JP2014019707A - Sheet molding compound - Google Patents
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- JP2014019707A JP2014019707A JP2012156173A JP2012156173A JP2014019707A JP 2014019707 A JP2014019707 A JP 2014019707A JP 2012156173 A JP2012156173 A JP 2012156173A JP 2012156173 A JP2012156173 A JP 2012156173A JP 2014019707 A JP2014019707 A JP 2014019707A
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- 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
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Abstract
Description
本発明は、シートモールディングコンパウンド（以下、ＳＭＣ）において、ガラス繊維（以下、ＧＦ）と炭素繊維（以下、ＣＦ）をブレンド比、トウサイズ、カット長さ等を適切に設定して併用することで、ＧＦとＣＦとのブレンド品でＣＦ１００％品と同等の物性を発現するシートモールディングコンパウンドに関するものである。 In the sheet molding compound (hereinafter referred to as SMC), the present invention uses glass fiber (hereinafter referred to as GF) and carbon fiber (hereinafter referred to as CF) by appropriately setting the blend ratio, tow size, cut length, etc. in combination. The present invention relates to a sheet molding compound which is a blended product of GF and CF and exhibits physical properties equivalent to those of a 100% CF product.
ＳＭＣは、金型内で加熱加圧されると、補強繊維と樹脂組成物とが一体として流動してキャビティを充填するので、部分的に肉厚の異なるもの、リブ・ボスを有するものなど各種形状の成形品を得るのに有利な中間材料である。 When SMC is heated and pressurized in a mold, the reinforcing fibers and the resin composition flow as one body to fill the cavity, so various types such as those with partially different thickness, ribs and bosses, etc. It is an advantageous intermediate material for obtaining shaped articles.
一方、ＳＭＣ中の強化繊維として、炭素繊維だけを用いた場合には、流動性に優れるため賦形の自由度が高いと共に成形品の剛性が高く、例えば自動車等産業用部材に検討されているが、炭素繊維の価格が高いため、実用化されにくい問題があった。 On the other hand, when only carbon fiber is used as the reinforcing fiber in SMC, the fluidity is excellent, so the degree of freedom of shaping is high and the rigidity of the molded product is high, and it is being studied for industrial members such as automobiles. However, since the price of carbon fiber is high, there is a problem that it is difficult to put into practical use.
例えば特許文献１には、炭素繊維束の分散状態を最適化すれば、レジントランスファーモールディング法（ＲＴＭ）により性能の高い成形品が得られることが示されているが、ＲＴＭ法の成形サイクルはオートクレーブ法よりは短いものの、繊維強化材の積層等に時間が必要であり、賦形性も短繊維材料より低いため、複雑な形状を持つ産業用途部材の量産方法としてはプレス成形より劣る。 For example, Patent Document 1 shows that if the dispersion state of the carbon fiber bundle is optimized, a molded product with high performance can be obtained by the resin transfer molding method (RTM). However, the molding cycle of the RTM method is an autoclave. Although it is shorter than the method, it takes time for the lamination of the fiber reinforcement and the shapeability is lower than that of the short fiber material, so that it is inferior to press molding as a mass production method for industrial use members having complicated shapes.
また特許文献２には、炭素繊維を使用したシートモールディングコンパウンドについての記載があるが、コストを低減するための方法は提案されていない。 Patent Document 2 describes a sheet molding compound using carbon fibers, but no method for reducing the cost has been proposed.
本発明の課題は、安価で、実用性に優れるＳＭＣを提供することである。 An object of the present invention is to provide an SMC that is inexpensive and excellent in practicality.
