KR20170143230A - Method of manufacturing composite molded product by using chopped strand prepreg - Google Patents

Method of manufacturing composite molded product by using chopped strand prepreg Download PDF

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Publication number
KR20170143230A
KR20170143230A KR1020160077160A KR20160077160A KR20170143230A KR 20170143230 A KR20170143230 A KR 20170143230A KR 1020160077160 A KR1020160077160 A KR 1020160077160A KR 20160077160 A KR20160077160 A KR 20160077160A KR 20170143230 A KR20170143230 A KR 20170143230A
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South Korea
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prepreg
fiber
chopped strand
produce
laminated
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KR1020160077160A
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Korean (ko)
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용다경
윤준영
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코오롱인더스트리 주식회사
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Priority to KR1020160077160A priority Critical patent/KR20170143230A/en
Publication of KR20170143230A publication Critical patent/KR20170143230A/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
    • B29C70/504—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC] using rollers or pressure bands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
    • B29C70/504—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC] using rollers or pressure bands
    • B29C70/506—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC] using rollers or pressure bands and impregnating by melting a solid material, e.g. sheet, powder, fibres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers

Abstract

The present invention is characterized by using a chopped strand prepreg that has a low resin impregnation amount of 30-45 wt%, and thus a relatively high content of reinforcing fibers in the production of composite molded products using a chopped strand prepreg. By using the chopped strand prepreg with a desirable strain to form composite molded products, the present invention can effectively prevent degradation of properties in curved portions or portions having holes for connection of the molded products, while shortening the molding time. Particularly, the chopped strand prepreg used in molding a composite material according to the present invention, due to a high content of reinforcing fibers of 55-70 wt%, can dramatically enhance properties and productivity of the composite molded products.

Description

절단된 섬유다발 프리프레그를 이용한 복합재료 성형물의 제조방법{Method of manufacturing composite molded product by using chopped strand prepreg}BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing a composite material molded article using a cut fiber bundle prepreg,

본 발명은 절단된 섬유다발 프리프레그(Chopped strand prepreg)를 이용한 복합재료 성형물의 제조방법에 관한 것으로서, 구체적으로는 성형시간이 단축되고, 복합재료 성형물의 굴곡부분이나 연결을 위한 홀 형성 부분 등에서 물성이 취약해지는 것을 효과적으로 방지할 수 있고, 복합재료 성형물의 성형 안정성 및 생산성을 향상시킬 수 있는 절단된 섬유다발 프리프레그를 이용한 복합재료 성형물의 제조방법에 관한 것이다.The present invention relates to a method of manufacturing a composite material using a chopped strand prepreg. More particularly, the present invention relates to a method of manufacturing a composite material using a chopped strand prepreg, The present invention relates to a method of producing a composite material molded article using a cut fiber bundle prepreg capable of effectively preventing the resin composition from being weakened and improving the molding stability and productivity of the composite material molding.

탄소섬유, 유리섬유, 아라미드 섬유 등과 같은 강화(보강) 섬유와 매트릭스 수지를 복합하여 얻어지는 복합재료(섬유강화플라스틱)는 기계적 특성이나 내열성 등이 요구되는 다양한 분야에 사용되고 있다.BACKGROUND ART Composite materials (fiber reinforced plastics) obtained by combining reinforcing (reinforcing) fibers such as carbon fiber, glass fiber, and aramid fiber with matrix resin are used in various fields requiring mechanical properties and heat resistance.

복합재료 성형물은 제조하는 방법으로는 필라멘트 와인딩(Filament winding) 방법 또는 수지 이송 몰딩(Resin Transfer Molding : RTM) 방법이 사용되고 있으나 이 경우 성형시간이 약 90분 정도로 길어지는 문제가 있었기 때문에 최근에는 성형시간이 약 10분 이내로 단축 가능한 프리프레그 압착 몰딩(Prepreg Compression Molding : PCM) 방법이 널리 사용되고 있다.Filament winding method or Resin Transfer Molding (RTM) method is used as a manufacturing method of a composite material molding. In this case, molding time is extended to about 90 minutes, Prepreg Compression Molding (PCM) method which can shorten within about 10 minutes is widely used.

