JPS59173372A - Feeling improvement of polyester fiber fabric - 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 The present invention relates to a method for improving the feel of polyester fiber fabrics.

Conventionally, as a method for improving the feel of polyester fiber fabrics, an alkali weight loss processing method has generally been adopted as the most effective method.

This method requires a large amount of alkali (such as caustic soda) and has the disadvantages of requiring high temperature and long processing times. Therefore, the goal of improving the alkali j1g processing method was to improve the alkaline hydrolysis rate of polyester, reduce the amount of alkali used, lower the treatment temperature, and shorten the treatment time. Therefore, as an improvement method, it has been proposed to use quaternary ammonium salts as alkaline hydrolysis accelerators to accelerate the rate of alkaline hydrolysis, and this has been adopted in some cases, but the process lacks uniformity. In other words, it was not a satisfactory improvement method because it had drawbacks such as variations in the texture of the processed product, a partial decrease in strength, and discoloration depending on the type of quaternary ammonium salt. .

The present invention was made in view of the current situation, and an object of the present invention is to establish a method for rapidly and uniformly reducing the amount of polyester fiber fabric with alkali.

In order to achieve this object, the present invention has the following configuration.

This is a method for improving the texture of polyester fabrics.

The present invention will be explained in detail below.

In the present invention, first, a polyester fiber fabric is subjected to low temperature plasma treatment. The polyester fiber fabric as used in the present invention means a fabric made of polyethylene terecrate fibers or copolymerized polyester fibers made by copolymerizing terephthalic acid and ethylene glycol with a third component. Furthermore, low-temperature plasma refers to a system in which electrical energy is applied to a low-pressure gas of 0.1 to 10 Torr to cause a glow discharge, and the waste molecules are ionized or excited, and the object to be processed is processed in this atmosphere for a certain period of time. This is called low-temperature plasma treatment.

It is known that treating polymers with low temperature plasma can change the surface properties of the polymer. For example, argon is used as the gas and the temperature is 0.5 Torr.
When polyethylene resin is treated with low-temperature plasma for 30 to 60 seconds using low-temperature plasma generated by applying high-frequency power of 56 MI+z, the water wetting properties of polyethylene are improved and the adhesive strength is greatly improved.

It is possible to improve the surface properties (hydrophilicity, antifouling properties, etc.) of polyester fiber fabrics by subjecting them to low temperature plasma treatment, but it is extremely difficult to improve the texture using only low temperature plasma treatment. This is because when modifying a polymer by low-temperature plasma treatment, the effect is limited to only a very thin surface layer and does not reach the inside.

When using low-temperature plasma using pure oxygen or air as the gas, polyester fibers are decomposed from the surface and a type of weight loss treatment is possible, but in this case, the reaction requires a very long treatment time and was difficult to perform in the experiments conducted by the present inventors. The results showed that even under the most efficient conditions, oxygen plasma treatment required at least 30 minutes of treatment to achieve a weight loss of 10% (percent weight loss relative to the weight of untreated fabric).

The present invention aims to efficiently improve the feel of polyester fibers, which is extremely difficult to achieve by low-temperature plasma treatment alone, by combining it with a subsequent alkali treatment.

The conditions for generating low-temperature plasma are not particularly limited. That is, any general low-temperature plasma generation conditions can be applied, and appropriate conditions may be set depending on the denier of the polyester fiber to be treated, the structure of the fabric, etc. Examples of low-temperature plasma generation conditions include gases used: 02, N2, Ar.
+ Air, etc., pressure 0.1-2'I'orr, gas flow 'M
1 to 2 On/min -m (Volume (β) of gas in standard state per unit time (minute) for unit area m' of treated fabric), applied power 13.56 Mllz high frequency power was applied to capacitive parallel electrodes. 0.1 W/rrF,
The processing time can be 0.5 to 2 minutes. When a polyester fiber fabric is subjected to low-temperature plasma treatment under these conditions, radicals are formed in the polyester molecules, and hydrophilic groups such as carboxyl groups are also formed, resulting in hydrophilicity, water absorption, and waterproof properties as general low-temperature plasma treatment effects. The stain-resistant surface modification effect is achieved. However, what is noteworthy here is that the present inventors have discovered that when this low-temperature plasma treatment is combined with alkali weight loss treatment, the rate of alkaline hydrolysis can be dramatically improved, an effect that was previously not expected. It is. This is because the polyester molecules 8.1'4 change in fiber structure due to the formation of hydrophilic turbulence due to the low temperature plasma treatment, and furthermore, the originally smooth fiber surface becomes uneven due to the ethoning effect, which essentially causes the alkaline hydrolysis reaction to occur. Possible reasons include an increase in the contributing surface area.

