KR20080070096A - Primer composition for glass printing and printing method thereby - Google Patents

Abstract

A primer composition for glass printing is provided to enable direct printing on glass without using any special ink, and to minimize interlayer separation or deformation of a printed pattern after the printing. A primer composition for glass printing comprises: an urethane resin represented by the following formula 1 and obtained from the reaction between a polyester polyol and polyisocyanate; dipropylene glycol monomethyl ether(CAS No. 34590-94-8); and at least one solvent selected from the group consisting of ethyl acetate (CAS No. 141-78-6), butyl acetate(CAS No. 123-86-4) and toluene(CAS No. 108-88-3). The primer comprises 40-50 wt% of the urethane resin and 2-10 wt% of dipropylene glycol monomethyl ether based on 100 wt% of the primer composition.

Description

Primer composition for glass printing and glass printing method using the composition

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a primer composition for glass printing, and more particularly, to a primer composition which is applied to glass in a step before directly printing on glass to improve adhesion of ink to be printed thereafter and maintains the shape of the print without deformation. .

Many methods have been developed and applied to express specific colors and designs in existing glass or glass ceramic products. Examples of glass exhibiting such colors, patterns, and the like include film laminated glass, laminated glass, color glass, etching glass, art glass, and the like.

Film-bonded glass is a method of expressing colors and patterns expressed on the sheet paper by attaching sheet paper printed with patterns onto glass. Laminated glass is a fabric, wallpaper, etc. inserted between a pair of glass, and It is a method of laminating a pair of glass. In addition, the color glass is simply a monochromatic glass coated only on the glass, the etched glass refers to the glass engraved with the pattern by sand sand, and the art glass refers to the glass made by carving the colored glass.

However, since the film laminated glass adheres the film to the glass surface, it degrades the nature of the glass, and there is a phenomenon of peeling and discoloring and discoloration after a certain time. Laminated glass is laminated using general materials (fabric, wallpaper, etc.) in the market, so there is a limit of applied materials, and there are many limitations in terms of expressive power, and double glass work results in double material value. Etched glass has many limitations in terms of color and pattern and causes environmental problems. Color glass is very simple in operation, but only glass having a simple color can be produced, thereby limiting the expression very much.

For this reason, conventional ink was printed directly on glass using silk screen printing (also called screen printing for short) or offset printing using a special ink applied to glass.

Silk screen printing is generally made of a screen made of silk or chemical fiber in tension, and a portion of the non-flammable part is covered with paper or glue, and then ink is applied thereon. When attached, the ink is printed on the screen only through the screen. Such printing inks are used for fast drying and good adhesion. After printing, they are transferred to a kiln and heated and cooled, and the oily pigment is removed from the ink while the glass pigment is fused onto the glass surface. do.

Printing is often hand-printed to push ink with a squeegee, but silk-screen printing is also used. The feature of this printing is that the ink layer is very thick, suitable for fluorescent ink and the like, and the number of colors can be used freely. It is used for a small number of copies, such as a poster, cloth, or large signboard. It can also print on any print, such as glass, ceramics or metal. Instead, it is not suitable for many copies or precision prints because of its small printing strength and difficulty in expressing delicate lines and dots.

In the case of offset printing, printing is not done directly on a printed matter on a plate, but by transfer printing on a rubber blanket serving as an intermediary, and then printing on paper.

However, offset printing has the disadvantage of printing through one more step, and in the case of direct printing on the glass, the print area is not completely adhered to the glass by any print due to the characteristic of the glass that the friction coefficient is extremely small. As a result, after a certain time, the glass and the printed area were peeled off or dropped when subjected to a physical impact.

On the other hand, when a solvent (thinner component) was added to the print site, the print site melted or cracked, resulting in deformation of the print body. In other words, when a paint containing a thinner component (solvent) is added to finish the glass after printing, the printed part is deformed due to the solvent component.

As to solve the above problems,

An object of the present invention is to provide a means that can be directly printed on the glass without a special ink in consideration of the adhesion to the glass.

In addition, an object of the present invention is to provide a means for minimizing the peeling phenomenon or deformation of the print shape even if printed directly on glass.

In order to achieve the above technical problem,

Primer composition for glass printing according to the present invention is a urethane resin having a reaction structure of the following (1) by the curing reaction of the polyester polyol and polyisocyanate;

Dipropylene glycol monomethyl ether (cas no 34590-94-8); And

Solvents comprising at least one selected from the group consisting of ethyl acetate (cas number 141-78-6), butyl acetate (cas number 123-86-4) and toluene (cas number 108-88-3) : Consists of

Furthermore, the primer composition for glass printing according to the present invention is based on 100% by weight of the primer composition for glass printing, the urethane resin 40 to 50% by weight, the dipropylene glycol monomethyl ether (cas number 34590-94-8) 2 to 10% by weight %: May contain.

