JPS6035466B2 - Dry transfer printing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dry transfer printing method, and more specifically to natural cellulose fibers such as cotton and hemp, regenerated fibers such as viscose, or blends thereof, and cellulose-based fibers such as deer weave. This invention relates to a pretreatment method for dry transfer printing using a cationic dye (basic dye) or its derivative.

Dry transfer printing has now established a firm position in the textile printing field.

Disperse dyes are mainly used in this printing method, but cationic dyes are also widely used because their thermal transferability can be enhanced by coexistence with basic substances or oxidizing agents. 49-12
917 publications, etc.). However, the textile products to which these dyes can be applied have been limited to synthetic fibers such as polyester, nylon, and acrylic due to their dyeability and fastness. On the other hand, it is considered impossible to perform dry transfer printing on natural fibers because there is no dye that satisfies both sublimability and dyeability.

Therefore, various proposals have been made for dry transfer printing of natural fibers using disperse dyes, but these proposed methods generally require surface treatment of the transfer surface in advance using a resin that has an affinity for disperse dyes. Because it is applied to cellulose fibers, it not only greatly impairs the unique texture and hygroscopicity of cellulose fibers, but also has the disadvantage that it is not possible to obtain the vivid hue that can be obtained when applied to synthetic fibers such as polyester. As a result of various studies in view of the above-mentioned conventional technology, the present inventors have found that they have graft-polymerized or intra-fiber-polymerized vinyl monomers having a glycidyl group on cellulose fibers, and then treated them with an aqueous solution of ammonium salt before performing dry transfer printing. Pre-process,
After drying, we found that dry transfer printing using a transfer sheet containing a cationic dye or its derivative as a colorant is extremely effective for transfer printing of cellulose fibers.

Therefore, the present invention is directed to 'a-', which involves graphographic polymerization or intrafiber polymerization of a pinyl monomer having a glycidyl group to cellulose fibers of a textile product made of cellulose fibers or a blended or mixed textile product mainly composed of cellulose fibers. a step of treating the polymerized textile with an aqueous solution of ammonium salt, and then drying it, 'c}
A step of performing transfer printing on the treated textile product by heating and pressing using a transfer sheet containing a cationic dye or its conductor as a coloring agent,'d} Washing the transfer-printed textile product with water and then drying it. The gist is the dry transfer printing method, which is characterized by including a process.

According to the method of the present invention, it is possible to obtain a printed material with vivid color development unique to cationic dyes while retaining the hygroscopicity and texture inherent to cellulose fibers. The present invention will be explained more clearly below.

The objects to be printed in the present invention include textile products made of natural cellulose fibers such as cotton and hemp and regenerated cellulose fibers such as viscose, or synthetic fibers such as acrylic, nylon, and polyester, or synthetic fibers such as wool and silk in addition to the cellulose fibers. Textile products made by blending natural fibers or mud weaving are applicable.

Hereinafter, these products will be collectively referred to as "cellulose fiber products."
Specific examples of glycidyl group-containing vinyl monomers that are graft-polymerized or intrafiber-polymerized to the cellulose fibers (hereinafter simply referred to as grafting, including intra-fiber polymerization) include glycidyl acrylate and glycidyl methacrylate. and allyl glycidyl ether.

The monomers used in the grafting process can be used alone or in combination of multiple types from the above, and further, other vinyl monomers such as methyl acrylate, methyl methacrylate, styrene, acrylamide, etc. may be mixed. . In addition, any known method may be used for the grafting process, such as a method of grafting by flooding in the monomer solution or dispersion chamber, a method of irradiating a textile product impregnated with the monomer with an electron beam, etc. Applicable.

The present invention is characterized in that after the above-mentioned grafting process, and before transfer, the transferred object is pretreated with an aqueous solution of an ammonium salt of an acid as a coloring aid.Specific examples of this coloring aid include: , ammonium salts of sulfuric acid, phosphoric acid, tartaric acid, sulfamic acid, etc.

These may be used alone or in a mixture of two or more, but preferably 0.2 to 20% by weight based on the fiber to be transferred.
．． It is desirable that the treatment be performed so that the amount of the drug attached is 5 to 10% by weight. The surface of the transfer object can be treated with these aqueous solutions, such as by immersing and squeezing the grafted object in the aqueous solution, or by spraying onto the object that has been grafted with the aqueous solution, etc. Any method may be used as long as the drug can be attached to the surface. As described above, transfer is performed onto the treated textile, but when the method of the present invention is used, the strength of the object to be transferred may be reduced during transfer due to the coloring aid used, or the object to be transferred may be damaged. It may become rhombic.

In this case, their generation can be prevented by adding urea to the coloring agent bath. For this purpose, urea is added to the aqueous solution, but excess urea may reduce the effect depending on the type of coloring aid used, so the amount of urea added depends on the coloring agent used. It is preferable to add an auxiliary agent as appropriate. Further, in the method of the present invention, after the cellulose fibers have been grafted and before transfer, a treatment with a sulfate aqueous solution can be added before or after the treatment with the color development aid aqueous solution.

This treatment opens the glycidyl group of the already grafted polymer and introduces a sulfuric acid group therein, and in addition to the treatment with the aqueous solution of ammonium salt, it can further improve the stainability of the dye. As a specific method, for example, the grafted product may be placed in a 0.5 to 40% aqueous solution of a sulfate such as sodium hydrogen sulfate or potassium hydrogen sulfate, and heated to about 60 to 100 oo.
The cellulosic fibers subjected to the above pretreatment are subjected to dry transfer printing using a transfer sheet containing a thionic dye or a derivative thereof as a coloring agent by heating and pressing in a conventional manner.

Here, the transfer sheet is one having a colored layer in which a basic substance or an oxidizing agent coexists with a cationic dye, as described in JP-A-49-12916 and JP-A-49-12917, etc. Sekisho 50-18784, same 5
0-1488, which contains carbinol bases of cationic dyes or derivatives thereof in the colored layer, or carbinol bases of cationic dyes, as described in Tokuiso Sho 52-142424. Those having a colored layer in which a basic substance coexists with a nor base or its derivative are preferably used. In the method of the present invention, after the transfer printing, the textile product is washed with water to remove various chemicals used in the pretreatment, and then dried.

Furthermore, the fastness of the dyeing can be further improved by subjecting the cellulosic fibers dyed by the method of the present invention to transfer, washing with water as described above, drying, and then resin processing.

The agent for resin processing can be appropriately used in consideration of texture, etc., but methylol compounds, such as urea-based resins, melamine-based resins, cellulose-reactive resins, etc., are preferred. Hereinafter, the present invention will be explained in more detail with reference to Examples.

In addition, in the following text, "parts" indicate "parts by weight." Example
1 One piece of white cotton fabric was placed in the above bath, and the grafting process was performed at 3,500 yen for 3 minutes in a closed system.

Thereafter, this grafted cloth was washed with water, immersed in a drying bath, squeezed at a squeezing rate of 90%, and dried.

The treated cloth thus produced was used as a transfer cloth. on the other hand,
A predetermined pattern was printed on kraft paper using an ink having the following composition using a gravure method to obtain a transfer paper.

The printed surface of this transfer paper and the transfer cloth were overlapped and transfer printing was carried out for 30 seconds at 19,000 yen under atmospheric pressure, after which it was thoroughly washed with water and dried. As a result, a dark and clear transfer cloth was obtained. Ta. Example 2 In Example 1, it was added that the grafted cloth was placed in the melt after the grafting process and treated at 90 oo for IS minutes.

Thereafter, the film was washed with water and dried, and further subjected to auxiliary agent treatment and transfer using the same machine as in Example 1, washed with water, and dried. As a result, the dyed fabric showed even better color development. Example 3 The dyed cloth prepared in Example 1 was immersed in a molten metal tube, and then squeezed at a squeezing rate of 90% to 70mm
After pre-drying at 15000 for 5 minutes, resin processing was performed by curing at 15000 for 5 minutes.

Claims (1)

[Scope of Claims] 1. A dry transfer printing method comprising the following steps: (a) adding a glycidyl group to the cellulose fibers of a textile product made of cellulose fibers or a blended or mixed textile product mainly composed of cellulose fibers; a step of graft polymerization or intrafiber polymerization of the vinyl monomer, (b)
a step of treating the polymerized textile with an aqueous solution of ammonium salt and then drying; (c) transferring the treated textile by heating and pressing using a transfer sheet containing a cationic dye or a derivative thereof as a coloring agent; a step of performing textile printing; (d) a step of washing the transfer-printed textile with water and then drying it; 2. The dry transfer printing method according to claim 1, wherein the aqueous solution in step (b) contains urea. 3. Dry transfer according to claim 1 or 2, further comprising the step of treating the polymerized textile with an aqueous solution of sulfate after step (a) and before step (c). Printing method. 4. The dry transfer printing method according to claim 1, 2, or 3, further comprising the step of subjecting the transfer-printed textile to a resin treatment after step (d).