WO2018216804A1 - Resin molded article bonding method - Google Patents

Resin molded article bonding method Download PDF

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Publication number
WO2018216804A1
WO2018216804A1 PCT/JP2018/020186 JP2018020186W WO2018216804A1 WO 2018216804 A1 WO2018216804 A1 WO 2018216804A1 JP 2018020186 W JP2018020186 W JP 2018020186W WO 2018216804 A1 WO2018216804 A1 WO 2018216804A1
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Prior art keywords
molded product
resin
resin composition
ultraviolet light
irradiation
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PCT/JP2018/020186
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French (fr)
Japanese (ja)
Inventor
晋一 廣田
光宏 権田
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ポリプラスチックス株式会社
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Priority to JP2019520330A priority Critical patent/JPWO2018216804A1/en
Publication of WO2018216804A1 publication Critical patent/WO2018216804A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams

Definitions

  • the present invention relates to a method for joining resin molded products in which laser welding is performed after irradiation with ultraviolet light.
  • resin molded products obtained by injection molding of thermoplastic resins have been used in various fields such as automobile parts, electrical / electronic equipment parts, and daily necessities.
  • Such a resin molded product may be used as a composite molded product in which a plurality of resin molded products are joined to each other for the purpose of forming a three-dimensional hollow body and simplifying a process during component assembly.
  • Patent Documents 2-5 and Non-Patent Document 1 there is provided a technique for processing and bonding resin molded products with vacuum ultraviolet light (VUV) (see Patent Documents 2-5 and Non-Patent Document 1). According to this technique, it takes several minutes to several tens of minutes to join the resin molded product, but the deformation of the joined resin molded product is small.
  • Patent Documents 2 and 3 and Non-Patent Document 1 assume that the resin molded article is made of an amorphous resin such as polymethyl methacrylate (PMMA) resin or cyclic olefin resin, and the bonding strength is 1 MPa or less.
  • Patent Documents 4 and 5 assume silicone adhesion.
  • the double molding (molding) technology that forms a final resin molded product by first molding a resin molded product with the resin composition and then secondary molding the resin molded product together with the resin composition.
  • Resin molded products combining materials of different properties and materials of different colors are integrally molded by the double molding technology and used in various products.
  • the portion to be joined is mechanically reinforced, such as by providing an anchor such as a through hole or an undercut.
  • the primary molding product is inserted into the mold and then subjected to the secondary molding process, so it is necessary to design the shape in consideration of installation in the mold and mold release.
  • thermoplastic crystalline resins such as polybutylene terephthalate (PBT) resin and polyphenylene sulfide (PPS) resin that have robust and stable properties.
  • PBT polybutylene terephthalate
  • PPS polyphenylene sulfide
  • the present invention is proposed in view of the above-described circumstances, and is a composite in which high bonding strength can be obtained for a resin molded product produced using a resin composition while suppressing deformation of the resin molded product. It is an object of the present invention to provide a joining method for producing a molded product with high productivity and high degree of freedom in shape.
  • the joining method of the resin molded product according to the present invention is a joining method of joining a resin molded product made of a resin composition, and absorbs the first molded product made of a resin composition that transmits laser light and / or laser light.
  • the second molded product made of the resin composition is irradiated with ultraviolet light in the region where bonding is planned, and arranged so that the region of the second molded product is in contact with the region of the first molded product,
  • the laser beam is irradiated from the first molded product side, the laser beam transmitted through the first molded product is absorbed in the region of the second molded product, and the respective interfaces of the first molded product and the second molded product are in contact with each other.
  • the heating and melting by the laser beam at the interface where the regions of the first molded product and the second molded product contact each other may include stirring the resin composition constituting the first molded product and the second molded product at the interface.
  • the resin composition may include a thermoplastic crystalline resin.
  • the ultraviolet light may be vacuum ultraviolet light.
  • the resin composition constituting the first molded product and the second molded product may have a melt viscosity of 300 Pa ⁇ s or less measured at a melting point of the resin + 30 ° C. and 1000 sec ⁇ 1 .
  • the resin composition which forms a 1st molded product and a 2nd molded product may be the same, and may differ.
  • the composite molded product produced by laser welding has a high bonding strength.
  • the resin compositions constituting the plurality of resin molded products before being joined are different materials, they have high joining strength, small deformation, productivity and flexibility in shape. An excellent composite molded product can be produced.
  • thermoplastic resin composition consists of a composition containing a thermoplastic crystalline resin and / or a thermoplastic amorphous resin.
  • thermoplastic crystalline resin for example, polyoxymethylene (POM), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), or liquid crystal polymer (LCP) may be used.
  • thermoplastic amorphous resin for example, polycarbonate (PC), cyclic polyolefin (COP), and cyclic polyolefin copolymer (COC) may be used.
  • PC polycarbonate
  • COP cyclic polyolefin
  • COC cyclic polyolefin copolymer
  • Thermoplastic crystalline resins are generally opaque, but may be translucent or transparent for resins with low crystallinity.
  • thermoplastic resin composition includes various fillers such as glass fibers, antioxidants and stabilizers, nucleating agents, lubricants, plasticizers, mold release agents, and colorants, which are generally added to the resin composition. You may add an additive in the range which does not impair the laser transmittance of a 1st molded article notably.
  • the viscosity of the thermoplastic resin composition can be appropriately selected within the range where the required moldability can be obtained according to the thickness of the resin molded product to be obtained. However, the resin can easily be mixed at the joining interface of laser welding. From this viewpoint, the melt viscosity of the thermoplastic resin composition is preferably low, and the melt viscosity at 1000 sec ⁇ 1 measured at melting point + 30 ° C.
  • the lower limit of the melt viscosity is not particularly limited, but when it is extremely low, there is a concern that the physical properties are lowered due to the molecular weight of the resin being too low, and thus it is preferably 5 Pa ⁇ s or more.
  • the first molded product and the second molded product produced by injection molding of the resin composition are arranged so that the respective planned joining regions (surfaces irradiated with vacuum ultraviolet light) are in contact with each other,
  • a laser beam is irradiated from the side of the first molded product made of a resin composition that transmits laser light toward the region to be joined, and the second molded product made of a resin composition that absorbs laser light in the region to be joined.
  • the light is absorbed to generate heat at the interface between the first molded product and the second molded product to be joined, and are then solidified by cooling after heating and melting, thereby joining them together.
  • the region to be joined of the first molded product and the second molded product includes opposing surfaces whose surfaces can contact each other.
  • the opposed surface of the second molded product and the opposed surface of the first molded product are in close contact with each other, the melted interface is efficiently welded, so these opposed surfaces have corresponding shapes. ing.
  • the opposing surface of the first molded product is substantially flat, the opposing surface of the second molded product is also substantially flat corresponding thereto.
  • the facing surface may be a surface having irregularities.
  • the opposing surface of the first molded product is an uneven shape
  • the opposing surface of the second molded product also has an uneven shape corresponding thereto.
  • FIG. 1 is a diagram schematically illustrating a series of steps of the present embodiment.
  • Figure 1 (a) the first molded product 10 1 and providing a second molded article 10 2, a first molded article with ultraviolet light irradiation device 20 10 1 of the irradiated surface 10 1 a and the second irradiating ultraviolet light (UV) to the irradiated surface 10 2 a of the molded product 10 2.
  • 1 and a radiation surface 10 of the first molded product 10 1, and the second molded product 10 second irradiation surface 10 2 a, an area (opposing surface) of the bonding is scheduled together.
  • ultraviolet light refers to light having a wavelength of 380 nm or less.
  • ultraviolet light having a wavelength of 200 nm or less is called vacuum ultraviolet light (VUV).
  • VUV vacuum ultraviolet light
  • vacuum ultraviolet light does not necessarily have to be irradiated in a vacuum, but ultraviolet light in the wavelength region is largely absorbed by air, so when irradiated in air, the distance that the vacuum ultraviolet light propagates Need to be shortened. Since it is advantageous to use a shorter ultraviolet wavelength from the viewpoint of bonding strength, it is preferable to use vacuum ultraviolet light. However, since vacuum ultraviolet light with a shorter wavelength may cause deterioration of the resin due to irradiation, vacuum ultraviolet light is used. Whether or not light is used may be appropriately adjusted according to the type of resin used.
  • an ultraviolet light irradiation device 20 is a vacuum ultraviolet light irradiation device having a light source 21 such as an Xe excimer lamp and a reflection plate 22 that reflects light emitted from the light source 21 toward an irradiation object.
  • FIG. 2 is a photograph showing an example of a vacuum ultraviolet light irradiation apparatus.
  • the vacuum ultraviolet light irradiation device shown in this photograph can irradiate ultraviolet light from the opening formed on the upper surface of the housing toward the upper part.
  • the ultraviolet light irradiation device 20 and the ultraviolet light may be described as the vacuum ultraviolet light irradiation device 20 and the vacuum ultraviolet light.
  • first molded product 10 1 has a generally flat illumination surface 10 1 a
  • the second molded product 10 2 has a substantially flat illumination surface 10 2 a.
  • the irradiation time of the first molded product 10 1 and the second molded product 10 ultraviolet light to 2 can be set as appropriate in consideration of the illuminance on the irradiated surface.
  • the irradiation time may be, for example, 7 minutes, but is not limited to 7 minutes, and is 0 minutes. It may be longer than 15 minutes.
  • the time of 30 seconds or more and 10 minutes or less may be sufficient.
  • the rather bonding strength may be lowered, the 1 irradiation of the ultraviolet light to the molded article 10 1 and the second molded product 10 2 is preferably within a predetermined time.
  • the illuminance changes depending on the irradiation distance (distance from the light source to the irradiation surface), the output of the irradiation device, etc., so the irradiation condition of the ultraviolet light is based on the irradiation energy amount obtained from the product of the illuminance and the irradiation time. You may decide.
  • the irradiation energy amount may be at 0.1 J / cm 2 or more 10J / cm 2 or less, also 0.5 J / cm 2 or more 6J / cm 2 or less (e.g., 1 J / cm 2 or more 3J / cm 2 or less) It may be.
