KR20150001363A - polyester artificial leather impregnated with elastomer having uniform color and method for manufacturing the same - Google Patents

Abstract

The present invention relates to dyeing of artificial leather having polyurethane, polyuria, or a mixture of the same impregnated as an elastomer in a polyester microfiber non-woven fabric with a dispersion dye and a vat dye. According to the present invention, an artificial leather product having uniform surface color by having a polyester microfiber and a elastomer which is polyurethane, polyuria, or a mixture of the same dyed into the same color can be manufactured.

Description

Technical Field [0001] The present invention relates to an artificial leather impregnated with an elastomer-impregnated polyester fiber and a method for producing the same,

TECHNICAL FIELD The present invention relates to a polyester fiber artificial leather impregnated with an elastic body such as polyurethane or polyurea, and more particularly to artificial leather having excellent wash fastness, water fastness and fastness to sweat fastness, will be.

Artificial leather is made by impregnating a nonwoven fabric formed by three-dimensionally entangled microfine fibers into an elastomeric polymer, and has a soft texture and a unique appearance similar to natural leather. Therefore, shoes, clothes, gloves, miscellaneous goods, And the like.

Such artificial leathers are required to have properties such as flexibility, surface quality, abrasion resistance, light resistance, and washing resistance depending on the application to be used. Among these properties, in particular, the quality of the surface is commonly required in applications requiring high sensitivity of artificial leather. In order to uniformize the color of the surface, one of the quality characteristics of the surface is that of polyurethane-impregnated polyester artificial leather It is difficult to implement because after dyeing with disperse dyestuff, it is subjected to reduction washing to remove dyes contaminated with polyurethane, which is a cause of deterioration of washfastness, water fastness, perspiration fastness, However, since the polyurethane has a relatively low color density as compared with the polyester fiber, the surface color of the artificial leather is not uniform because the polyester fiber and the polyurethane appear as different colors . On the other hand, by removing a relatively small amount of dye from the polyurethane by weakening the reduction washing, the dichroic property of the polyester fiber and the polyurethane is alleviated, and the color of the surface of the artificial leather may appear uniform, The washing fastness, water fastness and perspiration fastness drop sharply due to the large amount of dyes present.

Therefore, development of an artificial leather dyeing method which can improve the dichromaticity of polyester fiber and polyurethane while improving the washing fastness, water fastness and perspiration fastness of artificial leather is demanded.

Korean Patent Publication No. 0588596 discloses a method for producing an artificial leather excellent in fastness with low transferring property. In the above publication, a knitted fabric is manufactured using a 2-bar tricot knitting machine using a microfiber sea shoe filament and a general polyester yarn, and then subjected to polyurethane impregnation after line-brushed or heat-treated, followed by buffing, The present invention provides a method for producing an artificial leather which is excellent in fastness and is excellent in fastness due to dyeing with an acid dye and a disperse dye in dyeing and heat-treating artificial leather. However, There is no description that can solve the demand for dichroism improvement by the above.

To meet this need, the present invention relates to a method for dyeing an elastomeric portion of polyester artificial leather dyed with a disperse dye, such as a polyurethane or polyurea, into a dyed dye to produce dyes between the polyester fiber and the elastomer And to provide artificial leather dyes having a uniform surface color and high fastness properties.

In order to solve the above problems, the present invention provides a method for dyeing artificial leather comprising a polyester microfine fiber nonwoven fabric impregnated with at least one elastic material selected from polyurethane and polyurea with a disperse dye, (Evaluated by ISO 105C06), water fastness (evaluated by ISO 105E01), and perspiration fastness (evaluated by ISO 105E04) are all at least grade 4, and the color difference DE between the polyester microfine fibers and the elastic body ) Of not more than 3.0 are provided with a uniform color.

The present invention also relates to a method for dyeing artificial leather comprising a polyester microfine fiber nonwoven fabric impregnated with at least one elastic material selected from polyurethane and polyurea with a disperse dye and then subjecting the synthetic leather to dyeing with a strong alkali and a reducing agent, The present invention also provides a process for producing an elastomer-impregnated polyester fiber artificial leather having uniform color, including dyeing with 0.01 to 4.00% owf.

According to the present invention, the dyed elastomer-impregnated polyester fiber artificial leather is dyed with a disperse dye and a bat dye, and the dichromaticity between the polyester fiber and the elastic body is remarkably reduced while maintaining a high level of fastness, do.

