WO2014119666A1 - 樹脂成形体の製造方法、及びグラファイトシート積層体 - Google Patents
樹脂成形体の製造方法、及びグラファイトシート積層体 Download PDFInfo
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- WO2014119666A1 WO2014119666A1 PCT/JP2014/052124 JP2014052124W WO2014119666A1 WO 2014119666 A1 WO2014119666 A1 WO 2014119666A1 JP 2014052124 W JP2014052124 W JP 2014052124W WO 2014119666 A1 WO2014119666 A1 WO 2014119666A1
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- graphite sheet
- fixed layer
- resin
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- sheet laminate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/005—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile
- B32B9/007—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile comprising carbon, e.g. graphite, composite carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/022—Mechanical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
- B29C45/14811—Multilayered articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B9/045—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
- B29C2045/0012—Skin layers without fibres or with little fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2707/00—Use of elements other than metals for preformed parts, e.g. for inserts
- B29K2707/04—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2009/00—Layered products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/51—Elastic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/38—Layered products comprising a layer of synthetic resin comprising epoxy resins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/42—Layered products comprising a layer of synthetic resin comprising condensation resins of aldehydes, e.g. with phenols, ureas or melamines
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
- C08J5/042—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with carbon fibres
Definitions
- the present invention relates to a graphite sheet laminate and a method for producing a resin molded body in which a graphite sheet and a resin using the same are integrally molded.
- a graphite composite is formed by combining the graphite sheet and an adhesive layer such as a double-sided tape, and then the resin composite that forms the casing via the adhesive layer.
- an adhesive layer such as a double-sided tape
- the resin composite that forms the casing via the adhesive layer By attaching a graphite sheet into the housing at the same time when molding the housing of an electronic device or by compositing the graphite sheet as a part of the housing, the thinness of the housing is maintained.
- a method of obtaining a casing having high thermal conductivity has been considered.
- Patent Document a method of molding a composite of a graphite film and a resin by an insert molding method in which a graphite sheet is placed in a molding die and then a resin material is injection molded in the die.
- Patent Document 1 a method of molding a composite of a graphite film and a resin by an insert molding method in which a graphite sheet is placed in a molding die and then a resin material is injection molded in the die.
- Japanese Patent Publication Japanese Patent Laid-Open No. 11-179830 (published July 6, 1999)”
- An object of the present invention is to produce an integrally molded product of a graphite sheet and a resin by insert molding without causing a positional shift of the graphite sheet.
- the method for producing a resin molded body of the present invention has an elastic modulus of 7.0 ⁇ 10 4 Pa or more at the introduction resin temperature at the time of injection molding on at least one main surface of the graphite sheet.
- a graphite sheet laminate including a structure in which a first fixed layer that is 0 ⁇ 10 7 Pa or less is in contact with a cavity surface of one injection mold on the main surface opposite to the first fixed layer side of the graphite sheet laminate After the molds are brought into contact with each other, the injection mold is clamped and the molten resin is injected into the cavity to bond the graphite sheet laminate and the resin.
- the method for producing a resin molded body of the present invention has an elastic modulus at 250 ° C. of 7.0 ⁇ 10 4 Pa or more and 5.0 ⁇ 10 7 on at least one main surface of the graphite sheet.
- a graphite sheet laminate including a configuration in which a first fixed layer that is Pa or less is in contact with a cavity surface of one injection mold so that a main surface opposite to the first fixed layer side of the graphite sheet laminate contacts Then, the injection mold is clamped and a molten resin is injected into the cavity to bond the graphite sheet laminate and the resin.
- the modulus of elasticity of the graphite sheet on the main surface opposite to the first fixed layer side is 7.0 ⁇ 10 4 Pa or more at the introduced resin temperature at the time of injection molding. It is preferable that the 2nd fixed layer used as x10 ⁇ 8 > Pa or less is formed.
- the temperature of the introduced resin at the time of injection molding is 230 ° C. or higher and 350 ° C. or lower.
- a support is formed on the main surface of the second fixed layer opposite to the graphite sheet.
- the thickness of the support is preferably 1 ⁇ m to 50 ⁇ m.
- the thickness of the graphite sheet is preferably 5% to 75% of the thickness of the graphite sheet laminate.
- the graphite sheet laminate of the present invention has an elastic modulus at 250 ° C. of 7.0 ⁇ 10 4 Pa or more and 5.0 ⁇ 10 7 Pa or less on at least one main surface of the graphite sheet.
- the 1st fixed layer which is is characterized by including the structure which is in contact with the graphite sheet.
- the first fixed layer preferably has an elastic modulus at 80 ° C. of 1.0 ⁇ 10 4 Pa to 5.0 ⁇ 10 6 Pa.
- the first fixed layer preferably has a higher elastic modulus at 250 ° C. than that at 80 ° C.
- the graphite sheet laminate of the present invention has an elastic modulus at 80 ° C. of 1.0 ⁇ 10 4 Pa or more and 5.0 ⁇ 10 7 Pa or less, 250 on the main surface opposite to the first fixed layer side of the graphite sheet. It is preferable that the second fixed layer having an elastic modulus at ° C. of 7.0 ⁇ 10 4 Pa to 5.0 ⁇ 10 8 Pa is in contact with the graphite sheet.
- the second fixed layer preferably has a higher elastic modulus at 250 ° C. than that at 80 ° C.
- the second fixed layer is formed on the main surface opposite to the first fixed layer side of the graphite sheet, and the support is on the side opposite to the graphite sheet of the second fixed layer. It is preferable to be formed on the main surface.
- the thickness of the support is preferably 1 ⁇ m to 50 ⁇ m.
- the thickness of the graphite sheet is preferably 5% to 75% of the thickness of the graphite sheet laminate.
- the present invention in the injection molding performed so that the first fixed layer of the graphite sheet laminate is in contact with the cavity surface of the injection mold, it is possible to suppress the positional deviation of the graphite sheet.
- FIG. 1A and 1B are schematic views illustrating a resin molded body according to an embodiment, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line 1B-1B in FIG.
- the first fixed layer 55 having an elastic modulus of 7.0 ⁇ 10 4 Pa or more and 5.0 ⁇ 10 7 Pa or less at an introduced resin temperature at the time of injection molding is provided on at least one main surface of the graphite sheet 10.
- the introduced resin temperature at the time of injection molding refers to the resin temperature at the tip of the gate 40 of the injection molding machine with reference to FIG.
- the resin temperature is measured by inserting a thermocouple 42 from the mold toward the gate 40 and placing the thermocouple 42 in contact with the resin.
- the thermocouple 42 is arranged out of the mold to the gate 40 side so as not to prevent introduction of the resin.
- the “main surface” means a surface occupying a large area among the surfaces forming the surface of the structure (for example, a graphite sheet or a graphite laminate).
- the “main surface” may be a surface that occupies the largest area among the surfaces that form the surface of the configuration, or a surface that occupies the second largest area.
- one main surface can be a surface having the largest area, and the other main surface can be a surface having the same (or substantially the same) area as one main surface. .
- one main surface can be the surface having the largest area, and the other main surface can be the surface occupying the second largest area.
- One main surface may be a surface occupying the second largest area, and the other main surface may be a surface having the largest area.
- the “main surface” may be a surface that occupies 30 (%) or more, and a surface that occupies 40 (%) or more when the total area of the surface forming the surface of the configuration is 100 (%).
