JPH041117B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for non-uniform dyeing of cellulosic fibers. More specifically, the present invention pads a white cloth or dyed cloth made of cellulose fibers with a dye solution containing a dye that is water-insoluble and dissolves and dyes by being reduced to a lyuco compound, an alkaline agent, and a sulfinic reducing agent, The present invention relates to a non-uniform dyeing method for cellulose fibers, which is characterized by steam treatment without drying.

According to the method of the present invention, it is possible to obtain a dyed product with flickering dark and light colors on white cloth, and to obtain an iridescent dyed product on a cloth dyed with a dye that is relatively resistant to reduction. .

Conventionally, methods to obtain such effects include spinning using pre-dyed yarns of two or more colors, or dyeing each fiber in woven or knitted fabrics of blended, interwoven, or mixed yarns made of two or more types of fibers. Methods include applying a combination of dyes to be applied, or creating dye spec particles in advance and applying them.
However, in these methods, weaving and knitting from dyed yarn increases costs in small-lot production, the process becomes longer when using composite materials, and the method of creating and applying dye spec particles is dependent on the uniformity of the particles. Shortcomings such as lack of reproducibility have been pointed out.

As a result of intensive research into a method to easily obtain non-uniform dyeing effects on woven and knitted fabrics made of a single material with good reproducibility, the present inventors found that cellulose fibers are water-insoluble and reduced, becoming lyuco compounds and dissolving. We have discovered that this can be achieved by padding the dye to be dyed and steaming it while retaining moisture.

In the present invention, cellulose fibers include cotton, cotton wool, human silk, etc., and these may be used alone or in combination of two or more types.

Examples of dyes that are water-insoluble and can be reduced and dissolved as lyuco compounds for dyeing include patch dyes, sulfur dyes, and sulfur patch dyes.

On the other hand, in order to obtain a non-uniform iridescent effect on a dyed product, it is preferable that the dye that has already been dyed does not lose its concentration under heat and alkaline conditions and is non-reducible or difficult to reduce, such as reactive dyes. Among these, those having a trichloropyrimidine group, monochlorotriazine group, or monofluorotriazine group as a reactive group, and direct dyes, naphthol dyes, and ingrain dyes are selected.

Background dyeing is usually carried out by a known method and is not particularly restricted.

The present invention will be explained step by step. Water-insoluble dyes and alkaline agents, such as caustic soda (solid), that dissolve and dye cellulose-based fiber white or dyed fabrics by reducing them into RYUCO compounds.
150 parts by weight (parts by weight is based on 1000 parts of the total amount of dye solution), preferably 20 to 100 parts by weight, 10 to 150 parts by weight of a sulfinic reducing agent, such as sodium formaldehyde sulfoxylate, preferably 20 to 100 parts by weight
parts by weight, and optionally 0 to 30 parts by weight of a dispersant, and 0 to 30 parts by weight of a protective colloid agent for the dye Ryuco compound.
The fabric is impregnated with a dye solution containing 0 to 100 parts by weight of an inorganic salt, and steam-treated at a moisture content of 20% or more (the ratio of dye solution applied to the weight of the dry fabric), preferably 50 to 90%. Then, it is finished by washing with water, oxidation treatment, soaping, and washing with water.

In this way, non-uniform dyeing of a single material, which was thought to be impossible in the past, can be achieved continuously with good reproducibility, and the industrial value of the present invention can be said to be extremely high.

Next, the present invention will be explained in more detail with reference to Examples. Parts in the text indicate parts by weight.

Example 1 After dispersing 50 parts of Redol FBB (vat dye: product of Sumitomo Chemical Co., Ltd.) in 300 parts of hot water at 30 to 40°C, 100 parts of caustic soda (40°B'e) and Redol C (sodium Formaldehyde sulfoxylate: Sumitomo Chemical Co., Ltd. product) 50 parts and the remaining amount of water to prepare a total of 1000 parts by volume of a dye dispersion. next,
A broad white cotton cloth is padded with the above dye dispersion at a squeezing rate of 90%, and immediately subjected to steam treatment at 100°C for 60 seconds under saturated steam.

It is then treated with an oxidizing solution containing 3 parts by volume of hydrogen peroxide (35% solution) at 60°C for 60 seconds, then treated with a soaping solution containing 2 parts of anionic detergent at 95°C for 60 seconds, and finished by washing with water.

In this way, a dyed cloth with flickering red color shading was obtained.

On the other hand, when a broad white cotton cloth was padded with a dye dispersion, once dried, and then treated with steam, the entire cloth was evenly dyed, and no flickering effect of light and shade could be obtained.

Example 2 Sumifix Brilliant Red H-
Dissolve 30 parts of 3B (monochlorotriazine type reactive dye: product of Sumitomo Chemical Co., Ltd.) in 300 parts of boiling water at 80 to 90°C, then add 50 parts of urea, 20 parts of sodium bicarbonate, 1 part of sodium alginate, and the remaining amount to a total of 1,000 parts with water. Prepare parts by volume of dye solution.

Next, the cotton broad cloth was squeezed into the above dye solution at a squeezing rate of 60.
%, and after intermediate drying, steam treatment is performed at 100℃ for 10 minutes under saturated steam.

Then, after washing with water, treat with a soaping liquid containing 1 part of nonionic detergent at 90°C for 3 minutes, and finish by washing with water.

Separately, 50 parts of Nihonsuren Brilliant Green B (butt dye: product of Sumitomo Chemical Co., Ltd.)
After dispersing in 300 parts of warm water at ℃, 100 parts of caustic potash (40°B'e) and 50 parts of Redol ZW (zinc formaldehyde sulfoxylate: a product of Sumitomo Chemical) were added.
1 part, KYA-703B (dispersion protective colloid agent: Ichisha Yushi Co., Ltd. product), 50 parts of table salt, and the remaining amount of water for a total of 1000 parts.
Prepare parts by volume of the dye dispersion.

Next, the dyed cloth is squeezed into the dye dispersion at a rate of 70%.
Immediately heat under saturated steam at 100℃ for 2 hours.
Steam for 1 minute. It is then treated with an oxidizing solution containing 3 parts by volume of hydrogen peroxide (35% solution) at 60°C for 60 seconds, then treated with a soaping solution containing 2 parts of anionic detergent at 95°C for 60 seconds, and finished by washing with water.

In this way, a dyed cloth having a unique iridescent pattern was obtained.

On the other hand, dyed cotton cloth is padded in a dye dispersion, dried and then steam-treated.
The whole was uniform and did not have an iridescent appearance.

Claims (1)

[Claims] 1 A dye solution containing a water-insoluble dye, an alkaline agent, and a sulfinic reducing agent that is water-insoluble and dissolves and dyes as a lyuco compound is padded onto white or dyed cellulose fiber cloth, and then steam-treated without drying. A non-uniform dyeing method for cellulose fibers.