KR102025127B1 - Alcohol-based ink composition for printing - Google Patents

Abstract

The present invention relates to an alcohol-based printing ink composition, the ink composition of the present invention is a polyurethane resin; Mixed solvents containing at least one selected from the group consisting of acetic acid, propyl acetate and ethanol; And by including a pigment, it is possible to realize the printing quality of excellent adhesion, color development, etc., without the use of benzene, toluene, xylene, ethyl acetate, as well as environmentally friendly.

Description

Alcohol-based printing ink composition {ALCOHOL-BASED INK COMPOSITION FOR PRINTING}

The present invention relates to an alcohol based printing ink composition.

Flexo printing, gravure printing, inkjet printing, screen printing to color or form patterns on various types of substrates such as wrapping paper, labels, wallpaper, envelopes, paper, diapers, etc. Printing methods such as (Screen printing) are utilized.

In general, the ink used for printing is made of a resin, a solvent, a pigment, an additive, and the like, and benzene, toluene, xylene, and ethyl acetate are mainly used as the solvent. As an example, Korean Patent No. 10-0479636 discloses an ink composition for gravure printing including an acrylic resin, a cellulose acetate butylate compound, toluene, methyl ethyl ketone, xylene, polyethylene wax, isocyanate and a dispersant.

However, benzene, toluene, xylene, and ethyl acetate, which have been conventionally used, including the registered patent, have a problem of generating a large amount of volatile organic compounds (VOC: Volatile Organic Compoudsd) as well as polluting the environment. In particular, the volatile organic compounds generated during the manufacture, use, and disposal of the ink to which the benzene, toluene, xylene, and ethyl acetate are applied or the volatile organic compounds discharged from the product to which the ink is applied penetrate into the human respiratory organ, skin, and the like. There was a problem that caused the disease.

In order to solve this problem, development of environmentally friendly inks excluding the use of BTX-free (excluding the use of benzene, toluene and xylene) and ethyl acetate is underway. For example, the Republic of Korea Patent No. 10-0938199 discloses a gravure printing ink composition containing an aqueous solvent, zeolite, antibacterial agent, sodium chloride, etc., including ethanol, hydrogen peroxide, etc., the patent is benzene, toluene, xylene And only consider to exclude the use of ethyl acetate but not enough to improve the print quality there was a problem that the print quality was not excellent.

Accordingly, the use of benzene, toluene, xylene, ethyl acetate is excluded, and development of an ink which is environmentally friendly and has excellent print quality is required.

Republic of Korea Patent No. 10-0479636 Republic of Korea Patent No. 10-0938199

An object of the present invention is a polyurethane resin; One or more mixed solvents selected from the group consisting of acetic acid, propyl acetate and ethanol; And a pigment, thereby providing an environmentally friendly alcohol-based ink composition that can realize excellent print quality without the use of benzene, toluene, xylene, ethyl acetate.

The object of the present invention is not limited to the technical problem as described above, another technical problem can be derived from the following description.

In order to achieve the above object, the present invention is a polyurethane resin; Mixed solvents containing at least one selected from the group consisting of acetic acid, propyl acetate and ethanol; And a pigment; provides an ink-based printing ink composition comprising.

The ink composition may include 20 to 60 wt% of the polyurethane resin, 20 to 70 wt% of the mixed solvent, and 5 to 25 wt% of the pigment based on the total weight of the ink composition.

The mixed solvent may include acetic acid, propyl acetate and ethanol in a weight ratio of 2 to 1: 2 to 1: 1.

The mixed solvent may include acetic acid and ethanol in a weight ratio of 3 to 1: 1.

The mixed solvent may include propyl acetate and ethanol in a weight ratio of 3 to 1: 1.

The polyurethane resin may have a polymerization degree of 40,000 to 60,000.

The ink composition may further include a sapwood sap.

The ink composition may have a viscosity of 100 to 200 cP.

The ink composition may further include at least one additive selected from the group consisting of a dispersant, an antifoaming agent, a light stabilizer, a binder, a pH adjusting agent, and a drying rate adjusting agent.

Alcohol-based printing ink composition of the present invention is a polyurethane resin; One or more mixed solvents selected from the group consisting of acetic acid, propyl acetate and ethanol; And by including a pigment, it is possible to achieve a print quality similar to the conventional ink using environmentally friendly benzene, toluene, xylene, ethyl acetate as a solvent by not using benzene, toluene, xylene, ethyl acetate as a solvent.

In addition, the ink composition of the present invention can be applied to various types of printing paper as well as excellent in color development and adhesion (adhesion performance of the ink to paper). Accordingly, print quality can be improved.

1 is a view showing a product (packaging) to which the alcohol-based printing ink composition is applied according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

The terms or words used in the specification and claims of the present invention are not to be construed in a conventional or dictionary sense, and the inventors may appropriately define the concept of terms in order to best explain their invention in the best way. Based on the principle, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Throughout the specification of the present invention, when a part is said to "include" a certain component, it means that it can further include other components, without excluding the other components unless otherwise stated. .

In the specification of the present invention, "A and / or B" means A or B, or A and B.

The present invention provides an ink-based printing ink composition.

Alcohol-based printing ink composition according to an embodiment of the present invention is composed of a polyurethane resin, a mixed solvent, a pigment, as the mixed solvent includes at least one selected from the group consisting of acetic acid, propyl acetate and ethanol, benzene, The use of toluene, xylene, and ethyl acetate is excluded, so that printing quality such as color development, ink adhesion, etc. may be excellent. The print quality may be determined by the adhesion, color development, scratch resistance, durability, and proper drying speed of the ink during printing.

In particular, the ink composition of the present embodiment may include 20 to 60% by weight of the polyurethane resin, 20 to 70% by weight of the mixed solvent and 5 to 20% by weight of the pigment based on the total weight of the ink composition.

The polyurethane resin can improve the viscosity and adhesiveness while giving the coating performance of the ink composition of this embodiment. In this embodiment, by using a polyurethane resin having a polymerization degree of 40,000 to 60,000, it is possible to further improve the adhesion and color developing power of the ink composition. If the degree of polymerization of the polyurethane resin of the present embodiment is less than 40,000, there may be a problem that the viscosity of the ink composition is lowered, the adhesive force is lowered, and if the degree of polymerization of the polyurethane resin exceeds 60,000, the viscosity of the ink composition is too high There may be a problem that the color development power is lowered and the surface of the printed matter is not smooth.

In addition, the polyurethane resin of a present Example can be obtained by making a polyol, polyisocyanate, and polyether monoalcohol react.

The polyol may be ethylene glycol, propylene glycol, butylene glycol, hexamethylene glycol, neopentyl glycol, polyethylene glycol (PEG) compound, polypropylene glycol (PPG) compound, glycerin and the like, but is not limited thereto.

The polyisocyanate may be used without particular limitation so long as it has two or more isocyanate groups in a molecule, and may be, for example, isophorone diisocyanate, methylenediphenyl diisocyanate, tetramethylxylene diisocyanate, methylene diisocyanate, or the like. This is not restrictive.

The polyether monoalcohol can be applied without limitation as long as it is a polyether of straight chain and branched chain or secondary monohydric alcohol. The polyether of the straight chain and branched chain or secondary monohydric alcohol is alkylene oxide such as ethylene oxide, propylene oxide, butylene oxide, epichlorohydrin and the like in the straight chain and branched chain or secondary monohydric alcohol. It can be obtained by addition polymerization.

The ink composition of the present embodiment may include 20 to 60% by weight, preferably 25 to 55% by weight, and more preferably 30 to 45% by weight, based on the total weight of the ink composition. If the polyurethane resin is included in an amount less than 20% by weight based on the total weight of the ink composition, there may be a problem in that the adhesion of the ink composition is reduced while the film performance is deteriorated, and the polyurethane resin is 60 weight based on the total weight of the ink composition. If it is included in more than%, the viscosity of the ink composition is too high to reduce the workability during printing as well as the color development power may be lowered, there may be a problem that the surface of the substrate is not smooth.

The mixed solvent controls the viscosity and drying speed of the ink composition while helping the mixing of each component such as a polyurethane resin and a pigment, and may affect the adhesion and color developing power of the ink composition.

The mixed solvent of this embodiment may include one or more selected from the group consisting of acetic acid, propyl acetate and ethanol. In particular, the mixed solvent of the present embodiment (a) when acetic acid, propyl acetate and ethanol are included in the weight ratio of 2 to 1: 2 to 1: 1, (b) acetic acid and ethanol are included in the weight ratio of 3 to 1: 1 If (c) propyl acetate and ethanol may be one selected from the case included in the weight ratio of 3 to 1: 1.

The mixed solvent of this embodiment may include (a) acetic acid, propyl acetate and ethanol in a weight ratio of 2 to 1: 2 to 1: 1, preferably acetic acid, propyl acetate and ethanol of 2: 1: 1 It may be included in the weight ratio. By using the mixed solvent (a) as described above, the ink composition of the present embodiment can realize printing characteristics similar to those of conventional inks without using benzene, toluene, xylene, and ethyl acetate, and can be environmentally friendly.

The mixed solvent (b) of this embodiment may contain acetic acid and ethanol in a weight ratio of 3 to 1: 1, preferably acetic acid and ethanol in a weight ratio of 3 to 2: 1, more preferably acetic acid and Ethanol may be included in a weight ratio of 3: 1. By using the mixed solvent (b) as described above, the ink composition of the present embodiment can realize printing characteristics similar to those of conventional inks without using benzene, toluene, xylene, and ethyl acetate, and can be environmentally friendly.

In the mixed solvent (c) of the present embodiment, propyl acetate and ethanol may be included in a weight ratio of 3 to 1: 1, preferably, propyl acetate and ethanol may be included in a weight ratio of 3 to 2: 1, and more preferably Propyl acetate and ethanol may be included in a weight ratio of 3: 1. By using the mixed solvent (c) as described above, the ink composition of the present embodiment can realize printing characteristics similar to those of conventional inks without using benzene, toluene, xylene, and ethyl acetate, and can be environmentally friendly.

The concentration of ethanol in the mixed solvent is 80 to 95%, preferably 85 to 95%, more preferably 90%. If the concentration of ethanol is less than 80%, the drying rate is slow, and if the concentration of ethanol is more than 95%, there is a problem that the drying rate is faster, resulting in deterioration of printability and usability.

In particular, as described above, it is preferable that a small amount of ethanol is added to acetic acid and / or propyl acetate, and when ethanol is added in excess, the drying rate of the ink (= solvent evaporation rate) is very fast, and the adhesion of the ink composition is increased. Coloring power may be lowered. In addition, when the mixed solvent deviates from the weight ratio according to the above (a) to (c), it is difficult to control the drying speed and viscosity of the ink composition, and thus there may be a problem in that print quality such as color development power, adhesion strength, and the like decreases.

The ink composition of this embodiment comprises 20 to 70% by weight, preferably 30 to 65% by weight, more preferably 40 to 60% by weight of the mixed solvent of acetic acid, propyl acetate and ethanol based on the total weight of the ink composition. can do. If the ink composition contains less than 20% by weight of the mixed solvent based on the total weight of the ink composition, the viscosity of the ink composition may be too high, the drying speed may be slow, and the pigment may not be sufficiently dispersed, resulting in poor print quality such as adhesion and color development. There may be a problem. On the other hand, when the mixed solvent is contained in an amount of more than 70% by weight based on the total weight of the ink composition, the viscosity of the ink composition is too low and thin, and as the drying speed is increased, print quality such as adhesion and color developing power is deteriorated. There can be.

Pigments may typically comprise one or more selected from the group consisting of red pigments, white pigments, green pigments, blue pigments, yellow pigments, purple pigments and black pigments that can be applied to the ink composition. As the red pigment, the white pigment, the green pigment, the blue pigment, the yellow pigment, the purple pigment and the black pigment of this embodiment, all known ones can be applied.

The ink composition of this embodiment may include 5 to 25% by weight, preferably 7 to 17% by weight, more preferably 10 to 15% by weight, based on the total weight of the ink composition. If the pigment is included in less than 5% by weight based on the total weight of the ink composition, there may be a problem that the color development ability is lowered, and when the pigment is included in excess of 25% by weight based on the total weight of the ink composition, the pigment It may not be evenly dispersed in the polyurethane resin and the mixed solvent may have a problem that the color development power is lowered and the printing surface is not smooth.

The ink composition of this embodiment may further comprise a sapwood sap.

Yellow Chilli ( Dendropanax) 　 morbifera ) is an evergreen broad-leaved arboreous tree belonging to the arboraceae family, which is native to Wando, Haenam, and Jeju Island. As the scientific name implies, Hwangchil-tree means Dendro omnipotent (pannax), and the main ingredient of Hwangchil-liquor is essential oil, and sap is used as a paint, and resin is known to have a great effect of vampire and vigor. have. Hwangchil's bark of the tree, when the wound comes out of the latex, the latex is yellow and named after. The first scientific research on the Hwangchil-tree was a study on the essential oil component of Hwangchil in 1937. Hwangchil is a kind of essential oil. The main component is bicyclic sesquiterpene with two double bonds. It is reported that it contains a component of.

As the ink composition of the present embodiment includes the sapwood sap, the adhesive force can be improved while achieving an appropriate drying speed and viscosity as the printing ink.

In addition, the sap of sapling of the present embodiment means sap itself obtained from the sap of sapling, and may mean a mixture of the sap purified, extract or solvent. In this case, the mixture may be a mixture of sulfur sap and 90% ethanol in a weight ratio of 1: 1, but is not limited thereto.

The ink composition according to the present embodiment may include 0.001 to 0.05% by weight of the sap of sapling, based on the total weight of the ink composition, preferably 0.003 to 0.03% by weight, and more preferably 0.005 to 0.02% by weight. have. If, based on the total weight of the ink composition, when the sap of sapling wood is included in less than 0.001% by weight may have a slight problem as described above. On the other hand, when the sap of sap lacquer tree on the basis of the total weight of the ink composition in excess of 0.05% by weight, the viscosity of the ink composition is high and yellowish color may not only have a low usability but also economical problems. In addition, there may be a problem that the formulation of the ink composition is unstable due to the separation of the yellow lacquer sap.

The ink composition of the present embodiment may further include at least one additive selected from the group consisting of a dispersant, an antifoaming agent, a light stabilizer, a binder, a pH adjusting agent and a drying rate adjusting agent in addition to the polyurethane resin, the mixed solvent and the pigment. Light stabilizers, binders, pH adjusting agents and drying rate adjusting agents can be applied without limitation to all known ones that can be applied to the ink.

The ink composition of the present embodiment can be applied without any limitation to known printing methods such as gravure printing, flexographic printing, screen printing, offset printing, inkjet printing, and preferably for gravure printing and flexographic printing.

In particular, in general, the ink applied to gravure printing has a viscosity of 0.5 to 2 P (poise), and the ink applied to flexographic printing has a viscosity of 1 to 5 P (poise). According to the viscosity of the ink composition is 100 ~ 200 cP, may be suitable for gravure and / or flexo printing.

The ink composition of the present embodiment can be applied on all printable substrates such as fibers, films, paper, wooden boards, labels, wallpaper, envelopes, paper, etc., and preferably can be applied on soft-packaging substrates (materials). As such, the wrapping paper to which the ink composition of the present embodiment is applied may be as shown in FIG. 1, but is not limited thereto.

Hereinafter, the alcohol-based printing ink composition of the present invention will be described in detail with reference to Examples, Comparative Examples, and Experimental Examples. Since these examples are only for illustrating the present invention, the scope of the present invention is not to be construed as being limited by these examples.

Example

Example  1 to 6

An ink composition was prepared comprising 30 g of a polyurethane resin (molecular weight 45,000), 55 g of a mixed solvent of the composition (weight ratio) shown in Table 1 below, and 15 g of a pigment (RED 57: 1 from Samyang Chemical Co., Ltd., YELLOW 14 from Orion). .

One 2 3 4 5 6 Acetic acid 2 2 3 2 - - Propyl acetate 2 One - - 3 2 Ethanol (90%) One One One One One One

Example  7

An ink composition was prepared comprising 30 g of a polyurethane resin (molecular weight 45,000), 55 g of a mixed solvent of Example 2, 13.993 g of a pigment (RED 57: 1 of Samyang Chemical Co., Ltd., YELLOW 14 of Orion), and 0.007 g of Hwangchil sap. .

Comparative example

Comparative example  One

An ink composition was prepared in the same manner as in Example 2, using a solvent in which benzene, toluene, and xylene were mixed in place of the mixed solvent.

Comparative example  2

As in Example 2, an ink composition was prepared using ethyl acetate as a solvent instead of a mixed solvent.

Comparative example  3 to 8

An ink composition was prepared in the same manner as in Example 2, except that a mixed solvent mixed with the composition ratio of Table 2 was used.

3 4 5 6 7 8 Acetic acid 3 0.5 4 0.5 - - Propyl acetate 3 0.5 - - 4 0.5 Ethanol (95%) One One One One One One

Comparative example  9 to 12

Using the same mixed solvent as in Example 2, to prepare an ink composition in the composition ratio of Table 3.

9 10 11 12 Polyurethane resin 15 65 60 20 Mixed solvent
(Composition ratio of Example 2) 70 30 15 75 Pigment 15 5 25 5

Comparative example  13

An ink composition was prepared in the same manner as in Example 2 except that the polymerization degree of the polyurethane resin was 30,000.

Comparative example  14

An ink composition was prepared in the same manner as in Example 2 except that the polymerization degree of the polyurethane resin was 65,000.

Comparative example  15

An ink composition was prepared in the same manner as in Example 2 except that the concentration of ethanol was 70%.

Comparative example  16

It was prepared in the same manner as in Example 7, except that the purified lacquer was used instead of the sap of sapling.

Comparative example  17

It was prepared in the same manner as in Example 7, except that purified gum rosin was used instead of the sap of sapling.

Experimental Example

Experimental Example  1: drying rate measurement

The drying rate of the ink compositions of Examples and Comparative Examples was measured and shown in Table 4 below.

After the gravure printing of the ink composition according to the above Examples and Comparative Examples under the conditions of the temperature of 150 ℃ or less, speed 100 m / s, pressure 20 ~ 40 kgf / cm ² on the soft packaging film, the ink was The degree of emergence was visually observed and evaluated by the 1-5 point method. At this time, the closer to five points, the faster the drying speed.

Drying rate evaluation Drying rate evaluation Example 1 4.0 Comparative Example 6 3.2 Example 2 4.2 Comparative Example 7 3.1 Example 3 3.9 Comparative Example 8 3.3 Example 4 4.0 Comparative Example 9 4.8 Example 5 3.8 Comparative Example 10 1.8 Example 6 4.0 Comparative Example 11 0.5 Example 7 4.2 Comparative Example 12 4.9 Comparative Example 1 4.3 Comparative Example 13 3.5 Comparative Example 2 4.4 Comparative Example 14 2.8 Comparative Example 3 3.2 Comparative Example 15 3.5 Comparative Example 4 3.5 Comparative Example 16 3.5 Comparative Example 5 3.0 Comparative Example 17 3.4

Looking at Table 4, the drying rate of the ink composition (Examples 1 to 6) according to this embodiment is almost similar to Comparative Example 1 using benzene, toluene and xylene and Comparative Example 2 using ethyl acetate, According to this embodiment, it can be seen that similar drying speeds can be achieved without using benzene, toluene, xylene, and ethyl acetate.

In addition, when comparing Examples 1 to 6 and Comparative Examples 3 to 8, acetic acid, propyl acetate and ethanol are mixed and used, but the mixed solvent is (a) acetic acid, propyl acetate and ethanol 2 to 1: 2 to 1: When included in the weight ratio of 1, (b) when acetic acid and ethanol is included in the weight ratio of 3 to 1: 1, (c) propyl acetate and ethanol is included in the weight ratio of 3 to 1: 1 is selected from In this case, it can be seen that a similar drying speed can be achieved.

Experimental Example  2: adhesion evaluation

The ink layer was formed by applying the ink compositions of Examples and Comparative Examples on the soft-packaging film in the same manner as in Experimental Example 1, and then applied to the ASTM D 2259 standard to evaluate the adhesive strength, which was repeated three times. The average value of the result (not shown to one decimal place or less) is shown in Table 5 below.

The ASTM D 2259 standard specifies the degree of the ink layer (cured ink composition) separated from the substrate (film) when the adhesive tape is attached to the substrate (film), pressed with the same force, and then the adhesive tape is peeled off gradually. We grasped and divided into 1B-5B and evaluate. At this time, 5B is the separated ink layer 0% (best), 4B is the separated ink layer 5% or less, 3B is the separated ink layer 5-15%, 2B is the separated ink layer 15-35%, 1B is separated 35 to 65% of the ink layer, 0B means at least 65% (the worst) of the separated ink layer.

Adhesion status Adhesion status Example 1 3.3 B Comparative Example 6 2.0 B Example 2 3.7 B Comparative Example 7 2.3 B Example 3 3.3 B Comparative Example 8 2.0 B Example 4 3.7 B Comparative Example 9 0.7 B Example 5 3.3 B Comparative Example 10 - Example 6 3.7 B Comparative Example 11 - Example 7 4.3 B Comparative Example 12 1.3 B Comparative Example 1 3.7 B Comparative Example 13 3.3 B Comparative Example 2 3.7 B Comparative Example 14 2.3 B Comparative Example 3 2.3 B Comparative Example 15 3.0 B Comparative Example 4 2.0 B Comparative Example 16 3.0 B Comparative Example 5 2.3 B Comparative Example 17 3.3 B

Looking at Table 5, it can be seen that the adhesion state of the Example is superior to the comparative example.

In particular, when comparing Examples 1 to 6 and Comparative Examples 3 to 8, acetic acid, propyl acetate and ethanol are mixed and used, but the mixed solvent is (a) acetic acid, propyl acetate and ethanol 2 to 1: 2 to 1: When included in the weight ratio of 1, (b) when acetic acid and ethanol is included in the weight ratio of 3 to 1: 1, (c) propyl acetate and ethanol is included in the weight ratio of 3 to 1: 1 is selected from In this case, it can be seen that the adhesion is excellent. This means that the drying rate and viscosity of the ink composition vary depending on the composition ratio of the mixed solvent, which also affects the adhesive force.

In addition, when comparing Example 7 and Comparative Examples 16 to 17, it can be seen that among the substances obtained from the sap of the tree to trees, the adhesion improving effect of the sap of sapling wood is the best.

On the other hand, in Comparative Examples 10 and 11, in which the amount of polyurethane was excessively large compared to the mixed solvent, it was not uniformly applied by viscosity, and thus, it was difficult to form an ink layer (film), so that the evaluation of adhesive strength was difficult. In addition, in the case of Comparative Example 14 in which the degree of polymerization of the polyurethane was more than 60,000, the formation of the ink layer (film) was difficult, and thus the adhesive force was lowered.

Experimental Example  3: viscosity measurement

The ink compositions of the Examples and Comparative Examples were adjusted to room temperature (about 24 ° C.) and tested with an E-type viscometer (RE80) manufactured by Toki Industries, Ltd., and the results are shown in Table 6 below.

Viscosity (cP) Viscosity (cP) Example 1 141 Comparative Example 6 349 Example 2 145 Comparative Example 7 325 Example 3 136 Comparative Example 8 345 Example 4 141 Comparative Example 9 69 Example 5 131 Comparative Example 10 945 Example 6 142 Comparative Example 11 840 Example 7 150 Comparative Example 12 87 Comparative Example 1 151 Comparative Example 13 105 Comparative Example 2 148 Comparative Example 14 659 Comparative Example 3 301 Comparative Example 15 179 Comparative Example 4 308 Comparative Example 16 244 Comparative Example 5 341 Comparative Example 17 205

Looking at Table 6, it can be seen that the ink composition according to this embodiment has a viscosity of about 130 ~ 170 cP.

Experimental Example  4: print quality evaluation

The color development (pigment dispersibility) and scratch resistance of the ink compositions of the examples and comparative examples were evaluated.

The color development power is to mix the red and green pigments and print the flower shape as the pigments of the ink of the Examples and Comparative Examples, and then to evaluate the five-color method to 20 men and women each having the same visual acuity (0.8 ~ 1.0) The average values are shown in Table 7 below. The closer to 5 in the evaluation of color development, the better the color development, that is, the better the dispersibility of the pigment.

The scratch resistance was evaluated by applying a five-point method to the peeling of the ink of the printing paper when scraping in the transverse direction while applying a constant pressure to the printing paper after the evaluation of the color development power, the average value is shown in Table 7 below. The closer to five points in the scratch resistance evaluation, the less the extent of the peeled ink, that is, the better scratch resistance.

The printing conditions were the same as in Experimental Example 1.

Color development Scratch resistance Color development Scratch resistance Example 1 3.9 3.5 Comparative Example 6 2.8 2.7 Example 2 4.1 3.9 Comparative Example 7 2.9 2.9 Example 3 3.5 3.4 Comparative Example 8 2.9 2.6 Example 4 3.7 3.5 Comparative Example 9 2.5 1.8 Example 5 3.4 3.4 Comparative Example 10 1.5 3.5 Example 6 3.5 3.6 Comparative Example 11 0.8 1.1 Example 7 4.2 4.3 Comparative Example 12 1.4 2.5 Comparative Example 1 3.8 3.5 Comparative Example 13 3.1 2.9 Comparative Example 2 3.9 3.8 Comparative Example 14 1.8 3.8 Comparative Example 3 3.1 3.0 Comparative Example 15 3.4 3.5 Comparative Example 4 3.0 2.8 Comparative Example 16 2.5 4.0 Comparative Example 5 2.9 3.0 Comparative Example 17 3.0 2.9

Looking at the above Table 7, it can be confirmed that the color development and scratch resistance of the ink composition according to the present embodiment is remarkably excellent. In particular, in Comparative Example 11 in which the mixed solvent was a small amount, the pigment was not sufficiently dispersed, and in Comparative Example 12, the amount of the pigment was less than that in the mixed solvent, the color was not clear, and the color development power was lowered.

In addition, looking at Example 7 and Comparative Examples 16 to 17, it can be seen that Example 7 using the Hwangchil sap has excellent color resistance and at the same time excellent scratch resistance. On the other hand, when lacquer was used, the scratch resistance was excellent, but the dispersibility of the pigment was poor, and the color development was not good. When using gumrozin, the coloring power and the scratch resistance were deteriorated compared to the examples.

As described above, the description of the present invention is for the purpose of illustration, and those skilled in the art to which the present invention belongs may easily change to other specific forms without changing the technical spirit or essential features of the present invention. I can understand. Therefore, it is to be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. .

Claims (9)

Polyurethane resins;
Mixed solvents containing acetic acid, propyl acetate and ethanol in a weight ratio of 2 to 1: 2 to 1: 1;
Pigments; And
Alcohol-based printing ink composition comprising a;
The method of claim 1,
The ink composition is
20 to 60 wt% of the polyurethane resin, 20 to 70 wt% of the mixed solvent, 5 to 25 wt% of the pigment, and 0.001 to 0.05 wt% of the sapwood sap based on the total weight of the ink composition. Alcohol based printing ink composition.
delete delete delete The method of claim 1,
The polyurethane resin is an alcohol-based printing ink composition, characterized in that the polymerization degree of 40,000 ~ 60,000.
delete The method of claim 1,
Alcohol-based printing ink composition, characterized in that the viscosity of the ink composition is 100 ~ 200 cP.
The method of claim 1,
The ink composition is
Alcohol-based printing ink composition further comprises at least one additive selected from the group consisting of a dispersant, antifoaming agent, light stabilizer, binder, pH adjusting agent, drying rate adjusting agent.

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