상기 PCM 방법은 보강섬유와 매트릭스 수지가 미리 일정한 비율로 함침되어 미경화된 시트 상의 복합재료 중간재인 프리프레그(Prepreg)에 열과 압력만을 가하여 복합재료 성형물을 제조하기 때문에, 다시 말해 보강섬유에 매트릭스 수지를 함침시키는 공정(시간)이 생략되기 때문에, 성형시간을 10분 이내로 단축 가능하다.In the PCM method, since the reinforcing fiber and the matrix resin are impregnated at a predetermined ratio to form a composite material, only heat and pressure are applied to a prepreg which is a non-cured sheet-form composite intermediate material, that is, (Time) for impregnating the substrate is omitted, so that the molding time can be shortened to 10 minutes or less.

PCM 방법으로 복합재료 성형물을 제조할 때 일방향성(Uni-directional : UD) 프리프레그로 제조하는 경우, 보강섬유들이 일방향으로 배열되어 복합재료 성형물의 물성이 가장 우수하나, 상기 일방향성(UD) 프리프레그는 섬유배열방향과 수직방향으로는 물성이 취약한 단점이 있고 변형율이 낮아 복잡한 성형물 제조 시 연결을 위한 홀 형성 부분, 가장자리 부분 등과 같이 형태변형이 큰 구간에서는 물성이 취약해지는 문제가 있었다.When the composite material is manufactured by the PCM method, the reinforcing fibers are arranged in one direction to provide the most excellent physical properties of the composite material when the UD prepreg is manufactured as a uni-directional (UD) prepreg. However, There is a disadvantage that physical properties are weak in the fiber array direction and perpendicular direction, and the strain is low. Thus, there is a problem that physical properties are weakened in a section where the shape is deformed such as a hole forming portion and an edge portion for connection in the production of a complicated molded article.

상기와 같이 성형물 중 물성이 취약한 부분을 프리프레그나 테이프(Tape)로 보강할 수는 있지만, 공정이 번거로워지고 또 다른 문제가 발생할 수도 있다.As described above, a portion of the molded product having poor physical properties can be reinforced with a prepreg or a tape, but the process becomes troublesome and another problem may arise.

상기 문제점을 해결하기 위한 또 다른 종래기술로는 일방향성(UD) 프리프레그 여러매를 섬유배열 방향이 경사지게 교호로 다층 적층하여 복합재료 성형물을 제조하는 방법도 실시되어 왔으나, 상기 일방향성(UD) 프리프레그는 시트(Sheet) 형태이기 때문에 성형공정 중 변형율이 떨어지고 그로 인해 성형물 중 굴곡부분, 가장자리 부분 또는 연결을 위한 홀 형성 부분의 물성이 취약해 지거나 가공이 되지 않는 문제가 있었다.As another conventional technique for solving the above problems, there has been practiced a method of producing a composite material molding by laminating a plurality of unidirectional (UD) prepregs in an alternating fashion in a direction of fiber arrangement. However, Since the prepreg is in the form of a sheet, there is a problem that the deformation rate during the molding process is lowered, and the properties of the bent portion, the edge portion, or the hole forming portion of the formed article are weakened or not processed.

열가소성 장섬유 강화 복합재료(Long Fiber reinforced Thermoplastic : LFT)를 이용하여 복합재료 성형물을 제조하는 경우에는 상기 복합재료내 수지함량이 50~70중량%로 높게 한정되기 때문에 보강섬유 함량 부족으로 물성 및 생산성이 저하되는 문제가 있었다.In the case of producing a composite material using a thermoplastic long fiber reinforced thermoplastic (LFT), the resin content in the composite material is as high as 50 to 70% by weight, There is a problem in that it is lowered.

대한민국 공개특허 제10-2008-0033315호에서는 일방향성(UD) 프리프레그를 폭 및 길이방향으로 잘게 절단시켜 제조한 절단된 섬유다발 프리프레그(Chopped strand prepreg)를 섬유방향이 무작위가 되도록 적층한 후 가열 및 가압하여 제조된 시트형태의 등방향성 프리프레그를 이용하여 복합재료 성형물을 제조하는 방법을 게재하고 있으나, 상기 등방향성 프리프레그는 시트형태이기 때문에 성형공정 중 변형율이 떨어지고 그로 인해 성형물 중 굴곡부분, 가장자리 부분 또는 연결을 위한 홀 형성 부분의 물성이 취약해 지는 문제가 있었다.Korean Patent Laid-Open No. 10-2008-0033315 discloses a method of laminating a chopped strand prepreg prepared by cutting a unidirectional (UD) prepreg in a width and lengthwise direction so that the fiber direction is random A method of manufacturing a composite molded article using a sheet-like isotropic prepreg produced by heating and pressing is disclosed. However, since the isotropic prepreg is in the form of a sheet, the strain rate during the molding process is lowered, , There is a problem that the physical properties of the edge portion or the hole forming portion for connection become weak.

