JP4030897B2 - Plastic bonding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of adhering plastic to glass, ceramics, metals (including alloys), plastics, wood and the like without using an adhesive.
[0002]
[Prior art]
Conventionally, an adhesive is generally used to bond a plastic to various materials. Types of adhesives include solvent drying, catalyst addition, moisture curing, anaerobic, and instantaneous room temperature curing types, thermosetting types, ultraviolet curing types, hot melt types, rehumidifying types, pressure sensitive types, etc. There are different types depending on the compatibility with the plastic and the member to which they are bonded, the purpose of use, and the like.
[0003]
However, depending on the purpose of the target member or molded product, the plastic and the member are directly bonded without using an adhesive as much as possible from the aspects of chemical resistance, heat resistance, dimensional stability, electrical properties, optical properties, etc. It is demanded.
[0004]
Patent Document 1 describes that after improving the adhesiveness by irradiating the polyparabanic acid film with ultraviolet rays, the laminate is laminated with or without an adhesive layer. In the case where there is no adhesive, it is limited only to the case of using a laminate having adhesiveness, and it is necessary to use an adhesive in order to adhere to the laminate having no adhesiveness.
[0005]
In addition, in the method of bonding rubber and polyamide described in Patent Document 2 and Patent Document 3, after the rubber composition is subjected to ultraviolet treatment, plasma treatment, corona discharge, etc., it is allowed to adhere without using an adhesive. It is necessary to bond the polyamide in a molten state, and it cannot be applied to bonding with a heat-sensitive member.
[0006]
[Patent Document 1]
JP-A-4-55438 [Patent Document 2]
JP 2001-162645 A [Patent Document 3]
Japanese Patent Laid-Open No. 2001-162723
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and since an adhesive is not used, it is a cheaper method than the conventional method using an adhesive and it is easy to omit the number of members.
[0008]
Moreover, since this invention is related with the method of adhere | attaching the member which does not have adhesiveness previously, a various member can be used.
[0009]
Moreover, since the present invention is different from pressure and heat bonding methods such as pressure bonding, thermocompression bonding, and heat fusion, it can also be used for members that are sensitive to pressure and heat.
[0010]
[Means for Solving the Problems]
As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the plastic is bonded without using an adhesive by irradiating the plastic with energy rays, and the present invention has been completed.
[0011]
That is, according to the present invention, in a plastic bonding method for bonding a first adherend made of plastic and a second adherend, energy having an energy of 4 eV or more on at least a bonding surface of the plastic as the first adherend. Contact the wire with a liquid in which the first deposit contains any one of water, hydrogen peroxide, ammonia, alcohols, organic acids and derivatives thereof, nitriles, nitro compounds, amines, sulfur compounds And the step of irradiating the first adherend and the second adherend without using an adhesive, wherein the first adherend and the second adherend are energized. Before irradiation with radiation, it is not sticky or adhesive, and the first adherend is capable of obtaining adhesiveness or adhesiveness by irradiation with energy rays. A method of bonding plastic to be about.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The inventors of the present invention applied an energy ray having an energy of 4 eV or more to plastic , any of water, hydrogen peroxide, ammonia, alcohols, organic acids and derivatives thereof, nitriles, nitro compounds, amines, and sulfur compounds. It was found that the plastic can be bonded to other members without using an adhesive by irradiating in contact with a liquid containing any one of them and developing adhesiveness or adhesiveness.
[0013]
In the present invention, the other member that is the second adherend for adhering the plastic that is the first adherend is preferably plastic, but other than plastic such as glass, ceramics, wood, and metal (including alloys). May be good. When the plastics are bonded to each other, the same material plastic may be used, or different materials may be used.
[0014]
The energy beam may be irradiated only to the first adherend made of the plastic to be bonded, but the second adherend and the second adherent made of plastic, glass, ceramics, wood, metal (including alloy), etc. You may irradiate both to an adherend. Moreover, different energy rays may be irradiated to the adhesion surface of each adherend, and irradiation may be performed in different atmospheres.
[0015]
In addition, the first adherend made of plastic in the present application and the second adherend made of plastic, glass, ceramics, wood and metal (including alloy) are pre-adhesive or adhesive before irradiation with energy rays. The present invention relates to a method for bonding them.
[0016]
Moreover, it is possible to shorten the irradiation time of an energy beam by heating the first adherend before energy beam irradiation and / or at the time of energy beam irradiation. If desired, the second adherend may be heated before energy beam irradiation and / or during energy beam irradiation.
[0017]
In the present invention, the temperature at which the first adherend and the second adherend are bonded is preferably room temperature, but the first and second adherend surfaces are sticky or bonded. You may make it adhere | attach in the heating state of the temperature which does not show property.
[0018]
The energy beam in the present invention is an energy beam such as an ultraviolet ray, an electron beam, or an ion beam, and the energy needs to be 4 eV or more, and preferably 7 eV or more. Among these, laser sources such as excimer laser, Ar ⁺ laser, Kr ⁺ laser, N ₂ laser; D ₂ lamp, high pressure mercury lamp, low pressure mercury lamp, Xe lamp, Hg-Xe lamp, halogen lamp, excimer Examples include lamps or ultraviolet lamps such as discharge lamps obtained by arc, corona or silent discharge in air, nitrogen or other gas atmosphere. Among these, ultraviolet lamps such as D ₂ lamp, high pressure mercury lamp, low pressure mercury lamp, Xe lamp, Hg-Xe lamp, halogen lamp, and excimer lamp are preferably used from the viewpoint of balance of energy, intensity, irradiation range and the like.
[0020]
In addition, at the time of energy ray irradiation, the plastic surface is a liquid containing any one of water, hydrogen peroxide, ammonia, alcohols, organic acids and derivatives thereof, nitriles, nitro compounds, amines, and sulfur compounds. It is necessary to come into contact with .
[0021]
When the energy ray irradiation on the plastic surface is carried out in an organic solvent such as water , hydrogen peroxide, alcohol, and amines, the ability to cut the C—H bond, C—C bond, etc. on the plastic surface, A carbon group, an oxygen component, a nitrogen component, moisture, and the like form a functional group such as a hydroxyl group, an amino group, a carbonyl group, or a carboxyl group on the plastic surface, which is preferable because the hydrophilicity of the plastic surface increases.
[0022]
In addition, depending on conditions such as the energy beam irradiation atmosphere and irradiation time, cutting of plastic C—H bonds, C—C bonds and the like further proceeds, and oligomers, low molecular compounds, etc. are formed on the surface or surface irregularities are formed. It is formed, and tackiness and adhesiveness are more effectively expressed, but the conditions differ depending on the material of the adherend and the type of energy beam.
[0023]
The plastic used in the first or second adherend in the present invention has no tackiness or adhesiveness in advance, and has tackiness or adhesiveness by irradiation with energy rays, for example, Examples include polyamides, polyesters, other engineering plastics, polyolefins, styrene resins, vinyl resins, and cellulose resins, but are not limited to those exemplified above. Further, an alloy or a blended product in which various plastics or fillers are dispersed may be used.
[0024]
The form of the first and / or second adherend is arbitrary, and the first and / or second adherend includes various forms such as a film, a sheet, a fiber, and a resin molded article. It does not have to be in the form as a final product, and its shape is arbitrary. The bonding surface in the present invention is not limited to a flat surface, and the shape thereof is arbitrary.
[0025]
【Example】
Hereinafter, the present invention will be described specifically by way of examples. In each example and comparative example, the adhesion was evaluated by a 90-degree peel test. The 90 degree peel test will be described with reference to FIG. In the bonded sample prepared to a predetermined width, one second adherend 2 is placed on the movable table 11 of the adhesion measuring device. At this time, the second adherend 2 may be a bendable film or a non-bendable sheet. The other first adherend 1 is attached to the peeling jig 12 of the adhesive force measuring device. The peeling jig 12 is connected to the tension arm 15 via the load cell 13 and can measure the tensile stress (adhesive force) at the time of peeling. Further, the tensile speed at this time is constant at 300 mm / min. In addition, since the movable table 11 is attached to the tension arm 15 via a joint 14 such as a string, the movable table 11 moves to the left in the drawing by the same amount as the upward movement of the peeling jig 12. . Therefore, the first adherend 1 can be peeled from the second adherend 2 while keeping the peel angle θ at 90 degrees.
[0026]
<Example 1>
In this embodiment, a xenon lamp (UER200 / HM172; energy 7.3 eV) manufactured by Ushioyu Tech Co., Ltd. is used as the energy ray source, and a Kuraray vinylon film (# 3000) and a second adherend are used as the first adherend. A polyethylene terephthalate film (Cosmo Shine A4300) manufactured by Toyobo was used as an adherend. The method is as follows. The vinylon film and the polyethylene terephthalate film were irradiated with ultraviolet rays of 10 mW / cm ^{2 from} the xenon lamp for 200 seconds from a distance of 2 mm.
[0027]
Next, after laminating the films with a laminating pressure of 0.3 kgf / cm ² (0.03 MPa) and bonding them together, the adhesive strength between the plastics was measured by a 90-degree peel test. The adhesive strength of the film with a width of 100 mm after irradiation with the energy beam was 1.28 kgf (13 N), and it was possible to bond without using an adhesive by irradiation with the energy beam.
[0028]
<Example 2>
As in Example 1, a plate obtained by injection molding a methacrylic resin (Parapet GH-S) manufactured by Kuraray as the second adherend and a polycarbonate film (Iupilon film) manufactured by Mitsubishi Engineering Plastics as the first adherend. Were irradiated with energy rays to bond them together. The adhesive strength of the film with a width of 100 mm after irradiation with the energy beam was 0.12 kgf (1.2 N), and it was possible to bond both.
[0029]
<Example 3>
Irradiate energy rays in the same manner as in Example 1 to a board formed by injection molding of a methacrylic resin (Parapet GH-S) manufactured by Kuraray Co., Ltd. as the second adherend and an acrylic film (acrylic) manufactured by Mitsubishi Rayon as the first adherend. Then, both were adhered. The adhesive strength of the film with a width of 100 mm after irradiation with the energy beam was 0.18 kgf (1.8 N), and it was possible to bond both.
[0030]
<Example 4>
In the same manner as in Example 1, energy pellets were irradiated on a polyethylene film as a first adherend and a polyethylene film as a first adherend in the form of a pellet of ethylene ionomer (Mitsui / DuPont / Polychemical HiMilan 1555). , Both were adhered. The adhesive strength of the film with a width of 100 mm after irradiation with the energy beam was 0.34 kgf (3.3 N), and it was possible to bond both.
[0031]
<Example 5>
The film obtained by extruding the acrylic core-shell fine particles as the first adherend and the polyurethane sheet (Kuraray TPU Clamiron U3190) as the second adherend are irradiated with energy rays in the same manner as in Example 1 to bond them together. It was. The adhesive strength of the film with a width of 100 mm after irradiation with the energy beam was 0.08 kgf (0.78 N), and it was possible to bond both.
[0032]
<Example 6>
As the first and second adherends, a sheet made of a styrene elastomer compound (Septon CPD KC009A made by Kuraray Plastics) was used and irradiated with energy rays in the same manner as in Example 1 to bond them together. The adhesive strength of the sheet having a width of 100 mm after the irradiation with the energy beam was 0.10 kgf (0.98 N), and it was possible to bond them together.
[0033]
<Example 7>
Energy rays were applied to the triacetyl cellulose film (Fuji Photo Film Fujitac UV-CM, 80 μm) as the first adherend and the Kuraray vinylon film (# 3000) as the second adherend in the same manner as in Example 1. Irradiated to bond them together. The adhesive strength of the film 10 mm width after irradiation with the energy beam was 0.08 kgf (0.78 N), and it was possible to bond both.
[0034]
<Example 8>
An acrylic rayon film (Acryprene) made by Mitsubishi Rayon as the first adherend was irradiated with energy rays in the same manner as in Example 1 and adhered to the glass plate as the second adherend. The adhesive strength of the film with a width of 100 mm after irradiation with the energy beam was 0.05 kgf (0.49 N), and it was possible to bond both.
