JP2019204897A - Cooling jacket - Google Patents

Abstract

To provide a cooling jacket excellent in light-weight, and identifying a leakage location or a jamming location immediately, even when leakage of cooling medium from a duct, or jamming of a duct due to fine solid matter occurs to cause a problem in cooling, and facilitating recovery operation.SOLUTION: A cooling jacket 10 including a metal base plate 3 has a resin housing 1 on one face B (3b) of the metal base plate 3, the other face A (3a) of the metal base plate 3 is a surface for mounting an electrical heating element, at least a part of the resin housing 1 is formed of a resin composition containing crystalline polyolefin, and since the resin housing 1 is transparent, inside is visible.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cooling jacket.

In recent years, the power consumption of semiconductor devices has increased at an accelerated pace, and the amount of heat generated by semiconductor devices has increased accordingly. For this reason, in order to cool a semiconductor device efficiently, the demand for a high-performance cooling system is increasing.
Furthermore, the density of semiconductor devices is also increasing, the power consumption in high-density integrated circuits is also increasing at an accelerated rate, and the heat generation density is rapidly increasing along with the amount of heat generated.
In such electronic components such as semiconductor devices and high-density integrated circuits, for example, cooling systems for semiconductor devices such as those used conventionally such as forced heat absorption by Peltier elements and forced air cooling by air-cooling heat sinks and cooling fans However, there was a limit to the cooling capacity, and there was a problem of noise when using a fan.

  In recent years, the use of a liquid cooling type cooling jacket is becoming widespread. This liquid-cooling type cooling device is a metal plate-like liquid-cooled heat sink (hereinafter referred to as “cold plate”) that incorporates a liquid passage for circulating a cooling medium such as water (hereinafter sometimes referred to as “refrigerant”). The heat generated from the electronic component is provided outside the device (or near the housing of the device or near the housing) by the refrigerant that has passed through the liquid passage. The electronic component is cooled by being transported to the heat radiation side heat sink (see, for example, Patent Documents 1 to 3).

JP 2003-050645 A JP 2002-261480 A International Publication No. 2014/061725

Such a cold plate has improved cooling capacity compared to a cooling fan, is easy to miniaturize, and does not become an obstacle to increasing the mounting density of electronic components in electronic devices, and causes noise problems. It has many advantages such as not allowing it to occur.
However, the conventional cold plate includes an electronic device and a refrigerant circulation pump because the flow path is not visible when an accident occurs that prevents the refrigerant from being circulated evenly due to an unexpected clogging of the flow path. After stopping all power to the equipment, it was necessary to take out the troublesome work of removing only the cold plate and removing the clogging. Furthermore, when a refrigerant leaks from the flow path, there is a problem that it is difficult to instantly identify the leaked portion with the conventional cold plate. In addition, the conventional cold plate is basically made of only metal, so it is heavy. For example, when it is deployed on an in-vehicle cooling jacket, it may not be able to fully meet the needs of lighter vehicles. there were.

  The present invention has been made in view of the above circumstances, and even if leakage of refrigerant from the flow path or clogging of the flow path due to fine solids occurs and a malfunction occurs in cooling, the leakage location or clogging is caused. It is intended to provide a cooling jacket with excellent lightness that can be easily identified and restored.

According to the present invention, a cooling jacket is provided below.
[1]
A cooling jacket with a metal base plate,
Having a resin housing on one side B of the metal base plate;
The other surface A of the metal base plate is a surface for mounting a heating element,
At least a part of the resin housing is formed of a resin composition containing crystalline polyolefin,
A cooling jacket in which the resin housing is transparent and the inside is visible.
[2]
In the cooling jacket according to the above [1],
A cooling jacket in which the internal haze of the transparent portion of the resin housing is less than 10%.
[3]
In the cooling jacket according to the above [1] or [2],
A cooling jacket in which the crystalline polyolefin contains a 4-methyl-1-pentene polymer.
[4]
In the cooling jacket described in [3] above,
The cooling jacket in which the 4-methyl-1-pentene polymer contains 80 mol% or more of a structural unit derived from 4-methyl-1-pentene.
[5]
In the cooling jacket according to any one of the above [1] to [4],
A cooling jacket in which a plurality of side wall top surfaces erected on the bottom of the resin housing are joined to at least a peripheral portion of the surface B of the metal base plate via an intervening layer.
[6]
In the cooling jacket described in [5] above,
The cooling jacket in which the fine uneven | corrugated shape is formed in the adhesion area | region of the said intervening layer in the said surface B of the said metal base plate at least.
[7]
In the cooling jacket according to any one of [1] to [6] above,
A cooling jacket in which a baffle plate is formed inside the resin housing.
[8]
In the cooling jacket according to any one of [1] to [7],
A cooling jacket in which the metal base plate is composed of at least one member selected from the group consisting of an aluminum member, an aluminum alloy member, a copper member, and a copper alloy member.

