JPH0390673A - Yellowing prevention processing of fiber cloth - Google Patents

Abstract

PURPOSE:To prevent yellowing of cloth after dyeing, finishing processing by treating fiber cloth comprising an amino groupcontaining or cationic finishing agent by low-temperature plasma. CONSTITUTION:Knitted or woven fabric, etc., comprising natural, semisynthetic fiber or synthetic fiber is provided with a finishing agent such as amino modified silicone derivative or a finishing agent (e.g. quaternary ammonium salt) having cationic properties and treated by low-temperature plasma to effectively prevent yellowing of cloth which has hitherto occurred frequently after dyeing and finishing processing.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for preventing yellowing of fabrics containing an amino group-containing finishing agent or a cationic finishing agent.

(Prior Art) When a textile fabric is dyed and finished and then wrapped in a normal packaging material and stored as it is, a part of the fabric turns yellow. A so-called yellowing phenomenon is often observed. This phenomenon is particularly common when a finishing agent containing an amino group or a finishing agent having cationic properties is used during finishing of the fabric.

Since pollutants in the atmosphere are involved in this yellowing phenomenon, a method has been proposed in which finished fiber fabrics and sewn products thereof are vacuum packaged in film bags or the like in order to prevent yellowing. Although this method is effective in preventing yellowing, packaging bags are usually packaged with the assumption that they can be opened at any time, so it is difficult to keep them completely sealed as is customary.

Another conventional method for preventing yellowing is to treat the fabric with a low-volatile organic acid such as citric acid during the final finishing process of the fabric. This is a method to prevent color development due to alkali sensitization, but in this method, keeping the fabric at a slightly acidic pH of about 6 has a poor yellowing prevention effect, and if the pH is lower than this, yellowing will occur. Although it is effective in preventing staining, it is not practical because it may cause problems such as decomposition of the dye and embrittlement of the fiber due to rR.

The reality is that a method for rationally preventing yellowing of fiber fabrics after finishing has not yet been developed.

(Problems to be Solved by the Invention) The present invention was made in view of the current situation, and aims to prevent yellowing of fiber fabrics that have been finished with a finishing agent containing an amine group or a finishing agent having cationic properties. The purpose is to obtain a processing method that prevents this from occurring.

(Means for Solving the Problems) The present invention achieves the above object and has the following configuration.

That is, the gist of the present invention is a method for preventing yellowing of a fiber fabric, which is characterized by subjecting a fiber fabric containing a finishing agent containing an amino group or a finishing agent having cationic properties to a low-temperature plasma treatment.

The present invention will be explained in detail below.

In the present invention, a fiber fabric containing a finishing agent containing an amino group or a finishing agent having cationic properties is used as a target for anti-yellowing treatment.

The fiber fabrics mentioned here include natural fibers such as cotton, wool, silk, and hemp, semi-synthetic fibers such as viscose rayon and acetate fibers, and synthetic fibers such as nylon fibers, polyester fibers, polyacrylonitrile fibers, and vinylon fibers. Two knitted fabrics made of single fibers.

It means a 1-meter woven fabric made of a nonwoven fabric or a blended yarn or mixed yarn using a combination of two or more of these fibers.

The finishing agent containing an amino group or the finishing agent having cationic properties used in the present invention includes a low molecular compound having an amino group, a high molecular compound, a low molecular compound having cationic property,
Softening agents for fiber finishing made of polymer compounds, etc.
Examples include resin finishing agents, surfactants, fixing agents, water repellents, flame retardants, sanitary finishing agents, binders, etc. Specifically, amino-modified silicon derivatives, polyamide derivatives, fatty acid amide derivatives, alkyl amides derivative.

Softening agents such as polyamine derivatives, organic amines.

Melamine-based, amide-based resin finishing agents, organic amine salt-based catalysts, polyamine-based, quaternary ammonium salt-based, polyamide-based, dicyandiamide-based fixing agents, quaternary ammonium salt-based, polyamide-based, nitrogen-containing compounds, etc. , surfactants such as organic amine derivatives, phosphorus-based compounds, and phosphoric acid aminoblasts.

Examples include flame retardants such as phosphoric acid amide and sanitary finishing agents such as quaternary ammonium salts.

These finishes are applied to the #a fiber fabric by conventional methods in the final step of processing the #a fiber fabric.

In the present invention, the above-mentioned fabric to be processed containing a finishing agent containing an amine group or a finishing agent having cationic properties is subjected to low-temperature plasma treatment.

Known equipment for performing low temperature plasma treatment.

For example, "Journal of Textile Machinery Society" Volume 38, Nα4 (19
The following apparatus can be used, as described on page 188 of 1985).

This device has a pair of electrodes for discharge inside a vacuum container that can maintain a low pressure, and has a structure that allows a specific gas to be introduced at a predetermined flow rate, and an attached vacuum pump to evacuate the inside of the container and maintain a constant pressure. It is a device that has the following performance. When a voltage is applied to the electrodes in this device, a glow discharge occurs, and the introduced gas becomes a low-temperature plasma. Most commonly, a high frequency power of 13.56 M)Tz is applied. Low-temperature plasma treatment can be performed by passing the fabric to be treated at a desired speed through a low-temperature plasma atmosphere formed between electrodes.

Specifically, first, the fabric to be treated is placed in a vacuum container, and the internal pressure is reduced to 0.01~0.
Adjust to 10 Torr. Next, a predetermined gas is introduced and adjusted to 0.1 to 5 Torr. The gases used at this time are oxygen, nitrogen, and argon.

Various gases can be used, such as helium, ammonia, and air. Oxygen, air, and argon are usually preferred. When a predetermined gas is introduced and high frequency power is applied to the electrodes in the container while the pressure is adjusted to 0.1 to 5 Torr, the introduced gas becomes a low-temperature plasma state.