本発明は、炭素繊維とガラス繊維と樹脂組成物からなるシートモールディングコンパウンドであって、
シートモールディングコンパウンドに含まれる全ての繊維の体積の合計が、シートモールディングコンパウンドの体積の３５〜５５％、炭素繊維トウの総体積とガラス繊維ストランドの総体積の比が、４５／５５〜８０／２０であり、
炭素繊維トウの長さが５〜６０ｍｍ、炭素繊維トウの目付けが５０〜１６００ｍｇ／ｍ、
ガラス繊維ストランドの長さが５〜６０ｍｍ、ガラス繊維ストランドの目付けが４０〜１０００ｍｇ／ｍ、
１本の炭素繊維トウと１本のガラス繊維ストランドの体積比（炭素繊維トウの単位体積／ガラス繊維ストランドの単位体積）が１０以下であるシートモールディングコンパウンドである。なお、単位体積は、１本の炭素繊維トウまたは、１本のガラス繊維ストランドの体積をその質量で割って求めた値、目付は、カット後の１本の炭素繊維トウまたは、１本のガラス繊維ストランドの質量を、長さで割って求めた値、体積は、１本の炭素繊維トウまたは、１本のガラス繊維ストランドの質量をそれぞれの比重で割って求めた値である。
The present invention is a sheet molding compound comprising carbon fiber, glass fiber and a resin composition,
The total volume of all the fibers contained in the sheet molding compound is 35 to 55% of the volume of the sheet molding compound, and the ratio of the total volume of the carbon fiber tow and the total volume of the glass fiber strand is 45/55 to 80/20. And
The length of the carbon fiber tow is 5 to 60 mm, the weight of the carbon fiber tow is 50 to 1600 mg / m,
The length of the glass fiber strand is 5 to 60 mm, the basis weight of the glass fiber strand is 40 to 1000 mg / m,
A sheet molding compound in which the volume ratio of one carbon fiber tow to one glass fiber strand (unit volume of carbon fiber tow / unit volume of glass fiber strand) is 10 or less. The unit volume is a value obtained by dividing the volume of one carbon fiber tow or one glass fiber strand by its mass, and the basis weight is one carbon fiber tow after cutting or one glass. The value and volume obtained by dividing the mass of the fiber strand by the length are values obtained by dividing the mass of one carbon fiber tow or one glass fiber strand by the specific gravity.
本発明によれば、各繊維の長さ、目付け、両繊維の体積比を適切に設定することで、ガラス繊維と炭素繊維の混合品で構成されるＳＭＣであっても、炭素繊維だけで構成されるＳＭＣと同等の物性を発現させることができるものである。 According to the present invention, by appropriately setting the length of each fiber, the basis weight, and the volume ratio of both fibers, even SMC composed of a mixture of glass fiber and carbon fiber is composed only of carbon fiber. Can exhibit the same physical properties as SMC.
本発明によれば、炭素繊維トウとガラス繊維ストランドと樹脂組成物からなるシートモールディングコンパウンドであって、
シートモールディングコンパウンドに含まれる全ての繊維の体積の合計が、シートモールディングコンパウンドの体積の３５〜５５％、炭素繊維トウの総体積とガラス繊維ストランドの総体積の比が、４５／５５〜８０／２０であり、
炭素繊維トウの長さが５〜６０ｍｍ、目付けが５０〜１６００ｍｇ／ｍ、
ガラス繊維ストランドの長さが５〜６０ｍｍ、目付けが４０〜１０００ｍｇ／ｍ、
１本の炭素繊維トウと１本のガラス繊維ストランドの体積比（炭素繊維トウの単位体積／ガラス繊維ストランドの単位体積）が１０以下であるシートモールディングコンパウンドであることが必要である。
According to the present invention, a sheet molding compound comprising a carbon fiber tow, a glass fiber strand, and a resin composition,
The total volume of all the fibers contained in the sheet molding compound is 35 to 55% of the volume of the sheet molding compound, and the ratio of the total volume of the carbon fiber tow and the total volume of the glass fiber strand is 45/55 to 80/20. And
The length of the carbon fiber tow is 5 to 60 mm, the basis weight is 50 to 1600 mg / m,
The glass fiber strand has a length of 5 to 60 mm, a basis weight of 40 to 1000 mg / m,
It is necessary that the sheet molding compound has a volume ratio (unit volume of carbon fiber tow / unit volume of glass fiber strand) of one carbon fiber tow and one glass fiber strand of 10 or less.
本発明のＳＭＣを構成するシートモールディングコンパウンドに含まれる全ての繊維の体積の合計が、シートモールディングコンパウンドの体積の３５〜５５％であれば、樹脂組成物を十分に繊維に含浸させることができ、プレス成形時に良好な流動性が得られるとともに成形物に十分な機械的特性が得られるので好ましい。
炭素繊維トウの総体積とガラス繊維ストランドの総体積の比が、４５／５５〜８０／２０であれば、ガラス繊維と炭素繊維を合わせた繊維強化材から製造された成形物が同じ体積の炭素繊維のみから製造された成形物と同等な機械的特性が得られるので好ましい。
炭素繊維トウの長さが、５〜６０ｍｍの範囲であれば、プレス成形時に良好な流動性が得られるとともに成形物に十分な機械的特性が得られるので好ましい。
If the total volume of all the fibers contained in the sheet molding compound constituting the SMC of the present invention is 35 to 55% of the volume of the sheet molding compound, the fiber can be sufficiently impregnated with the resin composition, It is preferable because good fluidity can be obtained during press molding and sufficient mechanical properties can be obtained for the molded product.
