JP3710408B2 - Manufacturing method of plated molded products - Google Patents

Manufacturing method of plated molded products Download PDF

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Publication number
JP3710408B2
JP3710408B2 JP2001322754A JP2001322754A JP3710408B2 JP 3710408 B2 JP3710408 B2 JP 3710408B2 JP 2001322754 A JP2001322754 A JP 2001322754A JP 2001322754 A JP2001322754 A JP 2001322754A JP 3710408 B2 JP3710408 B2 JP 3710408B2
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JP
Japan
Prior art keywords
molded product
chromic acid
liter
plated
molded
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JP2001322754A
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Japanese (ja)
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JP2003129248A (en
Inventor
一郎 林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TAIYO MANUFACTURING CO., LTD.
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TAIYO MANUFACTURING CO., LTD.
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Priority to JP2001322754A priority Critical patent/JP3710408B2/en
Priority to TW091102193A priority patent/TW554086B/en
Priority to PCT/JP2002/001274 priority patent/WO2002064862A2/en
Priority to CNB028068580A priority patent/CN100360716C/en
Priority to MYPI20020502A priority patent/MY142899A/en
Priority to EP02700586A priority patent/EP1360347A2/en
Priority to MYPI20080007A priority patent/MY148983A/en
Publication of JP2003129248A publication Critical patent/JP2003129248A/en
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Description

【0001】
【発明の属する技術分野】
本発明は、樹脂成形品の裏面側に弾性層が一体成形された2色成形品の表面にメッキを処理する方法に関し、詳しくは、例えば、スイッチ、パソコン操作用キー・トップ等の電気、電子部品、パソコン、電話等のOA機器、DVD、MD等の通信機器表面のメッキ方法に関し、さらに詳しくは携帯電話の操作釦(キー)の製造方法に関する。
【0002】
【従来の技術】
例えば、携帯電話の操作釦においては、図1に示すように、樹脂成形品1の裏面にクッション性を付与するために弾性層2が一体成形された2色成形品の表面にメッキ3を施すことがある。
【0003】
このような成形品の表面にメッキを施す場合には、通常、エッチング工程、水洗工程、キャタリスト工程、アクセレーター工程を順次行う無電解メッキを行った後、電気メッキが行われる。
【0004】
エッチング工程においては、成形品をクロム酸と硫酸が混合されたクロム酸混液中に浸漬するが、このエッチングの際に、弾性層がクロム酸混液に溶解し易いために、その後の水洗工程等の際にこの溶解成分が凝固し、さらに次工程へ持ち込まれて拡散することにより、メッキ成形品表面に微細な異物が付着して不良品となることがある。
【0005】
このような問題を避けるためには、クロム酸混液の濃度を、弾性層が溶解し難い程度に下げることが考えられるが、そのようにすると、樹脂成形品表面にメッキされるメッキ層の密着不良を生じる。
【0006】
