so the water repellency and heat insulation were not necessarily sufficient.

[Possibility of industrial application]

The fluororesin-coated member of the embodiment of the present invention has an excellent water-repellent function only through the step of coating the fluororesin. Since the fluororesin-coated member has an excellent water repellent function, for example, when it comes in contact with a corrosive chemical solution, it can further improve the corrosion resistance, and when it comes into contact with a high-temperature chemical solution, it can further improve the thermal insulation.

Related applications

In accordance with Article 4 of the Paris Convention, this application claims the priority of the application number 2019-221571 filed in Japan on December 6, 2019 as the basic application. The content of the basic application is incorporated into this specification by reference.

Claims (6)

A member coated with a fluororesin, which has a base material and a coating layer covering at least a part of the aforementioned base material, The aforementioned coating layer is formed of a fluororesin mixture containing at least a first fluororesin and a second fluororesin, The melting point of the first fluororesin is higher than the melting point of the second fluororesin, The surface of the aforementioned coating layer has a sea-island structure, The island phase of the sea-island structure is composed of the first fluororesin as a main component. The fluororesin-coated member according to claim 1, wherein the difference between the melting point of the first fluororesin and the melting point of the second fluororesin is 10°C or more. A member coated with a fluororesin, which has a base material and a coating layer covering at least a part of the aforementioned base material, The aforementioned coating layer is formed of a fluororesin mixture containing at least a first fluororesin and a second fluororesin, The contact angle of the water droplets on the surface of the coating layer is 120° or more. The fluororesin-coated member according to any one of claims 1 to 3, wherein the mixing ratio of the first fluororesin and the second fluororesin in the fluororesin mixture is 1:9 to 9:1 . A semiconductor manufacturing device, a liquid crystal manufacturing device, a solar cell manufacturing device, a medical product manufacturing device, or a chemical drug manufacturing device, which contains the fluororesin-coated member described in any one of claims 1 to 4. A method for manufacturing a fluororesin-coated component, which includes: The mixing step of mixing at least the first fluororesin and the second fluororesin to obtain a fluororesin mixture, A coating step of applying the aforementioned fluororesin mixture to at least a part of the substrate to obtain a fluororesin-coated member, and The calcination step of calcining the aforementioned fluororesin-coated member to obtain the fluororesin-coated member, wherein: In the calcination step, calcination is performed at a temperature between the melting point of the first fluororesin and the melting point of the second fluororesin.

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