  • the irradiation time can be shortened, so that processing in a shorter time becomes possible.
  • the irradiation of ultraviolet light not must be both the first molded product 10 1 and the second molded product 10 2, first forming 10 1 or the second molded product 10 2 either to only one May be irradiated.
  • the operation of placing the first molded product 10 1 and the second molded product 10 2, first forming 10 1 and the second molded product 10 2 to ultraviolet light ( It is desirable to carry out in as short a time as possible after finishing the step of irradiating (vacuum ultraviolet light) (see FIG. 1A).
  • the time is, for example, preferably within 10 days, more preferably within 1 day, even more preferably within 2 hours, particularly preferably within 30 minutes, and most preferably within 5 minutes.
  • a laser beam irradiation apparatus 30 irradiates a laser beam from the first molded product 10 1 side, the laser beam transmitted through the first molded product 10 1 second forming 10 by being absorbed into 2, and heating the interface of the irradiated surface 10 1 a and the irradiation surface 10 2 a is, the resin composition constituting the first molded product 10 1 and the second molded product 10 2 is heated and melted.
  • the laser beam 200 emitted from the laser beam irradiation device 30 is focused so that the focusing point 201 is positioned in the vicinity of the interface between the irradiated surface 10 1 a and the irradiated surface 10 2 a.
  • the resin composition is melted at the laser light condensing point 201 located in the vicinity of the interface between the irradiated surface 10 1 a and the irradiated surface 10 2 a to form the melted portion 12.
  • the melting section 12 by receiving the energy of the further laser beam while the resin composition is melted, the molten metal flow (stirring) 12a is generated at the interface, the first molded product 10 1 and the second molded product 10 2
  • the respective resin compositions are mixed together.
  • the compatibility of the resin composition constituting the first molded product 10 1 and the second molded product 10 2 is resin composition
  • the resin composition phase-separates in the process of cooling and solidification in ordinary laser welding, and sufficient bonding properties cannot be obtained.
  • the irradiation of the pre-ultraviolet light if the first molded product 10 1 and the second molded product 10 second surface if activated, the compatibility of the resin composition constituting each Even if it is low, it cools and solidifies, maintaining the state where the interface was mixed.
  • the first molded product 10 1 and the second molded product 10 2 are joined integrally, so constituting a single composite molded article (e.g., three-dimensional hollow bodies). Even in the case of a combination of highly compatible resin compositions, if irradiation with ultraviolet light is performed as in this embodiment, mixing of the resin at the interface is promoted, and ultraviolet light is emitted. Even better bondability can be obtained compared to the case of no irradiation.
  • the first molded product 10 1 and the bonding between the second molded product 10 2, the processing layer 11 second treatment layer 11 1 and the second molded product 10 2 of first molded product 10 1 is activated by the vacuum ultraviolet light It is heated and melted and stirred by the energy of the laser beam. Therefore, the connection of the first molded product 10 1 and the second molded product 10 2 are mechanically robust, which is chemically stable.
  • the processing layer 11 1 and the processing layer 11 2 is formed on the first molded article 10 1 and the second molded product 10 2, melting and stirring only treatment layer 11 1 and the processing layer 11 2 by laser welding to the first molded product 10 1 is intended to connect the second molded product 10 2. Therefore, excessive heat, pressure, vibration, etc. are not applied to the entire molded product, so that deformation and burring due to bonding can be suppressed, and even when components are housed inside, they can be damaged. Nor.
  • thermoplastic resin composition containing a thermoplastic crystalline resin and / or a thermoplastic amorphous resin can be used as the resin composition.
  • Thermoplastic crystalline resins include polyoxymethylene (POM), polybutylene terephthalate (PBT) resin, polyethylene terephthalate (PET) resin, polyphenylene sulfide (PPS) resin, and liquid crystal polymer (LCP), which have robust and stable properties.
  • thermoplastic crystalline resins can be used
  • thermoplastic amorphous resins include thermoplastic amorphous resins such as polycarbonate (PC), cyclic polyolefin (COP), and cyclic polyolefin copolymer (COC). Resin can be used.
  • the thermoplastic crystalline resin can be used for producing a resin molded product that requires mechanical strength, heat resistance, and chemical resistance.
  • FIG. 3 shows the shape of the composite molded product.
  • the first molded product 10 1 of the irradiated surface 10 1 a and the second irradiated surface 10 2 a of the molded product 10 2 By irradiation with vacuum ultraviolet light, the first molded product 10 1 of the irradiated surface 10 1 a and the second irradiated surface 10 2 a of the molded product 10 2, to a predetermined depth from the irradiated surface 10 1 a and the irradiation surface 10 2 a treatment layer 11 1 and the processing layer 11 2 that property changes of the resin composition is formed.
  • first molded product 10 1 of the irradiated surface 10 1 a and the second molded product 10 second irradiation surface 10 2 a from each other 10 in contact with an area of ⁇ 10 mm it was first molded article 10 1 and be overlapped portion of the predetermined distance from the second molded product 10 2 each longitudinal end disposed.
  • the laser beam from the first molded product 10 1 side (wavelength 940 nm, output 24W, a beam diameter 1.6 mm, the scanning speed of 20 mm / sec) and, in the longitudinal direction of the composite molded article irradiated so as to scan in a perpendicular direction against the first molded product 10 1 and the second molded product 10 2 laser welding to form a molten part 12 in the region of 1.6 mm ⁇ 6 mm, to prepare a composite molded article .
  • Example 1 First molded article: PBT DURANEX (registered trademark) 2002 manufactured by Wintech Polymer Co., Ltd. (unreinforced PBT resin composition, melt viscosity at 250 ° C., 1000 sec ⁇ 1 at 260 Pa ⁇ s) Second molded product: PPS Durafide (registered trademark) 1130A1 manufactured by Polyplastics Co., Ltd. (PPS resin composition reinforced with 30% by mass of glass fiber, melt viscosity 350 Pa ⁇ s at 310 ° C.
  • PPS Durafide registered trademark
  • Example 2 First molded article: PBT DURANEX (registered trademark) 2002 manufactured by Wintech Polymer Co., Ltd. (unreinforced PBT resin composition, melt viscosity at 250 ° C., 1000 sec ⁇ 1 at 260 Pa ⁇ s) Second molded article: PPS Durafide (registered trademark) 1130A6 manufactured by Polyplastics Co., Ltd. (PPS resin composition reinforced with 30% by mass of glass fiber, melt viscosity 220 Pa ⁇ s at 310 ° C. and 1000 sec ⁇ 1 )
  • Example 3 the same operation as in Example 1 was also performed except that the irradiation with vacuum ultraviolet light was not performed before laser welding. Moreover, it evaluated also about joining of the same material as a combination of a highly compatible resin composition. Specifically, as Example 3, PBT DURANEX (registered trademark) 2002 (unreinforced PBT resin composition, 250 ° C., 1000 sec ⁇ 1 ) manufactured by Wintech Polymer Co., Ltd. was used for both the first molded product and the second molded product. In the same manner as in Example 3 except that irradiation with vacuum ultraviolet light was not performed before laser welding as Comparative Example 2 except that the melt viscosity at 260 Pa ⁇ s) was used. The operation was also evaluated.
  • PBT DURANEX registered trademark
  • the composite molded product produced as described above was subjected to a tensile test at 5 mm / min using a tensile tester (manufactured by Shimadzu Corporation, Autograph AG-20kNXDplus), and the tensile shear strength was measured.
  • a tensile tester manufactured by Shimadzu Corporation, Autograph AG-20kNXDplus
  • the tensile shear strength was measured.
  • the composite molded product of Example 2 was 18.5 MPa
  • Comparative Example 1 was 0 MPa (not joined).
  • it was 32.0 MPa in the composite molded product of Example 3 whereas it was 28.2 MPa in Comparative Example 2.
  • Example 1 in ordinary laser welding without irradiation with ultraviolet light, it was not possible to join a PBT resin composition and a PPS resin composition, which are different materials having low compatibility, but ultraviolet light.
  • Example 2 in which laser welding was performed after irradiation, sufficient joint strength was obtained in a composite molded product in which resin molded products of different materials were joined.
  • Example 2 the joint strength higher than Example 1 is obtained, and it turns out that the one where the melt viscosity of a resin composition is low becomes advantageous in terms of joint strength. This is thought to be due to the ease of hot water flow (stirring) at the melted interface.
  • a higher bonding strength was obtained by performing pretreatment by ultraviolet light irradiation.
  • Example 4 the combination of the resin compositions was changed to the following, and the same operation as in Example 1 was performed except that the laser beam output at the time of welding was changed to 30 W. Evaluation was also performed.
  • First molded article PBT DURANEX (registered trademark) 2002 manufactured by Wintech Polymer Co., Ltd. (unreinforced PBT resin composition, melt viscosity at 250 ° C., 1000 sec ⁇ 1 at 260 Pa ⁇ s)
  • Second molded product PPS Durafide (registered trademark) 0220A9 manufactured by Polyplastics Co., Ltd. (non-reinforced PPS resin composition, melt viscosity of 500 Pa ⁇ s at 310 ° C. and 1000 sec ⁇ 1 )
  • Example 5 was the same as Example 4 except that ultraviolet light having a wavelength of 254 nm was irradiated for 7 minutes at an illuminance of 6 mW / cm 2 instead of vacuum ultraviolet light.
  • evaluation was also performed on the same operation as in Example 4 except that the irradiation with vacuum ultraviolet light was not performed before laser welding.
  • the composite molded product produced as described above was subjected to a tensile test at 5 mm / min using a tensile tester (manufactured by Shimadzu Corporation, Autograph AG-20kNXDplus), and the tensile shear strength was measured.
  • a tensile tester manufactured by Shimadzu Corporation, Autograph AG-20kNXDplus
  • Example 5 it was 11.0 MPa
  • Comparative Example 3 it was 9.8 MPa, and it was confirmed that the bonding strength of laser welding was increased by irradiating ultraviolet light, particularly vacuum ultraviolet light, as pretreatment. .
  • both the first molded product and the second molded product were PBT DURANEX (registered trademark) 2002 (unreinforced PBT resin composition, 250 ° C., 1000 sec ⁇ 1 ) manufactured by Wintech Polymer Co., Ltd.
  • Example 6 was carried out in the same manner as in Example 4, Example 5 and Comparative Example 3, except that a combination of the same materials having a viscosity of 260 Pa ⁇ s) was used and the output of the laser beam during welding was 24 W.
  • Example 7 As a result of evaluating Example 7 and Comparative Example 4, the tensile shear strength was 27.2 MPa in Example 6 irradiated with vacuum ultraviolet light, 15.7 MPa in Example 7 irradiated with ultraviolet light, and (vacuum) ultraviolet.
  • the comparative example 4 which did not irradiate light is 10.1 MPa, and similarly to the tendency in the example 4, the example 5 and the comparative example 3 in which the joining with the different materials was performed, the ultraviolet light as the pretreatment, particularly Irradiate vacuum ultraviolet light And, the bonding strength of the laser welding that increases was confirmed.

Abstract

A method for bonding resin molded articles made of a resin composition comprises: arranging, after an irradiation surface (101a) and/or an irradiation surface (102a) that are planned to be bonded of a first molded article (101) that transmits laser light and/or a second molded article (102) that absorbs laser light are irradiated with vacuum ultraviolet light, the first molded article (101) and the second molded article (102) in such a way that the irradiation surface (101a) and the irradiation surface (102a) contact each other; and irradiating the laser light from the first molded article (101) side and causing the laser light that has passed through the first molded article (101) to be absorbed in the irradiation surface (102a) of the second molded article (102) to achieve heating/melting for laser welding.

Description

樹脂成形品の接合方法Bonding method of resin molded products
　本発明は、紫外光を照射してからレーザー溶着を行う樹脂成形品の接合方法に関する。 The present invention relates to a method for joining resin molded products in which laser welding is performed after irradiation with ultraviolet light.
　従来、自動車部品、電機・電子機器部品、日用品など様々な分野において、熱可塑性樹脂を射出成形してなる樹脂成形品が用いられている。このような樹脂成形品は、三次元中空体の形成や部品組立時の工程簡略化といった目的で、複数の樹脂成形品が、互いに接合されて構成された複合成形品として用いられる場合がある。 Conventionally, resin molded products obtained by injection molding of thermoplastic resins have been used in various fields such as automobile parts, electrical / electronic equipment parts, and daily necessities. Such a resin molded product may be used as a composite molded product in which a plurality of resin molded products are joined to each other for the purpose of forming a three-dimensional hollow body and simplifying a process during component assembly.
　樹脂成形品を接合するためには、接着剤や熱溶着など、各種の接合技術が提供されている。ただし、樹脂成形品を接着剤で接合する技術は、樹脂成形品を変形させることなく接合することができるが、一般的に接着剤の硬化には数時間かかるため生産性に劣る上、流路部品のような微細な中空部を有する三次元中空体においては、接着剤が中空部に漏出して溝が埋没するといった問題があった。そして、樹脂成形品を熱溶着する技術は、数分で接合することが可能であるが、熱板溶着や振動溶着、超音波溶着のような溶着技術では接合した樹脂成形品にバリや熱変形が発生したり、内部に収納する部品に損傷を与えたりすることがあった。なお、特許文献１のようなレーザー溶着を用いれば、バリや変形、内部の部品への影響は抑えられるものの、これらの熱溶着技術は、接合対象の樹脂成形品の表面同士を溶融させて相溶した状態で固化させるものであるため、化学的に親和性（相溶性）の高い樹脂からなる成形品同士、すなわち基本的に同材同士の接合に限られるという問題があった。 In order to join resin molded products, various joining techniques such as adhesives and heat welding are provided. However, the technology for bonding resin molded products with adhesives can bond the resin molded products without deforming them, but generally it takes several hours to cure the adhesive, and the productivity is inferior. In a three-dimensional hollow body having a fine hollow portion such as a part, there is a problem that the adhesive leaks into the hollow portion and the groove is buried. The technology for heat-welding resin molded products can be joined in a few minutes. However, welding technologies such as hot plate welding, vibration welding, and ultrasonic welding can cause burrs and thermal deformation to the joined resin molded products. May occur, or the parts housed inside may be damaged. Although the use of laser welding as in Patent Document 1 can suppress the effects of burrs, deformations, and internal components, these thermal welding techniques are performed by melting the surfaces of the resin molded products to be joined together. Since it is made to solidify in the melted state, there is a problem that it is limited to joining of molded products made of resins having high chemical affinity (compatibility), that is, basically the same material.
　また、真空紫外光（ＶＵＶ）により樹脂成形品を処理して接合する技術が提供されている（特許文献２－５、非特許文献１を参照）。この技術によると、樹脂成形品の接合に数分から数十分程度の時間を要するが、接合した樹脂成形品の変形は小さい。ただし、特許文献２、３、非特許文献１は、樹脂成形品にポリメタクリル酸メチル（ＰＭＭＡ）樹脂や環状オレフィン樹脂等の非晶性樹脂でなるものを想定し、接合強度は１ＭＰａ以下である。特許文献４、５は、シリコーン接着を想定している。 In addition, there is provided a technique for processing and bonding resin molded products with vacuum ultraviolet light (VUV) (see Patent Documents 2-5 and Non-Patent Document 1). According to this technique, it takes several minutes to several tens of minutes to join the resin molded product, but the deformation of the joined resin molded product is small. However, Patent Documents 2 and 3 and Non-Patent Document 1 assume that the resin molded article is made of an amorphous resin such as polymethyl methacrylate (PMMA) resin or cyclic olefin resin, and the bonding strength is 1 MPa or less. . Patent Documents 4 and 5 assume silicone adhesion.
　さらに、樹脂組成物により樹脂成形品を一次成形し、この樹脂成形品に樹脂組成物を併せて二次成形することにより最終的な樹脂成形品を作製する二重成形（double shot molding）の技術が提供されている。二重成形の技術によって、異なる性質の材料や異なる色の材料を組み合わせた樹脂成形品が一体に成形され、多様な製品に利用されている。しかし、二重成形においては、二次成形により樹脂を接合する部分の強度を確保するため、接合する部分に貫通穴やアンダーカット等のアンカーを設けるなど機械的に補強することがあった。また、二重成形では、一次成形品を金型にインサートしてから二次成形を行うという工程を踏むため、金型内への設置や離型を考慮した形状設計を行う必要があり、形状自由度に劣るという問題があった。さらに、複合成形品の内部に電子部品等を収容して二重成形を行う場合、それらの部品を一次成形品とともに金型内に配置して二次成形を行うが、二次成形時の熱や圧力によっては内部に収容される部品が損傷する可能性があることから、接合技術として二重成形を適用できない場合があった。 In addition, the double molding (molding) technology that forms a final resin molded product by first molding a resin molded product with the resin composition and then secondary molding the resin molded product together with the resin composition. Is provided. Resin molded products combining materials of different properties and materials of different colors are integrally molded by the double molding technology and used in various products. However, in the double molding, in order to secure the strength of the portion where the resin is joined by the secondary molding, there are cases where the portion to be joined is mechanically reinforced, such as by providing an anchor such as a through hole or an undercut. In addition, in double molding, the primary molding product is inserted into the mold and then subjected to the secondary molding process, so it is necessary to design the shape in consideration of installation in the mold and mold release. There was a problem that the degree of freedom was inferior. Furthermore, when carrying out double molding by storing electronic components etc. inside the composite molded product, these components are placed in the mold together with the primary molded product, and the secondary molding is performed. Depending on the pressure and pressure, there is a possibility that the components housed inside may be damaged, and there are cases where double molding cannot be applied as a joining technique.
特表平９－５１０９３０号公報Japanese National Patent Publication No. 9-510930 特開２００６－１８７７３０号公報JP 2006-187730 A 特開２００９－１７３８９４号公報JP 2009-173894 A 特開２０１１－１４８１０４号公報JP 2011-148104 A 特開２０１３－１４７０１８号公報JP 2013-147018 A
　一方、機械的強度や耐熱性、耐薬品性が要求される成形品には、堅牢で安定した性質を有するポリブチレンテレフタレート（ＰＢＴ）樹脂やポリフェニレンサルファイド（ＰＰＳ）樹脂のような熱可塑性結晶性樹脂を利用することができる。また、樹脂組成物でなる樹脂成形品を接合することにより複合成形品を作製する際には、接合による樹脂成形品の変形が小さく、高い接合強度を有する複合成形品を、生産性よく製造できることが求められる。 On the other hand, for molded products that require mechanical strength, heat resistance, and chemical resistance, thermoplastic crystalline resins such as polybutylene terephthalate (PBT) resin and polyphenylene sulfide (PPS) resin that have robust and stable properties. Can be used. In addition, when producing a composite molded product by joining resin molded products made of a resin composition, deformation of the resin molded product due to bonding is small, and a composite molded product having high joint strength can be manufactured with high productivity. Is required.
　前述の真空紫外光で樹脂成形品を処理して接合する技術は、樹脂成形品の変形を小さく抑えることができたが、非晶性樹脂でなる樹脂成形品の接合やシリコーン接着剤の硬化を想定したものであり、また十分な接合強度を確保することもできなかった。 Although the technology for processing and bonding resin molded products with vacuum ultraviolet light as described above has been able to suppress deformation of the resin molded products to a small extent, it is possible to bond resin molded products made of amorphous resin and cure silicone adhesives. It was assumed and sufficient bonding strength could not be secured.
