JP6266305B2 - Sheet molding compound and molded product using the same - Google Patents
Sheet molding compound and molded product using the same Download PDFInfo
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- JP6266305B2 JP6266305B2 JP2013226908A JP2013226908A JP6266305B2 JP 6266305 B2 JP6266305 B2 JP 6266305B2 JP 2013226908 A JP2013226908 A JP 2013226908A JP 2013226908 A JP2013226908 A JP 2013226908A JP 6266305 B2 JP6266305 B2 JP 6266305B2
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- 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
- C08J5/045—Reinforcing macromolecular compounds with loose or coherent fibrous material with vegetable or animal fibrous material
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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
- C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
- C08J5/245—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using natural fibres
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Description
本発明は、成型材料であるシートモールディングコンパウンド（以下、「ＳＭＣ」と略することもある。）に関するものである。 The present invention relates to a sheet molding compound (hereinafter sometimes abbreviated as “SMC”) which is a molding material.
ＦＲＰ成型法のひとつとして広く採用されているＳＭＣ法は、シート状成型材料を用いる成型方法である。 The SMC method widely adopted as one of the FRP molding methods is a molding method using a sheet-like molding material.
従来、ＦＲＰには、ガラス繊維が強化繊維として使用されている（特許文献１、２）。ガラス繊維が用いられたＦＲＰは、強度に優れ、安価であることがその理由にある。しかしながら、ガラス繊維が用いられたＦＲＰは、廃棄の際に、焼却処分しようとしても、焼却炉等の焼却設備の中に溶融がして固着してしまい、焼却炉の寿命を短くしてしまう。 Conventionally, glass fibers are used as reinforcing fibers in FRP (Patent Documents 1 and 2). The reason is that FRP using glass fiber is excellent in strength and inexpensive. However, FRP using glass fiber melts and adheres to an incinerator such as an incinerator, even if it is discarded, and shortens the life of the incinerator.
また、炭素繊維も、ＦＲＰの強化繊維として用いられるが、高価であるため、広く使用されていない。 Carbon fibers are also used as FRP reinforcing fibers, but are not widely used because they are expensive.
本発明の課題は、ＦＲＰ成型にて使用するＳＭＣにおいて、強化繊維として汎用されているガラス繊維に替えて、安価であり、かつ廃棄において容易に焼却可能なＦＲＰを得ることができるＳＭＣを提供することにある。 An object of the present invention is to provide an SMC capable of obtaining an FRP that is inexpensive and can be easily incinerated in disposal, instead of a glass fiber that is widely used as a reinforcing fiber in an SMC used in FRP molding. There is.
そして、この課題を達成するために検討する過程で、特定の繊維基材を強化繊維として使用したところ、耐衝撃性に優れ、かつ焼却処分が可能であり、かつ、物が成型体に当たったときに発する音について、耳への支障が小さいことを見出し、本発明に到達した。 And, in the process of studying to achieve this problem, when a specific fiber base material was used as a reinforcing fiber, it was excellent in impact resistance and could be incinerated, and the object hit the molded body As a result, the present inventors have found that there are few problems with the ears with respect to the sounds that are sometimes emitted.
すなわち、本発明は、高音域である２５００Ｈｚから１２５００Ｈｚの周波数領域においてノイズ低減する成型品を得るためのシートモールディングコンパウンドであり、
該シートモールディングコンパウンドは、熱硬化性樹脂組成物が短繊維からなるシートに含浸してなるシートモールディングコンパウンドであって、
短繊維が主として木綿繊維であり、
シートが、構成繊維である短繊維同士が三次元的に交絡一体化してなる不織布であり、
シートモールディングコンパウンド中におけるシートの質量比が５〜２５質量％であることを特徴とするシートモールディングコンパウンドを要旨とするものである。
That is, the present invention is a sheet molding compound for obtaining a molded product that reduces noise in a high frequency range of 2500 Hz to 12500 Hz.
The sheet molding compound is I Oh sheet molding compounds thermosetting resin composition obtained by impregnating a sheet made of short fibers,
The short fibers are mainly cotton fibers,
The sheet is a nonwoven fabric in which short fibers that are constituent fibers are entangled and integrated three-dimensionally,
The gist of the sheet molding compound is characterized in that the mass ratio of the sheet in the sheet molding compound is 5 to 25% by mass.
以下、本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail.
本発明は、熱硬化性樹脂組成物が短繊維からなるシートに含浸してなるシートモールディングコンパウンドであり、短繊維が主として木綿繊維である。 The present invention is a sheet molding compound obtained by impregnating a sheet made of short fibers with a thermosetting resin composition, and the short fibers are mainly cotton fibers.
木綿繊維としては、精錬・漂白された漂白木綿繊維を好ましく用いる。漂白木綿繊維は、未晒し木綿（木綿原綿）を漂白した晒し木綿、または、漂白されているが繊維表面に天然油脂が少量付着してなる未脱脂漂白木綿のいずれかを使用するとよい。なお、晒し木綿とは、繊維表面に付着している天然油脂が除去された脱脂綿繊維のことである。また、未脱脂漂白木綿は、特開２００３−２４７１６１号公報に開示されている方法により得ることができる。原綿にはコットンワックス（天然油脂）が約０．６質量％程度付着しているが、未脱脂漂白綿は、０．３〜０．６質量％程度の天然油脂が付着している。 As the cotton fiber, a refined and bleached bleached cotton fiber is preferably used. The bleached cotton fiber may be either bleached cotton obtained by bleaching unbleached cotton (cotton raw cotton) or non-defatted bleached cotton that is bleached but has a small amount of natural oils and fats attached to the fiber surface. In addition, a bleached cotton is the absorbent cotton fiber from which the natural fats and oils adhering to the fiber surface were removed. Non-defatted bleached cotton can be obtained by the method disclosed in JP-A No. 2003-247161. Cotton wax (natural fats and oils) is attached to the raw cotton in an amount of about 0.6% by mass, while non-defatted bleached cotton has an organic fat / fat of about 0.3 to 0.6% by mass attached thereto.
本発明においては、シートを構成する短繊維は、主として木綿繊維によって構成される。ここで、主として木綿繊維によって構成されるとは、構成繊維の多くが木綿繊維であることをいい、具体的には７０質量％以上が木綿繊維であることが好ましい。なお、本発明の目的を損なわない範囲で、他の繊維が含まれてもよく、他の繊維としてはビニロン繊維を用いることが好ましい。ビニロン繊維は、強度が高く寸法安定性に優れるため、得られるＳＭＣもまた、強度と寸法安定性が良好となるからである。 In the present invention, the short fibers constituting the sheet are mainly composed of cotton fibers. Here, being mainly composed of cotton fibers means that most of the constituent fibers are cotton fibers, and specifically, 70% by mass or more is preferably cotton fibers. It should be noted that other fibers may be included as long as the object of the present invention is not impaired, and it is preferable to use vinylon fibers as the other fibers. This is because the vinylon fiber has high strength and excellent dimensional stability, and thus the obtained SMC also has good strength and dimensional stability.
シートは、構成繊維である短繊維同士が三次元的に交絡一体化した不織布である。短繊維同士が三次元的に交絡一体化した不織布は、繊維間に空隙を有するため、熱硬化性樹脂組成物が空隙内に入り込みやすく、良好に一体化する。また、この不織布は、適度な伸度も有するため、立体成型にも適する。構成繊維同士が三次元的に交絡する手段としては、高圧水流を施すことにより繊維同士が交絡一体化した不織布、すなわち、スパンレース法によるスパンレース不織布を好ましく用いられる。スパンレース不織布は、柔軟性があり、一定の伸度があるため取扱いが良好である。不織布の目付は、適宜選択すればよいが、４０〜８０ｇ／ｍ２程度がよい。 The sheet is a nonwoven fabric in which short fibers as constituent fibers are entangled and integrated three-dimensionally. The nonwoven fabric in which the short fibers are entangled and integrated three-dimensionally has voids between the fibers, so that the thermosetting resin composition easily enters the voids and integrates well. Moreover, since this nonwoven fabric also has moderate elongation, it is suitable for three-dimensional molding. As means for entanglement of the constituent fibers three-dimensionally, a nonwoven fabric in which the fibers are entangled and integrated by applying a high-pressure water stream, that is, a spunlace nonwoven fabric by a spunlace method is preferably used. The spunlace nonwoven fabric is flexible and has a certain elongation, so that it is handled well. Although the fabric weight of a nonwoven fabric should just be selected suitably, about 40-80 g / m < 2 > is good.
本発明のＳＭＣは、上記したシートに所定の熱硬化性樹脂組成物を含浸させたものである。熱硬化性樹脂組成物を構成する樹脂は、実使用可能であれば、特に限定されるものではなく、不飽和ポリエステル樹脂、ビニルエステル樹脂、エポキシ樹脂、フェノール樹脂等の熱硬化性樹脂が挙げられる。 The SMC of the present invention is obtained by impregnating the above-described sheet with a predetermined thermosetting resin composition. The resin constituting the thermosetting resin composition is not particularly limited as long as it can be used practically, and examples thereof include thermosetting resins such as unsaturated polyester resins, vinyl ester resins, epoxy resins, and phenol resins. .
また、熱硬化性樹脂組成物中には、充填材を含有させる。充填材は、用途に応じて種々のものが種々の割合で混合使用され、一般に、熱硬化性樹脂１００質量部に対して２００質量部以下の割合で混合するとよい。充填材としては、例えば、炭酸カルシウム、水酸化アルミニウム、ガラス微粉末、ガラスバルーン等が挙げられ、なかでも、炭酸カルシウム、水酸化アルミニウムが一般に使用されている。 Moreover, a filler is contained in the thermosetting resin composition. Various fillers may be mixed and used in various proportions depending on the application. In general, the filler may be mixed at a proportion of 200 parts by mass or less with respect to 100 parts by mass of the thermosetting resin. Examples of the filler include calcium carbonate, aluminum hydroxide, glass fine powder, glass balloon and the like, among which calcium carbonate and aluminum hydroxide are generally used.
さらに、熱硬化性樹脂組成物中に、必要に応じて、硬化剤、離型剤、着色剤、低収縮剤、増粘剤及びその他の公知の添加剤を適宜含有させる。 Furthermore, in the thermosetting resin composition, a curing agent, a release agent, a colorant, a low shrinkage agent, a thickening agent and other known additives are appropriately contained as necessary.
また、本発明のＳＭＣは、一般的なＳＭＣ製造装置を用いて製造可能である。上記した熱硬化性樹脂に、充填剤、硬化剤、低収縮剤、溶媒等を混和させたＳＭＣ用ペーストに増粘剤を添加した後、塗工機によりシートに含浸させることにより得ることができる。より具体的には、例えば、ＳＭＣ用ペーストを、上下に配置されたキャリアフィルムに均一な厚さとなるように塗布し、巻きだし装置から巻き出された所定の大きさの主として木綿繊維からなる短繊維同士が三次元的に交絡一体化してなるシート（不織布）を上記した上下に配置されたキャリアフィルムのＳＭＣ用ペーストに挾み込み、次いで、全体を含浸ロールの間に通して、圧力を加えて不織布をＳＭＣ用ペーストに含浸させた後、ロール状に巻き取るかつづら折りに畳む。またこの後、必要に応じて熟成等を行い、ＳＭＣを得ることができる。熟成に関しては、増粘剤を配合した場合には室温〜６０℃の温度に加熱して熟成することが好ましい。離型フィルムとしては、ポリエチレンフィルム、ポリプロピレンフィルム等を用いるとよい。 Further, the SMC of the present invention can be manufactured using a general SMC manufacturing apparatus. It can be obtained by adding a thickener to a paste for SMC in which a filler, a curing agent, a low shrinkage agent, a solvent, etc. are mixed with the above thermosetting resin, and then impregnating the sheet with a coating machine. . More specifically, for example, an SMC paste is applied to carrier films arranged on the top and bottom so as to have a uniform thickness, and a short length mainly made of cotton fibers unwound from a winding device. A sheet (nonwoven fabric) in which fibers are entangled and integrated three-dimensionally is squeezed into the SMC paste of the carrier film arranged above and below, and then the whole is passed between impregnating rolls to apply pressure. After impregnating the non-woven fabric with the paste for SMC, it is wound up in a roll shape and folded into a fold. Thereafter, aging or the like is performed as necessary to obtain SMC. Regarding aging, when a thickener is blended, it is preferable to ripen by heating to a temperature of room temperature to 60 ° C. As the release film, a polyethylene film, a polypropylene film, or the like may be used.
