JP2019099987A - Reinforced-fiber substrate, reinforced-fiber laminate and fiber-reinforced resin - Google Patents

Abstract

To provide a reinforced-fiber substrate and a reinforced-fiber laminate, which have good impregnation with matrix resin, can produce a fiber-reinforced resin excellent in mechanical characteristics (especially, compression strength after applying impact: CAI) such as impact resistance with good productivity and excellent in handling property (especially, shape stability).SOLUTION: There is provided a reinforced-fiber substrate comprising: a reinforced-fiber assembly selected from any one of [1] reinforced-fiber yarns, [2] a group of reinforced-fiber yarns formed by paralleling reinforced-fiber yarns in parallel, and [3] a reinforced-fiber fabric that is comprised of [1] or [2]; and a mesh-like resin material arranged on at least one surface thereof, where the resin material is a polyamide copolymer comprising at least two polyamide components selected from polyamide 6, polyamide 6-6, polyamide 6-10, polyamide 12, and polyamide 6-I, and has a melting point in the range of 80 to 180°C.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reinforcing fiber base, a reinforcing fiber laminate and a fiber-reinforced resin comprising the same.

  A fiber reinforced resin (FRP) in which a reinforcing fiber is impregnated with a matrix resin has been mainly used for aviation, space, sports applications because it meets the required characteristics such as excellent mechanical properties and weight reduction. The autoclave molding method is known as a typical manufacturing method of these. In this molding method, a prepreg in which a reinforcing fiber bundle group is impregnated in advance with a matrix resin is laminated on a molding die and heated and pressurized by an autoclave to mold an FRP. The use of a prepreg has the advantage of obtaining an extremely reliable FRP, but has the problem of high cost in manufacturing.

  On the other hand, as a molding method excellent in FRP productivity, for example, injection molding such as resin transfer molding method (RTM) can be mentioned. In the RTM molding method, a reinforcing fiber base composed of a group of dry reinforcing fiber bundles not preimpregnated with a matrix resin is laminated on a molding die, and a liquid low-viscosity matrix resin is injected. And the matrix resin is impregnated and solidified to form FRP.

  The injection molding method is excellent in FRP productivity, but since the matrix resin needs to have a low viscosity, the mechanical properties are sufficiently exhibited as compared to the FRP molded from the high viscosity matrix resin used for the prepreg. I could not do it.

  As a solution to the above, as disclosed in, for example, Patent Document 1 and Patent Document 2, an intermediate in which a unidirectional layer of carbon fiber having a defined basis weight and a thermoplastic fiber web (non-woven fabric) having a defined thickness are combined. Materials have been proposed. However, although it has been disclosed that certain mechanical properties can be exhibited when using these thermoplastic fiber webs, post-impact compressive strength (CAI) and interlayer shear, which are important as mechanical properties of structural members of aircraft, are disclosed. With regard to thermoplastic fiber webs that together improve strength (ILSS), no specific proposal has been made in the prior art, and it has been difficult to provide a carbon fiber reinforced composite material having high CAI and ILSS. there were.

Japanese Patent Application Publication No. 2012-506499 Japanese Patent Publication No. 2008-517812

  The present invention solves the problems of the prior art, and specifically, a fiber reinforced resin which is excellent in the impregnation property of a matrix resin and is excellent in mechanical properties such as impact resistance (in particular, CAI and ILSS). It is an object of the present invention to provide a reinforcing fiber base and a reinforcing fiber laminate not only obtained with good productivity but also excellent in handleability (in particular, shape stability). Another object of the present invention is to provide a fiber-reinforced resin obtained from such a reinforcing fiber base and a reinforcing fiber laminate.

The present invention adopts the following means in order to solve the problems. That is,
(1) [1] Reinforcing fiber yarn, [2] Reinforcing fiber yarn formed by aligning reinforcing fiber yarns in parallel, [3] [1] or [2] reinforced fiber fabric, A reinforcing fiber assembly selected from any one of them, and a reinforcing fiber base on which a reticulated resin material is disposed on at least one side surface thereof,
The resin material is a copolyamide comprising at least two polyamide components selected from polyamide 6, polyamide 6-6, polyamide 6-10, polyamide 12, polyamide 6-I, and the melting point of the resin material is 80 to A reinforcing fiber base characterized in that it is in the range of 180 ° C.
(2) [1] Reinforcing fiber yarn, [2] Reinforcing fiber yarn formed by aligning reinforcing fiber yarns in parallel, [3] [1] or [2] reinforced fiber fabric, A reinforcing fiber assembly selected from any one of them, and a reinforcing fiber base on which a reticulated resin material is disposed on at least one side surface thereof,
The resin material is a copolyamide comprising at least two polyamide components selected from polyamide 6, polyamide 6-6, polyamide 6-10, polyamide 12, polyamide 6-I, and the softening point of the resin material is 80 Reinforcing fiber base material characterized by being within the range of -220 ° C.
(3) The reinforcing fiber base according to (1) or (2), wherein the resin material is 1 to 20% by weight of the reinforcing fiber base.
(4) The reinforcing fiber group according to any one of (1) to (3), wherein the resin material contains at least polyamide 12 and the composition ratio of the polyamide 12 is in the range of 5 mol% to 99 mol%. Material.
(5) The reinforcing fiber base according to any one of (1) to (4), wherein the group of reinforcing fiber yarns is in the form of a sheet in which a plurality of reinforcing fiber yarns are aligned in parallel.
(6) The reinforcing fiber base according to any one of (1) to (4), wherein the reinforcing fiber yarn group is in the form of a sheet parallelly arranged by the automated fiber placement apparatus. .
(7) The reinforcing fiber fabric includes a reinforcing fiber thread group in which reinforcing fiber threads are aligned in parallel in one direction and a reinforcing fiber extending in a direction intersecting the reinforcing fiber thread group. The reinforcing fiber base according to any one of (1) to (4), which is a unidirectional woven fabric composed of an auxiliary fiber yarn group having 1/5 or less of the fineness of the yarn.
(8) The reinforcing fiber fabric comprises a reinforcing fiber thread group in which reinforcing fiber threads are aligned in parallel in one direction, and a reinforcing fiber thread parallel in one direction in a direction intersecting the reinforcing fiber thread group. The reinforcing fiber base according to any one of (1) to (4), which is a bi-directional woven fabric composed of a reinforcing fiber yarn group formed by aligning them.
(9) The reinforcing fiber fabric comprises a reinforcing fiber thread group in which reinforcing fiber threads are aligned in parallel in one direction and a reinforcing fiber thread parallel in one direction in a direction intersecting the reinforcing fiber thread group. A stitch base material in which at least two or more layers of a reinforcing fiber yarn group are aligned and stitched together by an auxiliary fiber yarn group having a fineness of 1⁄5 or less of that of the reinforcing fiber yarn line; The reinforcing fiber base according to any one of (1) to (4).
(10) A reinforced fiber laminate obtained by laminating a plurality of the reinforced fiber substrates according to any one of (1) to (9).
(11) The reinforced fiber laminate according to (10), which is integrated by heat fusion or stitching.
(12) A fiber-reinforced resin obtained by impregnating a matrix resin with the reinforcing fiber base according to any one of (1) to (9) or the reinforcing fiber laminate according to (10) to (11).
(13) The fiber according to (12), wherein the volume content of reinforcing fiber is in the range of 53 to 65%, and the normal temperature compressive strength after impact application described in SACMA-SRM-2R-94 is 240 MPa or more Reinforced resin.
It is.

