KR102663419B1 - Transparent thermoplastic resin composite reinforced with carbon fiber and method for preparing the same - Google Patents

Abstract

The present invention relates to a carbon fiber-reinforced transparent thermoplastic resin composite and a manufacturing method thereof, and more specifically, to chips of a thermoplastic resin composition containing a specific content of carbon fiber and a thermoplastic resin impregnated in the carbon fiber. The present invention relates to a carbon fiber-reinforced transparent thermoplastic resin composite obtained by thermoforming, having a surface shape of a black marble pattern and excellent formability, impact properties, and gloss, and a method for manufacturing the same.

Description

Transparent thermoplastic resin composite reinforced with carbon fiber and method for preparing the same}

The present invention relates to a carbon fiber-reinforced transparent thermoplastic resin composite and a manufacturing method thereof, and more specifically, to chips of a thermoplastic resin composition containing a specific content of carbon fiber and a thermoplastic resin impregnated in the carbon fiber. The present invention relates to a carbon fiber-reinforced transparent thermoplastic resin composite obtained by thermoforming, having a surface shape of a black marble pattern and excellent formability, impact properties, and gloss, and a method for manufacturing the same.

Carbon fiber-reinforced composites are materials in which a matrix is impregnated with carbon fiber, which is a reinforcement, and have excellent mechanical properties of light weight, high strength, and high elasticity, and are applied and utilized in various fields. Currently, carbon fiber prepregs containing a matrix resin and a carbon fiber bundle containing multiple carbon fiber single yarns are being manufactured and sold. These prepregs are largely divided into thermosetting composite materials and thermoplastic composite materials depending on the matrix resin used.

In the case of carbon fiber-reinforced prepreg, there is a problem that it is difficult to handle due to the fluidity problem of thermoplastic composite type resin compared to thermosetting composite type resin, so the prepreg currently available on the market is carbon fiber-reinforced prepreg containing thermosetting resin. Most of them are. However, as eco-friendly issues and mass production processes emerge, the development of thermoplastic composite material types is steadily taking place.

In addition, most commercially available prepregs have carbon fiber bundles aligned in one direction or are fabric-type thermosetting continuous fiber prepregs. Consumer demand for aesthetically pleasing prepregs with unique surface patterns, rather than prepregs of this general shape, continues to increase. At the same time, in the case of prepregs aligned in one direction, when molding products with complex structures, angled parts such as corners are not perfectly realized and are manufactured in a bent shape, which reduces the formability of complex structural products and leads to defects in parts. .

Therefore, it is a lightweight material, has sufficient physical strength and gloss, has improved moldability to the extent that complex molded products can be manufactured, has a unique pattern and excellent aesthetics that are not found in previous prepreg products, and is economical due to the simple manufacturing process. There is a need for development of fiber-reinforced composites.

The purpose of the present invention is to realize the unique aesthetics of carbon fiber, have a surface shape of a unique black marble pattern, have excellent formability, impact properties and gloss, and reduce the weight of the product due to low specific gravity. The object is to provide a possible carbon fiber-reinforced transparent thermoplastic resin composite and a method for manufacturing the same.

In order to solve the above technical problem, the present invention is obtained by thermoforming chips of a thermoplastic resin composition containing carbon fiber and a thermoplastic resin impregnated with the carbon fiber, and the carbon fiber content in the thermoplastic resin composition is , based on the total volume of the thermoplastic resin composition, provides a carbon fiber-reinforced composite material, which is 19 to 72% by volume.

According to another aspect of the present invention, (1) impregnating carbon fibers aligned in one direction with a thermoplastic resin to prepare a thermoplastic resin composition having a carbon fiber content of 19 to 72% by volume; (2) cutting the thermoplastic resin composition to form a chip; and (3) thermoforming the manufactured chips. A method of manufacturing a carbon fiber-reinforced composite material is provided, including a step.

The carbon fiber-reinforced composite material according to the present invention can realize the unique aesthetics of carbon fiber, has a surface shape of a unique black marble pattern, has excellent formability, impact properties, and gloss, and has a low specific gravity. , In particular, it can be applied to complex vehicle interior and exterior materials and various parts that require weight reduction.

Figure 1 is a photograph of the exterior of a carbon fiber-reinforced composite material (prepreg) showing a black marble pattern of the carbon fiber-reinforced composite material (prepreg) manufactured in Example 1 of the present invention.
Figure 2 is a photograph of the appearance of a typical prepreg containing carbon fibers aligned in one direction (unidirection).

Hereinafter, the present invention will be described in more detail.

The carbon fiber-reinforced composite of the present invention includes a thermoplastic resin.

In one embodiment, the thermoplastic resin is polycarbonate (PC) resin, styrene-acrylonitrile (SAN) resin, polymethylmethacrylate (PMMA) resin, acrylonitrile-butadiene- It may be selected from styrene (acrylonitrile-butadiene-styrene, ABS) resin, and combinations thereof.

In one embodiment, the viscosity average molecular weight of the thermoplastic resin may be 15,000 to 50,000, and more specifically, 16,000 to 30,000.

In one embodiment, when polycarbonate resin is used as the thermoplastic resin, thermoplastic aromatic polycarbonate resin commonly used in the art may be used.

In one embodiment, the aromatic polycarbonate resin may be prepared from dihydric phenols, carbonate precursors, molecular weight regulators, etc. The dihydric phenol is one of the monomers constituting the aromatic polycarbonate resin, and may be represented by the following chemical formula.

In the above formula,

X is a straight, branched or cyclic alkylene group without a functional group; Or it represents a straight, branched or cyclic alkylene group containing one or more functional groups selected from the group consisting of sulfide group, ether group, sulfoxide group, sulfone group, ketone group, naphthyl group and isobutylphenyl group. Preferably,

R ₁ and R ₂ each independently represent a halogen atom or an alkyl group (e.g., a straight alkyl group having 1 to 20 carbon atoms, a branched alkyl group having 3 to 20 carbon atoms, or a cyclic alkyl group having 3 to 20 carbon atoms (preferably, 3 to 6 carbon atoms). represents,

n and m each independently represent an integer from 0 to 4.

Non-limiting examples of the dihydric phenols include bis(4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)phenylmethane, bis(4-hydroxyphenyl)naphthylmethane, and bis(4-hydroxyphenyl). Phenyl)-(4-isobutylphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 1-ethyl-1,1-bis(4-hydroxyphenyl)propane, 1-phenyl-1, 1-bis(4-hydroxyphenyl)ethane, 1-naphthyl-1,1-bis(4-hydroxyphenyl)ethane, 1,2-bis(4-hydroxyphenyl)ethane, 1,10-bis (4-hydroxyphenyl)decane, 2-methyl-1,1-bis(4-hydroxyphenyl)propane, and 2,2-bis(4-hydroxyphenyl)propane (bisphenol A), etc., Preferably, bisphenol A can be used.

The carbonate precursor is another monomer constituting the aromatic polycarbonate resin, and non-limiting examples thereof include carbonyl chloride (phosgene), carbonyl bromide, bihaloformate, diphenyl carbonate, and dimethyl carbonate. there is. Preferably, carbonyl chloride (phosgene) can be used.

The molecular weight regulator may be a material already known in the art, that is, a monofunctional compound similar to a monomer used in the production of thermoplastic aromatic polycarbonate resin. Non-limiting examples of the molecular weight regulator include phenol-based derivatives (e.g., para-isopropylphenol, para-tert-butylphenol (PTBP), para-cumyl phenol, para-isooctylphenol, para-isononylphenol, etc.) and aliphatic alcohols. Preferably, para-tert-butylphenol (PTBP) can be used.

Aromatic polycarbonate resins prepared from such dihydric phenols, carbonate precursors, and molecular weight regulators include, for example, linear polycarbonate resins, branched polycarbonate resins, copolycarbonate resins, or polyester carbonate resins alone. Alternatively, two or more types can be mixed and used.

The preferred viscosity average molecular weight (Mv, when measured in a methylene chloride solution) of the aromatic polycarbonate resin may be 15,000 to 40,000, more preferably 17,000 to 30,000, and most preferably 20,000 to 30,000.

The carbon fiber-reinforced composite of the present invention also includes carbon fiber.

The carbon fibers included in the carbon fiber-reinforced composite material of the present invention are in the form of fibers rather than single fibers (e.g., fibers less than 1 mm in length), and are obtained by impregnating the carbon fibers with a thermoplastic resin, and the carbon fibers. Carbon fiber is included in a carbon fiber-reinforced composite material obtained by thermoforming chips obtained by cutting a thermoplastic resin composition containing a thermoplastic resin impregnated with . Accordingly, the length of the carbon fiber included in the carbon fiber-reinforced composite material of the present invention corresponds to the standard (eg, length or width) of the cut chip.

