JP2005213469A - Reinforced fiber base material, preform and composite material and method of manufacturing the base material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base material having excellent handling properties and impregnating properties for matrix resins and giving composite materials having good mechanical characteristics, a method of manufacturing the base material, a preform obtained from the base material and a composite material obtained from the base material or the preform. <P>SOLUTION: The base material is used in composite materials formed by impregnating a laminated reinforced fiber base material with a matrix resin, is composed of at least a fabric made of a reinforcing fiber thread and a resin material and has a volume fraction V<SB>ff</SB>of the reinforced fiber, calculated from the thickness of the base material, of 30-60%. The adhering resin material meets the requirements: (1) to adhere at least to the surface of the fabric; (2) to adhere in such a way as to have continuous clearances periodically; and (3) to adhere through 2-20 wt.% of the base material. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a reinforcing fiber substrate, a preform and a composite material obtained therefrom, and a method for producing the reinforcing fiber substrate.

  TECHNICAL FIELD The present invention relates to a reinforcing fiber base material having excellent handling properties and a method for producing the same in forming a preform using the reinforcing fiber base material. This handleability means at least one of the form stability of the reinforcing fiber base and the tack when laminated.

  The present invention also relates to a reinforcing fiber substrate and a preform having an excellent resin impregnation property in molding of a composite material using a preform formed from a reinforcing fiber substrate having such an excellent handling property. .

  Furthermore, this invention relates to the composite material excellent in the mechanical characteristics formed from the reinforced fiber base material or preform which has such an excellent resin impregnation property. This mechanical property means at least the compressive strength after application of impact.

  Composite materials (FRP) using reinforcing fibers are used for aerospace and sports applications based on their mechanical properties and light weight. As a typical method for producing a composite material, there are an autoclave molding method and a vacuum molding method. In such a molding method, a prepreg in which a matrix resin is completely or partially impregnated in a woven fabric or the like is used. As this prepreg, for example, a laminate is proposed which is laminated and heated and pressurized in an autoclave or atmospheric pressure to form a composite material (see, for example, Patent Document 1). However, the prepreg has an advantage that a composite material having excellent mechanical properties can be obtained, but has a problem of low productivity (high cost).

  An injection molding method is known as a molding method of a composite material having excellent productivity. Examples of the injection molding method include a resin transfer molding method (RTM). In the injection molding method, a woven fabric or the like (dry substrate) that is not impregnated with a matrix resin is placed in a mold, and the matrix resin is impregnated into the substrate by injecting a low-viscosity liquid matrix resin. .

  However, the injection molding method is excellent in the productivity of composite materials, but the matrix resin needs to have a low viscosity. Therefore, the mechanical properties are higher than those of composite materials molded from high-viscosity matrix resins used in prepregs. There was an inferior problem.

  In response to such a problem, by a technique of arranging a thermoplastic resin layer having a gap between layers of a preform laminated with a reinforcing fiber base material, or a technique of applying a resin blended with an epoxy resin and thermoplastic resin particles on a fabric Techniques have been proposed for improving the mechanical properties (delamination resistance, delamination toughness, etc.) of composite materials obtained by injection molding (see, for example, Patent Documents 1 and 2 and Non-Patent Documents 1 and 2).

However, in the above proposal, the thermoplastic resin layer arranged to improve the mechanical properties, or a resin blended with an epoxy resin and thermoplastic resin particles causes a problem that the impregnation property of the matrix resin is significantly reduced. The problem of obtaining composite materials with high productivity, which is the original purpose, could not be achieved. That is, the reinforcing fiber base material and the preform that can achieve both the mechanical properties and the impregnation property of the matrix resin have not been achieved by the above proposal, and there is a strong demand for a technology that can satisfy both of these problems.
JP 2002-249605 A (Claim 1) International Patent Publication WO00 / 61363 (Claim 1) International Publication No. WO03 / 04758 (Claim 1) Journal of Advanced Materials, Volume32, No.3, July 2000, P27-34 Composites part A, Volume32,2001, P721-729

  The object of the present invention is to solve the problems of the background art, and it is not only excellent in handling properties such as form stability and tackiness, but also a composite material having high mechanical properties such as compressive strength after impact is obtained. And a method for producing the same, a preform obtained from the reinforcing fiber substrate, and a composite material obtained from the reinforcing fiber substrate or preform. There is to do.

In order to achieve the above object, the present invention employs the following configuration. That is,
(1) A reinforcing fiber base material used for a composite material formed by impregnating a laminated reinforcing fiber base material with a matrix resin, wherein the reinforcing fiber base material is composed of at least reinforcing fiber yarns and a resin The reinforcing fiber volume ratio V _{ff of the} reinforcing fiber base calculated from the thickness of the reinforcing fiber base is 30 to 60%, and the resin material to be bonded is the following requirements 1 to 3 Reinforcing fiber base material characterized by satisfying any of the above.

  [Requirement 1]: Adhering to at least the surface of the fabric.

  [Requirement 2]: Adhering in a form having continuous voids periodically.

  [Requirement 3]: Adhering at 2 to 20% by weight of the reinforcing fiber substrate.

  (2) The reinforcing fiber substrate according to (1), wherein the resin material is substantially bonded only to the surface of the substrate.

  (3) The reinforcing fiber substrate according to (1) or (2), wherein a main component of the resin material is a thermoplastic resin.

  (4) The reinforcing fiber substrate according to (3), wherein the thermoplastic resin is at least one selected from polyamide, polyetherimide, polyphenylene ether, polyether sulfone, and phenoxy.

  (5) The reinforcing fiber substrate according to any one of (1) to (4), wherein the resin material is bonded with an area coverage of more than 5% and less than 70%.

  (6) The reinforcing fiber substrate according to any one of (1) to (5), wherein the resin material is bonded in a stripe form or a tile form.

  (7) The resin material is bonded in a form having continuous voids periodically, and the period of the continuous voids is 150 mm or less. The reinforced fiber base material in any one.

(8) The above-mentioned (1) to (4), wherein the reinforcing fiber substrate is a unidirectional woven fabric or a unidirectional sheet, and the basis weight of the reinforcing fiber yarn is 50 to 500 g / m ^2. The reinforcing fiber substrate according to any one of claims 1 to 7.

(9) The above-mentioned (1) to (7), wherein the reinforcing fiber substrate is a bi-directional woven fabric or a multidirectional sheet, and the basis weight of the reinforcing fiber yarn is 100 to 1000 g / m ^2. The reinforcing fiber substrate according to any one of the above.

  (10) The reinforcing fiber substrate according to any one of (1) to (9), wherein the gap is located at least between the reinforcing fiber yarns in the fabric.