  According to the present invention, as described below, a reinforcing fiber base and a reinforcing fiber laminate excellent not only in form stability but also in resin impregnation property at the time of RTM molding can be obtained, and impact resistance after molding It is possible to obtain FRP excellent in sex.

It is a schematic sectional drawing explaining the one aspect | mode of the reinforced fiber base material of this invention. It is a schematic side view which shows one aspect of the manufacturing apparatus of the reinforced fiber base material of this invention. It is a schematic perspective view which shows the one aspect | mode of the reinforcing fiber yarn group used for this invention. It is a schematic perspective view which shows the one aspect | mode of the unidirectional textile fabric as a reinforced fiber assembly used for this invention. It is a schematic perspective view which shows the one aspect | mode of the bidirectional | two-way fabric as a reinforced fiber assembly used for this invention. It is a schematic perspective view which shows the one aspect | mode of the stitch fabric as a reinforced fiber assembly used for this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view for explaining one aspect of the reinforcing fiber base 11 of the present invention. The reinforcing fiber base 11 shown in this figure is adhesively integrated after the resin material 13 is disposed on one side of the reinforcing fiber assembly 12.

  The reinforcing fiber base 11 is a reinforcing fiber assembly 12 selected from any of a reinforcing fiber yarn, a reinforcing fiber yarn group, or a reinforcing fiber fabric composed of a reinforcing fiber yarn or a reinforcing fiber yarn group. It is important to have the resin material 13 on at least one side surface. By making the resin material 13 exist on at least one surface, it is possible to improve the form stability such as the width of the reinforcing fiber base 11 and the fiber orientation, or a sheet-like reinforcing fiber group comprising reinforcing fiber yarns. Handleability at the time of conveyance of material 11 etc. can be improved.

  In addition, it is possible to impart the adhesiveness of the reinforcing fiber assemblies 12 with each other when obtaining a laminate (preform) in which the reinforcing fiber base 11 or the reinforcing fiber assembly 12 described later is laminated, or appropriate for the preform. The handleability of the preform can be improved, for example, it is possible to impart rigidity, and to impart a form stabilization effect such as preventing the eye gap of reinforcing fibers in the preform.

  In particular, the resin material 13 of the present invention secures a space for flowing and diffusing a matrix resin described later between the layers of the reinforcing fiber assembly 12 (imparting plastic deformability between the layers of the reinforcing fiber assembly 12 by the matrix resin). Or the resin material 13 acts as a stopper for cracks generated between the layers of the reinforcing fiber assembly 12 or the like, so that damage to the layers of the reinforcing fiber assembly 12 can be suppressed when it is subjected to an impact. Exerts the effect of being able to achieve mechanical properties (especially CAI). Besides, the resin material 13 serves as a spacer, and a flow path of the matrix resin is secured between the layers of the reinforcing fiber assembly 12, which facilitates the impregnation of the matrix resin when it is subjected to injection molding. The impregnation speed is also increased, and the FRP productivity is enhanced.

  The resin material 13 may be bonded to the reinforcing fiber assembly 12 and be present at least on one surface of the reinforcing fiber assembly 12 and be present in the reinforcing fiber assembly 12 (penetrate to the reinforcing fiber yarns). It may be Preferably, it is preferable that 50% by weight or more, more preferably 70% by weight or more is unevenly distributed on the surface of the reinforcing fiber assembly 12 for the reasons described above. In addition, a binder component may be included for the purpose of bonding the resin material 13 and the reinforcing fiber assembly 12, and it is also possible to use, for example, a thermoplastic resin having a softening point lower than that of the resin material 13 or a thermosetting resin. .

  Moreover, as for the reinforcing fiber base material 11 of this invention, the place where the form of the resin material 13 is mesh shape is important. In the present invention, the mesh shape means a shape in which a hole is formed in the thickness direction on the plane, and if it is such a shape, the flow path of the matrix resin or the air in the thickness direction of the reinforcing fiber base 11 Not only can it be secured, but because there is a connection in the planar direction, improvement in width stability when using reinforcing fiber yarns, handling when conveying sheet-like reinforcing fiber base material 11 consisting of reinforcing fiber yarns, etc. In addition, it is possible to improve the form stability of the base when using a reinforcing fiber yarn group or a cloth. Examples of the reticulated resin material 13 include nonwoven fabric, mat, net, mesh, fabric, knit, short fiber group, perforated film, porous film and the like. Among them, non-woven fabrics, mats or meshes are preferable because they can be obtained at low cost, and flow paths of matrix resin and air are also formed in the planar direction, so that the above-mentioned effects can be expressed highly. When the resin material 13 is a non-woven fabric, long fibers and short fibers may be mentioned as the form of the constituting fiber, and it is manufactured by methods such as melt blowing, spun bonding, air laid, carding and papermaking, but is not particularly limited. Moreover, you may contain the binder component for making fibers bind as a subcomponent. It is preferable that the fiber diameter of the fiber to comprise is 1 micrometer or more, 5 micrometers or more are more preferable, and 10 micrometers or more are more preferable. If the fiber diameter is less than the above range, the surface area of the resin material is increased, and the resin flow may be hindered in the resin impregnation step described later, which is not preferable.

  It is important that the resin material 13 of the present invention is a copolyamide containing at least two polyamide components selected from polyamide 6, polyamide 6-6, polyamide 6-10, polyamide 12, and polyamide 6-I. The resin material 13 can form a layer with high toughness between the FRP layers by melting at the time of FRP molding, and can improve mechanical properties (in particular, CAI and ILSS).

