JPH0699160A - Method for treating carbon fiber reinforced plastic - Google Patents

Method for treating carbon fiber reinforced plastic

Info

Publication number
JPH0699160A
JPH0699160A JP25144592A JP25144592A JPH0699160A JP H0699160 A JPH0699160 A JP H0699160A JP 25144592 A JP25144592 A JP 25144592A JP 25144592 A JP25144592 A JP 25144592A JP H0699160 A JPH0699160 A JP H0699160A
Authority
JP
Japan
Prior art keywords
plastic
carbon fiber
cfrp
temperature
fiber reinforced
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP25144592A
Other languages
Japanese (ja)
Other versions
JP3180463B2 (en
Inventor
Seishiro Ichikawa
征四郎 市川
Akira Nishimura
明 西村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toray Industries Inc
Original Assignee
Toray Industries Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toray Industries Inc filed Critical Toray Industries Inc
Priority to JP25144592A priority Critical patent/JP3180463B2/en
Publication of JPH0699160A publication Critical patent/JPH0699160A/en
Application granted granted Critical
Publication of JP3180463B2 publication Critical patent/JP3180463B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • B29B2017/0424—Specific disintegrating techniques; devices therefor
    • B29B2017/0496—Pyrolysing the materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2707/00—Use of elements other than metals for preformed parts, e.g. for inserts
    • B29K2707/04—Carbon
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Abstract

PURPOSE:To recover carbon fibers at a high yield and to recycle them obviating the need of reclamation by treating carbon fiber reinforced plastic in a specified gas atomosphere without combustion and decomposing the plastic thermally. CONSTITUTION:In a method for treating carbon fiber reinforced plastic (CFRP), CFRP is treated in a gas atomosphere of oxygen content 3-18vol.% and of temperature 300-600 deg.C without combustion to decompose the plastic thermally. During the treatment, the temperature of CFRP increases gradually from its outer part and after a while the temperature, as a whole, reaches that of the atomosphere. In this process, the plastic having a hypergolic property decomposes thermally not only from its outer part but also from its inner part. On the other hand, since the carbon fibers are embedded in the plastic and surrounded by it, they are protected from being oxidized until the completion of the thermal decomposition of the plastic. Accordingly, if the treatment is ended at the completion of the thermal decomposition of the plastic, the carbon fibers can be protected from oxidation.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明は、炭素繊維強化プラス
チック（以下、ＣＦＲＰという）を、それから炭素繊維
を回収するために処理する方法に関する。この発明の方
法によって回収した炭素繊維は、粉砕し、ゴムや熱可塑
性樹脂中に混入してその耐摩擦性を向上させたり、セメ
ント、モルタル、コンクリートなどに混入してその力学
的特性を向上させたりするのに使用することができる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating carbon fiber reinforced plastic (hereinafter referred to as CFRP) to recover carbon fiber therefrom. The carbon fiber recovered by the method of the present invention is crushed and mixed in rubber or thermoplastic resin to improve its abrasion resistance, or mixed in cement, mortar, concrete or the like to improve its mechanical properties. It can be used to

【０００２】[0002]

【従来の技術】ＣＦＲＰは、比強度や比弾性率が高く、
耐熱性や耐食性などの諸特性にも優れていることから、
よく知られているように、航空・宇宙用途や、ゴルフク
ラブ、テニスラケットなどのスポーツ用途や、医療用途
など、いろいろな分野で広く利用されている。2. Description of the Related Art CFRP has high specific strength and specific elastic modulus,
Since it has excellent properties such as heat resistance and corrosion resistance,
As is well known, it is widely used in various fields such as aerospace applications, sports applications such as golf clubs and tennis rackets, and medical applications.

