JPH05220440A - Removal of film - Google Patents
Removal of filmInfo
- Publication number
- JPH05220440A JPH05220440A JP2836292A JP2836292A JPH05220440A JP H05220440 A JPH05220440 A JP H05220440A JP 2836292 A JP2836292 A JP 2836292A JP 2836292 A JP2836292 A JP 2836292A JP H05220440 A JPH05220440 A JP H05220440A
- Authority
- JP
- Japan
- Prior art keywords
- coating film
- substrate
- present
- aqueous
- stripping solution
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、塗膜の除去方法に関
し、特にポリオレフィン基体の表面に形成された硬化塗
膜を、環境上問題がある有機溶媒を使用せずに、取扱が
容易な水性剥離液を使用して従来法によるよりも短時間
で容易に剥離できる方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing a coating film, and particularly to a cured coating film formed on the surface of a polyolefin substrate, which is easy to handle without using an organic solvent which is environmentally problematic. The present invention relates to a method of using a stripping solution, which can be stripped easily in a shorter time than the conventional method.
【０００２】[0002]
【従来の技術】一般に、樹脂成形品は、金属製品、ガラ
ス製品などに比較し、軽量で耐衝撃性に優れているばか
りでなく、安価で成形加工が容易であるなどの利点を有
しており、自動車、家庭電化製品、日用雑貨品、その他
の多くの分野で使用されている。特に自動車業界におい
ては車体重量の軽量化を図るため、年々車体に占める樹
脂製部品の点数が増加の傾向にある。2. Description of the Related Art Generally, resin molded products have advantages such as light weight and excellent impact resistance as compared with metal products and glass products, as well as low cost and easy molding process. It is used in automobiles, home appliances, household goods, and many other fields. Particularly in the automobile industry, the number of resin parts occupying the vehicle body tends to increase year by year in order to reduce the weight of the vehicle body.
【０００３】これら樹脂成形品の多くは、耐食・耐候性
能の向上、製品美観向上の手段として塗装が施される。
この塗料には、樹脂成形品との接着性、塗膜自身の性能
の面から三次元架橋構造を形成する材料が多く用いられ
る。しかし、この優れた塗膜性能が故に、なんらかの理
由により塗膜を剥離させる必要が生じた場合、強固な架
橋構造を持つ塗膜は容易には剥離されない。Many of these resin molded products are coated as a means for improving corrosion resistance and weather resistance and improving product aesthetics.
For this paint, a material that forms a three-dimensional crosslinked structure is often used in terms of the adhesiveness to the resin molded product and the performance of the coating film itself. However, due to this excellent coating performance, when it is necessary to peel the coating for some reason, the coating having a strong crosslinked structure is not easily peeled.
【０００４】塗膜の剥離は、塗装工程に不良が発生した
場合や、性能の劣化した旧塗膜を新塗膜に置き換える場
合、被塗装樹脂成形品の樹脂基材のみを再利用する場合
など多くの場面で必要とされ、産業上重要な技術であ
る。Peeling of a coating film occurs when a defect occurs in the coating process, when an old coating film having deteriorated performance is replaced with a new coating film, or when only a resin base material of a resin molded product to be coated is reused. It is an industrially important technology that is required in many situations.
【０００５】ところで、従来行なわれてきた塗膜の剥
離、除去方法は物理的剥離、化学的剥離に大別される。
この内、物理的剥離はサンドペ−パ−等で塗膜を削る方
法である。By the way, the conventional methods of peeling and removing the coating film are roughly classified into physical peeling and chemical peeling.
Of these, physical peeling is a method of scraping the coating film with a sandpaper or the like.
【０００６】化学的剥離は大略次に挙げる３つに分けら
れる。 １）塩素系溶剤を主成分とする剥離剤による除去（特公
昭５１−３４２３８号公報、同５７−７６０６５号公
報、同５９−１１７５６７号公報） ２）有機物質を主成分とする剥離剤による除去（特開昭
５７−１９０６７５号公報、特開平１−２８９８７８号
公報、同２−２７４７７５号公報） ３）無機物質を主成分とする剥離剤による除去（特開昭
５０−１０９９２５号公報、同５９−１３１６７４号公
報、同６１−１６２５６８号公報） また、その他上記の３種の剥離剤の主成分を任意に混合
してなる剥離剤、また、これらに他の成分を任意に混合
してなる剥離剤を使用する除去方法もある。The chemical peeling can be roughly divided into the following three types. 1) Removal with a stripping agent containing a chlorine-based solvent as a main component (JP-B-51-34238, 57-76065 and 59-117567) 2) Removal with a stripping agent containing an organic substance as a main component (JP-A-57-190675, JP-A-1-289878, JP-A-2-274775) 3) Removal by a release agent containing an inorganic substance as a main component (JP-A-50-109925, 59) In addition, a release agent obtained by arbitrarily mixing the main components of the above-mentioned three types of release agents, and a release agent obtained by arbitrarily mixing these with other components. There is also a removal method using an agent.
【０００７】[0007]
【発明が解決しようとする課題】しかし、物理的剥離に
よる方法は、基体に傷が付いたり、大量に塗膜を剥離す
る場合かなり能率の悪い方法である。化学的剥離による
方法においては、１）の方法での剥離剤はいずれも優れ
た剥離性能を持つが、基体によっては剥離剤がこれを腐
食するおそれがある。また、塩素系溶剤が人体に悪影響
を及ぼすことは周知であり、環境保全の立場からもこれ
らの塩素系溶剤の使用に対する規制は年々厳しいものと
なり、将来的にこれらの塩素系溶剤の使用は困難であ
る。２）の方法で使用される有機物質は、各種アルコー
ル、アミン系化合物等であり、１）の方法での塩素系溶
剤と同様に環境および人体に悪影響を与えるおそれがあ
る。３）の方法における剥離剤は、酸、アルカリ、金属
塩等を主成分とするものが多く、アルカリ物質などの含
有量が多く作業性に難がありかつ人体に害を与えるこ
と、剥離に要する時間が長いことなどの欠点がある。ま
た、化学的剥離による方法に共通する問題として、塗膜
剥離後の使用済み剥離剤の処理を環境等に配慮して慎重
に行わなければならない問題がある。However, the physical peeling method is a very inefficient method when the substrate is scratched or a large amount of the coating film is peeled off. In the method using chemical peeling, all of the peeling agents used in the method 1) have excellent peeling performance, but the peeling agent may corrode this depending on the substrate. In addition, it is well known that chlorine-based solvents have an adverse effect on the human body, and regulations on the use of these chlorine-based solvents are becoming stricter year by year from the standpoint of environmental conservation, making it difficult to use these chlorine-based solvents in the future. Is. The organic substances used in the method 2) are various alcohols, amine compounds and the like, and like the chlorine solvent used in the method 1), there is a possibility that they may adversely affect the environment and the human body. Many of the stripping agents in the method 3) are mainly composed of acids, alkalis, metal salts, etc., and have a large amount of alkaline substances and the like, which is difficult to work with and harms the human body, and is required for stripping. There are drawbacks such as long time. Further, as a problem common to the chemical peeling method, there is a problem that the treatment of the used peeling agent after peeling the coating film must be carefully performed in consideration of the environment and the like.
【０００８】そこで本発明の目的は、有機溶媒を使用せ
ずに、取扱が容易な低アルカリ濃度の水性剥離液を使用
して従来法によるよりも短時間で硬化塗膜を容易に剥離
でき、しかも繰り返し水性剥離液を使用することができ
る塗膜の除去方法を提供することにある。Therefore, an object of the present invention is to easily remove a cured coating film in a shorter time than in the conventional method by using an aqueous stripping solution having a low alkali concentration which is easy to handle without using an organic solvent, Moreover, it is an object of the present invention to provide a method for removing a coating film, which can repeatedly use an aqueous stripping solution.
【０００９】[0009]
【課題を解決するための手段】本発明は、前記課題を解
決するために、表面に硬化塗膜を有するポリオレフィン
基体を、アルカリ性物質を０．１〜５重量％含む水性剥
離液を用いて１００〜１７０℃で処理する工程を有する
塗膜の除去方法を提供するものである。In order to solve the above-mentioned problems, the present invention provides a polyolefin substrate having a cured coating film on the surface thereof by using an aqueous stripper containing 0.1 to 5% by weight of an alkaline substance. The present invention provides a method for removing a coating film, which has a step of treating at 170 ° C.