If the ratio of the total volume of the carbon fiber tow and the total volume of the glass fiber strand is 45/55 to 80/20, the molded product produced from the fiber reinforcement combined with the glass fiber and the carbon fiber has the same volume of carbon. It is preferable because mechanical properties equivalent to those of a molded product produced only from fibers can be obtained.
If the length of the carbon fiber tow is in the range of 5 to 60 mm, it is preferable because good fluidity can be obtained during press molding and sufficient mechanical properties can be obtained for the molded product.
さらに、本発明のＳＭＣを構成する炭素繊維トウの目付が、５０〜１６００ｍｇ／ｍであれば、より均一で高物性の成形品が得られるので好ましい。 Furthermore, if the basis weight of the carbon fiber tow constituting the SMC of the present invention is 50 to 1600 mg / m, a more uniform and high physical property molded product can be obtained, which is preferable.
本発明のＳＭＣを構成するガラス繊維ストランドの長さが、５〜６０ｍｍの範囲であれば、炭素繊維の場合と同様に、プレス成形時に良好な流動性が得られるとともに成形物に十分な機械的特性が得られるので好ましい。 If the length of the glass fiber strand constituting the SMC of the present invention is in the range of 5 to 60 mm, as in the case of carbon fiber, good fluidity can be obtained at the time of press molding and sufficient mechanical strength for the molded product. It is preferable because characteristics can be obtained.
さらに、本発明のＳＭＣを構成するガラス繊維ストランドの目付が、４０〜１６００ｍｇ／ｍであれば、炭素繊維の場合と同様により均一で高物性の成形品が得られる。 Furthermore, if the basis weight of the glass fiber strand constituting the SMC of the present invention is 40 to 1600 mg / m, a molded product having more uniform and high physical properties can be obtained as in the case of carbon fiber.
本発明のＳＭＣを構成する１本の炭素繊維トウと１本のガラス繊維ストランドの体積比（炭素繊維トウの単位体積／ガラス繊維ストランドの単位体積）が１０以下であると、炭素繊維トウとガラス繊維ストランドを混合した時の分散性が良く、機械的物性がより均一な成形品が得られるので好ましい。 When the volume ratio (unit volume of carbon fiber tow / unit volume of glass fiber strand) of one carbon fiber tow and one glass fiber strand constituting the SMC of the present invention is 10 or less, carbon fiber tow and glass This is preferable because a molded article having good dispersibility when mixed with fiber strands and more uniform mechanical properties can be obtained.
本発明で使用される樹脂組成物は、ＳＭＣを製造する際に、製造に適した粘度を発現し、さらに必要に応じてＳＭＣを取り扱う際に取り扱い性の良好な粘度まで増粘する性質を有する樹脂であればどれでも使用できる。 The resin composition used in the present invention expresses a viscosity suitable for production when producing SMC, and further has a property of increasing the viscosity to good viscosity when handling SMC as necessary. Any resin can be used.
本発明で使用される樹脂組成物としては、熱硬化性樹脂を含む樹脂組成物が好ましく用いることができる。熱硬化性樹脂としては、例えば、エポキシ樹脂、ビニルエステル樹脂、不飽和ポリエステル樹脂、ポリイミド樹脂、マレイミド樹脂、フェノール樹脂等が挙げられる。強化繊維として炭素繊維を用いる場合は、炭素繊維との接着性の点からエポキシ樹脂やビニルエステル樹脂を用いることがさらに好ましい。 As the resin composition used in the present invention, a resin composition containing a thermosetting resin can be preferably used. Examples of the thermosetting resin include an epoxy resin, a vinyl ester resin, an unsaturated polyester resin, a polyimide resin, a maleimide resin, and a phenol resin. When carbon fiber is used as the reinforcing fiber, it is more preferable to use an epoxy resin or a vinyl ester resin from the viewpoint of adhesiveness with the carbon fiber.
