JPS6285071A - High temperature mercerization of polyester fiber - 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 high temperature purification of polyester fibers.

Polyester fibers are generally scoured at temperatures below 100°C for knitted or woven fabrics, but in order to improve dyeability and texture, polyester fibers, especially highly twisted woven fabrics, are scoured at temperatures below 100°C. Graining and relaxing processes are essential to increase added value, and it has been proposed to perform scouring at 100°C or higher for these purposes. At this time, if a normal surfactant is used for scouring, air bubbles are generated during the process, resulting in insufficient graining, unsatisfactory relaxation, and poor dyeability.

In addition, when the temperature exceeds 100℃, the pressure becomes high, so air is removed, but highly foamy substances will foam rapidly.
It has drawbacks such as causing trouble.

The present inventors have arrived at the present invention as a result of intensive research on the J method of high temperature scouring at 100°C to 180°C. That is, undeveloped 1y1 is a polyester fiber at a temperature of 100 ° C to 180 ° C. Aryl group.

EO nioxyethylene group, PO nioxypropylene group n: An integer of 4 to 50 m: An integer of 1 to 50 However,
The present invention provides a method for high-temperature scouring of polyester fibers, which comprises scouring in an aqueous system containing a nonionic surfactant represented by [12m].

Generally, in the case of polyester strong twist fabrics, weaving is done at the weaving stage! In order to improve Bj properties, polyacrylic acid glues with high bonding/heaving effects, esterified oils with smoothness, soricone oils, mineral oils, paraffins, concentrated i'Q-based wood IIH, etc. [7 Water-soluble polyacrylic resins, water-soluble polyester resins, water-soluble polyamide resins, water-soluble polyurethane resins, etc. are used in combination or separately. In order to effectively remove these substances, scouring is generally carried out at a temperature below 100° C. using a C anionic, amphoteric, or nonionic monosurface active agent in combination with alkaline shaving.

However, processed yarn fabrics using highly twisted yarns require high-temperature conditions of 100°C to 180°C in order to fully untwist them, and packaged liquid flow scouring machines have been developed with low bath ratios in order to save energy. Currently, it is being used more and more often. In this case, due to the foaming properties of the surfactant, air is
A low-foaming surfactant is indispensable because it causes staleness and a decrease in flow rate. In addition, in order to achieve sufficient texturing, a mechanical beating effect is required at a low bath ratio, and surfactants with high foaming properties are not effective in this respect as well.

However, polyester fiber binding contains the aforementioned water-insoluble oil and glue, and requires a surfactant with high emulsifying power.

At temperatures between 100'C and 180°C, with low foaming properties.
As a result of our studies regarding surfactants that have strong emulsifying power and do not separate in a scouring bath, we have found the following general formula:

When the number of carbon atoms in the alkyl group is smaller than 8, or in the case of an alkylaryl group where the number of carbon atoms in the alkyl group is smaller than 6, the penetrating power is high, but the emulsifying power is low, and when the number of carbon atoms in the alkyl group is larger than 36. , or an alkylaryl group in which the number of carbon atoms in the alkyl group is greater than 30, the water solubility was poor and a tendency for separation was observed. When the number of moles of propylene oxide added was greater than the number of moles added of ethylene oxide, the water solubility was similarly poor and there was a tendency for separation, and the detergency was also poor.

The sum of the number of moles of ethylene oxide added (n) and the number of moles of propylene oxide added (m) varies depending on the molecular weight of R, and in general, the larger R and the larger the number of n4m, the better the low foaming property and cleaning. Showed strength.

The reason why the compound represented by the above general formula exhibits excellent performance at high temperatures is not clear, but it is presumed that it lies in the balance between the penetrating power at low temperatures and the emulsifying power of oil at high temperatures.

The reason for this is that when R is an alkyl group with a carbon number of less than 8, which has a higher penetrating power, or when R is an alkyl group with a carbon number of less than 6, the penetrating power of the caustic soda used in combination with R is lower. Judging from the fact that the sizing agent undergoes rapid expansion at lower temperatures and incorporates insoluble resin and oil, there is a tendency for darkening and poor dyeability to occur. According to the above, it is considered that the material has a certain degree of penetrating power, and it is better to gradually untwist it to emulsify and disperse the oil before forming the grain.

It is well known that the compound represented by the formula -Ilu has a cloud point of 1 to 7;
Q Even on the high temperature side, there is no separation, so it becomes more cloudy and cloudy.
1. General alkyl polyethylene glycols, alkyl aryl polyethylene glycols, amphoteric surfactants, and anionic surfactants with high ',l' values may be blended to the extent that they do not inhibit low foaming properties.

The present invention will be specifically explained below using examples.

Example 1 Using the surfactants shown in Table 1, the results of tests on emulsifying properties and foaming properties at a temperature of 130°C are shown in Table 1.
Shown in 1.

In addition, for the emulsifying test, put 1 g/l of oil and 1 g/1400 cc of surfactant in a pressure-resistant glass container, and
After heating to ℃, the emulsification state was observed.

Evaluation method O: A cloudy, stable emulsified state is shown, and no separation is observed.

Δ: A cloudy, stable emulsified state is shown, but separation and oil droplets are observed.

×: Separation occurs without emulsification at all.

Example 2 Using various surfactants shown in Table 2, City I Temporary High Temperature High Pressure Rotary Washer FW-1009 [Fukujin Kogyo Co., Ltd.] was used. Polyester strong twist fabric 3 using IJ]
00 kg, surfactant 2 g/l and 1'Y soda (solid) 2 g/l, at a bath ratio of 1 lO, at a drum rotation of 15 revolutions and a temperature increase of 3"C/min from 50°C. 13
After 30 minutes at 0°C, it was cooled and tested for graininess and scouring properties. The results are shown in Table 2.

[Total 1 grain 0 yield 'fl'6-J: Shown as shrinkage -41 after treatment from face to face before scouring.

White melon: [1 piece Z-100 manufactured by Junshiki Kogyo Co., Ltd.
Measured using an OIDP type colorimeter.

Ether extraction rate: Measured by the Saw-2-Cuxley method [3 Makima]. [A large amount of extraction indicates insufficient refining.]

Claims (1)

[Claims] Polyester fibers are prepared at a temperature of 100°C to 180°C by the general formula R-O-(EO)n(PO)mH [R: alkyl group having 8 to 36 carbon atoms, 6 to 36 carbon atoms] An alkylaryl group having 30 alkyl groups, EO: oxyethylene group, PO: oxypropylene group n: an integer of 4 to 50 m: an integer of 1 to 50, where n≧m] 1. A method for high-temperature scouring of polyester fibers, which comprises scouring in an aqueous system containing polyester fibers.