WO2012165286A1 - Fiber-reinforced plastic - Google Patents

Fiber-reinforced plastic Download PDF

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Publication number
WO2012165286A1
WO2012165286A1 PCT/JP2012/063298 JP2012063298W WO2012165286A1 WO 2012165286 A1 WO2012165286 A1 WO 2012165286A1 JP 2012063298 W JP2012063298 W JP 2012063298W WO 2012165286 A1 WO2012165286 A1 WO 2012165286A1
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Prior art keywords
fiber
plant
reinforced plastic
fibers
thermoplastic resin
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PCT/JP2012/063298
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French (fr)
Japanese (ja)
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三浦　寿久
修久 奥田
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トヨタ車体株式会社
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Publication of WO2012165286A1 publication Critical patent/WO2012165286A1/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/045—Reinforcing macromolecular compounds with loose or coherent fibrous material with vegetable or animal fibrous material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/14—Copolymers of propene
    • C08L23/142—Copolymers of propene at least partially crystalline copolymers of propene with other olefins
    • 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
    • C08J2300/00—Characterised by the use of unspecified polymers
    • C08J2300/16—Biodegradable polymers
    • 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
    • C08J2300/00—Characterised by the use of unspecified polymers
    • C08J2300/22—Thermoplastic resins
    • 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
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • 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
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene
    • 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
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils

Definitions

  • the present invention relates to a fiber reinforced plastic in which a vegetable fiber is blended as a reinforcing fiber in a thermoplastic resin.
  • fiber reinforced plastics in which inorganic fibers such as glass fibers and carbon fibers are blended have been developed as reinforcing fibers for improving mechanical strength in thermoplastic resins.
  • fiber-reinforced plastics containing inorganic fibers have a problem that residues derived from inorganic fibers remain even if they are incinerated. Therefore, fiber reinforced plastics in which plant fibers are blended as reinforcing fibers instead of inorganic fibers have been developed.
  • Such a fiber reinforced plastic is disclosed in, for example, Japanese Patent Application Laid-Open No. 2006-347079.
  • lignocellulose fibers obtained from plants are treated with a long-chain dihydric alcohol having a plurality of ether bonds, or treated with paraffin wax in order to reduce the unique fermentation odor generated in the process of taking out plant fibers. Or treated with isocyanate.
  • the reason why the strength of fiber reinforced plastic using plant fiber is relatively low is that the strength of the plant fiber itself is low as described above, and the interface strength between the plant fiber and the thermoplastic resin is low. Also mentioned. This is because if the interfacial strength between the plant fiber and the thermoplastic resin is low, the adhesive force between the plant fiber and the thermoplastic resin is lowered, and therefore, the interface peels off against the external force, and the breakage occurs therefrom. Therefore, in order to improve the mechanical strength of the fiber reinforced plastic, it is important to improve the interfacial strength between the plant fiber and the thermoplastic resin.
  • a fiber reinforced plastic containing a thermoplastic resin and plant fibers, wherein the plant fiber content (% by weight) / average fiber diameter ( ⁇ m) is 1.2 or more.
  • the interface area between the plant fiber and the thermoplastic resin is 480 cm 2 / cm 3 or more.
  • the interface area between the plant fiber and the thermoplastic resin can be increased to 480 cm 2 / cm 3 or more.
  • the interfacial strength between the vegetable fiber and the thermoplastic resin is improved, and thus the mechanical strength of the fiber reinforced plastic can be improved to a practical level.
  • the balance between the plant fiber content and the average fiber diameter is appropriately designed to increase the interfacial area between the plant fiber and the thermoplastic resin.
  • the interface strength increases.
  • a fiber reinforced plastic having good mechanical strength can be obtained while using environment-friendly plant fibers.
  • FRP fiber reinforced plastic
  • thermoplastic resin examples include polyolefin resins such as polypropylene and polyethylene, polycarbonate resins, polyethylene terephthalate, polybutylene terephthalate, polyester resins such as poly (ethylene-2,6-naphthalate), propylene-ethylene copolymers, polystyrene resins, Copolymers of aromatic vinyl monomers and (meth) acrylic acid alkyl esters having lower alkyl groups, terephthalic acid-ethylene glycol-cyclohexanedimethanol copolymers, (meth) acrylic resins such as polymethyl methacrylate, etc.
