KR100649608B1 - Composition of High-speed Type Water-base Printing Ink - Google Patents

Abstract

The present invention relates to an aqueous ink composition for high speed printing, and in particular, an acrylic emulsion resin, water, adjuvants, and a pigment in a suitable composition is mixed to form a small amount of scattering, drying speed is fast, there is no back stain, chemical resistance of the printed matter Provided is an aqueous ink composition for high speed printing which is improved and is excellent in the orientation and eco-friendliness of a henling pigment.

      High speed printing, water-based ink, flaky pigment

Description

      Aqueous ink composition for high speed printing {Composition of High-speed Type Water-base Printing Ink}

The present invention relates to an aqueous ink composition for high speed printing, and in particular, an acrylic emulsion resin, water, adjuvants, and a pigment in a suitable composition is mixed to form a small amount of scattering, drying speed is fast, there is no back stain, chemical resistance of the printed matter Provided is an aqueous ink composition for high speed printing which is improved and is excellent in the orientation and eco-friendliness of a henling pigment.

In addition, the aqueous ink composition is most suitable for screen printing, in addition to it can be used for gravure printing and flexo printing.

In general, screen printing spreads a mesh of nylon or Teflon or a wire woven into a wire, and a polymer valve is made by photochemical method to block the neck other than the necessary burn and When a printing ink is poured and moved while applying pressure to the inner surface of the screen with a pusher called a squeezer, the ink passes through the mesh of the non-valve portion and is transferred to a paper or a printed object lying under the plate.

Conventional screen printing machines have been used to print a printed object having a specific shape or volume, such as cloth, a container, a plastic bottle, various substrates, and ornaments, rather than a flat form such as paper or plastic film. As described above, conventional screen printing has used a general ink having a low drying speed because the printing speed is relatively low (3,000 sheets / hour) as it is used in special fields such as cloth printing, curved printing, and pad printing.

Such a conventional screen ink is generally composed of a resin, a pigment, a solvent and an auxiliary agent, and the resin is made of natural or synthetic resin, and the pigment has a relatively fine particle form. As a solvent, ketone, alcohol, Aliphatic or aromatic solvents are used in various ways, and auxiliaries have been used in various ways such as desiccants, waxes, fillers, etc. to improve the printability of the ink.

In addition, conventional screen printing inks mainly include a solvent evaporation type, an ultraviolet curing type, a solvent-ultraviolet curing type, and generally use a low boiling point solvent having a high evaporation rate or an ultraviolet curing method in order to increase printing speed. .

In connection with conventional screens, gravure, and flexo inks, various compositions using the ultraviolet curing method generally comprise a photopolymerizable compound and a photopolymerization initiator. Korean Patent Application No. 1987-14985 ("Solder Resist Ink Composition"), Korean Patent Application No. 2000-60509 ("Phosphorescent Printing Sheet and Photoluminescent Printing Ink Composition"), Korean Patent Application No. 1985-4601 ("Ultraviolet curing) Resin composition "), Republic of Korea Patent Application No. 195-59145 (" UV curing type high resolution and high productivity circuit forming resist ink composition for printed circuit board "), Republic of Korea Patent Application No. 2000-7009517 (" Curable resin composition, side Successful polymers and resin compositions, alkali developable photocurable glass pastes "), and the like, are directed to compositions comprising the photopolymerizable compound and a photopolymerization initiator.

      However, regarding the aqueous ink composition for high speed printing which the present invention intends to implement, Korean Patent Application No. 2001-24168 ("Aqueous Metallic Color Ink Composition") and Korean Patent Application No. 2000-73416 ("High gloss aqueous ink for writing instruments" Composition "), Korean Patent Application No. 2000-13818 (" Bright Water-based Ink Composition "), and Korean Patent Application No. 2000-78979 (" Bright Water-Based Ink ") and the like. The present invention relates to a water-based ink composition comprising a water-soluble resin such as copper powder or pearl, a water-soluble resin, a water-soluble organic solvent, and water. The ink compositions contain a large number of water-soluble organic solvents and are limited to writing instruments. There was a problem that it is not suitable for use for high speed printing.

      In addition, EP 1288269 A1 discloses a "water-based screen printing ink". However, since the ink includes a flake pigment, a water-soluble resin, water, a crosslinking agent, a catalyst, an auxiliary agent, and the like. The composition is very complicated, it is difficult to apply to high-speed printing because the drying characteristics of the ink are not described, and there is a problem that releasability of the ink may occur by using a catalyst or the like.

