KR20140090322A - Aqueous polymer ink composition - Google Patents

Abstract

More particularly, the present invention relates to an aqueous polymer ink composition comprising 5 to 40% by weight of a plasma aqueous dispersion solution, 5 to 70% by weight of distilled water, 5 to 30% by weight of a copolymerized polymer resin, 0.1 to 5% by weight of a surfactant, 0.1 To 2% by weight of a water-soluble polymer and 0.1 to 2% by weight of a defoamer.

Description

Aqueous polymer ink composition {AQUEOUS POLYMER INK COMPOSITION}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink composition for printing, and more particularly to an ink composition that can be printed on a general printed material such as art paper and film.

An ink-jet recording system is a system in which colored dyes or colored pigments dissolved or dispersed in a water-based or non-aqueous solvent are ejected as minute droplets independent of one or more nozzles, And images each droplet as an arbitrary character or image by electronic control on the medium.

As the recording medium of this recording system, it is possible to use ordinary paper such as paper used for electrostatic transfer system or paper used for writing, but in order to obtain a good recorded image, it is necessary that the recording medium has the following two performances Do. The first performance is that ink absorption is good, ink droplets adhered to the surface of the medium rapidly penetrate into the medium, and quickly become apparently dry, thereby preventing contamination due to contact with a recording medium or other media or hands , The second performance is that the ink droplet spreads more than necessary into the inside or the surface of the medium so that the dot recorded by the ink droplet is not excessively large or distorted in shape.

On the other hand, as a coloring component used in ink, direct dyes, acid dyes, basic dyes, reactive dyes, disperse dyes, various pigments and the like are used. In general, a water-soluble dye is most preferably used, and thus, in the case of ink-jet recording, there is a considerably large problem that a recorded image is insufficient in water resistance. For example, when a recorded matter on which an image is recorded in the inkjet recording system is posted outdoors, the dye becomes irregular due to rainwater and the recorded image becomes unreadable. Further, in a case where exposure is made for a long time under a high humidity environment, blurring is caused to remarkably lower the image quality.

Therefore, in order to water-resisting recorded images by ink jet recording, for example, Japanese Patent Laid-Open Publication No. 55-150396 discloses a method of forming a dye and a lake by printing using an aqueous dye ink, Has been proposed.

On the other hand, currently commercially available HP latex inks and Sepiax inks are manufactured using latex resins. The advantage of the latex is that it is excellent in adhesion, but it is difficult to apply it to various fields by applying heat at a high temperature during printing.

Globally, the solvent ink market is turning to eco-friendly water-based inks free of hazardous substances and harmful substances. In particular, offset, gravure, and screen printing techniques have been overcome with the introduction of large industrial printers that can print at high speeds without preprocessing.

The purpose of replacing solvent inks with water-based inks is that they are very non-environmentally friendly and harmful and have a cause of cancer, and water inks have been developed and replaced worldwide.

In particular, Europe is regulating imports of non-eco-friendly inks, so eco-friendly water-based inks are likely to be used.

This is because the operator in the internal space of the printing operation prefers the environmentally friendly water-based ink free from toxic gases or harmful carcinogens and wants an environment free of odor.

In addition, it is possible to prevent ink bleeding at the time of printing using the ink, and it is a problem that is required in developing the ink that the printed ink can be formed clearly and can be maintained for a long time.

Therefore, it is required to develop an ink composition capable of printing in various fields by keeping the environment friendly and free from harm to the human body, and printing can be performed without giving high heat at the time of printing.

It is an object of the present invention to provide an ink composition which can be printed in a non-high-temperature manner.

Another object of the present invention is to provide an ink composition capable of minimizing ink bleeding and reducing printing costs.

In order to achieve the above object, the present invention provides a method for producing a polymer electrolyte membrane, which comprises 5 to 40 wt% of a plasma aqueous dispersion solution, 5 to 70 wt% of distilled water, 5 to 30 wt% of a copolymerized polymer resin, 0.1 to 5 wt% of a surfactant, And 0.1 to 2% by weight of an antifoaming agent.

The present invention also provides an aqueous polymer ink composition, wherein the plasma aqueous dispersion solution is prepared by mixing a pigment, distilled water, and a dispersant in a low-pressure or vacuum state and performing a plasma process to form a nanomaterial.

The present invention also provides an aqueous polymer ink composition, wherein the copolymer polymer resin is selected from the group consisting of acrylic, polyurethane, carbonate-type polyurethane (APU) and polyethylene.

The present invention also provides an aqueous polymer ink composition characterized in that the pigment contained in the dispersion solution is coated at a low temperature or a normal temperature and a high pressure.

The present invention also provides an aqueous polymer ink composition, wherein the high-pressure state is 5000 to 50,000 psi.

The aqueous polymer ink composition according to the present invention may further contain nano-alumina or nano-silica or may be added with nano-alumina or nano-silica in an amount of 1 to 15% by weight based on the total ink composition. Lt; / RTI >

The present invention also provides an aqueous polymer ink composition comprising 0.5 to 10% by weight of polysiloxane as an adhesion promoter in relation to the total ink composition, which may further include an adhesion promoting agent.

Since the aqueous polymer ink composition according to the present invention is printed in a non-high-temperature manner, ink bleeding can be minimized, and it is also advantageous in outputting to general industrial materials such as art paper and film.

Since the aqueous polymer ink composition according to the present invention is printed in a non-penetrating manner, the cost for printing can be remarkably reduced.

The aqueous polymer ink composition according to the present invention has a new environmentally friendly aqueous pigment ink which can be naturally dried at a temperature as low as 50 캜 or lower.

The aqueous polymer ink composition according to the present invention is an environmentally friendly water-based ink prepared based on a nano-dispersed resin obtained by reacting with a nano-acrylic hybrid method and a polyurethane copolymerization reaction and a manufacturing technique obtained by recoating a nano- It has the effect of enabling high-speed output to various materials at 50 ℃ or less.

Hereinafter, the present invention will be described in detail. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as to avoid obscuring the subject matter of the present invention.

The terms " about ", " substantially ", etc. used to the extent that they are used herein are intended to be taken to mean an approximation of, or approximation to, the numerical values of manufacturing and material tolerances inherent in the meanings mentioned, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

The aqueous polymer ink composition according to the present invention comprises 5 to 40% by weight of a plasma aqueous dispersion solution, 5 to 70% by weight of distilled water, 5 to 30% by weight of a copolymerized polymer resin, 0.1 to 5% by weight of a surfactant, 0.1 to 2% And 0.1 to 2% by weight of an antifoaming agent.

A plasma aqueous dispersion solution synthesized by a plasma process can be reacted with a copolymerized polymer resin to produce a polymer ink.

The dispersion solution used in the ink composition of the present invention is subjected to a plasma process in order to obtain ink characteristics having chemical resistance and durability. In addition, when a plasma process is performed, there is an advantage that a precipitate does not occur after ink production. To this end, it is desirable to include a low temperature process in which a plasma is applied to the ink composition. In particular, the reactivity of other kinds of atoms and metastable atoms in the plasma is high.

The material used for the plasma aqueous dispersion solution may be subjected to a plasma process using a pigment, distilled water and a dispersant. It is preferable that the plasma process is carried out at a low temperature and in a vacuum state.

Examples of the pigments usable in the present invention are represented by color index numbers.

Examples of red coloring pigments for forming red filter segments include CI Pigment Red 7, 9, 14, 41, 48: 1, 48: 2, 48: 3, 48: 4, 81: 81, 3, 97, 122, 123, 146, 149, 168, 177, 178, 180, 184, 185, 187, 192, 200, 202, 208, 210, 215, 216, 217, 220, 223, 224, 226, 227, 228, 240, 246, 254, 255, 264 and 272 can be used, and yellow and orange pigments can be used in combination.

As the yellow color pigment for forming the yellow filter segment, for example, C.I. Pigment Yellow 1, 2, 3, 4, 5, 6, 10,12, 13,14,15,16,17,18,20,24,31,32,34,35,35: 1, 37, 37: 1, 40, 42, 43, 53, 55, 60, 61, 62, 63, 65, 73, 74, 77, 81, 83, 86, 93, 94, 95, 118, 119, 120, 123, 125, 126, 127, 128, 129, 137, 138, 139, 147, 148, 150, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 240, 171, 172, 173, 174, 175, 176, 177, 179, 182, 185, 187, 188, 193, 194, 199, and the like can be used.

The orange pigments include, for example, C.I. Orange pigments such as Pigment orange 36, 43, 51, 55, 59 and 61 may be used.

As the green pigment, for example, C.I. Green pigments such as Pigment Green 7, 10, 36 and 37 can be used.

As the blue pigment, for example, C.I. Blue pigments such as Pigment Blue 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 22, 60 and 64 can be used. Blue pigments include C.I. Purple pigments such as Pigment Violet 1, 19, 23, 27, 29, 30, 32, 37, 40, 42, and 50 can be used in combination.

As the magenta pigment, for example, C.I. Pigment Violet 1, 19, CI Pigment Red 144, 146, 177, 169, 81, and the like. The magenta pigment may be used in combination with a yellow pigment.

Black pigments such as carbon black having a particle diameter of 200 nm or less can also be used.

The particles of the pigment in the ink composition have a size of about 50 to 500 nm, more preferably 100 nm or less. When the pigment particle size is 500 nm or more, the flowability may decrease and the jetting may be uneven. When the pigment particle size is 50 nm or less, it may be difficult to secure the dispersion stability of the pigment.

The dispersing agent is preferably selected from a polyester type, a polyurethane type, a polyacryl type, and the like. The addition of a dispersant to the aqueous plasma dispersion solution has the advantage of ensuring dispersion stability and storage stability.

The mixing ratio of the pigment, the distilled water and the dispersing agent in the plasma aqueous dispersion solution is preferably 1: 9: 0.01 to 3: 8: 3 by weight. When mixed in the above ratio, the dispersion can be appropriately made.

In addition, the plasma process can further reduce the pigment in the dispersion solution and evaporate the volatile molecules so that the pigment is formed into a nanomaterial. The plasma process of the present invention also causes coalescence and sintering of the pigment particles.

The surface energy of the nanoparticles formed by the plasma process is very high, resulting in a high thermodynamic potential that drives the particles to a low surface energy state. The particles can lower the surface energy by bonding with adjacent particles. This reaction generally occurs early on by the diffusion of surface atoms that form a neck region between the particles.

Since the surface energy of the nanoparticles is generally very high, this can be sintered at low temperatures as a major thermodynamic driving mechanism for sintering the nanoparticles. Observation of the decrease in resistance of the ink and sintering of the nanoparticles can be observed by conversion of the powder to ductility. Good ductility implies that the particles are mechanically connected and thus sintered.

Limited sintering between micro sized particles is observed as evidence of increased conductivity and ductility. In this case, the sintering tends to be limited to only a very small amount in the vicinity of the contact point of the particle-particle. These contact points have a surface energy gradient, which results in sintering by neck formation between particles, which drastically reduces total surface energy.

As the particles are fused by neck formation, the total surface energy is reduced and the thermodynamic potential driving the process is reduced. The sintering drive continues to be densified, and generally additional energy must be supplied. The additional energy may be supplied by heating in the oven or by laser heating, or may be supplied by the plasma itself, since the plasma tends to be substantially heated at high gas pressures. The plasma process can transfer heat through the impingement reaction, and the additional heat may also be supplied by application of current causing ohmic heating, which further promotes hot sintering at the grain junction.

In addition, the current can be supplied in a variety of ways, but it is most convenient to be supplied by an induced magnetic field already present in the apparatus used to generate the plasma. In order to complete the sintering or densification of the particles, they must be heated to a temperature sufficiently higher than 100 ° C, but the sintering of the particles by the plasma itself is generally sufficient to produce a highly ductile material. The larger the particles, the more heating may be required to completely sinter the particles.

The plasma aqueous dispersion solution prepared by the plasma process may be reacted with a copolymerized polymer resin to produce a polymer ink. That is, the copolymer polymer resin of the present invention plays a role in causing a coating on the pigment present in the dispersion solution.

A copolymeric polymer resin acts to coat the pigment in the nano form in the plasma aqueous dispersion solution produced by the plasma process.

The copolymer resin is preferably at least one selected from the group consisting of acryl, polyurethane, carbonate-type polyurethane (APU) and polyethylene.

The copolymer polymer resin may include 5 to 30% by weight of the total ink composition. Within this range, the copolymeric polymer resin reacts with the aqueous plasma dispersion solution and is well coated with the pigment in the dispersion solution.

The ink composition may be formed at a temperature ranging from 0 to 25 ° C, and may be coated on the pigment contained in the dispersion solution at a high pressure. More specifically, the high pressure state may be maintained while maintaining a high pressure of 5000 to 50000 psi.

Meanwhile, the aqueous polymer ink composition according to the present invention may be mixed with a surfactant, a crosslinking agent, and an antifoaming agent. It is preferable that the ink composition contains 0.1 to 5% by weight of a surfactant, 0.1 to 2% by weight of a crosslinking agent, and 0.1 to 2% by weight of an antifoaming agent.

Examples of the surfactant include ethanol, ethylene glycol, acetone, methyl ethyl ketone, and isobutanol.

As the crosslinking agent, for example, 4,4-diphenylmethane, disocyanate, epoxy silane and the like can be used.

As the defoaming agent, for example, a mineral oil defoaming agent or a silicone defoaming agent may be used.

The aqueous polymer ink composition may further include a glycol-based solvent. As the glycol-based solvent, polyethylene glycol is preferably used. The solvent is preferably added in an amount of 1 to 20% by weight based on the ink composition, and the solvent is added in an amount of 1 to 20% by weight relative to the ink composition to prevent the pigment from aggregating or hardening even when stored for a long period of time. can do.

In addition, although the water-based polymer ink according to the present invention is also important in adhesion, it should be excellent in gloss retention, durability, light resistance, and chemical resistance of ink, and should be advantageous in preventing haziness (fogging phenomenon). For this purpose, nanosilica particles or nano-alumina useful for scratch resistance can be suitably compounded and promoted.

That is, in order to improve the chemical resistance of the ink composition, nano-alumina or nano-silica can be added, or nano-alumina and nano-silica can be added. The addition of the above-mentioned nano-alumina and / or nano-silica results in an effect that the gloss of the ink itself is not lowered.

Particularly, it is advantageous to maintain ink storage stability by reacting nano-alumina particles and nanosilica with a refractive index of about 1.5, which are different in refractive index (alumina refractive index 1.72, silica refractive index 1.55).

When the nano-alumina and the nano-silica are added, the mixture is preferably added at a weight ratio of about 7: 3, and may be added in a proportion of 1 to 15% by weight based on the total ink composition.

In addition, the present invention may further include an adhesion promoter, which may comprise 0.5 to 10% by weight of polysiloxane as an adhesion promoter relative to the total ink composition.

By coating the particles contained in the ink composition, the polysiloxane acts as an adhesion promoter and can be re-coated with the particles contained in the ink composition to promote adhesion.

The polysiloxane serves as an adhesion promoter and re-coating the particles contained in the ink composition.

The ink made of the ink composition according to the present invention is printed in a non-penetrating manner when printing on a printing paper such as paper. Accordingly

Further, the aqueous polymer ink according to the present invention has the effect of providing a new environmentally friendly water-based pigment ink which can be naturally dried even at a temperature as low as 50 캜 or lower.

The aqueous polymer ink is an eco-friendly aqueous direct ink based on a nano-dispersed solution reacted with a nano-acrylic hybrid method and a polyurethane copolymerization, and a manufacturing technique obtained by recoating a nano-concentrate solution with a plasma coating. Speed output to various materials.

Hereinafter, embodiments of the present invention will be described in detail.

Example  One

plasma  Preparation of dispersion solution

In a vacuum state, a magenta pigment, distilled water and a dispersing agent were mixed and subjected to a plasma process. The plasma process is performed in a vacuum state, and the mixing continues until the process is completed. The mixing ratio of the pigment, the distilled water and the jetting agent was set to a weight ratio of 1: 9: 0.5.

Mercury Polymer  Ink manufacture

Polyurethane was used as the copolymerized polymer resin in the prepared plasma dispersion solution. 30% by weight of plasma aqueous dispersion solution, 31% by weight of distilled water, 30% by weight of copolymerized polymer resin, 5% by weight of surfactant, 2% by weight of cross- By weight based on the total weight of the ink.

25 ° C, and the high-pressure state was maintained at a high pressure of 50000 psi to prepare an ink.

Example  2

The procedure of Example 1 was repeated except that polyethylene glycol was added as a solvent and 10 wt% of the ink composition was added to prepare an ink.

Example  3

The procedure of Example 2 was repeated except that 10 wt% of nano-alumina and nano silica were added to the ink composition and added to the ink composition to prepare an ink.

Example  4

The same procedure as in Example 1 was carried out except that a polysiloxane was added to the ink composition, and 5 wt% of polysiloxane was added to the ink composition to prepare an ink.

Comparative Example  One

3% by weight of a magenta pigment, 15% by weight of a solid latex polymer and 82% by weight of distilled water, to prepare a latex ink composition.

Comparative Example  2

The crosslinking agent and the defoaming agent were mixed in the amounts of 3% by weight of a magenta pigment, 15% by weight of a solid latex polymer, 5% by weight of a surfactant, 2% by weight of a crosslinking agent, 2% Were used.

Comparative Example  3

5 wt% of a magenta pigment, 2 wt% of a dispersing agent, 30 wt% of a copolymer resin made of polyurethane, 1 wt% of a surfactant, 2 wt% of a crosslinking agent, 1 wt% of a defoaming agent and 59 wt% After mixing, an ink composition was prepared.

Experimental Method

1. Water resistance evaluation

Printing was carried out at a relatively low printing temperature of 50 DEG C at the time of printing at the time of printing on plain paper for water resistance evaluation using the inks of the examples and the comparative examples.

After printing, the film was immersed in distilled water for 1 minute, taken out and dried, and optical density (OD) was measured. The result was evaluated according to the following criteria. The results are shown in Table 1 below.

◎: OD value changed less than 15% from initial value (very good)

○: OD value changed from 15% to less than 30% (good)

×: OD value changed more than 30% from the initial value (not satisfactory)

2. Evaluation of ink storage stability

In order to evaluate the ink storage stability, 100 ml of each ink composition obtained in Examples and Comparative Examples was sealed in a heat-resistant glass bottle, which was then sealed for 2 months at a constant temperature of 30 DEG C, The results are shown in Table 1 below.

division Water resistance evaluation Ink storage stability Example 1 ◎ No sediment Example 2 ○ No sediment Example 3 ◎ No sediment Example 4 ◎ No sediment Comparative Example 1 × No sediment Comparative Example 2 × No sediment Comparative Example 3 × In sediment

As a result of the test, the water resistance evaluation of the embodiments is good or very good, but the results of the comparative examples are not satisfactory. It can be seen that the printing is satisfactorily performed even at a printing temperature of 50 캜 which is relatively low.

On the other hand, in the case of general latex inks (Comparative Example 1 and Comparative Example 2), it is presumed that printing should be performed at a high temperature of about 90 ° C or higher without satisfactory printing even at a relatively low printing temperature of 50 ° C.

In addition, the ink storage stability of the examples of the present invention can be seen from Comparative Example 3 that there is an advantage that a precipitate does not occur when an ink composition is prepared after preparation of a plasma aqueous dispersion solution.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be obvious to the person.

Claims (7)

Wherein the aqueous dispersion comprises 5 to 40% by weight of a plasma aqueous dispersion solution, 5 to 70% by weight of distilled water, 5 to 30% by weight of a copolymerized polymer resin, 0.1 to 5% by weight of a surfactant, 0.1 to 2% by weight of a crosslinking agent, By weight based on the total weight of the composition. The method according to claim 1,
The plasma aqueous dispersion solution is formed by mixing a pigment, distilled water, and a dispersant in a low-pressure or vacuum state and performing a plasma process to form a nanomaterial,
Wherein the ratio of the pigment: distilled water: dispersant is in a weight ratio of 1: 9: 0.01 to 3: 8: 3. The method according to claim 1,
Wherein the copolymer polymer resin is selected from the group consisting of acrylic, polyurethane, carbonate-type polyurethane (APU) and polyethylene. The method according to claim 1,
Wherein the pigment contained in the dispersion solution is coated at 0 to 25 占 폚 and at a high pressure, and the high pressure state is 5000 to 50000 psi. The method according to claim 1,
The aqueous polymer ink composition may further comprise a glycol-based solvent,
Wherein the solvent is added in a proportion of 1 to 20% by weight based on the ink composition. The method according to claim 1,
The aqueous polymer ink composition may additionally include nano-alumina or nanosilica, or a mixture of nano-alumina and nanosilica,
Is added at a ratio of 1 to 15% by weight relative to the ink composition. The method according to claim 1,
Wherein an adhesion promoter is added to the aqueous ink composition, wherein 0.5 to 10% by weight of the polysiloxane is added as an adhesion promoter to the ink composition.