JPH041118B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for non-uniform printing of cellulosic fibers. More specifically, the present invention prints a printing paste containing a dye, an alkaline agent, and a sulfinic reducing agent, which is water-insoluble and dissolves and dyes as a lyukonated substance by being reduced, on white cloth or dyed cloth made of cellulose fibers. This invention relates to a method for uneven printing of cellulose fibers, which is characterized by printing and steam treatment without drying.

According to the method of the present invention, it is possible to obtain a print with flickering shading on white cloth, and also,
On fabrics dyed with dyes that are relatively resistant to reduction, it is possible to obtain prints that have an iridescent pattern on the surface and a different color on the back surface.

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 spec particles of dyes in advance and applying them.
However, in these methods, spinning and knitting from dyed yarns increases costs in small-lot production; when using composite materials, dye selection, toning and fixing conditions are complicated; and dye spec particles It has been pointed out that the method of producing and applying particles has drawbacks such as a lack of particle uniformity and reproducibility.

As a result of intensive research into a method for easily obtaining a non-uniform printing effect with good reproducibility on woven and knitted fabrics made of a single material, the present inventors discovered that cellulose fibers are water-insoluble and reduced, become dissolved as lyuco compounds, and are dyed. We have discovered that this can be achieved by printing a dye and then steam-treating 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.

Examples of dyes that are water-insoluble and can be reduced to form lyuco compounds to dissolve and dye include vat dyes and sulfur vat dyes.

On the other hand, in order to obtain a uneven dyed effect with different color tones on dyed cloth, it is preferable that the dye that has already been dyed does not decrease in concentration under heat and alkaline conditions and is non-reducible or difficult to reduce. For example, it is selected from reactive dyes having a trichloropyrimidine group, monochlorotriazine group, or monofluorotriazine group as a reactive group, as well as direct dyes, naphthol dyes, and ingrain dyes. Background dyeing is usually carried out by a known method and is not particularly restricted.

As a printing paste, it is preferable that it is alkali resistant, has a low paste solid content under the conditions of use, contains a large amount of free water, and has a large decrease in printing paste viscosity at high temperatures. Examples include starch-based thickeners and cellulose-derived thickeners.

Specifically, soluble starches that swell and gelatinize with alkali are used alone, starch-based thickeners such as raw or corn starch, and cellulose-derived thickeners such as carboxymethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, and cellulose sodium glycolate. It is used by mixing with some seaweed paste or natural gum paste.

Next, the present invention will be explained step by step.

A dye that is insoluble in water and dissolves and dyes as a lyuco compound upon reduction, and an alkaline agent, such as caustic soda (solid substance), 10 to 150 parts by weight (parts by weight is based on the total amount of 1000 parts), preferably 20 to 150 parts by weight 100 parts by weight, 10-150 parts by weight of a sulfinic reducing agent, such as sodium formaldehyde sulfoxylate,
Preferably 20 to 100 parts by weight, and if necessary,
A printing and dyeing paste is prepared comprising a sequestering agent such as a sodium salt of ethylenediaminetetraacetic acid, a wetting agent such as a glycol compound, an overreduction inhibitor such as triethanolamine, and the above-mentioned thickening agent. After printing this printing and dyeing paste on white cloth or dyed cloth made of cellulose fibers by coating the entire surface with a block roll or partially applying it with a gravure roll, immediately place it in saturated steam at 100℃ for 30 seconds to 10 minutes without drying. for a minute, then rinse with water,
Finish by oxidizing, soaping, and washing with water.

In this way, the industrial value of the present invention is extremely high, as non-uniform printing of a single material, which was conventionally thought to be impossible, can be obtained continuously and with good reproducibility.

Next, the present invention will be explained in more detail with reference to Examples.

Parts in the text indicate parts by weight.

Example 1 Sumifix Brilliant Blue H-
Dissolve 50 parts of 3R (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 1000 parts with water. Prepare parts by volume of dye solution.

Next, squeeze the cotton twill white cloth into the above dye solution at a rate of 70%.
After 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, add 70 parts of Nihonsuren Red FBB (butt dye: product of Sumitomo Chemical Co., Ltd.) to 500 ml of warm water at 30 to 40°C.
Beta gum J (soluble starch:
After adding and dissolving 35 parts of Meisei Kagaku Co., Ltd. product), 70 parts of caustic soda (40°B'e) was added under stirring to make a homogeneous paste, and then hydrosulfite conc (sodium Add 70 parts of hydrosulfite (product of Sumitomo Chemical) and measure the remaining amount with water.
Prepare 1000 parts of printing paste.

Next, overprint the printing paste on the dyed cloth using the blotch method, and immediately under saturated steam.
Apply steam treatment at 100℃ for 30 seconds. Then, the mixture was heated at 60°C in an oxidation bath containing 3 parts by volume of hydrogen peroxide (35% solution).
After processing for 60 seconds, process at 95℃ for 60 seconds with a soaping solution containing 2 parts of anionic detergent, and finish by washing with water.

In this way, a dyed cloth with a unique iridescent pattern of blue and red on the front surface and a blue color on the back surface was obtained.

On the other hand, when the printing paste was printed, once dried, and then treated with steam, the color tone was uniformly mixed and did not have an iridescent tone.

Example 2 A dyed cloth similar to that in Example 1 is prepared.

Separately, add 60 parts of Nihonsuren Orange RRTS (butt dye: product of Sumitomo Chemical Co., Ltd.) to hot water at 30 to 40℃.
After dispersing in 240 parts, Maypro Gum NP, 12
% paste (locust bean gum: Mayhall product) and 10% paste of Sorbitose C-5 (etherified starch: Skorten product)
After kneading with 300 parts, add 100 parts of potassium carbonate while stirring.
and 100 parts of Redol C (sodium formaldehyde sulfoxylate: a product of Sumitomo Chemical),
Prepare a total of 1000 parts of printing paste.

Next, the above-mentioned printed fabric is printed on the above-mentioned dyed fabric, and immediately subjected to a steam treatment at 100°C for 5 minutes under saturated steam. It is then treated with an oxidizing bath 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 for 60 seconds at 95°C, and finished by washing with water.

In this way, a dyed cloth was obtained in which the front side had an iridescent pattern of blue and red and the back side had a blue color.

On the other hand, when the printing paste was printed, once dried, and then treated with steam, the color tone was uniformly mixed and did not have an iridescent tone.

Example 3 After dispersing 70 parts of Japanese Thren Red FBB (butt dye: a product of Sumitomo Chemical Co., Ltd.) in 750 parts of hot water at a temperature of 30-40°C, 30 parts of Flashgen (soluble starch: a product of Nippon Star Chemical Co., Ltd.) was added and dissolved. After that, 50 parts of caustic soda (40°B'e) was added under stirring to make a uniform paste, and then 100 parts of Redol C (sodium formaldehyde sulfoxylate, a product of Sumitomo Chemical Co., Ltd.) was added under stirring. In addition, prepare a total of 1000 parts of printing paste.

This printing paste is printed on a white cotton twill cloth and immediately subjected to a steam treatment at 100°C for 5 minutes under saturated steam. It is then treated with an oxidizing bath 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 for 60 seconds at 95°C, and finished by washing with water.

In this way, a printed fabric having red-colored shading and flickering was obtained.

On the other hand, those printed with printing paste, once dried, and then treated with steam had a uniform color tone and no flickering effect of light and shade was obtained.

Claims (1)

[Claims] 1. A printing paste 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 printed on a white cloth or dyed cloth made of cellulose fibers, and then steam-treated without drying. A non-uniform printing method for cellulose fibers, which is characterized by: