KR20160004417A - Heat adhesive Artificial Leather Non-woven Fabric with Superior Ball-Rebound and Method for Preparing the Same - Google Patents

Abstract

The present invention relates to a thermal adhesive artificial leather non-woven fabric having excellent rebound elasticity and economic efficiency. The thermal adhesive artificial leather non-woven fabric according to the present invention includes (A) 10-90 wt% of thermal adhesive elastic composite fiber, and (B) 10-90 wt% of synthetic filament selected from either nylon or polyester. The (A) thermal adhesive elastic composite fiber comprises (a1) a polyetherester elastomer and (a2) non-elastic polyester.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant artificial leather nonwoven fabric having excellent rebound resilience,

The present invention relates to an artificial leather nonwoven fabric. Specifically, the present invention relates to a thermally adhered artificial leather nonwoven fabric having excellent rebound resilience and economical efficiency.

Non-woven fabric means a fabric which is bonded or tangled by using a machine operation or chemical agent. Since it is excellent in shape stability, elasticity or compression rebound characteristics, it is possible to use a non-woven fabric such as bedding, cushioning material, It is used for various purposes. In order to ensure the physical properties of such a nonwoven fabric, it is necessary to ensure adhesion and entanglement between constituent fibers in addition to using fibers having good elasticity.

Polyurethane or polyethylene short fibers have been widely used as nonwoven materials due to their excellent elasticity. However, the nonwoven fabric produced from these materials has a disadvantage that it is not durable and can not be recycled. Accordingly, in recent years, an elastomer having excellent elasticity and being recyclable has been used as a nonwoven fabric material. Particularly, a thermoplastic elastomer (TPE), which is a block copolymer of a hard segment and a soft segment, is a material having both elasticity by a soft segment and thermoplasticity by a hard segment, and therefore is attracting attention as a nonwoven cushioning material have.

On the other hand, as a technique for imparting elasticity to nonwoven fabric through adhesion and entanglement between fibers, hot melt type bind fibers are representative. However, there is a problem that the nonwoven fabric fused by using the binder fiber is not superior in mechanical properties to the nonwoven fabric produced by using the polyurethane foam. Specifically, the low melt fiber used in the thermally bonded nonwoven fabric has no elastic restoring force among the characteristics of the polymer itself, and therefore, the cushioning feeling is lost due to the reduction in the bulky property due to repeated compression. In this connection, patent No. 0125494 discloses a nonwoven fabric made using copolymerized polyester fibers as binder fibers. The nonwoven fabric of the patent has improved durability compared to the prior art, but the rebound characteristics are still poor.

In order to solve the problems of the prior art, the inventor of the present invention has invented the thermally adhered artificial leather nonwoven fabric of the present invention having improved shape stability, elasticity and compression rebound resilience because of excellent adhesion and entanglement between short fibers.

An object of the present invention is to provide a heat-bonded artificial leather nonwoven fabric having excellent rebound resilience.

Another object of the present invention is to provide a heat-bonded artificial leather nonwoven fabric having excellent economical efficiency because it provides higher elasticity without using expensive raw materials.

These and other objects of the present invention can be achieved by the present invention described below.

The thermally adhered artificial leather nonwoven fabric according to the present invention comprises (A) 10 to 90% by weight of a thermally adhesive elastic composite fiber and (B) 10 to 90% by weight of a synthetic short fiber selected from nylon or polyester, ) The thermally adhesive elastic composite fiber is composed of (a1) a polyetherester elastomer and (a2) an inelastic polyester.

The polyetherester elastomer (a1) may include a hard segment obtained by esterifying ethylene glycol and butylene glycol with dimethyl terephthalate, and a soft segment obtained by condensation polymerization of polyethylene glycol in the esterification reaction product.

The hard segment may comprise from 1 to 50% by weight of ethylene glycol relative to the total diol component.

The non-elastic polyester (a2) may have a melting point higher than the melting point of the polyether ester elastomer (a1) by 50 占 폚 or more.

The thermally adhesive elastic conjugate fiber (A) may be in the form of a side by side whose cross section is in the form of an eccentricity.

The polyetherester elastomer (a1) and the non-elastic polyester (a2) may have a 30:70 to 70:30 area ratio in the thermally adhesive elastic conjugate fiber (A).

The fineness of the thermo-adhesive elastic conjugate fiber (A) and the synthetic staple fiber selected from the above (B) nylon or polyester may be 1 to 10 denier, respectively.

