KR101577046B1 - Method for Dyeing Complex Material Fabric Composed of Polyamide and Polyester - Google Patents

Abstract

Disclosed is a method for dyeing a composite material fabric made of a polyamide fiber and a polyester fiber with a disperse dye, performing a reduction washing and dyeing with an acid dye, so that the disperse dye dyed on the polyamide fiber is sufficiently decolorized, The present invention relates to a dyeing method in which dyeing has coloring and coloring properties.
The dyeing method of the polyamide-polyester composite material according to the present invention is characterized in that the dye is dyed with a three primary color disperse dye and then washed with a thiourea reducing detergent effective for discoloration of the disperse dye, The dyeing of the polyamide fibers by the acid dyes exhibits high coloration and deep coloring, and enables composite fabric dying excellent in fastness and uniformity throughout the fabric.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of dyeing a polyamide-polyester composite material,

Disclosed is a method for dyeing a composite material fabric made of a polyamide fiber and a polyester fiber with a disperse dye, performing a reduction washing and dyeing with an acid dye, so that the disperse dye dyed on the polyamide fiber is sufficiently decolorized, The present invention relates to a dyeing method in which dyeing has coloring and coloring properties.

Composite materials made of multiple fibers are widely used in functional clothes such as health clothing, sweat absorbent, quick drying, and cold feeling clothes.

A composite material is a fiber material made by combining two or more materials in a yarn (composite yarn, blend, etc.) or in a fabric (such as a woven fabric, a knit fabric, or a composite fabric). Such a composite material compensates for defects A new texture and color can be obtained and the effect of lowering the unit price of the product can be obtained.

Among these composite materials of various kinds of fibers, N / P (NYLON / PET) composite fiber material composed of polyamide and polyester is widely used for clothing and interior due to its unique touch and hygroscopicity. Recently, It is widely used because of its hygroscopicity due to unique capillary phenomenon due to flammability and twisting, and high-speed drying property and antibacterial property through the advantage of scrubbing utilizing triangular cross-sectional structure and synthetic fiber.

The advantages of polyamide are excellent elasticity, texture and color developability. Polyester is inexpensive and excellent in properties. In the case of N / P composite fiber materials, especially velvet, elasticity and touch of polyamide, It is widely used because of its excellent physical properties.

In the field of dyeing and processing, the quality and value of these composite materials are improved through the dyeing of these composite materials. The dyeing of ordinary polyamide-polyester composite materials is carried out by using a mixed dye of disperse dye or disperse dye and acid dye, Or 2 bath method.

Conventional methods for dyeing polyamide-polyester conjugated fibers have been proposed. For example, a method of simultaneously dyeing polyester and polyamide with a disperse dye is a method of dyeing two colors due to a difference in dyeability between a polyester and a polyamide And the dyeing fastness is poor. In addition, there is a disadvantage in that stability of the process is deteriorated due to a large color change during reduction cleaning.

As another method, there is a method of staining an ionic dye by dyeing with a disperse dye, then adding a reducing cleaning aid and an ionic dye at the same time for reducing washing, and adjusting the pH in the dyeing machine without cooling.

This method solves the problem of dichroism and dye fastness, and the dyeing time is slightly longer than the ordinary dispersion dyeing method in which the dyeing time is also reduced. However, after the dispersion dyeing is performed under acidic conditions, the dye is subjected to reduction washing under alkaline conditions, To adjust the pH so that color irregularity is liable to occur when dyed with an ionic dye.

The N / P composite fiber material is conventionally dyed polyester fiber with a disperse dye and then reduced and washed to remove the disperse dye contamination contaminated with the polyamide fiber. Then, the polyamide fiber is dyed with an acid dye, (soaping), and the staining is completed.

However, the N / P composite material has poor color fastness and fastness due to the difference in the dyeing mechanism of the two components, and even if some of the polyamide side is also dyed on the principle of dyeing of the disperse dye, the contamination on the polyamide side is not completely removed, It is difficult to obtain the resultant color after dyeing, and there is a fundamental problem that the disperse dye dyed in the polyester material is dropped from the polyester material during the dyeing of the polyamide material and is adsorbed and contaminated with the polyamide material.

As a result, N / P composite materials, especially velvet burn-out materials, are only dyed polyester, which is the fur part of the surface, while the polyamide side, which is the base part, It is a very difficult task to obtain a heart with excellent fastness by dyeing by topping.

In order to solve such a problem, Korean Patent Laid-Open Publication No. 10-2005-0108507 discloses a composite yarn composed mainly of polyamide and polyester at room temperature dyed polyterephthalate fibers. Acid dyes dyeing polyamides have a high affinity with polyamide fibers while dispersible dyes dyeing polyesters have a high affinity with polyester fibers. It is possible to manufacture a composite of highly chromatic complexes having a higher degree of fastness than the N / P composite yarn of the present invention.

However, since the polyester material of the composite yarn is limited to a material having a dyeable temperature similar to that of polyamide, and the acid dye and the disperse dye are also limited to those having a high affinity between the polyamide and the polyester material, The color fastness and the color fastness of the fiber can be increased to some extent, but the range to which the above method can be applied is limited to a certain level.

In addition, Korean Patent Laid-Open Publication No. 10-2000-0042619 discloses a polyamide-polyester composite yarn in which caustic soda and 4-aminobenzoic acid ethyl ester are added to a salt bath, the mixture is warmed up and the dye is dyed by a one- The 4-aminobenzoic acid ethyl ester used in the present invention releases the acidic substance as the temperature of the salt bath rises and moves the pH of the salt bath toward the acidic side to prevent the decomposition of the disperse dye , Since there is no decomposition of the disperse dyes during dyeing, it is possible to obtain dyeings having excellent color density and wash fastness comparable to the two-dye dyeing method.

In addition, Korean Patent Laid-Open Publication No. 10-1993-0013362 discloses a method in which a disperse dye, a dispersant, and a bat dye are added to a dyeing machine, heated and leveled, cooled, charged with caustic soda and a reducing agent, A dyeing method of a polyester-polyamide composite fiber has been proposed, which has the advantage of simplifying the process and shortening the process time.

However, the above-mentioned inventions are difficult to apply to the dyeing industry in reality, except for high-value-added products, because it is difficult to improve the smoothness, the improvement of the stain and the correction of the color.

Korean Patent Registration No. 10-0211455 discloses a technique for easily producing a dark black color by adding a black pigment to a polyester component in the splittable polyester / polyamide conjugated fiber, The black color is added to the colorant, and it is already gray, so that it is difficult to give various colors, and there is a problem that the abrasion of the machine and the contamination of the fabric occur due to dropout of the added pigment.

As described above, there is a need to develop an economical dyeing method capable of obtaining high-quality dyes having high color fastness while exhibiting excellent color in dyeing different kinds of N / P composite materials.

The problem to be solved by the present invention is to dye a composite fiber fabric made of polyamide fibers and polyester fibers with polyester fibers with disperse dyes and remove the disperse dyes dyed on the polyamide fibers through reduction washing to obtain polyamide fibers The present invention is to provide a method capable of decolorizing a disperse dye dyed on a polyamide fiber as much as possible during a reduction washing process so that the dyeing of the polyamide fiber can exhibit a clear color in the dyeing process.

Disclosure of the Invention In order to solve the above-mentioned problems, the present invention provides a method for preparing a dye-dispersed dye solution, comprising: preparing a disperse dye salt solution by mixing an E-type red disperse dye and a yellow disperse dye and an S- Dyeing a composite material fabric composed of polyamide fibers and polyester fibers at 115 to 135 ° C for 20 to 50 minutes with the disperse dye salt solution; The composite fabric dyed with the disperse dye was subjected to primary reduction-washing at 90 to 100 ° C in an aqueous 8 to 25% (owf) thiourea solution of pH 7 to 11, followed by secondary reduction-washing at 100 to 110 ° C, 40 minutes; Dyeing the composite washed fabric with the acid dye solution at 85 to 100 DEG C for 15 to 40 minutes; And washing the composite fabric dyed with the acid dye. The present invention also provides a method for dyeing a polyamide-polyester composite fabric.

