JP2017197831A - Processing method of plastic surface - Google Patents

Processing method of plastic surface Download PDF

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JP2017197831A
JP2017197831A JP2016091178A JP2016091178A JP2017197831A JP 2017197831 A JP2017197831 A JP 2017197831A JP 2016091178 A JP2016091178 A JP 2016091178A JP 2016091178 A JP2016091178 A JP 2016091178A JP 2017197831 A JP2017197831 A JP 2017197831A
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Prior art keywords
plastic
plastic surface
sulfuric acid
treating
treatment
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JP6750293B2 (en
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永井　達夫
Tatsuo Nagai
達夫 永井
裕都喜 山本
Yuzuki Yamamoto
裕都喜 山本
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Kurita Water Industries Ltd
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Kurita Water Industries Ltd
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Priority to JP2016091178A priority Critical patent/JP6750293B2/en
Priority to EP17789112.4A priority patent/EP3450590A4/en
Priority to PCT/JP2017/010208 priority patent/WO2017187823A1/en
Priority to US16/091,388 priority patent/US20190136380A1/en
Priority to CN201780022812.8A priority patent/CN108884569B/en
Priority to KR1020187028806A priority patent/KR102401889B1/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/18—Pretreatment of the material to be coated
    • C23C18/20—Pretreatment of the material to be coated of organic surfaces, e.g. resins
    • C23C18/22—Roughening, e.g. by etching
    • C23C18/24—Roughening, e.g. by etching using acid aqueous solutions
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/28—Per-compounds
    • C25B1/29—Persulfates
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • C25B15/085—Removing impurities
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/1601—Process or apparatus
    • C23C18/1633—Process of electroless plating
    • C23C18/1635—Composition of the substrate
    • C23C18/1639—Substrates other than metallic, e.g. inorganic or organic or non-conductive
    • C23C18/1641—Organic substrates, e.g. resin, plastic

Abstract

PROBLEM TO BE SOLVED: To provide a processing method of a Cr-free plastic surface, which is a processing method of a plastic surface capable of plating the plastic surface sufficiently adhesively.SOLUTION: In a processing method of a plastic surface for treating plastic with a solution obtained by electrolyzing sulfuric acid, a sulphuric acid concentration in a sulphuric acid solution is 50-92 wt%, a persulfuric acid concentration is 3 g/L or higher, and a treatment temperature is 80°C or higher, or preferably, for example 80-140°C, especially 100-130°C. The plastic is immersed into the sulphuric acid solution for 1-10 minutes, to thereby expose a hydrophilic functional group to the plastic surface.SELECTED DRAWING: Figure 1

Description

本発明は、プラスチック表面の金属化に先立って行われるプラスチック（樹脂成形品）表面の処理方法に関する。   The present invention relates to a method for treating a plastic (resin molded product) surface that is performed prior to metallization of the plastic surface.

構造材料や部品材料として金属が用いられている部位において、軽量化、低コスト化、形状の自由さ、大量生産が容易等のメリットを生かし、プラスチックが代替されている。現在では、装飾用のみならず、自動車の外装や内装部品、家電製品等に広く使用されている。その際、剛性、耐摩耗性、耐候性、耐熱性等を向上させるため、プラスチック表面にめっきを施すことが多い。   In parts where metal is used as a structural material or a part material, plastics are replaced by taking advantage of light weight, low cost, freedom of shape, and easy mass production. At present, it is widely used not only for decoration but also for automobile exteriors, interior parts, and home appliances. At that time, in order to improve rigidity, wear resistance, weather resistance, heat resistance and the like, the plastic surface is often plated.

プラスチックは非導電性のため、めっきを施すにはまず導体となる金属皮膜をプラスチック上に形成する必要がある。その方法を大きく分類すると、ＣＶＤ、ＰＶＤといった乾式法、無電解ニッケルめっきの湿式法である。乾式法は真空状態での成膜がほとんどで、大量生産や大型部品への適用に向かず、湿式法がこれまで採用されてきた。   Since plastic is non-conductive, it is necessary to first form a metal film as a conductor on the plastic in order to perform plating. The methods are roughly classified into dry methods such as CVD and PVD, and wet methods of electroless nickel plating. The dry method is mostly a film formation in a vacuum state and is not suitable for mass production or application to large parts, and the wet method has been adopted so far.

これまでＡＢＳ樹脂及びＰＥＥＫ樹脂の前処理が難しいとされ、そのエッチング工程にクロム酸−硫酸溶液を使用することで目的を達してきた。   Until now, pretreatment of ABS resin and PEEK resin is considered difficult, and the purpose has been achieved by using a chromic acid-sulfuric acid solution in the etching process.

