JP2003239181A - Artificial leather and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve fastness to light of dyed artificial leather by using specific dye in dyeing and/or providing the artificial leather with a specified substance after the dyeing. <P>SOLUTION: The artificial leather has integrated structure of an extra fine short fiber and a polymer elastic body, is dyed with azo-based disperse dye containing an electron attractive group in the molecule and is provided with electroconductive sol and/or a guanidine-based compound after the dyeing. The method for producing the artificial leather is provided. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an artificial leather and a method for producing the same, and more particularly to an artificial leather having excellent light resistance and a method for producing the same.

[0002]

2. Description of the Related Art A suede-like artificial leather in which ultrafine short fibers and a polymer elastic body are integrally structured is usually dyed in a predetermined color and used for various purposes. This artificial leather is composed of fibers with extremely small fineness and a polymer elastic body typified by polyurethane, and is capable of imparting an excellent texture and a high-class feeling. In order to maintain the feeling, it is particularly necessary to maintain the initial dyeing state as much as possible and suppress large fading. In order to suppress fading, it is particularly necessary to improve and improve light fastness, and conventionally, along with this purpose, selection of various dyes, inclusion of an ultraviolet absorber, etc. have been studied, but technically There was a limit to. Therefore, for applications where strict standards are required, such as artificial leather used for automobiles (for example, artificial leather used for car seats),
The current situation is that we have not yet taken sufficient measures to improve the lightfastness.

That is, the fading of artificial leather is regarded as a phenomenon caused by the decomposition of dyes by ultraviolet rays. However, it is difficult to find a dye that can sufficiently withstand it. However, since it does not essentially prevent the invasion of ultraviolet rays, there is still a limit to suppressing fading.

[0004]

In view of the above-mentioned limitations of the prior art, the object of the present invention is to use a special dye for dyeing and / or to add a special substance after dyeing. In view of the above, it is an object of the present invention to provide an artificial leather in which the light fastness of a dyed material is improved and a method for producing the artificial leather.

[0005]

In order to solve the above-mentioned problems, the artificial leather according to the present invention is an artificial leather in which ultrafine short fibers and a polymer elastic body are integrated, and the electron-withdrawing group is a molecule. It is characterized by being dyed with an azo disperse dye contained therein. That is, the artificial leather has improved light fastness by using a special dye for dyeing.

Further, the artificial leather according to the present invention is an artificial leather in which ultrafine short fibers and a polymer elastic body are integrated, and is characterized in that a conductive sol is applied after dyeing. . That is, the artificial leather has improved light fastness by applying a special substance (conductive sol) after dyeing. As the conductive sol, for example, a sol containing alumina as a main component can be used.

Further, the artificial leather according to the present invention is an artificial leather in which ultrafine short fibers and a polymer elastic body are integrated, and is characterized in that a guanidine compound is applied after dyeing. Become. That is, the artificial leather has improved light fastness by applying a special substance (guanidine compound) after dyeing. As the guanidine compound, for example, a compound containing guanidine phosphate as a main component can be used.

Further, the artificial leather according to the present invention is an artificial leather in which ultrafine short fibers and a polymeric elastic body are integrated, and is characterized in that a conductive sol and a guanidine compound are applied after dyeing. It consists of That is, special substances (conducting sol and guanidine compounds) after dyeing
Is an artificial leather having improved light fastness.

Further, in the present invention, the light fastness can be further improved by combining the above-mentioned special dye and a special substance applied after dyeing. That is,
The artificial leather according to the present invention is an artificial leather in which ultrafine short fibers and a polymer elastic body are integrated, and is dyed with an azo disperse dye having an electron-withdrawing group in the molecule, and a conductive sol after dyeing. Is added.

Further, the artificial leather according to the present invention is an artificial leather in which ultrafine short fibers and a polymer elastic body are integrated, and is dyed with an azo disperse dye having an electron-withdrawing group in the molecule. And a guanidine compound is added after dyeing.