- the surface may occupy 50% or more, may occupy 60% or more, may occupy 70% or more, or 80 (%). ) May occupy more than 90% or more.
- the first fixing layer 55 is set in the mold 21 as shown in FIG. 1 so as to come into contact with the injection resin, and plays a role for disposing the graphite sheet laminate 81 without being displaced from the molded body.
- the first fixed layer 55 has an elastic modulus at the introduced resin temperature of 7.0 ⁇ 10 4 Pa to 5.0 ⁇ 10 7 Pa, preferably 8.5 ⁇ 10 4 Pa to 3.0 ⁇ 10 7 Pa. More preferably, a material of 1.0 ⁇ 10 5 Pa to 1.0 ⁇ 10 7 Pa is selected.
- the resin introduction temperature is preferably 230 ° C. or higher and 350 ° C. or lower (for example, 250 ° C. or 310 ° C.).
- the introduction temperature of the introduced resin may be 300 ° C. or more.
- the graphite sheet laminate 81 is resin-molded even when the first fixed layer 55 is not flown, the surface activity is low, and the graphite sheet 10 having low adhesion to other materials is used. It can be installed at any desired position on the body. Further, by setting the elastic modulus of the first fixed layer 55 to an appropriate softness, the first fixed layer 55 has a tack property and adheres to the introduced resin (that is, the resin forming the molded body). It is possible to suppress misalignment and adhesion failure.
- the elastic modulus of the first fixed layer 55 at the introduced resin temperature may be 1.0 ⁇ 10 5 or more and 3.2 ⁇ 10 7 or less, and 1.0 ⁇ 10 5 or more and 1.0 ⁇ . may also be 107 or less, it may be 3.2 ⁇ 10 7 or less 2.1 ⁇ 10 6 or more. Even when the elastic modulus of the first fixing layer 55 at the introduced resin temperature is the value, even if the injection temperature of the introduced resin may be 300 ° C. or higher, the first fixing layer 55 is allowed to flow. Even when the graphite sheet 10 having low surface activity and low adhesion to other materials is used, the graphite sheet laminate 81 can be installed at a desired position of the resin molded body.
- the first fixed layer 55 has a tack property and adheres to the introduced resin (that is, the resin forming the molded body). It is possible to suppress misalignment and adhesion failure.
- the elastic modulus of the first fixed layer 55 at the mold temperature is preferably 1.0 ⁇ 10 4 Pa to 5.0 ⁇ 10 6 Pa, more preferably 5.0 ⁇ 10 4 Pa to 3.0 ⁇ . 10 6 Pa or less, more preferably 8.0 ⁇ 10 4 Pa or more and 1.0 ⁇ 10 6 Pa or less.
- the mold temperature is preferably 70 ° C. or higher and 150 ° C. or lower (for example, 25 ° C. or 80 ° C.).
- the elastic modulus of the first fixed layer 55 at the mold temperature may be 3.0 ⁇ 10 5 or more and 5.0 ⁇ 10 7 or less, and 8.5 ⁇ 10 6 or more and 5.0 ⁇ . It may be 10 7 or less, and may be 3.0 ⁇ 10 5 or more and 4.0 ⁇ 10 6 or less.
- the elastic modulus of the first fixed layer 55 at the mold temperature is equal to the value, the graphite sheet laminate 81 is not flowed even when a high temperature resin is introduced, and the displacement of the graphite sheet laminate 81 is prevented. Can do.
- the first fixed layer 55 since the first fixed layer 55 has a suitable softness, the first fixed layer 55 and the resin have a wide contact area because the introduced resin bites into the first fixed layer 55 with the momentum of injection. Can do.
- the elastic modulus at the mold temperature is preferably 1.0 ⁇ 10 4 Pa to 5.0 ⁇ 10 6 Pa, and the elastic modulus at the introduced resin temperature is 7 0.0 ⁇ 10 4 Pa to 5.0 ⁇ 10 7 Pa, more preferably the elastic modulus at the mold temperature is 5.0 ⁇ 10 4 Pa to 3.0 ⁇ 10 6 Pa, and the introduced resin
- the elastic modulus at temperature is 8.5 ⁇ 10 4 Pa or more and 3.0 ⁇ 10 7 Pa or less, more preferably, the elastic modulus at mold temperature is 8.0 ⁇ 10 4 Pa or more and 1.0 ⁇ 10 6 Pa.
- the elastic modulus at the introduced resin temperature is 1.0 ⁇ 10 5 Pa or more and 1.0 ⁇ 10 7 Pa or less.
- the elastic modulus at the mold temperature is the elastic modulus at any temperature of 70 ° C. to 150 ° C.
- the elastic modulus at the introduced resin temperature is the elastic modulus at any temperature of 230 ° C. to 350 ° C. It is preferable to use the first fixed layer 55 that has the above elastic modulus when the elastic modulus at any temperature of 70 ° C. to 150 ° C. rises to any temperature of 230 ° C. to 350 ° C. .
- the elastic modulus of the first fixed layer 55 at the introduced resin temperature is 1.0 ⁇ 10 5 or more and 3.2 ⁇ 10 7 or less
- the elastic modulus of the first fixed layer 55 at the mold temperature is 3.0 ⁇ 10 5 or more and 5.0 ⁇ 10 7 or less, 8.5 ⁇ 10 6 or more and 5.0 ⁇ 10 7 or less, or 3.0 ⁇ 10 5 or more and 4.0 ⁇ 10 6 or less, Also good.
- the elastic modulus of the first fixed layer 55 at the introduced resin temperature is 1.0 ⁇ 10 5 or more and 1.0 ⁇ 10 7 or less
- the elastic modulus of the first fixed layer 55 at the mold temperature is 3.
- the elastic modulus of the first fixed layer 55 at the introduced resin temperature is 2.1 ⁇ 10 6 or more and 3.2 ⁇ 10 7 or less
- the elastic modulus of the first fixed layer 55 at the mold temperature is 3. It may be 0 ⁇ 10 5 or more and 5.0 ⁇ 10 7 or less, 8.5 ⁇ 10 6 or more and 5.0 ⁇ 10 7 or less, or 3.0 ⁇ 10 5 or more and 4.0 ⁇ 10 6 or less.
- the first fixed layer 55 preferably has a high elastic modulus at the introduced resin temperature at the time of injection molding. That is, when the resin introduced into the mold comes into contact with the first fixed layer 55, the first fixed layer 55 is cured, thereby exerting a strong adhesive effect, and strengthening the resin and the first fixed layer 55. It is possible to prevent the positional deviation of the graphite sheet laminate 81. Also, between the graphite sheet 10 and the first fixed layer 55, the first fixed layer 55 penetrates into the irregularities on the surface of the graphite sheet 10 at the mold temperature, and then hardens at the introduced resin temperature. Can demonstrate its sexuality. That is, it is preferable that the first fixed layer 55 is formed of a material having a certain degree of softness before introduction of the resin and having a modulus of elasticity that increases when the resin comes into contact.
- the resin for forming the first fixed layer 55 is not particularly limited, and for example, an acrylic resin, an epoxy resin, a phenol resin, or the like can be used as appropriate.
- the second fixed layer 51 may be formed on the main surface of the graphite sheet 10 opposite to the first fixed layer 55 side as shown in FIG.
- the second fixed layer 51 plays a role of preventing positional deviation between the support and the graphite sheet 10 when forming a support as described later.
- the second fixed layer 51 reinforces the weak mechanical strength of the graphite sheet 10 even when there is no support, and exhibits a function of suppressing the breakage and breakage of the graphite sheet 10.
