JPH07278460A - Dye composition and method for dyeing hydrophobic fiber therewith - Google Patents

Abstract

PURPOSE:To obtain a dye compsn. which is suitable for dyeing hydrophobic fibers, esp. polyethylene terephthalate fibers, is excellent in fastness, and exhibits excellent built-up properties and percentage exhaustion in deep-color dyeing by mixing two specific disperse dyes. CONSTITUTION:This dye compsn. contains dyes of formulas I and II, pref. in a wt. ratio of (5/95)-(95/5), still pref. (15/85)-(85/15). The compsn. contg. the two dyes in the wt. ratio mentioned above provides esp. pref. results in percentage exhaustion and color tone in dyeing with the compsn. alone or together with another dye. The dyeing method using the compsn. improves the otherwise low percentage exhaustion of the former dye without detriment to its fastness.

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, it has a specific structure suitable for dyeing hydrophobic fibers, especially polyethylene terephthalate fibers.
TECHNICAL FIELD The present invention relates to a dye composition containing various disperse dyes and a method for dyeing hydrophobic fibers using the same.

[0002]

2. Description of the Related Art Hydrophobic fibers, especially polyethylene terephthalate fibers, are dyed in dark blue, and especially in dark blue, because of the large amount of dye used, the fastness of each dyed product is good, especially the wet fastness after dyeing and processing. Build-up property and high dye utilization rate (exhaust property) are required. In recent years, in particular, from the viewpoint of energy saving, there has been an increasing demand for lowering the coloring temperature during dyeing or printing and shortening the dyeing time.

In the case of dyeing black with a disperse dye, it is common to use a blue or navy blue dye in combination with other yellow or red dyes. At this time, the main component of the dark blue dye is used. Good build-up and exhaustion are important.

The monoazo dyes of the following formulas (1) and (2) used in the present invention are known. That is, Japanese Patent Publication 45-
The dye of the formula (1) is described in No. 12035, and the dye of the formula (2) is described in JP-B-41-5468. However, when these dyes are used individually, they do not show good dyeing property to hydrophobic fibers, especially polyethylene terephthalate fiber, and especially in deep dyeing, build-up property and dyeing ratio. Is not sufficient and various requirements in dyeing processing cannot be sufficiently satisfied.

[0005]

There is a demand for the development of a dye which has excellent build-up properties and dyeing rate in dark color dyeing without sacrificing various fastnesses.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to develop a dark blue dye satisfying both fastness and economical efficiency in such deep color dyeing, and arrived at the present invention. That is, the present invention provides a dye composition containing (1) a dye represented by the formula (1) and a dye represented by the formula (2).

[0007]

[Chemical 2] (2) Dye 5 represented by the formula (1) in the above item (1)
To 95 parts by weight and 95 to 5 parts by weight of the dye represented by the formula (2), the dye composition according to the above (1) (2) The dye composition according to the above (1) or (2). The present invention relates to a method for dyeing a hydrophobic fiber used.

By using the dye of the formula (1) and the dye of the formula (2) in combination, the dyeing ratio is greatly increased as compared with the case of dyeing only with the dye of the formula (1) or (2). A completely unexpected phenomenon of improvement was observed. Similarly, the build-up property is also good. Moreover, the dyed product dyed with the dye composition does not impair various fastnesses when dyed with the dye represented by the formula (1) or (2) alone, and also from the economical viewpoint. The practical value of is extremely high.

A preferred mixing ratio of the dyes mixed in the method of the present invention is 5 to 95% by weight, more preferably 15 to 85% by weight of the dye represented by the formula (1), and the formula (2). The dyeing amount is preferably when the dye is mixed in an amount of 95 to 5% by weight, more preferably 85 to 15% by weight, and when the composition is used alone or when the composition is used in combination with another dye. It gives particularly preferable results in terms of color tone.

The dye composition used in the present invention is prepared as follows. The bulk powder of the dye represented by the formula (1) is prepared by the method described in JP-B-45-12035, and the bulk powder of the dye represented by the formula (2) is prepared in the JP-B-41-54.
It is easily manufactured by the known method described in No. 68 and the like.
The dye bulk powder thus obtained may be mixed in the above-mentioned proportions and subjected to microparticulation treatment (dispersion) to obtain a dye composition, or represented by formula (1) and formula (2). Each of the bulk dye powders may be separately finely divided and then mixed.
Alternatively, in the latter case, the finely divided dyes may be added to the dyeing bath or the printing paste to form the same composition as the dye composition of the present invention in the dyeing bath or the printing paste.

