CN104674323A - Electrophoretic color filling process - Google Patents

Abstract

The invention aims to disclose an electrophoretic color filling process which specifically comprises the process route of pre-processing of a metal product, chemical degreasing, photosensitive ink coating, pattern transferring, abrasive surface etching, electrolytic polishing, cathode electrophoresis, covering ink removal and drying inspection. According to the electrophoretic color filling process, by a modified low-temperature electrolytic polishing process and a unique covering blue oil removal process, problems about the adhesive power of an electrophoretic layer and an etched bottom layer are effectively solved, and the problem of degradation of performance of the electrophoretic layer during the removal of covering ink is further solved, so that the electrophoretic color filling process can be used for the mass production of industrial labels.

Description

A kind of electrophoresis colors in technique

Technical field

The invention belongs to chemical field, be specifically related to a kind of electrophoresis and color in technique.

Background technology

Traditional metal etch fills out oily technique, first use engraving method to make effect at the bottom of bright word sand, because at the bottom of sand, color is single, usually make effect of the colored mute end by filling out paint by hand or spraying paint, then wipe the paint that bright word adheres to by hand, obtain effect of the bright word colored mute end.

But traditional oily technique of filling out has following defect:

1) the etching series products of the easy wiping of table of type face after font is comparatively large, etching area is less occasion, oil spout is only applicable to, but less for font, etching area is comparatively large and cannot the product of wiping when using, traditional fill out oily technique and cannot realize;

2) for the bright word effect of minute surface, oil cannot be filled out by traditional method, because polishing of later stage can scratch the effect of font or pattern on minute surface.

3) fill out oily efficiency low, wiping efficiency is lower, cannot carry out suitability for industrialized production.

There are some industries to attempt electrophoresis and fill out oily technique, but due to the later stage variable color of not resolving etched surfaces and cover when ink removes the problem that electrophoresis layer is destroyed, the electrophoresis obtained is filled out oil reservoir and usually cannot be tested, so cannot be applied to the surface decoration purposes of electronic product by hundred lattice tests, SaltSprayTest and people's sweat.

Summary of the invention

The object of the invention is open a kind of electrophoresis to color in technique, by the low-temperature electrolytic glossing of modification with unique cover blue oil removing process, solve electrophoresis layer with the adhesion problem of etching bottom and remove cover ink time electrophoresis layer degradation problem.

The present invention is achieved in that a kind of electrophoresis colors in technique, comprises following operational path:

A) processing in early stage of metal product: for dull and stereotyped label series products, use plate shearing machine to be accurately cut to required size; For stereo product, be worked into size and the appearance requirement of product by the mechanical processing tools of car, milling, carving, mill;

B) chemical degreasing: for stainless steel-like product, except oil formula and working conditions as follows:

Strong metallic degreasing powder 30-50G/L

Temperature 60-80 DEG C

Time 3-5MIN

C) photosensitive-ink coating: photosensitive-ink selects the photosensitive circuit ink of PCB industry universal, flat-type product uses the method for silk screen printing, and stereo product uses the method for spraying, and coat-thickness controls between 15-30 μm;

D) Graphic transitions: need protruding position to retain and cover ink, needs the position etching sand face texture to wash away and covers ink;

E) sand facet etch: needing protruding position to remain, is gone down the position needing to etch sand face texture by the method corrosion of chemistry milling, and the degree of depth that guarantee needs; For stainless material, select following processing condition:

Iron trichloride 38-40 degree Baume

Hydrochloric acid 0.2-0.5MOL/L

Temperature 45-53 DEG C

F) electropolishing: select following processing condition:

Sulfuric acid 50-400ML/L

Phosphoric acid 50-400ML/L

Brightening agent 10-50 ML/L

Voltage 10-20V

Negative electrode stereotype or SUS316 stainless steel

Temperature 20-50 DEG C

Time 1-5MIN

G) ability cathode electrophoresis: select EC-3170 negative electrode polyurethane-acrylic resin electrocoating paint, technique is as follows:

Solids content (wt%) 10 ± 2.5

PH（25℃） 4.5±0.5

Specific conductivity (25 DEG C) 500 ± 200 μ S/cm

Temperature 28 ± 2 DEG C

Voltage 20-100V

Time 10-120 S

Condition of cure workpiece temperature 120 DEG C, set time 10MIN

Anode SUS316

Use equipment 100V electrophoresis chamber, ultrafilter and resin tower

H) remove and cover ink: after ability cathode electrophoresis; remove the blue oil that product boss covers; add the surface of a kind of adsorbent at electrocoating paint removing in formula; protect electrocoating paint not to be damaged removing in environment of high temperature highly basic, the Product Process condition after is preferably as follows:

Sodium hydroxide 10-80 G/L

Sodium carbonate 10-30 G/L

Sorbent material 0.3-5 G/L

Temperature 70-80 DEG C

Time 5-10MIN

Use equipment stainless steel ultrasonic device

After ink removes, need with water blast gun blow away surperficial electrocoating paint and cover ink edge cover ink powder;

I) dry inspection: after product removes ink, use pure water to clean up, and dry up with pressurized air, enter baking box and dry, bake out temperature arranges 120 DEG C, time 60MIN.

