JP6848240B2 - Electromagnetic wave shield lid material and its manufacturing method - Google Patents

Description

The present invention relates to a lid material that provides electromagnetic wave shielding performance, and more specifically, a part of a metal member having a prismatic shape with an open upper bottom surface is integrated with a specific polyphenylene sulfide resin composition member. It is a lid material made of plastic, and is related to a lid material for electromagnetic wave shielding which is excellent in light weight, rigidity, cold heat resistance and productivity.

In recent years, many electric and electronic devices such as motor control devices and power supply devices have been installed in transport device devices such as automobiles, railroad vehicles, and aircraft, and in order to prevent malfunction of the electric and electronic devices. Electromagnetic wave shielding performance with high electric field shielding property is required. In addition, transport aircraft equipment is required to be lightweight in consideration of the environment while maintaining cold heat resistance and rigidity that can withstand harsh cold and vibration environments.

When electrical / electronic equipment is mounted on a transportation machine such as an automobile, a railroad vehicle, or an aircraft, it is often the case that a plurality of parts such as capacitors, semiconductors, and IC circuits are integrated into a modular component as a system.

In recent years, module parts have been increasing in size as the number of parts has increased. In general, a method of storing this module component in a metal housing having excellent rigidity such as aluminum die casting and excellent electromagnetic wave shielding performance to prevent malfunction has been proposed (see, for example, Patent Document 1). ..

Further, from the viewpoint of weight reduction, a method of storing the module parts in a resin housing has also been proposed (see, for example, Patent Documents 2 and 3).

Further, as a method of using a metal housing and a resin housing in combination, a composite molded body in which a low melting point metal at 250 ° C. or lower and a resin are integrated by heat fusion by a two-color molding method has been proposed ( For example, see Patent Document 4).

Japanese Unexamined Patent Publication No. 10-270888 Japanese Unexamined Patent Publication No. 2012-5244 Japanese Unexamined Patent Publication No. 2004-269664 Japanese Unexamined Patent Publication No. 2014-156100

However, the metal housing proposed in Patent Document 1 has problems such as being heavy and inferior in productivity. Further, the resin housing proposed in Patent Documents 2 and 3 has a problem that the rigidity is inferior to that of the metal housing. Further, the composite molded body proposed in Patent Document 4 has a problem that it is inferior in rigidity because it uses a low melting point metal, and the low melting point metal and the resin are heat-sealed by two-color molding. Therefore, there was a problem that the cold heat resistance was inferior.

As a result of diligent studies to solve the above problems, the present inventor has produced a metal composite lid material in which a part of the lid material for electromagnetic wave shielding is integrated with a polyphenylene sulfide resin composition member in terms of light weight, cold heat resistance, rigidity and production. We have found that it can be a lid material for electromagnetic wave shielding with excellent productivity, and have completed the present invention.

That is, the present invention is a lid material for electromagnetic wave shielding having a prismatic shape with an open upper bottom surface, and the side surface and the lower bottom surface forming the prismatic shape are metal whose surfaces are physically and / or chemically treated. It relates to a lid material for electromagnetic wave shielding, which is a flat plate made of metal, and a side portion which is an integrated joint portion of the flat plate portion made of metal is a polyphenylene sulfide resin composition member having a volume specific resistance of 10 Ω · cm or less. is there.

Hereinafter, the present invention will be described in detail.

The lid material for electromagnetic wave shielding of the present invention is an article having a prismatic shape with an opening on the upper and lower surfaces, and it is not possible to insert a module component through the opening, enclose and seal the module component itself, and perform electromagnetic wave shielding. Of course, it is also possible to use it as a lid for module components such as capacitors, semiconductors, and IC circuits on the substrate constituting the module component, and to enclose these components between the module components to shield electromagnetic waves.

The prismatic shape with an open upper bottom surface, which is the shape of the lid material for electromagnetic wave shielding of the present invention, may be any shape as long as it is a prismatic shape with an open upper bottom surface, for example, the upper bottom surface is open. Various prisms such as triangular prisms, square prisms, pentagonal prisms, and hexagonal prisms can be mentioned.

