JPH06128880A - Method for darkly dyeing cellulosic fiber structure treated with liquid ammonia - Google Patents

Abstract

PURPOSE:To obtain a dyed material of high concentration having excellent fastness to dyeing by subjecting the cellulosic fiber structure treated with liquid ammonia to a specific continuous dyeing method using a middle temperature type reactive dye. CONSTITUTION:A cellulosic fiber structure treated with liquid ammonia is subjected to padding in a dyeing solution containing a middle temperature type reactive dye and an alkali agent (preferable example, sodium bicarbonate or sodium carbonate), then intermediately dried and then solidified with dry heat. Then the dyed cellulosic fiber structure is subjected to padding in an alkali solution containing an alkali agent (preferable example, sodium caustic soda or sodium silicate), solidified with steam heat, then cleaned and washed with water to give a dyed material colored in a much higher concentration than a conventional method, having excellent fastness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for deep dyeing a cellulosic fiber structure which has been treated with liquid ammonia.

[0002]

2. Description of the Related Art Cellulose fibers have advantages such as excellent hygroscopicity and water absorption, resistance to static electricity, and easy removal of stains. There are drawbacks such as poor adhesion and dimensional stability against water. As a method for improving these drawbacks, a method of treating with a caustic soda aqueous solution or liquid ammonia is known.

[0003]

[Problems to be Solved by the Invention] When a cellulosic fiber is treated with an aqueous solution of caustic soda (mercerizing),
The dyeability is greatly improved, and the dimensional stability is also improved.
On the other hand, although the dimensional stability is improved by the liquid ammonia treatment, there is a problem that the dyeability is inferior to that of the caustic soda treatment, especially when the reactive dye used in most cotton dyeing is applied.

In recent years, there has been an increasing demand for products having a soft texture obtained by subjecting cellulosic fibers to liquid ammonia treatment and having less wrinkles and shrinkage after washing.

It is an object of the present invention to provide a method for performing dark color dyeing of good quality on a cellulosic fiber structure treated with liquid ammonia at low cost.

[0006] Therefore, in order to solve these problems, the present inventor has improved the dyeing property of the dye and has a fast color fastness for the dark color dyeing of the cellulosic fiber structure treated with liquid ammonia. As a result of extensive studies on a method capable of carrying out the present invention, the present invention has been completed this time.

[0007]

DISCLOSURE OF THE INVENTION According to the present invention, after applying a medium temperature type reactive dye and an alkaline agent to a cellulosic fiber structure which has been treated with liquid ammonia, it is treated with an alkaline solution and fixed, before impregnation with the alkaline solution. In addition, the cellulosic fiber structure provided with the reactive dye is subjected to a dry heat fixing treatment, and after impregnating with an alkali solution, the fiber structure is subjected to a steam heat fixing treatment. The present invention provides a method for thickening a cellulosic fiber structure subjected to.

The present invention will be described in more detail below.

In the present specification, the "cellulosic fiber structure" includes yarns, woven and knitted fabrics, non-woven fabrics and the like made of natural or regenerated cellulose fibers such as cotton, hemp and rayon.
The fibrous structure may include other natural, semi-synthetic or synthetic fibers such as polyester, polyamide and the like.

The method of the present invention is a method of fixing a medium-temperature type reactive dye to a cellulosic fiber structure treated with liquid ammonia in an alkaline manner before and after impregnation with an alkali solution, respectively, by dry heat fixing. It is characterized in that it is subjected to treatment (baking) and steam fixation treatment (steaming), and continuous dyeing is possible. An example of the dyeing process is shown below.

[0011]

[Table 1]

In the method of the present invention, a medium temperature type reactive dye is used for dyeing the cellulosic fiber structure. Here, the "medium temperature type reactive dye" is a dye having a moderate reactivity with a cellulosic fiber, and includes, for example, a monofluorotriazine type, a sulfatoethylsulfone (vinylsulfone) type, a sulfatoethylsulfone ( A dye group such as a multifunctional type including a vinyl sulfone) group is included.

The application of such a dye to the cellulosic fiber structure can be carried out by using an aqueous solution (dyeing solution) containing the above-mentioned medium temperature type reactive dye and an alkali agent, and the dyeing solution is further, for example, to prevent migration. An agent, an anti-reducing agent, a hydrotrope agent, a penetrating / wetting agent and the like can be added as necessary.

Examples of the alkaline agent to be added to the dyeing solution include inorganic alkalis such as sodium bicarbonate, sodium carbonate, caustic soda and sodium tertiary phosphate, and preferably sodium bicarbonate and sodium carbonate. These alkaline agents are generally used in an amount of 0.2-2.0% by weight, preferably 0.5-2.0%.
It can be used in an amount within the range of 1.5% by weight.

Examples of anti-migration agents include Duck Algin NSPM (manufactured by Kibun Co., Ltd.), Diaserver MG-N (manufactured by Mitsubishi Kasei KK), Tamanori SA.
-25 (manufactured by Arakawa Chemical Industry KK) or the like can be used.

Further, as the anti-reducing agent, the hydrotrope agent and the penetrating / wetting agent, those which are commonly used in the art can be similarly used.

Examples of the method for applying the above dyeing solution to the cellulosic fiber structure include a pad method, a spray method, and a coating method.
It is suitable to carry out in the range of 100%, preferably 60 to 80%.

The cellulosic fiber structure thus provided with the dyeing solution is usually subjected to intermediate drying and then subjected to a dry heat fixing treatment according to the present invention. Intermediate drying is usually 100-1
It can be carried out by holding in a dryer at 50 ° C for about 1 to about 5 minutes, and the dry heat fixing treatment after intermediate drying is usually 120 to 200 ° C, preferably 150 to 200 ° C.
It can be carried out by holding it in a thermo unit of 170 ° C., for example, in a roller type thermosol dyeing machine or a pin tenter type heat setter for about 1 to about 6 minutes, preferably for about 2 to about 3 minutes.

The fiber structure subjected to the dry heat fixing treatment is then subjected to an impregnation treatment with an alkaline solution. The alkaline solution used in this treatment can be prepared by dissolving an alkaline agent in water together with inorganic salts such as sodium sulfate and sodium chloride, if necessary. Examples of the alkali agent that can be used here include sodium bicarbonate, sodium carbonate, caustic soda, sodium silicate, inorganic alkalis such as potassium hydroxide,
Caustic soda and sodium silicate are preferable. These alkaline agents are generally used in an amount of 0.2 to 30.0% by weight, preferably 0.1.
It can be used in a concentration within the range of 5 to 10.0% by weight.

The fixing treatment with the alkaline solution is usually performed by immersing the fibrous structure in the alkaline solution and squeezing it from 50 to 110.
%, Preferably 80 to 100%.

The fiber structure impregnated with the alkaline solution as described above is further subjected to steam fixation treatment (steaming) according to the present invention. This steam fixation process is generally
It can be carried out by exposing the fibrous structure to heated steam, for example, by treating it with atmospheric pressure saturated steam at a temperature of about 100 to about 110 ° C. for about 20 to about 60 seconds.

The fiber structure thus steam-heat-fixed can be subjected to post-treatment steps such as washing, washing with water and drying according to a conventional method, whereby it is dyed at a much higher concentration than the conventional method. It is possible to obtain a cellulosic fiber structure having excellent fastness.

[0023]

EXAMPLES Next, the present invention will be described more specifically by way of examples, but the present invention is not limited to the following examples.

Example 1 (a) Preparation of dyeing solution Dye 60 g / l Migration inhibitor 1 g / l (sodium alginate) Reduction inhibitor 10 g / l (sodium metanitrobenzene sulfonate) Sodium carbonate 10 g / l (b) Dye used (B) -a Sumifix Spra Yellow 3R
F (Reactive dye made by Sumitomo Chemical Co., Ltd., CI Reactive Yel
low 145) (b) -b Cibacron red C-2G (Ciba Geigy reactive dye, CIReactive Red 228) (b) -c Remazol blue R-KN (Mitsubishi Kasei Hoechst reactive dye, CIReactive Blue 19) (b) -D Remazol Black B (Reactive dye made by Mitsubishi Kasei Hoechst, CI Reactive Black 5) (C) Dyeing method Cotton 1 after hair-burning, desizing, scouring, bleaching and liquid ammonia processing 1
Dyeing was performed using 00% poplin (50 count single yarn, warp density 148 yarns / inch, cotton density 80 yarns / inch) under the following steps and conditions.

[0025]

[Table 2]

(D) Dyeing property evaluation method The dyeing property of the dye was evaluated by the K / S value of the dyed fabric (the higher the value, the darker).

The K / S value is the colorimeter data color 3890.
Then, the reflectance of the dyed cloth was measured, and the K / S value was calculated by the following Kubelca-Munk formula.

[0028]

[Equation 1]

R: reflectance at the maximum absorption wavelength of each dye cloth Dye a ... 420 nm, b ... 520 nm c ... 600 nm, d ... 580 nm ( E) Dyeing fastness evaluation Washing test; according to JIS L 0844 A-4 method.

Friction test; JIS L 0849 Gakushin II
According to the mold tester.

(F) Results The results are shown in Table 1 below.

Comparative Example 1 The same operation as in Example 1 was carried out except that sodium carbonate was not used in the preparation of the dye solution and the dry heat fixing step was omitted in the dyeing method. The results are shown in Table 1 below.

[0033]

[Table 3]

In each of the dyes a to d, Example 1 (the method of the present invention) is deeper than Comparative Example 1. Further, although the dyed cloth of Example 1 was darker than the dyed cloth of Comparative Example 1, both the wash fastness and the rubbing fastness were equivalent or higher.

Example 2 and Comparative Example 2 Cotton after hair-burning, desizing, scouring, bleaching and liquid ammonia processing
Using hemp blend (blend ratio 50:50) sackcloth (20 count single yarn, warp density 60 yarns / inch, weft density 60 yarns / inch)
The same operation as in Example 1 and Comparative Example 1 was performed.

The results are shown in Table 2.

[0037]

[Table 4]

Claims (1)

[Claims] 1. A method of applying a medium temperature type reactive dye and an alkali agent to a cellulosic fiber structure treated with liquid ammonia, followed by treatment with an alkali solution to fix the same, before the impregnation treatment with the alkali solution. Cellulose treated with liquid ammonia characterized by subjecting a cellulose-based fiber structure to which a dye is applied to a dry heat fixing treatment, and after impregnating an alkaline liquid, the fiber structure is subjected to a steam heat fixing treatment. Method for thickening dye-based fiber structure.