熱硬化性樹脂の含有量は、特に制限されないが、重合性単量体や増粘剤、下記の各種添加剤を配合した樹脂組成物として、樹脂組成物の質量含有率がＳＭＣ中３０〜７０質量％の範囲が好ましい。熱硬化性樹脂の含有量が３０質量％以上では樹脂組成物の炭素繊維への含浸具合が良好となり、７０質量％以下では樹脂成形品の機械強度が良好となる傾向にある。さらに、樹脂組成物の含有量は、良好な含浸性を得るために３５質量％以上がより好ましく、４０質量％以上が特に好ましい。また、樹脂組成物の含有量は成形品の機械強度の点から６５質量％以下がより好ましく、６０質量％以下が特に好ましい。 Although content in particular of a thermosetting resin is not restrict | limited, As a resin composition which mix | blended a polymerizable monomer, a thickener, and the following various additives, the mass content rate of a resin composition is 30-70 in SMC. A range of mass% is preferred. When the content of the thermosetting resin is 30% by mass or more, the carbon fiber impregnation condition of the resin composition is good, and when it is 70% by mass or less, the mechanical strength of the resin molded product tends to be good. Furthermore, the content of the resin composition is more preferably 35% by mass or more and particularly preferably 40% by mass or more in order to obtain good impregnation properties. Further, the content of the resin composition is more preferably 65% by mass or less, and particularly preferably 60% by mass or less from the viewpoint of the mechanical strength of the molded product.
重合性単量体の種類と熱硬化性樹脂の種類の組み合わせは、使用する熱硬化性樹脂に適した重合性単量体を使用する限り特に制限されず、例えば上に示したビニルエステル樹脂、不飽和ポリエステル樹脂の場合はスチレン系または（メタ）アクリル系単量体またはそれらの混合系等の重合性単量体が好適で、エポキシ樹脂の場合はエポキシ基を含有するモノマーが好適であり、１種または複数の重合性単量体を任意に組み合わせて使用することができる。
増粘剤は使用する熱硬化性樹脂に適した公知のものから選ぶことができる。酸化マグネシウムや酸化カルシウム等の金属酸化物やＭＤＩやその変性物等のイソシアネート類、有機過酸過物等を使用する方法が一般的である。
The combination of the kind of the polymerizable monomer and the kind of the thermosetting resin is not particularly limited as long as the polymerizable monomer suitable for the thermosetting resin to be used is used. For example, the vinyl ester resin shown above, In the case of an unsaturated polyester resin, a polymerizable monomer such as a styrene-based or (meth) acrylic monomer or a mixture thereof is preferable, and in the case of an epoxy resin, a monomer containing an epoxy group is preferable, One or more polymerizable monomers can be used in any combination.
The thickener can be selected from known ones suitable for the thermosetting resin used. A method using metal oxides such as magnesium oxide and calcium oxide, isocyanates such as MDI and modified products thereof, organic peracid peroxides, and the like is common.
本発明のＳＭＣには、炭素繊維と樹脂組成物のほかに、必要により無機充填剤、重合開始剤、重合禁止剤、顔料、内部離型剤等も使用することができる。 In addition to the carbon fiber and the resin composition, the SMC of the present invention may contain an inorganic filler, a polymerization initiator, a polymerization inhibitor, a pigment, an internal mold release agent and the like as necessary.
無機充填剤の種類は、特に制限は無く、例えば、炭酸カルシウム、炭酸マグネシウム、水酸化アルミニウム、水酸化マグネシウム、水酸化カルシウム、シリカ、溶融シリカ、硫酸バリウム、酸化チタン、酸化マグネシウム、酸化カルシウム、酸化アルミニウム、リン酸カルシウム、タルク、マイカ、クレー、ガラスパウダー等の公知の材料を使用することができ、これらは２種以上を併用することができる。 The type of the inorganic filler is not particularly limited, and examples thereof include calcium carbonate, magnesium carbonate, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, silica, fused silica, barium sulfate, titanium oxide, magnesium oxide, calcium oxide, and oxidation. Known materials such as aluminum, calcium phosphate, talc, mica, clay and glass powder can be used, and two or more of these can be used in combination.
無機充填剤の含有量は軽量化の点から必要最小限の添加にすることが望ましく、０％でも構わない。 The content of the inorganic filler is desirably the minimum addition from the viewpoint of weight reduction, and may be 0%.
