KR101946473B1 - Complex Hollow Fiber Having Improved Bulky Property and fibrous assemblies using thereof - Google Patents

Abstract

The present invention relates to a high viscosity polyester (a) having an intrinsic viscosity of 0.64 to 0.90 and a low viscosity polyester (b) having an intrinsic viscosity of 0.40 to 0.68 containing pyromellitic dianhydride (PMDA) And a hollow composite fiber formed by a bicomponent structure and having improved bulky properties.

Description

TECHNICAL FIELD [0001] The present invention relates to a hollow composite fiber having improved bulkiness and a fibrous aggregate using the composite fiber.

The present invention relates to a hollow composite fiber having improved bulkiness and a fiber aggregate using the same, and more particularly, to a hollow composite fiber improved in bulkiness and formability by utilizing a multifunctional component and a fiber aggregate using the composite fiber.

As outdoor clothing becomes popular, when outdoor winds are blowing, everyone can take out the goose down or duck down jumper to maintain the body temperature. Outdoor products are already in the deep part of our life. , Consumers have begun to demand outdoor products that are more suitable for everyday life than high-priced, warm-keeping high-end products for extreme environments.

As a result of these trends, winter outdoor products are being developed for outdoor products that are thin, lightweight, lightweight, windproof, breathable and highly functional outdoor products, and their popularity is increasing day by day.

Unlike outdoor or casual wear, which has a recent characteristic that use of artificial fillers will increase, men's wear with coat-style down products is wool on the outer and duck or goose, Artificial fillers are preferred because they are easy to come out, and they are much more expensive than natural fillers with cost hikes. However, a substitute material that can satisfy the warmth and lightweight effect of a feather used as a filler for endothelium is not sufficiently developed.

Most of the cold weather products currently on the market are heat insulation by the air layer, which causes the activity to be lowered as a reason to increase the thickness of the fabric constituting the covering, and the feathers (feather, Is deteriorated due to agglomeration and exudation during washing and it is not good for cosmetics. In addition, the form of pulling feathers from ducks and goosebumps is causing discomfort in animal protection groups. Due to the nature of natural materials, there is a concern that odor is generated, and there are many inconveniences in terms of management such as washing.

Accordingly, in order to satisfy consumer needs of various classes, it is required to develop a general-purpose outdoor product having superior functionality and cost competitiveness, and domestic materials for it.

Korean Patent No. 1183949 discloses a padding for warming which is formed by laminating synthetic fibers and mammalian hairs together. The padding made a multi-layered insulating material made by laminating a synthetic fiber layer, a layer of a mixture of a mammalian hair and a synthetic fiber, and made a formally stable insulating material having a proper thickness without aggregation or fiber exudation. However, The process is troublesome because a separate facility for supplying mammal hair is added, and the merit of the mammal hair is mixed with the synthetic fiber to reduce the merit of the moth, and the price competitiveness is lower than that of a general synthetic thermal insulator.

In addition, Korean Patent No. 1414206 discloses a C-type hollow fiber which has an improved hollow ratio to maximize the effects such as heat insulation and light weight, but it is inconvenient to carry out a post- (IV), and there is no curl property.

In addition, general synthetic fillers are produced in a uniform form by laminating short fibers, and when they are used in clothes such as padding, clustering may occur, and the recoverability is deteriorated when they are used for a long time.

Disclosure of the Invention The present invention has been made to solve the above-mentioned problems. It is an object of the present invention to provide a hollow composite fiber formed by using a high viscosity, low viscosity polyester, which contains a polyfunctional component in a high viscosity polyester, To thereby provide a hollow composite fiber having improved crimpability and improved bulky property and elasticity.

In addition, the hollow composite fiber of the present invention is excellent in heat retention due to its excellent baling property and high permeability, and is intended to provide a fiber aggregate which can be used as a filler suitable for clothing or bedding.

The present invention relates to a high viscosity polyester (a) having an intrinsic viscosity of 0.64 to 0.90 and a low viscosity polyester (b) having an intrinsic viscosity of 0.40 to 0.68 containing pyromellitic dianhydride (PMDA) Wherein the hollow composite fibers are formed of a bicomponent structure.

Further, the difference (IVa-IVb) between the intrinsic viscosity (IVa) of the high viscosity polyester and the intrinsic viscosity (IVb) of the low viscosity polyester satisfies the following formula (1) .

