JPS60151387A - Artificial leather - Google Patents

Abstract

PURPOSE:To obtain an artificial leather resembling natural leather, by forming a polyurethane layer containing a pigment on one side of a nonwoven fabric obtained from a mixture containing natural leather powder collagen having a specific particle diameter, short synthetic or rayon fibers, etc. at a specific weight ratio by the sheet formation method. CONSTITUTION:A nonwoven fabric is prepared from a mixture containing pulverized natural leather powder collagen having 30-80 mesh particle size, e.g. cowhide, staple fibers of synthetic fibers, e.g. polyamide or polyester, rayon or pulp, at 90/10-10/90 weight ratio by the usual sheet formation method, and a polyurethane layer containing a pigment is formed on one side of the resultant base fabric. A natural animal pattern or artificial design is cmbossed on the surface of the layer to give the aimed artificial leather having good drapeability and appearance, feeling and material construction resembling those of natural leather.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a new artificial leather, and particularly to an artificial leather similar to natural leather in appearance, feel, and material composition.

Conventionally, artificial leather has been produced by laminating a synthetic resin such as polyurethane on one side of a base fabric such as knitted fabric, woven fabric, or non-woven fabric, and artificial leather in which a synthetic resin layer is laminated on one side after the entire base fabric is impregnated with a synthetic resin solution. is known, but in the former, the back side is just a knitted fabric or non-woven fabric! It is exposed and can be distinguished from natural leather by looking at it, as well as impregnated cloth. 2 was also clearly distinguishable from natural leather in terms of appearance. Furthermore, these artificial leathers lack drapability in terms of texture, and especially those made from knitted fabrics are difficult to cut (cutting diagonally to the surface) when making T-shirts such as bags. Threads often come out due to skidding and spoil the appearance.

As a result of intensive research into creating a base fabric for artificial leather that is similar in appearance and texture to natural leather, the present inventor succeeded in developing a new base fabric that exhibits excellent properties as a base fabric for artificial leather. It was completed.

That is, the present invention is based on one side of a base fabric made of a nonwoven fabric obtained by a papermaking method from a mixture containing 30 to 80 meshes of natural leather powder collagen and synthetic fiber or rayon staples or Parbutoke in a weight ratio of 90/10 to 10/g□. This is a base fabric for artificial leather provided with a polyurethane layer.

The essence of the present invention is to coexist natural leather powder collagen throughout the production of a nonwoven fabric by a papermaking method using synthetic fibers or rayon stable or pulp.

Natural leather powder collagen with a mesh size of 30 to 80 is used, and thereby a base fabric having an appearance and texture similar to natural leather, whether large or small, can be obtained. Is this natural leather powder, for example, cowhide shaving waste? It can be obtained by any suitable method, such as adding moisture and turning it into powder using a pulverizer, or sorting it into a mesh with a constant Fi.

Particularly preferred synthetic fibers are polyamide, polyester, and polyacrylonitrile. Goseisha<fiber, rayon,
Pulp as appropriate, 2f! More than l1? May be used together.

The amount of natural leather powder collagen added is 90/10 to 10/9, preferably 7 to synthetic fiber, rayon or pulp.
The N amount ranges from 0/30 to 30/7o.

As for other conditions of the paper-making method, conditions of well-known paper-making methods are appropriately adopted.

The nonwoven fabric thus obtained is subjected to dyeing processing, etc., if necessary.

A polyurethane layer is provided on one side of the base fabric, which forms the surface of the artificial leather of the present invention.

Application of the polyurethane layer is usually carried out by wet or dry methods.

In the wet method, a polymer solution containing polyurethane distomer as a main component is applied to the surface of the base fabric, immersed in a coagulation bath to coagulate, and then dried.

In the dry method, polyisocyanate and active hydrogen 16
A foamable urethane prepolymer compound containing compound and t?
It is coated on release paper and reacted with the above to form a microporous urethane foam layer. Then, while it is still sticky, it is attached to the base fabric, heated and reacted, and then released with release paper. By peeling it off, or by directly applying the polyurethane-containing composition mixed with air in advance to the base fabric and heating and drying it.Furthermore, instead of applying the polyurethane-containing composition directly to the base fabric, first apply it on a release paper and heat it. A polyurethane layer is provided by drying and adhering to a backing fabric and completely peeling off the release paper.

When applying the polyurethane layer, it is preferable to mix in a pigment of a desired color.

Is there a natural animal pattern or design on the surface of the polyurethane layer (such as a crocodile or oath) on the IJ latch? By applying heat (high frequency or dowsam), pressure contact, and embossing using equipment that transfers onto silicone resin or metal plates, it is possible to create an appearance that closely resembles natural leather.

