JP2000080575A - Dyeing of sheath-core type conjugated fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excellent dyeing process for a sheath-core type conjugated fiber that can uniformly dye the sheath-core type conjugated fiber without striated unevenness. SOLUTION: In the dyeing of a sheath-core type conjugated fiber, a polyamide modified with a sulfonated aromatic dicarboxylic acid is formulated to the sheath part at a formulation ratio of 25-75 wt.%, while a polyester modified with a sulfonated aromatic dicarboxylic acid is formulated to the core part and the resultant conjugated fiber is dyed by using a level dyeing agent and substantially a cationic dye.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dyeing method for uniformly dyeing core-sheath composite fibers with only a cationic dye.

[0002]

2. Description of the Related Art A sulfonated aromatic dicarboxylic acid-modified polyamide is disposed in a sheath portion (composite ratio: 25 to 75% by weight), and a sulfonated aromatic dicarboxylic acid-modified polyester is disposed in a core portion (composite ratio: 75 to 25% by weight). When the core-sheath composite fiber is dyed only with a cationic dye, the fiber length is determined by a difference in the thermal history of the sheath polyamide, stretching, the number of amino terminal groups, etc., as an alienation factor of the leveling property of the core-sheath composite fiber. Streak-like unevenness occurred in the direction. Therefore, in order to uniformly dye the core-sheath type composite fiber, the core polyester and the sheath polyamide are dyed in the same color. However, when the sheath polyamide is dyed, the light fastness and the like are worse than when the core polyester is dyed only with the cationic dye, and the process is longer due to the use of an acid dye or a treating agent, and the cost is higher. In fact, the core-sheath conjugate fiber does not take advantage of the features of high color developing property and high fastness property.

[0003]

DISCLOSURE OF THE INVENTION In view of the background of the prior art, the present invention provides an excellent method for dyeing a core-sheath composite fiber which can be uniformly dyed without streak-like unevenness. Things.

[0004]

The present invention employs the following means in order to solve the above problems. That is, the dyeing method of the core-sheath type conjugate fiber of the present invention uses a sulfonated aromatic dicarboxylic acid-modified polyamide with a composite ratio of 25 to 25.
75% by weight of a core-sheath type conjugate fiber comprising a core and a sulfonated aromatic dicarboxylic acid-modified polyester disposed in a sheath, wherein the core and the leveling agent are substantially cationic dyed. And dyeing using the following.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention has been studied diligently for the above-mentioned problem, that is, a dyeing method capable of uniformly dyeing such a specific core-sheath type conjugate fiber without streak-like unevenness.
When dyeing was carried out using a leveling agent for the core polymer and a cationic dye, it was surprisingly found that this problem was solved at once. That is, it has been found that the core can be uniformly dyed without unevenness only by dyeing the core with a cationic dye together with the leveling agent.

The leveling agent preferentially removes the leveling alienation factors of the core-sheath type composite fiber such as the heat history of the polyamide in the sheath, the stretching and the number of amino terminal groups before dyeing. Or it has a function that can make it uniform.
As the leveling agent, a surfactant is effective, and among them, at least one selected from nonionic surfactants and anionic surfactants, and of course, a mixture thereof is preferably used. As such a nonionic surfactant, a nitrogen-containing nonionic surfactant is preferable, and as the anionic surfactant, a sulfonate-type anionic surfactant is preferably used.

[0007] Among such nonionic surfactants, ie, nitrogen-containing nonionic surfactants, at least one selected from fatty acid alkanolamides, polyoxyethylene fatty acid amides, alkanolamine esters, polyoxyethylene alkylamines and amine oxides Are preferably used, specifically, coconut fatty acid diethanolamide, polyoxyethylene stearamide, polyoxyethylene oleic amide, polyoxyethylene capric amide, polyoxyethylene mystyramide, polyoxyethylene stearylamine , Polyoxyethylene oleylamine, dimethyllaurylamine oxide, bis (2-hydroxyethyl) laurylamine oxide and the like can be used.