The metal flat plate constituting the lower bottom surface and the side surface of the electromagnetic wave shielding lid material of the present invention is a metal flat plate obtained by chemically and / or physically treating the metal surface, and belongs to the category of the metal flat plate. Any material may be used, and since the obtained lid material for electromagnetic wave shielding can be applied to various uses of electromagnetic wave shielding, aluminum flat plate, aluminum alloy flat plate, magnesium flat plate, magnesium alloy flat plate, etc. Iron flat plates, stainless steel flat plates, titanium flat plates, copper flat plates, and copper alloy flat plates are preferable, and aluminum flat plates, aluminum alloy flat plates, magnesium flat plates, and magnesium alloy flat plates, which are particularly excellent in weight reduction, are preferable, and aluminum flat plates are further preferable. A flat plate and a flat plate made of an aluminum alloy are preferable.

The metal flat plate has excellent bondability and adhesion when it is combined with a polyphenylene sulfide resin composition member to form a lid material for electromagnetic wave shielding, and in particular, it becomes a lid material for electromagnetic wave shielding which is excellent in cold heat resistance. It is a flat plate treated by a physical treatment and / or a chemical treatment method, and the physical treatment method and / or a chemical treatment method may be a method of physically treating and / or chemically treating the surface of a metal flat plate. Any method can be used for physical treatment and / or chemical treatment, and the physical treatment includes, for example, a method of contacting or colliding fine solid particles on the surface, or irradiating a high-energy electromagnetic ray. Methods and the like can be mentioned, and more specifically, sandblasting treatment, liquid honing treatment, laser processing and the like can be mentioned. Further, examples of the abrasive during the sandblasting treatment and the liquid honing treatment include sand, steel grid, steel shot, cut wire, alumina, silicon carbide, metal slag, glass beads, plastic beads and the like. Further, as the laser processing, the methods proposed in WO2007 / 072603 and Japanese Patent Application Laid-Open No. 2015-142960 can also be mentioned. Moreover, as the chemical treatment, for example, anodizing treatment method, a method of chemical treatment with an aqueous solution of an acid or an alkali, and the like can be mentioned. The anodizing treatment may be, for example, a method of performing an electrification reaction in an electrolytic solution using a metal flat plate as an anode to form an oxide film on the surface thereof, and is generally used as an anodizing method in the field of plating and the like. Known methods can be used. More specifically, for example, 1) a DC electrolysis method in which electrolysis is performed by applying a constant DC voltage, 2) a bipolar electrolysis method in which electrolysis is performed by applying a voltage in which an AC component is superimposed on a DC component, and the like can be mentioned. .. As a specific example of the anodizing method, the method proposed in WO2004 / 055248 and the like can be mentioned. Further, as a method of chemically treating with an aqueous solution of acid or alkali, for example, a method of immersing a metal flat plate in an aqueous solution of acid or alkali to chemically treat the surface of the metal flat plate may be used. Examples of the alkaline aqueous solution include phosphoric acid-based compounds such as phosphoric acid; chromium acid-based compounds such as chromium acid; hydrofluoric acid-based compounds such as hydrofluoric acid; nitrate-based compounds such as nitrate; hydrochloric acid-based compounds such as hydrochloric acid. Compounds; sulfuric acid compounds such as sulfuric acid; alkaline aqueous solutions such as sodium hydroxide and ammonia aqueous solution; methods of chemical treatment with triazine thiol aqueous solution, triazine thiol derivative aqueous solution and the like can be mentioned. 10-096088, 10-056263, 04-032585, 04-032583, 02-298284, WO2009 / 151099, WO2011 / 104944, etc. The method of proposal, etc. can be mentioned.

Further, since the lid material has particularly excellent bondability and adhesion between the metal flat plate and the polyphenylene sulfide resin composition member, the physical treatment and / or the chemical treatment can be performed alone or both. It may be treated in combination, and for example, it may be a lid material for electromagnetic wave shielding by using a metal flat plate that has been physically treated on the surface and then chemically treated.

