JP4073540B2 - Water repellent member and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water repellent member having improved water repellency of a member that causes inconveniences such as condensation, water generation, and dielectric breakdown, for example, a building material for housing and an insulator for electrical insulation, and a method for manufacturing the same.
[0002]
[Prior art]
Conventionally, for this type of member, a hydrophilic ceramic or synthetic resin is used, and the member is used as it is exposed.
[0003]
[Problems to be solved by the invention]
For example, a member such as an insulator for electrical insulation has a defect that water drops adhere to the outer surface of the member in a weather situation such as rain or fog, and the electrical insulation becomes worse, and in an aluminum sash that is a housing building material, In winter, a lot of water droplets are generated due to condensation, and the water droplets cause wrinkles.
[0004]
An object of the present invention is to provide a water-repellent member that can easily prevent adhesion of water droplets, and to provide a method suitable for manufacturing the member.
[0005]
[Means for Solving the Problems]
In the present invention, the monomer is plasma polymerized using glow discharge generated by applying a DC high voltage in a vacuum, and the above-described member is provided on the surface with a water-repellent plasma polymerized film obtained on the positive electrode side. Achieve the goal. The plasma polymerized film is preferably a plasma polymerized film using a vinylidene fluoride monomer as a raw material.
[0006]
Another object of the present invention is to introduce a monomer gas of vinylidene fluoride as a raw material gas into the vacuum processing chamber under vacuum, and apply a positive DC high voltage to the mesh electrode provided immediately above the surface of the member to be processed prepared in the vacuum processing chamber. This is achieved by controlling the pressure of the monomer gas and the applied voltage to generate glow discharge to cause plasma polymerization, and forming a water-repellent plasma polymerization film on the surface of the member to be processed. The member to be treated is preferably made of, for example, metal, glass, ceramics or synthetic resin.
[0007]
In addition, a member to be processed made of metal, glass, ceramics or synthetic resin is prepared in a vacuum processing chamber under vacuum, and a positive DC high voltage is applied directly to the member to be processed or to an electrode holding the member to be processed. The above object can also be achieved by controlling the pressure of the monomer gas and the applied voltage to generate glow discharge to cause plasma polymerization, and forming a water-repellent plasma polymerization film on the surface of the member to be processed. The
[0008]
The member to be treated is preferably a building material for housing such as a sash or an insulator.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
As described above, as the member to be processed for obtaining the water repellent member of the present invention, a member to be processed made of glass, ceramics, synthetic resin or metal, which is generally used, is used. According to an example of the embodiment of the present invention, the water-repellent member is formed by forming a water-repellent plasma polymerized film 2 directly on at least one surface of the member 1 to be treated, as shown in FIG. As the plasma polymerized film 2, vinylidene fluoride monomer gas is decomposed and excited in a plasma generated by applying a DC high voltage and polymerized on the surface of the member to be processed 1 to form a vinylidene fluoride film. A polymer film is suitable because it has sufficient water repellency. The plasma polymerized film 2 is usually formed to a thickness of 100 to 300 nm.
[0010]
According to the experiments by the present inventors, the plasma polymerized film has the property of increasing the contact angle of water droplets contacting the plasma polymerized film, and the contact angle is approximately proportional to the applied voltage when the plasma polymerized film is formed. However, in this case, it is necessary to form a conductive film on the member to be processed prior to film formation, and this conductive film formation process complicates the film formation process and causes an increase in cost. Thus, further experiments were conducted, and the film forming method and the type of film that could be manufactured easily and inexpensively were explored. The contact angle is also substantially proportional to the pressure of the monomer gas during the formation of the plasma polymerized film. If the pressure of the monomer gas and the applied voltage are controlled during the formation of the plasma polymerized film, the contact angle with water is high, especially when the film is formed on the positive electrode side, the water-repellent plasma polymerization exceeds 160 °. It has been found that membranes can be produced. Further, when a plasma polymerized film is obtained using a vinylidene fluoride monomer gas, the contact angle of the polymerized film changes in proportion to the gas pressure, so this monomer is convenient as a raw material for the plasma polymerized film.