  The resin material 13 used in the present invention is preferably 1 to 20% by weight of the reinforcing fiber base 11. It is preferably 2 to 18% by weight, more preferably 3 to 16% by weight. By the resin material 13 being arrange | positioned in the said range, the form stability of the reinforcement fiber base material 11 is provided, and it becomes possible to obtain the reinforcement fiber base material 11 excellent in the handleability. If it is less than 1% by weight, not only the handleability of the reinforcing fiber base 11 is reduced, but also the improvement effect of the mechanical properties (especially CAI) is reduced, which is not preferable. On the other hand, if it exceeds 20% by weight, the volume content of reinforcing fibers when FRP is made too low, or the heat resistance, chemical resistance and compressive strength of FRP may deteriorate, which is not preferable.

  Moreover, it is important that the softening point of the resin material 13 used by this invention is 80-220 degreeC. Preferably it is 100-200 degreeC, More preferably, it is the range of 120-180 degreeC. Here, in the present invention, the softening point refers to the melting point when the resin material is a crystalline polymer, and the glass transition temperature when the resin material is an amorphous polymer, using a differential scanning calorimeter (DSC) according to JIS K 7121 (1987). Therefore, it refers to the value measured at a heating rate of 10 ° C./min. If the softening point is less than 80 ° C., the heat resistance of the FRP is lowered, which is not preferable. If the softening point is 220 ° C. or higher, the resin material 13 may not melt during molding, and the mechanical properties (in particular, CAI and ILSS) of the FRP may be reduced. That is, it is desirable that the upper limit of the softening point of the resin material 13 be lower than the molding temperature at the time of FRP molding.

  Here, among the polyamide components constituting the resin material 13 described above, since the polyamide 6-I is an amorphous polymer, it is a copolymerized polyamide when the polyamide 6-I is not contained or the blending ratio is low. Is likely to be a crystalline polymer, and conversely, when polyamide 6-I is the main component, it tends to be an amorphous polymer.

  Furthermore, it is important that the melting point of the resin material 13 used in the present invention is 80 to 180 ° C. It is preferably in the range of 100 to 175 ° C, more preferably 120 to 170 ° C. Here, in the present invention, the melting point refers to a value measured at a temperature increase rate of 10 ° C./min according to JIS K 7121 (1987) using a differential scanning calorimeter (DSC). If the melting point is less than 80 ° C., the heat resistance of FRP is unfavorably lowered. When the melting point is 180 ° C. or more, the resin material 13 may not melt during molding, and the mechanical properties of FRP (particularly, CAI and ILSS) may be reduced. That is, it is desirable that the upper limit of the melting point of the resin material 13 be lower than the molding temperature at the time of FRP molding.

  Moreover, as the resin material 13 of the present invention, it is preferable to contain polyamide 12 having a low water absorption rate, from the viewpoint of suppressing the decrease in mechanical properties under the wet heat condition of FRP. Therefore, the proportion of the polyamide 12 in the resin material 13 is 5 mol% or more, preferably 50 mol% or more, and more preferably 80 mol% or more. Examples of resin materials that can be copolymerized with the polyamide 12 include polyamide 6, polyamide 6-6, polyamide 4-6, polyamide 6-10, polyamide 6-12, polyamide 6-T, polyamide 6-I, polyamide 6- 6 / 6-T, polyamide 6-6 / 6-I, polyamide 6-6 / 6-T / 6-I, polyamide MACMI and the like. As particularly preferable ones, polyamide 6, polyamide 6-6, polyamide 6-10, polyamide 12, polyamide 6-I can be mentioned, and further, these resin materials can be selected according to necessary characteristics such as processability, heat resistance and toughness. Correspondingly, it is also preferred to use as a mixture.

  Further, when the resin material 13 melts during molding, if the compatibility with the matrix resin of FRP is low, peeling occurs at the interface between the resin material 13 and the matrix resin, and the effect of improving the mechanical characteristics can be satisfactorily obtained. There is something I can not do. Accordingly, the absolute value of the solubility parameter difference between the resin material 13 and the matrix resin is preferably 5 or less, preferably 3 or less. In addition, the solubility parameter of the resin material 13 is calculated | required by (1) Formula. The method is described in "Fukumoto Osamu (1988)" Polyamide resin handbook "Nikkan Kogyo Shimbun.

M: molecular weight :: density ΔH: amide group interaction T: temperature

  Also, the solubility parameter of the matrix resin is determined by the value of the repeating unit of the polymer at a temperature of 25 ° C., which is determined by the method of Fedors. The method is described in F.I. Fedors, Polym. Eng. Sci. , 14 (2), 147 (1974).

  The reinforcing fiber yarns used in the present invention are multifilament yarns and are glass fiber yarns, organic (aramid, PBO, PVA, PE etc.) fiber yarns, carbon fiber (PAN-based, pitch-based etc) yarns and the like. Since carbon fibers are excellent in specific strength and specific elastic modulus and hardly absorb water, they are preferably used as reinforcing fibers for aircraft structural materials and automobiles.

  The reinforcing fiber yarn used in the present invention is preferably 3,000 to 50,000 filaments, and particularly preferably 12,000 to 24,000 filaments from the viewpoint of handling. The form of the reinforcing fiber yarn is not particularly limited, but is preferably a non-twisting yarn excellent in the stability of the width and thickness of the yarn, and further preferably a spread fiber excellent in fiber orientation.

  Here, the reinforcing fiber base of the present invention is [1]: reinforcing fiber yarn, [2]: reinforcing fiber yarn formed by aligning reinforcing fiber yarns in parallel, or [3] reinforcing fiber yarn or It is important to be composed of a reinforcing fiber assembly selected from any of the reinforcing fiber fabrics composed of reinforcing fiber yarns.

