JPS5845956B2 - Method for improving heated transfer materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method of forming an alumina film or a silica film on the surface of an inorganic material or a metal material, and heat-transfer printing a character pattern made of a sublimable coloring agent on this film (Japanese Patent Application No. 1983).
-150137, Japanese Patent Application No. 52-88124).

That is, the above invention has problems in chemical resistance and steam resistance when used under extremely severe conditions, particularly when used in the presence of organic solvents or in steam for a long time.

,,Furthermore, when a colorant with poor light resistance was used, there was also a problem with fastness.

The present invention is aimed at improving these drawbacks, and is characterized by coating colloidal alumina and/or colloidal silica on the transfer surface and drying it, which has excellent chemical resistance and weather resistance. This is a method for improving heated transfer materials.

Conventionally, when coloring glass etc., a method has been used to produce colored products by adding a coloring agent to a glass batch, but when a colored glass product with multiple colors is desired,
At some degrees Celsius, there are manufacturing problems when partially coloring this product.

In addition, methods for printing on inorganic materials include silk screen printing and slide transfer printing, but these have complicated printing processes and require a long baking time of 1 to 3 hours after printing. The efficiency was poor, and most of the colorants were opaque pigments.

On the other hand, as a method to improve the above-mentioned drawbacks, there are methods of coating glass, ceramics, porcelain, slate, concrete, etc. with a synthetic resin film, and dyeing this film with dyes or thermal transfer printing. Not only is it difficult to form a thin film due to poor abrasion resistance, heat resistance, nonflammability, and surface smoothness, but the types of synthetic resins are also limited due to the adhesive strength between the film and the base material. Under the circumstances.

Therefore, the present inventors coated an inorganic material or a metal material with colloidal alumina or colloidal silica, dried and fired it, and created an ink containing a sublimable colorant on the resulting alumina or silica film. Transfer foils with character designs formed thereon are overlaid and heated under pressure to form character designs on alumina or silica film.Features abrasion resistance, heat resistance, nonflammability, surface smoothness, and thin film forming properties. Although we invented a heat transfer printing method that provides excellent decorative materials, it is difficult to print the transferred material in extremely harsh environments, especially when used in the presence of organic solvents or in steam for long periods of time. Furthermore, when a colorant with poor light fastness was used, there was also a problem with fastness.

Prior to carrying out the present invention, colloidal alumina or colloidal silica is coated on inorganic materials such as glass, hollow, ceramic slate, and concrete, and metal materials such as iron, zinc, copper, and aluminum, dried, and fired to form alumina. Alternatively, after forming a silica film, heat transfer is performed using a transfer foil containing a sublimable colorant, and then a top coating is applied to the transfer surface.

Colloidal alumina as a top coating material is
Even if it is a sol called boehmite color obtained by hydrolyzing basic aluminum chloride or aluminum acetate,
Even if it is a sol made by peptizing a gel.

Also, some gel is mixed in L・But it is okay L
77. If importance is placed on coating workability, thin film forming properties, and film uniformity. Contains almost all of the components (
・Preferably low viscosity materials.

Conversely, in order to increase the viscosity, an alkali or salt solution can be added as long as it does not impair film-forming properties.

Colloidal silica as a top coating material may be a silica made by any of the following methods, such as acid decomposition of water glass, electrolytic dialysis, hydrolysis, gel peptization, ion exchange, etc.

Colloidal alumina or colloidal silica can be used alone or in a mixture.

However, when mixing, it is necessary to pay attention to the charge and pH of the particles and to adjust the temperature to avoid rapid gelation.

The mixing ratio may be 1 to 99% of colloidal a) I/N and 99 to 1% of colloidal silica, but if the emphasis is on improving weather resistance, colloidal 90-10% alumina, 10-10% colloidal silica
A mixing ratio of 90% is preferred.

Furthermore, organic or inorganic substances such as ultraviolet absorbers and viscosity modifiers may be added to the top coating material.