  The cooling jacket of the present invention is lightweight because at least a part of the resin housing is formed of a resin composition containing a crystalline polyolefin excellent in transparency and lightness, and visibility of the refrigerant in the flow path Excellent. Therefore, according to the present invention, even if the refrigerant leaks from the flow path or the flow path is clogged with fine solids, and there is a problem in cooling, the location of leakage or clogged area can be immediately identified. Thus, it is possible to provide a cooling jacket that is easy to recover and excellent in lightness. Furthermore, the cooling jacket of the present invention is excellent in light weight because the housing for refrigerant is made of resin, and is excellent in heat insulation, so that the cold temperature is difficult to escape.

It is sectional drawing which showed typically an example of the structure of the cooling jacket of embodiment which concerns on this invention. It is the perspective view which showed typically an example of the structure of the cooling jacket of embodiment which concerns on this invention. It is a perspective view at the time of removing the upper part of the resin housing which comprises the cooling jacket shown in FIG. 2 (xy plane which passes an inflow port center). FIG. 3 is a cross-sectional perspective view (xz plane passing through the center of an inlet) schematically showing an example of the structure of a resin housing constituting the cooling jacket shown in FIG. 2. It is a schematic diagram for demonstrating the structure of the test piece used when measuring the tensile shear strength.

  Embodiments of the present invention will be described below with reference to the drawings. In all the drawings, similar constituent elements are denoted by common reference numerals, and description thereof is omitted as appropriate. Moreover, the figure is a schematic diagram and does not match the actual dimensional ratio. Unless otherwise specified, “˜” between numbers in the sentence represents the following.

FIG. 1 is a cross-sectional view schematically showing an example of the structure of a cooling jacket 10 according to an embodiment of the present invention. FIG. 2 is a perspective view schematically showing an example of the structure of the cooling jacket 10 according to the embodiment of the present invention. FIG. 3 is a perspective view in the case where the upper part of the resin housing 1 constituting the cooling jacket 10 shown in FIG. 2 is deleted (xy plane passing through the center of the inlet). 4 is a cross-sectional perspective view (xz plane passing through the center of the inlet) schematically showing an example of the structure of the resin housing 1 constituting the cooling jacket 10 shown in FIG.
The cooling jacket 10 according to the present embodiment is a cooling jacket provided with a metal base plate 3, has a resin housing 1 on one surface B (3 b) of the metal base plate 3, and the other of the metal base plate 3. The surface A (3a) is a surface for mounting a heating element, at least a part of the resin housing 1 is formed of a resin composition containing crystalline polyolefin, the resin housing 1 is transparent, and The inside is visible.
In the present embodiment, the resin housing 1 is for discharging the heated refrigerant after being brought into contact with, for example, the inlet 4 for injecting the refrigerant and the surface of the metal base plate 3 heated by the heating element. A discharge port 4 ′ may be provided. In the preferred cooling jacket 10 according to the present embodiment, the top surface of the plurality of side walls provided upright at the bottom of the resin housing 1 has a heating element non-mounting surface 3b (surface B) of the metal base plate 3 via the intervening layer 2. The cooling jacket 10 is formed by bonding to at least the peripheral edge of the above.