In the present invention, the content of carbon fiber contained in the thermoplastic resin composition containing the carbon fiber and the thermoplastic resin impregnated with the carbon fiber, that is, contained in the carbon fiber-reinforced composite material of the present invention, is the composition (or composite) Based on total volume, it ranges from 19 to 72% by volume. If the carbon fiber content in the composition (or composite) is less than 19% by volume, the mechanical properties become poor, and conversely, if the carbon fiber content exceeds 72% by volume, the resin does not properly serve as a base material for the fiber, making it difficult to manufacture the composite material. , physical properties may deteriorate.

In one embodiment, the carbon fiber content in the composition (or composite) is 19 vol% or more, 20 vol% or more, 25 vol% or more, 30 vol% or more, 35 vol% or more, 40 vol% or more, 45 vol% or more. Alternatively, it may be 50 volume% or more, and may also be 72 volume% or less, 70 volume% or less, 65 volume% or less, 60 volume% or less, or 55 volume% or less.

In one embodiment, the carbon fiber may be surface-treated carbon fiber.

In one embodiment, the surface-treated carbon fiber may be surface-treated with a surface treatment agent including a silane-based polymer, titanate-based polymer, polyamide-based polymer, polyurethane-based polymer, or a combination thereof. When a plurality of surface treatment agents are used, at least one of them is preferably a surface treatment agent that has good affinity with the thermoplastic resin used in the carbon fiber-reinforced thermoplastic resin composition.

In one embodiment, the surface-treated carbon fiber may include 0.1 to 10 parts by weight of a surface treatment agent based on 100 parts by weight of carbon fiber, more specifically, 0.5 to 8 parts by weight, or 1 to 5 parts by weight. It may contain a surface treatment agent.

Surface treatment of carbon fibers can be performed by continuously impregnating the carbon fibers with a surface treatment agent by various known methods, such as, for example, melt impregnation method and powder charging method.

In addition to the above components, the carbon fiber-reinforced composite material of the present invention may further include, if necessary, one or more additives that are usually included in thermoplastic resin compositions for, for example, interior and exterior materials. Examples of such additives include, but are not limited to, heat stabilizers, antioxidants, and light resistance additives.

The carbon fiber-reinforced composite material of the present invention is obtained by thermoforming chips of a thermoplastic resin composition comprising carbon fiber and a thermoplastic resin impregnated with the carbon fiber, and optionally further containing one or more additives.

In one embodiment, the length of the chip of the thermoplastic resin composition may be 1 to 80 mm, more specifically 3 to 60 mm, and even more specifically 5 to 50 mm. If the length of the chip of the thermoplastic resin composition is shorter than the above-mentioned level, the properties of the carbon fiber may be reduced, which may lower the mechanical properties of the composite material. Conversely, if the chip length is longer than the above-mentioned level, the formability may be reduced.

In one embodiment, the width of the chip of the thermoplastic resin composition may be 1.5 to 25 mm, more specifically 3 to 20 mm, and even more specifically 5 to 10 mm. If the width of the chip is narrower than the above-mentioned level, it may become difficult to manufacture the chip itself. Conversely, if the width of the chip is wider than the above-mentioned level, the binding force of the carbon fiber in the stretching direction may decrease, which may cause a problem in which the physical properties of the composite material deteriorate. You can.

The thermoforming may be heat forming, or heat and pressure forming, and more specifically, may be heat press forming.

In one embodiment, the temperature condition during heating may be 240 to 320°C, more specifically 260 to 300°C, and even more specifically 260 to 280°C. If the heating temperature is excessively lower than the above level, the fluidity of the resin may decrease during molding, making molding difficult. Conversely, if the heating temperature is excessively higher than the above level, the resin may decompose during molding and physical properties may deteriorate.

In one embodiment, the pressure condition (eg, press pressure) during the pressurization may be 100 bar or less, and more specifically, 50 bar or less. If the applied pressure is excessively higher than the above level, the arrangement of the carbon fibers may be disturbed, resulting in a decrease in physical properties and surface appearance. There is no particular limit to the lower limit of the pressure condition during pressurization, and any pressure that allows the composite material to be formed from the chip without peeling is sufficient. For example, thermoforming may be performed under a pressure higher than atmospheric pressure.

