WO2002060982A1

WO2002060982A1 - Surface treatment method and corona discharge treatment device

Info

Publication number: WO2002060982A1
Application number: PCT/JP2002/000576
Authority: WO
Inventors: Toshiki Takizawa
Original assignee: Kabushiki Kaisha Bridgestone
Priority date: 2001-01-30
Filing date: 2002-01-25
Publication date: 2002-08-08
Also published as: JP2002226614A

Abstract

A surface treatment method, comprising the steps of covering either of first and second electrodes disposed close to each other with an insulator, and installing the first and second electrodes close to the treated surface of a treated material so that even a non-conductive thick large material can be surface-treated efficiently, whereby the treated surface can be modified by bringing a corona discharge generated by applying a high-frequency high-voltage across the electrodes into contact with the treated surface of the treated material.

Description

Description Surface treatment method and corner discharge treatment equipment

The present invention relates to a method for performing surface treatment on a large non-conductive and thick object to be treated, and a corona discharge treatment apparatus used for the surface treatment. Background art

Conventionally, a method has been known in which the surface of a resin film such as polypropylene / polyethylene is subjected to a corona discharge treatment to improve the wettability of the surface of the resin film, thereby improving the coating property and adhesiveness. In the corona discharge treatment, as shown in Fig. 3, a pair of electrodes consisting of a discharge electrode 1 and a counter electrode 2 are arranged facing each other at a distance of several mm According to (3), a high-frequency voltage of several tens of kV is applied between the electrodes (1) and (2) to generate corona discharge between the electrodes (1) and (2) and a resin film between the electrodes (1) and (2). The object 50 to be treated is disposed, and the surface of the object to be treated is subjected to corona discharge treatment for reforming.

A highly reactive active group is generated on the surface of the object 50 due to the collision of electrons due to the corona discharge and the action of ozone and ultraviolet rays generated secondarily. Surface wetting characteristics and reactivity can be improved. In order to effectively perform the corona discharge treatment, the surface of one of the electrodes 1 and 2 (discharge electrode 1 in FIG. 3) is usually covered with a coating made of an insulating material such as vinyl chloride or Teflon. It is covered with member 4.

The corona discharge treatment is not limited to the above resin film, but is used only for surface treatment of non-conductive materials such as resin molded products, film surfaces of resin film laminate products, and resin painted surfaces of wood and the like. It is also used for surface treatment of metal such as photosensitive drums in developing devices. When the object to be processed is a conductive material, generally, the object to be processed is often used as a counter electrode.

However, in the corona discharge treatment, as described above, the workpieces 50 are paired with each other. It is effective when the object 50 is an extremely thin material such as the resin film described above, since it is installed between the opposite discharge electrode 1 and the opposite electrode 2. In the case of a material that has a problem, it is necessary to increase the distance between the electrodes, so that even when a high voltage is applied, no discharge may occur.

Therefore, for example, a film surface or resin-coated surface of a non-conductive and thick material such as a polyvinyl fluoride film laminated wood or a fluorinated resin-coated wood should be subjected to corner discharge treatment. Was difficult. The present invention has been made in view of the conventional problems, and provides a method for efficiently performing surface treatment even on a large non-conductive and thick material, and a corona discharge suitable for the surface treatment. It is an object to provide a processing device. · Disclosure of the invention

The surface treatment method according to claim 1, wherein one of the first and second electrodes arranged close to each other is covered with an insulating material, and both the first and second electrodes are A corona discharge generated by applying a high-frequency high voltage between the two electrodes is brought into contact with the processing surface of the object to be processed, and is disposed close to the processing surface of the object to be processed. By installing the first and second electrodes on the processing surface side of the object to be processed, a large non-conductive and thick material can be used. Even if there is, surface treatment can be performed efficiently.

The surface treatment method according to claim 2, wherein the first and second electrodes are moved in association with each other on the processing surface of the object to be processed, and corona discharge processing is performed on the processing surface of the object. This makes it possible to easily perform the surface treatment on the treated surface without moving the object to be treated.

A surface treatment method according to claim 3 is characterized in that a distance between the first electrode and the second electrode is set to 5 mm or less.

The surface treatment method according to claim 4, wherein the frequency is between 15 kHz and 50 kHz between the first electrode and the second electrode; A high-frequency voltage of 5 kV or less is applied. A surface treatment method according to claim 5 is characterized in that the treated surface of the object to be treated is a resin or a painted surface.

In the surface treatment method according to claim 6, the treated surface is a surface containing a fluororesin.

The corona discharge treatment device according to claim 1, wherein the first electrode is coated with a roll-shaped insulating material, and is disposed in close proximity to a treatment surface of the treatment object. A high-frequency high-frequency voltage is applied between the second electrode provided at a predetermined distance from the first electrode and the first and second electrodes, and a corona discharge is applied between the two electrodes. A high-voltage generator for generating an electric field, and moving a roll having the first electrode coated with an insulating material on the processing surface of the processing object while bringing the corona discharge into contact with the processing surface of the processing object. Thus, the processing surface is sequentially modified. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a diagram showing a configuration of a corona discharge treatment apparatus according to the best mode of the present invention.

FIG. 2 is a diagram showing an example of an electrode configuration in a corona discharge treatment device according to the best mode of the present invention.

FIG. 3 is a diagram showing a configuration of a conventional corona discharge treatment device. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the best mode of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing a configuration of a corona discharge treatment apparatus according to the present embodiment, where 10 is a first electrode provided in close proximity to a treatment surface 50 S of a workpiece 50, 2 Reference numeral 0 denotes a second electrode provided in the vicinity of the first electrode 10 described above, and the second electrode is on the same side as the first electrode 10 and the object 50, that is, It is installed on the processing surface 50 S side of the object 50. Reference numeral 30 denotes a high-frequency oscillator 31 and a high-voltage transformer 32. A high-frequency high-frequency voltage is applied between the first electrode 10 and the second electrode 20, and the electrodes 10 and 2 are applied. ◦A high voltage generator for generating a corona discharge between them, 40 is made of an insulating material, and is a roll-shaped coating for coating the surface of the second electrode 20 It is a member.

For example, as shown in FIG. 2, the first electrode 10 includes a roll-shaped covering member 40 made of a silicon tube in which a portion including a portion 10T facing the processing surface 5OS of the processing object 50 is formed of a silicon tube. Consists of a 3 mm diameter stainless steel rod covered with. At this time, a slight gap was provided between the stainless steel rod and the covering member 40 so that the covering member 40 could rotate on the processing surface. The second electrode 20 is made of a stainless steel flat plate having a thickness of 0.5 mm, a width of 10 mm, and a length of 80 mm, and the opposed portion 10T of the first electrode 10 and the second electrode 20 are formed. The first electrode 10 and the second electrode 20 are arranged such that the side surface 20T in the length direction is parallel to each other at a predetermined distance. .

Next, the corona discharge treatment performed by the apparatus having the above-described configuration will be described.

In the present best mode, the object 50 to be subjected to corona discharge treatment is made of a non-conductive, thick, large-sized material such as a fluororesin-coated wood.

First, the first electrode 10 covered with the covering member 40 is disposed on the fluororesin-coated surface, which is the treated surface 50S of the workpiece 50, and the second electrode 20 is placed on the treated surface. It is placed near the first electrode 10 on the 50S side. At this time, the distance between the first and second electrodes 10 and 20 is set to d = 1 mn! Set to ~ 5 mm. Next, the high-voltage generator 30 applies a high-frequency voltage between the electrodes 10 and 20 at a frequency f = 20 kHz to 40 kHz, a voltage V = 5 kV to 20 kV, and an output P = 10 W to 1000 W. And a corona discharge is applied between the first and second electrodes 10 and 20 (actually, between the side surface 40T of the covering member 40 facing the second electrode 20 and the side surface 20T of the second electrode 20). Generate. As shown in FIG. 1, the discharge area of this corona discharge comes into contact with the processing surface (fluorine-based resin-coated surface) 5 OS located immediately below the first and second electrodes 10 and 20. The fluororesin-coated surface is modified by corona discharge and activated.

In this example, the first electrode 10 and the second electrode 20 are integrated by, for example, disposing them in one housing, and the roll-shaped covering member 40 is attached to the processing surface of the workpiece 50. 5 By rotating on the OS, the first and second electrodes 10 and 20 are moved to perform a corona discharge treatment on the entire processing surface 50S of the workpiece 50. I'm trying.

The shapes and materials of the first electrode 10 and the second electrode 20 are not limited to the above examples, and may be appropriately determined by the shape and material of the processing surface 50S of the workpiece 50. I can do it.

In the above-described best mode, the covering member 40 is made of silicon rubber. However, natural rubber or ceramic may be used.

Also, the conditions of the corona discharge treatment such as the electrode spacing are appropriately determined by the shape and material of the treated surface 50 S of the object 50 to be treated and the processing specifications. The electrode distance d with the second electrode 20 is desirably set to 5 mm or less, the applied voltage V is 5 kV or more and 25 kV or less, and the frequency is 20 kHz to 4 kHz. It is desirable that ·

Further, in the above example, the object 50 to be treated is made of a fluorine-based resin-coated wood. However, the present invention is not limited to this, and the corona discharge treatment apparatus of the present invention may be a polyvinyl fluoride film or ethylene-tetrafluoroethylene. Resin film such as copolymer film, polyvinyl fluoride film laminated paper, polyethylene tetrafluoroethylene copolymer film laminated paper or laminated material such as polyvinyl fluoride film laminated wood, polyethylene sheet and propylene It can be applied to the surface treatment of sheet materials such as sheets, as well as painted building materials such as fluorinated resin-coated concrete extruded plates and fluorinated resin-painted ceramic siding boards. .

