WO1988004986A1 - Procede de moulage de compositions de resine contenant des fibres metalliques - Google Patents

Procede de moulage de compositions de resine contenant des fibres metalliques Download PDF

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Publication number
WO1988004986A1
WO1988004986A1 PCT/JP1987/001023 JP8701023W WO8804986A1 WO 1988004986 A1 WO1988004986 A1 WO 1988004986A1 JP 8701023 W JP8701023 W JP 8701023W WO 8804986 A1 WO8804986 A1 WO 8804986A1
Authority
WO
WIPO (PCT)
Prior art keywords
resin
resin composition
styrene
mold
injection
Prior art date
Application number
PCT/JP1987/001023
Other languages
English (en)
Japanese (ja)
Inventor
Hiroshi Tamaki
Toshio Herai
Yukio Suzuki
Original Assignee
Nippon Steel Corporation
Nippon Steel Chemical Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corporation, Nippon Steel Chemical Co., Ltd. filed Critical Nippon Steel Corporation
Priority to KR1019880701035A priority Critical patent/KR920004737B1/ko
Publication of WO1988004986A1 publication Critical patent/WO1988004986A1/fr

Links

Classifications

    • 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
    • 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
    • B29C45/0013—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fillers dispersed in the moulding material, e.g. metal particles
    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating

Definitions

  • the present invention relates to a method for molding a styrene-based thermoplastic resin composition containing metal fibers useful for producing, for example, a casing of an electronic device having electromagnetic wave shielding performance, and particularly to a styrene resin containing metal fibers.
  • An object of the present invention is to provide a molding method capable of obtaining a molded product having excellent surface quality by injection molding of a thermoplastic resin composition.
  • Electronic ⁇ Styrene-based thermoplastic resin compositions are often used for the housing of electrical equipment due to various advantages such as appearance, design, light weight, productivity, and low cost. Because of its transparency, many proposals have been made for imparting electrical conductivity to it from the viewpoint of preventing electromagnetic interference. Among them, a resin composition containing a conductive material in a resin is disclosed in, for example, JP-A-58-150,203 (U.S. Pat. No. 4,664,971); Various proposals have been made as shown in, for example, Japanese Patent Application Laid-Open Nos. 215, 313 and the like.Resin compositions containing these metal fibers have been proposed mainly for obtaining molded articles by injection molding.
  • the resulting molded article has defects such as silver stripes and fibers flying out caused by metal fibers in the resin composition, and the appearance of the molded article surface At present, however, it is so damaged that it cannot be put to practical use as it is.
  • none of the above prior arts suggests any means for improving these problems.
  • the molten resin is charged into the mold quickly without causing a decrease in the temperature of the molten resin, and is uniformly cooled.
  • the present inventors have conducted intensive studies on injection molding conditions in order to reduce surface defects of injection molded articles of the styrene-based thermoplastic resin composition containing these metal fibers. It has been found that the mold temperature and the injection speed (that is, the filling time required for filling the resin composition in the mold) have a close relationship with the surface of the molded article.
  • an object of the present invention is to set injection molding conditions for injection molding a styrene-based thermoplastic resin composition containing metal fibers, thereby obtaining an injection-molded article having excellent surface quality.
  • An object of the present invention is to provide a method for molding a resin composition which can be performed.
  • the constant 8. O x 1 0_ 3 and the constant I 00 in. Any of which are constants determined by the physical properties of the resin to be subjected to injection molding, Ma Bok click scan the styrenic thermoplastic resin composition This is a value in the case of a thermoplastic composite resin composition containing the metal fibers used as the material.
  • the content of the metal fiber in the thermoplastic resin composition As the content of the metal fiber increases, the fluidity of the resin deteriorates, and high-speed filling becomes difficult. Contains the mature properties of matrix resin and metal fibers Since the mature physical properties of the thermoplastic resin compositions differ greatly, the content of metal fibers is preferably 5% by volume or less.
  • the resin temperature indicates the temperature immediately before flowing into the mold. However, if there is no significant difference from the cylinder temperature of the injection molding machine, it can be regarded as the cylinder temperature for practical use.
  • the filling time is a time required for the resin composition to be filled in the mold, and does not include a process time such as pressure holding.
  • the mature resin composition used in the method of the present invention contains a metal fiber, but the reason specified in this way is that, when compared as an electromagnetic wave shielding material, a material containing a metal in the form of a steel wire has another property. Compared to those containing conductive materials having properties and morphology, they exhibit excellent effects with a small amount of addition, and moreover, the silver strips and fibres found on the surface of molded articles when molded by injection molding. This is because surface defects such as protrusions are characteristic of the resin composition containing such metal fibers.o
  • the styrene-based resin which is a non-crystalline thermoplastic resin serving as a matrix, is a polymer of an aromatic monovinyl compound, a copolymer containing the same, or a mixture containing one or more of these. In the case of a copolymer or a mixture, it contains at least 20% by weight, preferably at least 60% by weight of an aromatic monovinyl compound.
  • aromatic monovinyl compounds include styrene, paramethylstyrene, paramethylstyrene, parachlorostyrene, and the like, and copolymers or mixtures thereof include AS resins, HI resins, and styrene-methacrylate copolymers. Resin, ABS resin, MBS resin, styrene-maleic anhydride copolymer resin, polycarbonate-polystyrene mixture, PMMA-ABS mixture, etc.
  • additives such as a stabilizer, a plasticizer, a flame retardant, a release agent, a dye, and a pigment may be added to the resin composition.
  • an austenitic stainless steel fiber for the metal fibers contained in these matrix resins, taking into account the electromagnetic wave shielding effect, weather resistance and other characteristics in general.
  • Any of light- or martensitic stainless steel fibers and fibers made of metals such as iron, copper, aluminum, nickel, and machinyu, or alloys thereof may be used.
  • the shape and amount of the metal fiber is, for example, a diameter of 2 to 50 m and a fiber length of about 3 to 20 m before injection molding. Suitable for The addition amount is adjusted according to the required electromagnetic shielding performance, but is generally 5% by volume or less, preferably about 0.5 to 3% by volume.
  • the method for preparing the resin composition by mixing the metal fiber and the non-crystalline styrene-based thermoplastic resin is not specified in the present invention, but is generally performed by a conventionally known method. Either may be used.
  • a metal fiber bundle may be bundled by a solvent method or the like using an appropriate resin, cut into a predetermined length, and then dry-blended with a natural pellet, or the blended composition may be extruded. It may be melt-kneaded using a device such as a kneading machine or a kneading roll to form pellets.
  • any injection molding machine can be used as long as the mold temperature and the filling time set in the present invention can be realized. It is desirable to use a molding machine that is as fast as possible (high injection rate) because it is desirable to make the molding as short as possible. Since the problem here is the filling time, the required injection rate changes depending on the size of the product to be formed. And a so-called high-speed injection molding machine equipped with a high-capacity injection mechanism in advance. At this time, it is advantageous to stabilize the molding by providing a sensor in the cylinder or the mold to monitor the molding condition, or by performing injection control by presetting or feedback, for example, by using an in-mold pressure.
  • AS resin AS resin
  • GP polystyrene
  • PA polyamide
  • PBT polyethylene terephthalate
  • PC polycarbonate
  • PPO modified polyphenylene oxide
  • a styrene-based thermoplastic electromagnetic wave shield is used in the same manner as described above. Materials were prepared.
  • thermoplastic electromagnetic wave shielding materials prepared in this way, using the following five types of high-speed injection molding machines or general-purpose injection molding machines, the various types of molding shown in Table 1 Molded under the conditions.
  • Model A I S100 made by Toshiba Machine Line
  • Model B Made by Mitsubishi Heavy Industries Line ⁇ 25 X 75 M ST
  • Model C 900 X 200 MST manufactured by Mitsubishi Heavy Industries, Ltd.
  • Model E Sumitomo Nestal Corporation N 51 5/50 Mold clamp 50 ton
  • a molded article molded in accordance with the conditions of the present invention has sufficient electromagnetic wave shielding properties, has an excellent molded article surface, and can be put to practical use as it is. It was also found that it was possible to obtain a more beautiful appearance with simple painting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