High frequency power is 0.1 to 5w/crl (unit area of electrode)
The degree is appropriate. By passing a fabric previously housed in this low temperature plasma atmosphere.

Low temperature plasma treatment can be performed. The treatment time is usually several seconds to 300 seconds, preferably 30 to 180 seconds.

By performing the above-mentioned low-temperature plasma treatment, it is possible to obtain a fiber fabric that has been subjected to the yellowing prevention treatment of the present invention.

The present invention has one or more configurations.

(Function) The reason why the low-temperature plasma treatment of the present invention can prevent yellowing of fiber fabrics containing finishing agents containing amine groups or finishing agents having cationic properties is not necessarily clear. 9 The present inventors conjecture as follows.

Phenolic derivatives, which are considered yellowing substances, are commonly used as antioxidants in packaging materials. It is thought that this causes yellowing when it comes into direct contact with textile fabrics or transfers to the fabric surface through sublimation, and interacts with atmospheric pollutants, but yellowing occurs on all fabrics. It is characterized by the fact that it occurs not only in one localized area.

This is thought to be due to the presence of some third factor in addition to the phenol derivatives and atmospheric pollutants. Furthermore, considering that yellowing is likely to occur when finishing agents containing amino groups or finishing agents with cationic properties are used as finishing agents, the third factor mentioned above is It is assumed that this is a finishing agent. It is presumed that this finishing agent acts as a catcher for phenolic derivatives and atmospheric pollutants, or plays a certain catalytic role in the yellowing reaction. When low-temperature plasma treatment is applied to a fabric containing a finishing agent containing amino groups or cationic properties that are likely to cause such effects, the low-temperature plasma also acts on the finishing agent in the fabric, blocking the amino groups in the finishing agent. It is speculated that yellowing can be prevented by eliminating the catalytic action of yellowing by modifying the cationic properties.

(Example) Next, the present invention will be explained in more detail with reference to an example, in which the performance of the fabric in the example was measured.

The evaluation was performed using the following method.

(1) Yellowing test method ■ After immersing a sample in a 1% alcohol solution of a phenolic derivative (butyl hydroxyl toluene), the alcohol is vaporized. Then, using a nitrogen oxide gas fastness tester.

Approximately 500 ppm of nitrogen oxide gas is generated using phosphoric acid and nitrous acid, and the fabric is treated in an atmosphere at 30° C. for 2 hours to obtain a fabric to be evaluated immediately after the yellowing test.

■ Use the fabric to be evaluated immediately after the yellowing test in item ■ above as the base fabric,
The same fabric that has not been subjected to the yellowing test is layered on top of the attached fabric, and both the base fabric and the attached fabric after being left for 7 days are used as fabrics to be evaluated.

(2) Yellowing evaluation method The following four-level evaluation was performed by visual judgment.

○: No yellowing △: Slightly yellowed ×: Yellowed X×: Severely yellowed Example 1 A bleached twill fabric made of 100% cotton was prepared and Pararesin DSN-2 (manufactured by Daigan Palladium Chemical ■, cationic polymer resin finishing agent) 45 g/1, and Parasilicon Softener xc-y <manufactured by Ohara Palladium Chemical ■, amine-modified silicone softener) 30 g/12 After impregnating the treatment liquid and squeezing with a mangle at a liquid squeezing rate of 60%, ■00
Dry for 2 minutes at °C.

The resulting soft finished cotton fabric was divided into three parts.

One of them was subjected to low-temperature plasma treatment under the following low-temperature plasma treatment conditions i to obtain an anti-yellowing processed fabric of the present invention.

Low temperature plasma treatment conditions 1 Gas type Oxygen 100% Gas flow rate 5f/min Vacuum degree I Torr High frequency output 0.5w/crl (electrode area) Treatment time 60 seconds One of the fabrics divided into three for comparison with the present invention 3. According to the conventional method.

Soaked in 0.4g/it of citric acid and squeezed with a mangle at a rate of 6
After squeezing the liquid at 0%, drying at 100°C for 2 minutes,
A comparative anti-yellowing fabric was obtained.

The remaining one of the three divided fabrics was used for comparison as an unprocessed fabric in the present invention.

The performance of the inventive and comparative fabrics was measured and evaluated.

The results are shown in Table 1.

Table 1 As is clear from Table 1, the anti-yellowing fabric of the present invention subjected to low-temperature plasma treatment has an excellent anti-yellowing effect compared to the yellowing of untreated fabric. I know that there is. In addition, the results after being left for 7 days showed that the conventional method treated with citric acid had a large yellowing of the base fabric and the attached fabric was also slightly yellowed, whereas the fabric treated with low-temperature plasma treatment The anti-yellowing fabric of the present invention did not show much yellowing.

Further, by evaluating the attached fabric after being left for 7 days, it was found that the anti-yellowing treated fabric of the present invention also has the effect of preventing yellowing due to dye migration of phenolic derivatives.

In addition, there is a fabric processed to prevent yellowing by the method of the present invention.

There were no particular problems with the texture.

(Effects of the Invention) The present invention has a configuration in which a fabric containing a finishing agent containing an amino group or a finishing agent having cationic properties is subjected to low-temperature plasma treatment, and according to the method of the present invention having such a configuration, It is possible to prevent yellowing of fabrics containing a finishing agent having cationic properties or a finishing agent having cationic properties.

Claims (1)

[Claims] (1) A method for preventing yellowing of a textile fabric, which comprises subjecting a textile fabric containing an amino group-containing finishing agent or a cationic finishing agent to low-temperature plasma treatment.