【００１０】前記水性剥離液が、アルカリ性物質を０．
２〜４重量％含むものであると、好ましい。The above-mentioned aqueous stripping solution contains an alkaline substance in an amount of 0.
It is preferable that the content is 2 to 4% by weight.
【００１１】前記アルカリ性物質が、水酸化リチウム、
水酸化ナトリウム、水酸化カリウム、水酸化マグネシウ
ムおよび水酸化カルシウムから選ばれる少なくとも１種
であると、好ましい。The alkaline substance is lithium hydroxide,
It is preferably at least one selected from sodium hydroxide, potassium hydroxide, magnesium hydroxide and calcium hydroxide.
【００１２】また、本発明は、前記ポリオレフィンが、
ポリプロピレンである場合に、特に有効である。The present invention also provides that the above-mentioned polyolefin is
It is particularly effective when it is polypropylene.
【００１３】以下、本発明の塗膜の除去方法（以下、
「本発明の方法」と略す）について詳細に説明する。Hereinafter, the method for removing a coating film of the present invention (hereinafter, referred to as
The “method of the present invention” is abbreviated).
【００１４】本発明の方法は、ポリオレフィン基体の表
面に形成された硬化塗膜を除去する方法である。このポ
リオレフィン基体を構成するポリオレフィンは、特に制
限されず、α−オレフィンの単独重合体；２種以上のα
−オレフィンの共重合体；これらの重合体または共重合
体の変性物；あるいはこれらの重合体または共重合体
と、他の極性基を有する重合体との組成物などが挙げら
れる。α−オレフィンとしては、例えば、エチレン、プ
ロピレン、１−ブテン、１−ペンテン、２−メチル−１
−ブテン、３−メチル−１−ブテン、１−ヘキセン、４
−メチル１−１ペンテン、３−メチル−１−ペンテン、
２−メチル−１−ペンテン、１−ヘプテン、４−メチル
−１−ヘキセン、１−オクテン、５−メチル−１−ヘプ
テン、１−デセン等が挙げられる。これらのα−オレフ
ィンからなるポリオレフィンの具体例として、ポリエチ
レン、ポリプロピレン、ポリブテン、ポリ４−メチル−
１−ペンテン等が挙げられる。The method of the present invention is a method of removing a cured coating film formed on the surface of a polyolefin substrate. The polyolefin constituting the polyolefin substrate is not particularly limited, and is a homopolymer of α-olefin; two or more types of α
-Olefin copolymers; modified products of these polymers or copolymers; or compositions of these polymers or copolymers with other polar group-containing polymers. Examples of the α-olefin include ethylene, propylene, 1-butene, 1-pentene, and 2-methyl-1.
-Butene, 3-methyl-1-butene, 1-hexene, 4
-Methyl-1-pentene, 3-methyl-1-pentene,
2-methyl-1-pentene, 1-heptene, 4-methyl-1-hexene, 1-octene, 5-methyl-1-heptene, 1-decene and the like can be mentioned. Specific examples of the polyolefin composed of these α-olefins include polyethylene, polypropylene, polybutene, poly-4-methyl-
1-Pentene and the like can be mentioned.
【００１５】また、α−オレフィンの単独重合体または
２種以上のα−オレフィンの共重合体の変性物として
は、これらの単独重合体または共重合体を、マレイン
酸、フマル酸、シトラコン酸、イタコン酸、ハイミック
酸等の不飽和カルボン酸、およびこれらの不飽和カルボ
ン酸の無水物、アルキルエステル等をグラフト共重合さ
せて変性したものなどが挙げられる。As a modified product of an α-olefin homopolymer or a copolymer of two or more α-olefins, maleic acid, fumaric acid, citraconic acid, a homopolymer of these homopolymers or copolymers, Examples thereof include unsaturated carboxylic acids such as itaconic acid and hymic acid, and anhydrides and alkyl esters of these unsaturated carboxylic acids modified by graft copolymerization.
【００１６】さらに、これらの単独重合体または共重合
体と混合される極性基を有する重合体としては、α−オ
レフィンと極性基含有モノマーの共重合体、例えば、エ
チレン・酢酸ビニル共重合体、エチレン（メタ）アクリ
ル酸およびエステル共重合体、エチレン・ビニルアルコ
ール共重合体等が挙げられる。Further, as the polymer having a polar group mixed with these homopolymers or copolymers, a copolymer of α-olefin and a polar group-containing monomer, for example, ethylene / vinyl acetate copolymer, Examples thereof include ethylene (meth) acrylic acid and ester copolymers and ethylene / vinyl alcohol copolymers.
