JPH09235405A - Method for reusing polycarbonate resin molding - Google Patents
Method for reusing polycarbonate resin moldingInfo
- Publication number
- JPH09235405A JPH09235405A JP3955596A JP3955596A JPH09235405A JP H09235405 A JPH09235405 A JP H09235405A JP 3955596 A JP3955596 A JP 3955596A JP 3955596 A JP3955596 A JP 3955596A JP H09235405 A JPH09235405 A JP H09235405A
- Authority
- JP
- Japan
- Prior art keywords
- polycarbonate resin
- molecular weight
- reusing
- resin molded
- molded article
- 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
Links
- 229920005668 polycarbonate resin Polymers 0.000 title claims abstract description 90
- 239000004431 polycarbonate resin Substances 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000000465 moulding Methods 0.000 title abstract 6
- 239000000203 mixture Substances 0.000 abstract description 4
- 230000008929 regeneration Effects 0.000 abstract 1
- 238000011069 regeneration method Methods 0.000 abstract 1
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 16
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- -1 3,5-Dimethylphenyl Chemical group 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 229920000515 polycarbonate Polymers 0.000 description 4
- 239000004417 polycarbonate Substances 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000002243 precursor Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- VEORPZCZECFIRK-UHFFFAOYSA-N 3,3',5,5'-tetrabromobisphenol A Chemical compound C=1C(Br)=C(O)C(Br)=CC=1C(C)(C)C1=CC(Br)=C(O)C(Br)=C1 VEORPZCZECFIRK-UHFFFAOYSA-N 0.000 description 1
- YMTYZTXUZLQUSF-UHFFFAOYSA-N 3,3'-Dimethylbisphenol A Chemical compound C1=C(O)C(C)=CC(C(C)(C)C=2C=C(C)C(O)=CC=2)=C1 YMTYZTXUZLQUSF-UHFFFAOYSA-N 0.000 description 1
- VPWNQTHUCYMVMZ-UHFFFAOYSA-N 4,4'-sulfonyldiphenol Chemical compound C1=CC(O)=CC=C1S(=O)(=O)C1=CC=C(O)C=C1 VPWNQTHUCYMVMZ-UHFFFAOYSA-N 0.000 description 1
- 241000251468 Actinopterygii Species 0.000 description 1
- SDDLEVPIDBLVHC-UHFFFAOYSA-N Bisphenol Z Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)CCCCC1 SDDLEVPIDBLVHC-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical class OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 150000008062 acetophenones Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 150000001565 benzotriazoles Chemical class 0.000 description 1
- 239000006085 branching agent Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- ROORDVPLFPIABK-UHFFFAOYSA-N diphenyl carbonate Chemical compound C=1C=CC=CC=1OC(=O)OC1=CC=CC=C1 ROORDVPLFPIABK-UHFFFAOYSA-N 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000010169 landfilling Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- YGSDEFSMJLZEOE-UHFFFAOYSA-M salicylate Chemical compound OC1=CC=CC=C1C([O-])=O YGSDEFSMJLZEOE-UHFFFAOYSA-M 0.000 description 1
- 229960001860 salicylate Drugs 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 230000002087 whitening effect Effects 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
- Y02P20/143—Feedstock the feedstock being recycled material, e.g. plastics
-
- 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
Description
【０００１】[0001]
【発明の属する技術分野】本発明は長期間使用して分子
量が低下しているポリカーボネート樹脂成形品の再利用
方法に関する。更に詳しくは、分子量が低下しているポ
リカーボネート樹脂に新しいポリカーボネート樹脂を加
えて再溶融するポリカーボネート樹脂成形品の再利用方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reusing a polycarbonate resin molded product whose molecular weight has been reduced after long-term use. More specifically, the present invention relates to a method for reusing a polycarbonate resin molded article in which a new polycarbonate resin is added to a polycarbonate resin having a reduced molecular weight and remelted.
【０００２】[0002]
【従来の技術】ポリカーボネート樹脂は耐衝撃性や耐熱
性等に優れているがゆえに広い分野で多量使用されてい
る。例えば押出成形品ではシートとして道路の透光板、
遮音板、各種の窓ガラス、ヘルメットシールド等に、射
出成形品では養魚槽、水槽、電気器具のリレースース等
に、更にブロー成形品では飲料水の瓶、照明用グローブ
等に広く使用されている。しかしながら、長期間使用す
ると紫外線、水分、温度変化等の相互作用によってポリ
カーボネート樹脂成形品の分子量は経年とともに低下
し、同時に機械物性も低下して実用に供し得なくなり、
産業廃棄物として処分されることになる。特にシートの
場合、用途によっては同時に多量の廃棄物が発生するた
め、焼却や埋立て等により処分されており、環境汚染の
要因になりかねず、再利用の方法が切望されている。2. Description of the Related Art Polycarbonate resins are widely used in a wide variety of fields because of their excellent impact resistance and heat resistance. For example, in extruded products, as a sheet, a translucent plate for roads,
It is widely used in sound insulation plates, various window glasses, helmet shields, etc., in injection-molded products such as fish tanks, water tanks, and relaisose of electric appliances, and in blow-molded products widely in drinking water bottles, lighting gloves, etc. However, when used for a long period of time, the molecular weight of the polycarbonate resin molded article decreases with age due to the interaction of ultraviolet rays, moisture, temperature change, etc., and at the same time mechanical properties also deteriorate and it cannot be put to practical use,
It will be disposed of as industrial waste. Particularly, in the case of a sheet, a large amount of waste is generated at the same time depending on the application, and therefore it is disposed of by incineration, landfilling, or the like, which may cause environmental pollution, and a reusing method is desired.
【０００３】ポリカーボネート樹脂成形品の再利用方法
として、最近いくつかの方法が提案されている。ポリカ
ーボネートシートの劣化表面層を３００〜２０００kg／
cm2の高圧水を使用したウォータージェットにより剥離
除去し、この表面層を除去したポリカーボネートシート
を再利用する方法（特開平７−８０８３９号公報）、長
期間使用したポリカーボネートシート等の廃棄物の表面
を切削除去した後粉砕してポリカーボネート再生原料を
得、この再生原料を成形材料として利用する方法（特開
平７−２１４５５５号公報）等が提案されている。しか
しながら、これらの方法はいずれも表面層を取除くため
の大掛かりな設備や装置を必要とする問題があり、また
取除いた不良表面層の廃棄物を処理する点で環境汚染を
十分に改善するとはいい得ない。Several methods have recently been proposed as a method of reusing a polycarbonate resin molded article. Deteriorated surface layer of polycarbonate sheet 300-2000kg /
A method of peeling and removing by a water jet using cm 2 of high-pressure water, and reusing the polycarbonate sheet from which this surface layer has been removed (JP-A-7-80839), the surface of waste such as a polycarbonate sheet used for a long time A method (Japanese Patent Laid-Open No. 7-214555) has been proposed in which a polycarbonate regenerated raw material is obtained by cutting and removing the regenerated raw material, and the regenerated raw material is used as a molding material. However, each of these methods has a problem that large-scale equipment and devices are required for removing the surface layer, and if the waste of the removed defective surface layer is treated, it is considered that environmental pollution is sufficiently improved. Is not good.
【０００４】[0004]
【発明が解決しようとする課題】本発明の課題は、長期
間使用して分子量が低下しているポリカーボネート樹脂
成形品を、大掛かりな設備や装置を必要とせずに、再利
用することができる方法を提供することである。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for reusing a polycarbonate resin molded product whose molecular weight has been reduced for a long period of time without requiring large-scale equipment or equipment. Is to provide.
【０００５】本発明者は、使用済みのポリカーボネート
樹脂成形品の廃棄問題に長年取組み、成形品の屋外暴露
試験を実施し、経年的に観察、評価してきた。その結
果、ポリカーボネート樹脂成形品は分子量の低下と同時
に引張破断伸び、アイゾット衝撃強さが著しく低下して
実用に供し得なくなることを確認した。ポリカーボネー
ト樹脂から試験片（２mm×１２０mm×１５０mm）を射出
成形し、この試験片を屋外暴露架台に設置し、経年的に
測定し、その結果を表１に示した。使用したポリカーボ
ネート樹脂は、ビスフェノールＡとホスゲンから常法に
よって得た粘度平均分子量２３，２００のポリカーボネ
ート樹脂である。The inventor of the present invention has worked on the disposal problem of used polycarbonate resin molded products for many years, conducted outdoor exposure tests of the molded products, and observed and evaluated them over the years. As a result, it was confirmed that the polycarbonate resin molded product could not be put to practical use because its tensile breaking elongation and Izod impact strength were significantly decreased at the same time as the molecular weight was decreased. A test piece (2 mm x 120 mm x 150 mm) was injection-molded from a polycarbonate resin, and this test piece was placed on an outdoor exposure stand and measured over time, and the results are shown in Table 1. The polycarbonate resin used is a polycarbonate resin having a viscosity average molecular weight of 23,200 obtained from bisphenol A and phosgene by a conventional method.
【０００６】[0006]
【表１】 [Table 1]
【０００７】表より明らかなように、初年度の分子量
（粘度平均分子量）２３，２００に比べて１０年経過後
の分子量は１７，３００にまで低下し、物性値も引張破
断伸びで１４０％が１６％に低下し、アイゾッド衝撃強
さも厚さ３．２mmで８２０ kgf／cm2 が１０ kgf／cm2
にまで低下した。As is clear from the table, the molecular weight after 10 years has decreased to 17,300 as compared with the molecular weight (viscosity average molecular weight) of 23,200 in the first year, and the physical property value is 140% in terms of tensile elongation at break. 16%, and the Izod impact strength is 3.2 mm and 820 kgf / cm 2 is 10 kgf / cm 2
Down to.
【０００８】この屋外暴露１０年経過した試験片を粉砕
し、これにビスフェノールＡとホスゲンから常法によっ
て得た粘度平均分子量３０，０００の新しいポリカーボ
ネート樹脂粉粒体を混合し、溶融して粘度平均分子量２
３，２００に合せた試験片を射出成形し、物性を評価し
たところ初年度の物性値に近い値になった。即ち、屋外
暴露１０年経過し、分子量が低下しているポリカーボネ
ート樹脂に、分子量の高い新しいポリカーボネート樹脂
を加えて、分子量を暴露前の水準に戻せば、物性値も同
じ傾向を示すことを見出した。本発明はこの知見に基い
て完成したものである。This test piece after 10 years of outdoor exposure was crushed and mixed with a new polycarbonate resin powder having a viscosity average molecular weight of 30,000 obtained from bisphenol A and phosgene by a conventional method, and melted to obtain a viscosity average. Molecular weight 2
When a test piece conforming to 3,200 was injection-molded and its physical properties were evaluated, the physical properties were close to those in the first year. That is, it has been found that if a new polycarbonate resin having a high molecular weight is added to a polycarbonate resin having a reduced molecular weight after 10 years of outdoor exposure and the molecular weight is returned to the level before the exposure, the physical properties show the same tendency. . The present invention has been completed based on this finding.
【０００９】[0009]
【課題を解決するための手段】本発明は、分子量が低下
しているポリカーボネート樹脂成形品を再生して再利用
するに当り、再生ポリカーボネート樹脂より分子量が高
い別のポリカーボネート樹脂を下記式［１］ ０．８（Ａｘ＋Ｂｙ）／（ｘ＋ｙ）≦Ｍ≦１．２（Ａｘ＋Ｂｙ）／（ｘ＋ｙ） ……［１］ ［Ａは分子量が低下しているポリカーボネート樹脂成形
品の粘度平均分子量、Ｂは別のポリカーボネート樹脂の
粘度平均分子量、ｘは分子量が低下しているポリカーボ
ネート樹脂成形品の使用量（重量部）、ｙは別のポリカ
ーボネート樹脂の使用量（重量部）、Ｍは再生ポリカー
ボネート樹脂の粘度平均分子量である。］を満足する量
混合し、溶融することを特徴とするポリカーボネート樹
脂成形品の再利用方法である。According to the present invention, another polycarbonate resin having a higher molecular weight than that of a regenerated polycarbonate resin is represented by the following formula [1] when reclaiming and reusing a polycarbonate resin molded article having a reduced molecular weight. 0.8 (Ax + By) / (x + y) ≦ M ≦ 1.2 (Ax + By) / (x + y) ... [1] [A is the viscosity average molecular weight of the polycarbonate resin molded product whose molecular weight is decreasing, and B is another Viscosity average molecular weight of the polycarbonate resin, x is the usage amount (parts by weight) of the polycarbonate resin molded product whose molecular weight is decreasing, y is the usage amount of another polycarbonate resin (parts by weight), and M is the viscosity average molecular weight of the regenerated polycarbonate resin. Is. ] It is a method of reusing a polycarbonate resin molded article, which comprises mixing and melting an amount satisfying the above condition.
【００１０】本発明でいうポリカーボネート樹脂は二価
フェノールとカーボネート前駆体を溶液法又は溶融法で
反応させて得られる芳香族ポリカーボネート樹脂であ
る。ここで使用する二価フェノールとしては２，２−ビ
ス（４−ヒドロキシフェニル）プロパン（通称ビスフェ
ノールＡ）を主たる対象とし、その一部又は全部を他の
二価フェノールで置換えてもよい。他の二価フェノール
としては例えば１，１−ビス（４−ヒドロキシフェニ
ル）シクロヘキサン、２，２−ビス（４−ヒドロキシ−
３，５−ジメチルフェニル）プロパン、２，２−ビス
（４−ヒドロキシ−３，５−ジブロモフェニル）プロパ
ン、２，２−ビス（４−ヒドロキシ−３−メチルフェニ
ル）プロパン、ビス（４−ヒドロキシフェニル）サルフ
ァイド、ビス（４−ヒドロキシフェニル）スルホン等が
あげられる。カーボネート前駆体としては例えばカルボ
ニルハライド、カルボニルエステル、ハロホルメート等
があげられ、具体的にはホスゲン、ジフェニルカーボネ
ート、二価フェノールのジハロホルメート等があげられ
る。かかる二価フェノールとカーボネート前駆体からポ
リカーボネート樹脂を製造するに際して適当な分子量調
節剤、加工性改善のための分岐剤、反応を促進するため
の触媒等を必要に応じて使用することができる。更に、
ポリカーボネート樹脂には、必要に応じて添加剤例えば
多価アルコールの脂肪酸のエステル又は部分エステル等
の離型剤、亜燐酸エステル、燐酸エステル、ホスホン酸
エステル等の熱安定剤、ベンゾトリアゾール系、アセト
フェノン系、サリチル酸エステル系等の紫外線吸収剤、
帯電防止剤、着色剤、増白剤、難燃剤等を配合してもよ
い。The polycarbonate resin referred to in the present invention is an aromatic polycarbonate resin obtained by reacting a dihydric phenol and a carbonate precursor by a solution method or a melting method. The dihydric phenol used here is mainly 2,2-bis (4-hydroxyphenyl) propane (commonly called bisphenol A), and a part or all of it may be replaced with another dihydric phenol. Examples of other dihydric phenols include 1,1-bis (4-hydroxyphenyl) cyclohexane and 2,2-bis (4-hydroxy-).
3,5-Dimethylphenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis (4-hydroxy-3-methylphenyl) propane, bis (4-hydroxy) Examples thereof include phenyl) sulfide and bis (4-hydroxyphenyl) sulfone. Examples of the carbonate precursor include carbonyl halide, carbonyl ester, haloformate and the like, and specific examples include phosgene, diphenyl carbonate and dihaloformate of dihydric phenol. When producing a polycarbonate resin from such a dihydric phenol and a carbonate precursor, an appropriate molecular weight modifier, a branching agent for improving processability, a catalyst for accelerating the reaction and the like can be used if necessary. Furthermore,
The polycarbonate resin may include additives such as releasing agents such as fatty acid esters or partial esters of polyhydric alcohols, heat stabilizers such as phosphites, phosphates, phosphonates, benzotriazoles and acetophenones. , Salicylate-based UV absorbers,
You may mix | blend an antistatic agent, a coloring agent, a whitening agent, a flame retardant, etc.
