KR930011341B1 - Process for preparation of water absorbent and fast dry cloth - Google Patents

Abstract

weaving or knitting using the wind- mill shaped composite fiber as a weft yarn, which is composed of the first component of fiber-forming polyamide added by 0.5 wt.% - 10 wt.% of polyester and the second component of fiber- forming polyester, while the extrasion rate of both of which satisfies the eq. 0.7 <= N/W <= 0.95 (where N is the fiber's weight after weight-reduction treatment, W is the weight of the whole fiber); weight-reducing so that the composite fiber's cross-section becomes wind-mill shaped one, and micropores form on the fiber's surface, so that the result satisfies the eq. α = 360≰ /n, 30≰<= α <= 90≰ , 4 <= n <= 12 (where is angle between each wing of the wind-mill shaped fiber, and n is the number of wings).

Description

Method of making absorbent quick-dry fabric

1 to 3 are cross-sectional views of a windmill type composite fiber usable in the present invention.

4 to 6 are cross-sectional views of the windmill-like composite fibers after alkali weight loss processing.

The present invention relates to a method of manufacturing a soft and absorbent quick-drying knitted fabric having a soft feel, and more specifically, a windmill-type composite fiber filament composed of fiber-forming polyester and polyamide In the production of a small amount of polyester added to the polyamide portion of the mixed spinning spinning windmill-type composite fibers using a weft, and by reducing the alkali (alkali) reduction process windmill cross-section of the windmill-type composite fibers to windmill wings The capillary phenomenon that occurs in the micro slit formed between the blades and wings and the composite synergistic effect of the micropores formed on the surface of the fiber not only give excellent absorption quick-drying, but also because of the crunchy texture that the micro slit gives In the manufacture of the absorption fast-drying knit fabric which the soft feeling by the soft cooling and weight loss processing appears It is about.

Polyamide-based fiber is a fiber made from a polymer having an amide bond as a raw material, and there are nylon 6, nylon 66, nylon 11, and the like, and it is widely used in various clothes, but has a large hydrophobic problem.

Many methods have been investigated to improve the hydrophobicity, the biggest drawback of polyamide-based fibers. For example, Japanese Patent Publication No. 79-40680 describes a method of fixing a hydrophilic monomer onto a synthetic fiber surface, and Japanese Patent Application Laid-Open No. 77-85518 and Japanese Patent Publication No. 79-38663 describe A method of complex spinning a hydrophilic polymer is described, and Japanese Patent Application Laid-Open No. 85-194116 discloses a method of using hollow modified fibers for post-processing hollow fibers mixed with metal sulfonic acid salts to form micropores. Patents 81-112535 and 85-259618 describe methods using special shaped cross-section yarns.

However, among these methods, the hydrophilic monomer fixing method has a disadvantage in that the feel of the knit fabric is hard and the washing durability is insufficient, and the composite spinning method has a disadvantage in that the comfort is reduced due to the fast drying of moisture because the water absorption is improved but the moisture is slow.

Therefore, the method currently commercialized is a method using a hollow modified fiber and a special shaped cross section yarn, the hollow modified fiber has a process difficulty to modify the micropores of the fiber surface to the hollow part, the special shaped cross section yarn has a capillary effect Due to the rapid movement of moisture, the quick drying property is good, but there is a problem that it is difficult to radiate a sectional cross-section yarn that gives a sufficient capillary effect as well as the absorbency is lower than that of the surface modified fiber.

Accordingly, it is an object of the present invention to provide an absorbent quick-drying knit fabric having a soft feel and a refreshing feel. Another object of the present invention is to provide a method for producing a knitted fabric of the above object. In order to achieve the above-mentioned objects as well as other objects that can be easily expressed, in the present invention, after splicing two kinds of polymers having different alkali reducing properties and eluting one component with an alkali weight loss, the special mold cross-section yarn is easily In addition to producing a small amount of alkali-reducing polymers to a polymer component that is not alkali-loss, mixed complex spinning is performed to reduce special alkali cross-sectionalization and surface modification simultaneously by reducing alkali. A knitted fabric was prepared.

The present invention is described in more detail as follows. 90 to 99.5% by weight of polyamide and 0.5 to 10% by weight of polyethylene terephthalate as a first component and PET as a second component are melt-composited and wound and cross-sectional as shown in FIGS. After producing an undrawn yarn having a stretched and heat-fixed it to produce a windmill cross-section composite fiber.

After weaving the PET fiber in a ramp, the windmill cross-section composite fiber produced by the above-described method as a weft yarn, and then scouring, alkali-reduced processing and then washed with water to prepare the absorbent quick-drying knitted fabric of the present invention.

As the alkali-reducing polymer used in the production of the composite fiber of the present invention, fiber-forming polyesters and copolymers thereof represented by polyethylene terephthalate (hereinafter referred to as PET) can be used. All of the fiber forming polyamides represented by (Nylon) 6 or 66 can be used.

The composite fiber used in the present invention has a cross-sectional shape as shown in Figs. 1 to 3 and is made of windmill cross-section fibers as shown in Figs. 4 to 6 by alkali reduction processing, respectively.

At this time, the acute angle α between the windmill blade and the blade is given by the following equation (1), and the degree of capillary phenomenon varies according to α.

Where n is the number of windmills

If α is larger than 90 °, there is almost no capillary phenomenon. If α is smaller than 30 °, complex spinning is difficult and cross-sectional shape is unstable, making wing formation difficult due to alkali reduction.

Therefore, it is good to make α and n into the range which satisfy | fills following (2) Formula.

The blade length is related to the discharge ratio of the two polymers, and the discharge ratio should satisfy the following formula (3).