  First, [1]: A reinforcing fiber base 21 composed of reinforcing fiber yarns is produced using, for example, the apparatus illustrated in FIG. Specifically, the reinforcing fiber yarn 22 pulled out from the bobbin 20 is opened by the opening unit 201, adjusted to a desired width by the width regulating roller 202, and then reticulated in advance to a desired width. And heating by means of the heater 203 and pressure bonding by means of the press roll 204. The opening unit 201 is configured by a vibrating roller or the like, and includes a mechanism that applies vibration in the vertical direction or horizontal direction orthogonal to the traveling direction of the reinforcing fiber yarn 22. The opening unit 201 may also include a heater (not shown) for softening the sizing agent attached to the surface of the reinforcing fiber yarn 22. At this time, assuming that the yarn width of the reinforcing fiber yarn 22 pulled out from the bobbin 20 is w0, the width of the reinforcing fiber yarn 22 after opening is widened to w1 (w0 <w1), and then the width regulating roller 202 The width is adjusted to w2 (w1> w2). It is preferable to adjust w2 in accordance with the weight of the reinforcing fiber base 21 required. Further, in order to improve the width accuracy of the reinforcing fiber base 21, it is preferable that the press roll 204 have a grooved structure.

  The reinforcing fiber base 21 produced by such a device has good stability of width and weight and excellent fiber orientation, and therefore can contribute to the improvement of mechanical properties (particularly compressive strength) of FRP. Further, it is preferable to dispose the reticulated resin material 203 on both sides of the reinforcing fiber yarn group because the shape stability of the reinforcing fiber base 21 is further improved.

  Next, [2]: The reinforcing fiber base 21 consisting of reinforcing fiber threads is a plurality of bobbins in the apparatus exemplified in FIG. 2 in the same manner as the method for producing the reinforcing fiber base consisting of reinforcing fiber threads 22. It is created by pulling 20 while pulling a plurality of reinforcing fiber yarns 22 in parallel. Here, parallel alignment means that adjacent reinforcing fiber yarns 22 do not substantially cross or intersect with each other, and preferably, adjacent two reinforcing fiber yarns are 100 mm in size. When approximated to a straight line in the range of length, the angle formed by the approximated straight line is aligned so as to be 5 ° or less, more preferably 2 ° or less. Here, approximating the reinforcing fiber yarn 22 as a straight line means connecting a starting point and an end point of 100 mm to form a straight line. Adjacent reinforcing fiber yarns 22 may be separated by a constant distance or may overlap each other depending on the required basis weight of the reinforcing fiber base 21. When a certain distance is provided, the distance is preferably 200% or less of the width of the reinforcing fiber yarns 22. When overlapping, they may overlap 100% of the width of the reinforcing fiber yarns 22. It is preferable that the reinforcing fiber threads pulled out while being aligned in parallel in this way pass the opening unit and uniformly distribute the fabric weight in the width direction. In addition, the reinforcing fiber base 21 made from such reinforcing fiber yarns can be slit if necessary and controlled to any width.

  [3] The reinforcing fiber cloth constituted by the reinforcing fiber yarn or reinforcing fiber yarn will be described later.

  Further, as the reinforcing fiber base 21 using the reinforcing fiber yarn 22 and the reinforcing fiber yarn group, an automated fiber placement (AFP) or an automated tape layup (ATL) apparatus is suitably used. Such a device is used for the purpose of reducing the waste rate of the reinforcing fiber base 21 and automating the laminating process, but the shape stability of the reinforcing fiber base 21 is important because the width after placement and the fiber orientation are strictly required. Become. Here, since the reticulated resin material 23 used in the present invention is in a reticulated form, it can be suitably used for AFP and ATL because it is excellent in width stability and shape stability due to the connection in the plane direction.

  Further, as another embodiment of the reinforcing fiber yarn group of the present invention, a sheet-like one arranged in parallel by AFP or ATL can also be mentioned. FIG. 3 illustrates one embodiment of a reinforcing fiber yarn group used in the present invention, in which the reinforcing fiber yarns 32 are supplied by the AFP head 300 and are arranged in parallel. A reticulated resin material (not shown) of the present invention (not shown) is disposed on the reinforcing fiber yarn group 31 so as to be superposed, and heat-adhered with a far-infrared heater or the like to obtain a reinforcing fiber base. . Since the sheet-like reinforcing fiber yarn group 31 aligned and arranged by AFP or ATL is not restrained in the direction intersecting the fiber direction, there is a problem that the form of the reinforcing fiber yarn group 31 collapses during transportation. To solve this problem, by arranging and bonding the reticulated resin material, a constraining force in the direction crossing the fiber direction is generated, and the problem of transportation can be solved. Moreover, it is preferable that the space | interval of reinforcement fiber thread 32 at the time of arranging reinforcement fiber thread 32 by AFP or ATL is 0.5-2 mm. If the distance is less than 0.5 mm, the resin impregnation during RTM molding may not be sufficient. When the distance exceeds 2 mm, when laminating a plurality of reinforcing fiber substrates, the reinforcing fibers in the upper layer fall between the reinforcing fiber yarns 32 in the lower layer, generating waviness in the thickness direction, and mechanical characteristics (especially compression) Strength) may decrease.

  Next, [3] Reinforcing fiber as a reinforcing fiber fabric composed of reinforcing fiber yarns or reinforcing fiber yarns, woven fabrics (one-way, two-way, multi-axial), knits, braids, one-way aligned Sheet (one-direction sheet), a multi-axial sheet in which two or more layers of one-direction sheet are stacked, and the like can be mentioned. Such a reinforcing fiber assembly may be one in which a plurality of fibers are integrated by various joining means using a resin such as a stitch yarn, knot yarn, loose cloth, binder or the like. In particular, when used as a structural (especially primary structure) member of a transportation device (especially aircraft), it is preferably a unidirectional sheet, a unidirectional fabric, or a multiaxial sheet (especially stitched).

  FIG. 4 is a schematic perspective view showing an aspect of a unidirectional fabric 41 as a reinforcing fiber fabric used in the present invention. The reinforcing fiber yarns 42 and the auxiliary yarns 43 are arranged in the longitudinal direction of the reinforcing fiber assembly 41, that is, the warp direction, and the weft auxiliary yarns 44 thinner than the reinforcing fiber yarns 42 are arranged in the lateral direction. The yarn 43 and the weft auxiliary yarn 44 cross each other to form a unidirectional fabric having a woven structure as shown in FIG. The auxiliary yarn 43 is preferably low-shrinkable, and examples thereof include glass fiber yarn, aramid fiber yarn, carbon fiber yarn and the like, and the fineness (weight per unit length) of the auxiliary yarn is a reinforcing fiber It is preferable that it is 1/5 or less of the yarn. If it exceeds 1/5, the auxiliary yarn becomes thick, and the reinforcing yarn is crimped by the auxiliary yarn, and when it is made into FRP, the strength of the reinforcing fiber is slightly reduced. On the other hand, the fineness of the auxiliary yarn is preferably 0.05% or more of that of the reinforcing fiber yarn in terms of the form stability and the production stability of the reinforcing fiber assembly. The fineness of the above range is preferable because the strength reduction is minimized, and the gaps between the reinforcing fiber yarns 42 formed by the auxiliary yarn at the time of molding serve as resin flow paths, which can promote the impregnation of the matrix resin.