【００１７】これらのポリオレフィンからなる基体の中
でも、特にポリプロピレンからなる成形品が基体である
場合に、その基体の表面の硬化塗膜を除去するに際し
て、基体に何らの損傷を与えず、しかも処理の前後で物
性が低下することがないため、本発明の方法は有効であ
る。Among the substrates made of these polyolefins, particularly when a molded product made of polypropylene is the substrate, when the cured coating film on the surface of the substrate is removed, the substrate is not damaged at all, and the treatment is performed. The method of the present invention is effective because the physical properties do not deteriorate before and after.
【００１８】また、本発明の方法は、ポリオレフィン基
体の形状、寸法等に制限されず、いずれのポリオレフィ
ン基体にも適用できる。Further, the method of the present invention is not limited to the shape and size of the polyolefin substrate and can be applied to any polyolefin substrate.
【００１９】本発明の方法によって剥離される硬化塗膜
は、フェノ−ル系塗料、ポリエステル系塗料、アルキッ
ド系塗料、アクリル系塗料、ポリウレタン系塗料、エポ
キシ系塗料等の塗料を塗布して硬化されてなるものが挙
げられる。特に、自動車の塗装に用いられるポリエステ
ルウレタン、ポリエステルメラミン、アクリルウレタ
ン、アクリルメラミン等からなる硬化塗膜を剥離するの
に、本発明の方法は好適である。The cured coating film peeled by the method of the present invention is cured by applying a coating material such as a phenol coating material, a polyester coating material, an alkyd coating material, an acrylic coating material, a polyurethane coating material or an epoxy coating material. There is a thing that becomes. In particular, the method of the present invention is suitable for peeling a cured coating film made of polyester urethane, polyester melamine, acrylic urethane, acrylic melamine, etc. used for coating automobiles.
【００２０】さらに、この硬化塗膜は、ポリオレフィン
基体の表面に直接形成されているものでもよいし、プラ
イマー層を介してポリオレフィン基体の表面に形設され
ているものでもよい。このプライマーは特に限定され
ず、この種のポリオレフィン基体の表面に硬化塗膜を形
成するために用いられる、いずれのプライマーでもよ
い。例えば、マレイン化ポリオレフィン、塩素化ポリオ
レフィン、スチレン共役ジエン共重合体、およびその水
添物の塩素化物、マレイン化物、水酸化物等が挙げられ
る。Further, the cured coating film may be directly formed on the surface of the polyolefin substrate, or may be formed on the surface of the polyolefin substrate via a primer layer. This primer is not particularly limited, and any primer used for forming a cured coating film on the surface of this type of polyolefin substrate may be used. Examples thereof include maleated polyolefins, chlorinated polyolefins, styrene-conjugated diene copolymers, and chlorinated products, hydrogenated products, and hydroxides of hydrogenated products thereof.
【００２１】本発明の方法で用いられる水性剥離液は、
アルカリ性物質を含む水溶液である。このアルカリ性物
質としては、例えば、水酸化リチウム、水酸化ナトリウ
ム、水酸化カリウム、水酸化マグネシウム、水酸化カル
シウム等の無機アルカリ性物質などが挙げられる。これ
らは１種単独でも２種以上を組み合わせても用いられ
る。これらの中でも、水酸化リチウム、水酸化ナトリウ
ム、水酸化カリウムが、剥離性能が良好である点で、好
ましい。The aqueous stripper used in the method of the present invention is
It is an aqueous solution containing an alkaline substance. Examples of the alkaline substance include inorganic alkaline substances such as lithium hydroxide, sodium hydroxide, potassium hydroxide, magnesium hydroxide and calcium hydroxide. These may be used alone or in combination of two or more. Among these, lithium hydroxide, sodium hydroxide, and potassium hydroxide are preferable because they have good peeling performance.
【００２２】水性剥離液中のアルカリ性物質の濃度は、
０．１〜５重量％であり、０．２〜４重量％であるのが
好ましい。The concentration of the alkaline substance in the aqueous stripper is
It is 0.1 to 5% by weight, preferably 0.2 to 4% by weight.
