JP4962329B2 - Prepreg and fiber reinforced composite materials - Google Patents

Prepreg and fiber reinforced composite materials Download PDF

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JP4962329B2
JP4962329B2 JP2008009439A JP2008009439A JP4962329B2 JP 4962329 B2 JP4962329 B2 JP 4962329B2 JP 2008009439 A JP2008009439 A JP 2008009439A JP 2008009439 A JP2008009439 A JP 2008009439A JP 4962329 B2 JP4962329 B2 JP 4962329B2
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prepreg
nonwoven fabric
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JP2009167349A (en
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友裕 伊藤
義典 玉田
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Yokohama Rubber Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a prepreg and a fiber-reinforced composite material enhancing impact resistance while facilitating handling of nonwoven fabrics. <P>SOLUTION: In a prepreg 1 produced by embedding in a thermosetting matrix resin a reinforcement substrate 2 in which reinforcement fibers 2a consisting of a continuous fiber are oriented, a nonwoven fabric 4 is disposed in which continuous fibers 4a made of a thermoplastic resin are oriented in the direction of orientation of the reinforcement fibers 2a, on the side of at least one of the prepreg surfaces from the reinforcement substrate 2. The fiber-reinforced composite material is produced by laminating and curing a plurality of the prepregs 1. The basis weight of the nonwoven fabric 4 preferably ranges 3-30 g/m<SP>2</SP>. Polyesters are preferably used as the primary component of the thermoplastic resin composing the continuous fibers 4a of the nonwoven fabric 4. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

本発明は、熱硬化性樹脂をマトリックス樹脂としたプリプレグ及び繊維補強複合材料に関し、更に詳しくは、耐衝撃性に優れたプリプレグ及び繊維補強複合材料に関する。   The present invention relates to a prepreg and a fiber-reinforced composite material using a thermosetting resin as a matrix resin, and more particularly to a prepreg and a fiber-reinforced composite material excellent in impact resistance.

炭素繊維などの補強繊維に熱硬化性マトリクス樹脂を含浸させたプリプレグを積層して硬化させた繊維補強複合材料は、軽量で耐熱性が高く機械的強度も高いため、航空機の構造材料として広く適用されている。しかし、マトリックス樹脂の伸度が低くて脆いため、靭性（耐衝撃性）に劣る欠点があり、衝撃を受けた際の内部破壊により強度が低下するという問題がある。   Fiber reinforced composites made by laminating and curing prepregs impregnated with thermosetting matrix resin on reinforcing fibers such as carbon fibers are lightweight, heat resistant and mechanically strong, and are widely used as aircraft structural materials. Has been. However, since the elongation of the matrix resin is low and brittle, there is a disadvantage that it is inferior in toughness (impact resistance), and there is a problem that the strength is reduced due to internal fracture when subjected to an impact.

そこで、従来、上記対策として、例えば、プリプレグの表面に靭性に優れた熱可塑性の有機繊維をランダムに配向した不織布を配置することにより、衝撃を緩和すると共に衝撃時の亀裂が伝播して繊維補強複合材料の層間で進行するのを抑制するようにした技術が知られている（例えば、特許文献１参照）。しかしながら、このように有機繊維をランダムに配向した不織布は、以下のような問題ある。   Therefore, conventionally, as a countermeasure, for example, by arranging a nonwoven fabric in which thermoplastic organic fibers having excellent toughness are randomly oriented on the surface of the prepreg, the impact is mitigated and cracks at the time of propagation propagate to reinforce the fiber. A technique is known that suppresses progress between layers of a composite material (see, for example, Patent Document 1). However, the nonwoven fabric in which organic fibers are randomly oriented as described above has the following problems.

不織布の追加はプリプレグのタックやドレイプに影響するので、できるだけ目付けが低いもの（３０ｇ／ｍ２以下）がよいが、そのような不織布は取り扱い時に加わる張力により変形や破断が発生し易く、それを回避するために張力を緩めると、蛇行やうねり（しわ）が発生し易くなり、取り扱いに難がある。
特開平１０−１５８４１７号公報 The addition of non-woven fabric affects the prepreg tack and drape, so it should be as low as possible (30 g / m 2 or less). When the tension is loosened to avoid it, meandering and undulation (wrinkles) are likely to occur, and handling is difficult.
Japanese Patent Laid-Open No. 10-158417

本発明の目的は、不織布の取り扱いを容易にしながら、耐衝撃性を高めることが可能なプリプレグ及び繊維補強複合材料を提供することにある。   An object of the present invention is to provide a prepreg and a fiber-reinforced composite material capable of improving impact resistance while facilitating handling of a nonwoven fabric.

上記目的を達成する本発明のプリプレグは、強度３０００ＭＰａ以上の炭素繊維の長繊維からなる補強繊維を配向した補強基材を熱硬化性マトリックス樹脂中に埋設したプリプレグにおいて、該補強基材より少なくとも一方のプリプレグ表面側に熱可塑性樹脂製の長繊維を前記補強繊維の配向方向に配向した不織布を配置し、該不織布の長繊維が任意の位置で３０ｃｍの長さを取ることを許容する長さを有し、前記不織布において前記長繊維の任意の位置で３０ｃｍの長さを取ってその両端間を直線で結んだ時の直線の角度が前記補強繊維の配向方向に対して５度以下となるように延在する長繊維の比率を４０〜１００％とし、該不織布の目付を３〜３０ｇ／ｍ２とし、前記熱硬化性マトリックス樹脂と不織布の重量の総和が、プリプレグ全重量の３０〜６０重量％であるようにしたことを特徴とする。 The prepreg of the present invention that achieves the above object is a prepreg in which a reinforcing base material in which reinforcing fibers made of carbon fibers having a strength of 3000 MPa or more are oriented is embedded in a thermosetting matrix resin. A non-woven fabric in which long fibers made of thermoplastic resin are oriented in the orientation direction of the reinforcing fibers is disposed on the prepreg surface side of the prepreg, and the length allowing the long fibers of the non-woven fabric to take a length of 30 cm at an arbitrary position. And having a length of 30 cm at an arbitrary position of the long fiber in the nonwoven fabric and connecting the both ends with a straight line so that the angle of the straight line is 5 degrees or less with respect to the orientation direction of the reinforcing fiber. the proportion of long fibers which extend to 40 to 100 percent, a basis weight of the nonwoven fabric and 3 to 30 g / m @ 2, the sum of the weight of the thermosetting matrix resin and the nonwoven fabric, a prepreg total Characterized in that as from 30 to 60% by weight.

本発明の繊維補強複合材料は、上記プリプレグを複数積層して硬化させてなることを特徴とする。   The fiber-reinforced composite material of the present invention is characterized in that a plurality of the prepregs are laminated and cured.

上述した本発明によれば、配向性の不織布を用いるため、不織布に一方向から張力を加えても不織布に変形や破断が発生し難くなり、不織布の取り扱いが容易となる。   According to the above-described present invention, since the oriented nonwoven fabric is used, even if tension is applied to the nonwoven fabric from one direction, the nonwoven fabric is hardly deformed or broken, and the nonwoven fabric can be easily handled.

他方、不織布には靭性に優れた熱可塑性樹脂を用いるので、従来の非配向性の不織布と同様に、衝撃を緩和すると共に衝撃時の亀裂が伝播して繊維補強複合材料の層間で進行するのを抑えることができる。従って、衝撃による内部破壊を抑え、耐衝撃性を向上することができる。   On the other hand, since a thermoplastic resin with excellent toughness is used for the nonwoven fabric, the impact is reduced and cracks at the time of propagation propagate between the layers of the fiber-reinforced composite material as in the case of the conventional non-oriented nonwoven fabric. Can be suppressed. Therefore, internal destruction due to impact can be suppressed and impact resistance can be improved.

しかも、不織布の長繊維を補強繊維の配向方向に配向することで、不織布をロールから引き出しながらプリプレグを製造することが可能になるので、プリプレグの生産性が阻害されることがない。   In addition, by orienting the long fibers of the nonwoven fabric in the orientation direction of the reinforcing fibers, it becomes possible to produce the prepreg while pulling the nonwoven fabric from the roll, so that the productivity of the prepreg is not hindered.

以下、本発明の実施の形態について添付の図面を参照しながら詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

図１，２は本発明のプリプレグの一実施形態を示し、このプリプレグ１は、長繊維からなる補強繊維２ａを一方向に引き揃えて配向させた補強基材２を熱硬化性マトリックス樹脂からなる樹脂層３中に埋設した構造になっている。補強基材２より樹脂層３の上面３ａ側には、熱可塑性樹脂製の長繊維４ａを補強繊維２の配向方向に配向(延在)させた配向性の不織布４が埋設されている。不織布４は、図３に示すように、補強基材２より樹脂層３の下面３ｂ側にも埋設してもよく、少なくとも一方のプリプレグ表面側に配置するようにすればよい。   1 and 2 show an embodiment of the prepreg of the present invention. This prepreg 1 is made of a thermosetting matrix resin having a reinforcing substrate 2 in which reinforcing fibers 2a made of long fibers are aligned in one direction and oriented. The structure is embedded in the resin layer 3. An oriented non-woven fabric 4 in which long fibers 4a made of thermoplastic resin are oriented (extended) in the orientation direction of the reinforcing fibers 2 is embedded in the upper surface 3a side of the resin layer 3 from the reinforcing base 2. As shown in FIG. 3, the nonwoven fabric 4 may be embedded on the lower surface 3 b side of the resin layer 3 with respect to the reinforcing base 2, and may be arranged on at least one prepreg surface side.

補強基材２の補強繊維２ａとしては、強度３０００ＭＰａ以上の炭素繊維を強度の点から用いる。補強繊維２ａの形態は、長繊維状モノフィラメントであっても、これらを束にしたものであってもよい。 The reinforcing fibers 2a of the reinforcing base material 2, used-strength 3000MPa or more of the carbon fiber from the strength point. The form of the reinforcing fiber 2a may be a long-fiber monofilament or a bundle of these.

熱硬化性マトリックス樹脂に使用する樹脂としても、従来と同様のものが使用でき、例えば、エポキシ樹脂、ビスマレイミド樹脂、不飽和ポリエステル樹脂、ポリイミド樹脂などを挙げることができる。好ましくは、２官能以上のエポキシ樹脂を主成分とするものを使用するのが複合材成形性の点からよい。   As the resin used for the thermosetting matrix resin, those similar to the conventional one can be used, and examples thereof include an epoxy resin, a bismaleimide resin, an unsaturated polyester resin, and a polyimide resin. It is preferable from the viewpoint of moldability of the composite material to use a bifunctional or higher functional epoxy resin as a main component.

不織布４の長繊維４ａに使用する熱可塑性樹脂としては、衝撃を緩和すると共に衝撃時の亀裂の伝播を抑制することができれば、いずれの熱可塑性樹脂を使用してもよく、例えば、ポリエステル、ポリアラミド、ポリアセタール、ポリアミド、ポリイミド、ポリエーテルイミド、ポリエーテルサルフォンなどを挙げることができる。これらの樹脂を単独、或いは２つ以上ブレンドして使用することができる。好ましくは、長繊維４ａを構成する熱可塑性樹脂の主成分をポリエステルにするのが、入手性とコストの点からよい。   As the thermoplastic resin used for the long fibers 4a of the nonwoven fabric 4, any thermoplastic resin may be used as long as it can mitigate the impact and suppress the propagation of cracks at the time of impact. For example, polyester, polyaramid , Polyacetal, polyamide, polyimide, polyetherimide, polyethersulfone and the like. These resins can be used alone or in a blend of two or more. Preferably, the main component of the thermoplastic resin constituting the long fibers 4a is made of polyester from the viewpoint of availability and cost.

不織布４の目付は、３〜３０ｇ／ｍ２の範囲にする。不織布４の目付が３ｇ／ｍ２より低くなると、衝撃を緩和すると共に衝撃時の亀裂の伝播を効果的に抑制することが難しくなる。逆に３０ｇ／ｍ２を超えると、不織布４に対してマトリックス樹脂が含浸し難くなり、プリプレグ１の作業性（タックやドレイプ）を良好な状態に維持できなくなることに加えて、プリプレグ１層当たりの厚みが厚くなりすぎる結果をもたらす。好ましくは、プリプレグ厚み増加の最小限化及び作業性維持の点から１０ｇ／ｍ２以下にするのがよい。 With eyes nonwoven 4, that be in the range of 3 to 30 g / m 2. When the basis weight of the nonwoven fabric 4 is lower than 3 g / m 2, it is difficult to mitigate the impact and effectively suppress the propagation of cracks during the impact. On the other hand, if it exceeds 30 g / m 2 , it becomes difficult for the nonwoven fabric 4 to be impregnated with the matrix resin, and the workability (tack and drape) of the prepreg 1 cannot be maintained in a good state. The result is that the thickness of the film becomes too thick. Preferably, it should be 10 g / m 2 or less from the viewpoint of minimizing the increase in prepreg thickness and maintaining workability.

不織布４は、各長繊維４ａが補強繊維２ａの配向方向に対して平行に延在する必要はなく、補強繊維２ａの配向方向に対して平面視で５度以下で延在する長繊維４ａの比率が全体の４０〜１００％の範囲である。比率が４０％より低いと、ランダム配列した不織布と同様の問題が生じる。なお、ここで言う５度以下の角度とは、長繊維３ａの任意の位置で３０ｃｍの長さを取り、その両端間を直線で結んだ時の直線の角度である。 The nonwoven fabric 4 does not have to have each long fiber 4a extending in parallel with the orientation direction of the reinforcing fiber 2a, and the long fiber 4a extending at 5 degrees or less in plan view with respect to the orientation direction of the reinforcing fiber 2a. ratio of Ru 40 to 100% of the range der of the total. When the ratio is lower than 40%, the same problem as that of the randomly arranged nonwoven fabric occurs. In addition, the angle of 5 degrees or less said here is a straight angle when taking the length of 30 cm in the arbitrary positions of the long fiber 3a, and connecting the both ends with a straight line.

熱硬化性マトリックス樹脂と不織布４の重量の総和としては、プリプレグ全重量の３０〜６０重量％に範囲にする。重量の総和が３０重量％より低いと、成形品に樹脂欠損などの欠陥を生じ易くなる。逆に６０重量％を超えると、成形品物性に対する繊維の寄与率が下がり、十分な強度が得られ難くなる。 The sum of the weight of the thermosetting matrix resin and the nonwoven fabric 4, that be in the range 30 to 60% by weight of the prepreg total weight. If the total weight is lower than 30% by weight, defects such as resin defects are likely to occur in the molded product. On the other hand, if it exceeds 60% by weight, the contribution ratio of the fibers to the physical properties of the molded product is lowered, and it becomes difficult to obtain sufficient strength.

上述した図１に示すプリプレグ１は、例えば、図４に示すようにして製造することができる。幅方向に配列した複数のリール１１から引き出された補強繊維２ａの群の上側に、ロール１２から引き出された不織布４をローラー１３を介して供給し、補強繊維２ａ群と不織布４を上下に並べて搬送する。上下のロール１４から樹脂フィルム１５を巻き出して加熱ローラー１６により樹脂フィルム１５を加熱圧着し、樹脂フィルム１５の樹脂を並走する補強繊維２群と不織布４に含浸させることで、長尺の図１に示す構成のプリプレグ１を得ることができる。なお、図中１７は離型紙で、この上に樹脂を塗布することにより樹脂フィルム１５を形成している。１８は離型紙の巻き取りロールである。   The prepreg 1 shown in FIG. 1 described above can be manufactured, for example, as shown in FIG. The nonwoven fabric 4 drawn from the roll 12 is supplied via a roller 13 to the upper side of the group of reinforcing fibers 2a drawn from the plurality of reels 11 arranged in the width direction, and the reinforcing fiber 2a group and the nonwoven fabric 4 are arranged vertically. Transport. The resin film 15 is unwound from the upper and lower rolls 14, the resin film 15 is heated and pressure-bonded by the heating roller 16, and the reinforcing fiber 2 group running in parallel with the resin of the resin film 15 and the nonwoven fabric 4 are impregnated. 1 can be obtained. In the figure, reference numeral 17 denotes a release paper, on which a resin film 15 is formed by applying a resin. Reference numeral 18 denotes a release paper take-up roll.

本発明の繊維補強複合材料は、上述したプリプレグ１を複数積層して加熱により硬化させたものである。   The fiber-reinforced composite material of the present invention is obtained by laminating a plurality of the prepregs 1 described above and curing them by heating.

上述した本発明によれば、配向性の不織布４を使用することで、一方向から張力を加えても不織布４が容易に変形や破断しなくなるため、取り扱いが容易になる。   According to the present invention described above, the use of the oriented nonwoven fabric 4 facilitates handling because the nonwoven fabric 4 does not easily deform or break even when tension is applied from one direction.