  FIG. 5 is a schematic perspective view showing an embodiment of a bi-directional woven fabric 51 as a reinforcing fiber fabric used in the present invention. The reinforcing fiber yarns 52 are arranged in the length direction of the bi-directional woven fabric 51, that is, in the warp direction, the reinforcing fiber yarns 53 are arranged in the weft direction, and the warp yarns 52 and the weft yarns 53 cross each other. It is a bi-directional fabric having a tissue.

  FIG. 6 is a schematic perspective view showing an aspect of a stitched fabric 61 as a reinforcing fiber fabric used in the present invention. From the lower surface of the stitched fabric 61, first, a large number of reinforcing fiber yarns are arranged in parallel in the oblique direction with respect to the longitudinal direction a to form the + α ° layer 62, and then a large number of reinforcements in the width direction of the reinforced fabric. The fiber yarns are arranged in parallel to form a 90 ° layer 63, and then a plurality of reinforcing fiber yarns are arranged in parallel in a diagonal direction to form a -α ° layer 64, and then the length direction of the reinforcing fabric A plurality of reinforcing fiber yarns are arranged in parallel to form a 0 ° layer 65, and in a state in which four layers having different arrangement directions are laminated, these four layers are stitched together by a stitch yarn 66. There is. Examples of the stitched structure formed by the stitch yarn 66 at the time of stitch integration include single ring stitching and 1/1 tricot knitting. The material of the stitch yarn can be selected from polyester resin, polyamide resin, polyethylene resin, vinyl alcohol resin, polyphenylene sulfide resin, polyaramid resin, compositions thereof, and the like. Among them, polyester resins and polyamide resins are preferable. From the viewpoint of the formability of the fabric, it is preferable to be a processed yarn of spandex (polyurethane elastic fiber), polyamide resin or polyester resin. The fineness of the stitch yarn is preferably 1⁄5 or less of that of the reinforcing fiber yarn in order to suppress the crimp of the reinforcing fiber yarn. Further, in view of form stability and production stability of the reinforcing fiber assembly, it is preferably 10 dtex or more, more preferably 30 dtex or more. Furthermore, it is preferable that the stitch yarn has stretchability from the viewpoint of shaping property in a preforming step described later. In FIG. 6, it can be seen whether the aggregate of reinforcing fibers whose cross-sectional shape is shown as an elliptical shape is one thread, and the stitching threads 66 are arranged between the reinforcing fiber threads, but the stitching threads 66 A bundle of reinforcing fibers, which are randomly inserted into the reinforcing fiber yarns and shown in an elliptical shape, is formed by the restraint of the stitch yarns 66.

  Here, although the configuration of the reinforcing fibers of the multiaxial stitch fabric 61 shown in FIG. 6 has been described as the four-layer configuration of + α ° layer / 90 ° layer / −α ° layer / 0 ° layer, it is not limited thereto Absent. For example, two layers consisting of 0 ° layer / 90 ° layer, + α ° layer / −α ° layer, 0 ° layer / + α ° layer, + α ° layer / 0 ° layer / −α ° layer, + α ° layer / −α layer Three layers consisting of ° layer / 0 ° layer etc. Also, 0 ° layer / + α ° layer / 0 ° layer /-α ° layer / 90 ° layer /-α ° layer / 0 ° layer / + α ° layer / 0 ° Like layers, it may include four directions of 0 °, + α °, -α °, and 90 ° in which many 0 ° layers are included. In addition, any of 0 °, + α °, -α °, and 90 ° may be included. The bias angle α ° is preferably 45 ° from the viewpoint of laminating a stitched fabric in the longitudinal direction of the FRP and effectively performing shear reinforcement with reinforcing fibers.

The preferred basis weight per layer in the reinforcing fiber base of the present invention is in the range of 50 to 800 g / m ² . More preferably 100 to 500 g / ^{m 2,} more preferably in the range of 120~300g / ^{m 2.} If it is less than 50 g / m ² , the number of laminated layers for obtaining a predetermined thickness of FRP increases, and the workability of molding is poor, which is not preferable. In addition, when the weight per layer is small, gaps are formed between the reinforcing fiber yarns and the reinforcing fiber yarns in the layer, the reinforcing fiber volume ratio Vf partially becomes nonuniform, and when formed, the reinforcing fiber volume ratio Vf is A large area has a thick FRP, and a small area of reinforcing fiber volume ratio Vf has a thin FRP, resulting in an FRP having an uneven surface. In such a case, if the reinforcing fiber yarn is thinly spread by a vibrating roller or air jet jet before weaving size or before integrated processing with stitch yarns, or / or after reinforcing fabric processing, reinforcing fibers all over the reinforcing fabric The volume ratio of (1) is uniform, and a smooth surface FRP is obtained. On the other hand, if it exceeds 800 g / m ² , the impregnation property of the matrix resin is deteriorated, which is not preferable.

  Next, the reinforced fiber laminate of the present invention will be described. Prior to FRP molding, the reinforcing fiber base of the present invention is laminated in a plurality of sheets until a desired thickness is reached, to form a reinforcing fiber laminate. In the present invention, in order to provide the handleability and the form stability of the reinforcing fiber laminate, it is preferable that they are integrated by heat fusion or stitching.

  Further, the reinforcing fiber laminate of the present invention imparts a three-dimensional shape to the carbon fiber laminate base using a shaping type, a jig, etc. in accordance with the form of the target carbon fiber reinforced resin molded product, It is also possible to make a shape-fixed preform. In particular, in the case where the mold has a three-dimensional shape, by doing so, it is possible to easily suppress the occurrence of fiber disturbance and wrinkles at the time of mold clamping or resin injection / impregnation.

  Next, the FRP of the present invention will be described. The FRP of the present invention is obtained by impregnating the above-mentioned reinforced fiber laminate with a matrix resin. Such matrix resin is solidified (cured or polymerized) as required. Preferred examples of such matrix resin include thermosetting resin, thermoplastic resin for RIM (Reaction Injection Molding), etc., among which epoxy resin, phenol resin, vinyl ester resin, non-equipment suitable for injection molding, and the like It is preferable that it is at least one selected from saturated polyester resin, cyanate ester resin, bismaleimide resin and benzoxazine resin.