【００２３】また、この水性剥離液は、前記アルカリ性
物質以外に、必要に応じて、他の配合剤を含んでいても
よい。例えば、界面活性剤、アンモニア、アミン類、有
機溶媒等を処理促進剤として、少量含んでいてもよい。
界面活性剤としては、例えば、アルキルベンゼンスルホ
ン酸塩、ジアルキルスルホコハク酸塩、ポリオキシエチ
レンアルキルエーテル等が挙げられ、アミン類として
は、例えば、トリエチルアミン等のアミン、モノエタノ
ールアミン等のアルカノールアミン等が挙げられる。ま
た、有機溶媒としては、例えば、メチルアルコール、エ
チルアルコール、１−プロピルアルコール、２−プロピ
ルアルコール、ｔ−ブチルアルコール等の水との相溶性
が良好であるものが挙げられる。In addition to the alkaline substance, the aqueous stripper may optionally contain other compounding agents. For example, a small amount of a surfactant, ammonia, amines, an organic solvent or the like may be contained as a processing accelerator.
Examples of the surfactant include alkylbenzene sulfonate, dialkyl sulfosuccinate, polyoxyethylene alkyl ether and the like, and examples of amines include amine such as triethylamine and alkanolamine such as monoethanolamine. Be done. Examples of the organic solvent include those having good compatibility with water, such as methyl alcohol, ethyl alcohol, 1-propyl alcohol, 2-propyl alcohol, and t-butyl alcohol.
【００２４】本発明の方法において、水性剥離液によっ
てポリオレフィン基体を処理する方法は、特に制限され
ず、基体を水性剥離液を満たした槽中に浸漬する方法、
オートクレーブ中で加圧下に水性剥離液中に基体を浸漬
する方法等にしたがって行うことができる。特に高温で
基体を処理する場合には、加圧状態となるため、オート
クレーブ中で水性剥離液中に浸漬する方法がよい。加圧
状態で処理する場合、圧力は、温度１６０℃で５ｋｇ／
ｃｍ2 程度である。In the method of the present invention, the method of treating the polyolefin substrate with the aqueous stripping solution is not particularly limited, and the substrate is dipped in a tank filled with the aqueous stripping solution,
It can be carried out by a method of immersing the substrate in the aqueous stripping solution under pressure in an autoclave. In particular, when the substrate is treated at a high temperature, it is in a pressurized state. Therefore, it is preferable to immerse the substrate in the aqueous stripping solution in the autoclave. When processing under pressure, the pressure is 5 kg / at a temperature of 160 ° C.
It is about cm 2 .
【００２５】本発明の方法において、水性剥離液で硬化
塗膜を有するポリオレフィン基体を処理する温度は、１
００〜１７０℃であり、好ましくは１２０〜１６０℃で
ある。In the method of the present invention, the temperature at which the polyolefin substrate having the cured coating film is treated with the aqueous stripper is 1
The temperature is from 00 to 170 ° C, preferably from 120 to 160 ° C.
【００２６】さらに、処理時間は、硬化塗膜の種類、膜
厚、基体の形状、寸法、あるいは処理温度等に応じて適
宜選択すればよく、通常、１０分〜１時間程度、好まし
くは２０分〜４０分程度である。Further, the treatment time may be appropriately selected according to the kind and thickness of the cured coating film, the shape and size of the substrate, the treatment temperature, etc., and is usually about 10 minutes to 1 hour, preferably 20 minutes. It takes about 40 minutes.
【００２７】本発明の方法において、水性剥離液によっ
てポリオレフィン基体を処理して硬化塗膜を剥離させた
後、洗浄水槽に浸漬し、水道水等の流動水によって洗い
流す方法にしたがって、基体表面に付着、残留している
塗膜残渣を除去して、表面の硬化塗膜が除去されたポリ
オレフィン基体を得ることができる。In the method of the present invention, the polyolefin substrate is treated with an aqueous stripping solution to release the cured coating film, which is then immersed in a washing water tank and adhered to the substrate surface according to a method of rinsing with flowing water such as tap water. Then, the remaining coating film residue can be removed to obtain a polyolefin substrate from which the cured coating film on the surface has been removed.