 Therefore, in order to solve the above problems, the present invention alternatively selects a solvent for high-speed drying of the aqueous ink, adjusts the viscosity and fluidity of the ink to prevent scattering (Misting or Flying) of the ink during printing, By providing an aqueous ink composition for high-speed printing composed of an auxiliary agent for good orientation of the pigment in the form on a paper-like surface, it dries well at high speed (3,000 sheets or more per hour) screen printing, and gets stuck when the printed matter is loaded. There is no off), and it is an object to make it excellent in chemical resistance, alkali resistance, and orientation property of a flaky pigment.

In addition, another object of the present invention is to provide an aqueous ink composition as described above so as to improve a problem of environmental pollution caused by an organic solvent.

In order to achieve the above object, the present invention is characterized by providing an aqueous ink composition for high-speed printing, which is prepared by mixing an alien pigment in an appropriate ratio with a mixture of a water-soluble resin, water that is a solvent, and an auxiliary agent.

The present invention relates to an aqueous ink composition for high-speed screen printing, and is composed of a water-soluble resin, water, an adjuvant, and a flaky pigment.

More specifically, it is composed of 20 to 25% by weight of water-soluble resin, 50 to 60% by weight of water, 4 to 10% by weight of adjuvant, and 16 to 23% by weight of flaky pigment.

The content of the flaky pigment in the composition ratio of the aqueous ink composition for high-speed screen printing is to achieve the optimum photo-variable effect, the content of the resin to have the durability required in the security ink. In addition, the content of the solvent can optimize the drying speed required for printing, the content of the auxiliary to maintain the optimum printability required for high-speed printing.

The water-soluble resin is composed of methyl methacrylate, butyl acrylate, methacrylic acid, etc. as a monomer, and the glass potential temperature is about 21 ° C. Have

In addition, the water-soluble resin is emulsified in water and used in the emulsion state, the resin (solid content) content in the emulsion is 35 to 55% by weight, preferably about 45% by weight.

Next, the flaky pigment is pearl, copper powder, silver powder, metal deposition powder, metal multilayer coating powder, or light variability with light variability effect which looks different depending on the viewing angle. At least one or more materials of the pigments are selected and made.

The particle size of the flaky pigment is 3 to 80 micrometers, and the particle thickness is about 0.1 micrometers to 2.0 micrometers, and has the glossiness of the metal and the rainbow or light variability effect.

In addition, the content of the flaky pigment is suitably 16 to 23% by weight, and among the flaky pigment, the flaky particles immediately after the ink is printed improve the print layer, the orientation, the ink storage property, and the viscosity of the ink. It is preferable to further include 1 to 3% by weight of fumed silica or transparent silicon dioxide for the control.

Next, the auxiliary agent is added in small amounts to make the aqueous ink have excellent printing characteristics. The adjuvant includes an antifoaming agent for preventing foaming during the ink manufacturing process, a dispersing agent for giving an optimum dispersion and surfactant effect of the pigment, a softening agent for preventing printability of the ink and abrasion of the printing plate, and viscoelasticity of the ink. Thickeners for inks and the like for adjusting properties are used. At this time, the antifoaming agent is used a silicone-based, the dispersant is used ammonium-based, the softening agent is used a polyethylene-based wax, the thickener is a urethane-based. In addition, an aziridine-based curing agent may be further used for curing the resin.

That is, the auxiliary agent is 0.5 to 1.5% by weight of the ammonium dispersant, 0.5 to 1.5% by weight of the silicone antifoaming agent, 1.0 to 3.0% by weight of the urethane thickener, 0.5 to 2.0% by weight of the polyethylene wax. Further, in the auxiliary agent, 0.5 to 2.0% by weight of an aziridine-based curing agent may be further used in order to smoothly cure the resin component when the ink is dried so that the printed matter has chemical resistance.

The ink prepared from the high-speed printing aqueous ink composition of the present invention, which is composed of a water-soluble resin, water, adjuvants and a pigment as described above, may be used for screen printing, gravure printing, flexographic printing, and printed matter printed with the aqueous ink. The pearlescent effect, the metal effect, the optically variable effect is included in the flaky pigment can be improved the quality of the printed matter, and can also highlight the anti-counterfeiting effect.

In addition, the aqueous ink composition can increase the adhesion and orientation of the pigment while appropriately accommodating the henling pigment, and can improve the chemical resistance and alkali resistance of the printed product.