In one embodiment, the thermoforming time may be 20 minutes or less, more specifically 10 minutes or less, and even more specifically 5 minutes or less. If the thermoforming time is longer than the above level, the alignment of the carbon fibers may be disturbed, or the physical properties of the composite may decrease due to excessive heat. There is no particular limitation on the lower limit of the thermoforming time, and any time that allows the composite material to be formed from the chip is sufficient. For example, it may be 0.5 minutes or more or 1 minute or more, but is not limited thereto.

Since the carbon fiber-reinforced composite material of the present invention is a lightweight material, it can be used as a replacement for aluminum. In one embodiment, the carbon fiber-reinforced composite of the present invention has a weight of less than 1.5 g/cm ³ , less than or equal to 1.49 g/cm ³ , less than or equal to 1.48 g/cm ³ , less than or equal to 1.47 g/cm ³ , less than or equal to 1.46 g/cm ³ , or It can indicate a specific gravity of 1.45 g/cm ³ or less. The specific gravity can be measured by the ASTM D792 method.

Additionally, the carbon fiber-reinforced composite material of the present invention can have superior tensile strength, flexural strength, superior shock absorption energy, and glossiness than aluminum. In one embodiment, the carbon fiber-reinforced composite of the present invention has a tensile strength of at least 265 MPa, at least 275 MPa, at least 285 MPa, at least 295 MPa, at least 300 MPa, at least 310 MPa, at least 320 MPa, at least 325 MPa, or at least 330 MPa. robbery; Flexural strength of at least 400 MPa, at least 410 MPa, at least 420 MPa, at least 430 MPa, at least 440 MPa, at least 450 MPa, at least 460 MPa, at least 470 MPa, at least 480 MPa, at least 490 MPa, at least 495 MPa, or at least 500 MPa; 23.0 J or higher, 23.2 J or higher, 23.4 J or higher, 23.6 J or higher, 24.0 J or higher, 24.5 J or higher, 25.0 J or higher, 25.5 J or higher, 26.0 J or higher, 26.3 J or higher, 26.5 J or higher, 27.0 J or higher, 27.5 J or more, 28.0 J or more or 28.2 J or more impact absorption energy; and a glossiness of 80 GU or more, 82 GU or more, 84 GU or more, or 84.5 GU or more. The tensile strength can be measured according to ASTM D3039, the flexural strength can be measured according to ASTM D790, the impact absorption energy can be measured according to ASTM D7136, and the glossiness can be measured according to ASTM D523. It can be measured based on

Typical prepreg (UD prepreg) containing carbon fibers aligned in one direction uses large equipment when manufacturing molded products, the lamination process is repeated, and the lamination process and press process are performed separately into different machine parts, which increases the manufacturing time. This takes a long time and is expensive. On the other hand, the discontinuous fiber-based carbon fiber-reinforced composite material of the present invention does not require a repetitive lamination process in the manufacturing process, so the process is simple, and the lamination process and press process are performed simultaneously, so the manufacturing time can be reduced to 1/10. there is. Additionally, when thermoplastic resin is applied, manufacturing time can be reduced by up to 1/6 in the mass production process. Therefore, it is more productive and economical than existing UD prepregs.

According to another aspect of the present invention, (1) impregnating carbon fibers aligned in one direction with a thermoplastic resin to prepare a thermoplastic resin composition having a carbon fiber content of 19 to 72% by volume; (2) cutting the thermoplastic resin composition to form a chip; and (3) thermoforming the manufactured chips. A method of manufacturing a carbon fiber-reinforced composite material is provided, including a step.

In one embodiment, step (3) includes randomly arranging the chips manufactured in step (2) on a mold and then heating them; Alternatively, it may be a step of thermoforming by applying heat and pressure.

In the method for manufacturing a carbon fiber-reinforced composite material of the present invention, the thermoplastic resin, carbon fiber, chip shape, and thermoforming are as described above.

Hereinafter, the present invention will be described in more detail through examples. However, the scope of the present invention is not limited thereto.

[Example]

Example 1: Manufacturing of carbon fiber-reinforced composite (prepreg) having a black marble pattern containing 50% by volume of carbon fiber

After spreading carbon fiber (3k~50k woven carbon fiber, weight per unit area: 50~600 gsm) in one direction, polycarbonate resin (TRIREX 3020, Samyang Corporation) was melt-impregnated into the carbon fiber spread in one direction. Thus, a carbon fiber-reinforced thermoplastic resin composition [UD (Unidirectional) Tape type composite material] was produced. At this time, the content of carbon fiber was maintained at 50% by volume (based on ASTM D3171), based on the total volume of the thermoplastic resin composition.

Next, the prepared carbon fiber-reinforced UD tape was cut into chips with a length of 5 to 10 mm and a width of 5 to 50 mm by slitting/chopping.

Next, the manufactured chips were randomly scattered and arranged on the mold, and then a pressure of 0 to 50 bar was applied for 1 to 5 minutes at a press temperature of 260 to 280 ° C to produce black marble. A patterned carbon fiber-reinforced composite (prepreg) was prepared.

A specimen for measuring mechanical properties was manufactured from the manufactured carbon fiber-reinforced composite in accordance with ASTM D3039, and the mechanical properties of the specimen were measured by the following method, and the results are shown in Table 1 below.

Example 2: Manufacturing of carbon fiber-reinforced composite (prepreg) with black marble pattern containing 40% by volume of carbon fiber

A carbon fiber-reinforced composite material was manufactured in the same manner as in Example 1, except that the carbon fiber content in the carbon fiber reinforced thermoplastic resin composition was changed from 50% by volume to 40% by volume, and after manufacturing a specimen using the same, the following The mechanical properties of the specimen were measured using the method and are shown in Table 1 below.

Example 3: Manufacturing of carbon fiber-reinforced composite (prepreg) with black marble pattern containing 65% by volume of carbon fiber

A carbon fiber-reinforced composite material was manufactured in the same manner as in Example 1, except that the carbon fiber content in the carbon fiber reinforced thermoplastic resin composition was changed from 50% by volume to 65% by volume, and after manufacturing a specimen using the same, the following The mechanical properties of the specimen were measured using the method and are shown in Table 1 below.

Comparative Example 1: Short carbon fiber-reinforced polycarbonate composite

Based on the total volume of the mixture, 15 vol% of carbon short fibers (average length: 0.2 mm) and 85 vol% of molten polycarbonate resin (TRIREX 3020, Samyang Corporation) were mixed to prepare a mixture, and then the mixture was extruded to prepare a specimen. did. The mechanical properties of the manufactured specimens were measured using the following method, and the results are shown in Table 1 below.

Comparative Example 2: Metal Aluminum Specimen

A specimen was manufactured from aluminum (6061-T6) and the mechanical properties of the specimen were measured using the method below, and the results are shown in Table 1 below.

Comparative Example 3: Manufacturing of carbon fiber-reinforced composite using thermosetting resin

A carbon fiber-reinforced thermosetting resin composition was prepared by melt-impregnating carbon fiber (3k~50k woven carbon fiber, weight per unit area: 50~600 gsm) into thermosetting epoxy resin (YD128). At this time, the content of carbon fiber was maintained at 50% by volume (based on ASTM D3171), based on the total volume of the thermosetting resin composition.

Next, the prepared thermosetting resin composition is cut into chips with a length of 5 to 10 mm and a width of 5 to 50 mm by slitting/chopping, and the manufactured chips are randomly scattered and arranged on the mold. Then, it was placed in an autoclave at a temperature of 80 to 120°C for 40 to 200 minutes to produce a carbon fiber-reinforced thermosetting resin composite (prepreg). A specimen was prepared from the carbon fiber-reinforced thermosetting resin composite prepared above, and the mechanical properties of the specimen were measured by the method below, and the results are shown in Table 1 below.

Comparative Example 4: Manufacturing of carbon fiber-reinforced composite (prepreg) with black marble pattern containing 18% by volume of carbon fiber

A carbon fiber-reinforced composite material was manufactured in the same manner as in Example 1, except that the carbon fiber content in the carbon fiber reinforced thermoplastic resin composition was changed from 50% by volume to 18% by volume, and after manufacturing a specimen using the same, the following The mechanical properties of the specimen were measured using the method and are shown in Table 1 below.

Comparative Example 5: Manufacturing of carbon fiber-reinforced composite (prepreg) with black marble pattern containing 73% by volume of carbon fiber

A carbon fiber-reinforced composite material was manufactured in the same manner as in Example 1, except that the carbon fiber content in the carbon fiber reinforced thermoplastic resin composition was changed from 50% by volume to 73% by volume, and after manufacturing a specimen using the same, the following The mechanical properties of the specimen were measured using the method and are shown in Table 1 below.

<Measurement of physical properties>

- Tensile strength: The tensile strength of the specimen was measured according to ASTM D3039.

- Flexural strength and flexural rigidity: The flexural strength and flexural rigidity of the specimen were measured according to ASTM D790.

- Impact absorption energy: The impact absorption energy of the specimen was measured according to ASTM D7136.

