JPH0118191B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a flow dyeing method,
More specifically, the present invention relates to a dyeing method for dyeing cellulose-based textiles using reactive dyes at low temperatures, in a short time, and in a fast manner.

BACKGROUND ART Liquid surface transfer dyeing methods using fluids, such as suminagashi dyeing and glue nagashi dyeing, are conventionally known as industrial dyeing methods. In other words, flow dyeing involves floating and flowing a coloring liquid containing colorants such as ink, dyes, pigments, and optionally resins and oils on the surface of water or viscous liquid to form a pattern, which is then transferred and fixed onto fabric. It is a dyeing method. However, with conventional methods, it is difficult to form attractive patterns on the water surface;
The pattern tends to blur, the coloring agent tends to settle, making it difficult to match the pattern observed on the water surface with the pattern transferred onto the cloth, and the difficulty of accurately transferring the pattern on the water surface onto the cloth. It has many problems, such as low utilization rate, difficulty in fast dyeing at low temperatures and in a short time, and difficulty in obtaining desired patterns with good reproducibility.

The inventor of the present invention has arrived at the method of the present invention as a result of intensive research to solve the problems of the conventional method. That is, the present invention is characterized in that a pattern formed on the surface of a viscous liquid using a cold type reactive dye is transferred and fixed onto a cellulose-based textile product that has been pretreated with an alkali.

When using the method of the present invention, the pattern formed on the viscous liquid surface is stable, the pattern can be transferred faithfully and reproducibly, the transfer dyeing can be performed clearly and robustly at low temperature and in a short time, and the dye utilization rate is high. It also has many features such as an excellent adhesion rate. The reason for this excellent effect is that by using alkali and reactive dye in separate baths, changes in the viscosity of the glue are prevented, the viscosity is maintained constant, a stable pattern is formed, and the reproducibility is improved. By performing a certain transfer and improving the fixation rate by preventing dye hydrolysis, and by using cold-type reactive dyes to adsorb dye liquid and dye fixation at low temperatures and in a short time, patterns can be created. It is believed that the transfer is faithful and clear, resulting in elegant flowing dyeing. In addition, when transferring and fixing, by overlapping the base plate that forms the pattern and the textile product and placing them in a heated atmosphere for a short time, the fiber side is heated and the base plate side is difficult to heat, so the pattern adsorbed to the fibers is As it nears dryness, the remaining liquid is kept at a cool temperature, resulting in a pattern that does not become disordered or blurred.

The cellulosic fiber products to which the present invention is applied include not only fiber products made of natural cellulose fibers such as cotton and hemp, regenerated cellulose fibers such as viscose rayon, polynosic, and copper ammonium rayon, and mixed cellulose fibers thereof. Examples include fiber products mainly composed of cellulose fibers mixed with other fibers. Examples of textile products include woven fabrics, knitted fabrics, nonwoven fabrics, and rugs. The textile product is subjected to desizing, scouring, and bleaching, but may also be ground-dyed, printed, or partially resist-dyed as the case requires. In particular, natural cellulose fibers are preferably treated to improve swelling or water absorption by mercerization, partial etherification, carboxymethylation, lower alkylation, hydroxyalkylation, or the like. Furthermore, the reactivity and adhesion can be improved by pretreatment with a glycidyl ammonium compound.

Cellulose-based textiles are pretreated with alkali for flow dyeing. The alkalis used include inorganic alkalis such as alkali carbonate, alkali bicarbonate, alkali phosphate, and alkali silicate;
-In addition to organic alkalis such as diazabicyclo(2,2,2)octane, latent alkalis such as sodium acetoacetate can also be used. Particularly preferred are alkali carbonates. It is also preferable to use a penetrant, a dye solubilizer, etc. in combination with the alkaline treatment liquid. In addition, a hydrophilic softener, an alkaline discoloration inhibitor, etc. may be used in combination, depending on the case. The concentration of the alkali used varies depending on the type of alkali used, the type and amount of the dye, the application method, etc., but is usually about 0.1 to 5% owf for alkali carbonate, preferably 0.5 to 2% owf. After alkali treatment, it is usually dried and used for flow dyeing.

In addition, the cold type reactive dyes used in the present invention include dichlorotriazine,
Examples include dichloroquinoxaline dyes, vinyl sulfone dyes, etc., which usually react at temperatures below about 50°C, and dichlorotoluazine-based reactive dyes are particularly preferred.

To explain the flow dyeing of the present invention in more detail, a thin layer of viscous liquid is spread on a flat plate such as glass, plastic, ceramics, board, hardboard, water-resistant paper, synthetic paper, leather, etc. to a thickness of about 1 mm. Drop or flow the dye solution containing the cold type reactive dye on top of the base plate and tilt it back and forth and/or left and right to form any desired pattern, or stir with a spatula or wiper to form any desired pattern. After forming, the dyed side of the alkali-pretreated cellulose fiber product mentioned above is placed on the patterned side, being careful not to leave any gaps, the pattern is transferred and adsorbed, and then the entire product is usually dyed (with the base plate). The dye is fixed in a heated atmosphere.

