JP3076933B2 - Suede-like fabric - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suede-like fabric comprising a brushed knitted fabric having ultra-fine fiber naps and a high molecular elastic material, which is excellent in abrasion strength and excellent in air permeability and flexibility.

[0002]

2. Description of the Related Art A suede-like fabric obtained by impregnating a brushed knitted woven fabric having ultrafine fiber nap with a polymer elastic material has been known. The purpose of impregnating the polymer elastic body is to improve the wear strength and obtain a leather-like appearance and feeling,
As the applying method, a coating method, a method of squeezing with two rolls made of rubber or metal after dipping and impregnation, and the like are known (Japanese Patent Application Laid-Open No. 52-143203, Japanese Patent Publication No. Sho 53-12).
No. 565). In the suede-like fabric obtained by these methods, the polymer elastic body adheres to the base fabric layer of the knitted fabric, and the structure of the knitted fabric is restrained by inter-fiber adhesion of the base fabric layer,
When the impregnation amount of the polymer elastic body is increased and the wear strength is improved, flexibility and air permeability are lacked, and when the impregnation amount is reduced and the flexibility is improved, the wear strength is reduced. That is, there was no suede-like fabric composed of a raised knitted fabric having ultrafine fiber nap having high abrasion strength, flexibility, and air permeability, and a polymer elastic material.

The object of the present invention is to remedy these disadvantages of the prior art, to provide a high degree of wear strength, good air permeability and flexibility.
An object of the present invention is to provide a suede-like fabric comprising a brushed knitted fabric having ultrafine fiber nap and a polymer elastic body.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a suede-like fabric comprising a brushed knitted fabric having ultrafine fiber napping and a polymer elastic material, comprising a napping layer having napping fibers exposed from the surface, a napping fiber and It consists of an intermediate layer of a porous structure in which molecular elastic bodies are entangled and a layer of a knitted fabric base fabric for raising.The intermediate layer of the porous structure is a gas-permeable layer mainly composed of open cells, and is composed of fibers. The entangled bond is fixed mainly in the form of a horizontal nap, not in the vertical nap direction of the fiber, and furthermore, the base cloth layer has a structure substantially free of a polymer elastic body and having no inter-fiber adhesion. A suede-like fabric having excellent wear strength and excellent flexibility and breathability.

FIG. 1 shows a cross-sectional electron micrograph of the suede-like fabric according to the present invention. For reference, a cross-sectional electron micrograph of a commercially available suede-like fabric is shown in FIG. As is clear from these photographs, the conventional suede-like fabric has a polymer elastic body attached and impregnated up to the base fabric layer, whereas the suede-like fabric of the present invention has a raised layer, a porous layer, and a base fabric layer. Is clear, and the base fabric layer does not include an elastic body.

Hereinafter, the present invention will be described more specifically. The ultrafine fibers used in the present invention are those obtained from a direct spun fiber peelable conjugate fiber, a sea-island type polymer mutual array fiber, and the fineness thereof is 0.8 denier or less, preferably 0.3 denier or less.
It is less than denier. If it exceeds 0.8 denier, abrasion strength can be easily obtained, but the hand is coarse and hard, and a preferable fabric cannot be obtained.

As the polymer elastic body, a polyurethane-based material well known in this field is used. These polymer elastic bodies are formed into a porous film by a wet method. As the polyurethane solution used for the wet method, polyurethane is N-
A solution dissolved in a solvent such as N'-dimethylformamide (DMF), N-N'-dimethylacetamide (DMAC), or tetrahydrofuran is used. Various additives such as a pigment, an antioxidant, an ultraviolet absorber, a surfactant, and a pore regulator can be added to the polyurethane solution.
It is preferable to select a urethane solution containing various additives having a urethane solid concentration of 7 to 15% and a viscosity of 100 to 10,000 centipoise in order to satisfy high wear strength, flexibility and air permeability. .

When the urethane solution is applied and impregnated,
It is important that the raised knitted fabric is appropriately treated with water or an aqueous solution in which a water-soluble solvent is previously dissolved. As the water-soluble solvent, DMF, DMAC, methanol, ethanol, isopropanol and the like can be used. As a method of applying water or an aqueous solution thereof to the raised knitted fabric, a method of immersing in water or an aqueous solution followed by squeezing with a vacuum dehydrator or a roll. Alternatively, a method of coating the back surface of the raised knitted fabric by a method such as gravure coating, reverse roll coating, or kiss roll coating is preferable.

In the present invention, by applying a urethane solution having an appropriate concentration to the knitted knitted fabric to which water or a water-soluble solvent aqueous solution has been appropriately applied in advance in this manner, the coated urethane solution is previously coated. When the urethane solution provided to the substrate comes into contact with water or an aqueous solution having a function as a coagulant, the coagulation is started, and as a result, the urethane solution is prevented from penetrating into the base fabric layer.

The type and concentration of water or water-soluble solvent to be applied in advance and the amount of impregnation or application to the raised knitted fabric can be appropriately determined depending on the degree of penetration of the urethane solution used into the raised knitted fabric.

As a method of applying and impregnating the urethane solution, any known method such as knife coating and reverse roll coating can be used.