[0035]
<Example 9>
In this example, a corona discharge device manufactured by Navitas Co., Ltd. was used for surface modification. The method of surface modification is as follows. As a first adherend, a plate obtained by injection molding of methacrylic resin (Parapet GH-S) manufactured by Kuraray Co., Ltd. was used, and the distance from the corona discharge device was 5 mm by a corona discharge with an energy of 5.0 eV, and the line speed was 100 mm / Treated in air as seconds. As the second adherend, an optical film having a microprism array-like uneven pattern was used. The optical film was produced as follows. The nickel plate on which the inverted shape of the concavo-convex pattern is formed is used as a mold, and the mold is filled with an acrylate photocurable resin (Kayarad) manufactured by Nippon Kayaku Co., Ltd., based on a polycarbonate film having a thickness of 0.2 mm. The optical film was obtained by photocuring the photocurable resin as a material film. The adhesion area ratio at the top of the concave-convex pattern in the optical film was 30%.
The optical film and the surface-modified light guide were laminated at a lamination pressure of 0.3 kgf / cm ² (0.03 MPa). When the adhesive strength was measured by a 90-degree peel test in the same manner as in Example 1, the adhesive strength of the optical film having a width of 50 mm was 0.06 kgf (0.59 N), and it was possible to bond the two.
[0036]
<Comparative Examples 1-8>
In Examples 1 to 8, the energy ray source is changed to a xenon lamp (UER200 / HM172; energy 7.3 eV) manufactured by Ushioyu Tech Co., Ltd., and high pressure mercury manufactured by Ushio Electric Co., Ltd. that generates ultraviolet light of energy 3.5 eV. Except for the lamp (UM452), lamination was performed in the same manner as in Examples 1 to 8, and the adhesion was measured by a 90-degree peel test. As a result, the adhesive strength with a width of 100 mm was less than 0.01 kgf (0.10 N) in any case and did not show sufficient adhesiveness.
[0037]
<Comparative Examples 9-16>
Lamination was carried out in the same manner as in Examples 1 to 8 except that the energy beam was not irradiated, and an attempt was made to measure the adhesive strength by a 90-degree peel test.
[0038]
【The invention's effect】
According to the present invention, it is possible to easily adhere even an adherend such as plastic that does not have tackiness in advance without using an adhesive.
[Brief description of the drawings]
[Fig. 1] Explanation of 90 degree peel test [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st adherend 2 2nd adherend 11 Movable table 12 Base material peeling jig 13 Load cell 14 Joining part 15 Pull arm

Claims (6)

In a plastic bonding method for bonding a first adherend made of plastic and a second adherend, an energy ray having energy of 4 eV or more is applied to at least a bonding surface of the plastic that is the first adherend . Irradiation in a state where the adherend is in contact with a liquid containing any one of water, hydrogen peroxide, ammonia, alcohols, organic acids and derivatives thereof, nitriles, nitro compounds, amines, and sulfur compounds And the step of adhering the first adherend and the second adherend without using an adhesive, the first adherend and the second adherend being tacky before irradiation with energy rays Alternatively, the plastic is characterized in that it has no adhesiveness, and the first adherend is capable of obtaining adhesiveness or adhesiveness by irradiation with energy rays. Chakuhoho.   The method for adhering plastic according to claim 1, wherein the second adherend is plastic.   3. The method of bonding plastics according to claim 2, wherein energy beams having an energy of 4 eV or more are irradiated on both bonding surfaces of the first adherend and the second adherend.   4. The plastic bonding method according to claim 1, wherein the energy beam to be irradiated is any one selected from ultraviolet rays, corona discharge, electron beams, and ion beams. Energy beam D ₂ lamp for irradiating, a high pressure mercury lamp, low pressure mercury lamp, Xe lamp, Hg-Xe lamp, according to claim claims, characterized in that a UV obtained by any one selected from the halogen lamp and an excimer lamp 4. The method for bonding plastics according to 1 or 3.   The plastic according to any one of claims 1 to 5, wherein the first adherend is preheated before energy beam irradiation, or energy beam irradiation is performed while heating the first adherend. Bonding method.

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