JPS6361438B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for improving the dyeing hardness of dyed polyester fibers using low-temperature plasma. More specifically, it relates to a method for improving the color fastness of dyed polyester textiles by subjecting the dyed polyester textiles to low-temperature plasma treatment with oxidizing gas or reducing gas without performing reduction cleaning. It is. The polyester fiber products referred to in the present invention are raw cotton, yarn (spun yarn, filament yarn, processed yarn, etc.) made of polyethylene terephthalate fiber, or fiber made by copolymerizing polyethylene terephthalate with a third component such as isophthalic acid sulfonate or paraoxybenzoic acid. ) refers to woven fabrics, knitted fabrics, non-woven fabrics, and semi-finished products such as sweaters and socks, and also refers to the above polyester fibers and copolymer fibers and other fibers such as cotton,
This includes fibers made of fibers mixed with wool, nylon, etc. Generally, when polyester textiles are dyed by dip dyeing, the dyeing fastness is poor, especially in the case of deep color dyeing, as a part of the dye adheres to the surface of the polyester fiber, and the dyeing fastness is poor, especially in the case of dark color dyeing. Sublimation fastness and other properties are usually extremely low. For this reason, a reduction washing process is generally adopted as a process after dyeing in order to improve dye fastness. The reduction cleaning process uses reducing agents such as hydrosulfite and alkaline substances such as caustic soda and soda ash.
A common method is to use a combination of a nonionic activator and a treatment at 70°C to 90°C for 10 to 40 minutes, followed by washing with water. This reduction washing process improves the color fastness of dyed polyester fibers, but it also increases costs due to the use of chemicals, water, and heat, and requires wastewater treatment to prevent pollution. Gender also arises. The present invention was made in view of the current situation, and aims to obtain the same color fastness improvement effect as conventional reduction cleaning without using water or chemicals as in conventional methods. be. In order to achieve this object, the present invention has the following configuration. That is, the present invention relates to dyeing of polyester textiles, which is characterized in that after dyeing the polyester textiles, the textiles are dried without reduction washing, and then the textiles are subjected to low-temperature plasma treatment with an oxidizing gas or a reducing gas. This is a method of improving fastness. According to the present invention, unlike conventional reduction cleaning, chemicals, water, heat, etc. are not used, and therefore, there is no need for wastewater treatment as a pollution control measure. It is possible to improve the color fastness of The method of the present invention will be explained in detail below. In the method of the present invention, a polyester fiber product is first dyed by a conventional dyeing method and then dried without reduction washing. Dyeing is carried out using disperse dyes or cationic dyes, which are dyes for polyester, under normal conditions, for example, at 120° C. to 130° C. for about 10 minutes to 120 minutes.
In the conventional method, reduction cleaning is performed after this, but in the method of the present invention, this is not performed, but water washing and drying are performed. After drying, the present invention improves color fastness by subjecting the textile to low-temperature plasma treatment with an oxidizing gas or reducing gas instead of the conventional reduction washing process. The low-temperature plasma treatment in the present invention means that the dyed polyester fiber material to be treated is placed in an atmosphere obtained by glow discharge in a gaseous reduced pressure system, that is, maintained at 0.1 to 10 Torr. The gas is an oxidizing gas such as 100% oxygen or a mixture of oxygen and other gases such as nitrogen, argon, helium, carbon dioxide, or water vapor, or 100% hydrogen or hydrogen and other gases such as argon, Use a reducing gas such as a mixture of helium, carbon dioxide, water vapor, etc. To generate low-temperature plasma, the above gas should be mixed at 0.1~
This is irradiated with high frequency under a reduced pressure of 10 Torr. In this way, low-temperature plasma is generated and plasma processing becomes possible. The reasons for setting the processing pressure to 0.1 to 10 Torr are that below 0.1 Torr, the gas concentration is too low and the processing time is too long, and the vacuum maintenance costs are high, which is economically disadvantageous. This is due to the fact that the generation tends to become unstable and the temperature of the atmosphere becomes too high. High-frequency power sources for glow discharge can be used over a fairly wide range of wavelengths, from long wavelengths to short wavelengths, but in terms of operational stability and efficiency, the range of 1KHz to 300MHz is the easiest to use. The processing time varies depending on the type of polyester textile, the type of dye, and the amount of dye used, but it is usually 5 to 50 minutes.
The time is preferably 300 seconds, more preferably 20 to 120 seconds. When high-frequency energy is applied to the above-mentioned oxidizing gas or reducing gas in a reduced pressure system, the oxidizing gas or reducing gas becomes activated and becomes highly reactive. When the dye is placed on the surface of the polyester textile, it is oxidized or reduced, which improves the color fastness. The present invention has the above configuration, and according to the present invention, chemicals, water, heat, etc., as in conventional reduction cleaning are not used, and therefore, wastewater treatment for pollution prevention is not required. Therefore, the color fastness of polyester fiber products can be improved very rationally and at low cost. Therefore, the present invention has extremely great industrial utility value in the dyeing field. Next, the method of the present invention will be described in Examples, but the present invention is not limited thereto. Regarding the evaluation of color fastness in the examples, washing fastness was determined according to JISL-0844-2 method (however,
The detergent is a household synthetic detergent), and the sublimation fastness is
JISL-0854 dry method, friction fastness is JISL-0849
Evaluation was made using the wet mold method. Example 1 A double-sided circular knitted fabric using 150d/30f bulky polyester yarn was prepared and dyed using a jet dyeing machine using the following dyeing recipe 1. Dyeing prescription 1 Dianics navy blue SR-FS
(Mitsubishi Kasei disperse dye) 8% owf Dianex Blue U-SE (Mitsubishi Kasei)
1% owf Disper TL (dispersant manufactured by NICCA Chemical Co., Ltd.)
0.5 cc/Formic acid (40%) 0.1 cc/Bath ratio 1:20 Dyeing temperature, time 135°C x 30 minutes After dyeing, it was washed with water and then dried. Next, this dyed product was divided into 11 equal parts, and 9 of them were divided into 9 parts as shown in the column of the method of the present invention in Table 1.
Low-temperature plasma processing was performed using each type of gas under the following plasma processing conditions 1. The color fastness of the obtained fabric was measured and the results are shown in Table 1. Also, for comparison with the method of the present invention,
Of the 11 items above, one was left as an untreated cloth for comparison, and the other was subjected to reduction cleaning using the conventional reduction cleaning recipe 1 below, washed with water, dried, and dyed. Fastness measurements were made and compared with the method of the present invention. The results are shown in Table 1. Plasma treatment conditions 1 Processing gas Various (shown in Table 1) Processing pressure 0.5Torr Processing time 60 seconds High frequency frequency 13.56MHz High frequency output 300W Reduction cleaning prescription 1 Hydrosulfite 2g / Caustic soda 0.5g / Sunmoor RC (Nicca Chemical) Nonionic surfactant) 0.5g / Bath ratio 1:30 Treatment temperature 80℃ Treatment time 20 minutes

[Table] As is clear from Table 1, the method of the present invention:
Although there was some variation depending on the type of gas used, the color fastness was equivalent to that of the conventional method, that is, reduction washing, and it was confirmed that the method of the present invention has an excellent effect of improving color fastness. Example 2 A Georgette fabric (warp density 112 threads/inch, weft density 94 threads/inch) using highly twisted polyester filament 75d/48f yarn (twist number 2500T/M) was prepared. This fabric was subjected to graining and alkali weight reduction treatment. After that, it was dyed using a jet dyeing machine with the following dyeing recipe 2. Dyeing recipe 2 Diamondx Black RD-UP (disperse dye manufactured by Mitsubishi Kasei) 9% owf Diamondx Black FD-FF ( Mitsubishi Kasei disperse dye) 15% owf Formic acid (40%) 0.1cc / Dyeing temperature 135℃ Dyeing time 60 minutes Next, this dyed product was divided into 9 equal parts, and 7 of them were treated with oxygen, hydrogen, air, Low-temperature plasma treatment was performed using nitrogen, argon, helium, and carbon dioxide gases under the following plasma treatment conditions 2.The color fastness of the obtained fabric was measured, and the results are shown in Table 2. One of the above nine items was left as an untreated cloth for comparison, and the other one was subjected to reduction cleaning used in Example 1 for comparison between the method of the present invention and the conventional reduction cleaning method. Conventional reduction cleaning was performed using the recipe 1, and after washing with water and drying, the color fastness was measured and compared with the method of the present invention.The results are also shown in Table 2.Plasma treatment conditions 2 Processing gas Various types (shown in Table 2) Processing pressure 0.6Torr Processing time 60 seconds High frequency frequency 13.56MHz High frequency output 450W