【００２８】以上のとおり、本発明の方法によって、硬
化塗膜を除去されたポリオレフィン基体は、再度、塗装
工程において硬化塗膜を形成したり、あるいは再度ペレ
ット化して各種加工品の原料樹脂として再利用できる。
また、使用済みの水性剥離液は、剥離液中の塗膜または
その残渣を濾過等の方法にしたがって除去して再度使用
することができる。As described above, the polyolefin substrate from which the cured coating film has been removed by the method of the present invention has the cured coating film formed again in the coating step, or is pelletized again and reused as a raw material resin for various processed products. Available.
In addition, the used aqueous stripping solution can be reused after removing the coating film or its residue in the stripping solution according to a method such as filtration.
【００２９】[0029]
【実施例】以下、本発明の実施例および比較例によって
本発明を具体的に説明するが、本発明は、これらの実施
例になんら限定されるものではない。EXAMPLES The present invention will be specifically described below with reference to examples of the present invention and comparative examples, but the present invention is not limited to these examples.
【００３０】（実施例１〜７、比較例１〜３）各例にお
いて、カーボンブラックを０．５％含有するポリプロピ
レン（三井石油化学工業（株）製、商品名：三井石油化
学ポリプロＸ４４０、以下、ＰＰと略称する）を射出成
形に供して、厚さ２ｍｍの角板を作製した。この角板を
１，１，１−トリクロルエタン蒸気に３０秒曝して処理
した後、室温下、１分間乾燥した。次に、角板の１，
１，１−トリクロルエタン処理された表面に、プライマ
ー（三井石油化学工業（株）製、ユニストールＰ−９０
２）を、エアースプレーを用いて、乾燥後のプライマー
膜厚が約１０μｍ程度になる様に塗布した後、常温で１
０分間硬化処理を行なった。その後、角板のプライマー
膜の上に熱硬化性塗料である一液型ウレタン塗料（関西
ペイント（株）製、ソフレックス＃１２００）を、エア
ースプレー（吐出圧３kg／cm2 ）を用いて、硬化塗膜の
膜厚が３０〜４０μｍになるように塗布し、３分間セッ
ティングを行なった。次いで、１２０℃、３０分間で塗
膜を硬化させ、ポリプロピレン製の角板の表面にプライ
マーを介して硬化塗膜を形成してなる試料片を得た。Examples 1 to 7 and Comparative Examples 1 to 3 In each example, polypropylene containing 0.5% of carbon black (manufactured by Mitsui Petrochemical Industry Co., Ltd., trade name: Mitsui Petrochemical Polypro X440, hereinafter , PP) was subjected to injection molding to produce a square plate having a thickness of 2 mm. This square plate was exposed to 1,1,1-trichloroethane vapor for 30 seconds, treated, and then dried at room temperature for 1 minute. Next, the square plate 1,
On the surface treated with 1,1-trichloroethane, a primer (UNISTOL P-90 manufactured by Mitsui Petrochemical Industry Co., Ltd.)
2) was applied using an air spray so that the primer film thickness after drying would be about 10 μm, and then 1
Curing treatment was performed for 0 minutes. After that, a one-component urethane paint (Soflex # 1200, manufactured by Kansai Paint Co., Ltd.), which is a thermosetting paint, was applied on the primer film on the square plate using an air spray (discharge pressure 3 kg / cm 2 ). The coating was applied so that the thickness of the cured coating film was 30 to 40 μm, and the setting was performed for 3 minutes. Next, the coating film was cured at 120 ° C. for 30 minutes to obtain a sample piece obtained by forming a cured coating film on the surface of a polypropylene square plate via a primer.
【００３１】得られた試料片を、表１に示す濃度の水性
剥離液に、表１に示す温度条件で２０分間浸漬処理した
後、室温まで冷却した。次に、この試料片の表面を流水
（水道水）で洗い、表面に付着した塗膜と水性剥離液を
取り除いた。このとき、流水（水道水）を流しながら、
塗膜が付着した試料片の表面を手で軽く擦り、塗膜が除
去できるかどうかを試み、試料片の表面における塗膜の
剥離状態を評価した。また、１６０℃での水性剥離液処
理は圧力が約５kg／cm2 になるためオートクレーブを使
用した。結果を表１に示す。The obtained sample piece was immersed in an aqueous stripping solution having a concentration shown in Table 1 for 20 minutes under the temperature conditions shown in Table 1, and then cooled to room temperature. Next, the surface of this sample piece was washed with running water (tap water) to remove the coating film and the aqueous stripping solution adhering to the surface. At this time, while running running water (tap water),
The surface of the sample piece to which the coating film was attached was lightly rubbed by hand to try to remove the coating film, and the peeling state of the coating film on the surface of the sample piece was evaluated. The pressure of the aqueous stripping solution treatment at 160 ° C. was about 5 kg / cm 2 , so an autoclave was used. The results are shown in Table 1.
【００３２】[0032]
【表１】 [Table 1]
【００３３】（実施例８）ポリ４ーメチルー１ーペンテ
ン（三井石油化学工業（株）製、商品名：ＴＰＸＭＸ−
００４）を射出成形に供して、厚さ２ｍｍの角板を作製
し、これを実施例１と同様にして処理して、ポリ４ーメ
チルー１ーペンテン製の角板の表面にプライマーを介し
て硬化塗膜を形成してなる試料片を得た。Example 8 Poly-4-methyl-1-pentene (manufactured by Mitsui Petrochemical Industry Co., Ltd., trade name: TPXMX-
004) is subjected to injection molding to prepare a square plate having a thickness of 2 mm, which is treated in the same manner as in Example 1 and cured and coated on the surface of the square plate made of poly-4-methyl-1-pentene via a primer. A sample piece formed by forming a film was obtained.
【００３４】得られた試料片を、オートクレーブ内にお
いて、５％の水酸化ナトリウム水溶液に、１６０℃で２
０分間浸漬して処理した所、塗膜は完全に除去された。The obtained sample piece was placed in an autoclave in a 5% sodium hydroxide aqueous solution at 160 ° C. for 2 hours.
When the coating was soaked for 0 minutes, the coating film was completely removed.
【００３５】[0035]
【発明の効果】本発明の方法によれば、ポリオレフィン
基体の表面に形成された硬化塗膜を、環境上問題がある
有機溶媒を使用せずに、取扱が容易な低アルカリ濃度の
水性剥離液を使用して従来法によるよりも短時間で容易
に剥離できる。しかも本発明の方法においては、用いる
水性剥離液を繰り返して使用することができるため、工
業上有用である。そのため、本発明の方法は、例えば、
所望の硬化塗膜の形成に失敗し、一度形成した硬化塗膜
を基体より除去し再度塗膜形成を行う場合、また、硬化
塗膜を表面に有する基体において、基体のみを再利用す
るため硬化塗膜を基体から除去する場合に有効に適用で
きる。EFFECTS OF THE INVENTION According to the method of the present invention, a cured coating film formed on the surface of a polyolefin substrate can be easily handled without using an environmentally problematic organic solvent, and a low alkali concentration aqueous stripping solution. Can be easily peeled off in a shorter time than the conventional method. Moreover, in the method of the present invention, the aqueous stripping solution used can be repeatedly used, which is industrially useful. Therefore, the method of the present invention is, for example,
When the desired cured coating film formation fails and the cured coating film that was once formed is removed from the substrate and the coating film is formed again, curing is performed because only the substrate is reused in the substrate having the cured coating film on the surface. It can be effectively applied when removing a coating film from a substrate.
Claims (5)
体を、アルカリ性物質を０．１〜５重量％含む水性剥離
液を用いて１００〜１７０℃で処理する工程を有する塗
膜の除去方法。1. A method for removing a coating film, which comprises a step of treating a polyolefin substrate having a cured coating film on its surface with an aqueous stripping solution containing 0.1 to 5% by weight of an alkaline substance at 100 to 170 ° C.
２〜４重量％含むものである請求項１に記載の塗膜の除
去方法。2. The aqueous stripping solution comprises an alkaline substance of 0.
The method for removing a coating film according to claim 1, which comprises 2 to 4% by weight.
水酸化ナトリウム、水酸化カリウム、水酸化マグネシウ
ムおよび水酸化カルシウムから選ばれる少なくとも１種
である請求項１または２に記載の塗膜の除去方法。3. The alkaline substance is lithium hydroxide,
The method for removing a coating film according to claim 1 or 2, which is at least one selected from sodium hydroxide, potassium hydroxide, magnesium hydroxide and calcium hydroxide.