After the urethane solution is applied, the urethane solution is brought into contact with a coagulant according to a conventional method to coagulate. As the coagulant, water, methanol, ethanol or an aqueous solution mainly containing water is used. The wet coagulated sheet obtained by such a method is very flexible. However, since the fibers are not exposed in a rubber-like state when wet coagulation is completed, the fibers are exposed and napped by performing a grinding process using sandpaper or the like.

As a result, the raised layer where the raised fibers are exposed,
A porous intermediate layer in which the raised fibers and the continuous foam layer of the polymer elastic body are entangled, and a raised knitted fabric base fabric layer substantially free of the polymer elastic body and having no inter-fiber adhesion, and the intermediate layer The entangled bonding of the fibers of the above gives a suede-like fabric which is fixed mainly in the form of horizontal naps, not in the vertical napping direction.

[0014] The suede-like fabric of the present invention has the above-mentioned structural characteristics, and as a result, has excellent wear strength and excellent flexibility and air permeability.

Next, examples relating to the suede-like fabric of the present invention and a method for producing the same will be described, but the present invention is not limited to or limited to these examples.

Example 1 A raised fabric is made of a mixed nap of a polyester and a polyamide having an average fineness of 0.3 denier, and a ground texture is composed of 24 polyesters of 75 denier.
/ M ² tricot brushed product was used. About 10 of the following composition
% Solids urethane solution was prepared. At that time, the viscosity was about 350 cps. Mp812 (Ester urethane made by Dainippon Ink) 100 parts by weight Pigment 10 ASSISTOR SD-11 (Pore adjuster made by Dainippon Ink) 1 ASSISTOR SD-7 (Pore adjuster made by Dainippon Ink) 1 DMF 200

After immersing the brushed fabric in a 30% DMF aqueous solution,
The nip roller was used to adjust the amount of adhesion to 60% of the weight of the drawn base fabric. Thereafter, the previously prepared urethane solution was applied to a 800 g / m ² fluff surface with a knife coater, immediately solidified in water, sufficiently desolvated in hot water, and dried.
The coated surface was buffed with # 240 sandpaper until the fibers were exposed. The suede-like fabric obtained in this manner contains no polymer elastic body at all in the base fabric and only adheres to the root of the nap portion, and as shown in Table 1, has a high degree of wear strength and flexibility. It was excellent in air permeability. FIG. 1 shows an electron micrograph of the suede-like fabric. As shown in FIG. 1, there was no polymer elastic body in the base cloth, and the urethane intermediate layer was composed of open cells, and the entangled bonds of the fibers in the urethane intermediate layer were mainly fixed in the form of horizontal naps.

Example 2 The same brushed fabric as in Example 1 was coated on the back with 60 g / m ² of water using a gravure coater, and the urethane solution prepared in Example 1 was coated with 800 g / m ² using a knife coater. The coating was applied to the fluff surface (surface), and the same treatment as in Example 1 was performed. The suede-like fabric thus obtained is shown in Table 1.
As shown in the figure, it was excellent in high wear strength, air permeability, and flexibility. The structure was similar to that of Example 1.

Comparative Example 1 The brushed fabric used in Example 1 was coated with the urethane solution prepared in Example 1 at 800 g / m ² on a fluff surface, and the same treatment as in Example 1 was performed. The suede-like fabric obtained in this manner had urethane penetrating into the ground structure and lacked flexibility and air permeability as shown in Table 1.

Comparative Example 2 A urethane solution of about 5% solids having the following composition was prepared. Mp812 100 parts by weight Pigment 10 ASSIST0R 1 ASSIST0R 1 DMF 500

The brushed fabric used in Example 1 was coated with the previously adjusted urethane solution of about 5% solids at 800 g / m ² , and the same treatment as in Example 1 was performed. The suede-like fabric thus obtained was soft, but was inferior in wear strength and air permeability as compared with Examples 1 and 2.

Comparative Example 3 The brushed fabric used in Example 1 was replaced with 30%
After being immersed in the DMF aqueous solution, the weight was adjusted with two nip rollers to an adhesion amount of 60% of the weight of the base fabric. Thereafter, the urethane solution prepared in Comparative Example 2 was applied to the fluffed surface with a knife coater for 80 minutes.
After coating at 0 g / m ^2, the same treatment as in Example 1 was performed. The suede-like fabric thus obtained was soft and excellent in air permeability as shown in Table 1, but was poor in abrasion strength.

[0023]

[Table 1]

[Brief description of the drawings]

FIG. 1 is an electron micrograph showing a fiber shape in a cross section of a suede-like fabric of the present invention.

FIG. 2 is an electron micrograph showing a fiber shape of a cross section of a commercially available suede-like fabric.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields investigated (Int. Cl. ⁷ , DB name) D06N 3/00-3/18 B32B 5/24 D04B 35/36 D03D 25/00 D06C 11/00

Claims (1)

(57) [Claims] In a suede-like fabric comprising a brushed knitted fabric having ultrafine fiber napping and a polymer elastic body, a nap layer in which the napping fiber is exposed from the surface, and the napping fiber and the polymer elastic body are entangled and bonded. The intermediate layer having a porous structure and the layer comprising a knitted fabric base fabric for raising are provided, and the intermediate layer having a porous structure is a gas-permeable layer mainly composed of open cells, and the entanglement of the fibers is in the vertical napping direction of the fibers. However, the base fabric layer is characterized in that the base fabric layer is substantially free of elastic polymer and has no structure between fibers. Suede-like fabric with excellent wear strength and excellent flexibility and breathability.