　一方、樹脂組成物を二重成形により接合する場合には、一次成形品の樹脂を溶融させるために多くの熱量を要し、十分な溶着状態が得られずに接合強度が確保できないことがあった。特に一次成形品に結晶性熱可塑性樹脂組成物を用いる場合、結晶化した樹脂を溶融させるには、より多くの熱量を必要とする。また、相溶性の低い樹脂同士を接合するためには、接合強度を高めるためにアンカーのような物理的構造による補強を行う必要があり、当然ながら樹脂成形品にそのような補強構造を設けるためのスペースを確保する必要があることから、設計上の制約が生じ、形状の自由度が低下する問題があった。そして熱溶着による接合においては、樹脂成形品の表層部のみを溶融させて接合する技術であることから、物理的なアンカーによる補強はそもそも困難であり、相溶性の低い樹脂同士の接合は困難であることは前述の通りである。 On the other hand, when the resin composition is bonded by double molding, a large amount of heat is required to melt the resin of the primary molded product, and a sufficient welded state cannot be obtained, and the bonding strength may not be ensured. It was. In particular, when a crystalline thermoplastic resin composition is used for a primary molded product, a larger amount of heat is required to melt the crystallized resin. In addition, in order to join resins having low compatibility, it is necessary to reinforce with a physical structure such as an anchor in order to increase the joining strength. Of course, in order to provide such a reinforcing structure in a resin molded product Therefore, there is a problem that design restrictions are imposed and the degree of freedom in shape is reduced. And in joining by thermal welding, since it is a technology to melt and join only the surface layer part of the resin molded product, reinforcement by physical anchors is difficult in the first place, and joining of resins with low compatibility is difficult It is as described above.
　本発明は、上述の実情に鑑みて提案されるものであって、樹脂組成物を用いて作製した樹脂成形品について、樹脂成形品の変形を小さく抑えつつ、高い接合強度が得られるような複合成形品を、生産性よく、かつ高い形状自由度で製造するための接合方法を提供することを目的とする。 The present invention is proposed in view of the above-described circumstances, and is a composite in which high bonding strength can be obtained for a resin molded product produced using a resin composition while suppressing deformation of the resin molded product. It is an object of the present invention to provide a joining method for producing a molded product with high productivity and high degree of freedom in shape.
　本発明に係る樹脂成形品の接合方法は、樹脂組成物からなる樹脂成形品を接合する接合方法であって、レーザー光を透過する樹脂組成物からなる第１成形品及び／又はレーザー光を吸収する樹脂組成物からなる第２成形品の、接合が予定される領域に紫外光を照射し、前記第１成形品の前記領域に第２成形品の前記領域が接するように配置した上で、第１成形品側からレーザー光を照射して、第１成形品を透過したレーザー光を第２成形品の前記領域において吸収させ、第１成形品及び第２成形品それぞれの前記領域が接する界面を加熱溶融した後、冷却固化して、第１成形品と第２成形品を接合する。第１成形品及び第２成形品それぞれの前記領域が接する界面のレーザー光による加熱溶融は、界面において第１成形品及び第２成形品を構成する樹脂組成物を撹拌することを含んでもよい。 The joining method of the resin molded product according to the present invention is a joining method of joining a resin molded product made of a resin composition, and absorbs the first molded product made of a resin composition that transmits laser light and / or laser light. The second molded product made of the resin composition is irradiated with ultraviolet light in the region where bonding is planned, and arranged so that the region of the second molded product is in contact with the region of the first molded product, The laser beam is irradiated from the first molded product side, the laser beam transmitted through the first molded product is absorbed in the region of the second molded product, and the respective interfaces of the first molded product and the second molded product are in contact with each other. Is heated and melted, and then cooled and solidified to join the first molded product and the second molded product. The heating and melting by the laser beam at the interface where the regions of the first molded product and the second molded product contact each other may include stirring the resin composition constituting the first molded product and the second molded product at the interface.
　樹脂組成物は、熱可塑性結晶性樹脂を含んでもよい。また紫外光は真空紫外光であってもよい。さらに第１成形品及び第２成形品を構成する樹脂組成物は、当該樹脂の融点＋３０℃、１０００ｓｅｃ－１で測定した溶融粘度が３００Ｐａ・ｓ以下であってもよい。なお、第１成形品及び第２成形品を形成する樹脂組成物は、同一であってもよく、異なっていてもよい。 The resin composition may include a thermoplastic crystalline resin. The ultraviolet light may be vacuum ultraviolet light. Further, the resin composition constituting the first molded product and the second molded product may have a melt viscosity of 300 Pa · s or less measured at a melting point of the resin + 30 ° C. and 1000 sec −1 . In addition, the resin composition which forms a 1st molded product and a 2nd molded product may be the same, and may differ.
　本発明によると、レーザー溶着により作製した複合成形品は、高い接合強度を有する。また、樹脂成形品の変形、特に三次元中空体を構成する樹脂成形品における中空部の変形を小さく抑えつつ、生産性及び形状自由度に優れた複合成形品を製造することができる。
さらに本発明によると、接合される前の複数の樹脂成形品を構成する樹脂組成物が異材同士の場合であっても、高い接合強度を有し、変形が小さく、生産性及び形状自由度に優れた複合成形品を製造することができる。 According to the present invention, the composite molded product produced by laser welding has a high bonding strength. In addition, it is possible to manufacture a composite molded product excellent in productivity and shape flexibility while suppressing deformation of the resin molded product, particularly deformation of the hollow portion in the resin molded product constituting the three-dimensional hollow body.
Furthermore, according to the present invention, even when the resin compositions constituting the plurality of resin molded products before being joined are different materials, they have high joining strength, small deformation, productivity and flexibility in shape. An excellent composite molded product can be produced.
樹脂成形品の接合方法の一連の工程を概略的に示す図である。It is a figure which shows roughly a series of processes of the joining method of a resin molded product. 真空紫外光照射装置の例を示す写真である。It is a photograph which shows the example of a vacuum ultraviolet light irradiation apparatus. 実施例で作製した複合成形品の形状を示す図である。It is a figure which shows the shape of the composite molded product produced in the Example.
　以下、本発明に係る樹脂成形品の接合方法の実施の形態について、図面を参照して詳細に説明する。本実施の形態では、樹脂組成物を射出成形した樹脂成形品を、レーザー溶着で接合した複合成形品を作製し、樹脂組成物として熱可塑性樹脂組成物を用いることを想定している。レーザー溶着により接合される樹脂成形品において、便宜上、レーザー光を透過させる側を第１成形品、レーザー光を吸収させる側を第２成形品と称することにする。 Hereinafter, embodiments of a method for joining resin molded products according to the present invention will be described in detail with reference to the drawings. In the present embodiment, it is assumed that a composite molded product obtained by joining resin molded products obtained by injection molding of a resin composition by laser welding is used, and a thermoplastic resin composition is used as the resin composition. In the resin molded product joined by laser welding, for the sake of convenience, the side through which laser light is transmitted is referred to as a first molded product, and the side through which laser light is absorbed is referred to as a second molded product.
　熱可塑性樹脂組成物は、熱可塑性結晶性樹脂及び／又は熱可塑性非晶性樹脂を含む組成物からなる。熱可塑性結晶性樹脂には、例えば、ポリオキシメチレン（ＰＯＭ）やポリブチレンテレフタレート（ＰＢＴ）、ポリエチレンテレフタレート（ＰＥＴ）、ポリフェニレンサルファイド（ＰＰＳ）、液晶ポリマー（ＬＣＰ）を使用してもよい。熱可塑性非晶性樹脂には、例えばポリカーボネート（ＰＣ）、環状ポリオレフィン（ＣＯＰ）、環状ポリオレフィン共重合体（ＣＯＣ）を使用してもよい。熱可塑性結晶性樹脂は、一般的に不透明であるが、結晶化度が低い樹脂では半透明ないしは透明であってもよい。また、熱可塑性樹脂組成物にはガラス繊維などの充填剤、酸化防止剤や安定剤、核剤、滑剤、可塑剤、離型剤、着色剤といった、一般的に樹脂組成物に添加される各種添加剤を、第１成形品のレーザー透過率を著しく損なわない範囲で添加してもよい。なお、熱可塑性樹脂組成物の粘度は、得たい樹脂成形品の肉厚に応じ、必要な成形性が得られる範囲で適宜選択することが可能だが、レーザー溶着の接合界面における樹脂の混ざり合いやすさの観点では、熱可塑性樹脂組成物の溶融粘度は低い方が好ましく、融点＋３０℃で測定した、１０００ｓｅｃ－１での溶融粘度が、３００Ｐａ・ｓ以下であることが好ましい。なお、溶融粘度の下限は特に限定されないが、極端に低い場合、樹脂の分子量が低すぎることによる物性の低下が懸念されるため、好ましくは５Ｐａ・ｓ以上であることが好ましい。 A thermoplastic resin composition consists of a composition containing a thermoplastic crystalline resin and / or a thermoplastic amorphous resin. As the thermoplastic crystalline resin, for example, polyoxymethylene (POM), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), or liquid crystal polymer (LCP) may be used. As the thermoplastic amorphous resin, for example, polycarbonate (PC), cyclic polyolefin (COP), and cyclic polyolefin copolymer (COC) may be used. Thermoplastic crystalline resins are generally opaque, but may be translucent or transparent for resins with low crystallinity. In addition, the thermoplastic resin composition includes various fillers such as glass fibers, antioxidants and stabilizers, nucleating agents, lubricants, plasticizers, mold release agents, and colorants, which are generally added to the resin composition. You may add an additive in the range which does not impair the laser transmittance of a 1st molded article notably. The viscosity of the thermoplastic resin composition can be appropriately selected within the range where the required moldability can be obtained according to the thickness of the resin molded product to be obtained. However, the resin can easily be mixed at the joining interface of laser welding. From this viewpoint, the melt viscosity of the thermoplastic resin composition is preferably low, and the melt viscosity at 1000 sec −1 measured at melting point + 30 ° C. is preferably 300 Pa · s or less. The lower limit of the melt viscosity is not particularly limited, but when it is extremely low, there is a concern that the physical properties are lowered due to the molecular weight of the resin being too low, and thus it is preferably 5 Pa · s or more.