  • polyolefin resins such as polypropylene and polyethylene
  • polycarbonate resins such as polyethylene terephthalate, polybutylene terephthalate
  • polyester resins such as poly (ethylene-2,6-naphthalate), propylene-ethylene copolymers, polystyrene resins, Copolymers of aromatic vinyl monomers and (meth) acrylic acid alkyl
  • biodegradable resins such as polylactic acid, polybutylene succinate, polycaprolactone, and polyhydroxybutyrate, and plant-derived resins can be used.
  • thermoplastic resins may be used alone or in combination of two or more.
  • polypropylene, polyethylene, polycarbonate, and polyethylene terephthalate are preferable in terms of moldability and material cost.
  • a biodegradable resin or a plant-derived resin is advantageous for reducing the environmental burden.
  • Plant fibers are not particularly limited, and fibers obtained from herbs and woods can be used.
  • Herbs include pineapples such as Kurrawa and pineapple, as well as kenaf, ramie (flax), linen (flax), abaca (manila hemp), heneken (sisal hemp), jute (cannabis), hemp (cannabis) , Bast plants such as palm, palm, mulberry, straw and bagasse.
  • coniferous trees such as cedar and cypress, broad-leaved trees such as shii, oak and cherry, and tropical trees can be used. If it is a bast plant, it is easy to obtain good quality fibers.
  • Plant fibers include mechanical pulps, chemical pulps, semi-chemical pulps, and various types of artificial cellulose fibers synthesized from these pulps as raw materials. Treatment for obtaining such pulp fibers and cellulose fibers. Is not preferable because it is complicated. These plant fibers may be used alone or in combination of two or more.
  • the content of the plant fiber in the fiber reinforced plastic is not particularly limited, and may be the same as that of the conventional fiber reinforced plastic. Specifically, it may be about 3 to 50% by weight, preferably about 5 to 45% by weight, more preferably about 10 to 40% by weight. This is because if the content of the plant fiber is too small, it is difficult to obtain a reinforcing effect, and if it is too much, the strength tends to decrease and the strength tends to decrease. In addition, it is also preferable to surface-treat plant fiber with a silane coupling agent etc. as needed. This is because the bonding strength between the thermoplastic resin and the plant fiber can be improved.
  • the plant fiber content itself is not so important, but the balance with the fiber diameter is important.
  • the plant fiber content (% by weight) / average fiber diameter ( ⁇ m) is at least 1.2 or more.
  • the total interfacial area between the vegetable fiber and the thermoplastic resin becomes at least 480 cm 2 / cm 3 or more, and the total interfacial area between the plant fiber and the thermoplastic resin can be made larger than that of the conventional fiber reinforced plastic.
  • the overall interface strength between the plant fiber and the thermoplastic resin is improved, and the mechanical strength of the fiber-reinforced plastic can be improved.
  • the average fiber diameter of the plant fiber is as small as possible.
  • the average fiber diameter of the plant fiber is 35 ⁇ m or less, preferably 30 ⁇ m or less, more preferably 25 ⁇ m or less, and still more preferably 20 ⁇ m or less.
  • the fiber diameter of the plant fiber may be the fiber diameter as it is obtained from the plant, or may be appropriately adjusted by defibrating. However, since it takes time and labor to unravel the fiber, it is preferable to use the fiber obtained from the plant as it is. Some plants can be obtained in the form of single fibers and others can be obtained in the form of fiber bundles. Therefore, when referring to the fiber diameter of the plant fiber, the fiber diameter in the state of a single fiber and the fiber diameter in the state of a fiber bundle are included. There is a limit to the fineness of plant fibers. Therefore, the lower limit of the average fiber diameter of the plant fiber is not limited to good. For example, Kurawa fiber and pineapple fiber, which are the smallest fiber diameters, have a fiber diameter of about 7 ⁇ m.
