JPH07112436A - Regenerating method of coated resin component - Google Patents
Regenerating method of coated resin componentInfo
- Publication number
- JPH07112436A JPH07112436A JP26135893A JP26135893A JPH07112436A JP H07112436 A JPH07112436 A JP H07112436A JP 26135893 A JP26135893 A JP 26135893A JP 26135893 A JP26135893 A JP 26135893A JP H07112436 A JPH07112436 A JP H07112436A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- coating film
- solvent
- decomposing
- melting
- 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.)
- Withdrawn
Links
- 239000011347 resin Substances 0.000 title claims abstract description 130
- 229920005989 resin Polymers 0.000 title claims abstract description 130
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000001172 regenerating effect Effects 0.000 title description 2
- 239000011248 coating agent Substances 0.000 claims abstract description 96
- 238000000576 coating method Methods 0.000 claims abstract description 96
- 239000002904 solvent Substances 0.000 claims abstract description 48
- 238000002844 melting Methods 0.000 claims abstract description 28
- 230000008018 melting Effects 0.000 claims abstract description 28
- 238000004898 kneading Methods 0.000 claims abstract description 27
- 238000000354 decomposition reaction Methods 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 18
- 238000004064 recycling Methods 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims 1
- 230000000704 physical effect Effects 0.000 abstract description 5
- 230000006866 deterioration Effects 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 239000004743 Polypropylene Substances 0.000 description 11
- 229920001155 polypropylene Polymers 0.000 description 11
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 230000002441 reversible effect Effects 0.000 description 9
- WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical compound [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 description 8
- 239000002994 raw material Substances 0.000 description 6
- 230000007935 neutral effect Effects 0.000 description 4
- -1 Polypropylene Polymers 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N urethane group Chemical group NC(=O)OCC JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- 239000004636 vulcanized rubber Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010299 mechanically pulverizing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920006124 polyolefin elastomer Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000005809 transesterification reaction Methods 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
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- 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)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は表面に塗膜が形成された
樹脂部品を再生する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recycling resin parts having a coating film formed on the surface thereof.
【０００２】[0002]
【従来の技術】近年、公害防止、資源の有効利用を目的
として、廃棄物例えば樹脂部品を再生して利用すること
が要望されている。従来、樹脂部品のうちでも表面に塗
膜が形成された樹脂部品を再生するには、以下のように
して塗膜を剥離する方法が用いられている。2. Description of the Related Art In recent years, it has been demanded to recycle wastes such as resin parts for the purpose of preventing pollution and effectively using resources. Conventionally, among resin parts, in order to regenerate a resin part having a coating film formed on its surface, a method of peeling the coating film is used as follows.
【０００３】（１）塗膜が付いた樹脂部品の粉砕材を押
出機から押し出し、フィルターで塗膜を採取する方法。 （２）溶剤を用いて塗膜付き樹脂部品から塗膜を剥離す
る方法。(1) A method of extruding a crushed material of a resin part having a coating film from an extruder and collecting the coating film with a filter. (2) A method of peeling a coating film from a coated resin part using a solvent.
【０００４】（３）金属片、水などを塗膜付き樹脂部品
の表面に当てて塗膜を剥離する方法。 （４）また、塗膜付きの樹脂部品を対象にしたものでは
ないが、複合材を機械的に粉砕した後、分級する方法も
知られている（例えば特開平３−２３９０９号、特開平
３−３０８７７号）。(3) A method of applying a metal piece, water or the like to the surface of a resin part with a coating film to peel off the coating film. (4) Further, although not intended for resin parts with a coating film, a method of mechanically pulverizing a composite material and then classifying the composite material is also known (for example, JP-A-3-23909 and JP-A-3-3909). -30877).
【０００５】[0005]
【発明が解決しようとする課題】しかし、上述した従来
の技術にはいずれも問題がある。（１）の方法では、フ
ィルターのメッシュを細かくすると、ある程度塗膜を回
収できるが、生産性が極めて低くなる。However, all of the above-mentioned conventional techniques have problems. In the method (1), if the filter mesh is made fine, the coating film can be recovered to some extent, but the productivity becomes extremely low.
【０００６】（２）の方法では、塗膜を良好に剥離する
ことができるが、本質的にバッチ処理であり、後工程と
して別途に乾燥・押し出しが必要になり、長時間を要す
る。（３）の方法では、塗膜付き樹脂部品が一定の大き
さ（例えば１５０×５０角以上）でなければ塗膜の剥離
に長時間を要する。According to the method (2), the coating film can be satisfactorily peeled off, but it is essentially a batch process and requires separate drying and extrusion as a post process, which requires a long time. In the method (3), if the resin part with a coating film has a certain size (for example, 150 × 50 squares or more), it takes a long time to peel off the coating film.
【０００７】（４）の方法では、一般的な塗膜と樹脂基
材とでは比重などの性質にほとんど差がないため両者を
分離することは困難である。このため、再生された樹脂
は元の樹脂と比較して機械的物性などが劣り、塗膜付き
樹脂部品の再生方法としては不適当である。本発明の目
的は、塗膜付き樹脂部品から高い生産性で元の樹脂と比
較して機械的物性などの劣化が少ない樹脂を再生できる
方法を提供することにある。In the method (4), it is difficult to separate the general coating film and the resin base material from each other because there is almost no difference in properties such as specific gravity. Therefore, the regenerated resin is inferior in mechanical properties to the original resin and is not suitable as a method of regenerating a resin part with a coating film. An object of the present invention is to provide a method capable of recycling a resin part with a coating film with high productivity and having less deterioration of mechanical properties and the like as compared with the original resin.
【０００８】[0008]
【課題を解決するための手段と作用】本発明の塗膜付き
樹脂部品の再生方法は、塗膜分解部及び樹脂溶融部を有
する押出機を用い、該押出機に塗膜付き樹脂部品を供給
して前記塗膜分解部において塗膜付き樹脂部品の塗膜を
溶剤により分解して微細化し、前記樹脂溶融部において
樹脂を溶融するとともに溶剤を除去した後、樹脂及び微
細化した塗膜の混練物を押し出して樹脂を再生すること
を特徴とするものである。Means and Actions for Solving the Problems A method for recycling a resin part with a coating film according to the present invention uses an extruder having a coating film decomposition part and a resin melting part, and supplies the resin part with a coating film to the extruder. Then, the coating film of the resin part with the coating film is decomposed by the solvent in the coating film decomposition portion to be finely divided, and the resin is melted in the resin melting portion and the solvent is removed, and then the resin and the finely divided coating film are kneaded. It is characterized in that an object is extruded to regenerate the resin.
【０００９】本発明の方法は、従来の方法のように樹脂
部品から塗膜を剥離するものではなく、塗膜を分解して
樹脂の機械的物性などに悪影響を及ぼさない程度にまで
微細化することにより、再度利用可能な樹脂を再生する
ものである。また、本発明の各工程は１つの押出機中で
行われるので、生産性が高い。The method of the present invention does not separate the coating film from the resin part like the conventional method, but decomposes the coating film into fine particles to such an extent that the mechanical properties of the resin are not adversely affected. By doing so, the reusable resin is regenerated. Moreover, since each step of the present invention is performed in one extruder, the productivity is high.
【００１０】以下、本発明をさらに詳細に説明する。本
発明の方法の処理対象としては、例えば樹脂基材がＰＰ
（ポリプロピレン）、変性ＰＰ、ＥＰＤ（オレフィン系
エラストマー）などのオレフィン系樹脂からなり、塗膜
がウレタン系、アクリル系であるものが挙げられるが、
これらに限定されるものではない。The present invention will be described in more detail below. The object to be treated by the method of the present invention is, for example, a resin base material of PP.
(Polypropylene), modified PP, EPD (olefin-based elastomer) and other olefin-based resins, and the coating film is urethane-based or acrylic-based.
It is not limited to these.
【００１１】本発明においては、塗膜分解部及び樹脂溶
融部を有する押出機が用いられる。塗膜分解部、樹脂溶
融部などの各ゾーンは、スクリュエレメントと樹脂の移
動を制御するニーディングディスクとを組み合わせるこ
とにより区画することができる。例えば、順ねじれ（順
送り）ニーディングディスクと逆ねじれ（逆送り）ニー
ディングディスクとの間に塗膜分解部を形成し、塗膜分
解部以前の樹脂供給部及び塗膜分解部以後の樹脂溶融部
から区画することができる。In the present invention, an extruder having a coating film decomposition portion and a resin melting portion is used. Each zone such as the coating film decomposition portion and the resin melting portion can be partitioned by combining a screw element and a kneading disk that controls the movement of the resin. For example, a coating film decomposition part is formed between a forward twisting (forward feed) kneading disc and a reverse twisting (reverse feed) kneading disc, and the resin supply part before the coating film decomposition part and the resin melting after the coating film decomposition part Can be compartmentalized.
【００１２】本発明において、塗膜分解部に供給される
塗膜を分解するための溶剤は、樹脂基材を分解せず、塗
膜のみを選択的に分解するものである。例えば、金属水
酸化物又は金属アルコラートの水溶液又はアルコール溶
液、より具体的には、ＮａＯＨ／水、ＮａＯＨ／ＣＨ3
ＯＨ、ＣＨ3 ＯＮａ／ＣＨ3 ＯＨなどが挙げられる。水
酸化ナトリウムやナトリウムメチラートは、加水分解及
びエステル交換反応により、塗膜中のウレタン結合及び
エステル結合を開裂させるので、塗膜は分解して低分子
量の化合物となり微細化する。一方、ＰＰ、変性ＰＰ、
ＥＰＤなどのオレフィン系樹脂からなる基材は、水酸化
ナトリウム、ナトリウムメチラート、メタノールに対し
て耐性をもっており分解することはない。このほか、Ｎ
−メチルピロリドンは塗膜を膨潤させて押出機中で塗膜
を微細化する作用を有する。In the present invention, the solvent for decomposing the coating film supplied to the coating film decomposing portion selectively decomposes only the coating film without decomposing the resin substrate. For example, an aqueous solution or alcohol solution of a metal hydroxide or a metal alcoholate, more specifically, NaOH / water, NaOH / CH 3
OH, such as CH 3 ONa / CH 3 OH, and the like. Sodium hydroxide and sodium methylate cleave the urethane bond and the ester bond in the coating film by hydrolysis and transesterification reaction, so that the coating film is decomposed to become a low molecular weight compound and is miniaturized. On the other hand, PP, modified PP,
A base material made of an olefin resin such as EPD has resistance to sodium hydroxide, sodium methylate and methanol and does not decompose. Besides this, N
-Methylpyrrolidone has the function of swelling the coating and making it finer in the extruder.
【００１３】各溶剤中の溶質の濃度は、高濃度であるほ
ど塗膜の分解に有利であり、この観点からは例えばメタ
ノールへの各溶質の飽和溶解度に設定することもでき
る。ただし、水酸化ナトリウムやナトリウムメチラート
は劇物であり、極力低濃度で使用することが要求され、
０．５ｗｔ％以上でできるだけ低濃度であることが望ま
しく、具体的には３〜１０ｗｔ％の範囲がより好まし
い。樹脂と溶剤との割合は、重量比で樹脂／溶剤＝９５
／５〜５／９５の範囲が望ましく、具体的には９５／５
〜６０／４０とすることが好ましい。この割合の限定理
由も、溶剤中の溶質の濃度に関する限定理由と同じ理由
である。The higher the concentration of the solute in each solvent is, the more advantageous it is for the decomposition of the coating film. From this viewpoint, for example, the saturated solubility of each solute in methanol can be set. However, sodium hydroxide and sodium methylate are deleterious substances, and it is required to use as low concentration as possible,
It is desirable that the concentration is as low as possible at 0.5 wt% or more, and specifically, the range of 3 to 10 wt% is more preferable. The ratio of resin and solvent is resin / solvent = 95 by weight ratio.
The range of / 5 to 5/95 is desirable, and specifically 95/5
It is preferably set to 60/40. The reason for limiting this ratio is the same as the reason for limiting the concentration of the solute in the solvent.
【００１４】塗膜分解部（溶剤）の温度は、樹脂基材の
溶融温度以下、具体的には約１００℃以下に設定する。
これは、塗膜分解部で樹脂基材が溶融すると、塗膜が樹
脂中に混入し、塗膜を分解することが困難になるためで
ある。なお、溶剤の温度が高いほど塗膜の分解に有利で
あるため、樹脂基材の溶融温度以下でできるだけ高温に
することが好ましい。The temperature of the coating film decomposing portion (solvent) is set below the melting temperature of the resin substrate, specifically below about 100 ° C.
This is because when the resin base material melts in the coating film decomposition portion, the coating film mixes into the resin and it becomes difficult to decompose the coating film. Since the higher the temperature of the solvent is, the more advantageous the decomposition of the coating film is, it is preferable to set the temperature as high as possible below the melting temperature of the resin substrate.
【００１５】このように押出機の塗膜分解部に塗膜を分
解する溶剤を封入し、押出機中で樹脂に加えられるせん
断力と溶剤の分解力により塗膜を分解する。この段階で
塗膜の大きさは５０μｍ以下、通常は数μｍ〜十数μｍ
になる。この段階で分解した塗膜の大きさが５０μｍを
超えると、最終的に得られる再生樹脂の外観や機械的物
性などが劣る。Thus, the solvent for decomposing the coating film is enclosed in the coating film decomposing portion of the extruder, and the coating film is decomposed by the shearing force applied to the resin in the extruder and the decomposing force of the solvent. At this stage, the size of the coating film is 50 μm or less, usually several μm to ten and several μm.
become. When the size of the coating film decomposed at this stage exceeds 50 μm, the appearance and mechanical properties of the finally obtained recycled resin are poor.
【００１６】本発明においては、樹脂溶融部で樹脂を溶
融するとともに溶剤を除去した後、さらにダイから樹脂
及び微細化した塗膜の混練物を押し出して樹脂を再生す
る。樹脂溶融部の温度は、通常の押出成形時の条件と同
様であり、例えば変性ＰＰの場合には約２２０℃に設定
する。また、溶剤を除去するには、真空ポンプにより真
空ベントから真空引きする。In the present invention, the resin is regenerated by melting the resin in the resin melting portion and removing the solvent, and then extruding the kneaded product of the resin and the finely divided coating film from the die. The temperature of the resin melting portion is the same as the condition during normal extrusion molding, and is set to about 220 ° C. in the case of modified PP, for example. To remove the solvent, the vacuum vent is evacuated by a vacuum pump.
【００１７】以上のような本発明の方法では、塗膜分解
部で樹脂を溶融させずに塗膜を分解して微細化させた
後、樹脂溶融部において樹脂を溶融するとともに溶剤を
除去した後、樹脂及び微細化した塗膜の混練物を押し出
して樹脂を再生する。このような方法で再生された樹脂
中には、非常に微細に分解された塗膜が均一に混練され
ている。微細化された塗膜は特定の作用を示さない添加
物として再生樹脂中に含有されているとみなすことがで
き、塗膜の微粒子が再生樹脂の機械的物性、塗装性に与
える影響は小さい。In the method of the present invention as described above, after the coating film is decomposed into fine particles by not melting the resin in the film decomposition portion, the resin is melted in the resin melting portion and the solvent is removed. The resin and the resin are regenerated by extruding the kneaded product of the resin and the finely divided coating film. A very finely decomposed coating film is uniformly kneaded in the resin regenerated by such a method. The finely divided coating film can be regarded as being contained in the recycled resin as an additive having no specific action, and the fine particles of the coating film have little influence on the mechanical properties and coatability of the recycled resin.
【００１８】一方、塗膜付き樹脂部品の粉砕材を本発明
のような塗膜分解部のない通常の押出機を用いて押出成
形した場合、再生樹脂中に１〜２ｍｍの大きさの塗膜片
が混入し、元の樹脂と比較して機械的物性などが大幅に
低下する。On the other hand, when the crushed material of the resin part with a coating film is extrusion-molded by using an ordinary extruder having no coating film decomposing portion as in the present invention, a coating film having a size of 1 to 2 mm is contained in the recycled resin. Pieces are mixed in, and mechanical properties and the like are significantly reduced compared to the original resin.
【００１９】[0019]
【実施例】以下、本発明の実施例を説明する。本実施例
では塗膜付き樹脂部品としての自動車バンパーから樹脂
を再生した。用いた自動車バンパーは、基材が変性ポリ
プロピレン（ポリプロピレン（ＰＰ）とエチレン・プロ
ピレン・ゴム（ＥＰＲ）とをブレンドしたグレード、厚
さ３〜５ｍｍ）からなり、塗膜がＰＰ系プライマ上に２
液ウレタン系塗料を上塗りしたもの（厚さ３５〜５０μ
ｍ）からなっている。EXAMPLES Examples of the present invention will be described below. In this example, the resin was regenerated from an automobile bumper as a resin part with a coating film. The automobile bumper used had a base material of modified polypropylene (a grade in which polypropylene (PP) and ethylene propylene rubber (EPR) were blended, and a thickness of 3 to 5 mm), and a coating film was formed on a PP-based primer.
Liquid urethane-based paint overcoated (thickness 35 to 50μ
m).
【００２０】塗膜を分解するための溶剤として、ナトリ
ウムメチラートのメタノール溶液を使用し、濃度を重量
で溶質／溶媒＝５／９５〜１０／９０とした。本実施例
では図１に示す二軸押出機を用いた。この二軸押出機
は、モータ１及び減速機２などからなる押出機駆動装置
に、内部にスクリュを備えたスクリュシリンダ３を取り
付け、その先端にダイ４を取り付けた構造を有する。ス
クリュのＬ／Ｄは３５である。ここで、説明を簡単にす
るためにスクリュシリンダ３を構成するセグメントをＣ
１〜Ｃ１０で示す。スクリュシリンダ３のセグメントＣ
１には、原料フィーダ５からホッパ６を介して自動車バ
ンパーを粗粉砕した原料が供給される。セグメントＣ３
にはオープンベント７が設けられている。セグメントＣ
５には液添ポンプ８から溶剤供給口９を介して溶剤が供
給される。セグメントＣ９には真空ベント１０が設けら
れており、真空ポンプ（図示せず）に接続されている。
スクリュシリンダ３を構成する各セグメントの周囲に
は、内部の樹脂を所定温度に設定するための通常のヒー
タ（図示せず）が設けられている。また、ダイ４の前方
には、ダイ４から押し出されたストランドを冷却するバ
ス及びペレタイザなどの通常の機器が設けられている。A methanol solution of sodium methylate was used as a solvent for decomposing the coating film, and the concentration was solute / solvent = 5/95 to 10/90 by weight. In this example, the twin-screw extruder shown in FIG. 1 was used. This twin-screw extruder has a structure in which a screw cylinder 3 having a screw inside is attached to an extruder driving device including a motor 1 and a speed reducer 2, and a die 4 is attached to the tip thereof. The L / D of the screw is 35. Here, in order to simplify the description, the segment forming the screw cylinder 3 is referred to as C
It shows with 1-C10. Segment C of screw cylinder 3
A raw material obtained by coarsely crushing an automobile bumper is supplied from a raw material feeder 5 through a hopper 6. Segment C3
An open vent 7 is provided in the. Segment C
A solvent is supplied to 5 from a liquid addition pump 8 through a solvent supply port 9. A vacuum vent 10 is provided in the segment C9 and is connected to a vacuum pump (not shown).
Around each segment that constitutes the screw cylinder 3, a normal heater (not shown) for setting the internal resin to a predetermined temperature is provided. Further, in front of the die 4, usual equipment such as a bath and a pelletizer for cooling the strands extruded from the die 4 are provided.
【００２１】この二軸押出機のスクリュの概略構成を図
２を参照して説明する。このスクリュ１１は、フルフラ
イト形スクリュエレメント１２と各種のニーディングデ
ィスクとを組み合わせたものである。すなわち、Ｃ１か
らＣ２の途中までフルフライト形スクリュエレメント１
２、Ｃ２の途中からＣ３の途中まで順ねじれ（順送り）
ニーディングディスク１３、Ｃ３の途中からＣ６の途中
までフルフライト形スクリュエレメント１２、Ｃ６の途
中からＣ７の途中まで逆ねじれ（逆送り）ニーディング
ディスク１４、Ｃ７の途中からＣ８まで中立（直交）ニ
ーディングディスク１５、Ｃ９からＣ１０までフルフラ
イト形スクリュエレメント１２が設けられている。この
ようなスクリュー１１を用いることにより、順ねじれニ
ーディングディスク１３と逆ねじれニーディングディス
ク１４との間に塗膜分解部が形成され、逆ねじれニーデ
ィングディスク１４より前方に樹脂溶融部が形成され
る。The schematic structure of the screw of this twin-screw extruder will be described with reference to FIG. The screw 11 is a combination of a full flight type screw element 12 and various kneading discs. That is, the full flight type screw element 1 from the middle of C1 to C2
2. Forward twist from the middle of C2 to the middle of C3 (forward feed)
Kneading disc 13, from the middle of C3 to the middle of C6 Full flight type screw element 12, From the middle of C6 to the middle of C7 Reverse twist (reverse feed) Kneading disc 14, From the middle of C7 to C8 The neutral (orthogonal) knee A full-flight type screw element 12 is provided from C9 to C10 on the Ding disk 15. By using such a screw 11, a coating film decomposition portion is formed between the forward twist kneading disc 13 and the reverse twist kneading disc 14, and a resin melting portion is formed in front of the reverse twist kneading disc 14. It
【００２２】フルフライト形スクリュエレメント、順ね
じれニーディングディスク、逆ねじれニーディングディ
スク、中立ニーディングディスクの作用を図３を参照し
て簡単に説明する。図３（ａ）はフルフライト形スクリ
ュエレメント１２を示すものであり、この部位では樹脂
原料はスクリュの溝に沿って移動するだけである。図３
（ｂ）に示す順ねじれニーディングディスク１３は樹脂
を積極的に前方へ送る作用を有し、同時に塗膜分解部の
溶剤を樹脂供給部へバックフローさせないという作用も
有する。図３（ｃ）に示す逆ねじれニーディングディス
ク１４は樹脂を逆送する作用を有し、樹脂が溶剤に浸さ
れる時間（滞留時間）を長くし、溶剤が樹脂溶融部へ流
れ込むのを防止する。図３（ｄ）に示す中立ニーディン
グディスク１５は樹脂と微細化した塗膜とを十分に混練
するとともに、塗膜をより一層微細化させる作用を有す
る。The operation of the full flight type screw element, the forward twist kneading disc, the reverse twist kneading disc and the neutral kneading disc will be briefly described with reference to FIG. FIG. 3 (a) shows a full flight type screw element 12, in which the resin raw material only moves along the groove of the screw. Figure 3
The forward-twisting kneading disk 13 shown in (b) has a function of positively feeding the resin forward, and at the same time, has a function of preventing the solvent in the coating film decomposition portion from backflowing to the resin supply portion. The reverse-twisting kneading disk 14 shown in FIG. 3 (c) has a function of feeding back the resin, prolongs the time (residence time) in which the resin is immersed in the solvent, and prevents the solvent from flowing into the resin melting portion. To do. The neutral kneading disk 15 shown in FIG. 3 (d) has an effect of sufficiently kneading the resin and the finely divided coating film and further further miniaturizing the coating film.
【００２３】本発明の方法による樹脂の処理について説
明する。Ｃ１から押出機に投入できる大きさに粗粉砕さ
れた樹脂原料を供給すると、樹脂原料は順ねじれニーデ
ィングディスク１３の作用により塗膜分解部へ送られ
る。塗膜分解部には溶剤が供給され、塗膜が分解・微細
化される。オープンベント７により圧力を開放している
ので、溶剤を加熱しても塗膜分解部の圧力が上昇するこ
とはない。この塗膜分解部では樹脂基材はわずかに軟化
する程度で溶融することはない。次に、樹脂は樹脂溶融
部へ送られ、約２２０℃で溶融・混練される。この間、
塗膜分解部で微細化した塗膜はより一層微細化する。こ
の後、真空ベント１０から溶剤が除去される。最後に、
溶融樹脂がダイ４からストランドとして押し出される。
さらに、ストランドからペレットが作製される。The treatment of resin by the method of the present invention will be described. When the resin raw material roughly crushed to a size that can be charged into the extruder is supplied from C1, the resin raw material is sent to the coating film decomposition portion by the action of the forward twist kneading disk 13. The solvent is supplied to the coating film decomposition portion to decompose and miniaturize the coating film. Since the pressure is released by the open vent 7, even if the solvent is heated, the pressure in the coating film decomposition portion does not rise. In this coating film decomposed portion, the resin base material is slightly softened and does not melt. Next, the resin is sent to the resin melting section and melted and kneaded at about 220 ° C. During this time,
The coating film that has been made finer in the coating film decomposition portion becomes even finer. Then, the solvent is removed from the vacuum vent 10. Finally,
The molten resin is extruded from the die 4 as a strand.
In addition, pellets are made from the strands.
【００２４】得られたペレットから再び樹脂を成形し、
機械的物性を測定した。ここで、曲げ弾性率は、ＪＩＳ
Ｋ７１１６（プラスチックの曲げクリープ弾性方法）
に従い、高さ１〜３ｍｍ、幅２５ｍｍの試験片を作製し
て求めた。引張強さ及び破断伸びは、ＪＩＳ Ｋ６３０
１（加硫ゴム物理試験法）に従い、２号形ダンベルを使
用し、テストスピード５０ｍｍ／ｓｅｃで測定した。脆
化温度は、ＪＩＳ Ｋ６３０１（加硫ゴム物理試験法）
に従い、低温衝撃脆化試験により求めた。これらの結果
を元の樹脂（バージン材）の物性とともに表１に示す。A resin is molded again from the obtained pellets,
The mechanical properties were measured. Here, the flexural modulus is JIS
K7116 (plastic bending creep elasticity method)
According to the above, a test piece having a height of 1 to 3 mm and a width of 25 mm was prepared and determined. Tensile strength and elongation at break are JIS K630
According to No. 1 (vulcanized rubber physical test method), a No. 2 dumbbell was used and the measurement was performed at a test speed of 50 mm / sec. Brittleness temperature is JIS K6301 (vulcanized rubber physical test method)
According to the above, it was determined by a low temperature impact embrittlement test. The results are shown in Table 1 together with the physical properties of the original resin (virgin material).
【００２５】[0025]
【表１】 [Table 1]
【００２６】表１から明らかなように、バージン材及び
本実施例により再生された樹脂の各物性は誤差範囲に収
まっており、両者に物性上の差異はほとんどないといえ
る。以上のように押出機内において連続的に塗膜を微細
化し樹脂基材と混練した状態で押し出すという非常に生
産性の高い方法により、元の樹脂とほぼ同等の物性を有
する樹脂を再生することができる。As is clear from Table 1, the physical properties of the virgin material and the resin regenerated by this example are within the error range, and it can be said that there is almost no difference in physical properties between the two. As described above, it is possible to regenerate a resin having almost the same physical properties as the original resin by a very highly productive method in which the coating film is continuously refined in the extruder and extruded in a state of being kneaded with the resin base material. it can.
