WO1988004986A1 - Process for molding resin composition containing metallic fibers - Google Patents
Process for molding resin composition containing metallic fibers Download PDFInfo
- 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
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- WIPO (PCT)
- Prior art keywords
- resin
- resin composition
- styrene
- mold
- injection
- Prior art date
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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
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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
- B29C45/0013—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
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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
- B29C45/17—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.
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- 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
A process for injection molding a styrenic resin composition containing metallic fibers under the molding condition of: t 8.0 x 10-3 x { (Tr - Tm)/(100 - Tm) }2 (wherein Tm (°C) represents a mold temperature, Tr (°C) represents a molten resin temperature, and t (sec) represents a time taken for filling a mold with the resin composition). This process provides moldings having excellent surface quality and enables manufacture of housings, etc. of electronic and electric appliances having electromagnetic wave shielding properties.
Description
明 細 書 Specification
金属繊維を含有する樹脂組成物の成形方法 Molding method of resin composition containing metal fiber
技 術 分 野 Technical field
この発明は、 例えば電磁波シールド性能を有する電子 ♦ 電気機器の筐体等を製造するのに有用な金属繊維を含 有するスチレン系熱可塑性樹脂組成物の成形方法に係り、 特に金属繊維を含有するスチレン系熱可塑性樹脂組成物 の射出成形により、 表面品質の優れた成形品を得ること ができる成形方法を提供するものである。 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.
背 景 技 術 Background technology
電子 ♦ 電気機器の筐体には、 外観、 デザイン、 軽量、 生産性、 低価格等々の種々の利点からスチレン系熱可塑 性樹脂組成物が多く用いられているが、 この樹脂組成物 は電磁気的に透明であるため、 電磁波障害防止の観点か 、 らこれに導電性を付与するための提案が多数なされてい る。 なかでも樹脂中に導電性材料を含有させた樹脂組成 物については、 例えば特開昭 58- 1 50 , 203号公報 （米国特 許第 4 , 664 , 971号明細書〉 、 特開昭 58- 21 5 , 31 3号公報等 にみられるように種々提案されている。 そして、 これら 金属繊維を含有する樹脂組成物は、 主として射出成形に よって成形品を得るためのものとして提案されているが、 実際に射出成形を行なってみると、 得られた成形品は樹 脂組成物中の金属繊維によって生ずる銀条ゃ繊維の飛出 し等の欠陥がその表面で発生し、 成形品表面の外観が著 しく損なわれてそのままでは実用に供し得ないのが現状 である。
しかしながら、 上記各先行技術では、 これらの問題を 改善するための手段については何ら提案されていない。 また、 一般的に射出成形法において、 良好な表面を有す る成形品を得るためには溶融樹脂の温度の低下を生じさ せずに早く金型内に充塡させ、 一様に冷去 pさせることと、 型内圧波形が重要であるといわれているが、 これらの手 段のみでは金属繊維を含有するスチレン系熱可塑性樹脂 組成物の場合は良好な表面を有する成形品を得ることが 困難である。 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. However, when injection molding is actually performed, 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. However, none of the above prior arts suggests any means for improving these problems. In addition, in general, in order to obtain a molded product having a good surface in the injection molding method, the molten resin is charged into the mold quickly without causing a decrease in the temperature of the molten resin, and is uniformly cooled. It is said that the pressure is important and the mold pressure waveform is important.However, with these methods alone, a molded article having a good surface can be obtained in the case of a styrene-based thermoplastic resin composition containing metal fibers. Have difficulty.
そこで、 本発明者等は、 これら金属繊維を含有したス チレン系熱可塑性樹脂組成物の射出成型品の表面欠陥を 低減するために、 射出成形条件について鋭意研究を重ね た結果、 樹脂温度と金型温度及び射出速度 （すなわち、 金型内に樹脂組成物が充填されるに要する充填時間〉 が 成形品表面と密接な関係を有することを見出した。 Accordingly, 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.