  • the fiber length of the plant fiber is not particularly limited, but the longer the fiber length, the better the mechanical strength. However, if the fiber length of the plant fiber is too long, the moldability of the molded body made of fiber-reinforced plastic may be lowered, for example, the fluidity is lowered when kneaded with the thermoplastic resin. Considering this, the fiber length of the plant fiber is preferably about 0.1 to 30 mm, more preferably about 0.5 to 10 mm. In addition, in order to adjust the fiber length of each fiber, it can also be set as a chopped fiber as needed. Chopped fiber is obtained by bundling continuous fibers and cutting them into predetermined dimensions.
  • additives can be added to the fiber reinforced plastic as long as the effects of the present invention are not impaired. Specifically, pigments, dyes, dispersants, stabilizers, plasticizers, modifiers, UV absorbers, light stabilizers, antioxidants, antistatic agents, lubricants, mold release agents, etc. may be added. it can.
  • the fiber reinforced plastic is formed as a resin molded body having a predetermined shape by kneading the thermoplastic resin and the vegetable fiber and then extruding or injection molding.
  • the obtained resin molded product can be suitably used as an interior material for automobile door trims, inner panels, pillar garnishes, rear packages, interior light lenses, and the like. In addition, it can also be used as building materials, civil engineering materials, packaging materials, daily necessities.
  • Table 1 shows the thermoplastic resins and plant fibers used in each Example and Comparative Example, and their compositions.
  • the content ratio / average fiber diameter is 1.2 or more
  • the total interfacial area between the thermoplastic resin and the plant fiber is 480 cm 2 / cm 3 or more, and a good strength that can be handled even at a practical level is obtained.
  • the Kurrawa fiber and the pineapple fiber have a particularly small fiber diameter among plant fibers, so that the content ratio / average fiber diameter is 4.0 or more and the total interface area between the thermoplastic resin and the plant fibers is 1700 cm 2 / cm 3 or more. It was confirmed that high strength was obtained.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Reinforced Plastic Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

A fiber-reinforced plastic, which contains a thermoplastic resin and vegetable fibers, and wherein the ratio of the vegetable fiber content (wt%) to the average fiber diameter (μm) is 1.2 or more and the area of the interfaces between the vegetable fibers and the thermoplastic resin is 480 cm2/cm3 or more.

Description

繊維強化プラスチックFiber reinforced plastic
　本発明は、熱可塑性樹脂に、補強繊維として植物繊維を配合した繊維強化プラスチックに関する。 The present invention relates to a fiber reinforced plastic in which a vegetable fiber is blended as a reinforcing fiber in a thermoplastic resin.
　従来から、熱可塑性樹脂に機械的強度を向上するための補強繊維として、ガラス繊維や炭素繊維等の無機繊維を配合した繊維強化プラスチック（ＦＲＰ）が開発されている。しかし、無機繊維を配合した繊維強化プラスチックは、これを焼却しても無機繊維に由来する残渣が残るという問題を有する。そこで、無機繊維に替えて、補強繊維として植物繊維を配合した繊維強化プラスチックが開発されている。このような繊維強化プラスチックとしては、例えば特開２００６－３４７０７９号公報に開示されている。 Conventionally, fiber reinforced plastics (FRP) in which inorganic fibers such as glass fibers and carbon fibers are blended have been developed as reinforcing fibers for improving mechanical strength in thermoplastic resins. However, fiber-reinforced plastics containing inorganic fibers have a problem that residues derived from inorganic fibers remain even if they are incinerated. Therefore, fiber reinforced plastics in which plant fibers are blended as reinforcing fibers instead of inorganic fibers have been developed. Such a fiber reinforced plastic is disclosed in, for example, Japanese Patent Application Laid-Open No. 2006-347079.