Procédé de moulage à injection d'une composition de résine styrénique contenant des fibres métalliques, dans des conditions de moulage telles que t 8,0 x 10-3 x { (Tr - Tm)/(100 - Tm) }2, où Tm (°C) représente la température du moule, Tr (°C) représente la température de la résine fondue et t (s) représente le temps nécessaire pour remplir un moule avec la composition de résine. Ce procédé permet de réaliser des moulages présentant une surface d'excellente qualité et de produire des boîtiers, par exemple d'appareils électroniques et électriques possédant des propriétés de blindage contre les ondes électromagnétiques.
PCT/JP1987/001023 1986-12-24 1987-12-24 Procede de moulage de compositions de resine contenant des fibres metalliques WO1988004986A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019880701035A KR920004737B1 (ko) 1986-12-24 1987-12-24 금속섬유를 함유하는 수지 조성물의 성형방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP61313638A JPS63160814A (ja) 1986-12-24 1986-12-24 金属繊維を含有する樹脂の成形方法
JP61/313638 1986-12-24

Publications (1)

Publication Number Publication Date
WO1988004986A1 true WO1988004986A1 (fr) 1988-07-14

Family

ID=18043726

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1987/001023 WO1988004986A1 (fr) 1986-12-24 1987-12-24 Procede de moulage de compositions de resine contenant des fibres metalliques

Country Status (4)

Country Link
JP (1) JPS63160814A (fr)
KR (1) KR920004737B1 (fr)
GB (1) GB2218937B (fr)
WO (1) WO1988004986A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1060998C (zh) * 1994-09-28 2001-01-24 松下电器产业株式会社 中空结构件的制造方法及中空结构件
JPH0948062A (ja) * 1995-04-10 1997-02-18 Matsushita Electric Ind Co Ltd 成形方法と成形装置と成形品

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58134721A (ja) * 1982-02-04 1983-08-11 Aron Kasei Co Ltd 導電性フイラ−を混入してなる熱可塑性樹脂成形品
JPS58150203A (ja) * 1981-12-30 1983-09-06 エヌ・ヴイ・ベカルト・エス・エイ 導電性ファイバ含有プラスチック成形用柱状部材
JPS59124824A (ja) * 1983-01-05 1984-07-19 Toshiba Chem Corp 電磁波遮蔽性合成樹脂射出成形品の製造方法
JPS61261013A (ja) * 1985-05-15 1986-11-19 Hitachi Ltd 電子機器用電磁シ−ルドキヤビネツトの製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58150203A (ja) * 1981-12-30 1983-09-06 エヌ・ヴイ・ベカルト・エス・エイ 導電性ファイバ含有プラスチック成形用柱状部材
JPS58134721A (ja) * 1982-02-04 1983-08-11 Aron Kasei Co Ltd 導電性フイラ−を混入してなる熱可塑性樹脂成形品
JPS59124824A (ja) * 1983-01-05 1984-07-19 Toshiba Chem Corp 電磁波遮蔽性合成樹脂射出成形品の製造方法
JPS61261013A (ja) * 1985-05-15 1986-11-19 Hitachi Ltd 電子機器用電磁シ−ルドキヤビネツトの製造方法

Also Published As

Publication number Publication date
KR920004737B1 (ko) 1992-06-15
JPH0333496B2 (fr) 1991-05-17
GB2218937A (en) 1989-11-29
JPS63160814A (ja) 1988-07-04
GB2218937B (en) 1990-11-28
KR890700069A (ko) 1989-03-02

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