JPH0938973A - Recovery of support from magnetic recording material - Google Patents
Recovery of support from magnetic recording materialInfo
- Publication number
- JPH0938973A JPH0938973A JP19670595A JP19670595A JPH0938973A JP H0938973 A JPH0938973 A JP H0938973A JP 19670595 A JP19670595 A JP 19670595A JP 19670595 A JP19670595 A JP 19670595A JP H0938973 A JPH0938973 A JP H0938973A
- Authority
- JP
- Japan
- Prior art keywords
- support
- recording material
- magnetic recording
- alkali metal
- magnetic
- 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.)
- Pending
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 64
- 239000000463 material Substances 0.000 title claims abstract description 29
- 238000011084 recovery Methods 0.000 title 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 claims abstract description 20
- 229920005989 resin Polymers 0.000 claims abstract description 18
- 239000011347 resin Substances 0.000 claims abstract description 18
- 239000011230 binding agent Substances 0.000 claims abstract description 15
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 10
- 239000006247 magnetic powder Substances 0.000 claims abstract description 7
- 238000005406 washing Methods 0.000 claims abstract description 6
- 239000007864 aqueous solution Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 229920006230 thermoplastic polyester resin Polymers 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- -1 polyethylene terephthalate Polymers 0.000 description 15
- 229920000139 polyethylene terephthalate Polymers 0.000 description 14
- 239000005020 polyethylene terephthalate Substances 0.000 description 14
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 239000004115 Sodium Silicate Substances 0.000 description 7
- 235000019795 sodium metasilicate Nutrition 0.000 description 7
- 229910052911 sodium silicate Inorganic materials 0.000 description 7
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 5
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 4
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- JGFBRKRYDCGYKD-UHFFFAOYSA-N dibutyl(oxo)tin Chemical compound CCCC[Sn](=O)CCCC JGFBRKRYDCGYKD-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 150000001340 alkali metals Chemical class 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- BMRWNKZVCUKKSR-UHFFFAOYSA-N butane-1,2-diol Chemical compound CCC(O)CO BMRWNKZVCUKKSR-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000010907 mechanical stirring Methods 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- ZJQPLBFKBQYYIO-UHFFFAOYSA-N dodecasodium;trisilicate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] ZJQPLBFKBQYYIO-UHFFFAOYSA-N 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 159000000001 potassium salts Chemical class 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- POWFTOSLLWLEBN-UHFFFAOYSA-N tetrasodium;silicate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-][Si]([O-])([O-])[O-] POWFTOSLLWLEBN-UHFFFAOYSA-N 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Processing Of Solid Wastes (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、熱可塑性樹脂から
なる支持体上に、磁性粉をバインダー樹脂とともに塗
布、加熱硬化して磁性層を形成してなる磁気テープ、磁
気ディスク等の磁気記録材料の製造工程で発生した廃棄
対象物または使用済みで不要となった磁気記録材料から
の支持体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 recording material such as a magnetic tape or a magnetic disk in which a magnetic layer is formed by coating a magnetic powder with a binder resin on a support made of a thermoplastic resin and heating and curing the magnetic powder. The present invention relates to a method for recovering a support from an object to be discarded generated in the manufacturing process or a magnetic recording material that has been used and is no longer needed.
【０００２】[0002]
【従来の技術】近年、情報記録産業は、著しい発展を遂
げつつあり、使用される磁気記録材料も急増しつつあ
る。それに伴い、磁気記録材料の製造工程で発生する廃
棄対象物（例えば、フロッピーディスクの打ち抜き残
部、ビデオあるいはオーディオテープの切断端部および
これらの製品検査過程で発生する品質不良品等）、ある
いは使用済みの不要品も多量になりつつある。これら
は、殆どが埋立てまたは焼却処分によっているのが実状
であるが、埋立てでは、これらが腐敗消滅することは望
めず、また焼却しても高い燃焼熱を発生することから、
環境保全上からも好ましくないものであった。2. Description of the Related Art In recent years, the information recording industry has been developing remarkably and the magnetic recording materials used are also rapidly increasing. Along with this, wastes that are generated in the manufacturing process of magnetic recording materials (for example, punched out remains of floppy disks, cut ends of video or audio tapes, and defective products that occur during the product inspection process), or used The number of unnecessary items is also increasing. Most of these are actually landfilled or incinerated, but in landfills, it cannot be expected that they will decay and disappear, and high heat of combustion is generated even when incinerated.