At this time, it is preferable that the disperse dye salt solution contains the disperse dye in a proportion of 1.5 to 3.0% (o.w.f) of the composite material, and the disperse dye preferably further contains 0.5 to 3.0 g / ℓ (o.w.s) of dispersant.

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The pH of the disperse dye salt solution and acid dye salt solution is preferably 4 to 7.

The dyeing method of the polyamide-polyester composite material according to the present invention is characterized in that the dye is dyed with a three primary color disperse dye and then washed with a thiourea reducing detergent effective for discoloration of the disperse dye, The dyeing of the polyamide fibers by the acid dyes exhibits high coloration and deep coloring, and enables composite fabric dying excellent in fastness and uniformity throughout the fabric.

1 is a photograph of a polyamide-polyester composite material fabric dyed by the dyeing method according to the present invention.
2 is another photograph of a composite fabric fabric dyed by the dyeing method according to the present invention.
3 is a photograph of a composite fabric fabric dyed with a monochromatic disperse dye instead of the three-color dispersion dye.
FIG. 4 is a photograph of a composite material fabric in which the type of the three-color dispersion dye is dyed in accordance with the dyeing method of the present invention.

The composite material fabric of the present invention is a composite fiber fabric made of polyamide fibers and polyester fibers, and may be a fabric, a knitted fabric, a nonwoven fabric, or various other forms. The composite material may be burnt out processed And it is more preferable to use a material having a burnout process in terms of expressing the shape, texture and aesthetics of the dyed composite material in a more luxurious and clear manner.

The dyeing method of the composite material fabric includes dyeing the polyester fiber with the disperse dye, and removing the disperse dye and the unnatural dye dyed in the polyamide fiber through reduction washing and dyeing the polyamide fiber with the acid dye.

However, in the dyeing process of polyester fibers, the disperse dyes are partially dyed not only in the polyester fibers but also in the polyamide fibers. If the dyed components of the polyamide fibers are not completely removed during the reduction washing, the dyeing of the polyamide fibers by the acid dyes is not clear It is also difficult to obtain the desired color.

In order to solve this problem, in the present invention, the dye components dyed on the polyamide fiber during the dyeing process of the polyester fiber with the disperse dye are discolored as much as possible during the reduction washing process, and then dyed with the acid dye, It is possible to dye with high fastness.

Disperse dyes for dyeing polyester fibers are crystalline materials having a high melting point and are derivatives such as azo or anthraquinone having a small molecular weight. They form stable dispersions in a salt bath by dispersing agents, and aromatic or aliphatic amine groups (-NH ₂ ) and hydroxyl group (-OH) and does not involve any chemical change during dyeing. The azo dye (azo dye) for polyester fibers, which does not contain an arylamine component known as a carcinogen, Dyes are preferred.

Polyester fibers are generally referred to as polyethylene terephthalate (PET) fibers. There are no hydrophilic groups other than the ester group, carboxyl group and hydroxyl group at the terminal, It is difficult to dye the dyes other than the disperse dye and the azo dye.

Disperse dyes are water-insoluble dyes that disperse insoluble particulate dyes in solvents and penetrate into hydrophobic fibers such as polyester fibers and acetate fibers to dye them. Their color is beautiful, have.

Polyester fibers have to be dyed at a high temperature due to their high hydrophobicity and crystallinity, and conventionally, a method of raising the temperature to a high temperature of about 130 DEG C in a dispersion of disperse dyes and sucking dyes for 1 to 1.5 hours has been used.

However, since the disperse dye has a high transferring property at a high temperature, it is easy to obtain a leveling dye. However, due to the high dye transferability, the dye is partially dyed not only in the polyester fiber but also in the polyamide fiber of the composite material. Disperse dyes are largely removed during reduction washing, but some remain depending on the disperse dyes and inhibit the coloring of polyamide fibers by acid dye dyeing.

