KR100415934B1 - The pretreatment agent containing cationic agent for cotton fiber in ink-jet printing and its treating method - Google Patents

Abstract

The present invention relates to a cotton fiber pretreatment agent for inkjet printing containing a cationizing agent and a method of treating the same, in the pretreatment of cotton fiber when dyeing cotton fiber in the inkjet printing method, using a pretreatment containing a cationizing agent to The mildness improves the dyeing fixation rate of the reactive dye to the cotton fibers to obtain inkjet printed cotton fibers having excellent color development and high fastness.

Description

The pretreatment agent containing cationic agent for cotton fiber in ink-jet printing and its treating method}

The present invention relates to a cotton fiber pretreatment agent containing a cationizing agent and a method for treating the same, and specifically, in the pretreatment of cotton fibers when dyeing cotton fibers in an inkjet printing method, using a pretreatment containing a cationizing agent Cationizing cotton fibers improves the dyeing fixation rate of reactive dyes on cotton fibers to obtain inkjet printed cotton fibers having excellent color development and high fastness.

In general, printing is dyeing a part of the fiber or most of the pattern in a variety of colors using a screen plate, etc. At this time, when printing the salt solution on the fiber as it is, the salt solution is spread, so that the dye solution is mixed with the flavoring and printing How to make an arc and dye it so that the outline of the pattern does not spread.

The printing technology of such fibers is mainly made of plate printing (screen printing) or roller printing, which has contributed greatly to the development of chemical fibers and the dyeing industry.

However, such a printing technique has a long overall processing process, such as at least 15 days from the design of the design to color separation, drafting, engraving, etc., until the sample product comes out. The output of complex designs, such as photographic images, was limited.

This led to the emergence of inkjet printing. Inkjet printing technology is a method of printing dyes on textile fabrics by applying computer printing techniques to textiles. Simplify the processing process without going through the combination of color and color arcs, and can respond quickly to small quantity batch production, thereby reducing the delivery time as much as possible.

In addition, it is possible to flexibly change the color and design changes freely, as well as to express subtle color tones that cannot be achieved by printing process. Therefore, various designs can be processed in a short period of time. In addition, energy use can be dramatically reduced.

In order to apply the inkjet printing technology to the dyeing of textiles, the hardware of the textile printer, the software for operating the same with the computer, the development of ink applicable to various fibers, and the pretreatment of the dye ink to be fixed on the fibers quickly and effectively Development and pretreatment technology must be developed in combination.

In particular, in the pretreatment of the fiber, if printing without the pretreatment on the fiber, the dye ink is smeared immediately after being printed on the fiber by inkjet, so that a vivid color and image cannot be obtained, and most of the dye ink when washed Since it is washed off with water, the desired color cannot be obtained, so pretreatment must be done before the fiber is printed.

For example, in the case of cotton fibers, inks made of reactive dyes are mainly used. These reactive dyes are hydrolyzed by coexisting water in the dyeing process, so that the adhesion rate to cotton fibers is lower than that of other types of dyes. There is a fundamental problem that the dye is washed off without sticking well to the fiber, the color of the printed pattern after printing is blurred compared to the color of the original intended pattern.

In addition, in the case of the pattern salt, the color of the dye is often mixed in various colors instead of a single color, wherein the reactive dyes having the respective colors are not uniformly fixed on the fiber and are washed out unevenly upon washing with water. The final color of the dyed pattern has the disadvantage that it is quite different from the original color.

As a conventional technique for solving this problem, there is known a method for producing a dyeing material that improves the dyeing of cotton fibers by the reactive dyes of Korean Patent Publication No. 96-007930.

However, the known technique is to dye cotton after the cationic agent in the water is attached to the fiber by putting a cotton fiber in a solution in which the cationic agent and other drugs are dissolved in water and treated for a predetermined time at a predetermined temperature, which is a cotton fiber by using a dyeing technique It is not possible to dye in a variety of colors because it is dyed, and this has the disadvantage that it is not possible to change the design freely.

Accordingly, in the present invention, when dyeing the cotton fibers by inkjet printing technology, when the cotton fibers are pretreated, a portion of the cationic agent is mixed with a conventional pretreatment agent to cationic (cationize) the cotton fibers to electrostatic anion dyes by electrostatic attraction. It was effectively adsorbed onto cotton fibers to allow them to adhere.

In addition, as a pretreatment agent for cotton fibers used in the present invention, known natural or synthetic water-soluble polymers, urea or thiourea which increase the solubility of dyes and increase the water content in the fiber during steaming, and reactive dyes are chemically bonded to cotton fibers. To the neutral salt which improves the adsorption property of the reactive dye with respect to the alkaline substance and cotton fiber for further addition, the cationizing agent of this invention is further added, and it mixes in a fixed ratio, respectively, and prepares and uses a pretreatment agent.

The present invention was developed to solve the above problems, the inkjet printing cotton fiber pretreatment agent and the method of treatment of the present invention by improving the adhesion rate of the reactive dye to the cotton fiber during inkjet printing of the cotton fiber excellent color development and high fastness The purpose is to indicate.

In addition, the present invention is to improve the similarity between the color of the inkjet printed cotton fiber and the color on the original.

In order to achieve the above object, the cotton fiber pretreatment agent for inkjet printing according to the present invention is a pretreatment agent for inkjet printing of cotton fibers and cotton fiber blends or fabrics, wherein the cotton fiber pretreatment agent is a quaternary ammonium salt compound of polyepichlorohydrin It is characterized by consisting of 0.01 ~ 30wt% of mildener, 1 ~ 5wt% of water-soluble polymer, 1 ~ 20wt% of urea, 1 ~ 5wt% of alkaline substance, 1 ~ 10wt% of neutral salt and 50 ~ 90wt% of water.

In addition, the inkjet printing cotton fiber pretreatment method of the present invention is 5 to 10wt% of quaternary ammonium salt compound of polyepichlorohydrin, 1 to 5wt% of water-soluble polymer, 1 to 20wt% of urea, 1 to 5wt% of alkaline substance, neutral salt Preparing a pretreatment liquid by mixing 1-10 wt% and 50-90 wt% of water; Dipping cotton fibers in the pretreatment solution and using mangle to absorb 70 to 120% of the pretreatment solution to the cotton fibers; Pre-treating the cotton fibers with a dryer at a temperature of 120 ° C. for 3 minutes; Printing the pretreated cotton fibers with a reactive dye using an inkjet; Sticking the dye by heating the printed cotton fiber at a temperature of 100 ° C. for 30 minutes; And washing the cotton fibers with a 1 wt% aqueous solution of anionic surfactant at 20 ° C. for 20 minutes and then drying the cotton fibers.

Hereinafter, the cotton fiber pretreatment agent for inkjet printing and the processing method of the present invention will be described in detail.

First, pretreatment of the cotton fiber with a pretreatment agent is required to improve the adhesion rate of the reactive dye for inkjet printing to the cotton fiber.

Reactive dyes used for printing cotton fibers using inkjet have negative (-) charges as anions in water to give solubility in water. In the present invention, by using the properties of the reactive dyes as described above, the pretreatment agent containing the cationizing agent is pretreated to the cotton fibers to have a positive (+) charge of the cotton fibers and then inkjet printed with the reactive dyes.

In other words, if the cotton fiber has a cation (+) by a pretreatment agent containing a cationizing agent, and then the reactive dye having an anion (+) is printed on the cotton fiber, the reactive dye is strongly applied to the cotton fiber by mutual electrostatic attraction. Adsorbed and dyed

This will be described in more detail.

The cotton fiber pretreatment agent for inkjet printing of the present invention comprises a water-soluble polymer, urea or thiourea, an alkaline substance, a neutral salt and a cationic agent.