  (11) The reinforcing fiber base material according to any one of (1) to (10), wherein the void portion is continuously located between the reinforcing fiber yarns in the fabric.

  (12) In any one of the above (1) to (11), the resin material is bonded in a continuous or discontinuous form in a filling portion other than a continuous void portion. Reinforced fiber substrate.

  (13) The reinforcing fiber substrate according to (12), wherein the resin material in the discontinuous form is a spot having an average diameter of 5 mm or less.

  (14) The reinforcing fiber substrate according to any one of (1) to (13), wherein an average thickness in a filling portion other than the continuous void portion of the resin material is 2 to 100 μm.

  (15) The reinforcing fiber base according to any one of (1) to (14) is a laminate of two or more layers, and the reinforcing fiber bases are at least partially made of the resin material. A preform characterized by being bonded and integrated.

  (16) A composite material obtained by impregnating the reinforcing fiber substrate according to any one of (1) to (14) or the preform according to (15) with a matrix resin.

(17) A method for producing a reinforcing fiber base material used for a composite material that is formed by impregnating a matrix resin and then molding the laminated reinforcing fiber base material, (A) constituting a fabric using at least reinforcing fiber yarns, (B) Using the resin material of 2 to 20% by weight of the reinforcing fiber base material, the base material calculated from the base material thickness in the form having periodic continuous voids at least on the surface of the fabric. A method for producing a reinforcing fiber base material, wherein the reinforcing fiber volume fraction V _ff is adhered to 30 to 60%.

  (18) The means for adhering the resin material is one that masks the surface of the substrate and applies the resin material, or one that transfers or bonds a film-like resin material to the surface of the substrate. The manufacturing method of the reinforced fiber base material as described in said (17).

In the reinforcing fiber base according to the present invention, the resin material which is a constituent element thereof adheres to at least the surface of the fabric (Requirement 1) at 2 to 20% by weight (Requirement 3) of the reinforcing fiber base, Since the V _{ff of the} material is 30 to 60%, it is possible to obtain a composite material that is excellent in handling properties such as form stability and tackiness and has high mechanical properties such as compressive strength after impact application. In addition, since the resin material is bonded in a form (requirement 2) having periodic voids periodically, excellent impregnation of the matrix resin can be achieved.

  In the preform according to the present invention, the reinforcing fiber bases are at least partially bonded and integrated with each other by the resin material, so that the handling property is excellent and the excellent productivity of the composite material can be achieved. It is.

  Since the composite material according to the present invention uses the reinforcing fiber substrate or the preform, high mechanical properties can be achieved.

  The method for producing a reinforced fiber base material according to the present invention is produced so as to satisfy the requirements of the above reinforced fiber base material, so that a composite material having excellent handleability and high mechanical properties can be obtained, and the impregnation property of a matrix resin Can be achieved.

The reinforcing fiber substrate of the present invention is a reinforcing fiber substrate used for a composite material formed by impregnating a laminated reinforcing fiber substrate with a matrix resin, and the substrate is composed of at least reinforcing fiber yarns. Resin material which is composed of a fabric and a resin material, has a reinforcing fiber volume fraction V _ff of 30-60% calculated from the thickness of the reinforcing fiber substrate (JIS R7602), and is bonded thereto. Satisfies all of the following requirements 1-3.

  [Requirement 1]: Adhering to at least the surface of the fabric.

  [Requirement 2]: Adhering in a form having continuous voids periodically.

  [Requirement 3]: Adhering at 2 to 20% by weight of the reinforcing fiber substrate.

  There is an injection molding method as a method of molding the laminated reinforcing fiber base material by impregnating a matrix resin. Examples of the injection molding method include a resin transfer molding method (RTM), a vacuum assist resin transfer molding method (VaRTM), and a resin film infusion molding method (RFI). The reinforcing fiber substrate of the present invention is used for a composite material molded by such a molding method.

In the reinforcing fiber base of the present invention, the resin material which is a constituent element thereof adheres to [Requirement 1] at least the surface of the fabric at [Requirement 3] 2 to 20% by weight of the reinforcing fiber base. The V _ff of the resin satisfies all the requirements of 30 to 60%, so that it is excellent in handling of the substrate represented by the form stability and tackiness, and has high mechanical properties represented by the compressive strength after impact application. It is possible to obtain a composite material having In addition, since the resin material is bonded in a form having [Requirement 2] continuous voids periodically, excellent impregnation of the matrix resin can be achieved. Hereinafter, each requirement will be described in detail.

[Requirement 1]:
The resin material is bonded to at least the surface of the fabric. The resin material may be present inside the fabric, i.e. between the reinforcing fiber yarns or between the filaments in the reinforcing fiber yarns, or more on the surface of the fabric than inside the substrate, i.e. It may be unevenly distributed and bonded. The uneven distribution refers to a form in which 70% by volume or more, preferably 90% by volume or more of the resin material is present on the surface of the substrate. A more preferable form is a form in which only substantially the surface of the substrate is adhered, that is, a form in which 95% by volume or more of the resin material exists on the surface of the substrate. The volume% of the resin material is calculated from the area ratio by observing the cross section of the reinforcing fiber base with a scanning electron microscope, discriminating the resin material in the square with the thickness of the reinforcing fiber base as one side. The value to be used was an average value calculated from three arbitrarily selected squares.

  If it is not adhered to the surface of the fabric, the tackiness (adhesiveness) between the substrates when the reinforcing fiber substrates are laminated to obtain a preform cannot be expressed. Further, misalignment of the reinforcing fiber yarn in the fabric is likely to occur, and the substrate has poor shape stability. As a result, it is not possible to obtain a reinforcing fiber base material excellent in handleability.

  In terms of mechanical properties, at least when not bonded to the surface of the fabric, the compression strength after compression of the composite material having a pseudo-isotropic laminated structure formed by laminating a plurality of sheets (Compression After Impact, (Hereinafter abbreviated as CAI). Such CAI is a mechanical property that is very important when a composite material is used as a structural member (particularly a primary structural member) of a transport device (particularly an aircraft), and has a high CAI when applied to a structural member. The necessity to have is high.

  The resin material used in the present invention plays a role of a crack stopper and a role of relaxation of residual stress during molding of the composite material in a composite material obtained by laminating reinforcing fiber base materials. In particular, when the composite material receives an impact, it plays a role of suppressing damage between the base material layers, and provides excellent mechanical properties (particularly CAI), that is, an effect of increasing toughness.

  In addition to the toughening effect, at least when the resin material adheres to the surface of the fabric, when the base material is laminated, the resin material adhering to the fabric surface becomes a spacer, and the interlayer between adjacent base materials To form a space. This is called the spacer effect by the resin material. This spacer effect serves to form a flow path of the matrix resin when the composite material is molded by being injected into the base material on which the matrix resin is laminated. This not only facilitates the impregnation of the matrix resin into the substrate, but also increases the impregnation rate, leading to excellent productivity of the composite material.

