JPH05322811A - Method for sorting remolding of crystalline thermoplastic - Google Patents
Method for sorting remolding of crystalline thermoplasticInfo
- Publication number
- JPH05322811A JPH05322811A JP12528792A JP12528792A JPH05322811A JP H05322811 A JPH05322811 A JP H05322811A JP 12528792 A JP12528792 A JP 12528792A JP 12528792 A JP12528792 A JP 12528792A JP H05322811 A JPH05322811 A JP H05322811A
- Authority
- JP
- Japan
- Prior art keywords
- polymer
- heat
- recycled
- fusion
- measured
- 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
Landscapes
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、熱可塑性結晶性プラス
チックをリサイクル成形する際のポリマー選別方法に関
する。さらに詳しくは、熱分析装置を用いた新規なポリ
マー選別方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polymer selection method for recycling and molding thermoplastic crystalline plastics. More specifically, the present invention relates to a novel polymer selection method using a thermal analysis device.
【０００２】[0002]
【従来の技術】従来から、地球資源の有効活用の観点か
ら熱可塑性結晶性プラスチックをリサイクル成形するこ
とが推奨されている。例えば、プラスチック成形体、ポ
リマーボトル、フィルム、繊維など、リサイクル成形さ
れている範囲は広い。このリサイクル成形は、単に回収
したポリマーを溶融してチップ化した後、再溶融して原
料系に供給するというような単純なものではない。リサ
イクルポリマーはバージンポリマー（モノマーから重合
した後のポリマー）ほど品質が良くないので、成形体の
品質レベルを低下させないような工夫が必要である。そ
こで、リサイクルポリマーを再使用するには、多くの場
合バージンポリマーに一定量リサイクルポリマーを混入
して使用している。例えば、５〜３０％といったように
品種に応じて混入量を決めている。また、１００％リサ
イクルポリマーを使う場合は、品質があまり高くない製
品に限って使用されている。2. Description of the Related Art Recycle molding of thermoplastic crystalline plastics has been conventionally recommended from the viewpoint of effective utilization of global resources. For example, plastic moldings, polymer bottles, films, fibers, etc. are widely recycled and molded. This recycle molding is not a simple one in which the recovered polymer is simply melted into chips and then remelted and supplied to the raw material system. Recycled polymers are not as good as virgin polymers (polymers after polymerization from monomers), so it is necessary to devise measures that do not reduce the quality level of the molded product. Therefore, in order to reuse the recycled polymer, in many cases, a certain amount of the recycled polymer is mixed with the virgin polymer before use. For example, the mixing amount is determined according to the type, such as 5 to 30%. Further, when using 100% recycled polymer, it is used only for products of not so high quality.
【０００３】しかしながら、バージンポリマーに一定量
リサイクルポリマーを混入したり、１００％リサイクル
ポリマーで成形するにしても、リサイクルポリマー自体
が、何回もの熱履歴を受けていると、成形体はゲル化ポ
リマーを含んで欠陥が出たり、異物になり易かったりし
て、成形品製品にとって致命的なダメージを与える場合
がある。たとえば成形後に多量に不良品を出すというよ
うなトラブルである。However, even if a certain amount of recycled polymer is mixed in the virgin polymer or if the recycled polymer itself is molded with 100% recycled polymer, if the recycled polymer itself is subjected to heat history many times, the molded product will be a gelled polymer. In some cases, defects may be generated due to the inclusion of the above, or foreign matter may be easily generated, which may cause fatal damage to the molded product. For example, the problem is that a large number of defective products are produced after molding.
【０００４】従来法においては、リサイクルポリマーの
選別方法は確立されていなかったので、しばしばこの様
なトラブルが発生していた。すなわち、プラスチック材
料は製造工程、成形工程で熱を受けて一部劣化（分解）
する。特に何度も再生して使用しようとする場合、次第
に当初の特性を失っていくものである。この様な特性を
迅速にかつ適性に評価できる測定方法が要請されてい
る。[0004] In the conventional method, such a trouble has often occurred because a method for selecting recycled polymer has not been established. That is, the plastic material is partially degraded (decomposed) by receiving heat during the manufacturing process and molding process.
To do. Especially when it is regenerated and used many times, the original characteristics are gradually lost. There is a demand for a measuring method capable of quickly and appropriately evaluating such characteristics.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、従来の
技術においては熱可塑性結晶性ポリマーの劣化の度合を
簡単に評価できる手段はなかった。However, in the prior art, there was no means for easily evaluating the degree of deterioration of the thermoplastic crystalline polymer.
【０００６】本発明は、前記従来技術の課題を解決する
ため、熱可塑性結晶性ポリマーの劣化の度合を簡単に評
価できる選別方法を提供することを目的とする。In order to solve the above-mentioned problems of the prior art, it is an object of the present invention to provide a screening method capable of easily evaluating the degree of deterioration of a thermoplastic crystalline polymer.
【０００７】[0007]
【課題を解決するための手段】前記目的を達成するた
め、本発明の熱可塑性結晶性プラスチックのリサイクル
成形選別方法は、熱可塑性結晶性プラスチックをリサイ
クル成形する際のポリマー選別方法において、熱分析装
置を用いて測定した融解熱量が、モノマーから重合した
最初のポリマーの融解熱量の一定の割合以上のものをリ
サイクル成形に使用することを特徴とする。In order to achieve the above-mentioned object, a method for recycling and selecting a thermoplastic crystalline plastic according to the present invention is a method for selecting a polymer for recycling and molding a thermoplastic crystalline plastic. It is characterized in that the amount of heat of fusion measured by using a polymer having a certain ratio or more of the amount of heat of fusion of the first polymer polymerized from the monomer is used for recycling molding.
【０００８】[0008]
【作用】前記本発明の構成によれば、熱分析装置を用い
て測定した融解熱量が、モノマーから重合した最初のポ
リマーの融解熱量の一定の割合以上のものをリサイクル
成形に使用することにより、異常に劣化したポリマーの
混入を防ぎ、常に良好なリサイクルポリマーを再使用す
ることができる。すなわち、熱可塑性結晶性プラスチッ
クは、通常、劣化、分解が促進すると結晶化度が低下し
融解熱量が小さくなる。これを測定し、材料評価の指標
とする。また、熱分析装置を用いた融解熱量測定は、前
処理などを必要とせず、比較的簡単かつ迅速にできる測
定手段であり、選別方法として優れたものである。According to the above-mentioned constitution of the present invention, the amount of heat of fusion measured by using the thermal analysis device is equal to or more than a certain ratio of the amount of heat of fusion of the first polymer polymerized from the monomer. It is possible to prevent contamination of abnormally deteriorated polymers and always reuse good recycled polymers. That is, in a thermoplastic crystalline plastic, the degree of crystallinity and the amount of heat of fusion are usually reduced when deterioration and decomposition are promoted. This is measured and used as an index for material evaluation. Further, the heat of fusion measurement using a thermal analyzer is a measurement means that can be relatively simple and quick without requiring pretreatment, and is an excellent selection method.
【０００９】[0009]
【実施例】以下実施例を用いて本発明をさらに具体的に
説明する。The present invention will be described in more detail with reference to the following examples.
【００１０】本発明は、一例としてポリエチレン（Ｐ
Ｅ），ポリプロピレン（ＰＰ），ポリスチレン（Ｐ
Ｓ）、ポリエチレンテレフタレート（ＰＥＴ）、ポリブ
チレンテレフタレート（ＰＢＴ）、ポリカーボネート、
ポリアセタール、各種ナイロン等のリサイクル成形の可
能な結晶性のプラスチックに適用される。もちろん前記
以外のポリマーにも適用することが可能である。In the present invention, as an example, polyethylene (P
E), polypropylene (PP), polystyrene (P
S), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycarbonate,
It is applied to crystalline plastics such as polyacetal and various nylons that can be recycled. Of course, it is possible to apply to polymers other than the above.
【００１１】熱分析装置は、具体的にはＤＳＣ（示差走
査熱量計），ＤＴＡ（示差熱分析計）などを使用する。As the thermal analyzer, specifically, a DSC (differential scanning calorimeter), a DTA (differential thermal analyzer) or the like is used.