Hereinafter, the high speed printing aqueous ink composition of the present invention will be described in more detail with reference to Examples.

Example 1

      In the present embodiment, the water-soluble resin was used as an acrylic emulsion of Neocryl XK-12 manufactured by Avecia, and the upper resin solid content of the water-soluble resin was fixed at 45% by weight. In addition, the above-mentioned photo-variable pigment was used as the henlin pigment, and the particle size distribution was 5 to 25 micrometers. In addition, water as a solvent was ionized water, dispersant, antifoaming agent, thickener, wax, and curing agent as an auxiliary agent. Was prepared in the same ratio as Table 1.

Raw material Raw material Optimum content (%) Suzy Acrylic emulsion 45.0 Fee Photovariable pigments 20.0 Fumed Silica (SiO ₂ ) 1.0 water Ionized water 28.5 Supplements Dispersant (ammonium type) 1.0 Defoamer (silicone system) 1.0  Thickener (Urethane System) 2.0 Wax (polyethylene type) 1.0  Curing agent (aziridine system) 0.5 Sum 100

In order to prepare the aqueous ink for high-speed screen printing as described above, an acrylic emulsion, a henlin pigment, water, an auxiliary agent, and the like were put in a container capable of mechanical agitation and mixed sufficiently. First, the acrylic emulsion and the fumed silica, a dispersant, an antifoaming agent and a wax as an auxiliary agent, and the ionized water in a mechanical stirrer for about 30 minutes at about 1,500 rpm, and then subjected to a photovariable pigment, The thickener and the ionized water are further mixed and subjected to secondary stirring at about 1,000 rpm for 90 minutes. Next, the curing agent and the antifoaming agent are mixed before the ink is used. Stirring speed and time as described above may vary depending on the size of the batch (Lot.).

The aqueous ink composition for high speed printing prepared in the same composition as in the above example maintained a viscosity of about 2,400 cps at 20 ° C.

The aqueous ink prepared from the aqueous ink composition was screen printed under the following conditions. The screen printing machine uses a rotary type that can print at a high speed of about 100-120m per minute. The screen plate uses 180 mesh to allow the light-variable pigment to fall out. The surface of the printed material is 40 ℃ for high speed drying. The printing characteristics and drying characteristics were visually investigated while continuously drying with hot air.

In addition, the printed matter printed with the aqueous ink composition according to the present invention was aged at room temperature for 3 days and treated with a solvent, an acid, an alkali chemical, and the like to examine the properties thereof in order to measure the chemical resistance of the printing ink layer.

Example 2

Example 2 was used by replacing the flaky pigment used in the aqueous ink composition of Example 1 with the product of the FLEX company in the United States, the particle size distribution of this flaky pigment was 5 to 40 micrometers. The amount of fumed silica was adjusted to 0.5% by weight, water (ionized water) as a solvent, and a dispersant, an antifoaming agent, a thickener, a wax, and a curing agent as an auxiliary agent were prepared by the ratios shown in Table 2.

Raw material Raw material Optimum content (%) Suzy Acrylic emulsion 45.0 Fee Photovariable pigments 20.0 Fumed Silica (SiO ₂ ) 0.5 water Ionized water 29.0 Supplements Dispersant (ammonium type) 1.0 Defoamer (silicone system) 1.0  Thickener (Urethane System) 2.0 Wax (polyethylene type) 1.0  Curing agent (aziridine system) 0.5 Sum 100

In addition, the ink production, the printing test, and the chemical resistance test were carried out under the same conditions as in Example 1.

(Comparative Example 1)

Comparative Example 1 is an aqueous ink composition excluding fumed silica in the composition of Example 1 was prepared in the ratio shown in Table 3.

Raw material Raw material Optimum content (%) Suzy Acrylic emulsion 45.0 Fee Photovariable pigments 20.0 Fumed Silica (SiO ₂ ) - water Ionized water 29.5 Supplements Dispersant (ammonium type) 1.0 Defoamer (silicone system) 1.0  Thickener (Urethane System) 2.0 Wax (polyethylene type) 1.0  Curing agent (aziridine system) 0.5 Sum 100

In addition, the ink production, the printing test, and the chemical resistance test were carried out under the same conditions as in Example 1.

(Comparative Example 2)

Comparative Example 2 is an aqueous ink composition excluding the aziridine-based curing agent in the composition of Example 1 was prepared in the ratio shown in Table 4.

