JPH0544176A - Dyeing method for polyester-polyamide blended textile - Google Patents

Abstract

PURPOSE:To perform uniform dyeing in good fastness using a disperse dye of a blended textile comprising polyester and polyamide ultrafine fibers under an alkaline condition. CONSTITUTION:A blended textile comprising polyester and polyamide fibers (e.g. ultrafine fibers) is uniformly dyed in good fastness through a conventional process using a disperse dye stable in an alkaline state at pH>=8 (pref. 8.5-10.5).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dyeing a knitted or woven fabric of mixed fibers composed of polyester and polyamide, and in particular, it is possible to easily obtain the same color of polyester and polyamide.
Moreover, the present invention relates to a dyeing method capable of obtaining a fabric having excellent fastness. Here, the mixed fiber is defined as a woven fabric and a knitted fabric formed by mixing two or more kinds of fibers or yarns having different physical properties by any means such as spinning.

[0002]

2. Description of the Related Art A method of dyeing polyester fibers with a disperse dye and dyeing polyamide fibers with an acid dye is widely used as a means for dyeing mixed fibers of polyester and polyamide in the same color. However, these methods are unsatisfactory in terms of color blur, fastness, and sharpness. Particularly, in the case of dyeing a mixed fiber composed of ultrafine fibers of polyester and polyamide, there have been serious problems such as easy occurrence of color blur and low fastness. This is because there is a large difference in the way of dyeing and the appearance of color (that is, the dyeing behavior and color developability) when dyeing polyester with a disperse dye and polyamide with an acid dye. Furthermore, color matching when the dye is a single item is relatively easy,
In general, it is often mixed and dyed with a plurality of dyes, and when dyeing a mixed cloth composed of two or more kinds of fibers, different dyeing behaviors are also taken into consideration. Is said to occur particularly easily.

Regarding the dyeing of polyester and polyamide in ultrafine fibers, JP-B-60-29787 discloses a method of dyeing a disperse dye and an acid dye for 50 minutes or more, and JP-A-61-3.
Some of them use polyester fibers modified so as to be dyed with a basic dye like No. 4277.

[0004]

The method of Japanese Patent Publication No. 60-29787 requires dyeing for a long time, and the difficulty of making polyester and polyamide the same color has not been solved. Further, in JP-A-61-34277, there is a problem that the strength of the yarn is lowered and the cost of the yarn is increased due to the addition of a modification for making the polyester dyeable with a cationic dye.

The present invention has been made in view of the above circumstances, and in the mixed fiber of polyester and polyamide, the present ordinary dyeing technique can be applied even when the ordinary polyester and polyamide are used. The present invention aims to provide a dyeing method capable of achieving the same color properties of polyester and polyamide while maintaining excellent fastness.

[0006]

Means for Solving the Problems The present invention, which has achieved the above-mentioned object, refers to a mixed fiber composed of polyester and polyamide.
The gist is to dye with an alkali-stable disperse dye on the alkali side having a pH of 8 or more.

[0007]

The composite fiber made of polyester and polyamide referred to in the present invention is not only a mixed-spun, woven or knitted fabric,
It includes ultrafine fibers obtained from sea-island type composite fibers and split fiber type composite fibers. The ultrafine fibers referred to here are
Single fiber denier after the partial dissolution or splitting of polyester or polyamide is 0.5 or less. Polyester is not limited to polyethylene terephthalate, and various types of copolymerized various copolymerization components such as isophthalic acid and 5-sodium sulfoisophthalic acid as an acid component other than terephthalic acid, and butylene glycol and polyethylene glycol as a glycol component. Of the polyester copolymer. Polyamide refers to nylon 6,66,610,46, aromatic polyamide and the like.

We have used various dyes to obtain various pH values.
As a result of repeated research by dyeing a mixed fiber of polyester and polyamide under the conditions, it was found that dyeing with a disperse dye on the alkali side having a pH of 8 or more has excellent color uniformity. The disperse dye referred to in the present invention is a dye that is stable at pH 8 or more and dyes polyester and polyamide. When dyeing polyester with a disperse dye, it is usually carried out on the acidic side at pH 6 or less, but the polyester and polyamide are made the same color. In the present invention, dyeing is carried out at a pH of 8 or higher, preferably 8.5 to 10.5. The alkaline side in the present invention means the pH before the start of dyeing.
Is 8 or more. As the alkaline agent used for adjusting to the alkaline side, there are NaOH, KOH _, Na ₂ CO _3, K ₂ CO _3, ammonium salt and the like, but NaOH is usually used. Further, a buffer solution can be used to stabilize the pH.

