JP2002180380A - Sueded artificial leather and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sueded artificial leather having a high level of abrasion resistance performances, a soft touch feeling and an elegant appearance. SOLUTION: This sueded artificial leather is a sheet comprising a raised ultrafine fiber layer continuous to ultrafine fibers of a fibrous substrate layer on the surface of the fibrous substrate layer composed of a three-dimensional entangled nonwoven fabric comprising the ultrafine fibers having <=0.5 dtex single fiber fineness and a porous structure of an elastic polymer present in entanglement spaces thereof and further a silicone compound having >=50,000 molecular weight in an amount of 0.5-5 wt.% based on the sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suede-like artificial leather having good appearance and high abrasion resistance and a method for producing the same. More specifically, by having high abrasion resistance performance, sports shoes, furniture,
The present invention relates to a suede-like artificial leather that can be suitably used in application fields requiring a high degree of wear resistance such as car seats.

[0002]

2. Description of the Related Art It is widely known that artificial leather can be obtained by impregnating a fiber sheet mainly composed of ultrafine fibers with an elastic polymer, and a suede-like artificial leather obtained by shaving the surface thereof. Leather is widely used not only in the field of clothing such as coats, skirts and jackets, but also in the field of non-clothing such as shoes, bags, furniture and car seats. These suede-like artificial leathers need to use fibers having a single fiber thickness of 0.5 decitex or less in order to make the surface thereof have a luxurious feeling and a lighting effect similar to that of natural leather. As the material of the ultrafine fibers, polyesters represented by polyethylene terephthalate, polyamides such as nylon 6 and nylon 66, and polyacrylonitrile are suitably used. However, due to the fineness of the ultrafine fibers of 0.5 decitex or less, there is a disadvantage that the abrasion resistance is poor.

[0003] In particular, when used for applications where abrasion is applied to surfaces such as sports use and interior fields such as furniture and car seats, and when used for such a long time, the abrasion resistance performance is reduced. It becomes a problem, and the fluff on the surface falls off and becomes shiny and bald. As a method for solving such a problem, for example, JP-A-5-78986 discloses an average fiber diameter of 0.1 obtained by a melt blow method.
When impregnating a non-woven fabric consisting of fibers of up to 6 μm with a polymer elastic body, a larger amount is applied to the surface layer side than the back layer side to enhance the gripping force of the ultrafine fibers on the surface, and a nubuck tone excellent in abrasion resistance is provided. A method for obtaining artificial leather is disclosed. However, in the case of this method, since the ultrafine fibers and the elastic polymer are firmly adhered to each other, it is difficult to obtain a soft texture.

[0004] As an improvement method, Japanese Patent Publication No.
JP-A-16235 and JP-A-6-330473 disclose a method of impregnating and applying an elastic polymer to a fiber layer composed of ultrafine fibers in two stages. However, this method also has the drawback that the adhesion between the microfibers and the elastic polymer is strengthened and the detachment of the fibers is controlled to some extent, but the feel becomes hard. Also, there is a problem that if the amount of the applied polymer elastic material is reduced in order to obtain a soft texture, the abrasion resistance performance is reduced. In addition, Tokiko Sho 6
Japanese Patent Application No. 0-56832 proposes a method of applying silicone and paraffin to a fiber nap sheet for the purpose of improving sewing workability and dyeing fastness. However, in the case of the silicone used for such a purpose, although the sewing workability and the color fastness to rubbing can be improved, a material having a high abrasion resistance cannot be obtained by this method. As described above, the conventional suede-like artificial leather has a luxurious surface quality and a soft texture, and can withstand long-term use in the fields of sports shoes, furniture, car seats, and the like. It is hard to say that it has sufficient wear resistance.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a high-quality appearance, flexibility and a fulfilling feel while using it in the fields of sports use, furniture, car seats and the like. An object of the present invention is to provide a suede-like artificial leather having high abrasion resistance.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, have found that a three-dimensional entangled nonwoven fabric made of ultrafine fibers having a single fiber fineness of 0.5 decitex or less and an entangled space thereof are provided. A sheet having a microfiber nap layer continuous with microfibers of the base layer on the surface of a fibrous base layer composed of a porous structure of an elastic polymer present in the silicon layer having a molecular weight of 50,000 or more. It has been found that the above object can be achieved by a suede-like artificial leather in which the system compound is contained in an amount of 0.5 to 5% by weight based on the fibrous base material.