0.05? (IVa-IVb)? 0.26 (1)

The present invention also provides a hollow composite fiber having improved bulky property, wherein the pyromellitic dianhydride (PMDA) is contained in an amount of 10 to 5,000 ppm based on the high-viscosity polyester.

Also, the present invention provides a hollow composite fiber having improved hollow fiber properties, wherein the hollow fiber composite has a hollow ratio of 10 to 35%.

The present invention also provides a fibrous aggregate comprising the above hollow composite fibers.

The hollow composite fiber according to the present invention has improved bulkiness and morphological stability due to pyromellitic dianhydride (PMDA) contained in the high viscosity polyester.

In addition, the embossing property and the hollow effect provide a high embedding rate and an excellent elasticity, thereby improving the thermal insulation.

In addition, it has an effect of providing a fibrous aggregate which can be used as a filler suitable for clothing or bedding with excellent warmth.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional photograph of a hollow composite fiber according to an embodiment of the present invention. FIG.
Fig. 2 is a cross-sectional photograph of hollow composite fibers of Comparative Examples. Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that, in the drawings, the same components or parts have the same reference numerals as much as possible. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as to avoid obscuring the subject matter of the present invention.

As used herein, the terms " about, " " substantially, " " etc. ", when used to refer to a manufacturing or material tolerance inherent in the stated sense, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

The present invention relates to a high viscosity polyester (a) having an intrinsic viscosity of 0.64 to 0.90 and a low viscosity polyester (a) having an intrinsic viscosity of 0.40 to 0.68 containing pyromellitic dianhydride (PMDA) b) is formed into a hollow side by side structure.

The above-mentioned pyromellitic dianhydride (PMDA) is added to the polyester and is contained as a polyfunctional component, which acts as a chain extender when blended with a polyester resin, and thus is superior to a conventional polyester resin in which a polyfunctional component is not added Which can easily obtain a polyester having a high melt viscosity at the same intrinsic viscosity, and has an effect of improving the bulky property due to an increase in molecular weight due to intramolecular chain extension.

The content of the pyromellitic dianhydride (PMDA) is preferably 10 to 5,000 ppm when blended with the high viscosity polyester resin. When the content is less than 10 ppm, the content of the pyromellitic dianhydride (PMDA) is insufficient to serve as a desired chain extender. On the contrary, if the viscosity increases suddenly, it may cause problems in spinning and stretching.

The above-mentioned pyromellitic dianhydride (PMDA) is preferably contained in an amount of 500 ppm or more for improving the bulky property, and it is most preferable that the PMDA is contained in an amount of 500 to 3,000 ppm based on the high-viscosity polyester.

In order to improve the bulky property by using the high viscosity polyester (a) and the low viscosity polyester, the difference between the intrinsic viscosity (IVa) of the high viscosity polyester and the intrinsic viscosity (IVb) -IVb) satisfies the following formula (1).

0.05? (IVa-IVb)? 0.26 (1)

If the intrinsic viscosity difference (IVa-IVb) between the high viscosity polyester (a) and the low viscosity polyester is less than 0.05, the crimp development of the crimp may be insufficient and the intrinsic viscosity difference (IVa-IVb) The viscosity difference between the two kinds of polyesters is excessively large, so that there arises a problem that the spinning workability due to the occurrence of the drawing becomes extremely poor due to an increase in the difference in linear velocity in spinning spinning during spinning.

When the viscosity of the high viscosity polyester (a) to which the multifunctional component is added during spinning is too high, it is difficult to produce the polyester in a commercial production, Causing problems. Therefore, the viscosity of the high viscosity polyester to which the polyfunctional component is added is preferably 0.64 to 0.88. Accordingly, the viscosity of ordinary low-viscosity polyesters can be adjusted by adjusting the intrinsic viscosity differences (IVa-IVb) of the two kinds of polyesters to the above-described conditions.

The hollow composite fibers of the present invention may preferably have a hollow ratio of 10 to 35% in order to increase the insulation ratio and increase the warmth.

The hollow composite fiber according to the present invention having improved bulking properties according to the present invention has a high crimping ratio and excellent bulging property and a high hollow fiber content and a high insulation rate to provide a fiber aggregate such as a garment or a bedding filler It will be appropriate.

The fibrous aggregate may be in the form of a web or a ball-like filler, or may be in the form of a fabric produced in the form of filaments or yarns and formed into weaving or knitting.

Hereinafter, examples of hollow composite fibers having improved bulky properties according to the present invention will be shown, but the present invention is not limited to these examples.