Anionic surfactants, ie, sulfonate type anionic surfactants, include alkyl sulfonates, sulfosuccinates, ester sulfonates, and the like.
At least one selected from alkyl allyl and alkyl naphthalene sulfonates and N-acyl sulfonates;
Species are preferably used, and specifically, sodium dodecanesulfonate, sodium tridecanesulfonate, sodium heptadecanesulfonate, sodium di-2-ethylhexyl sulfosuccinate, sodium lauryl sulfoacetate, sodium α-olefin sulfonate, dodecylbenzene Sodium sulfonate and the like can be used.

In the present invention, such a surfactant may be subjected to pretreatment by padding or immersion, simultaneous treatment in a dye bath, or both. That is, by dyeing the core of the core-sheath composite fiber only with a cationic dye, the core-sheath composite fiber (fabric) having excellent leveling properties can be obtained. This means that the leveling agent preferentially covers leveling alienation factors, such as the thermal history, stretching, and the difference in the number of amino terminal groups, of the sheath polyamide of the core-sheath type composite fiber before dyeing. It is intended to achieve level dyeing by removing or removing and homogenizing.

A schematic diagram showing the concept of the mechanism is shown in FIGS. The three-layer structure in the figure shows a longitudinal section of the core-sheath type composite fiber. First, in the left diagram of FIG. 1, before dyeing, when the dye from the outside of the fiber passes through the sheath and absorbs into the core, the alienation factor (1; の) of the sheath polyamide is randomly arranged. It is a state that is displayed. The diagram on the right shows a state in which the leveling agent (2; -O) is trying to equalize the alienation factor 1 of the sheath polyamide in the state at the time of the dyeing pretreatment.

The left diagram of FIG. 2 shows the result of the right diagram of FIG. 1, that is, the state of the core-in-sheath composite fiber after the pre-dyeing treatment, in which the alienation factor 1 of the sheath polyamide is uniformly arranged. It was done. The right figure shows a state in which the core-sheath type composite fiber is dyed, in which the dye (3; ○) passes between the homogenized alienation factors 1 of the sheath polyamide and is about to be absorbed by the core. It shows a state.

FIG. 3 shows the state of the core-sheath type composite fiber thus obtained after dyeing, in which the dye 3 is uniformly absorbed in the core.

The conditions for dyeing a core-sheath type composite fiber comprising a sulfonated aromatic dicarboxylic acid-modified polyamide in a sheath and a sulfonated aromatic dicarboxylic acid-modified polyester in a core are as follows. In consideration of the above, the dyeing temperature of the sulfonated aromatic dicarboxylic acid-modified polyester in the core must be increased to 100 to 130 ° C., but embrittlement of the sulfonated aromatic dicarboxylic acid-modified polyamide in the sheath (strength retention limit) In consideration of the above, the dyeing temperature is preferably set to around 120 ° C., and conditions for dyeing with a weak acidity are adopted in view of the nature of the cationic dye.

The pretreatment condition is a means for removing the leveling alienation factor of the sulfonated aromatic dicarboxylic acid-modified polyamide in the sheath, and is a dyeing condition of the sulfonated aromatic dicarboxylic acid-modified polyamide. C. was used.

As described above, according to the present invention, the leveling elimination factor of the polyamide of the sheath portion of the core-sheath type composite fiber is homogenized by using a leveling agent (surfactant). , A cover or the like to facilitate the permeation of the dye), and the core polyester is dyed only with a cationic dye to provide a level dyeing and a robust dyed product.

The dyeing conditions and the like do not need to adopt special special conditions, and the dyeing can be performed by using the conventional dip dyeing conditions.

[0017]

The present invention will be described in more detail with reference to the following examples. ◎ Example 1 50 denier 1 of the core-sheath type composite fiber (core-sulfonated aromatic dicarboxylic acid-modified polyester / sheath-sulfonated aromatic dicarboxylic acid-modified polyamide: core-sheath composite ratio 50/50)
Two filaments are arranged on both the front and back, and the on-machine density wale: 28 W / IN, 55 C /
In IN, a tricot greige fabric was obtained. Dyeing was performed under the following conditions to obtain a dyed product.

Dyeing processing conditions [Pretreatment] ・ Pretreatment agent: alkyl allyl sulfonate 2 g / 1 ・ Pretreatment conditions: 95 ° C. × 90 minutes [Dyeing] ・ Dye 1: Basic Yellow 67 0.40% Dye 2: Basic Red 46 0.16% Dye 3: Basic Blue 54 0.14% Dispersant: Nonionic, anionic special surfactant 1 g / 1 PH adjuster: acetic acid, sodium acetate 0.2 g / 1 each Dyeing time: As shown in Table 1, the obtained dyed product was excellent in levelness and fastness, as shown in Table 1.

Example 2 The core-sheath type composite fiber (core sulfonated aromatic dicarboxylic acid-modified polyester / sheath sulfonated aromatic dicarboxylic acid-modified polyamide: core-sheath composite ratio 50/50) 50 denier 1
2 filaments are arranged at the front and spandex 40 denier is arranged at the back. On-machine density wale: 28 W / IN, course: 66 C / IN, 2 Way by half structure
A tricot greige fabric was obtained. The product was obtained by dyeing under the following conditions.

Dyeing processing conditions [Pretreatment]-Pretreatment agent: alkyl allyl sulfonate 2 g / 1-Pretreatment conditions: 95 ° C x 90 minutes [Dyeing]-Dye 1: Basic Yellow 67 0.43% Dye 2: Basic Red 46 0.60% Dye 3: Basic Blue 54 0.13% Dispersant: Nonionic, anionic special surfactant 1 g / 1 PH adjuster: acetic acid, sodium acetate 0.2 g / 1 each Dyeing time: As shown in Table 1, the obtained dyed product was excellent in levelness and fastness, as shown in Table 1.

Example 3 The same raw woven fabric as in Example 2 was simultaneously dyed in a dye bath under the following conditions to obtain a dyed product. [Simultaneous dyeing treatment conditions] Dye 1: Basic Yellow 67 0.4% Dye 2: Basic Red 46 0.16% Dye 3: Basic Blue 54 0.14% Treatment agent: alkyl allyl sulfonate 2 g / l Dispersant: Nonionic, anionic special surfactant 1 g / 1 ・ PH adjuster: acetic acid, sodium acetate 0.2 g / 1 each ・ Dyeing time: 120 ° C. × 30 minutes The obtained dyed product is as shown in Table 1. , Excellent leveling property and fastness.

Example 4 The same raw woven knitted fabric as in Example 2 was pretreated under the following conditions, and then simultaneously dyed in a dye bath to obtain a dyed product. [Pretreatment conditions]-Pretreatment agent: alkyl allyl sulfonate 2 g / l-Pretreatment time: 95 ° C x 30 minutes [Simultaneous dyeing treatment conditions]-Dye 1: Basic Yellow 67 0.43% Dye 2: Basic Red 46 0.6% Dye 3: Basic Blue 54 0.13% Treatment agent: alkyl allyl sulfonate 1 g / l Dispersant: nonionic, anionic special surfactant 1 g / 1 PH adjuster: acetic acid, sodium acetate 0.2 g / 1 each. Dyeing time: 120 ° C. × 30 minutes As shown in Table 1, the obtained dyed product was excellent in levelness and fastness.

Comparative Example 1 The same tricot greige fabric as in Example 1 was dyed under the following conditions without pretreatment, to obtain a product. [Dyeing]-Dye 1: Basic Yellow 67 0.40% Dye 2: Basic Red 46 0.16% Dye 3: Basic Blue 54 0.14%-Dispersant: Nonionic, anionic special surfactant 1g / 1-PH Conditioning agent: acetic acid, sodium acetate 0.2 g / 1 each. Dyeing time: 120 ° C. × 30 minutes As shown in Table 1, the resulting dyed product was excellent in fastness, but was streaky. The unevenness was poor with unevenness.

Comparative Example 2 The same tricot greige fabric as in Example 1 was dyed under the following conditions without pretreatment to obtain a product. [Dyeing] Dye 1: Basic Yellow 67 0.32% Dye 2: Basic Red 46 0.128% Dye 3: Basic Blue 54 0.112% Dye 4: Acid Yellow 242 0.09% Dye 5: Acid Red 299 0.01% Dye 3: Acid Blue 264 0.14% ・ Dispersant: Nonionic, anionic special surfactant 1 g / 1 ・ PH adjuster: acetic acid, sodium acetate 0.2 g / 1 each ・ Dyeing time: 120 ° C. × 30 minutes-Fixing agent: 2% tannin-based bath fixative-Fixing condition: 70 ° C x 20 minutes As shown in Table 1, the resulting dyed product has little streak-like unevenness, but has fastness. Was inferior.

