JPH07110517B2 - Method for manufacturing polyimide resin molded product - Google Patents
Method for manufacturing polyimide resin molded productInfo
- Publication number
- JPH07110517B2 JPH07110517B2 JP33463690A JP33463690A JPH07110517B2 JP H07110517 B2 JPH07110517 B2 JP H07110517B2 JP 33463690 A JP33463690 A JP 33463690A JP 33463690 A JP33463690 A JP 33463690A JP H07110517 B2 JPH07110517 B2 JP H07110517B2
- Authority
- JP
- Japan
- Prior art keywords
- polyimide resin
- mold
- molded product
- resin
- resin molded
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
Landscapes
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は高強度で、かつ成形品の側面にクラックが生じ
ないポリイミド樹脂成形品の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing a polyimide resin molded article which has high strength and does not cause cracks on the side surface of the molded article.
ポリイミド樹脂は耐熱性に極めて優れた樹脂であるが、
その軟化点があまりにも高いために通常の溶融成形が不
可能である。Polyimide resin is a resin with excellent heat resistance,
Its softening point is so high that normal melt molding is not possible.
したがって、従来からポリイミド樹脂を成形するにはポ
リイミド樹脂の粉末、あるいはこれに無機充填剤を添加
した樹脂配合物を金型内に充填し、加圧装置、たとえば
油圧プレス、空圧プレス、メカプレスを用いて加圧する
ことにより圧粉体を成形し、その後、この圧粉体を400
℃程度の高温に加熱して焼成し、ポリイミド樹脂成形品
を得る圧縮焼成成形法が採用されている。Therefore, conventionally, in order to mold a polyimide resin, a polyimide resin powder or a resin mixture obtained by adding an inorganic filler to the polyimide resin is filled in a mold, and a pressurizing device such as a hydraulic press, a pneumatic press, or a mechanical press is used. The green compact is molded by pressing using
A compression firing molding method is employed in which a polyimide resin molded article is obtained by heating at a high temperature of about 0 ° C. and firing.
ポリイミド樹脂を圧縮焼成して高強度の成形品を得るた
めには約2000〜5000kg/cm2の圧力をかける必要があり、
圧力が高い程、強度の高い成形品が得られるが、ある圧
力以上に加圧すると圧粉体の表面、特に側面にクラック
が生じ、商品価値がなくなる欠点があった。To the polyimide resin by compressing sintered to obtain a molded article of high strength must apply a pressure of about 2000~5000kg / cm 2,
The higher the pressure is, the higher the strength of the molded product is obtained, but when the pressure is higher than a certain pressure, cracks are generated on the surface of the green compact, especially on the side faces, and the commercial value is lost.
このクラックは圧縮の圧力を下げると発生しないが、圧
力が低いと成形品の強度が低下するという問題があっ
た。Although these cracks do not occur when the compression pressure is lowered, there is a problem that the strength of the molded article decreases when the pressure is low.
また、クラック発生を防止する手段として、金型のボロ
ンナイトライト、シリコーン、グラファイト等をスプレ
ーコートする方法が知られているがいずれも、十分な結
果を得ることはできなかった。Further, as a means for preventing the generation of cracks, a method of spray-coating a mold with boron nitrite, silicone, graphite, etc. is known, but none of them has been able to obtain a sufficient result.
本発明の目的はポリイミド樹脂あるいはポリイミド樹脂
と充填剤の配合物を圧縮焼成する際、高圧をかけても成
形品側面にクラックが発生しない成形品を製造する方法
を提供することにある。An object of the present invention is to provide a method for producing a molded product in which cracks do not occur on the side surface of the molded product even when a high pressure is applied when a polyimide resin or a mixture of a polyimide resin and a filler is compression-fired.
〔課題を解決するための手段〕 上記従来技術の問題点を解決するため、本発明は次の手
段をとるものである。[Means for Solving the Problems] In order to solve the problems of the above-mentioned conventional techniques, the present invention takes the following means.
即ち、本発明のポリイミド樹脂成形品の製造方法は、ポ
リイミド樹脂またはポリイミド樹脂と充填剤からなるポ
リイミド樹脂配合物を金型内で圧縮成形し、その後、焼
成して成形品を製造するに際し、該金型の内壁にフッ素
系樹脂を塗布することを特徴とするものである。That is, the method for producing a polyimide resin molded article of the present invention, a polyimide resin or a polyimide resin composition comprising a polyimide resin and a filler is compression-molded in a mold, then, when producing a molded article by firing, It is characterized in that a fluorine-based resin is applied to the inner wall of the mold.
本発明に用いるポリイミド樹脂は主として下記のポリイ
ミド樹脂を有しているものが使用される。The polyimide resin used in the present invention is mainly one having the following polyimide resin.
このポリイミド樹脂は、普通、ピロメリット酸無水物と
ジアミノジフェニルエーテルを反応させて作られるが、
酸成分またはジアミン成分の一部を他の酸又はジアミン
成分に置き替えた共重合物又は他の分子構造を有するポ
リイミド樹脂を一部混合してなる樹脂混合物も使用でき
るが、上記ポリイミド構造の樹脂が最適である。 This polyimide resin is usually made by reacting pyromellitic anhydride and diaminodiphenyl ether,
A resin mixture obtained by partially mixing a copolymer resin in which a part of the acid component or the diamine component is replaced with another acid or diamine component or a polyimide resin having another molecular structure can also be used, but the resin having the above polyimide structure Is the best.
本発明に用いるフッ素系樹脂は、ポリテトラフルオロエ
チレン樹脂又はそれの共重合体が使用可能であるが、ポ
リテトラフルオロエチレンが最適である。The fluororesin used in the present invention may be a polytetrafluoroethylene resin or a copolymer thereof, but polytetrafluoroethylene is most suitable.
フッ素系樹脂を金型内壁に塗布する方法は特に限定され
ないが、たとえば、市販の“テフロン（登録商標名）”
コーティング剤を塗装またはスプレーする方法を採用す
ることができる。The method of applying the fluorine-based resin to the inner wall of the mold is not particularly limited, but for example, commercially available "Teflon (registered trademark)"
A method of painting or spraying a coating agent can be adopted.
一方の、本発明のポリイミド樹脂には成形性、寸法安定
性、低吸水性等を付与する目的で種々の充填剤を添加す
ることができる。On the other hand, various fillers can be added to the polyimide resin of the present invention for the purpose of imparting moldability, dimensional stability, low water absorption and the like.
好ましい充填剤としてはガラス繊維、炭素繊維、無機ウ
イスカー等の繊維状物、タルク、シリカ、アルミナ、カ
オリン、ワラステナイト、ガラスビーズ、セラミック粉
末等が挙げられ、これらの添加量はポリイミド樹脂と充
填剤の合計量に対して10〜60重量％が好ましい。Preferred fillers include glass fibers, carbon fibers, fibrous materials such as inorganic whiskers, talc, silica, alumina, kaolin, wollastonite, glass beads, ceramic powder, and the like, and the addition amount of these is a polyimide resin and a filler. 10 to 60% by weight based on the total amount of is preferable.
また、充填剤の添加量が増すと成形品にクラックが発生
しやすくなるが、60重量％以下であれば、前記のフッ素
樹脂を金型に塗布することにより、これを防止すること
ができる。Further, when the amount of the filler added increases, cracks are likely to occur in the molded product, but if it is 60% by weight or less, this can be prevented by applying the fluororesin to the mold.
本発明における成形方法はポリイミド樹脂粉末をフッ素
樹脂を内壁に塗布した金型内で圧縮して圧粉体を成形
し、次いでこれを加熱焼成するが、圧粉体を作るための
圧力は2000〜5000kg/cm2が好ましく、また焼成温度は37
0〜430℃が好ましい。In the molding method of the present invention, a polyimide resin powder is compressed in a mold in which a fluororesin is applied to the inner wall to mold a green compact, and then this is heated and fired, but the pressure for producing the green compact is 2000- 5000 kg / cm 2 is preferable, and the firing temperature is 37
0 to 430 ° C is preferable.
以下、実施例を挙げて本発明を具体的に説明する。 Hereinafter, the present invention will be specifically described with reference to examples.
実施例１ 内径30φ、高さ150mmの金型を用いて30φ×10mmの円柱
状ポリイミド樹脂圧粉体を成形した。Example 1 A cylindrical polyimide resin powder compact of 30φ × 10 mm was molded using a mold having an inner diameter of 30φ and a height of 150 mm.
ポリイミド樹脂としては、ピロメリット酸無水物とジア
ミノジフェニルエーテルから重合した芳香族ポリイミド
を用いた。圧粉体の成形圧力は5ton/cm2とした。As the polyimide resin, an aromatic polyimide polymerized from pyromellitic anhydride and diaminodiphenyl ether was used. The molding pressure of the green compact was 5 ton / cm 2 .
金型の内面に“テフロン（登録商標名）”コーティング
（デュポン社製）を施した場合には成形圧粉体の側面に
クラックが発生しなかったが、金型内面がクロムメッキ
のものでは圧粉体側面にクラックを生じた。When "Teflon (registered trademark)" coating (made by DuPont) was applied to the inner surface of the mold, cracks did not occur on the side surface of the molded green compact. A crack was generated on the side surface of the powder.
実施例２ 実施例１に使用したポリイミド樹脂を用いて実施例１に
て使用した金型で成形圧を変えて成形した。その結果は
表１の通りであり、金型内面がクロムメッキの場合に
は、成形圧が1ton/cm2以下の場合に限り、圧粉体側面に
クラックの発生がなかったがテフロン（登録商標名）塗
装金型を用いた場合には5ton/cm2の圧力をかけた場合で
もクラックの発生はなかった。Example 2 The polyimide resin used in Example 1 was used to mold with the mold used in Example 1 while changing the molding pressure. The results are shown in Table 1. When the inner surface of the mold was chrome plated, cracks did not occur on the side surface of the green compact only when the molding pressure was 1 ton / cm 2 or less. When a coating die was used, no crack was generated even when a pressure of 5 ton / cm 2 was applied.
実施例３ 実施例１の“テフロン（登録商標名）”塗装の代りにダ
イキン工業（株）製のネオフロンを用いた。結果は実施
例１と同じくクロムメッキではクラックを生じたが“ネ
オフロン（登録商標名）”塗装品ではクラックを生じな
かった。 Example 3 Instead of the "Teflon (registered trademark)" coating of Example 1, Neoflon manufactured by Daikin Industries, Ltd. was used. As a result, similarly to Example 1, the chrome plating caused cracks, but the "NEOFLON (registered trademark)" coated product did not cause cracks.
〔発明の効果〕 本発明は金型の内面にフッ素系樹脂を塗布して圧縮成形
するポリイミド樹脂形成品の製造方法であるため、成形
品の表面、側に側面にクラックが発生しない。[Effect of the Invention] Since the present invention is a method for producing a polyimide resin-formed product in which a fluorine-based resin is applied to the inner surface of a mold and compression-molded, cracks do not occur on the surface and side surfaces of the molded product.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｋ 105:06 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location B29K 105: 06
Claims (1)
填剤からなるポリイミド樹脂配合物を金型内で圧縮成形
し、その後、焼成して成形品を製造するに際し、該金型
の内壁にフッ素系樹脂を塗布することを特徴とするポリ
イミド樹脂成形品の製造方法。1. When a polyimide resin or a polyimide resin compound comprising a polyimide resin and a filler is compression molded in a mold and then fired to produce a molded article, a fluorine-based resin is applied to the inner wall of the mold. A method for producing a polyimide resin molded article, characterized by applying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33463690A JPH07110517B2 (en) | 1990-11-30 | 1990-11-30 | Method for manufacturing polyimide resin molded product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33463690A JPH07110517B2 (en) | 1990-11-30 | 1990-11-30 | Method for manufacturing polyimide resin molded product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04201434A JPH04201434A (en) | 1992-07-22 |
| JPH07110517B2 true JPH07110517B2 (en) | 1995-11-29 |
Family
ID=18279594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33463690A Expired - Fee Related JPH07110517B2 (en) | 1990-11-30 | 1990-11-30 | Method for manufacturing polyimide resin molded product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07110517B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08132534A (en) * | 1994-11-09 | 1996-05-28 | Kanegafuchi Chem Ind Co Ltd | Method for molding aromatic polyimide resin |
-
1990
- 1990-11-30 JP JP33463690A patent/JPH07110517B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04201434A (en) | 1992-07-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |