JP2020132741A - Method for producing organic fiber-reinforced plastic - Google Patents

Abstract

To provide a method for producing an organic fiber-reinforced plastic which is less likely to cause interfacial peeling between reinforced fibers and a matrix while using an organic fiber as a reinforced fiber and an amorphous polymer compound as a matrix.SOLUTION: There is provided a method for producing an organic fiber-reinforced plastic comprising a sheet-like matrix (A) and a reinforced organic fiber (B). An amorphous polymer compound (A1) is contained as the sheet-like matrix (A), and a substantially non-twisted crystalline polymer compound fiber (B1) is used as the reinforced organic fiber (B). The method for producing an organic fiber-reinforced plastic includes the steps of: (i) arranging the reinforced organic fibers (B) extending in one direction; and (ii) thermally pressing the sheet-like matrix (A) to the reinforced organic fibers (B).SELECTED DRAWING: None

Description

The present invention relates to a method for producing an organic fiber reinforced plastic.

Fiber reinforced plastics [Fiber Reinforced Plastics (hereinafter, may be abbreviated as FRP)] use reinforced fibers with high elasticity as aggregate, and put the aggregate in a matrix such as plastic to increase the strength. It is an improved composite material. The FRP is used in a wide range of fields such as civil engineering and construction fields, transportation fields, electrical and electronic equipment fields, and aerospace fields, depending on its characteristics.
As reinforcing fibers used for FRP, inorganic fibers such as glass fiber, carbon fiber, metal fiber and ceramic fiber, and organic fiber such as aramid fiber are widely known. Among these, inorganic fiber, particularly glass fiber And carbon fiber is often used. However, inorganic fibers have a problem of difficulty in recycling, and there is a concern about environmental problems because it is necessary to bury FRP at the time of disposal.
Therefore, organic fibers are currently attracting attention as reinforcing fibers. As an FRP using an organic fiber as a reinforcing fiber, an FRP having a combination of polypropylene-based resin fiber and polypropylene-based resin as a combination of reinforcing fiber and matrix (see Patent Document 1) has been known so far.

JP-A-2002-301772

However, as a result of further studies by the present inventor, when organic fibers are used as the reinforcing fibers and an amorphous polymer compound such as a polycarbonate resin is used as the matrix, sometimes the interface between the reinforcing fibers and the matrix is used. It has been found that peeling may occur, which causes deterioration of physical properties.

In view of this situation, the present invention uses organic fibers as reinforcing fibers and an amorphous polymer compound as a matrix, and manufactures an organic fiber reinforced plastic in which interface peeling is unlikely to occur between the reinforcing fibers and the matrix. The purpose is to provide a method.

As a result of intensive research, the present inventor has found that the above problems can be solved by adopting the configuration shown below, and has completed the present invention.
That is, the present invention relates to [1] to [7].
[1] A method for producing a fiber-reinforced plastic containing a sheet-shaped matrix (A) and a reinforced organic fiber (B), wherein the sheet-shaped matrix (A) contains an amorphous polymer compound (A1). Moreover, a substantially untwisted crystalline polymer compound fiber (B1) is used as the reinforced organic fiber (B).
A step [i] of arranging the reinforced organic fiber (B) extending in one direction and a step of thermocompression bonding the sheet-like matrix (A) to the reinforced organic fiber (B) [ii].
A method for manufacturing organic fiber reinforced plastics.
[2] The crystalline polymer compound fiber (B1) is selected from the group consisting of polyester fiber, polyethylene fiber, polypropylene fiber, cellulose fiber, polyamide fiber, polyacetal fiber, polyphenylene sulfide fiber and polyether ether ketone fiber. The method for producing an organic fiber reinforced plastic according to the above [1], which uses at least one of the above.
[3] The crystalline polymer compound fiber (B1) is selected from the group consisting of polyethylene terephthalate fiber, polytrimethylene terephthalate fiber, polybutylene terephthalate fiber, polyethylene naphthalate fiber, polybutylene naphthalate fiber and polyarylate fiber. The method for producing an organic fiber reinforced plastic according to the above [1] or [2], which uses at least one polyester fiber.
[4] The method for producing an organic fiber reinforced plastic according to any one of the above [1] to [3], wherein the crystalline polymer compound fiber (B1) has an average fiber diameter of 3 to 500 μm.
[5] The method for producing an organic fiber reinforced plastic according to any one of the above [1] to [4], wherein the crystalline polymer compound fiber (B1) is substantially unentangled.
[6] As the amorphous polymer compound (A1), polycarbonate (PC), polyarylate (PAR), polystyrene (PS), polymethylmethacrylate (PMMA), acryliconitrile-butadiene-styrene copolymer (ABS). , Modified polyphenylene ether (m-PPE), polyethersulfone (PES), polyetherimide (PEI) and polyamideimide (PAI), at least one selected from the group used above [1] to [5]. The method for producing an organic fiber reinforced plastic according to any one of.
[7] In the step [ii], thermocompression bonding is performed at a temperature equal to or higher than the softening point of the sheet-like matrix (A) and lower than the melting point of the reinforced organic fiber (B), according to the above [1] to [6]. The method for producing an organic fiber reinforced plastic according to any one of.

