JP3221752B2 - Dyeing method of polyester and cotton mixed fiber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for dyeing polyester / cotton mixed fibers. More specifically, the present invention relates to a method for scouring, bleaching, and dyeing a mixed fiber of polyester and cotton with a disperse dye or a disperse dye and a direct dye or a reactive dye.

[0002]

2. Description of the Related Art Usually, in dyeing a polyester / cotton mixed fiber, a scouring and bleaching step is performed as a step prior to the dyeing step. In recent years, methods for performing scouring, bleaching and dyeing steps in one bath have been studied for energy saving and labor saving. However, in the scouring treatment, a large amount of alkali is used in combination. On the other hand, at the dyeing temperature, the disperse dye is decomposed by the action of the alkali, so that the scouring treatment and the dyeing step cannot be performed in a single bath.

[0003] As a method of solving this problem, the p
H slide method (for example, see JP-A-60-224)
Nos. 884 and 60-17183) and a method of suppressing the decomposition of a disperse dye by the presence of an amino acid in a dye bath (see JP-A-2-229283).

[0004]

However, although these methods are performed in the same bath, the scouring step, the bleaching step, and the dyeing step are still performed as separate steps. Was needed. If these methods performed in different steps can be performed simultaneously in the same bath and at the same time, significant energy saving and labor saving can be achieved, and thus development of such a method has been eagerly desired.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies on a method of performing each of the steps of scouring, bleaching and dyeing more easily. As a result, the scouring, bleaching, disperse dye and The present inventors have found that dyeing with a direct dye can be performed at the same time, and arrived at the present invention.

That is, the gist of the present invention is polyester,
In a method in which the cotton mixed fiber is subjected to a polyester scouring treatment and a cotton bleaching treatment, and both fibers are dyed with a disperse dye for polyester and a direct or reactive dye for cotton, the material to be dyed is pH 8.5 to 11, Preferably in a 9-10 alkaline water bath in the presence of 0.5-3 g / l scouring agent, 0.75 / 5.25 g / l hydrogen peroxide and 0.02-4 g / l amino acids 120-1 using disperse dye or disperse dye and direct dye
A polyester characterized in that a scouring treatment, a bleaching treatment and a dyeing are carried out simultaneously by dyeing at a temperature of 35 ° C.,
Dyeing method of cotton mixed fiber, and polyester,
In a method in which a cotton mixed fiber is subjected to a polyester scouring treatment and a cotton bleaching treatment, and both fibers are dyed with a disperse dye and reactive dyeing, the material to be dyed is pH 8.5 to 1
1, preferably 0.5 to 3 in a 9 to 10 alkaline water bath
g / l scouring agent, 0.75 to 5.25 g / l hydrogen peroxide and 0.02 to 4 g / l amino acids
Dyeing at a temperature of 120 to 135 ° C. using a classification dye simultaneously performs scouring treatment, bleaching treatment and dyeing of polyester with a disperse dye, and then, after reduction washing, dyes cotton with a reactive dye. The method of dyeing polyester and cotton mixed fibers.

Hereinafter, the contents of the present invention will be described in detail. The fiber which is the object of the present invention is a mixed fiber of polyester and cotton. The form of the fiber may be any of a blended product, a mixed twist yarn, and a mixed knitted woven product. The mixing ratio of polyester and cotton is not particularly limited, but generally, polyester: cotton is 70:30 to 30:70.
Of the degree is often used. Further, a fiber in which another fiber (for example, rayon or the like) is further mixed with a mixed fiber of polyester and cotton may be used.

A feature of the present invention resides in that a scouring treatment, a bleaching treatment and a dyeing are simultaneously carried out by dyeing with a disperse dye and, if necessary, a direct dye in the presence of a scouring agent, hydrogen peroxide and amino acids. When dyeing cotton with a reactive dye, a separate dye bath is prepared and dyed. The scouring agent used may be any of the usual scouring agents used for scouring polyesters, and examples thereof include alkyl allyl polyglycol ether blends, polyethylene glycol alkyl phenyl ether, and polyoxyethylene alkyl allyl ether.

The amount of the scouring agent is 0.5 to 3 per liter.
g, preferably 1-2 g. If the amount of the scouring agent is too small, the effect of removing the knitting oil or wax is undesirably reduced. If the amount is too large, the foaming property in the dyeing bath increases, which is not preferable. Hydrogen peroxide is used as a bleaching agent. Hydrogen peroxide is usually added as a 30-35% aqueous hydrogen peroxide solution. The amount used is 0.75 to 5.25 g / l in terms of the amount of hydrogen peroxide in the hydrogen peroxide solution (2 to 15 g / l in terms of 35% hydrogen peroxide solution), and preferably 1 to 3.5 g.
/ L (3 to 10 g / l in terms of 35% hydrogen peroxide solution), particularly preferably 1.4 to 1.75 g / l (4 to 5 g / l in terms of 35% hydrogen peroxide solution). If the amount is too small, the bleaching effect of cotton is not sufficient (whiteness is insufficient), which is not preferable. If the amount is too large, decomposition of the disperse dye is accelerated, which is not preferable.

The pH is 8.5-11, preferably 9-10.
And A strong alkali is not preferable because the disperse dye is decomposed. Acidity is not preferred because scouring and bleaching effects are lost. As the pH adjuster, an alkali metal compound such as sodium hydroxide, potassium hydroxide, sodium carbonate, sodium hydrogen carbonate and the like can be usually used, but sodium hydroxide is preferable.

The amino acids include amino acids and amino acid derivatives in which a part of the amino group in the amino acid is substituted. Specific examples of amino acids include glycine, alanine, aminobutyric acid, neutral amino acids such as aminocaproic acid,
Examples include acidic amino acids such as aspartic acid and glutamic acid, and basic amino acids such as lysine and arginine. Of these, glycine, alanine and glutamic acid are particularly preferred.

On the other hand, examples of the substituent on the amino group of the amino acid derivative include an alkyl group, an alkoxyalkyl group, a hydroxyalkyl group, a cyanoalkyl group and an acyl group. The used amount of amino acids is 0.02 to 4 g / l, preferably 0.05 to 2 g / l. If the amount is too small, the buffering power of pH and the chelating effect decrease, which is not preferable. If too much, the chelating effect increases, the decomposition of the metal-containing dye,
It is not preferable because it causes discoloration.

[0013] The disperse dye is selected from among disperse dyes having some resistance to alkali. In particular,
Azo disperse dyes such as monoazo and disazo dispersants which are resistant to alkali, anthraquinone disperse dyes, disperse dyes such as phthalocyanine and copper formazan are preferably used.
The direct dye is selected from direct dyes that are resistant at the dyeing temperature of the disperse dye and have good dyeing properties in an alkaline bath. I. Direct Blue-248, C.I.
I. Direct Black-22 and the like can be exemplified.

The reactive dye used in the subsequent reactive dye dyeing step is not particularly limited.
I. Reactive Yellow 15, C.I. I.
Reactive Red 21, C.I. I. React
live Blue 19, and the like. For simultaneous treatment of scouring, bleaching and dye, a scouring agent, hydrogen peroxide and an appropriate amount of dye are added to a bath, and the fibers to be treated are immersed in the bath.
This is done by heating to 35 ° C. Heating time is 30
~ 60 minutes is preferred. After the dyeing step of the present invention,
Post-processing such as antistatic processing and softening generally performed after the ordinary dyeing step can be performed according to a conventional method.

[0015]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the examples unless it exceeds the gist thereof. In the examples, an example of dyeing only polyester with a disperse dye is described.
When direct dyes are used for dyeing cotton as well, an appropriate amount of a suitable dye may be blended together with a disperse dye in a bath, and when a reactive dye is used, a separate dyeing treatment may be used in a separate step. , So it is omitted.

The evaluation was performed as follows. Surface Concentration The K / S value of the comparative dyed cloth was calculated using an optical measuring device based on the dyed cloth dyed under the conventional acidic dyeing conditions, and the density was evaluated. Color Tone Difference A comparative dyed cloth was compared as a total color difference with an optical measuring device using the formula of CIE ^* L ^* a ^* b ^{* based} on a dyed cloth dyed under the conventional acidic dyeing conditions.

Reference Example As a standard, dyeing was carried out by the following conventional method. Refining treatment Caustic soda (flakes) 1.5 g / l, chelating agent (special phosphorus compound: Nippon Dyeing Chemical Co., trade name Multifine 2)
5) 0.5g / l, scouring agent (alkyl allyl polyglycol ether compound: Hoechst, trade name Host)
apal SFL) 1.5 g / l as a treatment bath, 95 ° C.
For 30 minutes, and then cooled.

Bleaching treatment A water bath consisting of 4.5 g / l of hydrogen peroxide solution (concentration: 35%), 2.0 g / l of hydrogen peroxide stabilizer (sodium silicate), and 1.5 g / l of caustic soda (flake) was treated. Bath and 90
A heat bath treatment at 30 ° C. for 30 minutes is performed, followed by cooling, washing sufficiently with hot water and washing with water to remove residual components such as alkali in polyester and cotton mixed knitted fiber (polyester: cotton = 65: 35).

