JP3571750B2 - Prepreg sheet - Google Patents
Prepreg sheet Download PDFInfo
- Publication number
- JP3571750B2 JP3571750B2 JP7078094A JP7078094A JP3571750B2 JP 3571750 B2 JP3571750 B2 JP 3571750B2 JP 7078094 A JP7078094 A JP 7078094A JP 7078094 A JP7078094 A JP 7078094A JP 3571750 B2 JP3571750 B2 JP 3571750B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- frame
- prepreg
- resin
- prepreg sheet
- 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 - Lifetime
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Description
【０００１】
【産業上の利用分野】
本発明は、プリプレグシートの改良に関するものである。
【０００２】
【従来の技術】
従来から一般に使用されているプリプレグシートは、常温で流動性を示さない樹脂（但しタックは有する）が、強化繊維シートに含浸されて架体シート上に仮固定された構造を有していた。
ところが常温で流動性を示す樹脂（以下ウェットレジンという）はその取扱性の悪さから実用に至っていないのが現状であり、試験的に作られることがあっても架体シート上にウェットレジンと強化繊維シートが置かれ、さらにその上部に被覆材（以下トップシートという）としてフィルム等が置かれた３層構造とするのが一般的であった。
【０００３】
【発明が解決しようとする課題】
しかしながら、このような構造では使用に際しトップシートの剥離はウェットレジンの表面張力のため極めて困難であり、またウェットレジンは架体シートとトップシートとの間に流れ出して樹脂含有率の変動を来すと同時に汚れ等の問題を引き起こす原因ともなっていた。
本発明は、上記問題点を解消し、トップシートの剥離が容易でウエットレジンの流れ出しのないプリプレグシートの提供を課題とする。
【０００４】
【課題を解決するための手段】
上記課題は、常温で流動性を有する樹脂と強化繊維シートとから成る構成物が架体シート上に置かれ、この架体シートが構成物の両端に於いて折返されて構成物を包み込んでいるプリプレグシートの巻取り体であって、この架体シートが片面に凹部を有し他方の面に凸部を有するエンボスフィルムであり、構成物が架体シートの凹部を有する面上に置かれているプリプレグシートの巻取り体によって解決される。
【０００５】
以下本発明を図面によって詳細に説明する。
図１は、本発明のプリプレグシートの１例を示す斜視図で、同図において矢印はプリプレグシートの長手方向を示す。
ウェットレジンと強化繊維シートから成る構成物（１）の巾方向の両端に於て、架体シート（２）が構成物（１）の上部に折返され、構造物（１）を両端部に於て包み込んでいる。架体シートの折返された部分の長さは、通常約２０〜１００ｍｍ程度であるが、全周に及んでも差し支えない。
【０００６】
本発明で用いられる強化繊維シートは、炭素繊維，ガラス繊維などの一方向シート，クロス等であり、その種類を特に限定するものではない。
また、常温で流動性を有するウェットレジンは、一般には常温で数万ポイズ以下の粘度を有するレジンであるが、本発明に於いてはその種類及び粘度を限定するものではなく常温（およそ３５℃以下の大気温）で流れが生ずる様な樹脂であればよい。
【０００７】
さらに、ウェットレジンと強化繊維シートから成る構成物は、ウェットレジンが強化繊維シート中に完全に含浸された状態、又は架体シート（２）上に塗布されたウェットレジンに強化繊維シートが重ねられた所謂未含浸状態、或いはこれらの中間の状態即ち含浸状態と未含浸状態の混在状態の構成物である。
【０００８】
本発明に用いられる架体シートは、ウェットレジンを通過させないシートであり、その材質を限定する物ではなく一般にはポリオレフィンフィルムが適当である。特に、１００ミクロン以下のポリオレフィンフィルムにエンボッシングによりその表面に凹凸部を形成せしめたエンボッシングフィルムであることが特に好ましい。
【０００９】
この様なエンボスフィルムを架体シートとして用いる場合には、図２（本発明のプリプレグシートの他の例を示す斜視図）に示す様に凹部を有する面（２−１）にウェットレジンと強化繊維シートの構成物（１）を置き、その両端部に於て凸部を有する面（２−２）が上部になる様に使用される。この様な使用例に於ては架体シートと共にプリプレグシートを巻込む時にはその層間の付着力を低減し、剥離を容易にすると同時に両端部に於てフィルム間に間隙が生ずるためウェットレジンの表面張力によるにじみ出しを防止することが可能になる。さらに、強化繊維シートに未含浸部が存在するときには時間の経過と共に含浸が進行し、置換された空気の排出経路となって含浸促進の効果が発揮される。
【００１０】
また、逆の使用方法［エンボスの凸部を有する面（２−２）に構成物（１）を置き、折返し部で凹部を有する面（２−１）が上部となるように使用する方法］も適用可能である。この方法はプリプレグを積層後架体シートの剥離を容易にするのに有効であり、ウェットレジンの滲出防止と含浸促進効果は程度の差こそあれ維持される。
【００１１】
この様な効果を奏するシートとしては、上述の片面に凹部他面に凸部を有するシートの他、両面に凹凸部を有するシート、又は何れかの面に凹部又は凸部を有するシートを挙げることができる。また凹凸部は線状又は点状（面を含む）であることが好ましい。
以下実施例により本発明をさらに具体的に説明する。
【００１２】
【実施例】
厚さ３０ミクロンのポリプロピレンフィルムの長手方向に対し、±４５°に２．５ｍｍピッチ、高さ０．１５ｍｍの線状凸部（他面は線状凹部となる）を有する巾４０ｃｍのエンボスフィルム（片面に凸部、他面に凹部がある通称ダイヤ柄と云われるエンボスフィルム）の凹部を有する面に常温で流動性を有する粘度３０ポイズ（２０℃）のエポキシ樹脂を巾３０ｃｍ、塗布量１８０ｇ／ｍ２ の割合で塗布した上に３００ｇ／ｍ２ の目付を有する巾３０ｃｍの一方向炭素繊維シートを重ねてエンボスフィルムの両端約５ｃｍを図２に示す様な形に折返し、ガイドを用いて連続的に折返して、図２の如く上部が内巻となるように（即ち一方向シートが内側、エンボスフィルムが外側となるように）巻取った。
巻取ったプリプレグシートを２４時間放置後も、巻取られたプリプレグシートの側面からのウェットレジンの滲出しは全く見られず、またウェットレジンは完全に一方向シート内に含浸されており、さらにエンボスフィルムの剥離も極めて容易であった。
【００１３】
【発明の効果】
本発明のプリプレグシートは、トップシートの剥離が容易でウエットレジンの流れ出しがなく、これによってウエットレジンを用いたプリプレグシートの実用化が可能となり、しかもプリプレグシートの製造に於てウエットレジンを単に強化繊維シート上に置いておくだけで含浸可能となり、その工業的効果は極めて大である。
【図面の簡単な説明】
【図１】本発明のプリプレグシートの一例を示す斜視図である。
【図２】本発明のプリプレグシートの他の例を示す斜視図である。
【符号の説明】
１ 常温で流動性を有する樹脂と強化繊維シートとから成る構成物
２ 架体シート
２−１ 架体シートの凹部を有する面
２−２ 架体シートの凸部を有する面[0001]
