JP3225653B2 - Method for recovering magnetic film from magnetic recording medium - Google Patents

Method for recovering magnetic film from magnetic recording medium

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Publication number
JP3225653B2
JP3225653B2 JP33318292A JP33318292A JP3225653B2 JP 3225653 B2 JP3225653 B2 JP 3225653B2 JP 33318292 A JP33318292 A JP 33318292A JP 33318292 A JP33318292 A JP 33318292A JP 3225653 B2 JP3225653 B2 JP 3225653B2
Authority
JP
Japan
Prior art keywords
magnetic
recording medium
pyrrolidone
film
magnetic recording
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.)
Expired - Fee Related
Application number
JP33318292A
Other languages
Japanese (ja)
Other versions
JPH06180842A (en
Inventor
薫 亀山
義史 綾塚
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.)
Mitsubishi Chemical Engineering Corp
Original Assignee
Mitsubishi Chemical Engineering Corp
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 Mitsubishi Chemical Engineering Corp filed Critical Mitsubishi Chemical Engineering Corp
Priority to JP33318292A priority Critical patent/JP3225653B2/en
Publication of JPH06180842A publication Critical patent/JPH06180842A/en
Application granted granted Critical
Publication of JP3225653B2 publication Critical patent/JP3225653B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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
    • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
    • 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

Landscapes

  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明は、支持体上に磁性粉をバ
インダー樹脂と共に塗布して磁性膜を形成してなる磁気
記録媒体（録音テープ、ＶＴＲ用テープ、フロッピーデ
ィスク等）からの磁性膜の回収方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic film from a magnetic recording medium (recording tape, VTR tape, floppy disk, etc.) formed by applying a magnetic powder together with a binder resin on a support to form a magnetic film. The collection method of

【０００２】[0002]

【従来の技術】現在、磁気記録媒体として急成長してい
るフロッピーディスクを例に上げると、その製造工程に
於いて、実に多くのフロッピーディスク打抜き屑を出し
ている。このフロッピーディスク打抜き屑の処理方法と
しては、製造メーカーの殆どが、埋立て投棄しているの
が現状である。また、他の処理方法としては、フロッピ
ーディスク打抜き屑を焼却し、磁性粉を回収する方法が
考えられているが、設備コストがかかり工業的には採算
が合わないことが多い。2. Description of the Related Art At present, taking a floppy disk which is rapidly growing as a magnetic recording medium as an example, in the manufacturing process, a large number of floppy disk blanks are produced. At present, most of the manufacturers dispose of these floppy disk blanks in landfills. As another processing method, a method of incinerating a floppy disk punching waste and collecting a magnetic powder has been considered, but equipment cost is high and industrially is not profitable in many cases.

【０００３】[0003]

【発明が解決しようとする課題】そこで、本発明では、
環境保全（公害防止）、資源の再利用の見地から、例え
ば、上記ディスク打抜き屑から磁性膜を脱膜して、磁性
膜の磁性粉の再利用と支持体のプラスチックフィルムを
再資源化すること等を目的とする。Therefore, in the present invention,
From the viewpoint of environmental conservation (prevention of pollution) and resource reuse, for example, removing the magnetic film from the above-mentioned disc punching waste, reusing the magnetic powder of the magnetic film and recycling the plastic film of the support And so on.

【０００４】[0004]

【課題を解決するための手段】本発明者等は、上記の課
題に鑑み、鋭意検討した結果、上記のディスク等をピロ
リドン液、又はγ−ブチロラクトン液と、接触させるこ
とにより磁性膜が剥離して該ディスクから容易に脱膜で
きることを見出し、本発明を完成するに至った。即ち、
本発明は、支持体上に磁性粉をバインダー樹脂とともに
塗布して磁性膜を形成してなる磁気記録媒体をピロリド
ン液又はγ−ブチロラクトン液と接触させて、該磁気記
録媒体より磁性膜を剥離させることを特徴とする磁気記
録媒体からの磁性膜の回収方法に存する。Means for Solving the Problems In view of the above problems, the present inventors have made intensive studies and as a result, the magnetic film was peeled off by bringing the above disk or the like into contact with a pyrrolidone solution or a γ-butyrolactone solution. As a result, they found that the film could be easily removed from the disk, and completed the present invention. That is,
According to the present invention, a magnetic recording medium formed by applying a magnetic powder together with a binder resin on a support to form a magnetic film is brought into contact with a pyrrolidone solution or a γ-butyrolactone solution to peel off the magnetic film from the magnetic recording medium. A method for recovering a magnetic film from a magnetic recording medium, characterized in that:

【０００５】以下本発明を詳細に説明する。磁気記録媒
体である録音テープ、ＶＴＲ用テープ、フロッピーディ
スク等は、支持体であるプラスチックベースフィルム上
に、磁性粉をバインダー材によって強固に接着してい
る。上記支持体としてはプラスチック、特にポリエチレ
ンテレフタレート（ＰＥＴ）、ポリエチレンナフタレー
ト（ＰＥＮ）等のポリエステル系の熱可塑性樹脂を主体
とするフィルム、テーブ、ディスク形状のものが用いら
れる。磁性粉としてはＦｅ2 Ｏ3 ，γ−Ｆｅ2 Ｏ3 ，Ｃ
ｒＯ2 ，Ｃｏ−γＦｅ2 Ｏ3 ，鉄，バリウムフェライ
ト，ストロンチウムフェライト等の強磁性粉末があげら
れる。また、バインダー樹脂としては、通常、塗布型磁
気記録媒体に用いられているウレタン樹脂、エポキシ樹
脂、ビニル樹脂、セルロース樹脂等を使用することがで
きる。Hereinafter, the present invention will be described in detail. Recording tapes, VTR tapes, floppy disks, etc., which are magnetic recording media, have a magnetic powder firmly adhered to a plastic base film, which is a support, with a binder material. As the above-mentioned support, a film, a tape, and a disk-shaped material mainly composed of a polyester-based thermoplastic resin such as plastic, particularly polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) is used. Fe 2 O 3 , γ-Fe 2 O 3 , C
Examples include ferromagnetic powders such as rO 2 , Co-γFe 2 O 3 , iron, barium ferrite, and strontium ferrite. Further, as the binder resin, urethane resin, epoxy resin, vinyl resin, cellulose resin and the like which are usually used for a coating type magnetic recording medium can be used.

【０００６】本発明において磁気記録媒体は上記した磁
性粉、バインダー樹脂、及び必要に応じて研磨剤、潤滑
剤、導電性付与剤等をボールミル、サンドミル、三本ロ
ールミル等の分散機を用いて塗布溶剤に混合、分散して
塗料状の磁気組成物を得た後、かかる組成物をポリエチ
レンテレフタレートフィルム等の上記した支持体上に塗
布し、乾燥、加熱硬化処理して磁性膜を形成することに
より製造することができる。塗布溶剤としてはメチルエ
チルケトン、メチルイソブチルケトン、トルエン、シク
ロヘキサノン、テトラヒドラフラン等があげられる。In the present invention, the magnetic recording medium is coated with the above-mentioned magnetic powder, binder resin, and, if necessary, an abrasive, a lubricant, a conductivity-imparting agent, and the like using a dispersing machine such as a ball mill, a sand mill, or a three-roll mill. After mixing and dispersing in a solvent to obtain a paint-like magnetic composition, the composition is coated on the above-described support such as a polyethylene terephthalate film, and dried and heat-cured to form a magnetic film. Can be manufactured. Examples of the coating solvent include methyl ethyl ketone, methyl isobutyl ketone, toluene, cyclohexanone, and tetrahydrafuran.

【０００７】上記したフィルム状の磁気記録媒体は次い
で所望の形状、例えば、テープ状又はディスク状にカッ
テング又は打ち抜いた後、磁気記録媒体として使用され
る。本発明においては、上記したフィルム状の磁気記録
媒体のカッティング屑又は打抜き屑或いは所望形状の磁
気記録媒体の不良品（不合格品）又は使用済みのもの
（以下廃棄対象物という。）から磁性膜を脱膜し、ポリ
エチレンテレフタレート等の支持体と磁性膜とを分離し
回収するものである。[0007] The above-mentioned film-shaped magnetic recording medium is then cut or punched into a desired shape, for example, a tape or disk, and then used as a magnetic recording medium. In the present invention, the magnetic film is formed from the cutting or punching debris of the film-shaped magnetic recording medium or the defective (rejected) or used (hereinafter, referred to as a disposal target) magnetic recording medium having a desired shape. Is removed, and a support such as polyethylene terephthalate and a magnetic film are separated and collected.