　同公報では、植物繊維を取り出す過程で生じる独特の発酵匂を低減させるため、植物から得られるリグノセルロース繊維をエーテル結合を複数有する長鎖の二価のアルコールにより処理したり、パラフィンワックスにより処理したり、イソシアネートにより処理したりしている。 In this publication, lignocellulose fibers obtained from plants are treated with a long-chain dihydric alcohol having a plurality of ether bonds, or treated with paraffin wax in order to reduce the unique fermentation odor generated in the process of taking out plant fibers. Or treated with isocyanate.
　上記公報では、植物繊維に起因する臭気を改善するものであるが、繊維強化プラスチックの本来的機能である強度の向上については特に着目していない。すなわち、植物繊維は環境負荷が小さいというメリットを有するものの、従来のガラス繊維や炭素繊維と比べると絶対的な強度が劣るため、繊維強化プラスチックの強度も無機繊維を配合する場合と比べると相対的に低くなってしまう。そのため、植物繊維を用いた高強度繊維強化プラスチックの開発が実用化に対する重要な課題となっている。 In the above publication, although the odor caused by the plant fiber is improved, no particular attention is paid to the improvement in strength, which is an essential function of the fiber reinforced plastic. That is, although plant fiber has the merit that environmental load is small, since absolute strength is inferior compared with conventional glass fiber and carbon fiber, the strength of fiber reinforced plastic is also relative to the case of blending inorganic fiber. It will be low. Therefore, the development of high-strength fiber reinforced plastic using plant fibers has become an important issue for practical use.
　また、植物繊維を用いた繊維強化プラスチックの強度が相対的に低くなる原因としては、上記のように植物繊維自体の強度が低いことに加え、植物繊維と熱可塑性樹脂との界面強度が低いことも挙げられる。植物繊維と熱可塑性樹脂との界面強度が低いと、植物繊維と熱可塑性樹脂との接着力が低くなるため、外力に対して界面剥離が生じ、そこから破壊が生じるからである。したがって、繊維強化プラスチックの機械的強度を向上するには、植物繊維と熱可塑性樹脂との界面強度を向上させることが重要である。 In addition, the reason why the strength of fiber reinforced plastic using plant fiber is relatively low is that the strength of the plant fiber itself is low as described above, and the interface strength between the plant fiber and the thermoplastic resin is low. Also mentioned. This is because if the interfacial strength between the plant fiber and the thermoplastic resin is low, the adhesive force between the plant fiber and the thermoplastic resin is lowered, and therefore, the interface peels off against the external force, and the breakage occurs therefrom. Therefore, in order to improve the mechanical strength of the fiber reinforced plastic, it is important to improve the interfacial strength between the plant fiber and the thermoplastic resin.
　本発明の一つの特徴によると、熱可塑性樹脂と、植物繊維とを含む繊維強化プラスチックであって、前記植物繊維の含有率（重量％）／平均繊維径（μｍ）が１．２以上であり、前記植物繊維と前記熱可塑性樹脂との界面積が４８０ｃｍ２／ｃｍ３以上であることを特徴とする。 According to one aspect of the present invention, there is provided a fiber reinforced plastic containing a thermoplastic resin and plant fibers, wherein the plant fiber content (% by weight) / average fiber diameter (μm) is 1.2 or more. The interface area between the plant fiber and the thermoplastic resin is 480 cm 2 / cm 3 or more.
　これによれば、植物繊維の含有率と平均繊維径とのバランスを適切に設計することで、植物繊維と熱可塑性樹脂との界面積を４８０ｃｍ２／ｃｍ３以上に大きくできる。これにより、植物繊維と熱可塑性樹脂との界面強度が向上し、以って繊維強化プラスチックの機械的強度も実用レベルにまで向上することができる。 According to this, by appropriately designing the balance between the plant fiber content and the average fiber diameter, the interface area between the plant fiber and the thermoplastic resin can be increased to 480 cm 2 / cm 3 or more. Thereby, the interfacial strength between the vegetable fiber and the thermoplastic resin is improved, and thus the mechanical strength of the fiber reinforced plastic can be improved to a practical level.
