KR100335628B1 - Artificial leather for upper leather of golf shoes - Google Patents

Abstract

PURPOSE: Artificial leather for the upper leather of golf shoes is characterized by having excellent shape stability, fullness, flexibility, crease property and wearing feeling. CONSTITUTION: Artificial leather comprising superfine fiber and a polyurethane elastomer is obtained by the steps of: preparing binary conjugate staple fiber for superfine yarn comprising nylon and copolymerized polyester; preparing 20-80wt.% of nylon staple fiber; mixing the binary conjugate staple fiber and the nylon staple fiber in a ratio of 50:50, followed by opening and carding; needle-punching to manufacture non-woven fabric; padding into 10% of a caustic soda aqueous solution, followed by squeezing; eluting a sea ingredient; washing and drying; padding a polyvinyl alcohol aqueous solution on the non-woven fabric, followed by drying; infiltrating the polyurethane elastomer into the non-woven fabric sheet; and then buffing with a sand paper. The polyurethane elastomer has 120-130kg/cm¬2 of modulus for 100% of elongation.

Description

Artificial leather for golf shoes upper

The present invention relates to an artificial leather for golf uppers, and more particularly, in an artificial leather composed of an ultrafine fiber bundle and a polyurethane elastic body, the fiber bundle is 20 to 80% by weight with respect to the microcomponent bicomponent composite staple fiber and the total fiber weight. The present invention relates to an artificial leather for golf uppers having excellent morphological stability, wrinkle characteristics, and faithfulness, which is composed of a synthetic fiber staple fiber, and composed of a polyurethane elastic body having a modulus of 120 to 130 kg / cm 2 at 100% elongation.

As a material for uppers of golf shoes classified as specialized, conventionally, synthetic leather obtained by using natural leather or by processing polyurethane resin or wet formable nylon on nonwoven fabric of general yarn has been mainly used. Form stability, flexibility, wrinkle characteristics and fidelity are required for golf upper materials, but conventional natural leather has bad shape stability against moisture and water and has a heavy disadvantage. Synthetic leather has poor wrinkle characteristics and faithfulness. Due to the shortcomings, there has been a demand for the development of new golf upper materials.

An object of the present invention is to meet the requirements as described above, to provide an artificial leather for golf shoes upper excellent in shape stability, fidelity, flexibility and wrinkle characteristics, no deformation during storage or wearing and good fit.

That is, the present invention is an artificial leather composed of a microfine fiber bundle and a polyurethane elastic body, the fiber bundle is composed of a microfine bicomponent composite staple fiber and a synthetic fiber staple fiber having a weight of 20 to 80% by weight based on the total fiber weight, 100 It is to provide an artificial leather for golf shoes upper, characterized in that the elastic modulus of 120 to 130kg / ㎠ modulus at% stretch.

Hereinafter, the present invention will be described in more detail.

In the artificial leather of the present invention, in order to meet the characteristics required for the golf upper material, in order to meet the characteristics required for the nonwoven fabric manufacturing step using a non-woven fabric using the ultrafine composite two-component staple fiber and synthetic fiber staple fiber as a bubble gave a polyurethane, Impregnation of high modulus polyurethane elastomer in the impregnation process improved morphological stability, fidelity and wrinkle properties.

In the present invention, the mixing ratio of the ultrafine two-component staple fiber is preferably 50% or more, but when the mixing ratio is less than 50%, the shape stability is lowered. In addition, nylon is suitable as a synthetic fiber staple fiber constituting the artificial leather of the present invention.

If the composition ratio of the synthetic fiber staple is less than 20% by weight based on the total fiber weight, the present invention cannot satisfy the hardness required for golf uppers, and no uniform mixing with the ultrafine bicomponent composite staple fiber is achieved. On the contrary, if the composition ratio of the synthetic fiber staple exceeds 80% by weight with respect to the total fiber weight, the bending is unnatural and the wrinkles are enlarged, the appearance becomes coarse and the feel is too hard, and the wear is poor. Therefore, the composition ratio of the synthetic fiber staple fiber in the present invention is essential to be within the above range.

The polyurethane elastic body constituting the artificial leather of the present invention has a modulus of 120 to 130 kg / cm 2 at 100% elongation. When the modulus is less than 120kg / cm 2 when the polyurethane elastic body impregnated into the non-woven fabric bubble in the present invention is too pliable, the forge becomes brittle and lacks a sense of high visibility, and the heat setting is lowered. As this elapses, a problem arises. Modulus at 100% elongation of a polyurethane elastomer is calculated by the following formula.

* Modulus at 100% elongation = Load at 100 elongation (kg) / Cross-sectional area of test piece (㎠)

In addition, the length of the synthetic fiber staples used in the present invention should be 45mm ~ 60mm, if the length is less than 45mm or more than 60mm, opening and mixing properties during the manufacturing of the sub-pore is reduced by parts in the final product Difference in touch occurs, and color difference occurs at each site during dyeing.

The fineness of the synthetic fiber staples used in the present invention is 1.5 denier or less, and when the fineness exceeds 1.5 denier, the touch of the final product is hardened, and the fineness difference with the fine fibers used in the manufacture of nonwoven fabric is increased, thereby opening and mixing properties It is lowered and finally the difference of the touch by site occurs, which is undesirable.

Artificial leather for golf shoes upper of the present invention can be produced by the following method, for example.

First, microfine bicomponent composite staple fiber and 20 to 80% by weight of the total fiber weight are mixed so that the mixing ratio of the microfine composite staple fiber is 50% or more. Then, needle punching is performed to produce a three-dimensional interwoven nonwoven fabric.

Microfiber composite fiber usable in the present invention is a composite spinning or mixed spinning of two kinds of polymer materials capable of forming filament in the form of sea / island (海 / island). As a co-constituent, a modified polyester in which the crystallinity of the yarn is controlled to less than 35% by copolymerizing a macromolecular molecule composed of an aromatic chain in the polyethylene terephthalate backbone is used. As the copolymerized component, 2,2-bis- (4 (2- Hydroxyethoxy) phenol) propane, 2- (4 (2-hydroxyethoxy) phenol) propane, or 2- (4- (2- (2-hydroxyethoxy) ethoxy) phenol) propane It is possible to do As the sea component, copolyester, polystyrene, polyethylene, and the like, which have different solvent soluble properties and solvents, may be used.

Subsequently, the alkali component reduction method removes sea components of the ultrafine two-component composite staple fiber and makes it extremely fine. At this time, if the sea component is copolymerized polyester, the sea component is decomposed by treating with 5 to 15% aqueous solution of caustic soda in a continuous or batch manner, and if the sea component is polyethylene or polystyrene, toluene or pychloroethylene Remove At this time, the nonwoven fabric has some thickness reduction due to the removal of the sea component, but the shape is maintained and the elongation in the longitudinal direction due to the mechanical tension is not large.

Next, the microporous nonwoven fabric is padded with a water-soluble polymer solution such as polyvinyl alcohol or carboxymethyl cellulose at a concentration of 3 to 15% and dried to give 5 to 10% by weight of the fiber. This process is effective not only in stabilizing the shape of the bubbles but also in preventing the subsequent wet processing polyurethane from excessively adhering to the fiber bundle to harden the touch.