<Metal base plate>
The metal base plate 3 constituting the cooling jacket 10 according to the present embodiment diffuses heat from a heating element typified by a semiconductor device or a high-density integrated circuit, and is efficient for a refrigerant circulating in the resin housing 1. It plays two roles of transferring heat to Therefore, the metal constituting the metal base plate 3 is excellent in heat transfer, and at the same time, it is good when the same metal as the metal base plate 3 is used as a baffle plate formed in the resin housing 1 as described later. May also be required. From such a viewpoint, the metal base plate is preferably composed of at least one member selected from the group consisting of an aluminum member, an aluminum alloy member, a copper member, and a copper alloy member. Further, the thickness of the portion of the metal base plate 3 where the baffle plate is not formed is set to, for example, about 0.5 mm to 30 mm, preferably 0.5 mm to 20 mm in consideration of heat transfer, strength and light weight. Is done.
It is preferable that a fine concavo-convex shape is formed in at least a portion where the intervening layer 2 is attached (attachment region of the interposing layer 2) on the non-heating element mounting surface 3b (surface B) side of the metal base plate 3. . By doing so, the bonding strength between the resin housing 1 and the metal base plate 3 can be increased. As a result, the leakage of the refrigerant can be suppressed, and the cooling jacket 10 having excellent reliability, mechanical strength, and durability. Can be obtained.
There are no particular restrictions on the size of the fine irregularities (depth, hole diameter, distance between hole diameters, etc.), but the ten-point average roughness Rz measured according to JIS B 0601 is, for example, 1 μm or more, preferably 1 μm or more. It is a fine concavo-convex shape of 1 mm or less, more preferably 3 μm or more and 100 μm or less.

  Although there is no particular limitation as a method for forming the fine irregularities having the above-mentioned ten-point average roughness Rz on the metal surface of the metal base plate 3, for example, an inorganic base aqueous solution such as sodium hydroxide and / or hydrochloric acid, nitric acid, etc. A method of immersing a metal member in an inorganic acid aqueous solution; a method of treating a metal member by an anodic oxidation method; and pressing a metal mold punch having unevenness produced by mechanical cutting such as diamond abrasive grinding or blasting on the surface of the metal member A method for forming irregularities on the surface of the metal member, a method for producing irregularities on the surface of the metal member by sandblasting, knurling, laser processing; hydration as disclosed in International Publication No. 2009/31632 To one or more aqueous solutions selected from hydrazine, ammonia, and water-soluble amine compounds Can and a method of immersing the genus member mentioned.

  Among the methods described above, particularly when the dipping method is employed, the fine uneven shape on the metal base plate 3 is fine not only on the metal surface portion to which the intervening layer 2 is adhered, but also on the entire surface of the metal base plate 3. An uneven shape will be formed, but such an embodiment does not impair the effects of the present invention.

<Resin housing>
The resin housing 1 constituting the cooling jacket 10 according to the present embodiment is composed of, for example, one bottom portion and a plurality of side wall portions.
At least a part of the resin housing 1 is formed of a resin composition containing crystalline polyolefin, is further transparent, and the inside is visible.
Although it will not specifically limit if the inside of the resin housing 1 is visually recognizable, all the one bottom part and several side wall part which comprise the resin housing 1 are formed with the resin composition containing crystalline polyolefin. It is preferable.
The bottom part and the side wall part are preferably formed from the same crystalline polyolefin-containing resin composition. The number of side wall portions is not particularly limited, but is, for example, 4 to 8. As will be described later, the resin housing 1 is separately manufactured by a known molding means such as injection molding, for example. However, the number of side walls is considered in consideration of the general situation of the apparatus such as a mold structure at the time of molding, workability, and the like. Is appropriately determined. The side wall portion of the cooling jacket 10 shown as an example in the drawing is an irregular case having eight outer peripheral surfaces and four inner peripheral surfaces. The thickness of a bottom part and a side wall part is 1 mm-10 mm, for example, Preferably it is 2 mm-8 mm. By being in such a range, it can be set as the rigid housing structure which can fully endure the injection pressure of a refrigerant | coolant. The housing strength may be reinforced by a rib structure outside the resin housing 1. The material used for the reinforcing rib is, for example, a resin, and is preferably a crystalline polyolefin-containing resin composition that is the same as the constituent resin of the resin housing 1. Such resin-made reinforcing ribs can be easily applied in the molding stage of the resin-made housing.

  The internal haze of the transparent portion of the resin housing 1 is, for example, less than 10%, preferably less than 8%, more preferably less than 5%, and particularly preferably less than 3% when the molded plate has a thickness of 2 mm. is there. In other words, the resin housing 1 is excellent in transparency. As a result, the visibility in the resin housing 1 is improved. For example, leakage of refrigerant from a baffle plate (flow path) provided in the resin housing 1 or clogging of the flow path due to fine solids occurs. Even if a failure occurs, it is possible to easily identify a leaked part or a clogged part and to perform a recovery operation.