硬化剤の種類は、特に制限は無い。使用する樹脂組成物に適した公知の硬化剤から選ぶことができる。例えばビニルエステル樹脂、不飽和ポリエステル樹脂を用いる場合には一般的な有機化酸化物が好ましく、エポキシ樹脂の場合はアミン系や酸無水物系の硬化剤が好ましい。 There is no restriction | limiting in particular in the kind of hardening | curing agent. It can be selected from known curing agents suitable for the resin composition to be used. For example, when a vinyl ester resin or an unsaturated polyester resin is used, a general organic oxide is preferable, and in the case of an epoxy resin, an amine-based or acid anhydride-based curing agent is preferable.
内部離型剤は、特に制限は無い。例えばステアリン酸亜鉛等の脂肪酸金属塩や、ジアルキルスルホコハク酸ナトリウム等の界面活性剤など公知の材料を使用することができる。 The internal mold release agent is not particularly limited. For example, known materials such as fatty acid metal salts such as zinc stearate and surfactants such as sodium dialkylsulfosuccinate can be used.
本発明のＳＭＣの製造方法は、特に制限はなく、例えば、樹脂組成物および他の添加物を、図１に示されるようなＳＭＣマシーン等の公知の装置を用いて炭素繊維に含浸させ、その後に１０〜５０℃の温度で数日間熟成し、増粘させることで製造することができる。 The production method of the SMC of the present invention is not particularly limited. For example, the resin composition and other additives are impregnated into carbon fibers using a known apparatus such as an SMC machine as shown in FIG. It can be manufactured by aging for several days at a temperature of 10 to 50 ° C. and increasing the viscosity.
図１に示されるようなＳＭＣマシーンを用いる場合は、樹脂組成物は炭素繊維への含浸が可能でありかつキャリアフィルム２の脇から液ダレが起こらないような粘度であることが好ましい。また、熟成後の粘度はキャリアフィルムを容易に剥がすことができるような粘度に増粘していることが好ましい。 When an SMC machine as shown in FIG. 1 is used, the resin composition preferably has a viscosity that allows carbon fibers to be impregnated and does not cause dripping from the side of the carrier film 2. Further, the viscosity after aging is preferably increased to such a viscosity that the carrier film can be easily peeled off.
以下、実施例によって、本発明のＳＭＣをより具体的に説明するが、本発明のＳＭＣは実施例に限定されるものではない。実施例で用いた強化繊維、樹脂原料、および各物性の測定方法を、次に示す。 Hereinafter, the SMC of the present invention will be described more specifically with reference to examples, but the SMC of the present invention is not limited to the examples. The reinforcing fibers, resin raw materials, and methods for measuring physical properties used in the examples are shown below.
＜強化繊維＞
・炭素繊維トウ１ 三菱レイヨン社製 ＴＲ５０Ｓ：フィラメント数１２０００本、トウ目付け ８００ｍｇ／ｍ
・炭素繊維トウ２ 三菱レイヨン社製 ＴＲ５０Ｓ：フィラメント数４８０００本、トウ目付け １０００ｍｇ／ｍ
・炭素繊維トウ３ 三菱レイヨン社製 ＴＲ５０Ｓ：フィラメント数２４０００本、トウ目付け １６００ｍｇ／ｍ
・炭素繊維トウ４ 三菱レイヨン社製 ＴＲ５０Ｓ：フィラメント数６０００本、トウ目付け ４００ｍｇ／ｍ
・炭素繊維トウ５ 三菱レイヨン社製 ＴＲ５０Ｓ：フィラメント数３０００本、繊維目付け ２００ｍｇ／ｍ
<Reinforcing fiber>
-Carbon fiber tow 1 Mitsubishi Rayon TR50S: 12,000 filaments, toe weight 800 mg / m
Carbon fiber tow 2 Mitsubishi Rayon TR50S: 48,000 filaments, toe weight 1000mg / m
Carbon fiber tow 3 Mitsubishi Rayon TR50S: 24,000 filaments, tow weight 1600 mg / m
Carbon fiber toe 4 Mitsubishi Rayon TR50S: 6,000 filaments, toe weight 400 mg / m
-Carbon fiber tow 5 manufactured by Mitsubishi Rayon Co., Ltd. TR50S: 3000 filaments, fiber basis weight 200 mg / m
・ガラス繊維ロービング１ 日東紡社製 ＲＳ ４６０ Ａ−７８２ ロービング目付け ４８６０ｍｇ／ｍ、カット長：２５．４ｍｍ ・ Glass fiber roving 1 Nittobo RS 460 A-782 Roving basis weight 4860 mg / m, cut length: 25.4 mm
＜樹脂組成物＞
表１に示した樹脂等をその配合量で加え、混合撹拌し、樹脂組成物を得た。
<Resin composition>
Resins and the like shown in Table 1 were added at the blending amounts, mixed and stirred to obtain a resin composition.