Therefore, in the present invention, the polyester fiber fabric that has been subjected to the low-temperature plasma treatment is then subjected to an alkali weight loss treatment.

This alkaline weight loss treatment may be carried out by the commonly used alkali treatment method, specifically, caustic soda 20 to 70 g/1 and nonionic penetrant 0.5 to I.
g/ff, bath ratio 1:20 to 1:40, temperature 80°C to 1
The treatment can be carried out by immersion treatment or treatment using a dyeing machine for a treatment time of 1 to 4 hours at 00° C., or by padding with a caustic sorter aqueous solution and steaming treatment with a steamer.

In the method of the present invention, which performs alkali reduction treatment after low-temperature plasma treatment, the rate of alkaline hydrolysis is increased, so when the caustic soda concentration and treatment temperature are the same under the above conditions, the treatment is compared to the conventional method. large amount of time [1]
It can be shortened to

In other words, when an untreated polyester fiber fabric and a polyester fiber fabric treated with low-temperature plasma according to the method of the present invention are subjected to alkali weight loss treatment under the same conditions, the result of the method of the present invention is compared to the untreated one. The weight loss rate is about 2
Improves to twice as much. However, the method of the present invention requires about half the processing time to achieve the desired weight loss rate obtained with the conventional method, resulting in significant energy savings. Moreover, the texture and performance of the polyester fiber fabric after weight loss processing obtained by the method of the present invention are completely the same as long as the weight loss rate is the same. Problems such as variations in texture, variations in strength reduction, and in some cases yellowing due to uneven partial weight loss, as in the case of , do not occur at all.

Furthermore, the method of the present invention can be effectively used in cases where it is advantageous to lower the treatment temperature due to problems with the equipment that performs alkali weight loss treatment. The treatment temperature is 20-30'
You can also get the same '61 rate with a mustard with a C drop.

The present invention has the above-mentioned structure, and the method of the present invention can improve the texture as good as the conventional alkaline mQMk treatment in a very quick, uniform, efficient, and energy-saving manner. can.

Next, the method of the present invention will be explained with reference to Examples.

(The present invention is not limited to this in any way.)

Example 1 A scouring polyester fabric (warp 75d, weft 75d, warp density 140 threads/inch, weft density 98 threads/inch) was prepared, and it was divided into two, each with sample No. 1 and 1llo. 2 was added. Sample No. 1 was subjected to low temperature plasma treatment under the following low temperature plasma treatment conditions 1.

Low temperature plasma processing conditions 1 Gas: Air Gas flow rate: 1. ! M/min-tri vacuum degree: 1.0 Torr High frequency type crab 13.56 Mllz 0.7 匈/C Self-treatment time = 60 seconds Next, No. 1 treated with low temperature plasma and No. 1 without treatment
Each of the samples No. 2 was subjected to a weight loss treatment under the following alkali weight loss condition 1, and the weight loss rate of each was measured. Incidentally, the weight loss rate was calculated using the following formula (A-B)/A X100, where A is the weight before treatment and B is the weight after treatment.

Alkali weight loss conditions l Na011: 40g/(1 nonionic activator: 1g/β/valley ratio: 1:40 treatment 72!,
The measurement result of the weight loss rate was as follows.

No. 1 (method of the present invention) 27.5% No. 2 (tM method) 13.6% The sample of No. 1 after treatment, that is, the one by the PJ method of the present invention, has a weight loss rate from No. 2. It was large, extremely flexible, and had an excellent lull, and there was no variation in the lull.

Further, there was no discoloration, and there was no particularly brittle H:HB content.

Claims (1)

[Claims] (]) Polyester fiber fabric is subjected to low-temperature pressma treatment,
A method for improving the feel of a polyester fiber fabric, which is then subjected to an alkali weight loss treatment.