クロム酸はＨ２ＣｒＯ４であり、濃硫酸との混合液である本エッチング液中では
２ＣｒＯ４ ２−＋２Ｈ３Ｏ＋→Ｃｒ２Ｏ７ ２−＋３Ｈ２Ｏ
の平衡が存在するものの、Ｃｒはいずれにせよ６価である。６価ＣｒはＲＥＡＣＨ規制及びＲｏＨＳ規制の対象ではあるものの、製品内に６価Ｃｒが残留するわけでなく、規制を受けるわけではないが、近年環境問題への関心が強くなり、６価Ｃｒを使用しない環境調和型技術が強く要望されている。 Chromic acid is H 2 CrO 4 , and in this etching liquid which is a mixed liquid with concentrated sulfuric acid, 2CrO 4 2 + 2H 3 O + → Cr 2 O 7 2 + + 3H 2 O
However, Cr is hexavalent anyway. Although hexavalent Cr is subject to REACH regulation and RoHS regulation, hexavalent Cr does not remain in the product and is not subject to regulation, but in recent years, interest in environmental issues has increased, and hexavalent Cr has been There is a strong demand for environmentally friendly technologies that are not used.

クロム酸に代わる環境調和型技術として、特許文献１には、過マンガン酸塩及び無機塩の混合液でエッチングすることが記載されている。しかし、この特許文献１の方法では、ＰＥＥＫ樹脂やＡＢＳ樹脂の表面処理は難しく、金属との密着性に問題が生じる。   As an environmentally conscious technique that replaces chromic acid, Patent Document 1 describes that etching is performed with a mixed solution of a permanganate and an inorganic salt. However, in the method of Patent Document 1, surface treatment of PEEK resin or ABS resin is difficult, and there is a problem in adhesion to metal.

特開２００８−３１５１３号公報JP 2008-31513 A

本発明は、Ｃｒフリーのプラスチック表面の処理方法であって、プラスチック表面に十分に密着しためっきをすることができるめっき前処理方法を提供することを目的とする。   An object of the present invention is to provide a Cr-free plastic surface treatment method, which is a plating pretreatment method capable of performing plating sufficiently adhered to a plastic surface.

本発明者らは、上記課題を解決するために鋭意研究を行った結果、硫酸を電気分解して得られる過硫酸（酸化剤）を含む硫酸溶液でプラスチック表面を処理することにより、その後のめっき処理を行っても十分に密着しためっきを得ることができる本発明を完成させた。   As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention treated the plastic surface with a sulfuric acid solution containing persulfuric acid (oxidant) obtained by electrolyzing sulfuric acid, thereby performing subsequent plating. Thus, the present invention has been completed, which can obtain sufficiently adhered plating even when the treatment is performed.

本発明は、かかる知見に基づくものであり、次を要旨とする。   The present invention is based on such knowledge and has the following gist.

［１］ プラスチックを、硫酸を電気分解した溶液で処理することを特徴とするプラスチック表面の処理方法。 [1] A method for treating a plastic surface, wherein the plastic is treated with a solution obtained by electrolyzing sulfuric acid.

［２］ 前記溶液の硫酸濃度が５０〜９２ｗｔ％であることを特徴とする［１］に記載のプラスチック表面の処理方法。 [2] The method for treating a plastic surface according to [1], wherein the sulfuric acid concentration of the solution is 50 to 92 wt%.

［３］ 処理温度が８０〜１４０℃であることを特徴とする［１］または［２］に記載のプラスチック表面の処理方法。 [3] The method for treating a plastic surface according to [1] or [2], wherein the treatment temperature is 80 to 140 ° C.

［４］ 前記溶液の過硫酸濃度が３〜２０ｇ／Ｌであることを特徴とする［１］から［３］のいずれかに記載のプラスチック表面の処理方法。 [4] The method for treating a plastic surface according to any one of [1] to [3], wherein the solution has a persulfuric acid concentration of 3 to 20 g / L.

［５］ 硫酸含有処理液を貯留するための処理槽と、該処理槽内の硫酸含有処理液が循環される、過硫酸生成用電解セルとを備えた処理装置の該処理槽に前記プラスチックを浸漬し、該プラスチックの表面を処理することを特徴とする［１］ないし［４］のいずれかに記載のプラスチック表面の処理方法。 [5] The plastic is placed in the treatment tank of a treatment apparatus including a treatment tank for storing a sulfuric acid-containing treatment liquid and a persulfuric acid generation electrolytic cell in which the sulfuric acid-containing treatment liquid in the treatment tank is circulated. The method for treating a plastic surface according to any one of [1] to [4], wherein the surface of the plastic is treated by dipping.

本発明のプラスチック表面の処理方法によると、プラスチック表面上に十分に密着しためっきを得ることができる。   According to the method for treating a plastic surface of the present invention, it is possible to obtain plating sufficiently adhered to the plastic surface.

前処理装置の構成図である。It is a block diagram of a pre-processing apparatus.

本発明のプラスチック表面の処理方法において、対象となるプラスチックとしては特に限定されないが、クロム酸−硫酸溶液でなければエッチングできない難エッチング性の高いプラスチック、例えば、アクリロニトリル・ブタジエン・スチレン（ＡＢＳ）樹脂やポリエーテルエーテルケトン（ＰＥＥＫ）樹脂、ポリエチレンナフタレート（ＰＥＮ）樹脂、ポリエチレンテレフタレート（ＰＥＴ）樹脂、ポリフェニレンサルファイド（ＰＰＳ）樹脂等が挙げられる。   In the method for treating a plastic surface according to the present invention, the target plastic is not particularly limited, but a highly etchable plastic such as acrylonitrile butadiene styrene (ABS) resin, which cannot be etched unless it is a chromic acid-sulfuric acid solution, Examples include polyether ether ketone (PEEK) resin, polyethylene naphthalate (PEN) resin, polyethylene terephthalate (PET) resin, polyphenylene sulfide (PPS) resin, and the like.

本発明においては、まず上記プラスチックを脱脂し、その後硫酸を電気分解した硫酸溶液に浸漬することによりプラスチック表面を処理する。この硫酸溶液の硫酸濃度は５０〜９２ｗｔ％特に７０〜８５ｗｔ％、過硫酸濃度は３ｇ／Ｌ以上、例えば３〜２０ｇ／Ｌ特に３〜１０ｇ／Ｌ、処理温度は８０℃以上、例えば８０〜１４０℃特に１００〜１３０℃であることが好ましい。この硫酸溶液に１〜１０分間浸漬することにより、プラスチックの表面には親水性の官能基が露出する。ＰＥＥＫ樹脂の場合ヒドロキシル基及びカルボキシル基がプラスチック表面に現れる。   In the present invention, the plastic surface is first degreased, and then the plastic surface is treated by dipping in a sulfuric acid solution obtained by electrolyzing sulfuric acid. The sulfuric acid concentration of the sulfuric acid solution is 50 to 92 wt%, particularly 70 to 85 wt%, the persulfuric acid concentration is 3 g / L or more, for example 3 to 20 g / L, particularly 3 to 10 g / L, and the treatment temperature is 80 ° C. or more, for example 80 to 140. ° C. Particularly preferably 100 to 130 ° C. By soaking in this sulfuric acid solution for 1 to 10 minutes, hydrophilic functional groups are exposed on the surface of the plastic. In the case of PEEK resin, hydroxyl groups and carboxyl groups appear on the plastic surface.

図１は、このような硫酸の電気分解を行うのに好適な電解装置の一例を示す模式的断面図である。   FIG. 1 is a schematic cross-sectional view showing an example of an electrolyzer suitable for performing such electrolysis of sulfuric acid.

処理槽１の外周に恒温ヒータ２が設けられている。槽１内には、被処理プラスチックとしてプラスチック板５が板面を上下方向として配置されている。処理槽１内には、液を撹拌するための散気管等の撹拌手段を設置してもよい。   A constant temperature heater 2 is provided on the outer periphery of the processing tank 1. In the tank 1, a plastic plate 5 as a plastic to be processed is arranged with the plate surface in the vertical direction. A stirring means such as an air diffuser for stirring the liquid may be installed in the treatment tank 1.

処理槽１内の液は、配管７、ポンプ８、電解セル９及び配管１０を介して循環される。電解セル９内にダイヤモンド電極よりなる陽極９ａ及び陰極９ｂと、両者間に配置されたバイポーラ電極９ｃとが設置されている。陽極９ａ及び陰極９ｂに電源ユニットから所定の電流が通電され、硫酸が電解されてペルオキソ二硫酸等の過硫酸が生成する。   The liquid in the processing tank 1 is circulated through the pipe 7, the pump 8, the electrolytic cell 9 and the pipe 10. An electrolytic cell 9 is provided with an anode 9a and a cathode 9b made of diamond electrodes, and a bipolar electrode 9c disposed therebetween. A predetermined current is supplied to the anode 9a and the cathode 9b from the power supply unit, and sulfuric acid is electrolyzed to generate persulfuric acid such as peroxodisulfuric acid.