Therefore, in order to obtain high-quality dyed articles having high color fastness while exhibiting excellent color in dyeing of a hybrid N / P composite of polyamide and polyester, dispersion dispersed in the polyamide without affecting the dyeing of the polyester fiber It is necessary to remove the dye as much as possible. For this purpose, it is important to select a disperse dye and to select a reducing detergent to remove the disperse dye dyed on the polyamide.

Since the dye fastness of the disperse dye is higher than that of the three primary colors, monochromatic dyes (black, navy blue, etc.) are used in the present invention in order to induce discoloration of the polyamides. It can be easily removed from the polyamide by reduction washing because the decomposition occurs more easily in the alkaline environment than in the navy blue color.

Dispersion dyes of yellow, red, and blue in the three primary colors are poor in sharpness and in dye fastness to synthetic fibers. In order to solve such problems, E-type disperse dyes are used for the red and yellow colors of the three primary colors, and S-type disperse dyes are used for the blue colors.

Disperse dyes can be classified into E-type, SE-type and S-type based on sublimation fastness. E-type disperse dyes have a small dye particle size, fast dyeing rate and excellent homogeneity, The dispersibility of S-type disperse dyes is higher than that of S-type disperse dyes because of the large size of dye particles, the slow rate of dyeing and the fastness to sublimation of 4 ~ 5. SE-type disperse dyes have intermediate properties between E-type and S-type disperse dyes.

In addition, in the early stage of dyeing, the E-type disperse dye having a small size of the dye penetrates into the fiber first, but the S-type disperse dye having strong affinity to the polyester fiber tends to be dyed while pushing the E-type disperse dye have.

Therefore, yellow and red dyes excellent in dye fastness are dyed with high color fastness of yellow and red dyes by using E-type dispersion dye having excellent uniformity and low sublimation fastness, And can be easily removed from the polyamide by the low sublimation fastness of the E-type disperse dye.

On the other hand, the use of S-type disperse dyes having a high dye fastness to dyeing has a high sublimation fastness, so that dyeing of high-temperature disperse dyes is strongly stained to polyester fibers due to high sublimation fastness of S- And can be easily removed from the polyamide by the low dye fastness of the blue dye.

After mixing the disperse dye of the above type with water to prepare a disperse dye salt solution, the composite fabric is dyed at a high temperature of 115 to 135 ° C for 20 to 50 minutes to sufficiently penetrate the disperse dye into the loosened fiber It is appropriate that the disperse dye is used in a concentration of 1.5 ~ 3.0% owf (on the weight of fiber) while allowing the E-type disperse dye and the S-type disperse dye to be well-balanced.

If the dyeing temperature is less than 115 ° C or the dyeing time is less than 20 minutes, the dyeing power of the disperse dye to the polyester fiber is insufficient and if the dyeing temperature exceeds 135 ° C, the dyeing of the disperse dye to the polyamide fiber is too strong, And when the dyeing time exceeds 50 minutes, the S-type disperse dye pushes away the E-type disperse dye dyed on the polyester fiber, resulting in uneven color.

Also, if the pH changes from neutral to basic during dyeing, hydrolysis of the dye causes discoloration, which causes defects such as decrease in salt loading and fastness. Therefore, the pH of the disperse dye salt solution is adjusted to 4 to 7 by adding acetic acid or the like .

The disperse dye salt solution may further include a dispersing agent for the purpose of uniformly dispersing the disperse dye in a salt solution to improve uniformity, and may be a conventional dispersing agent for a disperse dye, and may be an anionic or nonionic dispersing agent. Lignin-based or naphthalene-based ones such as naphthalene sulfate may be used, and the dispersing agent may be contained in the disperse dye salt liquid in an amount of 0.5 to 3.0 g / l (ows).

Next, composite fabric dyed with disperse dyes is reduced and washed to decolorize the disperse dyes dyed on polyamide fibers. As a reducing detergent for disperse dyes, hydrosulfite, which is usually dissolved in water and exhibits strong reducing power, is mainly used However, the hydrosulfite has a property of decomposing in the acid, so it contacts with the composite material dyed under the acidic condition and generates sulfurous acid gas, which seriously affects the human body.