【００１２】次にポリプロピレン（ＰＰ）を用いて実際
に融解熱量を測定したデータを説明する。図１はＰＰの
バージンポリマーのＤＳＣのデータである。融解熱量は
９６．３６Ｊ／ｇであった。このときの測定条件は、ポ
リマー量：４．９４４ｍｇ、昇温条件：１０℃／min と
した。Next, the data obtained by actually measuring the heat of fusion using polypropylene (PP) will be described. FIG. 1 shows the DSC data of virgin polymer of PP. The heat of fusion was 96.36 J / g. The measurement conditions at this time were a polymer amount: 4.944 mg and a temperature raising condition: 10 ° C./min.
【００１３】次に図２は、前記ポリプロピレン（ＰＰ）
を２３０℃で１時間溶融状態とし、次に冷却・固化し、
再び２３０℃で１時間溶融状態とし、次に冷却・固化し
たときのＤＳＣの融解熱量のデータである（測定条件は
前記と同一）。その結果、融解熱量は８０．２６Ｊ／ｇ
であった。すなわち、バージンポリマーに比較して融解
熱量は約８３％に低下していることが確認できた。な
お、２３０℃で１時間溶融状態で１回保持した場合は、
融解熱量は約９０％に低下していた。Next, FIG. 2 shows the polypropylene (PP).
Melted at 230 ℃ for 1 hour, then cooled and solidified,
This is data on the heat of fusion of DSC when the material is melted again at 230 ° C. for 1 hour and then cooled and solidified (measurement conditions are the same as above). As a result, the heat of fusion is 80.26 J / g
Met. That is, it was confirmed that the heat of fusion was reduced to about 83% as compared with the virgin polymer. In addition, when the molten state is held once at 230 ° C. for 1 hour,
The heat of fusion was reduced to about 90%.
【００１４】以上の結果から、融解熱量を測定すること
により、熱劣化の程度を知ることができ、この熱劣化の
程度と最終製品の品質の関係からリサイクルポリマーの
投入割合を決めることができる。また、融解熱量が極端
に低い場合はリサイクルは困難という選別を下せる。From the above results, it is possible to know the degree of heat deterioration by measuring the heat of fusion, and the ratio of recycled polymer can be determined from the relationship between the degree of heat deterioration and the quality of the final product. In addition, if the heat of fusion is extremely low, recycling can be difficult.
【００１５】なお、前記実施例においては、昇温時の融
解熱量を測定したが、ＤＴＡ，ＤＳＣなどの熱分析装置
を用いて、溶融状態からの冷却過程における結晶化熱を
測定することによっても、同様にポリマーの熱劣化程度
を判別することができる。Although the amount of heat of fusion at the time of temperature rise was measured in the above embodiment, it can also be measured by measuring the heat of crystallization in the cooling process from the molten state using a thermal analyzer such as DTA or DSC. Similarly, the degree of thermal deterioration of the polymer can be determined.
【００１６】以上説明した通り、本発明の一実施例によ
れば、下記の利点を得ることができる。 （１）短時間にかつ簡便にプラスチック材料の劣化度を
評価できる。 （２）再生品をどこまで使用できるかのチェックをする
ことができる。 （３）ポリマー成形の工程管理に使用することができ
る。 （４）ポリマー成形工程などの熱処理温度が妥当かどう
かの検討をすることができる。As described above, according to one embodiment of the present invention, the following advantages can be obtained. (1) The degree of deterioration of a plastic material can be evaluated easily in a short time. (2) It is possible to check how much the recycled product can be used. (3) It can be used for process control of polymer molding. (4) It is possible to examine whether or not the heat treatment temperature in the polymer molding step is appropriate.
【００１７】[0017]
【発明の効果】以上説明した通り本発明は、熱可塑性結
晶性プラスチックをリサイクル成形する際、熱分析装置
を用いて測定した融解熱量が、モノマーから重合した最
初のポリマー（バージンポリマー）の融解熱量の一定の
割合以上のものをリサイクル成形に使用することによ
り、前処理などを必要とせず、比較的簡単かつ迅速に測
定でき、選別方法として優れたものである。As described above, according to the present invention, when the thermoplastic crystalline plastic is recycled and molded, the heat of fusion measured by a thermal analyzer is the heat of fusion of the first polymer (virgin polymer) polymerized from the monomer. By using at least a certain ratio of the above in the recycle molding, pretreatment is not required and the measurement can be performed relatively easily and quickly, which is an excellent selection method.
【図１】本発明の一実施例のポリプロピレンのバージン
ポリマーのＤＳＣの融解熱量を示すデータである。FIG. 1 is data showing a DSC heat of fusion of a polypropylene virgin polymer according to an embodiment of the present invention.
【図２】本発明の一実施例のポリプロピレンのリサイク
ルポリマーのＤＳＣの融解熱量を示すデータである。FIG. 2 is data showing the DSC heat of fusion of a recycled polypropylene polymer according to an example of the present invention.
Claims (1)
ル成形する際のポリマー選別方法において、熱分析装置
を用いて測定した融解熱量が、モノマーから重合した最
初のポリマーの融解熱量の一定の割合以上のものをリサ
イクル成形に使用することを特徴とする熱可塑性結晶性
プラスチックのリサイクル成形選別方法。1. A method for selecting a polymer for recycling and molding a thermoplastic crystalline plastic, wherein a heat of fusion measured by a thermal analyzer is a certain proportion or more of a heat of fusion of a first polymer polymerized from a monomer. Is used for recycling molding, and a method for selecting a recycling molding of thermoplastic crystalline plastics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12528792A JP2513106B2 (en) | 1992-05-19 | 1992-05-19 | Recycling molding selection method for thermoplastic crystalline plastics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12528792A JP2513106B2 (en) | 1992-05-19 | 1992-05-19 | Recycling molding selection method for thermoplastic crystalline plastics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05322811A true JPH05322811A (en) | 1993-12-07 |
| JP2513106B2 JP2513106B2 (en) | 1996-07-03 |
Family
ID=14906347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12528792A Expired - Fee Related JP2513106B2 (en) | 1992-05-19 | 1992-05-19 | Recycling molding selection method for thermoplastic crystalline plastics |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2513106B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012132690A (en) * | 2010-12-20 | 2012-07-12 | Sumitomo Wiring Syst Ltd | Method for evaluating thermal stability and degree of deterioration of resin product |
| CN105372287A (en) * | 2015-12-22 | 2016-03-02 | 天津市建筑材料产品质量监督检测中心 | Method for detecting polystyrene reworked material in extruded polystyrene board |
| CN109725020A (en) * | 2018-11-21 | 2019-05-07 | 北方华锦化学工业股份有限公司 | A kind of fractional crystallization method of polypropylene lithium battery diaphragm PP Pipe Compound |
| EP3995901A1 (en) | 2020-11-04 | 2022-05-11 | Konica Minolta, Inc. | Toner container information acquiring method, toner container sorting method, toner container pulverizing method, toner container processing method, and toner container manufacturing method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4365984B2 (en) | 1999-05-14 | 2009-11-18 | キヤノン株式会社 | Manufacturing method of recycled plastic material |
-
1992
- 1992-05-19 JP JP12528792A patent/JP2513106B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012132690A (en) * | 2010-12-20 | 2012-07-12 | Sumitomo Wiring Syst Ltd | Method for evaluating thermal stability and degree of deterioration of resin product |
| CN105372287A (en) * | 2015-12-22 | 2016-03-02 | 天津市建筑材料产品质量监督检测中心 | Method for detecting polystyrene reworked material in extruded polystyrene board |
| CN109725020A (en) * | 2018-11-21 | 2019-05-07 | 北方华锦化学工业股份有限公司 | A kind of fractional crystallization method of polypropylene lithium battery diaphragm PP Pipe Compound |
| EP3995901A1 (en) | 2020-11-04 | 2022-05-11 | Konica Minolta, Inc. | Toner container information acquiring method, toner container sorting method, toner container pulverizing method, toner container processing method, and toner container manufacturing method |
| US11556079B2 (en) | 2020-11-04 | 2023-01-17 | Konica Minolta, Inc. | Toner container information acquiring method, toner container sorting method, toner container pulverizing method, toner container processing method, and toner container manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2513106B2 (en) | 1996-07-03 |
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