JPH05285953A - Recovery method for polypropylene resin molded product - Google Patents
Recovery method for polypropylene resin molded productInfo
- Publication number
- JPH05285953A JPH05285953A JP17450392A JP17450392A JPH05285953A JP H05285953 A JPH05285953 A JP H05285953A JP 17450392 A JP17450392 A JP 17450392A JP 17450392 A JP17450392 A JP 17450392A JP H05285953 A JPH05285953 A JP H05285953A
- Authority
- JP
- Japan
- Prior art keywords
- polypropylene resin
- resin
- pyrrolidone
- polypropylene
- molded product
- 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
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
- Pyrrole Compounds (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はポリプロピレン系樹脂成
形品の回収方法に関する。詳しくは、熱硬化性樹脂が塗
布されて成るポリプロピレン系樹脂成形品の回収方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recovering polypropylene resin moldings. Specifically, it relates to a method for recovering a polypropylene-based resin molded product formed by applying a thermosetting resin.
【０００２】[0002]
【従来の技術】近年、資源の有効利用及び地球環境保全
の観点から、プラスチックの廃棄物の処理回収、再生利
用の要請が高まってきている。ポリプロピレン系樹脂
は、成形品材料としての諸物性に優れているうえ、比較
的回収再生が容易な熱可塑性樹脂のひとつとしてその利
用拡大が期待されている。しかしながら、通常のポリプ
ロピレン系樹脂成形品は、熱硬化性樹脂等で表面を塗布
したような形で用いられることが多い。従って、該成形
品の廃棄物をそのまま回収し、再使用しても、低グレー
ドの成形品しか得ることができない。2. Description of the Related Art In recent years, from the viewpoint of effective use of resources and conservation of the global environment, there is an increasing demand for processing, recovery and recycling of plastic waste. A polypropylene resin is excellent in various physical properties as a molding material, and is expected to be expanded in use as one of the thermoplastic resins which is relatively easy to recover and recycle. However, an ordinary polypropylene resin molded article is often used in a form in which the surface is coated with a thermosetting resin or the like. Therefore, even if the waste of the molded product is directly recovered and reused, only a low-grade molded product can be obtained.
【０００３】例えば、自動車用バンパーとして、熱硬化
性樹脂を塗布したポリプロピレン系樹脂の成形品が、広
く使用されている。しかしながら、該ポリプロピレン製
バンパーは、塗膜の完全剥離が困難であるため、衝撃特
性の劣化や亀裂の発生を招き、高い機械的特性と高品質
の外観を求められるバンパーには再生できず、低グレー
ドの部品に再利用しているにすぎない。For example, as a bumper for automobiles, a molded product of polypropylene resin coated with a thermosetting resin is widely used. However, since it is difficult to completely peel off the coating film from the polypropylene bumper, deterioration of impact properties and generation of cracks are caused, and it is not possible to regenerate a bumper that requires high mechanical properties and high quality appearance, and the low bumper It's just reused for grade parts.
【０００４】そこで、最近、上記バンパーの塗膜を除去
する方法として、ポリプロピレン系樹脂製バンパーを粉
砕し、此れを反応槽に入れ、水、アルコール及び有機塩
から成る特殊な塗膜除去剤に浸し、化学反応により塗膜
を除去し、遠心分離機にかけて乾燥させ、ペレット状の
ポリプロピレン系樹脂に再生する方法が提案されている
（日刊工業新聞１９９１年９月６日号）。Therefore, recently, as a method of removing the coating film of the bumper, a polypropylene resin bumper is crushed and put into a reaction tank, and a special coating film removing agent composed of water, alcohol and organic salt is used. A method has been proposed in which the coating film is soaked, the coating film is removed by a chemical reaction, dried by a centrifuge, and regenerated into a polypropylene resin pellet (Nikkan Kogyo Shimbun, September 6, 1991).
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記の
方法では廃液処理が必要となり、また、再生工程が複雑
になるので、再生コストが高くなるという問題点が考え
られる。However, in the above method, waste liquid treatment is required, and the regeneration process is complicated, so that the regeneration cost is high.
【０００６】[0006]
【課題を解決するための手段】本発明者等は上記実情に
鑑み、ポリプロピレン系樹脂成形品の簡便かつ効率的な
回収方法につき鋭意検討した結果、該成形品をピロリド
ン液で浸漬することにより、成形品の塗膜が容易に剥離
でき、更に、該塗膜とポリプロピレン系樹脂の分離も、
ピロリドン液中での両者の比重差により、容易になしう
ることを見い出し、本発明を完成するに至った。Means for Solving the Problems In view of the above circumstances, the inventors of the present invention have made earnest studies on a simple and efficient method for recovering a polypropylene resin molded product, and as a result, by dipping the molded product in a pyrrolidone solution, The coating film of the molded product can be easily peeled off, and the coating film and polypropylene resin can be separated from each other.
It was found that this can be easily done by the difference in specific gravity between the two in the pyrrolidone solution, and the present invention has been completed.
【０００７】即ち、本発明の要旨は、熱硬化性樹脂が塗
布されて成るポリプロピレン系樹脂成形品を、ピロリド
ン液に浸漬して該成形品より熱硬化性樹脂塗膜を剥離さ
せ、ポリプロピレン系樹脂成形品と熱硬化性樹脂塗膜と
を該ピロリドン液に対する比重差により分離して該ポリ
プロピレン系樹脂成形品を回収することを特徴とするポ
リプロピレン系樹脂成形品の回収方法、に存する。That is, the gist of the present invention is to immerse a polypropylene-based resin molded article formed by applying a thermosetting resin in a pyrrolidone solution to peel off the thermosetting resin coating film from the molded article to obtain a polypropylene-based resin. A method for recovering a polypropylene resin molded product, characterized in that the molded product and the thermosetting resin coating film are separated by a difference in specific gravity with respect to the pyrrolidone liquid to recover the polypropylene resin molded product.
【０００８】以下本発明につき更に詳細に説明する。熱
硬化性樹脂が塗布されて成るポリプロピレン系樹脂成形
品として、自動車用のバンパーがその代表として例示さ
れる。ポリプロピレン系樹脂は、重合体の主要単位がポ
リプロピレンであるが、成形品としての諸物性向上のた
めに、種々の第三成分が含んでもよく、また、重合法に
よりその結晶構造等も多岐に渡る。ポリプロピレン系樹
脂の具体例としては、例えば結晶性を有するアイソタク
チックプロピレン単独重合体や、エチレン単位の含有量
が少ないエチレンプロピレンランダム共重合体から成る
共重合部又はプロピレン単独重合体からなるホモ重合部
とエチレン単位の含有量が比較的多いエチレンプロピレ
ンランダム共重合体から成る共重合部とから構成され
た、いわゆるプロピレンブロック共重合体として市販さ
れている実質上結晶性のプロピレンとエチレンとのブロ
ック共重合体、あるいはこのブロック共重合体における
各ホモ重合部又は共重合部が、さらにブテン−１などの
α−オレフィンを共重合したものから成る実質上結晶プ
ロピレン−エチレン−α−オレフィン共重合体等が挙げ
られる。The present invention will be described in more detail below. A typical example of the polypropylene resin molded article formed by applying a thermosetting resin is a bumper for automobiles. Polypropylene-based resin is a polymer whose main unit is polypropylene, but may contain various third components in order to improve various physical properties as a molded product, and its crystal structure and the like are various depending on the polymerization method. .. Specific examples of the polypropylene-based resin, for example, isotactic propylene homopolymer having crystallinity, a copolymerization part consisting of ethylene propylene random copolymer having a low content of ethylene units or a homopolymerization consisting of propylene homopolymer. Block and a block of substantially crystalline propylene and ethylene, which is commercially available as a so-called propylene block copolymer, composed of a copolymer part composed of an ethylene-propylene random copolymer having a relatively large content of ethylene units. Copolymers, or substantially crystalline propylene-ethylene-α-olefin copolymers in which each homopolymerization part or copolymerization part of this block copolymer further comprises an α-olefin such as butene-1 Etc.
【０００９】また、プロピレンにエチレン系共重合体ゴ
ム、例えばエチレン−プロピレン共重合体ゴム又はエチ
レン−プロピレン−ブタジエン３元共重合体を少量から
主成分量として配合したものも使用できる。更に、ポリ
プロピレン系樹脂にはタルク、炭酸カルシウム等の無機
性フィラー、カーボンブラック等の顔料、酸化防止剤、
紫外線吸収剤、熱安定剤等の添加剤を配合することがで
きる。It is also possible to use a mixture of propylene with an ethylene copolymer rubber, for example, an ethylene-propylene copolymer rubber or an ethylene-propylene-butadiene terpolymer as a main component in a small amount. Further, polypropylene resin includes talc, an inorganic filler such as calcium carbonate, a pigment such as carbon black, an antioxidant,
Additives such as an ultraviolet absorber and a heat stabilizer can be added.
【００１０】次に、以上のポリプロピレン系樹脂成形品
に塗布されている熱硬化性樹脂としては、通常、塗料に
用いられるようなものであればよく、ウレタン樹脂、フ
ェノール樹脂、メラニン樹脂、エポキシ樹脂、アルキド
樹脂、尿素樹脂等が挙げられる。これらの熱硬化性樹脂
は、ポリプロピレン系樹脂層上に直接塗布してもよい
し、また、ウレタン樹脂、エポキシ樹脂のプライマーを
下塗りした後、更に別の熱硬化性樹脂の塗料を塗布する
方法も採用される。Next, the thermosetting resin applied to the above polypropylene resin molded article may be any one which is usually used in paints, such as urethane resin, phenol resin, melanin resin and epoxy resin. , Alkyd resins, urea resins and the like. These thermosetting resins may be applied directly on the polypropylene resin layer, or a method of applying another thermosetting resin coating after undercoating a urethane resin or epoxy resin primer. Adopted.
【００１１】本発明では、上記成形品のうち、主にその
不合格品または使用済の廃棄対象物をそのまま、あるい
は処理が行いやすい程度に切断機、圧砕機等で機械的に
細かく粉砕した小片とし、該小片をピロリドン液に浸漬
する。小片の大きさは、特に制限はないが、その一片が
通常０．１ｍｍ角〜２０ｃｍ角、好ましくは０．１ｍｍ
角〜５ｃｍ角程度で実施される。ピロリドン液への浸漬
により成形品のポリプロピレン系樹脂層と塗膜の界面に
ピロリドン液が浸透していき、塗膜が剥離される。In the present invention, among the above-mentioned molded products, mainly the rejected products or the used wastes are discarded, or small pieces mechanically crushed by a cutting machine, a crusher or the like to the extent that they can be easily processed. And soaking the small piece in the pyrrolidone solution. The size of the small piece is not particularly limited, but one piece is usually 0.1 mm square to 20 cm square, preferably 0.1 mm square.
Square to 5 cm square is used. By the immersion in the pyrrolidone solution, the pyrrolidone solution penetrates into the interface between the polypropylene resin layer of the molded article and the coating film, and the coating film is peeled off.
【００１２】浸漬の条件としては、成形品の全量に対
し、通常１〜５０重量倍のピロリドン液に該成形品を、
通常１０〜１５０℃、好ましくは２５〜１３０℃の温度
で、通常３０秒から５時間、好ましくは５〜３０分間行
なわれる。また、該浸漬を、攪拌状態で、もしくは超音
波を照射しながら行うと、塗膜の剥離が促進されるの
で、浸漬時間を短縮することができる。The dipping conditions are usually 1 to 50 times the weight of the molded product in the pyrrolidone solution, based on the total amount of the molded product.
It is usually carried out at a temperature of 10 to 150 ° C., preferably 25 to 130 ° C., usually for 30 seconds to 5 hours, preferably for 5 to 30 minutes. Further, when the dipping is performed in a stirring state or while irradiating ultrasonic waves, peeling of the coating film is promoted, so that the dipping time can be shortened.
【００１３】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 the pyrrolidone compound, 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 (for example, 5-methyl-2-pyrrolidone, 5-ethyl-
2-pyrrolidone, 5-propyl-2-pyrrolidone), N
-Vinyl-2-pyrrolidone, N-alkyl-3-pyrrolidone (for example, N-methyl-3-pyrrolidone, N-ethyl-3-pyrrolidone, N-propyl-3-pyrrolidone)
Etc., but N-methyl-2-pyrrolidone is particularly effective.
【００１４】ピロリドン液はピロリドン化合物のみでも
よいし、その他の成分として、ピロリドン化合物に対し
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
で含めることができる。本発明の効果を損なう場合とし
ては、具体的には、ピロリドン化合物の剥離効果が低下
すること、もしくは、ピロリドン液の比重が大きく変動
し、以下に説明する分離操作が困難となることが揚げら
れる。The pyrrolidone solution may be a pyrrolidone compound alone, or as another component, water or an organic solvent such as alcohol, which is compatible with the pyrrolidone compound,
A maximum of about 50% by volume can be included within a range that does not impair the effects of the present invention. As a case where the effect of the present invention is impaired, specifically, the peeling effect of the pyrrolidone compound is decreased, or the specific gravity of the pyrrolidone solution is largely changed, and it is said that the separation operation described below becomes difficult. ..
【００１５】次に、以上のように浸漬した液を静置する
と、例えば、Ｎ−メチル−２−ピロリドンをピロリドン
液とすると該液の密度が約１．０ｇ／ｃｍ3に対し、ポ
リプロピレン系樹脂の密度が約０．９ｇ／ｃｍ3、ま
た、熱硬化性樹脂の密度が通常１．２ｇ／ｃｍ3以上で
あることにより、比重差によりポリプロピレン系樹脂と
熱硬化性樹脂塗膜が容易に分離できる。即ち、ポリプロ
ピレン系樹脂が液面に浮遊し、塗膜が液底に沈降する。
分離速度が充分でない場合は遠心分離を行ってもよい。
ポリプロピレン系樹脂および塗膜は、共に溶解、分解等
はほとんどなく、ほぼ完全に回収される。これらは、通
常、水洗、乾燥した後、再生用材料として使用される。Next, when the liquid soaked as described above is allowed to stand, for example, when N-methyl-2-pyrrolidone is used as a pyrrolidone liquid, the density of the liquid is about 1.0 g / cm 3, whereas polypropylene resin is used. Has a density of about 0.9 g / cm 3 and the density of the thermosetting resin is usually 1.2 g / cm 3 or more, so that the polypropylene resin and the thermosetting resin coating film can be easily separated due to the difference in specific gravity. it can. That is, the polypropylene resin floats on the liquid surface and the coating film settles on the liquid bottom.
If the separation speed is not sufficient, centrifugation may be performed.
The polypropylene resin and the coating film are almost completely recovered with almost no dissolution or decomposition. These are usually used as a regenerating material after being washed with water and dried.
【００１６】[0016]
【実施例】以下本発明を実施例により更に詳細に説明す
るが、本発明はその要旨を越えない限りこれらの実施例
に限定されるものではない。EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited to these examples unless it exceeds the gist.
【００１７】実施例１ 使用済のポリウレタン系樹脂塗膜付ポリプロピレン樹脂
製バンパーを切断機で３ｃｍ角に切断した細片１８．６
ｇと、Ｎ−メチル−２−ピロリドン（２５℃での比重
１．０３／ｃｍ3）１５０ｇを攪拌層に入れ、攪拌下、
２５℃で３０分間浸漬した。その後、該浸漬処理液を静
置したところ、液面に細片の大部分が浮遊し、液底に少
量に樹脂の薄片が沈殿した。これら浮遊物、沈殿物をそ
れぞれ回収し、水洗、乾燥した後、回収量と比重を求め
た。Example 1 A strip 18.6 obtained by cutting a used polypropylene resin bumper with a polypropylene resin coating into a 3 cm square with a cutting machine.
g and N-methyl-2-pyrrolidone (specific gravity at 25 ° C., 1.03 / cm 3 ) 150 g were put in a stirring layer and stirred,
It was immersed at 25 ° C. for 30 minutes. Then, when the immersion treatment liquid was allowed to stand still, most of the small pieces floated on the liquid surface and a small amount of resin thin pieces precipitated on the liquid bottom. These suspended solids and precipitates were collected, washed with water and dried, and then the recovered amount and the specific gravity were determined.
【００１８】回収量は浮遊物が１８．１ｇ（比重０．９
２ｇ／ｃｍ3）、沈殿物が０．５ｇ（比重１．４２ｇ／
ｃｍ3）であった。次に、回収した樹脂片について、赤
外線吸収スペクトル分析を行ない、浮遊物がポリプロピ
レン樹脂であり、沈殿物がポリウレタン系樹脂であるこ
と、更に、ポリプロピレン樹脂の細片の表面へのポリウ
レタン系樹脂塗膜が全くないことを確認した。The collected amount of suspended matter was 18.1 g (specific gravity 0.9
2 g / cm 3 ) and 0.5 g of precipitate (specific gravity 1.42 g /
cm 3 ). Next, with respect to the collected resin pieces, infrared absorption spectrum analysis was performed, and the suspended matter was a polypropylene resin and the precipitate was a polyurethane resin, and further, a polyurethane resin coating film on the surface of the polypropylene resin strips. It was confirmed that there was no.
【００１９】実施例２〜４ 実施例１においてＮ−メチル−２−ピロリドン（ＮＭ
Ｐ）と水の混合比、浸漬処理の温度及び時間を表−１の
ように変えて行なったこと以外は同様にして行った。得
られた結果は実施例１と全く同様であった。Examples 2 to 4 N-methyl-2-pyrrolidone (NM
The same procedure was carried out except that the mixing ratio of P) and water, the temperature and time of the dipping treatment were changed as shown in Table 1. The results obtained were exactly the same as in Example 1.
【００２０】実施例５ 仕様済のポリウレタン系樹脂塗膜付ポリプロピレン樹脂
製バンパーを切断機で３ｃｍ×１５ｃｍの小片に切断し
た細片９３．０ｇと、Ｎ−メチル−２−ピロリドン（２
５℃で比重１．０３ｇ／ｃｍ3）７５０ｇを撹拌槽に入
れ、撹拌下、２５℃で３０分間浸漬した。その後、該浸
漬処理液を静置したところ、液面に細片の大部分が浮遊
し、液底に少量の樹脂の薄片が沈殿した。これら浮遊
物、沈殿物をそれぞれ回収し、水洗、乾燥した後、回収
量と比重を求めた。回収量は浮遊物が９０．５ｇ（比重
０．９２ｇ／ｃｍ3）、沈殿物が２５ｇ（比重１．４２
ｇ／ｃｍ3）であった。次に、回収した樹脂片につい
て、赤外線吸収スペクトル分析を行ない、浮遊物がポリ
プロピレン樹脂であり、沈殿物がポリウレタン系樹脂で
あること、更に、ポリプロピレン樹脂の細片の表面への
ポリウレタン系樹脂塗膜が全くないことを確認した。Example 5 93.0 g of strips obtained by cutting a polypropylene resin bumper with a polyurethane resin coating film, which had been specified, into 3 cm × 15 cm pieces with a cutting machine, and N-methyl-2-pyrrolidone (2
750 g of a specific gravity of 1.03 g / cm 3 at 5 ° C. was placed in a stirring tank and immersed at 25 ° C. for 30 minutes under stirring. Then, when the immersion treatment liquid was allowed to stand still, most of the small pieces floated on the liquid surface and a small amount of resin thin pieces precipitated on the liquid bottom. These suspended solids and precipitates were collected, washed with water and dried, and then the recovered amount and specific gravity were determined. The recovered amount was 90.5 g of floating material (specific gravity 0.92 g / cm 3 ) and 25 g of sediment (specific gravity 1.42 g).
g / cm 3 ). Next, with respect to the collected resin pieces, infrared absorption spectrum analysis was performed, and the floating material was a polypropylene resin and the precipitate was a polyurethane resin, and further, a polyurethane resin coating film on the surface of the polypropylene resin strips. It was confirmed that there was no.
【００２１】[0021]
【表１】 [Table 1]
【００２２】[0022]
【発明の効果】本発明によりポリプロピレン系樹脂成形
品を簡便かつ効率よく回収することができる。即ち熱硬
化性樹脂が塗付されたポリプロピレン系樹脂からなる成
形品より、高純度のポリプロピレン系樹脂を簡便に回収
することができ、該樹脂の再利用に好適である。また、
熱硬化性樹脂も固形塗膜として回収されるので、ピロリ
ドン液も溶剤としての回収、再利用も容易であり、極め
て経済的である。更に、該ピロリドン液は、一般に毒性
が弱く、金属に対する腐食性もないため、浸漬槽等の器
具を特殊材質にする必要もなく、熱硬化性樹脂塗膜剥離
剤として広く利用される。According to the present invention, a polypropylene resin molded product can be easily and efficiently recovered. That is, a high-purity polypropylene resin can be easily recovered from a molded product made of a polypropylene resin coated with a thermosetting resin, which is suitable for reuse of the resin. Also,
Since the thermosetting resin is also recovered as a solid coating film, the pyrrolidone solution can be easily recovered and reused as a solvent, which is extremely economical. Further, since the pyrrolidone solution generally has low toxicity and is not corrosive to metals, it is not necessary to use a special material for a device such as a dipping tank, and it is widely used as a thermosetting resin film peeling agent.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 清水 敦雄 名古屋市中村区名駅三丁目28番12号 三菱 化成株式会社名古屋支店内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Atsushio Shimizu 28-3 Meieki, Nakamura-ku, Nagoya City Mitsubishi Kasei Corporation Nagoya Branch
Claims (2)
ロピレン系樹脂成形品を、ピロリドン液に浸漬して該成
形品より熱硬化性樹脂塗膜を剥離させ、ポリプロピレン
系樹脂成形品と熱硬化性樹脂塗膜とを該ピロリドン液に
対する比重差により分離して該ポリプロピレン系樹脂成
形品を回収することを特徴とするポリプロピレン系樹脂
成形品の回収方法。1. A polypropylene-based resin molded article coated with a thermosetting resin is immersed in a pyrrolidone solution to peel off the thermosetting resin coating film from the molded article, and the polypropylene-based resin molded article and the thermosetting resin are cured. A method for recovering a polypropylene resin molded product, comprising separating the resin coating film by a difference in specific gravity with respect to the pyrrolidone solution and recovering the polypropylene resin molded product.
ン系樹脂成形品に塗布された熱硬化性樹脂塗膜剥離剤。2. A thermosetting resin film release agent applied to a polypropylene resin molded article, which comprises a pyrrolidone solution.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4-28498 | 1992-02-14 | ||
| JP2849892 | 1992-02-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05285953A true JPH05285953A (en) | 1993-11-02 |
| JP2512265B2 JP2512265B2 (en) | 1996-07-03 |
Family
ID=12250339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17450392A Expired - Fee Related JP2512265B2 (en) | 1992-02-14 | 1992-07-01 | Collection method of polypropylene resin moldings |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2512265B2 (en) |
-
1992
- 1992-07-01 JP JP17450392A patent/JP2512265B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2512265B2 (en) | 1996-07-03 |
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