JPS6010916B2 - Engraving method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel method of engraving using etching printing inks.

Conventionally, etching of metal or non-metallic materials has been carried out by photoetching or chemical reeling.

The photoetching method consists of {1} Creation of an original drawing, (2- Creation of an original plate using photoengraving method, {3' Pretreatment of the surface of the workpiece (degreasing, polishing, pickling, water washing, drying), ■ Application of photosensitive liquid,
[5} Exposure, ■ Development (→ Dyeing → Burning), {7- Apply anti-corrosion varnish to the back side of the workpiece, {8} Corrosion, ■ Washing with water, (1
0) Resist and anticorrosion varnish removal, (11) water washing, drying,
(12) The number of processes is large, consisting of 12 steps of finishing and inspection, and each product requires many materials such as photosensitive solution, developer, anti-corrosion varnish remover, and corrosive solution, so the manufacturing process per product is difficult. It has the disadvantage of high time and manufacturing costs.

In addition, in the chemical milling method, '1} is the creation of a mask,
{2' Pretreatment of the surface of the workpiece, {3' Masking, '4
It consists of 8 steps: 'Corrosion,' 5)Water washing, side resist removal, '7-Water washing, drying, ■Finishing, and inspection.The number of steps is fewer than the photo-etching method described above, but it has the disadvantage of lower accuracy than the photo-etching method. .

In addition, when corroding the workpiece, as with any of the above methods, the simple etching method takes time, side etch is large, and tends to cause uneven corrosion, so generally a corrosive solution is not used. Corrosion must be carried out by splashing or spraying on the surface of the workpiece plate, which has the drawback of high equipment costs. Furthermore, the lifespan of the corrosive liquid is not very long, and therefore not only does the material cost of the corrosive liquid itself increase, but the quality also tends to vary and the yield rate decreases, which has the disadvantage of greatly affecting quality control and work efficiency.

In general, the corrosive liquid becomes fatigued after being used several times, so it has the disadvantage of having to be replenished with new liquid or discarding all the worn-out liquid and replacing it with new liquid. Furthermore, the used corrosive liquid and washing waste liquid cannot be directly disposed of as waste water, and the waste water must be physically treated to remove harmful components, which has the disadvantage of requiring expensive waste water treatment equipment. be.

The present invention has been completed as a result of research into an etching process that eliminates the above-mentioned drawbacks. That is, in the present invention, a pattern to be etched is printed on the surface of a workpiece using an etching printing ink containing microcapsules containing an etching liquid that can be destroyed by heat and/or pressure, and then the printing ink film is etched. An etching method characterized by applying heat and/or pressure to the layer to destroy microcapsules containing an erosive solution, causing the etchant to flow out from within the microcapsules, and etching a workpiece with the etchant. It is.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

First, as shown in FIG. 1, a pattern 4 to be etched is printed on the surface of a workpiece 1 using an erosive printing ink 3 containing erosive liquid microcapsules 2 that can be destroyed by heat and/or pressure. .

In the above, the corrosive liquid microcapsule 2 is one in which a corrosive liquid 21 as a core substance is surrounded by a wall film 22 that can be broken by heat and/or pressure, as shown in the second figure.

As the corrosive liquid 21 which is the core substance, for example, caustic soda,
Hydrochloric acid, mixed solution of ferric chloride solution and hydrochloric acid, ferric chloride solution,
A mixed solution of ammonium persulfate and mercuric chloride, nitric acid, a mixed solution of nitric acid and sulfuric acid, a mixed solution of nitric acid and hydrochloric acid, a mixed solution of chromic acid and sulfuric acid, a mixed solution of ferric chloride and sulfuric acid, a mixed solution of nitric acid and sulfuric acid, A mixture of hydrogen oxide, a mixture of hydrochloric acid and hydrogen peroxide,
A mixed solution of nitric acid and silver nitrate, a mixed solution of hydrofluoric acid, a persulfate and a fluoride, a mixed solution of powdered zinc and hydrochloric acid, etc. can be used.