[0007] Preferably, the three-dimensional entangled nonwoven fabric is composed of an ultrafine fiber bundle in which 100 to 400 ultrafine fibers having a single fiber fineness of 0.005 to 0.02 decitex are bundled. Particularly preferably, the non-woven fabric is formed in a state in which the fibers constituting the artificial leather form a bundle, and the elastic polymer and the silicon compound are contained between the fiber bundles. This is the case where a silicon compound is also provided inside.

[0008] As a preferred method for producing such a suede-like artificial leather, the following steps (1) to (8) are sequentially performed. However, regarding the steps (6) to (8), their order may be changed or they may be performed simultaneously. (1) a step of forming an ultrafine fiber-generating fiber staple that generates ultrafine fibers of 0.5 decitex or less into a web;
(2) laminating webs and performing needle punching to form a nonwoven fabric having a delamination strength of 2 kg / 2.5 cm or more;
(3) a step of pressing the needle-punched nonwoven fabric;
(4) a step of impregnating a polymer elastic body solution or dispersion to solidify the polymer elastic body, (5) a step of generating microfibers from microfiber-generating fibers, and (6) a fibrous basic surface obtained. (7) dyeing a fibrous substrate, (8) applying a silicon-based compound having a molecular weight of 50,000 or more to the fibrous substrate in an amount of 0.5 to 5% by weight,

Hereinafter, the present invention will be described in detail. First, the fibrous base material used in the present invention is an ultrafine fiber having a single fiber fineness of 0.5 dtex or less, preferably 0.2 dtex or less and 0.001 dtex or more, more preferably a single fiber fineness of 0.05 dtex or less. It is a fibrous base layer having a smooth surface made of a three-dimensional entangled nonwoven fabric made of a bundle of ultrafine fibers of 0.005 dtex or more and an elastic polymer present between the fiber bundles but not present in the fiber bundle. A bundle of ultrafine fibers having a single fiber fineness of 0.5 decitex or less is produced by a conventionally known method. For example, at least one component is formed from ultrafine fiber-generating fibers composed of at least two types of incompatible polymers, wherein at least one type of polymer is an island component in the cross section and at least one other type of polymer is a sea component. (Usually a sea component polymer) by mechanical or chemical treatment by dissolving or decomposing and removing, or mechanically or chemically bonded laminating ultrafine fiber generating fiber having a cross-sectional shape in which two or more incompatible polymers are bonded. By exfoliating at the interface between the two components. In order to set the single fiber fineness of the ultrafine fibers constituting the bundle of the obtained ultrafine fibers to 0.5 decitex or less, particularly to 0.2 decitex or less, the fiber cross section is smaller than that of the bonded type ultrafine fiber generation type fiber. It is more advantageous in the process to use the ultrafine fiber generating type fiber having the sea-island structure. Further, a method for directly producing ultrafine fibers such as a melt blown may be used. 1.0 as the total thickness of the fiber bundle
~ 5.0 dtex is preferred.

In particular, in the present invention, the fine fibers having a sea-island structure in which the number of islands in the fiber cross section is 100 to 400 and the fineness of the ultrafine fibers formed by removing the sea component polymer is 0.005 to 0 When it is formed from a fiber base layer composed of ultrafine fiber bundles of .02 decitex, the silicon-based compound present in these ultrafine fiber bundles works most effectively, and the nap is substantially reduced. This is most preferable because the suede feeling is not impaired by being bundled into a bundle and the ultrafine fibers in the ultrafine fiber bundle are not integrated so as to impair the flexibility, and the object of the present invention is remarkably exhibited.