It was also unfavorable for environmental protection.
【０００３】かかる問題を解決するために、磁気記録材
料からの磁性膜および支持体の回収方法が種々提案され
ている。例えばポリエチレンテレフタレートに磁性材料
をバインダー樹脂とともに塗布してなる磁気記録材料
を、アルカリ金属水酸化物を含む水溶液もしくはグリコ
ール中で加熱等の方法により磁性層を剥離する方法（特
開昭５３−７０４０４号公報、同５３−１１２９７９号
公報、同５４−６６９８５号公報、同５９−１６２９８
６号公報、同６３−２０１０１８号公報、特開平６−２
３８６６６号公報、特公昭６０−２３１３４号公報、同
６１−１４６６号公報、特公平１−３２２９５号公報、
同４−４２８０３号公報等）。またピロリドン液または
γ−ブチロラクトン液と接触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も提案されている
（特開平６−１８０８４２号公報）。In order to solve such a problem, various methods for recovering a magnetic film and a support from a magnetic recording material have been proposed. For example, a magnetic recording material prepared by coating a magnetic material on polyethylene terephthalate together with a binder resin is peeled off the magnetic layer by a method such as heating in an aqueous solution containing an alkali metal hydroxide or glycol (JP-A-53-70404). JP-A-53-112979, JP-A-54-66985 and JP-A-59-16298.
No. 6, JP-A-63-201018, JP-A-6-2
No. 38666, No. 60-23134, No. 61-1466, No. 1-32295.
4-42803, etc.). There is also proposed a method for recovering a magnetic film from a magnetic recording medium, which is characterized in that it is brought into contact with a pyrrolidone solution or a γ-butyrolactone solution (JP-A-6-180842).
【０００４】たしかに、アルカリ金属水酸化物の水溶液
中で磁気記録材料から磁性層を剥離する方法は有効な手
段ではあるものの、磁気記録材料をアルカリ金属水酸化
物の水溶液と接触させた際に、支持体がアルカリ金属水
酸化物により侵食されたり、残存アルカリ種による支持
体の変色が起こる問題があり、回収された支持体を再利
用する場合に好ましくない結果を生ずる。Although the method of peeling the magnetic layer from the magnetic recording material in an aqueous solution of an alkali metal hydroxide is an effective means, it can be said that when the magnetic recording material is brought into contact with the aqueous solution of an alkali metal hydroxide, There is a problem that the support is eroded by the alkali metal hydroxide and discoloration of the support is caused by the residual alkali species, which causes unfavorable results when the recovered support is reused.
【０００５】一方、ピロリドンまたはγ−ブチロラクト
ンのような溶媒は、磁性層を支持体から剥離するには、
有効な溶媒ではあるものの、バインダー樹脂の種類によ
っては、バインダー樹脂がこれらの溶媒に溶解するため
に、剥離後の支持体表面にバインダー樹脂の薄膜が残
り、回収した支持体を再利用する際に、好ましくない影
響を与える問題がある。バインダー樹脂を完全に除去す
るために、これらの溶媒を多量に使用することによっ
て、除去は可能であるものの、これらの溶媒が比較的高
価でかつ高沸点であることを勘案すると必ずしも経済的
な方策ではない。On the other hand, a solvent such as pyrrolidone or γ-butyrolactone is used for peeling the magnetic layer from the support.