【０００３】そのようなＣＦＲＰは、炭素繊維としてポ
リアクリロニトリル系炭素繊維やピッチ系炭素繊維を使
用し、マトリクスとしてエポキシ樹脂や不飽和ポリエス
テル樹脂などのプラスチックを使用したものが多いが、
製造工程で発生する屑類や、不要になったものの処理が
やっかいであるという問題がある。燃やしても、プラス
チックは容易に燃焼するが、炭素繊維はほとんど残渣と
して残るからである。そのため、ＣＦＲＰは、廃棄物処
理上は不燃物に分類され、埋立処理されている。しかし
ながら、近年、埋立地の確保が難しいうえに、確保でき
たとしても周囲の環境を悪化させるといった問題があ
り、対策が望まれている。また、埋立処理は、資源の再
利用という観点からも好ましいことではない。In many of such CFRPs, polyacrylonitrile-based carbon fibers or pitch-based carbon fibers are used as the carbon fibers, and plastics such as epoxy resin and unsaturated polyester resin are used as the matrix.
There is a problem in that it is difficult to dispose of scraps generated in the manufacturing process and those that are no longer needed. This is because even if burned, the plastic easily burns, but most of the carbon fiber remains as a residue. Therefore, CFRP is classified as a non-combustible material in terms of waste disposal and is landfilled. However, in recent years, it is difficult to secure a landfill site, and even if it can be secured, there is a problem of deteriorating the surrounding environment, and countermeasures are desired. In addition, landfill processing is not preferable from the viewpoint of resource reuse.

【０００４】[0004]

【発明が解決しようとする課題】この発明の目的は、Ｃ
ＦＲＰから炭素繊維を高収率で回収することができ、Ｃ
ＦＲＰの埋立処理を不要とするばかりか、炭素繊維の再
利用を可能にする方法を提供するにある。The object of the present invention is to provide C
Carbon fiber can be recovered from FRP in high yield, and C
It is an object of the present invention to provide a method which makes it possible not only to eliminate the landfill treatment of FRP but also to reuse carbon fiber.

【０００５】[0005]

【課題を解決するための手段】この発明は、上記目的を
達成するために、ＣＦＲＰを、酸素濃度が３〜１８体積
％の範囲内で、温度が３００〜６００℃の範囲内のガス
雰囲気下で燃焼させないで処理し、プラスチックを熱分
解することを特徴とする、炭素繊維強化プラスチックの
処理方法を提供する。なお、ＣＦＲＰとは、一般的に
は、マトリクスがエポキシ樹脂、不飽和ポリエステル樹
脂、フェノール樹脂などの熱硬化性樹脂であるものをい
うが、この発明においては、ナイロン樹脂、ポリエステ
ル樹脂などの熱可塑性樹脂をマトリクスとするものも含
めるものとする。また、炭素繊維には黒鉛繊維をも含め
るものとする。そして、ＣＦＲＰには、炭素繊維が、短
繊維や連続繊維の形態で使用されているものや、織物や
マットなどの布帛形態で使用されているものなど、いろ
いろなものがあるが、この発明はどのような形態の炭素
繊維を使用したものにも適用できる。In order to achieve the above object, the present invention provides CFRP in a gas atmosphere in which the oxygen concentration is in the range of 3 to 18% by volume and the temperature is in the range of 300 to 600 ° C. Disclosed is a method for treating carbon fiber reinforced plastics, which comprises treating the plastics without burning them to thermally decompose the plastics. CFRP generally means that the matrix is a thermosetting resin such as an epoxy resin, an unsaturated polyester resin, or a phenol resin, but in the present invention, a thermoplastic resin such as a nylon resin or a polyester resin is used. A resin matrix is also included. Further, graphite fibers are also included in the carbon fibers. There are various CFRPs, such as those in which carbon fibers are used in the form of short fibers or continuous fibers, and those in the form of cloth such as woven fabrics and mats. It can be applied to any type of carbon fiber.

【０００６】さて、この発明においては、ＣＦＲＰを、
酸素濃度が３〜１８体積％の範囲内で、かつ、温度が３
００〜６００℃の範囲内のガス雰囲気下で燃焼させない
で処理する。In the present invention, CFRP is
The oxygen concentration is within the range of 3 to 18% by volume, and the temperature is 3
Processing is performed without burning in a gas atmosphere in the range of 00 to 600 ° C.

