JPS601435B2 - Printing method for synthetic fiber fabric - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for printing synthetic fiber tails using disperse dyes, which can be printed with high productivity by offset printing or flexo printing, and eliminates the need for a vertical washing process after dyeing. The present invention provides a novel textile printing method that provides a high degree of clarity.

The conventional printing method for synthetic fiber fabrics using conventional disperse dyes is to print using a printing paste prepared using a water-repellent sizing agent using screen printing or roller printing.After drying, heat treatment such as steaming or hot air treatment is performed. This was a method of penetrating the dye into the inside of the fiber and fixing it, that is, dyeing it.This method has the drawbacks that screen printing has low productivity and roller printing requires expensive printing rollers. It does not dye the fibers, and a considerable amount remains in the glue film or in the dyeing layer in a state where it comes off by washing, etc. Therefore, if sufficient washing treatment is not performed after the dyeing process, the undyed dyestuffs will be removed. As a result, washing and abrasion fastness are significantly reduced, and undyed dyes form large clumps of molecules and do not show the original dyed color, which may hinder the color development of dyed dyes and reduce clarity. It is also known that a water-soluble sizing agent is used as emaljoso glue, and in this case, the solid content can be reduced, so there is no undyed dye remaining in the sizing agent. Although this may be said to be reduced, a considerable amount of undyed dye remains and a cleaning process after the dyeing process is inevitable. In contrast, in the present invention, the size agent is not used as a mere intermediate agent, but rather breaks down the lumps of undyed dye and makes it firmly adhere to the fibers. Making them take on the role of contributing to color development,
It was developed based on the idea of using printing technology that allows printing plates to be obtained at low cost and with high efficiency. Although it is similar to printing, the present invention is dyed using disperse dyes, and therefore, it has a deep and highly vivid coloring that cannot be obtained with pigment printing, and has a fastness that is better than conventional disperse dye printing or pigment printing. It has excellent features such as:

In the present invention, a printing process using a disperse dye using a substance that is compatible with the disperse dye and capable of forming a water-insoluble film as a sizing agent is printed on a fabric made of synthetic fibers, usually by offset printing or flexo printing, and then heated. The dye is dyed on the fiber by the treatment, and the undyed dye is fixed on the fiber together with the material film.
A method for printing a synthetic fiber fabric is characterized in that a colored fabric in which almost 100% of the printed disperse dye contributes to color development is obtained. In the present invention, the use of a substance that is compatible with disperse dyes and capable of forming a hydrophobic film is used as a sizing agent because the dye molecules that remain in the undyed area without dyeing the fibers do not combine and form a sizing agent. When dissolved in a dye, it develops the same color as the dye, and the glue forms a water-insoluble film on the fiber surface and fixes it, thus firmly fixing the undyed dye, including the dye, to the fiber. Therefore, both the dyed dye and the undyed dye dissolved in the sizing agent contribute 100% to color development, resulting in better dyeing fastness than conventional disperse dye printing.

Examples of such sizing agents used in the present invention 3 include fatty acid-modified alkyd resins, mixtures of this with thermosetting resins such as alkylated methylolmelamine, phenolic resins, natural resins such as rosin, pine resin, etc., and fatty acids. , drying oil,
Mixtures with non-drying oils, etc., acrylic resins or acrylic resin emulsions soluble in solvents or water, and especially cross-linked acrylic resins having groups such as carboxyl, amide, methylolamide, oxyglycidyl, etc. in the molecule, methoxymethylated Polymers having ester or amide groups such as nylon can be used to form a three-dimensional polymer film because of their particularly good washing and abrasion fastness. It is said that a material that forms a linear polymer film as described above is desirable. A printing paste is prepared by adding a disperse dye to a solution, emulsion, or suspension solution of such a size agent, and is usually printed on cloth made of synthetic fibers, but the disperse dye used here also has no compatibility with the size agent. Although this is related to the heat treatment conditions that follow, it is preferable to select a material that has as little undyed amount as possible and that is difficult to sublimate during heat treatment. Even though the present invention firmly fixes undyed dyes, including dyed dyes, to fibers using a glue film, the film that retains undyed dyes is on the outside of the fibers and is not subject to the action of external forces. In addition, if the dye sublimes during the heat treatment that dyes the fiber, there will be problems such as contaminating the hot water during printing and making the edges of the pattern unclear. be. In general, dyes that are classified as so-called high-energy dyes that have a large molecular weight and are difficult to sublimate are often undyed, while dyes that are classified as so-called low-energy dyes that have a small molecular weight and are easily sublimed are undyed. The relationship is that the amount of dyeing decreases. Therefore, a dye having an undyed amount and sublimability that does not cause problems in relation to the subsequent heat treatment conditions can be sufficiently selected from the above range. The heat treatment after printing with the printing paste in the present invention has the effect of dyeing the fibers with the dye, removing excess additives in the printing lake, and forming a paste film. Normal pressure or high pressure steaming using saturated steam, normal pressure steaming using superheated steam, hot air treatment, and electromagnetic wave treatment such as infrared rays are used.

In order to reduce the amount of undyed dye, it is desirable to use methods that can be easily processed at high temperatures, such as superheated steam treatment, hot air treatment, and electromagnetic wave treatment. However, superheated steam treatment and hot air treatment are subject to particular temperature restrictions, since sublimation dyes may contaminate white areas or make mold edges unclear. On the other hand, electromagnetic wave treatment such as infrared rays is less prone to such problems and has the advantage that treatment can be performed under sufficient temperature conditions to reduce undyed dye. Therefore, during the initial heating process or during a relatively low temperature period to evaporate excess additives, superheated steam treatment or hot air treatment is used.
After that, infrared processing is extremely effective.
Further, when using a low to medium energy dye, an electromagnetic wave heating method is extremely effective as a dyeing treatment method in the present invention. In the case of infrared treatment, the wavelength best matches the absorption wavelength of the resin and fiber used, but generally 5r
It is desirable that many of the above wavelengths be included. Examples will be described below, but the present invention is not limited thereto. The dye concentration in each Example was adjusted so that the dye density after color development in each Example and Comparative Example was approximately the same. Example 1 20 parts of Miketone Polyester Red Go F bulk powder (manufactured by Mitsui Chemicals, low to medium energy dye) Fatty acid modified alkyd resin 15 parts Rosin modified phenol resin 15 parts Refined linseed oil Koto Petroleum based solvent
An offset ink, ie, a printing paste, made of Isobe was prepared, and this was used to perform offset printing on a cloth made of polyester fibers, followed by heat dyeing treatment.

Table 1 shows the heating and dyeing treatment conditions and results. Comparative Example For comparison, printing was performed on the same fabric as in Example 1 using a water-based paste and an emulsion paste, respectively, and the results are also shown in Table 1.

The composition of each printing paste is as follows, and since these printing lakes are not used for offset printing, the screen printing method was used for printing.

Printing paste composition using water-based glue 3 parts Miketone Polyester Red 5 (commercial product for water-based dyeing containing dispersant) 10% carboxy methyl cellulose aqueous solution 67 parts water
More than 3 samples were prepared in a conventional manner.

Emulsion glue composition: Miketone/Polyester/Shidoto F 3 parts (commercial product for water-based dyeing) Water
Meto methyl cellulose 5% aqueous solution 16 parts Emulgen 106 1 part (nonionic activator manufactured by Kao Soap) Mineral Turben
7. It was prepared by gradually adding mineral turbene to an aqueous methyl cellulose solution containing an activator to emulsify it while stirring at high speed, and then adding a dye dispersed in water to this.

Example 2 Miketone Polyester Cyd Abrasive F 2 Hole Acrylic Size 102 15 parts (water-soluble acrylic resin, manufactured by Teikoku Kagaku ■) Water
35 parts isopropyl alcohol
The composition consisting of the three anchor parts was kneaded with a paint conditioner to prepare a flexographic printing ink, ie, a printing paste, and this was used to flexographically print a cloth made of polyester fibers, followed by heat dyeing treatment.

The heat dyeing conditions and results are shown in Table 1 together with Example 1.
Table 1 (notes) 1): A, thermosol method (treated with hot air at 210°C for 1 minute under constant tension) B, far infrared method (using a far infrared heater made by Jyard Co., Ltd. 1, distance from the heater) is 15 skin,
A voltage of 176V was applied and treated for 12 seconds) ○, combined method of superheated steam treatment and far infrared rays treatment (after treated in superheated steam at 150°C for 5 minutes, far infrared rays treatment of B was performed) 2
): The color of the sample washed after heat dyeing treatment was used as the standard, and those with almost no difference from this were rated as ○, those that were markedly inferior were rated as ×, and those in between were rated as △.

3): According to JIS, L0849.

4): According to JIS, L0844, A-2 method.

5): Those with no white area contamination and sharp edges were rated as ○, those with markedly poor quality were rated as ×, and those in between were rated as △.

Claims (1)

[Claims] 1 Printing paste of disperse dyes using a substance that is compatible with disperse dyes and capable of forming a water-insoluble film as a sizing agent is printed on a fabric made of synthetic fibers, usually by offset printing or flexo printing, and heat-treated. , the dye adheres to the fibers,
A method for printing a synthetic fiber fabric, characterized in that a colored fabric is obtained in which the undyed dye is fixed to the fiber together with the substance film, and almost 100% of the printed disperse dye contributes to color development.