Comparative Example 3 The same 2-way tricot greige fabric as in Example 2 was dyed under the following conditions without pretreatment, to obtain a product. [Dyeing] Dye 1: Basic Yellow 67 0.43% Dye 2: Basic Red 46 0.60% Dye 3: Basic Blue 54 0.13% Dispersant: nonionic, anionic special surfactant 1 g / 1 PH Conditioning agent: acetic acid, sodium acetate 0.2 g / 1 each. Dyeing time: 120 ° C. × 30 minutes As shown in Table 1, the resulting dyed product was excellent in fastness, but was streaky. The unevenness was poor with unevenness.

Comparative Example 4 The same 2-way tricot greige fabric as in Example 2 was dyed under the following conditions without pretreatment, to obtain a product. [Dyeing] Dye 1: Basic Yellow 67 0.344% Dye 2: Basic Red 46 1.28% Dye 3: Basic Blue 54 0.104% Dye 4: Acid Yellow 242 0.08% Dye 5: Acid Red 299 0.40% Dye 3: Acid Blue 264 0.08% ・ Dispersant: Nonionic, anionic special surfactant 1 g / 1 ・ PH adjuster: acetic acid, sodium acetate 0.2 g / 1 each ・ Dyeing time: 120 ° C. × 30 minutes-Fixing agent: 3% tannin-based single bath fixative-Fixing condition: 70 ° C x 20 minutes As shown in Table 1, the resulting dyed product has little streak-like unevenness, but has fastness. Was inferior.

[0027]

[Table 1]

[0028]

According to the present invention, a dyed article which is free from streaky unevenness, has good leveling properties and is excellent in fastness, is obtained by only dyeing the core of the core-sheath type composite fiber with a cationic dye. Can be provided.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 conceptually shows a state in which a leveling agent makes uniform the elimination factor of a sheath polyamide of a core-sheath type composite fiber of the present invention before and after pretreatment.

FIG. 2 is a conceptual diagram of the dyeing of the core-sheath type composite fiber of the present invention in FIG. 1 having a sheath polyamide having a uniform alienation factor in a sheath.

FIG. 3 is a conceptual diagram of coloring of a sheath-core composite fiber after dyeing obtained through the processes of FIGS. 1 and 2;

[Explanation of symbols]

 1: alienated molecule 2: leveling agent 3: dye

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuo Shino 2-2-1 Nihonbashi Muromachi, Chuo-ku, Tokyo Toray Industries, Inc. Tokyo Office (72) Inventor Naoyuki Kinoshita 1-1-1, Horikoshi, Nishi-ku, Nagoya-shi, Aichi Prefecture No. Toray Industries, Inc. Aichi Plant (72) Inventor Nobuichi Iwasaki 1-13-24, Hamamatsucho, Kiryu-shi, Gunma F-term in Asakura Senfu Co., Ltd.

Claims (6)

[Claims] 1. A core-sheath type conjugate fiber comprising a sulfonated aromatic dicarboxylic acid-modified polyamide disposed in a sheath at a composite ratio of 25 to 75% by weight, and a sulfonated aromatic dicarboxylic acid-modified polyester disposed in a core. A method for dyeing a core-sheath type composite fiber, comprising dyeing the core with a leveling agent and a substantially cationic dye. 2. The method according to claim 1, wherein the leveling agent is at least one selected from nonionic surfactants and anionic surfactants. 3. The method for dyeing a core-sheath type composite fiber according to claim 2, wherein the nonionic surfactant is a nitrogen-containing nonionic surfactant. 4. The nitrogen-containing nonionic surfactant is at least one selected from fatty acid alkanolamides, polyoxyethylene fatty acid amides, alkanolamine esters, polyoxyethylene alkylamines and amine oxides. For dyeing core-sheath type composite fibers. 5. The method according to claim 2, wherein the anionic surfactant is a sulfonate type surfactant. 6. The sulfonate type surfactant is at least one selected from an alkyl sulfonate, a sulfosuccinate, an ester sulfonate, an alkyl allyl and an alkyl naphthalylene sulfonate and an N-acyl sulfonate. The method for dyeing a sheath-core composite fiber according to claim 5, which is one kind.