すなわち、 一般的に射出成型法においては射出速度が 速い方が良いといわれているが、 金属纖維を含有するス チレン系熟可塑性樹脂組成物の場合には、 金型温度が低 いといくら射出速度を早くしても、 成形品の表面欠陥は 無くならない。 しかしながら、 本発明者等の研究により、 金型温度を通常用いられている温度より高めに設定する ことにより、 良好な表面を有する成形品が得られること が判明した。 同時に樹脂温度も重要であって、 樹脂温度 が通常の成形範囲を超えない範囲においても、 樹脂温度 と金型温度の温度差が大きければ同じ充瑱時間でも良好 な表面を有する成形品が得られることが判明した。 そし
て、 これらの結果から、 本発明者等は特定の樹脂温度、 金型温度及び充塡時間を成形条件として選択することに より、 良好な表面を有する成形品が得られることを見出 した。 In other words, it is generally said that a higher injection speed is better in the injection molding method. However, in the case of a styrene-based thermoplastic resin composition containing a metal fiber, if the mold temperature is low, the injection speed is much higher. Even if this is accelerated, the surface defects of the molded product will not be eliminated. However, research by the present inventors has revealed that a molded article having a good surface can be obtained by setting the mold temperature higher than a temperature usually used. At the same time, the resin temperature is also important, and even if the resin temperature does not exceed the normal molding range, if the temperature difference between the resin temperature and the mold temperature is large, a molded product with a good surface can be obtained even with the same filling time. It has been found. Soshi From these results, the present inventors have found that a molded product having a good surface can be obtained by selecting specific resin temperature, mold temperature and filling time as molding conditions.
従って、 本発明の目的は、 金属繊維を含有するスチレ ン系熟可塑性樹脂組成物を射出成形する際の射出成形条 件を設定し、 これによつて優れた表面品質の射出成形品 を得ることができる樹脂組成物の成形方法を提供するこ とにある。 Accordingly, 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.
発 明 の 開 示 Disclosure of the invention
すなわち、 本発明は、 金属繊維を含有するスチレン系 樹脂組成物を射出成形するに際して、 金型温度を Tm (で） とし、 溶融樹脂温度を Tr (で〉 としたとき、 金型内への 樹脂組成物の充塡時間 t ( sec. ) が、 ' That is, in the present invention, when injection molding a styrene-based resin composition containing metal fibers, when the mold temperature is Tm (in) and the molten resin temperature is Tr (in), the resin in the mold is The filling time t (sec.) Of the composition is
ΐ≤ 8. 0 x 1 0 "3x {(Tr- Tm)/(100- Tfn)-}2 となる条件で射出成形する金属繊維を含有する樹脂組成 物の成形方法である。 This is a method for molding a resin composition containing metal fibers, which is to be injection-molded under the condition of ΐ≤8.0 × 10 ″ 3 × {(Tr−Tm) / (100−Tfn) −} 2 .
ここで、 定数 8. O x 1 0_3及び定数 Ί 00は.、 その いずれも射出成形に供する樹脂の物性等により定まる定 数であり、 スチレン系熱可塑性樹脂組成物をマ 卜 リ ック スとして用いた金属繊維を含有する熱可塑性複合樹脂組 成物の場合の値である。 Here, 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.
本発明方法において、 熱可塑性樹脂組成物中の金属繊 維の含有量については、 この金属繊維の含有量が多くな ると、 樹脂の流動性が悪化して高速充塡が困難になり、 また、 マ 卜リ ックス樹脂の熟的物性と金属繊維を含有す
る熱可塑性樹脂組成物の熟的物性が大きぐ異なるため、 金属鐡維の含有量としては 5容量％以下が望ましい。 In the method of the present invention, as for 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.
樹脂温度は、 本発明方法では金型内に流入する直前の 温度を示すが、 射出成形機のシリンダー温度と大差が無 ければ、 実用上そのシリンダー温度とみることができる。 また、 充塡時間は、 樹脂組成物が金型内に充篛するに必 要な時間であり、 保圧等の工程時間は含めない。 In the method of the present invention, 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.