- the elastic modulus at the introduced resin temperature is preferably 7.0 ⁇ 10 4 Pa or more and 5.0 ⁇ 10 8 Pa or less, more preferably 8.5 ⁇ 10 4 Pa or more and 3.0 ⁇ . 10 8 Pa or less, more preferably 1.0 ⁇ 10 5 Pa or more and 1.0 ⁇ 10 8 Pa or less is selected. If the elastic modulus at the introduced resin temperature of the second fixed layer 51 is 7.0 ⁇ 10 4 Pa or more and 5.0 ⁇ 10 8 Pa or less, the second fixed layer 51 is molded without being displaced from the graphite sheet 10. You can get a body.
- the elastic modulus of the second fixed layer 51 at the introduced resin temperature may be 9.6 ⁇ 10 5 or more and 2.1 ⁇ 10 6 or less. Even when the elastic modulus of the second fixed layer 51 at the introduced resin temperature is the value, the molded body can be obtained without the second fixed layer 51 being displaced from the graphite sheet 10.
- the elastic modulus of the second fixed layer 51 is preferably 1.0 ⁇ 10 4 Pa or more and 5.0 ⁇ 10 7 Pa or less at the mold temperature, and the elastic modulus at the introduced resin temperature is 7 or less.
- 0.0 ⁇ 10 4 Pa to 5.0 ⁇ 10 8 Pa more preferably, the elastic modulus at the mold temperature is 5.0 ⁇ 10 4 Pa to 3.0 ⁇ 10 7 Pa, at the introduced resin temperature.
- the elastic modulus is 8.5 ⁇ 10 4 Pa or more and 3.0 ⁇ 10 8 Pa, more preferably, the elastic modulus at the mold temperature is 8.0 ⁇ 10 4 Pa or more and 1.0 ⁇ 10 7 Pa or less, the introduced resin.
- the elastic modulus at temperature is 1.0 ⁇ 10 5 Pa or more and 1.0 ⁇ 10 8 Pa or less.
- the elastic modulus of the second fixed layer 51 at the mold temperature may be 5.0 ⁇ 10 5 or more and 1.0 ⁇ 10 7 or less. Further, as the elastic modulus of the second fixed layer 51, the elastic modulus at the mold temperature is preferably 5.0 ⁇ 10 5 or more and 1.0 ⁇ 10 7 or less, and the elastic modulus at the introduced resin temperature is 9 It may be 6 ⁇ 10 5 or more and 2.1 ⁇ 10 6 or less.
- the elastic modulus at the mold temperature means an elastic modulus at any temperature of 70 ° C. to 150 ° C. (for example, 25 ° C. or 80 ° C.).
- the elastic modulus at the introduced resin temperature is an elastic modulus at any temperature of 230 ° C. to 350 ° C. (for example, 250 ° C. or 310 ° C.).
- the second fixed layer 51 having the above elastic modulus may be used. preferable.
- the second fixed layer 51 has a high elastic modulus at the introduced resin temperature at the time of injection molding.
- the resin for forming the second fixed layer 51 is not particularly limited, and for example, an acrylic resin, an epoxy resin, a phenol resin, or the like can be used as appropriate.
- a support is fixed to the graphite sheet laminate.
- the support is a material for reinforcing the mechanical strength of the graphite sheet.
- the graphite sheet 10 is fixed to the support 31 as shown in FIG. High mechanical properties (rigidity and elasticity) can be obtained as compared with a single body.
- Examples of the support 31 include resin films such as PET film, acrylic film, ABS film, PEN film, and PE film, and metal foil such as aluminum foil, copper foil, and SUS foil.
- the method for forming the support 31 is not particularly limited, and examples thereof include a method of laminating film-like materials by lamination, a method of forming a liquid resin by coating, and the like.
- a fixing layer for example, a second fixing layer
- an adhesive may be provided between the support 31 and the graphite sheet 10.
- the fixed layer with the same material as the first fixed layer 55 formed on the main surface of the graphite sheet 10, the adhesive strength between the graphite sheet 10 and the support 31 can be kept good.
- the support 31 preferably has a tensile elastic modulus of 1 GPa or more, more preferably 2 GPa or more, More preferably, it is 3 GPa or more.
- the thickness of the support 31 can be appropriately set so as to satisfy the above mechanical strength characteristics, but is preferably 1 ⁇ m to 50 ⁇ m, more preferably 2 ⁇ m to 25 ⁇ m, and even more preferably 4 ⁇ m to 18 ⁇ m. By setting the thickness of the support 31 to 1 ⁇ m to 50 ⁇ m, it is preferable because warpage when formed into a molded body can be reduced.
- a colored support may be used, or the support 31 may be printed or coated.
- the thickness of the support 31 may be 50 ⁇ m or less (for example, 1 ⁇ m to 50 ⁇ m), 25 ⁇ m or less (for example, 1 ⁇ m to 25 ⁇ m), or 18 ⁇ m or less (for example, 1 ⁇ m to 18 ⁇ m). It may be 9 ⁇ m or less (for example, 1 ⁇ m to 9 ⁇ m).
- the graphite sheet 10 used in the present invention is a polymer graphite sheet.
- the polymer graphite sheet is obtained, for example, by carbonizing a polymer film by heat treatment and then graphitizing.
- thermal conductivity anisotropy having a thermal conductivity in the sheet surface direction of about 400 to 1700 W / (m ⁇ K) and a thermal conductivity in the thickness direction of about 5 to 20 W / (m ⁇ K).
- Those having the following are preferably used.
- Such a polymer graphite sheet having a high thermal conductivity anisotropy can be obtained by, for example, a known method.
- a graphite sheet obtained by heat-treating a polyimide film at a temperature of 2400 ° C. or higher can satisfy the above characteristics.
- the thickness of the graphite sheet 10 is preferably 1 ⁇ m to 250 ⁇ m, more preferably 3 ⁇ m to 150 ⁇ m, and even more preferably 5 ⁇ m to 100 ⁇ m. When the thickness is within the above range, the heat dissipation when the composite molded body of the present invention is used in an electronic device or the like is improved, and the composite molded body (in other words, an electronic device or the like) can be thinned. It is.
- the thickness of the graphite sheet 10 is particularly preferably 40 ⁇ m or less from the viewpoint of reducing the thickness of the composite molded body and increasing the fixing strength with the support.
- the thickness of the graphite sheet 10 is preferably 150 ⁇ m or less (for example, 1 ⁇ m to 150 ⁇ m), more preferably 100 ⁇ m or less (for example, 1 ⁇ m to 100 ⁇ m), further preferably 40 ⁇ m or less (for example, 1 ⁇ m to 40 ⁇ m), Most preferable is 25 ⁇ m or less (for example, 1 ⁇ m to 25 ⁇ m).
- the thickness is within the above range, the heat dissipation when the composite molded body of the present invention is used in an electronic device or the like is improved, and the composite molded body (in other words, an electronic device or the like) can be thinned. It is.
- the thickness of the graphite sheet 10 is the present invention. Is preferably 5% to 75%, more preferably 7% to 60%, still more preferably 10% to 50%, and particularly preferably 12% to 40%. If the thickness ratio of the graphite sheet 10 in the graphite sheet laminate is within the above range, the mechanical properties (rigidity, elasticity, etc.) and thermal properties (thermal linear expansion coefficient, etc.) of the graphite sheet laminate are mainly the properties of the support 31. Dominated by.
