JP2731091B2 - Method for thickening cellulosic fiber structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dark-coloring cellulosic fiber structures which have not been subjected to mercerizing.

[0002]

2. Description of the Related Art Cellulosic fibers have the advantages of being excellent in hygroscopicity and water absorption, being less likely to generate static electricity, and being easier to remove dirt. There is a disadvantage that dyeing cannot be performed. As a method for remedying this defect, mercerizing with an aqueous solution of caustic soda or the like is widely known.

[0003] In recent years, however, there has been an increasing demand for products that do not carry out mercerizing processing on cellulosic fibers and that appeal to the plump texture inherent in them.

[0004]

[Problems to be Solved by the Invention] Conventionally, when dyeing a cellulosic fiber which has not been subjected to a mercerizing treatment in a deep color, the dye is poor in dyeing properties, so that a large amount of the dye has been used. Therefore, the the dyeing cost increases significantly,
Unfixed dyes adhere to the fiber surface, causing problems such as a decrease in color fastness.

[0005] In order to solve these problems, the inventor of the present invention has improved the dyeing property of a cellulosic fibrous structure that has not been subjected to mercerizing and improved the fastness of the dye. As a result of intensive studies on the method of performing color dyeing, the present invention has been completed.

An object of the present invention is to provide a low-cost, high-quality, high-quality dyeing method for a cellulosic fiber structure that has not been subjected to mercerizing.

[0007]

DISCLOSURE OF THE INVENTION The present invention relates to a method of applying a medium-temperature reactive dye to a cellulosic fibrous structure which has not been subjected to mercerization treatment, and then fixing the dye with an alkaline solution before the impregnation with the alkaline solution. Applying a dry heat fixing treatment to the cellulosic fibrous structure to which the dye has been applied, and impregnating with an alkali solution, and then subjecting the fibrous structure to a steam fixing treatment, wherein the cellulosic fibrous structure is not subjected to a mercerizing treatment. An object of the present invention is to provide a method for thickening a fiber structure.

Hereinafter, the present invention will be described in more detail.

In the present specification, “mercerize processing”
The term "processing" refers to a process for improving dyeing properties using an aqueous solution of caustic soda or an aqueous solution of caustic potassium.

[0010] In the present specification, the term "cellulosic fibrous structure" includes yarns, woven and knitted fabrics, and nonwoven fabrics made of natural or regenerated cellulose fibers such as cotton, hemp, and rayon. , Polyamides and other natural, semi-synthetic or synthetic fibers.

The method of the present invention is a method for fixing a medium-temperature type reactive dye to a cellulosic fibrous structure which has not been subjected to mercerization processing in an alkaline manner. (Baking) and steam fixation (steaming) are performed. 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 degree of reactivity with cellulosic fibers, such as monofluorotriazine, sulfatoethylsulfone (vinylsulfone), and sulfatoethylsulfone. A dye group such as a polyfunctional dye having a (vinyl sulfone) group is exemplified.

The application of such a dye to the cellulosic fiber structure can be carried out using an aqueous solution (dying solution) containing the above-mentioned intermediate-temperature type reactive dye and an alkali agent. An agent, a reduction inhibitor, a hydrotrope, a penetrating / wetting agent, and the like can be added as necessary.

[0014] Alkali agents that can be incorporated into the dyeing solution include:
Examples thereof include inorganic alkalis such as sodium bicarbonate, sodium carbonate, caustic soda, and sodium tertiary phosphate, preferably sodium bicarbonate and sodium carbonate. These alkaline agents are generally present 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 ~ 1.5% by weight.
Examples of the migration inhibitor include Datsuk Algin NSPM (manufactured by Kibun Corporation) 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.

As the reduction inhibitor, hydrotropic agent and penetrating / wetting agent, those commonly used in the art can be used in the same manner.

