JP5023535B2 - Adhesive sheet - Google Patents

Description

  The present invention relates to an adhesive sheet for adhering an adherend.

  The parts of industrial products are made of materials such as metals, resins, ceramics, and the like, and conventionally, reactive adhesives, pressure-sensitive adhesives, and the like are used for bonding parts of industrial products of the same or different materials. As the reactive adhesive, a two-component mixed resin, a thermosetting resin, an ultraviolet curable resin, or the like is used. As shown in Patent Document 1, a reactive adhesive applied between two adherends is cured by reaction with a curing agent, reaction by heating, reaction by ultraviolet irradiation, or the like. Thereby, two to-be-adhered objects are adhere | attached.

Moreover, the double-sided adhesive sheet etc. which have an acrylic resin, an epoxy resin, etc. in an adhesion layer are used as an adhesive. As shown in Patent Document 2, the pressure-sensitive adhesive sheet is stuck on one adherend, and after the release paper is peeled off, the other adherend is pressure-bonded. Thereby, two adherends are bonded.
Japanese Patent Laid-Open No. 2001-115125 (page 3 to page 6, FIG. 1) Japanese Patent Laid-Open No. 6-17011 (pages 3 to 4 and FIG. 7)

  However, when a reactive adhesive is used for bonding an object to be bonded, an application process is required, and the bonding process becomes complicated. Further, there is a problem that the chemical resistance is low and the strength deteriorates in an environment where the chemical is used. When a pressure-sensitive adhesive is used for bonding the adherend, there is a problem that the solvent component remains in the pressure-sensitive adhesive layer and erodes the adherend. Further, there is a problem that the water resistance and oil resistance are low, and the strength deteriorates after long-term use.

  An object of the present invention is to provide an adhesive sheet that has no residual solvent, is excellent in chemical resistance, water resistance and oil resistance, and can adhere an adherend in a simple process.

  In order to achieve the above object, the present invention provides an adhesive layer made of an acid-modified polyolefin that is melted by heat and adhered to the adherend, and is peeled after the adhesive layer is laminated to the adherend and adhered to the adherend. And a base material made of a heat-resistant resin.

  According to this configuration, the adhesive layer made of acid-modified polyolefin is placed on one adherend, and when the adhesive layer melted by heating comes into close contact with the adherend, the substrate is peeled off. Thereby, the adhesive layer is transferred onto the adherend. Thereafter, the other adherend is pressure-bonded onto the adhesive layer, and when the adhesive layer is cooled to room temperature, it is cured and the two adherends are bonded.

  According to the present invention, in the adhesive sheet configured as described above, the heat resistant resin is made of polyethylene terephthalate.

  Moreover, the present invention is characterized in that, in the adhesive sheet having the above-described configuration, a plurality of the adhesive layers having the same shape are arranged on the substrate at predetermined intervals. According to this structure, a base material is sent at predetermined intervals and each adhesive layer is transferred to a plurality of adherends in order.

  According to the present invention, in the adhesive sheet having the above-described configuration, positioning holes are provided in the base material at predetermined intervals. According to this configuration, the base material is positioned at predetermined intervals by inserting pins or the like into the positioning holes, and each adhesive layer is transferred at the same position.

  According to the present invention, in the adhesive sheet having the above-described configuration, a through-hole penetrating the adhesive layer and the base material is provided. According to this configuration, the cylindrical adherend is bonded by the adhesive sheet.

  According to the present invention, since the adhesive layer made of acid-modified polyolefin is provided, the adherend can be easily bonded by heat fusion. In addition, since acid-modified polyolefin has no residual solvent and is excellent in chemical resistance, water resistance and oil resistance, the adhesive strength can be maintained for a long time. Moreover, since the base material made of a heat resistant resin is laminated on the adhesive layer, the adhesive layer can be easily melted by heat.

  Further, according to the present invention, since the heat resistant resin is made of polyethylene terephthalate, the strength is high and the handling in the bonding process becomes easy.

  Further, according to the present invention, since the plurality of adhesive layers having the same shape are arranged on the base material at predetermined intervals, the adhesive layer can be easily transferred to the plurality of adherends by feeding the base material. .