  In addition, since the FRP of the present invention has excellent mechanical properties and is lightweight, the primary structural member, secondary structural member, exterior member, or interior member is used as an aircraft, automobile, or ship transportation device for its application. Is preferred.

  Next, a method of molding FRP using the reinforcing fiber base of the present invention will be described.

  Among the reinforcing fiber base of the present invention, the reinforcing fiber base consisting of a reinforcing fiber yarn and a reinforcing fiber yarn group is aligned and arranged in a desired shape by an AFP or ATL device.

  Such an arrangement step may be performed in a two-dimensional planar shape or may be performed in a three-dimensional shape. In the case of a two-dimensional planar shape, a reinforcing fiber base is arranged in each layer, and then a mesh-like resin material is arranged and adhered to make a sheet-like reinforcing fiber base easy to transport in each layer. It becomes possible to convey without breaking the shape in a state of being aligned and arranged in a shaping die which can be prepared and prepared separately. At this time, it is preferable that the reticulated resin material disposed at this time has a cut at least partially, since the formability in the preforming step described later is further improved. Moreover, as a conveyance means, the conveyance means by methods, such as static electricity, suction, and a needle stick, can be used.

  Further, in order to further improve the handling property, the sheet-like reinforcing fiber base prepared for each layer may be a reinforcing fiber laminate in which a plurality of layers are laminated and integrated by heat fusion or stitching. At this time, the reinforcement direction of the second and subsequent layers of the reinforcing fiber base of the nth layer is different from the direction of arrangement of the n−1th layer, thereby reinforcing the multiple layers which can be handled similarly to the fabric. It can be a fiber laminate. The step of integrating the reinforcing fiber base may be performed on the entire surface where the reinforcing fiber bases overlap, or may be partially performed. When integrated over the entire surface, the shape stability of the reinforcing fiber base is excellent. On the other hand, if it is partially integrated, it is likely to be deformed (i.e., the shapeability is good) at the time of shaping to the shape of a molded article in a preforming step described later. Therefore, it is preferable to use these arbitrarily depending on the complexity of the shape of the molded article.

  Here, the reinforcing fiber base material of the present invention is a reticulated resin in a reinforcing fiber thread group in which reinforcing fiber threads (without a resin material attached) are aligned in a desired shape by an AFP or ATL device. It can also include those in which materials are arranged and bonded. By this, it is possible to impart characteristics such as impact resistance to carbon fiber yarns not having characteristics such as impact resistance.

  Furthermore, after arranging the reinforcing fiber base of the first layer, the arrangement of the second and subsequent layers may be repeated on the same plane. In this placement step, a heater is provided in the head portion of the AFP or ATL device, and the second and subsequent layers of the reinforcing fiber base are placed while the resin material on the surface of the reinforcing fiber base is melted. And integration of the integration process. At this time, the reinforcement direction of the second and subsequent layers of the reinforcing fiber base of the nth layer is different from the direction of arrangement of the n−1th layer, thereby reinforcing the multiple layers which can be handled similarly to the fabric. It can be a fiber laminate.

  Further, among the reinforcing fiber base of the present invention, a reinforcing fiber base comprising a reinforcing fiber aggregate, and a reinforcing fiber laminate including a resin material between layers of reinforcing fiber yarns is a desired shape according to the shape of a molded article. It is cut and used.

  The reinforcing fiber base or reinforcing fiber laminate prepared in this manner is laminated in a desired angular configuration on a layer-by-layer basis or a plurality of layers, and then a preforming step is performed to form a preform. It is desirable to heat the preforming process in the range of -30 ° C to + 5 ° C of the softening point of the resin material. If the heating temperature is low, the resin material may not be sufficiently softened, and the shape of the preform may not be fixed. When the heating temperature is high, the resin material may penetrate into the reinforcing fiber base, and the impregnation of the matrix resin may be deteriorated.

  Molding of the FRP of the present invention is performed by so-called resin injection molding, and RTM (Resin Transfer Molding) molding or VaRTM (Vacuum assisted Resin Transfer Molding) molding is preferably applied. The reticulated resin material disposed on at least one side of the reinforcing fiber base of the present invention has a function as a flow path (air path) when discharging air inside the reinforcing fiber base, and a function as a resin diffusion medium. Demonstrate. Therefore, it is possible to realize the improvement of the internal quality of the molded product and the speeding up of the resin injection process. In addition, since the reticulated resin material disposed on at least one side of the reinforcing fiber base of the present invention has a connection in the planar direction, it is possible to prevent deformation of the reinforcing fiber base when injecting a resin at high pressure.

The FRP of the present invention has a reinforcing fiber volume content (Vf) in the range of 53 to 65%, and the cold compression strength after impacting described in SACMA-SRM-2R-94 is 240 MPa or more preferable. In addition, Vf (unit is vol%) refers to the volume ratio which a reinforced fiber occupies in fiber reinforced resin, and, specifically, it defines by following Formula, The symbol used here is as showing below.
Vf = (W × 100) / (ρ × T)
W: Weight of reinforcing fiber per 1 cm ² of reinforcing fiber substrate (g / cm ² )
ρ: density of reinforcing fibers (g / cm ³ )
T: Thickness of fiber reinforced resin (cm)

  When the Vf of the fiber reinforced resin is in the range of 53 to 65%, the excellent mechanical properties of the fiber reinforced resin can be maximally exhibited. If the Vf is less than 53%, the weight reduction effect is inferior, and if it exceeds 65%, molding in the above-mentioned injection molding becomes difficult, and mechanical properties (particularly impact resistance) may be deteriorated. That is, in such a Vf range, a material satisfying both the weight reduction effect and the mechanical properties when the normal temperature compressive strength after impact application described in SACMA-SRM-2R-94 of the fiber reinforced resin is 240 MPa or more can do. Fiber reinforced resins satisfying such requirements are used over a wide variety of applications because of their excellent mechanical properties and lightening effect. Although it is not particularly limited, it is used as a primary structural member, secondary structural member, exterior member, interior member or parts thereof in transportation equipment such as aircraft, automobile or ship, and the effect thereof is maximally exhibited.

  In addition, SACMA is an abbreviation of Suppliers of Advanced Composite Materials Association, and SACMA-SRM-2R-94 is a standard of the test method defined here. The cold compressive strength after impact is measured according to SACMA-SRM-2R-94 at an impact energy of 270 in-lb under dry conditions.