The resin housing 1 according to the present embodiment is formed from a crystalline polyolefin-containing resin composition.
As the crystalline polyolefin, 4-methyl-1-pentene polymer is more preferable from the viewpoint of balance of lightness, moldability, heat resistance, mechanical strength, adhesiveness, and the like, and poly-4-methyl-1- Pentene is particularly preferred.

  The crystalline polyolefin is, for example, a polymer obtained by (co) polymerizing at least an α-olefin represented by the following formula [i] as one component, and is a polyolefin having crystallinity.

CH ₂ = CHR [i]
(However, in said formula [i], R is either a hydrogen atom or a C1-C20 alkyl group.)

  Specific examples of such crystalline polyolefin include polyethylene, ethylene / 1-butene copolymer, ethylene-3-methyl-1-butene copolymer, ethylene-4-methyl-1-pentene copolymer, ethylene 1-hexene copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer and its metal salt, polypropylene, propylene / ethylene copolymer, propylene / 1-butene copolymer, propylene / 4- Methyl-1-pentene copolymer, poly 1-butene, 1-butene / ethylene copolymer, 1-butene / propylene copolymer, 1-butene / 4-methyl-1-pentene copolymer, poly-4 -Methyl-1-pentene and poly-3-methyl-1-butene can be mentioned. In the present embodiment, the crystalline polyolefin includes a blend of the above resins. The crystalline polyolefin resin has crystallinity, and the crystallinity obtained from the relationship between crystallinity and density by X-ray diffraction method is, for example, 15% or more, preferably 20% or more, more preferably 25%. More preferably, it is 30% or more.

  As the crystalline polyolefin having a haze of less than 10% and a crystallinity of 15% or more in the case of the resin housing 1, 4-methyl-1 is excellent in heat resistance and chemical resistance among the above resins. A pentene polymer is particularly preferably used. This 4-methyl-1-pentene polymer preferably contains 80 mol% or more, more preferably 90 mol% or more of a structural unit derived from 4-methyl-1-pentene.

The 4-methyl-1-pentene polymer according to the present embodiment polymerizes a monomer containing 4-methyl-1-pentene in the presence of a known olefin polymerization catalyst such as a Ziegler-Natta catalyst or a metallocene catalyst. It is manufactured by. For example, a homopolymer of 4-methyl-1-pentene, or a copolymer of 4-methyl-1-pentene and other monomers can be used, and any copolymer can be used as long as the effects of the present invention are exhibited. .
Examples of the other monomer copolymerized with 4-methyl-1-pentene include α-olefins having 3 to 20 carbon atoms excluding ethylene and 4-methyl-1-pentene. Specific examples of such α-olefins include propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 3-methyl-1-pentene, and 3-ethyl-1- Pentene, 4,4-dimethyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene, 4-ethyl-1-hexene, 3-ethyl-1-hexene, 1-octene, Examples include 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene and 1-eicocene. Of these, α-olefins having 6 to 20 carbon atoms excluding 4-methyl-1-pentene are preferable, and α-olefins having 8 to 20 carbon atoms are more preferable. These α-olefins can be used singly or in combination of two or more.

The 4-methyl-1-pentene polymer according to the present embodiment preferably satisfies the following requirements (Pi) and (P-ii).
(P-i) The melt flow rate (MFR; ASTM D1238, 260 ° C., 5 kgf) is, for example, 1 to 500 g / 10 min, preferably 2 to 100 g / 10 min, more preferably 3 to 30 g / 10 min. When the MFR is in the above range, it is preferable in terms of fluidity during molding.
(P-ii) Melting | fusing point (Tm) is 210-250 degreeC, for example, Preferably it is 215-245 degreeC, More preferably, it is 220-240 degreeC, More preferably, it is 224-240 degreeC. When the melting point is not less than the above lower limit, the strength of the molded product obtained using the resin composition containing the 4-methyl-1-pentene polymer may be further improved, and the melting point may be the above upper limit. If it is less than the value, the impact strength and toughness of the molded product obtained using the resin composition containing a 4-methyl-1-pentene polymer may be further improved.