Example  One

A high viscosity polyester with an intrinsic viscosity of 0.60 with 300 ppm of pyromellitic dianhydride (PMDA), a polyfunctional group, and a polyester with an intrinsic viscosity of 0.45 without pyromellitic dianhydride (PMDA) Thereby producing hollow composite fibers having improved bulky properties according to the present invention.

The spinning was carried out at a spinning temperature of 290 DEG C at a spinning speed of 1,000 m / min and stretched at a stretching ratio of 3.2 and crimped through a crimper to produce a fiber having a fiber length of 7De and a fiber length of 64 mm. The cross-section of the hollow composite fiber prepared above was photographed and shown in Fig. 1 (a).

Example  2

The polyester having the intrinsic viscosity of 0.64 and the polyester having the intrinsic viscosity of 0.45 were used as the high viscosity polyester, and the polyester having the intrinsic viscosity of 0.64, To prepare composite fibers. FIG. 1 (b) is a cross-sectional view of the hollow composite fiber prepared above.

Example  3

The polyester having the intrinsic viscosity of 0.74 in which 1,000 ppm of pyromellitic dianhydride (PMDA) was added and the polyester having an intrinsic viscosity of 0.60 was used in the high viscosity polyester, and the polyester having an intrinsic viscosity of 0.60 was used in the low viscosity polyester. Hollow composite fibers were prepared. FIG. 1 (c) is a cross-sectional view of the hollow composite fiber prepared above.

Example  4

The polyester having the intrinsic viscosity of 0.83, in which 2,000 ppm of pyromellitic dianhydride (PMDA) was added, was used as the high viscosity polyester, and the polyester having the intrinsic viscosity of 0.60 was used as the low viscosity polyester. Hollow composite fibers were prepared. FIG. 1 (d) is a cross-sectional view of the hollow composite fiber prepared above.

Example  5

Polyester having an intrinsic viscosity of 0.90 in which 3,000 ppm of pyromellitic dianhydride (PMDA) was added and polyester having an intrinsic viscosity of 0.68 in a low viscosity polyester was used as the high viscosity polyester. Hollow composite fibers were prepared. The cross-section of the hollow composite fiber prepared above was photographed and shown in Fig. 1 (e).

Example  6

The polyester having the intrinsic viscosity of 0.93, in which 3,500 ppm of pyromellitic dianhydride (PMDA) was added, was used as the high viscosity polyester, and the polyester having the intrinsic viscosity of 0.68 was used as the low viscosity polyester. Hollow composite fibers were prepared. FIG. 1 (f) is a cross-sectional view of the hollow composite fiber prepared above.

Comparative Example  One

Polyester fibers with an intrinsic viscosity of 0.64 and an intrinsic viscosity of 0.45 were co-spun to produce fibers. After spinning at a spinning temperature of 290 ° C at a spinning speed of 1,000 m / min, stretching was carried out at a stretching ratio of 3.2, crimped through a crimper, and fibers having a fiber length of 7 Da and a fiber length of 64 mm were produced. FIG. 2 (a) is a cross-sectional view of the hollow composite fiber prepared above.

Comparative Example  2

Polyester conjugate having an intrinsic viscosity of 0.75 was used as the high viscosity polyester, and polyester having the intrinsic viscosity of 0.64 as the low viscosity polyester was used to prepare the hollow conjugated fiber. FIG. 2 (b) is a cross-sectional view of the hollow composite fiber prepared above.

Comparative Example  3

Polyester having an intrinsic viscosity of 0.80 was used for the high viscosity polyester, and polyester having the intrinsic viscosity of 0.60 for the low viscosity polyester was used to prepare the hollow conjugated fiber. FIG. 2 (c) is a cross-sectional view of the hollow composite fiber prepared above.

◈ Evaluation of physical properties of examples and comparative examples

The properties of the hollow composite fibers prepared in Examples 1 to 4 and Comparative Examples 1 to 3 were evaluated and are shown in Table 1. The physical properties were measured as follows.

Intrinsic Viscosity (IV): Copolymer polyester was dissolved in phenol / tetrachloroethane (weight ratio 50/50) to make a 0.5 wt% solution, and the viscosity was measured at 35 캜 by a Uvold viscometer.

Melt viscosity (MV): The polyester sample was measured at 290 DEG C with a shear rate of 100 rad / sec on a flat panel oil-based system.

◎ Bulkability of composite fibers

end. Test Methods

- Quantify 20.2g of the prepared sample.

- The sample is opened for one minute using the carding mechanism.

