JP2005081794A - Recycled fiber reinforced plastic molding - Google Patents

Recycled fiber reinforced plastic molding Download PDF

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Publication number
JP2005081794A
JP2005081794A JP2003319353A JP2003319353A JP2005081794A JP 2005081794 A JP2005081794 A JP 2005081794A JP 2003319353 A JP2003319353 A JP 2003319353A JP 2003319353 A JP2003319353 A JP 2003319353A JP 2005081794 A JP2005081794 A JP 2005081794A
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frp
molded product
resin
molding
recycled
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Inventor
Yuji Sawada
雄次 澤田
Tatsuji Watarai
達治 渡会
Masaichi Kaneko
正市 金子
Tetsuo Ito
哲夫 伊藤
Hisatoku Eguchi
久徳 江口
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Bridgestone Corp
DIC Corp
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Bridgestone Corp
Dainippon Ink and Chemicals Co Ltd
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Priority to JP2003319353A priority Critical patent/JP2005081794A/en
Publication of JP2005081794A publication Critical patent/JP2005081794A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/52Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/62Plastics recycling; Rubber recycling

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  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To reuse FRP waste as it is which cannot be disposed of sufficiently without requiring disposal sorting work or the like, and produce a new fiber reinforced plastic (FRP) molding product by using crushed matters of the FRP waste capable of being used as a reinforcing member of a recycled FRP molding product having the same characteristics. <P>SOLUTION: The recycled FRP molding is produced by the steps of crushing FRP waste materials to a size of 0.1-20 mm mean diameter, mixing this with a binder resin and required additives, charging the mixture into a mold for molding an FRP molding, and cross-linking the binder resin under heat and pressure. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、FRP廃材のリサイクル材を使用した新たなFRPリサイクル成形品に関するものであり、FRP廃材の破砕物を用いて新たなFRPリサイクル成形品を製造するものである。
The present invention relates to a new FRP recycled molded product using a recycled material of FRP waste material, and manufactures a new FRP recycled molded product using a crushed material of FRP waste material.

FRPプラスチック成形品は性状的に耐久性が高く、各種の製品として広く実用化されており、浴槽、浴室パネル、防水パン、浄化槽等の住宅用部材、パイプ、水槽等の建築用品部材、プ−ル、スライダ−、船舶、小型ボート、自動車部材、ヘルメット等の各種成形品が開発されている。   FRP plastic molded products are highly durable and widely used as various products. Household materials such as bathtubs, bathroom panels, waterproof pans, septic tanks, building supplies such as pipes and water tanks, Various types of molded articles such as steel rods, sliders, ships, small boats, automobile members, and helmets have been developed.

しかるに、かかる成形品が不要になった際(廃材)には、この優れた性状が逆に災いし分解したり、腐らせたりすることができず、ほとんど再利用もされず、焼却又は埋め立て処分することによって廃棄なされている。しかるに、この種のプラスチック成形品は成形の際に種々の薬品の配合がなされるため、焼却時に黒煙、有毒ガス、ダイオキシン等が発生すると指摘されている。更に、燃焼温度が高いため、焼却炉の寿命を縮めることがあり、場合によっては特別な焼却炉を必要とすることもある。特に、ガラス繊維にて強化されたFRPプラスチック成形品はガラス繊維が残るため、破砕だけされて埋め立て処分されている。   However, when such a molded product is no longer needed (waste material), this excellent property can be damaged, decomposed, rotted, and hardly reused, and incinerated or landfilled. It is discarded by doing. However, it has been pointed out that black smoke, toxic gas, dioxin and the like are generated during incineration because various types of chemicals are blended in this type of plastic molded product. Furthermore, because of the high combustion temperature, the life of the incinerator may be shortened, and in some cases, a special incinerator may be required. In particular, FRP plastic molded products reinforced with glass fibers are crushed and disposed of by landfill because glass fibers remain.

FRP廃材の利用法としては、セメント原燃料化としてのリサイクル技術が確立されているが、一部は燃やされるので完全なマテリアルリサイクルにはなっていない。一方、マテリアルリサイクルとしては、微粉砕して再度プラスチック等の充填剤としてリサイクルする技術の提案されているが、微粉砕するのに多額の費用がかかり経済的な面で実用化に至っていない。   As a method of using FRP waste materials, recycling technology has been established as a raw material for cement, but some materials are burned, so they are not completely recycled. On the other hand, as material recycling, a technique for finely pulverizing and reusing it as a filler such as plastic has been proposed, but it has been expensive to pulverize and has not been put into practical use in terms of economy.

そこで、FRP廃材を素材のまま再利用する方法として、例えば、特許文献1〜3にて提案されるように、FRP廃材の粉砕物に廃発泡スチロール、廃プラスチック、建設廃材含む木くずを混合して新たな成形品とする方法が提案されている。   Therefore, as a method for reusing the FRP waste material as it is, for example, as proposed in Patent Documents 1 to 3, a new mixture of waste styrene foam, waste plastic, and waste wood including construction waste material is mixed with the pulverized FRP waste material. There has been proposed a method for forming a molded article.

(1)特開平09−057753号(1) JP 09-057553 A (2)特開平10−290969号(2) JP-A-10-290969 (3)特開平11−114540号(3) JP-A-11-114540

しかし、これらのFRP廃材の破砕物と他の廃材を混ぜ合わせた成形品では、完全な混ぜ合わせが難しく、得られた成形品の物性が安定しなかったり、表面が粗いという問題点があった。   However, in the molded product obtained by mixing these FRP waste materials and other waste materials, it is difficult to completely mix them, and the physical properties of the obtained molded products are not stable or the surface is rough. .

一方、特許文献4には他のリサイクル手段が提案されており、熱硬化性FRP廃材の破砕物と熱可塑性プラスチック廃材の破砕物との混合物を得、これを加熱することで後者の破砕物を溶融し、ブロックやプレート状の成形品を得ようとするものであり、床材、舗装材に用いられる成形品が提案されている。   On the other hand, another recycling means is proposed in Patent Document 4, and a mixture of a crushed material of a thermosetting FRP waste material and a crushed material of a thermoplastic plastic material material is obtained, and the latter crushed material is obtained by heating the mixture. It is intended to obtain a block or plate-shaped molded product by melting, and a molded product used for a flooring material or a paving material has been proposed.

特開2002−275813号JP 2002-275813

かかる技術は十分優れた技術ではあるものの、その破砕の大きさを揃えたり、両者の混合割合が難しく、完全なものではなかった。
Although this technique is sufficiently excellent, it is not perfect because the size of the crushing is uniform and the mixing ratio of the two is difficult.

本発明は以上の従来技術に鑑みてなされたものであり、FRP廃材の再処理の際、そのFRP廃材の全量が再利用されるべく鋭意研究を重ね、本発明に到達したものである。
The present invention has been made in view of the above prior art, and has been accomplished through extensive research to recycle the entire amount of the FRP waste material when the FRP waste material is reprocessed.

本発明の要旨は、FRP廃材を平均0.5mm〜20mmの大きさに破砕し、これに好ましくは熱硬化性のバインダ−樹脂を加えて混合し、、当該混合物をFRPプラスチック成形品を形成する金型内に充填し、加熱加圧下に前記バインダ−樹脂を架橋させることを特徴とするFRP廃材を使用したリサイクル成形品にかかるものである。   The gist of the present invention is that an FRP waste material is crushed to an average size of 0.5 mm to 20 mm, and a thermosetting binder resin is preferably added thereto and mixed to form an FRP plastic molded product. The present invention relates to a recycle molded product using FRP waste material, which is filled in a mold and crosslinks the binder-resin under heat and pressure.

そして、バインダ−樹脂が、好ましくは不飽和ポリエステル樹脂、ビニルエステル樹脂、ウレタン樹脂、エポキシ樹脂等の熱硬化性樹脂である請求項1記載のFRPリサイクル成形品である。
The FRP recycled molded product according to claim 1, wherein the binder resin is preferably a thermosetting resin such as an unsaturated polyester resin, a vinyl ester resin, a urethane resin, or an epoxy resin.

本発明によれば、今まで十分でなかったFRP廃材の廃棄が、廃棄分別作業等が不要でそのまま再利用可能となったものであり、例えば、同種の性状を持つFRPプラスチック成形品の補強部材として利用可能となったもので、その実用価値は高い。
According to the present invention, the disposal of FRP waste material that has not been sufficient up to now can be reused as it is without requiring waste separation work or the like. For example, a reinforcing member for an FRP plastic molded product having the same kind of properties As it has become available, its practical value is high.

先ず、本発明のFRP廃材の破砕からFRPリサイクル成形品を得る工程を示すと、FRP廃材を重機で粗破砕する工程、粉砕機で粗粉砕する工程、メッシュにて分級する工程、分級された粉砕物にバインダ−樹脂と硬化剤等の配合物を配合し、ミキサ−にて均一に混合する工程、成形用の金型に充填する工程、プレスにて型押し、加温して硬化させる工程、金型より脱型して成形品を得る工程を通るものである。   First, the process of obtaining an FRP recycled molded product from the crushing of the FRP waste material of the present invention is shown: the process of roughly crushing the FRP waste material with a heavy machine, the process of coarse crushing with a crusher, the process of classifying with a mesh, the classified crushing Compounding a compound such as a binder resin and a curing agent into the product, mixing the mixture uniformly with a mixer, filling the mold for molding, stamping with a press, heating and curing, It passes through the process of removing the mold from the mold and obtaining a molded product.

ここで得られた成形品はそのままで完成品とはなるが、最も好ましい使用法は、これを再度FRP成形品の一部に用いるものであり、これによって完全な再利用が完成することになる。このリサイクルの工程を例えば、FRPプラスチック成形品の製造工程を例にとって説明すると、上記した工程により、板状の成形品を得、この板状品はハンドレイアップ法によって製造する際の補強材とされるもので、通常は木材が用いられるが、この代替品として用いることになる。勿論、予め補強材として最適なように、その厚さ、形状等が特定された金型内にて成形されたものであり、予備成形品として得られることになる。   The molded product obtained here becomes the finished product as it is, but the most preferable usage is to use it again as a part of the FRP molded product, thereby completing the complete reuse. . The recycling process will be described by taking, for example, the manufacturing process of an FRP plastic molded product as an example. By the above-described process, a plate-shaped molded product is obtained. Wood is usually used, but it will be used as an alternative. Of course, it is molded in a mold whose thickness, shape and the like are specified in advance so as to be optimal as a reinforcing material, and is obtained as a preformed product.

さて、成形型にゲルコ−トする工程、次いで上記予備成形品を所定の位置に置く工程、オ−バ−レイする工程、加熱炉に入れ、硬化する工程、脱型して完成品を得る工程からなる。この場合、合板を使用するよりも最適な形として予備成形品が得られているため、部品装着の間違いがなく、手間が省けるという特徴がある。又、この予備成形品は完成品が型より脱型し易いような形状が予め取られ得るもので、更に、断熱材や電磁シ−ルド材等を予備成形品を得る段階でインサ−トしておくことができるため、機能的な成形品が容易に成形できることともなる。尚、合板を用いた場合には、そりが発生したり、木質であるため腐ってしまうことがあるが、かかる欠点もないという特徴がある。   Now, the step of gel coating on a mold, the step of placing the preformed product in a predetermined position, the step of overlaying, the step of placing in a heating furnace and curing, the step of demolding to obtain a finished product Consists of. In this case, since the preform is obtained as an optimum shape rather than using a plywood, there is a feature that there is no mistake in component mounting and labor can be saved. In addition, this preform can be pre-shaped so that the finished product can be easily removed from the mold, and further, a heat insulating material or an electromagnetic shield material is inserted at the stage of obtaining the preform. Therefore, a functional molded product can be easily molded. When plywood is used, warpage may occur or it may rot because it is woody, but there is a feature that there is no such disadvantage.

本発明は、例えば、ハンドレイアップ、スプレイアップ、レジントランスファ−モ−ルディング各成形法に用いられ、特に、木製補強を通常使用しているFRP成形に適しており、その際の具体的な工程としては、本発明のFRP破砕物及び樹脂混合物を金型内に充填する際に、ガラスマット及び/又はガラスクロスのプレプリグをその表面(片面乃至は両面)に貼ること、及び/又は混合物中に挿入することが考えられる。   The present invention is used for, for example, hand lay-up, spray-up, and resin transfer molding methods. In particular, the present invention is suitable for FRP molding in which a wooden reinforcement is normally used. As the FRP crushed material and the resin mixture of the present invention are filled in the mold, a glass mat and / or a glass cloth prepreg is pasted on the surface (one side or both sides), and / or in the mixture. It is possible to insert.

本発明のFRP廃材とは、繊維強化材と熱硬化性樹脂との混合硬化成形物であり、好ましくはガラス繊維強化熱硬化性樹脂成形品であり、更に好ましくは、ガラス繊維強化材と不飽和ポリエステル樹脂との成形品である。この成形品を破砕したのが、FRP成形品の破砕物である。その破砕方法はいかなる方法でもかまわないが、通常の破砕機で破砕できる安価な粗粉砕片を用いる方が好ましい。該破砕物の平均直径は、好ましくは0.1〜20mmで、平均の厚みは、好ましくは0.5〜15mmである。   The FRP waste material of the present invention is a mixed cured molded product of a fiber reinforcing material and a thermosetting resin, preferably a glass fiber reinforced thermosetting resin molded product, and more preferably a glass fiber reinforcing material and an unsaturated material. Molded product with polyester resin. This molded product was crushed into a FRP molded product. The crushing method may be any method, but it is preferable to use an inexpensive coarsely pulverized piece that can be crushed with a normal crusher. The average diameter of the crushed material is preferably 0.1 to 20 mm, and the average thickness is preferably 0.5 to 15 mm.

FRP廃材の具体例としては、例えば浴槽、浴室パネル、防水パン、洗面化粧台、洗面ボール、台所カウンター、浄化槽等の住宅用部材、パイプ、水槽、等の工業用部材、各種電気部品等、船舶、小型ボート、自動車部材、ヘルメット、マネキン、椅子等の各種成形品が挙げられる。   Specific examples of FRP waste materials include, for example, bathtubs, bathroom panels, waterproof pans, vanity tables, wash bowls, kitchen counters, housing components such as septic tanks, industrial members such as pipes and water tanks, various electrical components, and ships. And various molded articles such as small boats, automobile members, helmets, mannequins, chairs and the like.

FRP廃材の主体は熱硬化性樹脂で、例えば、不飽和ポリエステル樹脂、フェノール樹脂、メラミン樹脂、エポキシ樹脂等であり、通常は不飽和ポリエステル樹脂である。   The main component of the FRP waste material is a thermosetting resin, such as an unsaturated polyester resin, a phenol resin, a melamine resin, or an epoxy resin, and is usually an unsaturated polyester resin.

破砕物中の繊維強化材とは、無機繊維で、例えば、ガラス繊維、金属繊維、セラミック繊維であり、通常はガラス繊維である。このガラス繊維はそのまま次の成形品の補強材となり、リサイクルされることになる。   The fiber reinforcing material in the crushed material is an inorganic fiber, such as a glass fiber, a metal fiber, or a ceramic fiber, and is usually a glass fiber. This glass fiber becomes a reinforcing material for the next molded product as it is and is recycled.

バインダ−樹脂としては、前記した熱硬化性樹脂がそのまま用いられ、これに各種の硬化促進剤等必要な配合材料が加えられる。   As the binder resin, the above-described thermosetting resin is used as it is, and necessary compounding materials such as various curing accelerators are added thereto.

FRP廃材の破砕物とバインダ−樹脂との混合割合は、95〜50:5〜50(重量比)であり、ニ−ダ−、押出機等の混合装置で混合する。   The mixing ratio of the crushed FRP waste material and the binder resin is 95 to 50: 5 to 50 (weight ratio) and is mixed by a mixing device such as a kneader or an extruder.

本発明にて得られたリサイクル成形品は、そのままでもFRPプラスチック成形品としての完成品が得られるが、FRPプラスチック成形品の一部として、例えば、成形品の補強材として用いて完全リサイクル化ができ、具体的には、前述したように、ハンドレイアップ成形法やスプレーアップ成形の際に成形品の補強材として用いられるものである。通常この種の補強材は木材が用いられるが、FRP成形品とは異物であるため、接着剥離があったり、木材のためにそりが発生したり、腐敗がもたらされる危険性があるが、本発明の補強材は基本的に同種の樹脂が用いられるためにこれらの欠点が取り除かれ、更に再々処理の際にもその分離は不要で、破砕作業も簡単となるという特徴がある。
The recycled molded product obtained in the present invention can be used as it is to obtain a finished product as an FRP plastic molded product. However, as a part of the FRP plastic molded product, for example, it can be completely recycled as a reinforcing material for the molded product. Specifically, as described above, it is used as a reinforcing material for a molded product in the hand lay-up molding method or spray-up molding. Usually, this type of reinforcement is made of wood, but because it is a foreign material from the FRP molded product, there is a risk that it will peel off, warp due to the wood, or spoilage. Since the same kind of resin is basically used for the reinforcing material of the invention, these disadvantages are eliminated, and further, the separation is unnecessary even in the re-processing, and the crushing operation is simplified.

汎用FRP製バスユニット成形品(べ−ジュ色)を破砕し、直径8mm穴のメッシュ通過物880重量部と、バインダ−樹脂として予め6%ナフテン酸コバルトを0.2%添加した不飽和ポリエステル樹脂(ポリライトPM400(大日本インキ化学工業(株)製)120重量部、硬化促進剤(パ−メックN(日本油脂(株))1.2重量部を加え、フック式の攪拌翼を備えた万能混合機で約5分間均一に混合した。   General-purpose FRP bus unit molded product (veige color) is crushed, 880 parts by weight of 8 mm diameter mesh passing material, and 0.2% of 6% cobalt naphthenate is added as a binder resin in advance. (Polylite PM400 (Dainippon Ink & Chemicals, Inc.) 120 parts by weight, curing accelerator (Parmec N (Nippon Yushi Co., Ltd.) 1.2 parts by weight) and a hook type stirring blade The mixture was mixed uniformly for about 5 minutes.

離型剤処理をした縦15cm、横22cm、深さ2cmで容積660cm3 の金型内に、上記で準備した混合物726gを充填し、表面が平滑になるようにした後、上蓋をし、60℃成形用プレスに前述の金型をセットして0.6MPaの圧力で60分保持した。開圧して縦15cm、横22cm、厚さ2cmの板材を得た。尚、この板材はハンドレイアップ成形法に用いる成形品の補強材である。 Into a mold having a length of 15 cm, a width of 22 cm, a depth of 2 cm and a volume of 660 cm 3 treated with a release agent, 726 g of the mixture prepared above was filled to make the surface smooth, and then the top cover was applied. The above-mentioned mold was set in a press for forming at 0 ° C. and held at a pressure of 0.6 MPa for 60 minutes. The pressure was released to obtain a plate material having a length of 15 cm, a width of 22 cm, and a thickness of 2 cm. In addition, this board | plate material is a reinforcing material of the molded article used for a hand layup molding method.