不織布４に靭性に優れた熱可塑性樹脂を使用するので、従来の非配向性の不織布と同様に、衝撃を緩和すると共に衝撃時の亀裂が伝播して繊維補強複合材料の層間で進行するのを抑制することができる。そのため、衝撃による内部破壊を抑えることができるので、耐衝撃性を高めることができる。   Since the non-woven fabric 4 is made of a thermoplastic resin having excellent toughness, the impact is reduced and cracks at the time of propagation are propagated between layers of the fiber-reinforced composite material as in the case of the conventional non-oriented non-woven fabric. Can be suppressed. Therefore, internal destruction due to impact can be suppressed, and impact resistance can be improved.

更に、不織布４の長繊維４ａを補強繊維２の配向方向に配向することで、図４に示すように、不織布４をロール１２から引き出しながらプリプレグ１を製造することが可能になるので、プリプレグの生産性が阻害されることがない。   Furthermore, by orienting the long fibers 4a of the nonwoven fabric 4 in the orientation direction of the reinforcing fibers 2, it becomes possible to manufacture the prepreg 1 while pulling the nonwoven fabric 4 from the roll 12, as shown in FIG. Productivity is not hindered.

本発明は、上記実施形態では、不織布４として、長繊維４ａを一方向に配向したものを挙げたが、それに加えて、更に熱可塑性樹脂製の長繊維を長繊維４ａと略直交する方向（補強繊維２ａの配向方向と略直交する方向）に配向（延在）するようにした不織布であってもよい。その場合、不織布の目付は、長繊維４ａについて少なくとも３ｇ／ｍ２確保し、合計で３０ｇ／ｍ２以下とする。また、上記した比率は、長繊維４ａと略直交する方向に延在する熱可塑性樹脂製の長繊維も含めた比率である。なお、ここで言う略直交するとは、直交する方向に対して±５度の角度範囲を言う。 In the above embodiment, the non-woven fabric 4 in the present invention is one in which the long fibers 4a are oriented in one direction. However, in addition to this, the long fibers made of a thermoplastic resin are substantially orthogonal to the long fibers 4a ( The nonwoven fabric may be oriented (extended) in a direction substantially orthogonal to the orientation direction of the reinforcing fibers 2a. In that case, the basis weight of the nonwoven fabric is at least 3 g / m 2 to ensure the long fibers 4a, it shall be the 30 g / m 2 or less in total. Moreover, the above-mentioned ratio is a ratio including long fibers made of a thermoplastic resin extending in a direction substantially orthogonal to the long fibers 4a. Note that “substantially orthogonal” here means an angle range of ± 5 degrees with respect to the orthogonal direction.

また、上述したプリプレグ１は、補強基材２として一方向に引き揃えた補強繊維２ａからなる例を挙げたが、それに限定されず、織物からなる補強基材２を用いたものであってもよい。   Moreover, although the prepreg 1 mentioned above gave the example which consists of the reinforcement fiber 2a arranged in one direction as the reinforcement base material 2, it was not limited to it, Even if it used the reinforcement base material 2 which consists of textiles Good.

表１に示す補強繊維とマトリックス樹脂及び配向性の不織布（ポリエステル使用）を用いたプリプレグを２４層（補強繊維を４５°ずつずらして積層した４層のプリプレグ×６）積層し、温度１８０℃、６気圧の条件下で２時間硬化させた繊維補強複合材料（実施例１〜５）と不織布がない繊維補強複合材料（比較例）をそれぞれ作製した。不織布の目付、補強繊維の配向方向に対して５度以下で延在する長繊維の比率、プリプレグ全重量に対する熱硬化性マトリックス樹脂と不織布の重量の総和比率は表１に示す通りである。   24 layers of prepregs using reinforcing fibers, matrix resin and oriented non-woven fabric (using polyester) shown in Table 1 (4 layers of prepregs laminated by shifting the reinforcing fibers by 45 ° by 6) were laminated at a temperature of 180 ° C., A fiber reinforced composite material (Examples 1 to 5) cured for 2 hours under a condition of 6 atm and a fiber reinforced composite material without a nonwoven fabric (Comparative Example) were prepared. Table 1 shows the basis weight of the nonwoven fabric, the ratio of long fibers extending at 5 degrees or less with respect to the orientation direction of the reinforcing fibers, and the total ratio of the weight of the thermosetting matrix resin and the nonwoven fabric to the total weight of the prepreg.

これら各繊維補強複合材料から試験片を切出し、２７０ｌｂ−ｉｎの衝撃付与後、圧縮強度を測定したところ、表１に示す結果を得た。本試験方法はＳＡＣＭＡ(Supplier of Advanced Composite Materials Association)ＳＲＭ２に準拠した。   A test piece was cut out from each of these fiber-reinforced composite materials, and after applying a 270 lb-in impact, the compressive strength was measured. The results shown in Table 1 were obtained. This test method conformed to SACMA (Supplier of Advanced Composite Materials Association) SRM2.

Figure 0004962329
Figure 0004962329

表１から、本発明は、不織布がない比較例より、衝撃後の圧縮強度が３００ＭＰａ前後と大幅に高く、高い耐衝撃性を確保できることがわかる。   From Table 1, it can be seen that the compression strength after impact of the present invention is significantly higher, around 300 MPa, and high impact resistance can be ensured, as compared with the comparative example having no nonwoven fabric.

本発明のプリプレグの一実施形態を示す断面説明図である。It is a section explanatory view showing one embodiment of the prepreg of the present invention. 図１の横断面を部分的に示す断面図である。It is sectional drawing which shows the cross section of FIG. 1 partially. 本発明のプリプレグの他の実施形態を示す断面説明図である。It is sectional explanatory drawing which shows other embodiment of the prepreg of this invention. 本発明の図１のプリプレグの製造方法の一例を示す説明図である。It is explanatory drawing which shows an example of the manufacturing method of the prepreg of FIG. 1 of this invention.

符号の説明Explanation of symbols

１ プリプレグ
２ 補強基材
２ａ 補強繊維
３ 樹脂層
３ａ 上面
３ｂ 下面
４ 不織布
４ａ 長繊維 DESCRIPTION OF SYMBOLS 1 Prepreg 2 Reinforcement base material 2a Reinforcing fiber 3 Resin layer 3a Upper surface 3b Lower surface 4 Nonwoven fabric 4a Long fiber

Claims (4)

強度３０００ＭＰａ以上の炭素繊維の長繊維からなる補強繊維を配向した補強基材を熱硬化性マトリックス樹脂中に埋設したプリプレグにおいて、該補強基材より少なくとも一方のプリプレグ表面側に熱可塑性樹脂製の長繊維を前記補強繊維の配向方向に配向した不織布を配置し、該不織布の長繊維が任意の位置で３０ｃｍの長さを取ることを許容する長さを有し、前記不織布において前記長繊維の任意の位置で３０ｃｍの長さを取ってその両端間を直線で結んだ時の直線の角度が前記補強繊維の配向方向に対して５度以下となるように延在する長繊維の比率を４０〜１００％とし、該不織布の目付を３〜３０ｇ／ｍ２とし、前記熱硬化性マトリックス樹脂と不織布の重量の総和が、プリプレグ全重量の３０〜６０重量％であるようにしたプリプレグ。 In a prepreg in which a reinforcing base material in which reinforcing fibers made of carbon fibers having a strength of 3000 MPa or more are oriented is embedded in a thermosetting matrix resin, a length made of a thermoplastic resin is provided on the surface side of at least one prepreg from the reinforcing base material. A non-woven fabric in which fibers are oriented in the orientation direction of the reinforcing fiber is disposed, and the non-woven fabric has a length that allows the long fibers of the non-woven fabric to take a length of 30 cm at an arbitrary position. The ratio of long fibers extending so that the angle of the straight line when taking a length of 30 cm at the position and connecting the both ends with a straight line is 5 degrees or less with respect to the orientation direction of the reinforcing fiber is 40 to as 100%, the basis weight of the nonwoven fabric and 3 to 30 g / m @ 2, the sum of the weight of the thermosetting matrix resin and nonwoven fabric, and as 30 to 60% by weight of the prepreg total weight flop Preg. 前記不織布の長繊維を構成する熱可塑性樹脂の主成分がポリエステルである請求項１に記載のプリプレグ。   The prepreg according to claim 1, wherein a main component of the thermoplastic resin constituting the long fibers of the nonwoven fabric is polyester. 前記熱硬化性マトリックス樹脂が２官能以上のエポキシ樹脂を主成分とする請求項１又は２に記載のプリプレグ。 The prepreg according to claim 1 or 2 , wherein the thermosetting matrix resin contains a bifunctional or higher functional epoxy resin as a main component. 請求項１，２又は３に記載のプリプレグを複数積層して硬化させてなる繊維補強複合材料。 A fiber-reinforced composite material obtained by laminating and curing a plurality of the prepregs according to claim 1 , 2 or 3 .
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