プラスチック板５の表面処理は、図１に示す装置を用い、処理槽１内に硫酸を収容し、ポンプ８及び電解セル９を作動させ、処理槽１内に硫酸及び過硫酸濃度が上記範囲となった硫酸及び過硫酸含有処理液を生じさせた後、ポンプ８及び電解セル９を作動させながら、所定時間プラスチック板５を処理槽１内の処理液に浸漬することにより行われる。   The surface treatment of the plastic plate 5 uses the apparatus shown in FIG. 1, contains sulfuric acid in the treatment tank 1, operates the pump 8 and the electrolysis cell 9, and the sulfuric acid and persulfuric acid concentrations in the treatment tank 1 are within the above ranges. After the generated sulfuric acid and persulfuric acid-containing treatment liquid is generated, the plastic plate 5 is immersed in the treatment liquid in the treatment tank 1 for a predetermined time while the pump 8 and the electrolytic cell 9 are operated.

処理槽１から取り出したプラスチック板５は、水洗及び乾燥後、めっき処理される。めっき処理方法としては、自己触媒性のある無電解めっき、自己触媒性のない無電解めっきがあるが、そのいずれでもよい。めっきする金属は、ニッケル、銅、コバルト、及びそれらの合金などのいずれでもよい。   The plastic plate 5 taken out from the treatment tank 1 is subjected to plating after washing and drying. As a plating method, there are electroless plating with self-catalytic properties and electroless plating without self-catalytic properties, either of which may be used. The metal to be plated may be any of nickel, copper, cobalt, and alloys thereof.

以下に実施例及び比較例を示し、本発明をより具体的に説明する。但し、本発明はこれらの記載により何ら限定されるものではない。なお、以下の実施例及び比較例においては、過硫酸濃度測定及び付着性試験は次のようにして行った。   Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. However, the present invention is not limited by these descriptions. In the following Examples and Comparative Examples, the persulfuric acid concentration measurement and the adhesion test were performed as follows.

＜過硫酸濃度測定方法＞
まず、ヨウ素滴定により処理液中に含まれる全酸化剤濃度を測定する。このヨウ素滴定とは、Ｋｌを加えてｌ２を遊離させ、そのｌ２をチオ硫酸ナトリウム標準溶液で滴定してｌ２の量を求め、そのｌ２の量から酸化剤濃度を求めるものである。次に、過酸化水素濃度のみを過マンガン酸カリウム滴定により求め、ヨウ素滴定値から過マンガン酸カリウム滴定値を差し引くことにより過硫酸濃度を求めた。
＜付着性試験＞
表面に２ｍｍ間隔で垂直に両方向６本のＰＥＥＫ樹脂まで貫通する切込みを入れ、既定の透明感圧で付着テープではがれ具合をチェックする。はがした部分を図例と比較し、分類０から５までの６段階で評価する。分類０は全くはがれない最も優れた付着性を有することを意味する。また、切込みを入れるのは３箇所である。 <Persulfuric acid concentration measurement method>
First, the total oxidant concentration contained in the treatment liquid is measured by iodine titration. And the iodometric titration to free l 2 by adding Kl, determine the amount of l 2 by titrating the l 2 with sodium thiosulfate standard solution, and requests oxidizing agent concentration from the amount of the l 2 . Next, only the hydrogen peroxide concentration was determined by potassium permanganate titration, and the persulfate concentration was determined by subtracting the potassium permanganate titration value from the iodine titration value.
<Adhesion test>
Make a notch penetrating up to 6 PEEK resins in both directions vertically at 2 mm intervals on the surface, and check the peeling with adhesive tape with a predetermined transparent pressure sensitivity. The peeled part is compared with the example in the figure, and evaluated in 6 stages from classification 0 to 5. Class 0 means having the best adhesion that does not peel off at all. In addition, there are three places to cut.

［実施例１］
図１に示す装置を用いて、ＰＥＥＫ樹脂板の表面処理を行った。処理槽の仕様及び条件は次の通りである。 [Example 1]
The surface treatment of the PEEK resin plate was performed using the apparatus shown in FIG. The specifications and conditions of the treatment tank are as follows.