[0011]
An example of an apparatus that can be used for carrying out the manufacturing method of the present invention is as shown in FIG. 2, and is an inlet from an evaporation source containing a vacuum exhaust port 3 connected to a vacuum pump and a raw material monomer 4 of a plasma polymerization film 2. 10, a processing member 1 made of a glass plate, a ceramic plate, a synthetic resin plate, or a metal plate is placed on a holding member (not shown) and opposed to the counter electrode 7. The mesh electrode 6 connected to the DC power source 8 is provided immediately above the film formation surface of the member 1 to be processed, that is, the surface facing the counter electrode 7.
[0012]
When the apparatus is used, first, the inside of the vacuum processing chamber 5 is evacuated to 10 ⁻² Pa, for example, and the vapor of the raw material monomer 4 is supplied from the evaporation source while adjusting the monomer gas introduction valve 9. To a predetermined pressure, for example, 30 Pa. Next, when a positive DC high voltage is applied to the mesh electrode 5 from the DC power supply 8, glow discharge is generated, whereby the vapor is decomposed and excited to form a plasma polymerized film 2 on the member 1 to be processed. .
[0013]
The applied voltage at the time of the formation of the plasma polymerized film 2 and the contact angle of the film 2 with respect to water have a specific relationship. For example, when vinylidene fluoride monomer is used and the pressure is set to 30 Pa, as shown in FIG. The contact angle of the water droplet changes in proportion to the applied voltage, and a film with good water repellency having a contact angle of 160 ° under a voltage of +1 kV can be obtained.
[0014]
If the applied voltage is 1 kV or higher, the discharge becomes unstable and uniform film formation cannot be performed. If the gas pressure is higher than 30 Pa, the contact angle with water decreases, and if it is lower than 30 Pa, the discharge occurs. It becomes unstable.
[0015]
The dimension and shape of the member 1 to be processed are arbitrary. For example, even if the member to be processed has a curved surface or a member to be processed having a large surface area of 1 × 1 m, the mesh electrode 5 is placed on the surface of the member 1 to be processed. By providing along, the plasma polymerization film | membrane 2 can be formed into a film uniformly. The distance between the surface of the member 1 to be processed and the mesh electrode 6 is preferably about 10 mm.
[0016]
Further, another example of an apparatus that can be used for carrying out the manufacturing method of the present invention is a holding apparatus for holding the member to be processed directly or without the mesh electrode in the apparatus shown in FIG. A positive DC high voltage can be applied to the electrode serving also as a member. That is, in this apparatus, a member made of metal, glass, ceramics or synthetic resin is used as a member to be treated. However, a positive DC high voltage is directly applied to the member to be treated, or the material to be treated. A glow discharge can be generated by applying a positive DC high voltage to the member holding electrode. Using such an apparatus, a water-repellent plasma polymerized film can be formed in the same manner as the apparatus shown in FIG.
[0017]
【Example】
Example 1
A plate glass window substrate 1 having a thickness of 5 mm and a length and width of 0.3 × 0.3 m is installed in the vacuum processing chamber 5 using the apparatus having the configuration shown in FIG. After evacuating to ^-2 Pa, monomer vapor was introduced into the chamber 5 from the evaporation source containing vinylidene fluoride monomer through the inlet 10, the pressure was adjusted to 30 Pa, and a high voltage of +1 kV was applied to the mesh electrode 6. A voltage was applied. When glow discharge occurs between the mesh electrode 6 and the counter electrode 7 and the plasma polymerization film 2 of vinylidene fluoride is formed on the surface of the window base material 1 with a thickness of 100 nm, the application of voltage is stopped. The glow discharge was extinguished and the film formation was stopped there. When the obtained window material was inclined and water droplets were applied to the surface, the water droplets flowed down as they were, and no water film was formed. The contact angle of this vinylidene fluoride plasma polymerized film was 160 °.
[0018]
In the above embodiment, a plate glass window substrate is used as the member to be treated. However, the plasma contact film obtained by using the member to be treated consisting of a metal plate, a ceramic plate and a synthetic resin plate also has a high contact angle. A water-repellent plasma polymerized film having the following was obtained.
