JP2784724B2 - Dyed polyester fine fiber structure and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fibrous structure composed of polyester fine fibers and dyed with a disperse dye, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, in the dyeing of fiber structures such as yarns, woven fabrics and knits made of polyester fine fibers with a disperse dye, the thick portions of the dyed fine fibers are dyed darker than the details. A method is known in which the phenomenon is used to leave the details in white or light color to obtain a lustrous or marbling tone.

[0003]

However, in the conventional method, since the color expression is carried out with the characteristic of the deep dyeing of the thick part of the thick and thin fiber, the color density of the thick part is emphasized and the whole is expressed in a dark color. I could only get it. The present invention is based on the finding that the thick part of the fine fiber has a deep dyeing property and has an easy decoloring property by an alkali. SUMMARY OF THE INVENTION An object of the present invention is to obtain a dyed thin fiber structure having a calm aesthetic color expression by leaving the thick part of the dyed thin fiber white or light color.

[0004]

SUMMARY OF THE INVENTION The present invention is a fibrous structure composed of polyester thick fibers dyed with a disperse dye, wherein the thick portions of the dyed thin fibers are at least lighter in color than the details. Dyeing polyester fiber structure characterized by the fact that, after dyeing a fiber structure composed of polyester thick fibers with a disperse dye, impregnating with a heated alkali aqueous solution at least the thick portion of the dyed thin fibers part
Decolorize and remove at least a part of the thick part of the dyed fine fiber in detail.
A method for producing a dyed polyester fiber structure, characterized in that the dyed polyester fiber structure has a light color .

[0005] In the present invention, the polyester fine fibers are those produced by any known method, preferably a polyester having ethylene terephthalate as a main repeating unit. Is a fiber in which the details of the stretched portion are mixed in the longitudinal direction of the fiber, and is a thick fiber obtained by the method disclosed in JP-A-5-239714, that is, the birefringence is 0.02.
The following formula (1)
Thick and thin fibers obtained by two-stage drawing under the conditions satisfying (6) are preferably used.

(1) 0.45 × MDR ≦ TDR ≦ 0.55 × MDR (2) TDR = DR ₁ × DR ₂ (3) 0.40 × MDR ≦ DR ₁ ≦ 0.50 × MDR (4) 1 0.050 ≦ DR ₂ ≦ 1.300 (5) Tg ≦ HRT ≦ Tg + 20 ° C. (6) HPT <Tc where TDR is the total draw ratio, MDR is the maximum draw ratio, DR ₁ is the first draw ratio, DR ₂ Is the second draw ratio, HR
T is the take-up roller temperature (° C.) in the first stage stretching, Tg
Indicates a glass transition temperature (° C.), HPT indicates a heat setting hot plate temperature (° C.) in the second stage region, and Tc indicates a crystallization temperature (° C.).

In the dyed polyester fine fiber structure of the present invention, any form of a fiber structure, such as a yarn or a woven fabric or a knitted fabric, the whole or a part of which is made of polyester fine fiber, is a disperse dye. The dyed fiber structure is a dyed fiber structure in which the thick part of the dyed fine fiber is lighter or non-colored than the details, and if the thick part is non-colored, the dyed fiber structure is in a single-dyed state.

[0008] Disperse dyes used for dyeing include monoazo type,
Disazo dyes such as disazo, anthraquinone, aminoquinone, and nitrodiphenylamine are exemplified.

The dyed polyester thick and thin fiber structure of the present invention is obtained by the following method. Polyester fine fiber structure is selected from disperse dyes of various systems as described above, dyed at 90 to 140 ° C., and dyes which are easily decomposed by alkali are used alone or in combination of two or more, and batch dyeing is performed. Dyeing is performed by any known method such as continuous dyeing. After dyeing, it is desirable to perform reduction washing using hydrosulfite or the like in order to obtain a clear color.

[0010] After dyeing with a disperse dye, the dyed fiber structure after drying or without drying, decolorized part or all the thickness of FutoshiHoso fibers stained impregnated with an aqueous alkaline solution, a part or All thick sections are lighter or more uncolored than the details .

In the impregnation treatment with a heated alkali aqueous solution, alkali metals such as sodium hydroxide and potassium hydroxide, alkaline earth metal hydroxides such as magnesium hydroxide and calcium hydroxide, diethanolamine and triethanol are used as alkalis. Using amines such as amines, the alkali concentration does not exceed 500 g / l, preferably 40 g / l.
Impregnation is carried out with an aqueous solution at a temperature of 80 to 120 ° C., preferably 90 to 110 ° C. by a pad method, a dipping method or the like within a range not exceeding g / l. It should be noted that such an impregnation process can also be performed by using a glue in combination and partially attaching and heating.

When the alkali concentration exceeds 500 g / l,
The hydrolysis of the thick part of the fine fiber is excessively advanced, and the fiber strength is reduced. Also, if the temperature is less than 80 ° C., the color of the dyed thin fiber cannot be sufficiently decolorized from the thick part, and exceeds 120 ° C. Then, the hydrolysis of the thick part progresses too much, and the fiber strength is reduced, and the control of decolorization becomes extremely difficult.

The degree of the alkali treatment is such that the details of the dyed fine fibers are not decolorized and only the thick portions are decolorized. However, depending on the fineness of the fibers, the structure of the fiber structure, the dyeing concentration, etc. Differently, the weight loss rate of fine fiber is 0.5-50wt
%, Preferably 5 to 25 wt%.