得られたＳＭＣを用いて成型品を得るには、上金型および下金型を備えた金型を用い、所定の温度と圧力を付与して熱硬化させて所定形状に成型する。なお、このとき、ＳＭＣは、１枚（単層）であっても、複数枚重ねて複層の状態として成型しても、用途に応じて適宜選択すればよい。成型条件としては、特に限定されず、例えば、成型圧力１〜１０ＭＰａ、金型温度１２５〜１５０℃、成型時間３〜７分程度がよい。 In order to obtain a molded product using the obtained SMC, a mold including an upper mold and a lower mold is used, and a predetermined temperature and pressure are applied and thermoset to form into a predetermined shape. At this time, the SMC may be one sheet (single layer), or a plurality of SMCs may be stacked to be molded into a multilayer state, and may be appropriately selected according to the application. The molding conditions are not particularly limited, and for example, a molding pressure of 1 to 10 MPa, a mold temperature of 125 to 150 ° C., and a molding time of about 3 to 7 minutes are preferable.
本発明のＳＭＣの用途としては、特に制限されないが、水回り用成形品に好ましく用いることができ、例えば、浴槽、浴室ユニット、洗面ユニット、トイレユニット、キッチンカウンター、貯水槽等に好ましく用いることができる。 Although it does not restrict | limit especially as a use of SMC of this invention, It can use preferably for the molded product for water around, For example, it is preferably used for a bathtub, a bathroom unit, a wash unit, a toilet unit, a kitchen counter, a water tank etc. it can.
本発明のＳＭＣを用いて得られる成型品は、高音域のノイズが低減される。すなわち、その理由は明確ではないが、物が当たったときに発生する音が抑制され、耳障りになりにくい。すなわち、成型品を打撃したときに発する音（放射音圧レベル）が、２５００Ｈｚから１２５００Ｈｚの周波数領域において、汎用のガラス繊維が強化繊維として用いられているＦＲＰと比較して小さい。２５００Ｈｚから１２５００Ｈｚの周波数領域は、人の可聴周波数でもかなり高音域であり、耳障りに感じやすい領域であるが、本発明の成形品は、この周波領域における放射音圧レベルが小さく、例えば、成型品に物が当たったり擦れたりしたときに発する音、流しの水滴が成型品に落下した際に発する音等のノイズが抑制されて不快な感覚が生じにくい。 The molded product obtained using the SMC of the present invention has reduced high-frequency noise. That is, the reason is not clear, but the sound that is generated when an object hits is suppressed, and it is difficult to be harsh. That is, the sound (radiated sound pressure level) emitted when a molded product is struck is small in the frequency range of 2500 Hz to 12500 Hz compared to FRP in which general-purpose glass fibers are used as reinforcing fibers. The frequency range of 2500 Hz to 12500 Hz is a region that is considerably high sound even at human audible frequencies and is easily harsh, but the molded product of the present invention has a low radiation sound pressure level in this frequency region. Noises such as a sound that is emitted when an object hits or rubs against the object and a sound that is emitted when a water drop of a sink falls on a molded product are suppressed, and an unpleasant sensation is unlikely to occur.
この放射音圧レベルについての評価は、打撃加振に対する音響性能測定により行った。この測定は、日東紡音響エンジニアリング株式会社所有の残響室および無響室（日東紡音響エンジニアリング株式会社、第２音響研究所）にて実施したものである。 This radiation sound pressure level was evaluated by measuring the acoustic performance with respect to impact excitation. This measurement was performed in a reverberation room and an anechoic room (Nittobo Acoustic Engineering Co., Ltd., 2nd Acoustic Research Laboratory) owned by Nittobo Acoustic Engineering Co., Ltd.
まず、計測対象となる試料は、３００ｍｍ（タテ）×３００ｍｍ（ヨコ）のＳＭＣ成型品とし、このＳＭＣ成型品を図１に示すように残響室(音源側)と無響室の間に設置し、残響室側から重さ５０ｇの鉄球を取り付けた振り子でＳＭＣ成形品を打撃加振し、その応答となるＳＭＣ成形品からの放射音圧レベルを無響室側に設置したマイクロホンで測定する。なお、ＳＭＣ成形品は、残響室と無響室の間に取り付けられた木枠に、吊り下げられた状態で設置し、振り子に取り付けられた鉄球は、試料面に対して吊り下げ紐の角度４５°の位置から放され、ＳＭＣ成型品に打撃する。 First, the sample to be measured is a 300 mm (vertical) x 300 mm (horizontal) SMC molded product, and this SMC molded product is installed between the reverberation chamber (sound source side) and the anechoic chamber as shown in FIG. The SMC molded product is hit and excited from the reverberation chamber side with a pendulum attached with a 50 g steel ball, and the radiated sound pressure level from the SMC molded product as a response is measured with a microphone installed on the anechoic chamber side. . The SMC molded product is installed in a suspended state on a wooden frame attached between the reverberation chamber and the anechoic chamber, and the iron ball attached to the pendulum is suspended from the sample surface. It is released from the position at an angle of 45 ° and hits the SMC molded product.