- Specific gravity: The specific gravity of the specimen was measured according to ASTM D792.

- Glossiness: Glossiness of the specimen was measured according to ASTM D523.

[Table 1]

As shown in Table 1, the carbon fiber-reinforced thermoplastic resin composites of Examples 1 to 3 according to the present invention had excellent mechanical strengths such as tensile strength, flexural strength, flexural rigidity, and shock absorption energy, and the specific gravity was It was suitable for use as a lightweight material as it had ^{a weight} of less than 1.5 g/cm3, and its glossiness was excellent at over 80 GU.

However, in the case of Comparative Example 1, which was a composite reinforced with conventional carbon short fibers, the overall mechanical strength such as tensile strength, flexural strength, bending rigidity, and shock absorption energy was very poor, and in the case of Comparative Example 2, which was a metallic aluminum specimen, Although the mechanical strengths such as tensile strength, flexural strength, flexural rigidity, and shock absorption energy were good, the specific gravity was more than 1.5 g/cm ³ and was not suitable as a lightweight material. In the case of Comparative Example 3, which is a carbon fiber-reinforced thermosetting resin composite, Although it had excellent mechanical strengths such as tensile strength, flexural strength, flexural rigidity, and shock absorption energy, its specific gravity was over 1.5 g/cm ³ and, in particular, its glossiness was 48.5 GU, showing very poor gloss.

In addition, in the case of the carbon fiber-reinforced thermoplastic resin composite of Comparative Example 4, which contained less carbon fiber than the content specified in the present invention, the mechanical strengths such as tensile strength, flexural strength, flexural rigidity, and shock absorption energy were very poor overall. In the case of the carbon fiber-reinforced thermoplastic resin composite of Comparative Example 5 in which carbon fiber was contained in an amount greater than the content specified in the present invention, the thermoplastic resin did not perform its role as a base material, resulting in tensile strength, flexural strength, flexural rigidity and shock absorption energy. The overall mechanical strength of the back was very poor, the specific gravity was also over 1.5 g/cm ³ , making it unsuitable as a lightweight material, and the glossiness was 38.4 GU, showing very poor gloss.

As described above, the carbon fiber-reinforced thermoplastic resin composite according to the present invention containing a specific content of carbon fiber exhibits superior mechanical properties and glossiness compared to existing composite materials, has a lower specific gravity, and also requires a lamination process compared to the existing manufacturing process. Since there is no material, productivity and economic efficiency can be improved, and in particular, as shown in Figure 1, a unique black marble surface appearance can be achieved, so it can be usefully used as interior and exterior materials for automobiles and home appliances.

Claims (9)

As a carbon fiber-reinforced composite,
It is obtained by thermoforming chips of a thermoplastic resin composition containing carbon fibers aligned in one direction (unidirection) and polycarbonate resin impregnated with the carbon fibers,
The carbon fiber content in the thermoplastic resin composition is 40 to 65% by volume based on the total volume of the thermoplastic resin composition,
The carbon fiber-reinforced composite exhibits a specific gravity of less than 1.5 g/cm ³ and a gloss of 80 GU or more as measured according to ASTM D523,
Carbon fiber-reinforced composite. The carbon fiber-reinforced composite according to claim 1, wherein the length of the chip of the thermoplastic resin composition is 1 to 80 mm. The carbon fiber-reinforced composite according to claim 1, wherein the width of the chips of the thermoplastic resin composition is 1.5 to 25 mm. The carbon fiber-reinforced composite of claim 1, wherein the thermoforming is heat forming, or heat and pressure forming. The carbon fiber-reinforced composite of claim 1, wherein the thermoforming is hot press forming. delete A method for producing a carbon fiber-reinforced composite, comprising:
(1) Preparing a thermoplastic resin composition with a carbon fiber content of 40 to 65% by volume by impregnating carbon fibers aligned in one direction with a polycarbonate resin;
(2) cutting the thermoplastic resin composition to form a chip; and
(3) thermoforming the manufactured chips;
The manufactured carbon fiber-reinforced composite exhibits a specific gravity of less than 1.5 g/cm ³ and a gloss of 80 GU or more as measured according to ASTM D523,
Method for manufacturing carbon fiber-reinforced composites. The method of claim 7, wherein in step (3), the chips produced in step (2) are randomly arranged on the mold and then heated; Or a method of manufacturing a carbon fiber-reinforced composite material, which involves thermoforming by applying heat and pressure. delete