KR101083774B1 - Leather-like Composite sheet with excellent shrinkage properties - Google Patents

Abstract

The present invention relates to a leather-like composite sheet having excellent elongation characteristics, wherein microfibers having a single yarn fineness of 0.001 to 0.3 denier are bonded to an artificial leather (A) in which a polymer elastic body is impregnated in an interwoven nonwoven fabric and the back side of the artificial leather. It consists of a reinforcing fabric (B), the holes (H) penetrating the artificial leather (A) and the reinforcing fabric (B) is formed regularly, and the transverse tensile strength and longitudinal tensile strength are respectively 35 ~ 60kgf / 50㎜, characterized in that each of the transverse static load elongation and longitudinal static load elongation under 8kgf load is 8-25%.

The present invention is provided with an appropriate elongation characteristics to maintain good shape stability even during long-term use, excellent cushioning and feel, excellent sewing and mounting workability, high tensile strength and excellent durability.

Composite sheet, artificial leather, vehicle, elongation, reinforcing fabric, static load elongation, shape stability, durability

Description

Leather-like composite sheet with excellent shrinkage properties

The present invention relates to a leather-like composite sheet having excellent elongation characteristics. More specifically, the present invention relates to a leather composite sheet having excellent elongation characteristics. The present invention relates to a leather-like composite sheet having excellent durability, high tensile strength and suitable for a vehicle.

Artificial leather is composed of a nonwoven fabric in which microfibers are intertwined in three dimensions and a polymer elastomer impregnated in the nonwoven fabric. The artificial leather has excellent feel, light effect and drape, and has a soft texture and unique appearance similar to that of natural leather. BACKGROUND ART It is widely used as a sheet skin material or interior material of a vehicle (hereinafter, referred to as "vehicle") for transportation such as trains and ships.

Artificial leather used for vehicle materials (hereinafter referred to as "vehicle artificial leather") is required for durability and shape stability against friction and external force, and is suitable for bending and mounting work due to its characteristics of being used in many curved areas. This is required.

Korean Patent No. 10-0681377 discloses a method of imparting elasticity to artificial leather using a nonwoven fabric manufactured to have anisotropy by appropriately controlling the orientation structure of fibers in the nonwoven fabric. However, the artificial leather produced by the conventional method is low in form stability because the elasticity is given only by the anisotropy of the non-woven fabric has caused a problem that is not suitable for artificial leather for vehicles.

In another conventional technology, Republic of Korea Patent No. 0658097, by manufacturing a artificial leather by filling a polyurethane in a composite sheet produced by needle punching a nonwoven fabric and a fabric or knitted fabric with a static load elongation of 10 to 30%, artificial leather produced Although a method of imparting good elongation characteristics to the related art is disclosed, the artificial leather manufactured by the conventional method has a problem in that deformation occurs during long-term use.

Another conventional technique has been proposed a method of imparting good elongation characteristics and high sensitivity by forming holes in the artificial leather at regular intervals, such as by punching (punching), the vehicle artificial leather manufactured by the above method elongation This became too large and there existed a problem that shape stability fell.

Another conventional technology for solving the above problems has been proposed a method for manufacturing a composite sheet for a vehicle by adhering a reinforcing fabric such as fabric or knitted fabric on the back of artificial leather perforated at regular intervals, but for the vehicle Composite sheet has a problem that the static load elongation is greatly reduced due to the reinforcing fabric attached to the back of the artificial leather.

In another conventional art, a composite sheet is manufactured by bonding a reinforcing fabric such as a knitted fabric or fabric on the back side of artificial leather, and then punching the composite sheet at regular intervals to make holes through the composite sheet on the composite sheet. The composite sheet for a vehicle formed at regular intervals has been proposed, but the composite sheet for a vehicle manufactured by the conventional method is loosened the yarns constituting the reinforcing fabric by punching, the tensile strength of the reinforcing fabric is greatly reduced, thereby causing a long time use There is a problem that the durability and shape stability of the composite seat for a vehicle is worsened.

In order to solve the above-mentioned problems, the present invention is provided with proper elongation characteristics and excellent cushioning and feel while maintaining good shape stability even in long-term use, excellent sewing and mounting workability, high tensile strength and durability It is also excellent to provide a leather composite sheet suitable for a vehicle.

