JP2019214694A - Fiber-reinforced thermoplastic resin composition - Google Patents
Fiber-reinforced thermoplastic resin composition Download PDFInfo
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本発明は、繊維強化熱可塑性樹脂組成物に関し、特に繊維として炭素繊維及びガラス繊維を含む繊維強化熱可塑性樹脂組成物に関する。 The present invention relates to a fiber-reinforced thermoplastic resin composition, and more particularly to a fiber-reinforced thermoplastic resin composition containing carbon fibers and glass fibers as fibers.
成形材料として熱可塑性樹脂を利用する場合に、強度を高める方法として、従来から繊維を配合する方法が知られている。繊維としては、例えば、炭素繊維やガラス繊維を挙げることができる。 When a thermoplastic resin is used as a molding material, a method of blending fibers has been conventionally known as a method of increasing the strength. Examples of the fiber include a carbon fiber and a glass fiber.
本出願人は、特許文献１に示すように、炭素繊維強化樹脂からなる管状の芯材の外面に、その主成分樹脂がエチレン−アクリル酸共重合体である被覆樹脂層が設けられている樹脂被覆体を開示している。 As disclosed in Patent Document 1, the present applicant has disclosed a resin in which a coating resin layer whose main component resin is an ethylene-acrylic acid copolymer is provided on the outer surface of a tubular core material made of carbon fiber reinforced resin. A coating is disclosed.
ところで、炭素繊維を配合する場合は、比較的少量の配合でも強度を大きく高めることができるが、コストが高く、いわゆる、汎用製品の材料としては利用しにくいので、特許文献１に示すように、二層構造の一方の層のみに炭素繊維を配合するような、製品全体ではなく、その一部に利用することが多い。 By the way, when carbon fiber is compounded, the strength can be greatly increased even with a relatively small amount of compounding, but the cost is high and it is difficult to use it as a material for so-called general-purpose products. It is often used not for the whole product, but for a part of it, in which carbon fibers are compounded in only one layer of the two-layer structure.
一方、ガラス繊維は、熱硬化性樹脂に配合してＦＲＰに利用されたり、長尺のガラス繊維を熱可塑性樹脂で被覆した被覆材料として利用されたりしているが、炭素繊維に比べると強度の上昇の程度が小さく、強度を高めるためには大量に配合する必要があった。 On the other hand, glass fiber is used in FRP by being blended with thermosetting resin, or as a coating material in which long glass fiber is coated with a thermoplastic resin, but has a higher strength than carbon fiber. The degree of rise was small, and it was necessary to mix a large amount to increase the strength.
本発明者はかかる従来の問題点に鑑み鋭意研究の結果、熱可塑性樹脂に対して、炭素繊維とガラス繊維とを特定の割合で配合することによって、炭素繊維とガラス繊維とが相乗的に作用し、配合組成物の強度が著しく高まることを見いだし、本発明を完成するに至った。 The present inventors have conducted intensive studies in view of such conventional problems, and as a result of blending carbon fibers and glass fibers with a thermoplastic resin in a specific ratio, carbon fibers and glass fibers act synergistically. However, they have found that the strength of the blended composition is significantly increased, and have completed the present invention.
上記目的を達成するために、本発明は次のような構成としている。
すなわちこの発明に係る繊維強化熱可塑性樹脂組成物は、熱可塑性樹脂と、熱可塑性樹脂１００重量部に対して炭素繊維５〜２５重量部と、ガラス繊維２０〜７０重量部とを含み、かつ、炭素繊維とガラス繊維との総和が前記熱可塑性樹脂１００重量部に対して４０〜７５重量部であることを特徴とするものである。
In order to achieve the above object, the present invention has the following configuration.
That is, the fiber-reinforced thermoplastic resin composition according to the present invention contains a thermoplastic resin, 5 to 25 parts by weight of carbon fibers, and 20 to 70 parts by weight of glass fibers based on 100 parts by weight of the thermoplastic resin, and The total of carbon fiber and glass fiber is 40 to 75 parts by weight based on 100 parts by weight of the thermoplastic resin.
本発明において、前記熱可塑性樹脂と、熱可塑性樹脂１００重量部に対して前記炭素繊維８〜２０重量部と、前記ガラス繊維４８〜７０重量部とを含み、かつ、前記炭素繊維と前記ガラス繊維との総和が前記熱可塑性樹脂１００重量部に対して６５〜７５重量部であるようにすることが更に好ましい。 In the present invention, the thermoplastic resin contains 8 to 20 parts by weight of the carbon fiber and 48 to 70 parts by weight of the glass fiber with respect to 100 parts by weight of the thermoplastic resin, and the carbon fiber and the glass fiber Is more preferably 65 to 75 parts by weight with respect to 100 parts by weight of the thermoplastic resin.
本発明によれば、炭素繊維とガラス繊維とを特定の割合で配合することによって、炭素繊維とガラス繊維とが相乗的に作用し、炭素繊維とガラス繊維の配合割合から想定される曲げ強度よりも著しく高めることができる。 According to the present invention, by blending the carbon fiber and the glass fiber at a specific ratio, the carbon fiber and the glass fiber act synergistically, and the bending strength is estimated from the blending ratio of the carbon fiber and the glass fiber. Can also be significantly increased.
次に、本発明を実施するための最良の形態について、具体的に説明する。 Next, the best mode for carrying out the present invention will be specifically described.
本発明に係る繊維強化熱可塑性樹脂組成物は、熱可塑性樹脂と、炭素繊維とガラス繊維とを含むものである。 The fiber reinforced thermoplastic resin composition according to the present invention contains a thermoplastic resin, and carbon fibers and glass fibers.
熱可塑性合成樹脂としては、ポリプロピレン、ポリエチレン等のオレフィン系樹脂、ポリ塩化ビニル、ポリエチレンテレフタレート、ポリスチレン等が使用される。 As the thermoplastic synthetic resin, olefin resins such as polypropylene and polyethylene, polyvinyl chloride, polyethylene terephthalate, and polystyrene are used.
ガラス繊維としては、特に制限はないが、例えば、平均直径５〜２０μｍ、平均繊維長１００〜５００μｍのものを用いることができる。 Although there is no particular limitation on the glass fibers, for example, those having an average diameter of 5 to 20 μm and an average fiber length of 100 to 500 μm can be used.
炭素繊維としては、例えば、ポリアクリロニトリル（ＰＡＮ）系、レーヨン系、リグニン系、フェノール系、ピッチ系、気相成長系炭素繊維などが挙げられる。また、炭素繊維の形状も特に制限はないが、例えば、平均直径１〜１０μｍ、平均繊維長１００〜５００μｍのものを用いることができる。 Examples of the carbon fibers include polyacrylonitrile (PAN) -based, rayon-based, lignin-based, phenol-based, pitch-based, and vapor-grown carbon fibers. The shape of the carbon fiber is not particularly limited. For example, a carbon fiber having an average diameter of 1 to 10 μm and an average fiber length of 100 to 500 μm can be used.
次に本発明の実施形態について、実施例に基づいて説明する。 Next, embodiments of the present invention will be described based on examples.
〔実施例１〕
熱可塑性樹脂として、ポリエチレンテレフタレート樹脂（以下、「ＰＥＴ樹脂」）と、ＰＥＴ樹脂１００重量部に対して、炭素繊維７．７重量部、ガラス繊維４６．２重量部を含み、全繊維量５３．９重量部である混合物を作製した。具体的には、ＰＥＴ樹脂に炭素繊維のみ配合したペレット状配合物（株式会社中屋敷技研製、製品名：炭素繊維強化・改質ＰＥＴ樹脂）と、ＰＥＴ樹脂にガラス繊維のみ配合したペレット状配合物（ポリプラスチック株式会社製、製品名ＦＲ−ＰＥＴ（Ｒ）ＧＦ−ＰＥＴ）と、ＰＥＴ樹脂からなるペレット状配合物（株式会社中屋敷技研製、製品名：改質ＰＥＴ樹脂、品番ＰＥＴ−ＨＭＷ）とをそれぞれ作製し、前記の配合比率となるように、それぞれのペレット状配合物を混合した混合物を得た。配合割合を表１に示す。以下、各実施例の配合割合は表１，表３、各比較例の配合割合は表２，表４に示す。
[Example 1]
The thermoplastic resin contains polyethylene terephthalate resin (hereinafter, “PET resin”), 7.7 parts by weight of carbon fiber and 46.2 parts by weight of glass fiber with respect to 100 parts by weight of PET resin. A mixture of 9 parts by weight was prepared. More specifically, a pellet-like compound made by mixing only carbon fibers with PET resin (manufactured by Nakayashiki Giken Co., Ltd., product name: carbon fiber reinforced / modified PET resin) and a pellet-like compound made by mixing only glass fibers with PET resin Product (manufactured by Polyplastics Co., Ltd., product name: FR-PET (R) GF-PET) and a pellet-like compound made of PET resin (manufactured by Nakayashiki Giken Co., Ltd., product name: modified PET resin, product number: PET-HMW) ) Was prepared, and a mixture was obtained by mixing the respective pellet-like compounds so that the above-mentioned mixing ratio was obtained. The blending ratio is shown in Table 1. Hereinafter, the blending ratios of the respective examples are shown in Tables 1 and 3, and the blending ratios of the respective comparative examples are shown in Tables 2 and 4.
続いて、実施例１の混合物を原料とし、射出成形機を用いて、成形温度を２６０〜２８０℃に設定し、ＪＩＳ−Ｋ７１５２の熱可塑性プラスチック材料の射出成形試験片に基づく成形物を作製した。 Subsequently, using the mixture of Example 1 as a raw material, a molding temperature was set to 260 to 280 ° C. using an injection molding machine, and a molded product based on an injection molded test piece of a thermoplastic material of JIS-K7152 was produced. .
〔実施例２〕
実施例１において、ＰＥＴ樹脂１００重量部に対して、炭素繊維８．７重量部、ガラス繊維６５．２重量部、全繊維量７３．９重量部とした以外は同様にして、成形物を作製した。
[Example 2]
A molded article was produced in the same manner as in Example 1, except that 8.7 parts by weight of carbon fiber, 65.2 parts by weight of glass fiber, and 73.9 parts by weight of the total fiber were used with respect to 100 parts by weight of PET resin. did.
〔実施例３〕
実施例１において、ＰＥＴ樹脂１００重量部に対して、炭素繊維１６．７重量部、ガラス繊維５０重量部、全繊維量６６．７重量部とした以外は同様にして、成形物を作製した。
Example 3
A molded article was produced in the same manner as in Example 1, except that 16.7 parts by weight of carbon fiber, 50 parts by weight of glass fiber, and 66.7 parts by weight of total fiber were used with respect to 100 parts by weight of PET resin.
〔実施例４〕
実施例１において、ＰＥＴ樹脂１００重量部に対して、炭素繊維２１．７重量部、ガラス繊維２２．８重量部、全繊維量４４．５重量部とした以外は同様にして、成形物を作製した。
Example 4
A molded article was prepared in the same manner as in Example 1, except that 21.7 parts by weight of carbon fiber, 22.8 parts by weight of glass fiber, and 44.5 parts by weight of total fiber were used with respect to 100 parts by weight of PET resin. did.
〔実施例５〕
実施例１において、ＰＥＴ樹脂１００重量部に対して、炭素繊維２４重量部、ガラス繊維３６重量部、全繊維量６０重量部とした以外は同様にして、成形物を作製した。
Example 5
A molded article was produced in the same manner as in Example 1, except that the carbon fiber was 24 parts by weight, the glass fiber was 36 parts by weight, and the total fiber amount was 60 parts by weight based on 100 parts by weight of the PET resin.
〔比較例１〕
実施例１において、ＰＥＴ樹脂１００重量部に対して、炭素繊維５．３重量部とし、ガラス繊維を配合しなかった以外は同様にして成形物を作製した。
[Comparative Example 1]
A molded article was prepared in the same manner as in Example 1 except that 5.3 parts by weight of carbon fiber was used with respect to 100 parts by weight of PET resin, and no glass fiber was blended.
〔比較例２〕
実施例１において、ＰＥＴ樹脂１００重量部に対して、炭素繊維１１．１重量部とし、ガラス繊維を配合しなかった以外は同様にして成形物を作製した。
[Comparative Example 2]
A molded article was produced in the same manner as in Example 1, except that the carbon fiber was 11.1 parts by weight with respect to 100 parts by weight of the PET resin, and no glass fiber was blended.
〔比較例３〕
実施例１において、ＰＥＴ樹脂１００重量部に対して、炭素繊維１７．６重量部とし、ガラス繊維を配合しなかった以外は同様にして成形物を作製した。
[Comparative Example 3]
A molded article was produced in the same manner as in Example 1 except that 17.6 parts by weight of carbon fiber was used with respect to 100 parts by weight of PET resin, and no glass fiber was blended.
〔比較例４〕
実施例１において、ＰＥＴ樹脂１００重量部に対して、炭素繊維４２．９重量部とし、ガラス繊維を配合しなかった以外は同様にして成形物を作製した。
[Comparative Example 4]
A molded article was prepared in the same manner as in Example 1 except that 42.9 parts by weight of carbon fiber was used with respect to 100 parts by weight of PET resin, and no glass fiber was blended.
〔比較例５〕
実施例１において、ＰＥＴ樹脂１００重量部に対して、ガラス繊維１７．６重量部とし、炭素繊維を配合しなかった以外は同様にして成形物を作製した。
[Comparative Example 5]
A molded article was produced in the same manner as in Example 1 except that 17.6 parts by weight of glass fiber was used with respect to 100 parts by weight of PET resin, and no carbon fiber was blended.
〔比較例６〕
実施例１において、ＰＥＴ樹脂１００重量部に対して、ガラス繊維８１．８重量部とし、炭素繊維を配合しなかった以外は同様にして成形物を作製した。
[Comparative Example 6]
A molded article was prepared in the same manner as in Example 1, except that the glass fiber was 81.8 parts by weight with respect to 100 parts by weight of the PET resin, and that no carbon fiber was blended.
〔曲げ強度の測定〕
作製した成形物について、ＪＩＳ−Ｋ７１７１に基づく曲げ試験を実施した。各実施例及び各比較例の曲げ試験に基づく曲げ強度を表１及び表２の「実測値」の欄に示す。
[Measurement of bending strength]
The bending test based on JIS-K7171 was implemented about the produced molded object. The bending strength of each of the examples and comparative examples based on the bending test is shown in the column of “measured value” in Tables 1 and 2.
〔検量線の作製〕
比較例１〜比較例４の曲げ強度に基づき、炭素繊維の配合量（ｘ）に対する曲げ強度（ｙ）の変化を最小二乗法により一定の傾きを有する一次関数からなる近似式１（ｙ＝ａｘ＋ｂ）を求めた。その結果、ａ＝１．８９６、ｂ＝１３５．３となった。
[Preparation of calibration curve]
Based on the bending strengths of Comparative Examples 1 to 4, the change of the bending strength (y) with respect to the blending amount (x) of the carbon fiber was determined by the least squares method using an approximate expression 1 (y = ax + b) composed of a linear function having a constant slope. ). As a result, a = 1.896 and b = 135.3.
比較例５及び比較例６の曲げ強度に基づき、ガラス繊維の配合量（ｘ）に対する曲げ強度（ｙ）の変化を一定の傾きを有する一次関数からなる近似式２（ｙ＝ｃｘ＋ｄ）を求めた。その結果、ｃ＝０．５４５、ｄ＝１５３．４となった。 Based on the bending strengths of Comparative Example 5 and Comparative Example 6, the change of the bending strength (y) with respect to the blending amount (x) of the glass fiber was determined by an approximate expression 2 (y = cx + d) composed of a linear function having a constant slope. . As a result, c = 0.545 and d = 153.4.
〔曲げ強度の推定〕
前記二つの検量線を用いて、実施例１〜実施例５に対して炭素繊維のみを配合した時の曲げ強度に対して、ガラス繊維の配合により増加する曲げ強度を加算した値を想定値１として表１の「想定値１」の欄に表した。具体的には、近似式１において炭素繊維の配合量をｘに当てはめてｙ値を算出し、次にガラス繊維の配合量に近似式２のｃ値を乗じ、その和を想定値１とした。
[Estimation of bending strength]
Using the two calibration curves, a value obtained by adding the bending strength increased by the glass fiber blending to the bending strength when only the carbon fiber was blended in Examples 1 to 5 was assumed value 1. In the column of “estimated value 1” in Table 1. Specifically, in the approximate expression 1, the amount of the carbon fiber is applied to x to calculate the y value, and then the amount of the glass fiber is multiplied by the c value of the approximate expression 2, and the sum is set as the assumed value 1. .
前記二つの検量線を用いて、実施例１〜実施例５に対してガラス繊維のみを配合した時の曲げ強度に対して、炭素繊維の配合により増加する曲げ強度を加算した値を想定値２として表１の「想定値２」の欄に表した。具体的には、近似式２においてガラス繊維の配合量をｘに当てはめてｙ値を算出し、次に炭素繊維の配合量に近似式１のａ値を乗じ、その和を想定値２とした。 Using the two calibration curves, the value obtained by adding the bending strength increased by the blending of the carbon fiber to the bending strength when blending only the glass fiber in Examples 1 to 5 is assumed value 2 In the column of “assumed value 2” in Table 1. Specifically, in Formula 2, the y value is calculated by applying the amount of glass fiber to x, and then the value of a in Formula 1 is multiplied by the amount of carbon fiber, and the sum thereof is assumed value 2. .
前記想定値１、想定値２のうち大きい方を想定値３として、表１の「想定値３」の欄に表した。 The larger of the assumed value 1 and the assumed value 2 was set as the assumed value 3 and is shown in the column of “assumed value 3” in Table 1.
〔曲げ強度の強度比〕
実施例１〜実施例５の曲げ強度の実測値を、前記検量線を用いて算出した想定値３で除した値を表１の「強度比」の欄に表した。ここで、強度比の値が１よりも大きければ、炭素繊維とガラス繊維とを配合することによって相乗効果が生じて曲げ強度が上昇したものと考えられる。また、強度比が大きいほど、相乗効果が大きいと言える。
[Strength ratio of bending strength]
The value obtained by dividing the measured value of the bending strength in Examples 1 to 5 by the assumed value 3 calculated using the calibration curve is shown in the column of “strength ratio” in Table 1. Here, if the value of the strength ratio is larger than 1, it is considered that the blending of the carbon fiber and the glass fiber has caused a synergistic effect to increase the bending strength. Also, it can be said that the greater the intensity ratio, the greater the synergistic effect.
〔曲げ弾性率の測定〕
作製した成形物について、ＪＩＳ−Ｋ７１７１に基づく曲げ試験を実施した。各実施例及び各比較例の曲げ試験に基づく曲げ弾性率を表３及び表４の「実測値」の欄に示す。
(Measurement of flexural modulus)
The bending test based on JIS-K7171 was implemented about the produced molded object. The flexural modulus of each of the examples and comparative examples based on the bending test is shown in the column of “measured value” in Tables 3 and 4.
〔検量線の作製〕
比較例１〜比較例４の曲げ弾性率に基づき、炭素繊維の配合量（ｘ）に対する曲げ弾性率（ｙ）の変化を最小二乗法により一定の傾きを有する一次関数からなる近似式３（ｙ＝ａｘ＋ｂ）を求めた。その結果、ａ＝２６２．２、ｂ＝３４７４となった。
[Preparation of calibration curve]
Based on the bending elastic moduli of Comparative Examples 1 to 4, the change of the bending elastic modulus (y) with respect to the blending amount (x) of the carbon fiber was determined by the least squares method using an approximate expression 3 (y) composed of a linear function having a constant slope. = Ax + b). As a result, a = 262.2 and b = 3474.
