KR20040050226A - The pretreating agent for reactive dyes onto silk fiber in ink-jet printing and its treating method - Google Patents

Abstract

PURPOSE: A primer of ink-jet printing for reactive dyes on silk is characterized by containing a run inhibitor, an absorbent, an alkali material and water and using the run inhibitor mixed hydroxy ethyl cellulose and sodium alginate. The primer is capable of increasing fixed ratio of the reactive dyes, having excellent color development and expressing delicate pattern. In washing the printed silk, the primer is removed completely. Therefore, the silk is soft and lustrous. A treating method thereof is provided. CONSTITUTION: A primer of ink-jet printing for reactive dyes on silk comprises 2.6-4.0wt.% of a run inhibitor comprised of hydroxy ethyl cellulose and sodium alginate, 5.0-10.0wt.% of an absorbent, 0.2-1.0wt.% of an alkali material and 85.0-92.2wt.% of water. A treating method of the primer on the silk is as follows: preparing the primer; dipping the silk into the primer; absorbing the primer into the silk with a mangle; and then drying the silk at 100-130deg.C for 1-5min.. The silk absorbs 50-150% of the primer.

Description

The pretreating agent for reactive dyes onto silk fiber in ink-jet printing and its treating method}

The present invention relates to a pretreatment agent for ink jet printing for reactive dyes on silk fibers and a method of treating the same, and specifically, in an ink jet printing process for silk fibers using reactive dyes, reactive dye ink does not spread on silk fibers immediately after printing. It is absorbed immediately and reduces the loss of dye at the same time, and it has good color development.It is easy to detach without leaving pretreatment agent on silk fiber when washed, and it is used for reactive dyes on silk fiber which has the unique luster and soft touch of silk fiber. A pretreatment for inkjet printing and a method of treating the same.

In general, the inkjet printing technology is to produce a printing fabric by printing and post-processing a printed image designed on a computer directly on the fiber through the inkjet printing method, the conventional printing process that takes more than 15 days work time film By eliminating complicated processes such as production and engraving (copper plate), it can be shortened to 1-2 days.

In addition, various colors and designs can be freely expressed, and only the necessary dye ink is sprayed on the necessary parts, so there is almost no residual dye, so that the pollution of the conventional printing method can be compensated for, and the individuality of the product can be improved and small quantities can be produced at the same time. As it is very easy to cope with the various demands and new trends of the market, its use is increasing recently.

Inkjet printing is mainly used for textiles such as silk, cotton, and polyester. After printing computer images with dye ink on pretreated textile fabrics, they are processed to manufacture various fashion-related products such as women's clothing, scarves and bedding. do.

In this case, the pretreatment agent is treated without physical and chemical damage to the fiber to improve the color fastness by increasing the rate of fixation of the dye to the fiber. It is smeared immediately after being printed on, and even when washed, most of the dye ink is washed out with water, so there is a problem in that a user cannot obtain a desired color or image.

Therefore, it can be considered that the development of a pretreatment agent and a complex development of a pretreatment technology for adsorbing and fixing dye ink to fibers quickly and effectively during inkjet printing are very important.

On the other hand, protein fibers such as silk has fibroin, which is a main component, composed of several kinds of amino acids, and has a hydroxyl group (-OH), a carboxyl group (-COOH), an amine group (-NH ₂ ), and the like. In printing, the amine group of the silk fiber is dyed by covalent bonding of the reactive dye reactor.

However, the reactive dye is also covalently bonded to the hydroxy group (-OH) of the anti-smear agent, which is one of the elements of the pretreatment to be treated to the fiber, and thus the pre-treatment agent, that is, the anti-smear agent in the process of washing the inkjet printed fiber At the same time as washing off part of the reactive dye combined with the bleeding agent is washed together, there is a problem that the loss of the dye is generated, resulting in poor color development.

In addition, silk fibers have a disadvantage in that the dye ink solution is slower than cotton fibers, so that the ink spreads well immediately after the inkjet printing and is not immediately absorbed into the fibers.

In addition, silk fiber is an important factor that determines the quality of the soft touch, there is a fear that the silk fiber feels slightly hard and gloss if the pretreatment agent treated on the silk fiber is not washed thoroughly after the printing and coloring process.

However, until now, no technology has been developed to solve these problems at one time.

In addition, the present applicant is directed to a pretreatment agent and a method for pretreating cotton, polyester, and silk fibers in the preliminary steps of an inkjet printing process as in Korean Patent Application Nos. 2001-0009514, 2001-0065725, and 2002-0048236. The present invention has been developed in order to overcome such a problem, and relates to a pretreatment agent and a method for treating the silk fiber when inkjet printing silk fiber with reactive dye ink.