Although it is an effective solvent, depending on the type of binder resin, the binder resin dissolves in these solvents, so a thin film of binder resin remains on the surface of the support after peeling, and when the recovered support is reused. , There is a problem that has an unfavorable effect. Although it is possible to remove the binder resin by using a large amount of these solvents in order to completely remove the binder resin, it is not always an economic measure considering that these solvents are relatively expensive and have a high boiling point. is not.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、環境保全、
資源の再利用さらには廉価な処理方法の見地からなされ
たものであって、磁気記録材料から磁性層を簡便かつ廉
価に剥離して、支持体の熱可塑性樹脂の回収と再利用を
行うことを目的とする。SUMMARY OF THE INVENTION The present invention is directed to environmental conservation,
It was made from the viewpoint of resource reuse and an inexpensive treatment method, and it is possible to easily and inexpensively peel the magnetic layer from the magnetic recording material to recover and reuse the thermoplastic resin of the support. To aim.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、上記の課
題に鑑み、鋭意検討した結果、磁気記録材料をアルカリ
金属のケイ酸塩水溶液と接触させることにより、磁性層
を熱可塑性樹脂からなる支持体から容易に剥離させるこ
と、さらに支持体を痛めることなく回収することが可能
であることを見い出し、本発明を完成するに至った。即
ち、本発明は、熱可塑性樹脂からなる支持体上に、磁性
粉をバインダー樹脂とともに塗布して、磁性層を形成し
てなる磁気記録材料を、アルカリ金属のケイ酸塩水溶液
と接触させることにより、磁性層を剥離し、次いで水洗
することを特徴とする磁気記録材料からの支持体の回収
方法に関する。DISCLOSURE OF THE INVENTION As a result of intensive studies in view of the above problems, the present inventors have made a magnetic layer from a thermoplastic resin by bringing a magnetic recording material into contact with an alkali metal silicate aqueous solution. The present invention has been completed by finding that it can be easily peeled off from the other support and can be recovered without damaging the support. That is, according to the present invention, magnetic powder is applied together with a binder resin on a support made of a thermoplastic resin, and a magnetic recording material formed by forming a magnetic layer is brought into contact with an alkali metal silicate aqueous solution. The present invention relates to a method for recovering a support from a magnetic recording material, which comprises peeling off the magnetic layer and then washing with water.
【０００８】[0008]
【発明の実施の形態】以下、本発明を詳細に説明する。
磁気記録材料としてのフロッピーディスク、オーディオ
あるいはビデオテープ等は、通常、磁性粉、潤滑剤、導
電性付与剤等をバインダー樹脂中に微粒子状に分散させ
た溶媒溶液を、支持体である熱可塑性樹脂フィルム上に
塗布、加熱乾燥処理し、その後、所要サイズのディスク
状またはテープ状に打ち抜きまたは裁断することによ
り、製造されている。従って、加熱乾燥後の磁性層は、
支持体表面上に強固に接着されている。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
Floppy disks, audio or video tapes and the like as magnetic recording materials are usually prepared by dissolving a solvent solution in which a magnetic powder, a lubricant, a conductivity-imparting agent, etc. are finely dispersed in a binder resin, and a thermoplastic resin as a support. It is manufactured by coating on a film, heat-drying it, and then punching or cutting it into a disk or tape of the required size. Therefore, the magnetic layer after heating and drying is
It is firmly adhered to the surface of the support.
【０００９】上記支持体としては、ポリエチレンテレフ
タレート、ポリエチレンナフタレート等の熱可塑性ポリ
エステル樹脂が主に使用されている。As the support, a thermoplastic polyester resin such as polyethylene terephthalate or polyethylene naphthalate is mainly used.
【００１０】磁性粉としては、Ｆｅ2Ｏ3，γ−Ｆｅ
2Ｏ3，ＣｒＯ2，Ｃｏ−γ−Ｆｅ2Ｏ3 ，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体粉末
である。Magnetic powders include Fe 2 O 3 and γ-Fe.
It is a ferromagnetic powder such as 2 O 3 , CrO 2 , Co-γ-Fe 2 O 3 , iron, barium ferrite and strontium ferrite.
【００１１】バインダー樹脂としては、通常、熱硬化型
のポリウレタン樹脂、エポキシ樹脂、セルロース系樹
脂、ビニル樹脂およびこれらの樹脂の混合物等が使用さ
れる。As the binder resin, a thermosetting polyurethane resin, an epoxy resin, a cellulosic resin, a vinyl resin and a mixture of these resins are usually used.
【００１２】本発明の磁気記録材料としては、これらの
ディスクまたはテープの製造工程で発生する廃棄対象物
のみならず、使用済みの不要品をも対象とする。As the magnetic recording material of the present invention, not only the object to be discarded generated in the manufacturing process of these disks or tapes, but also the used unnecessary products are targeted.