また、樹脂成形品だけをメッキ処理した後に、その裏面に弾性層を接着することも考えられるが、その場合には生産性が大きく低下する。
【0007】
【発明が解決しようとする課題】
本発明は上記の実状に着目してなされたものであって、その目的とするところは、樹脂成形品の裏面に弾性層が一体成形された2色成形品の表面に、微細な凹凸が形成されることなくメッキを施すことができるメッキ成形品の製造方法を提供することにある。
【0008】
【課題を解決するための手段】
本発明のメッキ成形品の製造方法は、一次成形品の片面の少なくとも一部に、二次成形品として弾性層が一体成形された成形品の表面に、メッキを処理するメッキ成形品の製造方法であって、該成形品をクロム酸と硫酸とが混合されたクロム酸混中に浸漬することにより、該成形品の表面をエッチングする工程を包含し、該エッチング工程が以下の処理条件で実施され、そのことにより上記目的が達成される:
(a)該クロム酸混液の温度:65〜69℃、(b)該クロム酸混液におけるクロム酸の濃度:370g/リットル〜390g/リットル、(c)該クロム酸混液における硫酸の濃度:190g/リットル〜230g/リットル。
なお、本明細書では、クロム酸の濃度は、無水クロム酸(CrO )の濃度を意味する。
【0009】
一つの実施態様では、前記エッチング工程の後、さらに、水洗工程、キャタリスト工程、およびアクセレーター工程、をこの順で有し、該アクセレーター工程が、キャタリスト工程で使用した酸性溶液に比べてpHが中性側の酸性溶液に成形品を浸漬すると共に、該酸性溶液を活性炭と接触させて、酸性溶液中に含まれる不純物を吸着させる工程、および、その後、成形品を水洗する工程、を包含する。
【0010】
一つの実施態様では、前記水洗工程が、以下の方法で実施される:水タンクの底面に微細な空気の泡を吹き出すノズルを設置し、成形品に向けてノズルから空気の泡を吹き出すこと。
【0011】
一つの実施態様では、前記弾性層が、熱可塑性ポリウレタンエラストマーからなる。
【0012】
本発明のメッキ成形品は、上記いずれかの方法によって得られる。
【0013】
そのメッキ成形品が、携帯電話用釦であり得る。
【0014】
本発明の作用は次の通りである。
【0015】
最適なエッチング条件によって2色成形品をエッチングすることにより、弾性層の溶解を極力抑えながら、成形品表面に密着性よくメッキできるようになった。エッチング条件が不十分な場合には、メッキの密着性が十分ではなく、耐久性に劣る。またエッチング条件が本発明の範囲より過度である場合には、弾性層が溶解して成形品の表面状態が悪くなり不良品の発生率が高くなる。
【0016】
【発明の実施の形態】
以下、本発明を詳細に説明する。
【0017】
本発明の携帯電話の操作釦等の成形品4は、図1に示すように、2色成形によって得られるものであり、成形樹脂にて形成された一次成形品1と、該一次成形品1の裏面側に二色成形によって成形された二次成形品として弾性層2とを有する。
【0018】
一次成形品1は、ABS樹脂、ポリプロピレン、塩化ビニル樹脂、ポリスチレン、ポリカーボネート、メタクリル樹脂、ポリスルホン、ポリエステル、ポリアセタール、ポリアミド等を使用できるが、特に好ましい樹脂は、ABS樹脂である。
【0019】
二次成形品2は、ゴム、エラストマー等にて形成され、操作釦が使用されるときのクッション性を付与するものである。弾性層2の硬度はショアーAにて80以上のものに対応でき、特に85〜92程度が好ましい。この弾性層2によって釦にクッション性を付与でき、釦の操作性を向上し、また携帯電話等の機器を落下したときの衝撃を吸収して破損を防止できる。
【0020】
弾性層2は、特に、熱可塑性ポリウレタンエラストマーにて形成することができる。市販品としては、熱可塑性ポリウレタン系エラストマーを使用できる。
【0021】
このようにして得られた成形品4の表面に以下の工程によりメッキ3処理が行われる。
(A)成形品を水洗し、その表面に無電解ニッケルメッキ(化学メッキ)または無電解銅メッキによって金属メッキ層を形成する。
【0022】
無電解メッキは、以下のように行うことができる。
A−1.エッチング工程
無水クロム酸と硫酸の混合液(クロム酸混液)に成形品を所定温度にて所定時間浸漬後、水洗し、表面を粗面化する。
【0023】
この工程での好ましい条件は以下の通りである。
【0024】
使用するクロム酸混液の温度:65〜69℃が好ましく、さらに好ましくは66〜68℃である。
【0025】
クロム酸混液におけるクロム酸の濃度:370g/リットル〜390g/リットルが好ましく、また硫酸の濃度は、190g/リットル〜230g/リットルが好ましい。エッチング工程での処理時間は、通常8〜12分である。
【0026】
クロム酸濃度が上記範囲より高すぎると、弾性層2が溶解されて不純物が溶け出すという欠点があり、また硫酸濃度が上記範囲より高すぎると、結晶が発生するため、連続生産性に劣る。これは、硫酸濃度が高いために、クロム酸混液中のクロム酸が飽和しているためと思われる。
【0027】