According to the present invention, it is possible to provide a method for producing an organic fiber reinforced plastic in which interfacial peeling is unlikely to occur between the reinforcing fiber and the matrix while using an organic fiber as the reinforcing fiber and an amorphous polymer compound as the matrix. Can be done.

It is a schematic diagram of an example which shows the aspect which has the part where the reinforcing organic fiber (B) used in this embodiment extends substantially parallel in one direction, and is arranged.

Hereinafter, preferred embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments.

[Manufacturing method of organic fiber reinforced plastic]
The present embodiment is a method for producing a fiber-reinforced plastic containing a sheet-like matrix (A) and a reinforced organic fiber (B), wherein the sheet-like matrix (A) is an amorphous polymer compound (A1). As the reinforced organic fiber (B), a substantially untwisted crystalline polymer compound fiber (B1) is used.
A step of arranging the reinforced organic fiber (B) extending in one direction [i] and a step of thermocompression bonding the sheet-like matrix (A) to the reinforced organic fiber (B) [ii].
It is a manufacturing method of an organic fiber reinforced plastic having.

Since the reinforced organic fiber plastic obtained by the present embodiment is unlikely to peel off at the interface between the reinforced organic fiber and the matrix and tends to maintain its physical properties for a long period of time, the reinforced organic fiber plastic can be used in a wide range of applications. It is available.
Hereinafter, the present embodiment will be described in detail.

(Sheet matrix (A))
In this embodiment, the sheet matrix (A) contains an amorphous polymer compound (A1).
Examples of the amorphous polymer compound (A1) include polycarbonate (PC), polyarylate (PAR), polystyrene (PS), polymethylmethacrylate (PMMA), acryliconitrile-butadiene-styrene copolymer (ABS), and the like. It is preferable to use at least one selected from the group consisting of modified polyphenylene ether (m-PPE), polyethersulfone (PES), polyetherimide (PEI) and polyamideimide (PAI). Among these, it is more preferable to use at least one selected from the group consisting of polycarbonate (PC) and polyarylate (PAR), and from the viewpoint of mechanical strength, heat resistance, dimensional stability and flame retardancy, polycarbonate ( It is more preferable to use PC). The polycarbonate (PC) will be described in detail below.

-Polycarbonate (PC)-
The polycarbonate (PC) is not particularly limited as long as it has a carbonate bond in the main chain, and examples thereof include aromatic polycarbonate, aliphatic polycarbonate, and aromatic-aliphatic polycarbonate, and the polycarbonate (PC) is selected from the group consisting of these. It is preferably at least one type.
Polycarbonate is obtained, for example, by a method of transesterifying a dihydroxy compound and a carbonic acid diester, or a method of intercondensing a dihydroxy compound and phosgene in the presence of an alkaline catalyst. A typical example is a polycarbonate resin produced from 2,2-bis (4-hydroxyphenyl) propane (commonly known as bisphenol A).