Preferable examples of the polymer constituting the ultrafine fibers in the ultrafine fiber generating fibers include polyamides such as 6-nylon and 66-nylon which can be melt-spun, polyethylene terephthalate, polybutylene terephthalate, cationic dyeing. At least one type of polymer selected from melt-spinnable polyesters such as type-modified polyethylene terephthalate is exemplified.

The component to be dissolved or decomposed and removed is a polymer having a difference in solubility or decomposability with respect to a solvent or a decomposing agent from the microfiber component and low compatibility with the microfiber component, and under spinning conditions. It is a polymer having a lower melt viscosity or a lower surface tension than the ultrafine fiber component, and is, for example, at least one polymer selected from polymers such as polyethylene, polystyrene, polyethylene propylene copolymer, and modified polyester.

After crimping the microfine fiber-generating fiber, the fiber is cut into a predetermined length, defibrated with a card, and formed into a web through a webber. The obtained fiber web is laminated to a desired weight and thickness, and then subjected to an entanglement treatment by a known method such as needle punching or high-speed water flow to obtain a three-dimensional entangled nonwoven fabric. A woven or knitted fabric can be laminated on the web as needed. Since the surface of the three-dimensional entangled nonwoven fabric is finally fuzzed and the raised surface is formed, it is necessary that the nonwoven fabric surface is composed of ultrafine fiber-generating fibers or ultrafine fibers. From the viewpoint of the texture of the obtained sheet, it is preferable that the entire nonwoven fabric is made of ultrafine fiber-generating fibers or ultrafine fibers.

In the present invention, in order to satisfy the abrasion resistance to a higher degree, it is preferable to first strengthen the entanglement of the fibers in the nonwoven fabric stage. Specifically, it is preferable to perform the needle punching treatment until the delamination strength of the nonwoven fabric, which is a measure of the entangled state of the fibers, becomes 2.0 kg / 2.5 cm or more. The delamination strength of the nonwoven fabric is a physical property value for measuring the entangled state of the nonwoven fabric, which is an intermediate product in the present invention, and the measurement method is described in the column of [Method of measuring delamination of nonwoven fabric] described later. There is a clear correlation between the delamination strength of the non-woven fabric and the artificial leather substrate and the abrasion resistance performance. By performing needle punching until the delamination strength of the non-woven fabric becomes 2 kg / 2.5 cm or more, the adhesion and peeling strength of the product is improved. It can be made more advanced, and after generating ultrafine fibers from the ultrafine fiber-generating fibers described below, by using in combination with the addition of a silicon-based compound, a suede tone having a high abrasion resistance of the present invention. Artificial leather can be made more sophisticated.

In order to adjust the delamination strength after entanglement of the nonwoven fabric made of ultrafine fiber-generating fibers to 2 kg / 2.5 cm or more, it is possible to apply an oil agent such as silicon to the fibers. The types of oil agents include polyorganosiloxane and various modified silicone oil agents that have the effect of reducing friction between fibers, and mineral oil oil agents that have the effect of increasing the friction between metals by combining fibers. ,
In addition, an oil agent such as an antistatic agent is blended and applied in consideration of the characteristics of the fiber. The step of applying may be before or after crimping of each fiber, but as described later, in the present invention, it is preferable to apply after crimping.

In the present invention, the delamination strength of the nonwoven fabric after entanglement is preferably 2.0 kg / 2.5 cm or more. 2.0
When the weight is less than kg / 2.5 cm, the adhesive peel strength of the product does not become an extremely high value. As a result, in the case of the use form, fluffing occurs during friction, causing baldness and shine and impairing the suede feeling. It is easy to be. More preferably, it is 4 to 6 kg / 2.5 cm. 6kg / 2.5cm
If it exceeds, remarkable improvement of friction performance can no longer be obtained, and if you forcibly strengthen entanglement with needle punch,
Conversely, the surface smoothness of the nonwoven fabric is impaired.