A kind of electrophoresis of the present invention colors in technique by the low-temperature electrolytic glossing of modification with unique cover blue oil removing process, efficiently solve the adhesion problem of electrophoresis layer with etching bottom, also solve the problem removing electrophoresis layer degradation when covering ink, thus the skill that colored in by electrophoresis can be used for the production in enormous quantities of industrialization label simultaneously.

Accompanying drawing explanation

Fig. 1 is embodiment of the present invention cosmetic sheet scantlings of the structure schematic diagram.

Fig. 2 is embodiment of the present invention cosmetic sheet structure work in-process schematic diagram.

Fig. 3 is embodiment of the present invention cosmetic sheet structure finished product schematic diagram.

Embodiment

Below in conjunction with drawings and Examples, the present invention is described in further detail.

Fig. 1 to be a thickness be decoration structure of mobile phone scale diagrams that 0.3mm stainless steel thin slice makes, length is 20.00mm, and tolerance be Wei+0.1mm and-0.05mm; Width is 6.50mm, and tolerance is Wei+0.1mm and-0.05mm; Middle three English alphabet FLY are stainless steel mirror effects, traditional etching is filled out oil by hand and cannot be made, because font is too little, black region is bigger than normal, is easy to a black matte area damages when polishing after filling out oil, adopt technique of the present invention just can complete so only have, concrete steps are as follows:

Step 1:

The processing in early stage of metal product: this step is the earlier processing steps of product, because be dull and stereotyped label series products, just need to use plate shearing machine to be accurately cut to required size, this product sawing sheet uses the SUS304BA material of 0.3MM, and size is cut into the sheet of 300MM*125MM.

Step 2:

Chemical degreasing: select following except oil formula and processing condition according to stainless material:

Strong metallic degreasing powder 45G/L

Temperature: 70 DEG C

Time: 4MIN

Workpiece after oil removing adopts cleaning showers, and select weak acid to neutralize, avoiding alkaline components to remain can affect the follow-up sticking power covering ink, and the equipment used comprises Ultrasonic Cleaners and spray cleaning equipment simultaneously.

Step 3:

Photosensitive-ink applies: photosensitive-ink selects the photosensitive circuit ink of PCB industry universal, uses silk screen printing, strictly must control the thickness of ink, if thickness is too thin, then etches and easily occur pin hole; If ink is too thick, then ink removes difficulty; The ink thickness of the present embodiment controls at 15-30 micron; The equipment used comprises screen process press.

Step 4:

Graphic transitions: three protruding English alphabet FLY in Fig. 1 are retained and covers ink, need the shadow region etching sand face texture to wash away in Fig. 1 and cover ink, see Fig. 2 through work in-process that this step obtains.The equipment used comprises, single-side exposure machine, developing machine.

Step 5:

Sand facet etch: simultaneously the present embodiment to be remained by three protruding English alphabet FLY in Fig. 1 by two-sided etching to etch product design size, single product is still connected on Fig. 2 sheet by position, the mouth of a river, need the shadow region etching sand face texture also gone down by the method corrosion of chemistry milling and produced sand face texture in Fig. 1, depth of corrosion is between 0.08-0.15mm.The present embodiment selects SUS304 stainless material, and processing condition are as follows:

Iron trichloride 39 degree of Baumes

Hydrochloric acid 0.3MOL/L

Temperature 50 C

Time 15MIN

The equipment used comprises two-sided vertical spray etching machine.

Step 6:

Electropolishing: this step is one of critical process of the present invention, because deposit in follow-up and the secondary pollution at etching texture position can be caused in checkout procedure after product corrosion, and this product is because carry out electrophoresis with covering blue oil, conventional ultrasonic oil removing, all inevitably destroy the sticking power of electrophoresis layer except cured and electrolytic degreasing technique, or directly take off and cover ink, so common treatment process all can not effectively use.For the problems referred to above, we use the method for electropolishing, and by the improvement to formula, process for etching texture face, satisfactory for result.Processing condition are as follows:

Sulfuric acid 200 ML/L

Phosphoric acid 350 ML/L

Brightening agent 30 ML/L

Voltage 15V

Negative electrode SUS316 stainless steel

Temperature 35 DEG C

Time 2MIN

For stainless material, if need texture brighter, electrocoating paint selects light, and the concentration simultaneously improving phosphoric acid is to the concentration of 400 ML/L and brightening agent to 50 ML/L; If need texture dumb light some, electrocoating paint also will to select dumb light, selects phosphoric acid concentration to the concentration of 50 ML/L and brightening agent to 10 ML/L simultaneously.Institute's use equipment comprises 20V electrolyzer.