In addition, the present invention is to provide a method for producing the leather composite sheet.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, the artificial leather (A) and the artificial leather back surface of the artificial leather impregnated with a polymer elastomer in a nonwoven fabric in which microfibers having a single yarn fineness of 0.001 to 0.3 denier are entangled with each other, as shown in FIG. 1. It is composed of a reinforcing fabric (B) bonded to the, the artificial leather (A) and the hole (H) penetrating through the reinforcing fabric (B) is formed, and the transverse tensile strength and longitudinal tensile strength respectively It is 35-60kgf / 50mm, and the transverse static load elongation and longitudinal static load elongation under 8kgf load are respectively 8-25%.

1 is a schematic cross-sectional view of a leather composite sheet according to the present invention, in Fig. 1 A is a perforated artificial leather, B is a reinforcing fabric, C is a composite sheet, H represents a hole perforated in the composite sheet.

In the present invention, the term "leather composite sheet" refers to the artificial leather (A) on one side of the reinforcing fabric (B) is bonded to the sheet perforated at a predetermined interval as a sheet used as a skin material or interior material of the vehicle Means water.

The reinforcing fabric B in which the hole H is formed is preferably 15-50% in the transverse static load elongation and the longitudinal static load elongation under 8 kgf load, and the woven fabric, knitted fabric, nonwoven fabric, and the diameter are 1 to 1,000 nm. It is 1 type selected from the web (Web) and film which consists of phosphorus nanofibers.

The reinforcing fabric (B) is preferably composed of polyester-based yarns such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, nano webs and films, and the like.

The polymer elastomer is a polyurethane resin, a polyurea resin, or the like, and a polyurethane resin is most preferable in view of workability.

The ultrafine fibers are polyamide fibers, polyester fibers, and the like, but the present invention does not specifically limit the kind of ultrafine fibers.

Single yarn fineness of the ultrafine fibers is 0.001 ~ 0.3 denier.

If the single yarn fineness is less than 0.001 denier, the strength of the artificial leather is lowered. If the single yarn fineness is more than 0.3 denier, the touch and lighting effect of the artificial leather is lowered.

Leather composite sheet (C) according to the present invention is a transverse tensile strength and longitudinal tensile strength of 35 ~ 60kgf / 50mm respectively.

If the transverse tensile strength and the longitudinal tensile strength are less than 35 kgf / 50 mm, the durability of the leather composite sheet is lowered, and if it exceeds 60 kgf / 50 mm, the touch and elongation characteristics are deteriorated.

The composite composite sheet according to the present invention has a transverse static load elongation of 8 to 25% under 8 kgf load, and a transverse static load elongation of 8 to 25% under 8 kgf load.

When the transverse static load elongation and the transverse static load elongation are less than 8%, the elasticity is insufficient, which makes sewing and mounting work difficult, and the cushioning feel is lowered.

In the present invention, the transverse and longitudinal static load elongations under the single yarn fineness of the ultrafine fibers and the 8 kgf load of the composite sheet are measured by the following method.

Single yarn fineness (denier) of microfiber

A cross-sectional sample of the prepared leather composite sheet was taken and subjected to a preparation process such as gold coating, and a cross-sectional photograph of the leather composite sheet was taken at a constant magnification through a scanning electron microscope [SEM] analyzer. After evaluating the diameter of the microfiber strand shown in the picture and converting it to the actual value, the fineness was obtained through the following formula.

Fineness (denier) = 9πD ² ρ / 4000

Where π is the circumference, D is the microfiber cross-sectional diameter (μm), and ρ is the microfiber density value (g / cm 3). For reference, the density of nylon is 1.14, and the density of polyethylene terephthalate is 1.38.

Static load elongation (%)

Take three leather composite sheet test specimens of width 50 mm and length 250 mm in the longitudinal and transverse directions, respectively, and draw a 100 mm mark at the center. This is mounted on a fatigue tester (*) with a clamp spacing of 150 mm and gently loaded with a load of 78.4 N (8 kgf) (including the lower clamp). Allowed to stand for 10 minutes to load gun as, after obtaining a distance (ℓ ₀₎ between the mark obtained the constant load elongation by the formula:

Constant load elongation (%) = ℓ ₀ - 100

In the above formula, L ₀ is the distance between the marks (mm) after standing for 10 minutes under a load of 8 kg.

The fatigue tester uses a 'maleens fatigue tester'.

Tensile strength (kgf / 50㎜)

Five pieces of test piece having a width of 50 mm and a length of about 250 mm are taken in the vertical and horizontal directions, respectively.

The upper part of the test piece is clamped in a densier-type or equivalent tensile tester, and an appropriate superload is applied so that the test piece is straight and aligned with the vertical line, and the clamp spacing is 150 mm.

Super-load refers to the load required to spread unnatural wrinkles or warpage. Unless otherwise specified, 1.96 N (200 gf) shall be used.

It pulled at the speed | rate of 200 mm / min, the load (kgf / 50 mm) required for cutting | disconnection was measured, and it represented by the average value of 5 pieces, respectively vertically and horizontally.

In the present invention, the longitudinal direction and the transverse direction refer to the machine direction and the width direction when the product is made, and in actual products, the method of distinguishing the tenter pin marks, the direction of the needle tracks, the direction of brushing formed during buffing, and the inserted direction It can be easily checked based on the direction of the fabric, the direction of the bonded fabric, and the like.

On the other hand, the manufacturing method of the leather-like composite sheet according to the present invention has a transverse static load under 8kgf load on the back side of artificial leather (A) impregnated with a polymer elastic body in a nonwoven fabric in which microfibers having a single yarn fineness of 0.001 to 0.3 denier are intertwined with each other. Bonding the reinforcing fabric (B) having an elongation and longitudinal static elongation of 10 to 30%, respectively, and then punching the holes to penetrate the artificial leather (A) and the reinforcing fabric (B). It is characterized by forming.

The artificial leather, specifically, the artificial leather before being drilled, shortens the island-in-the-sea composite fiber composed of alkali-soluble sea component and island component having single yarn fineness of 0.001 to 0.3 denier after elution. After preparing the nonwoven fabric by lapping and needle punching, the nonwoven fabric is impregnated with the polymer elastomer, and then the sea component is eluted by treating the nonwoven fabric impregnated with the polymer elastomer with an aqueous alkali solution, followed by buffing and dyeing.

Next, an example of a method of manufacturing the leather-like composite sheet according to the present invention will be described in detail.

First, in the present invention, the island-in-the-sea composite fiber composed of sea component which is an alkali-soluble copolyester and island components having a single yarn fineness of 0.001 to 0.3 denier is dispersed in the sea component, and then opened, carded, cross-wrapped and Needle punching produces a nonwoven fabric. If necessary, insert a fabric or knitted fabric with elongation and strength appropriate for the application as a reinforcing material through a needle punching method of 500 to 2000 ppsc. The inserted reinforcement fibers are fine fibers of 0.3 denier or less after the elution process, and most preferably fibers having the same thickness as those of the island-based microfine fibers.

Next, the nonwoven fabric is impregnated with a polymer elastomer and then treated with an aqueous alkali solution to elute the sea component to produce a nonwoven fabric with the polymer elastomer impregnated in a nonwoven fabric in which microfibers having a single yarn fineness of 0.001 to 0.3 denier are intertwined with each other. do.

Meanwhile, in the present invention, the nonwoven fabric prepared as described above may be first treated with an aqueous alkali solution to elute the sea component, and then impregnated with the polymer elastomer.

Alkali-soluble copolyester as the sea component has polyethylene terephthalate as a main component, and is an additional component with a molecular weight of 400 to 20000, most preferably 1000 to 4000 polyethylene glycol, polypropylene glycol, 1,4-cyclohexanedicar Acids, 1,4-cyclohexanedimethanol, 1,4-cyclohexanedicarboxylate, 2,2-dimethyl-1,3-propanediol, 2,2-dimethyl-1,4-butanediol, 2, 2,4-trimethyl 1,3-propanediol and copolyester obtained by copolymerizing 25% by weight or less of one or two or more selected from adipic acid.

Polyurethane resins, polyurea resins, polyacrylic acid resins, and the like may be used as the polymer elastomer, but a polyurethane resin is preferable in view of processability, wear resistance, hydrolysis resistance, and the like.

