JP2018021695A - Pressure sensitive adhesive tape for fixing refrigerator heat pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure sensitive adhesive tape for fixing a refrigerator heat pipe, which prevents breakage when adhering to adherends such as a heat pipe and a support, and has high heat conductivity.SOLUTION: A pressure sensitive adhesive tape 10A for fixing a refrigerator heat pipe is configured such that a metal foil 1 and a base material film 2 as a polyolefin film are laminated through an adhesive layer 6, and a pressure sensitive adhesive layer 3 is laminated on the base material film 2 side. A thickness of the metal foil 1 is 5-15 μm, a lamination thickness of the metal foil 1, the adhesive layer 6 and the base material film 2 is 25-35 μm, a lamination thickness of the metal foil 1, the adhesive layer 6, the base material film 2 and the pressure sensitive adhesive layer 3 is equal to or less than 55 μm. With the adhesive tape 10A for fixing the refrigerator heat pipe, an aluminum pipe 8 is fixed to an epoxy-coated steel plate 9.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an adhesive tape for fixing a refrigerator heat pipe.

  Conventionally, in order to fix the meandering heat pipe for releasing the heat in the refrigerator to the outside to the outer surface of a support such as a side panel or a rear panel constituting the refrigerator housing, a metal foil, A refrigerator heat pipe fixing adhesive tape (hereinafter referred to as an adhesive tape) comprising an adhesive layer formed on one side of a metal foil is used. The adhesive tape preferably has high thermal conductivity on the adhesive surface of the heat pipe with the adhesive tape so as not to hinder heat dissipation of the heat pipe.

  The metal foil adhesive tape described in Patent Document 1 has an adhesive layer formed on one side of an aluminum foil (thickness: 80 μm). In the heat transfer tape described in Patent Document 2, adhesive layers are alternately formed on one surface of an aluminum foil (thickness: 50 μm) so as to have a thick film thickness and a thin film thickness.

  Moreover, it is technically difficult to apply the adhesive directly to the metal foil only, and the commercially available metal foil adhesive tape has a metal foil, a separator coated with the adhesive, and the metal foil and the adhesive. As described above, the metal foil and the separator are usually laminated (so-called transfer coating).

Japanese Utility Model Publication No. 3-77180 Japanese Examined Patent Publication No. 62-10590

  In order to maintain high thermal conductivity between the adhesive tape and the heat pipe, it is important that the adhesive tape and the heat pipe are in close contact with each other. On the other hand, both the one described in Patent Document 1 and the one described in Patent Document 2 lack the flexibility because the metal foil is thick, and the bonding work to the heat pipe is difficult. Skill is required to bring the air tightly into a state where it is difficult and wrinkles are not generated and air bubbles are embraced in the contact surface. Furthermore, when the adhesive tape is bonded to the heat pipe and fixed to the support in the state where wrinkles or bubbles are generated, the thermal conductivity of the adhesive tape receiving heat transfer from the heat pipe and radiating to the outside is reduced. It is the cause.

  Since the aluminum foil is thick as described in Patent Document 1, as shown in FIG. 1 of Patent Document 1, the semi-circumferential surface is adhered to the condensed pipe, and the adhesive tape and the heat pipe are bonded together. A large space that does not participate in heat conduction is formed between the support and the space, which causes the adhesive tape to reduce heat conductivity that is radiated on the outer surface by receiving heat transfer from the heat pipe.

  Therefore, in order to make the space formed between the adhesive tape, the heat pipe, and the support as small as possible, the thickness of the metal foil is reduced for the one described in Patent Document 1, and the above-mentioned space If the adhesive tape is to be bonded to the heat pipe so as not to be formed, there is a problem that the adhesive tape is torn as shown in FIG. This is substantially the same as that described in Patent Document 2 and the above-described commercially available metal foil adhesive tape.

  Moreover, the commercially available metal foil pressure-sensitive adhesive tape described above has a problem in that it is necessary to peel off the separator when the metal foil pressure-sensitive adhesive tape is attached to the heat pipe, and the workability is poor, and further, the separator comes out as dust.

  The present invention has been made in view of the above-described problems, and provides a refrigerator heat pipe fixing pressure-sensitive adhesive tape that is not torn when being attached to an adherend such as a heat pipe and a support and has high thermal conductivity. The purpose is that.

  In order to solve the above problems, the refrigerator heat pipe fixing pressure-sensitive adhesive tape according to the present invention has a metal foil and a base film laminated via an adhesive layer, and a pressure-sensitive adhesive layer laminated on the base film side. It is a pressure-sensitive adhesive tape for fixing a refrigerator heat pipe, wherein the thickness of the metal foil is 5 to 15 μm, the lamination thickness of the metal foil, the adhesive layer and the base film is 25 to 35 μm, and is bonded to the metal foil. The laminated thickness of the agent layer, the base film and the pressure-sensitive adhesive layer is 55 μm or less.

  With this configuration, the pressure-sensitive adhesive tape for fixing a refrigerator heat pipe according to the present invention has a metal foil having a thickness of 5 to 15 μm laminated on a base film via an adhesive layer, and the metal foil, the adhesive layer, and the base film When the laminate thickness of the metal foil, the adhesive layer, the base film, and the pressure-sensitive adhesive layer is 55 μm or less, it is attached to an adherend such as a heat pipe and a support. It is not broken and has higher thermal conductivity than the conventional one. That is, the pressure-sensitive adhesive tape for fixing a refrigerator heat pipe according to the present invention is not easily torn because the base film and the metal foil are laminated, and has a high thermal conductivity because the tape thickness is thin.

  Moreover, it is preferable that the pressure-sensitive adhesive tape for fixing a refrigerator heat pipe according to the present invention has a configuration in which a release agent layer is laminated on the metal foil side and wound in a roll shape.

  With this configuration, the refrigerator heat pipe fixing pressure-sensitive adhesive tape according to the present invention is formed by laminating the release agent layer on the metal foil side and winding it into a roll shape, so that the refrigerator heat pipe fixing tape can be used as a heat pipe and a support. There is no need to remove the separator when affixing to the adherend, the workability is improved, and the separator does not come out as dust.

  ADVANTAGE OF THE INVENTION According to this invention, when sticking to a heat pipe and a support body, it is not torn and can provide the adhesive tape for refrigerator heat pipe fixation with high heat conductivity.

It is typical sectional drawing of the adhesive tape for refrigerator heat pipe fixation with a separator which concerns on embodiment of this invention. 1 is a schematic cross-sectional view of a separatorless refrigerator heat pipe fixing adhesive tape according to an embodiment of the present invention. It is the schematic diagram which looked at the perforated plastic film used for the adhesive tape for refrigerator heat pipe fixation which concerns on embodiment of this invention from the top. It is typical sectional drawing (AA sectional drawing of FIG. 3) of the perforated plastic film used for the adhesive tape for refrigerator heat pipe fixation which concerns on embodiment of this invention. It is typical sectional drawing of the state which fixed the aluminum pipe to the coated steel plate using the refrigerator heat pipe fixing adhesive tape which concerns on embodiment of this invention. It is the photograph which image | photographed the state which fixed the aluminum pipe to the coated steel plate using the adhesive tape for refrigerator heat pipe fixation which concerns on embodiment of this invention from the horizontal direction. A photograph of the tear that occurred in the adhesive tape when the metal foil was thinned and pasted so that no space was created between the refrigerator heat pipe and the support for the structure described in Patent Document 1. It is.

  Hereinafter, an adhesive tape for fixing a refrigerator heat pipe according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a refrigerator heat pipe fixing pressure-sensitive adhesive tape 10 with a separator according to an embodiment of the present invention is formed by laminating a metal foil 1 and a base film 2 that is a polyolefin film via an adhesive layer 6. The pressure-sensitive adhesive layer 3 is laminated on the base film 2 side. The base film 2 has a plurality of perforated portions 2a penetrating in the thickness direction.

  The adhesive layer 6 is an adhesive applied to the metal foil 1 or the base film 2. The perforated part 2 a of the base film 2 is filled with the same pressure-sensitive adhesive 3 a as the pressure-sensitive adhesive layer 3. Therefore, the metal foil 1 and the pressure-sensitive adhesive layer 3 are bonded via the pressure-sensitive adhesive 3a inside the perforated part 2a.