  According to the present invention, since the positioning holes are provided in the base material at predetermined intervals, the base material can be easily positioned at predetermined intervals.

  According to the present invention, since the through-hole penetrating the adhesive layer and the substrate is provided, the cylindrical adherend can be easily adhered.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a plan view and a cross-sectional view showing an adhesive sheet according to an embodiment. In the adhesive sheet 10, an adhesive layer 12 made of acid-modified polypropylene (PPa) is laminated on a base material 11 made of polyethylene terephthalate (PET).

  The base material 11 is formed in a tape shape having a thickness of about 50 μm, and positioning holes 10a are formed at a predetermined interval T in the longitudinal direction. A plurality of adhesive layers 12 are arranged on the substrate 11 at intervals T, and each adhesive layer 12 is formed in the same shape. Further, a through hole 10 b that penetrates the base material 11 and the adhesive layer 12 is provided. A cylindrical adherend can be easily bonded by the through hole 10b.

  The acid-modified polypropylene is melted by heating, and the acid-modified polypropylene melted on the substrate 11 is applied by extrusion with a T-die extruder. The acid-modified polypropylene applied on the base material 11 is sandwiched and fed together with the base material 11 by a roll. Thereby, the adhesive layer 12 having a thickness of about 50 μm can be easily formed.

  It is possible to easily form the positioning hole 10a and the through hole 10b by laminating the adhesive layer 12 on the base material 11 and then punching it by press working. Further, the adhesive layer 12 can be formed into a desired shape by half-cutting from the adhesive layer 12 side. Unnecessary portions of the adhesive layer 12 are removed by being wound with a roll or the like.

  FIG. 3 is a diagram showing an adhesion process for adhering an object to be adhered made of electronic device parts or the like using the adhesive sheet 10. 1 is different from the adhesive sheet 10 shown in FIG. 1 in that the planar shape of the adhesive layer 12 is different, and two adhesive layers 12 having different adjacent shapes are used as one set, and each set is arranged at a distance T.

  The first adherend W1 is fed on the conveyor 20. The adhesive sheet 10 is wound around a supply roll 21 and fed by a feed roll 22 and a positioning roll 23. A pin 23 a is projected from the positioning roll 23 and is fitted into the positioning hole 10 a of the adhesive sheet 10 so that the adhesive layer 12 is positioned below the heater 24. At this time, the adhesive layer 12 is disposed below the substrate 11.

  When the first adherend W1 is positioned below the heater 24 by the conveyor 20, the heater 24 is lowered and the adhesive sheet 10 is pressed against the first adherend W1. The adhesive sheet 10 is heated by the heater 24, and the adhesive layer 12 is melted to adhere to the first adherend W1. The base material 11 does not melt because it has heat resistance.

  The first adherend W1 and the adhesive sheet 10 are fed together by a conveyor 20, a feed roll 22 and a positioning roll 23. The substrate 11 is wound upward from the positioning roll 23 by the winding roll 25. Thereby, the base material 11 is peeled from the adhesive layer 12, and the adhesive layer 12 is transferred to the first adherend W1.

  The first adherend W1 to which the adhesive layer 12 has been transferred is sent by the conveyor 20, and the second adherend W2 is placed at a predetermined position. When the first and second adherends W1 and W2 are disposed below the heater 26, the heater 26 is lowered and the second adherend W2 is pressed against the first adherend W1. Thereby, the adhesive layer 12 melts and adheres to the second adherend W2. When the adhesive layer 12 is cooled, the adhesive layer 12 is cured, and a product W in which the first and second adherends W1 and W2 are bonded is completed.

  The substrate 11 may be any heat-resistant resin having heat resistance, such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polymethylpentene (TPX (registered trademark)), polyacetal ( Non-stretched or stretched films such as POM), cyclic polyolefin, and polypropylene (PP) can be used. Polyethylene terephthalate is more desirable because it is inexpensive and has high strength, so that it can be easily handled in the bonding process. Further, a known release agent may be provided between the base material 11 and the adhesive layer 12 to adjust the peel strength between the base material 11 and the adhesive layer 12.