比較例５及び比較例６の曲げ弾性率に基づき、ガラス繊維の配合量（ｘ）に対する曲げ弾性率（ｙ）の変化を一定の傾きを有する一次関数からなる近似式４（ｙ＝ｃｘ＋ｄ）を求めた。その結果、ｃ＝５４．７８、ｄ＝４８０２となった。 Based on the flexural modulus of Comparative Example 5 and Comparative Example 6, the change of the flexural modulus (y) with respect to the blending amount (x) of the glass fiber was calculated using an approximate expression 4 (y = cx + d) consisting of a linear function having a constant slope. I asked. As a result, c = 54.78 and d = 4802.
〔曲げ弾性率の推定〕
前記二つの検量線を用いて、実施例１〜実施例５に対して炭素繊維のみを配合した時の曲げ弾性率に対して、ガラス繊維の配合により増加する曲げ弾性率を加算した値を想定値１として表１の「想定値１」の欄に表した。具体的には、近似式１において炭素繊維の配合量をｘに当てはめてｙ値を算出し、次にガラス繊維の配合量に近似式２のｃ値を乗じ、その和を想定値４とした。
(Estimation of flexural modulus)
Using the two calibration curves, a value obtained by adding the flexural modulus increased by the blending of glass fiber to the flexural modulus when only carbon fiber is blended with respect to Examples 1 to 5 is assumed. The value 1 is shown in the column of “estimated value 1” in Table 1. More specifically, in the approximate formula 1, the y value is calculated by applying the blending amount of the carbon fiber to x, and then the blending amount of the glass fiber is multiplied by the c value of the approximate formula 2, and the sum is set to an assumed value 4. .
前記二つの検量線を用いて、実施例１〜実施例５に対してガラス繊維のみを配合した時の曲げ弾性率に対して、炭素繊維の配合により増加する曲げ弾性率を加算した値を想定値２として表１の「想定値２」の欄に表した。具体的には、近似式２においてガラス繊維の配合量をｘに当てはめてｙ値を算出し、次に炭素繊維の配合量に近似式１のａ値を乗じ、その和を想定値５とした。 Using the two calibration curves, a value obtained by adding the flexural modulus increased by the blending of carbon fiber to the flexural modulus when only glass fiber is blended with respect to Examples 1 to 5 is assumed. The value 2 is shown in the column of “expected value 2” in Table 1. Specifically, in the approximate expression 2, the y value is calculated by applying the blending amount of the glass fiber to x, and then the blending amount of the carbon fiber is multiplied by the value a of the approximate expression 1, and the sum is set to an assumed value 5. .
前記想定値４、想定値５のうち大きい方を想定値６として、表３の「想定値６」の欄に表した。 The larger of the assumed value 4 and the assumed value 5 was set as the assumed value 6 and is shown in the column of “assumed value 6” in Table 3.
〔曲げ弾性率の弾性率比〕
実施例１〜実施例５の曲げ弾性率の実測値を、前記検量線を用いて算出した想定値６で除した値を弾性率比として表１の「弾性率比」の欄に表した。ここで、弾性率比の値が１よりも大きければ、炭素繊維とガラス繊維とを配合することによって相乗効果が生じて曲げ弾性率が上昇したものと考えられる。また、弾性率比が大きいほど、相乗効果が大きいと言える。
(Elastic modulus ratio of bending elastic modulus)
The value obtained by dividing the actually measured value of the bending elastic modulus in Examples 1 to 5 by the assumed value 6 calculated using the calibration curve was shown as the elastic modulus ratio in the column of “Elastic modulus ratio” in Table 1. Here, when the value of the elastic modulus ratio is larger than 1, it is considered that the blending of the carbon fiber and the glass fiber produces a synergistic effect to increase the bending elastic modulus. Also, it can be said that the greater the elastic modulus ratio, the greater the synergistic effect.