【００１３】上記製造工程で発生する廃棄対象物または
使用済みの不要となった磁気記録材料の磁性層と支持体
の剥離は、これら磁気記録材料をアルカリ金属のケイ酸
塩水溶液に接触させることによって行われるが、磁性層
を支持体より迅速に剥離するには、磁気記録材料の磁性
層表面がアルカリ金属のケイ酸塩水溶液に絶えず接触し
ているとともに、剥離した磁性層が早期に流去される状
態にあることが好ましい。そのためには、機械撹拌法、
超音波洗浄法、ガス吹き込み法、揺動法等の方法によ
り、系を流動させることが好ましい。他の方法として、
高圧スプレー法も本発明では有用である。The separation of the support from the magnetic layer of the waste material or the used magnetic recording material which has become unnecessary in the above manufacturing process is carried out by bringing the magnetic recording material into contact with an aqueous silicate solution of an alkali metal. However, in order to remove the magnetic layer from the support more quickly, the surface of the magnetic layer of the magnetic recording material is constantly in contact with the aqueous solution of alkali metal silicate, and the separated magnetic layer is washed away early. It is preferable to be in a state where For that, mechanical stirring method,
The system is preferably fluidized by a method such as an ultrasonic cleaning method, a gas blowing method, a rocking method or the like. Alternatively,
The high pressure spray method is also useful in the present invention.
【００１４】本発明で使用されるアルカリ金属のケイ酸
塩としては、リチウム、ナトリウム、カリウム等のアル
カリ金属のケイ酸塩であり、例えばオルトケイ酸ナトリ
ウム、メタケイ酸ナトリウム、メタ二ケイ酸ナトリウ
ム、メタ三ケイ酸ナトリウム、メタ四ケイ酸ナトリウム
およびこれらのリチウム塩またはカリウム塩である。そ
の他、水ガラスと呼ばれ、一般式Ｎａ2Ｏ・ｎＳｉＯ2・
ｎＨ2Ｏ(ｎ＝２〜４）で示される液状のケイ酸ナトリウ
ムガラスも入手性、経済性の面から好ましく使用され
る。アルカリ金属のケイ酸塩水溶液中のアルカリ金属の
ケイ酸塩の濃度としては、使用するアルカリ金属のケイ
酸塩の種類、磁気記録材料との接触温度、接触時間およ
びバインダー樹脂の種類によって異なるため、一概に規
定できないが、１〜３０重量％、好ましくは２〜２０重
量％である。アルカリ金属のケイ酸塩の濃度が１重量％
未満では、磁性層の剥離に長時間を要するばかりでな
く、剥離した磁性層が微粉末化し、洗浄分離が容易でな
くなる。一方、３０重量％を超える濃度では、剥離は速
いものの、アルカリ金属のケイ酸塩を除去するのに、多
量の水を要し好ましくない。The alkali metal silicate used in the present invention is an alkali metal silicate such as lithium, sodium or potassium. For example, sodium orthosilicate, sodium metasilicate, sodium metadisilicate, meta. Sodium trisilicate, sodium metatetrasilicate and their lithium or potassium salts. In addition, it is called water glass and has the general formula Na 2 O · nSiO 2 ·
Liquid sodium silicate glass represented by nH 2 O (n = 2 to 4) is also preferably used in terms of availability and economy. The concentration of the alkali metal silicate in the alkali metal silicate aqueous solution depends on the type of the alkali metal silicate used, the contact temperature with the magnetic recording material, the contact time, and the type of the binder resin. Although it cannot be specified unconditionally, it is 1 to 30% by weight, preferably 2 to 20% by weight. Concentration of alkali metal silicate is 1% by weight
If it is less than 1, not only it takes a long time to peel off the magnetic layer, but also the peeled magnetic layer becomes fine powder, which makes cleaning and separation difficult. On the other hand, if the concentration exceeds 30% by weight, the peeling is fast, but a large amount of water is required to remove the alkali metal silicate, which is not preferable.