The top coating method depends on the size of the base material, flat surface, curved surface,
An appropriate method should be selected depending on the surface roughness, etc., and generally a casting method, a spray method, a roll coating method, a dipping method, a brush coating method, etc. can be adopted.

After top coating, drying is carried out, but the drying temperature is preferably as high as it does not affect the colorant, usually 90 to 280°C, preferably io.

~220°C.

In particular, since the alumina film as the top film is fired at a high temperature, it is not porous (the coloring agent will not sublimate and the degree of coloring will not decrease).

The silica film also prevents the fastness of the colorant from decreasing.

A top coat film with a thickness of about 0.5 to 10 μm is sufficient, and has excellent chemical resistance, weather resistance, abrasion resistance, heat resistance, and nonflammability, and is suitable for a variety of applications such as interior materials and Efsteria materials. Applied.

Furthermore, since the film is uniform and can be made thin, the refractive index is −i, which directly reflects the quality of the surface of the base material, making it suitable for decorative purposes.

Next, the present invention will be specifically explained with reference to Examples.

Example 1 Colloidal alumina produced by peptizing an alumina film (
Boehmite (solid content: 10% by weight, pH 4) was applied to a glass plate, dried at 75°C, and then fired at 550'C for 1 hour. As a result, a transparent d-flu □ film with a thickness of 5 μm was obtained.

Next, the disperse dye manufactured by Sumitomo Chemical Co., Ltd. (TS-WBLUE)
The printed surface of the transfer paper printed with 603) and the aluminum film surface were overlapped, and the pressure was 0.5 kf//ca and the temperature was 200°C.
When pressed for 1 minute, a transparent color print was obtained.

Next, apply the above colloidal alumina to the transfer surface and heat it to 200°C.
As a result, a boehmite film with a thickness of 3 μm was obtained, and there was no change in color even when it was immersed in toluene at a temperature of 50°C for 24 hours, and the color did not change even when exposed to steam at 150°C for 1 hour. No changes were observed.

Example 2 Colloidal silica (pH 9.5, solid content: 20% by weight) was applied to a porous absorption plate, dried at 90°C for 2 hours, and then baked at 600°C for 30 minutes.

Next, disperse dye manufactured by Sumitomo Chemical ■ (TS-WBLUE)
The printed side of the transfer paper printed with 603) and the silica film side were overlapped, and the pressure was 0.5@/cfL and the temperature was 200°C.
A color print was obtained after pressing for a minute.

In the next step L, the above colloidal silica was spray coated on the transfer surface, dried at 200°C to form a film with a thickness of 2 μm, and then immersed in methanol at a temperature of 30°C for 24 hours without any color change. In the weather test, no color change was observed even after 70 hours of irradiation.

Example 3 Colloidal alumina obtained by the method of Example 1 was applied onto a tile that had been degreased with trichlene, and after air drying, it was heated at 550°C for 1 hour.
After baking for a period of time, a transparent d-alumina film with a thickness of 6 μm was obtained.

Next, disperse dye manufactured by Sumitomo Chemical ■ (TS-WRED)
The printed surface of the transfer paper printed with 603) and the alumina film surface were overlapped at a pressure of 0.1 kg/crtt and a temperature of 190 ml.
When pressed for 2 minutes at ℃, a clear color print was obtained.

In the next L, the colloidal alumina used in Example 1 is converted to a solid content of 70 weight φ of colloidal silica (pH 4)
was mixed with 30 parts by weight in terms of solid content, coated on the transfer surface of the above-mentioned transfer material, and dried at 200°C.

The thickness of the film is 3 μm, the hardness is 5H, and it was heated at 50°C.
No change in color was observed even after immersion in ethanol for 24 hours, and no particular fading was observed even after 3 months of outdoor exposure.

Claims (1)

[Claims] 1. In a method of thermally transferring a character design onto an alumina film or a silica film obtained from colloidal alumina or colloidal silica, a transfer foil containing a sublimable colorant is used. A method for improving a heated transfer material, comprising applying colloidal alumina and/or colloidal silica to a transfer surface and drying the coated material.