Further, the artificial leather according to the present invention is an artificial leather in which ultrafine short fibers and a polymeric elastic body are integrated, and is dyed with an azo disperse dye having an electron-withdrawing group in the molecule. The conductive sol and the guanidine-based compound are added after dyeing.

The artificial leather as described above is suitable for use in applications where light fastness is particularly required. For example, it is suitable as a material used for automobiles, especially as a surface material for car seats. is there.

The method for producing an artificial leather according to the present invention is a method for producing an artificial leather in which ultrafine short fibers and a polymeric elastic body are integrated into a single structure,
The method comprises dyeing with an azo disperse dye having an electron-withdrawing group in the molecule.

In this method, it is preferable to use a long-chain fatty acid ester-based leveling agent of polyalkylene glycol for dyeing.

Further, the method for producing artificial leather according to the present invention is characterized in that the artificial leather in which the ultrafine short fibers and the polymer elastic body are integrally structured is dyed and dried, and then a conductive sol is applied. Consists of.

Further, the method for producing an artificial leather according to the present invention is characterized in that the artificial leather having an integrated structure of ultrafine short fibers and a polymeric elastic body is dyed and dried, and then a guanidine compound is added thereto. Consist of way.

Further, in the method for producing an artificial leather according to the present invention, the artificial leather in which the ultrafine short fibers and the polymer elastic material are integrally structured is dyed and dried, and then both the conductive sol and the guanidine compound are applied. The method is characterized by that.

It is preferable to apply the special substance such as the conductive sol or the guanidine compound at a temperature of 80 ° C. or higher and 120 ° C. or lower. Particularly when the ultrafine short fibers are made of polyester short fibers and the polymer elastic body is made of polyurethane resin, it is possible to prevent the dye dyed on the polyester from contaminating the polyurethane by setting such a temperature range. .

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to Examples. The artificial leather according to the present invention is an artificial leather in which ultrafine short fibers and a polymeric elastic body are integrated. In the present invention, the type of the polymer forming the ultrafine short fibers constituting the artificial leather is not particularly limited, as long as the target fineness of the ultrafine short fibers and the like can be obtained, polyester, polyamide, such as acrylic polymer as appropriate. Can be used. Of these, polyester type ultrafine short fibers are preferable from the viewpoint of compatibility with the special disperse dye used in the present invention.

The fineness of the ultrafine short fibers is 0.001
It is preferably in the range of denier to 0.3 denier. If the fineness of the ultrafine short fibers is higher than 0.3 denier, the surface touch becomes rough and the appearance becomes poor, which is not preferable. Further, if the fineness is less than 0.001 denier, the fiber strength is lowered, fluffing is increased, and there is a problem that the coloring property is lowered in dyeing, which is not preferable.

The type of elastic polymer (polymer elastic body) constituting the artificial leather is not particularly limited, but within the range where the target artificial leather modulus and the like can be obtained, elastic polymers such as polyurethane and acrylic Can be used as appropriate. Above all, it is preferable to use a polyurethane-based elastic polymer.

In order to maintain the structure of the artificial leather, the amount of the elastic polymer added to the ultrafine short fibers is
It is preferably in the range of about 10% by weight to 50% by weight, and more preferably in the range of 10% by weight to 40% by weight. If the amount of the elastic polymer added is higher than 50% by weight, the elastic modulus will increase the product modulus, and the product modulus will increase to 10% by weight.
If it is lower, the modulus is lowered, which is not preferable.

The suede-like artificial leather according to the present invention is
For example, a composite fiber containing polystyrene as the sea component and polyester as the island component is spun by the sea-island spinning method so that the elongation rate of the island component is 100% or more, for example, 1.8 to 3.
A low-strength drawing of 0 times is performed, and crimping / cutting is performed to make short fibers, and the short fibers are made into a web sheet using a carding machine or a cross wrapper, and then fiber entanglement processing is performed by needle punching or the like. The felt obtained by the above, fiber ultrafine treatment, polymer elastic body imparted,
It can be obtained by slicing and buffing into an artificial leather base fabric, and dyeing it.

