KR101712844B1 - Shaped cross-section hollow fiber and fibrous Assemblies using thereof for high heat-resistance - Google Patents

Abstract

The present invention relates to a modified hollow fiber, wherein the fiber is used as polycyclohexylene dimethylene terephthalate, the fiber comprising a hollow portion, a shape retaining portion, and a volume control portion, And the end portion may be in the form of a round shape.

Description

TECHNICAL FIELD [0001] The present invention relates to a hollow fiber having a high heat resistance and a fiber aggregate using the hollow fiber,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hollow fiber having a uniform cross section and a fiber aggregate using the hollow fiber.

In general, fibers used for fiber aggregates requiring high functionality such as high heat resistance and sound absorbing properties are mostly made of PU foam, glass fiber, resin-felt, etc. having high heat resistance Are manufactured by the following representative methods.

Among these techniques, Korean Patent Laid-Open No. 2001-109937 discloses a method of immersing an E-glass fiber in an aqueous hydrochloric acid solution to improve the heat resistance of E-glass fiber to form an oxide boran (B2O3), magnesium oxide (MgO) Is dissolved and removed by extraction, and a sound absorbing agent using the E-glass fiber is described.

This can improve the heat resistance of the E-glass fiber used as a sound absorbing material, but the glass fiber is heavy in weight and difficult to be processed, and glass fiber has a disadvantage that it is less sound-absorbing than organic fiber.

Another method is to use a nonwoven fabric having a high heat resistance and a nonwoven fabric having a high sound absorbing property. A nonwoven fabric containing inorganic fibers having high heat resistance was placed in the upper part and a nonwoven fabric containing organic fibers favorable for sound absorption was placed in the middle part and laminated by heat fusion.

Among these techniques, Korean Patent Registration No. 1499812 of Korea in 2015 discloses a base layer forming step of forming a base layer by impregnating an inorganic fiber nonwoven fabric with a thermosetting binder, a skin layer forming step of forming a skin layer by impregnating the superfine nonwoven fabric into a thermosetting binder, A lamination step of laminating the skin layer on the upper and lower surfaces of the substrate layer, and a molding step of molding the laminate manufactured through the lamination step are described.

It is possible to produce a product having high heat resistance and favorable sound absorption, but still uses inorganic fibers and has a drawback in that durability is deteriorated by using a binder for laminating nonwoven fabrics with inorganic fibers and organic fibers.

Therefore, complex functional fibers and fiber aggregates having high heat resistance and sound absorption properties have been earnestly requested.

In order to solve the above problems, it is an object of the present invention to provide a fiber capable of manifesting various functions by securing a space between fibers by securing an element for controlling volume in the fiber aggregate while securing the morphology of the hollow portion stably. .

Another object of the present invention is to provide a high heat resistant fiber.

Another object of the present invention is to provide fibers and fiber aggregates having sound-absorbing properties.

Another object of the present invention is to provide a fiber capable of manifesting various functions through spontaneous crimp expression.

In order to achieve the above object, the present invention provides a modified hollow fiber, wherein the fiber is used as a polycyclohexylene dimethylene terephthalate (PCT) resin, and the fiber comprises a hollow portion, And a volume control unit, wherein the volume control unit may protrude in a direction opposite to the center of the fiber, and the distal end may have a round shape.

The present invention also provides a modified hollow fiber having the following characteristics when the uppermost portion of the volume control portion is defined as a peak and the volume control portion is defined as a valley.

 (1) -3? Z? 4

≤ 1.8(2) 0.9?

1.8

here,

R: radius of curvature of peak

r: radius of curvature of the valley

The present invention also provides a modified hollow fiber having the following properties.