  The content of the crystalline polyolefin constituting the crystalline polyolefin-containing resin composition is, for example, 70% by mass or more, preferably 80% by mass or more, and preferably 90% by mass or more. Examples of optional components constituting the crystalline polyolefin-containing resin composition include crystal nucleating agents composed of amide compounds, fillers such as hydrotalcite, antioxidants, heat stabilizers, pigments, weathering agents, and plasticizers. And dispersants, lubricants, mold release agents, antistatic agents, impact resistance improvers, flame retardants, and colorants. The addition amount of these arbitrary components is 0.01-30 mass% in a resin composition, for example, Preferably it is 0.1-20 mass%, More preferably, it is 0.5-10 mass%.

  A baffle plate 5 may be formed inside the resin housing 1 according to the present embodiment. The baffle plate 5 has two functions as a flow path that allows efficient cooling of the base plate by substantially uniform diffusion of the refrigerant that has entered from the injection port 4 and smooth discharge to the discharge port 4 ′. . In the present embodiment, the baffle plate 5 may be made of resin or metal. Resin baffles are used in applications where the weight of the entire cooling jacket is important, while metal baffles are used in applications where the cooling efficiency of the amount of heat conducted to the metal base plate is important. In addition, the baffle plate described in the attached drawing is a metal baffle plate. Normally, the resin type constituting the resin baffle plate is the same as the resin type constituting the resin housing, and the metal type constituting the metal baffle plate is the same as the metal type constituting the metal base plate and mutually It is integrally formed. The metal baffle plate having such a structure is also called an inner fin, and can be formed by cutting a metal using a known processing method such as a multi-cutter. On the other hand, a resin baffle plate is most commonly formed by simultaneously forming baffle plates that also serve as flow paths when forming a resin housing, and the other method is a container shape consisting of only a bottom plate and side walls. It is possible to fabricate the resin housing by attaching a resin manifold portion in which a baffle plate or a flow path is separately formed, and bonding the resin manifold body portion to the resin housing main body portion.

  The resin housing 1 according to this embodiment is formed such that the top surface portion of the side wall portion is joined to at least the peripheral edge portion of the heating element non-mounting surface 3b (surface B) of the metal base plate 3 via the intervening layer 2. It is preferable that In addition, it is desirable that the resin housing 1 is such that the top surface of the side wall portion is flush with the peripheral portion of the metal base plate 3. Such a resin housing 1 is preferably produced separately by a normal molding means, and then joined and integrated with the intervening layer 2 formed on the peripheral edge of the metal base plate 3 as described later.

As the molding method of the resin housing 1 and, if necessary, the resin manifold portion, any known method can be used without limitation. For example, injection molding, extrusion molding, heat press molding, compression molding, transfer molding, casting molding, Examples thereof include laser welding molding, reaction injection molding (RIM molding), rim molding (LIM molding), and thermal spray molding. Among these, as a manufacturing method of the resin housing 1, an injection molding method is preferable from the viewpoint of productivity and quality stability. Examples of typical conditions for injection molding include the following conditions. Cylinder temperature: 250 ° C. to 320 ° C., mold temperature: 50 ° C. to 70 ° C., injection pressure (primary pressure); 300 kg / cm ^{2 to} 320 kg / cm ² , injection time (primary); 3 seconds to 7 seconds.

<Intervening layer>
In the cooling jacket 10 according to the present embodiment, the top surface of the plurality of side walls provided upright at the bottom of the resin housing 1 has a heating element non-mounting surface 3b (surface B) of the metal base plate 3 via the intervening layer 2. It is preferable that it is joined to at least the peripheral edge. That is, the intervening layer 2 is positioned in an intermediate layer that firmly connects the non-heating element mounting surface 3b of the metal base plate 3 and the resin housing 1 and is made of, for example, a resin composition. The height (thickness) of the intervening layer 2 is, for example, about 10 μm to 5 mm, preferably about 50 μm to 3 mm. The bonding strength is ensured by being 10 μm or more, and unnecessary resin consumption can be suppressed by being 5 mm or less. The resin species constituting the intervening layer 2 penetrates into the concave portion of the fine concavo-convex structure formed on the surface of the metal base plate 3 to express sufficient bonding strength with the metal, and is also strong with the resin constituting the resin housing 1 It is preferable that the connection between the metal base plate 3 and the resin housing 1 is maintained over a long period of time. A preferable resin type varies depending on a connection method at the time of manufacturing the cooling jacket 10 described later, but a known thermoplastic resin and thermosetting resin are preferably used. As the thermoplastic resin, a thermoplastic resin containing a modified polyolefin obtained by graft modification with an ethylenically unsaturated bond-containing monomer such as an acid anhydride is preferably used.