【００１５】本発明で使用されるアルカリ金属のケイ酸
塩の水溶液の温度は、アルカリ金属種、その水溶液の濃
度およびバインダー樹脂によっても異なることから、一
概に規定はできないが、２０〜１００℃、好ましくは４
０〜１００℃である。温度が２０℃未満では、磁性層と
支持体を剥離するのに長時間を要するため、実用的でな
い。The temperature of the aqueous solution of the alkali metal silicate used in the present invention varies depending on the alkali metal species, the concentration of the aqueous solution and the binder resin, and therefore cannot be specified unconditionally, but 20 to 100 ° C. Preferably 4
0-100 ° C. If the temperature is lower than 20 ° C., it takes a long time to separate the magnetic layer from the support, which is not practical.
【００１６】またバインダー樹脂の種類によっては、ア
ルカリ金属のケイ酸塩の水溶液が磁性層に浸透しにく
く、剥離しにくい場合があるが、その場合には、アルカ
リ金属のケイ酸塩の水溶液の磁性層への浸透を補助する
ことを目的として、水溶性アルコールを、本発明の効果
を妨げぬ範囲で併用しても良い。Further, depending on the kind of the binder resin, the aqueous solution of alkali metal silicate may not easily penetrate into the magnetic layer and may be difficult to be peeled off. A water-soluble alcohol may be used together within the range not impairing the effects of the present invention for the purpose of assisting penetration into the layer.
【００１７】使用するアルコールとしては、メタノー
ル、エタノール、プロパノール、イソプロパノール等で
あり、その使用量は、０〜５０容量％、好ましくは０〜
３０容量％である。The alcohol used is methanol, ethanol, propanol, isopropanol or the like, and the amount used is 0 to 50% by volume, preferably 0 to
30% by volume.
【００１８】アルカリ金属のケイ酸塩の水溶液との接触
時間は、アルカリ金属種、その水溶液の濃度あるいは温
度によっても異なるが、１分〜５時間、好ましくは５分
〜３時間である。接触時間が１分未満では、剥離が不十
分である。一方、５時間を超えるような条件は実用的で
ない。The contact time of the alkali metal silicate with the aqueous solution is 1 minute to 5 hours, preferably 5 minutes to 3 hours, depending on the alkali metal species, the concentration of the aqueous solution or the temperature. If the contact time is less than 1 minute, peeling is insufficient. On the other hand, conditions that exceed 5 hours are not practical.
【００１９】本発明では、磁気記録材料は、アルカリ金
属のケイ酸塩水溶液と接触させることで殆ど完全に剥離
しており、水洗は、付着の磁性層と支持体表面のアルカ
リを除去するのみであるが、自然剥離がしにくい場合で
も、支持体上の残存部分を、ナイロンブラシ等で軽く擦
る程度で容易に剥離除去することが可能である。In the present invention, the magnetic recording material is almost completely peeled off by bringing it into contact with an alkali metal silicate aqueous solution, and washing with water only removes the adhered magnetic layer and the alkali on the surface of the support. However, even if spontaneous peeling is difficult, the remaining portion on the support can be easily peeled and removed by lightly rubbing with a nylon brush or the like.
【００２０】[0020]
【実施例】以下、実施例により、本発明の実施態様並び
に効果を具体的に説明する。The embodiments and effects of the present invention will be specifically described below with reference to examples.