  The refrigerator heat pipe fixing pressure-sensitive adhesive tape 10 has a separator 4 laminated on the surface of the pressure-sensitive adhesive layer 3 located on the opposite side of the base film 2.

  As shown in FIG. 2, a separatorless refrigerator heat pipe fixing adhesive tape 10 </ b> A according to an embodiment of the present invention is formed by laminating a metal foil 1 and a base film 2, which is a polyolefin film, via an adhesive layer 6. The pressure-sensitive adhesive layer 3 is laminated on the base film 2 side. The base film 2 has a plurality of perforated portions 2a penetrating in the thickness direction.

  The adhesive layer 6 is an adhesive applied to the metal foil 1 or the base film 2. The perforated part 2 a of the base film 2 is filled with the same pressure-sensitive adhesive 3 a as the pressure-sensitive adhesive layer 3. Therefore, the metal foil 1 and the pressure-sensitive adhesive layer 3 are bonded via the pressure-sensitive adhesive 3a inside the perforated part 2a.

  The refrigerator heat pipe fixing pressure-sensitive adhesive tape 10 </ b> A has a release agent layer 5 laminated on the surface of the metal foil 1 that is opposite to the base film 2.

  Although the material of the metal foil 1 is not specifically limited, Well-known things, such as gold foil, silver foil, copper foil, aluminum foil, can be used. The metal foil 1 is more preferably a copper foil or an aluminum foil in view of thermal conductivity and cost. The metal foil 1 has a thickness in the range of 5 to 15 μm.

  As shown in FIGS. 3 and 4, the base film 2 can be a soft packaging film. The base film 2 may be either one with or without perforation. The preferred flexible packaging film for use as the substrate film 2 is preferably one that is selected from a polyethylene film, a polypropylene film, or a polyethylene terephthalate film and stretched. However, the present invention is not limited to these three types of films. Other than the nylon 6 film, nylon 66 film, polyvinyl chloride film, ethylene-methacrylic acid copolymer film, polybutylene terephthalate film, polycarbonate film, etc. One type may be selected.

  The base film 2 may be subjected to a surface treatment that improves known wettability such as corona treatment or primer treatment, if necessary. The thickness of the base film 2 is set so that the laminated thickness of the metal foil 1, the adhesive layer 6, and the base film 2 is 25 to 35 μm.

  The perforated part 2a of the base film 2 is perforated by a known method. As the drilling method, hot needle drilling, thermal spray energy drilling, needle drilling, laser drilling, and the like can be applied, and there is no particular limitation. Although the hole diameter of the perforated part 2a is not particularly limited, it is preferably 0.3 to 2.0 mm. The total area (open area ratio) of the perforated part 2a after perforation when the film area before perforation is 100 is preferably 2 to 20% because the substrate strength tends to decrease as the total area increases. , More preferably 3 to 15%, still more preferably 5 to 10%.

  The adhesive for laminating the metal foil 1 and the base film 2 is not particularly limited, but polyester adhesive, polyether adhesive, polyurethane adhesive, epoxy adhesive, acrylic adhesive, cyanoacrylate adhesive Agent, silicone adhesive, modified silicone adhesive, silylated urethane adhesive, polyimide adhesive, polybenzimidazole adhesive, vinyl acetate adhesive, vinyl chloride adhesive, polymethacrylate adhesive, It is preferable to use a polystyrene-based adhesive, a urea-based adhesive, a melamine-based adhesive, or a phenol-based adhesive. The thickness of the adhesive layer 6 is 2 to 3 μm.

  A known pressure-sensitive adhesive is used for the pressure-sensitive adhesive layer 3 and is not particularly limited. For the pressure-sensitive adhesive layer 3, for example, a metal powder mixed with a pressure-sensitive adhesive may be used. The pressure-sensitive adhesive is not particularly limited, but an acrylic pressure-sensitive adhesive is preferably used in terms of weather resistance.