【００２７】なお、本発明の方法には種々の変形例が考
えられる。スクリュシリンダの長さやスクリュ形状を変
更することにより、押出機の各ゾーンの長さを変化さ
せ、各ゾーンにおける樹脂の滞留時間を調整してもよ
い。このようにすれば、塗膜分解部を長くして塗膜の分
解・微細化を確実にしたり、樹脂溶融部を長くして樹脂
の溶融・混練りを確実にすることもできる。また、樹脂
溶融部を２個所設け、それぞれの個所に真空ベントを設
けて溶剤の除去を確実にすることもできる。Various modifications of the method of the present invention are possible. By changing the length of the screw cylinder or the screw shape, the length of each zone of the extruder may be changed to adjust the residence time of the resin in each zone. By doing so, it is possible to lengthen the coating film decomposing portion to ensure decomposition and miniaturization of the coating film, and to lengthen the resin melting portion to ensure melting and kneading of the resin. It is also possible to provide two resin melting parts and provide vacuum vents at the respective positions to ensure removal of the solvent.
【００２８】なお、上記実施例では自動車用ＰＰバンパ
ーの再生について説明したが、適当な溶剤を選択するこ
とにより本発明の方法を他の塗膜付き樹脂部品の再生に
も適用できることはもちろんである。In the above example, the regeneration of the PP bumper for automobiles has been described, but it is needless to say that the method of the present invention can be applied to the regeneration of other coated resin parts by selecting an appropriate solvent. .
【００２９】[0029]
【発明の効果】以上詳述したように本発明の方法を用い
れば、追加の設備を設けることなく既存の押出機を用い
て塗膜付き樹脂部品を処理することにより、高い生産性
で元の樹脂と比較して機械的性質などの劣化が少ない樹
脂を再生できる。As described in detail above, by using the method of the present invention, it is possible to process the resin part with a coating film by using the existing extruder without providing additional equipment, thereby improving the original productivity with high productivity. It is possible to regenerate resins that have less deterioration in mechanical properties than resins.
【図１】本発明の実施例において用いられた二軸押出機
の構成図。FIG. 1 is a configuration diagram of a twin-screw extruder used in an example of the present invention.
【図２】本発明の実施例において用いられた二軸押出機
のスクリュの概略構成を説明図。FIG. 2 is an explanatory diagram showing a schematic configuration of a screw of a twin-screw extruder used in an example of the present invention.
【図３】本発明の実施例において用いられた二軸押出機
のスクリュを構成するエレメントの動作を概略的に説明
する説明図。FIG. 3 is an explanatory view for schematically explaining the operation of the elements constituting the screw of the twin-screw extruder used in the examples of the present invention.
１…モータ、２…減速機、３…スクリュシリンダ、４…
ダイ、５…原料フィーダ、６…ホッパ、７…オープンベ
ント、８…液添ポンプ、９…溶剤供給口、１０…真空ベ
ント、１１…スクリュ１１、１２…フルフライト形スク
リュエレメント、１３…順ねじれ（順送り）ニーディン
グディスク、１４…逆ねじれ（逆送り）ニーディングデ
ィスク、１５…中立（直交）ニーディングディスク。1 ... Motor, 2 ... Reducer, 3 ... Screw cylinder, 4 ...
Die, 5 ... Raw material feeder, 6 ... Hopper, 7 ... Open vent, 8 ... Liquid addition pump, 9 ... Solvent supply port, 10 ... Vacuum vent, 11 ... Screw 11, 12 ... Full flight type screw element, 13 ... Forward twist (Progressive) kneading disc, 14 ... Reverse twist (reverse feeding) kneading disc, 15 ... Neutral (orthogonal) kneading disc.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ０９Ｂ 5/00 ＺＡＢ Ｂ２９Ｃ 47/00 8016−4Ｆ Ｃ０８Ｊ 11/00 7310−4Ｆ // Ｂ２９Ｋ 105:26 Ｂ０９Ｂ 5/00 ＺＡＢ Ｑ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location B09B 5/00 ZAB B29C 47/00 8016-4F C08J 11/00 7310-4F // B29K 105: 26 B09B 5/00 ZAB Q
Claims (2)
機を用い、該押出機に塗膜付き樹脂部品を供給して前記
塗膜分解部において塗膜付き樹脂部品の塗膜を溶剤によ
り分解して微細化し、前記樹脂溶融部において樹脂を溶
融するとともに溶剤を除去した後、樹脂及び微細化した
塗膜の混練物を押し出して樹脂を再生することを特徴と
する塗膜付き樹脂部品の再生方法。1. An extruder having a coating film decomposing portion and a resin melting portion is used, and a resin component with a coating film is fed to the extruder to coat the coating film of the resin component with a coating film with a solvent in the decomposing portion of the coating film. Of the resin component with a coating, characterized in that the resin is regenerated by decomposing and refining, melting the resin in the resin melting portion and removing the solvent, and then extruding the kneaded product of the resin and the refined coating. How to play.
成された樹脂部品の再生方法であって、上記樹脂部品を
所定寸法以下に粉砕された粉砕樹脂を投入する粉砕樹脂
投入部と、上記樹脂基材の溶融温度以下の所定温度に設
定されると共に上記塗膜のみを分解せしめる溶剤を供給
せしめる溶剤供給手段に接続された塗膜分解部と、上記
樹脂基材の溶融温度以上の所定温度に設定された樹脂基
材溶融部と、上記塗膜分解部で供給された溶剤を除去す
べく溶剤除去手段に接続された溶剤除去部と、上記各部
を経て混練された混練物を押し出すダイ部とが押し出し
方向に設定された多軸押出機を使用し、上記粉砕樹脂投
入部へ塗膜付き樹脂部品を粉砕した粉砕樹脂を投入する
粉砕樹脂投入工程と、上記塗膜分解部において塗膜のみ
を同押出機による混練作用により上記粉砕樹脂に加えら
れるせん断力と上記溶剤供給手段より供給された溶剤の
分解力により塗膜を分解する塗膜分解工程と、上記樹脂
溶融部において上記粉砕樹脂の基材樹脂を熱溶融させる
と共に熱溶融した基材樹脂中に上記塗布膜分解工程で分
解されて微細化した塗膜を混練する樹脂基材溶融工程
と、上記溶剤除去部において上記塗膜分解工程で供給さ
れた溶剤を上記溶剤除去手段により除去せしめる溶剤除
去工程と、上記溶剤除去工程で上記溶剤が除去された混
練樹脂を上記ダイを介して所定形状に押し出す押出工程
とを上記単一の多軸押出機により行うことを特徴とする
塗膜付き樹脂製品の再生方法。2. A method of recycling a resin base material and a resin component having a coating film formed on the surface of the resin base material, wherein the resin component is charged with a crushed resin crushed to a predetermined size or less. Part, a coating film decomposition part connected to a solvent supply means for supplying a solvent that decomposes only the coating film and is set to a predetermined temperature equal to or lower than the melting temperature of the resin base material, and the melting temperature of the resin base material. The resin base material melting part set to the above predetermined temperature, the solvent removing part connected to the solvent removing means for removing the solvent supplied in the coating film decomposing part, and the kneaded product kneaded through the respective parts Using a multi-screw extruder in which the die part for pushing out is set in the extrusion direction, a crushed resin charging step of charging a crushed resin obtained by crushing a resin part with a coating into the crushed resin charging part, and the coating film decomposition part At this time, only the coating film was mixed by the same extruder. A coating film decomposing step of decomposing the coating film by the shearing force applied to the pulverized resin by the kneading action and the decomposing force of the solvent supplied from the solvent supply means, and heat the base resin of the pulverized resin in the resin melting part. A resin base material melting step of kneading a finely divided coating film that is decomposed in the coating film decomposition step in a base material resin that is melted and heat-melted, and a solvent supplied in the coating film decomposition step in the solvent removal section. Is carried out by the single multi-screw extruder and a solvent removing step of removing the solvent by the solvent removing means, and an extrusion step of extruding the kneaded resin from which the solvent is removed in the solvent removing step into a predetermined shape through the die. A method for recycling a resin product with a coating, which is characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26135893A JPH07112436A (en) | 1993-10-19 | 1993-10-19 | Regenerating method of coated resin component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26135893A JPH07112436A (en) | 1993-10-19 | 1993-10-19 | Regenerating method of coated resin component |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07112436A true JPH07112436A (en) | 1995-05-02 |
Family
ID=17360739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26135893A Withdrawn JPH07112436A (en) | 1993-10-19 | 1993-10-19 | Regenerating method of coated resin component |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07112436A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07124945A (en) * | 1993-10-29 | 1995-05-16 | Toyota Motor Corp | Reclamation method and device for resin waste material |
| EP0739701A3 (en) * | 1995-04-28 | 1997-07-23 | Toyota Motor Co Ltd | Process for recycling resin covered with paint film |
| JP2024005256A (en) * | 2022-06-30 | 2024-01-17 | 東洋インキＳｃホールディングス株式会社 | Method for producing recycled plastic |
-
1993
- 1993-10-19 JP JP26135893A patent/JPH07112436A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07124945A (en) * | 1993-10-29 | 1995-05-16 | Toyota Motor Corp | Reclamation method and device for resin waste material |
| EP0739701A3 (en) * | 1995-04-28 | 1997-07-23 | Toyota Motor Co Ltd | Process for recycling resin covered with paint film |
| JP2024005256A (en) * | 2022-06-30 | 2024-01-17 | 東洋インキＳｃホールディングス株式会社 | Method for producing recycled plastic |
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