【００２１】実施例１ 撹拌機、温度調節器を付した２．５リットルの平底フラ
スコからなる剥離装置に、５重量％のメタケイ酸ナトリ
ウム（９水和物）を溶解した２リットルの水溶液を入
れ、Ａ社の３．５インチのフロッピーディスクの裁断片
２００ｇを浸漬し、撹拌しながら、８０℃で１時間加熱
したところ、磁性層は完全に剥離した。磁性層が剥離さ
れた支持体を分取した後、３リットルの水で３回水洗
し、残存するアルカリを除去した。その後１２０℃で８
時間乾燥することにより、１８８ｇのポリエチレンテレ
フタレートを回収した。この操作を１０回繰り返すこと
により、所定の量を確保した。撹拌装置、窒素ガス導入
管、冷却管、温度計を付した３リットルの四ツ口フラス
コからなる反応装置に、回収されたポリエチレンテレフ
タレート１１５２ｇ(６モル）、解重合触媒としてのジ
ブチル錫オキサイド１０．４ｇ（０．０４２モル）、
１，２−ブタンジオール４５０ｇ（５モル）を仕込み、
内温２１０℃で４時間解重合することにより、常温で固
体の末端ヒドロキシ基を有するポリエチレンテレフタレ
ート解重合物を得た。この解重合物の１４０℃でのハー
ゼン色数は１００であった。Example 1 2 liters of an aqueous solution in which 5% by weight of sodium metasilicate (9 hydrate) was dissolved was placed in a peeling device consisting of a 2.5 liter flat bottom flask equipped with a stirrer and a temperature controller. 200 g of a 3.5 inch floppy disk of Company A was dipped and heated at 80 ° C. for 1 hour with stirring, and the magnetic layer was completely peeled off. The support from which the magnetic layer was peeled was separated and washed with 3 liters of water three times to remove residual alkali. Then at 120 ℃ 8
By drying for an hour, 188 g of polyethylene terephthalate was recovered. A predetermined amount was secured by repeating this operation 10 times. 11.2152 g (6 moles) of recovered polyethylene terephthalate and dibutyltin oxide as a depolymerization catalyst were placed in a reactor consisting of a 3 liter four-necked flask equipped with a stirrer, a nitrogen gas introduction tube, a cooling tube, and a thermometer. 4 g (0.042 mol),
1,2-butanediol 450 g (5 mol) was charged,
By depolymerizing at an internal temperature of 210 ° C. for 4 hours, a polyethylene terephthalate depolymerized product having a terminal hydroxy group that was solid at room temperature was obtained. The Hazen color number at 140 ° C. of this depolymerized product was 100.
【００２２】比較例１ ５重量％のメタケイ酸ナトリウム（９水和物）に代え
て、５重量％の水酸化ナトリウム水溶液を使用した以外
は、実施例１と同一条件で磁性層の剥離、水洗、乾燥処
理を行い、回収ポリエチレンテレフタレートを得た。こ
の処理により得られたポリエチレンテレフタレート１１
５２ｇ（６モル）を用い、実施例１と同様の反応装置
に、ジブチル錫オキサイド触媒１０．４ｇの存在下で、
１，２−ブタンジオール４５０ｇ（５モル）で２１０℃
で４時間解重合して、末端ヒドロキシ基を有するポリエ
チレンテレフタレート解重合物を得た。この解重合物の
１４０℃でのハーゼン色数は１５０であり、メタケイ酸
ナトリウム（９水和物）を使用した場合に比べ、着色が
著しかった。Comparative Example 1 The magnetic layer was peeled and washed under the same conditions as in Example 1 except that 5% by weight of sodium metasilicate (9 hydrate) was replaced with 5% by weight of an aqueous sodium hydroxide solution. Then, a drying treatment was performed to obtain a recovered polyethylene terephthalate. Polyethylene terephthalate 11 obtained by this treatment
Using 52 g (6 mol), in the same reactor as in Example 1 in the presence of 10.4 g of dibutyltin oxide catalyst,
1,2-butanediol 450 g (5 mol) at 210 ° C
Was depolymerized for 4 hours to obtain a polyethylene terephthalate depolymerized product having a terminal hydroxy group. The Hazen color number at 140 ° C. of this depolymerized product was 150, and the coloring was remarkable as compared with the case where sodium metasilicate (9 hydrate) was used.
【００２３】実施例２ タービン翼を持つ撹拌装置、温度調節器付の投げ込み型
加熱ヒーターを付した８０リットルのステンレス製容器
からなる剥離装置に、水ガラスを１０重量％溶解した水
溶液５０リットルを入れ、８０℃に加熱撹拌した。この
容器にＡ社の５インチフロッピーディスクの打ち抜き残
部の裁断片６kgを仕込み、この温度を保持しながら、１
時間撹拌して磁性層を剥離した。磁性層を剥離した支持
体を分取後、４０リットルの水で３回洗浄し、１２０℃
で一夜真空乾燥することにより、５．６kgのポリエチレ
ンテレフタレートを回収した。この回収ポリエチレンテ
レフタレート１１５２ｇ（６モル）を用い、ジブチル錫
オキサイド触媒１０．４ｇ、プロピレングリコール９１
２ｇ（１２モル）を実施例１と同じ反応装置に仕込み、
２１０℃で４時間解重合して、ハーゼン色数８０の常温
で液状の末端ヒドロキシ基を有する解重合物を得た。Example 2 50 liters of an aqueous solution in which 10% by weight of water glass was dissolved was placed in a stripping device consisting of an 80 liter stainless container equipped with a stirring device having turbine blades and a throw-in type heater with a temperature controller. The mixture was heated and stirred at 80 ° C. Into this container was charged 6 kg of the cut blank of the 5-inch floppy disk of Company A, and while maintaining this temperature, 1
The magnetic layer was peeled off by stirring for a time. After separating the support from which the magnetic layer has been peeled off, the support is washed 3 times with 40 liters of water, and the temperature is 120 ° C.