As the sizing agent used for viscous liquids, the sizing agent used for ordinary printing pastes is widely used, but it has a viscous behavior that has few reactive groups with reactive dyes, is easily absorbed by cellulose fibers, and is easy to remove after dyeing. Preferred are stable sizing agents such as alginates such as sodium alginate, alginate propylene glycol ester, carboxymethyl cellulose,
Methylcellulose, hydroxypropyl methylcellulose, etc. are preferred, and sizing agents based on alginate are particularly preferred. The concentration of the sizing agent varies depending on the type of sizing agent used, the desired pattern, etc., but it is usually Particularly preferred are concentrations around about 3% by weight.
Of course, an even lower density can be used if a blurring effect is desired. In addition, a reactive dye solution is also normally used as a dye solution containing a reactive dye and a sizing agent similar to the above, but the sizing agent preferably consists of alginate, and its concentration is usually the same as that of the viscous liquid above. . In addition, penetrants, dye solubility agents, migration inhibitors, fixation promoters, etc. may be appropriately used in the dye liquor as required.

After the pattern and the cellulose fiber are superimposed, the cloth surface may be sprayed to give a shading effect, or an alkaline catalyst may be additionally sprayed to improve adhesion. The dye fixing treatment may be a moist heat treatment, but it is usually sufficient to heat the dye at room temperature to about 50° C. for several minutes using hot air treatment. Especially 30-50
It is preferable to place each base plate in a suitable box heated to ℃ using a hair dryer and heat it for a short time. Prolonged heating causes dye migration and pattern disturbance, causing the pattern to become unclear.

After the dye fixation treatment, textile products are washed with water or neutralized and washed with water, then dried, finished, and flow-dyed. If desired, fastness improvers, shrink-proofing agents, fabric softeners, and water repellents may be added. Further improved finished fabrics can be obtained by post-treatment with oil repellents, coating resins, etc.

The present invention will be explained below with reference to Examples, but it goes without saying that the present invention is not limited to the Examples.

EXAMPLE A cotton cloth that had been desized, scoured, bleached, and mercerized in a conventional manner was immersed in a 2% by weight aqueous solution of soda ash, squeezed at a squeezing rate of 70%, and swathed to dry.

On the other hand, a 3% by weight aqueous solution of sodium alginate was uniformly spread on a white plastic plate to a thickness of about 1 mm, and 3% each of dichlorotriazine-based cold-type reactive dye and sodium alginate were added on top of it.
The dye solution dissolved in weight percent was dropped and dabbed with a spatula to form a pattern.

Next, the dyed side of the alkali pretreated cotton cloth was placed on the pattern so that there were no gaps, and after the pattern was transferred and adsorbed, the fabric was placed in a box heated to 40°C with hot air and heated for 3 minutes. Ta.

Next, the cotton cloth was taken out, neutralized with a 0.5% by weight tartaric acid aqueous solution, washed with water, dried, and finished.

As a result, the unique pattern was clearly and firmly fixed in a short time. Note that the base plate used for forming the pattern is made of plastic, which has a low thermal conductivity, and has the characteristic that the pattern does not blur compared to a metal plate, which has a high thermal conductivity.

On the other hand, in Comparative Example A, in which the cotton fabric was flow-dyed in the same way by adding alkali to the dyeing solution without pre-treating it with alkali, the alkali had a negative effect on the viscosity of the glue.
Not only was it difficult to create a stable and beautiful pattern, but also the water present in the dye liquor and the dye caused a chemical reaction, resulting in a decrease in dyeability and the inability to obtain clear dyeing.

Also, unlike the above method, in Comparative Example B, in which alkali was applied by spraying from the front and back sides after transferring the flowing pattern, the presence of glue made it difficult for the alkali to penetrate into the fabric, resulting in incomplete dyeing and no staining. In addition to being uniform, there were also defects such as blurring of the pattern.

Furthermore, Comparative Example C, in which the flow pattern was transferred and dried, and then alkali was applied by spraying from the front and back, had the disadvantage that the pattern was not stable when drying and it was difficult to obtain clear flow dyeing.

Claims (1)

[Claims] 1. A flow dyeing method characterized by transferring and fixing a pattern formed on a viscous liquid surface using a cold type reactive dye to a cellulose-based textile product pretreated with an alkali. Law. 2. The flow dyeing method according to claim 1, wherein the viscous liquid is an aqueous solution containing a sizing agent mainly composed of alginate. 3. The pattern according to claim 1 or 2, wherein the pattern is formed by dropping or pouring a cold type reactive dye solution onto the surface of a viscous liquid thinly drawn on a flat plate. Flow dyeing method. 4. The flow dyeing method according to claim 3, wherein the transfer fixation is carried out by placing the textile on the pattern and heating the whole flat plate at 30 to 50°C for a short time.