- Insert the opened sample into a measuring beaker and let it go down 2 times (4cm) until it is uniformly filled.

- Set the electronic balance to 0 "after placing the pressure plate on top of the container.

- Record the weight of the scale while descending 1cm increments from the first 10cm to the 4cm point.

- Go back to 10 cm and record the weight.

 (Graduation speed 2 sec / cm)

I. Bulkite

- Initial bulky: Bulk properties of fibers, value at 10 cm compression

- Compression bullet: the rebound characteristics of the fiber, (compression 10 ~ 5cm value + 4cm value) / 2

- Recovery Bulk: elastic recovery properties of fiber (recovery 10 ~ 5cm value + 4cm value) / 2

◎ Hollow ratio

The hollow ratio of the fibers was calculated as the ratio of the area occupied by the hollow to the total area of the fibers. The hollow fiber with the volume control was measured as the ratio of the area occupied by the hollow relative to the area of the contact with the pinion.

division Example 1 Example 2 Example 3 Example 4 Example
5 Example
6 Comparative Example 1 Comparative Example 2 Comparative Example 3 High viscosity PET Intrinsic viscosity
(dl / g) 0.60 0.64 0.74 0.83 0.90 0.93 0.64 0.75 0.80 additive
(ppm) PMDA
(300) PMDA
(500) PMDA
(1,000) PMDA
(2,000) PMDA
(3,000) PMDA
(3,500) - - - Low viscosity PET Intrinsic viscosity
(dl / g) 0.45 0.45 0.60 0.60 0.68 0.68 0.45 0.64 0.60 Properties Compression bulletproof 10,058 11,584 14,857 15,845 16,534 16,623 9,454 9,854 10,241 Hollowness (%) 15 18 33 27 25 23 5 7 9 fair Radioactive Good Good Good Good Good Bad Good Good Good

As shown in Table 1, the hollow composite fibers prepared in Examples 2 to 5 had an average compression bulging property of about 14,705, and the hollow composite fibers prepared in Comparative Examples 1 to 3 had an average compression bulging property of about 9,850 . That is, the fibers according to the present invention have improved bulky properties due to the increase in molecular weight due to intramolecular chain extension when polyfunctional group pyromellitic dianhydride (PMDA) is added.

In the case of the hollow conjugated fiber prepared in Example 1, 300 ppm of pyromellitic dianhydride (PMDA) was contained and the compression bulging property was about 10,000, and compared with the hollow conjugated fiber using only the high viscosity polyester without the multifunctional group prepared in Comparative Example 3 Similar compressive buckiness was observed. That is, it can be confirmed that when the content of pyromellitic dianhydride (PMDA) is 500 ppm or more, it has better compression-bulging property than a general polyester having no polyfunctional group.

In addition, when the content of pyromellitic dianhydride (PMDA) was 1,000 ppm or more, the compression bulging property was improved to about 15,000, and the compression bulging property was improved as compared with Comparative Examples 2 and 3 in which only the high viscosity polyester was used without polyfunctional functional groups. It is more preferable that the dianhydride (PMDA) is contained in 1,000 ppm or more.

The hollow composite fiber prepared in Example 6 contained 3,500 ppm of pyromellitic dianhydride (PMDA), and the difference in viscosity between the high viscosity polyester and the low viscosity polyester was too large to increase the linear velocity difference in spinning spinning It has been found that the radiation workability due to the occurrence of the scratches becomes poor, and the problem of the increase of the radiation package pressure and the load of the gear pump is caused.

Therefore, an appropriate content of pyromellitic dianhydride (PMDA) in the high viscosity polyester of the present invention is preferably 500 to 3,000 ppm.

Claims (5)

Viscosity polyester (a) having an intrinsic viscosity of 0.64 to 0.90 and pyromellitic dianhydride (PMDA) as a multifunctional component and a low viscosity polyester (b) having an intrinsic viscosity of 0.40 to 0.68 as a hollow side- Lt; / RTI >
Wherein the pyromellitic dianhydride (PMDA) is contained in an amount of 500 to 3,000 ppm based on the high-viscosity polyester, and the hollow ratio is 18 to 33%. The method according to claim 1,
Characterized in that the difference (IVa-IVb) between the intrinsic viscosity (IVa) of the high viscosity polyester and the intrinsic viscosity (IVb) of the low viscosity polyester satisfies the following formula (1).
0.05? (IVa-IVb)? 0.26 (1) delete delete A fibrous aggregate comprising the hollow conjugated fibers of claim 1 or 2.

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