JPH01163219A - Production of fiber-reinforced resin composition - Google Patents
Production of fiber-reinforced resin compositionInfo
- Publication number
- JPH01163219A JPH01163219A JP62322373A JP32237387A JPH01163219A JP H01163219 A JPH01163219 A JP H01163219A JP 62322373 A JP62322373 A JP 62322373A JP 32237387 A JP32237387 A JP 32237387A JP H01163219 A JPH01163219 A JP H01163219A
- Authority
- JP
- Japan
- Prior art keywords
- strand
- divided
- chopped strands
- fiber
- strands
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011342 resin composition Substances 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims description 28
- 239000000835 fiber Substances 0.000 claims abstract description 28
- 229920005989 resin Polymers 0.000 claims abstract description 22
- 239000011347 resin Substances 0.000 claims abstract description 22
- 238000005520 cutting process Methods 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 239000002131 composite material Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 abstract description 8
- 229920006305 unsaturated polyester Polymers 0.000 abstract description 2
- 239000003677 Sheet moulding compound Substances 0.000 description 29
- 238000000034 method Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 12
- 238000005096 rolling process Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 229920000049 Carbon (fiber) Polymers 0.000 description 7
- 239000004917 carbon fiber Substances 0.000 description 7
- 239000004412 Bulk moulding compound Substances 0.000 description 6
- 238000005452 bending Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 5
- 230000006378 damage Effects 0.000 description 4
- 239000003733 fiber-reinforced composite Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 238000004513 sizing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000002990 reinforced plastic Substances 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B15/00—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
- B29B15/08—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
- B29B15/10—Coating or impregnating independently of the moulding or shaping step
- B29B15/12—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length
- B29B15/122—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length with a matrix in liquid form, e.g. as melt, solution or latex
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、繊維強化樹脂組成物の製造方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing a fiber-reinforced resin composition.
［従来の技術］
従来、炭素繊維、ガラス繊Ｍ笠を集束させ、所定の長さ
に切断し、樹脂成分中に分散させたシート・モールディ
ング・コンパウンド（以下ＳＭＣという）やバルク・モ
ールディング・コンパウンド（以下ＢＭＣという）等の
４ＪｉＩｌｔ強化樹脂組成物を得るために以下のような
方法が行われている。[Prior Art] Conventionally, sheet molding compounds (hereinafter referred to as SMC) and bulk molding compounds (hereinafter referred to as SMC) are made by bundling carbon fibers and glass fibers, cutting them into predetermined lengths, and dispersing them in a resin component. In order to obtain 4Jilt reinforced resin compositions such as BMC (hereinafter referred to as BMC), the following method has been carried out.
その１つには第４図に示すような製造装置を用いる方法
がある。One of them is a method using a manufacturing apparatus as shown in FIG.
この製造装置は多数の短繊維を集束させて一本の束にし
たストランド１００を巻き付けたロービング１０１と、
ストランド１００を案内するガイドローラ１０２．１０
３と、ストランド１００を所定長に切断するチョッパー
１０４と、切断され、落下するチョツプドストランド１
１１を受は堆積させるシートロール１０５．１０６と、
これらシートロール１０５．１０６から引き出されるシ
ート１０５ａ、１０６ａ上に熱硬化性樹脂を供給する樹
脂留め１０７．１０８と、チョツプドストランド１１１
をシート１０５ａ、１０６ａと一緒に巻取る巻取りリー
ル１０９とから構成される装置かかる製造装置を用いて
ロービング１０１から引き出されたストランド１００を
チョッパー１０４で所定長に切断し、チョツプドストラ
ンド１１１とする（第５図参照）。このチョツプドスト
ランド１１１をシート１０５ａ上に落下、分散させ、も
う１つのシート１０６ａを繰り出して、前述のように分
散したチョツプドストランド１１１とシーｔ−１０５ａ
、１０６ａに塗布された樹脂成分とを一体化させて巻取
りロール１０９によって巻取ってｔ＆ｌ雑強化樹脂組成
物を製造している。This manufacturing device includes a roving 101 around which a strand 100 made of a large number of staple fibers is wrapped.
Guide roller 102.10 guiding the strand 100
3, a chopper 104 that cuts the strand 100 into a predetermined length, and a chopped strand 1 that is cut and falls.
sheet rolls 105 and 106 for depositing 11;
Resin clamps 107 and 108 supply thermosetting resin onto the sheets 105a and 106a pulled out from these sheet rolls 105 and 106, and chopped strands 111
The strand 100 pulled out from the roving 101 is cut into a predetermined length by the chopper 104 using this manufacturing device, and the chopped strand 111 is cut into a predetermined length by the chopper 104. (See Figure 5). The chopped strands 111 are dropped and dispersed onto the sheet 105a, and another sheet 106a is fed out, and the chopped strands 111 and the sheet t-105a are separated as described above.
, 106a are integrated and wound up by a winding roll 109 to produce a t&l miscellaneous reinforced resin composition.
［発明が解決しようとする問題点］
上記した従来の製造方法により製造された従来のＳＭＣ
，ＢＭＣと、炭素繊維等を一方向に引き揃え、エポキシ
樹脂等で硬化させたいわゆる一方向繊維強化複合材料と
の力学特性は弾性率、曲げ強度等のいずれにおいても、
一方向繊維強化複合材料の方が優れていることが一般に
認識されている。[Problems to be solved by the invention] Conventional SMC manufactured by the above-mentioned conventional manufacturing method
, BMC and a so-called unidirectional fiber-reinforced composite material made of carbon fibers aligned in one direction and cured with epoxy resin etc. The mechanical properties are as follows, in terms of elastic modulus, bending strength, etc.
It is generally recognized that unidirectional fiber reinforced composite materials are superior.
しかしながらＳＭＣ，ＢＭＣ等のもつ経済性、成形性へ
の評価は高く、前記一方向繊維強化複合材料と遜色のな
いすぐれた特性を有するＳＭＣ。However, SMC, BMC, etc. are highly evaluated for their economic efficiency and moldability, and SMC has excellent properties comparable to those of the unidirectional fiber reinforced composite materials.
ＢＭＣ等を製造しうる製造方法の開発が強く望まれてい
た。、（「カーボンファイバ・（オーム社）」Ｐ１３〜
Ｐ１５（昭和５９年２月２０日発行）、「強化プラスチ
ックハンドブック（日刊工業新聞社）ＪＰ９０〜Ｐ９２
、Ｐｉ０５〜Ｐ１１７（昭和５０年５月１５日発行））
本発明は炭素繊維チョツプドストランド等を樹脂成分に
充填して強化した高弾性、高強度であり、かつ疲労耐久
性に優れた繊維強化樹脂組成物を製造するための製造方
法を提供することを目的とする。There has been a strong desire to develop a manufacturing method that can manufacture BMC and the like. , ("Carbon Fiber (Ohmsha)" P13~
P15 (published February 20, 1980), "Reinforced Plastics Handbook (Nikkan Kogyo Shimbun) JP90-P92
, Pi05-P117 (published on May 15, 1975)) The present invention is a fiber reinforced by filling a resin component with chopped carbon fiber strands, etc., which has high elasticity, high strength, and excellent fatigue durability. It is an object of the present invention to provide a manufacturing method for manufacturing a reinforced resin composition.
［問題点を解決するための手段］
本発明の繊維強化樹脂組成物の製造方法は、多数の単繊
維を集束して得られたストランドを所定長さに切断する
とともに軸方向に分割し、分割チョツプドストランドと
する分割切断工程と、得られた分割チョツプドストラン
ドを少なくとも二次元的に分散させるとともに樹脂成分
と一体化させる複合工程と、からなることを特徴とする
ものである。[Means for Solving the Problems] The method for producing a fiber-reinforced resin composition of the present invention involves cutting a strand obtained by bundling a large number of single fibers into a predetermined length and dividing it in the axial direction. This method is characterized by comprising a step of dividing and cutting into chopped strands, and a composite step of dispersing the obtained chopped strands at least two-dimensionally and integrating them with a resin component.
［実施例コ
以下、本発明の繊維強化樹脂組成物の製造方法の一実施
例を図面に基づいて説明する。なお、実施例においては
繊維強化樹脂組成物をＳＭＣの形で製造する場合を示す
。[Example 1] Hereinafter, an example of the method for producing a fiber-reinforced resin composition of the present invention will be described based on the drawings. In addition, in Examples, the case where the fiber reinforced resin composition is manufactured in the form of SMC is shown.
本実施例のｍ帷強化樹脂組成物の製造方法は分割切断工
程と複合工程よりなる。この分割切断工程部分の概略構
成図を第１図に、複合工程の概略構成図を第２図に示す
。The method for manufacturing the m-thread reinforced resin composition of this example consists of a dividing and cutting process and a composite process. A schematic diagram of the divisional cutting process is shown in FIG. 1, and a diagram of the combined process is shown in FIG. 2.
分割切断工程では、第１図に示す装置を使用する。即ち
、ロービングから引き出されるストランド１の移動方向
に、順に圧延ロール２（上ロール２ａ、下ロール２ｂ）
、カッタ部３、搬送ローラ４（」：ロール４ａ１下ロー
ル４ｂ）およびチョッパー５が配置されている。上記圧
延ロール２の上ロール２ａは軸受２ｄにより支持され、
一方この軸受２ｄは取付基部１つに一端が固定されてバ
ネ２Ｃにより下方へ圧せられている。こうして上ロール
２ａと下ロール２ｂを圧接させている。なお、この圧延
ロール２は図示しない制御手段によりその回転に抗して
制動が加えられる。ストランド１を軸方向に分割するカ
ッタ部３は当て板３ｄに当接し、当て板３ｄとの間を通
るストランド１をその軸方向に裂き、複数の繊維束に細
分割する刃３ａを有する。刃３ａは所定枚数（望ましく
は繊維束の分割数と同数）ストランド１の搬送方向に沿
って等間隔で、かつ平行に配置されている。この刃３ａ
は共通の保持部３Ｃに取付けられ、一方この保持部３Ｃ
は一端が取付部２１に固定されたバネ３ｂにより下方へ
押圧されている。搬送ロール４は前記カッタ部３の下流
側に所定間隔を置いて設けられている。その上ロール４
ａは軸受４ｄにより支持され、一方、この軸受４ｄは取
付基部２２に一端が固定されたバネ４Ｃを介して下方へ
圧せられ下ロール４ｂと圧接している。搬送ロール４の
下流には一対のロール５ａ、５ｂからなり、ストランド
１を所定長に切断するためチョッパ５が配置されている
。なお前記制動手段により圧延ロール２と搬送ロール４
との間のストランド１には一定の張力が与えられている
。In the division cutting process, an apparatus shown in FIG. 1 is used. That is, in the moving direction of the strand 1 pulled out from the roving, the rolling rolls 2 (upper roll 2a, lower roll 2b)
, a cutter section 3, a conveyance roller 4 (": roll 4a1 lower roll 4b), and a chopper 5 are arranged. The upper roll 2a of the rolling roll 2 is supported by a bearing 2d,
On the other hand, this bearing 2d has one end fixed to one mounting base and is pressed downward by a spring 2C. In this way, the upper roll 2a and the lower roll 2b are brought into pressure contact. Note that this rolling roll 2 is braked against its rotation by a control means (not shown). The cutter part 3 that divides the strand 1 in the axial direction has a blade 3a that comes into contact with the backing plate 3d, cuts the strand 1 passing between the backing plate 3d in the axial direction, and finely divides it into a plurality of fiber bundles. A predetermined number of blades 3a (preferably the same number as the number of divisions of the fiber bundle) are arranged parallel to each other at regular intervals along the conveying direction of the strand 1. This blade 3a
is attached to a common holding part 3C, while this holding part 3C
One end is pressed downward by a spring 3b fixed to the mounting portion 21. The conveyance roll 4 is provided downstream of the cutter section 3 at a predetermined interval. Moreover roll 4
a is supported by a bearing 4d, and this bearing 4d is pressed downward via a spring 4C whose one end is fixed to the mounting base 22 and is in pressure contact with the lower roll 4b. A chopper 5 is disposed downstream of the transport roll 4, which consists of a pair of rolls 5a and 5b, and cuts the strand 1 into a predetermined length. Note that the braking means causes the rolling roll 2 and the conveying roll 4 to
A constant tension is applied to the strand 1 between the two.
次に上記した装置を使用する分割切断工程のプロセスを
説明する。Next, a divisional cutting process using the above-mentioned apparatus will be explained.
多数の単繊維をサイジング剤等の集束剤で集束したスト
ランド１はロービングより供給され、第１図に示すよう
に、まず圧延ロール２を通過する。A strand 1 in which a large number of single fibers are bundled with a binding agent such as a sizing agent is supplied from a roving, and first passes through a rolling roll 2, as shown in FIG.
ここで圧延により、ストランド１を太さ方向に押しつぶ
して断面をより藁平にして、ストランド１を繊維に平行
に裂き易くする。この分割は、ストランド１をピンチロ
ーラなどで押圧し、押圧しつつ横方向へずらすくもむ）
ようにしてもよい。Here, by rolling, the strand 1 is crushed in the thickness direction to make the cross section more flat, making it easier to tear the strand 1 parallel to the fibers. This division is done by pressing strand 1 with a pinch roller, etc., and shifting it laterally while pressing it.)
You can do it like this.
圧延ローラ２を通って、偏平となったストランド１は、
次いでカッタ部３へ搬送される。ここでカッタ部３の複
数枚等間隔に配置された刃３ａによりｌｌｌ輪軸方向平
行方向にストランド１を裂き、−本のストランドを数本
から、数十本の繊維束群に分割する。なお、−本のスト
ランド１を複数の繊維束群に分割する際、その分割数に
制限を与えるものではない。分割数が多く、ストランド
１が細かく分散するようにすればする程、後述のクラッ
クの進展を阻止する効果が高いため、出来るだけ多数に
分割することが望ましい。The strand 1 that has passed through the rolling roller 2 and has become flat is
Then, it is transported to the cutter section 3. Here, the strand 1 is torn in a direction parallel to the wheel axis direction using a plurality of equally spaced blades 3a of the cutter section 3, and the - strands are divided into groups of several to several tens of fiber bundles. In addition, when dividing - strand 1 into a plurality of fiber bundle groups, there is no restriction on the number of divisions. The larger the number of divisions and the more finely the strands 1 are dispersed, the more effective it is to prevent the development of cracks, which will be described later, so it is desirable to divide the strands into as many parts as possible.
次に、多数のｌｌｌ１束群に分割されたストランド１は
搬送ロール４を経てチョッパー５へ搬送され、ここで約
１インチの長さに切断され分割チョツプドストランド１
０となる。これで分割・切断工程を終了する。なおこの
分割・切断工程は、分割、切断の順序で行なうのが好ま
しいが、場合によっては切断後、分割することも可能で
ある。ただし、後者の場合、切断されたチョツプドスト
ランドを圧延ローラへ搬送し、圧延ローラで偏平になる
まで押しつぶす作業をいかに効率よく行なうかが課題と
なる。Next, the strand 1 divided into a large number of lll1 bundle groups is conveyed to a chopper 5 via a conveyor roll 4, where it is cut into lengths of about 1 inch and divided into chopped strands 1.
It becomes 0. This completes the dividing/cutting process. Note that this dividing/cutting process is preferably performed in the order of dividing and cutting, but depending on the case, it is also possible to perform dividing after cutting. However, in the latter case, the problem is how efficiently the chopped strands are transported to rolling rollers and crushed by the rolling rollers until they become flat.
次いで複合工程に移る。この複合工程では、第２図に示
すような従来公知の装置と同様のＳ！置を使用すること
が出来る。この工程でのプロセスを説明すると、上記分
割切断工程で得られた分割チョツプドストランド１０を
、第２図に示すようにシートロール１５から供給される
プラスチックシート１２上に落下させ、シート１２上に
２次元的に分散させる。このプラスチックシート１２上
に分散された分割チョツプドストランド１０には樹脂留
め１８から供給される不飽和ポリエステル硬化用有機過
酸化物、離型剤および増粘剤とからなる樹脂成分が含浸
する。プラスチックシート１２上に落下した分割チョツ
プドストランド１０は前述のように約１インチの長さに
切断されており、かつ繊維軸方向に沿っても切断されて
いるため、非常に細かく多数の細い繊維束に分割されて
いる（第３図参照）。Next, move on to the composite process. In this combined process, the S! You can use the To explain the process in this step, as shown in FIG. distributed two-dimensionally. The divided chopped strands 10 dispersed on the plastic sheet 12 are impregnated with a resin component consisting of an organic peroxide for curing the unsaturated polyester, a mold release agent, and a thickener supplied from the resin retainer 18. The chopped strands 10 that have fallen onto the plastic sheet 12 are cut into approximately 1-inch lengths as described above, and are also cut along the fiber axis direction, so they are very finely divided into many thin pieces. It is divided into fiber bundles (see Figure 3).
更にシートロール１６から樹脂留め１つによって前述と
同様の樹脂成分が塗布されたシートフィルム１７が供給
され、分割チョツプドストランド１０をプラスチックシ
ート１２との間で挟持する。Further, a sheet film 17 coated with the same resin component as described above is supplied from the sheet roll 16 by one resin clamp, and the divided chopped strands 10 are sandwiched between the sheet film 17 and the plastic sheet 12.
プラスチックシート１２上に２次元的に分散された分割
チョツプドストランド１０に各シート１２及び１７に塗
布された樹脂成分が含浸し、分割チョツプドストランド
１０と一体化し巻取りロール２０により巻取られる。こ
れによりＳＭＣが得られる。なお、この単層ＳＭＣを所
定の大きさに切り出し、プラスチックシート１２および
１７を剥離し、単層ＳＭＣを積層して多層ＳＭＣとして
もよい。ＳＭＣの成形はプラスチックシート１２．１７
が剥離された状態で分割チョツプドストランド１０を積
層し、加熱型内で加熱加圧して板状のＳＭＣ成形品を得
る。なお、本実施例では、ＳＭＣを製造する場合の製造
方法を示したが、他の繊維強化樹脂組成物、例えばＢＭ
Ｃ、ハイブリッドＳＭＣなどの製造方法にも適用できる
ことはいうまでもない。The divided chopped strands 10 two-dimensionally dispersed on the plastic sheet 12 are impregnated with the resin component applied to each sheet 12 and 17, and are integrated with the divided chopped strands 10 and wound up by a winding roll 20. It will be done. This yields SMC. Incidentally, this single-layer SMC may be cut out to a predetermined size, the plastic sheets 12 and 17 may be peeled off, and the single-layer SMC may be laminated to form a multi-layer SMC. SMC molding is plastic sheet 12.17
The divided chopped strands 10 are laminated in a state in which they are peeled off, and heated and pressed in a heating mold to obtain a plate-shaped SMC molded product. In addition, in this example, a manufacturing method for manufacturing SMC was shown, but other fiber reinforced resin compositions, such as BM
Needless to say, the present invention can also be applied to methods of manufacturing C, hybrid SMC, and the like.
（実験）
上記実施例による製造方法により製造された繊維強化樹
脂組成物と、これとの比較例として前述した従来方法に
よって３種類のｍ維強化樹脂組成物を製造した。上記実
施例及び比較例としての単層ＳＭＣを１０層積層し、温
度１５０℃、圧力１５０ｋＱ／ｃｍ’で３分間加圧成形
し、厚さ３ ｍｍノ板状成形品を得た。これらの成形品
により曲げ剛性、曲げ強さ、疲労特性等の力学特性を測
定し、その測定結果を表に表した。(Experiment) The fiber-reinforced resin composition produced by the production method according to the above example and three types of m-fiber-reinforced resin compositions were produced by the conventional method described above as comparative examples. Ten layers of single-layer SMC as the above examples and comparative examples were laminated and pressure molded at a temperature of 150°C and a pressure of 150 kQ/cm' for 3 minutes to obtain a plate-shaped molded product with a thickness of 3 mm. Mechanical properties such as bending rigidity, bending strength, and fatigue properties were measured using these molded products, and the measurement results are shown in the table.
なお、剛性及び強度は幅２５ＩＩｌｌ＊、厚さ３ｍｍの
試験片をスパン間８０ｍｌ１ｌの条件下で三点曲げ試験
することによって求めた。また疲労特性は幅２０ｍ＋１
１厚さ３ｍｍ、長さ２２０ｍｍの試験片を用いて、最低
応力１ｋｇ／ｍｍ２、最高応力１０ｋｇ／＋ｎ１の引っ
張り応力を周波数１０Ｈｚで繰返し負荷することによっ
て求め、試料の破断に至るまでの繰返し回数を比較した
。The rigidity and strength were determined by performing a three-point bending test on a test piece with a width of 25IIll* and a thickness of 3mm under conditions of a span distance of 80ml11. Also, the fatigue characteristics are 20m wide + 1
1 Using a test piece with a thickness of 3 mm and a length of 220 mm, the tensile stress of a minimum stress of 1 kg/mm2 and a maximum stress of 10 kg/+n1 is repeatedly applied at a frequency of 10 Hz, and the number of repetitions until the sample breaks is determined. compared.
（以下余白）
表に示されているように、本実施例としては集 １束
本数が１２０００本の炭素繊維ストランドを使 （用
し、そのストランドを１２本の繊維集束群に分割した。(The following is a blank space.) As shown in the table, in this example, carbon fiber strands having 12,000 fiber bundles were used, and the strands were divided into 12 fiber bundle groups.
従って分割された一本のストランドは約１０００本のフ
ィラメントから構成されている。Therefore, one divided strand is composed of approximately 1000 filaments.
比較例１では１２０００本の集束本数の炭素繊維ストラ
ンドを１本のまま使用した。また比較例２では集束本数
が１０００本のストランドを最初から供給した。また比
較例３としてサイジング剤（集束剤）を除去してブロワ
で開繊して繊維強化樹脂組成物を製造した。In Comparative Example 1, 12,000 carbon fiber strands were used as they were. Furthermore, in Comparative Example 2, strands with a bundled number of 1000 strands were supplied from the beginning. Further, as Comparative Example 3, a fiber-reinforced resin composition was produced by removing the sizing agent (sizing agent) and opening the fibers with a blower.
本実施例の製造方法で製造した繊維強化樹脂組成物は従
来の製造方法によって得られた比較例１に比較して、曲
げ剛性で約１０％、曲げ強さで約４０％、引張り一引張
り疲労寿命で約１０３ （１１；向上していることがわ
かる。Compared to Comparative Example 1 obtained by the conventional manufacturing method, the fiber-reinforced resin composition manufactured by the manufacturing method of this example had a bending rigidity of about 10%, a bending strength of about 40%, and a tensile fatigue strength of about 10%. It can be seen that the lifespan has improved by about 103 (11).
また、比較例２は上記のように集束本数が１０００本の
ストランドを最初から供給し、従来の製造方法で作製し
たＳＭＣ成形品である。表よりわかる様に、本発明方法
で製造したＳＭＣ成形品は慣初から細かいストランドを
用いて製造した比較列２とほとんど力学特性の差はなく
、むしろストランドを分割する際に更に繊維束が割れて
分割数よりもむしろ多く分割するために、力学特性がわ
ずかに向上している。Moreover, Comparative Example 2 is an SMC molded product manufactured by a conventional manufacturing method, in which strands having a bundled number of 1000 are supplied from the beginning as described above. As can be seen from the table, there is almost no difference in mechanical properties between the SMC molded products manufactured by the method of the present invention and comparison row 2, which was manufactured using fine strands from the beginning. The mechanical properties are slightly improved due to the large number of splits rather than the number of splits.
また、比較例３の場合、繊維が一本一本に分散し、かさ
高くなって樹脂の含浸が困難となるため、樹脂の含浸が
可能な範囲内でＳＭＣを製造し、成形した。そのため繊
維の最大の体積分率は１０％となった。この様に比較例
３の場合、本実施例と比べて繊維の充填量が非常に少な
いためにＳＭＣ成形品の特性は著しく低下しているのが
わかる。In addition, in the case of Comparative Example 3, the fibers were dispersed one by one and became bulky, making it difficult to impregnate with resin, so SMC was manufactured and molded within a range where resin impregnation was possible. Therefore, the maximum volume fraction of fibers was 10%. As described above, in the case of Comparative Example 3, it can be seen that the characteristics of the SMC molded product are significantly deteriorated because the amount of fiber filling is very small compared to the present example.
上記の実験によれば、従来の比較例１、比較例２および
比較例３のＳＭＣ成形品に外力が作用すると、応力の集
中が発生し、第２図に示すように、まず、チョツプドス
トランド６０内部にクラック６０ａが発生する。これは
主として繊維と樹脂の界面の剥離破壊によるものである
（チョツプドストランド内クラック）。更に外力が増加
すると、第３図に示すようにクラック６０ａは、一つの
チョップドストランド６０と他のチョツプドストランド
６０の間に進展する（クラック６０ｂ）。これは、チョ
ツプドストランド６０の相互間の繊維方向が異なるため
、チョツプドストランド６０間に大きな剪断力が作用し
、その領域にチョツプドストランド６０内のクラック６
０ａが進展したことによると考えられている。つまりＳ
ＭＣ成形品の破壊は、まず、チョツプドストランド６０
内で界面破壊が発生し、それが起点となってチョツプド
ストランド６０の相互の境界領域にクラックが進展し、
最終的には破断が発生する。ここで、使用した繊維を分
析してみたところ、繊維自体の破壊はほとんど発生して
いないことを見い出した。According to the above experiment, when an external force acts on the conventional SMC molded products of Comparative Example 1, Comparative Example 2, and Comparative Example 3, stress concentration occurs, and as shown in FIG. A crack 60a occurs inside the strand 60. This is mainly due to peeling failure at the interface between the fiber and the resin (chopped strand crack). When the external force further increases, the crack 60a develops between one chopped strand 60 and the other chopped strand 60 (crack 60b), as shown in FIG. This is because the fiber directions of the chopped strands 60 are different, so a large shearing force acts between the chopped strands 60, causing cracks in the chopped strands 60 to appear in that area.
It is thought that this is due to the development of 0a. In other words, S
Destruction of MC molded products begins with chopped strand 60.
An interfacial fracture occurs within the chopped strands, and this serves as a starting point for a crack to develop in the mutual boundary area of the chopped strands 60.
Eventually a break will occur. When the fibers used were analyzed, it was found that there was almost no destruction of the fibers themselves.
このように成形品の破壊は一方向繊維強化複合材料と異
なり、強化繊維−本一本の破断に基づくものではなく、
チョツプドストランドの集合体におけるＩＩと樹脂、あ
るいはチョツプドストランド間の境界領域の破壊である
と考えられる。この破壊プロセスから、成形品の強度向
上を考えた場合、繊維自体の強度を向上させることは有
効でなく、むしろ、本発明のようにチョツプドストラン
ド間の境界領域の強度を向上させることが有効であるこ
とが知見された。In this way, unlike unidirectional fiber-reinforced composite materials, the fracture of the molded product is not based on the rupture of a single reinforcing fiber.
This is considered to be destruction of II and the resin in the aggregate of chopped strands, or of the boundary area between the chopped strands. From this destruction process, when considering improving the strength of the molded product, it is not effective to improve the strength of the fiber itself, but rather, it is not effective to improve the strength of the boundary area between chopped strands as in the present invention. It was found to be effective.
［発明の効果］
本発明の製造方法によって得られるＩｌ維強化樹脂組成
物は、細かいストランドが微細に分散した構造となって
いる。そのためこの繊維強化樹脂組成物で製造した成形
体に外力が作用すると、従来のＳＭＣ，ＳＭＣ成形品の
様な、応力集中がなくなり、ストランド内クラックが発
生しにくくなる。[Effects of the Invention] The Il fiber reinforced resin composition obtained by the production method of the present invention has a structure in which fine strands are finely dispersed. Therefore, when an external force is applied to a molded article manufactured from this fiber-reinforced resin composition, there is no stress concentration unlike in conventional SMC and SMC molded products, and cracks in the strands are less likely to occur.
