JPH0568435B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing marble-patterned ceramics, which could not be obtained at all by conventional glaze decoration methods.

[Conventional technology]

One of the traditional techniques for decorating ceramics is to use glaze. Products that have been glazed require glaze firing or final firing.

The glaze is called low heat glaze or low heat glaze and is heated to 800-900℃.
There are some types of ceramics that can be melted at a high heat temperature of 1,200 to 1,300 degrees Celsius, and others called high-fire glazes or strong-fire glazes that can only be melted at a high heat temperature of 1,200 to 1,300 degrees Celsius. Glazed items are limited to special items such as Raku ware.

Therefore, the pigments used for painting are limited to heat-resistant inorganic pigments, and it has been completely impossible to use the many organic pigments and dyes that have been developed today. For this reason, in conventional ceramics, vivid coloring using organic pigments or dyes, or special patterns using synthetic resin adhesives or organic solvents, have rarely been done.

In addition, mass production of ceramic products with the same design is carried out by pasting transfer paper.
The use of this method is often limited due to the shape of the molded product, for example, a shape with many irregularities or a complicated shape.

Furthermore, if the transfer paper is wrapped around and attached to the entire surface of a cylindrical object such as a pot, seams may occur or the pattern may lack continuity. Alternatively, if transfer painting was performed only on a part of the cylinder to avoid this phenomenon, the pattern would be cut off depending on the viewing position, causing the product to be front and back, which was often a problem.

On the other hand, if you compare the functions of the inside and outside of ceramics, they are not necessarily the same. The inside of tea bowls, vases, urns, etc. is often used under harsher conditions than the outside, and performances such as heat resistance, water resistance, stain resistance, and abrasion resistance are required to withstand practical use. . On the other hand, the outside is designed with patterns and patterns to attract the desire to purchase.
Emphasis is placed on decoration such as painting, or the value is judged as a work of art. For this reason, the outside often does not require as much practical strength as the inside.
In addition, for plates, ornaments, etc., emphasis is often placed on the decorative appearance rather than the practical strength of both the inside and outside.

From this, it can be seen that in the past, the decoration on the inside of teacups, vases, urns, etc., or on the outside of dishes, etc., was very simple in decoration, with little painting or patterning, and was streamlined. It was a lot.

In view of these circumstances, the inventors of the present invention conducted extensive research to see if it would be possible to streamline at least the glazing of one side of the outside or inside of ceramics, and the accompanying firing process. Coupled with the remarkable development of ceramic pots, for example, during the production process of ceramic pots, it was possible to decorate the outer part with paint instead of glaze or firing.

This greatly simplified the process and the content of the work, resulting in an immeasurable cost reduction, but at the same time, it was also possible to develop a new type of decoration that could not be expressed using glaze.

[Purpose of the invention]

The present invention is one of them, and aims to provide a method for producing marble-patterned ceramics, which cannot be obtained at all using conventional glaze decoration methods.

[Structure of the invention]

That is, the manufacturing method of the present invention is to apply a partial undercoat of a specific color to one side of the ceramic after primer coating, apply a basic pattern coating through a masking board with holes punched in a randomly curved shape, and apply a thin layer of pattern forming agent to the entire surface. A marble-like pattern is applied by painting and partially dabbing with an organic solvent, and a coating is applied to fix this marble-like pattern. After the final coating, a forced baking is performed at 80 to 120 degrees Celsius for 20 to 50 minutes. It is characterized by cooling.

For convenience, one of the surfaces will be described as an outer portion and the other surface will be referred to as an inner portion.

The outer part of the ceramic before being painted and decorated may be bisque fired, closed fired, simply glazed and glazed, or subjected to a final firing process after glazing. As long as the inner part of the ceramic is glazed, it does not matter whether it is raw, raku-yaki, glaze-yaki, or honyaki-fired.

Next, the outside surface of the unglazed, glazed, or final fired state is decorated with paint as described above.The types of paint include, for example, lacquer (cellulose derivative paint), synthetic resin, etc. Paints (especially polyurethane resin paints, etc.) or transparent paints that do not contain pigments (varnishes, clears, etc.)
Alternatively, a coloring paint containing a pigment (enamel, paint, etc.) can be selected as appropriate depending on the use and shape of the ceramic.

As for the coating (coating film formation) method, brush coating, spray coating, electrostatic coating, flow coating, dip coating, roller coating, powder coating, etc. can be used as appropriate depending on the purpose and shape.

The coating film can be cured using reaction heat or heating (solvent evaporation, oxidative polymerization reaction, thermal condensation reaction, thermal fusion reaction, etc.), or photopolymerization using energy rays such as ultraviolet rays or electron beams. Depending on the type of paint and the purpose and shape of the ceramic, any of these may be used. Particularly in the latter case, the reaction proceeds in a short period of time, resulting in a hard coating film, so it is better to use coatings that can be processed by this method as much as possible. Incidentally, the painting work can be done either manually or automatically by a painting robot.

Regarding the painting process, since the painted surface often already has a simple glaze applied to it, it is necessary to first apply a primer to prepare the surface. Next, the above-described present invention is carried out after undercoating.

The undercoat that follows the primer is not a full-scale painting, but a partial underpainting (patterning) using a specific color of paint. If you look at natural marble, you will notice that there are relatively sharp layers of ivory or green in some places, so the first step is to apply an underpainting to resemble it. The paint is preferably a lacquer or polyurethane resin paint that has good adhesion and quick drying properties.