5.6 kg of polyethylene terephthalate was recovered by vacuum drying overnight. Using 1152 g (6 mol) of this recovered polyethylene terephthalate, 10.4 g of dibutyltin oxide catalyst and 91 propylene glycol were used.
2 g (12 mol) was charged into the same reactor as in Example 1,
Depolymerization was performed at 210 ° C. for 4 hours to obtain a depolymerized product having a Hazen color number of 80 and having a liquid terminal hydroxy group at room temperature.
【００２４】比較例２ 実施例２で使用した剥離装置に、２．５重量％の水酸化
ナトリウム水溶液５０リットルを入れ、８０℃に加熱し
た後、Ａ社の５インチフロッピーディスクの打ち抜き残
部の裁断片６kgを仕込み、この温度を保持しながら１時
間撹拌して磁性層を剥離した。その後、実施例２と同様
に後処理して５．６kgの回収ポリエチレンテレフタレー
トを得た。この回収ポリエチレンテレフタレート１１５
２ｇ（６モル）を用い、ジブチル錫オキサイド触媒１
０．４ｇ、プロピレングリコール９１２ｇ（１２モル）
を実施例１と同じ反応装置に仕込み、２１０℃で４時間
解重合して、常温で液状の末端ヒドロキシ基を有する解
重合物を得た。この解重合物のハーゼン色数は１２０で
あり、実施例２の解重合物に比し、着色が著しかった。Comparative Example 2 50 liters of a 2.5 wt% sodium hydroxide aqueous solution was placed in the stripping apparatus used in Example 2, heated to 80 ° C., and the punching remainder of the 5-inch floppy disk of Company A was cut. A piece of 6 kg was charged, and the magnetic layer was peeled off by stirring for 1 hour while maintaining this temperature. Then, post-treatment was carried out in the same manner as in Example 2 to obtain 5.6 kg of recovered polyethylene terephthalate. This recovered polyethylene terephthalate 115
Using 2 g (6 mol) of dibutyltin oxide catalyst 1
0.4 g, propylene glycol 912 g (12 mol)
Was charged in the same reactor as in Example 1 and depolymerized at 210 ° C. for 4 hours to obtain a depolymerized product having a terminal hydroxy group which was liquid at room temperature. This depolymerized product had a Hazen color number of 120, and was markedly colored as compared with the depolymerized product of Example 2.
【００２５】実施例３〜１１ 実施例１で使用した剥離装置に、所定濃度のメタケイ酸
ナトリウム（９水和物）を溶解した２リットルの水溶液
を入れ、Ａ〜Ｇ社の各種磁気記録材料の裁断片２００ｇ
を浸漬し、所定温度に加熱撹拌しながら磁気記録材料の
剥離に要する時間および水洗後の得られた支持体の表面
状態を観察した。なお実施例４では、機械撹拌に代え
て、フラスコ底部に設けた多数のガス吹き出し口を有す
る円形のノズルより空気を吹き出させて、系を流動させ
た。処理条件および観察の結果を表１に示す。Examples 3 to 11 The stripping apparatus used in Example 1 was charged with 2 liters of an aqueous solution in which sodium metasilicate (9 hydrate) having a predetermined concentration was dissolved. Cutting piece 200g
Was dipped, and the time required for peeling the magnetic recording material and the surface condition of the obtained support after washing with water were observed while heating and stirring at a predetermined temperature. In Example 4, instead of mechanical stirring, air was blown out from a circular nozzle having a large number of gas outlets provided at the bottom of the flask to flow the system. Table 1 shows the treatment conditions and the results of the observation.