本発明方法に使用する熟可塑性樹脂組成物は金属鐡維 を含有するものであるが、 このように特定した理由は、 電磁波シールド材料として比較したとき、 鐡維状の金属 を含むものが他の性状や形態を持つ導電性材料を含むも のに比べて、 少ない添加量で優れた効果を発揮し、 しか も、 射出成形により成形した場合に成形品の表面にみら れる銀条ゃ纖維の飛出レのような表面欠陥は、 このよう な金属繊維を含む樹脂組成物に特徴的なものであるから である o 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
ところで、 ポリオレフイン、 ポリアミ ド等のいわゆる 結晶性熱可塑性樹脂をマ 卜リ ックス樹脂とした樹脂組成 物の場合には、 通常実施されている射出成形条件であつ てもかなり品質の良い表面が得られるため、 射出成形条 件を上述したような条件に特定する必要はない。 しかし ながら、 ポリスチレン、 A B S (アクリ ロニトリル一ブ タジェン一スチレン樹脂〉 等のいわゆる非結晶性のスチ レン系熟可塑性樹脂をマ 卜リ ックス樹脂とする場合には、 射出成形条件を上述した条件に特定することによって表 面品質の良好な成形品を得ることができる。
マ 卜 リ ツクスとなる非結晶性の熱可塑性樹脂であるス チレン系樹脂は、 芳香族モノビニル化合物の重合体又は これを含む共重合体あるいはこれらの Ί 種又は 2種以上 を含む混合物であり、 共重合体又は混合物の場合には芳 香族モノ ビニル化合物を 2 0重量％以上、 好ましくは 6 〇重量％以上含むものである。 そして、 芳香族モノビ二 ル化合物としてはスチレン、 ひーメチルスチレン、 パラ メチルスチレン、 パラクロルスチレン等があり、 また、 共重合体あるいはその混合物としては A S樹脂、 H I 樹 脂、 スチレン一メタクリ レー 卜共重合樹脂、 A B S樹脂、 M B S樹脂、 スチレン一無水マレイン酸共重合樹脂、 ポ リカ一ボネー 卜一ポリスチレン混合物、 P M M A— A B S混合物等がある。 By the way, in the case of a resin composition using a so-called crystalline thermoplastic resin such as polyolefin or polyamide as a matrix resin, a considerably high quality surface can be obtained even under ordinary injection molding conditions. Therefore, it is not necessary to specify the injection molding conditions to those described above. However, when a so-called amorphous styrene-based thermoplastic resin such as polystyrene or ABS (acrylonitrile-butadiene-styrene resin) is used as the matrix resin, the injection molding conditions are specified as described above. By doing so, a molded article having good surface quality can be obtained. 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. Examples of 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.
また、 上記樹脂組成物中に安定剤、 可塑剤、 難燃剤、 離型剤、 染料、 顔料等の添加剤を加えることは差支えな い。 In addition, 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.
これらマ 卜リ ックス樹脂に含有させる金属繊維は、 電 磁波のシールド効果や耐候性その他の特性を総合的に勘 案すると、 オーステナィ 卜系ステンレス繊維を用いるこ とが最も望ましいが、 そのほかのフ Iライ 卜系あるいは マルテンサイ 卜系のステンレス繊維や、 鉄、 銅、 アルミ 二ゥ厶、 ニッケル、 真ちゆう等の金属あるいはその合金 からなる繊維のいずれであってもよい。 金属繊維の形状 や添加量についても特に制限するものではないが、 形状 については例えば直径が 2〜 5 0〃 mの範囲であって、 射出成形前の繊維長が 3〜 2 0删程度のものが適してお
り、 また、 添加量については、 必要とされる電磁波シー ルド性能に応じて調整されるが、 一般的には 5容量％以 下、 好ましくは 0 . 5〜 3容量％程度が適している。 It is most desirable to use 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. There is no particular limitation on the shape and amount of the metal fiber, but the shape 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.
金属繊維と非結晶性スチレン系の熟可塑性樹脂とを混 台して樹脂組成物を調製する方法については、 本発明で は特定するものではなく、 一般的に行われている従来公 知の方法のいずれでもよい。 例えば、 適当な樹脂を用い て溶剤法等により金属繊維束を集束し、 これを所定の長 さに切断した後、 ナチュラルペレツ 卜とドライブレンド したものでもよく、 あるいは、 そのブレンド組成物を押 出機、 混練ロール等の装置を用いて溶融混練しペレツ 卜 化したものでもよい。 さらには、 上記金属鐡維束を適当 な樹脂で被覆し、 これを切断して必要に応じてナチユラ ルペレツ 卜とドライプレンドした組成物、 あるいは、 そ の組成物を溶融混練して再度ぺレツ 卜としたものでもよ い。 これらの場合、 最初の集束あるいは被覆に用いる樹 脂と後から混合する樹脂どは必ずしも同種のものである 必要はない。 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. For example, 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. Furthermore, a composition obtained by coating the above-mentioned metal sliver with an appropriate resin, cutting the same, and dry blending with a natural pellet if necessary, or melting and kneading the composition and pelletizing again. It may be something that you did. In these cases, the resin used for initial sizing or coating and the resin to be mixed later need not necessarily be of the same type.