  Hereinafter, the present invention will be further described using examples. Raw materials and molding methods used in the examples and comparative examples are as follows. The present invention is not limited to these examples and comparative examples.

Example 1
<Reinforcing fiber yarn>
As a carbon fiber yarn, one of PAN-based carbon fiber, 24,000 filaments, tensile strength: 6.0 GPa, tensile modulus of elasticity: 294 GPa was used.

<Resin material>
It was prepared and polymerized so that 20 mol% of polyamide 6 and 80 mol% of polyamide 12 were obtained. The melting point was 150 ° C. and the solubility parameter was 8.5.

<Reticulated resin material>
The resin material was made into a non-woven fabric by a melt-blowing apparatus. The basis weight was 12 g / m ² .

<Matrix resin>
39 parts by weight of the following curing liquid was added to 100 parts by weight of the following main liquid, and an epoxy resin composition was uniformly stirred at 80 ° C. to obtain an epoxy resin composition. Solubility parameter: 11.0, viscosity according to E-type viscometer at 80 ° C: 55 mPa · s, viscosity after 1 hour: 180 mPa · s, glass transition point after curing at 180 ° C. for 2 hours: 197 ° C., flexural modulus: It was 3.3 GPa.
Main liquid: As epoxy, tetraglycidyl diaminodiphenylmethane type epoxy ("Araldite (registered trademark) MY-721, 40 parts by weight of Huntsman Japan KK) liquid bisphenol A type epoxy resin (" EPON "(registered trademark) 825, 35 parts by weight of Mitsubishi Chemical Co., Ltd., 15 parts by weight of diglycidyl aniline (GAN, manufactured by Nippon Kayaku Co., Ltd.), and triglycidyl aminophenol type epoxy resin ("jER" (registered trademark) 630, Ten parts by weight of Mitsubishi Chemical Co., Ltd. was weighed, and stirred at 70 ° C. for 1 hour to dissolve uniformly.
Curing solution: 70 parts by weight of modified aromatic polyamine ("jER Cure" (registered trademark) W, manufactured by Mitsubishi Chemical Corporation), 20 parts by weight of 3,3'-diaminodiphenyl sulfone (manufactured by Mitsui Chemicals Fine Inc.), And 10 parts by weight of 4,4'-diaminodiphenyl sulfone ("Seika Cure" S, manufactured by Seika Co., Ltd.), respectively, and after stirring and homogenizing at 100 ° C. for 1 hour, the temperature is lowered to 70 ° C. to cure As a promoter, 2 parts by weight of t-butyl catechol (DIC-TBC, manufactured by DIC Corporation) was weighed out, and the mixture was further uniformly dissolved by stirring at 70 ° C. for 30 minutes.

<Reinforcing fiber base material>
The apparatus shown in FIG. 2 was used to make a 1/4 inch wide tape-like reinforcing fiber substrate. The basis weight of the reinforcing fiber base was 162 g / m ² .

<Reinforcing fiber laminate>
Such a reinforcing fiber base is an AFP device in a quasi-isotropic laminated [45/0 / -45 / 90] _3S (24 layers: where "3S" is symmetrical to that laminated in the order of orientation angle shown in []. An embodiment in which three layers (8 layers × 3 = 24 layers) of the above-described lamination are combined to form one set (4 layers × 2 = 8 layers) is shown. After laminating on a planar preform mold with the above constitution, it was heated in an oven at the same temperature as the melting point (softening point) of the resin material in a state of being sealed with a bag film and a sealant and decompressed in vacuum. Thereafter, it was taken out of the oven, and the preform mold was cooled to room temperature and then depressurized to obtain a reinforced fiber laminate.

Fiber-reinforced resin
A resin diffusion medium (aluminium wire mesh) is laminated on the obtained reinforced fiber laminate, and a cavity is formed by sealing with a planar molding die and a bag material using a sealant, and it is placed in an oven at 80 ° C. I put it in. After the temperature of the reinforcing fiber laminate reached 80 ° C., the closed cavity was depressurized to a vacuum, and injection was performed only at a pressure difference from atmospheric pressure while maintaining the matrix resin at 80 ° C. After the resin was impregnated, the temperature was raised to 180 ° C. while continuing the pressure reduction, and the resin was allowed to stand for 2 hours for curing and was demolded to obtain an FRP flat plate 1. The Vf of the obtained FRP was 60%, the CAI was 268 MPa, and the ILSS was 89 MPa.

Example 2
The procedure was carried out except that the blending ratio of resin materials was changed and polymerization was performed so that 20% by mole of polyamide 6, 15% by mole of polyamide 6-6, 15% by mole of polyamide 6-10, and 50% by mole of polyamide 12 An FRP flat plate 2 was prepared in the same manner as in Example 1. The melting point of the obtained resin material was 120 ° C., the solubility parameter was 6.5, the Vf of FRP was 62%, the CAI was 266 MPa, and the ILSS was 92 MPa.

[Example 3]
After reinforcing fiber yarns to which a reticulated resin material is not attached are aligned in a two-dimensional plane shape using an AFP device to form a reinforcing fiber yarns group, and after the reticulated resin material is disposed thereon, By bonding by heating with an infrared heater, a planar reinforcing fiber base was produced. The basis weight of the reinforcing fiber base was 162 g / m ² .

The reinforcing fiber base material is conveyed layer by layer, and Example 1 is laminated except that it is laminated on a planar preform mold in a configuration of quasi-isotropic lamination [45/0 / -45 / 90] _3S (24 layers). FRP flat plate 3 was created in the same manner as in the above. The obtained FRP had a Vf of 59%, a CAI of 263 MPa and an ILSS of 90 MPa.

Example 4
Using a reinforcing fiber yarn and an auxiliary yarn ("ECE 225 1/0 1 Z", manufactured by UNITIKA CO., LTD.), A unidirectional fabric as shown in FIG. 4 was prepared, and a reticulated resin material was disposed on one side surface thereof. After that, by bonding by heating with a far infrared heater, a bonded reinforcing fiber base was produced. The basis weight of the reinforcing fiber base was 190 g / m ² .

An FRP flat plate was prepared in the same manner as in Example 1 except that the reinforcing fiber base was laminated on a planar preform mold in a quasi-isotropic laminated [45/0 / -45 / 90] _3S (24 layers) configuration. I created four. The Vf of the obtained FRP was 56%, the CAI was 248 MPa, and the ILSS was 95 MPa.