  As the metal powder, gold powder, silver powder, copper powder, aluminum powder, nickel powder, chromium powder, cobalt powder, tin powder, zinc powder or the like is used. The addition amount of the metal powder is preferably 20 to 60 parts by weight, more preferably 30 to 50 parts by weight with respect to 100 parts by weight of the pressure-sensitive adhesive.

  The separator 4 can use a well-known thing, and is not specifically limited. For the separator 4, for example, a plastic film subjected to silicone treatment, polylaminated paper subjected to silicone treatment, glassine paper subjected to silicone treatment, or the like can be used.

  A known release agent is used for the release agent layer 5 and is not particularly limited. As the release agent, a silicone release agent, a long chain alkyl release agent, or the like may be used, and a long chain alkyl release agent is preferably used.

  In the refrigerator heat pipe fixing pressure-sensitive adhesive tape 10, 10 </ b> A according to the present embodiment, a metal foil 1 having a thickness of 5 to 15 μm is laminated on a base film 2 via an adhesive layer 6, and the metal foil 1 and an adhesive layer 6 and the base film 2 have a laminated thickness of 25 to 35 μm, and the laminated thickness of the metal foil 1, the adhesive layer 6, the base film 2 and the pressure-sensitive adhesive layer 3 is 55 μm or less. It is not torn when it is attached to an adherend such as a body, and has higher thermal conductivity than the conventional one as will be described later.

  Further, the refrigerator heat pipe fixing adhesive tape 10A according to the present embodiment is obtained by laminating the release agent layer 5 on the metal foil 1 side and winding it in a roll shape. There is no need to peel off the separator when affixing to an adherend such as a support, workability is improved, and the separator does not come out as dust.

  Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples.

The specification of the material of the adhesive tape for fixing the refrigerator heat pipe is as follows.
Metal foil: Aluminum foil Base film: Biaxially stretched polypropylene film Perforation method: Thermal spray energy perforation method Adhesive: Dry lamination adhesive Adhesive: Acrylic adhesive Metal powder: Trade name Nickel Powder Type 255 Vale Japan Co., Ltd. average grain Nickel powder having a diameter of 2.2 to 2.8 μm and an apparent density of 0.50 to 0.65 g / cc Stripping agent: Trade name Pyroyl HT Long chain alkyl acrylic copolymer manufactured by Yasushi Oil Industries Co., Ltd.

  Example 1: A biaxially-stretched polypropylene film treated with double-sided corona treatment with a hole diameter (0.4 mm) and a hole area ratio of 7.8% and a thickness of 15 μm, and an aluminum foil with a thickness of 7 μm and a thickness of 3 μm. Adhesion was performed with a dry lamination adhesive and laminated. At this time, the dry lamination adhesive was applied to the film side. A long-chain alkyl acrylic copolymer is laminated on the aluminum foil side as a release agent layer so as to have a coating amount of 0.05 g / m 2, and nickel powder 30 on the film side with respect to 100 parts by weight of the acrylic pressure-sensitive adhesive. A pressure-sensitive adhesive containing parts by weight was laminated at a thickness of 20 μm, wound around a paper tube, and cut into a width of 50 mm to obtain a sample.

  In Example 1, the thickness of the metal foil is 7 μm, the lamination thickness of the metal foil, the adhesive layer, and the base film is 25 μm, and the lamination of the metal foil, the adhesive layer, the base film, and the pressure-sensitive adhesive layer. The thickness is 45 μm.

  As shown in FIG. 5, the sample of Example 1 was used as the refrigerator heat pipe fixing adhesive tape 10 </ b> A, and an aluminum pipe (wall thickness: 0.5 mm) 8 having an outer diameter of 10 mm was fixed to the epoxy-coated steel sheet 9. Here, the aluminum pipe 8 and the epoxy-coated steel plate 9 are adherends.

  A pressure-sensitive adhesive tape 10A for fixing a refrigerator heat pipe made of the sample of Example 1 is formed by laminating a metal foil 1 having a thickness of 7 μm on a base film 2 having a thickness of 15 μm via an adhesive layer 6 having a thickness of 3 μm. Since the lamination thickness of the agent layer 6 and the base film 2 is 25 μm and the lamination thickness of the metal foil 1, the adhesive layer 6, the base film 2 and the pressure-sensitive adhesive layer 3 is 45 μm, the aluminum pipe 8 and the epoxy Good adhesion to the coated steel plate 9 was observed and no tearing occurred as shown in FIG.

