JPH0551538A - Dye composition and method of dyeing by using it - Google Patents

Abstract

PURPOSE:To obtain a dye composition improved in pH dependence without losing the vividness of the hue of a cyanoazo blue dye by mixing two specified monoazo dyes. CONSTITUTION:A dye composition which contains dyes of formulas I and II. In formula II, X is Cl, Br or I; and R is methyl or ethyl. The use of a monoazo dye of formula I for dyeing hydrophobic fibers, such as polyester fibers, can give a blue color with vividness comparable to that obtainable with an anthraquinone blue dye (e.g. C.I. Disperse Blue 56) often used as a moderate blue dye and also shows sublimation fastness superior to that of the blue dye. However, the monoazo dye of formula I has such a shortcoming that it is inferior to the blue dye in pH dependence. The incorporation of a dye of formula II into a dye of formula I can improve the pH dependence, so that a dye composition not inferior to the blue dye in pH dependence can be obtained.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a dye composition and a dyeing method. More specifically, the present invention relates to a dye composition containing two or three kinds of disperse dyes having a specific structure and a method for dyeing hydrophobic fibers using the same.

[0002]

2. Description of the Related Art Equation (1)

[0003]

[Chemical 4]

When a hydrophobic fiber such as polyester fiber is dyed with the monoazo dye represented by, it is equivalent to an anthraquinone blue dye (for example, CI Disperse Blue 56) which is often used as a moderate blue dye. Since a vivid blue color tone is obtained and the sublimation fastness is superior to that of Blue 56, the amount thereof is being used in combination with its economical efficiency. A method of mixing the formula (1) and the formula (3) below is disclosed in JP-A-62-15636.
7 is known.

[0005]

[Chemical 5]

However, the monoazo dye of the formula (1) has a C.I. I. It has the drawback of being inferior to Disperse Blue 56. Dyes having poor pH dependence cause a large change in the color tone of the dyed product caused by the change in the pH of the dyeing bath, and therefore the dyeing reproducibility is poor and the dyeing process is likely to cause troubles. For this reason, the clear hue (blue) of the monoazo dye of the formula (1) is commercially available.
It has been desired to develop a method for improving the pH dependency while maintaining the above.

[0007]

Problems to be Solved by the Invention C. I. It is desired to develop a method for improving the pH dependency of the azo blue dye of the formula (1) having a clear blue color tone equivalent to that of Disperse Blue 56.

[0008]

The inventors of the present invention have accomplished the present invention as a result of intensive studies to solve the above-mentioned problems. That is, the present invention is: Dye composition comprising a dye represented by formula (1) or formula (2)

[0009]

[Chemical 6]

[0010]

[Chemical 7]

(In the formula (2), X represents a chlorine atom, a bromine atom or an iodine atom, and R represents a methyl group or an ethyl group). The dyes represented by the formulas (1) and (2) in the preceding paragraph 1 and the following formula (3)

[0012]

[Chemical 8]

2. A dye composition containing a dye represented by 1 to 90% by weight, 1 to 80% by weight, and 0 to 90% by weight of the dyes represented by the formula (1) and the formula (2) in the preceding paragraph 1 and the formula (3) in the preceding paragraph 2 are contained, respectively. Characteristic dye composition 4. There is provided a method for dyeing a hydrophobic fiber, which comprises using the dye composition according to the above 1, 2, or 3.

The present invention will be described in detail. Compared to the case where the dye represented by the formula (1) is dyed by using the dye represented by the formula (1) alone by mixing the dye represented by the formula (2) and optionally the dye represented by the formula (3), It was found that the pH dependence was considerably improved, and anthraquinone-based blue dyes (for example, C.I.
Lighter results were obtained compared to the pH dependence of Disperse Blue 56). Moreover, the dyed product dyed with the dye composition of the present invention has the same sharpness and fastness to sublimation as the dyed product dyed only with the dye of the formula (1). It is robust enough to replace.

The proportion of the dye used in preparing the dye composition of the present invention is preferably 1 to 90% by weight, more preferably 10 to 60% by weight, for the dye represented by the formula (1),
The dye represented by formula (2) is preferably 1 to 80% by weight, more preferably 1 to 50% by weight, and the dye represented by formula (3) is preferably 0 to 90% by weight, more preferably 10 to 50% by weight.
% By weight. The dye composition having such a composition gives particularly preferable results in terms of pH dependence and color tone.

Specific examples of the dye of formula (2) used in the present invention include

[0017]

[Chemical 9]

[0018]

[Chemical 10]

[0019]

[Chemical 11]

[0020]

[Chemical formula 12]

And the like. You may use these in mixture of 2 or more types. Next, a method for preparing the dye composition of the present invention will be described. The dye represented by the formula (1) is 3-
6275 and the dye represented by the formula (3) are disclosed in Japanese Examined Patent Publication No.
Further, the dyes represented by formula (2) are known from JP-B No. 4-24707 and JP-B-41-6910, so that a bulk dye powder is first prepared by them, and then the formula (1), the formula (2) and optionally the formula (3) The raw dye powder is mixed and subjected to fine particle treatment by a conventional method to obtain the dye composition of the present invention. As another method, the dye powder of the formula (1), the formula (2) and the formula (3) is separately subjected to fine particle treatment by a conventional method, and the obtained fine particle dye is mixed to obtain the dye of the present invention. A composition may be obtained. In this case, they may be mixed in a dye bath. In the dyeing method of the present invention, the finely-divided dye may be dyed in a paste form without being dried. The dye composition of the present invention may be mixed with other dyes within a range not impairing the gist of the present invention.