【０００７】処理は、各種の加熱炉を使用して、連続的
に、またはバッチとして行うことができる。この処理に
おいては、ＣＦＲＰを一様に加熱するのが好ましい。そ
のために、大きなＣＦＲＰはあらかじめ破砕しておくの
がよい。たとえば、３〜５０cmほどの大きさに破砕して
おくと、雰囲気ガスとの良好な接触が保たれ、昇温速度
や処理速度の差が小さくなって効率的な処理を行うこと
ができるようになる。なお、効率的な処理を行うため
に、加熱炉の種類などによっては、ＣＦＲＰを金網など
の多孔体の上に載せ、その目を貫通する方向に雰囲気ガ
スを流通させるようにするのが好ましい。The treatment can be carried out continuously or as a batch using various heating furnaces. In this treatment, it is preferable to uniformly heat the CFRP. Therefore, it is preferable to crush the large CFRP in advance. For example, if it is crushed to a size of about 3 to 50 cm, good contact with atmospheric gas is maintained, the difference in temperature rising rate and processing rate is reduced, and efficient processing can be performed. Become. In order to perform an efficient treatment, depending on the type of heating furnace, it is preferable that CFRP is placed on a porous body such as a wire mesh and the atmospheric gas is circulated in a direction penetrating the eyes.

【０００８】さて、この発明において重要なことは、処
理に際して、ＣＦＲＰが、炎を発して急激に酸化しない
ようにすること、すなわち、燃焼しないようにすること
である。燃焼は、同時に発熱を伴うので、ＣＦＲＰは、
通常、１０００℃以上もの高温になる。しかも、燃焼し
ているＣＦＲＰの各部の温度に大きな差ができ、炎の温
度も部位によって数百℃の温度差があるのでその炎に触
れて燃焼が伝播するＣＦＲＰにもまた、部位によって大
きな温度差ができる。そのため、処理温度の制御ができ
なくなり、また、炭素繊維が酸化して回収率が低下する
ばかりか、回収できても特性の低下が大きく、再利用が
困難になる。また、炭素繊維の単位重量当りの回収コス
トも上昇する。そのような理由で、この発明において
は、ＣＦＲＰを燃焼させないでプラスチックのみを選択
的に熱分解する。この熱分解によって、プラスチック
は、ＣＯ、ＣＯ2 、Ｈ2 Ｏなどのガスになる。What is important in the present invention is to prevent the CFRP from emitting a flame and being rapidly oxidized during the treatment, that is, to prevent burning. Since combustion is accompanied by heat generation at the same time, CFRP
Usually, the temperature is as high as 1000 ° C or higher. Moreover, there is a large difference in the temperature of each part of the burning CFRP, and the temperature of the flame also differs by several hundred degrees Celsius depending on the part. There is a difference. Therefore, the treatment temperature cannot be controlled, and the carbon fiber is oxidized to reduce the recovery rate. Even if the carbon fiber can be recovered, the characteristics are largely deteriorated and the reuse becomes difficult. Further, the recovery cost per unit weight of carbon fiber also increases. For that reason, in the present invention, only the plastic is selectively pyrolyzed without burning the CFRP. By this thermal decomposition, the plastic becomes a gas such as CO, CO 2 and H 2 O.

【０００９】このように、燃焼を起こさせないでプラス
チックのみを選択的に熱分解し、炭素繊維を回収するた
めに、この発明においては、雰囲気ガス中の酸素濃度を
３〜１８体積％の範囲に制御する。酸素濃度が３体積％
未満であるときは、燃焼は起こらないものの熱分解の速
度が遅くなって処理に時間がかかり、処理コストが上昇
する。また、１８体積％を超えると、燃焼を引き起こし
たり、熱分解によって発生したガスに引火して爆発する
ことがある。なお、雰囲気ガスとしては、上述した範囲
の酸素を含む窒素ガスなどを使用するが、熱分解の進行
に伴って発生するガスによって酸素濃度が下がってくる
ので、酸素濃度を絶えず制御する。As described above, in order to selectively pyrolyze only the plastic without burning and recover the carbon fibers, in the present invention, the oxygen concentration in the atmospheric gas is set in the range of 3 to 18% by volume. Control. Oxygen concentration is 3% by volume
When it is less than the above, although the combustion does not occur, the rate of thermal decomposition is slowed down, the treatment takes time, and the treatment cost increases. On the other hand, if it exceeds 18% by volume, combustion may occur or the gas generated by thermal decomposition may ignite and explode. Although nitrogen gas containing oxygen in the above-mentioned range is used as the atmospheric gas, the oxygen concentration is constantly controlled because the oxygen concentration is lowered by the gas generated as the thermal decomposition progresses.

【００１０】また、処理温度は、３００〜６００℃の範
囲に設定する。３００℃未満でも熱分解は起こるが、速
度が遅く、処理に時間がかかるので実用的でない。ま
た、６００℃を超えると、熱分解が急激に起こり、プラ
スチックが残存したり、逆に、炭素繊維の酸化が進んだ
りする。The processing temperature is set in the range of 300 to 600 ° C. Pyrolysis occurs even at less than 300 ° C, but it is not practical because the rate is slow and the treatment takes time. On the other hand, when the temperature exceeds 600 ° C., thermal decomposition rapidly occurs, the plastic remains, and conversely, the oxidation of the carbon fiber proceeds.

【００１１】処理に要する時間は、短すぎるとプラスチ
ックが残存する。また、長すぎると炭素繊維の酸化が進
み、回収率が低下するばかりか、炭素繊維の劣化を招
く。また、処理コストが上昇する。したがって、あらか
じめ実験で時間に対する炭素繊維の重量減少曲線を求め
ておき、プラスチックの重量に相当する減量が起こった
時点で処理を終了するようにするのがよい。If the processing time is too short, the plastic remains. On the other hand, if it is too long, oxidation of the carbon fibers proceeds, the recovery rate decreases, and the carbon fibers deteriorate. In addition, the processing cost increases. Therefore, it is preferable that the weight loss curve of the carbon fiber with respect to time is obtained in advance by experiment, and the treatment is terminated when the weight loss corresponding to the weight of the plastic occurs.

【００１２】上述した処理においては、ＣＦＲＰの温度
は、外側から徐々に上がり、やがて全体が雰囲気温度に
達する。この過程で、自燃性を有するプラスチックは、
外側のみならず内側からも熱分解する。一方、炭素繊維
はプラスチックに埋没されているので、プラスチックの
熱分解が終わらない間は周囲がプラスチックで覆われて
いることになり、酸化を免れる。したがって、プラスチ
ックの熱分解が終了した時点で処理を打ち切れば、すな
わち降温すれば、炭素繊維を酸化から保護することがで
きる。回収率が、７０％以上、好ましくは８０％以上に
なるようにするのがよい。なお、プラスチックの種類に
よって熱分解の挙動が異なるので、処理は、同じ種類の
ＣＦＲＰか、熱分解の挙動が似ているプラスチックを使
用したＣＦＲＰについて行うのが好ましい。In the above-mentioned process, the temperature of CFRP gradually rises from the outside, and eventually the whole reaches the ambient temperature. During this process, the self-flammable plastic
Thermal decomposition not only from the outside but also from the inside. On the other hand, since the carbon fiber is buried in the plastic, the surroundings are covered with the plastic before the thermal decomposition of the plastic is completed, and the carbon fiber is protected from oxidation. Therefore, if the treatment is terminated when the thermal decomposition of the plastic is completed, that is, if the temperature is lowered, the carbon fiber can be protected from oxidation. The recovery rate is 70% or more, preferably 80% or more. Since the behavior of thermal decomposition differs depending on the type of plastic, it is preferable to perform the treatment on the same type of CFRP or on CFRP using plastic having similar thermal decomposition behavior.