The present invention was developed in order to solve the above problems, the pretreatment agent of the inkjet printing for reactive dyes for the silk fiber of the present invention and the method for treating the same, the reactive dye ink does not spread well on the silk fiber immediately after the inkjet printing It is absorbed immediately so that a clear printed product can be obtained.

Another object of the present invention is to avoid the combination of the reactive dye and the pretreatment to minimize the loss of the dye to obtain a silk fiber with good color development.

Still another object of the present invention is to remove the pretreatment agent in the silk fiber during the post-treatment process, without leaving the pretreatment agent, so that the silk fiber has a unique luster and soft touch.

In order to achieve the above object, the pretreatment of the inkjet printing agent for reactive dyes for the silk fiber according to the present invention is 2.6 to 4.0% of a blotting inhibitor consisting of hydroxyethyl cellulose and sodium alginate, and 5.0 to 10.0 wt% of a moisture absorbent and , 0.2-1.0wt% alkaline substance and 85.0-92.2wt% water, wherein the anti-spill agent is a mixture of 2.0-3.0wt% of hydroxyethyl cellulose and 0.6-1.0wt% of sodium alginate or hydride Natural or synthetic water soluble at least one selected from carboxymethyl cellulose, locust bean gum, tragaganth gum, guar gum, gum arabic, gelatin, polyvinyl alcohol, at 2.0-3.0 wt% of oxyethyl cellulose and 0.5-0.7 wt% of sodium alginate. It is characterized in that the polymer 0.1 ~ 0.3wt% is additionally mixed.

In addition, the pretreatment method of the inkjet printing for reactive dyes for the silk fiber according to the present invention, the bleeding inhibitor 2.6-4.0% consisting of hydroxyethyl cellulose and sodium alginate, 5.0-10.0wt% hygroscopic agent, 0.2-1.0 alkaline substances preparing a pretreatment consisting of wt% and 85.0-92.2 wt% of water; Immersing the silk fibers in the pretreatment agent and absorbing the pretreatment agent into the silk fibers by 50-150% using mangles; And drying the silk fibers in a dryer at a temperature of 100 to 130 ° C. for 1 to 5 minutes.

Hereinafter, the pretreatment agent for inkjet printing for reactive dyes and the treatment method for the silk fiber of the present invention will be described in detail.

First, in the pretreatment step for improving the fixing rate of the reactive dye ink to the silk fiber before inkjet printing the silk fiber, the pretreatment agent of the ink jet printing for reactive dyes for the silk fiber according to the present invention, respectively It consists of an anti-smear, a moisture absorbent, an alkaline substance and water.

The lubricating agent used as the bleeding inhibitor is to prevent the dye ink from spreading after being printed on the fiber fabric. Preferably, hydroxyethyl cellulose and sodium alginate are essentially used. In addition, carboxymethyl cellulose, locust bean gum, Natural or synthetic water-soluble polymers such as tragaganth gum, guar gum, gum arabic, gelatin, polyvinyl alcohol and the like can be used.

That is, the bleeding inhibitor may be a mixture of 2.0 to 3.0 wt% of nonionic hydroxyethyl cellulose and 0.6 to 1.0 wt% of sodium alginate, or 2.0 to 3.0 wt% of hydroxyethyl cellulose and 0.5 to 0.7 of alginate. 0.1 wt% to 0.3 wt% of other additives is added to the wt% mixture.

This is because hydroxyethyl cellulose has an initial absorption and swelling property of the ink solution faster than other solvents, so that the ink bleeding prevention effect on the fiber is most excellent, and thus a printing material having a vivid pattern can be obtained.

On the other hand, the hydroxyethyl cellulose is excellent in the initial swelling by water, but the low solubility in water in the post-washing step washing process is left in the fiber because of this, the silk fiber feels somewhat hard and the gloss may be reduced There is used a mixture of a predetermined amount of high solubility sodium alginate to compensate for this.

In addition, the reactive dye covalently bonds with the amine group of the silk fiber and also forms a covalent bond with the hydroxy group (-OH) of hydroxyethyl cellulose, which is an anti-smear agent, thereby causing a loss of the reactive dye. Keeping uniformly mixing the sodium alginate hardly form a covalent bond anionic reactive dye (D-SO ₃ ^-) has a carboxyl group of the sodium ^{alginate-anion} group ^{(-COONa ↔ -COO + Na +)} (-COO -) Due to the ion repulsive force with, it becomes difficult to access not only sodium alginate but also hydroxyethyl cellulose mixed uniformly, and thus no bonding is possible, and only covalent bonding with silk fibers is performed.

That is, while the hydroxyethyl cellulose and sodium alginate are completely uniformly mixed with the fiber fabric, after printing and coloring process, sodium alginate having good solubility in water is first dissolved during washing, which is a post-treatment process. By significantly increasing the rate of penetration of water into the hydroxyethyl cellulose moiety, the hydroxyethyl cellulose is more easily washed with water.