本発明方法を実施するにあたつて使用する射出成形機 としては、 本発明で設定する金型温度と充鎮時間を実現 できるものならばどのようなものを用いてもよいが、 充 塡時間をできるだけ短くすることが望ましいので、 でき るだけ高速 （高射出率） の成形機を用いるのが有利であ る。 ここで間題としているのは充填時間であるから、 成 形される製品の大きさによつて必要な射出率が変化する が、 一般的には通常の射出成形機にアキユミユレ一ター
を設置して増速したものや、 予め高能力の射出機構を備 えたいわゆる高速型射出成形機等を使用することができ る。 この際、 シリンダー内あるいは金型内にセンサ一を 設けて成形状況を監視し、 あるいはプリセッ 卜又はフィ ードバックにより、 例えば型内圧による射出制御を行う ことは成形の安定化のために有利である。 また、 金型に ついては他の弊害が出ない範囲で可能な限り温度を高く 設定することが必要であるが、 その他に金型内を減圧な いしは真空にするとか、 エアの抜け易い構造にする等の 工夫を施すことも安定した成形品の良好な表面品質を確 保する上で有効である。 As the injection molding machine used in carrying out the method of the present invention, 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. In addition, it is necessary to set the temperature of the mold as high as possible without causing other adverse effects.However, in addition, the inside of the mold must be depressurized or evacuated, or the air must be easily vented. It is also effective to take measures such as to ensure stable and good surface quality of molded products.
発明を実施するための最良の形態 以下、 実施例及び比較例に基いて、 本発明方法を具体 的に説明する。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the method of the present invention will be specifically described based on examples and comparative examples.
実施例 Ί〜 23及び比較例 Ί〜 24 Examples Ί to 23 and Comparative Examples Ί to 24
マ卜 リ ックス樹脂の主成分となるナチュラルペレツ 卜 として耐衝撃性ポリスチレン （ H I 、 新日鐵化学㈱製商 品名 ： H 65〉 又は A BS樹脂 （ A BS、 宇部興産㈱製 商品名 ： サイコラック L N 1101) を使用し、 また、 金属 繊維としてステンレス繊維束 （ S U S 304、 直径 Ί 5 m) に樹脂被覆を施こして長さ 6纖に切断したものを 使用し、 これらをドライブレンドして繊維含有量がつ 0 重量％ ( 1 . 5容量0 /0〉 となるように調整し、 スチレン 系熱可塑性電磁波シールド材とした。 As natural pellets, which are the main components of the matrix resin, high impact polystyrene (HI, Nippon Steel Chemical Co., Ltd. product name: H65) or ABS resin (ABS, Ube Industries, Ltd. product name: Psycholac) LN 1101), and a stainless steel fiber bundle (SUS 304, diameter Ί5 m) coated with resin and cut into a 6-fiber length as the metal fiber is used. content month 0% (1. 5 adjusted so that the capacitance 0/0>, and a styrene-based thermoplastic electromagnetic wave shielding material.
また、 ステンレス繊維束を被覆する樹脂として A S樹 脂 （ AS ) 又は G Pポリスチレン （ G P〉 を使用し、 ナ
チュラルペレツ 卜樹脂としてポリァミド （ P A ) 、 ポリ ァチレンテレフタレー 卜 （ PBT) 、 ポリカーボネー 卜 ( PC) 又は変性ポリフエ二レンオキサイ ド （ P PO〉 を使用し、 上記と同様にしてスチレン系熟可塑性電磁波 シールド材を調製した。 Also, AS resin (AS) or GP polystyrene (GP) is used as the resin for coating the stainless steel fiber bundle. Polyamide (PA), polyethylene terephthalate (PBT), polycarbonate (PC), or modified polyphenylene oxide (PPO) is used as the natural pellet resin, and a styrene-based thermoplastic electromagnetic wave shield is used in the same manner as described above. Materials were prepared.
このようにして調製された 6種のスチレン系熱可塑性 電磁波シールド材を使用し、 以下に示す 5機種の高速射 出成形機又は汎用射出成形機を用いて、 第 1表に示す種 々の成形条件で成形した。 Using the six types of styrene-based 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.
機種 A ： 東芝機械線製 I S 1 00 Model A: I S100 made by Toshiba Machine Line
型締カ Ί 00卜ン Mold clamp Ί 00 ton
射出率 1 1 Occ/sec. Injection rate 1 1 Occ / sec.