またストランドとストランド間の剪断応力も平均化され
、剪断応力の集中もなくなり、ストランド問クラックの
発生が抑制される。また仮にクラックが発生しても繊維
束が非常に細く分散されているために、クラックの進展
が抑制され、そのため疲労特性が飛躍的に向上する。ま
た、本発明の製造方法により得られるストランドを細く
分割してなる繊維強化樹脂組成物と、これと同様の集束
本数からなるストランドを使用して製造したＳＭＣ。In addition, the shear stress between the strands is averaged, concentration of shear stress is eliminated, and the occurrence of cracks between the strands is suppressed. Furthermore, even if a crack occurs, the fiber bundles are very finely dispersed, so the crack propagation is suppressed, and therefore the fatigue properties are dramatically improved. Further, an SMC manufactured using a fiber-reinforced resin composition obtained by dividing a strand obtained by the manufacturing method of the present invention into thin pieces, and a strand comprising a similar number of bundled strands.
ＳＭＣ成形品との力学特性に両者殆んど差がない。There is almost no difference in mechanical properties between the two and SMC molded products.
従って、一般に集束本数の少ない炭素繊維ストランドの
価格が飛躍的上昇することを考慮すると、本発明の製造
方法により製造されるＩ帷強化樹脂組成物は低価格で、
高性能なものとなる。Therefore, considering that the price of carbon fiber strands with a small number of bundled strands generally increases dramatically, the I-strip reinforced resin composition produced by the production method of the present invention can be produced at a low price.
It has high performance.
第１図は、本発明のａＩ維強化樹脂相成物の製造方法の
一実施例の工程部分を示す部分概略図である。第２図は
、本発明の繊維強化樹脂組成物の製造方法の一実施例の
工程部分を説明する概略図である。第３図は本発明によ
り製造された繊維強化樹脂組成物の概略図である。第４
図は従来のＳＭＣの製造方法の全体の工程を示す概略構
成図であり、第５図は従来方法により製造されたＳＭＣ
の概略図である。第６図はＳＭＣ成形品におけるストラ
ンド内部のクラックの発生状態を説明する説明図である
。第７図はＳＭＣ成形品におけるストランド間のクラッ
ク発生状況を示す概略図である。
１・・・ストランド
１０・・・分割チョップドストランドFIG. 1 is a partial schematic diagram showing a process part of an embodiment of the method for producing an aI fiber-reinforced resin phase composition of the present invention. FIG. 2 is a schematic diagram illustrating a process portion of an embodiment of the method for producing a fiber-reinforced resin composition of the present invention. FIG. 3 is a schematic diagram of a fiber-reinforced resin composition produced according to the present invention. Fourth
The figure is a schematic diagram showing the entire process of a conventional SMC manufacturing method, and FIG. 5 shows an SMC manufactured by the conventional method.
FIG. FIG. 6 is an explanatory diagram illustrating the occurrence of cracks inside a strand in an SMC molded product. FIG. 7 is a schematic diagram showing the occurrence of cracks between strands in an SMC molded product. 1...Strand 10...Divided chopped strand
Claims (2)
定長さに切断するとともに軸方向に分割し、分割チョッ
プドストランドとする分割切断工程と、得られた分割チ
ョップドストランドを少なくとも二次元的に分散させる
とともに樹脂成分と一体化させる複合工程と、 からなることを特徴とする繊維強化樹脂組成物の製造方
法。(1) A dividing and cutting step in which a strand obtained by bundling a large number of single fibers is cut into a predetermined length and divided in the axial direction to produce divided chopped strands, and the resulting divided chopped strands are at least two-dimensionally A method for producing a fiber-reinforced resin composition, characterized by comprising: a composite step of dispersing the composition into a resin component and integrating the composition with a resin component.
に押圧して行う特許請求の範囲第１項記載の製造方法。(2) The manufacturing method according to claim 1, wherein the division in the dividing and cutting step is performed by pressing the strand in the lateral direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62322373A JPH01163219A (en) | 1987-12-19 | 1987-12-19 | Production of fiber-reinforced resin composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62322373A JPH01163219A (en) | 1987-12-19 | 1987-12-19 | Production of fiber-reinforced resin composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01163219A true JPH01163219A (en) | 1989-06-27 |
Family
ID=18142921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62322373A Pending JPH01163219A (en) | 1987-12-19 | 1987-12-19 | Production of fiber-reinforced resin composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01163219A (en) |
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-
1987
- 1987-12-19 JP JP62322373A patent/JPH01163219A/en active Pending
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