- the thickness of the graphite sheet 10 is preferably 5% to 75%, more preferably 7% to 60%, still more preferably 10% to 50%, and more preferably 12% of the entire graphite sheet laminate of the present invention. ⁇ 40% is particularly preferred. If the thickness ratio of the graphite sheet 10 in the graphite sheet laminate is in the above range, it is slightly inferior to that when the support 31 is formed, but compared with the prior art, the graphite sheet 10 at the time of injection molding. While deformation, crushing, and positional deviation are suppressed, warpage of the composite molded product due to the difference in the coefficient of thermal expansion between the injection molded resin and the graphite sheet 10 tends to be suppressed.
- the elastic modulus of the graphite sheet 10 itself is preferably 1 GPa or more, more preferably 5 GPa or more.
- the thickness of the graphite sheet 10 is preferably in the above range.
- the graphite sheet 10 preferably has a through hole.
- the porosity is preferably 2% to 40%, more preferably 3% to 30%, and still more preferably 5% to 20%. If the aperture ratio of the graphite film 10 is 2% or more, the through-holes act to alleviate the warp, and a resin molded body with a small warp can be obtained. Moreover, if the aperture ratio of the graphite film 10 is 40.0% or less, high heat dissipation can be maintained.
- the thickness of the graphite sheet laminate is preferably 250 ⁇ m or less, more preferably 150 ⁇ m or less, still more preferably 100 ⁇ m or less, and particularly preferably 80 ⁇ m or less.
- the thickness of the graphite sheet laminate is preferable because the warpage of the resin molded body can be reduced.
- the tensile strength is preferably 80 MPa or more, more preferably 150 MPa or more, and further preferably 200 MPa or more. By setting the tensile strength of the graphite sheet laminate to 80 MPa or more, breakage or breakage of the graphite sheet laminate during injection molding can be suppressed.
- the graphite sheet laminate of the present invention has a first fixed layer on one main surface of the graphite sheet. Further, the first fixed layer 55 is disposed in the mold so as to be in contact with the injection resin as shown in FIG. 1, and prevents the positional deviation of the graphite sheet laminate 81.
- the second fixed layer 51 may be formed on the main surface of the graphite sheet 10 opposite to the first fixed layer 55 as shown in FIG.
- the second fixed layer 51 plays a role of preventing positional deviation between the support and the graphite sheet 10 when forming a support as described later. Further, even when there is no support, the weakness of the mechanical strength of the graphite sheet 10 is reinforced, and a function of suppressing breakage and breakage is exhibited.
- the support 31 may be formed on the surface of the graphite sheet 10 opposite to the second fixed layer 51.
- the support 31 reinforces the weak mechanical strength of the graphite sheet 10 and expresses a function of suppressing the breakage and breakage of the graphite sheet 10.
- the first fixed layer 55 covers the side periphery of the graphite sheet 10 as shown in FIG.
- the graphite sheet 10 may be sealed by the two fixed layers 51) and the first fixed layer 55.
- the side surface of the graphite sheet 10 may be covered with the second fixed layer 51.
- both the second fixed layer 51 and the first fixed layer 55 may cover the side surface of the graphite sheet 10.
- FIG. 5 is a diagram illustrating a resin molded body 100 according to an embodiment, where (A) is a plan view and (B) is a cross-sectional view.
- the resin molded body 100 of the present invention is obtained by integrally molding a graphite sheet laminate 80 and a resin 90.
- the resin molded body can be manufactured by an insert molding method in which a graphite sheet laminate 81 is placed in a molding die as shown in FIG. 1 and then a resin material is injection molded into the die.
- die used for the manufacturing method of this invention is not specifically limited, The thing used for general injection molding can be used.
- the graphite sheet laminate 81 is arranged so that the main surface of the graphite sheet laminate 81 opposite to the first fixed layer 55 side contacts the cavity surface 110 of one injection mold.
- the injection mold is clamped and the molten resin is injected into the cavity (in other words, the cavity surface 110 of one injection mold and the opposing surface 120 of the other injection mold).
- the graphite sheet laminate 81 and the resin are bonded. That is, the graphite sheet laminate 81 is disposed in the mold so that the first fixed layer 55 is in contact with the introduced resin.
- the main surface on the opposite side to the 1st fixed layer 55 side of the graphite sheet laminated body 81 is formed as a part of surface layer of a resin molding.
- the installation position of the graphite sheet laminate 81 in the mold is not particularly limited, but it is preferable that the graphite sheet laminate 81 is installed immediately below the resin inlet. Immediately below the resin inlet, the resin injection pressure has a large pressure component in the direction perpendicular to the surface of the graphite sheet laminate 81, and is therefore pressed against the graphite sheet laminate 81 toward the mold wall surface. Power is granted. On the other hand, since the pressure component in the plane direction of the graphite sheet laminate 81 is small, the shear force to the graphite sheet laminate 81 due to the injection pressure of the resin is suppressed, and the positional deviation caused by the graphite sheet 10 being flowed by the injection pressure, Deformation of the graphite sheet 10 can be prevented.
- the graphite sheet laminate 81 is disposed at a position farthest from the resin inlet in the mold. At a position away from the resin inlet, since the injection pressure is reduced due to pressure loss, the shearing force applied to the graphite sheet laminate 81 is suppressed, the positional deviation of the graphite sheet 10, the deformation of the graphite sheet 10, etc. Can be prevented.
- the thickness of the cavity of the portion where the graphite sheet laminate 81 is formed is When the thickness is 1.0 mm or less, further 0.8 mm or less, and particularly 0.6 mm or less, the injection pressure applied to the graphite sheet laminate 81 is increased, so that the displacement and deformation of the inserted material are likely to occur. If the graphite sheet laminate 81 of the present invention is used, it is possible to perform injection molding without positional displacement or deformation.
- the resin used for the injection molding of the present invention is not particularly limited, and a resin used for general injection molding can be used.
- the resin used for injection molding includes polyethylene, polypropylene, polyvinyl chloride, polyvinyl acetate, polystyrene, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer ( EMMA), vinyl polymers such as acrylonitrile-styrene copolymer (AS), acrylonitrile-butadiene-styrene copolymer (ABS), polyester polymers such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyarylate, nylon Polyamide polymers such as nylon 6, nylon 6,6, polyacetal, polyphenylene sulfide (PPS), liquid crystalline polyester, polyimide, polyamideimide, syndiotactic polysty
- a fiber reinforced resin containing glass fiber or carbon fiber is preferably used.
- Such a fiber reinforced resin has a high melt viscosity and tends to increase the pressure of the resin during injection molding. For this reason, when the graphite sheet is used alone for injection molding, appearance defects due to deformation of the graphite sheet and displacement of the graphite sheet are likely to occur.
- a graphite sheet laminate in which a graphite sheet is fixed to a support is used, even when a fiber reinforced resin having a high melt viscosity is used, poor appearance and misalignment are suppressed.
- by adjusting the characteristics of the surface of the support it is possible to improve the slipperiness of the surface and reduce the shear stress on the graphite sheet laminate due to the injection pressure of the resin.
- the above-described support is not an essential component.
- the present invention even when there is no support, even when a fiber reinforced resin having a higher melt viscosity is used as compared with the prior art, poor appearance and misalignment are suppressed.
- the present invention can also reduce the shear stress to the graphite sheet laminate due to the injection pressure of the resin, even when there is no support, compared to the prior art.