（実施例１）
製造するシートモールディングコンパウンドの目付けが、３１００ｇ／ｍ２になるように、樹脂組成物を所定量フィルム上に塗布し、その塗布面に炭素繊維トウ１を２５．４ｍｍ長にカットしたものと、ガラス繊維ロービング１を４０本のストランド（ガラス繊維ストランド１、目付：１２１．５ｍｇ／ｍ）に分割し、さらに２５．４ｍｍ長にカットしたものを、体積比が、５０／５０となるように混合して散布した後、同様のコンパウンドが塗布されたフィルムで上面を覆って閉じた。ついで、全体を含浸ローラーにかけて同コンパウンドを炭素繊維に含浸させ、引き続きシート状にして巻き取り、２５℃で４日間熟成させ、シートモールディングコンパウンドを得た。
ＳＭＣの組成：
樹脂組成物 ４２．０質量％
炭素繊維トウ１ ２３．８質量％
ガラス繊維ストランド１ ３４．２質量％
Example 1
A resin composition is coated on a film in a predetermined amount so that the basis weight of the sheet molding compound to be manufactured is 3100 g / m 2 , and the carbon fiber tow 1 is cut to 25.4 mm length on the coated surface, and glass The fiber roving 1 is divided into 40 strands (glass fiber strand 1, basis weight: 121.5 mg / m), and further cut to a length of 25.4 mm and mixed so that the volume ratio is 50/50. After spraying, the upper surface was covered with a film coated with the same compound and closed. Subsequently, the whole was put on an impregnation roller to impregnate the same compound into carbon fiber, subsequently wound into a sheet, and aged at 25 ° C. for 4 days to obtain a sheet molding compound.
SMC composition:
Resin composition 42.0 mass%
Carbon fiber tow 1 23.8% by mass
Glass fiber strand 1 34.2% by mass
（実施例２、３、比較例１〜３）
炭素繊維トウ１とガラス繊維ストランド１の体積比を、表２に記載されているように変更して、用いる以外は実施例１と同様にしてシートモールディングコンパウンドを得た。
(Examples 2 and 3, Comparative Examples 1 to 3)
A sheet molding compound was obtained in the same manner as in Example 1 except that the volume ratio of the carbon fiber tow 1 and the glass fiber strand 1 was changed as shown in Table 2 and used.
（実施例４〜８、比較例４，５）
繊維質量含有率を表３のとおりとする以外は実施例２と同様にしてシートモールディングコンパウンドを得た。
(Examples 4 to 8, Comparative Examples 4 and 5)
A sheet molding compound was obtained in the same manner as in Example 2 except that the fiber mass content was as shown in Table 3.
（実施例９，１０、比較例６，７）
炭素繊維トウのトウサイズを表４のとおりとする以外は実施例２と同様にしてシートモールディングコンパウンドを得た。
(Examples 9 and 10, Comparative Examples 6 and 7)
A sheet molding compound was obtained in the same manner as in Example 2 except that the tow size of the carbon fiber tow was changed as shown in Table 4.
（実施例１１，１２、比較例８，９）
ガラス繊維ロービング１からの分割本数を２本、５本、４０本、６０本に変更して、ストランド目付を表５のとおりとする以外は実施例２と同様にしてシートモールディングコンパウンドを得た。
(Examples 11 and 12, Comparative Examples 8 and 9)
A sheet molding compound was obtained in the same manner as in Example 2 except that the number of divisions from the glass fiber roving 1 was changed to 2, 5, 40, and 60, and the basis weight of the strands was changed as shown in Table 5.
（比較例１０〜１２）
炭素繊維トウのトウサイズ、炭素繊維トウ目付を表６のとおりとする以外は比較例８と同様にしてシートモールディングコンパウンドを得た。
(Comparative Examples 10-12)
A sheet molding compound was obtained in the same manner as in Comparative Example 8 except that the tow size of the carbon fiber tow and the carbon fiber toe weight were as shown in Table 6.