In the dyeing bath, a dispersant (a mixture of nonionic and anionic condensates:
Hoechst, product name Eganal LMD) 1.0
g / l and the dyes shown in Table 1 were added. Finally, the pH was adjusted to 5.0 ± 0.2 with acetic acid and sodium acetate, and the mixed knitted fiber of polyester and cotton which had been scoured and bleached was soaked. , The temperature was raised to 130 ° C, and after holding for 45 minutes,
After a washing step, it was used as a standard cloth for judging a dyed product.

EXAMPLE A scouring agent (alkyl allyl polyglycol ether compound: Hostapal S, manufactured by Hoechst) was added to the bath.
FL) 1.5 g / l, hydrogen peroxide stabilizer (mixture of polymerized phosphate and organic carboxylic acid: trade name L, manufactured by Hoechst)
Astabil 1020) 1.5 g / l, aqueous hydrogen peroxide (concentration 35%) 4.5 g / l (converted to hydrogen peroxide 1.58 g / l), dyeing aid (amino acids) (Mitsubishi Kasei Hoechst Co., Ltd.) (Trade name: JPH95: glycine content: 17 g / l) 4.0% φ. w. f. 1.0 g / l of a dispersant (mixture of nonionic and anionic condensates: Hoganst, trade name: Eganal LMD) and the dyes shown in Table 1 were added, and polyester and cotton mixed fibers (65:
35), and the temperature was raised to 130 ° C. The temperature was kept at 130 ° C. for 45 minutes and then allowed to cool. The surface density and color investigation were compared with the reference example. The results are shown in Table-3.

Comparative Example In the examples, caustic soda (38) was used instead of JPH95.
° ^Be ) It was the same except that 2.1 g / l was used. The results are shown in Table-3.

[0022]

[Table 1]

[0023]

[Table 2]

[0024]

[Table 3]

[0025]

[Table 4]

[0026]

[Table 5]

[0027]

[Table 6]

[0028]

According to the method of the present invention, the number of steps for dyeing a polyester / cotton mixed fiber is reduced, thereby saving labor.
Energy saving can be achieved.

──────────────────────────────────────────────────続 き Continuation of front page (51) Int.Cl. ⁷ Identification symbol FI D06P 5/00 103 D06P 5/00 103 105 105 (56) References JP-A-2-229283 (JP, A) JP-A-1 JP-A-314790 (JP, A) JP-A-61-152883 (JP, A) JP-A-47-12039 (JP, A) JP-A-49-62777 (JP, A) JP-A-63-165587 (JP, A) JP-A-56-144277 (JP, A) JP-A-62-238889 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06P 3/82 D06P 3/54 D06P 3 / 62 D06P 3/66 D06P 3/87 D06P 5/00

Claims (3)

(57) [Claims] 1. A method of subjecting a polyester / cotton mixed fiber to a scouring treatment of polyester and a bleaching treatment of cotton to dye the polyester with a disperse dye,
The material to be dyed is placed in an alkaline water bath at pH 8.5 to 11 for 0.5
Dyeing with disperse dyes at a temperature of 120-135 ° C. in the presence of ３3 g / l scouring agent, 0.75-5.25 g / l hydrogen peroxide and 0.02-4 g / l amino acids A method for dyeing a mixed fiber of polyester and cotton, comprising simultaneously performing scouring treatment of polyester, bleaching treatment of cotton and dyeing of polyester. 2. A method in which polyester and cotton mixed fibers are subjected to a polyester scouring treatment and a cotton bleaching treatment, and both fibers are dyed with a polyester disperse dye and cotton directly with a dye.
0.5 to 3 g / l of scouring agent in an alkaline water bath of No. 11,
0.75 to 5.25 g / l hydrogen peroxide, and 0.0
In the presence of 2 to 4 g / l of amino acids, dyeing of polyester and cotton is performed simultaneously by dyeing with a disperse dye and a direct dye at a temperature of 120 to 135 ° C., bleaching of cotton and dyeing of polyester and cotton. A method of dyeing a mixed fiber of polyester and cotton, characterized by the fact that: 3. A method of subjecting a mixed fiber of polyester and cotton to a scouring treatment of polyester and a bleaching treatment of cotton, and dyeing both fibers with a disperse dye and cotton with a reactive dye.
0.5 to 3 g / l of scouring agent in an alkaline water bath of No. 11,
0.75 to 5.25 g / l hydrogen peroxide, and 0.0
In the presence of 2 to 4 g / l of amino acids, dyeing with a disperse dye at a temperature of 120 to 135 ° C. is carried out to simultaneously carry out a polyester scouring treatment, a cotton bleaching treatment and a polyester dye with a disperse dye. Dyeing cotton with a reactive dye after reduction washing.