Furthermore, the solvent according to the present invention is based on 100% by weight of the primer composition for glass printing, 20-25% by weight of ethyl acetate (cas number 141-78-6), butyl acetate (cas number 123-86-4) 10 to 15% by weight, toluene (cas number 108-88-3) may be composed of 15 to 20% by weight.

On the other hand, the printing method using the primer composition for glass printing according to the present invention comprises the first step of applying the primer composition for glass printing by a spray method; Drying the applied primer composition; A third step of printing an image on the primer coating layer; And a fourth step of curing the printed image.

Furthermore, the method may further include applying a background color onto the glass surface printed by the second step.

Further, the glass printing primer composition used in the printing method using the primer composition for glass printing according to the present invention comprises a urethane resin having a reaction structural formula of (1) below by curing reaction of a polyester-based polyol and a polyisocyanate; Dipropylene glycol monomethyl ether (cas no 34590-94-8); And at least one selected from the group consisting of ethyl acetate (cas number 141-78-6), butyl acetate (cas number 123-86-4) and toluene (cas number 108-88-3) Solvent: can consist of.

Next, a preferred embodiment of the present invention will be described in detail.

The primer for glass printing according to the present embodiment includes urethane resin, dipropylene glycol monomethyl ether, and a solvent as its main components.

Usually urethane resin is a synthetic polymer having a urethane bond in the main chain. As a polyurethane-based synthetic fiber, spandex, polyurethane sponge, urethane rubber, urethane paint and the like have been put to practical use.

The urethane resin in the present Example is a two-component urethane paint using a reaction for forming a urethane bond through a curing reaction of a polyester polyon and a polyisocyanate.

Polyester polyol is a high molecular weight polymer having ester bonds by condensation polymerization of polyhydric acids (phthalic acid, adipic acid, maleic acid, etc.) and polyhydric alcohols (ethylene glycol, butylene glycol, diethylene glycol, etc.). Give it a characteristic.

The reaction structure of the polyester polyol is generally as follows.

Polyisocyanate is a compound with 7-10% NCO%, which gives the property of increasing the curing speed and improving solvent resistance, wear resistance and adhesion in a typical two-component urethane coating system.

The urethane resin formed through the curing reaction of the polyester polyol and the polyisocyanate serves to increase the adhesive strength with the ink used for printing, and the reaction structure is represented by the following (1).

Dipropylene glycol monomethyl ether is cas number 34590-94-8 which enhances the adhesion of the primer to the glass.

In this embodiment, an organic solvent is used to dissolve the urethane resin and dipropylene glycol monomethyl ether well so that proper mixing is achieved and to easily apply a primer, which is a final composition, to the glass. The solvent according to this embodiment is composed of ethyl acetate (cas 141-78-6), butyl acetate (cas 123-86-4) and toluene (cas 108-88-3).

On the other hand, in addition to the ethyl acetate, methyl acetate, and toluene used in this embodiment, the urethane resin and the dipropylene glycol monomethyl ether can be dissolved in a mixed state and made to be coated on glass. Other organic solvents may also be used.

The primer composition according to the present embodiment preferably contains 40 to 50% by weight of urethane resin and 2 to 10% by weight of dipropylene glycol monomethyl ether based on 100% by weight. The adhesion test results of the primer composition in addition to the appropriate content are shown in the following table.

ingredient Proper Content Experimental results outside the proper content Urethane Resin 40-50% by weight Ink adhesion decreases when it contains less than 40% by weight In case of containing more than 50% by weight, glass adhesion is deteriorated Dipropylene glycol monomethyl ether 2-10% by weight Glass adhesion is poor when it contains less than 2% by weight If it contains more than 10% by weight, ink adhesion is poor

Ethyl acetate, butyl acetate and toluene are used as the solvent of this embodiment, based on 100% by weight of the primer composition, 20-25% by weight ethyl acetate, 10-15% by weight butyl acetate, and toluene It is preferable to contain 15-20% by weight.

The appropriate minimum content of each component means the minimum amount that can be sufficiently dissolved in the solvent, the optimum maximum content is that the solvent is evaporated into the air after applying the primer composition to the glass, that is, taking into account the drying time. Therefore, the high and low content of the solvent does not have much influence on the role of the entire main component.

The glass printing method using the primal for glass printing of this embodiment with the effect | action by this embodiment is demonstrated.

As a method for printing on glass,

The first step is to apply the glass composition primer composition according to the present embodiment to the glass by the spray method. The primer composition does not need to be uniformly applied to the glass with high precision, and even if it is non-uniform, it may serve as a primer when applied to the glass in small amounts.

After a certain time after applying the primer composition according to the above configuration, the solvent consisting of ethyl acetate, methyl acetate, toluene, and the like is evaporated to leave only the urethane resin and the dipropylene glycol monomethyl ether component on the glass.