＜処理槽＞
処理槽１の容積：４０Ｌ
ＰＥＥＫ樹脂板の大きさ：５００ｍｍ×５００ｍｍ×厚さ５ｍｍ
＜過硫酸生成用電解セル＞
セル容積：０．５Ｌ
陽極及び陰極：ダイヤモンド電極（直径１５０ｍｍ）
バイポーラ電極材質：陽極、陰極と同じ
電流密度：５０Ａ／ｄｍ２
液流量：５２Ｌ／ｈ
＜表面処理条件＞
硫酸濃度：８５ｗｔ％
過硫酸濃度：１０ｇ／Ｌ
処理温度：１２０℃
処理時間：５１分 <Treatment tank>
Volume of treatment tank 1: 40L
PEEK resin plate size: 500mm x 500mm x thickness 5mm
<Electrolytic cell for persulfuric acid production>
Cell volume: 0.5L
Anode and cathode: Diamond electrode (diameter 150 mm)
Bipolar electrode material: Same as anode and cathode Current density: 50 A / dm 2
Liquid flow rate: 52 L / h
<Surface treatment conditions>
Sulfuric acid concentration: 85wt%
Persulfuric acid concentration: 10 g / L
Processing temperature: 120 ° C
Processing time: 51 minutes

まず、処理槽１内に８５ｗｔ％の硫酸溶液を収容し、ポンプ８及び電解セル９を作動させて過硫酸濃度が３ｇ／Ｌ以上となった後、ＰＥＥＫ樹脂板を浸漬した。５分間浸漬した後、処理槽１から取り出し、純水で洗浄した後乾燥し、触媒付与工程及び活性化工程を経て無電解ニッケルめっきを施した。各工程の処理条件を表１に示す。   First, an 85 wt% sulfuric acid solution was accommodated in the treatment tank 1, the pump 8 and the electrolysis cell 9 were operated, and the persulfuric acid concentration reached 3 g / L or more, and then the PEEK resin plate was immersed. After being immersed for 5 minutes, it was taken out from the treatment tank 1, washed with pure water, dried, and subjected to electroless nickel plating through a catalyst application step and an activation step. Table 1 shows the processing conditions for each step.

無電解ニッケルめっきした板より１５０ｍｍ×１００ｍｍのサンプルを切り出し、上記方法にて付着性を調べた。   A 150 mm × 100 mm sample was cut out from the electroless nickel-plated plate, and the adhesion was examined by the above method.

Figure 2017197831
Figure 2017197831

［実施例２〜比較例５］
表面処理条件を表２に示すように設定したこと以外は実施例１と同様に試験を行った。結果を表２に示す。表２には実施例１の結果も併記している。 [Example 2 to Comparative Example 5]
The test was performed in the same manner as in Example 1 except that the surface treatment conditions were set as shown in Table 2. The results are shown in Table 2. Table 2 also shows the results of Example 1.

Figure 2017197831
Figure 2017197831

表２の通り、実施例方法によると優れた付着性が得られることが認められる。   As shown in Table 2, it is recognized that excellent adhesion can be obtained according to the example method.

１ 処理槽
２ 恒温ヒータ
５ プラスチック板
９ 過硫酸生成用電解セル DESCRIPTION OF SYMBOLS 1 Treatment tank 2 Constant temperature heater 5 Plastic board 9 Electrolysis cell for persulfuric acid production

Claims (5)

プラスチックを、硫酸を電気分解した溶液で処理することを特徴とするプラスチック表面の処理方法。   A method for treating a plastic surface, comprising treating a plastic with a solution obtained by electrolyzing sulfuric acid. 前記溶液の硫酸濃度が５０〜９２ｗｔ％であることを特徴とする請求項１に記載のプラスチック表面の処理方法。   The method for treating a plastic surface according to claim 1, wherein the sulfuric acid concentration of the solution is 50 to 92 wt%. 処理温度が８０〜１４０℃であることを特徴とする請求項１または２に記載のプラスチック表面の処理方法。   The method for treating a plastic surface according to claim 1 or 2, wherein the treatment temperature is 80 to 140 ° C. 前記溶液の過硫酸濃度が３〜２０ｇ／Ｌであることを特徴とする請求項１から３のいずれかに記載のプラスチック表面の処理方法。   The method for treating a plastic surface according to any one of claims 1 to 3, wherein the solution has a persulfuric acid concentration of 3 to 20 g / L. 硫酸含有処理液を貯留するための処理槽と、該処理槽内の硫酸含有処理液が循環される、過硫酸生成用電解セルとを備えた処理装置の該処理槽に前記プラスチックを浸漬し、該プラスチックの表面を処理することを特徴とする請求項１ないし４のいずれか１項に記載のプラスチック表面の処理方法。   Immersing the plastic in the treatment tank of a treatment apparatus comprising a treatment tank for storing a sulfuric acid-containing treatment liquid and a persulfuric acid generating electrolytic cell in which the sulfuric acid-containing treatment liquid in the treatment tank is circulated; The method for treating a plastic surface according to any one of claims 1 to 4, wherein the plastic surface is treated.
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