  Table 1 shows the results of measuring the adhesive strength of acid-modified polypropylene. The change with time was measured in (a) a dry state at 60 ° C., (b) a state maintained at 60 ° C. with a humidity of 90%, and (c) a state immersed in machine oil at 60 ° C.

  As shown in FIG. 4, the test piece S was obtained by laminating acid-modified polypropylene (PPa) on a base material obtained by laminating aluminum (AL) on a biaxially stretched nylon film (ONy). Thereby, peeling between a base material and acid-modified polypropylene is prevented. As a measuring method, the test piece S was bonded to the ferrite alloy F, and a tensile test was performed at a speed of 50 mm / min. The bonding condition was heated to 200 ° C. and pressurized with a pressure of 1 MPa for 20 seconds.

  As shown in Table 1, it has a high adhesive strength of about 30 N per 15 mm width under each condition. Further, the adhesive strength hardly changes with time and has water resistance and oil resistance.

  The adhesive layer 12 is not limited to acid-modified polypropylene, and the same adhesive strength can be maintained as long as it is an acid-modified polyolefin. Moreover, acid-modified polyolefin has the same high adhesive strength with respect to resin and ceramic, and has high chemical resistance.

  According to the present embodiment, since the adhesive layer 12 made of acid-modified polyolefin such as acid-modified polypropylene is provided, the first and second adherends W1 and W2 can be easily bonded by heat fusion. Moreover, high adhesive strength can be obtained with respect to adhesion of the same kind of materials such as metal, resin, ceramic, and different kinds of materials. Furthermore, since the acid-modified polyolefin has no residual solvent and is excellent in chemical resistance, water resistance and oil resistance, the adhesive strength can be maintained for a long time. In addition, since the base material 11 made of a heat resistant resin is laminated on the adhesive layer 12, the adhesive layer 12 can be easily melted by heat.

  In addition, since the plurality of adhesive layers 12 having the same shape are arranged on the base material 11 at a predetermined interval T, the base material 11 is fed to easily transfer the adhesive layer 12 to the plurality of first adherends W1. be able to. Further, by providing the positioning holes 11 a in the adhesive sheet 12, the base material 11 can be easily positioned at a predetermined interval T.

  According to this invention, it can utilize for the adhesive sheet which adhere | attaches adherends, such as components (for example, magnet mounted in a motor) of industrial products.

The top view which shows the adhesive sheet of embodiment of this invention Sectional drawing which shows the adhesive sheet of embodiment of this invention Schematic which shows the adhesion | attachment process of the to-be-adhered object by the adhesive sheet of embodiment of this invention. The figure which shows the measuring method of the adhesive strength of the adhesive sheet of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Adhesive sheet 10a Positioning hole 10b Through-hole 11 Base material 12 Adhesive layer 20 Conveyor 21 Supply roller 22 Feed roller 23 Positioning roller 24, 26 Heater 25 Take-up roller W Product W1 First adherend W2 Second adherend

Claims (7)

It consists of a single-layer adhesive layer made of acid-modified polyolefin that is melted by heat and adheres to the adherend, and a heat-resistant resin that is peeled after being directly laminated on the adhesive layer and adhering the adhesive layer to the adherend. An adhesive sheet comprising a substrate.   The adhesive sheet according to claim 1, wherein the heat resistant resin is made of polyethylene terephthalate.   The adhesive sheet according to claim 1 or 2, wherein a plurality of the adhesive layers having the same shape are arranged on the substrate at predetermined intervals.   The adhesive sheet according to claim 3, wherein positioning holes are provided in the base material at predetermined intervals.   The adhesive sheet according to any one of claims 1 to 4, wherein a through-hole penetrating the adhesive layer and the base material is provided. The adhesive sheet according to any one of claims 3 to 5, wherein the adhesive layer is formed into a desired shape by half-cutting. The molten acid-modified polyolefin is extrusion-coated on a base material made of a heat-resistant resin, a single-layer adhesive layer is directly laminated on the base material, and the adhesive layer is half-cut to form a desired shape. A plurality of adhesive layers having the same shape are arranged on a material at predetermined intervals, positioning holes are provided on the base material at predetermined intervals, and through holes penetrating the adhesive layer and the base material are provided. Manufacturing method of adhesive sheet.

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