≥ 0.80(3)

≥ 0.80

≥ 0.30(4)

≥ 0.30

here,

T1: the distance from the center point M to the peak 310 is the largest value

T2: the distance from the center point M to the peak 310 is the smallest value

t1: the distance from the center point M to the valley 330 is the largest value

t2: the distance from the center point M to the valley 330 is the smallest value

CTmax: the distance from the center point M to the peak 310 on the basis of T1 is a circle formed by connecting the tangent of the volume controller 300 having the next higher order value,

CTmin: T2 is a circle formed by connecting the tangent of the volume control unit 300 having a smaller distance from the center point M to the peak 310,

Ctmax: A circle formed by connecting the tangent of the volume control unit 300 having the next higher order distance from the center point M to the peak 310 with reference to t1

Ctmin: a circle formed by connecting the tangent of the volume control unit 300 having a smaller distance from the center point M to the peak 310,

CTmax-R: Difference value between the center point (CTmaxM) and the center point (M) of CTmax

CTmin-R: Difference value between the center point CTminM of the CTmin and the center point M

Ctmax-r: Difference value between the center point (CtmaxM) and the center point (M) of Ctmax

Ctmin-r: Difference value between the center point (CtminM) and the center point (M) of Ctmin

Also, the present invention provides a modified hollow fiber having 4 to 12 volume control portions.

In addition, the present invention provides a modified cross-section hollow fiber in which the hollow portion is formed at 15 to 30% in cross-sectional area of the fiber.

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

The modified hollow fiber according to an embodiment of the present invention can provide a fiber having a relatively high hollow ratio and a stable shape.

The present invention can also provide high heat resistant fibers using polycyclohexylene dimethylene terephthalate.

In addition, the present invention has an advantage of securing the bulky property in the fiber aggregate due to the interference effect of the volume control part, thereby securing more dead air and exhibiting a high sound absorption characteristic.

In addition, the present invention is advantageous in that the hollow portion and the spontaneous crimp structure are excellent in light weight and heat retention as well as bulging property and elasticity.

1 to 6 are schematic views of a fiber cross section according to a preferred embodiment of the present invention.
7 is a conceptual view of spinning and detaching corresponding to a volume control unit according to a preferred embodiment of the present invention.
8 is a schematic cross-sectional view of a fiber assembly according to a preferred embodiment of the present invention.
9 is a conceptual view of spinning and detaching according to the prior art.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, 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 "substantially", "substantially", and the like are used herein to refer to a value in or near the numerical value when presenting manufacturing and material tolerances inherent in the meanings mentioned, Absolute numbers are used to prevent unauthorized exploitation by unauthorized intruders of the mentioned disclosure.

As used herein, the term fibrous aggregate refers to a group including at least one kind of fibers such as a fabric, a knitted fabric, a fabric, a nonwoven fabric, a web, a sliver, a tow, and the like.

 According to a preferred embodiment of the present invention, the modified hollow fiber may be made of polycyclohexylene dimethylene terephthalate (PCT), and may be produced by spontaneous crimp development due to the difference in crystallization rate during cooling and solidification, It can contribute to improving the bulging property and the sound absorbing property in the state or nonwoven fabric form.

Polycyclohexylene dimethylene terephthalate (PCT) is polyester based, and its crystallization speed is much faster than that of PET and injection molding is possible. In addition, it has a low water absorption rate compared to the PA-based polymer and is excellent in discoloration resistance by heat.

In case of fiber using PCT, it can withstand high temperatures up to 260 ℃. It is easy to use as a sound absorbing material because it has less change in performance even in long term use in harsh thermal environment and excellent noise reduction ability compared to PU foam or glass fiber product.

The polymerization reaction of PCT is the same as the following reaction scheme.

FIG. 1 is a conceptual view of a modified hollow fiber according to a preferred embodiment of the present invention. The fiber 10 may be formed of a hollow part 100, a shape retaining part 200, and a volume control part 300. It is preferable that the hollow portion 100 has a hollow ratio of about 15 to 30% in the total area of the fibers. Above the above range, there may be a problem in fiber formability, and if it is less than the above range, the hollow retention property and the various functionalities of the present invention may be limited. The shape retaining part 200 refers to a fibrous shape between the hollow part 100 and the volume control part 300.

The volume control part 300 may protrude in a direction opposite to the center of the fiber, and the distal end may be round. At this time, the uppermost part of the distal end can be defined as the peak 310, and the space between the volume control parts can be defined as the valley 330. At this time, the radius of curvature of the peak may be defined as R, the radius of curvature of the valley may be defined as r, and R and r values that are different from each other may be determined for each volume controller (FIG. 2).

A value T1 is the largest distance from the center point M of the hollow portion 100 to the peak 310 and T2 the smallest distance from the center point M to the peak 310 is the center point M And the distance from the center point M to the valley 330 is defined as t2. On the other hand, a circle formed by connecting the tangent of the volume controller 300 having the next higher order distance from the center point M to the peak 310 on the basis of T1 is referred to as CTmax and T2 is defined as a peak from the center point M A circle formed by connecting the tangent of the volume controller 300 having a smaller distance from the center point M to the peak 310 is referred to as a CTmin and a distance from the center point M to the peak 310 on the basis of t1 is larger And a tangent line of the volume control unit 300 having a smaller distance from the center point M to the peak 310 is connected to the tangent line of the volume control unit 300 When the formed circle is Ctmin; The difference value between the center point CTmaxM of the CTmax and the center point M is denoted by CTmax-R and the difference between the center point CTminM of the CTmin and the center point M is denoted by CTmin-R and the center point CtmaxM of the Ctmax, When the difference value between the center point (CtminM) and the center point (M) of the Ctmin is defined as Ctmin-r, the fiber according to the present invention can satisfy the following conditions. 3 to 6)

When the deviation between the curvature radius R of the peak and the curvature radius r of the valley is defined as Z, the above Z may be defined by the following conditions (1) and (2).

(1) -3? Z? 4

≤ 1.8(2) 0.9?

1.8

here,

R: radius of curvature of peak

r: radius of curvature of the valley

Many tests by the present inventors through fiber cross-sectional morphology analysis showed that the volume control portion of one fiber was inserted into the valley between the volume control portions of the adjacent fibers in the outside of the above range to show a structural characteristic as if the gears were engaged, And it is analyzed that it has a bad influence on the uniformity of the fiber aggregate. The volume control part between the fibers interferes with each other within the above range, and the bulky property is maintained. Even if the volume control part is inserted into the valley of the adjacent fiber, the fiber control part can be easily detached by flow or the like, thereby improving uniformity in the fiber aggregate.

The fibers according to the preferred embodiment of the present invention may satisfy the following conditions: CTmax-R, CTmin-R, Ctmax-r, and Ctmin-r.

≥ 0.8(3)

≥ 0.8

≥ 0.30(4)

≥ 0.30

here,

T1: the distance from the center point M to the peak 310 is the largest value

T2: the distance from the center point M to the peak 310 is the smallest value

t1: the distance from the center point M to the valley 330 is the largest value

t2: the distance from the center point M to the valley 330 is the smallest value

CTmax: the distance from the center point M to the peak 310 on the basis of T1 is a circle formed by connecting the tangent of the volume controller 300 having the next higher order value,

CTmin: T2 is a circle formed by connecting the tangent of the volume control unit 300 having a smaller distance from the center point M to the peak 310,

Ctmax: A circle formed by connecting the tangent of the volume control unit 300 having the next higher order distance from the center point M to the peak 310 with reference to t1

Ctmin: a circle formed by connecting the tangent of the volume control unit 300 having a smaller distance from the center point M to the peak 310,

CTmax-R: Difference value between the center point (CTmaxM) and the center point (M) of CTmax

CTmin-R: Difference value between the center point CTminM of the CTmin and the center point M

Ctmax-r: Difference value between the center point (CtmaxM) and the center point (M) of Ctmax

Ctmin-r: Difference value between the center point (CtminM) and the center point (M) of Ctmin

The above conditions (3) and (4) may relate to the formation of fibers according to an embodiment of the present invention. Ideally, the value should be 1, but not 1 due to the rheological properties of the polymer. The condition (3) may be related to formation of the volume control portion. Outside of the above range, the deviation of the volume control portion may be large and the variation of the r value may be large, which may affect the carding property in the process or the bulkiness in the fiber aggregate. Condition (4) can be interpreted as fiber morphology, which can affect the formability of hollow portion 100 and shape retaining portion 200. Outside of the above range, hollow formation and fiber shape retention may be unstable.