In the present invention, thiourea is used as a reducing cleaning agent. Thiourea is a colorless crystal. Since the aqueous solution is neutral and has a reducing ability superior to that of hydrous sulfite, it is excellent in discoloration of the three primary color disperse dyes dyed on the polyamide fiber Performance.

The reducing cleaning liquid is prepared by mixing 8-25% owf of thiourea with respect to the weight of the fabric, and the N / P composite fabric dyed with the dispersion dye is reduced and washed with the reducing cleaning solution at 90-110 ° C for 25-40 minutes The disperse dye dyed on the polyamide fiber is discolored.

At this time, as the reduction cleaning temperature is elevated, a part of the disperse dye dyed in the polyester fiber is thermo-bleached again to the fiber surface, causing a migration to contaminate the polyamide fiber, And the friction fastness may be lowered.

As a method for preventing this, it is preferable to firstly perform primary reduction washing at 90-100 ° C, which is a low temperature range within the reduction cleaning temperature range, to remove the disperse dye dyed on the polyamide fiber while suppressing the early thermobleaching phenomenon, It is preferable to remove the residual disperse dye by performing secondary reduction washing at 100-110 ° C which is a high temperature range within the reduction washing temperature range in view of suppressing the influence on the dye dyed on the polyester fiber.

In addition, since the three-color dye is easily decomposed in an alkaline environment and the S-type blue dye having a high sublimation fastness is likely to decompose at a high pH, it is necessary to adjust the reducing cleaning liquid to alkaline. To this end, sodium hydroxide the pH of the reducing cleaning liquid is adjusted to 7 to 11 by adding sodium hydroxide, sodium hydrogen carbonate, sodium carbonate, or the like, so that discoloration from the polyamide can be easily performed.

Next, the composite washed fabric is dyed with an acid dye at 85 to 100 ° C for 15 to 40 minutes to dye the polyamide fibers in the composite material.

Polyamide fibers are represented by nylon, which is obtained by polymerizing caprolactam and repeating an amide bond (-NHCO-) in the molecular structure and having an amine group (-NH ₂ ), a carboxyl group (-COOH) It is similar to that of protein fiber such as silk and wool, but it has higher hydrophobicity than protein fiber because it has many methylene groups (-CH ₂ -) and less salt capillary excitation. It has excellent elasticity and color development It is used for various applications and industrial applications.

At present, industrial polyamide fibers are mainly dyed with acid dyes in consideration of dyeability, fastness, coloring property and processability. As acid dyes, azo based acid dyes, polyazo based acid dyes, anthraquinone based acid Dyes, metal acid dyes and acid mordant dyes are used. The pH of the acid dye solution is adjusted to about 4 to 7, and the large fiber weight of the acid dye is preferably 1 to 3% owf.

Once the dyeing of the acidic dye is completed, the dyed composite fabric is washed with water 1 to 3 times to remove the remaining salt solution, and if necessary, the soaping process is performed before the wash to completely remove the residual salt solution.

Hereinafter, the present invention will be described in more detail with reference to the following examples, comparative examples and test examples.

It is to be understood, however, that the invention is not to be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Will be apparent to those skilled in the art to which the present invention pertains.

≪ Example 1 >

30 g of an E-type red disperse dye (CI No. Violet 33) having a sublimation fastness second class, 80 g of a yellow disperse dye (CI No. Orange 25) and an S-type blue disperse dye having a sublimation fastness class 5 79) and 15 g of lignin sulfate as a dispersant were mixed with 10 kg of water, and acetic acid was added to adjust the pH to 5.5, thereby preparing a disperse dye salt solution of three primary colors.

10 kg of composite fabric (Mow: polyethylene terephthalate fiber, base: nylon fiber) composed of composite fiber material of nylon fiber and polyethylene terephthalate fiber and patterned by burnout processing, and the disperse dye salt solution are put into dyeing machine The mixture was stirred at 120 ° C for 30 minutes, and the waste liquid of the disperse dye salt solution was discharged.

1.6 kg of thiourea was mixed with 10 kg of water and sodium carbonate was added thereto to adjust the pH to 9, and the reducing washing liquid was added to the dyeing machine and subjected to reduction washing at 100 DEG C for 30 minutes to remove the disperse dye dyed on the nylon fiber. The waste liquid of the reducing cleaning liquid was discharged.

