JP5152784B2 - Bonding method - Google Patents

Description

The present invention relates to adhesive how to bond the fluorocarbon resin member made of a fluorocarbon resin to another member.

  In general, fluororesins have excellent properties not found in other resins, such as chemical resistance, heat resistance, electrical insulation, antifouling properties, weather resistance, UV resistance, water and oil repellency, and low friction coefficient. I have. Here, conventionally, for the purpose of protecting the surface of the metal member, the fluororesin member made of the fluororesin is formed into a sheet and adhered to the surface of the metal member. An adhesive has been used as means for bonding the fluororesin member to the metal member.

  However, when an adhesive is used, the affinity between the adhesive and the member is poor, resulting in problems such as low adhesive strength, uneven adhesion, and peeling of the members from each other.

  In addition, in order to increase the affinity between the adhesive and the member, the surface of the fluororesin member is modified by chemical treatment or the like, but since an adhesive is required, an adhesive layer (several tens of μm) exists. The problem of affecting the characteristics of the members remains.

Further, the surface modification by the conventional chemical treatment has a problem that the manufacturing process is complicated and long (chemical treatment, washing with water, drying, adhesive application, adhesion, etc. are required), and the apparatus becomes large.
JP 2006-294571 A

  By the way, if it is going to adhere | attach members without using an adhesive agent, you have to weld at the temperature of the melting | fusing point vicinity of a member or more. When the members are welded at that temperature, the composition of the members, the deformation of the shape, the discoloration, and the like may occur, and there is an inconvenience that the materials and applications of the usable members are limited.

  Further, in order to be able to bond members without using an adhesive, it is necessary to change the chemical or physical structure and composition of the members, which requires enormous time and cost. . Also, changing the chemical or physical structure and composition of each member also sacrifices the superior properties (eg, heat resistance, strength, insulation, etc.) of the member.

Accordingly, the present invention is a fluorocarbon resin member and other members, without using an adhesive and without changing the chemical or physical structure and composition of each member, bonding how that can be bonded to The purpose is to provide.

The invention according to claim 1 is an adhesion method in which a fluororesin member made of fluororesin is bonded to another member made of metal, glass resin or silicon resin without using an adhesive. there, the surface modification step of modifying the surface of the fluorine resin member by plasma, under normal temperature and normal pressure, the surface of the fluorine resin member that has been modified by the surface modification step, the other And a joining step of joining to the member without using the adhesive.

According to the first aspect of the present invention, in the surface modification step, the surface of the fluororesin member is modified by plasma. Next, in the joining process, the surface of the fluororesin member whose surface is modified at normal temperature and normal pressure does not intervene with other members made of any of metal, glass resin, or silicon resin. To be joined. Thereby, a fluororesin member adhere | attaches firmly on another member. As described above, according to the bonding method of the present invention, the fluororesin member and other members can be easily and reliably used without using an adhesive and without changing the chemical or physical structure and composition of each member. Can be glued.
Also, in the joining process, the composition of each member changes, the shape of each member changes, or each member changes color by joining the fluororesin member and other members at room temperature. Can be prevented.

  Next, the bonding method according to the first embodiment of the present invention will be described with reference to the drawings.

  First, an atmospheric pressure plasma processing apparatus for carrying out the surface modification step constituting the bonding method of this embodiment will be described. As shown in FIG. 1, the atmospheric pressure plasma processing apparatus 10 includes an application electrode 12. A ground electrode 14 is disposed at a position facing the application electrode 12. One or both of the application electrode 12 and the ground electrode 14 are covered with a dielectric. The ground electrode 14 is grounded to the ground.

  Further, on one end side of the ground electrode 14, a roll-shaped delivery device 16 that delivers a fluororesin sheet (fluororesin member) S between the application electrode 12 and the ground electrode 14 is disposed. Further, a roll-shaped winding device 64 for winding the surface-modified fluororesin sheet S is disposed on the other end side of the ground electrode 14.

  In addition, support rolls 20 and 22 that support the fluororesin sheet S from below are disposed near both ends of the ground electrode 14 so that wrinkles are not generated in the fluororesin sheet S. Thereby, the surface modification part of the fluororesin sheet | seat S becomes planar shape. The sending device 16 and the winding device 64 are connected to a driving source such as a motor (not shown). Thereby, the sending device 16 and the winding device 64 can be rotationally driven by the driving force from the driving source.

  Here, the fluororesin sheet S is preferably formed in a film shape or a sheet shape, but is not limited thereto. For example, the modified surface has a flat surface such as a plate shape, a tube shape, or a bulk shape. If it becomes, the thing of various shapes can be used. The fluororesin sheet S is not particularly limited as long as it contains a fluorine atom in the molecule. Specifically, polytetrafluoroethylene (PTFE), tetrafluoroethylene-ethylene copolymer (ETFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polyvinylidene fluoride (PVDF), polychlorotriethylene Examples include fluoroethylene (PCTFE).

  A high frequency power supply 26 is electrically connected to the application electrode 12 via a matching circuit 24. A high frequency voltage is applied between the application electrode 12 and the ground electrode 14 by the high frequency power source 26. A mixer 30 is connected to the application electrode 12 by a conduit 28.

  A first processing gas source 36 is connected to the mixer 30 via a gas flow rate measuring device 34 by a conduit 32. Further, a second processing gas source 44 is connected to the mixer 30 via a vaporizer 40 and a gas flow rate measuring device 42 by a conduit 38. An ethanol supply source 50 is connected to the vaporizer 40 via a solenoid valve 48 by a conduit 46.

Here, inside the first processing gas source 36 and the second processing gas source 44, noble gases such as helium (He), argon (Ar), and neon (Ne), nitrogen (N ₂ ), etc. Filled with inert gas. The first processing gas source 36 and the second processing gas source 44 may be filled with a single inert gas, or may be filled with a mixture of several types of inert gases. Although it is good, it is particularly preferable to be filled with helium (He) gas having a high surface modification effect.

Although the ethanol supply 50 ethanol _{(C 2} H 5 OH) is filled, it is not limited to ethanol _{(C 2} H 5 OH), for example, methanol _(CH 3 OH), such as the number of carbon atoms Any lower alcohol that is 4 or less primary alcohol or secondary alcohol may be used.

Next, the bonding method of the first embodiment will be described.
The adhesion method according to the first embodiment is a method in which the fluororesin sheet S and another member made of metal, silicon resin, or glass resin are firmly adhered. Hereinafter, as another member, a metal member will be described as an example and described in detail.

  As shown in FIG. 2, in the bonding process, a surface modification step of the fluororesin sheet S is executed (S100). The surface modification step is performed using the atmospheric pressure plasma processing apparatus 10 shown in FIG. That is, as shown in FIG. 1, the feeding device 16 and the winding device 64 are rotationally driven by driving from a driving source, and the fluororesin sheet S is fed between the application electrode 12 and the ground electrode 14. At this time, in the surface treatment part of the fluororesin sheet S positioned between the application electrode 12 and the ground electrode 14, the vicinity of the surface treatment part of the fluororesin sheet S is supported from below by the support rolls 20 and 22. Therefore, it is flat and has no wrinkles.

  Further, liquid ethanol is supplied from the ethanol supply source 50 to the vaporizer 40 through the conduit 46. Ethanol is vaporized by the vaporizer 40. In addition, an inert gas is supplied from the second processing gas supply source 44 to the vaporizer 40 through the conduit 38 at a predetermined flow rate. The ethanol gasified by the vaporizer 40 is bubbled by the inert gas supplied from the second processing gas supply source 44, and the bubbled gas is supplied to the mixer 30. At this time, the flow rate of the inert gas supplied from the second processing gas supply source 44 to the vaporizer 40 is measured by the gas flow rate measuring device 42, and the electromagnetic valve 48 is controlled based on the measured value. The flow rate of ethanol supplied from the ethanol supply source 50 to the vaporizer 40 is controlled. Thus, in the vaporizer 40, ethanol is vaporized, and the inert gas supplied from the second processing gas source 44 and the vaporized ethanol are mixed to form a mixed gas.

  Further, an inert gas having a predetermined flow rate is supplied from the first processing gas source 36 to the mixer 30 through the conduit 32. The inert gas supplied from the first processing gas source 36 acts as a carrier gas. In the mixer 30, the mixed gas obtained by mixing the inert gas supplied from the second processing gas source 44 and the vaporized ethanol and the inert gas supplied from the first processing gas source 36 are mixed. Is done. Thereby, in the mixer 30, dilution gas (processing gas) is produced | generated. Dilution gas (processing gas) generated in the mixer 30 is supplied between the application electrode 12 and the ground electrode 14 through the conduit 28.

  On the other hand, a high frequency voltage is applied from the high frequency power supply 26 between the application electrode 12 and the ground electrode 14. A high frequency (several hundred kHz to several tens of MHz) is used as the frequency at this time, and it is particularly preferable to set the frequency to 13.56 MHz, which is an industrial frequency. Further, the pressure between the application electrode 12 and the ground electrode 14 is a pressure (900 hPa or more and 1013 hPa or less) near atmospheric pressure (1013 hPa).

  If the pressure acting between the application electrode 12 and the ground electrode 14 is less than 900 hPa, a vacuum pump and a vacuum container are required, which increases the manufacturing cost of the equipment and the running cost of the equipment, which is a problem. Further, if the pressure acting between the application electrode 12 and the ground electrode 14 is greater than 1013 hPa, a pressure vessel or higher airtightness is required to prevent the processing gas from leaking to the outside, which is not preferable.

  When a dilution gas (processing gas) is supplied between the application electrode 12 and the ground electrode 14 and a high frequency voltage is applied, the dilution gas (processing gas) in the discharge space between the application electrode 12 and the ground electrode 14 is applied. ) Is ionized, plasma is generated, and the diluted gas (processing gas) is ionized and activated. Then, the plasma generated in the discharge space comes into contact with the surface of the fluororesin sheet S, so that the surface modification of the fluororesin sheet S is performed.

  More specifically, when ethanol is excited in plasma, -H, -OH, -O-, or the like is dissociated. The C—F bond on the fluororesin surface of the fluororesin sheet S is cleaved by —H dissociated from the alcohol because of the binding energy. -OH or -O- is attached to the dangling bond of C from which F has been cut, thereby imparting hydrophilicity to the fluororesin on the surface. Thereby, the fluororesin surface of the fluororesin sheet S can be modified.

  When a higher alcohol having a relatively large number of carbon atoms is used, when the alcohol is excited in plasma, the viscosity becomes too high to vaporize or form a cluster, which makes excitation very difficult. Also, when a polyhydric alcohol is used, excitation becomes difficult because of high viscosity. Furthermore, when a tertiary alcohol is used, the tertiary functional group is not oxidized, so that the hydrophilic functional group cannot be dissociated. As described above, by using ethanol, the fluororesin surface of the fluororesin sheet S can be conveniently modified.

  As described above, the fluororesin sheet S subjected to surface modification (plasma treatment) using each atmospheric pressure plasma processing apparatus 10 is wound up by the winding apparatus 64.

  Next, the joining process shown in FIG. 2 is performed (S200). In addition, it is preferable to clean the surface of the metal member (other member) M, which is another member to be bonded, to remove dust, dust, and the like before the joining step. In this joining step, as shown in FIG. 3, the fluororesin sheet S whose surface has been modified by plasma is joined to the metal member M. In this joining method, the operator may attach the two together by hand, or the metal member M is moved by a belt conveyor or the like so that the fluororesin sheet S and the metal member M are joined using a roller. Also good. Moreover, as conditions at the time of joining, both are joined under normal temperature and a normal pressure. Here, normal temperature means a range of 15 ° C. to 25 ° C., for example. Thereby, the fluororesin sheet S and the metal member M are firmly bonded. In addition, the member used as the joining object of the fluororesin sheet | seat S produces strong adhesive force also by using the member comprised by glass resin or silicon resin other than the metal member M. FIG.

  Further, as a condition at the time of joining, when at least one of the fluororesin sheet S or the metal member M is pressurized and joined in a state in which a predetermined pressure acts between them (normal temperature and pressure conditions), Adhesive strength is improved and the adhesive is more firmly bonded.

  As described above, according to the bonding method of the present embodiment, the surface of the fluororesin sheet S is modified using the atmospheric pressure plasma processing apparatus 10 and then the fluororesin sheet S and the metal member M are joined. Thus, the fluororesin sheet S and the metal member M can be easily and reliably bonded without using an adhesive.

  In particular, since the fluororesin sheet S and the metal member M are bonded by being bonded at room temperature, the chemical or physical structure and composition of each member can be prevented from changing.

  Moreover, since there is no adhesive layer between the fluororesin sheet S and the metal member M, the characteristics of the fluororesin sheet S are not affected. Furthermore, since uniform surface modification is performed using the atmospheric pressure plasma processing apparatus 10, it is possible to prevent unevenness in the adhesive strength of the fluororesin sheet S.

  In particular, the use of ethanol for the generation of the processing gas of the atmospheric pressure plasma processing apparatuses 10A and 10B is not harmful and can prevent adverse effects on the environment. In addition, since ethanol is not harmful, no special equipment considering the toxicity is required to handle ethanol. In addition, since ethanol is not harmful, special equipment for treating ethanol with waste liquid is not required. As described above, according to the present invention, it is possible to prevent adverse effects on the environment, and to significantly reduce the manufacturing cost for manufacturing the equipment and the running cost for operating the equipment. In particular, the safety can be most improved by using ethanol as the alcohol.

  Furthermore, since the fluororesin sheet S is supported by the support rolls 20 and 22, the surface treatment portion of the fluororesin sheet S becomes planar. By making the surface treatment part of the fluororesin sheet S flat, plasma can be irradiated to the surface treatment part of the fluororesin sheet S without any spots, and the quality of surface modification can be greatly improved. As a result, the adhesive force between the fluororesin sheet S and the metal member M is not spotted, and the adhesive strength between them can be improved.

It is a block diagram of the atmospheric pressure plasma processing apparatus for performing the surface modification process of the adhesion | attachment method which concerns on 1st Embodiment of this invention. It is process drawing which showed each process of the adhesion | attachment method which concerns on 1st Embodiment of this invention. It is the perspective view which showed the adhesion state of the fluororesin member and metal member which were adhere | attached by the adhesion | attachment method which concerns on 1st Embodiment of this invention.

Explanation of symbols

10 Atmospheric pressure plasma processing equipment S Fluororesin sheet (Fluororesin member)
M metal member (other members)

Claims (1)

An adhesion method for adhering a fluororesin member made of fluororesin to another member made of metal, glass resin or silicon resin without using an adhesive,
A surface modification step of modifying the surface of the fluororesin member with plasma;
A bonding step of bonding the surface of the fluororesin member modified in the surface modification step to the other member without using the adhesive under normal temperature and normal pressure ;
A bonding method characterized by comprising:

Images