　本発明によれば、植物繊維の含有率と平均繊維径とのバランスを適切に設計して植物繊維と熱可塑性樹脂との界面積を大きくすることで、植物繊維と熱可塑性樹脂との全体的な界面強度が大きくなる。而して、環境に優しい植物繊維を使用しながら、良好な機械的強度を有する繊維強化プラスチックを得ることができる。 According to the present invention, the balance between the plant fiber content and the average fiber diameter is appropriately designed to increase the interfacial area between the plant fiber and the thermoplastic resin. The interface strength increases. Thus, a fiber reinforced plastic having good mechanical strength can be obtained while using environment-friendly plant fibers.
　以下に、本発明の実施の形態について詳しく説明する。本発明の繊維強化プラスチック（ＦＲＰ）は、ベースとなる熱可塑性樹脂に、補強繊維として植物繊維が配合されている。 Hereinafter, embodiments of the present invention will be described in detail. In the fiber reinforced plastic (FRP) of the present invention, vegetable fiber is blended as a reinforcing fiber in a thermoplastic resin as a base.
　熱可塑性樹脂としては、例えばポリプロピレンやポリエチレン等のポリオレフィン樹脂、ポリカーボネート樹脂、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリ（エチレン－２，６－ナフタレート）等のポリエステル樹脂、プロピレン－エチレン共重合体、ポリスチレン樹脂、芳香族ビニル系単量体と低級アルキル基を有する（メタ）アクリル酸アルキルエステルとの共重合体、テレフタル酸－エチレングリコール－シクロヘキサンジメタノール共重合体、ポリメチルメタクリレート等の（メタ）アクリル樹脂などの合成樹脂のほか、ポリ乳酸、ポリブチレンサクシネート、ポリカプロラクトン、ポリヒドロキシブチレートなどの生分解性樹脂や植物由来樹脂を挙げることができる。これらの熱可塑性樹脂は、１種のみを単独で使用してもよく、２種以上を混合使用してもよい。中でも、成形性や材料費等の点から、ポリプロピレン、ポリエチレン、ポリカーボネート、ポリエチレンテレフタレートが好ましい。生分解性樹脂や植物由来樹脂であれば、環境負荷の低減に有利である。 Examples of the thermoplastic resin include polyolefin resins such as polypropylene and polyethylene, polycarbonate resins, polyethylene terephthalate, polybutylene terephthalate, polyester resins such as poly (ethylene-2,6-naphthalate), propylene-ethylene copolymers, polystyrene resins, Copolymers of aromatic vinyl monomers and (meth) acrylic acid alkyl esters having lower alkyl groups, terephthalic acid-ethylene glycol-cyclohexanedimethanol copolymers, (meth) acrylic resins such as polymethyl methacrylate, etc. In addition to these synthetic resins, biodegradable resins such as polylactic acid, polybutylene succinate, polycaprolactone, and polyhydroxybutyrate, and plant-derived resins can be used. These thermoplastic resins may be used alone or in combination of two or more. Of these, polypropylene, polyethylene, polycarbonate, and polyethylene terephthalate are preferable in terms of moldability and material cost. A biodegradable resin or a plant-derived resin is advantageous for reducing the environmental burden.
　植物繊維としては特に限定されず、草本類や木本類から得られる繊維を使用可能である。草本類としては、クラワ、パイナップルなどのパイナップル科の植物のほか、例えばケナフ、ラミー（苧麻）、リネン（亜麻）、アバカ（マニラ麻）、ヘネケン（サイザル麻）、ジュート（黄麻）、ヘンプ（大麻）、ヤシ、パーム、コウゾ、ワラ、バガスなどの靭皮植物が挙げられる。木本類としては、スギやヒノキなどの針葉樹や、シイ、柿、サクラなどの広葉樹、熱帯樹を使用することができる。靭皮植物であれば、良質な繊維が得られやすい。一方、クラワやパイナップルであれば、植物繊維の中でも最も繊維径が小さいうちの１つであるというメリットを有する。なお、植物繊維としては、機械パルプ、化学パルプ、セミケミカルパルプ、これらのパルプを原料として合成される人工の各種セルロース系繊維も含まれるが、このようなパルプ繊維やセルロース繊維は得るための処理が煩雑なので、好ましくない。これら植物繊維は、１種のみを単独で使用してもよく、２種以上を混合使用してもよい。 Plant fibers are not particularly limited, and fibers obtained from herbs and woods can be used. Herbs include pineapples such as Kurrawa and pineapple, as well as kenaf, ramie (flax), linen (flax), abaca (manila hemp), heneken (sisal hemp), jute (cannabis), hemp (cannabis) , Bast plants such as palm, palm, mulberry, straw and bagasse. As the woody species, coniferous trees such as cedar and cypress, broad-leaved trees such as shii, oak and cherry, and tropical trees can be used. If it is a bast plant, it is easy to obtain good quality fibers. On the other hand, if it is a Kurrawa or a pineapple, it has the merit that it is one of the smallest fiber diameters among plant fibers. Plant fibers include mechanical pulps, chemical pulps, semi-chemical pulps, and various types of artificial cellulose fibers synthesized from these pulps as raw materials. Treatment for obtaining such pulp fibers and cellulose fibers. Is not preferable because it is complicated. These plant fibers may be used alone or in combination of two or more.