In the dyeing according to the present invention, a special dye is used for the above artificial leather, and in particular, it is dyed with an azo disperse dye having an electron-withdrawing group in the molecule. Examples of the electron-withdrawing group include CN, NO ₂ ,
By arranging such an electron-withdrawing group as a group such as Cl in the molecule, the stability of the azo group can be enhanced. By dyeing with a special dye consisting of an azo-based disperse dye having such an electron-withdrawing group in the molecule, the light fastness is appropriately improved, as shown in Examples described later. Also,
As a result of measuring the pH of the dough in order to examine the degree of deterioration and denaturation after light irradiation, it was also confirmed that the pH was maintained at a desired value or higher.

For dyeing with an azo disperse dye having an electron-withdrawing group in the molecule, it is preferable to use a long-chain fatty acid ester-based leveling agent of polyalkylene glycol. By using such a specific leveling agent for a specific dye, an excellent levelness in dyeing is obtained and an improvement in light fastness is uniformly achieved over the entire fabric.

In the present invention, a special substance is added after dyeing in order to improve light fastness. As the special substance, a conductive sol and / or a guanidine compound is added. The conductive sol is a sol-like substance that facilitates the movement of electrons, and as such a conductive sol, one having alumina as a main component is particularly preferable. Further, the guanidine-based compound is generally used for the purpose of imparting flame retardancy, but in the present invention, in order to improve light fastness in different steps (after dyeing) for different purposes. The compound containing guanidine phosphate as a main component is particularly preferable.

Particularly in the case of artificial leather in which the ultrafine short fibers are made of polyester short fibers and the polymeric elastic body is made of polyurethane resin, the application of the conductive sol and / or the guanidine type compound is within a temperature range of 80 ° C to 120 ° C. It is preferable to carry out. If the temperature is out of this range, the dye dyed to the polyester short fibers may be transferred to the polyurethane resin side, and the polyurethane resin may be contaminated.
By applying within the above temperature range, the occurrence of such a problem can be reliably prevented.

The artificial leather according to the present invention can be applied to almost all uses requiring improvement in light fastness, and is particularly suitable for automobiles, especially for car seats. In addition, car interiors and airplane interiors, seats, hospital interiors, cabins, theater and hall interiors, seats, general home and office wallpaper, curtains, general clothing, chairs,
It is applicable to almost anything that can use artificial leather as a material, such as sofas, shoes, hats, bags, and gloves.

[0029]

EXAMPLES The present invention will be described below based on examples. The effect of the present invention was confirmed by this example. Example 1 A special dye and leveling agent according to the present invention were used. A hairy non-woven fabric composed of polyester short fibers having a single yarn fineness of 0.18 denier and a polyurethane resin, and having a fiber-polyurethane resin ratio of 80:20, has a stable azo group in the molecule represented by the following formula 1. Red azo disperse dyes (“Dynics” Red, HS-S, manufactured by Dyster Co.) in which electron-withdrawing groups such as NO ₂ and CN groups are arranged to enhance the properties and yellow and blue quinone disperse dyes respectively 2% owf based on weight, polyalkylene glycol long-chain fatty acid ester-based leveling agent (Nichika Chemical Co., Ltd., "Sun Salt" AL
-200) was stained with 2 g / L at 125 ° C. for 45 minutes. Then, the product was reduced and washed with hydrosulfite, caustic soda, and a surfactant, further washed with hot water and water, and dried.

[0030]

[Chemical 1]

Comparative Example 1 The red azo disperse dye of Example 1 was replaced with a red quinone dye (“
Instead of Sumicaron "Brilliant Pink SERN, manufactured by Sumitomo Chemical Co., Ltd.), the same dyeing, reduction washing, hot water washing, and drying as in Example 1 was performed.