Next, 200 g of the azo-based acid dye was mixed with 10 kg of water to prepare an acidic dye salt solution having a pH of 6, which was then added to the dyeing machine, dyed at 95 ° C for 25 minutes, and the waste solution of the acidic dye salt solution was discharged.

10 kg of water, 10 g of an anionic soap and 10 g of sodium hydroxide were added to the dyeing machine for 20 minutes, followed by draining of the water for 20 minutes. Subsequently, water was added to the dyeing machine for a further 10 minutes, The dyestuff and the reducing cleaning liquid were cleanly removed from the fabric, and then the composite material fabric was dyed and dried (see Fig. 1).

≪ Example 2 >

In Example 1, a reducing cleaning liquid was added to a composite material dyed with a disperse dye, followed by reduction washing at 95 ° C for 20 minutes in a dyeing machine, followed by reduction washing at 105 ° C for 10 minutes to remove the disperse dye dyed on the polyamide fiber , A composite material was dyed in the same manner as in Example 1 above.

At this time, various other colors were used as acidic dyes (see FIG. 2).

≪ Comparative Example 1 &

A composite material fabric was prepared in the same manner as in Example 1, except that 200 g of a monochromatic dispersion dye of black color was used instead of the red, yellow and blue three-color dispersion dyes as the dispersion dye in Example 1 (See Fig. 3).

≪ Comparative Example 2 &

In Example 1, except for using an S-type disperse dye having a sublimation fastness grade of 5 and a blue disperse dye having an E-type disperse dye having a sublimation fastness level of 2 as the red disperse dye and the yellow disperse dye, Composite fabrics were dyed in the same manner as in Example 1 (see Fig. 4).

≪ Test Example 1 >

Washing, friction, water, and dry cleaning (solvent: perchlorethylene) fastness of the composite fabric dyed in Examples 1 and 2 and Comparative Examples 1 and 2 were measured and are shown in Table 1 below.

Five samples were taken from each group, and the range of the measured values was indicated.

Fastness measurement result (unit: grade) Wash fastness Friction fastness
(dry) Water fastness
(staining) Dry cleaning
Staining Example 1 4 4 4 4 to 5 Example 2 4 to 5 4 4 to 5 4 to 5 Comparative Example 1 4 to 5 4 to 5 4 to 5 4 to 5 Comparative Example 2 3 to 4 3 to 4 2 to 3 3 Test Methods KS K 0430 KS K 0650 KS K ISO 150-E01 KS K ISO 105-D01

The results of Table 1 show that both Example and Comparative Example 1 showed a good state at a level of 4 or higher. However, S-type disperse dyes were used as red and yellow disperse dyes and E-type disperse dyes were used as blue disperse dyes In Comparative Example 2, it was confirmed that the fastness was lowered, and in particular, the water fastness was poor.

It is considered that the fastness of the blue disperse dye with low dye fastness is lowered by the E-type blue disperse dye by using E-type having low sublimation fastness.

≪ Test Example 2 >

In the above Examples and Comparative Examples, the composite material fabric subjected to reduction-cleansing before dyeing with acidic dyes was taken and the apparent color density (K / S color density) of the nylon fiber as the base portion was measured and shown in Table 2 below.

For the measurement, the reflectance was measured five times at the maximum absorption wavelength in the visible light region using a Computer Color Matching System (model Match Scan2, Diano, USA) at the base of the composite composite fabric subjected to reduction cleaning, The K / S value was obtained by the Munk equation.

The Kubelka-Munk equation is shown below and the K / S value is proportional to the dye concentration of the fiber.