ある請求項１〜３のいずれかに記載の塗膜の除去方法。4. The method for removing a coating film according to claim 1, wherein the polyolefin is polypropylene.
リオレフィン基体の表面に形設されている請求項１〜４
のいずれかに記載の塗膜の除去方法。5. The cured coating film is formed on the surface of a polyolefin substrate through a primer layer.
The method for removing a coating film according to any one of 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4028362A JP3058978B2 (en) | 1992-02-14 | 1992-02-14 | How to remove the coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4028362A JP3058978B2 (en) | 1992-02-14 | 1992-02-14 | How to remove the coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05220440A true JPH05220440A (en) | 1993-08-31 |
| JP3058978B2 JP3058978B2 (en) | 2000-07-04 |
Family
ID=12246512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4028362A Expired - Fee Related JP3058978B2 (en) | 1992-02-14 | 1992-02-14 | How to remove the coating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3058978B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0786492A3 (en) * | 1996-01-25 | 1998-04-01 | Matsushita Electric Industrial Co., Ltd. | Plastic molded product and method for disposal of the same |
| JPH10128228A (en) * | 1996-09-06 | 1998-05-19 | Suzuki Motor Corp | Method for peeling and separating coating film of resin molding |
| US6196238B1 (en) | 1999-05-19 | 2001-03-06 | Hyundai Motor Co. | Apparatus for removing coated film from plastic bumper of automobile |
| JP2004099993A (en) * | 2002-09-11 | 2004-04-02 | Fujitsu Ltd | Method for removing coating film of coated magnesium alloy member |
| JP2004237191A (en) * | 2003-02-05 | 2004-08-26 | Kenzaburo Sato | Method of washing family buddhist altar and buddhist instrument |
| JP2015077541A (en) * | 2013-10-16 | 2015-04-23 | 地方独立行政法人山口県産業技術センター | Coating film removal method and coating film removal device |
| JP2015188885A (en) * | 2014-03-27 | 2015-11-02 | ハイデルベルガー ドルツクマシーネン アクチエンゲゼルシヤフトＨｅｉｄｅｌｂｅｒｇｅｒ Ｄｒｕｃｋｍａｓｃｈｉｎｅｎ ＡＧ | Method for removing cured ink, pigment, or lacquer |
-
1992
- 1992-02-14 JP JP4028362A patent/JP3058978B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0786492A3 (en) * | 1996-01-25 | 1998-04-01 | Matsushita Electric Industrial Co., Ltd. | Plastic molded product and method for disposal of the same |
| US5874482A (en) * | 1996-01-25 | 1999-02-23 | Matsushita Electric Industrial Co., Ltd. | Plastic molded product and method for disposal of the same |
| JPH10128228A (en) * | 1996-09-06 | 1998-05-19 | Suzuki Motor Corp | Method for peeling and separating coating film of resin molding |
| US6196238B1 (en) | 1999-05-19 | 2001-03-06 | Hyundai Motor Co. | Apparatus for removing coated film from plastic bumper of automobile |
| US6258178B1 (en) | 1999-05-19 | 2001-07-10 | Hyundai Motor Company | Method for removing coated film from plastic bumper of automobile |
| JP2004099993A (en) * | 2002-09-11 | 2004-04-02 | Fujitsu Ltd | Method for removing coating film of coated magnesium alloy member |
| JP2004237191A (en) * | 2003-02-05 | 2004-08-26 | Kenzaburo Sato | Method of washing family buddhist altar and buddhist instrument |
| JP2015077541A (en) * | 2013-10-16 | 2015-04-23 | 地方独立行政法人山口県産業技術センター | Coating film removal method and coating film removal device |
| JP2015188885A (en) * | 2014-03-27 | 2015-11-02 | ハイデルベルガー ドルツクマシーネン アクチエンゲゼルシヤフトＨｅｉｄｅｌｂｅｒｇｅｒ Ｄｒｕｃｋｍａｓｃｈｉｎｅｎ ＡＧ | Method for removing cured ink, pigment, or lacquer |
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| Publication number | Publication date |
|---|---|
| JP3058978B2 (en) | 2000-07-04 |
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