【００１１】本発明で使用する別のポリカーボネート樹
脂としては、通常新しいポリカーボネート樹脂が使用さ
れる。その分子量は、目的とする再生ポリカーボネート
樹脂の分子量より高いことが必要であるが、再生ポリカ
ーボネート樹脂の分子量との差があまりに小さいと、別
のポリカーボネート樹脂の使用量が増大し、再利用によ
る価格メリットが少なくなり、また分子量があまりに高
くなると、再生ポリカーボネート樹脂の分子量の調整が
し難くなるので、再生ポリカーボネート樹脂の分子量よ
り粘度平均分子量で表して５，０００から８０，０００
高いものが好ましい。また、その形状は、特に制限する
必要はないが、分子量が低下しているポリカーボネート
樹脂と均一に混合する必要があるので通常粉粒状かペレ
ット状で使用される。As another polycarbonate resin used in the present invention, a new polycarbonate resin is usually used. Its molecular weight must be higher than the molecular weight of the target recycled polycarbonate resin, but if the difference from the molecular weight of the recycled polycarbonate resin is too small, the amount of another polycarbonate resin used will increase, and the price advantage of reuse When the molecular weight is too low and the molecular weight is too high, it becomes difficult to adjust the molecular weight of the regenerated polycarbonate resin. Therefore, the viscosity average molecular weight of the regenerated polycarbonate resin is 5,000 to 80,000.
Higher ones are preferred. The shape is not particularly limited, but it is usually used in the form of powder or pellets because it needs to be uniformly mixed with the polycarbonate resin having a reduced molecular weight.
【００１２】別のポリカーボネート樹脂の使用量は、そ
の分子量、分子量が低下しているポリカーボネート樹脂
の分子量及び目的とする再生ポリカーボネート樹脂の分
子量によって定まる。分子量が低下しているポリカーボ
ネート樹脂の粘度平均分子量をＡ、その使用量をｘ、別
のポリカーボネート樹脂の粘度平均分子量をＢ、その使
用量をｙ、目的とする再生ポリカーボネート樹脂の粘度
平均分子量をＭとすると、式 ０．８（Ａｘ＋Ｂｙ）／（ｘ＋ｙ）≦Ｍ≦１．２（Ａｘ
＋Ｂｙ）／（ｘ＋ｙ） を満足させればよい。The amount of another polycarbonate resin to be used is determined by its molecular weight, the molecular weight of the polycarbonate resin having a reduced molecular weight, and the molecular weight of the target recycled polycarbonate resin. The viscosity average molecular weight of the polycarbonate resin having a reduced molecular weight is A, the amount thereof is x, the viscosity average molecular weight of another polycarbonate resin is B, the amount thereof is y, and the viscosity average molecular weight of the target recycled polycarbonate resin is M. Then, the formula 0.8 (Ax + By) / (x + y) ≦ M ≦ 1.2 (Ax
It is sufficient to satisfy + By) / (x + y).
【００１３】本発明で再利用する分子量が低下している
ポリカーボネート樹脂成形品の形状は、特に制限する必
要はないが、同時に多量の廃棄物が発生する点から本発
明はシートの廃棄物に適用するのが好ましい。また、再
利用する分子量が低下しているポリカーボネート樹脂成
形品には、長期間の使用で塵埃や油分等が付着している
ので、洗浄した後粉砕し、別のポリカーボネート樹脂と
の混合に供するのが好ましい。洗浄、粉砕、混合に当っ
ては任意の装置が使用される。The shape of the polycarbonate resin molded product of which the molecular weight to be reused in the present invention is reduced is not particularly limited, but the present invention is applied to the waste of the sheet because a large amount of waste is generated at the same time. Preferably. Further, since the polycarbonate resin molded product whose molecular weight to be reused is reduced has dust, oil and the like attached after long-term use, it should be washed and then crushed and then provided for mixing with another polycarbonate resin. Is preferred. Any device is used for washing, crushing and mixing.
【００１４】[0014]
【発明の実施の形態】以下に実施例をあげて本発明を更
に説明する。なお、実施例中の部は重量部であり、評価
は下記の方法によった。 （１）粘度平均分子量；オストワルド粘度計を用いてポ
リカーボネート樹脂０．７g を塩化メチレン１００mlに
溶解した溶液の比粘度ηspを２０℃で測定し、下記式
［２］より極限粘度［η］を求め、更に式［３］に代入
して粘度平均分子量Ｍを算出した。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described below with reference to examples. In addition, the part in an Example is a weight part and evaluation was performed by the following method. (1) Viscosity average molecular weight: The specific viscosity η sp of a solution of 0.7 g of polycarbonate resin dissolved in 100 ml of methylene chloride was measured at 20 ° C. using an Ostwald viscometer, and the intrinsic viscosity [η] was calculated from the following formula [2]. The viscosity average molecular weight M was calculated by substituting it into the formula [3].
【００１５】 ηsp／Ｃ＝［η］＋Ｋ′［η］2 Ｃ ……［２］ ［但し、Ｋ′は０．４５、Ｃは濃度で０．７］ ［η］＝１．２３×１０-4［Ｍ］0.83 ……［３］ （２）引張試験；引張降伏強さ、引張破断強さ、引張破
断伸びはＡＳＴＭ Ｄ−６３８に準拠して測定した。 （３）曲げ試験；曲げ強さ、曲げ弾性率はＡＳＴＭ Ｄ
−７９０に準拠して測定した。 （４）衝撃強さ；ＡＳＴＭ Ｄ−２５６に準拠して測定
した（アイゾット付）。Η sp / C = [η] + K ′ [η] 2 C ...... [2] [where K ′ is 0.45 and C is 0.7] [η] = 1.23 × 10 -4 [M] 0.83 ... [3] (2) Tensile test; Tensile yield strength, tensile rupture strength and tensile rupture elongation were measured according to ASTM D-638. (3) Bending test; bending strength and bending elastic modulus are ASTM D
It measured based on -790. (4) Impact strength: measured according to ASTM D-256 (with Izod).
【００１６】［実施例１］ビスフェノールＡとホスゲン
から常法によって得た粘度平均分子量２３，２００のポ
リカーボネート樹脂を射出成形し、１０年間屋外暴露し
た表１記載の試験片１２０枚を水洗し、風乾し、次いで
穴径１０mmのパンチングメタルを設置した小型粉砕機
［（株）朋来鉄工所製朋来式粉砕機ＭＢ型］で粉砕し
た。粉砕品の粘度平均分子量Ａは１７，３００であっ
た。一方、新しいポリカーボネート樹脂としてビスフェ
ノールＡとホスゲンから常法によって得た粘度平均分子
量３０，０００のポリカーボネート樹脂粉粒体を使用し
た。再生ポリカーボネート樹脂の粘度平均分子量Ｍを２
３，２００に設定し、再利用する粉砕品の使用量ｘを５
部とすると、新しいポリカーボネート樹脂粉粒体の使用
量ｙは４．３部になる。再利用粉砕品５部と新しい樹脂
粉粒体４．３部を混合し、１２０℃で６時間乾燥した後
射出成形機（日本製鋼所製Ｖ１７−６５型スクリュー式
自動射出成形機）で物性試験用の再生試験片を射出成形
し、その評価結果を表２に示した。[Example 1] A polycarbonate resin having a viscosity average molecular weight of 23,200 obtained from bisphenol A and phosgene by a conventional method was injection molded, and 120 test pieces shown in Table 1 exposed outdoors for 10 years were washed with water and air dried. Then, it was crushed by a small crusher [Torai Iron Mfg. Model MB manufactured by Tomoki Iron Works Co., Ltd.] equipped with a punching metal having a hole diameter of 10 mm. The viscosity average molecular weight A of the ground product was 17,300. On the other hand, a polycarbonate resin powder having a viscosity average molecular weight of 30,000 obtained from bisphenol A and phosgene by a conventional method was used as a new polycarbonate resin. The viscosity average molecular weight M of the recycled polycarbonate resin is 2
Set to 3,200 and use amount x of crushed products to be reused is 5
In parts, the usage amount y of the new polycarbonate resin powder is 4.3 parts. 5 parts of recycled crushed product and 4.3 parts of new resin powder and granules are mixed and dried at 120 ° C for 6 hours, and then a physical property test is performed with an injection molding machine (V17-65 type screw type automatic injection molding machine manufactured by Japan Steel Works). Reclaimed test pieces for injection were injection-molded and the evaluation results are shown in Table 2.