  Also, using the sample of Example 1, the adhesive layer was attached to the upper surface of a 0.8 mm thick stainless steel plate, the stainless steel plate was placed on the Peltier element cooling unit, and the temperature of the Peltier element cooling unit was adjusted. The thermal conductivity evaluation test is performed by a method in which the temperature is lowered from 23 ° C. at a rate of 6 ° C. per minute and measured at the surface temperature of the metal foil (aluminum foil) immediately after the temperature of the Peltier element cooling unit reaches 5 ° C. Carried out. When this evaluation test was carried out three times, the average value of the measured surface temperature of the metal foil was 5.3 ° C.

  Example 2 A biaxially stretched polypropylene film having a thickness of 15 μm and an aluminum foil having a thickness of 7 μm similar to those in Example 1 were bonded and laminated with a dry lamination adhesive having a thickness of 3 μm. In the same manner as in Example 1, a long-chain alkyl acrylic copolymer was laminated on the aluminum foil side as a release agent layer so as to have a coating amount of 0.05 g / square meter, and further, an acrylic type containing no metal powder on the film side. A pressure-sensitive adhesive was laminated at a thickness of 20 μm, wound around a paper tube, and cut into a width of 50 mm to obtain a sample. The difference between Example 1 and Example 2 is that Example 1 contains metal powder in the adhesive, whereas Example 2 does not contain metal powder in the adhesive.

  In Example 2, the thickness of the metal foil is 7 μm, the lamination thickness of the metal foil, the adhesive layer, and the base film is 25 μm, and the lamination of the metal foil, the adhesive layer, the base film, and the pressure-sensitive adhesive layer. The thickness is 45 μm.

  As shown in FIG. 5, the sample of Example 2 was used as the refrigerator heat pipe fixing adhesive tape 10 </ b> A, and an aluminum pipe (wall thickness: 0.5 mm) 8 having an outer diameter of 10 mm was fixed to the epoxy-coated steel sheet 9. Here, the aluminum pipe 8 and the epoxy-coated steel plate 9 are adherends.

  A pressure-sensitive adhesive tape 10A for fixing a refrigerator heat pipe made of the sample of Example 2 is formed by laminating a metal foil 1 having a thickness of 7 μm on a base film 2 having a thickness of 15 μm via an adhesive layer 6 having a thickness of 3 μm. Since the lamination thickness of the agent layer 6 and the base film 2 is 25 μm and the lamination thickness of the metal foil 1, the adhesive layer 6, the base film 2 and the pressure-sensitive adhesive layer 3 is 45 μm, the aluminum pipe 8 and the epoxy Good adhesion to the coated steel plate 9 was observed and no tearing occurred as shown in FIG.

  Moreover, when the thermal conductivity evaluation test by the method mentioned above was implemented 3 times using the sample of Example 2, the average value of the surface temperature of the measured metal foil was 5.4 degreeC.

  Example 3: A biaxially stretched polypropylene film treated with double-sided corona treatment with a hole diameter (0.4 mm) and a hole area ratio of 7.8% and a thickness of 20 μm, and an aluminum foil with a thickness of 12 μm and a thickness of 3 μm. Adhesion was performed with a dry lamination adhesive and laminated. At this time, the dry lamination adhesive was applied to the film side. A long-chain alkyl acrylic copolymer is laminated on the aluminum foil side as a release agent layer so as to have a coating amount of 0.05 g / m 2, and nickel powder 30 on the film side with respect to 100 parts by weight of the acrylic pressure-sensitive adhesive. A pressure-sensitive adhesive containing parts by weight was laminated at a thickness of 20 μm, wound around a paper tube, and cut into a width of 50 mm to obtain a sample.

  In Example 3, the thickness of the metal foil is 12 μm, the lamination thickness of the metal foil, the adhesive layer, and the base film is 35 μm, and the lamination of the metal foil, the adhesive layer, the base film, and the pressure-sensitive adhesive layer The thickness is 55 μm.