【００２６】実施例１２ 実施例１で使用した剥離装置に、メタノール１０容量
％、水９０容量％からなる混合液に、メタケイ酸ナトリ
ウム（９水和物）１０重量％を溶解した溶液を入れ、６
０〜６５℃で２時間、Ａ社の３．５インチフロッピーデ
ィスクの裁断片２００ｇを処理し、磁性層の剥離の様子
および水洗後の支持体の表面状態を観察した。その結果
を表１に示す。Example 12 The stripping apparatus used in Example 1 was charged with a solution prepared by dissolving 10% by weight of sodium metasilicate (9 hydrate) in a mixed solution of 10% by volume of methanol and 90% by volume of water. 6
200 g of a 3.5 inch floppy disk manufactured by Company A was treated at 0 to 65 ° C. for 2 hours, and the state of peeling of the magnetic layer and the surface condition of the support after washing with water were observed. Table 1 shows the results.
【００２７】比較例３ 実施例１で使用した剥離装置に、メタノール６０容量
％、水４０容量％からなる混合液に３０重量％となるよ
うにメタケイ酸ナトリウム（９水和物）を溶解した溶液
を入れ、３０℃で０．５時間、Ａ社の３．５インチフロ
ッピーディスクの裁断片２００ｇを処理し、磁性層の剥
離、水洗、乾燥処理を行い、回収ポリエチレンテレフタ
レートを得た。この処理により得られたポリエチレンテ
レフタレートの表面状態の観察結果を表１に示す。Comparative Example 3 In the stripping apparatus used in Example 1, a solution prepared by dissolving sodium metasilicate (9 hydrate) in a mixed solution consisting of 60% by volume of methanol and 40% by volume of water in an amount of 30% by weight. Then, 200 g of a 3.5 inch floppy disk manufactured by Company A was treated for 0.5 hours at 30 ° C., the magnetic layer was peeled off, washed with water and dried to obtain a recovered polyethylene terephthalate. Table 1 shows the observation results of the surface state of polyethylene terephthalate obtained by this treatment.
【００２８】[0028]
【表１】 [Table 1]
【００２９】[0029]
【発明の効果】本発明により、磁気記録材料からの熱可
塑性樹脂からなる支持体を簡便かつ支持体を痛めること
なく回収することができる。According to the present invention, a support made of a thermoplastic resin from a magnetic recording material can be easily collected without damaging the support.
Claims (5)
粉をバインダー樹脂とともに塗布して、磁性層を形成し
てなる磁気記録材料を、アルカリ金属のケイ酸塩水溶液
と接触させることにより、磁性層を剥離し、次いで水洗
することを特徴とする磁気記録材料からの支持体の回収
方法。1. A magnetic recording material obtained by applying magnetic powder together with a binder resin onto a support made of a thermoplastic resin to bring a magnetic recording material into contact with an alkali metal silicate aqueous solution, A method for recovering a support from a magnetic recording material, which comprises peeling off a magnetic layer and then washing with water.
ステル樹脂である請求項１に記載の方法。2. The method according to claim 1, wherein the support of the magnetic recording material is a thermoplastic polyester resin.
性アルコールを０〜５０容量％含有する請求項１に記載
の方法。3. The method according to claim 1, wherein the aqueous solution of alkali metal silicate contains 0 to 50% by volume of a water-soluble alcohol.
カリ金属のケイ酸塩濃度が１〜３０重量％である請求項
１に記載の方法。4. The method according to claim 1, wherein the alkali metal silicate concentration in the alkali metal silicate aqueous solution is 1 to 30% by weight.
２０〜１００℃である請求項１に記載の方法。5. The method according to claim 1, wherein the temperature of the aqueous alkali metal silicate solution is 20 to 100 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19670595A JPH0938973A (en) | 1995-08-01 | 1995-08-01 | Recovery of support from magnetic recording material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19670595A JPH0938973A (en) | 1995-08-01 | 1995-08-01 | Recovery of support from magnetic recording material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0938973A true JPH0938973A (en) | 1997-02-10 |
Family
ID=16362224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19670595A Pending JPH0938973A (en) | 1995-08-01 | 1995-08-01 | Recovery of support from magnetic recording material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0938973A (en) |
-
1995
- 1995-08-01 JP JP19670595A patent/JPH0938973A/en active Pending
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