KR20230129326A - Pigment printing method using digital textile printing, excellent in color development and fastness - Google Patents

Abstract

According to a pigment printing method using digital printing of the present invention, the color development can be improved and color bleeding can be prevented by coagulating a pigment ink sprayed on the surface of the fabric, the fastness of pigment ink can be maintained by the resin that firmly settles on the fabric surface, and solubility is excellent so that the ink can be sprayed without clogging an inkjet head nozzle.

Description

Pigment printing method using digital printing, excellent in color development and fastness}

The present invention relates to a pigment printing method using digital printing, and more specifically, to a pigment printing method that uses pigment ink but has excellent color vividness and color development, and has high fastness to washing and rubbing.

Printing is a fabric dyeing method that can produce various colors and patterns, and includes screen printing, roller printing, rotary printing, and digital printing. Among these, digital textile printing is gradually expanding in response to a market environment where trends change quickly and demand high-resolution, colorful colors and elaborate designs.

The digital printing method applies computer-based hardware devices and CAD software technology to printing technology, and the process is greatly simplified compared to the conventional printing process using screen or roller methods, thereby improving productivity. In order to perform digital printing, a textile output device, that is, hardware, software to operate it, and various printing inks are required.

Dye ink or pigment ink is used as printing ink. Dye ink has the advantage of excellent penetration into fabric and a soft texture on the surface of the dyed fabric. In order to fix the dye, a series of processes are required, such as a vaporization process and a process of washing excess dye and pretreatment agent.

In comparison, pigment ink, unlike dye ink, has the advantage of being able to be dyed in a simple process because it does not require pretreatment, vaporization, or water washing. However, pigment ink adheres to the fiber in the form of particles, so it has poor washing and friction fastness, has low clarity and color development, and has the problem of clogging the nozzle through which ink is ejected when the emulsion resin, which is a fixative, dries by volatilization. .

Republic of Korea Patent Publication No. 10-1394324 (Pigment printing and color burnout simultaneous processing method)

Accordingly, the technical problem to be solved by the present invention was created to solve the problems of the prior art described above. The present invention provides a pigment printing method that has excellent color development and fastness and can digitally print pigment ink without clogging the nozzle. It is provided.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

A method of printing fabric using digital printing according to the present invention to solve the above technical problem includes the steps of applying a resin mixture containing a metal salt to the surface of the fabric; Drying the fabric coated with the resin mixture; Printing an image on the surface of the fabric by spraying a pigment ink containing pigment, urethane resin, and 1,2-alkane diol onto the fabric in which the resin mixture solution is dried using a digital printing machine; And it may include quickly drying the fabric on which the image is printed by spraying hot air at a temperature of 150°C to 200°C for 200 to 300 seconds.

The metal salt includes a divalent metal ion and an anion, and the divalent metal ion is,

It may be any one of Ca2+, Cu2+, Ni2+, Mg2+, Zn2+, and Ba2+, and the anion may be any one of Cl-, NO3-, I-, and Br-.

The resin mixture may be any one of polyvinyl pyrrolidone, polyethylene oxide, carboxymethyl cellulose, hydroxyethyl cellulose, and polyvinyl alcohol.

The urethane resin may have an average molecular weight of 100,000 to 200,000.

With respect to the entire pigment ink, it is preferable that the urethane resin is added in an amount of 3% to 12% by weight, and the 1,2-alkane diol is added in an amount of 3% to 30% by weight.

According to the present invention, the pigment ink sprayed on the fabric surface is coagulated to improve color development and prevent color bleeding, while the fastness of the pigment ink can be maintained by the resin that firmly settles on the fabric surface, and its solubility is excellent for inkjet use. It can be sprayed without clogging the head nozzle.

1 is a flowchart showing the entire process of the pigment printing method according to the present invention.
Figures 2 to 4 are C (cyan) color printing fabrics manufactured according to the present invention, Figures 5 to 7 are M (magenta) color printing fabrics, and Figures 8 to 10 are Y (yellow) color printing fabrics. , Figures 11 to 13 are test reports for K (black) color printing fabric.

In order to fully understand the present invention, its operational or functional advantages, and the objectives achieved by practicing the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the present invention will be described in more detail with reference to the attached drawings. Since the present invention can be subject to various changes and have various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Additionally, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless clearly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

1 is a flowchart showing the entire process of the pigment printing method according to the present invention.

Referring to Figure 1, the pigment printing method according to the present invention includes the steps of applying a resin mixture containing a metal salt to the surface of the fabric (S110), drying the fabric to which the resin mixture has been applied (S120), and the resin mixture. A step of printing an image on the surface of the fabric by spraying a pigment ink containing pigment, urethane resin, and 1,2-alkane diol onto the dried fabric with a digital printing machine (S130), and drying the fabric on which the image is printed. It is made including (S140).

The step of applying the resin mixture to the surface of the fabric (S110) is a step of applying the resin mixture to the surface of the fabric to improve the cohesion of the pigment ink printed in the step described later. Here, the fabric may be a polyester fabric. The resin mixture may be composed of a mixture of a metal salt consisting of divalent metal ions such as Ca2+, Cu2+, Ni2+, Mg2+, Zn2+, and Ba2+ and anions such as Cl-, NO3-, I-, and Br-, a synthetic resin, and water.

Here, the metal salt coagulates the pigment ink applied later to improve the color development of the pigment, and at the same time increases the viscosity of the pigment ink, suppressing excessive penetration of the pigment ink into the fabric and preventing color bleeding. . It is preferable to mix 15 to 30 parts by weight of such metal salt with respect to 100 parts by weight of the resin mixture.

The synthetic resin mixed with metal salt can be any one of polyvinylpyrrolidone, polyethylene oxide, carboxymethyl cellulose, hydroxyethyl cellulose, and polyvinyl alcohol. As the molecular weight of such resin increases, the molecular chain becomes longer, making it a polyester fabric. is more firmly established. Therefore, the firmly fixed synthetic resin can improve color development by preventing the pigment ink applied later from spreading. Water is added to adjust the viscosity of the resin mixture, and a water-soluble organic solvent may be added.

The resin coating solution formed in this way is applied to the surface of the fabric with a uniform thickness, and application methods such as dip coating, roller coating, spray coating, and inkjet coating can be used.

When the resin coating liquid is applied in this way, the fabric is heated and dried (S120). Heat drying is preferred for drying the resin coating liquid, which can shorten the drying time compared to natural drying.

When the resin coating liquid dries, pigment ink is sprayed to print an image on polyester fabric (S130). The pigment ink consists of pigment, water, urethane resin with an average molecular weight of 100,000 to 200,000, and 1,2-alkane diol. .

Pigments may be organic or inorganic. Organic pigments include azo pigments such as azo lake pigments, insoluble azo pigments, condensed azo pigments, and chelated azo pigments, phthalocyanine pigments, perylene pigments, perinone pigments, anthraquinone pigments, Polycyclic pigments such as quinacridone pigment, dioxazine pigment, thioindigo pigment, isoindolinone pigment, isoindoline pigment, quinophthalone pigment, diketopyrrolopyrrole pigment, basic dye type lake, acid dye type lake, etc. Dye lake pigments, nitro pigments, nitroso pigments, aniline black, daylight fluorescent pigments, etc. can be used. Additionally, as inorganic pigments, metal oxide pigments such as titanium dioxide, zinc oxide, and chromium oxide, and carbon black may be used.

The urethane resin preferably has an average molecular weight of 100,000 to 200,000 to balance physical properties such as storage stability and viscosity, and is preferably added in an amount of 3% to 12% by weight based on the total ink.

1,2-alkane diols are compatible with water and are used to stably dissolve or disperse pigments and support them, such as 1,2-hexanediol, 1,2-pentanediol, 4-methyl-1,2 -1,2-alkane diols with 5 or 6 carbon atoms, such as pentanediol, can be used. The amount of 1,2-alkane diol added is preferably 3% to 30% by weight based on the total ink.

The pigment ink formulated in this way is supplied to a digital printing machine and sprayed. The digital printing machine has an inkjet head mounted on a carriage that moves in a predetermined direction, and the inkjet head moves according to the movement of the carriage, spraying pigment ink to print an image. do. At this time, the pigment ink being sprayed can be discharged without clogging the inkjet head nozzle because the pigment is stably dissolved.

The step of drying the fabric on which the image is printed (S140) may be a step of quickly drying the fabric by spraying hot air at a temperature of 150°C to 200°C for 200 to 300 seconds. This is to improve fastness by increasing the fixation speed or fixation rate of the pigment through rapid drying.

The printing method of the present invention improves color development by coagulating the pigment ink sprayed on the surface of the polyester fabric and prevents the color from bleeding, while maintaining the fastness of the pigment ink by the resin that firmly settles on the polyester fabric surface. It has excellent solubility and can be sprayed without clogging the inkjet head nozzle.

Figures 2 to 4 are C (cyan) color printing fabrics manufactured according to the present invention, Figures 5 to 7 are M (magenta) color printing fabrics, and Figures 8 to 10 are Y (yellow) color printing fabrics. , Figures 11 to 13 are test reports for K (black) color printing fabric.

For reference, these tests were conducted at Dytech Research Institute and were conducted using a blended fabric of 50% by weight polyester and 50% by weight cotton as the sample fabric. Tables 1 and 2 show the △E VALUE and K/S VALUE of the sample fabrics, and Table 3 shows the fastness test results of the sample fabrics.

Referring to Tables 1 and 2, it can be seen that the samples prepared according to the present invention have excellent leveling and development properties as well as excellent fastness.

As described above, although the present invention has been described using limited embodiments and drawings, the present invention is not limited to the above embodiments, and various modifications and variations can be made from these descriptions by those skilled in the art. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the claims and equivalents thereof as well as the claims described later.

Claims (4)

In the method of printing fabric using digital printing,
Applying a resin mixture containing a metal salt to the surface of the fabric;
Drying the fabric coated with the resin mixture;
Printing an image on the surface of the fabric by spraying a pigment ink containing pigment, urethane resin, and 1,2-alkane diol onto the fabric in which the resin mixture solution is dried using a digital printing machine; and
A step of rapidly drying the fabric on which the image is printed by spraying hot air at a temperature of 150°C to 200°C for 200 to 300 seconds,
The metal salt contains a divalent metal ion and a monovalent anion, and is mixed in an amount of 15% to 30% by weight based on 100 parts by weight of the resin mixture,
A pigment printing method using digital printing, characterized in that the urethane resin has an average molecular weight of 100,000 to 200,000.
According to paragraph 1,
The divalent metal ion is,
Any one of Ca2+, Cu2+, Ni2+, Mg2+, Zn2+, Ba2+,
The anion is,
A pigment printing method using digital printing, characterized in that it is one of Cl-, NO3-, I-, and Br-.
According to paragraph 1,
The resin mixture is,
A pigment printing method using digital printing, comprising any one of polyvinylpyrrolidone, polyethylene oxide, carboxymethylcellulose, hydroxyethylcellulose, and polyvinyl alcohol.
According to paragraph 1,
A pigment printing method using digital printing, characterized in that the urethane resin is added in an amount of 3% to 12% by weight, and the 1,2-alkane diol is added in an amount of 3% to 30% by weight, based on the entire pigment ink.