The thickness of the nonwoven fabric is 0.5 to 20 mm, and the nonwoven fabric has a rebound resilience of 25% or more as measured by the following.

The thermal bonding artificial leather nonwoven fabric according to the present invention comprises a carding step of forming a web by carding the thermally adhesive elastic composite fibers (A) and the synthetic staple fibers (B); A superimposing step of laminating the carded web; A fiber entangling step of entangling the overlapped web through needle punching; A heat bonding step of fusing short fibers of the entangled web by applying heat in a range of 150 to 190 占 폚; Subjecting the heat-bonded nonwoven fabric semi-finished product to a surface ironing treatment at a temperature of 100 to 200 캜; And impregnating the surface ironed nonwoven fabric article with polyurethane.

BRIEF DESCRIPTION OF THE DRAWINGS Fig.

Since the present invention includes the synthetic short fibers selected from (A) the thermo-adhesive elastic conjugate fiber and (B) the nylon or polyester, it is excellent in the adhesion and the entanglement between the fibers, so that not only economical efficiency but also shape stability, elasticity and rebound resilience All of which have the effect of providing an improved thermal bonding artificial leather nonwoven fabric.

FIG. 1 is a cross-sectional photograph of a thermally adhered artificial leather nonwoven fabric according to the present invention.
2 is a photograph of the surface of the thermally adhered artificial leather nonwoven fabric according to the present invention.

The present invention relates to a heat-bonded artificial leather nonwoven fabric having excellent rebound resilience and economic efficiency. The thermally adhered artificial leather nonwoven fabric according to the present invention comprises synthetic short fibers selected from (A) thermally adhesive elastic fibers and (B) nylon or polyester.

Thermal bonding  Artificial leather nonwoven fabric

(A) a thermally adhesive elastic conjugate fiber

The thermally adhesive elastic conjugate fiber (A) according to the present invention is composed of (a1) a polyetherester elastomer and (a2) an inelastic polyester.

The polyetherester elastomer (a1) is a thermoplastic elastomer (TPE), which comprises a hard segment exhibiting thermoplastic properties and a soft segment exhibiting elasticity. Wherein the hard segment is obtained by esterifying a diol component of ethylene glycol and butylene glycol with dimethyl terephthalate, and the soft segment is obtained by adding polyethylene glycol, a polymerization catalyst, a heat stabilizer and a light stabilizer to the esterification reaction product Followed by post-condensation polymerization. In the polyetherester elastomer (a1) according to the present invention, dimethyl terephthalate is used instead of expensive isophthalic acid (IPA) as an acid component in the formation of the hard segment, and polytetramethylene glycol (PTMG) Since the low-priced ethylene glycol and butylene glycol are used, the polyether ester elastomer (a1) can be produced economically.

The hard segment preferably contains 1 to 50% by weight of ethylene glycol based on the entire diol component. If the content of ethylene glycol in the diol component is out of the above range, the elastic properties of the elastomer deteriorate. The (a1) polyetherester elastomer thus produced imparts elasticity and thermal adhesiveness to the thermally adhesive elastic composite fiber (A).

The esterification reaction for forming the hard segment includes at least one selected from the group consisting of zinc acetate, sodium acetate, magnesium acetate, tetranormalbutoxy titanate, tetraisopropyl titanate, titanium oxide / silicon oxide microcopolymer, and nano titanate A catalyst may be used. Although not particularly limited, the catalyst used in the esterification reaction is preferably used in a range of 50 to 2000 ppm based on 100 parts by weight of (a1) polyetherester elastomer.

Wherein the polycondensation reaction for forming the soft segment comprises at least one condensation polymerization catalyst selected from antimony trioxide, antimony acetate, tetranormalbutoxy titanate, tetraisopropyl titanate, titanium oxide / silica oxide microcopolymer, and nano titanate Can be used. The catalyst is preferably contained in a range of 50 to 2000 ppm with respect to 100 parts by weight of the polyetherester elastomer (a1). The type of the heat stabilizer and the light stabilizer used in the condensation polymerization reaction is not particularly limited and can be appropriately selected according to known techniques.

In the case of the polyetherester elastomer (a1), it is preferable to use an elastomer having a low melting point in order to lower the permanent compression strain by improving the thermal adhesiveness of the thermally adhesive elastic composite fiber (A). Preferably, the melting point of the polyetherester elastomer (a1) is lower than the melting point of the non-elastic polyester (a2) by 50 占 폚 or more. More preferably, the melting point of the polyetherester elastomer (a1) is in the range of 140 to 170 占 폚, and the melting point of the non-elastic polyester (a2) is in the range of 190 to 220 占 폚.