  The spacer effect also plays a role of concentrating the toughening effect of the resin material between the base materials of the composite material. As a result, an even higher toughening effect is brought about. This is referred to as an interlayer strengthening effect by the resin material.

  The toughening effect, spacer effect, and interlayer strengthening effect by the resin material are even higher when the resin material is unevenly distributed on the surface of the base material, particularly when the resin material is substantially only on the surface of the fabric. Demonstrated at level.

  In the reinforcing fiber base single layer, the resin material may be unevenly distributed on one surface, or may be unevenly distributed on both surfaces. When manufacturing a reinforced fiber base material at lower cost, the former is preferable. The latter is preferred when you do not want to use the front and back of the reinforcing fiber base properly. In multi-layers of reinforcing fiber substrates, the resin material is placed between each layer of the laminate when only the substrate located in the center layer of the laminate is adhered to both sides, and the other layers are adhered to only one side. Therefore, it can be said to be one of the preferred embodiments of the present invention.

[Requirement 2]:
The resin material is bonded in a form having periodic void portions. Like the form which concerns, the space | gap part is continuing periodically, The outstanding impregnation property can be achieved. In the case where the resin material does not have continuous voids and covers and covers the entire fabric, it impedes the impregnation of the laminated reinforcing fiber base material in the thickness direction of the matrix resin. Further, simply providing a void in the resin material only secures a flow path in the thickness direction of the substrate.

  However, in the present invention, by continuously forming the gaps periodically, a flow path of the matrix resin in the planar direction (in the direction of the interlayer in the laminated body in which the base materials are laminated) can be formed. It can be made more efficient.

  As the form of the continuous void portion, for example, a tile shape in which the void portion and the filling portion other than the void portion are continuous only in one direction, the void portion is continuous in a mesh shape, and the filling portion is a discrete tile. The form can be mentioned. Note that the mesh form in which the gaps are discrete and the filling part is continuous in a mesh form cannot continuously form the flow path of the matrix resin in the planar direction, and thus does not solve the problem of the present invention.

  The term “periodic” as used in the present invention means having translational symmetry in at least one direction. It is preferable that the period is 150 mm or less because not only the manufacturing process can be simplified, but also design and management can be facilitated and the impregnation property can be stabilized. More preferably, it is 100 mm or less, More preferably, it is 50 mm or less. Moreover, it is preferable that the period concerned is 2 mm or more. If it is less than 2 mm, the production process of the reinforcing fiber base becomes complicated, and it becomes difficult to produce it at low cost. More preferably, it is 5 mm or more, More preferably, it is 10 mm or more.

  Here, the translational symmetry refers to the regularity of a structure in which a predetermined pattern is repeatedly arranged, and the rotational symmetry that the whole matches when the whole is turned by a predetermined angle, and the right and left of a certain plane are It also has mirror symmetry that is the relationship of the image reflected in the mirror.

  Such a resin material preferably has an area coverage of more than 5% and less than 70%. If it is 70% or more, the resin flow path in the thickness direction may be insufficient. Further, if it is 5% or less, the above-mentioned toughening effect, spacer effect, and interlayer strengthening effect are hardly exhibited.

The area coverage refers to the percentage of the portion where the resin material in the substrate is present (covered) in a unit area of 100 mm × 100 mm when the substrate is viewed from the plane direction,
Area coverage (%) = total area (mm ² ) / 10,000 of the portion where the resin material exists
Is calculated by The measurement is performed at least five times at an arbitrary position of the substrate, and an average value of the measured values is used. The total area of the portion where the resin material exists can be calculated by performing image processing based on an image optically captured by a CCD camera, a scanner, or the like.

  In the following, the present invention will be described more specifically with reference to the drawings.

  FIG. 1 is a schematic plan view showing one embodiment of a stripe form of a resin material in a reinforcing fiber base of the present invention. FIG. 2 is a schematic plan view showing an aspect of a tile form of a resin material. FIG. 3 is a schematic plan view showing another aspect of the tile form of the resin material. FIG. 4 is a schematic plan view showing another aspect of the stripe form of the resin material.

  In FIG. 1, the reinforcing fiber base is composed of a fabric (not shown) and a resin material 10 bonded to the fabric. The resin material 10 has a stripe shape, the resin material does not exist in the continuous gap portion 11, and the resin material exists in the filling portion 12 other than the continuous gap portion. It can be said that the period of the resin material is a distance a (the weft direction in FIG. 1).

  Similarly in FIG. 2 (FIG. 3), the resin material 20 (30) has a tile shape, and there is no resin material in the continuous gap portion 21 (31), and the filling portion 22 other than the continuous gap portion. Resin material exists in (32). The vertical direction of the resin material in FIG. 2 (FIG. 3) is b (d), and the horizontal direction in FIG. 2 (FIG. 3) is the distance c (e).

  In FIG. 4, the reinforcing fiber substrate has a stripe shape in which the resin material 40 has a stripe shape, and there is no resin material in the continuous void portion 41, and the dotted resin material 43 in the filling portion 42 other than the continuous void portion. Is present. The form in which the resin material in the filling portion 42 is scattered and adhered to the fabric surface can also be described as follows. That is, when the filling part 42 is the sea and the dotted resin material 43 is an island, the state of the resin material existing on the fabric surface in the filling part 42 can be said to be a large number of small island groups scattered in the sea. The maximum width of the small island is smaller than the width of the filling portion 42. Although not illustrated in FIG. 4, if the filling portion 42 is the sea and the point-like resin material 43 is an island, even if the island has a lake, the islands are mixed. Also good.

  The resin material 40 is scattered in the filling surface 42 in the form of scattered dots (FIG. 4), or is bonded in a discontinuous shape such as a dotted shape or a short fiber shape. Alternatively, as shown in FIGS. 1 to 3, the filling portions 12, 22, and 32 are bonded in a continuous form such as a film form or a continuous fiber form (not shown). May be.

  When the resin material is in a form in which the resin material is continuously bonded in the filling portion other than the continuous void portion, it not only easily exhibits the desired compressive strength after application of impact, but also has excellent quality stability. In other words, the form of continuous bonding is preferable from the standpoint of mechanical characteristics and stability.

  When the resin material is in a form in which the resin material is bonded discontinuously in the filling portion other than the continuous void portion, a microscopic fine void portion can be formed, and the impregnation property can be further improved. That is, it is preferable to discontinuously adhere from the impregnation surface.

  When bonded to such a point, the average diameter of the points (islands) from the plane direction of the base material (average short diameter in the case of an ellipse) can be uniformly dispersed on the fabric surface. Therefore, 5 mm or less is preferable, 1 mm or less is more preferable, and 400 μm or less is more preferable. The average diameter of the points (islands) is preferably 30 μm or more. If the thickness is less than 30 μm, the production process may be restricted, and it may be difficult to produce the reinforcing fiber base by an inexpensive process. More preferably, it is 50 micrometers or more, More preferably, it is 80 micrometers or more.

  In addition, the resin material in the filling portion is arranged in contact with the resin material when the unevenness in the thickness direction of the resin material is too large when a plurality of reinforcing fiber base materials are laminated regardless of the above-described continuous or discontinuous shape. Adjacent reinforcing fiber substrate is bent. This bending may impair the mechanical properties of the composite material. On the other hand, if the resin material is too thin, it is difficult to obtain a desired compressive strength after application of impact. From such a viewpoint, the average thickness of the resin material in the filling portion is preferably 2 to 100 μm. More preferably, it is 5-50 micrometers, More preferably, it is 8-30 micrometers. The flat air thickness refers to an average value of thicknesses at arbitrary 10 locations of the resin material by observing a cross section of the reinforcing fiber base with a scanning electron microscope (SEM). When observation by SEM is difficult, the reinforcing fiber base material is impregnated with a liquid room temperature curable epoxy resin, cured at room temperature, and the cross-section polished is observed with an optical microscope. Use the average value instead.

  FIG. 5 is a schematic plan view showing one embodiment of the resin material in the reinforcing fiber base. FIG. 6 is a schematic plan view showing another aspect of the resin material.

  In FIG. 5, the reinforcing fiber base is composed of a fabric (not shown) and a resin material 50 bonded to the fabric. The resin material 50 has no continuous void portion, the void portion 51 is discontinuous, and the resin material of the filling portion 52 other than the void portion is continuous. Since the gap 51 is not continuous, the effect of the present invention cannot be efficiently achieved.

  In FIG. 6, the resin material 60 has no periodically continuous voids. In other words, it can be said that everything is a filling part. In such a filling portion, the dot-like resin material 63 is bonded randomly rather than periodically. Since the voids are not periodic, the effects of the present invention cannot be efficiently achieved.

[Requirement 3]:
The resin material is bonded at 2 to 20% by weight of the reinforcing fiber substrate. By being in such a range, the tackiness of the substrate and the form stability of the substrate are brought about. As a result, it is possible to obtain a reinforced fiber base material having excellent handleability. The above-described toughening effect, spacer effect, and interlayer strengthening effect are most effectively expressed in amounts within such ranges. More preferably, it is 5-18 weight%, More preferably, it is 8-16 weight%.

When the resin material is less than 2% by weight, the form stability of the base material, the handling property of the reinforcing fiber base material such as tackiness when laminated, etc. are inferior, and the mechanical properties, particularly the effect of improving the compressive strength after impact is applied. Is also small. On the other hand, if it exceeds 20% by weight, a composite material excellent in mechanical properties of the composite material, particularly 0 ° compressive strength, cannot be obtained, and the reinforcing fiber volume fraction V _{f of the} composite material becomes too low. May interfere.

The reinforcing fiber base material of the present invention has a reinforcing fiber volume fraction V _ff of 30 to 60% calculated from the base material thickness. The base material thickness is measured according to JIS R7602. More preferably, it is 35-58%, Most preferably, it is 40-56%.

When the reinforcing fiber volume fraction V _ff is less than 30%, in particular, in the injection molding in which the matrix resin is impregnated by the vacuum pressure, no pressure higher than the atmospheric pressure is applied, so the volume of the base material, that is, the reinforcing fiber volume fraction V _ff is desired. The reinforcing fiber volume fraction V _f of the resulting composite material cannot be controlled to 50 to 65% suitable for the mechanical properties, and a composite material having a desired thickness dimension cannot be obtained. Furthermore, the base material layer in the obtained composite material is swelled, and the mechanical properties of the resulting composite material, particularly the compressive strength, are significantly reduced. The problem is that when the layered structure is oblique with respect to the layered structure, only one of the male mold and the female mold is used for molding and a flexible bag material is used for the other. Especially manifest. That is, it is not possible to obtain a composite material that has excellent mechanical properties and exhibits a high weight reduction effect.

  On the other hand, if it exceeds 60%, in the case of injection molding, the reinforcing fibers that are packed too tightly impede the flow of the matrix resin. I can't get it.

By controlling the reinforcing fiber volume fraction V _ff within the range of 30 to 60%, the reinforcing fiber volume fraction V _ff and dimensions in the resulting composite material are strictly controlled within a desired range, and high mechanical properties are exhibited. It becomes possible to do.

The reinforcing fiber volume fraction V _ff calculated from the thickness of the reinforcing fiber substrate in the present invention (JIS R7602) refers to a value obtained by the following formula (unit:%). The symbols used here are as follows. Here, the base material used for the measurement is one that has been at least 24 hours after manufacturing and has a substantially saturated springback amount.

V _ff = W / (ρ × Tf × 10) (%)
W: Weight of reinforcing fiber per 1 m ² of reinforcing fiber substrate (g / m ² )
ρ: Density of reinforcing fiber (g / cm ³ )
Tf: Reinforced fiber base material thickness measured in accordance with JIS R7602 (mm)
The fabric constituting the reinforcing fiber base of the present invention is formed using reinforcing fiber yarns. Various types of fabrics can be used. For example, woven fabrics (unidirectional, bi-directional, three-dimensional woven fabrics, etc.) such as plain weave, twill or satin weave, knitted fabrics, braids, unidirectional sheets in which reinforcing fiber yarns are aligned in one direction, Examples thereof include a multidirectional sheet in which two or more layers of unidirectional sheets having different directions are stacked and integrated. The base material may be obtained by integrating a plurality of base materials by various joining means such as stitch yarns, knot yarns, resin materials and the like.

  In particular, when the composite material is used as a structural member for transportation equipment or the like, the substrate is required to have very high mechanical properties (particularly 0 ° compressive strength). Therefore, in order to obtain higher mechanical properties, the substrate is preferably in the form of a unidirectional woven fabric or a unidirectional sheet that does not cause warp and weft crimps, such as a bi-directional woven fabric. In view of the impregnation property of the matrix resin, it is more preferable to have a gap between the reinforcing fiber yarns, and examples thereof include a unidirectional non-crimp fabric. Such unidirectional non-crimp fabrics are described in detail in, for example, Japanese Patent No. 3279049 and Japanese Patent Application Laid-Open No. 2003-82117.

