JPH0657658A - Method for deeply dyeing cellulosic fiber structure - Google Patents

Abstract

PURPOSE:To obtain a high-quality deeply dyed material in dyeing a cellulosic fiber structure, not subjected to mercerization, with reactive dye of middle temperature type, by subjecting the cellulosic fiber structure to dry heat retention treatment and steam heat retention treatment. CONSTITUTION:After a cellulosic fiber structure not subjected to mercerization is provided with reactive dye of middle temperature type and before undergoes retention treatment with an alkali agent, the cellulosic fiber structure is subjected to dry heat retention treatment (120-200 deg.C), then impregnated with an alkali solution containing preferably sodium bicarbonate or sodium carbonate and subjected to steam heat retention treatment at 100-110 deg.C to give a deeply dyed material having excellent selective fastness and fastness to friction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dark dyeing method for a cellulosic fiber structure which has not been subjected to a mercerizing process.

[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. On the other hand, bleaching provides sufficient concentration. It has the drawback that it cannot be dyed. As a method for improving this drawback, a mercerizing process with an aqueous solution of caustic soda is widely known.

However, in recent years, there has been an increasing demand for products which do not carry out mercerizing processing on cellulosic fibers and appeal to the full texture inherent in these fibers.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention Conventionally, in the case of deeply dyeing a cellulosic fiber that has not been subjected to a mercerizing process, a large amount of dye has been used because the dyeability of the dye is poor. For this reason, the dye cost increases significantly,
There have been problems such as unfixed dye adhering to the fiber surface and the dyeing fastness decreasing.

Therefore, in order to solve these problems, the present inventor has improved the dyeing property of a dye to a cellulosic fiber structure which has not been subjected to a mercerization process and has an excellent fastness. As a result of extensive studies on a method of performing color dyeing, the present invention has been completed.

[0006] It is an object of the present invention to provide a method for performing dark color dyeing of good quality at low cost on a cellulosic fiber structure which has not been subjected to a mercerizing process.

[0007]

DISCLOSURE OF THE INVENTION In the present invention, after applying a medium temperature type reactive dye to a cellulosic fiber structure which has not been subjected to a mercerization process, and treating with an alkali solution to fix the dye, the reaction is carried out before the impregnation with the alkali solution. A non-mercerized cellulosic material characterized by subjecting a cellulosic 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. The present invention provides a method for thickening a fiber structure.

The present invention will be described in more detail below.

In the present specification, “mercerization”
Refers to a process for improving dyeability using an aqueous solution of caustic soda or an aqueous solution of potassium caustic.

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, and the fiber structure is polyester. , Other natural, semi-synthetic or synthetic fibres, such as polyamides.

The method of the present invention is a method of fixing a medium temperature type reactive dye to an unmercerized cellulosic fiber structure in an alkaline manner, before and after impregnation with an alkaline liquid, respectively. (Baking) and steam fixation (steaming) are featured, and continuous dyeing is possible. An example of the dyeing process is as follows.

[0012] 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 is, for example, a monofluorotriazine type, a sulfatoethylsulfone (vinylsulfone) type, a sulfatoethylsulfone. Examples include dye groups such as polyfunctional type containing (vinyl sulfone) groups.

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.

Alkali agents that can be added to the dyeing solution include
Examples thereof include inorganic alkalis such as sodium bicarbonate, sodium carbonate, caustic soda, and tertiary sodium phosphate, and preferably sodium bicarbonate and sodium carbonate. These alkaline agents are generally used in an amount of 0.2 to 2.0% by weight, preferably 0.5.
It can be used in an amount in the range of up to 1.5% by weight.
Examples of anti-migration agents include Datsukarugin NSPM (manufactured by Kibun Co., Ltd.) and Diaserver MG.
-N (manufactured by Mitsubishi Kasei Kogyo KK), Tamanori SA-25 (manufactured by Arakawa Chemical Industry KK) and 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. For example, in the case of the pad method, the squeezing ratio is generally 40 to 40.
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 the dry heat fixing treatment according to the present invention. Intermediate drying is usually 100
It can be carried out by holding in a dryer at ~ 150 ° C for about 1 to about 5 minutes, and the dry heat fixing treatment after intermediate drying is usually 120 to 200 ° C, preferably 160 ° C.
It can be carried out by holding it in a thermounit of ~ 170 ° C, for example, in a roller type thermosol dyeing machine or a pintenter type heat setter for about 1 to about 6 minutes, preferably about 2 to about 3 minutes.

The dry heat set fiber structure is then
It is subjected to 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 alkaline agent that can be used here include inorganic alkalis such as sodium bicarbonate, sodium carbonate, caustic soda, sodium silicate, and potassium hydroxide, and caustic soda and sodium silicate are preferable.
These alkaline agents can be used generally in a concentration within the range of 0.2 to 30.0% by weight, preferably 0.5 to 10.0% by weight.

The fixing treatment with the alkaline liquid is usually performed by immersing the fibrous structure in the alkaline liquid and squeezing it to a draw ratio of 50 to 110.
%, Preferably 80 to 100%.

The fiber structure thus impregnated with the alkaline liquid is further subjected to steam fixation treatment (steaming) according to the present invention. This steam fixation treatment can generally be carried out by exposing the fiber 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 10 seconds. Can be done.

The steam-heat-fixed fiber structure can be subjected to post-treatment steps such as washing, washing with water and drying according to a conventional method, which allows dyeing at a much higher concentration than in the conventional method. The cellulosic fiber structure having excellent fastness can be obtained.

[0022]

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 (sodium alginate) 1 g / l Reduction inhibitor (sodium metanitrobenzenesulfonate) 10 g / l Sodium carbonate 10 g / l (b) Use Dye (b) -a Sumifix Supra Yellow 3RF
(Sumitomo Chemical KK made reactive dye, CI Reactive Yellow
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, CIReactive Black 5) (C) Dyeing method 100% cotton poplin (50 count single yarn, warp density 148 yarns / inch, after tanning, desizing, scouring, and bleaching) Weft density 80
Dyes / inch) were dyed under the following steps and conditions.

[0024] (D) Dyeing property evaluation method The dyeing property of the dye was evaluated by the K / S value of the dyed cloth (the higher the value, the darker the color).

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

[0026] Dye a ... 420 nm, b ... 520 nm c ... 600 nm, d ... 580 nm (e) Dyeing fastness evaluation Washing test; JIS L 0844 A-4 method.

Friction test; JIS L 0849 Gakken I
According to type I testing machine.

(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.

[0030]

[Table 1]

In each of dyes a to d, Example 1 (the method of the present invention) was 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 Wool-burning, desizing, scouring, and bleaching-processed cotton-hemp blend (mixing ratio 5
(0:50) Using a sack cloth (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.

[0034]

[Table 2]

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Claims (1)

[Claims] 1. When a medium-temperature type reactive dye is applied to a cellulosic fiber structure which has not been subjected to a mercerization process and then treated with an alkaline solution to fix the same, the reactive dye is applied before impregnation with the alkaline solution. A non-mercerized cellulosic fiber structure, characterized by subjecting the cellulosic fiber structure to a dry heat fixing treatment and impregnating with an alkali solution, and then subjecting the fiber structure to a steam heat fixing treatment. Darkening method.