　本実施の形態では、樹脂組成物を射出成形することにより作製された第１成形品と第２成形品を、それぞれの接合予定領域（真空紫外光を照射した面）が接するように配置し、レーザー光を透過する樹脂組成物からなる第１成形品側から、接合予定領域に向けてレーザー光を照射し、レーザー光を吸収する樹脂組成物からなる第２成形品の、接合予定領域でレーザー光を吸収させて、第１成形品と第２成形品の接合予定領域の界面を発熱させ、加熱溶融後に冷却固化することで、これらを互いに接合する。第１成形品及び第２成形品の接合予定領域には、表面が互いに接触可能な対向面が含まれる。第２成形品の対向面と、第１成形品の対向面が隙間なく密着していることで、溶融した界面が効率よく溶着されるため、これらの対向面は対応するような形状を有している。例えば、第１成形品の対向面が略平坦であれば、第２成形品の対向面もそれに対応した略平坦となる。また、対向面は、凹凸を有する面であってもよい。例えば、第１成形品の対向面が凹凸形状であれば、第２成形品の対向面にもそれに対応した凹凸形状となる。 In the present embodiment, the first molded product and the second molded product produced by injection molding of the resin composition are arranged so that the respective planned joining regions (surfaces irradiated with vacuum ultraviolet light) are in contact with each other, A laser beam is irradiated from the side of the first molded product made of a resin composition that transmits laser light toward the region to be joined, and the second molded product made of a resin composition that absorbs laser light in the region to be joined. The light is absorbed to generate heat at the interface between the first molded product and the second molded product to be joined, and are then solidified by cooling after heating and melting, thereby joining them together. The region to be joined of the first molded product and the second molded product includes opposing surfaces whose surfaces can contact each other. Since the opposed surface of the second molded product and the opposed surface of the first molded product are in close contact with each other, the melted interface is efficiently welded, so these opposed surfaces have corresponding shapes. ing. For example, if the opposing surface of the first molded product is substantially flat, the opposing surface of the second molded product is also substantially flat corresponding thereto. Further, the facing surface may be a surface having irregularities. For example, if the opposing surface of the first molded product is an uneven shape, the opposing surface of the second molded product also has an uneven shape corresponding thereto.
　図１は、本実施の形態の一連の工程を概略的に説明する図である。図１（ａ）に示すように、第１成形品１０１と第２成形品１０２を用意し、紫外光照射装置２０を用いて第１成形品１０１の照射面１０１ａ及び第２成形品１０２の照射面１０２ａに紫外光（ＵＶ）を照射する。第１成形品１０１の照射面１０１ａと、第２成形品１０２の照射面１０２ａとは、互いに接合が予定される領域（対向面）である。 FIG. 1 is a diagram schematically illustrating a series of steps of the present embodiment. Figure 1 (a), the first molded product 10 1 and providing a second molded article 10 2, a first molded article with ultraviolet light irradiation device 20 10 1 of the irradiated surface 10 1 a and the second irradiating ultraviolet light (UV) to the irradiated surface 10 2 a of the molded product 10 2. 1 and a radiation surface 10 of the first molded product 10 1, and the second molded product 10 second irradiation surface 10 2 a, an area (opposing surface) of the bonding is scheduled together.
　ここで、紫外光とは、波長が３８０ｎｍ以下のものを指す。特に紫外光の内で波長が２００ｎｍ以下のものは真空紫外光（ＶＵＶ）という。なお、真空紫外光は、必ずしも真空中で照射しなければならないものではないが、当該波長域の紫外光は空気による吸収が大きいため、空気中で照射する場合は、真空紫外光が伝播する距離を短くする必要がある。紫外光の波長は、接合強度の観点では短い方が有利であるため、真空紫外光を用いることが好ましいが、波長が短い真空紫外光では、照射による樹脂の劣化が懸念されるため、真空紫外光にするかどうかは使用する樹脂種に応じて適宜調整すればよい。 Here, ultraviolet light refers to light having a wavelength of 380 nm or less. Particularly, ultraviolet light having a wavelength of 200 nm or less is called vacuum ultraviolet light (VUV). In addition, vacuum ultraviolet light does not necessarily have to be irradiated in a vacuum, but ultraviolet light in the wavelength region is largely absorbed by air, so when irradiated in air, the distance that the vacuum ultraviolet light propagates Need to be shortened. Since it is advantageous to use a shorter ultraviolet wavelength from the viewpoint of bonding strength, it is preferable to use vacuum ultraviolet light. However, since vacuum ultraviolet light with a shorter wavelength may cause deterioration of the resin due to irradiation, vacuum ultraviolet light is used. Whether or not light is used may be appropriately adjusted according to the type of resin used.
　図１（ａ）において、紫外光照射装置２０は、Ｘｅエキシマランプなどの光源２１と、光源２１から放出された光を照射物に向けて反射する反射板２２とを有する真空紫外光照射装置である。図２は、真空紫外光照射装置の一例を示す写真である。この写真に示す真空紫外光照射装置は、筐体上面に形成された開口から上部に向けて紫外光を照射することができる。以下、紫外光照射装置２０及び紫外光を、真空紫外光照射装置２０及び真空紫外光と記載する場合がある。 In FIG. 1A, an ultraviolet light irradiation device 20 is a vacuum ultraviolet light irradiation device having a light source 21 such as an Xe excimer lamp and a reflection plate 22 that reflects light emitted from the light source 21 toward an irradiation object. is there. FIG. 2 is a photograph showing an example of a vacuum ultraviolet light irradiation apparatus. The vacuum ultraviolet light irradiation device shown in this photograph can irradiate ultraviolet light from the opening formed on the upper surface of the housing toward the upper part. Hereinafter, the ultraviolet light irradiation device 20 and the ultraviolet light may be described as the vacuum ultraviolet light irradiation device 20 and the vacuum ultraviolet light.
　図１（ａ）に示すように、第１成形品１０１は略平坦な照射面１０１ａを有し、第２成形品１０２は略平坦な照射面１０２ａを有している。本実施の形態では、真空紫外光照射装置２０から第１成形品１０１の照射面１０１ａ及び第２成形品１０２の照射面１０２ａに向けて真空紫外光を照射する。このような照射処理によって、第１成形品１０１の照射面１０１ａ及び第２成形品１０２の照射面１０２ａには、照射面１０１ａ及び照射面１０２ａから所定深さまで樹脂組成物の性状が変化した処理層１１１及び処理層１１２が形成される。 As shown in FIG. 1 (a), first molded product 10 1 has a generally flat illumination surface 10 1 a, the second molded product 10 2 has a substantially flat illumination surface 10 2 a. In this embodiment, the vacuum ultraviolet light irradiation toward the vacuum ultraviolet light irradiation device 20 in the first molded product 10 1 of the irradiated surface 10 1 a and the irradiation surface 10 2 a of the second molded product 10 2. Such irradiation treatment, the first molded product 10 1 of the irradiated surface 10 1 a and the second irradiated surface 10 2 a of the molded product 10 2, to a predetermined depth from the irradiated surface 10 1 a and the irradiation surface 10 2 a treatment layer 11 1 and the processing layer 11 2 that property changes of the resin composition is formed.
　本実施の形態では、第１成形品１０１及び第２成形品１０２への紫外光（真空紫外光）の照射時間は、照射面における照度を考慮して適宜設定することができる。例えば照射距離１０ｍｍ、照度６ｍＷ／ｃｍ２の条件で紫外光（真空紫外光）を照射する場合、照射時間は例えば７分とすることが挙げられるが、７分に限られることはなく、０分を超え１５分以下の時間であってもよい。また、３０秒以上１０分以下（例えば１分以上８分以下）の時間であってもよい。紫外光の照射により、第１成形品１０１の照射面１０１ａ及び第２成形品１０２の照射面１０２ａの劣化が進むことで、かえって接合強度が低下する場合があるため、第１成形品１０１及び第２成形品１０２への紫外光の照射は所定の時間内であることが好ましい。 In this embodiment, the irradiation time of the first molded product 10 1 and the second molded product 10 ultraviolet light to 2 (vacuum ultraviolet light) can be set as appropriate in consideration of the illuminance on the irradiated surface. For example, in the case of irradiating ultraviolet light (vacuum ultraviolet light) under conditions of an irradiation distance of 10 mm and an illuminance of 6 mW / cm 2 , the irradiation time may be, for example, 7 minutes, but is not limited to 7 minutes, and is 0 minutes. It may be longer than 15 minutes. Moreover, the time of 30 seconds or more and 10 minutes or less (for example, 1 minute or more and 8 minutes or less) may be sufficient. By irradiation with ultraviolet light, since that deterioration of the first molded product 10 1 of the irradiated surface 10 1 a and the second molded product 10 second irradiation surface 10 2 a proceeds, the rather bonding strength may be lowered, the 1 irradiation of the ultraviolet light to the molded article 10 1 and the second molded product 10 2 is preferably within a predetermined time.
　ここで照度は、照射距離（光源から照射面までの距離）や照射装置の出力等により変わるため、紫外光の照射条件としては、照度と照射時間の積から得られる照射エネルギー量をもとに決定してもよい。照射エネルギー量としては、０．１Ｊ／ｃｍ２以上１０Ｊ／ｃｍ２以下であってもよく、また０．５Ｊ／ｃｍ２以上６Ｊ／ｃｍ２以下（例えば１Ｊ／ｃｍ２以上３Ｊ／ｃｍ２以下）であってもよい。すなわち、照射装置の出力を上げ、照射距離を短くすることで、照度を高くした場合、照射時間を短くできるため、より短時間での処理が可能となる。ただし、その場合、接合面の凹凸や反りなどの影響による処理ムラが出やすくなる可能性がある。なお、紫外光の照射は、第１成形品１０１及び第２成形品１０２の両方でなければならない訳ではなく、第１成形品１０１又は第２成形品１０２のいずれか一方のみへの照射でもよい。 Here, the illuminance changes depending on the irradiation distance (distance from the light source to the irradiation surface), the output of the irradiation device, etc., so the irradiation condition of the ultraviolet light is based on the irradiation energy amount obtained from the product of the illuminance and the irradiation time. You may decide. The irradiation energy amount may be at 0.1 J / cm 2 or more 10J / cm 2 or less, also 0.5 J / cm 2 or more 6J / cm 2 or less (e.g., 1 J / cm 2 or more 3J / cm 2 or less) It may be. In other words, when the illuminance is increased by increasing the output of the irradiation device and shortening the irradiation distance, the irradiation time can be shortened, so that processing in a shorter time becomes possible. However, in that case, there is a possibility that uneven processing due to the influence of unevenness or warpage of the joint surface is likely to occur. The irradiation of ultraviolet light, not must be both the first molded product 10 1 and the second molded product 10 2, first forming 10 1 or the second molded product 10 2 either to only one May be irradiated.
　図１（ｂ）に示すように、真空紫外光が照射された第１成形品１０１及び第２成形品１０２をそれぞれの照射面１０１ａ及び照射面１０２ａが接するように配置する。 As shown in FIG. 1 (b), arranging the first molded product 10 1 and the second molded product 10 2 vacuum ultraviolet light is irradiated so that respective irradiation surface 10 1 a and the irradiation surface 10 2 a contact .
　ここで、より高い接合強度を確保するためには、第１成形品１０１及び第２成形品１０２を配置する操作は、第１成形品１０１及び第２成形品１０２に紫外光（真空紫外光）を照射する工程（図１（ａ）を参照）を終えてから、できるだけ短時間で行うことが望ましい。前記時間は、例えば、好ましくは１０日以内、より好ましくは１日以内、さらに好ましくは２時間以内、特に好ましくは３０分以内、最も好ましくは５分以内である。 Here, in order to secure higher bonding strength, the operation of placing the first molded product 10 1 and the second molded product 10 2, first forming 10 1 and the second molded product 10 2 to ultraviolet light ( It is desirable to carry out in as short a time as possible after finishing the step of irradiating (vacuum ultraviolet light) (see FIG. 1A). The time is, for example, preferably within 10 days, more preferably within 1 day, even more preferably within 2 hours, particularly preferably within 30 minutes, and most preferably within 5 minutes.
　図１（ｃ）に示すように、レーザー光照射装置３０を用いて、第１成形品１０１側からレーザー光を照射し、第１成形品１０１を透過したレーザー光が第２成形品１０２に吸収されることで、照射面１０１ａ及び照射面１０２ａの界面が発熱し、第１成形品１０１と第２成形品１０２を構成する樹脂組成物が加熱溶融される。図中において、レーザー光照射装置３０から出射されたレーザー光のビーム２００は、照射面１０１ａ及び照射面１０２ａの界面の付近に集光点２０１が位置するように集光される。 As shown in FIG. 1 (c), by using a laser beam irradiation apparatus 30 irradiates a laser beam from the first molded product 10 1 side, the laser beam transmitted through the first molded product 10 1 second forming 10 by being absorbed into 2, and heating the interface of the irradiated surface 10 1 a and the irradiation surface 10 2 a is, the resin composition constituting the first molded product 10 1 and the second molded product 10 2 is heated and melted. In the figure, the laser beam 200 emitted from the laser beam irradiation device 30 is focused so that the focusing point 201 is positioned in the vicinity of the interface between the irradiated surface 10 1 a and the irradiated surface 10 2 a.
　図１（ｄ）に第１成形品１０１と第２成形品１０２の集光点２０１の付近を拡大して示すように、第１成形品１０１と第２成形品１０２を構成する樹脂組成物は、照射面１０１ａ及び照射面１０２ａの界面の付近に位置するレーザー光の集光点２０１において溶融され、溶融部１２を形成する。溶融部１２においては、樹脂組成物が溶融された状態でさらにレーザー光のエネルギーを受けることによって、界面に湯流れ（撹拌）１２ａが発生し、第１成形品１０１と第２成形品１０２のそれぞれの樹脂組成物が混ざり合った状態となる。 As shown enlarged in the vicinity of the first molded product 10 1 and the second molded product 10 and second focal point 201 in FIG. 1 (d), constituting the first molded product 10 1 and the second molded product 10 2 The resin composition is melted at the laser light condensing point 201 located in the vicinity of the interface between the irradiated surface 10 1 a and the irradiated surface 10 2 a to form the melted portion 12. In the melting section 12, by receiving the energy of the further laser beam while the resin composition is melted, the molten metal flow (stirring) 12a is generated at the interface, the first molded product 10 1 and the second molded product 10 2 The respective resin compositions are mixed together.
　ここで、第１成形品１０１と第２成形品１０２を構成する樹脂組成物の相溶性が高ければ、界面が混ざり合った状態のまま冷却固化されるが、相溶性の低い樹脂組成物の組合せである場合、通常のレーザー溶着では冷却固化の過程で樹脂組成物が相分離し、十分な接合性は得られない。しかし、本実施の形態のように、あらかじめ紫外光の照射により、第１成形品１０１と第２成形品１０２の表面が活性化されていれば、それぞれを構成する樹脂組成物の相溶性が低い場合であっても、界面が混ざり合った状態を保持したまま冷却固化される。これによって、第１成形品１０１及び第２成形品１０２は、一体として接合され、単一の複合成形品（例えば三次元中空体）を構成するようになる。なお、相溶性の高い樹脂組成物の組合せの場合であっても、本実施の形態のように、紫外光の照射を行っていれば、界面での樹脂の混ざり合いが促進され、紫外光を照射しない場合に比べ、さらに良好な接合性が得られる。 Here, the higher the compatibility of the resin composition constituting the first molded product 10 1 and the second molded product 10 2, but still are cooled and solidified in a state where the interface is mixed, the compatibility is resin composition In the case of this combination, the resin composition phase-separates in the process of cooling and solidification in ordinary laser welding, and sufficient bonding properties cannot be obtained. However, as in the present embodiment, the irradiation of the pre-ultraviolet light, if the first molded product 10 1 and the second molded product 10 second surface if activated, the compatibility of the resin composition constituting each Even if it is low, it cools and solidifies, maintaining the state where the interface was mixed. Accordingly, the first molded product 10 1 and the second molded product 10 2 are joined integrally, so constituting a single composite molded article (e.g., three-dimensional hollow bodies). Even in the case of a combination of highly compatible resin compositions, if irradiation with ultraviolet light is performed as in this embodiment, mixing of the resin at the interface is promoted, and ultraviolet light is emitted. Even better bondability can be obtained compared to the case of no irradiation.
　近年では、小型化・軽量化のために複数の部品を統合・一体化する要求から、相溶性の低い樹脂からなる樹脂成形品同士を接合した、いわゆる異材接合による複合成形品も求められるようにもなっている。本実施の形態の接合方法は、異材接合による複合成形品の製造においても、接合強度、生産性、形状自由度に優れている。 In recent years, in order to reduce the size and weight, there is also a demand for composite molded products by so-called dissimilar material bonding, which are made by joining together resin molded products made of resins with low compatibility, in order to integrate and integrate multiple parts. It is also. The bonding method of the present embodiment is excellent in bonding strength, productivity, and shape flexibility even in the manufacture of a composite molded product by bonding different materials.
　第１成形品１０１と第２成形品１０２との接合は、真空紫外光により活性化された第１成形品１０１の処理層１１１と第２成形品１０２の処理層１１２が、レーザー光のエネルギーにより加熱溶融・撹拌されるものである。したがって、第１成形品１０１及び第２成形品１０２の接続は、機械的に堅牢であり、化学的にも安定である。 The first molded product 10 1 and the bonding between the second molded product 10 2, the processing layer 11 second treatment layer 11 1 and the second molded product 10 2 of first molded product 10 1 is activated by the vacuum ultraviolet light It is heated and melted and stirred by the energy of the laser beam. Therefore, the connection of the first molded product 10 1 and the second molded product 10 2 are mechanically robust, which is chemically stable.
　本実施の形態では、第１成形品１０１及び第２成形品１０２に処理層１１１及び処理層１１２を形成し、レーザー溶着により処理層１１１及び処理層１１２のみを溶融・撹拌し第１成形品１０１に第２成形品１０２を接続するものである。したがって、成形品全体に過大な熱や圧力、振動等が加えられる訳ではないため、接合による変形やバリの発生が抑えられ、内部に部品が収容される場合も、それらの部品を損傷させることもない。 In this embodiment, the processing layer 11 1 and the processing layer 11 2 is formed on the first molded article 10 1 and the second molded product 10 2, melting and stirring only treatment layer 11 1 and the processing layer 11 2 by laser welding to the first molded product 10 1 is intended to connect the second molded product 10 2. Therefore, excessive heat, pressure, vibration, etc. are not applied to the entire molded product, so that deformation and burring due to bonding can be suppressed, and even when components are housed inside, they can be damaged. Nor.
　本実施の形態は、樹脂組成物として、熱可塑性結晶性樹脂及び／又は熱可塑性非晶性樹脂を含む熱可塑性樹脂組成物を用いることができる。熱可塑性結晶性樹脂としては、堅牢で安定した性質を有するポリオキシメチレン（ＰＯＭ）やポリブチレンテレフタレート（ＰＢＴ）樹脂、ポリエチレンテレフタレート（ＰＥＴ）樹脂、ポリフェニレンサルファイド（ＰＰＳ）樹脂、液晶ポリマー（ＬＣＰ）のような熱可塑性結晶性樹脂を利用することができ、熱可塑性非晶性樹脂としては、ポリカーボネート（ＰＣ）、環状ポリオレフィン（ＣＯＰ）、環状ポリオレフィン共重合体（ＣＯＣ）のような熱可塑性非晶性樹脂を利用することができる。特に熱可塑性結晶性樹脂は、機械的強度や耐熱性、耐薬品性が要求される樹脂成形品の作製に利用することができる。 In the present embodiment, a thermoplastic resin composition containing a thermoplastic crystalline resin and / or a thermoplastic amorphous resin can be used as the resin composition. Thermoplastic crystalline resins include polyoxymethylene (POM), polybutylene terephthalate (PBT) resin, polyethylene terephthalate (PET) resin, polyphenylene sulfide (PPS) resin, and liquid crystal polymer (LCP), which have robust and stable properties. Such thermoplastic crystalline resins can be used, and thermoplastic amorphous resins include thermoplastic amorphous resins such as polycarbonate (PC), cyclic polyolefin (COP), and cyclic polyolefin copolymer (COC). Resin can be used. In particular, the thermoplastic crystalline resin can be used for producing a resin molded product that requires mechanical strength, heat resistance, and chemical resistance.
