JPH08209560A - Finishing faded from repeated washing of cellulosic-based fiber structural material - Google Patents

Abstract

PURPOSE: To obtain a dyed material faded from repeated washing by dip-dyeing or printing a cellulosic fiber structural material with a dyeing solution composed of a threne dye, a wetting agent and a reduction agent, and then heat-treating and washing. CONSTITUTION: A cotton satin fabric is singed, desized scoured and bleached, padded or printed with a dyeing solution composed of a threne dye, a wetting agent such as polyethylene glycol and a reducing agent such as hydrosulfite, dried to a certain extent strongly attach the threne dye, which become to vat acid in the presence of the reducing agent, on the surface of fiber by an action of the wetting agent. The resultant fabric is treated with steam using ager, washed in warm water and fresh water to partially remove the threne dye, then the objective dyed material is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing and finishing method of a cellulosic fiber structure.

[0002]

2. Description of the Related Art Generally, it is desired that a dyed or printed product has little discoloration after repeated washing, that is, it should be dyed firmly so as not to be washed. However, in the fashion trends of young people these days, the feeling of being washed or worn is preferred, such as blue denim. In particular, casual pants called bleach-out denim are the twill fabric dyed with indigo dye or its sewn product that has been decolorized using a bleaching agent. Further, not only the indigo dye blue, but also color denim of various hues are washed away, that is, products that have a bleach-out feeling are becoming more and more popular.

In order to meet such demands, conventionally, after dyeing or printing with a reactive dye, chlorine is exposed, or after dyeing or printing with a slene dye and then chlorine is exposed, there are defects. . That is, in the former, the chlorine fastness of the reactive dye is generally poor, so that it is difficult to control the concentration of the dyed cloth or the printing cloth, and in the latter, the chlorine fastness is too good and the bleached-out feeling is hard to appear. In any case, the bleaching process is a batch method such as winth and takes a long time, or even the dye left unbleached because it is decolorized using a bleaching agent is affected by the bleaching agent, and the fastness is descend. or,
Since sodium hypochlorite or the like is used as a bleaching agent, there are drawbacks such as poor workability due to the problem of odor.

Further, in response to the above-mentioned demand, after dyeing or printing with a pigment, a cloth containing a ball is used for kneading. , There was a problem that it was different from the original feeling of washing.

In order to solve these problems, Japanese Patent Laid-Open Publication No.
No. 9-163491 discloses a dye, an alkali agent, a sulfinic reducing agent, and an inorganic inorganic having a reducing property, which are water-insoluble and are dissolved into a leuco compound to be dissolved and dyed on a white cloth or dyed cloth of cellulosic fibers. A method has been proposed in which a dyeing solution containing a metal compound is padded, and a dyeing cloth having a feeling of being washed can be obtained by performing a steam treatment without drying, but it cannot be applied to a printed material, and a slene dye or the like is reduced by a reducing agent. There is a problem that the dye concentration gradually decreases due to decomposition, and tailing occurs.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems in the case of imparting a natural feeling to a worn and washed appearance to a cellulosic fiber structure. is there.

That is, in the present invention, it is possible to easily and uniformly impart a worn-out washing feeling of a natural feeling to the cellulosic fiber structure, and the color fades and the fading feeling does not progress with each washing. It also provides a processing method that enables various hues.

[0008]

The above-mentioned object is a method for dyeing or printing a cellulosic fiber structure with a slene dye, which comprises applying a treatment liquid comprising a slene dye, a wetting agent and a reducing agent, and then performing a heat treatment. It is achieved by a washing-finishing method of a cellulosic fiber structure, which is characterized by the following steps.

The present invention will be described in detail below.

Examples of the cellulosic fibers used in the present invention include cotton, hemp, rayon and acetate. Such cellulosic fibers may be used alone or mixed with other fibers by blending, knitting or the like, and in the case of being mixed, it is desirable to contain 50% by weight or more of the cellulosic fibers. Examples of the fibrous structure include yarns, woven fabrics, knitted fabrics, and non-woven fabrics.