In order to apply such a dye composition to dyeing, these dye compositions are used together with a general dispersant in the form of fine particles in a wet state and finely dispersed to be used for dyeing.
For example, the dye bulk powders of the formulas (1) and (2) or a mixture of the dye bulk powders may be used as an anionic dispersion of a naphthalenesulfonic acid formalin condensate, an alkylnaphthalenesulfonic acid formalin condensate, or ligninsulfonic acid. Agent, or a nonionic dispersant such as a block copolymer of ethylene oxide and propylene oxide or an ethylene oxide adduct of alkylphenol (for example, the dispersant is used in a weight ratio of 1 to 5 times that of the bulk powder) and a small amount A sufficient amount of water is added, and the mixture is sufficiently wet pulverized using a rye crusher, a sand mill, a sand grinder or the like, and is directly used as a paste product or dried by spray drying or the like to be used as a fine particle dye of a dry product. Dye bulk powder (1),
When (2) is separately subjected to the microparticulation treatment by the above method, the microparticulate dye is mixed in advance or at the time of preparation of the dyebath to prepare a dyebath, and the dyebath is provided for dyeing.

In addition to the mixed composition of the dyes represented by the formulas (1) and (2) used in the present invention, in order to adjust to a desired hue or to further improve fastness and dyeability. It is also possible to mix and use several kinds of existing disperse dyes.
Also in this case, the bulk powder of dye may be mixed in advance and then made into fine particles, or each dye may be finely dispersed and then blended and used for dyeing.

Specific examples of the hydrophobic fiber which can be dyed by the method of the present invention include polyethylene terephthalate fiber, polyamide fiber, cellulose diacetate fiber, cellulose triacetate fiber and blended products thereof.
It may be a blended product of these and recycled fibers such as rayon or natural fibers such as cotton, silk and wool.

To dye a hydrophobic fiber with a dye composition comprising a dye represented by the formula (1) or (2),
It is advantageous to dye the fibers in an aqueous solvent in which they are immersed under pressure at 105 ° C. or higher, preferably 110 ° C. to 140 ° C.
It is also possible to dye in the presence of a carrier such as o-phenylphenol or trichlorobenzene at a relatively high temperature, for example, boiling water. Alternatively, so-called thermosol method dyeing is also possible in which the dye dispersion is padded on a cloth and subjected to dry heat treatment at 150 to 230 ° C. for 30 seconds to 1 minute. On the other hand, the dye composition of the present invention contains a natural sizing agent (eg, locust bean gum, guar gum, etc.), a chemical sizing agent (eg, fiber derivative such as carboxymethyl cellulose, a chemical locust bean gum, etc.), a synthetic sizing agent (eg, polyvinyl alcohol, polyvinyl). It is also possible to prepare a printing paste together with (acetic acid, etc.), etc., print on a cloth, and then perform dyeing by a printing method of steaming or thermosol treatment.

In order to show that the dyeing method of the present invention is extremely excellent in improving the dyeing rate, dyeing with the dye of the formula (1) or (2) alone and dyeing with the dyeing method of the present invention Table 1 shows a comparison of the dyeability in the case of doing. First
In the table, the amount used is shown in parts by weight.

[0016]

[Table 1] Table 1 Amount of single or mixed dye used (Note 1) Dyeing rate (Note 2) Single-1 Formula (1) 8 76.5% Single-2 Formula (2) 8 57.1 bottles Method-1 of the invention Formula (1) 6.4 Formula (2) 1.6 88.2 Method of the invention-2 Formula (1) 4.8 Formula (2) 3.2 85.1 Method of the invention- 3 Formula (1) 3.2 Formula (2) 4.8 78.3

(Note 1) As test dyes, all of the dye powder (content 30%) is formalin condensate of naphthalenesulfonic acid, which is wet-particulated (dispersed) using a sand grinder and vacuum dried. The dried one was used. The "methods 1 to 3 of the present invention" are vacuum-dried products of mixed dyes obtained by mixing dyes (raw powder) in a predetermined ratio and then subjecting them to fine particle treatment (dispersion). The dyeing conditions are as follows. Dyeing object: Tetoron (polyethylene terephthalate fiber) processed white cloth Bath ratio: 1:30 Temperature, time: 130 ° C, 60 minutes Dyeing bath pH: 4.5 (acetic acid-sodium acetate buffer) (Note 2) Measurement of dyeing rate The ratio of the dye content (dyed amount) dyed to the amount of dye used in the above dyeing method was expressed as dye amount. The dyeing amount depends on the amount of dye used and the amount of dye remaining in the dyeing bath after dyeing and the dyed cloth are 75% acetone aqueous solution at 20 ° C.
It is obtained by subtracting the dye component from the treatment liquid obtained by treating for 0 minutes. In these, the concentration of the dye was determined by a method of measuring the optical density using a 75% acetone aqueous solution. As can be seen from the table, the dyeing rate according to the method of the present invention is much higher than that when dyed with the dye of formula (1) or (2) alone. Thus, in the case of following the present invention, various dyeing methods, for example, showing extremely good dyeing property in general exhaust dyeing, as a result, waste water of dyeing is small, and in printing dyeing, high fixing property is exhibited,
Since there are few unfixed dyes, economic efficiency such as simplification of washing process after printing can be obtained, and the dyed products produced have extremely good various fastnesses, especially in wet fastness after dyeing and processing. Shows excellent robustness.