[Table] As is clear from Table 2, the method of the present invention using oxygen, hydrogen, and air shows almost the same color fastness as the conventional reduction cleaning method. Despite being a time-consuming process, it was confirmed that the dye fastness improvement effect was comparable to that of conventional reduction washing methods. In addition, as a result of tests using gases that are neither oxidizing nor reducing (for example, argon, helium, etc.), a slight improvement in color fastness was observed, but the improvement was not to the same level as reduction cleaning. Example 3 Spun yarn ^60s /100% polyester short fibers
A cotton jersey knitted fabric using No. 1 was prepared, refined, and then dyed using the following dyeing recipe 3 using a jet dyeing machine. Dyeing recipe 3 Fluoron Red FL (disperse dye manufactured by Sandoz)
6% owf Miketone Discharge Blue RL (manufactured by Mitsui Chemicals) 0.3% owf Disper TL (dispersant manufactured by NICCA Chemical)
0.3g/Formic acid (40%) 0.1cc/Dyeing temperature: 130°C Dyeing time: 40 minutes After dyeing, washing with water and drying were performed. Next, this dyed product was divided into six equal parts, and four of them were subjected to low-temperature plasma treatment under the conditions of plasma treatment condition 3 below using the gas and treatment time shown in the column of the method of the present invention in Table 3. Ivy. The color fastness of the obtained fabric was measured and the results are shown in Table 3. In addition, one of the above six items was left as an untreated cloth for comparison, and the other one was prepared using the reduction cleaning recipe used in Example 1 for comparison between the method of the present invention and the conventional reduction cleaning method. Conventional reduction washing was performed using the recipe No. 1, and after washing with water and drying, color fastness was measured and compared with the method of the present invention. The results are shown in Table 3. Plasma processing conditions 3 Processing gas Various (shown in Table 3) Processing pressure 0.6 Torr Processing time Various (shown in Table 3) High frequency frequency 13.56MHz High frequency output 450W

[Table] As is clear from Table 3, it has been confirmed that the method of the present invention can provide almost the same effect of improving color fastness as the conventional reduction washing method.

Claims (1)

[Scope of Claims] 1. A polyester fiber characterized by dyeing a polyester fiber product, drying it without reduction washing, and then subjecting the fiber product to low-temperature plasma treatment with an oxidizing gas or a reducing gas. A method for improving the color fastness of products. 2 The low-temperature plasma of an oxidizing gas is generated by irradiating high frequency to oxygen or a mixture of oxygen and other gases at a reduced pressure of 0.1 to 10 Torr, and the low-temperature plasma of a reducing gas is a low-temperature plasma of 0.1 to 10 Torr. Improving color fastness of polyester textile products according to claim 1, characterized in that the low-temperature plasma is generated by irradiating high frequency to hydrogen or a mixed gas of hydrogen and other gases under reduced pressure. Method.