打撃箇所は図２に示すように、試料下から１１．５ｃｍの位置であり、かつ、端から６ｃｍ、１３ｃｍ、２２ｃｍの位置の３箇所とし、１箇所あたりの加振回数１０回で総打撃回数３０打撃加振とし、このときＳＭＣ成型品から発生する音を放射音圧レベルとして計測した。すなわち、１打撃ごとにおけるそれぞれの周波数における音圧レベルを計測し、それぞれの周波数における３０打撃加振にて得られた音圧レベルの平均値を求めた。 As shown in FIG. 2, the number of impacts is 11.5 cm from the bottom of the sample, and 3 locations at 6 cm, 13 cm, and 22 cm from the end. The vibration generated from the SMC molded product at this time was measured as the radiation sound pressure level. That is, the sound pressure level at each frequency for each impact was measured, and the average value of the sound pressure levels obtained by 30 impact excitation at each frequency was determined.
放射音圧レベルは、ある音の音圧の実効値の２乗と基準の音圧の２乗との比の常用対数の１０倍であり、量記号（Ｌｐ単位記号）はデシベル(ｄＢ)である。音圧レベルが６ｄＢ上がると聴感上音の大きさが２倍に感じるといわれている。 The radiation sound pressure level is 10 times the common logarithm of the ratio of the square of the effective value of the sound pressure to the square of the reference sound pressure, and the quantity symbol (Lp unit symbol) is decibel (dB). is there. It is said that when the sound pressure level increases by 6 dB, the volume of the sound will be doubled.
本発明のＳＭＣによれば、耐衝撃性に優れ、焼却処分が可能であるとともに、高温域のノイズを抑制することが可能となるＦＲＰを提供することができる。 According to the SMC of the present invention, it is possible to provide an FRP that has excellent impact resistance, can be incinerated, and can suppress noise in a high temperature range.
以下、実施例に基づいて本発明を説明するが、本発明は実施例に限定されるものではない。 EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, this invention is not limited to an Example.
比較例
ＳＭＣペーストとして、イソ系不飽和ポリエステル樹脂７０質量部及びスチレン系低収縮剤３０質量部、樹脂１００質量部に対して水酸化アルミを充填剤として１８０質量部、安定剤０．０４質量部、硬化剤１．０質量部、トナー３．０質量部、離型剤３．０質量部、増粘剤３.０質量部が配合されたコンパウンドを用意した。
強化繊維として、ガラス繊維をカットしたガラスチョップド繊維を用い、ＳＭＣに対して２０質量％の含有率で上記コンパウンド中に分散させて含浸させたＳＭＣを作製した。ＳＭＣ中におけるガラスチョップド繊維の質量比は、２０質量％とした。
得られたＳＭＣを３００ｍｍ×３００ｍｍの大きさに裁断し、これを６枚積層したものを平板成形用金型に投入し、温度１４０℃、プレス圧８０ｔ、加圧時間２４０秒で熱成型を施し、３００ｍｍ×３００ｍｍ×厚み３ｍｍの成型品を得た。
Comparative Example As SMC paste, 70 parts by mass of iso-type unsaturated polyester resin and 30 parts by mass of styrene-based low shrinkage agent, 180 parts by mass of aluminum hydroxide as a filler with respect to 100 parts by mass of resin, 0.04 parts by mass of stabilizer A compound containing 1.0 part by mass of the curing agent, 3.0 parts by mass of the toner, 3.0 parts by mass of the release agent, and 3.0 parts by mass of the thickener was prepared.
A glass chopped fiber obtained by cutting a glass fiber was used as the reinforcing fiber, and an SMC dispersed and impregnated in the above compound at a content of 20% by mass with respect to the SMC was produced. The mass ratio of the glass chopped fibers in SMC was 20% by mass.
The obtained SMC was cut into a size of 300 mm × 300 mm, and a laminate of 6 sheets was put into a plate forming mold and subjected to thermoforming at a temperature of 140 ° C., a pressing pressure of 80 t, and a pressing time of 240 seconds. A molded product of 300 mm × 300 mm × thickness 3 mm was obtained.