[0019]
Thus, it is possible to improve the water repellency of residential building materials and insulators.
[0020]
(Example 2)
Using the apparatus shown in FIG. 2 that does not have a mesh electrode in a vacuum chamber, a metal plate to be processed having a thickness of 2 mm and a height and width of 0.4 × 0.4 m is installed in the vacuum chamber. Then, a high voltage of +1 kV was directly applied to the member to be processed, and a film formation process was performed in the same manner as in Example 1. As in Example 1, a water-repellent plasma polymerized film having a high contact angle was formed. done.
[0021]
In place of the metal plate, a synthetic resin plate or ceramic plate having a thickness of 5 mm and a width and width of 0.3 × 0.3 m is placed on the electrode for holding the member to be processed, and a positive DC high voltage is applied to the electrode. Then, when a film formation process was performed in the same manner as in Example 2, a water-repellent plasma polymerization film having a high contact angle could be formed as in Example 2.
[0022]
【The invention's effect】
According to the present invention, a water-repellent film made of vinylidene fluoride polymer obtained on the positive electrode side by plasma polymerization using glow discharge generated by applying a positive DC high voltage is the surface of the member to be treated. Therefore, it is possible to provide a highly water-repellent member that is easy to manufacture and inexpensive to manufacture, and that can easily prevent water droplets from being attached.
[0023]
According to the production method of the present invention, in a vacuum, introducing a monomer gas, and applying a positive DC high voltage to the mesh electrode provided directly on the surface of the vacuum treatment chamber of the member to be processed, the monomer gas Plasma polymerization is performed by controlling the pressure and applied voltage to generate glow discharge, or generating a glow discharge by applying a positive DC high voltage directly to the member to be processed or to the electrode holding the member to be processed. Since the water-repellent plasma polymerized film is directly formed on the surface of the member to be treated, the pressure of the monomer gas and the applied voltage during the formation of the plasma polymerized film are controlled so When forming a film on the contact angle, particularly on the positive electrode side, a highly water-repellent member having a plasma polymerization film that has a contact angle exceeding 160 ° and can easily prevent adhesion of water droplets can be easily and Inexpensive It can be produced.
[Brief description of the drawings]
FIG. 1 is a cut side view of an example of a water repellent member of the present invention.
FIG. 2 is a schematic cross-sectional view of an example of an apparatus used in the manufacturing method of the present invention.
FIG. 3 is a diagram showing a relationship between an applied voltage and a contact angle of a plasma polymerization film with water.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 To-be-processed member (window base material) 2 Plasma polymerization film | membrane 3 Vacuum exhaust port 4 Monomer 5 Vacuum processing chamber 6 Reticulated electrode 7 Counter electrode 8 DC power supply 9 Monomer gas introduction valve 10 Inlet port

Claims (5)

  Under vacuum, a monomer gas of vinylidene fluoride is introduced as a source gas into the vacuum processing chamber, and a positive DC high voltage is applied to the mesh electrode provided immediately above the surface of the member to be processed prepared in the vacuum processing chamber. A water-repellent member is obtained by plasma-polymerizing by generating glow discharge by controlling the pressure and the applied voltage, and forming a water-repellent plasma-polymerized film on the surface of the treated member. Manufacturing method of member.   Under vacuum, a monomer gas of vinylidene fluoride is introduced as a raw material gas into the vacuum processing chamber, and a positive DC high voltage is applied directly to the target member prepared in the vacuum processing chamber or to the electrode holding the target member. And plasma polymerization is performed by generating glow discharge by controlling the pressure of the monomer gas and the applied voltage, and a water-repellent plasma polymerized film is formed on the surface of the treated member to obtain a water-repellent member. A method for producing a water repellent member.   The method for producing a water-repellent member according to claim 1 or 2, wherein the pressure of the monomer gas is 30 Pa and the applied voltage is +1 kV. A water-repellent member comprising a vinylidene fluoride polymer film formed by the method according to claim 1 and having a water-repellent film having a contact angle with water exceeding 160 ° on the surface.   The water repellent member according to claim 4, wherein the water repellent member is a water repellent sash or an insulator.

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