Disperse dyes that are stable on the alkaline side and that dye polyesters and polyamides are all used in the present invention, and preferred examples include, for example, Dianix / Samaron PH manufactured by Mitsubishi Hoechst Co., Ltd. (for example, Orange
UPH, Dark Blue UPH, YellowSPH, Scarlet SPH, Carmine S
PH, Violet SPH, Marine Blue SPH, Black Blue SPH extra
conc. paste, etc.) or Panorama manufactured by Nippon Kagaku Co., Ltd.
Disperse dyes for alkaline dyeing (eg Yellow GG, Yellow G
R 200, Orange FR, Rubine GS 150, Red B, Red 3BK, Violet
SE, Blue R, Blue BG, Blue BGA, Brilliant Blue CB, Nav
y Blue 5G, Black VF-6 (P), Black VF-16 (P), Black AK-1
Miketon Polyester manufactured by Mitsui Toatsu Chemicals, Inc. such as 200-N
Examples include series.

The disperse dyes exemplified above are generally used in a rational dyeing method of 100% polyester. The rationalized dyeing method mainly aims at removing oligomers existing when dyeing polyester, preventing threads and hits, improving dyeing fastness (reduction washing step omitted), and simultaneous processing of scouring (de-sizing) and dyeing. However, the purpose of dyeing the same color of polyamide and polyester in the present invention is significantly different. The dyeing referred to in the present invention means, in addition to yarn dyeing, knitting, cloth dyeing of woven fabrics, etc., and piece dyeing, etc. Also, ultrafine fibers made of polyester and polyamide, and cotton, wool, acrylic fiber, rayon, etc. Includes mixed dyeing with 3 fibers.

[0011]

【Example】

Example 1 DIANIX DARK RED UPH 1.8% owf (vs. fiber weight) NaOH 0.02 g / l pH 9.5,110 ° C. × 30 minutes Bath ratio (1: 1)
5) Dyeing was performed using a jet dyeing machine.

Example 2 PANORAMA Navy Blue S-BG200 5% owf (vs. fiber weight) Na ₂ CO ₃ 0.03 g / l pH 10, 115 ° C. × 20 minutes Dyeing was carried out using a jet dyeing machine.

Comparative Example 1 Dyeing was carried out by changing the pH of Example 1 to an acidic side of 4.0 with CH ₃ COOH. Comparative Example 2 Dyeing was carried out by changing the pH of Example 2 to an acidic side of 4.0 with CH ₃ COOH.

Comparative Example 3 Additional test of Japanese Examined Patent Publication No. 60-29787 (disperse dye) RESOLINE BLUE FBL 4% owf (weight of polyester fiber) (acid dye) KAYANOL MILL.BLUE 4.5% owf (weight of polyamide fiber) pH to CH _{3 to 3 with} COOH or NaOH. Dyeing was carried out under the conditions of Example 1 at 115 ° C. for 70 minutes.

Comparative Example 4 Supplementary Examination of Japanese Examined Patent Publication No. 60-29787 (disperse dye) RESOLINE BLUE FBL 4% owf (weight of polyester fiber) (acid dye) KAYANOL MILL.BLUE GW 4.5% owf (weight of polyamide fiber) pH Adjusted to 10 with CH ₃ COOH or NaOH. Dyeing was carried out under the conditions of Example 1 at 115 ° C. for 20 minutes. Table 1 shows the results of Examples 1 and 2 and Comparative Examples 1 to 4.

[0016]

[Table 1]

As is clear from Table 1, Comparative Examples 1, 2,
In 4, the same color of nylon 6 and polyester can not be obtained,
Although the same color property was obtained in Comparative Example 3, the dyeing time was as long as 70 minutes. On the other hand, in each of Examples 1 and 2, the dyeing time was shorter than that of Comparative Example 3, and the same color property of polyester and polyamide 6 was obtained only by the disperse dye.

[0018]

EFFECTS OF THE INVENTION Since the present invention is constituted as described above, in the mixed fiber of polyester and polyamide, the ordinary polyester and polyamide are used, and the existing general-purpose technology is simply applied to obtain excellent fastness. It has become possible to provide a dyeing method capable of achieving the same color properties of polyester and polyamide while maintaining the above.

Claims (1)

[Claims] 1. A method for dyeing mixed fibers, which comprises dyeing mixed fibers made of polyester and polyamide with a disperse dye which is stable to alkali on the alkali side having a pH of 8 or more.