As the felt needle of the needle punch in the present invention, a well-known one is used. However, for sewing in the thickness direction of the web, a one-barb needle which does not easily break the fiber is preferably used. In order to increase the specific gravity of the surface of the nonwoven fabric, a multi-barb needle such as 3 barbs, 6 barbs, and 9 barbs can be used. These needles may be combined depending on the purpose.

The number of punches in the needle punching step depends on the shape of the needle to be used and the thickness of the web.
It is set in the range of 00 to 2500 punches / cm ² . In general, in needle punching of microfiber-generating fiber, if the needle punching conditions are too strong, cutting or fiber cracking of microfiber-generating fiber occurs, and entanglement does not improve,
On the other hand, if the needle punching conditions are too weak, the number of fibers arranged in the thickness direction becomes insufficient, and the entanglement does not improve. In order to enhance the delamination strength of the nonwoven fabric, the crimped state of the fiber and the oil composition applied to the fiber are important, and the crimped state depends on the structure and polymer type of the fiber, such as fiber cracking. Since there is an appropriate state where no trouble occurs, after determining the crimped state, delamination of the nonwoven fabric is 2 kg / 2.5 cm.
In order to achieve the above, it is preferable to provide a suitable oil composition. In particular, microfiber-generating fibers are prone to problems such as wrapping and fiber breakage in the card and needle processes,
In order to prevent this, facilitate the movement of the fiber at the time of the needle, and facilitate the entanglement of the fiber, it is preferable to focus on the oil agent that reduces the friction coefficient of the fiber. By doing so, these troubles can be minimized, needle punching can be performed most efficiently, and conditions for obtaining a nonwoven fabric with highly entangled fibers can be found. As the amount of the oil agent to be applied to the microfiber-generating fiber,
0.1 to 1% by weight based on the fiber is preferred. The thickness of the ultrafine fiber-generating fiber is preferably from 1 to 15 dtex.

The needle-punched nonwoven fabric is then pressed in the thickness direction to smooth the surface and regulate the thickness. The method of pressing is a method of passing between multiple heating rolls,
Conventionally known methods such as a method of passing a preheated nonwoven fabric between cooling rolls can be used, and the surface smoothness of the nonwoven fabric can be further smoothed by melting and pressing a sea component in the fiber, that is, a low melt viscosity component such as polyethylene. I can do it. The surface smoothness of the nonwoven fabric affects the surface smoothness of the product, and the surface smoothness of the product is important for reducing the frictional resistance of the surface and maintaining a high-quality suede feeling on the surface. During this step, an adhesive such as polyvinyl alcohol, starch, or a resin emulsion may be applied for the purpose of suppressing a morphological change in the step due to tension, pressing, or the like, and removal may be performed after the elastic polymer is applied. . As the basis weight of the three-dimensional entangled nonwoven fabric, the weight after the ultrafine fiber-generating fiber was ultrafine was 10
0 to 1500 g / m ² is preferred.

The nonwoven fabric having a smooth surface is then impregnated with a solution or dispersion of an elastic polymer, and solidified into a porous structure. Examples of the method of coagulating the elastic polymer include a method of wet coagulation by dipping in a liquid containing a non-solvent of the elastic polymer, and a method of heating and drying after gelation. As the elastic polymer to be impregnated here, for example, polyurethane, synthetic rubber, acrylate-based polymer or copolymer conventionally used in the production of a leather-like sheet, a resin elasticized by using a plasticizer, for example, A polymer mainly composed of at least one kind of elastic polymer selected from elastic polymers such as polyvinyl chloride and polyamide can be used. However, polyurethane is most preferably used because of its flexibility, elastic recovery, sponge-forming property and the like.