　繊維強化プラスチック中における植物繊維の含有率は、従来からある繊維強化プラスチックと同程度でよく、特に限定されない。具体的には、３～５０重量％程度、好ましくは５～４５重量％程度、より好ましくは１０～４０重量％程度とすればよい。植物繊維の含有率が少なすぎると補強効果が得られ難く、多すぎても反って強度が低下する傾向にあるからである。なお、植物繊維は、必要に応じてシランカップリング剤等によって表面処理することも好ましい。これにより、熱可塑性樹脂と植物繊維との接合力を向上できるからである。 The content of the plant fiber in the fiber reinforced plastic is not particularly limited, and may be the same as that of the conventional fiber reinforced plastic. Specifically, it may be about 3 to 50% by weight, preferably about 5 to 45% by weight, more preferably about 10 to 40% by weight. This is because if the content of the plant fiber is too small, it is difficult to obtain a reinforcing effect, and if it is too much, the strength tends to decrease and the strength tends to decrease. In addition, it is also preferable to surface-treat plant fiber with a silane coupling agent etc. as needed. This is because the bonding strength between the thermoplastic resin and the plant fiber can be improved.
　上記のように、植物繊維の含有率そのものはさほど重要ではないが、繊維径とのバランスが重要である。具体的には、植物繊維の含有率（重量％）／平均繊維径（μｍ）を少なくとも１．２以上とする。これにより、植物繊維と熱可塑性樹脂との総界面積が少なくとも４８０ｃｍ２／ｃｍ３以上となり、従来からある繊維強化プラスチックよりも植物繊維と熱可塑性樹脂との総界面積を大きくできる。延いては、植物繊維と熱可塑性樹脂との全体的な界面強度が向上して、繊維強化プラスチックの機械的強度を向上することができる。 As described above, the plant fiber content itself is not so important, but the balance with the fiber diameter is important. Specifically, the plant fiber content (% by weight) / average fiber diameter (μm) is at least 1.2 or more. Thereby, the total interfacial area between the vegetable fiber and the thermoplastic resin becomes at least 480 cm 2 / cm 3 or more, and the total interfacial area between the plant fiber and the thermoplastic resin can be made larger than that of the conventional fiber reinforced plastic. As a result, the overall interface strength between the plant fiber and the thermoplastic resin is improved, and the mechanical strength of the fiber-reinforced plastic can be improved.
　そのためには、植物繊維の平均繊維径はできるだけ小さいことが好ましい。具体的には、植物繊維の平均繊維径を３５μｍ以下、好ましくは３０μｍ以下、より好ましくは２５μｍ以下、さらに好ましくは２０μｍ以下とする。植物繊維の平均繊維径をできるだけ小さくすることで、植物繊維の含有率／平均繊維径が大きくなり、植物繊維と熱可塑性樹脂との総界面積をより大きくできる。 For that purpose, it is preferable that the average fiber diameter of the plant fiber is as small as possible. Specifically, the average fiber diameter of the plant fiber is 35 μm or less, preferably 30 μm or less, more preferably 25 μm or less, and still more preferably 20 μm or less. By making the average fiber diameter of the plant fibers as small as possible, the plant fiber content / average fiber diameter is increased, and the total interfacial area between the plant fibers and the thermoplastic resin can be increased.