- the introduced resin temperature at the time of injection molding of the present invention conditions used for general injection molding can be used.
- the graphite sheet has a high thermal conductivity in the plane direction and a low thermal conductivity in the thickness direction, it has a heat insulating effect on a resin layer, a support, and the like disposed adjacent to each other. Therefore, when injection molding is performed on the surface on the graphite sheet side of the graphite sheet laminate, even when the resin temperature is slightly higher than the heat resistance temperature of the resin layer or the support, it is possible to suppress alteration due to heat.
- the introduced resin temperature during the injection molding of the present invention is 230 ° C. or higher, 260 ° C. or higher, 290 ° C. or higher, and 310 ° C. or higher
- the heat applied to the graphite sheet laminate increases.
- injection molding can be performed without positional displacement or deformation.
- the present invention can also be configured as follows.
- a first fixed layer having an elastic modulus of 7.0 ⁇ 10 4 Pa or more and 5.0 ⁇ 10 7 Pa or less at an introduced resin temperature at the time of injection molding is provided on at least one main surface of the graphite sheet.
- the present invention relates to a method for producing a resin molded body, wherein the mold is clamped and a molten resin is injected into a cavity to bond the graphite sheet laminate and the resin.
- the second principal surface of the graphite sheet laminate opposite to the first fixed layer side has an elastic modulus of 7.0 ⁇ 10 4 Pa to 5.0 ⁇ 10 8 Pa at the introduced resin temperature during injection molding. It is related with the manufacturing method of the resin molding as described in ⁇ 1> characterized by the above-mentioned.
- ⁇ 4> The production of the resin molded body according to any one of ⁇ 1> to ⁇ 3>, wherein a support is formed on a main surface opposite to the graphite sheet of the second fixed layer. Regarding the method.
- the elastic modulus On one main surface of the graphite sheet, at 80 ° C., the elastic modulus is 1.0 ⁇ 10 4 Pa or more and 5.0 ⁇ 10 6 Pa or less, and at 250 ° C., the elastic modulus is 7.0 ⁇ 10 4 Pa or more.
- the present invention relates to a graphite sheet laminate including a configuration in which a first fixed layer of 0.0 ⁇ 10 7 Pa or less is in contact with a graphite sheet.
- the elastic modulus at 80 ° C. is 1.0 ⁇ 10 4 Pa or more and 5.0 ⁇ 10 7 Pa or less on the other main surface of the graphite sheet, and the elastic modulus is 7.0 ⁇ 10 4 Pa at 250 ° C. or 5.0 second fixing layer is less ⁇ 10 8 Pa relates graphite sheet laminate according to ⁇ 5> comprising the structure in contact with the graphite sheet.
- the first fixed layer relates to the graphite sheet laminate according to ⁇ 5> or ⁇ 6>, wherein an elastic modulus at 250 ° C. is higher than an elastic modulus at 80 ° C.
- the second fixed layer relates to the graphite sheet laminate according to any one of ⁇ 5> to ⁇ 7>, wherein an elastic modulus at 250 ° C. is higher than an elastic modulus at 80 ° C.
- the second fixed layer is formed on the side opposite to the main surface of the graphite sheet, and the support is formed on the surface opposite to the graphite sheet of the second fixed layer ⁇ 6 >- ⁇ 8>
- the moldability of the resin molded body was evaluated according to the following criteria.
- A The warp cannot be confirmed visually (the warp amount is less than 2.0 mm).
- B Warpage can be confirmed visually, and the amount of warpage is 2.0 mm or more [fixed layer].
- [Fixed layer] The following materials were used as the first fixed layer and the second fixed layer.
- the elastic moduli of the fixed layers A to C are shown in Table 1.
- Example 1 ⁇ Production of graphite sheet laminate>
- a polyethylene terephthalate film (PET) having a thickness of 18 ⁇ m was used.
- Acrylic resin B (fixed layer C) as a second fixing layer was formed on one surface of the support, and the thickness after drying was 18 ⁇ m. It applied so that it might become.
- a 40 ⁇ m thick graphite sheet (thermal conductivity 1500 W / (m ⁇ K)) was placed on the acrylic resin B (fixed layer C), and the support and the graphite sheet were fixed. Thereafter, as shown in FIG. 3, a graphite sheet laminate 85 was obtained in which acrylic resin B (fixed layer C) was further formed with a thickness of 10 ⁇ m as the first fixed layer.
- the above graphite sheet laminate 85 cut to a size of 40 mm ⁇ 60 mm is arranged so that the PET film side surface is in contact with the inner surface of the mold, and the first fixed layer of the graphite sheet laminate is a resin as shown in FIG. It installed in the metal mold
- 30% glass fiber reinforced polycarbonate was injection molded, and the graphite sheet laminate 85 was inserted into the molded body so as to be exposed on the surface of the molded body, thickness 0.6 mm, size 60 A x120 mm graphite sheet-resin composite molded body was obtained.
- the graphite sheet laminate 85 was fixed in the mold by the suction port 45.
- the mold temperature was 80 ° C.
- the resin introduction temperature for introducing the injection resin was 310 ° C.
- the results are shown in Table 2.
- Example 1 It is the same as that of Example 1 except having used the epoxy film (fixed layer B) instead of acrylic resin B (fixed layer C) as a 1st fixed layer.
- the epoxy film is a semi-cured (B stage) epoxy film and a graphite sheet, which is held by hot pressing at 80 ° C. and normal pressure for 30 minutes, and then at 130 ° C. and a pressure of 5 kg / cm 2 . It was formed by holding for a minute and curing the epoxy resin. The results are shown in Table 2.
- Example 2 It is the same as that of Example 1 except having used acrylic resin A (fixed layer A) instead of acrylic resin B (fixed layer C) as a 1st fixed layer. The results are shown in Table 2.
- Comparative Example 2 since the elastic modulus at 250 ° C. was too high, the adhesion between the injection resin and the graphite laminate was poor and the positional deviation of the graphite sheet laminate occurred. The positional deviation of the graphite sheet laminate was improved by reducing the rate.
- the positional deviation of the graphite sheet laminate could be eliminated by adjusting the elastic modulus at 250 ° C. to 9.6 ⁇ 10 5 as in Example 1.
- Example 2 The same as Example 1 except that a 50 ⁇ m thick polyethylene terephthalate film (PET) was used. The results are shown in Table 3.
- Example 3 The same as Example 1 except that a 25 ⁇ m thick polyethylene terephthalate film (PET) was used. The results are shown in Table 3.
- Example 4 The same as Example 1 except that a polyethylene terephthalate film (PET) having a thickness of 9 ⁇ m was used. The results are shown in Table 3.
- PET polyethylene terephthalate film
- Example 5 An acrylic resin B (fixed layer C) having a thickness of 30 ⁇ m was formed as a first fixed layer on a graphite sheet having a thickness of 40 ⁇ m (thermal conductivity 1500 W / (m ⁇ K)) to obtain a graphite sheet laminate.
- the graphite sheet laminate is disposed so that the graphite sheet surface is in contact with the inner surface of the mold, and the injection molding is performed so that the first fixed layer of the graphite sheet laminate is the resin injection surface as shown in FIG.
- the graphite sheet laminate was placed in the mold of the machine and injection molding was performed. The rest is the same as in the first embodiment. The results are shown in Table 3.
- Example 5 is the same as Example 5 except that the acrylic resin B (fixed layer C) is formed with a thickness of 10 ⁇ m as the first fixed layer. The results are shown in Table 3.