得られた成形品の物性は、外観がベ−ジュ色であり、曲げ強度が8.7MPa、曲げ弾性率0.5GPa、板密度が1.1g/cm3 であった。
The physical properties of the obtained molded product were beige in appearance, the bending strength was 8.7 MPa, the bending elastic modulus was 0.5 GPa, and the plate density was 1.1 g / cm 3 .

本発明によれば、基本的に埋め立て処分しかできなかったFRP廃材が再度プラスチック成形品として生まれ変わることになり、しかも、FRPプラスチック成形品の予備成形品として用いられる場合には、完全なマテリアルリサイクルとして有力な手法となったものでその利用の範囲は極めて広い。

According to the present invention, the FRP waste material that could basically only be disposed of by landfill will be reborn as a plastic molded product, and when used as a preformed product of an FRP plastic molded product, as a complete material recycling It has become a powerful method and its range of use is extremely wide.

Claims (4)

FRP廃材を平均径0.1〜20mmの大きさに破砕し、これにバインダ−樹脂及び必要な配合剤を加えて混合し、当該混合物をFRPプラスチック成形品を形成する金型内に充填し、加熱加圧下に前記バインダ−樹脂を架橋させることを特徴とするFRPリサイクル成形品。   FRP waste material is crushed to an average diameter of 0.1 to 20 mm, a binder resin and a necessary compounding agent are added and mixed, and the mixture is filled in a mold for forming an FRP plastic molded product, An FRP recycled molded product obtained by crosslinking the binder-resin under heat and pressure. FRP廃材が、熱硬化性樹脂に繊維強化材を混合して硬化したFRP成形品である請求項1記載のFRPリサイクル成形品。   The FRP recycled molded product according to claim 1, wherein the FRP waste material is an FRP molded product obtained by mixing a fiber reinforced material with a thermosetting resin and curing. バインダ−樹脂が、熱硬化性樹脂である請求項1記載のFRPリサイクル成形品。   The FRP recycled molded product according to claim 1, wherein the binder resin is a thermosetting resin. バインダ−樹脂が、不飽和ポリエステル樹脂、ビニルエステル樹脂、ウレタン樹脂、エポキシ樹脂である請求項3記載のFRPリサイクル成形品。

4. The FRP recycled molded product according to claim 3, wherein the binder resin is an unsaturated polyester resin, vinyl ester resin, urethane resin, or epoxy resin.

JP2003319353A 2003-09-11 2003-09-11 Recycled fiber reinforced plastic molding Pending JP2005081794A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8361358B2 (en) * 2007-03-06 2013-01-29 Astoria Industries Of Iowa, Inc. Method of recycling fiberglass reinforced plastics
CN105014824A (en) * 2015-08-10 2015-11-04 郴州湘南麻业有限公司 Waste fiber textile recycling method
KR20200015667A (en) * 2019-02-25 2020-02-12 김길수 Manufacturing method for molded article using fiber reinforcerd plastic waste comprising thermosetting plastics and molded article using the same
CN113799295A (en) * 2021-07-29 2021-12-17 蓝月再生资源(山东)有限公司 Waste resin-based composite material glass fiber reinforced plastic recovery process

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8361358B2 (en) * 2007-03-06 2013-01-29 Astoria Industries Of Iowa, Inc. Method of recycling fiberglass reinforced plastics
CN105014824A (en) * 2015-08-10 2015-11-04 郴州湘南麻业有限公司 Waste fiber textile recycling method
KR20200015667A (en) * 2019-02-25 2020-02-12 김길수 Manufacturing method for molded article using fiber reinforcerd plastic waste comprising thermosetting plastics and molded article using the same
KR102291931B1 (en) 2019-02-25 2021-08-23 주식회사 엔이티 Manufacturing method for molded article using fiber reinforcerd plastic waste comprising thermosetting plastics and molded article using the same
CN113799295A (en) * 2021-07-29 2021-12-17 蓝月再生资源(山东)有限公司 Waste resin-based composite material glass fiber reinforced plastic recovery process

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