[Example 5]
A reticulated resin material is disposed between the interlayer and the lowermost layer using a reinforcing fiber yarn and a stitch yarn ("Grilon (registered trademark) K-140" 75 dtex, manufactured by Emskemy Japan Ltd.) and then stitched with a stitch yarn. As a result, a [45 / -45] two-layer reinforced fiber base was produced. The basis weight of the reinforcing fiber base was 268 g / m ² .

An FRP flat plate is prepared in the same manner as in Example 1 except that the reinforcing fiber base is laminated on a planar preform mold in a configuration of quasi-isotropic lamination [45 / -45 / 0/90] _3S (24 layers). Created 5 The obtained FRP had a Vf of 58%, a CAI of 264 MPa, and an ILSS of 92 MPa.

[Example 6]
An FRP flat plate 6 was produced in the same manner as in Example 1 except that the compounding ratio of the resin material was changed, and polymerization was carried out so that 80 mol% of polyamide 6 and 20 mol% of polyamide 6-6 would be obtained. The melting point of the obtained resin material was 195 ° C., the Vf of FRP was 52%, the CAI was 210 MPa, and the ILSS was 47 MPa.

Comparative Example 1
A reinforcing fiber base was prepared in the same manner as in Example 3 except that the form of the resin material was made powdery, but the sheet-like reinforcing fiber thread group aligned with AFP was separated during transportation, An article could not be obtained.

Comparative Example 2
An FRP flat plate 7 was produced in the same manner as in Example 1 except that polyamide 6-6 was used as the resin material. The Vf of FRP was 51%, the CAI was 190 MPa, and the ILSS was 43 MPa.

  Because the FRP of the present invention has excellent mechanical properties and is lightweight, its application is limited to primary structural members, secondary structural members, exterior members, or interior members in any of aircraft, automobile, and ship transportation equipment. Also, it is suitable for members for general industrial use such as medical devices such as a wind turbine blade, a robot arm and an X-ray top plate.

11: Reinforcing fiber base 12: Reinforcing fiber aggregate 13: Resin material 20: Bobbin 21: Reinforcing fiber base 22: Reinforcing fiber thread 23: Reticulated resin material 201: Opening unit 202: Width control roller 203: Heater 204: press roll 31: reinforcing fiber yarn group 32: reinforcing fiber yarn 300: AFP head 41: unidirectional fabric 42: reinforcing fiber yarn (warp)
43: Auxiliary yarn (warp)
44: Auxiliary yarn (weft)
51: bi-directional woven fabric 52: reinforced fiber yarn (warp)
53: Reinforcement fiber yarn (weft)
61: stitch fabric 62: form a reinforcement fabric + α ° reinforcement fiber layer 63: form a reinforcement fabric 90 ° reinforcement fiber layer 64: form a reinforcement fabric-α ° reinforcement fiber layer 65: form a reinforcement fabric 0 ° reinforcement fiber layer 66: Stitch yarn

Claims (13)

[1] any of the reinforcing fiber yarns, [2] the reinforcing fiber yarns formed by aligning the reinforcing fiber yarns in parallel, [3] [1] or [2] And a reinforcing fiber base on which a reticulated resin material is disposed on at least one side surface thereof.
The resin material is a copolyamide comprising at least two polyamide components selected from polyamide 6, polyamide 6-6, polyamide 6-10, polyamide 12, polyamide 6-I, and the melting point of the resin material is 80 to A reinforcing fiber base characterized in that it is in the range of 180 ° C. [1] any of the reinforcing fiber yarns, [2] the reinforcing fiber yarns formed by aligning the reinforcing fiber yarns in parallel, [3] [1] or [2] And a reinforcing fiber base on which a reticulated resin material is disposed on at least one side surface thereof.
The resin material is a copolyamide comprising at least two polyamide components selected from polyamide 6, polyamide 6-6, polyamide 6-10, polyamide 12, polyamide 6-I, and the softening point of the resin material is 80 Reinforcing fiber base material characterized by being within the range of -220 ° C. The reinforcing fiber base according to claim 1, wherein the resin material is 1 to 20% by weight of the reinforcing fiber base. The reinforcing fiber base according to any one of claims 1 to 3, wherein the resin material contains at least polyamide 12, and the composition ratio of the polyamide 12 is in the range of 5 mol% or more and less than 99 mol%. The reinforcing fiber base according to any one of claims 1 to 4, wherein the group of reinforcing fiber yarns is in the form of a sheet in which a plurality of reinforcing fiber yarns are aligned in parallel. The reinforcing fiber base according to any one of claims 1 to 4, wherein the reinforcing fiber yarn group is in the form of a sheet which is aligned in parallel by an automated fiber placement device. The reinforcing fiber fabric comprises a reinforcing fiber thread group in which reinforcing fiber threads are aligned in parallel in one direction, and a fineness of the reinforcing fiber thread extending in a direction intersecting the reinforcing fiber thread group. The reinforcing fiber base according to any one of claims 1 to 4, which is a unidirectional woven fabric comprising an auxiliary fiber yarn group having 1/5 or less of the fineness. The reinforcing fiber fabric comprises a reinforcing fiber thread group in which reinforcing fiber threads are aligned in parallel in one direction and a reinforcing fiber thread parallel in one direction in a direction intersecting the reinforcing fiber thread group. The reinforcing fiber base according to any one of claims 1 to 4, which is a bi-directional woven fabric composed of a reinforcing fiber yarn group. The reinforcing fiber fabric comprises a reinforcing fiber thread group in which reinforcing fiber threads are aligned in parallel in one direction and a reinforcing fiber thread parallel in one direction in a direction intersecting the reinforcing fiber thread group. The stitch base material is a stitch base integrated with an auxiliary fiber thread group having at least two or more layers laminated with a reinforcing fiber thread group having a fineness of 1⁄5 or less of that of the reinforcing fiber thread group. Reinforcing fiber base material in any one of -4. The reinforced fiber laminated body formed by laminating | stacking two or more reinforcing fiber base materials in any one of Claims 1-9. The reinforced fiber laminate according to claim 10, which is integrated by heat fusion or stitching. A fiber reinforced resin obtained by impregnating the reinforcing fiber base according to any one of claims 1 to 9 or the reinforced fiber laminate according to claims 10 to 11 with a matrix resin. The fiber reinforced resin according to claim 12, wherein the reinforcing fiber volume content is in the range of 53 to 65%, and the normal temperature compression strength after impact application described in SACMA-SRM-2R-94 is 240 MPa or more.