K / S = (1-R) ² / 2R

K: extinction coefficient

S: laying number

R: spectral reflectance

Reduction cleaning effect measurement result K / S color density Example 1 0.55 Example 2 0.42 Comparative Example 1 1.23 Comparative Example 2 0.78

In Table 2, it can be seen that the K / S color density was measured to be very small in Examples of the present invention, and most of the disperse dyes dyed on the nylon fiber by the reduction washing were removed, and in particular, From the smallest measured value of Example 2 subjected to reduction washing, it was washed first at a low temperature during the reduction washing to remove the disperse dye of the nylon fiber while suppressing the desorption of the disperse dye from the polyethylene terephthalate fiber, It can be seen that it is more effective to remove the above.

In the case of Comparative Example 1, by using a monochromatic dispersion dye of black color having a high dye fastness in place of the three-color dispersion dye, it can be said that dyeing of the polyethylene terephthalate fiber is advantageous but disadvantageous in the discoloration of the nylon fiber.

Further, in Comparative Example 2, it was found that a large amount of red and yellow disperse dyes remained in the nylon fiber after the reduction washing, by using S-type red and yellow dispersion dyes having high dye fastness and high sublimation fastness.

≪ Test Example 3 >

The uniformity of the dyed composite fabrics of the above Examples and Comparative Examples was analyzed and shown in Table 3. The measurement was carried out by separating the polyethylene terephthalate fiber as the core portion and the nylon fiber as the base portion, And the standard deviations were calculated.

Results of homogeneity analysis standard deviation of ΔE Polyethylene terephthalate fiber Nylon fiber Example 1 0.53 0.41 Example 2 0.50 0.36 Comparative Example 1 0.46 0.65 Comparative Example 2 0.72 0.70

In the polyethylene terephthalate fiber as a mother portion, the uniformity of Comparative Example 1 using a monochromatic disperse dye of black color instead of the three primary color dispersing dyestuff was the most excellent, and the color deviation was smaller in monochromatic color than in the three primary color.

The reason why the standard deviation was large in Comparative Example 2 is that the color fastness of each color is increased because the fastness of each color can not be balanced with respect to the result of Test Example 1.

That is, when S-type red and yellow disperse dyes having a high dye fastness and high fastness to sublimation and an E-type blue disperse dye having low dye fastness and low sublimation fastness are different, fastness of each color is large, This seems to be uneven.

As can be seen from the results of Test Example 2, the monochromatic disperse dye having a high dye fastness was observed in the reduction washing process It was not discolored and remained from the nylon fiber, resulting in non-uniform dyeing of the acidic dye and inhibition of color development.

As described above, the dyeing method of the polyamide-polyester composite material according to the present invention is characterized in that after dyeing with a disperse dye of three primary colors and washing with a thiourea reducing detergent effective for discoloration of the disperse dye, Dyestuffs are discolored as much as possible, and dyeing of acidic dyestuffs on polyamide fibers has high coloration and shading, and enables dyeing composite fabrics excellent in fastness and evenness.

Claims (7)

Preparing a disperse dye salt solution by mixing E-type red disperse dye and yellow disperse dye and S-type blue disperse dye with water;
Dyeing a composite material fabric composed of polyamide fibers and polyester fibers at 115 to 135 ° C for 20 to 50 minutes with the disperse dye salt solution;
The composite fabric dyed with the disperse dye was subjected to primary reduction-washing at 90 to 100 ° C in an aqueous 8 to 25% (owf) thiourea solution of pH 7 to 11, followed by secondary reduction-washing at 100 to 110 ° C, 40 minutes;
Dyeing the composite washed fabric with the acid dye solution at 85 to 100 DEG C for 15 to 40 minutes; And
Washing the composite fabric dyed with the acid dye. ≪ RTI ID = 0.0 > 11. < / RTI > The method according to claim 1,
Wherein the disperse dye salt solution comprises the disperse dye in an amount of 1.5 to 3.0% (owf) of the composite fabric. The method according to claim 1,
Wherein the pH of the disperse dye salt solution is in the range of 4 to 7. The dyeing method of the polyamide-polyester composite material according to claim 1, The method according to claim 1,
Wherein the disperse dye salt solution further comprises 0.5 to 3.0 g / l (ows) of a dispersing agent. delete delete The method according to claim 1,
Wherein the acidic dye salt solution has a pH of 4 to 7. 6. A method for dyeing a polyamide-polyester composite material fabric,

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