KR960013582B1 - Method for dyeing of polyester fabric - Google Patents

Abstract

The polyester fabric comprising the general polyester yarn and the polyester superfine yarn is dyed by using disperse dyes. The initial pH of the dye bath is adjusted in the range of 9.5-11.5 and the end pH is 7.0-9.5 using an alkali assistant such as caustic soda or sodium borate. Obtained fabric shows a clear color by improving a croma and reducing the spot of the fabric after dyeing.

Description

How to dye polyester forge

The present invention relates to a dyeing method of a polyester forge containing a polyester microfiber, and to a dyeing method of a polyester forge which can exhibit a more vivid color by reducing stains and improving saturation of the forge after dyeing.

In general, microfiber yarns are divided into rectangular, divided and extracted.

In any case, microfiber dyeing is known to require careful attention due to various dyeing problems compared to normal yarn. In particular, in dyed colors, the color of the stained pores after dyeing due to uneven dyeing and the decrease in color density are more turbid than in the case of a cloth composed of ordinary yarn, which makes it difficult to express bright and vivid colors. However, microfiber yarns tend to have a softer touch and describe various surface effects than ordinary regular yarns.

Therefore, the development of a dyeing method that can improve the dyeability while utilizing the excellent touch and surface effect of microfiber has emerged as an important task.

Microfiber yarns cause the reduction of colored light due to the diffuse reflection of incident light due to the increase of the surface area, resulting in a decrease in color concentration. In particular, a large amount of impurities are attached to the surface of the yarn, which reduces the color light and impedes the absorption of the characteristic wavelength of the fuel, which reduces saturation, making it difficult to express clear and vivid colors.

When looking at the impurities present on the yarn surface, there are firstly oils and oligomers attached in the weaving process, weight loss residues attached in the weaving process and weight loss process, and oligomers that precipitate from the inside of the yarn in the dyeing process. In addition, there are dusts and greases that stick to the process of transferring or storing yarn or forge.

Of course, before the dyeing process, there is a refining process to remove these impurities, but the microfiber itself has a wide surface area, so it is easy to attach dust or oil, and the attached impurities do not fall well. Due to the use of large amounts of emulsions and emulsions, it is difficult to remove them sufficiently. And there is no means to solve the weight loss generated in the weight loss process after the refining process or oligomers precipitated in the dyeing process.

One method is to wash at high temperature after dyeing. At this time, some of the dyes adsorbed on the fiber are pulled out together, which leads to a severe reduction in color density, and additional processing adds additional processing costs.

Therefore, the practical trend is to weaken or omit the cleaning conditions. In addition, microfiber yarns have a wide surface, so that the adsorption rate of dyes is high and the bonding force with dyes is high, making it difficult to move dyes once attached to fibers. Therefore, when disproportionate occurs in the early stage of dyeing, it is not easily corrected, and it is easy to remain as stain even after dyeing is finished.

The present invention is characterized in that the dyeing in an alkali bath to solve this problem.

Dyeing in alkaline bath can effectively remove impurities such as emulsion, glue, dust, grease and oligomers or weight residues attached to the fiber surface due to its excellent refining effect. The dye can be removed, making the color of the label vivid and bright. And it has a function to prevent dye stains by improving the dyeing power of the dye in the salt bath.

Hereinafter, the present invention will be described in detail.

In the present invention, the dyeing is performed under alkaline conditions, so that the pH range can be optimally adjusted to achieve an excellent effect without decomposing the used dye.

In general, refining is performed under alkaline conditions because various impurities such as emulsions, oils, oils, etc. present on the paper are easily eliminated under alkaline conditions rather than acid conditions. In addition, weight loss residues generated after weight loss and oligomers generated in the dyeing process are known to have high solubility under alkaline conditions. Therefore, it may be better to dye under strong alkali conditions, but the stability of dyes will arise.

Generally, when dyeing a fiber containing polyester, a disperse dye is used, the disperse dye is characterized in that decomposition occurs under alkaline conditions.

Therefore, the conventional dyeing in weak acidic conditions, because the dispersion dyes are highly stable in the acidic bath. However, many of the dyes do not decompose under the harshest alkali conditions and exhibit stable dyeing properties similar to the existing acid conditions. Therefore, when dyeing under a specific range of alkali conditions, it is possible to obtain the effects of alkali dyeing as mentioned above while obtaining a rate of absorption of dyes similar to conventional acid dyeing. As the alkalinity is increased, the effect of removing impurities and the homogeneity of dye are improved, but at the same time, the decomposition of dye is promoted, so the present invention has optimized the pH of the salt bath in consideration of two relationships. In other words, since the effect of alkali on the dye decomposition is small in the early low temperature part of the dyeing process, the pH of the salt bath is increased to enhance the refining effect. The dye remained stable while being sufficiently removed. For this purpose, it is necessary to fully understand the characteristics of the alkali preparations used in the dyeing and to finely control the amount used.

During the dyeing process, the pH should be adjusted to fall within a certain range.

In the present invention, various alkali preparations were tested, and the satisfactory effect was obtained by adjusting the initial pH range of the salt bath to be in the range of 9.5 to 11.5 and the final pH to 7.0 to 9.5. Alkali adjuvants to be used also have an effective effect of adjusting the pH of the alkali, but even if a caustic soda or sodium borate is used, it is possible to maintain an appropriate pH range by adjusting the amount of the alkali. It is difficult to define the pH of the salt bath uniformly because the pH of the salt bath also varies according to the type of forge, the dye used, and the amount of emulsions, agents, oligomers, and other impurities attached to the forge. It is important to adjust within one range.

In addition, the effect of the present invention is exhibited to some extent in general yarns, but the difference does not appear well, and the smaller the fineness of the fiber, that is, the effect is increased significantly toward the microfiber.

Hereinafter, the effects of the present invention will be described through Examples and Comparative Examples.

Example 1

Weaving fabrics using polyester yarns (75 denier / 36 filaments) as warp yarns and weaving yarns using split microfiber yarns (130 denier / 48 filaments, 65% polyester, 35% nylon) composed of nylon and polyester as weft yarns After the refinement, reduction, and pre-set (pre-set) by the method of dividing through the weight loss process. After dividing, the fineness was 0.1-0.3 denier. The dyeing was done using a liquid dyeing machine, and the ratio of the salt solution was 1:30. The dye was used C.I. DISPERSE BLUE 56 DMF 2.0% (owf).

Dyeing was carried out in a dyeing aeration at room temperature and then in the order of leveling agents, alkali preparations, dyes while rotating the salt.

Caustic soda was added at 0.13 g / l and the pH was adjusted to 11.2. After dye injection, the temperature was raised to 130 ° C with a heating rate of 1.0 ° C / min. After dyeing at this temperature for 60 minutes, the pH was measured and the pH was 9.4. This is because the pH decreases due to the reaction between the oligomer and alkali).

Example 2

After extraction, weaving was carried out using an inclined extraction type microfiber (120 denier / 35 filaments) leaving only polyester components and a twist of 2,000 T / M polyester yarn (75 denier / 36 filaments).

After the refining, reduction, preliminary set in a conventional manner and then reduced alkali. After the weight loss, single yarn fineness was 0.1 denier.

Staining was carried out in the same manner as in Example 1.

Example 3

The warp yarns were woven, woven, and reduced in the usual way using a conventional biaxial blend fiber (75 denier / 48 filament) and a weaving yarn made of polyester yarn (75 denier / 72 filament).

Example 4

The fabric using the general polyester yarn (75 denier / 36 filament) as a light and weft was treated in the same manner as in Example 1.

Comparative Example 1

In Example 1, 0.3 g / l of acetic acid was added in the conventional manner without alkali preparation, and dyeing was performed under acidic conditions.

Comparative Example 2

In Example 2, 0.3 g / l of acetic acid was added in the conventional manner without using an alkali preparation, and dyeing was performed under acidic conditions.

Comparative Example 3

In Example 3, 0.3 g / l of acetic acid was added in the conventional manner without using an alkali preparation, and dyeing was performed under acidic conditions.

Comparative Example 4

In Example 1, dyeing was performed in a neutral bath without using an acid and an alkali aid.

Comparative Example 5

In Example 1, 0.01 g / l of caustic soda and 0.1 g / l of soduborate were added as an alkali adjuvant.

The results of the tests through the examples and the comparative examples are shown in the following table.

* K / S and C values are measured by using MM8000, SPECTROPHOTOMETER SYSTEM of ICS (INSTRUMENTAL COLOR SYSTEM).

* The pH value was measured using 720A TYPE pH METER manufactured by ORION.

* ◎: The appearance of dyed stain does not appear in appearance

(Circle): The state in which the stain stain was not transmitted by appearance.

△: appearance of slightly dyed stain

X: The appearance of dyed stains not severely observed

Claims (2)

In dyeing the forge composed of general polyester yarn and polyester microfiber using disperse dye, dyeing by adjusting the initial pH of dyeing bath in the range of 9.5 ~ 11.5 and end pH in the range of 7.0 ~ 9.5 Dyeing method of polyester forge, characterized in that. The dyeing method of polyester forge according to claim 1, wherein the alkali adjuvant is caustic soda or sodium borate.