【００１７】［実施例２］新しいポリカーボネート樹脂
としてビスフェノールＡとホスゲンから常法によって得
た粘度平均分子量６３，２００のポリカーボネート樹脂
粉粒体０．７４部を使用する以外は実施例１と同様にし
て再生試験片を射出成形し、その評価結果を表２に示し
た。なお、参考のため、ビスフェノールＡとホスゲンか
ら常法によって得た粘度平均分子量２３，２００の新し
いポリカーボネート樹脂の評価結果を表２に参考例とし
て示した。[Example 2] The same procedure as in Example 1 was carried out except that 0.74 part of a polycarbonate resin powder having a viscosity average molecular weight of 63,200 obtained from bisphenol A and phosgene by a conventional method was used as a new polycarbonate resin. Regenerated test pieces were injection molded and the evaluation results are shown in Table 2. For reference, the evaluation results of a new polycarbonate resin having a viscosity average molecular weight of 23,200 obtained from bisphenol A and phosgene by a conventional method are shown in Table 2 as a reference example.
【００１８】[0018]
【表２】 [Table 2]
【００１９】[0019]
【発明の効果】本発明によれば、長期間使用して分子量
が低下しているポリカーボネート樹脂成形品を、大掛か
りな設備や装置を必要とせずに、新しいポリカーボネー
ト樹脂と同様な品質にして再利用することができ、その
奏する工業的効果は格別なものである。EFFECTS OF THE INVENTION According to the present invention, a polycarbonate resin molded product whose molecular weight has been reduced for a long period of time can be reused in the same quality as a new polycarbonate resin without the need for large-scale equipment or equipment. The industrial effects that can be achieved are exceptional.
Claims (5)
樹脂成形品を再生して再利用するに当り、再生ポリカー
ボネート樹脂より分子量が高い別のポリカーボネート樹
脂を下記式［１］ ０．８（Ａｘ＋Ｂｙ）／（ｘ＋ｙ）≦Ｍ≦１．２（Ａｘ＋Ｂｙ）／（ｘ＋ｙ） ……［１］ ［Ａは分子量が低下しているポリカーボネート樹脂成形
品の粘度平均分子量、Ｂは別のポリカーボネート樹脂の
粘度平均分子量、ｘは分子量が低下しているポリカーボ
ネート樹脂成形品の使用量（重量部）、ｙは別のポリカ
ーボネート樹脂の使用量（重量部）、Ｍは再生ポリカー
ボネート樹脂の粘度平均分子量である。］を満足する量
混合し、溶融することを特徴とするポリカーボネート樹
脂成形品の再利用方法。1. When reclaiming and reusing a polycarbonate resin molded product having a lowered molecular weight, another polycarbonate resin having a higher molecular weight than the regenerated polycarbonate resin is represented by the following formula [1] 0.8 (Ax + By) / ( x + y) ≦ M ≦ 1.2 (Ax + By) / (x + y) ... [1] [A is a viscosity average molecular weight of a polycarbonate resin molded product having a reduced molecular weight, B is a viscosity average molecular weight of another polycarbonate resin, x Is the amount (parts by weight) of the polycarbonate resin molded product having a reduced molecular weight, y is the amount (parts by weight) of another polycarbonate resin, and M is the viscosity average molecular weight of the regenerated polycarbonate resin. ] A method for reusing a polycarbonate resin molded article, characterized in that the polycarbonate resin molded article is mixed and melted.
樹脂成形品が、使用により分子量が低下したポリカーボ
ネート樹脂成形品である請求項１記載のポリカーボネー
ト樹脂成形品の再利用方法。2. The method for reusing a polycarbonate resin molded article according to claim 1, wherein the polycarbonate resin molded article having a reduced molecular weight is a polycarbonate resin molded article having a reduced molecular weight due to its use.
樹脂成形品が、シート状のポリカーボネート樹脂成形品
である請求項１又は請求項２記載のポリカーボネート樹
脂成形品の再利用方法。3. The method for reusing a polycarbonate resin molded article according to claim 1 or 2, wherein the polycarbonate resin molded article having a reduced molecular weight is a sheet-shaped polycarbonate resin molded article.