A 10 mm thick wooden plate on which polyvinylidene vinyl paper is stuck, the electrode spacing is lmm, the voltage between electrodes and the frequency are varied in various ways, and the electrodes are 1 meter / min. After performing corona discharge treatment by moving on the laminated paper at a high speed, a 1-part silicone sealing material (SH780) manufactured by Toray Dow Corning Co., Ltd. was applied to the treated surface with a width of 10 mm and a thickness of 5 mm. Table 1 shows the results of 90-degree tensile test and evaluation of the adhesiveness.

Also, as Comparative Example 1, the results for a sample without corona discharge treatment are also shown.

[table 1 ] ah oil j ^ ability

mL m) ± Adhesion Comparative Example 1 Treatment) Film-silicone sealant interface fracture failure

£ t Battle ά 3 kV 40 rl Z File Run Y Y Ws

Poor Invention 1 7kV 4 OkHz Silicone sealant material destruction good Invention 2 7kV 40kHz Silicone sealant material destruction good Invention 3 2 OkV 4 OkHz Silicone sealant material destruction Good Invention 4 7kV 20kHz Silicone sealant material良好 Good As is clear from Table 1, in Comparative Example 1 above, the silicone sealant was peeled off from the interface with the polyvinyl fluoride film laminated paper, whereas in the samples of the present invention 1 to 4, However, since the silicone material was destroyed, it was confirmed that the adhesive between the silicone material and the polyvinyl fluoride film was strong.

When the discharge voltage was as low as less than 5 kV as shown in Comparative Example 2, the adhesiveness was not improved because the corona discharge treatment was not sufficiently performed. Experimental example 2>

Next, Table 2 below shows the results of corona discharge treatment performed in the same manner as in Experimental Example 1 above, with the electrode voltage fixed at 14 kV and the frequency fixed at 4 OkHz, and with the electrode spacing varied.

[Table 2]

As is clear from Table 2, as in the present inventions 5, 6, and 7, the laminating paper subjected to the corona discharge treatment under the condition that the electrode interval is 5 mm or less, the silicone material is broken. From this, it was confirmed that the adhesiveness was good. On the other hand, in Comparative Example 3 As shown, the laminated paper treated under the condition that the electrode interval exceeded 5 mm did not improve the adhesiveness because the corona discharge treatment was not performed sufficiently. Industrial applicability

As described above, according to the present invention, one of the first and second electrodes arranged close to each other is covered with an insulating material, and both the first and second electrodes are A corona discharge generated by applying a high-frequency high voltage between the two electrodes is brought into contact with the processing surface of the object to be processed, and is disposed close to the processing surface of the object to be processed. Since corona discharge treatment is conventionally performed, corona discharge treatment can be efficiently performed even with a large, non-conductive and thick material, which has conventionally been difficult to perform corona discharge treatment.

In addition, the insulating material is formed in a roll shape, and the port is moved on the processing surface of the object to be processed so that the processing surface is sequentially reformed, so that the processing surface of the object is efficiently processed. Corona discharge treatment can be performed well.

Claims

The scope of the claims

One of the first and second electrodes arranged close to each other is covered with an insulating material, and both the first and second electrodes are close to the processing surface side of the object to be processed. The corona discharge generated by applying a high-frequency high voltage between the two electrodes is brought into contact with the treated surface of the workpiece to modify the treated surface. Surface treatment method.

The claim 1 is characterized in that the first and second electrodes are moved in conjunction with each other on the processing surface of the object to be processed, so that the surface of the object is subjected to corona discharge treatment. The surface treatment method described.

3. The surface treatment method according to claim 1, wherein an inter-electrode distance between the first electrode and the second electrode is set to 5 mm or less. A high frequency voltage of 5 kV or more and 25 kV or less having a frequency of 15 kHz or more and 50 kHz or less is applied between the first electrode and the second electrode. The surface treatment method according to any one of claims 1 to 3. The surface treatment method according to any one of claims 1 to 4, wherein the treated surface of the object is a resin or a resin-coated surface.

6. The surface treatment method according to claim 5, wherein the treated surface contains a fluororesin.

A first electrode that is covered with a roll-shaped insulating material and that is disposed close to the processing surface of the processing object, and that a predetermined distance is maintained between the processing surface of the processing object and the first electrode. And a high-voltage generator for applying a high-frequency high voltage between the first and second electrodes and generating a corona discharge between the two electrodes. Characteristic corona discharge treatment device.