JPS62191569A - Plasma treatment of fiber structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for efficiently plasma-treating a fibrous structure.

[Prior Art] In recent years, various attempts have been made to impart various performances to fiber structures by plasma treatment.

[Problems to be Solved by the Invention] However, these techniques mainly focus on improving properties, and none are intended to improve the efficiency of low-temperature plasma processing.

The present invention provides targeted performance in a short time, uniformly, efficiently, and reliably.

[Means for Solving the Problems] That is, the present invention provides a fiber characterized in that when the fiber structure is subjected to plasma treatment, the solvent and water contained in the fiber structure are reduced to 3% or less of the weight of the fiber. This is a plasma treatment method for structures.

Since the plasma treatment is a treatment method that utilizes spark discharge generated in a vacuum as described later, it is necessary to introduce the fibrous structure into the vacuum system. However, it has been found that the gas and liquid contained in the fibrous structure are extremely important in achieving a vacuum system. For example, in systems containing associative compounds or high-boiling compounds such as water,
The higher the degree of vacuum, the more gasification occurs, so it is often experienced in chemical experiments that it is difficult to obtain a satisfactory degree of vacuum.

The present inventors focused on the fact that it takes an extremely long time to achieve a vacuum in the plasma treatment of fiber structures, and the fact that it is difficult to perform a process with excellent uniformity. It was determined that water is the solvent in which the substance is present.

Among them, water, which is commonly used as a treatment liquid, is contained in the outside air even if it is not a treated product, and this enters the interfiber voids and hydrophilic parts of the structure, making it difficult to handle.
We focused on the fact that the degree of vacuum was significantly reduced. This tendency varies considerably depending on the fiber material of the structure, and affects the time required to reach vacuum.

It is important and necessary to limit such solvents and water to 3% or less, preferably 2% or less, and generally 1% or less of the weight of the fiber structure. If it exceeds 3%, there is the problem that the time required to reach vacuum becomes longer, but there is also the disadvantage that uniform processing becomes more difficult.

In particular, once water is contained in a fiber structure, it is difficult to eliminate it, and it is difficult to completely dry it to substantially 0%.

As a method for achieving such a solvent or water content, normal liquid separation and deliquing methods such as centrifugation, heating, and removal under reduced pressure can be applied, but depending on the nature of the processing agent (compound) contained in the fiber structure, You need to choose accordingly. For example, for materials that can be thermally decomposed, it is essential to dry them at low temperatures, while for dyed materials, contact drying using a heating plate, etc., has the disadvantage of being prone to discoloration.

In any case, a low-temperature, non-contact drying method is preferably applied, but what is important is that the degree of drying is 3% or less of the fiber weight.

If these conditions are not satisfied, a serious problem arises in that the target processing performance cannot be achieved due to the presence of generated solvent gas, water vapor, etc.

The low-temperature plasma treatment as used in the present invention is a treatment in which the fibrous structure to be treated is not exposed to plasma discharge generated by applying a high voltage. Although there are various forms of such discharge, such as spark discharge, corona discharge, and glow discharge, glow discharge is particularly preferred because the discharge is uniform and the radical forming effect is excellent. Such a glow discharge is 5 Q tor
The discharge form is generated under a vacuum of less than r, preferably less than 2 Q torr, and in particular, a reduced pressure condition of 0.01 to 10 torr is selected from the viewpoint of stability.

The plasma treatment time varies depending on the type of fiber and treatment equipment, but is usually from several seconds to several minutes, preferably 1 hour.
It is about seconds to 5 minutes.

As the atmospheric gas for such plasma processing, for example, A
r, N2, He, CO2, Co, 02, N20,
Examples include air and NH3, but especially Ar and He.
, N2, Co, etc. are preferable in terms of effectiveness.

The fiber structure referred to in the present invention may be any fiber material, whether natural or synthetic.

Further, the present invention is not limited in its form. Examples include cotton, tow, sliver, thread, and fabrics (including knitted fabrics and non-woven fabrics).

The 181M structure on the grain may be impregnated or coated with a polymeric elastomer, such as urethane resin, acrylic resin, silicone resin, fluororesin, etc., and the grain may be coated with dyes, pigments, antioxidants, etc. in advance. May contain.

Next, the present invention will be explained in more detail with Examples [Example] = 5 One example: Polyester (150d, 48fi1.>
A fabric made of 100% polyester/wool was immersed in a treatment solution containing 2 (]/l of nonionic activator and 1 g/l of soda ash, scoured at 98°C for 30 minutes, thoroughly rinsed with water, and... This dried fabric was dried for 20'CX.
It was left to stand for 24 hours in a constant temperature room at 65RH for secondary drying. This secondary drying usually reduces the moisture content to about 5% or less, but the moisture content in this fabric was 4.28%.

This second-dried fabric is then tertiary-dried to the target moisture content.

Drying was performed in a constant temperature room at 120'C, and the moisture content was adjusted to 0.4%.

This fabric and the second dried fabric were subjected to low temperature plasma treatment under the following conditions for the purpose of imparting SR properties.

[Plasma treatment conditions] Atmosphere gas: Ar 50cc/min Depressurization degree: 20.7 torr = 6- Applied voltage: 1.5KV Processing speed: 20cm/min The treatment status of the plasma-treated fabric was observed.

[Stain removal properties] 0.5 cc of heavy oil B was dropped onto the treated fabric and left in the device for -1 day, followed by "Zab" [anionic detergent manufactured by Kao Soap Co., Ltd.] 2
The aqueous solution containing g/l was loaded into a washing machine along with sample 1, washed at a bath ratio of 1:50 for 40'CX for 10 minutes, dehydrated, thoroughly washed with water, dehydrated again, and dried for 80'CX for 20 minutes. . This cycle was repeated five times.

[Before washing] refers to the performance when the treated fabric before the above washing is washed once for 5 minutes in a washing machine using a 2g/l aqueous solution (40'C) of "ZABU" It was evaluated.

The evaluation was based on the color fastness test gray scale specified in JIS L-0805.

It is clear from Table 1 that J: Sea urchin treated in the present invention had extremely good SR properties.

On the other hand, the comparative example had a low level of SR property, and the stain did not come off even when rubbed by hand, but it had hygroscopicity.

Table 1 [Effects of the Invention] The present invention efficiently and reliably imparts target performance when treating fabrics by plasma treatment, thereby improving treatment efficiency to the latter group and It is possible to reliably provide the target performance.

Claims (1)

[Claims] (1) A method for plasma treatment of a fibrous structure, which comprises reducing the amount of solvent and water contained in the fibrous structure to 3% or less of the weight of the fiber when plasma-treating the fibrous structure.