KR100291600B1 - Manufacturing method of spontaneous high-strength composite hollow fiber - Google Patents

Abstract

In the present invention, two types of fiber-forming polymers are spun in a side-by-side form, but the difference in viscosity is 0.12 to 0.18, and the content of inorganic particles in the high viscosity portion must be greater than the content of inorganic particles in the low viscosity portion, and the inorganicity between the high and low viscosity polymers. By using two kinds of fiber-forming polymers with a particle content difference of 0.3 wt% to 2 wt%, composite hollow fibers having excellent crimping properties and hollowness can be produced with good spinning workability.

Description

Method for manufacturing spontaneous high crimp composite hollow fiber

The present invention is to increase the inorganic particle content of the high-viscosity polymer and to reduce the inorganic particle content of the low-viscosity polymer with low shrinkage, and to perform the composite spinning in the side-by-side form. The present invention relates to a method for producing spontaneous high crimp composite hollow fiber having bulkiness, warmth, light weight, and the like.

As a manufacturing method for imparting gloss, touch, bulkiness, hygroscopicity, and the like to natural fibers, a method of mixing low molecular weight polymers and high molecular weight polymers, bishrink intermixing, and release cross-section manufacturing methods are known. Di-shrink blended yarn is a method of incorporating two types of yarns with different heat shrinkage rates (Japanese Patent Laid-Open Nos. 55-57042 and 59-216934) and a method of complex spinning two types of polymers with different heat shrinkage rates (Japanese Patent Place) No. 51-67421 and U.S. Patent No. 3671379) and a method for producing a composite fiber expressing high crimping characteristics using copolymers having different properties as in-situ copolymers as first and second components (Japanese Patent Laid-Open) 51-116220) have been proposed. However, the composite fiber made of biaxially blended yarn has disadvantages of uneven crimp expression and lack of crimp durability, and the composite spinning method composed of two kinds of polymers has low compatibility between the polymers, resulting in poor adhesion at the interface. There are various problems such as easy separation of the interface of the cationic component by external force after spinning.

The crimped composite fiber produced by using the in-situ copolymer using the characteristic difference of the two components has excellent compatibility between the positive parts, so it has excellent adhesion and crimp characteristics at the interface and relatively excellent expression of the crimp characteristics. Because of this, the crimped composite fiber produced using this method has problems in the weaving process, such as low crimp modulus and crimp stability. In addition, when the hollow fiber having a hollow in the cross-section to improve the bulkiness and lightness, if only the viscosity difference of the raw material is increased to improve the crimp characteristics of the fiber, it is not possible to obtain a uniform and improved product due to the decrease in the hollow ratio and the workability. In addition, if the hollowness is increased in order to improve the bulkiness, the hollow acts inversely to form a crimp, so the hollow characteristic has a problem in that the crimp characteristic is lowered.

The present invention solves the problems as described above, and has a technical problem to provide a method for producing spontaneous crimped composite hollow fiber having a high hollowness and uniformity, excellent crimping properties and at the same time excellent spinning workability.

1 is a cross-sectional view of a composite fiber spun using only the conventional inherent viscosity difference.

Figure 2 is a cross-sectional view of the composite hollow fiber according to the present invention.

<Explanation of Signs of Major Parts of Drawings>

1: high viscosity polymer part in hollow fiber, 2: low viscosity polymer part in hollow fiber,

1 ': polymer part having high viscosity and high inorganic particle content in hollow fiber,

2 ′: Polymer part having low viscosity and low inorganic particle content in hollow fiber,

In the present invention, when the inorganic particles are added to the same raw material, the orientation and crystallinity of the raw material are increased, and accordingly, the force to shrink when the stress is removed after stretching is increased. A large amount is added, and the low viscosity part is characterized by reducing the content of inorganic particles to double the difference in physical properties of the two components.

The present invention is described in more detail as follows.

The two fiber-forming polymers used in the present invention have mutual affinity and the shrinkage of one component of both polymers is larger than the other component.

In order to provide the high viscosity part and the low viscosity part with appropriate hollowness and crimping property, the viscosity difference between the two components is preferably 0.12 to 0.18, and more preferably 0.14 to 0.16. When the viscosity difference between the two components is less than 0.12, the hollowness of the cross section is large, but the difference in shrinkage characteristics expressed by the intrinsic viscosity difference is small and the crimp is hardly formed by the hollow.

In addition, if the viscosity difference between the two components is greater than 0.18, it causes trimming due to the occurrence of curvature.