A pattern-forming agent is prepared by spreading a dye and a pigment thinly with, for example, turpentine oil, and is a special paint containing a colorant that is soluble in a solvent (e.g., dye) and a colorant that is insoluble in a solvent (e.g., pigment). . The opposite behavior of the dye and pigment with respect to the alcohol solvent leads to the formation of the marble pattern according to the present invention.

Brush painting is done using organic solvents such as alcohol. At this time, the organic solvent oozes out radially like a capillary phenomenon, but at the same time, the pigment is also radially repelled and flows toward the periphery, so that a clear marble-like line pattern is formed.

The marble pattern thus formed is fixed by adhering to the base (base) pattern-coated surface, and can be fixed, for example, by spray painting a clear lacquer from the surface.

Spray painting is preferable for the top coat to give a beautiful finish. As a top coat, weather resistance, water resistance, salt water resistance, fading resistance, impact resistance, hardness, etc. are generally required, so for example, urethane-based, acrylic-based, epoxy-based, alkyd-based, and unsaturated polyester resin paints are used. is preferable, and since a coating film curing method using ultraviolet rays or electron beams has been developed for these resin coatings, a highly hard coating film can be formed in a short time. Note that a finishing step after coating is often unnecessary, unlike in the case of glazes.

〔Example〕

Examples of the present invention will be described below.

The pot was molded from clay, dried, unglazed, then glazed on both the inside and outside, and then fired.

Next, this vase before overpainting was placed on a potter's wheel, a lacquer primer was applied to the entire outside surface, and the jar was thoroughly dried.

Next, ivory-colored Lutzker was partially spray-painted as an undercoat on some of the outer surfaces. This is an ingenuity to give the color of natural stone to some parts of the overall marble pattern. Therefore, this partial undercoat may be of green or red color.

This was then spray-painted with gray or brown paint through a masking plate with holes punched in a randomly curved shape to create a predetermined pattern as a base.

After this patterning, a pattern forming agent made of a mixture of dark brown and blue paint was applied in a thin layer over the entire surface starting from the surface side.

Then, the pattern-forming surface was lightly dabbed here and there with a soft cloth sufficiently impregnated with alcohol.
At this time, the paint on the dabbed area began to diffuse along with the alcohol seeping out of the cloth, and as the alcohol evaporated, the paint stopped spreading. The diffusion pattern of the paint at this time was exactly like a marble pattern.

In this state, it was immediately dried with an air blower, and after drying, the marble pattern was fixed with a clear lacquer coating so that it would not peel off even if touched by hand. After that, a final coat of polyurethane resin paint was applied to protect the painted surface, and after drying, it was heated in a hot air oven at 100℃.
Baking was carried out for 40 minutes.

The vases produced in this way had a unique marble-like decoration that could not be obtained using conventional glazing methods, and could be mass-produced in a short time using simple equipment. However, the cured coating layer has durability, heat resistance, water resistance,
There were no practical problems in terms of physical properties such as stain resistance, weather resistance, impact strength, abrasion strength, gloss, and hardness.

[Effects of the Invention] The marble pattern according to the present invention is a decorative decoration that cannot be obtained by conventional glazing methods. In particular, a method of changing a pattern-forming agent and a base pattern (basic pattern) into a marble pattern using cloth impregnated with an organic solvent, and a method that uses different coloring agents such as dyes and pigments like pattern-forming agents. The technique of mixing, applying uniformly, and then applying an organic solvent to create a marble pattern by taking advantage of the difference in solubility is simply impossible with glazing.

Let the spray-painted undercoat or underpainting dry quickly, and then apply another layer of spray paint on top of it.
The technique of repeating this process and gradually completing the desired pattern or painting is only possible with quick-drying paint and paint that is already transparent at the time of application.

Despite the decoration that gives the image of very high-quality marble, the present invention does not require any skill to work.
In addition, quality control is easy and the occurrence of defective products can be minimized.

This is because while the coloring and decorative state of glazes can only be confirmed after firing, in the present invention, the coloring and marble patterns that appear during the painting process are confirmed as they are as the patterns of the final product. Because of this, it never happens that all the products are decorated with mistakes as a result of final firing as in the past.

The finishing process is completed at a much lower temperature and in a shorter time (80 to 120 degrees Celsius, 20 to 40 minutes) than in the case of glazing, so a wide variety of organic pigments and dyes that cannot be used with glazing are used in the undercoat and topcoat. Something happens.

Unlike conventional transfer painting methods, the manufacturing method of the present invention allows for free decoration of molded products with any complex curved surface, and the pattern is not uniform, but changes one by one. .

It is not the case that only one side of a molded product, such as transfer paper, is decorated with color. In addition, there are no seams or seams, and all desired surfaces can be equally decorated using the manufacturing method of the present invention.

By the manufacturing method of the present invention, it is possible to provide ceramic products such as tea bowls, coffee cups, plates, tiles, etc., which have the image of luxury marble products, at a relatively low cost, so it is expected that a new increase in purchasing desire will be achieved.

Claims (1)

[Claims] 1. Apply a partial undercoat of a specific color to one side of the ceramic after primer coating, apply a basic pattern coating through a masking plate with holes punched in a randomly curved shape, and apply a thin pattern forming agent to the entire surface. A marble-like pattern is applied by painting and partially buffing with an organic solvent. A coating is applied to fix this marble-like pattern. After the final coating, a forced baking is performed at 80 to 120 degrees Celsius for 20 to 50 minutes. A method for producing marble-patterned ceramics characterized by cooling.