  Moreover, when the above-mentioned continuous periodic voids are located at least between the reinforcing fiber yarns in the fabric (in some cases, a gap), the impregnation property can be further enhanced. Reinforcing fiber yarns can be regarded as substantially elliptical, and when they are arranged in at least one direction, there is a gap between them, both in the thickness direction and in the planar direction, that is, the resin. It has a form that tends to be a flow path. When the gap is located at least at the location (between the reinforcing fiber yarns in the fabric), it can be efficiently used as a resin flow channel in the thickness direction, but also in the planar direction (a laminate in which base materials are laminated) It is also possible to efficiently use the resin flow path in the direction of the interlayer), and the impregnation can be made much more efficient. From this point of view, it can be said that the gap portion is continuously located between the reinforcing fiber yarns in the fabric so that the effect of the present invention is maximized.

When the reinforcing fiber base material is a unidirectional woven fabric or a unidirectional sheet, each reinforcing fiber base material layer can be laminated at an arbitrary angle. Therefore, the reinforcing fiber base material is a preferable fabric form from the viewpoint of freedom of strength design of the composite material. be able to. In the case of such a reinforcing fiber substrate, the basis weight of the reinforcing fiber yarn of the reinforcing fiber substrate is preferably 50 to 500 g / m ² from the viewpoints of impregnation properties and mechanical properties of the composite material. More preferably 100~350g / m ^2, further preferably 150 to 250 g / m ^2.

On the other hand, when a bi-directional woven fabric and a multi-directional sheet (in particular, a multi-axis sheet integrated with stitch yarns) can be used, the labor of lamination can be reduced, so that it can be said to be a preferable fabric form from the viewpoint of cost reduction. . In the case of such a reinforced fiber base material, the basis weight of the reinforced fiber yarn of the reinforced fiber base material is preferably 100 to 1000 g / m ² from the viewpoint of impregnation properties and mechanical properties of the composite material. More preferably from 200 to 800 g / m ^2, and still more preferably from 300 to 600 g / m ^2. The reason why the fabric weight of the bi-directional fabric or multi-directional sheet may be larger than the fabric weight of the unidirectional fabric is that the meaning of the bi-directional or multi-directional fabric is diminished if the fabric weight of the reinforcing fiber yarn is small. Because.

  The type of reinforcing fiber yarn used in the present invention is not particularly limited, and examples thereof include carbon fiber, glass fiber, organic fiber (for example, aramid fiber, polyparaphenylene benzobisoxazole fiber, polyethylene fiber, polyvinyl alcohol fiber, etc. ), Metal fibers or ceramic fibers, or combinations thereof. Among these, carbon fibers are preferably used as reinforcing fiber yarns for structural members of aircraft and automobiles that have high strength requirements because they are excellent in specific strength and specific elastic modulus and excellent in water absorption resistance.

  The reinforcing fiber yarn used in the present invention is preferably a substantially continuous filament. When the filament is continuous, higher mechanical properties can be expressed. The term “substantially continuous” includes continuous filaments, and a very small number of these continuous filaments may break in the formation of the substrate, and thus includes such broken filaments. The reinforcing fiber yarn may be discontinuous (for example, spun yarn). When the fiber length is 3 mm or more, the reinforcing effect can be exhibited to some extent.

  The resin material used in the present invention is not particularly limited as long as it improves the handleability of the reinforcing fiber base and improves the mechanical properties of the composite material. As the resin material, a thermosetting resin and / or a thermoplastic resin can be appropriately selected and used.

  When a thermosetting resin is used as the main component of the resin material, it is preferably at least one selected from epoxy, unsaturated polyester, vinyl ester, phenol, and bismaleimide, and of these, epoxy is particularly preferable. When epoxy is used, not only the adhesiveness and tackiness of the base material are excellent because of high adhesiveness, but also high mechanical properties can be exhibited particularly when an epoxy resin is used as the matrix resin.

  When epoxy is the main component, a curing agent, a curing catalyst, or the like may or may not be included, but the latter is preferable from the viewpoint of the life of the resin material. Even in the former case, there is no particular problem as long as the curing agent or curing catalyst has high potential.

  When a thermoplastic resin is used as the main component of the resin material, it is preferably at least one selected from polyamide, polysulfone, polyethersulfone, polyetherimide, polyphenylene ether, polyimide, polyamideimide, and phenoxy. Of these, polyamide, polyetherimide, polyphenylene ether, polyether sulfone, and phenoxy are particularly preferable.

  Such a thermoplastic resin is a main component of the resin material, and its blending amount is preferably 70 to 100% by weight. The blending amount is more preferably 75 to 97% by weight, and still more preferably 80 to 95% by weight. If the blending amount is less than 70% by weight, it may be difficult to obtain a composite material excellent in CAI.

  However, when a thermoplastic resin is the main component, the adhesiveness and tackiness of the resin material to the substrate may be inferior. In this case, it is preferable to add a small amount of a tackifier, a plasticizer, etc. as subcomponents to the resin material. It is preferable to contain a thermosetting resin as such a subcomponent, and those mentioned in the above examples can be used. Of these, epoxy is preferable.

  The resin material used in the present invention preferably has a glass transition point of 50 to 300 ° C. from the viewpoint of the temperature at which tack develops (processing temperature). More preferably, it is 60-250 degreeC, More preferably, it is 80-180 degreeC. The glass transition point is measured by a differential scanning calorimeter (DSC) at a heating rate of 20 ° C./min in an absolutely dry state.

The method for producing a reinforced fiber base material of the present invention is a method for producing a reinforced fiber base material used for a composite material that is formed by impregnating a matrix resin and then molding the reinforced fiber base material, and (A) at least a reinforced fiber yarn. A fabric is formed using strips, and (B) 2 to 20% by weight of the resin material of the reinforcing fiber base material is formed from the thickness of the base material in a form having periodic continuous voids at least on the surface of the cloth. Bonding is performed so that the calculated reinforcing fiber volume fraction _Vff of the base material is 30 to 60%.

  In (B), when the resin material is bonded by means of masking the cloth surface and applying the resin material, or transferring or bonding the film-like resin material to the cloth surface, the manufacturing process is simplified. It can be said that this is a preferable means because it can accurately control a continuous periodic gap.

  Examples of the form of the resin material to be applied include a molten resin, a particulate or short fiber resin, and the like. Examples of the application method include melt blow in the case of a melted resin, spraying in the case of a particulate or short fiber resin, spraying by dropping its own weight, and the like.

  In addition, examples of the form of the resin material to be transferred or bonded include sheet-like forms such as a film, a nonwoven fabric, and a mat, and they may be formed on a support such as a release paper or a plastic film. Examples of the transfer or bonding method include various coatings such as a screen, a kiss roll, a press roll, and a flat plate press, and a pressing method.