In the impregnation treatment with a heated alkali aqueous solution in the present invention, (1) the thick portion of the polyester fine fiber is an undrawn portion, and the structure of the amorphous portion is loose. The dye molecules are easily dyed, but in the heated alkaline aqueous solution, the dye molecules once dyed in the fiber are also easily released. (2) The dye molecules released from the thick portion of the polyester fine fiber are treated with alkali. Decomposes and decolorizes, and high pH prevents restaining
(3) Alkali as well as dye molecules easily penetrate into the thick part of the polyester fine fiber, so that the thick part of the polyester fine fiber is decolorized.

In addition, during the impregnation treatment with a heated alkali aqueous solution, in order to more effectively prevent the dye molecules detached from the thick part of the polyester thick fiber from re-dyeing on the thick part, the detached dye It is desirable to actively oxidize or reduce molecules, and it is preferable to add hydrosulfite, hypochlorous acid, chlorite, perchloric acid, hydrogen peroxide, potassium permanganate, etc. to the aqueous alkali solution, particularly The use of hydrosulfite is effective. The addition of hydrosulfite was carried out at a hydrosulfite concentration of 30.
g / l, preferably not more than 20 g / l.

The impregnating treatment with the heated alkali aqueous solution in the present invention is performed in the same manner as the alkali reducing treatment usually applied to polyester fiber cloth and the like. It can be done and is preferred.

[0017]

The present invention will be described below in more detail with reference to examples.

(Example 1) A flat knitted fabric of 24G was knitted with 75d / 36f polyethylene terephthalate thick and thin fibers. The knitted fabric was heated at a rate of 2 ° C./min from normal temperature at a rate of 2 ° C./min using a dye solution of the following disperse dye, dyed at 130 ° C. for 30 minutes, washed with water, and then the following reducing solution was used. Used and washed under reduction. Next, the dyed knitted fabric is heated from normal temperature at a rate of 2 ° C./min using the following alkaline aqueous solution to 100
After immersion at 30 ° C. for 30 minutes, it was washed with water. The weight loss rate of the dyed knitted fabric at this time was 8 wt%. The thick part of the thin fiber dyed with the disperse dye by the alkali treatment was completely decolorized. The obtained knitted fabric was an aesthetic knitted fabric in which the thick portion of the thick and thin fibers was left white and the details were colored in a vivid purple.

Disperse dye liquor: Bath ratio 1:30 Dyanix Violet 2RE (Disperse dye manufactured by Mitsubishi Kasei Hoechst) 1% owf (based on fiber weight) Disper TL (Dispersant manufactured by Meisei Chemical Co.) 0.5 g / l Disper VG (Dispersant manufactured by Meisei Chemical Co., Ltd.) 0.5 g / l Ultra MT-N2 (phosphate compound manufactured by Minejima Chemical Co., Ltd.) 0.5 g / l

Reduction liquid: bath ratio 1:30 Hydrosulfite 1 g / l Sodium carbonate 1 g / l Monogen (Daiichi Kogyo Seiyaku Co., Ltd. detergent) 1 g / l

Alkaline aqueous solution: Bath ratio 1:30 Sodium hydroxide 10 g / l Hydrosulfite 5 g / l Sodium carbonate 10 g / l

Example 2 In Example 1, the immersion treatment at 100 ° C. for 30 minutes with an alkaline aqueous solution was changed to the immersion treatment at 100 ° C. for 20 minutes, and the weight reduction rate of the dyed knitted fabric was 6 wt%.
Staining, reduction washing, and
An alkali treatment was performed. The obtained knitted fabric was an aesthetic knitted fabric in which the thick part of the fine fibers was colored in light purple and the details were colored in clear purple.

Comparative Example The dyed knitted fabric obtained in Example 1 was immersed in water at 100 ° C. for 30 minutes. In the obtained knitted fabric, the thick part of the thick and thin fibers was dark purple and the details remained purple.

[0024]

According to the present invention, it is possible to obtain a dyed fiber structure having an aesthetic hue in which the thick part is left white or has a light color, a lustrous hue, or a marbling hue, from the fibrous structure of the polyester fine fiber. By using the conventional method, it is possible to express colors based on the dark color of the thick part of thick and thin fiber, which is different from the marbling tone, and to combine the shape of the thick part with a rich color change and an elegant dyed fiber structure. Obtainable.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI D06P 3/00 D06P 3/54 Z 3/54 5/02 101 5/02 101 5/13 Z 5/13 D06M 5/02 G // D06M 101: 32 (58) Field surveyed (Int.Cl. ⁶ , DB name) D06P 5/00 120 D01F 6/62 301 D01F 6/62 303 D03D 15/00 D06M 11/38 D06P 3/00 D06P 3/54 D06P 5/02 101 D06P 5/13 D06M 101: 32

Claims (2)

(57) [Claims] 1. A dyed polyester fiber comprising a polyester fine fiber and dyed with a disperse dye, wherein the thick part of the dyed fine fiber is at least lighter in color than the details. Fine fiber structure. 2. A fibrous structure composed of polyester fine fibers is dyed with a disperse dye, and then impregnated with a heated alkali aqueous solution to at least partially cover the thick portions of the dyed fine fibers.
Decolorize and remove at least a part of the thick part of the dyed fine fiber in detail.
A method for producing a dyed polyester fiber structure, characterized in that the structure is made lighter .