　植物繊維の繊維径は、植物から繊維を得た状態のままでの繊維径でもよいし、解繊することで適宜調整することもできる。但し、繊維を解繊するには手間を要するので、植物から得られた状態の繊維をそのまま使用することが好ましい。なお、植物によっては、繊維を単繊維の状態で得られるものと、繊維束の状態で得られるものがある。したがって、植物繊維の繊維径を言う場合は、単繊維の状態での繊維径と繊維束の状態での繊維径とを含む。なお、植物繊維の細さには限界がある。したがって、植物繊維の平均繊維径の下限は得に限定されない。例えば、最も繊維径の小さい部類であるクラワ繊維やパイナップル繊維でも、７μｍ程度の繊維径を有する。 The fiber diameter of the plant fiber may be the fiber diameter as it is obtained from the plant, or may be appropriately adjusted by defibrating. However, since it takes time and labor to unravel the fiber, it is preferable to use the fiber obtained from the plant as it is. Some plants can be obtained in the form of single fibers and others can be obtained in the form of fiber bundles. Therefore, when referring to the fiber diameter of the plant fiber, the fiber diameter in the state of a single fiber and the fiber diameter in the state of a fiber bundle are included. There is a limit to the fineness of plant fibers. Therefore, the lower limit of the average fiber diameter of the plant fiber is not limited to good. For example, Kurawa fiber and pineapple fiber, which are the smallest fiber diameters, have a fiber diameter of about 7 μm.
　植物繊維の繊維長も特に限定されないが、長いほど機械的強度の向上には有利である。しかし、植物繊維の繊維長が長すぎると、熱可塑性樹脂との混練時に流動性が低下するなど、繊維強化プラスチックからなる成形体の成形性が低下するおそれがある。これを踏まえると、植物繊維の繊維長は、０．１～３０ｍｍ程度が好ましく、より好ましくは０．５～１０ｍｍ程度である。なお、各繊維の繊維長を調整するため、必要に応じてチョップド繊維とすることもできる。チョップド繊維とは、連続繊維を束ねて所定の寸法にカットしたものである。 The fiber length of the plant fiber is not particularly limited, but the longer the fiber length, the better the mechanical strength. However, if the fiber length of the plant fiber is too long, the moldability of the molded body made of fiber-reinforced plastic may be lowered, for example, the fluidity is lowered when kneaded with the thermoplastic resin. Considering this, the fiber length of the plant fiber is preferably about 0.1 to 30 mm, more preferably about 0.5 to 10 mm. In addition, in order to adjust the fiber length of each fiber, it can also be set as a chopped fiber as needed. Chopped fiber is obtained by bundling continuous fibers and cutting them into predetermined dimensions.
　繊維強化プラスチック中には、本発明の効果を阻害しない範囲で、各種添加剤を添加することもできる。具体的には、顔料、染料、分散剤、安定剤、可塑剤、改質剤、紫外線吸収剤、光安定剤、酸化防止剤、帯電防止剤、潤滑剤、離型剤などを添加することもできる。 Various additives can be added to the fiber reinforced plastic as long as the effects of the present invention are not impaired. Specifically, pigments, dyes, dispersants, stabilizers, plasticizers, modifiers, UV absorbers, light stabilizers, antioxidants, antistatic agents, lubricants, mold release agents, etc. may be added. it can.
　繊維強化プラスチックは、上記熱可塑性樹脂と植物繊維とを混練したうえで、押出し成形や射出成形などによって所定形状の樹脂成形体として成形される。得られた樹脂成形体は、自動車のドアトリム、インナーパネル、ピラーガーニッシュ、リヤパッケージ、室内灯レンズなどの内装材として好適に使用できる。その他にも、建築材、土木材、包装材、日用品などとしても使用できる。 The fiber reinforced plastic is formed as a resin molded body having a predetermined shape by kneading the thermoplastic resin and the vegetable fiber and then extruding or injection molding. The obtained resin molded product can be suitably used as an interior material for automobile door trims, inner panels, pillar garnishes, rear packages, interior light lenses, and the like. In addition, it can also be used as building materials, civil engineering materials, packaging materials, daily necessities.