実施例
強化繊維として、晒し木綿からなるスパンレース不織布（ユニチカ株式会社製 商品名：コットエース（登録商標）Ｃ１５０Ｓ／Ａ０７ 目付１５０ｇ／ｍ２）を用意した。
ＳＭＣ用ペーストとして、比較例で用いたものを使用しようとしたところ、ペーストの粘度が高く不織布に含浸できなかったため、ペーストの粘度を調整するために、樹脂１００質量部に対して水酸化アルミを充填剤として６０質量部としたこと以外は、比較例と同様のペーストを準備して、不織布にＳＭＣペーストを含浸させて、ＳＭＣを得た。ＳＭＣ中における不織布の質量比は、２０質量％とした。
得られたＳＭＣを３００ｍｍ×３００ｍｍの大きさに裁断し、これを６枚積層したものを平板成形用金型に投入し、温度１４０℃、プレス圧８０ｔ、加圧時間２４０秒で、熱成型を施し、３００ｍｍ×３００ｍｍ×厚み３ｍｍの成型品を得た。
Example A spunlace nonwoven fabric (trade name: COT ACE (registered trademark) C150S / A07 basis weight 150 g / m 2 manufactured by Unitika Ltd.) made of bleached cotton was prepared as the reinforcing fiber.
When trying to use the paste used in the comparative example as the paste for SMC, the viscosity of the paste was high and the nonwoven fabric could not be impregnated. Therefore, in order to adjust the viscosity of the paste, aluminum hydroxide was added to 100 parts by mass of the resin. A paste similar to the comparative example was prepared except that the filler was 60 parts by mass, and the nonwoven fabric was impregnated with the SMC paste to obtain SMC. The mass ratio of the nonwoven fabric in SMC was 20 mass%.
The obtained SMC was cut into a size of 300 mm × 300 mm, and a laminate of 6 sheets was put into a flat plate mold and subjected to thermoforming at a temperature of 140 ° C., a press pressure of 80 t, and a pressurization time of 240 seconds. To give a molded product of 300 mm × 300 mm × thickness 3 mm.
得られた実施例および比較例の成形品について、打撃加振に対する音響性能測定を行い、その結果を表１に示す。なお、測定方法の詳細は上述したとおりである。 The obtained molded products of Examples and Comparative Examples were measured for acoustic performance against impact vibration, and the results are shown in Table 1. The details of the measurement method are as described above.
また、上記音圧レベルから算出されるラウドネス（単位はｓｏｎｅであり、音の大きさの指標。値が大きいほど大きく聞こえることを示す。）、シャープネス（単位はａｃｕｍであり、音の甲高さの指標。値が大きいほど高い周波数成分を含み甲高く聞こえることを示す。）についても、本発明の成型品は、ガラス繊維を強化繊維とする成形品よりも値が小さく、同じ打撃を与えた際に発する放射音がより小さく、かつ甲高い音ではないという結果であった。 Also, loudness calculated from the sound pressure level (the unit is sound, an indicator of the loudness of the sound. The larger the value, the louder the sound is heard), the sharpness (the unit is acum, the pitch of the sound) The higher the value is, the higher the frequency component is, and the higher the instep sound is.), The molded product of the present invention is smaller in value than the molded product with glass fiber as the reinforcing fiber, The result was that the radiated sound emitted from the sound was smaller and not high-pitched.
Claims (2)
該シートモールディングコンパウンドは、熱硬化性樹脂組成物が短繊維からなるシートに含浸してなるシートモールディングコンパウンドであって、
短繊維が主として木綿繊維であり、
シートが、構成繊維である短繊維同士が三次元的に交絡一体化してなる不織布であり、
シートモールディングコンパウンド中におけるシートの質量比が５〜２５質量％であることを特徴とするシートモールディングコンパウンド。 A sheet molding compound for obtaining a molded product that reduces noise in a high frequency range of 2500 Hz to 12500 Hz.
The sheet molding compound is I Oh sheet molding compounds thermosetting resin composition obtained by impregnating a sheet made of short fibers,
The short fibers are mainly cotton fibers,
The sheet is a nonwoven fabric in which short fibers that are constituent fibers are entangled and integrated three-dimensionally,
A sheet molding compound, wherein a mass ratio of the sheet in the sheet molding compound is 5 to 25% by mass.
Claim 1 of the sheet molding compound according to the state of the state or a plurality Again multilayer monolayer, formed type products for noise reduction in the treble region, characterized by comprising molding into a predetermined shape by pressing and heating.
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