As the polyurethane, for example, at least one kind of polymer diol selected from polyester diols having an average molecular weight of 500 to 3,000, polyether diols, polymer diols such as polycarbonate diols and polyester polyether diols, and the like;
At least one diisocyanate compound selected from aromatic, alicyclic, and aliphatic diisocyanates such as 4,4'-diphenylmethane diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate; ethylene glycol; butanediol;
Polyurethane obtained by reacting at least one kind of low-molecular compound having two or more active hydrogen atoms such as ethylenediamine, 4,4′-diaminodiphenylmethane, N-methyldiethanolamine and the like at a predetermined molar ratio and a modified product thereof are obtained. No.

A coloring agent, if necessary, may be added to the elastic polymer liquid.
Additives such as a coagulation regulator, an antioxidant, and a dispersant are blended. The proportion of elastomeric polymer in the fibrous base gives the base a soft feel and elastic recovery, and most importantly, forms a highly smooth base surface prior to applying the resin to the raised surface. For this reason, it is preferred that the solid content be 10% or more, preferably 30 to 50% by weight before solidification. When the ratio of the elastic polymer is less than 10%, the adhesion between the ultrafine fibers and the elastic polymer is insufficient, so that the ultrafine fibers cannot be sufficiently fixed when raising the surface of the substrate, and the elastic sponge itself is dense. The raised surface does not become a sufficiently smooth surface because the surface is not smooth. Also, if it exceeds 50%, the texture becomes hard, which is not preferable.

Next, the ultrafine fiber-generating fiber is treated with at least one component (preferably, a sea component constituting polymer) of the fiber constituting polymer with a dissolving agent or a decomposing agent, or by mechanical or chemical treatment. It exfoliates at the interface of the components and is transformed into an ultrafine fiber bundle. The modification treatment of the ultrafine fiber-generating fiber may be before the application of the elastic polymer.However, when the ultrafine fiber bundle is impregnated with the elastic polymer after the modification, and solidified, the elastic polymer adheres to the ultrafine fiber and the texture becomes hard. It is preferable to modify the fiber bundle into an ultrafine fiber bundle after applying the elastic polymer. In the case where the modification treatment is performed before the elastic polymer is applied, the elastic polymerization is applied after the temporary filler capable of being dissolved and removed, such as polyvinyl alcohol, is applied to the nonwoven fabric so that the ultrafine fibers and the elastic polymer do not adhere to each other. It is preferable to remove the temporary filler.

The fibrous base layer made of the three-dimensional entangled nonwoven fabric and the elastic polymer obtained as described above is subjected to a brushing treatment on the surface, and has a smooth nap having nap made of ultrafine fibers having a single fiber fineness of 0.5 decitex or less. Form a surface. As a brushing method,
Raising with a needle cloth raising machine is also used, but buffing with sandpaper or the like is more preferably performed because delicate and uniform raising is possible. The single fiber fineness of the microfiber naps is 0.5 dtex or less, preferably 0.1 dtex or less. If it is thicker than 0.5 decitex,
Suede-like dignified appearance of natural leather cannot be obtained.

Next, the obtained suede-like fibrous base material is dyed. The dyeing is carried out using a dye mainly composed of an acid dye, a metal complex salt dye, a disperse dye or the like according to the type of the fiber.
Dyeing is performed by a usual dyeing method. The dyed suede-like fibrous base material is subjected to finishing treatments such as fir, softening, and brushing to obtain a suede-like appearance.

Next, a silicon-based compound is applied to the suede-like artificial leather thus obtained, and examples of the silicon-based compound include compounds represented by the general formula (1).

[0027]

(Equation 1)

Preferred specific examples thereof include dimethyl silicon, methyl phenyl silicon, methyl hydrogen silicon, amino-modified silicon, epoxy-modified silicon, alkyl-modified silicon, and silicon polyether copolymer. The silicon-based compound used does not limit the kind of the compound itself. However, its molecular weight needs to be 50,000 or more. Preferably it is 70,000-500,000. When the molecular weight is less than 50,000, it is uniformly blended into the substrate layer and has a smoothing effect, but the oil film is weak, so that the abrasion resistance does not improve. Those having a molecular weight of more than 500,000 have a high viscosity, are difficult to uniformly conform to the base layer, and are not smooth, so that not only the abrasion resistance is not improved, but also the fluff on the surface is partially collected, and The feeling is bad. More preferably, 80,000 to 300,000
Having a molecular weight in the range of Conventionally, in order to make artificial leather flexible, a method of applying a silicone softening agent to artificial leather has been used. However, a silicon compound applied for such a purpose has an average molecular weight of 10%. ,
It is around 000, and has a significantly different average molecular weight from that used in the present invention.