　上述の本実施の形態を適用した実施例について説明する。図３に複合成形品の形状を示す。図３の例では、レーザー透過性の樹脂組成物を射出成形して４０×１０×１ｍｍの第１成形品１０１を作製し、レーザー吸収性の樹脂組成物を射出成形して５０×１３×３ｍｍの第２成形品１０２を作製し、第１成形品１０１の４０×１０ｍｍの照射面１０１ａ及び第２成形品１０２の５０×１３ｍｍの照射面１０２ａにそれぞれ真空紫外光（波長１７２ｎｍ、出力電圧１６ｋＶ、照射距離１０ｍｍ（照度６ｍＷ／ｃｍ２）、照射時間７分）を照射した。真空紫外光の照射により、第１成形品１０１の照射面１０１ａ及び第２成形品１０２の照射面１０２ａには、照射面１０１ａ及び照射面１０２ａから所定深さまで樹脂組成物の性状が変化した処理層１１１及び処理層１１２が形成された。 An example to which the above-described embodiment is applied will be described. FIG. 3 shows the shape of the composite molded product. In the example of FIG. 3, the laser-transmissible resin composition to prepare a first shaped article 10 1 of the injection molded to 40 × 10 × 1mm, 50 × 13 × injection molded laser absorptive resin composition to produce a second molded product 10 2 3 mm, the first molded product 10 1 of 40 × 10 mm irradiated surface 10 1 a and the respective vacuum ultraviolet light irradiation surface 10 2 a of the second 50 × 13 mm of the molded product 10 2 (Wavelength 172 nm, output voltage 16 kV, irradiation distance 10 mm (illuminance 6 mW / cm 2 ), irradiation time 7 minutes). By irradiation with vacuum ultraviolet light, the first molded product 10 1 of the irradiated surface 10 1 a and the second irradiated surface 10 2 a of the molded product 10 2, to a predetermined depth from the irradiated surface 10 1 a and the irradiation surface 10 2 a treatment layer 11 1 and the processing layer 11 2 that property changes of the resin composition is formed.
　第１成形品１０１及び第２成形品１０２に真空紫外光を照射した後、第１成形品１０１の照射面１０１ａ及び第２成形品１０２の照射面１０２ａが互いに１０×１０ｍｍの面積で接するように、第１成形品１０１と第２成形品１０２それぞれの長手方向の端部から所定距離までの部分をオーバーラップさせて配置した。そして、オーバーラップした部分の略中央部に、第１成形品１０１側からレーザー光（波長９４０ｎｍ、出力２４Ｗ、ビーム径１．６ｍｍφ、走査速度２０ｍｍ／ｓｅｃ）を、複合成形品の長手方向に対し直角方向に走査させるように照射し、１．６ｍｍ×６ｍｍの領域に溶融部１２を形成して第１成形品１０１及び第２成形品１０２をレーザー溶着し、複合成形品を作製した。 After irradiation with vacuum ultraviolet light to the first molded product 10 1 and the second molded product 10 2, first molded product 10 1 of the irradiated surface 10 1 a and the second molded product 10 second irradiation surface 10 2 a from each other 10 in contact with an area of × 10 mm, it was first molded article 10 1 and be overlapped portion of the predetermined distance from the second molded product 10 2 each longitudinal end disposed. Then, at a substantially central portion of the overlapping portion, the laser beam from the first molded product 10 1 side (wavelength 940 nm, output 24W, a beam diameter 1.6 mm, the scanning speed of 20 mm / sec) and, in the longitudinal direction of the composite molded article irradiated so as to scan in a perpendicular direction against the first molded product 10 1 and the second molded product 10 2 laser welding to form a molten part 12 in the region of 1.6 mm × 6 mm, to prepare a composite molded article .
　第１成形品及び第２成形品には下記の樹脂組成物の組合せを用いた。
・実施例１
第１成形品：ウィンテックポリマー社製ＰＢＴ　ジュラネックス（登録商標）　２００２（非強化のＰＢＴ樹脂組成物、２５０℃、１０００ｓｅｃ－１での溶融粘度２６０Ｐａ・ｓ）
第２成形品：ポリプラスチックス社製ＰＰＳ　ジュラファイド（登録商標）　１１３０Ａ１（ガラス繊維３０質量％強化のＰＰＳ樹脂組成物、３１０℃、１０００ｓｅｃ－１での溶融粘度３５０Ｐａ・ｓ）
・実施例２
第１成形品：ウィンテックポリマー社製ＰＢＴ　ジュラネックス（登録商標）　２００２（非強化のＰＢＴ樹脂組成物、２５０℃、１０００ｓｅｃ－１での溶融粘度２６０Ｐａ・ｓ）
第２成形品：ポリプラスチックス社製ＰＰＳ　ジュラファイド（登録商標）　１１３０Ａ６（ガラス繊維３０質量％強化のＰＰＳ樹脂組成物、３１０℃、１０００ｓｅｃ－１での溶融粘度２２０Ｐａ・ｓ） The following combinations of resin compositions were used for the first molded product and the second molded product.
Example 1
First molded article: PBT DURANEX (registered trademark) 2002 manufactured by Wintech Polymer Co., Ltd. (unreinforced PBT resin composition, melt viscosity at 250 ° C., 1000 sec −1 at 260 Pa · s)
Second molded product: PPS Durafide (registered trademark) 1130A1 manufactured by Polyplastics Co., Ltd. (PPS resin composition reinforced with 30% by mass of glass fiber, melt viscosity 350 Pa · s at 310 ° C. and 1000 sec −1 )
Example 2
First molded article: PBT DURANEX (registered trademark) 2002 manufactured by Wintech Polymer Co., Ltd. (unreinforced PBT resin composition, melt viscosity at 250 ° C., 1000 sec −1 at 260 Pa · s)
Second molded article: PPS Durafide (registered trademark) 1130A6 manufactured by Polyplastics Co., Ltd. (PPS resin composition reinforced with 30% by mass of glass fiber, melt viscosity 220 Pa · s at 310 ° C. and 1000 sec −1 )
　なお、比較例１として、レーザー溶着の前に真空紫外光の照射を行わない以外は実施例１と同様に操作したものについても評価を行った。また、相溶性の高い樹脂組成物の組合せとして、同材同士の接合についても評価を行った。具体的には、実施例３として、第１成形品と第２成形品の両方にウィンテックポリマー社製ＰＢＴ　ジュラネックス（登録商標）　２００２（非強化のＰＢＴ樹脂組成物、２５０℃、１０００ｓｅｃ－１での溶融粘度２６０Ｐａ・ｓ）を用いた以外は実施例１と同様に操作したもの、及び比較例２として、レーザー溶着の前に真空紫外光の照射を行わない以外は実施例３と同様に操作したものについても評価を行った。 In addition, as Comparative Example 1, the same operation as in Example 1 was also performed except that the irradiation with vacuum ultraviolet light was not performed before laser welding. Moreover, it evaluated also about joining of the same material as a combination of a highly compatible resin composition. Specifically, as Example 3, PBT DURANEX (registered trademark) 2002 (unreinforced PBT resin composition, 250 ° C., 1000 sec −1 ) manufactured by Wintech Polymer Co., Ltd. was used for both the first molded product and the second molded product. In the same manner as in Example 3 except that irradiation with vacuum ultraviolet light was not performed before laser welding as Comparative Example 2 except that the melt viscosity at 260 Pa · s) was used. The operation was also evaluated.
　上記により作製した複合成形品を、引張試験機（島津製作所製、オートグラフＡＧ－２０ｋＮＸＤｐｌｕｓ）を用いて５ｍｍ／ｍｉｎで引張試験を行い、引張剪断強度を測定した結果、実施例１の複合成形品では１２．１ＭＰａ、実施例２の複合成形品では１８．５ＭＰａであったのに対し、比較例１では０ＭＰａ（接合せず）であった。また、実施例３の複合成形品では３２．０ＭＰａであったのに対し、比較例２では２８．２ＭＰａであった。 The composite molded product produced as described above was subjected to a tensile test at 5 mm / min using a tensile tester (manufactured by Shimadzu Corporation, Autograph AG-20kNXDplus), and the tensile shear strength was measured. Was 12.1 MPa, and the composite molded product of Example 2 was 18.5 MPa, while Comparative Example 1 was 0 MPa (not joined). Moreover, it was 32.0 MPa in the composite molded product of Example 3, whereas it was 28.2 MPa in Comparative Example 2.
　比較例１の通り、紫外光を照射しない通常のレーザー溶着では、相溶性の低い異材であるＰＢＴ樹脂組成物とＰＰＳ樹脂組成物からなる樹脂成形品を接合することはできなかったが、紫外光を照射した後でレーザー溶着を行った実施例１及び実施例２では、異材同士の樹脂成形品を接合した複合成形品において十分な接合強度が得られた。なお、実施例２では実施例１よりも高い接合強度が得られており、樹脂組成物の溶融粘度は低い方が接合強度面で有利となることが分かる。これは溶融した界面における湯流れ（撹拌）の起こりやすさによるものと考えられる。また、比較例２と実施例３の対比で分かる通り、同材同士の組合せでのレーザー溶着においても、紫外光照射による前処理を行うことで、さらに高い接合強度が得られた。 As in Comparative Example 1, in ordinary laser welding without irradiation with ultraviolet light, it was not possible to join a PBT resin composition and a PPS resin composition, which are different materials having low compatibility, but ultraviolet light. In Example 1 and Example 2 in which laser welding was performed after irradiation, sufficient joint strength was obtained in a composite molded product in which resin molded products of different materials were joined. In addition, in Example 2, the joint strength higher than Example 1 is obtained, and it turns out that the one where the melt viscosity of a resin composition is low becomes advantageous in terms of joint strength. This is thought to be due to the ease of hot water flow (stirring) at the melted interface. Further, as can be seen from the comparison between Comparative Example 2 and Example 3, even in laser welding using a combination of the same materials, a higher bonding strength was obtained by performing pretreatment by ultraviolet light irradiation.
　さらに実施例４として、樹脂組成物の組合せを下記に変更し、溶着時のレーザー光の出力を３０Ｗにした以外は実施例１と同様に操作したものについても評価を行った。
第１成形品：ウィンテックポリマー社製ＰＢＴ　ジュラネックス（登録商標）　２００２（非強化のＰＢＴ樹脂組成物、２５０℃、１０００ｓｅｃ－１での溶融粘度２６０Ｐａ・ｓ）
第２成形品：ポリプラスチックス社製ＰＰＳ　ジュラファイド（登録商標）　０２２０Ａ９（非強化のＰＰＳ樹脂組成物、３１０℃、１０００ｓｅｃ－１での溶融粘度５００Ｐａ・ｓ） Further, as Example 4, the combination of the resin compositions was changed to the following, and the same operation as in Example 1 was performed except that the laser beam output at the time of welding was changed to 30 W. Evaluation was also performed.
First molded article: PBT DURANEX (registered trademark) 2002 manufactured by Wintech Polymer Co., Ltd. (unreinforced PBT resin composition, melt viscosity at 250 ° C., 1000 sec −1 at 260 Pa · s)
Second molded product: PPS Durafide (registered trademark) 0220A9 manufactured by Polyplastics Co., Ltd. (non-reinforced PPS resin composition, melt viscosity of 500 Pa · s at 310 ° C. and 1000 sec −1 )
　また、紫外光の波長による影響を確認するため、実施例５として、真空紫外光の代わりに、波長２５４ｎｍの紫外光を、照度６ｍＷ／ｃｍ２で７分間照射した以外は実施例４と同様に操作したもの、及び比較例３として、レーザー溶着の前に真空紫外光の照射を行わない以外は実施例４と同様に操作したものについても評価を行った。 Moreover, in order to confirm the influence by the wavelength of ultraviolet light, Example 5 was the same as Example 4 except that ultraviolet light having a wavelength of 254 nm was irradiated for 7 minutes at an illuminance of 6 mW / cm 2 instead of vacuum ultraviolet light. As an operation and Comparative Example 3, evaluation was also performed on the same operation as in Example 4 except that the irradiation with vacuum ultraviolet light was not performed before laser welding.
　上記により作製した複合成形品を、引張試験機（島津製作所製、オートグラフＡＧ－２０ｋＮＸＤｐｌｕｓ）を用いて５ｍｍ／ｍｉｎで引張試験を行い、引張剪断強度を測定した結果、実施例４では１９．８ＭＰａ、実施例５では１１．０ＭＰａ、比較例３では９．８ＭＰａとなっており、前処理として紫外光、特に真空紫外光を照射することで、レーザー溶着の接合強度が高くなることが確認された。 The composite molded product produced as described above was subjected to a tensile test at 5 mm / min using a tensile tester (manufactured by Shimadzu Corporation, Autograph AG-20kNXDplus), and the tensile shear strength was measured. In Example 5, it was 11.0 MPa, and in Comparative Example 3, it was 9.8 MPa, and it was confirmed that the bonding strength of laser welding was increased by irradiating ultraviolet light, particularly vacuum ultraviolet light, as pretreatment. .
　なお、樹脂組成物として、第１成形品と第２成形品の両方にウィンテックポリマー社製ＰＢＴ　ジュラネックス（登録商標）　２００２（非強化のＰＢＴ樹脂組成物、２５０℃、１０００ｓｅｃ－１での溶融粘度２６０Ｐａ・ｓ）の同材同士の組合せを用い、溶着時のレーザー光の出力を２４Ｗにした以外は、実施例４、実施例５、比較例３とそれぞれ同様に操作した実施例６、実施例７、比較例４についても評価を行った結果、引張剪断強度は、真空紫外光を照射した実施例６が２７．２ＭＰａ、紫外光を照射した実施例７が１５．７ＭＰａ、（真空）紫外光を照射しなかった比較例４が１０．１ＭＰａとなっており、異材での接合を行った実施例４、実施例５、比較例３での傾向と同様に、前処理として紫外光、特に真空紫外光を照射することで、レーザー溶着の接合強度が高くなることが確認された。 In addition, as the resin composition, both the first molded product and the second molded product were PBT DURANEX (registered trademark) 2002 (unreinforced PBT resin composition, 250 ° C., 1000 sec −1 ) manufactured by Wintech Polymer Co., Ltd. Example 6 was carried out in the same manner as in Example 4, Example 5 and Comparative Example 3, except that a combination of the same materials having a viscosity of 260 Pa · s) was used and the output of the laser beam during welding was 24 W. As a result of evaluating Example 7 and Comparative Example 4, the tensile shear strength was 27.2 MPa in Example 6 irradiated with vacuum ultraviolet light, 15.7 MPa in Example 7 irradiated with ultraviolet light, and (vacuum) ultraviolet. The comparative example 4 which did not irradiate light is 10.1 MPa, and similarly to the tendency in the example 4, the example 5 and the comparative example 3 in which the joining with the different materials was performed, the ultraviolet light as the pretreatment, particularly Irradiate vacuum ultraviolet light And, the bonding strength of the laser welding that increases was confirmed.
　１０１　第１成形品
　１０２　第２成形品
　１２　溶融部
　１２ａ　湯流れ（撹拌）
　２０　紫外光照射装置（真空紫外光照射装置）
　３０　レーザー光照射装置 10 1 1st molded product 10 2 2nd molded product 12 Melting part 12a Hot water flow (stirring)
20 Ultraviolet light irradiation device (vacuum ultraviolet light irradiation device)
30 Laser beam irradiation device

Claims (6)

  1. 　樹脂組成物からなる樹脂成形品を接合する接合方法であって、
    　レーザー光を透過する樹脂組成物からなる第１成形品及び／又はレーザー光を吸収する樹脂組成物からなる第２成形品の、接合が予定される領域に紫外光を照射し、
    　前記第１成形品の前記領域に前記第２成形品の前記領域が接するように配置した上で、
    　前記第１成形品側からレーザー光を照射し、前記第１成形品を透過したレーザー光を、前記第２成形品の前記領域において吸収させ、
    　前記第１成形品及び前記第２成形品それぞれの前記領域が接する界面をレーザー光で加熱溶融した後、冷却固化して、前記第１成形品と前記第２成形品を接合すること
    　を含む接合方法。     A bonding method for bonding a resin molded product made of a resin composition,
    Irradiating the region where bonding is planned, of the first molded product made of a resin composition that transmits laser light and / or the second molded product made of a resin composition that absorbs laser light,
    After arranging the region of the second molded product so as to contact the region of the first molded product,
    Irradiating laser light from the first molded product side, absorbing the laser light transmitted through the first molded product in the region of the second molded product,
    Joining the first molded product and the second molded product after melting and solidifying the interface where the regions of the first molded product and the second molded product are in contact with each other by laser light. Method.
  2. 　前記第１成形品及び前記第２成形品それぞれの前記領域が接する界面のレーザー光による加熱溶融は、前記界面において前記第１成形品及び前記第２成形品を構成する樹脂組成物を撹拌することを含む請求項１に記載の接合方法。 Heat melting by laser light at the interface where the regions of the first molded product and the second molded product contact each other stirs the resin composition constituting the first molded product and the second molded product at the interface. The bonding method according to claim 1, comprising:
  3. 　前記樹脂組成物は、熱可塑性結晶性樹脂を含む請求項１又は２に記載の接合方法。 The joining method according to claim 1 or 2, wherein the resin composition contains a thermoplastic crystalline resin.
  4. 　前記紫外光は、真空紫外光である請求項１から３のいずれか１項に記載の接合方法。 The bonding method according to any one of claims 1 to 3, wherein the ultraviolet light is vacuum ultraviolet light.
  5. 　前記第１成形品及び／又は前記第２成形品を構成する前記樹脂組成物は、融点＋３０℃、１０００ｓｅｃ－１で測定した溶融粘度が３００Ｐａ・ｓ以下である請求項１から４のいずれか１項に記載の接合方法。 5. The resin composition constituting the first molded product and / or the second molded product has a melt viscosity of 300 Pa · s or less measured at a melting point of + 30 ° C. and 1000 sec −1. The joining method according to item.
  6. 　前記第１成形品を構成する前記樹脂組成物と、前記第２成形品を構成する前記樹脂組成物が、主として異なる樹脂を母材とする樹脂組成物である請求項１から５のいずれか１項に記載の接合方法。 6. The resin composition according to claim 1, wherein the resin composition constituting the first molded product and the resin composition constituting the second molded product are resin compositions mainly composed of different resins. The joining method according to item.
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EP1522550A3 (en) * 2003-10-09 2010-10-13 Weidmann Plastics Technology AG Method for joining two workpieces without the use foreign material and joined workpiece

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JPS6246621A (en) * 1985-08-23 1987-02-28 Toyota Motor Corp Joint of synthetic resin material
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JP2005336229A (en) * 2004-05-24 2005-12-08 Polyplastics Co Polyarylene sulfide resin composition for laser welding and molding
JP2006187730A (en) * 2005-01-06 2006-07-20 Nippon Filcon Co Ltd Method for manufacturing resin-made micro flow passage chemical device and structure of resin-made micro flow passage chemical device manufactured thereby
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