  The preform according to the present invention is obtained by laminating two or more layers of the above-mentioned reinforcing fiber base material, and the reinforcing fiber base materials are at least partially bonded and integrated by the resin material. Is. When such adhesion extends over the entire surface of the reinforcing fiber substrate, the handleability of the preform may be inferior or impregnation of the matrix resin may be hindered. Such adhesion may be performed to such an extent that it can be handled as a preform in which a plurality of laminated reinforcing fiber substrates are integrated, and a substrate in which the substrates are partially bonded can be said to be a preferable embodiment.

Further, the reinforcing fiber volume fraction V _pf of the preform which is calculated from the preform thickness is preferably 40 to 65%. When the reinforcing fiber volume fraction V _pf is less than 40%, as described above, the bulk of the preform, that is, the reinforcing fiber volume fraction V _pf cannot be controlled in a desired range, and the reinforcing fiber volume fraction V _{f of the} resulting composite material Not only can be controlled within the range of 50-65%, which is suitable for mechanical properties, but also a composite material with a desired thickness cannot be obtained. On the other hand, if it exceeds 65%, in the case of injection molding, the reinforcing fibers that are packed too tightly impede the flow of the matrix resin, resulting in poor impregnation and only a composite material having an unimpregnated portion (void). I can't get it.

In addition, the reinforcing fiber volume fraction V _pf calculated from the thickness of the reinforcing fiber base in the present invention refers to a value obtained by the following formula (unit:%). The symbols used here are as follows. Here, the preform used for the measurement is a preform that has been produced for at least 24 hours and the springback amount is substantially saturated.

V _pf = (W × pl) / (ρ × Tp × 10) (%)
W: Weight of reinforcing fiber per 1 m ² of reinforcing fiber substrate (g / m ² )
pl: Number of laminated reinforcing fiber substrates (sheets)
ρ: Density of reinforcing fiber (g / cm ³ )
Tp: Preform thickness (mm)
The composite material according to the present invention is obtained by impregnating a matrix resin into the reinforcing fiber base material or the preform and solidifying it.

  The matrix resin is not particularly limited as long as it solves the problems of the present invention, as in the case of the resin material, but is preferably a thermosetting resin in terms of moldability and mechanical properties. However, the difference from the resin material is that when it is used for molding, it is liquid at the injection temperature.

  The thermosetting resin that is the matrix resin is preferably at least one selected from epoxy, phenol, vinyl ester, unsaturated polyester, cyanate ester, and bismaleimide because the problems of the present invention can be easily solved. Furthermore, a resin to which an elastomer, rubber, curing agent, curing accelerator, catalyst, or the like is added can also be used. Among them, for example, an epoxy is preferable for achieving very high mechanical properties (particularly CAI) required for an aircraft structural member, and bismaleimide is preferable for achieving high heat resistance, and epoxy is particularly preferable. .

  Since the matrix resin and the resin material have different roles, it is better to use at least a part of them that is different. That is, as a matrix resin, a resin with excellent impregnation properties (low resin viscosity and long gelation time) and excellent mechanical properties, and as a resin material, improved handling properties of the base material and imparting high mechanical properties It is preferable to select and use the resin to be used (the resin viscosity may be high). Of course, the resin material and the matrix resin are not limited to having a component common to some of the components, and may be preferable from the viewpoint of compatibility between the two.

  When the matrix resin is impregnated by the injection molding described later, since the impregnation is easy when the viscosity is low, the molding cycle can be shortened. This viscosity is preferably 400 mPa · s or less, more preferably 200 mPa · s or less, at the injection temperature. The injection temperature is preferably 100 ° C. or lower because the equipment can be simplified.

  The composite material can be molded by, for example, various molding methods such as injection molding (RTM, VaRTM, RFI, RIM, etc.) and press molding, and molding methods combining them. Among them, an injection molding method with high productivity can be mentioned.

  An example of such an injection molding method is RTM. RTM is a molding method in which a matrix resin is pressurized and injected into a cavity formed by a male mold and a female mold. In this case, it is preferable to inject the cavity while reducing the pressure.

  Another preferred molding method is VaRTM. VaRTM is a molding method in which a cavity formed by either a male mold or a female mold and a bag material such as a film (for example, nylon film, silicon rubber, etc.) is decompressed and a resin is injected at atmospheric pressure. is there. In this case, it is preferable to dispose the resin diffusion medium (media) on or in the reinforcing fiber substrate or preform in the cavity to promote resin impregnation and separate the media from the composite material after molding. These molding methods are preferably used from the viewpoint of molding cost.

  The use of the composite material according to the present invention is not particularly limited. Since this composite material has excellent mechanical properties (especially CAI), the primary structural member, the secondary structural member, the exterior member, the interior member, or their parts, particularly in transportation equipment such as aircraft, automobiles, ships, etc. When used inside, the effect is maximized.

  Hereinafter, the present invention will be described in more detail with reference to examples. The raw materials used in the examples and comparative examples are as follows.

  Reinforcing fiber yarn: PAN-based carbon fiber, number of filaments: 24,000, fineness: 1,030 tex, tensile strength: 5830 MPa, tensile modulus: 294 GPa.

  Glass fiber yarn: ECE225 1/0 1.0Z, fineness: 22.5 tex, binder: “DP” (manufactured by Nittobo Co., Ltd.).

  Polyamide 66 fiber yarn: Fineness: 1.7 tex, Filament number: 7.

Resin material: 60% by weight (main component) of polyethersulfone resin (Sumitomo Chemical Co., Ltd. Sumika Excel 5003P) and 40% by weight (subcomponent) of the following epoxy resin composition are melt kneaded in a twin screw extruder. Frozen and crushed. Average particle size D ₅₀ (measured with LMS-24 manufactured by Seishin Co., Ltd.) 115 μm, glass transition point 68 ° C.

  Epoxy resin composition—21 parts by weight of “Epicoat” 806 manufactured by Japan Epoxy Resin Co., Ltd., 12.5 parts by weight of NC-3000 manufactured by Nippon Kayaku Co., Ltd., and TEPIC-P manufactured by Nissan Chemical Industries, Ltd. 4 parts by weight were stirred at 100 ° C. until uniform.

  Matrix resin: An epoxy resin composition obtained by adding 39 parts by weight of the next curing liquid to 100 parts by weight of the next main liquid and stirring uniformly at 80 ° C. Viscosity with an E-type viscometer at 80 ° C .: 55 mPa · s, glass transition point after curing at 180 ° C. for 2 hours: 197 ° C., flexural modulus: 3.3 GPa.

  As main liquid-epoxy, 40 parts by weight of “Araldite” MY-721 manufactured by Vantico Co., Ltd., 35 parts by weight of “Epicoat” 825 manufactured by Japan Epoxy Resin Co., Ltd., and 15 parts by weight of GAN manufactured by Nippon Kayaku Co., Ltd. , And Japan Epoxy Resin Co., Ltd. "Epicoat" 630100 parts by weight, stirred at 70 ° C for 1 hour for uniform dissolution.

  As curing solution-polyamine, 70 parts by weight of “Epicure” W manufactured by Japan Epoxy Resin Co., Ltd., 20 parts by weight of 3,3′-diaminodiphenylsulfone manufactured by Mitsui Chemicals Fine Co., Ltd., and Sumitomo Chemical Co., Ltd. 10 parts by weight of “SumiCure” S made by stirring at 100 ° C. for 1 hour to make it uniform and then cooled to 700 ° C., and 2 parts by weight of Ube Industries, Ltd. t-butylcatechol as a curing accelerator is further added to 70 ° C. Stirred for 30 minutes and dissolved uniformly.

[Example 1]
FIG. 7 is a schematic perspective view showing an aspect of the reinforcing fiber base material of this example of the present invention. The warp yarns 75 and the warp auxiliary yarns 76 are alternately arranged alternately with the reinforcing fiber yarns as warp yarns 75, the glass fiber yarns as warp auxiliary yarns 76, and the polyamide 66 fiber yarns as weft yarns 77. The warp auxiliary yarns 76 and the weft yarns 77 are interlaced to obtain a unidirectional non-crimp fabric (woven fabric A) which is a fabric 74 holding the reinforcing fiber yarns 75 integrally. The fabric A had a fabric thickness of 0.2 mm, a basis weight of reinforcing fiber yarn of 193 g / m ² , a warp (warp auxiliary yarn) density of 1.8 yarns / cm, and a weft yarn density of 3 yarns / cm.

  On the woven fabric A, the particulate resin material was dropped by its own weight while being measured with an embossing roll and a doctor blade. At this time, the particles falling under their own weight pass through the vibration net and are uniformly dispersed, and are applied to one surface of the fabric through masking (a 1 mm mask arranged at a pitch of 5.3 mm (period)). did. That is, the particulate resin material is applied in a stripe form. The coating amount of the particulate resin material was 14% by weight of the base material A described later. Further, while heating to 180-200 ° C. with a far infrared heater, pressurization with a metal nip roller that has been subjected to a release treatment, adheres the particulate resin material to the fabric A, and then forcibly cools with cold water Then, it was wound up to obtain a base material A which is a reinforcing fiber base material 78. As shown in FIG. 7, in the base material A, the gap 71 was continuously located between the reinforcing fiber yarns (warp yarns 75) in the fabric. Further, the resin material was present in the form of dots 73 in the filling portion 72.

The obtained base material A has a base material thickness of 0.23 mm, a reinforcing fiber volume ratio V _{ff of} 46%, a base material weight of 230 g / m ² , an area coverage of 62%, and the average diameter of the resin material is 0.00. The average thickness of 2 mm and the resin material was 29 μm.

[Example 2]
Two sets of the substrate A obtained in Example 1 were prepared by repeating the [−45 ° / 0 ° / + 45 ° / 90 °] three times of the laminated structure, and the 90 ° layers were opposed to each other. The layers were laminated so as to form a mirror-symmetric laminate. Such a laminate was placed in a planar shape and sealed with a sealant and a bag material (polyamide film) to form a cavity provided with a vacuum suction port. The inside of the cavity was depressurized by a vacuum pump from the vacuum suction port, and the shaping mold was temperature-controlled at 60 ° C. This state was maintained for 2 hours, and after cooling to room temperature, suction was stopped and taken out to obtain Preform A. The reinforcing fiber volume fraction V _pf of the preform A was 51%.

[Example 3]
Preform A is placed on a flat mold (aluminum), a resin diffusion medium (smooth metal mesh) is placed on the preform, and sealed with a sealant and bag material, and a resin injection port And a cavity provided with a vacuum suction port. The inside of the cavity was evacuated to a vacuum from a vacuum suction port by a vacuum pump, and the temperature of the mold and each preform was adjusted to 60 ° C. Next, the matrix resin prepared and vacuum degassed in advance was poured from the resin inlet using atmospheric pressure while maintaining the temperature at 60 ° C. When the matrix resin reached the vacuum suction port, the injection port was closed to stop the injection. Thereafter, the matrix resin was cured by maintaining at 180 ° C. for 2 hours while continuing to reduce the pressure from the reduced pressure suction port, and composite material A was obtained. The composite material A has no pinholes or voids anywhere, and has been proved to be well molded.

The reinforcing fiber volume fraction V _f of the composite material A was 56%. Using the obtained composite material A, CAI at 23 ° was measured based on SACMA SRM 2R-94. The impact was obtained by dropping a weight of 5.44 kg (12 pounds) to obtain a falling weight impact energy of 6.67 kJ / m (270 in · lb).

[Example 4]
Two sets of the base material A obtained in Example 1 were prepared by repeating the [−45 ° / 0 ° / + 45 ° / 90 °] eight times as the laminated structure, and the 90 ° layers were faced to each other. Thick preform A was obtained in the same manner as in Example 3 except that the layers were laminated so as to be mirror-symmetrically laminated and the shaping mold was temperature-controlled at 80 ° C. The thick preform A was impregnated and cured with a matrix resin in the same manner as in Example 3 except that a glass plate was used as a flat mold. For the impregnation property, the impregnation time of the thick preform A was measured. For comparison with a comparative example described later, relative evaluation was performed using an index with the time taken in this example as 100.

  In addition, the difference of the reinforced fiber volume ratio of the thick preform A and the molded thick composite material A was small, and the thing excellent in the dimensional accuracy of the thickness direction was obtained.

[Comparative Example 1]
A reinforced fiber base material B was obtained as it was in the same manner as in Example 1 except that the resin material was not adhered. The obtained base material B had a base material thickness of 0.2 mm, a base fiber B reinforcing fiber volume ratio V _{ff of} 54%, a base material weight of 193 g / m ² , and an area coverage of 0%.

[Comparative Example 2]
Reinforcing fiber substrate C was obtained in the same manner as in Example 1 except that the resin material was applied without masking, and the resin material was adhered only with a far-infrared heater without using a metal nip roller. The obtained base material C has a base material thickness of 0.32 mm, a reinforcing fiber volume ratio V _{ff of} 34%, a base material weight of 230 g / m ² , an area coverage of 78%, and an average diameter of the resin material of 0. The average thickness of 2 mm and the resin material was 124 μm.