〔曲げ強度の評価〕
表１の「強度比」の欄に記載の通り、実施例１〜実施例５はいずれも１を超えた数値となっており、炭素繊維とガラス繊維とを配合することによって相乗効果が生じて曲げ強度が上昇したものと考えられる。理由は定かではないが、特に実施例２、実施例３においては想定値３よりも２割上昇しており、ＰＥＴ樹脂と、ＰＥＴ樹脂１００重量部に対して炭素繊維８〜２０重量部、ガラス繊維４８〜７０重量部を含み、かつ、炭素繊維とガラス繊維との総和が６５〜７５重量部となる組成物とすることによって、炭素繊維とガラス繊維との相乗効果により曲げ強度が顕著に上昇するものと考えられる。
[Evaluation of bending strength]
As described in the column of “strength ratio” in Table 1, all of Examples 1 to 5 have numerical values exceeding 1, and a synergistic effect is produced by blending carbon fiber and glass fiber. It is considered that the bending strength increased. Although the reason is not clear, in particular, in Examples 2 and 3, it is 20% higher than the assumed value 3, and 8 to 20 parts by weight of carbon fiber and 100 parts by weight of PET resin, By using a composition containing 48 to 70 parts by weight of fiber and having a total of 65 to 75 parts by weight of carbon fiber and glass fiber, the bending strength is remarkably increased due to a synergistic effect of carbon fiber and glass fiber. It is thought to be.
〔曲げ弾性率の評価〕
表３の「弾性率比」の欄に記載の通り、実施例１〜実施例５はいずれも１を超えた数値となっており、炭素繊維とガラス繊維とを配合することによって相乗効果が生じて曲げ弾性率が上昇したものと考えられる。理由は定かではないが、特に実施例２〜実施例４においては想定値３よりも２割上昇していた。
(Evaluation of flexural modulus)
As described in the column of "elastic modulus ratio" in Table 3, all of Examples 1 to 5 have numerical values exceeding 1, and a synergistic effect is produced by blending carbon fiber and glass fiber. It is considered that the flexural modulus increased. Although the reason is not clear, particularly in Examples 2 to 4, the value was increased by 20% from the assumed value 3.
〔曲げ強度と曲げ弾性率との評価〕
曲げ強度の「強度比」及び曲げ弾性率の「弾性率比」は、実施例１〜実施例５においては、同様な傾向であって、特に、実施例２、実施例３において、曲げ強度及び曲げ弾性率に対して、炭素繊維とガラス繊維とを特定の割合で配合することによる相乗効果が顕著に現れており、ＰＥＴ樹脂と、ＰＥＴ樹脂１００重量部に対して炭素繊維８〜２０重量部、ガラス繊維４８〜７０重量部を含み、かつ、炭素繊維とガラス繊維との総和がＰＥＴ樹脂１００重量部に対して６５〜７５重量部となる組成物とすることによって、炭素繊維とガラス繊維との相乗効果により曲げ強度及び曲げ弾性率が顕著に上昇するものと考えられる。
[Evaluation of flexural strength and flexural modulus]
The “strength ratio” of the bending strength and the “elastic modulus ratio” of the flexural modulus have the same tendency in Examples 1 to 5, and particularly, in Examples 2 and 3, the bending strength and The synergistic effect of blending the carbon fiber and the glass fiber at a specific ratio with respect to the flexural modulus is remarkably exhibited, and the carbon fiber is 8 to 20 parts by weight based on 100 parts by weight of the PET resin and the PET resin. By including 48 to 70 parts by weight of glass fiber, and a composition in which the total of carbon fiber and glass fiber is 65 to 75 parts by weight with respect to 100 parts by weight of PET resin, carbon fiber and glass fiber It is thought that the bending strength and the flexural modulus are significantly increased due to the synergistic effect of.
本発明は、パイプ部材のＴ字状、Ｌ字状に連結するための連結部材等、軽量で、かつ、曲げ強度を必要とする部材として広く利用することができる。
INDUSTRIAL APPLICABILITY The present invention can be widely used as a member that is lightweight and requires bending strength, such as a connecting member for connecting a pipe member in a T-shape or an L-shape.
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