The water-soluble polymer is added to the dye so that the dye is adsorbed vividly to the cotton fiber without virtue, in the present invention, natural or synthetic water-soluble polymers sodium alginate, carboxymethyl cellulose, hydroxyethyl cellulose, locust bean gum, traga Gantt gum, guar gum, gum arabic, gelatin, polyvinyl alcohol and the like are used.

The urea is added to increase the solubility of the dye and prevent discoloration, and to increase the moisture content of the cotton fiber upon heating the pretreated cotton fiber, and thiourea may be used.

The alkaline substance is added to chemically fix reactive dyes and cotton fibers as well as refining and bleaching cotton fibers. In the present invention, sodium hydroxide, potassium hydroxide, calcium carbonate and the like are used.

The neutral salt is added to increase the adsorption of the reactive dye to the cotton fiber as a preparation for promoting dyeing, so as to be dyed solidly, in the present invention, sodium sulfate, sodium chloride and the like are used.

In addition, in the present invention, a cationizing agent is added to cationic cotton fibers in addition to the pretreatment agent.

As mentioned above, in order to cationic (cationize) the cotton fiber, a compound having affinity for the cotton fiber and having a cationic group in its molecular structure should be selected. In the present invention, a compound which gives a cationic group to the cotton fiber, that is, a cationic agent A quaternary ammonium salt-based organic compound prepared by amination of polyepichlorohydrin is used as shown in the following. The cationic agent is mixed with the preparations at a predetermined ratio to prepare a pretreatment agent and then pretreated with cotton fiber. After carrying out the cation and then printing the reactive dye on the pretreated cotton fiber by inkjet printing, the cation-containing cotton fiber and the anion-containing reactive dye are strongly adsorbed by the mutual electrostatic attraction.

Basic Structure of Organic Compounds of Quaternary Ammonium Salts

or

R: H or an alkyl group

^{X: Br -, Cl -,} I -, CH 3 COO -, CH 3 SO 4 -, C 2 H 5 SO 4 -, OH -

Hereinafter, the production method of the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the following examples are only examples to help understanding of the present invention, and the present invention is not limited thereto.

Example 1

As a cationizing agent, a pretreatment solution was prepared by mixing 5 wt% of a quaternary ammonium salt compound of polyepichlorohydrin, 1 wt% of sodium alginate, 10 wt% of urea, 1 wt% of sodium hydroxide, 5 wt% of sodium sulfate, and 78 wt% of water. After immersing the cotton fiber in the pretreatment solution, a mangle is used to remove some of the pretreatment solution trapped in the cotton fiber and to adjust the pretreatment solution to absorb 90% of the cotton fiber. This was dried for 3 minutes in a drier adjusted to a temperature of 120 ℃ to complete the pretreatment of cotton fibers.

After printing the pretreated cotton fibers with a reactive dye ink using an inkjet, the printed cotton fibers are heated for 30 minutes at a temperature of 100 ° C., and the dyes are adsorbed onto the cotton fibers to be dyed and fixed. After washing for 20 minutes at a temperature of 90 ℃ with 1wt% aqueous solution and dried to obtain a cotton fiber for inkjet printing.

Example 2

A pretreatment solution is prepared by mixing 5 wt% of a quaternary ammonium salt compound of polyepichlorohydrin, 1 wt% of hydroxyethyl cellulose, 10 wt% of thiourea, 1 wt% of potassium hydroxide, 5 wt% of sodium chloride, and 78 wt% of water. . After immersing the cotton fiber in the pretreatment solution, a mangle is used to remove some of the pretreatment solution in the cotton fiber and to adjust the pretreatment solution to be absorbed by 90% of the cotton fiber. This was dried for 3 minutes in a drier adjusted to a temperature of 120 ℃ to complete the pretreatment of cotton fibers.

After printing the pretreated cotton fibers with a reactive dye ink using an inkjet, the printed cotton fibers are evaporated for 30 minutes at a temperature of 100 ° C., and the dyes are fixed to the cotton fibers. After washing with water at a temperature of 90 ° C. for 20 minutes, it was dried to obtain cotton fibers for inkjet printing.

Comparative example

A cationic agent is not used at all, and a pretreatment liquid is prepared by mixing 1 wt% of sodium alginate, 10 wt% of urea, 1 wt% of sodium hydroxide, 5 wt% of sodium sulfate, and 83 wt% of water. After immersing the cotton fiber in the pretreatment solution, the mangle was used to remove some of the pretreatment solution in the cotton fiber and to adjust the pretreatment solution to be absorbed by 90% of the cotton fiber, followed by drying in a dryer at a temperature of 120 ° C. for 3 minutes to complete the pretreatment of the cotton fiber. do.

The inkjet printed cotton fibers are obtained by dyeing and post-treating the pretreated cotton fibers using the inkjet in the same manner as in Examples 1 and 2.

Table 1 shows the results of comparing color development performance and color fastness of the inkjet printed cotton fibers obtained in Examples 1 and 2 and Comparative Examples, respectively.

◎: Very good, ○: Good, △: Normal, ×: Poor

(Note) Comparative example: Cotton fiber pretreated with a pretreatment agent without adding a cationizing agent

Examples 1 and 2: cotton fibers pretreated with a pretreatment with a cationizing agent

As described above, the present invention, in the process of dyeing cotton fibers in the inkjet printing method, as a pretreatment agent of cotton fibers, a pretreatment agent by mixing a predetermined amount of cationic agents in addition to known water-soluble polymers, urea, alkaline substances and neutral salts, etc. After the preparation is to pretreat the cotton fiber for inkjet printing.

In addition, in the present invention, a quaternary ammonium salt-based organic compound prepared by amination of polyepichlorohydrin was used as the cationizing agent, but the present invention is not limited thereto. Of course, modifications can be made.

As described above, according to the inkjet printing cotton fiber pretreatment agent and the method for treating the same, in the processing step of dyeing the cotton fiber by inkjet printing method, the cotton fiber is cationic using a pretreatment agent containing a cation agent during the pretreatment of the cotton fiber. By improving the adhesion rate of reactive dyes to cotton fibers, dyes are not dyed and vividly dyed, so it has excellent color development, and the color similarity between the color of inkjet printed cotton fibers and the original pattern is improved, and color fastness including washing fastness The back is high.

In addition, since the cationized cotton fiber is printed by the inkjet method, the color density is not biased, and the color is uniformly dyed overall, and the color and the design can be changed in various ways.

Claims (3)

In the pretreatment agent for inkjet printing of cotton fibers and cotton fiber blends or fabrics, 0.01 to 30 wt% of cationic agent, which is a quaternary ammonium salt compound of polyepichlorohydrin, 1 to 5 wt% of water-soluble polymer, and urea 1 to A cotton fiber pretreatment agent for inkjet printing comprising a cationic agent, comprising 20 wt%, 1-5 wt% of alkaline substance, 1-10 wt% of neutral salt, and 50-90 wt% of water. delete 5-10 wt% of quaternary ammonium salt compound of polyepichlorohydrin, 1-5 wt% of water-soluble polymer, 1-20 wt% of urea, 1-5 wt% of alkaline substance, 1-10 wt% of neutral salt, 50-90 wt% of water Preparing a pretreatment liquid; Dipping cotton fibers in the pretreatment solution and using mangle to absorb 70 to 120% of the pretreatment solution to the cotton fibers; Pre-treating the cotton fibers with a dryer at a temperature of 120 ° C. for 3 minutes; Printing the pretreated cotton fibers with a reactive dye using an inkjet; Sticking the dye by heating the printed cotton fiber at a temperature of 100 ° C. for 30 minutes; And The cotton fiber pre-treatment method containing a cationizing agent comprising the step of washing the cotton fiber in a 1wt% aqueous solution of anionic surfactant at 90 ° C. for 20 minutes and drying.