射出容量 25 Occ Injection capacity 25 Occ
機種 B ： 三菱重工線製 Ί 25 X 75 M S T Model B: Made by Mitsubishi Heavy Industries Line Ί 25 X 75 M ST
型締カ 75卜ン Mold clamp 75 ton
射出率 245cc/sec. - 射出容量 55 cc Injection rate 245cc / sec.- Injection capacity 55cc
機種 C ： 三菱重工㈱製 900 X 200 M S T Model C: 900 X 200 MST manufactured by Mitsubishi Heavy Industries, Ltd.
型締カ 220卜ン 220 clamps
射出率 623 ccノ sec. Injection rate 623 cc sec.
射出容量 406cc Injection capacity 406cc
機種 D ： テクノプラス㈱製 S I 4749 Model D: Techno Plus II S I 4749
' 型締カ 47卜ン - 射出率 425 cc/sec. '' Mold clamp 47 ton-Injection rate 425 cc / sec.
射出容量 49 cc Injection capacity 49 cc
機種 E ： 住友ネスタール㈱製 N 51 5/ 50
型締カ 50 卜ン Model E: Sumitomo Nestal Corporation N 51 5/50 Mold clamp 50 ton
射出率 4 7 7 cc/sec. Injection rate 4 7 7 cc / sec.
射出容量 2 54 cc Injection capacity 2 54 cc
次に、 得られた各成形品の表面の凹凸の状態及び体積 固有抵抗を測定した。 その結果を第 Ί 表に示す。 Next, the state of surface irregularities and the volume resistivity of each of the obtained molded articles were measured. The results are shown in Table III.
- なお、 比較のため、 同じ射出成形機と周じ金型を用い 本発明の条件から外れた成形条件で成形品を成形し、 そ の表面の凹凸の状態及び体積固有抵抗又は電磁波シール ド性能を測定した。 その結果を同じく第 Ί 表に示す。 なお、 第 Ί表において、 計算値 tは下記式 -For comparison, a molded product was molded under the same injection molding machine and peripheral mold under molding conditions that deviated from the conditions of the present invention, and the surface irregularities and volume resistivity or electromagnetic wave shielding performance Was measured. The results are also shown in Table II. In Table III, the calculated value t is
t = 8. 0 x 1 0 "3x {(Tr- Tm)/(100- Tm)}2 に成形条件の金型温度 Tin ( °C〉 及び溶融樹脂温度 Tr (で を代入して求めた値である。 また、 表面評価は表面粗さ 計を用いて最大粗さ Rmax を測定し、 〇 ： 表面の凹凸の Rmax ≤ 5 ^m、 Δ ： 5≤ Rm av ≤ 1 O ^m及び x ： 1 0 j in≤ Rmax の 3段階で評価した。 さらに、 シールド 性能については、 全ての実施例及び比較例において電磁 波シールド性能が電解 Ί 00MHz に対し 5 OdB以上又は 体積固有抵抗が Ί 01 Ω ♦ 以下であったため、 すべて 良好と判断した。
t = 8.0 x 1 0 " 3 x {(Tr-Tm) / (100-Tm)} 2 , substituting the mold temperature Tin (° C) and molten resin temperature Tr ( . the value addition, the surface evaluated by measuring the maximum roughness R max using a surface roughness meter, 〇: R max ≤ 5 ^ m of surface irregularities, Δ: 5≤ R ma v ≤ 1 O ^ m and x:. was evaluated in 1 0 3 stage j in≤ R max Moreover, the shield performance, the electromagnetic wave shielding performance in all of the examples and comparative examples electrolyte Ί 00MH z to 5 0 dB or more, or a volume resistivity Was Ί 0 1 Ω ♦ or less, so all were judged to be good.
産業上の利用可能性 Industrial applicability
本発明方法により定まる射出成形条件の下でスチレン 系熱可塑性樹脂をマ ト リ ックス樹脂として金属繊維を含 有する樹脂組成物を射出成形することにより、 成形品表 面の優れた樹脂製品の成形ができ、 例えば優れた電磁波 シールド性能を有する電子 ♦ 電気機器の筐体等を製造す ることができる。
By injection-molding a resin composition containing metal fibers using a styrene-based thermoplastic resin as a matrix resin under the injection molding conditions determined by the method of the present invention, molding of a resin product having an excellent surface of a molded product can be achieved. For example, it is possible to manufacture a housing of an electronic device having excellent electromagnetic wave shielding performance.