The heat-adhesive elastic conjugate fiber (A) has a fineness of 1 to 10 denier, and a cross-sectional shape is formed as an eccentric side-by-side. The area ratio of the polyetherester elastomer (a1) to the non-elastic polyester (a2) in the conjugate fiber is 30:70 to 70:30. At this time, the polyetherester elastomer (a1) is preferably contained in an amount of 20 to 80% by weight based on 100% by weight of the heat-adhesive elastic composite fiber (A).

(B) Synthetic staple fibers

Synthetic staple fibers according to the present invention are intended to impart strength and form stability to heat-bonded artificial leather nonwoven fabrics, and are selected from nylons or polyesters. The synthetic staple fibers (B) are contained in an amount of 10 to 90% by weight based on 100% by weight of the entire artificial leather nonwoven fabric of the present invention.

Considering the intermixture of fibers, the fineness of the synthetic staple fibers (B) is adjusted to 1 to 10 deniers similar to the fineness of the thermally adhesive elastic fibers (A).

Thermal bonding  Manufacturing method of artificial leather nonwoven fabric

The thermally adhered artificial leather nonwoven fabric according to the present invention is characterized in that the heat-adhesive elastic composite fibers (A) and the synthetic staple fibers (B) of the present invention described above are sequentially subjected to a carding step, a superimposing step, a fiber entanglement step, Lt; / RTI >

The heat-adhesive elastic composite fiber (A) is obtained by melt-kneading the polyetherester elastomer (a1) and the non-elastic polyester (a2) through a circular side-side composite spinneret at a spinning temperature of 250 to 300 占 폚 at 800 to 1,200 m / mim at a spinning speed, followed by stretching at a stretching ratio of 2.0 to 4.0 and a stretching speed of 70 to 120 m / min. The heat-sealable elastic conjugated fiber A thus produced has a cross-sectional shape of an eccentric side-by-side shape and a fineness of 1 to 10 denier,

The carding process refers to a process of combing entangled fibers in a side-by-side arrangement and forming a web in which short fibers are oriented in the direction of the nonwoven fabric surface and in the horizontal direction. Also in the case of the present invention, a carding process used for general nonwoven fabric production can be applied. However, it is preferable that the fiber length of the thermally adhesive elastic conjugate fiber (A) and the synthetic staple fiber (B) is adjusted to 20 to 100 mm. If it exceeds the above range, the defective rate of the carding process becomes high, and the rebound resilience of the nonwoven fabric may be lowered.

The overlapping process is a process of adjusting the thickness of the nonwoven fabric, and refers to the lamination of the carded web in two or more layers. It is preferable to adjust the thickness of the nonwoven fabric to 0.5 to 20 mm in consideration of convenience of manufacture, ease of use, or rebound resilience.

The fiber entanglement process refers to a process that imparts entanglement to a nonwoven web through needle punching. Repeated upward and downward movement of needles repeatedly on the surface or backside of the nonwoven fabric tends to entangle the webs to impart a uniform thickness and density to the nonwoven fabric. In the case of the present invention, a general fiber entanglement process can also be used.

The heat bonding process refers to a process of applying heat to an entangled web to fuse short fibers on the web. A commonly used thermal bonding process may be employed, but it is advisable to design the process conditions so that sufficient shrinkage occurs in the web utilizing a net dryer or tenter facility. Preferably, the drying temperature is limited to the range of 150 to 190 占 폚.

Cross sections and surface photographs of the heat-bonded artificial leather nonwoven fabric produced from the above are shown in FIG. 1 and FIG. 2, respectively. From the first road, it can be seen that, in the case of the nonwoven fabric produced according to the present invention, the monofilaments constituting the nonwoven fabric have uniform fineness and are thermally fused, and from the second road, It can be confirmed that they are formed uniformly with the density.

The present invention can be better understood by the following examples, which are for the purpose of illustration only and are not intended to limit the scope of protection of the present invention.

Example

Thermal adhesion  Fabrication of elastic composite fibers

Ethylene glycol and butylene glycol, which are the raw materials of the hard segment, are esterified with dimethyl terephthalate under a catalyst (tetra-n-butoxy titanate), and polyethylene glycol as a raw material of a soft segment and a polymerization catalyst Nat), heat stabilizer (IGANOX 1010), and light stabilizer (TINUVIN 770DF) were added and the polycondensation reaction proceeded to prepare a polyetherester elastomer.