The weight ratio of the fibrous base composed of the polymer elastomer / fine fiber is preferably 10/90 to 70/30.

When the weight ratio of the polymer elastomer is less than 10% by weight, the cushioning property is too low, and when it exceeds 70% by weight, the feel and light effect are too low.

The method of filling the polymer elastomer may be applied by wet coagulation or dry coagulation after impregnating and / or applying the organic solvent solution or the aqueous dispersion of the polymer elastomer to the nonwoven fabric.

As the organic solvent of the polymer elastomer, toluene, acetone, methyl ethyl ketone and the like can be used in addition to polar solvents such as dimethylformamide, dimethylacetamide, and dimethyl sulfoxide.

Next, the artificial leather is manufactured by buffing and dyeing the nonwoven fabric prepared as described above and impregnated with a polymer elastic body.

Next, the reinforcing fabric (B) having a transverse static load elongation and a longitudinal static load elongation of 10 to 30%, respectively, is bonded to the back side of the artificial leather (A) by the process shown in FIG. Punching to produce a leather-like composite sheet (C) in which holes (H) are perforated regularly.

Figure 2 is an exemplary process of bonding the artificial leather (A) and the reinforcing fabric (B), after coating the adhesive with an adhesive coating device (3) on the artificial leather (A), the reinforcing fabric (B) thereon ), A method of drying and winding by passing it through the calendar roll (4) is shown.

The present invention is provided with an appropriate elongation characteristics to maintain good shape stability even during long-term use, excellent cushioning and feel, excellent sewing and mounting workability, high tensile strength and excellent durability.

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples.

However, the present invention is not limited by the following examples.

Example 1

The island-in-the-sea composite fiber (single-fiber fineness: 0.05 denier of the island component) composed of the sea component of the alkali-soluble copolyester and 70 island components of the polyester resin dispersed and dispersed in the sea component is cut to a length of 50 mm to form short fibers. After the lamination web of the islands-in-the-sea composite short fibers was manufactured through a carding and cross wrapper process, needle punching was performed to prepare a nonwoven fabric of the island-in-the-sea composite fiber.

Next, the prepared nonwoven fabric was impregnated with 40% by weight of the polyurethane resin relative to the nonwoven fabric, and then wet coagulated, and then eluted with seawater in the island-in-the-sea composite fiber by treating with an aqueous alkali solution (caustic soda solution). Artificial leather was prepared by dyeing.

Next, a polyester fabric (reinforcement fabric) having a transverse static load elongation of 10% under 8kgf load and a transverse static load elongation of 15% under 8kgf load by the process shown in FIG. 2 on the back side of the artificial leather (A). , B) were bonded, and then punched out to form holes having a diameter of 0.1 mm to prepare a leather-like composite sheet (C).

The transverse and longitudinal spacings of the holes were each 2 cm.

Table 2 shows the results of measuring the transverse static load elongation at 8 kgf, longitudinal static load elongation, transverse tensile strength and longitudinal tensile strength at 8 kgf of the composite composite sheet.

Examples 2 to 5 and Comparative Examples 1 to 2

A leather composite sheet was manufactured under the same process and conditions as in Example 1, except that the type of reinforcing fabric (B), insertion of reinforcing material into artificial leather (A), and physical properties were changed as shown in Table 1.

Table 2 shows the results of measuring the transverse static load elongation at 8 kgf, longitudinal static load elongation, transverse tensile strength and longitudinal tensile strength at 8 kgf of the composite composite sheet.

Manufacture conditions division Reinforcement Fabric (B) Type Whether reinforcement is inserted in artificial leather (A) Static load elongation (%) under 8kgf load of reinforcing fabric (B) Landscape Portrait Example 1 Polyester fabric × 16 21 Example 2 Polyester knit × 19 19 Example 3 Polyester
Non-woven × 21 15 Example 4 Polyester
Nanofiber web × 16 19 Example 5 Polyester knit ○ (insert fabric) 21 22 Comparative Example 1 Polyester fabric × 9 7 Comparative Example 2 Polyester knit × 52 55

Physical property composite sheet evaluation results division Static Elongation at Load under 8kgf (%) Tensile Strength (kgf / 50㎜) Landscape Portrait Landscape Portrait Example 1 13 17 48 41 Example 2 17 17 40 40 Example 3 17 13 39 49 Example 4 13 14 47 49 Example 5 15 13 42 50 Comparative Example 1 5 6 68 62 Comparative Example 2 27 26 24 25

1 is a schematic cross-sectional view of a leather-like composite sheet according to the present invention.

Figure 2 is an exemplary process for bonding the artificial leather (A) and the reinforcing fabric (B).

* Explanation of symbols on the main parts of the drawings

A: Artificial leather B: Fabric for reinforcement

H: Perforated hole in artificial leather C: Composite sheet

1: artificial leather supply roller 2: reinforcement fabric supply roller

3: adhesive coating device 4: calendar roll 5: drying device

6: composite sheet winding roller

Claims (10)

It consists of artificial leather (A) impregnated with a polymer elastic body in a nonwoven fabric in which microfibers having a single yarn fineness of 0.001 to 0.3 denier are intertwined with each other, and a reinforcing fabric (B) bonded to the back side of the artificial leather. Holes H penetrating through A) and reinforcing fabric B are formed, and the transverse tensile strength and the longitudinal tensile strength are 35 to 60 kgf / 50 mm, respectively, and the transverse static load elongation and longitudinal direction at 8 kgf load. Leather composite sheet, characterized in that each static load elongation is 8-25%. The leather composite sheet according to claim 1, wherein the reinforcing fabric B having the holes H is 15 to 50% in the transverse static load elongation and the longitudinal static load elongation under 8 kgf load, respectively. The method of claim 1 or 2, wherein the reinforcing fabric (B) is a leather, characterized in that one selected from woven fabrics, knitted fabrics, non-woven fabrics, a web (Web) and film consisting of nanofibers with a diameter of 1 ~ 1,000nm. Composite sheet. According to claim 1, The artificial leather (A) is a leather composite sheet, characterized in that the fabric or knitted fabric contained therein. The leather-like composite sheet according to claim 1, wherein the polymer elastomer is one selected from a polyurethane resin and a polyurea resin. Reinforcement of 10 ~ 30% of transverse static load elongation and transverse static load elongation under 8kgf load on the back side of artificial leather (A) in which superfine fibers with single yarn fineness of 0.001 ~ 0.3 denier are impregnated with polymer elastic body in interwoven nonwoven fabric Bonding the fabric for fabric (B), and then punching it to form a hole (H) penetrating through the artificial leather (A) and the reinforcing fabric (B). 7. The artificial leather of claim 6, wherein the synthetic leather is impregnated in a nonwoven fabric in which microfibers having a single yarn fineness of 0.001 to 0.3 denier are entangled with each other, and the single yarn fineness is 0.001 to 0.3 denier after elution of the alkaline soluble sea component. After short fiber of island-in-the-sea composite fiber composed of island components, carding, cross-lapping and needle punching to prepare a nonwoven fabric, impregnated with a polymeric elastomer in the nonwoven fabric, and then treated with an aqueous alkali solution of the nonwoven fabric impregnated with the polymeric elastomer And eluting the sea component, followed by buffing and dyeing to produce the composite sheet. 7. The artificial leather of claim 6, wherein the synthetic leather is impregnated in a nonwoven fabric in which microfibers having a single yarn fineness of 0.001 to 0.3 denier are entangled with each other, and the single yarn fineness is 0.001 to 0.3 denier after elution of the alkaline soluble sea component. After the island-in-the-sea composite fiber composed of island components is short-fiber, carding, cross-lapping and needle punching to produce a non-woven fabric, and the non-woven fabric, one selected from the fabric and knitted fabrics are additionally needle punched and integrally combined, and then A method for producing a leather composite sheet, comprising impregnating a polymer elastic body into an integrated nonwoven fabric, then treating the nonwoven fabric impregnated with the polymer elastic body with an aqueous alkali solution to elute the sea component, and then buffing and dyeing. The method of claim 6, wherein the reinforcing fabric (B) is a fabric, knitted fabric, non-woven fabric, the production of a leather-like composite sheet characterized in that one selected from the web (Web) and film consisting of nanofibers with a diameter of 1 ~ 1,000nm. Way. The method for producing a leather-like composite sheet according to claim 6, wherein the polymer elastomer is one selected from a polyurethane resin and a polyurea resin.

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