JP7392639B2 - 炭素繊維をリサイクルする方法 - Google Patents
炭素繊維をリサイクルする方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
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- 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
- B29B17/0206—Selectively separating reinforcements from matrix material by destroying the interface bound before disintegrating the matrix to particles or powder, e.g. from tires or belts
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/06—Elements
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- 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
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- 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
- B29B2017/0213—Specific separating techniques
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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Description
炭素繊維及び樹脂を含む炭素繊維強化樹脂を有する炭素繊維強化樹脂成形品を用意する工程、
炭素繊維強化樹脂成形品に加熱処理及び紫外線照射処理の少なくとも一方の処理を行う工程、及び
前記処理後の炭素繊維強化樹脂成形品の少なくとも炭素繊維に第一の液体を噴射し、前記処理後の樹脂を炭素繊維から除去する工程を含む、方法。
(2) 前記処理後の炭素繊維強化樹脂成形品の少なくとも一部を、第二の液体に浸漬させる工程を有し、
前記浸漬させる工程を、前記処理後の樹脂を炭素繊維から除去する工程の前及び同時の少なくとも一方で行う、(1)に記載の方法。
(3) 前記第一の液体を、炭素繊維強化樹脂成形品に対して噴射する、(1)又は(2)に記載の方法。
(4) 前記第一の液体を、炭素繊維強化樹脂成形品から引き出した炭素繊維に対して噴射する、(1)又は(2)に記載の方法。
(5) 前記第一の液体を噴射する際のノズル圧力が1MPa以上である、(1)~(4)のいずれか1つに記載の方法。
(6) 前記第一の液体が、酸性溶液、有機溶媒、過酸化水素水、及びイオン液体から選択される少なくとも1種の液体である、(1)~(5)のいずれか1つに記載の方法。
(7) 前記第二の液体が、酸性溶液、有機溶媒、過酸化水素水、及びイオン液体から選択される少なくとも1種の液体である、(2)に記載の方法。
(8) 前記有機溶媒が、脂肪族炭化水素系溶媒、芳香族炭化水素系溶媒、アルコール系溶媒、ケトン系溶媒、エーテル系溶媒、アミド系溶媒、及びエステル系溶媒から選択される少なくとも1種の有機溶媒である、(6)又は(7)に記載の方法。
(9) 前記第一の液体の温度が0~100℃である、(1)~(8)のいずれか1つに記載の方法。
(10) 前記第二の液体の温度が0~100℃である、(2)又は(7)に記載の方法。
(11) 前記加熱処理が、400℃以上の温度で炭素繊維強化樹脂成形品を加熱する処理である、(1)~(10)のいずれかに記載の方法。
(12) 前記加熱処理が、空気を遮断した状態で行われる、(1)~(11)のいずれか1つに記載の方法。
本実施形態に係るリサイクル方法は、炭素繊維及び樹脂を含む炭素繊維強化樹脂を有する炭素繊維強化樹脂成形品を用意する工程を含む。
本実施形態に係るリサイクル方法は、炭素繊維強化樹脂成形品に加熱処理及び紫外線照射処理の少なくとも一方の処理を行う工程を含む。
紫外線照射を行う際のUV照度(UV強度)としては、好ましくは50~1000mW/cm2であり、より好ましくは200~500mW/cm2である。また、UV露光量(積算光量)としては、好ましくは100~2,000mJ/cm2であり、より好ましくは500~1,000mJ/cm2である。前記範囲内では、樹脂の処理が速やかに進み、且つ炭素繊維の損傷を抑制することができる。
本実施形態に係るリサイクル方法は、前記処理後の炭素繊維強化樹脂成形品の少なくとも炭素繊維に第一の液体を噴射し、前記処理後の樹脂を炭素繊維から除去する工程を含む。
本実施形態に係るリサイクル方法は、前記処理後の炭素繊維強化樹脂成形品の少なくとも一部を、第二の液体に浸漬させる工程を含んでいてもよい。前記浸漬させる工程は、前記処理後の樹脂を炭素繊維から除去する工程、すなわち、除去工程の前及び同時の少なくとも一方で行うことが好ましい。すなわち、本実施形態に係るリサイクル方法が浸漬工程を含む場合には、成形品用意工程、処理工程、浸漬工程、除去工程の順に行われる方法であってもよく、成形品用意工程、処理工程、(浸漬工程+除去工程)の順に行われる方法であってもよく、成形品用意工程、処理工程、浸漬工程、(浸漬工程+除去工程)の順に行われる方法であってもよい。なお、(浸漬工程+除去工程)とは、浸漬工程と除去工程とを同時に行うことを意味する。
本実施形態に係るリサイクル方法は、炭素繊維強化樹脂成形品から炭素繊維を引き出す工程を含んでいてもよい。前記炭素繊維を引き出す工程は、任意のタイミングで行うことができ、例えば処理工程の後、除去工程や、浸漬工程の前に行ってもよく、浸漬工程の後、除去工程の前に行ってもよく、除去工程の後に行ってよい。
本実施形態に係るリサイクル方法は、除去工程により得られた樹脂が除去された炭素繊維にサイジング剤を付着させる工程を含んでいてもよい。
本実施形態に係るリサイクル方法は、除去工程により得られた樹脂が除去された炭素繊維を巻き取る工程を含んでいてもよい。炭素繊維を巻き取る工程は、除去工程の後に行うことが可能であり、サイジング剤付与工程を含む場合には、サイジング剤付与工程の後に行うことができる。
20 炭素繊維強化樹脂層
30 バルブ側口金
40 エンド側口金
50 バルブ
60 保護層
100 タンク
200 炭素繊維強化樹脂成形品
210 処理装置
220 処理後の炭素繊維強化樹脂成形品
230 第二の液体
240 ノズル
250 第一の液体
260 略水平軸
Claims (12)
- 炭素繊維をリサイクルする方法であって、
炭素繊維及び樹脂を含む炭素繊維強化樹脂を有する炭素繊維強化樹脂成形品を用意する工程、
炭素繊維強化樹脂成形品に加熱処理及び紫外線照射処理の少なくとも一方の処理を行う工程、及び
前記処理後の炭素繊維強化樹脂成形品の少なくとも炭素繊維に第一の液体を噴射し、前記処理後の樹脂を炭素繊維から除去する工程を含む、方法。 - 前記処理後の炭素繊維強化樹脂成形品の少なくとも一部を、第二の液体に浸漬させる工程を有し、
前記浸漬させる工程を、前記処理後の樹脂を炭素繊維から除去する工程の前及び同時の少なくとも一方で行う、請求項1に記載の方法。 - 前記第一の液体を、炭素繊維強化樹脂成形品に対して噴射する、請求項1又は2に記載の方法。
- 前記第一の液体を、炭素繊維強化樹脂成形品から引き出した炭素繊維に対して噴射する、請求項1又は2に記載の方法。
- 前記第一の液体を噴射する際のノズル圧力が1MPa以上である、請求項1~4のいずれか1項に記載の方法。
- 前記第一の液体が、酸性溶液、有機溶媒、過酸化水素水、及びイオン液体から選択される少なくとも1種の液体である、請求項1~5のいずれか1項に記載の方法。
- 前記第二の液体が、酸性溶液、有機溶媒、過酸化水素水、及びイオン液体から選択される少なくとも1種の液体である、請求項2に記載の方法。
- 前記有機溶媒が、脂肪族炭化水素系溶媒、芳香族炭化水素系溶媒、アルコール系溶媒、ケトン系溶媒、エーテル系溶媒、アミド系溶媒、及びエステル系溶媒から選択される少なくとも1種の有機溶媒である、請求項6又は7に記載の方法。
- 前記第一の液体の温度が0~100℃である、請求項1~8のいずれか1項に記載の方法。
- 前記第二の液体の温度が0~100℃である、請求項2又は7に記載の方法。
- 前記加熱処理が、400℃以上の温度で炭素繊維強化樹脂成形品を加熱する処理である、請求項1~10のいずれか1項に記載の方法。
- 前記加熱処理が、空気を遮断した状態で行われる、請求項1~11のいずれか1項に記載の方法。
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