Therefore, after washing with water, hydroxyethyl cellulose and the like do not remain in the fiber fabric, and it is possible to maintain the soft touch and luster peculiar to the silk fiber as it is.

In addition, when hydroxyethyl cellulose alone is used, it is possible to obtain a high quality inkjet printing material by mixing with sodium alginate that the loss of the reactive dye has occurred, while improving the flushability of the anti-smearing agent and reducing the loss of the dye. Become.

The moisture absorbent increases the solubility of the reactive dye and prevents discoloration and at the same time increases the moisture content of the fiber when the pretreated silk fiber is heated, preferably urea or thiourea, and the amount thereof is 5.0 to 10.0 wt. %to be.

At this time, when the amount of the moisture absorbent is 5.0wt% or less, sufficient moisture cannot be absorbed during the color development process due to heat, so that the dyeing of the reactive dye ink on the silk fiber becomes incomplete, resulting in poor color development. The amount of absorption increases so much that bleeding occurs.

The alkaline substance chemically fixes the reactive dye and the silk fiber. Preferably, sodium hydroxide, potassium hydroxide, calcium carbonate, and the like are used, and the amount thereof is 0.2 to 1.0 wt%.

At this time, when the alkaline material is 0.2wt% or less, sufficient fixation of the dye ink is not achieved, and when used at 1.0wt% or more, the silk fiber may be damaged and ink smear may occur.

The water is to dissolve the pretreatment aid to facilitate the pretreatment on the silk fiber to make a solution, the amount is 85 ~ 92.2 wt%.

Next, a pretreatment method and an inkjet printing method of the inkjet printing for reactive dyes for silk fibers using the pretreatment agent having the above-described configuration will be described sequentially.

First, the pretreatment method of the silk fiber according to the present invention is as follows.

Step 1: Immersion Stage

After immersing the silk fiber in the pretreatment for 5-30 seconds, it is controlled to absorb 50 to 150% of the weight of the pretreatment agent by using a compression roller such as a mangle (mangle).

Second Process: Drying Step

The silk fibers are dried for 1 to 5 minutes in a drier controlled at 100 to 130 ° C. so that the moisture in the silk fibers is dried and only the pretreatment agent remains.

Next, a method of inkjet printing the silk fibers pretreated with the pretreatment agent prepared according to the present invention using a reactive dye will be described.

3rd process: printing and coloring

After the inkjet printing using the reactive dye ink on the pre-treated silk fiber, the color is developed by heating for 10 to 30 minutes at a temperature of 102 ~ 130 ℃.

4th process: cleaning and completion

Next, water-washed with a 0.1% aqueous solution of anionic surfactant based on the weight of the colored silk fiber at a temperature of 65 to 75 ° C. for 20 to 30 minutes and dried to obtain an inkjet printed silk fiber.

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

Example

A pretreatment agent was prepared by mixing 2.5 wt% of hydroxyethyl cellulose as a bleeding inhibitor, 0.8 wt% of sodium alginate, 8.0 wt% of urea as a hygroscopic agent, 0.5 wt% of potassium hydroxide as an alkaline substance, and 88.2 wt% of water.

Subsequently, after immersing the silk fiber in the pretreatment agent, the weight of the pretreatment agent was adjusted to be 100% absorbed by the weight of the silk fiber using a mangle and dried in a dryer at a temperature of 120 ° C. for 3 minutes.

Next, after inkjet printing on the pretreated silk fibers with ink of a reactive dye, the resultant was colored by heating for 30 minutes at a temperature of 105 ??.

This was washed with water at a temperature of 70 ° C. for 20 minutes with an aqueous 0.1 wt% anion surfactant based on the weight of the fiber, followed by drying to obtain inkjet printed silk fibers.

Comparative Example 1

A pretreatment agent consisting of only 0.8 wt% of sodium alginate as an anti-smearing agent, 8.0 wt% of urea as a hygroscopic agent, 0.5 wt% of potassium hydroxide as an alkaline substance, and 90.7 wt% of water was prepared, followed by using this pretreatment agent. The silk fiber was pretreated under the same conditions as in the example and then inkjet printed.

Comparative Example 2

Only 2.5 wt% of hydroxyethyl cellulose was used as an anti-smearing agent, and a pretreatment having a composition of 8.0 wt% of urea as a hygroscopic agent, 0.5 wt% of potassium hydroxide as an alkaline substance, and 89.0 wt% of water was used. The silk fiber was subjected to pretreatment under the same conditions as in Example, and then inkjet printed.

The results of comparative analysis on the sharpness, color development, touch, and wash durability of the patterns of the inkjet printed silk fibers obtained in the above Examples and Comparative Examples 1 and 2 are shown in Table 1 below.

Looking at the results according to Table 1, when hydroxyethyl cellulose and sodium alginate were used as a bleeding inhibitor in the pretreatment agent as in Example, excellent results were obtained in all items.