Examples of a method for applying the above-mentioned dyeing solution to the cellulosic fiber structure include a padding method, a spraying method, and a coating method.
Suitably, it is performed within 100%, preferably within the range of 60-80%.

The cellulosic fibrous structure to which the dyeing liquid has been applied in this way is usually subjected to a dry heat fixing treatment according to the present invention after intermediate drying. Intermediate drying is usually 100
The drying can be carried out by holding the film in a dryer at a temperature of about 150 to 150 ° C. for about 1 to about 5 minutes.
It can be carried out by holding the mixture in a thermounit at -170 ° C, for example, 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
It is subjected to an alkali liquid impregnation treatment. The alkaline liquid used in this treatment can be prepared by dissolving an alkaline agent in water together with an inorganic salt such as sodium sulfate and salt as needed. Examples of the alkali 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 at a concentration generally in the range of 0.2 to 30.0% by weight, preferably 0.5 to 10.0% by weight.

In this fixing treatment with an alkaline solution, the fiber structure is usually immersed in an alkaline solution, and a squeezing ratio of 50 to 110 is used.
%, Preferably within the range of 80 to 100%.

The fiber structure impregnated with the alkaline liquid in this manner is further subjected to a steam fixing treatment (steaming) according to the present invention. The steaming fixing process can generally be carried out by exposing the fiber structure to the heating steam, for example, treating about 20 to 10 0 sec with normal pressure saturation steam temperature of about 100 to about 110 ° C. Can be performed.

The fibrous structure thus heat-fixed can be subjected to post-treatment steps such as washing, washing and drying according to a conventional method, so that it is dyed at a much higher concentration than the conventional method. It is possible to obtain a cellulosic fibrous structure having excellent durability.

[0022]

EXAMPLES Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to only 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) Dye (b) -a Sumifixus Supra Yellow 3RF
(Reactive dye manufactured by Sumitomo Chemical KK, CIReactive 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 (Mitsubishi Kasei Hoechst reactive dye, CIReactive Black 5) (c) Dyeing method 100% cotton poplin (50-count single yarn, density 148 / inch, after baking, desizing, scouring, bleaching) Weft density 80
The dyeing | staining was performed using the following process and conditions.

[0024] (D) Dyeability evaluation method The dyeability of the dye was evaluated by the K / S value of the dyed cloth (the larger the value, the darker).

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

[0026] Dyes a ... 420 nm, b ... 520 nm c ... 600 nm, d ... 580 nm (e) Evaluation of color fastness Washing test: According to JIS L 0844 A-4 method.

Friction test: JIS L 0849 Gakushin I
According to an I-type 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 drying fixation step was omitted in the dyeing method. The results are shown in Table 1 below.

[0030]

[Table 1]

In all of the dyes a to d, Example 1 (the method of the present invention) was more deeply dyed than Comparative Example 1. Further, the dyed fabric of Example 1 had the same or higher performance in both the washing fastness and the rub fastness, though it was darker than the dyed fabric of Comparative Example 1.

Example 2 and Comparative Example 2 Cotton-linen blended spinning after blending, desizing, scouring and bleaching (mixing ratio 5
0:50) The same operation as in Example 1 and Comparative Example 1 was performed using a sackcloth (20-count single yarn, warp density 60 yarns / inch, weft density 60 yarns / inch).

The results are shown in Table 2.

[0034]

[Table 2]

Claims (1)

(57) [Claims] 1. A medium-temperature type reactive dye is applied to a cellulosic fibrous structure that has not been subjected to mercerization, and then treated with an alkali solution to fix the reactive dye.
It is applied as a dyeing solution containing the alkaline agent , and before the impregnation treatment with the alkali solution, the cellulosic fiber structure to which the reactive dye is applied is subjected to a dry heat fixing treatment, and after the impregnation treatment with the alkali solution, A method for deep-dyeing a cellulosic fibrous structure that has not been subjected to mercerization, wherein the fibrous structure is subjected to a steam fixing treatment.