The dihydroxy compound may be a compound having two hydroxy groups in the molecule, and may be bisphenol A, 2,2-bis (3,5-dibromo-4-hydroxyphenyl) propane, or 2,2-bis (4). -Hydroxyphenyl-3-methylphenyl) propane, 2,2-bis (3-tert-butyl-4-hydroxyphenyl) propane, 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane, bis Aromatic dihydroxy compounds such as (4-hydroxyphenyl) methane, 1,1-bis (p-hydroxyphenyl) ethane, 2,2-bis (p-hydroxyphenyl) butane; ethylene glycol, 1,2-propylene glycol, Examples thereof include aliphatic dihydroxy compounds such as 3-methyl-1,5-pentanediol, 1,6-hexanediol, 1,3-propanediol, and 1,4-butanediol.
One of these dihydroxy compounds may be used alone, or two or more thereof may be used in combination.
In addition to the dihydroxy compound, the polycarbonate may contain a structural unit derived from a monohydroxy compound, a trihydroxy compound, or the like.

The weight average molecular weight of the polycarbonate is not particularly limited, but is preferably 10,000 to 100,000, more preferably 20,000 to 70,000, and 30,000 to 50,000 from the viewpoint of moldability. Is even more preferable. The weight average molecular weight in the present specification is a value measured by a gel permeation chromatography (GPC) method (standard polystyrene conversion) using tetrahydrofuran as an eluent.
The melt volume flow rate (MVR) (measurement 300 ° C., load 11.8 N) of polycarbonate is not particularly limited, but is preferably ³ to 15 cm 3/10 min from the viewpoint of moldability. The melt volume flow rate of polycarbonate is a value measured in accordance with ISO 1133.
The softening point of the polycarbonate is not particularly limited, but from the viewpoint of moldability, it is preferably 100 to 180 ° C, more preferably 140 to 170 ° C, and even more preferably 150 to 160 ° C. The softening point of polycarbonate is a value measured in accordance with ISO 306 (B50 method).

(Other ingredients)
The sheet-shaped matrix (A) can contain various additives, if necessary, as long as the effects of the present invention are not impaired. Additives include lubricants, shrinkage inhibitors, fillers, flame retardants, bubble nucleating agents, crystal nucleating agents, plasticizers, pigments, antioxidants, UV absorbers, antiaging agents, reinforcing agents, shrinkage inhibitors, antistatic agents. Examples thereof include an inhibitor, a surfactant, a vulcanizing agent, a surface treatment agent, a cross-linking agent, and a polytetrafluoroethylene resin for preventing dropping.

Further, the sheet-like matrix (A) may further contain various resins (however, the amorphous polymer compound (A1) is excluded).
Examples of the various resins include high-impact polystyrene resin, acrylonitrile-butadiene-styrene copolymer resin (ABS resin), acrylonitrile- (ethylene / propylene / diene) -styrene copolymer resin (AES resin), and acrylonitrile-acrylic acid ester. Examples thereof include -styrene copolymer resin (AAS resin), acrylonitrile-styrene copolymer resin (AS resin), acrylic resin, polyacetal, polyamide, polyethylene terephthalate, polybutylene terephthalate, polyarylate, polysulfone, and polyphenylene sulfide. One of these may be used alone, or two or more thereof may be used in combination.
When the sheet-shaped matrix (A) contains the various resins, the content thereof is based on 100 parts by mass of the sheet-shaped matrix (A) from the viewpoints of mechanical strength, heat resistance, dimensional stability and flame retardancy. It is preferably 50 parts by mass or less, more preferably 30 parts by mass or less, still more preferably 10 parts by mass or less, and particularly preferably 3 parts by mass or less. Further, the various resins may not be contained in the organic fiber reinforced plastic of the present embodiment.