[Industrial applications]
The present invention relates to an improvement of a prepreg sheet.
[0002]
[Prior art]
Conventionally, a prepreg sheet generally used has a structure in which a resin that does not exhibit fluidity at room temperature (but has a tack) is impregnated into a reinforcing fiber sheet and temporarily fixed on a frame sheet.
However, at present, resins that show fluidity at room temperature (hereinafter referred to as wet resins) have not been put into practical use due to poor handling properties. In general, a three-layer structure in which a fiber sheet is placed and a film or the like is placed thereon as a covering material (hereinafter, referred to as a top sheet) is generally used.
[0003]
[Problems to be solved by the invention]
However, in such a structure, peeling of the top sheet is extremely difficult due to the surface tension of the wet resin when used, and the wet resin flows out between the frame sheet and the top sheet to cause a change in the resin content. At the same time, it was a cause of problems such as dirt.
An object of the present invention is to solve the above problems and to provide a prepreg sheet from which a top sheet can be easily peeled and a wet resin does not flow out.
[0004]
[Means for Solving the Problems]
Above-mentioned problems, a configuration composed of a resin having fluidity at ordinary temperature reinforcing fiber sheet is placed stiff sheet, which encloses the construct this hard sheet is folded at the ends of the construct A wound body of a prepreg sheet, wherein the frame sheet is an embossed film having a concave portion on one surface and a convex portion on the other surface, and the component is placed on the surface of the frame sheet having the concave portion. Is solved by the wrapping body of the prepreg sheet .
[0005]
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing an example of the prepreg sheet of the present invention, in which arrows indicate the longitudinal direction of the prepreg sheet.
At both ends in the width direction of the structure (1) composed of the wet resin and the reinforcing fiber sheet, the frame sheet (2) is folded over the structure (1), and the structure (1) is positioned at both ends. Wrapped around. The length of the folded-back portion of the frame sheet is usually about 20 to 100 mm, but may be all around.
[0006]
The reinforcing fiber sheet used in the present invention is a unidirectional sheet such as carbon fiber or glass fiber, cloth, etc., and the type thereof is not particularly limited.
The wet resin having fluidity at room temperature is generally a resin having a viscosity of tens of thousands poise or less at room temperature. However, in the present invention, the type and viscosity are not limited, and the room temperature (about 35 ° C.) Any resin can be used as long as a flow occurs at the following ambient temperature.
[0007]
Furthermore, the composition comprising the wet resin and the reinforcing fiber sheet may be in a state in which the wet resin is completely impregnated in the reinforcing fiber sheet, or in a state where the reinforcing fiber sheet is superimposed on the wet resin applied on the frame sheet (2). A so-called non-impregnated state, or an intermediate state between them, that is, a mixed state of an impregnated state and an unimpregnated state.