【０００８】上記廃棄対象物からの磁性膜の脱膜は、該
廃棄対象物をピロリドン液又はγ−ブチロラクトン液に
接触させて行なう。接触法としては例えば、浸漬法、超
音波洗浄法、揺動法、スプレー法等の各種方法を採用し
て、廃棄対象物とピロリドン液又はγ−ブチロラクトン
液を通常１０〜１００℃、好ましくは２０〜８０℃の温
度で、通常１秒〜２時間、好ましくは５秒〜１時間、更
に好ましくは５秒〜１分間接触させて行なう。廃棄対象
物とピロリドン液又はγ−ブチロラクトン液との接触に
より廃棄対象物のポリエチレンテレフタレート等の支持
体層と磁性膜の界面にピロリドン液又はγ−ブチロラク
トン液が浸透してゆき、該磁性膜の塗膜が剥離され該支
持体から磁性膜が脱膜していく。また、自然剥離しにく
い場合でもナイロンブラシ等でフィルム状の廃棄対象物
を軽く擦る程度で容易に支持体から磁性膜が脱膜する。The removal of the magnetic film from the waste object is performed by bringing the waste object into contact with a pyrrolidone solution or a γ-butyrolactone solution. As the contact method, for example, various methods such as an immersion method, an ultrasonic cleaning method, an oscillating method, and a spray method are employed, and a waste object and a pyrrolidone solution or a γ-butyrolactone solution are usually used at 10 to 100 ° C., preferably 20 ° C. The contact is carried out at a temperature of about 80 ° C. for usually 1 second to 2 hours, preferably 5 seconds to 1 hour, more preferably 5 seconds to 1 minute. The contact between the waste object and the pyrrolidone solution or the γ-butyrolactone solution allows the pyrrolidone solution or the γ-butyrolactone solution to permeate the interface between the magnetic layer and the support layer such as polyethylene terephthalate of the waste object, and the coating of the magnetic film. The film is peeled off, and the magnetic film is removed from the support. In addition, even when it is difficult to spontaneously peel off, the magnetic film can be easily removed from the support by lightly rubbing the film-like waste object with a nylon brush or the like.

【０００９】また、本発明で用いるピロリドン液とはピ
ロリドン化合物を主成分とする液体である。ピロリドン
化合物としては２−ピロリドン、３−ピロリドン、Ｎ−
アルキル−２−ピロリドン（例えば、Ｎ−メチル−２−
ピロリドン、Ｎ−エチル−２−ピロリドン、Ｎ−プロピ
ル−２−ピロリドン）、５−アルキル−２−ピロリドン
（例えば、５−メチル−２−ピロリドン、５−エチル−
２−ピロリドン、５−プロピル−２−ピロリドン）、Ｎ
−ビニル−２−ピロリドン、Ｎ−アルキル−３−ピロリ
ドン（例えば、Ｎ−メチル−３−ピロリドン、Ｎ−エチ
ル−３−ピロリドン、Ｎ−プロピル−３−ピロリドン）
等が例示されるが、特にＮ−メチル−２−ピロリドンが
有効である。The pyrrolidone liquid used in the present invention is a liquid containing a pyrrolidone compound as a main component. As pyrrolidone compounds, 2-pyrrolidone, 3-pyrrolidone, N-
Alkyl-2-pyrrolidone (for example, N-methyl-2-
Pyrrolidone, N-ethyl-2-pyrrolidone, N-propyl-2-pyrrolidone), 5-alkyl-2-pyrrolidone (eg, 5-methyl-2-pyrrolidone, 5-ethyl-
2-pyrrolidone, 5-propyl-2-pyrrolidone), N
-Vinyl-2-pyrrolidone, N-alkyl-3-pyrrolidone (e.g., N-methyl-3-pyrrolidone, N-ethyl-3-pyrrolidone, N-propyl-3-pyrrolidone)
Although N-methyl-2-pyrrolidone is particularly effective.

【００１０】ピロリドン液、γ−ブチロラクトン液はピ
ロリドン化合物のみ又はγ−ブチロラクトンのみでもよ
いし、その他の成分として、ピロリドン化合物又はγ−
ブチロラクトンに対して相溶性のある水、またはアルコ
ール等の有機溶媒を、本発明の効果を損なわない範囲で
最大５０容量％程度まで、好ましくは３０容量％程度ま
で含めることができる。[0010] The pyrrolidone solution and γ-butyrolactone solution may be a pyrrolidone compound alone or γ-butyrolactone alone, and the other component may be a pyrrolidone compound or γ-butyrolactone.
Water or an organic solvent such as alcohol compatible with butyrolactone can be contained up to about 50% by volume, preferably up to about 30% by volume without impairing the effects of the present invention.

【００１１】[0011]

【実施例】以下、実施例により本発明の実施の態様なら
びにその効果を具体的に説明する。なお、以下、Ｎ−メ
チル−２−ピロリドンを「ＮＭＰ」、γ−ブチロラクト
ンを「ＧＢＬ」と略す。また、実施例中、「擦る」とあ
るのは、手にナイロンブラシを持って試料の表面を擦っ
たことを意味する。The embodiments of the present invention and the effects thereof will be specifically described below with reference to examples. Hereinafter, N-methyl-2-pyrrolidone is abbreviated as “NMP” and γ-butyrolactone is abbreviated as “GBL”. In the examples, “rubbing” means that the surface of the sample was rubbed with the nylon brush in hand.