Raw material Raw material Optimum content (%) Suzy Acrylic emulsion 45.0 Fee Photovariable pigments 20.0 Fumed Silica (SiO ₂ ) 1.0 water Ionized water 29.0 Supplements Dispersant (ammonium type) 1.0 Defoamer (silicone system) 1.0  Thickener (Urethane System) 2.0 Wax (polyethylene type) 1.0  Curing agent (aziridine system) - Sum 100

In addition, the ink production, the printing test, and the chemical resistance test were carried out under the same conditions as in Example 1.

      The chemical resistance test of printed matters printed using the ink composition prepared as in the above Examples and Comparative Examples was carried out under the conditions of temperature, time, and the like using the chemicals described in Table 5.

 division About product name Condition  Solvent Ethanol 30min. 25 ℃ Ethyl Acetate 30min. 25 ℃ Acetone 5min. 25 ℃ Trichloroethylene 30min. 25 ℃ Xylene 30min. 25 ℃ Perchlorethylene 30min. 25 ℃ Solvent Naphta 30min. 25 ℃ mountain Acetic acid 20%, 30 min. 25 ℃ Hydrochloric acid 5%, 30 min. 25 ℃ Sulfuric acid 2%, 30 min. 25 ℃ Alkali Caustic soda 2%, 30 min. 25 ℃ Other Soap solution 20min. 80 ℃ Hot water 10%, 30min. 80 ℃ Sodium Sulphide 30min. 25 ℃

Based on this, the results of visually examining the high speed printing characteristics, the drying characteristics, and the chemical resistance characteristics of the aqueous ink prepared with the ink compositions of the above examples and comparative examples are shown in Table 6.

 division  Example 1 Example 2 Comparative Example 1 Comparative Example 2  Printing characteristics  Ink scattering none  Slightly  Occur a lot none  Orientation of Pigments Good Good Good Good  Backing of prints  none none middle plenty  Drying properties Good Good Good Bad  Ink storage Good Good Bad Good  Chemical resistance Good Good Good Bad

As a result of the above test, various characteristics of the aqueous ink for high speed printing were good in Examples 1 and 2, but were poor in Comparative Examples 1 and 2 except the fumed silica and the curing agent.

      Therefore, the ink composition for high speed printing according to the present invention is suitable for preventing scattering of ink, good orientation of pigment after printing, anti-backing property when loading printed matter, excellent drying property, anti-sedimentation property during long-term storage of aqueous ink, and chemical resistance of printed matter. It can be seen from the above embodiments that there is an effect.

While the present invention has been described with reference to the embodiments, it is only for the purpose of illustrating the invention, and those skilled in the art to which the present invention pertains various modifications or equivalent embodiments from the detailed description. I can understand. Therefore, the true scope of the present invention should be determined by the technical spirit of the claims.

The aqueous ink composition for high speed printing according to the present invention as described above has little scattering, fast drying speed, no backing, excellent chemical resistance of printed matter, and water as a solvent instead of the orientation of the pigment and water-soluble organic solvent. By using these, there are excellent effects such as environmental friendliness.

In addition, the aqueous ink composition may be used for screen inks as well as for gravure water inks and flexo water inks.

Claims (6)

An aqueous ink composition for high speed printing, comprising: an acrylic component composed of methyl methacrylate, butyl acrylate, and methacrylic acid, 20 to 25% by weight of a water-soluble resin having a glass potential temperature characteristic of 21 ° C .; 50 to 60 weight percent of water; 4 to 10% by weight of an adjuvant which is a mixture of an ammonium dispersant, silicone antifoaming agent, urethane thickener, polyethylene wax, and aziridine curing agent; An aqueous ink composition for high-speed printing, comprising 16 to 23% by weight of a flaky pigment selected from pearl powder, copper powder, silver powder, gold powder, metal deposited powder, metal multilayer coating powder, and photo variable pigment. delete delete The method of claim 1, The adjuvant, The mixing ratio of the ammonium dispersant, silicone antifoaming agent, urethane thickener, polyethylene wax, and aziridine-based curing agent is 0.5 to 1.5% by weight: 0.5 to 1.5% by weight: 1.0 to 3.0% by weight: 0.5 to 2.0% by weight: 0.5 to 2.0% by weight An aqueous ink composition for high speed printing, characterized in that. delete The method of claim 1, The flaky pigment, An aqueous ink composition for high speed printing, further comprising 1 to 3% by weight of fumed silica or transparent silicon dioxide.