The inorganic particle content of the high viscosity part should be larger than the inorganic particle content of the low viscosity part, and the inorganic particle content difference is preferably 0.3% by weight to 2% by weight, and the inorganic particle content of the high viscosity part is preferably 2% by weight or less. If the difference in content of inorganic particles in the high and low viscosity portions is less than 0.3% by weight, the difference between the orientation and crystallinity of the two components with and without the inorganic particles is not large enough to double the crimp characteristics due to the intrinsic viscosity difference, and the inorganic particles in the high viscosity portion If the content is greater than 2% by weight, the inorganic particles act as foreign matter in the pack during spinning to increase the pressure in the pack, thereby reducing the spinning stability such as unevenness of fineness and poor workability.

1 is a cross-sectional view of a composite hollow fiber manufactured using only the existing inherent viscosity difference, and the hollow part is eccentric to the high viscosity part 1 region due to the spreading phenomenon of the low viscosity part 2, so that the hollowness is low. In this case, when the viscosity difference between the two polymers is increased to improve the crimping property, the eccentricity to the high viscosity part becomes larger, resulting in a more severe decrease in the hollow rate. FIG. 2 is a cross-sectional view of the fiber when the yarn is spun by using the manufacturing method of the present invention, that is, the difference in content of inorganic particles, and shows a low degree of eccentricity due to the spreading of the low viscosity part 2 'and high hollowness. It is showing.

Examples 1-2

The viscosity of the high viscosity polyester component (1 ') and the low viscosity polyester component (2') and the inorganic particle (TiO ₂ ) content are shown in Table 1, and the content ratio of (1 ') and (2') is 50:50. Compound spinning was performed in a side-by-side type, but undrawn yarn of 240 denier 24 filaments was obtained at a winding speed of 1000 m / min at a spinning temperature of 280 ° C. This undrawn yarn was wound at a draw temperature of 70 ° C. for the first roller, a draw temperature of 210 ° C. for the second roller, and a draw ratio of 3.9 to obtain spontaneous winding yarn.

Comparative Examples 1 to 4

Except having changed intrinsic viscosity and inorganic particle content of (1 ') component and (2') component on the conditions of Table 1, it manufactured by the method similar to Examples 1-2, and evaluated the physical property, and is shown in Table 1. .

division Intrinsic viscosity (dℓ / g) (high viscosity / low viscosity part) Inorganic particle content (%) (high viscosity part / low viscosity part) Hollow rate (%) Crystallinity (%) (high viscosity part / low viscosity part) Birefringence of high-strength yarn (high viscosity part / low viscosity part) Crimp Number (pcs / inch) Radiation workability Example 1 0.65 / 0.53 0.4 / 0 18 31.5 / 25.5 0.172 / 0.11 21 Great Example 2 0.65 / 0.47 0.5 / 0.2 12 31.5 / 23.0 0.172 / 0.12 18 Great Comparative Example 1 0.65 / 0.53 0/0 19 28.5 / 26 0.15 / 0.125 9 Great Comparative Example 2 0.65 / 0.55 0.4 / 0 22 31.5 / 26 0.167 / 0.13 6 usually Comparative Example 3 0.65 / 0.47 0/0 11 28.5 / 21 0.15 / 0.08 7 usually Comparative Example 4 0.65 / 0.43 2.2 / 0.3 5 31.5 / 22.5 0.172 / 0.10 13 Bad

※ Hollow rate (%) = (area of hollow formation part) / (total area of fiber section) × 100

※ Number of crimps: The number of crimp repeat units that are present within 1 inch in tension.

※ Crystallization degree (%): Measured using density gradient pipe method

※ birefringence: measured using polarizing microscope

※ Radiation workability: It is excellent if there is no trimming by measuring the number of trimmings per hour.

1 ~ 2 times, usually 3 times or more

The composite hollow fiber produced by the present invention is excellent in bulkiness and feel due to the maximization of crimping properties, and excellent in heat retention and lightness by the formation of high hollowness. In addition, the present invention can produce a composite hollow fiber of the above characteristics with good spinning workability.

Claims (2)

Two kinds of polyester polymers with different shrinkage characteristics are spun in a side by side form, but the inherent viscosity difference between the high viscosity polymer and the low viscosity polymer is 0.12 to 0.18, and the inorganic particle content of the high viscosity polymer is low. Fig. 2 is a method for producing spontaneous high crimped composite hollow fiber, characterized in that two kinds of polyester polymers are used which are larger than the inorganic particle content of the polymer and the difference is 0.3% by weight to 2% by weight. The method for producing spontaneous high crimped composite hollow fiber according to claim 1, wherein the content of inorganic particles in the high viscosity polymer is 2% by weight or less.