<Method for manufacturing cooling jacket>
In the cooling jacket 10, for example, the top surfaces of a plurality of side walls erected on the bottom of the resin housing 1 are joined to at least the peripheral edge of the heating element non-mounting surface 3 b of the metal base plate 3 via the intervening layer 2. Thus, it can manufacture by connecting. For example, when a thermoplastic resin is used as the intervening layer 2, after the intervening layer 2 is formed by injection molding of a thermoplastic resin on the metal surface on which the fine concavo-convex shape is formed. Then, the side wall top surface portion of the resin housing is integrated on the intervening layer 2 by a known plastic bonding method. Examples of such a bonding method include bonding with an adhesive, thermal welding, wave welding, vibration welding, ultrasonic welding, high frequency welding, laser welding, and the like.
On the other hand, when a thermosetting resin (cured body) is used as the intervening layer 2, a varnish containing a corresponding thermosetting resin and a curing agent is applied to the surface of the fine uneven shape, and then the side wall of the resin housing 1. It becomes possible to integrate by mounting the top surface of the part and then curing by means of heat or light.

  In this way, according to the present invention, leakage of the refrigerant from the flow path or clogging of the flow path due to fine solids occurs, and even if there is a malfunction in cooling, the leakage location or clogged location is immediately A cooling jacket is provided that is easy to identify and restore.

  Hereinafter, the present embodiment will be described in detail with reference to examples and comparative examples. In addition, this embodiment is not restrict | limited at all to description of these Examples.

<Preparation of Poly-4-methyl-1-pentene Molded Piece>
Poly-4-methyl-1-pentene (trade name: TPX, brand name: RT18, MFR (260 ° C., 5 kg load) 26 g / 10 min) manufactured by Mitsui Chemicals, Inc., cylinder temperature; 300 ° C., injection pressure (primary / Secondary); 550/470 kg / cm ² , injection time (primary / secondary); 4 seconds / 2 seconds, mold temperature; injection molding under the conditions of 60 ° C., a rectangular parallelepiped shape of 45 mm × 10 mm × 3 mm A plurality of poly-4-methyl-1-pentene compacts were produced. The obtained molded body piece had an internal haze of 2.5% and a crystallinity of 30% obtained from an X-ray diffraction method.
The internal haze was measured with a digital turbidimeter (NDH-20D) manufactured by Nippon Denshoku Industries Co., Ltd.
The degree of crystallinity by the X-ray diffraction method was determined by measuring the X-ray profile by the transmission method under the conditions of 50 kV-300 mA and point focus using a “RINT2500” X-ray diffractometer manufactured by Rigaku Corporation with a rotating sample stage. From the obtained X-ray profile, the crystal part and the amorphous part were separated, and the crystallinity was determined.

<Measurement of tensile shear strength>
As shown in FIG. 5, a tensile tester “model 1323 (for a test piece in which the copper plate 7 after the roughening treatment and the poly-4-methyl-1-pentene test piece 6 are vertically overlapped on one end side through an intervening layer” X) shown in FIG. 5 under the conditions of a distance between chucks of 60 mm and a tensile speed of 10 mm / min at room temperature (23 ° C.). Measurement was performed by pulling in the direction. The joint strength (MPa) was obtained by dividing the breaking load (N) by the area of the metal / resin joint. Note that the length of the overlapping portion a was about 10 mm.

<Preparation of adhesive varnish comprising modified poly-4-methyl-1-pentene>
Poly-4-methyl-1-pentene (Mitsui Chemicals Co., Ltd. MX002UP; MFR (260 ° C., 5 kg load) 3 g / 10 min, melting point (Tm) 224 ° C.) 100 parts by weight, maleic anhydride 1 part by weight, As an organic peroxide, 0.02 part by weight of 2,5-dimethyl-2,5-bis (t-butylperoxy) hexyne-3 and a twin-screw extruder (Ikegai Co., Ltd., PCM45, φ = 45 mm, At L / D = 30), melt kneading was performed for 3 minutes at a cylinder temperature of 270 ° C. to obtain maleic acid-modified poly-4-methyl-1-pentene.
The resulting maleic acid-modified poly-4-methyl-1-pentene had a melting point (Tm) of 222 ° C., and the amount of maleic acid grafted onto poly-4-methyl-1-pentene was 0.8% by weight, 135 ° C., decalin. The intrinsic viscosity [η] was 1.5 dl / g. The modified product was dissolved in ethyl acetate to prepare an adhesive varnish having a solid content of 20% by mass.