Appropriate patterns can also be applied using an embossing roll - in this way, artificial leather that loosely approximates natural leather in feel, texture and appearance can be obtained.

Next, an implementation fR according to the present invention will be explained.

(1) Cowskin? The collagen powder was crushed with a crusher to form a collagen powder of 0.000 ml, mixed with 1 denier nylon cut fiber of 4 mm in a ratio of 70/30, and a non-woven fabric was manufactured using a conventional paper making method. Thickness 0.55%, Eye Imma J'380
S'/lt? , width 12 to 1, length 1000m.

Next is polyincyanate and active hydrogen compounds? The foamable urethane prepolymer compounded liquid contained in the mixture is applied onto the release paper,
The above-mentioned two are reacted to form a microporous urethane foam layer. Next is this viscosity? By adhering it to the above-mentioned nonwoven fabric while holding it, causing a heating reaction, and then peeling off the release paper,
I made embossed base leather 7. Release paper used at this time
Well, the surface of the polyrankon made by peeling off with the enamel type has a gloss of enamel 0^1? I have it.

(7) Base Leather - Embossed with a silicone mold made from a replica of Stritch's natural leather using a high frequency mold for 65 seconds at 120C24000Kg/-. The finished ostrich-patterned artificial leather has a moderate luster on the surface of the warts, and the pores, fine wrinkles on the skin, and skin warts are formed exactly like natural leather. In addition, due to the properties of the surface polyurethane, we were able to create a product that has a texture, softness, and touch that are very similar to those of natural leather.

Is the back side collagen 70? It is a non-woven fabric with a texture similar to that of natural leather, and can be scratched diagonally. The bag could be manufactured with the same workability as natural leather.

Although it is made as an attaché case, it has an appearance and feel very similar to natural products, and has good practical functionality.

The physical properties of the polyurethane side of the ostrich pattern were as follows.

(2) Cowskin? Grind it with a crusher to make mesh 50 collagen powder.Mix acrylic 1.2 tensile 4% cut fiber and pulp in a ratio of 50/30/20, and use the paper making method to make a non-woven fabric. Manufactured. Nasty 06
%, area weight 400f/m', width 120cm, length 500
Full. This was beam stained black.

Next, the foamable urethane full polymer compound containing the polyisocyanate and active hydrogen compound is applied onto a release paper, and the two are reacted to form a microporous urethane foam layer.

Next is this viscosity? An embossed base leather was made by pasting the above-mentioned non-woven fabric onto the above-mentioned non-woven fabric, heating and reacting it, and then releasing it with a release paper. The release paper used at this time was an enamel type, and the polyurethane surface created by peeling had an enamel-like gloss.

This Pace Leather Kei is a silicone resin replica made from the natural leather of the crocodile's abdomen, and is layered with copper plating to create a full valve 2! ! ! ke created.

Electrically heated dowsam? Circulate and fully press? f120
It was heated to .degree. C. and stamped at 3000 Ky/m' for 90 seconds. The resulting crocodile-patterned artificial leather has the same luster and pompeii (smooth bulge of crocodile scales) as before French finishing.
The handles of the scales and the small wrinkles in the grooves are formed exactly the same as in nature.

Furthermore, due to the characteristics of the surface polyurethane, a product with a texture, softness, and feel very similar to that of natural M leather was created. The back side is a non-woven fabric containing 50% collagen and has a texture similar to natural leather, with diagonal openings. The bag could be manufactured with the same workability as natural crocodile skin.

Although the handbag is made from grapes, it has an appearance and feel very similar to natural products, and has good practical functionality.

A comparison of various characteristics with natural crocodile is as follows.

[Brief explanation of the drawing]

The figure is a cross-sectional view of the artificial leather according to the present invention. 1 is an ostrich patterned surface, 2 is a polyurethane layer, and 3 is a nonwoven fabric made of a mixture of natural leather powder collagen and synthetic fibers, rayon staples, or pulp. Outgoing MA bundle 1 large company 1+4〉

Claims (4)

[Claims] (1) 30 to 80 mesh of natural leather powder collagen and synthetic fiber modifier or rayon staple or pulp; and 2.
This artificial leather is made by providing a polyurethane layer containing a pigment of a desired color on one side of a base fabric made of a nonwoven fabric obtained by a paper-making method from a mixture containing a weight ratio of 90/1g to 1o/9o. (2) The artificial leather according to claim 1, wherein the synthetic fiber is polyamide, polyester, polyacrylonitrile, polypropylene, or vinylon. (3) The artificial leather according to claim 1, which has a natural animal pattern or an artificial design embossed on the surface of the polyurethane layer. (4) The artificial leather according to claim 1, wherein the polyurethane layer on the enamel surface is embossed with a pattern with large irregularities such as an ostrich pattern to leave a full gloss on the convex portions.