In the present invention, the above-mentioned artificial suede leather is impregnated with a silicon compound as an aqueous dispersion. In that case, the silicon-based compound may be used alone, or may be used in combination with additives such as a penetrant and an antioxidant.
In addition to the method of applying the silicon-based compound as an aqueous dispersion to the leather-like sheet after dyeing as described above, the method of kneading the silicon-based compound into a fiber or a polyurethane resin for impregnation, or a dyeing liquor at the time of dyeing as post-processing. There is also a method of adding and attaching to the inside. Among these methods, in the present invention, a method of applying a silicon-based compound by a post-processing method at the time of dyeing or after dyeing because the silicon-based compound can easily penetrate into and between the ultrafine fiber bundles and into the inside of the fiber bundle. Is preferred.

[0030] The amount of adhesion is 0.1 to the fibrous substrate.
5 to 5.0% by weight is used, preferably 1 to 3% by weight.
It is. If the content is less than 0.5% by weight, the target surface wear resistance is not exhibited, and if the content exceeds 5.0% by weight, the effect is not further improved, and the feeling of stickiness of the texture is rather increased.
It is not preferable because the napped portion on the surface gathers hair and deteriorates the appearance.

The suede-like artificial leather of the present invention has an excellent performance of an adhesive peel strength of 7 kg / 2.5 cm or more, and can be used for various applications. In particular, the surface has abrasion resistance. It is suitable for use in the field of application that is required to be used, for example, as an upper material for sports shoes, seats for furniture, automobile seats, aircraft seats, and the like.

In the present invention, the following method was used to evaluate the wear resistance. [Method for Evaluating Abrasion Resistance Performance] Test method: Measured by the 6.17.1 abrasion strength method of the general textile property test method (JIS L1096). (Universal type method) Five test pieces having a diameter of about 12 cm were sampled from a sample, placed on a rubber film, and the number of times the test piece was broken with abrasive paper (# 320) was measured. The average value of five times Indicated by Friction speed is 1
123 times ± 5 times per minute, and the pressing load was 4.45N. The test piece was rotated once for 100 times of friction. Air pressure is 2.76 × 10 ⁴ Pa (0.281 kgf
/ Cm ² ).

[Molecular weight of silicon-based compound] The silicon-based compound was concentrated to make only the pure content, and measured by GPC. [Measurement method for delamination strength of nonwoven fabric] Cut the nonwoven fabric in the vertical direction (sheet length direction) by 23 cm and 2.5 cm in width, make a cut in the middle of the thickness with a razor blade or the like, and hand-cut about 10 cm in length. Peel off. Both ends of the peeled portion are sandwiched between chucks, and the peel strength is measured and recorded at a tensile speed of 100 mm / min by a tensile tester. From the obtained SS curve, the average value of the flat portion of the peel strength is determined. It is represented by the average value of three test pieces.

[Method of Measuring Adhesive Peel Strength of Artificial Leather Substrate]
The adhesive was evenly applied to a 2.5 cm wide rubber plate whose surface was shaved and heat treated at 100 ° C. for 2 minutes.
A test piece having a width of 2.5 cm is attached. The bonded test pieces were pressed at a pressure of 2 to 4 kg / cm2, and
Leave day and night. The tip of the rubber plate of the bonded test piece is sandwiched between one chuck and the tip of the sample is sandwiched between the other chucks. The peel strength between the rubber plate and the sample adhesion portion is measured and recorded at a speed of 100 mm / min using a tensile tester. Obtained S
The average value of the flat portion of the peel strength is determined from the S curve. It is represented by the average value of three test pieces.

[0035]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto.
In the examples,% is a value based on weight unless otherwise specified. In addition, the fineness of the ultrafine fibers referred to in the present invention was obtained by taking a cross section of the fiber with an electron microscope, calculating the average value of the cross-sectional area of 50 ultrafine fibers arbitrarily selected from the photograph, and calculating the fineness from the average value.

Example 1 An apparatus for producing a multi-component fiber in which a polymer stream melted by two extruder melting systems is joined at a spinning head, and a mixed stream is formed by a static mixing method in which division and integration are repeated to be melt-spun. Is used, the island component is 6-nylon, and the sea component is high-flowability low-density polyethylene (sea component / island component ratio = 50
/ 50) was spun. The obtained fiber was drawn, crimped, and cut to obtain a staple fiber having a cut length of 5.4 decitex and a cut length of 51 mm.

The microfiber-generating fiber thus obtained
Staple of Wei (6-nylon is island component and microfiber component)
0.5% by weight of silicone oil to solid fiber
Oh, pass this staple through the card,
The web was formed by the formula and laminated. Next, attach one needle to the needle.
1200 punches / cm using felted needles
^TwoPunch with a needle piercing density of 800g / m^Two
Was obtained. The delamination strength of this non-woven fabric is 4.2k
g / 2.5 cm. Heat treatment of this nonwoven fabric at 140 ° C
And the sea component polyethylene is in a softened state,
Pressed to smooth the surface, and 3.2mm thick non-woven fabric
did.

The entangled nonwoven fabric was impregnated with a dimethylformamide solution of a polyether polyurethane, and then poured into a 30% by weight aqueous solution of dimethylformamide to perform wet coagulation. Subsequently, the fiber was treated in hot toluene to extract and remove the polyethylene component in the fiber to obtain a sheet having a thickness of 2.4 mm. This sheet was sliced and divided into two, and the divided surface was buffed with sandpaper to adjust the thickness to 1.0 mm. Further, the surface at the time of coagulation was treated with an emery buffing machine to form a fiber napped surface. The thickness of the ultrafine fibers constituting this sheet (fiber base material) was 0.013 dtex.

The sheet having the fiber raised surface was used as a dye by Irgalan Brown 2BLN (Chiba).
Geigy) at a concentration of 5% owf. The suede-like artificial leather obtained by finishing had a vividly dyed and good texture. The obtained suede-like artificial leather has a weight ratio of fiber to polyurethane of 6%.
0:40 and the basis weight was 300 g / m ² .

The suede-finished leather-like sheet has a molecular weight of 10
Dip and nip treatment of a 1.5% aqueous solution of dimethyl silicone of 0.000 as a solid content to make the impregnation rate 70%, and a solid content of 1.05% based on suede-like artificial leather
Granted. The obtained suede-finished leather-like sheet was inspected with an emission spectrometer (manufactured by Jarrell Ash Co.) to confirm that 1.0% of dimethyl silicone was added to the fiber base material. When the adhesive peel strength of this product was measured, it was 9.5 kg / 2.5 cm. The abrasion resistance of this suede-like leather-like sheet was improved to 2,200 times from the untreated product of 600 times, and a good suede-like artificial leather having good texture and appearance as before treatment was obtained. In this suede-like artificial leather, it was confirmed by coloring dimethyl silicon that dimethyl silicon had permeated between the ultrafine fiber bundles and into the ultrafine fiber bundles.

When sports shoes were manufactured using this suede-like artificial leather as the upper so that the suede surface was on the outside, the surface of the shoes was rubbed violently by the ground, balls, shoes of others, etc. It was extremely excellent in wear resistance. When the suede-like artificial leather was used for the upholstery of an office chair so that the suede surface was on the outside, the wear of the fiber on the surface was hardly observed despite the prolonged use every day for 6 months. Did not.