- Example 1 is the same as Example 1 except that the graphite sheet itself is used instead of the graphite sheet laminate.
- Example 3 In Comparative Example 3 using a single graphite sheet having a low tensile strength, the graphite sheet was torn due to the momentum of the resin at the time of injection, and a molded body in which the graphite sheet was combined could not be obtained.
- Example 6 in which the first fixed layer having a thickness of 10 ⁇ m was formed on the graphite sheet, the first fixed layer reinforces the strength of the graphite sheet. Moreover, when the 30-micrometer-thick 1st fixed layer was formed, it was able to suppress both a tear and a crease
- the PET film as a support reinforced the graphite sheet, so that the film was broken or broken. I was able to suppress it.
- the thickness of the support was as thick as 50 ⁇ m as in Example 2, warping occurred in the molded body.
- Example 7 Example 1 is the same as Example 1 except that a polyethylene naphthalate film (PEN) was used instead of the polyethylene terephthalate film (PET). The results are shown in Table 4.
- PEN polyethylene naphthalate film
- PET polyethylene terephthalate film
- Example 8 Through holes having a diameter of 0.20 mm were formed in the graphite sheet by NC drilling with a through hole pitch of 0.50 mm (opening ratio 12.6%), and a graphite sheet having through holes was obtained.
- Example 2 is the same as Example 2 except that a graphite sheet having through holes is used as the graphite sheet. The results are shown in Table 5.
- Example 9 Example 1 is the same as Example 1 except that an acrylic resin D (fixed layer E) is formed with a thickness of 10 ⁇ m as the first fixed layer. The results are shown in Table 2.
- Comparative Example 1 the elastic modulus of the first fixed layer at 250 ° C. was too low and the positional deviation of the graphite laminate occurred. However, by increasing the elastic modulus of the first fixed layer as in Example 9, the graphite The misalignment of the laminate was improved.
- Example 10 is the same as Example 1 except that an acrylic resin C (fixed layer D) is formed with a thickness of 10 ⁇ m as the first fixed layer. The results are shown in Table 2.
- Example 11 The same as Example 1 except that the thickness of the graphite sheet was 150 ⁇ m. The results are shown in Table 6.
- Example 12 The same as Example 1 except that the thickness of the graphite sheet was 100 ⁇ m. The results are shown in Table 6.
- Example 13 The same as Example 1 except that the thickness of the graphite sheet was 25 ⁇ m. The results are shown in Table 6.
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Abstract
Description
第一固定層55は、射出樹脂と接触するように図1のように金型21内にセットされ、グラファイトシート積層体81が成形体に対してズレることなく配置されるための役割を果たす。第一固定層55は、導入樹脂温度における弾性率が、7.0×104Pa以上5.0×107Pa以下、好ましくは8.5×104Pa以上3.0×107Pa以下、より好ましくは1.0×105Pa以上1.0×107Pa以下のものを選定するのが良い。また、樹脂導入温度は、230℃以上350℃以下(例えば、250℃または310℃)であることが好ましい。第一固定層55の導入樹脂温度における弾性率が、7.0×104Pa以上5.0×107Pa以下であれば、導入される樹脂の導入温度が300℃以上になる場合もある射出成形であっても、第一固定層55が流されず、表面活性が低く、他材料との接着性が低いグラファイトシート10を用いた場合であっても、グラファイトシート積層体81を樹脂成形体の所望の位置に設置することができる。また、第1固定層55の弾性率を適度な柔らかさに設定することで、第1固定層55は、タック性を有し、導入された樹脂(つまり成形体を形成する樹脂)との接着性を発揮し、位置ズレや接着不良を抑制することができる。
本発明のグラファイトシート積層体80には、図2のようにグラファイトシート10の第一固定層55側と反対側の主面に第二固定層51が形成されていても良い。第二固定層51は、後述するような支持体を形成する場合には、支持体とグラファイトシート10との位置ズレを防止する役割を果たす。また、第二固定層51は、支持体がない場合にも、グラファイトシート10の機械強度の弱さを補強し、グラファイトシート10の破れや折れを抑制する機能を発現する。
グラファイトシート積層体には、支持体が固着されていることが好ましい。支持体とは、グラファイトシートの機械的強度を補強するための材料であり、図3のように、グラファイトシート10が支持体31に固着されることにより、グラファイトシート積層体85は、グラファイトシート10単体の場合に比して高い機械特性(剛性および弾性)を有することができる。このグラファイトシート積層体85を射出成形(インサート成形)に供することで、射出成形時の樹脂圧力(射出圧)に起因するグラファイトシート10の破断や折れ等の不具合を防ぐことができる。
本発明で用いるグラファイトシート10は、高分子グラファイトシートである。高分子グラファイトシートは、例えば、高分子フィルムが熱処理によって炭素化され、ついでグラファイト化されることによって得られる。高分子グラファイトシートとしては、例えばシート面方向の熱伝導が400~1700W/(m・K)程度、厚さ方向の熱伝導度が5~20W/(m・K)程度の熱伝導異方性を有するものが好適に用いられる。このような熱伝導異方性の高い高分子グラファイトシートは、例えば、公知の方法により得られる。例えば、ポリイミドフィルムを2400℃以上の温度で熱処理して得られるグラファイトシートは上記の特性を満たし得る。
グラファイトシート積層体の厚みとしては、好ましくは250μm以下、より好ましくは150μm以下、さらに好ましくは100μm以下、特に好ましくは80μm以下である。グラファイトシート積層体の厚みを250μm以下とすることで、樹脂成形体の反りも低減できるため良い。