40% by weight of the prepared polyetherester elastomer and 60% by weight of the non-elastic polyester were spun through a circular side-by-side composite spinneret at a spinning temperature of 280 DEG C at a spinning speed of 1,000 m / min, And stretched to obtain a thermally adhesive elastic conjugate fiber.

High elasticity  Production of nonwoven fabric

The heat-resilient elastic composite fiber and the general polyester short fiber were mixed with each other to prepare a highly elastic nonwoven fabric of the present invention. Specifically, after the thermally adhesive elastic fibers and the general polyester short fibers were subjected to a carding process to form a web, the thickness was adjusted by a superimposing process, a fiber entanglement process was performed by needle punching, Followed by thermal bonding to produce a nonwoven fabric.

The thermally bonded nonwoven fabric was impregnated with polyurethane according to a known method to produce a high elasticity nonwoven fabric for artificial leather having excellent rebound resilience. The rebound resilience of the nonwoven fabric was measured by the following method.

* Ball Rebound: The rebound resilience was measured by a method similar to ASTM D 3574. The height at which the marbles collide with the nonwoven fabric was measured after dropping the marbles at a height of 1 m from the nonwoven fabric, and the height of the falling marbles and the height of the marbles were determined as% ratios.

At this time, the iron beads used in the experiment had a diameter of 16 ± 0.5 mm and a weight of 16.8 ± 1.5 g, and the size of the nonwoven fabric was 250 mm ² .

[Table 1]

It can be seen from the above Table 1 that the nonwoven fabric according to the present invention produced by mixing the thermally adhesive elastic conjugate fiber and the general polyester short fibers has better rebound resilience than the nonwoven fabric of the comparative example. Particularly, it can be confirmed from the examples that the rebound resilience of the nonwoven fabric becomes better as the content ratio of the thermally adhesive elastic composite fiber produced according to the present invention increases.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

(A) 10 to 90% by weight of a thermally adhesive elastic composite fiber;
(B) 10 to 90% by weight synthetic short fibers selected from nylon or polyester;
, Wherein the thermally adhesive elastic composite fiber (A) is composed of (a1) a polyetherester elastomer and (a2) an inelastic polyester.
The polyurethane elastomer composition according to claim 1, wherein the polyether ester elastomer (a1)
A hard segment obtained by esterifying ethylene glycol and butylene glycol, which are diol components, with dimethyl terephthalate; And
A soft segment obtained by condensation polymerization of polyethylene glycol in the esterification reaction product;
Wherein the thermally bonded artificial leather nonwoven fabric is a thermally bonded nonwoven fabric.
The thermally bonded artificial leather-bound nonwoven fabric according to claim 2, wherein the hard segment comprises ethylene glycol in an amount of 1 to 50% by weight based on the entire diol component.
The thermally bonded artificial leather-bound nonwoven fabric according to claim 1, wherein the melting point of the non-elastic polyester (a2) is 50 ° C or more higher than the melting point of the polyether ester elastomer (a1).
The thermally adhered artificial leather-like nonwoven fabric according to claim 1, wherein the thermally adhesive elastic conjugate fibers (A) are side by side in the cross-sectional eccentric shape.
The heat-resistant elastic composite fiber according to claim 1, wherein the polyetherester elastomer (a1) and the non-elastic polyester (a2) have an area ratio of 30:70 to 70:30 in the heat- Adhesive artificial leather nonwoven fabric.
The thermally adhered artificial leather-like nonwoven fabric according to claim 1, wherein the thermally adhesive nonwoven fabric has a fineness of 1 to 10 denier for the thermally adhesive elastic conjugate fiber (A) and the synthetic fiber (B), respectively.
The thermally bonded artificial leather-bound nonwoven fabric according to any one of claims 1 to 7, wherein the nonwoven fabric has a thickness of 0.5 to 20 mm, and the nonwoven fabric has a rebound resilience of 25% or more as measured by the following.

A carding step of forming a web by carding the thermally adhesive elastic conjugate fibers (A) and the synthetic staple fibers (B) according to any one of claims 1 to 7;
A superimposing step of laminating the carded web;
A fiber entangling step of entangling the overlapped web through needle punching;
A heat bonding step of fusing short fibers of the entangled web by applying heat in a range of 150 to 190 占 폚;
Subjecting the heat-bonded nonwoven fabric semi-finished product to a surface ironing treatment at a temperature of 100 to 200 캜; And
Impregnating the surface ironed nonwoven fabric article with polyurethane;
Wherein the thermally adhering leather-bound nonwoven fabric is formed of a thermally bonded synthetic resin.

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