미국등록특허 제8,366,046호 및 일본 공개특허 소58-211416호에서는 상기 절단된 섬유다발 프리프레그(Chopped strand prepreg)를 제조하는 방법 및 이를 이용하여 복합재료 성형물을 제조하는 방법이 게재되어 있으나, 이때 사용되는 상기 절단된 섬유다발 프리프레그(Chopped strand prepreg)는 보강섬유 함량이 50중량% 이하로 낮아서 제조되는 복합재료 성형물의 물성이 크게 저하되는 문제가 있었다.U.S. Patent No. 8,366,046 and Japanese Patent Laid-Open No. 58-211416 disclose a method of producing the chopped strand prepreg and a method of manufacturing a composite material using the same. The chopped strand prepreg has a low reinforcing fiber content of 50% by weight or less and thus has a problem in that the physical properties of a molded article of a composite material produced are greatly reduced.

본 발명의 과제는 성형시간이 단축되고, 복합재료 성형물의 굴곡부분이나 홀 형성 부분, 연결을 위한 홀 형성 부분 등에서 물성이 취약해 지는 것을 효과적으로 방지할 수 있고, 제조되는 복합재료 성형물의 물성 및 성형 안정성을 크게 향상시킬 수 있는 절단된 섬유다발 프리프레그(Chopped strand prepreg)를 제조하는 방법을 제공하는 것이다.It is an object of the present invention to shorten the molding time and effectively prevent the physical properties from being weakened in the bending portion, the hole forming portion, the hole forming portion for connection, etc. of the molded composite article, And to provide a method for producing a chopped strand prepreg that can greatly improve stability.

이를 위해하여 본 발명에서는 프리프레그 내에 함침된 수지 함량이 30~45중량%이고 프리프레그를 구성하는 섬유 함량이 55~70중량%인 절단된 섬유다발 프리프레그(Chopped strand prepreg)를 사용하여 복합재료 성형물을 제조한다.For this purpose, in the present invention, a chopped strand prepreg having a resin content of 30 to 45% by weight in the prepreg and a fiber content of 55 to 70% by weight constituting the prepreg, A molded product is produced.

본 발명은 성형공정 중 변형율이 뛰어난 절단된 섬유다발 프리프레그(Chopped strand prepreg)를 사용하여 복합재료 성형물을 제조하기 때문에 상기 성형물 중 굴곡부분이나 연결을 위한 홀 형성 부분의 물성이 취약해 지는 것을 효과적으로 방지할 수 있고, 성형시간도 단축시킬 수 있다.Since the present invention uses a chopped strand prepreg having a high strain rate during the molding process to produce a composite molded article, it is effective to effectively reduce the physical properties of the bending portion and the hole forming portion for connection of the molded article And the molding time can be shortened.

특히, 본 발명에서 복합재료 성형시 사용되는 상기의 절단된 섬유다발 프리프레그는 보강섬유의 함량이 55~70중량%로 높기 때문에 열가소성 장섬유 강화 복합재료(LFT)를 적용하는 경우보다 복합재료 성형물의 물성과 생산성을 크게 향상시킬 수 있으며 직물(Fabric)이나 일방향성 (UD) 프리프레그를 적용하는 경우보다 형태적 안정성이 우수하다는 장점이 있다.Particularly, in the present invention, since the content of the reinforced fiber is as high as 55 to 70% by weight, the cut fiber bundle prepreg used in the composite material molding is more preferable than the case of applying the thermoplastic long fiber reinforced composite material (LFT) And it has an advantage that it is superior in morphological stability than the case of applying a fabric (Fabric) or a unidirectional (UD) prepreg.

이하, 본 발명을 상세하게 설명한다.Hereinafter, the present invention will be described in detail.

본 발명은 프리프레그 내에 함침된 수지 함량이 30~45중량%이고 프리프레그를 구성하는 섬유 함량이 55~70중량%인 절단된 섬유다발 프리프레그(Chopped strand prepreg)를 사용하여 복합재료 성형물을 제조하는 것을 특징으로 한다.The present invention relates to a method for producing a composite molded article using a chopped strand prepreg having a resin content of 30 to 45% by weight in a prepreg and a fiber content of 55 to 70% by weight constituting a prepreg .