[0008]
The frame sheet used in the present invention is a sheet that does not pass through a wet resin, and its material is not limited, and a polyolefin film is generally suitable. In particular, an embossing film obtained by forming an uneven portion on the surface of a polyolefin film of 100 microns or less by embossing is particularly preferable.
[0009]
When such an embossed film is used as a frame sheet, as shown in FIG. 2 (a perspective view showing another example of the prepreg sheet of the present invention), a surface (2-1) having a concave portion is reinforced with a wet resin. The component (1) of the fiber sheet is placed, and the fiber sheet is used so that the surface (2-2) having the convex portion at both ends faces upward. In such a usage example, when the prepreg sheet is wound together with the frame sheet, the adhesion between the layers is reduced, and the separation is facilitated, and at the same time, a gap is formed between the films at both ends. Bleeding due to tension can be prevented. Furthermore, when an unimpregnated portion exists in the reinforcing fiber sheet, the impregnation proceeds with the passage of time, and the impregnated portion becomes a discharge path of the replaced air, thereby exhibiting the effect of accelerating the impregnation.
[0010]
In addition, the reverse usage [method of placing the component (1) on the surface (2-2) having the embossed convex portion, and using the folded portion so that the surface (2-1) having the concave portion becomes the upper portion] Is also applicable. This method is effective for facilitating the peeling of the frame sheet after laminating the prepreg, and the effect of preventing the exudation of the wet resin and the effect of promoting the impregnation are maintained to some extent.
[0011]
Examples of the sheet having such an effect include, in addition to the above-described sheet having a concave portion on one surface and a convex portion on the other surface, a sheet having concave and convex portions on both surfaces, or a sheet having a concave portion or a convex portion on any surface. Can be. Further, the uneven portion is preferably linear or dot-like (including a surface).
Hereinafter, the present invention will be described more specifically with reference to examples.
[0012]
【Example】
An embossed film having a width of 40 cm having a linear convex portion (a linear concave portion on the other surface) having a pitch of 2.5 mm at ± 45 ° and a height of 0.15 mm with respect to the longitudinal direction of a polypropylene film having a thickness of 30 μm ( An embossed film called a diamond pattern having a convex portion on one side and a concave portion on the other side) is coated with epoxy resin having a viscosity of 30 poise (20 ° C.) having a fluidity at room temperature at a width of 30 cm and an application amount of 180 g / on coated at a rate of m 2 overlapping unidirectional carbon fiber sheets having a width of 30cm with basis weight of 300 g / m 2 folded into the shape as shown in FIG. 2 both ends approximately 5cm of the embossed film, successively with a guide Then, as shown in FIG. 2, the film was wound so that the upper part was inwardly wound (that is, the one-way sheet was on the inside and the embossed film was on the outside).
Even after leaving the wound prepreg sheet for 24 hours, no oozing of the wet resin from the side surface of the wound prepreg sheet was observed, and the wet resin was completely impregnated in the one-way sheet. The removal of the embossed film was also very easy.
[0013]
【The invention's effect】
The prepreg sheet of the present invention is easy to peel off the top sheet and does not flow out of the wet resin, thereby enabling the practical use of the prepreg sheet using the wet resin, and further simply strengthening the wet resin in the production of the prepreg sheet. It can be impregnated simply by placing it on a fiber sheet, and its industrial effect is extremely large.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a prepreg sheet of the present invention.
FIG. 2 is a perspective view showing another example of the prepreg sheet of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Composition which consists of resin which has fluidity at normal temperature, and a reinforcing
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7078094A JP3571750B2 (en) | 1994-04-08 | 1994-04-08 | Prepreg sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7078094A JP3571750B2 (en) | 1994-04-08 | 1994-04-08 | Prepreg sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07276358A JPH07276358A (en) | 1995-10-24 |
| JP3571750B2 true JP3571750B2 (en) | 2004-09-29 |
Family
ID=13441386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7078094A Expired - Lifetime JP3571750B2 (en) | 1994-04-08 | 1994-04-08 | Prepreg sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3571750B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4989822B2 (en) * | 2001-04-27 | 2012-08-01 | 三菱レイヨン株式会社 | Manufacturing method of prepreg |
| WO2004037505A1 (en) | 2002-10-23 | 2004-05-06 | Mitsubishi Rayon Co.,Ltd. | Prepreg and method of manufacturing the prepreg |
| JP2012111957A (en) * | 2012-02-10 | 2012-06-14 | Mitsubishi Rayon Co Ltd | Prepreg |
| JP6057118B2 (en) * | 2012-07-10 | 2017-01-11 | 三菱レイヨン株式会社 | Prepreg |
-
1994
- 1994-04-08 JP JP7078094A patent/JP3571750B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07276358A (en) | 1995-10-24 |
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