リカーボネート樹脂である請求項１〜３のいずれか１項
記載のポリカーボネート樹脂成形品の再利用方法。4. The method for reusing a polycarbonate resin molded article according to claim 1, wherein the another polycarbonate resin is a new polycarbonate resin.
再生ポリカーボネート樹脂の分子量より粘度平均分子量
で表して５，０００から８０，０００高い分子量である
請求項１〜４のいずれか１項記載のポリカーボネート樹
脂成形品の再利用方法。5. The molecular weight of another polycarbonate resin is
The method for reusing a polycarbonate resin molded article according to any one of claims 1 to 4, which has a molecular weight higher by 5,000 to 80,000 in terms of viscosity average molecular weight than that of the regenerated polycarbonate resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3955596A JP3262983B2 (en) | 1996-02-27 | 1996-02-27 | How to reuse polycarbonate resin molded products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3955596A JP3262983B2 (en) | 1996-02-27 | 1996-02-27 | How to reuse polycarbonate resin molded products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09235405A true JPH09235405A (en) | 1997-09-09 |
| JP3262983B2 JP3262983B2 (en) | 2002-03-04 |
Family
ID=12556323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3955596A Expired - Fee Related JP3262983B2 (en) | 1996-02-27 | 1996-02-27 | How to reuse polycarbonate resin molded products |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3262983B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4881531B2 (en) * | 2000-03-28 | 2012-02-22 | 帝人化成株式会社 | Method for producing recycled resin composition |
| JP2020096127A (en) * | 2018-12-14 | 2020-06-18 | 日亜化学工業株式会社 | Method for manufacturing compound for recycled bond magnet |
| CN111440427A (en) * | 2019-01-17 | 2020-07-24 | 柯尼卡美能达株式会社 | Resin mixture, method for producing same, and injection molding method |
| CN113787666A (en) * | 2021-09-13 | 2021-12-14 | 苏州诚模精密科技有限公司 | Method for improving appearance of injection molding product by using post-consumer recycled material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07214555A (en) * | 1994-01-31 | 1995-08-15 | Tsutsunaka Plast Ind Co Ltd | Reusing method for polycarbonate molded waste |
| JPH08142054A (en) * | 1994-11-25 | 1996-06-04 | Teijin Chem Ltd | Regeneration of aromatic polycarbonate resin |
| JPH08290428A (en) * | 1995-04-25 | 1996-11-05 | Toyoda Spinning & Weaving Co Ltd | Molding method using glass fiber compounded thermoplastic resin recovery material |
-
1996
- 1996-02-27 JP JP3955596A patent/JP3262983B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07214555A (en) * | 1994-01-31 | 1995-08-15 | Tsutsunaka Plast Ind Co Ltd | Reusing method for polycarbonate molded waste |
| JPH08142054A (en) * | 1994-11-25 | 1996-06-04 | Teijin Chem Ltd | Regeneration of aromatic polycarbonate resin |
| JPH08290428A (en) * | 1995-04-25 | 1996-11-05 | Toyoda Spinning & Weaving Co Ltd | Molding method using glass fiber compounded thermoplastic resin recovery material |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4881531B2 (en) * | 2000-03-28 | 2012-02-22 | 帝人化成株式会社 | Method for producing recycled resin composition |
| JP2020096127A (en) * | 2018-12-14 | 2020-06-18 | 日亜化学工業株式会社 | Method for manufacturing compound for recycled bond magnet |
| CN111440427A (en) * | 2019-01-17 | 2020-07-24 | 柯尼卡美能达株式会社 | Resin mixture, method for producing same, and injection molding method |
| JP2020111716A (en) * | 2019-01-17 | 2020-07-27 | コニカミノルタ株式会社 | Resin mixture, method producing the same, and injection molding method |
| CN113787666A (en) * | 2021-09-13 | 2021-12-14 | 苏州诚模精密科技有限公司 | Method for improving appearance of injection molding product by using post-consumer recycled material |
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| Publication number | Publication date |
|---|---|
| JP3262983B2 (en) | 2002-03-04 |
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