グラファイトシート積層体の強度としては、引張り強度が、好ましくは80MPa以上、より好ましくは150MPa以上、さらに好ましくは200MPa以上である。グラファイトシート積層体の引張り強度を80MPa以上とすることで、射出成形時のグラファイトシート積層体の破断や折れなどを抑制することができる。
本発明のグラファイトシート積層体は、グラファイトシートの一方の主面に第一固定層を有する。また、第一固定層55は、図1のように射出樹脂と接するように金型内に配置され、グラファイトシート積層体81の位置ズレを防止する。
図5は、一実施形態にかかる樹脂成形体100を表す図であり、(A)は平面図、(B)は断面図である。本発明の樹脂成形体100は、グラファイトシート積層体80と樹脂90とが一体成形されたものである。
樹脂成形体は、図1のようにグラファイトシート積層体81を成形金型内に配置した後、その金型内に樹脂材料を射出成形するインサート成形法によって製造され得る。本発明の製造方法に用いられる金型は、特に限定されず、一般の射出成形に用いられているものが使用できる。
、グラファイトシート積層体81と樹脂とを接着させる。つまり、第一固定層55が導入樹脂と接触するように、グラファイトシート積層体81は金型内に配置される。そして、グラファイトシート積層体81の第一固定層55側と反対側の主面は、樹脂成形体の表面層の一部として形成されることになる。
本発明の射出成形に用いる樹脂としては、特に限定されず、一般的な射出成形に用いられる樹脂が使用できる。射出成形に用いられる樹脂としては、ポリエチレン、ポリプロピレン、ポリ塩化ビニル、ポリ酢酸ビニル、ポリスチレン、エチレン‐酢酸ビニル共重合体(EVA)、エチレン-アクリル酸共重合体、エチレン-メタクリル酸共重合体(EMMA)、アクリロニトリル-スチレン共重合体(AS)、アクリロニトリル-ブタジエン-スチレン共重合体(ABS)等のビニル系ポリマー、ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンテレフタレート、ポリアリレート等のポリエステル系ポリマー、ナイロン6やナイロン6,6等のポリアミド系ポリマー、ポリアセタール、ポリフェニレンサルファイド(PPS)、液晶性ポリエステル、ポリイミド、ポリアミドイミド、シンジオタクチックポリスチレン、フッ素系ポリマー、変性ポリフェニレンエーテル、ポリエーテルサルフォン(PES)、芳香族ポリエーテルケトン(PEK)、ポリエーテルエーテルケトン(PEEK)、ポリカーボネート、液晶ポリマー、ポリサルフォン(PSF)、ポリアミドイミド、ポリエーテルイミド、その他のエンジニアリングプラスチック、スーパーエンジニアリングプラスチック等が挙げられる。
本発明の射出成形時の導入樹脂温度は、一般的な射出成形に用いられる条件が使用できる。なお、グラファイトシートは面方向に熱伝導率が高く、厚み方向への熱伝導率が低いため、隣接して配置される樹脂層や支持体等に対して断熱効果を有する。そのため、グラファイトシート積層体のグラファイトシート側の面に射出成形が行われる場合は、樹脂温度が、樹脂層や支持体の耐熱温度を多少上回る場合でも、熱による変質を抑制することができる。
<引張強度の測定>
グラファイトシート積層体の引張強度の測定には、引張試験機(東洋精機製作所製 ストログラフVES1D)を用い、JIS K 7078に準拠して測定を行った。測定は、チャック間距離100mm、引張速度50mm/分、室温下(25℃の雰囲気)で行い、3回測定した際の平均値を引張強度とした。
<位置ズレ>
樹脂成形体におけるグラファイトシート積層体の位置ズレの有無は、目視による評価および面積保持率により評価した。面積保持率は、複合積層体のグラファイトシート(GS)のうち、金型内の配置場所(30mm×30mmの領域)内で保持されている部分の面積率(%)である。また、目視による評価は、以下の基準によりおこなった。
A:グラファイトシート積層体が、金型内に配置した場所からずれることなく、元の面形
状を保持している状態
B:グラファイトシート積層体が金型内に配置した場所からわずかにずれているが、成形体の中に保持されている状態
<外観(形態保持性)>
複合成形体の外観は、グラファイトシート積層体の皺・割れ・破れの状態を目視で評価した。
B:グラファイトシート積層体に皺が入ったが、割れがない状態
C:グラファイトシート積層体が割れて元の大きさを保持できず、ばらばらになった状態(インサート成形では複合成形体が得られない)
<反り>
樹脂成形品を水平面上に載置した際の反り量(水平面から成形品の端面までの距離)により評価した。
B:目視にて反りが確認でき、反り量は2.0mm以上[固定層]。
第一固定層、第二固定層として、下記の材料を用いた。尚、固定層A~固定層Cの弾性率を表1に示す。
<固定層A>
アクリル系樹脂A(日栄加工社製、NeoFix10)
<固定層B>
エポキシフィルム(トーヨーケム社製、TSU0041SI-10DL)
<固定層C>
アクリル系樹脂B(十条ケミカル社製、JELCONバインダーインキ G-2S)
<固定層D>
アクリル系樹脂C
<固定層E>
アクリル系樹脂D
<弾性率の測定>
ティー・エー・インスツルメント社製動的粘弾性測定装置ARESを用い、サンプル厚み0.5mm、周波数1Hz、昇温速度5℃/min、25℃~320℃の温度域で測定した。
<グラファイトシート積層体の作製>
支持体として、厚み18μmのポリエチレンテレフタレートフィルム(PET)を用い、この支持体の一方の面の全体に、第二固定層としてアクリル系樹脂B(固定層C)を、乾燥後の厚みが18μmとなるように塗布した。このアクリル系樹脂B(固定層C)上に、厚み40μmのグラファイトシート(熱伝導率1500W/(m・K))を載せ、支持体とグラファイトシートとを固着した。その後、図3のように、第一固定層として、さらにアクリル系樹脂B(固定層C)が10μmの厚みで形成された、グラファイトシート積層体85を得た。
40mm×60mmの大きさにカットした上記のグラファイトシート積層体85を、PETフィルム側の面が金型内面と接するように配置し、図1のようにグラファイトシート積層体の第一固定層が樹脂射出面となるように、射出成形機の金型内に設置した。次いで、30%ガラス繊維強化ポリカーボネートを射出成形して、グラファイトシート積層体85が成形体の内部であって、かつ、成形体の表面に露出するように挿入された、厚み0.6mm、サイズ60×120mmのグラファイトシート-樹脂複合成形体を得た。グラファイトシート積層体85の金型内への固定は、吸引口45により行った。金型温度は80℃、射出樹脂を導入する樹脂導入温度は310℃であった。結果を表2に示す。
第一固定層としてアクリル系樹脂B(固定層C)の代わりに、エポキシフィルム(固定層B)を用いたこと以外は実施例1と同様である。尚、エポキシフィルムは、半硬化(Bステージ)のエポキシフィルムとグラファイトシートとを貼り合わせ、熱プレスにより80℃、常圧にて30分保持後、130℃、5kg/cm2の圧力にて90分保持し、エポキシ樹脂を硬化させることで形成した。結果を表2に示す。
第一固定層としてアクリル系樹脂B(固定層C)の代わりに、アクリル系樹脂A(固定層A)を用いたこと以外は実施例1と同様である。結果を表2に示す。
厚み50μmのポリエチレンテレフタレートフィルム(PET)を用いたこと以外は、実施例1と同様である。結果を表3に示す。
厚み25μmのポリエチレンテレフタレートフィルム(PET)を用いたこと以外は、実施例1と同様である。結果を表3に示す。
厚み9μmのポリエチレンテレフタレートフィルム(PET)を用いたこと以外は、実施例1と同様である。結果を表3に示す。
厚み40μmのグラファイトシート(熱伝導率1500W/(m・K))に、第一固定層としてアクリル系樹脂B(固定層C)を厚み30μmで形成し、グラファイトシート積層体を得た。射出成形においては、グラファイトシート積層体のグラファイトシート面が金型内面と接するように配置し、図1のように、グラファイトシート積層体の第一固定層が樹脂射出面となるように、射出成形機の金型内にグラファイトシート積層体を設置し射出成形を行った。それ以外は実施例1と同様である。結果を表3に示す。
第一固定層としてアクリル系樹脂B(固定層C)を厚み10μmで形成したこと以外は実施例5と同様である。結果を表3に示す。
グラファイトシート積層体の代わりにグラファイトシートそのものを用いたこと以外は、実施例1と同様である。
ポリエチレンテレフタレートフィルム(PET)の代わりにポリエチレンナフタレートフィルム(PEN)を用いたこと以外は実施例1と同様である。結果を表4に示す。
グラファイトシートにNCドリル加工にて直径0.20mmの貫通孔を貫通孔ピッチ0.50mmで形成し(開孔率12.6%)、貫通孔を有するグラファイトシートを得た。グラファイトシートとして、貫通孔を有するグラファイトシートを用いたこと以外は、実施例2と同様である。結果を表5に示す。
第一固定層としてアクリル系樹脂C(固定層D)を厚み10μmで形成したこと以外は実施例1と同様である。結果を表2に示す。
グラファイトシートの厚みを150μmとしたこと以外は実施例1と同様である。結果を表6に示す。
