KR0126618B1 - Process for producing the hollow type filaments with excellent solubility - Google Patents

Abstract

A polymer for a core is flowed in (1) part, and into (2) part, the polymer for the sheath is flowed, and as the polymer for sheath covers around the polymer for the core, through the final nozzle, the cross-section of sheath core shape is formed and reeled. Besides, by weight loss of the sheath part(4) in the erupting process, the cave is formed through outward and inward of the sheath, through which, the polymer for a core(3) comes out, forming the hollow.

Description

Manufacturing Method of Heavy Hollow Fiber with Excellent Elution

1 is a cross-sectional view of the spinneret used in the present invention.

2 shows one hollow fiber formed by elution.

3 is a cross-sectional photograph after spinning.

4 is (a) and (b) are hollow fiber cross-sectional photographs after the core component polymer is pulled out.

* Explanation of symbols for main parts of the drawings

1: polymer injection hole for core 2: polymer injection hole for sheath

3: core part 4: sheath part

5: core component polymer 6: cis component polymer

7: A goal connecting the inside and the outside of the sheath part.

The present invention relates to a method for producing high hollow fiber excellent in elution, and more particularly, to a method for producing high hollow fiber excellent in elution by using a polymer for sheath (Sheath) modified during complex spinning.

Conventionally, hollow yarns manufactured using composite spinning have good sacrificial properties and other physical properties, but it is difficult to control the proper dissolution rate for the desired hollow formation during the post-weaving process and it is difficult to form a uniform hollow due to the dissolution difference between monofilaments. there was.

In order to solve these disadvantages, a fiber-forming polyester modified by adding an organic sulfonic acid metal salt and titanium dioxide to the polymer of the sheath portion has been proposed, but in this case, it is difficult to dissolve during the elution process, or during polymerization and spinning. Due to poor dispersibility, the dissolution difference between each filament is severe during post processing dissolution.

In addition, there is a disadvantage in the addition of more than a certain amount because of the disadvantages such as poor sacrificial defects and guide wear when added.

Accordingly, the present invention solves the problems of the prior art, such as free hollow control without a separate device by modifying by adding inorganic fine particles to the sheath polymer of the conventional fiber-forming polymer used. .

Accordingly, it is an object of the present invention to provide a method for producing high hollow fiber excellent in dissolution properties.

Hereinafter, the present invention will be described in detail.

The present invention provides a composite fiber of a heterogeneous spun yarn in the form of a sheath-core and then elutes the polymer of the core portion to produce hollow fiber, either barium sulfate alone or a mixture of barium sulfate and phosphorus compounds. It is a manufacturing method of the high hollow fiber which uses the modified polymer which added this as a polymer for sheath.

The fiber-forming polymer used in the present invention is a polymer in which barium sulfate alone or a mixture of barium sulfate and phosphorus compound is added during polyester synthesis, and the amount of the fiber-forming polymer is preferably 5 to 13% by weight relative to terephthalic acid.

As the amount of inorganic fine particles was increased, the dissolution property tended to be good. However, when the amount of the inorganic fine particles is more than 13% by weight, the dispersibility is poor, and the dissolution is poor and the dissolution is uneven in post processing.

Referring to the drawings, the core polymer is injected into part (1) of FIG. 1 and the sheath polymer is injected into part (2) so that the sheath polymer wraps through the final nozzle while the sheath polymer surrounds the core polymer. A core cross section is formed and is sacrificed.

FIG. 2 shows that as the sheath portion 4 is reduced in the elution process, a valley is formed to communicate with the outside and the inside of the sheath, and a hollow is formed as the polymer of the core portion 3 exits through the valley.

3 is a core component polymer (6) and a cis component polymer (6), Figure 4 (a), (b) is a cross-sectional photograph after all the core component polymer exits, Figure 4 ( B) part (7) connects the inside and the outside, and the polymer of the core part comes out through the bone.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the Examples.

Example 1

The fiber-forming polymer, that is, the sheath polymer, was a polyester polymer having an addition amount of barium sulfate of 7% by weight relative to terephthalic acid, having an extreme viscosity of 0.598 to 0.613 at 350 ° C of orthochlorophenol, and was melt-compressed at 290 ° C. .

The discharge amount was 21g, the winding speed was 1,200m / min, the stretching ratio was 3.0, and after stretching, 100 denier filaments were prepared. At this time, the odd number of spinnerets was 36 holes. The core polymer is a modified polyester polymer having excellent dissolution properties. Skysol (manufactured by Sunkyung Industry Co., Ltd.) having an ultimate viscosity of 0.664 at 35 ° C. in orthochlorophenol was used. It carried out on the same conditions as a polymer.

After spinning, it was reduced for 60 minutes at 4% NaOH 98 ℃.

Example 2

Except that the amount of barium sulfate in the sheath polymer was changed to 13% by weight compared to terephthalic acid, and the discharge amount of the core polymer was changed to 21 g per two minutes, it was carried out in the same manner as in Example 1.

Example 3

Except for the addition of 7% by weight of barium sulfate and 3% by weight of phosphorus compound (Kenrich Co., Ltd. KR46B) to the polymer for the sheath was carried out in the same manner as in Example 1.

(Comparative Example 1)

It carried out similarly to Example 1 using the thing modified by adding 2 weight% of organic sulfonic acid metal salts and a titanium oxide as a polymer for sheath.

(Comparative Example 2)

It carried out similarly to Example 1 using the thing modified by adding 4 weight% of organic sulfonic acid metal salts and a titanium oxide as a sheath polymer.

Physical properties of the hollow yarns prepared in Examples and Comparative Examples are shown in Table 1 below.

Table 1

Property measurement method

Hollow ratio: The area ratio of the outer area of the sheath to the hollowed portion after hollow formation by the elution process.

Desabilization: Spinning and stretching processability, stability of pressure in spinning process, appearance of yarns that have been spun and stretched.

Absorption: After weaving the prepared yarn, wash it twice, make a sample piece with a certain length, and measure the distance absorbed for 30 minutes using the absorption distance measuring device.

Light weight: Take a certain amount of samples from the knitted yarn and measure the weight after dissolution in the dissolution process.

Elutionability: In the elution process, the elution was carried out under the same conditions (alkali concentration and treatment time), and the weight loss was compared.

Claims (1)

In the manufacturing of hollow fiber by dissolving heteropolymers in the form of Sheath-core and then eluting the polymer of the core part, barium sulfate alone or a mixture of barium sulfate and phosphorus compounds is compared to terephthalic acid. A method for producing a high hollow fiber having excellent dissolution property, using a modified polymer added 5 to 13% by weight as the polymer for the sheath.