Next, the polyurethane woven wet impregnation is performed on the nonwoven fabric. Polyurethane elastomer used in this process is a linear polymer composed of macroglycol, diisocyanate and low molecular weight diol with molecular weight of 500 to 3,000 having a modulus of 120 to 130 kg / cm 2 at 100% elongation and is easily soluble in formamide (DMF). Dissolves. As the polyurethane elastomer used in the present invention, polyether glycol, polyester glycol, polyether polyester copolymer glycol, polycarbonate glycol, etc. may be applied as macroglycol, and as diisocyanate, usually 4,4'-diphenylmethane Diisocyanate, tolylene diisocyanate, hexamethylene diisocyanate or 4,4'-dicyclohexyl methane diisocyanate. In the present invention, as the low molecular weight diol, 4,4'-butanediol, ethylene glycol, and the like are used, and a diamine-based chain elongation is also applicable. A surfactant, a coloring pigment, an antioxidant, and the like are added to the DMF solution of the polyurethane elastomer to be used as an impregnation solution. After impregnation, the polyurethane is solidified, washed with hot water at 50 to 70 ° C., and the dried water-soluble polymer is completely removed and then dried.

Subsequently, the surface of the leather-like sheet thus obtained is buffed with a buffing paper equipped with sand paper of appropriate roughness to prepare surface wool, and after dying, and finally treating functional preparations such as softeners, water repellents, and antistatic agents, Leather is manufactured.

Artificial leather for golf uppers of the present invention is excellent in shape stability, faithfulness, wrinkle characteristics, there is no deformation of the material during storage or wearing after shoemaking, it is flexible and has an excellent fit.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited by the following Examples.

Example 1

The ultrafine two-component composite staple fiber was prepared with 65 parts of nylon-6 as a island component, and 35 parts of copolyester as a sea component to produce a composite fiber staple having a length of 2 inches, a fineness of 3 deniers and a crimp number of 12 to 18 pieces / inch. . At this time, the number of island components was set to 36 pieces per filament. In addition, general yarn staple fibers produced nylon staple fibers having a length of 2 inches, a fineness of 1.5 deniers, and a crimp number of 12-18 pieces / inch. The two fibers were mixed at 50:50 to open, carded, and needle punched to produce a three-dimensional entangled nonwoven fabric having a weight of 460 g / m 2 and a thickness of 2.38 mm. Subsequently, the solution was padded in a 10% aqueous solution of caustic soda and squeezed, followed by alkali reduction processing to elute the sea component, and the fibers were ultrafine under washing and drying. At this time, the ultrafine two-component composite staple fiber was microfiberized to about 0.05 denier. At this time, the fore was 1.45 mm thick.

Next, the polyvinyl alcohol 5% aqueous solution was padded on the nonwoven fabric and dried to stabilize the shape. Then, the dimethylformamide solution of 13% polyether-based polyurethane elastomer having a modulus of 125 kg / cm 2 at 100% elongation was impregnated into the nonwoven sheet. After coagulation, the coagulated water in the forge was impregnated with water and dried in a conventional manner.

Subsequently, the forge was buffed with a conventional 400 mesh sand paper to uniformly thicken 1.6 mm to prepare an artificial leather for golf uppers of the present invention, and evaluated for physical properties. The results are shown in Table 1 below.

[Property evaluation method]

(1) Tensile strength and elongation: KSK-0520,

(2) Tear strength: KSK-0536,

(3) Tensile strength, tensile elongation and tear strength were measured by taking specimens within 25cm from both sides and at the center.

(4) Wrinkle characteristics: According to the sensory test of three artificial leather experts, the degree of wrinkles was evaluated as an average value which was evaluated as being very large, somewhat large or fine (natural).

※ A _L : Longitudinal direction

※ A _C : Width direction

Claims (2)

In artificial leather composed of microfiber bundle and polyurethane elastomer, the fiber bundle is composed of ultrafine bicomponent composite staple fiber composed of nylon and copolyester, and nylon fiber staple fiber having 20 to 80% by weight of the total fiber weight. , Artificial leather for golf uppers, characterized in that the elastic modulus of 120% to 130kg / ㎠ at 100% elongation. The method of claim 1, The length of the nylon fiber staples is 45 ~ 60mm, artificial leather for upper golf shoes, characterized in that the fineness is 1.5 denier or less.