절단된 섬유다발 프리프레그(Chopped strand prepreg)내 섬유함량이 55중량% 미만인 경우에는 복합재료 성형물의 기계적 물성 및 생산성이 저하되고, 70중량%를 초과하는 경우에는 상대적으로 수지 함침량이 30중량% 미만으로 낮아져 접착성 및 성형성이 저하된다.When the fiber content in the chopped strand prepreg is less than 55% by weight, the mechanical properties and productivity of the molded composite article are deteriorated. When the fiber content exceeds 70% by weight, the amount of resin impregnated is less than 30% And the adhesiveness and moldability are lowered.

본 발명의 구현일례로는 상기 절단된 섬유다발 프리프레그를 섬유 배향이 무작위가 되도록 적층시켜 적층물을 제조한 다음, 상기 적층물을 가열 및 가압하여 등방성 프리프레그 시트를 제조한 다음, 상기 등방성 프리프레그 시트를 몰드에 적층한 후 가열 및 가압하여 복합재료 성형물을 제조한다.In an embodiment of the present invention, the cut fiber bundle prepreg is laminated so that the fiber orientations are random, and then the laminate is heated and pressed to produce an isotropic prepreg sheet, The leg sheet is laminated on a mold, and then heated and pressed to produce a molded composite article.

본 발명의 또 다른 구현일례로는 상기 절단된 섬유다발 프리프레그를 몰드에 무작위가 되도록 적층한 후 가열 및 가압하여 복합재료 성형물을 제조한다.In another embodiment of the present invention, the cut fiber bundle prepreg is laminated on a mold at random, and then heated and pressurized to produce a molded composite article.

상기 절단된 섬유다발 프리프레그(Chopped strand prepreg) 내에 함침된 상기 수지는 폴리프로필렌, 폴리술폰, 폴리에텔술폰, 폴리 에테르케톤, 폴리 에테르 에테르 케톤, 방향족 폴리아미드, 지방족 폴리아미드, 방향족 폴리에스테르, 방향족 폴리카보네이트, 폴리 에테르 이미드, 폴리 알릴렌 옥시드, 열가소성 폴리이미드, 폴리 아미드이미드, 폴리부틸렌 테레프탈레이트, 폴리에틸렌 테레프탈레이트, 폴리에틸렌, 아크릴로니트릴 부타디엔 스티렌으로 구성되는 군으로부터 선택된 1종 또는 2종 이상의 혼합물 등인 것이 바람직하다.The resin impregnated into the cut chopped strand prepreg may be selected from the group consisting of polypropylene, polysulfone, polyether sulfone, polyether ketone, polyetheretherketone, aromatic polyamide, aliphatic polyamide, aromatic polyester, aromatic One or two kinds selected from the group consisting of polyolefin, polycarbonate, polyether imide, polyallylene oxide, thermoplastic polyimide, polyamideimide, polybutylene terephthalate, polyethylene terephthalate, polyethylene, acrylonitrile butadiene styrene Or a mixture thereof.

상기 절단된 섬유다발 프리프레그(Chopped strand prepreg)를 구성하는 상기 섬유(보강섬유)는 탄소섬유, 유리섬유, 아라미드 섬유 또는 고강력 폴리에스테르 섬유 등인 것이 바람직하다.The fiber (reinforcing fiber) constituting the cut chopped strand prepreg is preferably carbon fiber, glass fiber, aramid fiber or high-strength polyester fiber.

본 발명에서는 상기 수지 및 섬유의 종류를 특별하게 한정하는 것은 아니다.In the present invention, the kinds of the resins and fibers are not particularly limited.

이하, 실시예 및 비교실시예를 통하여 본 발명을 상세하게 설명한다. 그러나 본 발명의 보호범위는 하기 실시예만으로 한정되게 해석되어서는 안된다.Hereinafter, the present invention will be described in detail with reference to examples and comparative examples. However, the scope of protection of the present invention should not be construed as being limited only to the following examples.

실시예Example 1 One

길이가 30㎜이고, 두께(폭)가 10㎜이고 수지함량이 35중량%이고, 보강섬유인 탄소섬유의 함량이 65중량%인 절단된 섬유다발 프리프레그를 섬유배향이 무작위가 되도록 적층시켜 적층물을 제조한 다음, 상기 적층물을 가열 및 가압하여 등방성 프리프레그 시트를 제조한 다음, 상기 등방성 프리프레그 시트를 몰드에 적층한 후 가열 및 가압하여 복합재료 성형물을 제조하였다.A cut fiber bundle prepreg having a length of 30 mm, a thickness (width) of 10 mm, a resin content of 35% by weight and a carbon fiber content of 65% by weight as a reinforcing fiber was laminated so that the fiber orientation was random, After water was prepared, the laminate was heated and pressed to produce an isotropic prepreg sheet, and then the isotropic prepreg sheet was laminated on a mold, followed by heating and pressing to produce a composite molding.

몰드에 무작위가 되도록 적층한 후 가열 및 가압하여 복합재료 성형물을 제조하였다.Laminated so as to be random in the mold, and then heated and pressed to produce a molded composite article.

실시예Example 2 2

길이가 30㎜이고, 두께(폭)가 10㎜이고 수지함량이 40중량%이고, 보강섬유인 아라미드 섬유의 함량이 60중량%인 절단된 섬유다발 프리프레그를 몰드에 무작위가 되도록 적층한 후 가열 및 가압하여 복합재료 성형물을 제조하였다.A cut fiber bundle prepreg having a length of 30 mm, a thickness (width) of 10 mm, a resin content of 40% by weight and an aramid fiber content of 60% by weight as a reinforcing fiber was laminated in a mold at random, And pressurized to produce a molded composite article.

비교실시예Comparative Example 1 One

길이가 30㎜이고, 두께(폭)가 10㎜이고 수지함량이 60중량%이고, 보강섬유인 탄소섬유의 함량이 40중량%인 절단된 섬유다발 프리프레그를 섬유배향이 무작위가 되도록 적층시켜 적층물을 제조한 다음, 상기 적층물을 가열 및 가압하여 등방성 프리프레그 시트를 제조한 다음, 상기 등방성 프리프레그 시트를 몰드에 적층한 후 가열 및 가압하여 복합재료 성형물을 제조하였다.A cut fiber bundle prepreg having a length of 30 mm, a thickness (width) of 10 mm, a resin content of 60% by weight and a carbon fiber content of 40% by weight as a reinforcing fiber was laminated so that the fiber orientation was random, After water was prepared, the laminate was heated and pressed to produce an isotropic prepreg sheet, and then the isotropic prepreg sheet was laminated on a mold, followed by heating and pressing to produce a composite molding.

몰드에 무작위가 되도록 적층한 후 가열 및 가압하여 복합재료 성형물을 제조하였다.Laminated so as to be random in the mold, and then heated and pressed to produce a molded composite article.

비교실시예Comparative Example 2 2

탄소섬유 일방향성(UD) 프리프레그 5매를 몰드에 적층한 후 가열 및 가압하여 복합재료 성형물을 제조하였다.Five carbon fiber unidirectional (UD) prepregs were laminated on a mold, followed by heating and pressing to produce a molded composite article.

실시예 1 및 실시예 2의 경우에는 성형공정 중 상기 절단된 섬유다발 프리프레그들의 변형율이 높아서 제조된 복합재료 성형물 중 가장자리 부분, 굴곡부분 또는 연결을 위한 홀 형성부분의 물성이 취약하게 되는 현상이 발생되지 않았으나, 비교실시예 2의 경우에는 성형공정 중 상기 탄소섬유 일방향성(UD) 프리프레그들의 변형율이 낮아서 제조된 복합재료 성형물 중 가장자리 부분, 굴곡부분 또는 연결을 위한 홀 형성부분을 가공하는데 있어 형태적 안정성이 나오지 않아 실시예 1 및 실시예 2와 동일한 형태의 성형물 제조에 실패하였다.In the case of Examples 1 and 2, the deformation rate of the cut fiber bundle prepregs during the forming process is high, and thus the physical properties of the edge portions, bending portions, or hole forming portions for connection are weakened However, in the case of Comparative Example 2, the deformation rate of the carbon fiber unidirectional (UD) prepregs during the molding process is low, so that the edge portion, the bending portion, The molded articles of the same type as those of Examples 1 and 2 failed to be produced.

또한, 실시예 1 및 실시예 2의 경우에는 절단된 섬유다발 프리프레그내 섬유함량이 65중량% 또는 60중량% 수준으로 높기 때문에 제조된 복합재료 성형물의 기계적 물성과 생산성이 크게 향상되었으나, 비교실시예 1의 경우에는 절단된 섬유다발 프리프레그내 섬유함량이 40중량% 수준으로 낮기 때문에 제조된 복합재료 성형물의 기계적 물성과 생산성이 실시예 1 및 실시예 2와 비교시 저하되었다.In addition, in the case of Examples 1 and 2, since the fiber content in the cut fiber bundle prepreg was as high as 65% by weight or 60% by weight, mechanical properties and productivity of the produced composite material were greatly improved. In the case of Example 1, since the fiber content in the cut fiber bundle prepreg was as low as 40% by weight, the mechanical properties and the productivity of the produced composite material molding were lowered as compared with Examples 1 and 2.