Step 7:

Ability cathode electrophoresis: ability cathode electrophoresis selects EC-3170 negative electrode polyurethane-acrylic resin electrocoating paint.Technique is as follows:

Solids content (wt%) 11

PH（25℃） 4.5

Specific conductivity (25 DEG C) 500 μ S/cm

Temperature 28 DEG C

Voltage 60V

Time 60S

Condition of cure: workpiece temperature 120 DEG C, set time 10MIN

Anode SUS316

Institute's use equipment comprises 100V electrophoresis chamber, ultrafilter and resin tower.

Step 8:

Remove and cover ink: after product ability cathode electrophoresis, in Fig. 1, three protruding English alphabet FLY positions still have and cover blue oil and cover, if do not need to deviate from blue oil, so this technique does not just have any difficult point, but remove blue oil to need to use highly basic and high temperature, this all can have a strong impact on the toughness of electrocoating paint and the bonding force with ground, so the process of bottom and the selection of removing process ensure that this technique is successfully crucial.Add the surface of a kind of adsorbent at electrocoating paint removing in formula, protect electrocoating paint not to be damaged removing in environment of high temperature highly basic.Product Process after is preferably as follows:

Sodium hydroxide 50G/L

Sodium carbonate 20 G/L

Sorbent material 3 G/L

Temperature 75 DEG C

Time 6MIN

After ink is deviate from, need with water blast gun blow away surperficial electrocoating paint and cover ink edge cover ink powder, institute's use equipment comprises stainless steel ultrasonic device.

Step 9:

Dry inspection: after product removes ink, use pure water to clean up, and dry up with pressurized air, enter baking box, dry 60MIN for 120 DEG C.

Step 10:

Blanking punched: sheet is struck out small pieces, just obtain the finished product shown in the Fig. 3 required for us, often magnify sheet and can make 182 small pieces, improve about 10 times than manual efficiency of polishing.The equipment used comprises high speed and precision punch press.

Claims (1)

1. electrophoresis colors in a technique, it is characterized in that, comprises following operational path:

A) processing in early stage of metal product: for dull and stereotyped label series products, use plate shearing machine to be accurately cut to required size; For stereo product, be worked into size and the appearance requirement of product by the mechanical processing tools of car, milling, carving, mill;

B) chemical degreasing: for stainless steel-like product, except oil formula and working conditions as follows:

Strong metallic degreasing powder 30-50G/L

Temperature 60-80 DEG C

Time 3-5MIN

C) photosensitive-ink coating: photosensitive-ink selects the photosensitive circuit ink of PCB industry universal, flat-type product uses the method for silk screen printing, and stereo product uses the method for spraying, and coat-thickness controls between 15-30 μm;

D) Graphic transitions: need protruding position to retain and cover ink, needs the position etching sand face texture to wash away and covers ink;

E) sand facet etch: needing protruding position to remain, is gone down the position needing to etch sand face texture by the method corrosion of chemistry milling, and the degree of depth that guarantee needs; For stainless material, select following processing condition:

Iron trichloride 38-40 degree Baume

Hydrochloric acid 0.2-0.5MOL/L

Temperature 45-53 DEG C

Time 10-20MIN

F) electropolishing: select following processing condition:

Sulfuric acid 50-400ML/L

Phosphoric acid 50-400ML/L

Brightening agent 10-50 ML/L

Voltage 5-15V

Negative electrode stereotype or SUS316 stainless steel

Temperature 20-50 DEG C

Time 1-5MIN

G) ability cathode electrophoresis: select EC-3170 negative electrode polyurethane-acrylic resin electrocoating paint, technique is as follows:

Solids content (wt%) 10 ± 2.5

PH（25℃） 4.5±0.5

Specific conductivity (25 DEG C) 500 ± 200 μ S/cm

Temperature 28 ± 2 DEG C

Voltage 20-100V

Time 10-120 S

Condition of cure workpiece temperature 120 DEG C, set time 10MIN

Anode SUS316

Use equipment 100V electrophoresis chamber, ultrafilter and resin tower

H) remove and cover ink: after ability cathode electrophoresis; remove the blue oil that product boss covers; add the surface of a kind of adsorbent at electrocoating paint removing in formula, be not damaged at the protection swimming paint in environment that removes of high temperature highly basic, the Product Process condition after is preferably as follows:

Sodium hydroxide 10-80G/L

Sodium carbonate 10-30 G/L

Sorbent material 0.3-5 G/L

Temperature 70-80 DEG C

Time 5-10MIN

Use equipment stainless steel ultrasonic device

After ink removes, need with water blast gun blow away surperficial electrocoating paint and cover ink edge cover ink powder;

I) dry inspection: after product removes ink, use pure water to clean up, and dry up with pressurized air, enter baking box and dry, bake out temperature arranges 120 DEG C, time 60MIN.