However, N / weight of the fiber after weight loss, W: total weight of the fiber

If the N / W is less than 0.7, the wing length is too long, so that the composite spinning is difficult, and the fiber strength is lowered. If the N / W is greater than 0.95, the wing length is too short and the capillary phenomenon is insufficient.

In this case, N / W may be approximately expressed by the following equation.

(Where R is the radius of the fiber before weight loss)

r: radius of concentric circles inside the fiber after weight loss

R-r: Wingspan)

In addition, capillary phenomenon occurs when windmill cross-section fiber is simply spinning with composite spinning of polyester and polyamide, but capillary phenomenon occurs, but this does not give sufficient absorbency. Therefore, the polyamide constituting the windmill cross-section fiber needs to be surface modified.

Unlike polyesters, the surface modification of puliamide fibers requires acid reduction, which leads to complex process and safety problems due to the use of strong acids and corrosion of weight loss containers.

Therefore, the present inventors added a small amount of polyester during polyamide spinning and mixed spinning after sufficient agitation, thereby simultaneously windmill sectioning during alkaline weight loss processing and simultaneously dissolving polyester dispersed in polyamide to modify the surface of the polyamide windmill cross-section fiber. This made it possible.

In this case, the polyester added to the polyamide is preferably 0.5% by weight or more and 10% by weight or less. If it exceeds 10% by weight, dispersibility is a problem, the threading phenomenon increases during spinning, and the strength of the yarn after processing is lowered. When used at less than 0.5% by weight, the effect of the modification is weak and sufficient absorption is not obtained.

The following examples further illustrate in detail the process for preparing the absorbent quick-drying knitted fabric of the present invention, but are not intended to limit the scope of the present invention.

EXAMPLE

95% by weight of nylon 6 having a relative viscosity of 2.6% and 96% sulfuric acid and 5% by weight of PET having an intrinsic viscosity of 0.64 measured at 25 ° C. as the first component Then, melt spun spun at a discharge ratio of 8: 2 using PET 100% as a second component, and wound at a speed of 1,500 m / min to obtain an undrawn yarn having a cross-sectional shape as shown in FIG. This was stretched three times at 130 ° C. and heat-set with a hot plate at 150 ° C. to obtain a windmill section composite fiber having 75 denier 36 filaments.

Continuous refining machine after weaving with 75 denier 36 filament PET fiber and weft weaving composite fiber obtained above as weaving with twill having a density of 120 warp yarns per inch and 80 weft yarns. In the usual manner, the fine scouring was carried out, and the mixture was preset at 180 ° C. for 30 seconds, and then subjected to alkaline weight reduction under the condition of (A) in a circular dyeing machine, washed with water, and dyed under the condition of (B).

The reduction rate was 20%.

The absorption rate, absorption travel distance, absorption rate, drying rate and flexibility of the dyeing cloth were evaluated and shown in the first table.

Comparative Example 1

The same procedure as in Example was conducted except that the first component was 100% nylon 6. The reduction rate was 18%.

Comparative Example 2

In the examples, weaving was performed using general nylon 6 fibers of 70 denier 24 filaments instead of windmill cross-section composite fibers as the weft yarn, and the same procedure as in Example was performed.

Comparative Example 3

The dyeing cloth obtained in Comparative Example 2 was padded with 85% of pick-up in a solution having the same composition as in (C), and then steamed for 1 minute with 104 ° C steam and heated to 80 ° C hot water. Washed with water.

[Comparative Example 4]

The core component is a mixture of 20% by weight of PVA having a degree of polymerization of 1,500 and a degree of saponification of 45% and a propionic acid ester of glycerine with respect to 100% by weight of PVA, and nylon 6 sheath. ), The core / sheath ratio was 30/70, and melt spun at 235 ° C., followed by stretching 3.5 times at 100 ° C. to obtain 75 denier 36 filament composite fibers.

Conventional method in continuous refining machine using 75 denier 36 filament PET fiber for warp and weaving with twill having density of 120 warp yarn per inch and 80 weft yarn using composite fiber obtained above The scouring was carried out and then preset at 180 ° C. for 30 seconds, and then stained under the condition of (B) in a Sucura dyeing machine.

TABLE 1

* L ₀ : Before Washing

L ₃₀ : After washing 30 times with a domestic washing machine

(Liquid ratio 1: 30, detergent 1g / ℓ)

1. Absorption rate: KSK 0815 (1986) 5.27.1. Measured by method A (dropping method)

2. Absorption travel distance: KSK 0815 (1986) 5.27.1. Measured by the B method

3. Absorption rate: KSK 0815 (1986) 5.27.2. Measured by law

4. Drying speed: KSK 0815 (1986) 5.28.1. Measured by the A method

However, in order to compare the drying rate per unit weight,

Time divided by absorption.

5. Drape coefficient: KSK 0815 (1986) 5.21. Measured by the E method

Claims (4)

After weaving a small amount of polyester into the fiber-forming polyamide as a first component and using a windmill-type composite fiber manufactured with the fiber-forming polyester as a second component as a weft, a weight loss process was performed. Method of manufacturing a water-absorbing quick-drying knitted fabric, characterized in that the windmill cross-section of the windmill-type composite fiber to form micropores on the surface. The method according to claim 1, wherein the angle between the blades and the number of blades of the blades of the windmill-type composite fiber satisfy the following formulas (1) and (2). (Wherein α is the angle between the wings and n is the number of wings) The method of claim 1, wherein the discharge ratio of the first component and the second component satisfies the following formula (3). (Wherein N is weight after weight loss and W is total weight of fiber) The method of claim 1, wherein the amount of polyester added in the first component is 0.5% by weight to 10% by weight.