On the other hand, when only sodium alginate of Comparative Example 1 was used, the bleeding agent of the bleeding preventive agent was good when washed with water, which did not affect the feel of the fiber, but the initial absorbency of the ink was poor, resulting in poor sharpness of the pattern and slight bleeding. Was not excellent,

In the case of using only hydroxyethyl cellulose as the bleeding inhibitor as in Comparative Example 2, the initial absorbency of the ink is good and the sharpness of the pattern is very good, but the dye loss is reduced as the reactive dye ink is combined with not only the silk fiber but also the bleeding inhibitor. It occurred and the color development was not good, and the desorption property of the bleeding inhibitor was bad, resulting in poor texture of the fibers.

Therefore, in the present invention, the silk fiber is pretreated using a pretreatment agent at the stage before inkjet printing the silk fiber, but the pretreatment agent is composed of a predetermined amount of a bleeding agent, a hygroscopic agent, an alkaline material and a water pretreatment agent, and the bleeding. It was found that the inhibitor should be composed of hydroxyethyl cellulose and sodium alginate as essential components.

As described above, according to the pretreatment agent of the inkjet printing agent for reactive dyes and the processing method thereof for the silk fiber of the present invention, in the step of dyeing silk fibers by inkjet printing method using a reactive dye, the anti-smearing agent, Pretreatment of the silk fiber with a pretreatment agent mixed with a predetermined amount of an absorbent, an alkaline substance and water, but by using a mixture of hydroxyethyl cellulose and sodium alginate as the anti-spill agent to improve the adhesion rate of the reactive dye ink to the silk fiber Since the dye does not spread and is dyed vividly, silk fibers having excellent color development and sharp patterns can be obtained.

In addition, by removing the inkjet printed silk fibers neatly so that the pretreatment agent does not remain in the silk fibers at the time of washing, silk fibers unique to the silk fiber feel smooth and excellent gloss can be obtained.

Claims (8)

Reactivity to silk fibers comprising 2.6 to 4.0% of a bleeding inhibitor consisting of hydroxyethyl cellulose and sodium alginate, 5.0 to 10.0 wt% of a hygroscopic agent, 0.2 to 1.0 wt% of alkaline substances and 85.0 to 92.2 wt% of water Pretreatment for inkjet printing for dyes. The method of claim 1, The anti-smearing agent is a pretreatment agent for inkjet printing for reactive dyes for silk fibers, characterized in that a mixture of hydroxyethyl cellulose 2.0 ~ 3.0wt% and sodium alginate 0.6 ~ 1.0wt%. The method of claim 1, The spreading agent is at least one of hydroxyethyl cellulose 2.0-3.0wt% and sodium alginate 0.5-0.7wt%, carboxymethylcellulose, locust bean gum, tragaganth gum, guar gum, gum arabic, gelatin, polyvinyl alcohol A pretreatment agent for inkjet printing for reactive dyes for silk fibers, characterized in that the selected natural or synthetic water-soluble polymer is additionally mixed 0.1 ~ 0.3wt%. The method of claim 1, The moisture absorbent is a pretreatment agent for inkjet printing for reactive dyes for silk fibers, characterized in that selected from urea, thiourea. The method of claim 1, The alkaline material is a pretreatment for inkjet printing for reactive dyes for silk fibers, characterized in that selected from sodium hydroxide, potassium hydroxide, calcium carbonate. Preparing a pretreatment agent consisting of 2.6 to 4.0% of an anti-smearing agent consisting of hydroxyethyl cellulose and sodium alginate, 5.0 to 10.0 wt% of an absorbent, 0.2 to 1.0 wt% of an alkaline substance, and 85.0 to 92.2 wt% of water; Immersing the silk fibers in the pretreatment agent and absorbing the pretreatment agent into the silk fibers by 50-150% using mangles; And A method for pretreatment of inkjet printing for reactive dyes for silk fibers, comprising the steps of drying the silk fibers for 1 to 5 minutes at a temperature of 100 to 130 ° C. with a dryer. The method of claim 6, The anti-smearing agent is a pre-treatment method for inkjet printing for reactive dyes for silk fibers, characterized in that the mixture of hydroxyethyl cellulose 2.0 ~ 3.0wt% and sodium alginate 0.6 ~ 1.0wt%. The method of claim 6, The spreading agent is at least one of hydroxyethyl cellulose 2.0-3.0wt% and sodium alginate 0.5-0.7wt%, carboxymethylcellulose, locust bean gum, tragaganth gum, guar gum, gum arabic, gelatin, polyvinyl alcohol A method for pretreatment of inkjet printing for reactive dyes for silk fibers, characterized in that the selected natural or synthetic water-soluble polymers 0.1 to 0.3wt% is additionally mixed.