(Reinforced organic fiber (B))
In the present embodiment, the reinforced organic fiber (B) is referred to as a substantially untwisted crystalline polymer compound fiber (B1) [hereinafter, simply referred to as a crystalline polymer compound fiber (B1). ] Is used. Generally, the reinforcing fibers are surface-treated in order to suppress the interfacial peeling, but according to the method for producing an organic fiber-reinforced plastic of the present embodiment, even if the reinforcing organic fibers (B) are not surface-treated. However, interfacial peeling is effectively suppressed.

The average fiber diameter of the reinforced organic fiber (B) is not particularly limited, but from the viewpoint of ease of impregnation of the sheet-like matrix (A), it is preferably 3 to 500 μm, more preferably 5 to 100 μm, and further preferably 10 to 10. It is 50 μm. Further, as will be described later, the reinforcing organic fiber (B) may be a fiber bundle in which a plurality of single fibers (referring to each fiber) are bundled.

The reinforced organic fiber (B) is preferably a fiber bundle in which a plurality of single fibers are bundled (with a bundling material if necessary), and when the single fiber is bundled with a bundling material, it is necessary. The fiber bundle may be at least partially opened. Further, as the reinforced organic fiber (B), a substantially untwisted crystalline polymer compound fiber (B1) is used. Further, it is preferable to use the crystalline polymer compound fiber (B1) which is substantially unentangled. By using such a crystalline polymer compound fiber (B1), the reinforced organic fiber (B) can be easily impregnated with the sheet-like matrix (A).
Here, substantially no twist means a state in which no twist other than an unintended twist due to unwinding or the like is included, and the number of twists is 10 turns / m or less, preferably 5 turns / m. Hereinafter, it is more preferably 1 turn / m or less. In addition, substantially non-confounding means a state in which intentional entanglement by ordinary entanglement means such as fluid entanglement is the minimum number of times to maintain handleability, and the number of entanglements is 5 times / m or less. It is preferably 3 times / m or less.
When at least a part of the fiber bundle is opened, the thickness is not particularly limited, but for example, the thickness is preferably 50 to 150 μm, more preferably 60 to 120 μm, and the width is preferably 2 to 2. The fiber bundle is preferably 6 mm, more preferably 3 to 5 mm. Further, although not particularly limited, a mode in which 100 to 300 single fibers are present within the range of the thickness and the width is preferable, and a mode in which 150 to 280 single fibers are present is more preferable. It is preferable that 230 to 280 single fibers are present, which is more preferable.

The crystalline polymer compound fiber (B1) used in the present embodiment has excellent rigidity and is a portion extending in one direction (preferably substantially parallel) (the portion is layered). By having (may be good), it is easy to impregnate the sheet-like matrix (A). Here, the fact that "they are arranged so as to extend in one direction (preferably substantially parallel)" does not include the aspect of being woven vertically and horizontally as in the case of plain weave. Further, in terms of being "extended and arranged", the reinforced organic fiber plastic obtained in the present embodiment is formed by melt-kneading short fibers as reinforcing fibers and a thermoplastic resin as a matrix to form a compound. The structure and physical properties are both different from those of fiber reinforced plastics produced afterwards.
The crystalline polymer compound fiber (B1) may have a single layer or two or more layers.
In addition, in this specification, the term "substantially parallel" means including a state of being completely parallel and a state of being substantially parallel even if not completely parallel. In addition, it shows a state that can be said to be approximately parallel as a whole, and even if there are places that are not parallel to the details, if they are macroscopically parallel, they are included in "approximately parallel".

In the crystalline polymer compound fiber (B1) in the reinforced organic fiber plastic obtained in the present embodiment, for example, as shown in FIG. 1, a plurality of single fibers or a plurality of the fiber bundles extend substantially in parallel in one direction. A certain layer (A1 layer) that is presently arranged and the same layer as the A1 layer (A2 layer) are prepared, and the direction is changed from the A1 layer (preferably by changing the direction at 90 ° C.) on the A1 layer. A mode in which the A2 layer is laminated on the surface and a mode in which the A2 layer is repeated are also preferable, and a mode in which a plurality of the laminated bodies thus obtained are prepared and further laminated are also preferable.

The crystalline polymer compound fiber (B1) is selected from the group consisting of, for example, polyester fiber, polyethylene fiber, polypropylene fiber, cellulose fiber, polyamide fiber, polyacetal fiber, polyphenylene sulfide fiber and polyether ether ketone fiber. It is preferable to use at least one of these. Among these, polyester fibers are more preferable from the viewpoint of preventing interfacial peeling between the reinforced organic fibers and the matrix, and in particular, when the sheet-like matrix (A) is made of polycarbonate (PC), a crystalline polymer is used. By using the polyester fiber as the compound fiber (B1), there is a great tendency that interfacial peeling between the reinforced organic fiber and the matrix is less likely to occur. The polyester fiber will be described in detail below.

-Polyester fiber-
The polyester fiber is not particularly limited as long as it has an ester bond in the main chain, and a known polyester can be used. Specific examples of the polyester fiber include polyethylene terephthalate fiber, polytrimethylene terephthalate fiber, polybutylene terephthalate fiber, polyethylene naphthalate fiber, polybutylene naphthalate fiber, polyarylate fiber and the like, and the polyester fiber is selected from the group consisting of these. It is preferable that it is at least one kind. From these, polyethylene terephthalate fiber may be selected from the viewpoint of processability, or polyarylate fiber may be selected from the viewpoint of high strength.

The polyarylate fiber is preferably one whose constituent component is mainly composed of an aromatic compound (total aromatic polyester fiber), and preferably contains a structural unit represented by the following general formula (b).

(In the above formula (b), Ar represents an aromatic hydrocarbon group.)

As the aromatic hydrocarbon group represented by Ar in the general formula (b), an aromatic hydrocarbon group having 6 to 20 carbon atoms is preferable, an aromatic hydrocarbon group having 6 to 14 carbon atoms is more preferable, and a phenylene group, Examples thereof include a naphthylene group, an anthrylene group, and a phenanthrylene group. Among these, a phenylene group and a naphthylene group are preferable.

Further, the polyarylate fiber preferably contains a structural unit represented by the following general formula (b1) and a structural unit represented by the following general formula (b2).

<Amount of sheet matrix (A) and reinforced organic fiber (B) used>
The amounts of the sheet-like matrix (A) and the reinforced organic fiber (B) used in the present embodiment are not particularly limited, but from the viewpoints of rigidity, mechanical strength, heat resistance, dimensional stability and flame retardancy. Therefore, the content ratio of the reinforced organic fiber (B) to the sheet-like matrix (A) [reinforced organic fiber (B) / sheet-like matrix (A)] is preferably 15/85 to 60/40 in terms of mass ratio. It is preferably 20/80 to 60/40, more preferably 25/75 to 50/50.

The thickness of the organic fiber reinforced plastic obtained in the present embodiment is not particularly limited and may be appropriately adjusted according to the intended use, but may be, for example, 0.05 to 5 mm, or 0.1 to 0.1. It can be 3 mm, 0.3 to 2.0 mm, or 0.5 to 1.5 mm.
The specific gravity of the organic fiber-reinforced plastic of the present embodiment is not particularly limited, tend to be 1.1~1.4g / cm ^3, it is also the 1.1~1.3g / cm ³ obtain.

(Manufacturing method of organic fiber reinforced plastic)
In the method for producing an organic fiber reinforced plastic of the present embodiment, as described above, the step [i] of arranging the reinforced organic fiber (B) extending in one direction and the sheet-like matrix (A) are arranged in the reinforced organic. It has a step [ii] of thermocompression bonding to the fiber (B).
The method for producing an organic fiber reinforced plastic of the present embodiment preferably has a cooling step [iii] after the step [ii]. Further, the method for producing an organic fiber reinforced plastic of the present embodiment (particularly step [ii]) is preferably carried out in a vacuum environment from the viewpoint of easiness of impregnating the reinforced organic fiber of the matrix.
The method for producing the organic fiber reinforced plastic of the present embodiment does not include a step of substantially twisting the reinforced organic fiber (B) from the viewpoint of easiness of impregnating the reinforced organic fiber of the matrix.
The materials used in the method for producing the organic fiber reinforced plastic of the present embodiment are as described above. Hereinafter, each step will be described in detail.

(Step [i])
Step [i] is a step of arranging the reinforced organic fibers (B) extending in one direction (preferably substantially in parallel). A single fiber obtained from a crystalline polymer compound which is a material of the reinforced organic fiber (B) or a fiber bundle formed from the single fiber without twisting is spread in one direction (preferably substantially parallel) without twisting. It may be present and placed. Since the fiber bundle may be adhered with a bundling material, at least a part of the fiber bundle may be opened as necessary and then extended and arranged in one direction (preferably substantially parallel) without twisting. May be good.
Commercially available reinforced organic fiber (B) may be used, and examples of commercially available products include Bectran (registered trademark) (manufactured by Kuraray Industries, Inc.), Zexion (registered trademark) (manufactured by KB Salen Co., Ltd.), and Tetron (manufactured by KB Salen Co., Ltd.). Polyester fiber such as (registered trademark) (manufactured by Toray Industries, Inc.), Soluna (registered trademark) (manufactured by Mitsubishi Chemical Co., Ltd.); polyethylene fiber such as Isanas (registered trademark) (manufactured by Toyo Spinning Co., Ltd.); Toray Nylon (registered trademark) Polyphenylene fibers such as (Toray Industries, Inc.); polyphenylene sulfide fibers such as Torcon (registered trademark) (Toray Industries, Inc.) and Procon (registered trademark) (manufactured by Toyo Spinning Co., Ltd.) can be mentioned.

(Step [ii])
The step [ii] is a step of thermocompression bonding the sheet-shaped matrix (A) to the reinforced organic fiber (B). Thermocompression bonding may be performed by a vacuum press or by a heating and pressurizing roller.
The heating temperature is preferably a temperature at which the sheet-like matrix (A) has a viscosity that allows impregnation and a temperature at which the reinforced organic fiber (B) does not melt. That is, it is preferable that thermocompression bonding is performed at a temperature equal to or higher than the softening point of the sheet-shaped matrix (A) and lower than the melting point of the reinforced organic fiber (B).
For example, when polycarbonate is used as the sheet matrix (A), the heating temperature is preferably 150 to 220 ° C, more preferably 160 to 200 ° C, and even more preferably 170 to 200 ° C. The pressurizing conditions are preferably 1 to 10 MPa, more preferably 2 to 8 MPa, and even more preferably 3 to 8 MPa.

(Step [iii])
The step [iii] is a step of obtaining an organic fiber reinforced plastic by cooling after the step [ii], and it is preferable to go through the step [iii].
The cooling temperature is not particularly limited as long as it is the temperature at which the molten matrix solidifies, and may be appropriately adjusted. However, usually, it is preferably 40 ° C. or lower, more preferably 0 to 30 ° C., and further preferably 10 to 30 ° C. ℃.
As described above, the organic fiber reinforced plastic of the present embodiment can be produced.

(Process [iv])
Further, the organic fiber reinforced plastic obtained as described above and the sheet-like matrix (A) are alternately laminated, preferably heated and pressurized under vacuum, and then cooled to increase the thickness. Organic fiber reinforced plastics can be manufactured.
As the heating temperature, the heating temperature in the step [ii] can be adopted. Further, as the pressurizing condition, the pressurizing condition of the step [ii] can be adopted, but it is preferably 1 to 6 MPa, more preferably 2 to 4 MPa.
As the cooling temperature, the cooling temperature of step [iii] can be adopted.

(Use)
The organic fiber reinforced plastic obtained in the present embodiment is excellent in rigidity, mechanical strength, heat resistance, dimensional stability and flame retardancy, and interface peeling is unlikely to occur between the reinforced organic fiber and the matrix. , The above characteristics can be maintained for a long period of time. Therefore, the organic fiber reinforced plastic of the present embodiment is useful as a reinforcing product such as an artificial hand and a prosthetic leg; an auxiliary product such as an inner sole of shoes; and a part of a robot such as an auxiliary robot.

Hereinafter, the present invention will be described in more detail based on Examples and Comparative Examples. However, the present invention is not limited to the following examples.
The measurement method of each characteristic in each example is as follows.

[1. Observation of interfacial peeling]
After bending the organic fiber reinforced plastic obtained in each example by 180 degrees, the cross section of the organic fiber reinforced plastic is cut and the interface between the fiber and the matrix is observed with an optical microscope (magnification: 400 times), and the following evaluation criteria are followed. evaluated.
A: No peeling was observed.
C: Peeling was observed.

[2. Measurement of tensile strength and tensile modulus]
The bending strength of the organic fiber reinforced plastic was evaluated by a three-point bending test using "Autograph (registered trademark) AG-50kNXPlus" (manufactured by Shimadzu Corporation, trade name). Using a test piece having a width of 10 mm and a thickness of 1.5 mm, the measurement was performed at a distance between fulcrums of 25 mm and a test speed of 1 mm / min.

[3. Measurement of bending strength and flexural modulus]
The bending strength of the organic fiber reinforced plastic was evaluated by a three-point bending test using "Autograph (registered trademark) AG-50kNXPlus" (manufactured by Shimadzu Corporation, trade name). Using a 130 mm × 13 mm × 3 mm test piece, the measurement was performed at a distance between fulcrums of 48 mm and a test speed of 1 mm / min.

[4. Measurement of specific gravity of organic fiber reinforced plastic]
The specific gravity of the organic fiber reinforced plastic was measured using an electronic hydrometer MDS-300 (underwater replacement type) (manufactured by Alpha Mirage Co., Ltd.).

Example 1 (Preparation of organic fiber reinforced plastic; substantially untwisted polyarylate fiber / sheet-like polycarbonate matrix)
(Step [i])
Polyarylate fiber ("Vectran (registered trademark) HT" manufactured by Kuraray Co., Ltd., single fiber with an average fiber diameter of 24 μm) on a 15 cm square polycarbonate sheet (thickness: 100 μm, weight average molecular weight 40,000, manufactured by AGC Inc.) 260 fiber bundles. Fiber bundle thickness: 70 to 100 μm, fiber bundle width: 3 to 4 mm, substantially untwisted and substantially unentangled fiber bundle) extending in one direction. After arranging and placing the sample on the hot plate of the vacuum press at room temperature and pressurizing at 1 to 2 MPa to lightly fix the sample, the depressurization in the vacuum press was started.
(Steps [ii] to [iii])
After evacuating the inside of the vacuum press machine, the press pressure was raised to 5 MPa, and the temperature rise of the hot plate was started at a temperature rise rate of 20 ° C./min. After reaching 190 ° C., the polycarbonate sheet was held for 30 minutes and thermocompression bonded to a substantially untwisted polyarylate fiber. Then, the mixture was cooled to room temperature while maintaining the vacuum and press pressure in the vacuum press machine. The thickness of the organic fiber reinforced plastic a thus obtained was about 200 μm. With respect to the obtained organic fiber reinforced plastic a, the presence or absence of interfacial peeling was observed according to the above evaluation method. The results are shown in Table 1.
(Process [iv])
Next, a total of 7 polycarbonate sheets (thickness: 100 μm, weight average molecular weight 40,000, manufactured by AGC Inc.) and a total of 6 organic fiber reinforced plastics a are alternately arranged one by one so that the outermost layer is a polycarbonate sheet. After laminating on a hot plate of a vacuum press machine, the sample was lightly fixed by pressurizing at 1 to 2 MPa, and then the depressurization in the press machine was started. After creating a vacuum, the press pressure was raised to 3 MPa, and the temperature rise of the hot plate was started at a temperature rise rate of 20 ° C./min. After reaching 180 ° C., it was held for 10 minutes. Then, while maintaining the vacuum and the press pressure in the press machine, the mixture was cooled to room temperature to obtain an organic fiber reinforced plastic A. The thickness of the organic fiber reinforced plastic A thus obtained was about 1.3 mm. Each evaluation (excluding the presence or absence of interfacial peeling) was performed on the organic fiber reinforced plastic A according to the above method. The results are shown in Table 1.

Comparative Example 1 (Preparation of Organic Fiber Reinforced Plastic; Plain Weave Polyarylate Fiber / Sheet Polycarbonate Matrix)
In Example 1, instead of arranging the polyarylate fibers in one direction, the organic fiber reinforced plastic b and the organic fiber reinforced plastic B were prepared in the same manner except that the plain weave polyarylate fibers were laid, and each evaluation was performed. It was. The results are shown in Table 1.

From Table 1, the organic fiber reinforced plastic produced by the method of Example 1 does not peel off at the interface between the sheet-like matrix (A) and the reinforced organic fiber (B), and has tensile strength, tensile elastic modulus, and bending strength. And the flexural modulus was high.
On the other hand, in Comparative Example 1 in which plain woven polyarylate was used as the reinforcing organic fiber (B) with respect to the polycarbonate sheet which is the sheet-like matrix (A), the tensile strength, the tensile elastic modulus, the bending strength and the bending elastic modulus decreased. Moreover, since peeling was observed at the interface between the sheet-like matrix (A) and the reinforced organic fiber (B), it can be said that it cannot withstand long-term use.

Claims (7)

A method for producing a fiber-reinforced plastic containing a sheet-like matrix (A) and a reinforced organic fiber (B), wherein the sheet-like matrix (A) contains an amorphous polymer compound (A1) and , A substantially untwisted crystalline polymer compound fiber (B1) was used as the reinforced organic fiber (B).
A step of arranging the reinforced organic fiber (B) extending in one direction [i] and a step of thermocompression bonding the sheet-like matrix (A) to the reinforced organic fiber (B) [ii].
A method for manufacturing organic fiber reinforced plastics. As the crystalline polymer compound fiber (B1), at least one selected from the group consisting of polyester fiber, polyethylene fiber, polypropylene fiber, cellulose fiber, polyamide fiber, polyacetal fiber, polyphenylene sulfide fiber and polyether ether ketone fiber. The method for producing an organic fiber reinforced plastic according to claim 1, using seeds. As the crystalline polymer compound fiber (B1), at least one selected from the group consisting of polyethylene terephthalate fiber, polytrimethylene terephthalate fiber, polybutylene terephthalate fiber, polyethylene naphthalate fiber, polybutylene naphthalate fiber and polyarylate fiber. The method for producing an organic fiber reinforced plastic according to claim 1 or 2, wherein the polyester fiber of the seed is used. The method for producing an organic fiber reinforced plastic according to any one of claims 1 to 3, wherein the crystalline polymer compound fiber (B1) has an average fiber diameter of 3 to 500 μm. The method for producing an organic fiber reinforced plastic according to any one of claims 1 to 4, wherein the crystalline polymer compound fiber (B1) is substantially unentangled. The amorphous polymer compound (A1) is polycarbonate (PC), polyarylate (PAR), polystyrene (PS), polymethylmethacrylate (PMMA), acryliconitrile-butadiene-styrene copolymer (ABS), modified polyphenylene. The item according to any one of claims 1 to 5, which is at least one selected from the group consisting of ether (m-PPE), polyethersulfone (PES), polyetherimide (PEI) and polyamideimide (PAI). The method for producing an organic fiber reinforced plastic described. According to any one of claims 1 to 6, in the step [ii], thermocompression bonding is performed at a temperature equal to or higher than the softening point of the sheet-like matrix (A) and lower than the melting point of the reinforced organic fiber (B). The method for producing an organic fiber reinforced plastic described.