（実施例１３〜１５、比較例１３）
炭素繊維トウのカット長さを表７のとおりとする以外は実施例２と同様にしてシートモールディングコンパウンドを得た。
(Examples 13-15, Comparative Example 13)
A sheet molding compound was obtained in the same manner as in Example 2 except that the cut length of the carbon fiber tow was as shown in Table 7.
（実施例１６〜１８、比較例１４）
ガラス繊維ストランドのカット長さを表８のとおりとする以外は実施例２と同様にしてシートモールディングコンパウンドを得た。
シートモールディングコンパウンドの成形は、一般的なプレス成形法に基づいて実施した。１４０℃に温調された鋼材製の３０ｃｍ角の平板金型を用い、２ｍｍ厚みの成形板を成形した。シートモールディングコンパウンドは一辺が２０〜２７ｃｍの範囲の正方形を切り出し、所定枚数を積層することで所定量になるように切り出し使用した。成形圧力は８ＭＰａ、成形時間は５分で成形した。
成形板から曲げ試験ＡＳＴＭ Ｄ７９０、引っ張り試験はＡＳＴＭＤ３０３９に規定された切片を切り出し、機械的特性を評価した。
(Examples 16 to 18, Comparative Example 14)
A sheet molding compound was obtained in the same manner as in Example 2 except that the cut length of the glass fiber strand was as shown in Table 8.
The molding of the sheet molding compound was performed based on a general press molding method. A 2 mm thick molded plate was formed using a 30 cm square flat plate mold made of steel whose temperature was adjusted to 140 ° C. The sheet molding compound was used by cutting out a square having a side of 20 to 27 cm and cutting out a predetermined amount by stacking a predetermined number of sheets. The molding pressure was 8 MPa and the molding time was 5 minutes.
In the bending test ASTM D790 and the tensile test, a section defined in ASTM D3039 was cut out from the molded plate, and the mechanical properties were evaluated.
１…樹脂組成物
２…キャリアフィルム
３…コーター
４…強化繊維
５…チョッパー
６…含浸ロール
７…巻き取りロール
DESCRIPTION OF SYMBOLS 1 ... Resin composition 2 ... Carrier film 3 ... Coater 4 ... Reinforcing fiber 5 ... Chopper 6 ... Impregnation roll 7 ... Winding roll
Claims (1)
シートモールディングコンパウンドに含まれる全ての繊維の体積の合計が、シートモールディングコンパウンドの体積の３５〜５５％、炭素繊維トウの総体積とガラス繊維ストランドの総体積の比が、４５／５５〜８０／２０であり、
炭素繊維トウの長さが５〜６０ｍｍ、炭素繊維トウの目付けが５０〜１６００ｍｇ／ｍ、
ガラス繊維ストランドの長さが５〜６０ｍｍ、ガラス繊維ストランド目付けが４０〜１０００ｍｇ／ｍ、
１本の炭素繊維トウと１本のガラス繊維ストランドの単位体積比（炭素繊維トウ単位体積／ガラス繊維ストランド単位体積）が１０以下であるシートモールディングコンパウンド。 A sheet molding compound comprising a carbon fiber tow, a glass fiber strand, and a resin composition,
The total volume of all the fibers contained in the sheet molding compound is 35 to 55% of the volume of the sheet molding compound, and the ratio of the total volume of the carbon fiber tow and the total volume of the glass fiber strand is 45/55 to 80/20. And
The length of the carbon fiber tow is 5 to 60 mm, the weight of the carbon fiber tow is 50 to 1600 mg / m,
The glass fiber strand length is 5 to 60 mm, the glass fiber strand basis weight is 40 to 1000 mg / m,
A sheet molding compound having a unit volume ratio (carbon fiber tow unit volume / glass fiber strand unit volume) of one carbon fiber tow and one glass fiber strand of 10 or less.
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| US10323133B2 (en) | 2014-09-12 | 2019-06-18 | Mitsubishi Chemical Corporation | Molding material, sheet molding compound, and fiber-reinforced composite material obtained using same |
| JP2019137774A (en) * | 2018-02-09 | 2019-08-22 | ジャパンコンポジット株式会社 | Molding material and molding thereof |
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