The lid material for electromagnetic wave shielding of the present invention is a polyphenylene sulfide resin composition in which the metal flat plate is arranged on the side surface and the lower bottom surface forming a prism shape, and the side portion of the metal flat plate has a volume specific resistance of 10 Ω · cm or less. By integrally joining the members, a prismatic shape with an open upper and lower bottom surface as a lid material for electromagnetic wave shielding is provided.

The polyphenylene sulfide (hereinafter sometimes abbreviated as PPS) constituting the polyphenylene sulfide resin composition member having a volume specific resistance of 10 Ω · cm or less at that time may belong to the category generally called polyphenylene sulfide. Of these, poly (p-phenylene sulfide) and amino group-substituted poly (p-phenylene sulfide) are preferable because they are members of a polyphenylene sulfide resin composition having particularly excellent heat resistance and strength characteristics. The PPS resin composition member can easily and efficiently have a volume specific resistance of 10 Ω · cm or less, and can provide a lid material for electromagnetic wave shielding having excellent rigidity. Therefore, carbon fibers can be provided. It is preferable that the PPS resin composition member comprises. As the carbon fiber, any of polyacrylonitrile-based, pitch-based, rayon-based, polyvinyl alcohol-based and the like can be used. Further, since the PPS resin composition member can provide a lid material for electromagnetic wave shielding having particularly excellent cold heat resistance, ethylene-α, β-unsaturated carboxylic acid alkyl ester-maleic anhydride copolymer weight. Combined, ethylene-α, β-unsaturated carboxylic acid glycidyl ester copolymer, ethylene-α, β-unsaturated carboxylic acid glycidyl ester-vinyl acetate copolymer, ethylene-α, β-unsaturated carboxylic acid glycidyl ester- A PPS resin composition member containing at least one modified ethylene polymer selected from the group consisting of α, β-unsaturated carboxylic acid alkyl ester copolymers and maleic anhydride graft-modified ethylene-based polymers. Is preferable.

The production method for producing the PPS resin composition constituting the PPS resin composition member is not particularly limited, and a method known as a general mixing / kneading method can be used, for example, all. Method of blending the raw materials of the above and melt-kneading; a method of blending a part of the raw materials and then melt-kneading, and then blending the remaining raw materials and melt-kneading; Any method may be used, such as a method of mixing the remaining raw materials using a side feeder during melt-kneading by a machine. As a method for performing melt-kneading, a conventionally used heat-melt-kneading method can be used, and examples thereof include a heat-melt-kneading method using a single-screw or twin-screw extruder, a kneader, a mill, lavender, or the like. In particular, a melt-kneading method using a twin-screw extruder having excellent kneading ability is preferable. Further, the kneading temperature at this time is not particularly limited, and usually can be arbitrarily selected from 280 to 320 ° C.

The PPS resin composition member constituting the lid material for electromagnetic wave shielding of the present invention may be a member used in any shape, area, volume, and coating as long as the electromagnetic wave shielding property can be maintained. Among them, the electromagnetic wave shielding material is used. It is preferable that the PPS resin composition member is formed by joining and sealing the combined side portions and gaps of the metal flat plates constituting the lid material with the PPS resin composition member. For example, when using a metal flat plate on which each surface of a prism shape is produced and combining the flat plates to form a prism-shaped metal lid material, or a cross-shaped metal flat plate in which a rectangular parallelepiped with one side as an opening surface is developed. When the flat plate is bent to form a rectangular parallelepiped metal lid material, the side portions thereof are joined by the PPS resin composition member to form a lid material for electromagnetic wave shielding. When a gap is formed, it is sealed by the PPS resin composition member. The PPS resin composition member at that time is preferably a PPS resin composition member having a wall thickness of 2 mm or more because it is a lid material for electromagnetic wave shielding which is particularly excellent in electromagnetic wave shielding property, rigidity, and cold heat resistance.