Specific examples of the hydrophobic fibers which can be dyed by the dyeing method of the present invention include polyester fibers, polyamide fibers, diacetate fibers, triacetate fibers and their blended products, such as cotton, silk and wool. It may be a blended product with the natural fiber. In order to dye hydrophobic fibers using the dye composition of the present invention, the fibers are immersed in an aqueous solvent under pressure at 105 ° C. or higher, preferably 110-
It is advantageous to dye at 140 ° C. It is also possible to dye at a relatively high temperature, for example in the boiling state of water, in the presence of a carrier such as O-phenylphenol or chlorobenzene. Alternatively, so-called thermosol method dyeing, in which the dispersion of the dye composition of the present invention is put on a cloth and dry heat treatment is performed at 150 to 230 ° C. for 30 seconds to 1 minute, is also possible. On the other hand, together with the dye composition of the present invention and a natural sizing agent (for example, sodium alginate, starch, casein, gelatin, etc.), a synthetic sizing agent (for example, polyvinyl alcohol, polyvinyl acetate, etc.), an anti-reducing agent, a pH adjusting agent, a deep-dyeing agent, etc. A printing paste may be prepared and dyeing may be performed by a printing method according to a conventional method. It is also possible to dye from a dye bath mainly containing an organic solvent such as trichlorethylene or perchlorethylene. (Solvent dyeing)

In order to show that the dyeing method of the present invention is extremely excellent in improving the pH dependence, the formula (1) alone, the mixture of the formulas (1) and (3), and the formula (1) and the formula are described. (2)
And the formula (3) were used for dyeing, and the pH dependence was compared, and the results are shown in Table 1.

[0024]

As the test dye, 3 parts of the dye bulk powder mixed in the ratio shown in Table 1 was subjected to fine particle treatment using 7 parts of a formalin condensate of naphthalenesulfonic acid and a sand grinder, and dried by a vacuum drying method. I used one.
The dyeing conditions are as follows. Dyeing object: Polyester processed yarn fabric Dyeing density: 1.0% (owf) Bath ratio: 1:30 Dyeing bath pH: 4.5 7.0 8.0 8.0 Dyeing temperature * time: 130 ° C * 60 minutes Post-dyeing treatment : Reduction cleaning

The evaluation of the pH dependence was carried out by visually judging the degree of change in the color tone of the dyed product at the dye bath pH 7.0 and 8.0 with the color tone of the dyed bath pH 4.5 as a standard. Display symbol ◎: No difference at all △: Clear difference is recognized ×: Significant difference

As is clear from the results of Table 1, the formula (1)
By adding the dye of formula (5) to the dye of formula (1) or the dyes of formula (1) and formula (3), excellent pH dependence was exhibited.
Further, as shown in Table 1, those containing 40% by weight of the dye of the formula (5) exhibited properties comparable to those of Blue 56. This shows that the dye composition of the present invention can replace the expensive anthraquinone blue dye.

EXAMPLES The present invention will be described in more detail with reference to the following examples. In addition, "part" and "%" in an Example mean a weight part and weight%, respectively.

Example 1 1.8 parts of the dye of the formula (1) and 1.2 parts of the dye of the formula (5) were microparticulated together with 7 parts of a formalin condensate of naphthalenesulfonic acid and dried, and then the dye composition of the present invention. I got a thing. 2 parts of this dye composition was added to 3000 parts of water to form a dispersion, which was then adjusted to pH 8 with acetic acid, 100 parts of polyester white cloth was dipped and dyed at 130 ° C. for 1 hour, then the dyed cloth was subjected to reduction washing and dried. By doing so, a very clear blue dyed cloth was obtained. This dyed cloth also had good fastness to sublimation. When the dyeing bath was dyed at pH 4.5 by the same method, the same color tone was exhibited.

Example 2 0.9 parts of the dye of the formula (1), 0.9 part of the dye of the formula (5) and 1.2 parts of the dye of the formula (3) together with 7 parts of a formalin condensate of naphthalenesulfonic acid are finely divided. The dye composition of the present invention was obtained after chemical treatment and drying. When dyeing was carried out in the same manner as in Example 1, a clear blue dyed cloth was obtained. Further, when the dyeing bath was dyed at pH 4.5 by the same method, the same color tone was exhibited.

Example 3 Using 1.9 parts of the dye of formula (4) in place of the dye of formula (5) in Example 1, the same process as in Example 1 was carried out to obtain a clear blue dyed fabric. Further, when the dyeing bath was dyed at pH 4.5 by the same method, a dyed cloth having a color tone similar to the above was obtained.

Example 4 Dyeing was carried out in the same manner as in Example 2 except that 0.9 part of the dye of formula (6) was used in place of the dye of formula (5) in Example 2, and a clear blue dyeing was obtained. A cloth was obtained. Further, when the dyeing bath was dyed at pH 4.5 by the same method, a dyed cloth having a color tone similar to the above was obtained.

[0033]

By the dyeing method using the dye composition of the present invention, it is possible to improve the pH dependence of a specific cyanoazo dye without losing the sharpness of the hue.

Claims (4)

[Claims] 1. A dye composition containing a dye represented by the formula (1) or (2). [Chemical 2] (In the formula (2), X represents a chlorine atom, a bromine atom or an iodine atom, and R represents a methyl group or an ethyl group). 2. A dye represented by formula (1) or formula (2) and a formula (3) below: A dye composition containing a dye represented by 3. A dye represented by the formula (1) or (2) in claim 1 or the dye represented by the formula (3) in claim 1 is 1 to 3, respectively.
90% by weight, 1 to 80% by weight, 0 to 90% by weight, and a dye composition 4. A method for dyeing a hydrophobic fiber, which comprises using the dye composition according to claim 1, claim 2 or claim 3.