[Comparative Example 3]
Preforms B and C were obtained in the same manner as in Example 2 except that the base materials B and C obtained in Comparative Examples 1 and 2 were used. The reinforcing fiber volume fraction V _pf of the preforms B and C was 58% and 47%.

[Comparative Example 4]
Composite materials B and C were molded in the same manner as in Example 3 except that the preforms B and C obtained in Comparative Example 3 were used. The carbon fiber content V _f of the composite materials B and C was 61% and 54%, respectively.

[Comparative Example 5]
The impregnation property was evaluated in the same manner as in Example 4 except that the base materials B and C obtained in Comparative Examples 1 and 2 were used. In addition, the difference in the reinforcing fiber volume ratio between the thick preform C obtained from the substrate C and the molded thick composite material C was large, and the dimensional accuracy in the thickness direction was inferior.

  The results are shown in Table 1.

  As is apparent from Table 1, the base material A of Example 1 and the base material C of Comparative Example 2 have a form stability that does not cause misalignment or meandering of the fabric due to the resin material adhered on the fabric. When these were preformed, excellent tackiness was expressed. All of them were excellent in mechanical properties. On the other hand, the base material B which does not have the resin material of the comparative example 1 was remarkably inferior in both handleability and mechanical properties.

  However, the base material C which does not have the space | gap part of the comparative example 2 is remarkably inferior in the impregnation property, and the base material A of Example 1 was excellent. From the above results, the effect of the present invention is clear.

  According to the present invention, a composite material having not only excellent handling properties but also high mechanical properties and excellent matrix resin impregnation properties and a method for producing the same, and a preform obtained from such a reinforcing fiber substrate A composite material obtained from such a reinforcing fiber substrate or preform can be obtained.

  The composite material thus obtained is suitable for a wide range of fields including structural members, inner layer members or outer layer members in transportation equipment such as aircraft, automobiles and ships, but is particularly suitable for structural members of aircraft. is there.

It is a plane schematic diagram which shows one aspect | mode of the stripe form of material. It is a plane schematic diagram which shows one aspect | mode of the tile form of a resin material. It is a plane schematic diagram which shows another aspect of the tile form of a resin material. It is a plane schematic diagram which shows another aspect of the stripe form of the resin material. It is a plane schematic diagram which shows the one aspect | mode of the resin material. It is a plane schematic diagram which shows another aspect of the resin material. It is a perspective schematic diagram which shows the aspect of the reinforced fiber base material of Example 1 of this invention.

Explanation of symbols

10, 20, 30, 40, 50, 60: Resin material 11, 21, 31, 41, 71: Continuous void portion 12, 22, 32, 42, 52, 72: Filling portion 43, 63, 73: Dot Resin material 51: Non-continuous void portion 74: Fabric 75: Warp yarn 76: Warp auxiliary yarn 77: Weft yarn 78: Reinforcing fiber base material a, c, e: Width direction b, d: Warp direction period

Claims (18)

Reinforced fiber base material used for composite material formed by impregnating matrix resin into laminated reinforcing fiber base material, and the reinforcing fiber base material is formed using at least reinforcing fiber yarn and resin material The reinforcing fiber volume fraction V _{ff of the} reinforcing fiber base calculated from the thickness of the reinforcing fiber base is 30 to 60%, and the resin material to be bonded is in the following requirements 1 to 3 Reinforcing fiber substrate characterized by satisfying both.
[Requirement 1]: Adhering to at least the surface of the fabric.
[Requirement 2]: Adhering in a form having continuous voids periodically.
[Requirement 3]: Adhering at 2 to 20% by weight of the reinforcing fiber substrate.   The reinforcing fiber substrate according to claim 1, wherein the resin material is substantially bonded only to the surface of the substrate.   The reinforcing fiber substrate according to claim 1 or 2, wherein a main component of the resin material is a thermoplastic resin.   The reinforcing fiber substrate according to claim 3, wherein the thermoplastic resin is at least one selected from polyamide, polyetherimide, polyphenylene ether, polyethersulfone, and phenoxy.   The reinforcing fiber substrate according to any one of claims 1 to 4, wherein the resin material is bonded with an area coverage of more than 5% and less than 70%.   The reinforcing fiber substrate according to any one of claims 1 to 5, wherein the resin material is bonded in a stripe form or a tile form.   The reinforcement according to any one of claims 1 to 6, wherein the resin material is bonded in a form having continuous voids periodically, and the period of the continuous voids is 150 mm or less. Fiber substrate. The reinforcing fiber base material is a unidirectional woven fabric or a unidirectional sheet, and the basis weight of the reinforcing fiber yarn is 50 to 500 g / m ² . Reinforcing fiber substrate. The said reinforcing fiber base material is a bidirectional fabric or a multidirectional sheet | seat, and the fabric weight of a reinforcing fiber thread | yarn is 100-1000 g / m < ² >, The one in any one of Claims 1-7 characterized by the above-mentioned. Reinforcing fiber substrate.   The reinforcing void base material according to any one of claims 1 to 9, wherein the void portion is located at least between the reinforcing fiber yarns in the fabric.   The reinforcing fiber base material according to any one of claims 1 to 10, wherein the void is continuously located between the reinforcing fiber yarns in the fabric.   The reinforcing fiber substrate according to any one of claims 1 to 11, wherein the resin material is bonded in a continuous or discontinuous form in a filling portion other than a continuous void portion.   The reinforcing fiber substrate according to claim 12, wherein the resin material in the discontinuous form is a spot having an average diameter of 5 mm or less.   The reinforcing fiber substrate according to any one of claims 1 to 13, wherein an average thickness in a filling portion other than the continuous void portion of the resin material is 2 to 100 µm.   The reinforcing fiber base material according to any one of claims 1 to 14, wherein two or more layers are laminated, and the reinforcing fiber base materials are at least partially bonded and integrated by the resin material. A preform characterized by being.   A composite material obtained by impregnating the reinforcing fiber substrate according to any one of claims 1 to 14 or the preform according to claim 15 with a matrix resin. A method for producing a reinforced fiber base material used in a composite material that is formed by impregnating a matrix resin and then molding after laminating the reinforced fiber base material, comprising: (A) forming a fabric using at least reinforcing fiber yarns; (B) Reinforcing fiber volume of the base material calculated from the base material thickness in a form having continuous voids periodically on at least the surface of the fabric using a resin material of 2 to 20% by weight of the reinforcing fiber base material A method for producing a reinforcing fiber base material, wherein adhesion is performed so that the rate V _ff is 30 to 60%.   The means for adhering the resin material is one that masks the substrate surface and applies the resin material, or one that transfers or bonds a film-like resin material to the substrate surface. Item 18. A method for producing a reinforcing fiber substrate according to Item 17.

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