As the method for producing the lid material for electromagnetic wave shielding of the present invention, any manufacturing method may be used as long as the lid material for electromagnetic wave shielding can be produced, for example, the surface is physically and / or chemically treated. A method of directly integrating the metal flat plate and the PPS resin composition member by injection molding can be used, and among them, the lid material for electromagnetic wave shielding can be manufactured particularly efficiently, so that the injection insert molding method can be used. It is preferable to integrate them with each other. Then, as the injection insert molding method, for example, a metal flat plate whose surface is physically and / or chemically treated is mounted in a mold in a square pillar shape in which the upper bottom portion is open, and the side portion of the square pillar shape is mounted. Is filled with a molten resin of a PPS resin composition having a volume specific resistance of 10 Ω · cm or less by injection insert molding to form a PPS resin composition member, and an electromagnetic wave in which the metal flat plate and the PPS resin composition member are directly integrated. A method of using the lid material for a shield can be mentioned. The melting temperature of the PPS resin composition at this time can be 280 to 340 ° C., and as a molding machine for insert molding, the insert injection molding is performed using an injection molding machine because it is particularly excellent in productivity. It is preferable to do so.

The lid material for electromagnetic wave shielding of the present invention is excellent in light weight, cold heat resistance, rigidity and productivity, and is therefore preferably used as a lid material / housing for electromagnetic wave shielding of transportation equipment such as automobiles, railroad vehicles, and aircraft. It can be more preferably used as a lid material / housing for electromagnetic wave shielding.

The present invention is for an electromagnetic wave shield in which a metal flat plate obtained by physically and / or chemically treating a metal surface and a polyphenylene sulfide resin composition member having a volume specific resistance of 10 Ω · cm or less are integrated with the metal flat plate. A lid material is provided, and the electromagnetic wave shield lid material is lightweight, has excellent cold and heat resistance, rigidity, and productivity. Therefore, the electromagnetic wave shield lid material / housing for transportation equipment such as automobiles, railroad vehicles, and aircraft. It is useful as a body.

Schematic diagram of the lid material for electromagnetic wave shielding shown in Example 1 (unit: mm) : Development view of the metal flat plate shown in Example 2 (unit: mm) : Schematic diagram of shape addition of a square pillar-shaped metal flat plate with an open upper bottom shown in Example 2 (unit: mm) : Schematic diagram of the lid material for electromagnetic wave shielding shown in Example 2 (unit: mm)

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

The polyphenylene sulfide (A), ethylene polymer (B), carbon fiber (C), and glass fiber (D) used in Examples and Comparative Examples are shown below.

<Polyphenylene sulfide resin (A)>
Poly (p-phenylene sulfide) (hereinafter referred to as PPS (A-1)): melt viscosity 350 poisons.
Poly (p-phenylene sulfide) (hereinafter referred to as PPS (A-2)): Melt viscosity 340 poisons.

<Ethylene copolymer (B)>
Ethylene-α, β-unsaturated carboxylic acid glycidyl ester-α, β-unsaturated carboxylic acid alkyl ester copolymer (B-1) (hereinafter referred to as ethylene-based copolymer (B-1)): Sumitomo Made by Kagaku Co., Ltd. (trade name) Bond First 7M.
Ethylene-α, β-unsaturated carboxylic acid alkyl ester-maleic anhydride copolymer (B-2) (hereinafter referred to as ethylene-based copolymer (B-2)): manufactured by Alchema Co., Ltd., (Commodity) Name) Bondine AX8390.

<Carbon fiber (C)>
Carbon fiber (C-1); chopped fiber manufactured by Toho Tenax Co., Ltd. (trade name) Vesfight HTA-C6-SRS.
Carbon fiber (C-2); Chopped fiber manufactured by Mitsubishi Rayon Co., Ltd., (trade name) Pyrofil TR066A.

<Glass fiber (D)>
Glass fiber (D-1); chopped strand manufactured by Nitto Boseki Co., Ltd. (trade name) CSG-3PA 830.

<Synthesis Example 1 (Synthesis of PPS (A-1))>
To 15 liters autoclave equipped with a stirrer, flaky sodium sulfide _{(Na 2 S · 2.9H 2 O} ) 1814g, granular caustic soda (100% NaOH: Wako Pure Chemical special grade) 8.7 g and N- methyl-2-pyrrolidone 3232 g was charged, the temperature was gradually raised to 200 ° C. while stirring under a nitrogen stream, and 339 g of water was distilled off. After cooling to 190 ° C., 2129 g of p-dichlorobenzene and 1783 g of N-methyl-2-pyrrolidone were added, and the system was sealed under a nitrogen stream. This system was heated to 225 ° C. over 2 hours and polymerized at 225 ° C. for 1 hour, then heated to 250 ° C. over 25 minutes and polymerized at 250 ° C. for 2 hours. Next, 509 g of distilled water was press-fitted into this system at 250 ° C., the temperature was raised to 255 ° C., and a polymerization reaction was further carried out for 2 hours. After completion of the polymerization, the mixture was cooled to room temperature and the polymerization slurry was separated into solid and liquid by a centrifugal filter. The cake was washed repeatedly with N-methyl-2-pyrrolidone and acetone under a nitrogen stream three times in sequence, and further washed sequentially with 0.2% hydrochloric acid and warm water under a nitrogen stream. The obtained poly (p-phenylene sulfide) was dried at 105 ° C. for 24 hours to obtain PPS (A-1) having a melt viscosity of 350 poise.

<Synthesis Example 2 (Synthesis of PPS (A-2))>
To 15 liters autoclave equipped with a stirrer was charged with flaky sodium sulfide _{(Na 2 S · 2.9H 2 O} ) 1854g, 30% sodium hydroxide solution (30% NaOHaq) 48g and N- methyl-2-pyrrolidone 3679G, nitrogen flow The temperature was gradually raised to 200 ° C. with stirring, and 380 g of water was distilled off. After cooling to 190 ° C., 2140 g of p-dichlorobenzene and 985 g of N-methyl-2-pyrrolidone were added, and the system was sealed under a nitrogen stream. This system was heated to 225 ° C. over 2 hours and polymerized at 225 ° C. for 1 hour, then heated to 250 ° C. over 25 minutes, and further polymerized at 250 ° C. for 3 hours. After the polymerization, N-methyl-2-pyrrolidone was recovered from the polymerized slurry under reduced pressure by a distillation operation. The final temperature reached was 170 ° C. and the pressure was 4.7 kPa. The obtained cake was washed with warm water at 80 ° C. to a slurry concentration of 20%, and again warm water was added in the same manner to raise the temperature to 175 ° C., and poly (p-phenylene sulfide) was washed twice in total. The obtained polyphenylene sulfide was dried at 105 ° C. for 24 hours. Next, the dried polyphenylene sulfide was filled in a batch type rotary kiln type firing device, heated to 240 ° C. in a nitrogen atmosphere, and cured by holding for 0.5 hours. A-2) was obtained.

The evaluation / measurement method of the obtained polyphenylene sulfide resin composition and the lid material for electromagnetic wave shielding is shown below.

~ Measurement of melt viscosity of polyphenylene sulfide resin ~
Measurement of melt viscosity under conditions of measurement temperature 315 ° C and load 10 kg with a high-grade flow tester (manufactured by Shimadzu Corporation, (trade name) CFT-500) equipped with a die with a diameter of 1 mm and a length of 2 mm. Was done.

~ Measurement of volume specific resistance of polyphenylene sulfide resin composition ~
The polyphenylene sulfide resin composition was injection-molded by an injection molding machine (manufactured by Sumitomo Heavy Industries, Ltd., (trade name) SE-75S) at a cylinder temperature of 310 ° C. and a mold temperature of 135 ° C., 127 mm × 12.7 mm. A molded product having a thickness of × 3.2 mm was used, and the volume specific resistance was measured using a digital multimeter (manufactured by Advantest Co., Ltd., (trade name) TR-6855).

~ Evaluation of electromagnetic wave shielding property ~
An antenna oscillating at a frequency of 1 GHz was placed in the obtained lid material for electromagnetic wave shielding, the opening surface was covered with an aluminum plate having a thickness of 10 mm and a sheet having electromagnetic wave shielding performance without gaps, and the measurement distance was 3 m according to ARIB TR-G1. An electromagnetic wave shielding property at 1 GHz was evaluated with a spectrum analyzer (manufactured by Advantest Co., Ltd. (trade name) R-3361A) using a horn antenna as a receiving antenna for measurement at a height of 1.5 m above the ground. It was judged that the electromagnetic wave shielding property having a shielding performance of 30 decibels or more shows a practically sufficient value.

~ Evaluation of cold heat resistance ~
The obtained lid material for electromagnetic wave shielding was held at 150 ° C. for 30 minutes and then subjected to a cooling / heating cycle in which holding at −40 ° C. for 30 minutes was used as one cycle, and 250 cycles were tested. After the test, the presence or absence of peeling between the metal flat plate portion and the polyphenylene sulfide resin composition member was visually observed. Those that did not show peeling were regarded as acceptable products.

Example 1
A plate made of aluminum alloy (A7075) is processed, and one flat plate made of aluminum alloy (A7075) having a regular hexagonal shape with a side of 100 mm and a thickness of 1 mm and six flat plates made of 100 mm × 50 mm × 1 mm thick are formed. Made. After cleaning the surface by immersing the aluminum alloy (A7075) flat plate in acetone, a hatching width of 0.09 mm, a frequency of 9 KHz, and a speed of 80 mm / sec 1000 times in the orthogonal direction using a laser having a wavelength of 1.064 μm. By performing scanning laser treatment, an aluminum alloy (A7075) flat plate having a physically treated aluminum alloy surface was obtained.

A twin-screw extruder in which 10 parts by weight of an ethylene-based copolymer (B-1) was uniformly mixed with 100 parts by weight of PPS (A-1) obtained in Synthesis Example 1 and heated to a cylinder temperature of 300 ° C. It was put into a hopper (manufactured by Toshiba Machine Co., Ltd., (trade name) TEM-35-102B). On the other hand, carbon fiber (C-1) was charged from the hopper of the side feeder of the twin-screw extruder so as to be 50 parts by weight with respect to 100 parts by weight of PPS (A-1), and melt-kneaded to pelletize. A poly (p-phenylene sulfide) resin composition was prepared. The volume specific resistance of the obtained PPS resin composition was 5 Ω · cm.

The obtained aluminum alloy (A7075) flat plate was set in a mold so that the upper bottom portion had an opening surface in the shape of a regular hexagonal pillar, and the cylinder temperature was 310 ° C. and the mold temperature was 140 ° C. The PPS resin composition was injection-molded on each side of the aluminum alloy flat plate with a wall thickness of 5 mm using an injection molding machine (manufactured by Sumitomo Heavy Industries, Ltd. (trade name) SE100S) set in FIG. The lid material for electromagnetic wave shielding shown was prepared, and the electromagnetic wave shielding performance and cold heat resistance were evaluated.

The electromagnetic wave shielding performance was 31 decibels, and no peeling was observed in the evaluation of cold heat resistance.

Example 2
An aluminum alloy (A5052) flat plate was processed to prepare a cross-shaped aluminum alloy (A5052) flat plate having a bottom surface of 150 mm × 150 mm, a side surface of 150 mm × 50 mm, and a wall thickness of 1 mm, as shown in FIG. After cleaning the surface by immersing the aluminum alloy (A5052) flat plate in acetone, the aluminum alloy flat plate is immersed in a 1 wt% aqueous sodium hydroxide solution and then a 10 wt% sulfuric acid aqueous solution, and further. An aluminum alloy (A5052) flat plate was obtained by chemically treating the surface of the aluminum alloy by anodization treatment in a 15 wt% aqueous sulfuric acid solution at a current density of 0.5 A / cm ^3.

Biaxial extrusion in which 15 parts by weight of an ethylene-based copolymer (B-2) was uniformly mixed with 100 parts by weight of PPS (A-2) obtained in Synthesis Example 2 and heated to a cylinder temperature of 300 ° C. It was put into the hopper of the machine (manufactured by Toshiba Machine Co., Ltd. (trade name) TEM-35-102B). On the other hand, carbon fiber (C-2) was charged from the hopper of the side feeder of the twin-screw extruder so as to be 75 parts by weight with respect to 100 parts by weight of PPS (A-2), and melt-kneaded to pelletize. A poly (p-phenylene sulfide) resin composition was prepared. The volume specific resistance of the obtained PPS resin composition was 1 Ω · cm.

The obtained flat plate made of aluminum alloy (A5052) is bent, and a rectangular aluminum alloy member shown in FIG. 3 having an upper bottom surface as an opening surface is set in a mold, and the cylinder temperature is 310 ° C. and the mold temperature. Using an injection molding machine (manufactured by Sumitomo Heavy Industries, Ltd. (trade name) SE100S) set at 140 ° C., the PPS resin composition was injection-molded on each side of the aluminum alloy plate with a wall thickness of 2 mm, and FIG. The lid material for electromagnetic wave shielding shown in the above was prepared, and the electromagnetic wave shielding performance and cold heat resistance were evaluated.

The electromagnetic wave shielding performance was 40 decibels, and no peeling was observed in the evaluation of cold heat resistance.

Comparative Example 1
An aluminum alloy member and a lid material were obtained by the same method as in Example 1 except that the surface of the aluminum alloy flat plate was not roughened and was made into an untreated aluminum alloy flat plate, and the electromagnetic wave shielding performance and cold heat resistance were evaluated. Was done.

Although the electromagnetic wave shielding performance showed 30 decibels, peeling was observed in the evaluation of cold heat resistance.

Comparative Example 2
A PPS resin composition and a lid material were obtained by the same method as in Example 1 except that the carbon fiber (C-1) of Example 1 was made of glass fiber (D-1), and the electromagnetic wave shielding performance and cold heat resistance were evaluated. Was done. The volume specific resistance of the obtained PPS resin composition was 10 ¹⁴ Ω · cm.

Although no separation was observed in the evaluation of cold and heat resistance, the electromagnetic wave shielding performance was 3 dB, which was inferior to the electromagnetic wave shielding performance.

The present invention is an electromagnetic wave shielding lid in which a metal flat plate obtained by physically and / or chemically treating a metal surface and a polyphenylene sulfide resin composition member having a volume specific resistance of 10 Ω · cm or less are integrated with the metal flat plate. The material is provided, and the electromagnetic wave shielding lid material is lightweight, has excellent cold and heat resistance, rigidity, and productivity. Therefore, the electromagnetic wave shielding lid material for module parts of transportation equipment such as automobiles, railroad vehicles, and aircraft. -What is expected of the housing.

1; Aluminum alloy flat plate 2; Polyphenylene sulfide resin composition member

Claims (5)

An electromagnetic wave shielding lid material having a prismatic shape with an open upper and lower surface, and the side surface and lower bottom surface forming the prismatic shape are a group consisting of sandblasting, liquid honing, laser processing, and anodization. A polyphenylene sulfide resin composition containing carbon fibers, which is a metal flat plate that has been subjected to a treatment of more selection , and has a volume specific resistance of 1 to 5 Ω · cm at the side portion that is an integrated joint portion of the metal flat plate portion. A lid material for electromagnetic wave shielding, which is characterized by being a member. The lid material for electromagnetic wave shielding according to claim 1, wherein the polyphenylene sulfide resin composition member is a polyphenylene sulfide resin composition member having a wall thickness of 2 mm or more. The lid material for electromagnetic wave shielding according to claim 1 or 2, wherein the prism shape is a square prism or a hexagonal prism. The electromagnetic wave shield according to any one of claims 1 to 3, wherein the polyphenylene sulfide resin composition member is at least a polyphenylene sulfide resin composition member containing a polyphenylene sulfide resin, a carbon fiber, and an ethylene-based copolymer. Lid material. A metal flat plate whose surface has been subjected to a treatment selected from the group consisting of sandblasting treatment, liquid honing treatment, laser processing treatment and anodization treatment is mounted in a mold in the shape of a square pillar having an open upper and lower bottom surface, and the square pillar is mounted. The volume specific resistance is 1 to 5 Ω · cm on the side of the shape, and the molten resin of the polyphenylene sulfide resin composition containing carbon fibers is injection-insert molded to integrate the metal flat plate and the polyphenylene sulfide resin composition member. The method for manufacturing an electromagnetic wave shielding lid material according to claims 1 to 4, wherein the upper and lower surfaces have an open square column shape.

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