【００１２】実施例１〜３及び比較例１〜３ Ａ社のフロッピーディスクの内部のフィルム部分を取り
出し、これを試料とし、表−１に示す各種溶剤中約３０
秒間浸漬し、磁性膜の剥離状況を観察した。Examples 1 to 3 and Comparative Examples 1 to 3 The film portion inside the floppy disk of Company A was taken out and used as a sample.
After immersion for 2 seconds, the state of peeling of the magnetic film was observed.

【００１３】[0013]

【表１】 [Table 1]

【００１４】実施例４ フロッピーディスクの代表的な製造メーカーを５社選
び、実施例１と同様にＮＭＰに約３０秒間浸漬する実験
を行った。結果を表−２に示す。表−２より、ＮＭＰ
は、その多くのメーカーが製造するフロッピーディスク
に効果を示すことがわかる。 実施例５ 実施例４において、ＮＭＰの代りにＧＢＬを用いたこと
以外は、同様にして行った。その結果を表−２に示す。Example 4 Five representative manufacturers of floppy disks were selected, and an experiment of immersion in NMP for about 30 seconds was performed in the same manner as in Example 1. Table 2 shows the results. From Table-2, NMP
Is effective for floppy disks manufactured by many manufacturers. Example 5 The same procedure was performed as in Example 4 except that GBL was used instead of NMP. Table 2 shows the results.

【００１５】[0015]

【表２】 [Table 2]

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平５−285953（ＪＰ，Ａ) 特開 昭53−92879（ＪＰ，Ａ) 特開 昭59−162986（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G11B 5/84 B09B 3/00 - 5/00 B29B 17/00 - 17/02 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-285953 (JP, A) JP-A-53-92879 (JP, A) JP-A-59-162986 (JP, A) (58) Investigation Field (Int.Cl. 7 , DB name) G11B 5/84 B09B 3/00-5/00 B29B 17/00-17/02

Claims (5)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 支持体上に磁性粉をバインダー樹脂とと
もに塗布して磁性膜を形成してなる磁気記録媒体をピロ
リドン液又はγ−ブチロラクトン液と接触させて、該磁
気記録媒体より磁性膜を剥離させることを特徴とする磁
気記録媒体からの磁性膜の回収方法。1. A magnetic recording medium formed by coating a support with a magnetic powder together with a binder resin to form a magnetic film is brought into contact with a pyrrolidone solution or a γ-butyrolactone solution to peel the magnetic film from the magnetic recording medium. A method for recovering a magnetic film from a magnetic recording medium. 【請求項２】 ピロリドン液又はγ−ブチロラクトン液
中に水が０〜５０容量％含有することを特徴とする請求
項１の方法。2. The method according to claim 1, wherein the pyrrolidone solution or the γ-butyrolactone solution contains 0 to 50% by volume of water. 【請求項３】 磁気記録媒体を浸漬することによりピロ
リドン液又はγ−ブチロラクトン液と接触させることを
特徴とする請求項１の方法。3. The method according to claim 1, wherein the magnetic recording medium is brought into contact with a pyrrolidone solution or a γ-butyrolactone solution by immersion. 【請求項４】 磁気記録媒体の支持体がポリエステル系
の熱可塑性樹脂を主体とするものであることを特徴とす
る請求項１の方法。4. The method according to claim 1, wherein the support of the magnetic recording medium is mainly made of a polyester-based thermoplastic resin. 【請求項５】 ピロリドン液又はγ−ブチロラクトン液
と接触させたのち磁性膜が形成されている側の支持体表
面を擦ることを特徴とする請求項１の方法。5. The method according to claim 1, wherein after contact with a pyrrolidone solution or a γ-butyrolactone solution, the surface of the support on which the magnetic film is formed is rubbed.
JP33318292A 1992-12-14 1992-12-14 Method for recovering magnetic film from magnetic recording medium Expired - Fee Related JP3225653B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33318292A JP3225653B2 (en) 1992-12-14 1992-12-14 Method for recovering magnetic film from magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP33318292A JP3225653B2 (en) 1992-12-14 1992-12-14 Method for recovering magnetic film from magnetic recording medium

Publications (2)

Publication Number Publication Date
JPH06180842A JPH06180842A (en) 1994-06-28
JP3225653B2 true JP3225653B2 (en) 2001-11-05

Family

ID=18263224

Family Applications (1)

Application Number Title Priority Date Filing Date
JP33318292A Expired - Fee Related JP3225653B2 (en) 1992-12-14 1992-12-14 Method for recovering magnetic film from magnetic recording medium

Country Status (1)

Country Link
JP (1) JP3225653B2 (en)

Also Published As

Publication number Publication date
JPH06180842A (en) 1994-06-28

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