In this case, if the mixed liquid itself is reactive, such as a mixed liquid of hydrochloric acid or nitric acid and hydrogen peroxide, the ink may be prepared by making capsules of each separately and mixing the two types of capsules. Materials for the wall membrane 22 include, for example, integrated polymers such as polyamide, polyester, polyurethane, polyurea, polycarbonate, formalin naphthalene sulfonic acid condensate, amino resin, alkyd resin, silicone resin, maleic anhydride copolymer [ethylene, vinyl methyl ether, etc.], copolymers such as acrylic acid and methacrylic acid alone or copolymers, polyvinyl chloride, polyvinylidene chloride, polyethylene, polystyrene, polyvinyl acetal, polyacrylamide, polyvinylbenzenesulfonic acid, Polyvinyl alcohol, homopolymers such as synthetic rubber, epoxy resins, nitroparaffins, curable polymers such as nitrated polystyrene, waxes, paraffins, rosins, silica, tristearin, monoglycerides, beeswax, wood wax, oils and fats, hardened etc. Waxy substances can be used.

The membrane material must be selected in consideration of its relationship with the core material.

In other words, if the core material is a mineral acid other than an oxidizing chemical, use a hydrocarbon compound without unsaturated bonds such as polyethylene or polypropylene, or a polyvinyl chloride plastic, phenolic resin, or acrylic resin. ,
If the core material is an inorganic alkali, a hydrocarbon compound free of unsaturated bonds such as polyethylene or polypropylene, or polyvinyl chloride plastic, urea resin, acrylic resin, or epoxy resin is used.

Furthermore, if the core material is oxidizing nitric acid or concentrated hydrochloric acid, only special plastics such as polyvinylidene chloride can be used. Encapsulation can be achieved, for example, by interfacial polymerization, i.
This can be carried out by methods such as an in situ polymerization method, a melt dispersion cooling method, a phase separation method from an organic solution system, and an in-liquid drying method.

The etching printing ink 3 is a composition containing a mixture of the microcapsules 2 and a vehicle as a main ingredient, to which various auxiliary agents such as a drying suitability regulator are added as necessary. The vehicle for the etching printing ink should be selected in consideration of the relationship with the wall material of the microcapsules, and examples of the vehicle include the following.

(i) Maleic acid resin for gravure, rosin-modified phenolic resin, cyclized rubber, ethyl cellulose, nitrocellulose, shellac, polyamide resin, coumaronindene resin, vinyl resin,
Petitral resin, gum arabic, dextrin, rosin-modified alkyd, etc. alone or as a mixture of solids/cinders can be treated with aromatic solvents such as toluol, xyol, ethyl ester aromatic solvents, alcohols, hydrocarbon solvents, M old K
Vehicle (ii) Contains linseed oil stand oil for offset, drying oil-modified alkyd resin (drying oil-modified phthalic acid algide resin, isophthalic acid alkyd resin, etc.), rosin-modified phenolic resin, dissolved in Kent-based solvent such as MIBK, Kanon, etc. Resin varnish etc. (iii) Linseed oil stand oil for silk screen, resin varnish made by dissolving maleic acid resin in linseed oil, dehydrated castor oil, etc., vehicle made by adding approximately the same amount of white spirit to bag-type oil-modified alkyd resin, etc. , a vehicle in which nitrocellulose, ethylcellulose, ethylhydroxy, ethylcellulose, etc. are dissolved in a solvent and an appropriate plasticizer is added, a vehicle in which shellac is dissolved in water using borax, a vehicle in which modified butyral resin is dissolved in an aromatic solvent, etc. d,' Fixed binder of maleic acid resin for flexo, ethyl cellulose, nitrocellulose, rosin-modified phenol resin, ketone resin, zein, etc. alone or in combination with denatured alcohol,
A vehicle dissolved in an alcohol solvent such as propyl alcohol or inpropyl alcohol, a vehicle in which a solid binder such as polyamide resin, acrylic resin, chlorinated rubber, or cellulose derivative is dissolved in a mixed solvent such as alcohol, estel, ketone, or naphtha; dextrin,
In addition to water-soluble materials such as gum arabic, polyvinyl alcohol, and methylcellulose, materials that are insoluble in water such as shellac, maleic acid resin, and zein are applied to the surface of the workpiece 1 by heat and/or pressure as shown in the first diagram. After printing a pattern 4 to be etched using an etching printing ink 3 containing breakable microcapsules 2 of an erosive liquid, heat and/or pressure is applied to the printing ink coating layer to form microcapsules of an erosive liquid. The microcapsules are destroyed and the corrosive liquid flows out from within the microcapsules, and the workpiece is etched by the corrosive liquid as shown in the third figure.

The depth of corrosion obtained in one corrosion operation is relatively shallow.

If deep etching is desired, deep etching can be achieved by repeating the above etching operation on the same location.

According to the present invention, metals such as aluminum, anodized aluminum, chromium, gold, molybdenum, silver, stainless steel, steel, titanium, zinc, etc., or glass, shellac, Nesafilm, silicon, germanium, plastics, etc. can be etched. can.

Next, examples of the etching process according to the present invention will be specifically explained.

Example 1 Microcapsules having a particle size of 30 to 50 mm were prepared by using a 370 ferric chloride solution as a core material and wrapping the core material in an ethylene-vinyl acetate copolymer.

Next, using these microcapsules, a silk sulin printing ink having the following composition was prepared. [Ink composition] 0 Microcapsules 85 parts Epoxy-modified butyral resin 15 parts Aromatic solvent (Solvesso No. 150 manufactured by Tohyo Sangyo ■) 15 parts Next, apply this ink to a 0.5-thickness steel foil with a 1005 mesh check. Using a screen version of the pattern, the check pattern was painted using a silk screen printing method.

Next, the steel foil was heat-treated at 150° C. for 5 minutes, cooled, washed with water, and dried. As a result, a steel foil having a plaid pattern with zero engravings was obtained.

Despite the simple process, this product's appearance was comparable to that obtained by conventional etching methods.

Example 2 A ferric chloride solution of 300 mm was used as a core material, and the core material was wrapped in vinylidene chloride to prepare microcapsules having a particle size of 30 to 50 mm.

Next, using this microcapsule, a silk screen printing ink having the following composition was prepared. 0 [Ink composition] Mike.

Capsule 8: Epoxy-modified butyral resin 2: Ikarito aromatic solvent (Solbetsuso No. 150, manufactured by Tohyo Sangyo Co., Ltd.) 15 parts Next, this ink was used to silk screen a steel plate with a thickness of 1 layer using a 100 mesh screen plate. A polka dot pattern was printed using a printing method.

Next, after applying heat pressure at 150℃ and 15kg/3 inkstone sand, heat treatment was performed for 8 minutes at 70°C, after cooling, the laminated film was peeled off, washed with water, and dried. A copper plate with a polka dot pattern was obtained. Despite the simple process, this product was comparable in appearance to that obtained by conventional etching methods.

As described in detail above, according to the present invention, a large number of metals can be etched at low cost with high production efficiency in a short time with a small number of steps without the need for creating a cumbersome resist pattern and without requiring a corrosion protection process. .

Furthermore, the equipment required for corrosion is simple and does not require a large amount of space or equipment cost. Furthermore, since the corrosion rate can be regulated by the microcapsule content, the amount of ink applied, the temperature, etc., the corrosion work can be easily managed and a stable product can be obtained.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a workpiece with a pattern of etching printing ink film formed on its surface, Figure 2 is a cross-section of a microcapsule containing an etchant, and Figure 3 is the state of the workpiece after being etched. FIG. Explanation of the symbols representing the main parts of the figure: 1... Work material, 2... Corrosion-containing liquid microcapsule, 3...
・...Erosive printing ink, 21...Erosive liquid, 22...
- Wall membrane. Obi I Zusei 2 Illustrations 3

Claims (1)

[Claims] 1. After printing a pattern to be etched on the surface of the workpiece using an etching printing ink containing microcapsules containing an etchant that can be destroyed by heat and/or pressure, the printing ink coating layer is heated and An etching method characterized in that the microcapsules containing an erosive solution are destroyed by applying pressure, the erosive solution is caused to flow out of the microcapsules, and a workpiece is etched by the etchant.