Comparative Example 2 The red azo disperse dye of Example 1 was prepared by mixing the red azo disperse dye of Example 1 with no electron withdrawing group such as NO ₂ or CN group for enhancing the stability of the azo group (“Sumikaron” red, S3BFL). ,
(Manufactured by Sumitomo Chemical Co., Ltd.), and dyeing, reduction washing, hot water washing, and drying were performed in the same manner as in Example 1.

Comparative Example 3 The dispersion leveling agent of Example 1 was used as the product name "Nikka Sun Salt" S.
D-07 (manufactured by Nichika Chemical Co., Ltd.) was replaced with 2 g / L, and dyeing, reduction washing, hot water washing, and drying were carried out in the same manner as in Example 1.

Example 2 Dyeing, reduction washing, hot water washing, and drying were carried out in the same manner as in Example 1, and then, on the back surface of the dyed nonwoven fabric after the above dyeing and drying, "luminova" (a luminous pigment containing alumina as a main component) ( 12% by Nemoto Special Chemical Co., Ltd., "Nesticker" BP-170 (manufactured by Nichika Chemical Co., Ltd.) 8 which is an acrylic resin as a binder.
An aqueous mixture of 0% and 8% turpentine was applied at 60 g / m ² using a rotary screen and dried at 120 ° C.

Comparative Examples 4 and 5 In Example 2, 5% of the reflective beads "Unipies" (manufactured by Union Chemical Co., Ltd.) were used instead of alumina (Comparative Example 4), and carbon black "Neuractin" black, FLPR ( The same treatment as in Example 2 was performed using 0.5% (manufactured by Dainichiseika Kogyo KK) (Comparative Example 5).

Example 3 The dyed non-woven fabric obtained in Example 1 was treated with guanidine phosphate "Nikka Phynon" P as guanidine phosphate.
It was immersed in a 25% aqueous mixed solution of -205 (manufactured by Nichika Chemical Co., Ltd.), squeezed with a mangle, and dried at 120 ° C. The drawing ratio was 65%.

Comparative Example 6 "Eleton" F-1 (manufactured by Tokai Oil Co., Ltd.), which is an aqueous solution of a phosphoric acid ester compound instead of the guanidine phosphate of Example 3.
Dip it in a 10% aqueous mixture of and
It was dried at 0 ° C. The drawing ratio was 65%.

Example 4 The dyed non-woven fabric obtained in Example 2 was mixed with guanidine phosphate "Nikka Phynon" P-205 (manufactured by Nichika Chemical Co., Ltd.).
Immerse in 25% aqueous mixture, squeeze with mangle, 120
It was dried at ° C. The drawing ratio was 65%. Then, on the back surface of the dyed non-woven fabric after dyeing and drying, 12% of "luminova" (manufactured by Nemoto Special Chemical Co., Ltd.), which is a phosphorescent pigment containing alumina as a main component, and "Nesticker" BP-170 (acrylic resin) as a binder. (Nikaka) 80
% Of which was mixed with 8% of turpentine was applied at 60 g / m ² using a rotary screen and dried at 120 ° C.

The results of Examples 1 to 4 and Comparative Examples 1 to 6 are shown in Table 1. The light fastness in Table 1 was evaluated as follows, and the pH of the fabric after the light irradiation was also measured in order to examine the deterioration and the degree of modification of the fabric after the light irradiation. The dough pH is preferably maintained at 5 or higher, more preferably 5.5 or higher, and even more preferably 5.8 or higher.

Evaluation of light fastness A 10 mm polyurethane foam was applied to the back surface of the sample, and a xenon tester Wacom WT333 (manufactured by Wacom Denso Co., Ltd.) was used. Black panel temperature: 89 ° C., irradiation intensity:
Light is irradiated under the conditions of 84 MJ and irradiation time: continuous 144 hours, and the color difference from the non-irradiated portion is graded by gray scale.