なお、上記エッチング工程の前に、予備のエッチング工程を行ってもよい。この場合のエッチング条件は、例えば、以下の通りである。
予備エッチング工程:
使用するクロム酸混液の温度:66〜68℃が好ましい。
【0028】
クロム酸混液におけるクロム酸の濃度:135g/リットル〜165g/リットルが好ましく、硫酸の濃度は、180g/リットル〜220g/リットルが好ましい。エッチング工程での処理時間は、通常2〜4分である。
A−2.水洗工程
上記クロム酸混液を成形品表面から除去するために、水洗工程を行う。水洗は水を成形品にシャワーすることによって行うことができる。また、必要に応じて水洗後、中和工程を行い、その後再び水洗するようにしてもよい。
A−3.キャタリスト(キャタライザー)工程
塩化パラジウムと塩化第一スズと塩酸の水溶液に、上記成形品を浸漬する。その後、水洗し、成形品表面にパラジウムを吸着させる。
【0029】
キャタリスト工程においては、以下の条件で浸漬処理するのが好ましい。
温度:31〜35℃
濃度(キャタリスト):53〜67g/リットル
濃度(塩酸):280〜320g/リットル
濃度(クロム不純物):150ppm以下
水洗工程では、シャワーによって実施することができる。
A−4.アクセレーター工程
塩酸の水溶液に成形品を浸漬し、水洗しキャタリスト工程でパラジウムと一緒に吸着したスズを塩酸で溶解、脱落させる。
【0030】
アクセレーター工程における浸漬条件は以下が好ましい。
【0031】
温度:36〜40℃
不純物(スズ):100ppm以下
ここで、成形品を直接水洗すると、キャタリスト工程で使用した酸性溶液のpH(通常pH1程度である)が急に中性側へ移行するため、水酸化物等の不純物が生成し、成形品の表面に付着するおそれがある。そこで、酸性溶液をpH1.5程度とした後、この溶液を活性炭に通して、不純物を吸着させ、その後水洗するのがよい。
【0032】
また、水洗する場合には、水タンクの底面に微細な空気の泡を吹き出すノズルを設置し、成形品の弾性層2に向けてノズルから空気の泡を吹きだしながら(バブリング)水洗するのがよい。空気の泡が成形品表面(特に弾性層2)に衝突するので、成形品表面に付着した不純物や薬品の残りを効果的に除去することができる。
A−5.無電解ニッケルメッキまたは銅メッキ(化学メッキ)
ニッケルまたは銅、ホルマリン、ロッセル塩、苛性ソーダ、次亜リン酸ソーダ、アンモニア、水等の混合液に浸漬し、水洗する。これによって、ホルマリン、次亜リン酸ソーダの還元反応により、ニッケル(銅)をパラジウム上に析出させる。
【0033】
次に、無電解メッキ層上に、以下のようにして電気メッキを行う。
【0034】
本発明では、ニッケル又は銅メッキをした後に、電気ニッケルメッキ、クロムメッキ、クロム合金メッキ、金メッキ、その他合金メッキをする。
【0035】
【実施例】
(実施例1)
ABS樹脂からなる一次成形品と、熱可塑性ポリウレタンエラストマーからなる二次成形品とを一体成形して2色成形の携帯用釦の成形品を得た。
【0036】
この成形品を以下の条件でエッチングし、エッチング処理後の成形品を2回水洗し、各々の水洗水をメンブランフィルタ(#2)で濾過を行い、濾紙に吸着した残渣を目視確認し、指数評価(最も悪い50、最も良い0)をした。さらに、水洗処理した成形品を、従来と同様の方法でメッキして、成形品のメッキ仕上がりを目視にて観察した。
A.試験目的
上記で説明した第2エッチング工程において、熱可塑性ポリウレタンエラストマーが溶解し、水洗等で凝固の後、次工程へ持ち込み、拡散することにより、ぶつ不良が発生していることが考えられるが、クロム酸混液組成のクロム酸、硫酸のどちらが影響しているかを検討した。
B.試験条件
クロム酸の濃度を変えた3水準(350〜410g/リットルまで、30g/リットル毎に濃度を変化させた)と、硫酸の濃度を変えた3水準(180〜240g/リットルまで、30g/リットル毎に濃度を変化させた)とを組み合わせたクロム酸混液を調製した。
C.試験方法
1リットルビーカーの中に上記で調製したクロム酸混液を入れ、この液中に上記成形品を6個浸漬して8分間エッチング処理した。このエッチング処理を2回繰り返した。
D.評価方法
項目Cでエッチング処理した成形品を2回水洗し、各々の水洗水をメンブランフィルタ(#2)で濾過を行い、濾紙に吸着した残渣を目視確認し、指数評価(最も悪い50、最も良い0)をした。また、濾紙に付着した油膜を目視観察した。
E.結果
結果を表1に示す。
【0037】
【表1】

Figure 0003710408
表1中、nは試験総数、pは不良品の数、%は不良率を示す。また、ブツの大きさおよび突状面積は、成形品の表面に表れたブツの大きさおよびサイズを測定し評価した。
【0038】
表1から明らかなように、クロム酸濃度を380g/リットル、硫酸濃度を210g/リットルとした場合が最も良い結果が得られた。硫酸濃度を240g/リットルとした場合の試験では、ビーカーの液面周辺に液晶が発生するため、ラインには適さないことがわかる。この理由は、硫酸濃度が高すぎるために、クロム酸が混液中で飽和していると思われる。