In order to form the fiber cross-section as described above, the spinneret of the volume controller 300 may be formed in a radial shape as shown in FIG. At this time, an angle (?) Of 10 to 17 degrees with respect to the center point M may be formed. As a result of a number of tests by the present inventors, a fiber cross-sectional shape has been realized which can satisfy the above requirements for manifesting the function of the member 300 as a volume control element of the modified cross section while maintaining the hollowness within the above range.

 The cross-sectional shape of the modified hollow fiber used in the present invention may be 4 to 12 volume control parts on the fiber surface.

In addition, the fibers according to one embodiment of the present invention are non-limiting examples of which can contribute to improvement in baldness and sound absorption in the form of short fiber or nonwoven fabric through spontaneous crimp development due to a difference in crystallization speed in cooling and solidification processes.

The fiber according to the present invention can be produced by forming a fibrous assembly including a binding material for forming a binding structure between fibers or only the fibers according to the present invention into a nonwoven fabric through a needle punching process, a heat bonding process, or a meltblowing process have.

Hereinafter, this embodiment will be described.

Example 1

Polycyclohexylenedimethylene terephthalate (PCT) resin was used to prepare fibers having six volume control members. A fiber having a single fiber fineness of 6 Da and a fiber length of 64 mm was produced. Using this fiber, an amorphous polyester low melting point yarn was mixed in an amount of 30% by weight, and a nonwoven fabric was produced by needle punching. The nonwoven fabric had a thickness of 5 mm and a weight of about 800 g.

Example 2

Polycyclohexylenedimethylene terephthalate (PCT) resin was used to prepare fibers having six volume control members. A fiber having a single fiber fineness of 6 Da and a fiber length of 64 mm was produced. Using this fiber, a semi-crystalline polyester low melting point yarn was mixed in an amount of 30% by weight, and a nonwoven fabric was produced by needle punching. The nonwoven fabric had a thickness of 5 mm and a weight of about 800 g.

Comparative Example 1

Using a polyester having an intrinsic viscosity of 0.64, fibers having six volume control members were produced. A fiber having a single fiber fineness of 6 Da and a fiber length of 64 mm was produced. Using this fiber, an amorphous polyester low melting point yarn was mixed in an amount of 30% by weight, and a nonwoven fabric was produced by needle punching. The nonwoven fabric had a thickness of 5 mm and a weight of about 800 g.

Comparative Example 2

Using a polyester having an intrinsic viscosity of 0.64, fibers having six volume control members were produced. A fiber having a single fiber fineness of 6 Da and a fiber length of 64 mm was produced. Using this fiber, a semi-crystalline polyester low melting point yarn was mixed in an amount of 30% by weight, and a nonwoven fabric was produced by needle punching. The nonwoven fabric had a thickness of 5 mm and a weight of about 800 g.

* How to measure

end. Sound absorption rate measurement by reverberation method

Using the equipment according to ISO 354 (KS F 2805: Sound absorption rate measurement method of reverberation room)

Respectively. The size of the specimen is 1.0m x 1.2m, and the reverberation time is

20 dB attenuation, and a 1/3 octave band sound source was used as the sound source. Frequency range

The sound absorption rate was measured in the range of 0.4 ~ 10kHz.

I. Heat resistance (tensile strength, shrinkage)

1. Tensile strength

According to KS M 6518, the tensile strength is measured after standing at 80 ± 2 ° C for 50 hours.

2. Shrinkage

150 x 150 mm The mark of 100 x 100 mm was placed in the center of the test specimen and the specimen was left at 80 ± 2 ℃ for 50 hours and maintained at a temperature of 23 ± 2 ℃ and a relative humidity of 50 ± 5% for 60 minutes. I ask.

division Example 1
(Hz) Example 2
(Hz) Comparative Example 1
(Hz) Comparative Example 2
(Hz) 0.4k 0.15 0.16 0.15 0.16 0.5k 0.19 0.19 0.20 0.19 0.63k 0.20 0.21 0.21 0.20 0.8k 0.27 0.28 0.26 0.25 1k 0.29 0.30 0.30 0.30 1.25k 0.31 0.32 0.30 0.31 1.6k 0.32 0.33 0.31 0.30 2k 0.45 0.45 0.40 0.41 2.5k 0.55 0.57 0.54 0.55 3.15k 0.56 0.57 0.55 0.54 4k 0.56 0.58 0.50 0.53 5k 0.55 0.54 0.53 0.54 6.3k 0.54 0.58 0.55 0.57 8k 0.59 0.60 0.57 0.60

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Heat resistance
(° C) The tensile strength
(MPa) 2.8 3.5 0.5 0.7 Contraction ratio
(%) 1.8 1.5 5.2 4.6

It can be confirmed that the high heat-resistant cross-section hollow fibers prepared in Examples 1 and 2 have similar and improved sound absorption performance to those of Comparative Examples 1 and 2, which were used as conventional sound absorption materials, and thus are excellent in sound absorption properties.

In addition, the average heat resistance of Examples 1 and 2 was improved to about 3.15 MPa by about 5 times as compared with the average tensile strength of 0.6 MPa of Comparative Examples 1 and 2,

  The average shrinkage ratio of Examples 1 and 2 was 1.65%, which is about three times lower than that of Comparative Examples 1 and 2, which is 4.9%.

  That is, the high heat-resistant cross-section hollow fibers prepared in Examples 1 and 2 are superior in heat resistance to those of Comparative Examples 1 and 2 which were used as conventional sound absorbing materials.

In addition, when a semi-crystalline binder fiber is used as the polyester low melting point yarn rather than the amorphous binder fiber, heat resistance at high temperature is compensated for and heat resistance is increased.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

Claims (6)

In the modified hollow fiber,
The fiber is used as polycyclohexylene dimethylene terephthalate (PCT) resin,
Wherein the fiber comprises a hollow portion, a shape retaining portion, and a volume control portion,
The volume control part may protrude in a direction opposite to the center of the fiber, the distal part may have a round shape,
Wherein the fiber satisfies the following conditions.

(3)

≥ 0.80
(4)

≥ 0.30

here,
T1: the distance from the center point M to the peak 310 is the largest value
T2: the distance from the center point M to the peak 310 is the smallest value
t1: the distance from the center point M to the valley 330 is the largest value
t2: the distance from the center point M to the valley 330 is the smallest value
CTmax: the distance from the center point M to the peak 310 on the basis of T1 is a circle formed by connecting the tangent of the volume controller 300 having the next higher order value,
CTmin: T2 is a circle formed by connecting the tangent of the volume control unit 300 having a smaller distance from the center point M to the peak 310,
Ctmax: A circle formed by connecting the tangent of the volume control unit 300 having the next higher order distance from the center point M to the peak 310 with reference to t1
Ctmin: a circle formed by connecting the tangent of the volume control unit 300 having a smaller distance from the center point M to the peak 310,
CTmax-R: Difference value between the center point (CTmaxM) and the center point (M) of CTmax
CTmin-R: Difference value between the center point CTminM of the CTmin and the center point M
Ctmax-r: Difference value between the center point (CtmaxM) and the center point (M) of Ctmax
Ctmin-r: Difference value between the center point (CtminM) and the center point (M) of Ctmin The method according to claim 1,
Wherein the uppermost portion of the end portion of the volume control portion is defined as a peak, and the portion between the volume control portions is defined as a valley.
(1) -3? Z? 4
(2) 0.9?

1.8
here,
R: radius of curvature of peak
r: radius of curvature of the valley
Z: Deviation of R and r
delete The method according to claim 1,
Wherein the volume control unit comprises 4 to 12 hollow fibers. The method according to claim 1,
Wherein the hollow portion has a hollow ratio of 15 to 30%. A fiber aggregate comprising a fiber according to any one of claims 1, 2, 4 and 5.

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