Comparative Example 1 The suede-like artificial leather-like sheet of Example 1 had a molecular weight of 10
An aqueous solution of dimethylsilicon of 000 was subjected to a dip-nip treatment to give 0.1% by weight and 10.0% by weight of the solid content to the fiber substrate. The adhesive peel strength of this product was 9.5 kg / 2.5 as in Example 1.
cm, but with 0.1% by weight of dimethylsilicone, the texture and appearance were as good as those before the treatment, and the artificial leather was good, but the abrasion resistance was untreated.
650 times compared to 00 times, almost no improvement was observed. In the case of 10% by weight, the abrasion resistance was improved to 2800 times compared to 600 times of the untreated product, but the fluff on the surface was converged with silicon and the appearance was poor.

Comparative Example 2 The suede-like artificial leather-like sheet of Example 1 had a molecular weight of 10,
The same treatment as in Example 1 was carried out except that 000 dimethyl silicon was used. The texture and appearance were as good as those before the treatment, but the artificial leather was good, but the abrasion resistance was almost not improved at 700 times compared to 600 times of the untreated product.

[0044]

The suede-like artificial leather obtained by the present invention has a high degree of abrasion resistance, has a soft texture and an elegant appearance, and can be used in a wide range of applications such as shoes, gloves, vehicle seats, and furniture. Can be used effectively.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D06P 3/00 D06P 3/00 M D06M 3/38 F term (Reference) 3B154 AA08 AB22 BA25 BB58 BB59 BD18 BF07 BF11 BF30 DA07 DA09 DA13 DA19 4F055 AA02 AA18 BA02 CA15 EA05 EA07 EA12 EA14 EA34 FA18 GA02 HA04 HA22 4H057 AA01 AA02 BA02 DA01 DA31 DA34 EA90 GA03 GA22 4L031 AA14 AA20 AB11 AB34 BA32 CA05 A05 AC07

Claims (6)

[Claims] 1. A fibrous base material layer comprising a three-dimensional entangled nonwoven fabric made of ultrafine fibers having a single fiber fineness of 0.5 decitex or less and a porous structure of an elastic polymer existing in the entangled space, A sheet having a microfiber nap layer continuous with microfibers of a substrate layer, wherein a silicon-based compound having a molecular weight of 50,000 or more is used in an amount of 0.5 to 5 to the fibrous base.
Suede-like artificial leather with a weight percent content. 2. The three-dimensional entangled nonwoven fabric has a single fiber fineness of 0.00.
Ultrafine fibers of 5 to 0.02 dtex are 100 to 400
2. The suede-like artificial leather according to claim 1, wherein the artificial suede leather is composed of a bundle of ultra-fine fibers. 3. A sports shoe obtained by using the suede-like leather-like sheet according to claim 1. 4. A sheet using the suede-finished leather-like sheet according to claim 1 or 2 as an overlay. 5. A method for producing a suede-like artificial leather, comprising sequentially performing the following steps (1) to (8). However,
Regarding the steps (6) to (8), their order may be changed or they may be performed simultaneously. (1) a step of forming a web of microfiber-generating fibers that generate microfibers of 0.5 decitex or less, (2) laminating webs, needle punching and delamination strength of 2 kg
(3) a step of pressing the needle-punched nonwoven fabric, (4) a step of impregnating a polymer elastic solution or dispersion to solidify the polymer elastic body, (5) A step of generating microfibers from microfiber-generating fibers, (6) a step of shaving the surface of the obtained fibrous base, (7) a step of dyeing the fibrous base, and (8) a molecular weight of 50,000 or more. A step of applying a silicon compound to the fibrous substrate in an amount of 0.5 to 5% by weight 6. The suede according to claim 5, wherein the step (5) generates an ultrafine fiber bundle in which 100 to 400 ultrafine fibers having a single fiber fineness of 0.005 to 0.02 decitex are bundled from the ultrafine fiber generating type fiber. Production method of artificial leather.