　本発明の形態を上記の構造を参照して説明したが、本発明の目的を逸脱せずに多くの交代、改良、変更が可能であることは当業者であれば明らかである。したがって本発明の形態は、添付された請求項の精神と目的と逸脱しない全ての交代、改良、変更を含み得る。 Although the embodiment of the present invention has been described with reference to the above-described structure, it will be apparent to those skilled in the art that many substitutions, improvements, and changes can be made without departing from the object of the present invention. Accordingly, aspects of the invention may include all alterations, modifications, and variations that do not depart from the spirit and scope of the appended claims.
　以下に、本発明の具体的な実施例について説明する。各実施例及び比較例で使用した熱可塑性樹脂や植物繊維及びその組成等は、表１に示すとおりである。 Hereinafter, specific examples of the present invention will be described. Table 1 shows the thermoplastic resins and plant fibers used in each Example and Comparative Example, and their compositions.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　これらの各材料を混練したうえで、２００℃で５５ｍｍ×５０ｍｍ×１ｍｍの扁平な板状に射出成形した。次いで、得られた各実施例及び比較例について、引張応力を測定した。その結果も表１に示す。 These materials were kneaded and injection molded into a flat plate of 55 mm × 50 mm × 1 mm at 200 ° C. Subsequently, the tensile stress was measured about each obtained Example and the comparative example. The results are also shown in Table 1.
　表１の結果から、植物繊維の含有率／平均繊維径が大きいほど熱可塑性樹脂と植物繊維との総界面積が大きくなり、これに伴い繊維強化プラスチック（樹脂成形体）の強度が向上する傾向が確認された。特に、含有率／平均繊維径が１．２以上であれば熱可塑性樹脂と植物繊維との総界面積が４８０ｃｍ２／ｃｍ３以上となりなり、実務レベルでも対応可能な程度の良好な強度が得られることが確認された。中でも、クラワ繊維やパイナップル繊維は、植物繊維の中でも特に繊維径が小さいことから、含有率／平均繊維径４．０以上、且つ熱可塑性樹脂と植物繊維との総界面積１７００ｃｍ２／ｃｍ３以上とすることもでき、高い強度が得られることが確認された。 From the results of Table 1, the larger the content ratio / average fiber diameter of the plant fiber, the larger the total interfacial area between the thermoplastic resin and the plant fiber, and accordingly, the strength of the fiber reinforced plastic (resin molded body) tends to improve. Was confirmed. In particular, if the content ratio / average fiber diameter is 1.2 or more, the total interfacial area between the thermoplastic resin and the plant fiber is 480 cm 2 / cm 3 or more, and a good strength that can be handled even at a practical level is obtained. It was confirmed that Among them, the Kurrawa fiber and the pineapple fiber have a particularly small fiber diameter among plant fibers, so that the content ratio / average fiber diameter is 4.0 or more and the total interface area between the thermoplastic resin and the plant fibers is 1700 cm 2 / cm 3 or more. It was confirmed that high strength was obtained.

Claims (1)

  1. 　熱可塑性樹脂と植物繊維とを含む繊維強化プラスチックであって、前記植物繊維の含有率（重量％）／平均繊維径（μｍ）が１．２以上であり、前記植物繊維と前記熱可塑性樹脂との界面積が４８０ｃｍ2／ｃｍ3以上である繊維強化プラスチック。
                                                                                         A fiber reinforced plastic containing a thermoplastic resin and a vegetable fiber, wherein the vegetable fiber content (% by weight) / average fiber diameter (μm) is 1.2 or more, and the plant fiber and the thermoplastic resin Is a fiber reinforced plastic having an interfacial area of 480 cm 2 / cm 3 or more.
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