The second step is to apply the primer composition and then to dry. The time taken for the solvent to evaporate and dry the primer composition according to the present example usually takes about 20 to 30 minutes at room temperature.

The third step is to print an image, preferably to print an already determined image by u-v inkjet printing. Printing on the dried primer layer using u-v ink maintains the adhesion of the primer layer to the glass and the u-v ink.

The fourth step is to cure the printed image. The reason for using u-v ink in particular in the third step is to consider the fast drying time. u-v ink refers to an ink that dries rapidly due to a photochemical reaction with energy of ultraviolet rays. After printing using u-v ink, the ink can be dried quickly using an ultraviolet drying device. By adjusting the wavelength of the ultraviolet light used in the drying device may be adjusted to dry at the same time as printing.

As the ultraviolet ray drying device, a light source device or an ultraviolet ray irradiation device is mainly used.

There are many methods for the light source device that emits ultraviolet rays, but the most commercially useful method is a method of encapsulating mercury in a transparent container so as to easily emit large amounts of ultraviolet rays and causing discharge therein. As is well known, mercury liquefies at low temperatures and has a high vapor pressure. Therefore, it is one of the optimal materials for the ultraviolet emitting material. Currently commercially available UV irradiation devices use special high pressure (or medium and low pressure) mercury lamps and usually have a power output of 80 W / cm (200 W / inch).

In the case of UV irradiator, the distance between the lamp's reflex mirror and the body is slightly different depending on the UV irradiator manufacturer, but usually 8-10cm is suitable. There are two types of reflecting mirrors, elliptical and parabolic reflectors. Oval reflectors are focused and cured in a short time for special high pressure irradiation because of their high energy per unit area. Parabolic reflectors, on the other hand, are reflected by parallel rays, so they are used for three-dimensional objects and wheels of the PARTICAL BOARD. Therefore, the UV irradiation apparatus should consider the efficiency of the lamp, the cooling of the lamp, the exhaust stability, the operation method, etc. when installing.

After the desired printing is performed by the two steps, the method may further include a post-process step. In this step, a desired background color such as translucent paint or white paint is applied onto the glass surface printed by the second step.

The printed glass is then observed and viewed from the opposite side of the printed glass surface.

Although preferred embodiments of the present invention have been described above, the technical spirit of the present invention is not limited to the above-described preferred embodiments, and various primer compositions for glass printing in the scope not departing from the technical spirit of the present invention specified in the claims. It can be implemented as.

From the above structural features,

The primer composition according to the present invention enables direct printing on a glass surface or the like by using an ink in consideration of characteristics necessary for printing, such as a curing speed, in general, without considering a special ink in consideration of adhesion to glass and the like.

In addition, the primer composition according to the present invention does not cause any deformation or discoloration even if any solvent is added to the printed site.

In addition, since the primer composition according to the present invention can be directly printed without using a special method on the glass to enable a variety of printing without limitation of expression.

Claims (6)

Urethane resin which has the reaction structural formula of (1) below by hardening reaction of polyester polyol and polyisocyanate; Dipropylene glycol monomethyl ether (cas no 34590-94-8); And Solvents comprising at least one selected from the group consisting of ethyl acetate (cas number 141-78-6), butyl acetate (cas number 123-86-4) and toluene (cas number 108-88-3) : A primer composition for glass printing.

The method of claim 1, Based on 100% by weight of the primer composition for glass printing, 40 to 50% by weight of the urethane resin, 2 to 10% by weight of the dipropylene glycol monomethyl ether (cas No. 34590-94-8): A primer composition for printing a glass. The method according to claim 1 or 2, The solvent based on 100% by weight of the primer composition for glass printing, 20 to 25% by weight ethyl acetate (cas number 141-78-6), 10 to 15% by weight butyl acetate (cas number 123-86-4), 15 to 15 toluene (cas number 108-88-3) A primer composition for glass printing, comprising 20% by weight. A first step of applying a glass composition primer composition by a spray method; Drying the applied primer composition; A third step of printing an image on the primer coating layer; And The fourth step of curing the printed image: a printing method using a primer composition for glass printing. The method of claim 4, wherein A printing method using the primer composition for glass printing, further comprising the step of applying a background color on the glass surface printed by the second step. The method according to claim 4 or 5, The primer composition for glass printing, Urethane resin which has the reaction structural formula of (1) below by hardening reaction of polyester polyol and polyisocyanate; Dipropylene glycol monomethyl ether (cas no 34590-94-8); And Solvents comprising at least one selected from the group consisting of ethyl acetate (cas number 141-78-6), butyl acetate (cas number 123-86-4) and toluene (cas number 108-88-3) : Printing method using a primer composition for glass printing consisting of.