グラファイトシートの厚みを100μmとしたこと以外は実施例1と同様である。結果を表6に示す。
グラファイトシートの厚みを25μmとしたこと以外は実施例1と同様である。結果を表6に示す。
21 :金型
31 :支持体
40 :ゲート
41 :樹脂導入部
42 :熱電対
45 :吸引口
51 :第二固定層
55 :第一固定層
80、81、82、85:グラファイトシート積層体
90 :樹脂
100 :樹脂成形体
110 :キャビティー面
120 :対向面
Claims (15)
- グラファイトシートの少なくとも一方の主面に、射出成形時の導入樹脂温度において弾性率が7.0×104Pa以上5.0×107Pa以下となる第一固定層が接触する構成を含むグラファイトシート積層体を、一方の射出成形型のキャビティー面にグラファイトシート積層体の第一固定層側と反対側の主面が接触するように沿わせた後で、射出成形型を型締めしてキャビティーに溶融状態の樹脂を射出してグラファイトシート積層体と樹脂とを接着させることを特徴とする樹脂成形体の製造方法。
- グラファイトシートの少なくとも一方の主面に、250℃での弾性率が7.0×104Pa以上5.0×107Pa以下となる第一固定層が接触する構成を含むグラファイトシート積層体を、一方の射出成形型のキャビティー面にグラファイトシート積層体の第一固定層側と反対側の主面が接触するように沿わせた後で、射出成形型を型締めしてキャビティーに溶融状態の樹脂を射出してグラファイトシート積層体と樹脂とを接着させることを特徴とする樹脂成形体の製造方法。
- グラファイトシートの第一固定層側と反対側の主面には、射出成形時の導入樹脂温度で弾性率が7.0×104Pa以上5.0×108Pa以下となる第二固定層が形成されていることを特徴とする請求項1または2に記載の樹脂成形体の製造方法。
- 射出成形時の導入樹脂温度が230℃以上350℃以下であることを特徴とする請求項1~3の何れか1項に記載の樹脂成形体の製造方法。
- 更に、第二固定層のグラファイトシートと反対側の主面には、支持体が形成されていることを特徴とする請求項1~4の何れか1項に記載の樹脂成形体の製造方法。
- 支持体の厚みが、1μm~50μmであることを特徴とする請求項5に記載の樹脂成形体の製造方法。
- グラファイトシートの厚みが、グラファイトシート積層体の厚みの5%~75%であることを特徴とする請求項1~6の何れか1項に記載の樹脂成形体の製造方法。
- グラファイトシートの少なくとも一方の主面に、250℃での弾性率が7.0×104Pa以上5.0×107Pa以下である第一固定層がグラファイトシートと接触している構成を含むことを特徴とするグラファイトシート積層体。
- 第一固定層は、80℃での弾性率が1.0×104Pa以上5.0×106Pa以下のものであることを特徴とする請求項8に記載のグラファイトシート積層体。
- 第一固定層は、250℃における弾性率が80℃における弾性率よりも高いことを特徴とする請求項8または9に記載のグラファイトシート積層体。
- グラファイトシートの第一固定層側と反対側の主面に、80℃での弾性率が1.0×104Pa以上5.0×107Pa以下、250℃での弾性率が7.0×104Pa以上5.0×108Pa以下である第二固定層がグラファイトシートと接触している構成を含むことを特徴とする請求項8~10の何れか1項に記載のグラファイトシート積層体。
- 第二固定層は、250℃における弾性率が80℃における弾性率よりも高いことを特徴とする請求項11に記載のグラファイトシート積層体。
- 第二固定層は、グラファイトシートの第一固定層側と反対側の主面に形成され、
更に、支持体が、第二固定層のグラファイトシートとは反対側の主面に形成されていることを特徴とする請求項11または12に記載のグラファイトシート積層体。 - 支持体の厚みが、1μm~50μmであることを特徴とする請求項13に記載のグラファイトシート積層体。
- グラファイトシートの厚みが、グラファイトシート積層体の厚みの5%~75%であることを特徴とする請求項8~14の何れか1項に記載のグラファイトシート積層体。
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| CN201480006911.3A CN105102200B (zh) | 2013-02-01 | 2014-01-30 | 树脂成形体的制造方法及石墨膜层积体 |
| US14/765,053 US9878521B2 (en) | 2013-02-01 | 2014-01-30 | Method for producing resin molded body and graphite sheet laminate |
| JP2014559741A JP6239533B2 (ja) | 2013-02-01 | 2014-01-30 | 樹脂成形体の製造方法、及びグラファイトシート積層体 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016104759A1 (ja) * | 2014-12-25 | 2016-06-30 | 株式会社カネカ | 熱輸送構造体およびその製造方法 |
| WO2019176203A1 (ja) * | 2018-03-14 | 2019-09-19 | パナソニックIpマネジメント株式会社 | リアクトル装置 |
| KR102951133B1 (ko) * | 2019-11-29 | 2026-04-13 | 도레이 카부시키가이샤 | 샌드위치 구조체 및 그 제조 방법 |
| KR102951132B1 (ko) * | 2019-11-29 | 2026-04-13 | 도레이 카부시키가이샤 | 샌드위치 구조체 및 그 제조 방법 |
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| JP2012045920A (ja) * | 2010-07-30 | 2012-03-08 | Mitsubishi Plastics Inc | 樹脂・金属複合積層体、樹脂・金属複合射出成形体、及びその製造方法 |
| JP5575688B2 (ja) | 2011-03-31 | 2014-08-20 | 三井物産プラスチック株式会社 | 携帯電子機器 |
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- 2014-01-29 TW TW103103683A patent/TWI589424B/zh not_active IP Right Cessation
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| WO2016104759A1 (ja) * | 2014-12-25 | 2016-06-30 | 株式会社カネカ | 熱輸送構造体およびその製造方法 |
| JPWO2016104759A1 (ja) * | 2014-12-25 | 2017-11-24 | 株式会社カネカ | 熱輸送構造体およびその製造方法 |
| US10710333B2 (en) | 2014-12-25 | 2020-07-14 | Kaneka Corporation | Heat transport structure and manufacturing method thereof |
| WO2019176203A1 (ja) * | 2018-03-14 | 2019-09-19 | パナソニックIpマネジメント株式会社 | リアクトル装置 |
| JPWO2019176203A1 (ja) * | 2018-03-14 | 2021-03-11 | パナソニックIpマネジメント株式会社 | リアクトル装置 |
| JP7117516B2 (ja) | 2018-03-14 | 2022-08-15 | パナソニックIpマネジメント株式会社 | リアクトル装置 |
| KR102951133B1 (ko) * | 2019-11-29 | 2026-04-13 | 도레이 카부시키가이샤 | 샌드위치 구조체 및 그 제조 방법 |
| KR102951132B1 (ko) * | 2019-11-29 | 2026-04-13 | 도레이 카부시키가이샤 | 샌드위치 구조체 및 그 제조 방법 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105102200A (zh) | 2015-11-25 |
| JP6239533B2 (ja) | 2017-11-29 |
| JPWO2014119666A1 (ja) | 2017-01-26 |
| US20150375480A1 (en) | 2015-12-31 |
| US9878521B2 (en) | 2018-01-30 |
| TWI589424B (zh) | 2017-07-01 |
| CN105102200B (zh) | 2017-06-20 |
| TW201438868A (zh) | 2014-10-16 |
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