  As shown in FIG. 5, the sample of Example 3 was used as the refrigerator heat pipe fixing adhesive tape 10 </ b> A, and an aluminum pipe (wall thickness: 0.5 mm) 8 having an outer diameter of 10 mm was fixed to the epoxy-coated steel sheet 9. Here, the aluminum pipe 8 and the epoxy-coated steel plate 9 are adherends.

  The pressure-sensitive adhesive tape 10A for fixing a refrigerator heat pipe made of the sample of Example 3 has a metal foil 1 having a thickness of 12 μm laminated on a base film 2 having a thickness of 20 μm via an adhesive layer 6 having a thickness of 3 μm. Since the lamination thickness of the agent layer 6 and the base film 2 is 35 μm, and the lamination thickness of the metal foil 1, the adhesive layer 6, the base film 2 and the pressure-sensitive adhesive layer 3 is 55 μm, the aluminum pipe 8 and the epoxy Good adhesion to the coated steel plate 9 was observed and no tearing occurred as shown in FIG.

  Moreover, when the heat conductivity evaluation test by the method mentioned above was implemented 3 times using the sample of Example 3, the average value of the surface temperature of the measured metal foil was 6.0 degreeC.

  Comparative Example 1: A commercially available aluminum adhesive tape for fixing a heat-dissipating pipe with a separator in which an acrylic adhesive was laminated at a thickness of 50 μm on an aluminum foil having a thickness of 50 μm was used as a sample.

  The aluminum pipe was fixed to the epoxy-coated steel sheet in the same manner as the samples of Examples 1 to 3, using the aluminum adhesive tape for fixing the heat radiating pipe of Comparative Example 1. The aluminum adhesive tape for fixing the heat radiating pipe of Comparative Example 1 was more likely to wrinkle than the samples of Examples 1 to 3, and the adhesion to the aluminum pipe was slightly lower than that of Examples 1 to 3. .

  Moreover, when the heat conductivity evaluation test by the method mentioned above was implemented 3 times with respect to the aluminum adhesive tape for heat radiation pipe fixation of the comparative example 1, the average value of the surface temperature of the measured metal foil was 7.0 degreeC. Yes, the thermal conductivity was inferior to the samples of Examples 1 to 3.

  A comparison table of Examples 1 to 3 and Comparative Example 1 is shown below.

  Thereby, the metal foil 1 and the base film 2 are laminated via the adhesive layer 6, and the pressure-sensitive adhesive tape 10, 10A for fixing the refrigerator heat pipe in which the adhesive layer 3 is laminated on the base film 2 side is made of metal. The thickness of the foil 1 is 5 to 15 μm, the laminated thickness of the metal foil 1, the adhesive layer 6 and the base film 2 is 25 to 35 μm, and the metal foil 1, the adhesive layer 6, the base film 2 and the pressure-sensitive adhesive layer 3 is 55 μm or less.

  As described above, the pressure-sensitive adhesive tape for fixing a refrigerator heat pipe according to the present invention does not break when affixed to adherends such as heat pipes and supports, and has higher thermal conductivity than conventional ones. It is useful for general adhesive tapes for fixing refrigerator heat pipes.

DESCRIPTION OF SYMBOLS 1 Metal foil 2 Base film 3 Adhesive layer 5 Release agent layer 6 Adhesive layer 10,10A Adhesive tape for refrigerator heat pipe fixation

Claims (2)

A metal foil and a base film are laminated via an adhesive layer, and a pressure-sensitive adhesive tape for fixing a refrigerator heat pipe in which a pressure-sensitive adhesive layer is laminated on the base film side,
The metal foil has a thickness of 5 to 15 μm,
The laminated thickness of the metal foil, the adhesive layer and the base film is 25 to 35 μm,
The pressure-sensitive adhesive tape for fixing a refrigerator heat pipe, wherein the laminated thickness of the metal foil, the adhesive layer, the base film and the pressure-sensitive adhesive layer is 55 μm or less.   The pressure-sensitive adhesive tape for fixing a refrigerator heat pipe according to claim 1, wherein a release agent layer is laminated on the metal foil side and wound in a roll shape.