[0041]

[Table 1]

As shown in Table 1, Example 1 according to the present invention
In Nos. 4 to 4, as compared with Comparative Examples 1 to 6, it was possible to improve the light fastness while maintaining the good fabric pH after light irradiation. Further, from the comparison between Example 1 and Examples 2 to 4, further dyeing with an azo-based disperse dye having an electron-withdrawing group in the molecule and then adding a conductive sol or / and a guanidine-based compound to further improve light resistance. It turns out that it can be improved.

[0043]

As described above, according to the artificial leather and the method for producing the same according to the present invention, the artificial leather is dyed with an azo type disperse dye having an electron-withdrawing group in the molecule to improve the light resistance. We were able to. Further, the light resistance could be further improved by adding an electrically conductive sol and / or a guanidine compound after dyeing.

Continued front page    (72) Inventor Akito Nagai             Saka, 1-16-45, Hanado, Fukui City, Fukui Prefecture             Iovex Co., Ltd. Synthetic fiber factory F-term (reference) 4F055 AA21 BA12 CA16 CA18 DA20                       EA04 EA11 EA24 EA34 FA15                       HA18 HA22                 4H057 AA01 BA08 CA38 CB18 CC03                       DA01 DA17

Claims (16)

[Claims] 1. An artificial leather having an ultrafine short fiber and a polymeric elastic body integrated with each other, which is dyed with an azo disperse dye having an electron-withdrawing group in the molecule. 2. An artificial leather in which ultrafine short fibers and a polymeric elastic body are integrated into one body, wherein the conductive sol is applied after dyeing. 3. An artificial leather in which ultrafine short fibers and a polymeric elastic body are integrally structured, wherein a guanidine compound is applied after dyeing. 4. An artificial leather in which ultrafine short fibers and an elastic polymer are integrated into one body, wherein the conductive sol and the guanidine compound are applied after dyeing. 5. An artificial leather in which ultrafine short fibers and a polymer elastic body are integrated into one body, which is dyed with an azo disperse dye having an electron-withdrawing group in the molecule, and a conductive sol is applied after dyeing. Artificial leather characterized by having. 6. An artificial leather in which ultrafine short fibers and a polymer elastic body are integrated into one body, which is dyed with an azo disperse dye having an electron-withdrawing group in the molecule, and a guanidine compound is added after dyeing. Artificial leather characterized by being. 7. An artificial leather having an ultrafine short fiber and a polymer elastic body integrated with each other, which is dyed with an azo disperse dye having an electron-withdrawing group in its molecule, and after dyeing, a conductive sol and a guanidine An artificial leather characterized by being provided with a compound. 8. The ultrafine short fibers are made of polyester short fibers, and the elastic polymer is made of polyurethane resin.
The artificial leather according to any one of claims 1 to 7. 9. The fineness of the polyester-based short fibers is 0.
The artificial leather of claim 8 in the range of 001 denier to 0.3 denier. 10. The artificial leather according to claim 1, which is used for automobiles. 11. A method for producing an artificial leather, which comprises dyeing an artificial leather having an ultrafine short fiber and a polymeric elastic body integrated with an azo disperse dye having an electron-withdrawing group in the molecule. 12. A long-chain fatty acid ester-based leveling agent for polyalkylene glycol is used for dyeing.
1. The method for producing artificial leather of 1. 13. A method for producing an artificial leather, which comprises applying an electrically conductive sol after dyeing and drying the artificial leather having an ultrafine short fiber and a polymer elastic body integrated with each other. 14. A method for producing an artificial leather, which comprises applying an guanidine compound after dyeing and drying the artificial leather having an ultrafine short fiber and an elastic polymer as an integral structure. 15. A method for producing an artificial leather, characterized by dyeing and drying the artificial leather having an ultrafine short fiber and an elastic polymer as an integral structure, and then applying a conductive sol and a guanidine compound. 16. The method for producing artificial leather according to claim 13, wherein the applying is performed at a temperature of 80 ° C. or higher and 120 ° C. or lower.