[Example 1]
A commercially available 1 mm thick C1100 tough pitch copper plate material was obtained and cut into a rectangular parallelepiped copper plate piece of 45 mm × 18 mm. A commercially available degreasing agent for aluminum alloy “NE-6 (manufactured by Meltex Co.)” was filled in an immersion tank as a degreasing aqueous solution at 60 ° C. as an aqueous solution containing 7.5%. Here, the copper alloy plate pieces were immersed for 5 minutes to degrease and washed thoroughly with water.
Subsequently, an etching solution (composition: 137 g / L of sulfuric acid, 25 g / L of hydrogen peroxide, 0.3 g / L of 5-phenyltetrazole, 4-nitro) disclosed in the examples of JP-A-2013-22761 is provided in another tank. Etching was carried out at 30 ° C. under rocking in a benzotriazole 0.7 g / L, toluenesulfonic acid 3 g / L, chloride ions 8 ppm, and the balance ion exchange water. The etching amount at this time was 5.0 μm. Next, washing with water and drying were performed to secure a plurality of roughened copper plates.
Next, an adhesive varnish made of modified poly-4-methyl-1-pentene prepared by the above-described method was applied to the ends of the five roughened copper plates. At the same time, the same adhesive varnish was applied to the ends of five poly-4-methyl-1-pentene molded pieces produced by the above method. About a total of 10 sheets, the solvent in the varnish was removed by putting it in a desiccator with the coated surface facing upward and reducing the pressure with a vacuum pump to normal pressure. The roughened copper plate with the adhesive attached to the end face and the molded product pieces with the adhesive attached to the end face are overlapped with each other and pressed with a compression molding machine at 20 ° C. under a pressure of 20 kg / cm ^{2 for} 4 minutes. 5 sets of composites as shown in FIG. Ten composite shear strengths were measured in accordance with the tensile shear strength measurement method described above. As a result, the average value of tensile shear strength was 17 MPa.

DESCRIPTION OF SYMBOLS 1 Resin housing 2 Intervening layer 3 Metal base plate 3a Heating element mounting surface (surface A)
3b Heating element non-mounting surface (surface B)
4 Inflow port 5 Baffle plate 6 Poly-4-methyl-1-pentene test piece 7 Copper plate after roughening treatment 10 Cooling jacket

Claims (8)

A cooling jacket with a metal base plate,
Having a resin housing on one side B of the metal base plate;
The other surface A of the metal base plate is a surface for mounting a heating element,
At least a part of the resin housing is formed of a resin composition containing crystalline polyolefin;
A cooling jacket in which the resin housing is transparent and the inside is visible. The cooling jacket according to claim 1,
The cooling jacket whose internal haze of the transparent part of the resin housing is less than 10%. The cooling jacket according to claim 1 or 2,
A cooling jacket in which the crystalline polyolefin contains a 4-methyl-1-pentene polymer. The cooling jacket according to claim 3.
The cooling jacket in which the 4-methyl-1-pentene polymer contains 80 mol% or more of a structural unit derived from 4-methyl-1-pentene. The cooling jacket according to any one of claims 1 to 4,
A cooling jacket in which a plurality of side wall top surfaces standing on the bottom of the resin housing are joined to at least a peripheral portion of the surface B of the metal base plate via an intervening layer. The cooling jacket according to claim 5,
The cooling jacket in which the fine uneven | corrugated shape is formed in the adhesion area | region of the said intervening layer in the said surface B of the said metal base plate at least. The cooling jacket according to any one of claims 1 to 6,
A cooling jacket in which a baffle plate is formed inside the resin housing. The cooling jacket according to any one of claims 1 to 7,
A cooling jacket in which the metal base plate is composed of at least one member selected from the group consisting of an aluminum member, an aluminum alloy member, a copper member, and a copper alloy member.

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