KR100726804B1 - A water-based dye sublimation ink jet ink for textile printing with environmental property - Google Patents

Abstract

Provided is an aqueous transfer ink for eco-friendly ink jet printing, which emits no harmful organic chemical compounds including acetonitrile, dimethyl sulfate, dimethanol amine formaldehyde or urea during a transfer process. The aqueous transfer ink for eco-friendly ink jet printing comprises: at least one dispersion pigment; an acrylic polymer dispersant; ultrapure water; a KOH pH buffering solution; a thickener formed of a mixed ethylene glycol solution containing at least one compound selected from ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol and polyethylene glycol, and ultrapure water; and a moisturizing agent formed of a mixed diol solution containing at least one selected from glycerin, butanediol, propanediol and hexanediol, and ultrapure water, NMP and 2-pyrrolidone. The aqueous transfer ink emits no harmful chemicals during a transfer process performed at 180-200 deg.C.

Description

Water-based Dye Sublimation Ink Jet Ink For Textile Printing with Environmental Property}

1 schematically illustrates a process for producing an ink composition according to the present invention.

TECHNICAL FIELD The present invention relates to an aqueous transfer ink composition for inkjet printing and a method for producing the same, and more particularly, to an aqueous transfer ink composition and a method for producing the same, which do not contain chemicals harmful to a human body.

With the development of printing technology using inkjet, ink compositions for the application of various types of fiber printing have been prepared. In general, the inkjet printing method can be largely classified into a direct printing method and a thermal transfer printing method by transfer to paper and a thermal transfer system. The direct printing method has the advantage that an additional process of printing on paper is not required because the image is printed directly from the inkjet printer machine to the textile. However, after printing, a facility for washing and fixing processes is required, and waste water is generated in such a process. In contrast, in the case of textile printing using a sublimation transfer system, an additional process for washing and fixing is not required, so that the process equipment is simplified and waste water does not occur. In practice, however, even in the case of a sublimation transcription system, it is difficult to completely prevent the generation of harmful chemicals. Hazardous Substances in Sublimation Transcription Systems The US Food and Drug Agency (FDA) found sulfonated lignin, formaldehyde, N, N-dimethylformamide and dimethyl sulfoxide. ), Hydrazine and morpholine are defined as hazardous or toxic substances. And EPA (Environmental Protection Agency) includes acetonitrile, dimethyl sulfate, dimethylolamine, ethanolamine, N, N-dimethylformamide, formaldehyde, hydrazine, Methyl ethyl ketone and triethylamine are defined as representative hazardous organic solvents. The International Chemical Safety Card also includes Acetonitrile, Dimethyl Sulfate, Dimethyl Sulfoxide (DMSO), Ethanolamine, N, N-Dimethylform Dimethylformamide, formaldehyde, hydrazine, morpholine (Morpholine), methyl ethyl ketone, sodium hydroxide (NaOH), tetrahydrofuran (THF) and urea as hazardous chemicals Doing. In addition, the Korea National Institute of Environmental Science defines methyl ethyl ketone, trimethylamine, ethyl acetate, hydrazine, sodium hydroxide, dimethyl sulfate and formaldehyde as hazardous substances.

Prior art related to printing inks discloses Patent Publication No. 10-2004-0045158. The prior art presented discloses a process for producing a water soluble printing ink which is heated to 90 to 110 ° C. using dimethyl sulfoxide as an organic solvent, dissolved or diluted for at least 3 hours and then cooled. And another prior art associated with inkjet textile printing ink compositions is Patent Publication No. 2003-0074369. The preceding invention presented discloses an inkjet textile printing ink composition comprising a container solvent having at least one reactive dye, water and at least one alcohol group. The ink compositions of the preceding invention presented include acetic acid, sodium acetate, phosphoric acid, sodium phosphate, boric acid, sodium borate, sodium tetraborate and sodium citrate. Another prior art is AU20051869B2. The prior art presented discloses a transfer method using an inkjet printer, and the ink composition used comprises NaOH or DMSO, which is harmful to the human body.

Known inkjet printing compositions are prepared using dimethyl sulfoxide, sodium acetate or other harmful organic solvents. In the case of known ink printing compositions, the use of such harmful organic solvents is for the improvement of the output quality of the ink in the inkjet printing process. Specifically, organic solvents containing these harmful chemicals have been used to make emulsion forms with high dispersibility and high stability in the form of pigment particles. However, the use of such harmful solvents not only have a detrimental effect on the worker in the work process, but also can cause harmful waste water problems due to by-products of the process. The present invention proposes an inkjet printing composition in which such harmful chemicals are not used.

It is an object of the present invention to provide an inkjet printing ink composition which does not discharge harmful substances in the sublimation transfer process of the printing process and a method for producing such an ink composition.

According to a suitable embodiment of the present invention, a method of producing an aqueous transfer ink for inkjet printing comprises the steps of selecting at least one disperse dye among red, blue and yellow; 15 to 30% by weight acrylic polymer dispersant; 15 to 35 weight percent of sublimable disperse dyes; And preparing a dye dispersion solution of 50 to 70% by weight of ultra pure water; Preparing a stock composition of an ink composition in which a bead of 0.2 to 0.5 mm is placed in a milling machine so that the average particle size of the disperse dye is 80 to 170 nm; Adding a reactive chemical to adjust the viscosity, surface tension and viscosity to prepare the ink composition; And filtering the prepared ink composition with a member, and the prepared transfer ink includes a lignin-based dispersant such as sulfonic greenin, acetonitrile, dimethyl sulfate, and dimethanol during a transfer process at 180 to 200 ° C. It does not release amines, N, N-dimethylformamide, formaldehyde, hydrazine, methyl ethyl ketone, triethylamine, dimethyl sulfoxide, morpholine, sodium hydroxide, tetrahydrofuran or urea.

According to another suitable embodiment of the present invention, preparing the dye dispersion solution includes adding an acrylic polymer dispersant to ultra pure water.

According to another suitable embodiment of the present invention, an aqueous transfer ink for inkjet printing comprises a dispersion stock solution comprising at least one dispersion dye of red, blue and yellow, and an acrylic polymer dispersant; Ultra pure water; Potassium hydroxide pH buffer solution; Thickeners made of a mixed ethylene glycol solution obtained by mixing any one selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol and polyethylene glycol or a mixture of 3 to 5 thereof with ultra pure water; Moisturizer prepared from a mixed diol solution obtained by mixing any one or a mixture thereof selected from the group consisting of glycerin, butanediol, propanediol and hexadiol with ultra pure water, normal methylpyrrolidone (NMP) and 2-pyrrolidone Lignin-based dispersants such as sulfonic lignin, acetonitrile, dimethyl sulfate, dimethanolamine, N, N-dimethylformamide, formaldehyde, hydrazine, methyl ethyl ketone, tri It does not emit ethylamine, dimethyl sulfoxide, morpholine, sodium hydroxide, tetrahydrofuran or urea.

According to another suitable embodiment of the present invention, the dispersion stock solution is 13 to 19 wt%; Ultra pure water is 45 to 55 wt%; pH buffer solution is 0.1 to 0.4 wt%; Thickeners 25 to 35 wt%; The surfactant is 0.2 to 0.8 wt%; Antifoaming agent from 0.2 to 0.8 wt%; And the moisturizing agent is 0.5 to 8 wt%.

According to another suitable embodiment of the present invention, the surface tension is 33 to 36 dyne / cm; Viscosity is 2.0-4.0 cP; And pH 7 to 10.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings. The examples presented are exemplary and are not intended to limit the scope of the invention.

The ink composition according to the present invention is prepared by using chemicals that are not harmful to the human body and by increasing the purity of dyes and raw materials. Thus, the ink composition according to the present invention prepared using the chemical to discharge substances that are not harmful to the human body and the environment during the sublimation process at 180 to 200 ℃ and thereby protect the worker and also to protect the environment do.

1 schematically illustrates a process for producing an ink composition according to the present invention.

Referring to Figure 1, the manufacturing process of the ink composition according to the present invention comprises the step of selecting a disperse dye (S11); Preparing a polymer dispersant solution (S12); Milling step S13; Stirring step (S14); And it may include a filtering step (S15).

1. Disperse Dye Selection Step

In order to proceed the printing process on textiles through sublimation transfer, the ink composition should be prepared with a dispersible disperse dye. As the disperse dye, dyes having three primary colors of blue, red and yellow may be used.

Disperse dyes according to the present invention may include the following for each color.

blue

C.I. Disperse Blue 14; C.I. Disperse Blue 19; C.I. Disperse Blue 56; C.I. Disperse Blue 60; C.I. Disperse Blue 72; C.I. Disperse Blue 79; C.I. Disperse Blue 87; C.I. Disperse Blue 134; C.I. Disperse Blue 148; C.I. Disperse Blue 165; C.I. Disperse Blue 180; C.I. Disperse Blue 183; C.I. Disperse Blue 326; C.I. Disperse Blue 354; C.I. Disperse Blue 359

Red

C.I. Disperse Red 54; C.I.Disperse Red 60; C.I. Disperse Red 86; C.I. Disperse Red 91; C.I. Disperse Red 92; C.I. Disperse Red 343; C.I. Disperse Red 356

yellow

C.I. Disperse Yellow 5; C.I. Disperse Yellow 42; C.I. Disperse Yellow 54; C.I. Disperse Yellow 64; C.I. Disperse Yellow 79; C.I. Disperse Yellow 82; C.I. Disperse Yellow 93; C.I. Disperse Yellow 119; C.I. Disperse 160

Among the disperse dyes as described above, disperse dyes which are not allergic and carcinogenic may be selected, as set forth in the provisions of the European Oeko-Tex Standard 100. Specifically, blue is C.I. Disperse Blue 56, C.I. Disperse Blue 60, C.I. Disperse Blue 72, and C.I. Disperse Blue 359; Red is C.I. Disperse Red 54, C.I. Disperse Red 60, and C.I. Disperse Red 86; And yellow is C.I. Disperse Yellow 42, C.I. Disperse Yellow 54, C.I. Disperse Yellow 82, and C.I. It may be any one selected from the group consisting of Disperse Yellow 119.

2. Polymer Dispersant  Preparation of the solution

Disperse dyes must first be dispersed to produce a size that can be ejected through the inkjet nozzles. Ultraionized water is used as a dispersing solvent for dispersing the disperse dye. In order to prepare an ink free of impurities or iron components, an acrylic polymer dispersant having a molecular weight of 1600, an acid number of 200, and a density of 1.07 g / cm 3 is added and sufficiently stirred to prepare a polymer propellant solution. The sublimable disperse dye shown above is added to the prepared polymer dispersant solution so that wetting and dispersing are carried out with sufficient stirring. As a result 15-30% by weight of acrylic polymer dispersant; 15 to 35 weight percent of sublimable disperse dyes; And dye dispersion solution of 50 to 70% by weight of ultrapure water.

3. milling  fair( Milling Process )

The particle size of the disperse dye dispersed in the dye dispersion solution is in micro units, which is not suitable for ejection and dispersion through the inkjet nozzle. Therefore, the milling process must be milled to a size suitable for dispersion through the inkjet nozzles. For milling, a bead of 0.2-0.5 mm is placed in the milling machine and milled so that the average particle size of the dispersed dye is 80-170 nm. Through such a milling process, an ink composition stock solution excellent in dispersibility is produced. Milling is carried out at 80 to 90% of the total volume of the milling machine chamber and the injected beads are rotated at a speed of 1000 to 3000 RPM. For this milling operation, a machine having a structure of high-speed milling using beads such as NETZSCH's Labstar, which is commercially available, is used.

4. Stirring  fair

Reactive chemicals are added to the prepared ink composition stock solution. Generally, reactive chemicals are added to improve the stability, dispersibility, or adhesion of the ink composition. The reactive chemicals to be added should take into account the improvement of ink properties such as surface tension, viscosity, pH and storage stability and at the same time be harmless to humans and the environment. Such reactive chemicals include, for example, potassium hydroxide pH buffer solutions; Thickeners such as polyethylene glycol, ethylene glycol or diethyl glycol; And it may include a surface tension modifier that is a surfactant. Antifoaming agents such as sulfinol 104, sulfinol 420, sulfinol 440, sulfinol 485; And humectants, such as glycerin, butanediol or propanediol. Such reactive chemicals are added to the ink composition stock solution and stirred for 2 to 3 hours to prepare the ink composition. According to the present invention, the surface active agent that is a surface tension modifier is alpha olefin sulfonate (alpha-olefin-sulfonate), sodium hydroxy dodecane sulfonate, sodium n-dodecane sulfonate, alkyl sulfonic acid salt, sodium 2-dode Cansulfonate, succinic ester sulfonic acid salt, sodium dioctyl sulfosuccinate. Reactive chemicals can be mixed, for example, in the following amounts relative to 13-19 wt% of the dispersion stock and 45-55 wt% of ultrapure water.

0.1 to 0.4 wt% pH buffer solution

25 to 35 wt% thickener

0.2 to 0.8 wt% surface tension modifier

0.2 to 0.8 wt% antifoam; And

0.5 to 8 wt% moisturizer

The ink composition stock solution and the reactive chemicals are agitated in a mechanical stirrer, for example a commercially available Co., Ltd. PLHP 300 HS can be used.

5. Filter

The prepared ink composition is a process for removing impurities generated or mixed in the manufacturing process and filtering out particles having a predetermined size or more. The filtering process is carried out by a housing, a suction and a millipore, and through such a filtering process the ink composition has an overall uniform particle size.

Embodiments are provided below which do not limit the scope of the invention.

Example 1

A polymer dispersant was prepared by mixing 240 g of acrylic polymer dispersant with 500 g of ultra pure water. And C.I. 260 g of Disperse Blue 60 was added thereto, sufficiently stirred, and placed in a bead mill for about 5 hours to prepare a blue dispersion stock solution having an average particle of 135 nm. An ink composition according to the present invention was prepared by adding the following reactive chemicals to the prepared blue dispersion stock solution.

Blue dispersion stock 16 wt%;

Ultra pure water 51.8 wt%;

Diethyl glycol 30 wt%;

Butanediol 1wt%;

Sodium hydroxy dodecanesulfonate 0.5 wt%;

Sulfinol-465 0.5 wt%; And

Potassium hydroxide 0.2 wt%

The prepared ink composition was filtered using a member filter. The resulting transfer ink had a surface tension of 34.3 dyne / cm; Viscosity 3.5 cp; And pH 8.3. The prepared transfer ink was injected into a cartridge and subjected to a 10 m output test on a Mimaki JV4 output equipment. No ejection of the nozzle occurred during the test and no smell or smoke occurred when the printed image was sublimated onto the polyester fabric at a temperature of about 190 ° C. through a transfer machine.

Example 2

Mixed ethylene glycol solution in place of diethylene glycol as a thickener; An ink composition was prepared by using a mixed diol solution in place of butanediol as a moisturizer and by varying the composition ratio. The mixing ratio of the components for the preparation of the ink composition is as follows.

Red Dispersion Stock 18 wt%

Ultra pure water 52.8 wt%

Mixed Ethylene Glycol Solution 24 wt%

4 wt% of mixed diol solution

Sodium hydroxydodecanesulfonate 0.5 wt%

Sulfinol-465 0.5 wt%; And

Potassium hydroxide 0.2 wt%

Mixed ethylene glycol solution was prepared in the following composition ratio.

Ethylene glycol 15-35 wt%

Diethylene glycol 22-42 wt%

Triethylene glycol 5-15 wt%

Tetraethylene glycol 0.5-2.5 wt%

Polyethylene glycol 0.5 to 2.5 wt%; And

Amount to make the total composition ratio of ultra pure water 100 wt%

And the mixed diol solution was prepared in the following composition ratio.

Glycerin 30-50 wt%

Butanediol 4-14 wt%

Propanediol 2-8 wt%

Hexadiol 0.5-3.5 wt%

Normal methyl pyrrolidone (NMP) 0.2 to 2 wt%

0.5-4.5 wt% 2-pyrrolidone

Amount to make the total composition of ultra pure water 100 wt%

The prepared ink composition was filtered in the same manner as in Example 1 and subjected to a power test using the same equipment. As in Example 1, no smoke or odor occurred during the sublimation transcription process.

Comparative example

50 g of naphthalene formaldehyde polymer in 750 g of distilled water, C.I. 200 g of Disperse Blue 60 was added thereto, followed by stirring sufficiently. The prepared dispersion solution was placed in a bead mill and milled for about 8 hours to prepare a blue dispersion stock solution having an average particle size of about 160 nm. The following reactive chemicals were added to the obtained blue dispersion stock solution to prepare an ink composition.

20 wt% of blue dispersion stock solution;

Ethylene glycol 20 wt%;

DMSO 2 wt%;

NaOH 4 wt%; And

Distilled water 54 wt%

The prepared transfer ink was subjected to a power test using a Mimaki JV4 printing equipment. Some nozzles were dropped during the test process, and the smell and smoke were generated when the printed image was sublimated and transferred to the polyester fabric at a temperature of about 190 ° C. through a transfer machine.

The invention has been described in detail by presenting examples. The presented embodiments are illustrative and can be made by those skilled in the art to various modifications and modifications to the disclosed embodiments without departing from the spirit of the invention. The invention is not limited by the invention as such variations and modifications are limited only by the claims appended hereto.

The production method according to the invention makes it possible to produce transfer ink compositions with the required quality without the use of harmful chemicals. The prepared ink composition has the advantage that it does not emit harmful chemicals during the sublimation process and thus does not have a deleterious effect on workers and the environment.

Claims (5)

In the method for producing an aqueous transfer ink for inkjet printing, Selecting at least one disperse dye among red, blue and yellow; 15 to 30% by weight acrylic polymer dispersant; 15 to 35 weight percent of sublimable disperse dyes; And preparing a dye dispersion solution of 50 to 70% by weight of ultra pure water; Preparing a stock composition of an ink composition in which a bead of 0.2 to 0.5 mm is placed in a milling machine so that the average particle size of the disperse dye is 80 to 170 nm; Adding a reactive chemical to adjust the viscosity, surface tension and viscosity to prepare the ink composition; And Filtering the prepared ink composition with a member, wherein the reactive chemical comprises a pH buffer solution, a thickener, a surface tension modifier, an antifoaming agent and a moisturizing agent and the transfer ink prepared is 180 to 200 ° C. Lignin dispersant, acetonitrile, dimethyl sulfate, dimethanolamine, N, N-dimethyl formamide, formaldehyde, hydrazine, methyl ethyl ketone, triethylamine, dimethyl sulfoxide, morpholine, sodium hydroxide during the transcription process And tetrahydrofuran or urea are not discharged. The method of claim 1, wherein preparing the dye dispersion solution comprises adding an acrylic polymer dispersant to ultra pure water. In the aqueous transfer ink for inkjet printing, At least one disperse dye selected from the group consisting of red, blue, and yellow; Acrylic polymer dispersants; Ultra pure water; Potassium hydroxide pH buffer solution; Thickeners prepared from mixed ethylene glycol solutions in which any one or three to five mixtures thereof selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol and polyethylene glycol are mixed with ultra pure water; A moisturizer prepared from a mixed diol solution obtained by mixing any one or a mixture thereof selected from the group consisting of glycerin, butanediol, propanediol and hexadiol with ultra pure water, normal methylpyrrolidone (NMP) and 2-pyrrolidone Including, And lignin dispersant, acetonitrile, dimethyl sulfate, dimethanolamine, N, N- dimethylformamide, formaldehyde, hydrazine, methyl ethyl ketone, triethylamine, dimethyl sulfoxide, mor Aqueous transfer ink, characterized in that it does not discharge Pauline, sodium hydroxide, tetrahydrofuran or urea. The method of claim 3, wherein the sum of the disperse dye and the acrylic polymer dispersant is 13 to 19 wt%; Ultra pure water is 45 to 55 wt%; pH buffer solution is 0.1 to 0.4 wt%; Thickeners 25 to 35 wt%; The surfactant is 0.2 to 0.8 wt%; Antifoaming agent from 0.2 to 0.8 wt%; And the moisturizing agent is from 0.5 to 8 wt%. The method of claim 4, wherein the surface tension is between 33 and 36 dyne / cm; Viscosity is 2.0-4.0 cP; And pH 7-10.

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