[0018]

The present invention will be described in more detail with reference to the following examples. In the examples, parts and% are parts by weight and% by weight, respectively.
Indicates.

Example 1 2.4 parts of a dye (bulk powder) represented by the formula (1) and 0.6 part of a dye (bulk powder) represented by the formula (2) were added to 7 parts of a formalin condensate of naphthalenesulfonic acid. A dye composition was obtained by atomizing (dispersing) with a rye crusher together with a small amount of water. 8 parts (8% owf) of this dye composition was added with acetic acid-sodium acetate to a pH of 4.
Pure water adjusted to 5 was added to prepare 3000 parts of dyeing bath, 100 parts of Tetoron white cloth was soaked and dyed at 130 ° C. for 60 minutes, and then the dyed product was dyed with 6 parts of 45% caustic soda and 6 parts of hydrosulfite. Part, Sanmor RC-700 (anionic surfactant, manufactured by Nika Kagaku Co., Ltd.), water was added to make a total amount of 3000 parts, and reduction soaping was performed at 80 ° C. for 10 minutes, washed with water and dried. A very dark blue dyed fabric was obtained. This dyed cloth was good in light fastness, sublimation fastness and wet fastness.

Example 2 In the same manner as in Example 1, the dye bulk powder of the formula (1) 1.
8 parts and 1.2 parts of the bulk powder of the formula (2) together with 7 parts of a formalin condensate of naphthalene sulfonic acid were made into fine particles and dyed in the same manner as in Example 1 to obtain a dark blue dyeing having a remarkably high density. A cloth was obtained.

Example 3 In the same manner as in Example 1, the dye bulk powder of the formula (1) 1.
2 parts and 4.8 parts of the bulk powder of the formula (2) were made into fine particles together with 7 parts of a formalin condensate of naphthalene sulfonic acid, and dyed in the same manner as in Example 1 to obtain a very dark blue color. A dyed fabric was obtained.

Example 4 2 parts, 4 parts respectively of the dye composition obtained in Example 1
Three dyeing baths each containing 6 parts and a total amount of 3000 parts were prepared, and then the pH was adjusted to 4.5, and Tetoron white cloth was immersed in each dyeing bath and dyed at 130 ° C. for 60 minutes. Similarly, when it was washed reductively and dried, an extremely dark navy blue dyed fabric was obtained. From the dyed fabric obtained in this example, it was confirmed that the build-up property in the dyeing method of the present invention was extremely excellent.

Example 5 Dye composition obtained in Example 1 3 parts Carboxymethyl cellulose 20% aqueous solution 60 parts Sodium chlorate 0.5 parts Tartaric acid 0.2 parts Leveling agent 2 parts Microwarm water 34.3 parts The following printing paste is prepared, printed on a polyester white cloth, intermediately dried at 80 ° C, and then heated with superheated steam at 175 ° C.
Hold for a minute, then wash with water, reduce and wash thoroughly,
Dried. A dyed product was obtained in which the portion printed with color paste was colored in dark blue. This dyed product had good sublimation fastness, light fastness, wet fastness such as water fastness.

[0024]

By the dyeing method using the dye composition of the present invention, it is possible to improve the drawback that the dyeing ratio of the dye is low without impairing the fastness of the dye represented by the formula (1). .

Claims (3)

[Claims] 1. A dye composition comprising a dye represented by formula (1) and a dye represented by formula (2): 2. The dye according to claim 1, which is 5 to 95 parts by weight of the dye represented by the formula (1) and the dye 95 to 5 represented by the formula (2).
The dye composition according to claim 1, which comprises parts by weight. 3. A method for dyeing hydrophobic fibers using the dye composition according to claim 1 or 2.