Claims (5)

프리프레그 내에 함침된 수지 함량이 30~45중량%이고 프리프레그를 구성하는 섬유 함량이 55~70중량%인 절단된 섬유다발 프리프레그(Chopped strand prepreg)를 사용하여 복합재료 성형물을 제조하는 것을 특징으로 하는 절단된 섬유다발 프리프레그를 이용한 복합재료 성형물의 제조방법.Characterized in that a composite material molding is produced by using a chopped strand prepreg having a resin content of 30 to 45% by weight impregnated in the prepreg and a fiber content of 55 to 70% by weight constituting the prepreg Wherein the fiber bundle prepreg is cut to a predetermined length. 제1항에 있어서, 상기 절단된 섬유다발 프리프레그를 섬유 배향이 무작위가 되도록 적층시켜 적층물을 제조한 다음, 상기 적층물을 가열 및 가압하여 등방성 프리프레그 시트를 제조한 다음, 상기 등방성 프리프레그 시트를 몰드에 적층한 후 가열 및 가압하여 복합재료 성형물을 제조하는 것을 특징으로 하는 절단된 섬유다발 프리프레그를 이용한 복합재료 성형물의 제조방법.The method according to claim 1, wherein the cut fiber bundle prepreg is laminated so that fiber orientations are randomized to produce a laminate, and then the laminate is heated and pressed to produce an isotropic prepreg sheet, Wherein the sheet is laminated on a mold and then heated and pressurized to produce a molded composite article. 제1항에 있어서, 상기 절단된 섬유다발 프리프레그를 몰드에 무작위가 되도록 적층한 후 가열 및 가압하여 복합재료 성형물을 제조하는 것을 특징으로 하는 절단된 섬유다발 프리프레그를 이용한 복합재료 성형물의 제조방법.The method according to claim 1, wherein the cut fiber bundle prepreg is laminated so as to be random in a mold, followed by heating and pressing to produce a composite material molding. . 제1항에 있어서, 폴리프로필렌, 폴리술폰, 폴리에텔술폰, 폴리 에테르케톤, 폴리 에테르 에테르 케톤, 방향족 폴리아미드, 지방족 폴리아미드, 방향족 폴리에스테르, 방향족 폴리카보네이트, 폴리 에테르 이미드, 폴리 알릴렌 옥시드, 열가소성 폴리이미드, 폴리 아미드이미드, 폴리부틸렌 테레프탈레이트, 폴리에틸렌 테레프탈레이트, 폴리에틸렌, 아크릴로니트릴 부타디엔 스티렌으로 구성되는 군으로부터 선택된 1종 또는 2종 이상의 혼합물인 것을 특징으로 하는 절단된 섬유다발 프리프레그를 이용한 복합재료 성형물의 제조방법.The method according to claim 1, further comprising the step of mixing a mixture of at least one of polypropylene, polysulfone, polyethersulfone, polyether ketone, polyetheretherketone, aromatic polyamide, aliphatic polyamide, aromatic polyester, aromatic polycarbonate, polyether imide, Characterized in that it is a mixture of at least one material selected from the group consisting of a thermoplastic polyimide, a thermoplastic polyimide, a polyamideimide, a polybutylene terephthalate, a polyethylene terephthalate, a polyethylene, and an acrylonitrile butadiene styrene. A method of manufacturing a molded composite article using a leg. 제1항에 있어서, 상기 섬유는 탄소섬유, 유리섬유, 아라미드 섬유 및 고강력 폴리에스테르 섬유 중에서 선택된 1종 또는 2종 이상인 것을 특징으로 하는 절단된 섬유다발 프리프레그를 이용한 복합재료 성형물의 제조방법.

The method according to claim 1, wherein the fibers are one or more selected from carbon fiber, glass fiber, aramid fiber and high-strength polyester fiber.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220085889A (en) * 2020-12-15 2022-06-23 주식회사 이지컴퍼지트 Tow prepreg having high impact strength for the filament winding

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220085889A (en) * 2020-12-15 2022-06-23 주식회사 이지컴퍼지트 Tow prepreg having high impact strength for the filament winding

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