【0039】
【発明の効果】
本発明によれば、2色成形品の弾性層の溶解を極力抑えながら、成形品表面をエッチングして密着性のよいメッキが行える。従って、成形品の表面にブツ等の発生を抑えて不良品の発生率を低減することができる。
【図面の簡単な説明】
【図1】本発明の製造方法によって得られたメッキ成形品の一実施例の断面図である。
【符号の説明】
1 一次成形品
2 二次成形品
3 メッキ部分
4 成形品[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for treating plating on the surface of a two-color molded product in which an elastic layer is integrally formed on the back side of a resin molded product, and more specifically, for example, electrical and electronic devices such as switches and key tops for operating a personal computer. More particularly, the present invention relates to a method of manufacturing operation buttons (keys) of a mobile phone.
[0002]
[Prior art]
For example, in an operation button of a cellular phone, as shown in FIG. 1, plating 3 is applied to the surface of a two-color molded product in which an elastic layer 2 is integrally molded in order to provide cushioning to the back surface of the resin molded product 1. Sometimes.
[0003]
When plating the surface of such a molded article, electroplating is usually performed after performing electroless plating in which an etching process, a water washing process, a catalyst process, and an accelerator process are sequentially performed.
[0004]
In the etching process, the molded product is immersed in a chromic acid mixed solution in which chromic acid and sulfuric acid are mixed. During this etching, the elastic layer is easily dissolved in the chromic acid mixed solution. At this time, this dissolved component is solidified, and further brought into the next process and diffused, whereby fine foreign substances may adhere to the surface of the plated molded product, resulting in a defective product.
[0005]
In order to avoid such a problem, the concentration of the chromic acid mixed solution may be lowered to such an extent that the elastic layer is difficult to dissolve, but in this case, the adhesion of the plating layer plated on the surface of the resin molded product is poor. Produce.
[0006]
In addition, it is conceivable to adhere an elastic layer to the back surface after plating only the resin molded product, but in this case, the productivity is greatly reduced.