The slene dyes that can be used in the present invention include
Examples include thioindigo-based, indanthrone-based, bilancerone-based and isodibenzanthrone-based. The amount of such a slene dye to be used may be an appropriate amount depending on the dyeing or printing density.

Examples of the wetting agent usable in the present invention include ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, butyl cellosolve and glycerin. The amount of the wetting agent used is 1 to 15% by weight based on the cellulosic fiber structure.
To be given.

The reducing agent used in the present invention is not particularly limited as long as it converts a slene dye into a fiber-affinity leuco compound, and examples thereof include sodium dithionite (sodium hydrosulfite). The reducing agent is used in an amount of 1 to 15% by weight based on the cellulosic fiber structure.

The treatment liquid contains the above-mentioned slene dye, wetting agent and reducing agent, but does not contain alkali. Examples of the method of applying the treatment liquid include a padding method, a spray method, a printing method, and the like.

After applying the treatment liquid, the fiber structure is usually dried at 80 ° C. or higher if necessary. Then heat treatment,
As a heat treatment method, a method of performing a drying treatment at 120 to 170 ° C., a method of steaming with saturated steam at 120 ° C. or less,
A method of steaming with heated steam at 190 ° C. or lower may be used. The treatment temperature, time, etc. may be appropriately selected according to the washing condition of the product.

After the heat treatment, cleaning is performed using a continuous winch, winch, open soaper, washer or the like. The temperature, time, etc. at the time of cleaning may be appropriately selected according to the washing condition of the product. After washing, the fiber structure is usually dried at 80 ° C. or higher.

[0017]

[Function] When a treatment liquid containing a slene dye, a wetting agent and a reducing agent is applied to the cellulosic fiber structure and heat treated,
The slene dye becomes a butyric acid by the reducing agent, and due to the action of the wetting agent, a large amount of butyric acid often enters the surface layer of the fiber, and the dye adheres to the cellulosic fiber structure to some extent. Next, when this is washed, the dye partly falls off, and it becomes a wash-out tone.

[0018]

EXAMPLES The present invention will be described in detail below based on examples.

Example 1 A cotton satin fabric woven using 20-count single yarn as warp and 16-count single yarn as weft and with warp density of 105 yarns / inch and weft yarn density of 55 yarns / inch is woven according to a conventional method. , Desizing, scouring, and bleaching were performed.

To this satin fabric, as a slene dye, Mikethren Violet RP (manufactured by Mitsui Toatsu Dye Co., Ltd.) 30 g /
l, polyethylene glycol 50 g / l as a wetting agent,
After padding a treatment solution consisting of 100 g / l of sodium hydrosulfite (Superlite SZ, manufactured by Mitsubishi Gas Co., Ltd.) as a reducing agent with a pickup rate of 70%, 80
Dry at 5 ° C for 5 minutes. After that, using an ager, 102 ℃
The product of Example 1 was obtained by steaming for 8 minutes, followed by hot water washing and water washing.

Comparative Example 1 A product of Comparative Example 1 was obtained by performing the same treatment as in Example 1 except that polyethylene glycol was not used.

The product obtained in Example 1 had a darker color than the product obtained in Comparative Example 1 and was excellent in the feeling of being washed.

[0023]

As described above, according to the method of the present invention, it is not difficult to control the dyeing density as in the conventional method, the process time is short, there is no odor problem, and the wash feeling is excellent and reproducible. It is possible to achieve certain processing continuously, and its industrial utility value is great. In addition, the resulting product can be used in all hues, has an unprecedented sense of washability, and is extremely useful as a casual application.

Claims (1)

[Claims] 1. A method for dyeing or printing a cellulosic fiber structure with a slene dye, which comprises applying a treatment liquid comprising a slene dye, a wetting agent and a reducing agent, followed by heat treatment, and then washing. Washing and finishing processing method for cellulosic fiber structure.