Claims
s主 s lord
δ目 求 の 範 囲 δ Range of demand
金属繊維を含有するスチレン系樹脂組成物を射 出成形するに際して、 金型温度を Tm (で） 、 溶融樹脂温 度を ΤΓ (Ό〉 としたとき、 金型内への樹脂組成物の充塡 時間 t (sec.〉 が、 When the styrenic resin composition containing metal fibers is injection-molded, when the mold temperature is Tm (() and the molten resin temperature is ΤΓ (Ό), the resin composition is filled into the mold. Time t (sec.)
ΐ≤ 8. 0 x 1 O"3x{(Tr-Tm)/(100-Tm)}2 となる条件で射出成形することを特徴とする金属鐡維を 含有する樹脂組成物の成形方法。 A method for molding a resin composition containing metallic iron, wherein the resin composition is injection-molded under the following condition: ΐ≤8.0 x 1 O " 3 x {(Tr-Tm) / (100-Tm)} 2 .
(2) スチレン系樹脂がボリスチレン、 スチレンーァ クリ ロニ卜リル共重合体、 スチレン一メタグリル酸メチ ル共重合体、 ゴム強化ポリスチレン、 A B S樹脂及び M B S樹脂からなる群から選ばれた Ί種又は 2種以上の熱 可塑性スチレン系樹 ξ旨である特許請求の範囲第 1項記載 の金属鐡維を含有する'樹脂の成形方法。
(2) The styrene resin is selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, styrene-methyl methacrylate copolymer, rubber-reinforced polystyrene, ABS resin, and MBS resin. 2. The method for molding a resin containing metallic iron according to claim 1, which is a thermoplastic styrene resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019880701035A KR920004737B1 (en) | 1986-12-24 | 1987-12-24 | Process for the molding resin composition containing metallic fiber |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61313638A JPS63160814A (en) | 1986-12-24 | 1986-12-24 | Molding method for resin containing metallic fiber |
| JP61/313638 | 1986-12-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1988004986A1 true WO1988004986A1 (en) | 1988-07-14 |
Family
ID=18043726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1987/001023 WO1988004986A1 (en) | 1986-12-24 | 1987-12-24 | Process for molding resin composition containing metallic fibers |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS63160814A (en) |
| KR (1) | KR920004737B1 (en) |
| GB (1) | GB2218937B (en) |
| WO (1) | WO1988004986A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1060998C (en) * | 1994-09-28 | 2001-01-24 | 松下电器产业株式会社 | Hollow structural member and method for making same |
| JPH0948062A (en) * | 1995-04-10 | 1997-02-18 | Matsushita Electric Ind Co Ltd | Molding method, molding device and molding |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58134721A (en) * | 1982-02-04 | 1983-08-11 | Aron Kasei Co Ltd | Thermoplastic resin formed product mixed with electric conductive filler |
| JPS58150203A (en) * | 1981-12-30 | 1983-09-06 | エヌ・ヴイ・ベカルト・エス・エイ | Prastic product with conductive fiber |
| JPS59124824A (en) * | 1983-01-05 | 1984-07-19 | Toshiba Chem Corp | Manufacture of electromagnetic wave-shielding synthetic resin injection molding |
| JPS61261013A (en) * | 1985-05-15 | 1986-11-19 | Hitachi Ltd | Manufacture of electromagnetically shielded cabinet |
-
1986
- 1986-12-24 JP JP61313638A patent/JPS63160814A/en active Granted
-
1987
- 1987-12-24 WO PCT/JP1987/001023 patent/WO1988004986A1/en unknown
- 1987-12-24 KR KR1019880701035A patent/KR920004737B1/en not_active IP Right Cessation
-
1988
- 1988-08-24 GB GB8820044A patent/GB2218937B/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58150203A (en) * | 1981-12-30 | 1983-09-06 | エヌ・ヴイ・ベカルト・エス・エイ | Prastic product with conductive fiber |
| JPS58134721A (en) * | 1982-02-04 | 1983-08-11 | Aron Kasei Co Ltd | Thermoplastic resin formed product mixed with electric conductive filler |
| JPS59124824A (en) * | 1983-01-05 | 1984-07-19 | Toshiba Chem Corp | Manufacture of electromagnetic wave-shielding synthetic resin injection molding |
| JPS61261013A (en) * | 1985-05-15 | 1986-11-19 | Hitachi Ltd | Manufacture of electromagnetically shielded cabinet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63160814A (en) | 1988-07-04 |
| JPH0333496B2 (en) | 1991-05-17 |
| KR890700069A (en) | 1989-03-02 |
| GB2218937A (en) | 1989-11-29 |
| GB2218937B (en) | 1990-11-28 |
| KR920004737B1 (en) | 1992-06-15 |
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