[0007]
[Problems to be solved by the invention]
The present invention has been made paying attention to the above-mentioned actual condition, and the object is to form fine irregularities on the surface of a two-color molded product in which an elastic layer is integrally molded on the back surface of the resin molded product. An object of the present invention is to provide a method of manufacturing a plated molded product that can be plated without being plated.
[0008]
[Means for Solving the Problems]
The method for producing a plated molded product according to the present invention is a method for producing a plated molded product in which plating is performed on the surface of a molded product in which an elastic layer is integrally molded as a secondary molded product on at least a part of one side of the primary molded product. a is, by immersing the molded article in a chromic acid mixed solution of chromic acid and sulfuric acid are mixed, comprising the step of etching the surface of the molded article, the etching process under the following process conditions Implemented, thereby achieving the above objectives:
(A) Temperature of the chromic acid mixture: 65 to 69 ° C., (b) Concentration of chromic acid in the chromic acid mixture: 370 g / liter to 390 g / liter, (c) Concentration of sulfuric acid in the chromic acid mixture: 190 g / Liters to 230 g / liter.
In the present specification, the concentration of chromic acid means the concentration of chromic anhydride (CrO 3 ).
[0009]
In one embodiment, after the etching step, it further includes a water washing step, a catalyst step, and an accelerator step in this order, and the accelerator step is compared with the acidic solution used in the catalyst step. A step of immersing the molded product in an acidic solution having a neutral pH, contacting the acidic solution with activated carbon to adsorb impurities contained in the acidic solution, and then washing the molded product with water. Include.
[0010]
In one embodiment, the water washing step is performed by the following method: installing a nozzle for blowing fine air bubbles on the bottom surface of the water tank, and blowing the air bubbles from the nozzle toward the molded product.
[0011]
In one embodiment, the elastic layer is made of a thermoplastic polyurethane elastomer.
[0012]
The plated molded article of the present invention can be obtained by any one of the above methods.
[0013]
The plated molded product can be a button for a mobile phone.
[0014]
The operation of the present invention is as follows.
[0015]
By etching a two-color molded product under optimum etching conditions, it has become possible to plate the surface of the molded product with good adhesion while suppressing the dissolution of the elastic layer as much as possible. If the etching conditions are insufficient, the adhesion of the plating is not sufficient and the durability is poor. Further, when the etching conditions are excessive from the range of the present invention, the elastic layer is dissolved, the surface state of the molded product is deteriorated, and the incidence of defective products is increased.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
[0017]
As shown in FIG. 1, a molded product 4 such as an operation button of a cellular phone according to the present invention is obtained by two-color molding, and a primary molded product 1 formed of a molding resin, and the primary molded product 1 The elastic layer 2 is formed as a secondary molded product formed by two-color molding on the back surface side of the sheet.
[0018]
The primary molded product 1 can use ABS resin, polypropylene, vinyl chloride resin, polystyrene, polycarbonate, methacrylic resin, polysulfone, polyester, polyacetal, polyamide, and the like, but particularly preferable resin is ABS resin.
[0019]
The secondary molded product 2 is formed of rubber, elastomer, or the like, and imparts cushioning properties when the operation button is used. The hardness of the elastic layer 2 can correspond to 80 or more in Shore A, and is particularly preferably about 85 to 92. The elastic layer 2 can provide cushioning to the button, improve the operability of the button, and can absorb damage when a device such as a mobile phone is dropped to prevent breakage.
[0020]
The elastic layer 2 can in particular be formed of a thermoplastic polyurethane elastomer. As a commercial product, a thermoplastic polyurethane-based elastomer can be used.
[0021]
The plating 3 treatment is performed on the surface of the molded product 4 thus obtained by the following steps.
(A) The molded product is washed with water, and a metal plating layer is formed on the surface thereof by electroless nickel plating (chemical plating) or electroless copper plating.
[0022]
Electroless plating can be performed as follows.
A-1. Etching Step After the molded product is immersed in a mixed solution of chromic anhydride and sulfuric acid (chromic acid mixed solution) at a predetermined temperature for a predetermined time, it is washed with water to roughen the surface.
[0023]
Preferred conditions in this step are as follows.
[0024]
The temperature of the chromic acid mixture to be used is preferably 65 to 69 ° C, more preferably 66 to 68 ° C.
[0025]
The concentration of chromic acid in the chromic acid mixed solution is preferably 370 g / liter to 390 g / liter, and the concentration of sulfuric acid is preferably 190 g / liter to 230 g / liter. The processing time in the etching process is usually 8 to 12 minutes.
[0026]
If the chromic acid concentration is higher than the above range, there is a disadvantage that the elastic layer 2 is dissolved and impurities are dissolved out. If the sulfuric acid concentration is higher than the above range, crystals are generated, so that continuous productivity is inferior. This seems to be because chromic acid in the chromic acid mixture is saturated due to the high sulfuric acid concentration.
[0027]
Note that a preliminary etching step may be performed before the etching step. Etching conditions in this case are as follows, for example.
Pre-etching process:
The temperature of the chromic acid mixture used is preferably 66 to 68 ° C.
[0028]
The concentration of chromic acid in the chromic acid mixed solution is preferably 135 g / liter to 165 g / liter, and the concentration of sulfuric acid is preferably 180 g / liter to 220 g / liter. The processing time in the etching process is usually 2 to 4 minutes.
A-2. Washing step In order to remove the chromic acid mixture from the surface of the molded product, a washing step is performed. Washing with water can be performed by showering water on the molded product. Moreover, you may make it perform a neutralization process after water washing as needed, and may wash with water after that.
A-3. Catalyst (catalyzer) step The molded article is immersed in an aqueous solution of palladium chloride, stannous chloride and hydrochloric acid. Thereafter, it is washed with water to adsorb palladium on the surface of the molded product.
[0029]
In the catalyst process, it is preferable to perform an immersion treatment under the following conditions.
Temperature: 31-35 ° C
Concentration (catalyst): 53 to 67 g / liter Concentration (hydrochloric acid): 280 to 320 g / liter Concentration (chromium impurity): 150 ppm or less In the water washing step, it can be carried out by a shower.
A-4. Accelerator process The molded product is immersed in an aqueous solution of hydrochloric acid, washed with water, and tin adsorbed together with palladium in the catalyst process is dissolved and removed with hydrochloric acid.
[0030]
The immersion conditions in the accelerator process are preferably as follows.
[0031]
Temperature: 36-40 ° C
Impurities (tin): 100 ppm or less Here, when the molded product is washed directly with water, the pH of the acidic solution used in the catalyst process (usually about pH 1) suddenly shifts to the neutral side. Impurities are generated and may adhere to the surface of the molded product. Therefore, after adjusting the acidic solution to about pH 1.5, the solution is passed through activated carbon to adsorb impurities, and then washed with water.
[0032]
In addition, when washing with water, it is preferable to install a nozzle that blows out fine air bubbles on the bottom of the water tank, and to wash the water while blowing air bubbles from the nozzle toward the elastic layer 2 of the molded product (bubbling). . Since air bubbles collide with the surface of the molded product (particularly the elastic layer 2), impurities and chemical residues adhering to the surface of the molded product can be effectively removed.
A-5. Electroless nickel plating or copper plating (chemical plating)
Immerse in a mixed solution of nickel or copper, formalin, Rossell salt, caustic soda, sodium hypophosphite, ammonia, water, etc. and wash with water. Thereby, nickel (copper) is deposited on palladium by a reduction reaction of formalin and sodium hypophosphite.
[0033]
Next, electroplating is performed on the electroless plating layer as follows.
[0034]
In the present invention, after nickel or copper plating, electric nickel plating, chromium plating, chromium alloy plating, gold plating, or other alloy plating is performed.
[0035]
【Example】
(Example 1)
A primary molded product made of ABS resin and a secondary molded product made of thermoplastic polyurethane elastomer were integrally molded to obtain a molded product of a two-color molded portable button.
[0036]
This molded product is etched under the following conditions, the molded product after the etching treatment is washed twice with water, each washed water is filtered with a membrane filter (# 2), and the residue adsorbed on the filter paper is visually confirmed, and the index Evaluation (worst 50, best 0) was made. Further, the washed product was plated by the same method as before, and the plating finish of the molded product was visually observed.
A. Test purpose In the second etching step described above, the thermoplastic polyurethane elastomer is dissolved, coagulated by washing with water, etc., then brought into the next step and diffused. The effect of chromic acid or sulfuric acid in the mixed chromic acid composition was examined.
B. Test conditions Three levels with different concentrations of chromic acid (from 350 to 410 g / liter, the concentration was changed every 30 g / liter) and three levels with different sulfuric acid concentrations (from 180 to 240 g / liter, 30 g / liter) A chromic acid mixed solution was prepared in combination with a different concentration for every liter).
C. Test Method The chromic acid mixture prepared above was placed in a 1 liter beaker, and six of the molded products were immersed in this solution and etched for 8 minutes. This etching process was repeated twice.
D. The molded product etched in the evaluation method item C is washed twice with water, each washed water is filtered with a membrane filter (# 2), the residue adsorbed on the filter paper is visually checked, and the index evaluation (worst 50, most Good 0). Moreover, the oil film adhering to the filter paper was visually observed.
E. The results are shown in Table 1.
[0037]
[Table 1]
Figure 0003710408
In Table 1, n is the total number of tests, p is the number of defective products, and% is the defective rate. Further, the size and the protruding area of the bumps were evaluated by measuring the size and size of the bumps appearing on the surface of the molded product.
[0038]
As is apparent from Table 1, the best results were obtained when the chromic acid concentration was 380 g / liter and the sulfuric acid concentration was 210 g / liter. In the test when the sulfuric acid concentration is 240 g / liter, liquid crystal is generated around the liquid surface of the beaker, so that it is not suitable for the line. The reason for this seems to be that chromic acid is saturated in the mixture because the sulfuric acid concentration is too high.
[0039]
【The invention's effect】
According to the present invention, it is possible to perform plating with good adhesion by etching the surface of the molded product while suppressing the dissolution of the elastic layer of the two-color molded product as much as possible. Therefore, it is possible to suppress the generation of defects on the surface of the molded product and reduce the generation rate of defective products.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of one embodiment of a plated molded product obtained by the manufacturing method of the present invention.
[Explanation of symbols]
1 Primary molded product 2 Secondary molded product 3 Plating part 4 Molded product

Claims (5)

一次成形品の片面の少なくとも一部に、二次成形品として弾性層が一体成形された成形品の表面に、メッキを処理するメッキ成形品の製造方法であって、
該成形品をクロム酸と硫酸とが混合されたクロム酸混液中に浸漬することにより、該成形品の表面をエッチングする工程を包含し、
該エッチング工程が以下の処理条件で実施され、
(a)該クロム酸混液の温度:65〜69℃、
(b)該クロム酸混液におけるクロム酸の濃度:370g/リットル〜390g/リットル、
(c)該クロム酸混液における硫酸の濃度:190g/リットル〜230g/リットル
該エッチング工程の後、さらに、水洗工程、キャタリスト工程、およびアクセレーター工程、をこの順で有し、
該アクセレーター工程が、キャタリスト工程で使用した酸性溶液に比べてpHが中性側である酸性溶液に成形品を浸漬すると共に、該酸性溶液を活性炭と接触させて、酸性溶液中に含まれる不純物を吸着させる工程、および、その後、成形品を水洗する工程、を包含する、メッキ成形品の製造方法。
A method for producing a plated molded product, in which plating is performed on the surface of a molded product in which an elastic layer is integrally molded as a secondary molded product on at least a part of one side of the primary molded product,
Including a step of etching the surface of the molded article by immersing the molded article in a chromic acid mixed liquid in which chromic acid and sulfuric acid are mixed,
The etching step is performed under the following processing conditions:
(A) Temperature of the chromic acid mixture: 65 to 69 ° C.,
(B) Concentration of chromic acid in the chromic acid mixed solution: 370 g / liter to 390 g / liter,
(C) Concentration of sulfuric acid in the chromic acid mixed solution: 190 g / liter to 230 g / liter ,
After the etching step, it further has a water washing step, a catalyst step, and an accelerator step in this order,
The accelerator process is contained in the acidic solution by immersing the molded article in an acidic solution having a neutral pH compared to the acidic solution used in the catalyst process, and bringing the acidic solution into contact with activated carbon. A method for producing a plated molded article , comprising a step of adsorbing impurities and a step of washing the molded article with water .
前記水洗工程が、水タンクの底面に微細な空気の泡を吹き出すノズルを設置し、成形品に向けてノズルから空気の泡を吹き出す工程、を包含する請求項に記載のメッキ成形品の製造方法。2. The production of a plated molded product according to claim 1 , wherein the washing step includes a step of installing a nozzle that blows out fine air bubbles on the bottom surface of the water tank, and blowing out air bubbles from the nozzle toward the molded product. Method. 一次成形品の片面の少なくとも一部に、二次成形品として弾性層が一体成形された成形品の表面に、メッキを処理するメッキ成形品の製造方法であって、
該弾性層が、熱可塑性ポリウレタンエラストマーからなり、
該成形品をクロム酸と硫酸とが混合されたクロム酸混液中に浸漬することにより、該成形品の表面をエッチングする工程を包含し、
該エッチング工程が以下の処理条件で実施される、メッキ成形品の製造方法:
(a)該クロム酸混液の温度:65〜69℃、
(b)該クロム酸混液におけるクロム酸の濃度:370g/リットル〜390g/リットル、
(c)該クロム酸混液における硫酸の濃度:190g/リットル〜230g/リットル。
A method for producing a plated molded product, in which plating is performed on the surface of a molded product in which an elastic layer is integrally molded as a secondary molded product on at least a part of one side of the primary molded product,
The elastic layer is made of a thermoplastic polyurethane elastomer,
Including a step of etching the surface of the molded article by immersing the molded article in a chromic acid mixed liquid in which chromic acid and sulfuric acid are mixed,
A method for producing a plated article, wherein the etching step is performed under the following processing conditions:
(A) Temperature of the chromic acid mixture: 65 to 69 ° C.,
(B) Concentration of chromic acid in the chromic acid mixed solution: 370 g / liter to 390 g / liter,
(C) Concentration of sulfuric acid in the chromic acid mixed solution: 190 g / liter to 230 g / liter.
請求項1〜3のいずれかの方法によって得られるメッキ成形品。The plating molded product obtained by the method in any one of Claims 1-3 . 前記メッキ成形品が、携帯電話用釦である請求項に記載のメッキ成形品。The plated molded product according to claim 4 , wherein the plated molded product is a button for a mobile phone.
JP2001322754A 2001-02-16 2001-10-19 Manufacturing method of plated molded products Expired - Fee Related JP3710408B2 (en)

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CNB028068580A CN100360716C (en) 2001-02-16 2002-02-14 Method for producing plated molded product
MYPI20020502A MY142899A (en) 2001-02-16 2002-02-14 Method for producing plated molded product
PCT/JP2002/001274 WO2002064862A2 (en) 2001-02-16 2002-02-14 Method for producing plated molded product
EP02700586A EP1360347A2 (en) 2001-02-16 2002-02-14 Method for producing plated molded product
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