【００１３】[0013]

【実施例】【Example】

実施例１ 東レ株式会社製ポリアクリロニトリル系炭素繊維“トレ
カ”Ｔ３００−３Ｋ（平均単糸径：７μｍ、単糸数３，
０００本）からなる平織物（織密度：経方向、緯方向と
もに４本／cm）とエポキシ樹脂とからなる、炭素繊維の
割合が６３重量％のＣＦＲＰを処理した。Example 1 Toray Industries, Inc. polyacrylonitrile-based carbon fiber “Torayca” T300-3K (average single yarn diameter: 7 μm, single yarn number 3,
CFRP having a carbon fiber content of 63% by weight and made of a plain woven fabric (woven fabric: weave density: 4 yarns / cm in both warp and weft directions) and epoxy resin was treated.

【００１４】ＣＦＲＰは、厚さ２．５mmの板状のもの
を、大きさが５〜１５cm、重量平均で８．５cmになるよ
うに破砕し、その６１６ｇ（炭素繊維の量：６１６ｇ×
０．６３＝３８８ｇ）を２０メッシュの金網上に載せて
電気炉に入れた。炉内には、酸素濃度が１１％の窒素ガ
スを送り込むとともに、発生したガスとともに排気する
ようにした。CFRP was crushed into a plate having a thickness of 2.5 mm so as to have a size of 5 to 15 cm and a weight average of 8.5 cm, and 616 g thereof (amount of carbon fiber: 616 g ×
0.63 = 388 g) was placed on a wire mesh of 20 mesh and put in an electric furnace. A nitrogen gas having an oxygen concentration of 11% was fed into the furnace and was exhausted together with the generated gas.

【００１５】炉内を６００℃に昇温し、３０分処理し
た。このとき、炉内の酸素濃度を測定したところ、１
０．２体積％であった。３０分経過後、ＣＦＲＰ中のプ
ラスチックは熱分解してなくなっており、３８０ｇの炭
素繊維のみが残され、炭素繊維の回収率は９８％であっ
た。The inside of the furnace was heated to 600 ° C. and treated for 30 minutes. At this time, when the oxygen concentration in the furnace was measured, it was 1
It was 0.2% by volume. After 30 minutes, the plastic in CFRP was thermally decomposed and disappeared, leaving only 380 g of carbon fiber and the recovery rate of carbon fiber was 98%.

【００１６】実施例２ 実施例１において、炉内温度を４００℃、処理時間を２
時間としたところ、回収率は９７．５％であった。Example 2 In Example 1, the furnace temperature was 400 ° C. and the treatment time was 2
The recovery rate was 97.5% over time.

【００１７】実施例３ 実施例１において、炉内温度を６００℃、処理時間を１
時間としたところ、回収率は７９％であった。Example 3 In Example 1, the furnace temperature was 600 ° C. and the treatment time was 1
The recovery rate was 79% over time.

【００１８】[0018]

【比較例】[Comparative example]

比較例１ 実施例１において、炉内に空気を送り込んで処理したと
ころ、加熱開始から２分後にＣＦＲＰが燃え上がり、燃
焼が１５分ほど続き、自然消火した。残存した炭素繊維
の重量を測定したところ、２１３ｇであり、酸化、減量
が進んでいて回収率は５５％にとどまった。Comparative Example 1 In Example 1, when air was sent into the furnace for treatment, CFRP burned up 2 minutes after the start of heating, combustion continued for about 15 minutes, and spontaneous fire extinguishing occurred. When the weight of the remaining carbon fiber was measured, it was 213 g, and the recovery rate was 55% due to the progress of oxidation and weight reduction.

【００１９】比較例２ 実施例１において、炉内温度を３００℃とし、６時間処
理したが、処理はほとんど進まず、処理前とほとんど変
わらない、６１０ｇのＣＦＲＰが残存した。Comparative Example 2 In Example 1, the temperature in the furnace was 300 ° C. and the treatment was carried out for 6 hours. However, the treatment hardly progressed and 610 g of CFRP remained which was almost the same as that before the treatment.

【００２０】比較例３ 実施例１において、炉内温度を７００℃とし、処理時間
を４０分としたところ、回収率は６３％であった。処理
温度が高いため、炭素繊維の酸化、減量が進んだためで
ある。Comparative Example 3 In Example 1, when the furnace temperature was 700 ° C. and the treatment time was 40 minutes, the recovery rate was 63%. This is because the treatment temperature is high and the carbon fiber has been oxidized and reduced in weight.

【００２１】[0021]

【発明の効果】この発明は、ＣＦＲＰを、酸素濃度が３
〜１８体積％の範囲内で、温度が３００〜６００℃の範
囲内のガス雰囲気下で燃焼させないで処理し、プラスチ
ックを熱分解するので、実施例と比較例との対比からも
明らかなように、ＣＦＲＰから炭素繊維を高収率で回収
することができるようになり、ＣＦＲＰの埋立処理を不
要とするばかりか、炭素繊維の再利用が可能になる。INDUSTRIAL APPLICABILITY According to the present invention, CFRP has an oxygen concentration of 3
In the range of -18% by volume, the treatment is carried out in a gas atmosphere in the range of 300 to 600 ° C without burning, and the plastic is pyrolyzed. Therefore, as is clear from the comparison between the example and the comparative example. , CFRP can be recovered from CFRP in a high yield, and not only the landfill treatment of CFRP is unnecessary but also the carbon fiber can be reused.

フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｂ２９Ｋ 105:04 105:26 Continuation of front page (51) Int.Cl. 5 Identification number Office reference number FI technical display area // B29K 105: 04 105: 26

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】炭素繊維強化プラスチックを、酸素濃度が
３〜１８体積％の範囲内で、温度が３００〜６００℃の
範囲内のガス雰囲気下で燃焼させないで処理し、プラス
チックを熱分解することを特徴とする、炭素繊維強化プ
ラスチックの処理方法。1. A pyrolysis of a plastic by treating a carbon fiber reinforced plastic without burning in a gas atmosphere having an oxygen concentration in the range of 3 to 18% by volume and a temperature in the range of 300 to 600 ° C. A method for treating a carbon fiber reinforced plastic, characterized by: 【請求項２】破砕した炭素繊維強化プラスチックを、酸
素濃度が３〜１８体積％の範囲内で、温度が３００〜６
００℃の範囲内のガス雰囲気下で燃焼させないで処理
し、プラスチックを熱分解して炭素繊維を回収すること
を特徴とする、炭素繊維強化プラスチックの処理方法。2. A crushed carbon fiber reinforced plastic having an oxygen concentration of 3 to 18% by volume and a temperature of 300 to 6
A method for treating a carbon fiber reinforced plastic, which comprises treating the resin in a gas atmosphere within a range of 00 ° C. without burning it and thermally decomposing the plastic to recover carbon fibers. 【請求項３】炭素繊維強化プラスチックを、酸素濃度が
３〜１８体積％の範囲内で、温度が３００〜６００℃の
範囲内のガス雰囲気下で燃焼させないで処理し、プラス
チックを熱分解して炭素繊維を回収することを特徴とす
る、炭素繊維強化プラスチックから炭素繊維を回収する
方法。3. A carbon fiber reinforced plastic is treated without burning in a gas atmosphere having an oxygen concentration of 3 to 18% by volume and a temperature of 300 to 600 ° C. to thermally decompose the plastic. A method for recovering carbon fiber from carbon fiber reinforced plastic, which comprises recovering carbon fiber.
JP25144592A 1992-09-21 1992-09-21 Processing method of carbon fiber reinforced plastic Expired - Lifetime JP3180463B2 (en)

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