According to the present invention, the color difference between the elastomer and the fiber is reduced only by the addition of the bat dye under the general reduction washing process and conditions in the production of the elastomer-impregnated polyester fiber artificial leather, so that the conventional dyeing process can be easily manufactured without additional process.

Hereinafter, the present invention will be described in detail.

The artificial leather of the present invention is characterized in that the microfine fibrous nonwoven fabric is impregnated with an elastic body and dyed with a disperse dye and then dyed with a vat dye so that washing fastness by ISO 105C06, water fastness by ISO 105E01 and sweat by ISO 105E04 And the color difference (DE) between the polyester superfine fiber and the elastic body is 3.0 or less.

The fiber constituting the artificial leather of the present invention is a disperse dye fluorine-containing ultrafine fiber to be used in combination with an elastic body, and may be selected from the group consisting of polyethylene terephthalate, polyoxyethylene benzoate, polybutylene terephthalate, polytrimethylene terephthalate, At least one selected from the group consisting of polyacrylic, polyvinyl alcohol, polytetraethylene terephthalate and acetate can be used, and polyester is more preferable.

In this case, the monofilament fineness of the disperse dye fluorine-containing microfine fiber is preferably 0.001 to 6 denier, more preferably 0.01 to 3 denier, and the total fineness is preferably 10 to 340 denier. When such a fiber is used, Artificial leather dyes can be obtained.

The elastomer of the present invention is at least one selected from polyurethane and polyurea, and specifically, it may be a polycarbonate diol type, a polyester diol type or a polyether diol type alone or a combination thereof, but is not limited thereto .

The elastic body has an easily stretched characteristic, and when the content of the elastic body is increased, the elongation of the artificial leather can be improved. However, if the content of the elastomer is too large, it may be excessively stretched at the time of molding and wrinkles may occur. Therefore, it is necessary to adjust the content of the elastomer in consideration of elongation characteristics. In the artificial leather according to the present invention, it is preferable that the nonwoven fabric made of the above-mentioned disperse dye fluorine-containing fibers is 60 to 80% by weight and the elastomer is 20 to 40% desirable.

If the amount of the elastomer is less than 20% by weight, the elongation is low and the molding process is not easy. If the elastomer is contained in an amount exceeding 40% by weight, wrinkles may occur in the artificial leather during molding.

The disperse dye used in the present invention may be at least one selected from the group consisting of an azobenzene disperse dye, an anthraquinone disperse dye, a heterocyclic disperse dye, a condensate disperse dye and a diester type disperse dye.

As the bat dyes used in the present invention, anthraquinone dyes and indigo dyes can be used.

Although the bat dye is insoluble in water and has low affinity to fibers, since the water-soluble leuco compound obtained by reduction in an alkaline reducing bath has affinity for the fiber, when the dye is dyed, it is adsorbed to the fiber Which is then returned to the original insoluble dye on the fiber by oxidation and has the advantage of obtaining excellent daylight and washing fastness.

However, bat dyes are used only for dyeing cotton fibers, and dyeing of synthetic fibers such as polyester is hardly used because dyeing is difficult.

Disclosed is a disperse dye which is used in dyeing and is contaminated with polyurethane or polyurea elastomer, is discharged from the reducing washing and cleaning process into the bath, the color density of the elastic portion is less than that of the polyester fiber, In order to compensate the occurrence of this phenomenon, it is characterized in that it is put into a reduction washing process with a vat dye capable of dyeing under reducing washing conditions to dye the elastic body.

According to the above method, it is possible to remarkably improve the dichroism between the polyester fiber and the elastic body while maintaining a high level of fastness when dyeing artificial leather with a disperse dye.

According to the present invention, it is possible to easily absorb a bat dye into a polyurethane or polyurea elastomer without a process added in a conventional dyeing process, and it is possible to prevent the dyestuff of the polyester fiber and the elastomer due to the bat dye absorbed in the elastomer, It is possible to solve the problem that the surface color of the artificial leather dyed material is not uniform.

In the present invention, the dyeing of the artificial leather with the disperse dye is carried out by using dyeing conditions generally used for polyester fibers, the temperature being 100-135 ° C., preferably 110-130 ° C., the dyeing time being polyurethane It is preferable that the embrittlement of the polyurea elastomer is 20 to 60 minutes in terms of cost.

At this time, the pH of the dye aqueous solution is preferably adjusted to 4 to 5 with a pH adjusting agent such as acetic acid. As the dispersing agent to be used at this time, it is preferable to use a polyalkylene oxide adduct of an alkyl naphthalene type or polyhydric alcohol fatty acid ester such as? -Naphthalene sulfonic acid formaldehyde condensate and its sulfuric acid.

After the dyeing process of the artificial leather dyed product of the present invention is completed, reduction washing is performed under the general reducing washing condition using sodium hydroxide and sodium hydrosulfite. As described above, Characterized in that a bat dye according to the following method is added and used.

After the dyeing with the disperse dye is completed, the polyurethane or polyurea elastomer in the artificial leather is contaminated with a large amount of disperse dye, so that the disperse dye of the elastic substance is hydrolyzed by using sodium hydroxide which is a strong alkali and sodium hypasulfate which is a reducing agent (Decolorized) and removed.

At this time, sodium dithionite and sodium hyposulfate are added together with the vat dye to remove the disperse dye, and the elastic substance having the lowered color density is dyed. The sodium hydroxide and the sodium hyposulfate are added in an amount of 1 to 5 g / L and 2 to 10 g / L And the batt dye is used in an amount of 0.01 to 4.00% owf (fiber weight), depending on the color density to be expressed. It is preferable that the treatment is carried out at 60 to 80 ° C for 20 to 30 minutes, The dyestuff is removed and the elastic body is dyed with a bat dye, but the elastomer is dyed and it is difficult to dye the fiber, which is an optimal condition to reduce the difference in hue between the elastomer and the fiber.

If the amount of the sodium hydroxide used is less than 1 g / L, the expression of the alkaline atmosphere is too weak to reduce the dyeing of the vat dye, and if it exceeds 5 g / L, the dyeing with the vat dye becomes too active, So that the difference in color tone between the elastic body and the fibers can not be reduced, which is not preferable.

When the amount of sodium hypophosphite used is less than 2 g / L, the reducing power is so weak that the vat dye is reduced and is difficult to be dyed in the elastomer. When the amount is more than 10 g / L, the dyeing with the dyestuff dye is activated too much, Can not reduce the difference in the hue of the liver and can cause uneven dyeing, which is not preferable.

When the amount of the bat dye used is 0.01 o.w.f. , The bat dye is hardly dyed in the elastomer, and if it exceeds 4.00% owf, the dyeing by the dyestuff dye is activated too much, so that it is not dyed in addition to the elastomer, so that the difference in hue between the elastomer and the fiber can not be reduced, It is not desirable.

The artificial leather dyes of the present invention prepared as described above were dyed with disperse dyes and vat dyes and were evaluated for their fastness to washing (evaluated by ISO 105C06), water fastness (evaluated by ISO 105E01) and sweat fastness (evaluated by ISO 105E04) ) Is at least grade 4, and the color difference (DE) between the polyester fiber and the elastic body is 3.0 or less.

Hereinafter, the present invention will be described in detail with reference to examples and comparative examples. It is to be understood, however, that these examples are for illustrative purposes only and are not to be construed as limiting the scope of the invention as defined by the appended claims. And will be apparent to those skilled in the art to which the present invention pertains.

[Example 1]

The polyurethane-impregnated polyester artificial leather prepared by impregnating a nonwoven fabric composed of polyester microfiber having a single fiber fineness of 0.15 denier with 30 wt% of a polyurethane elastomer and eluting and brushed was dyed under the following dyeing conditions in a dyeing machine.

<Conditions for dyeing>

Disperse Dye: See Table 1 below as an anthraquinone disperse dye

Dispersant: nonionic fatty acid ester 1 g / l

Acetic acid: 1 g / l

Waste: 1:30

Dyeing temperature and time: maintained at 120 ° C for 60 minutes

After completion of dyeing, the dyeing residue was discharged from the dyeing machine, and water was again supplied to the dyeing machine and then treated under the following reducing washing conditions.

<Reduction Cleaning Conditions>

Sodium hydroxide: 4 g / l

Sodium hypasulfite: 8 g / l

Bat dye: See Table 1 below

Waste: 1:30

Reduction Cleaning Temperature and Time: Maintained at 80 ° C for 20 minutes

After the reduction washing, it was sufficiently washed with clear water and then dried at 120 ° C for 10 minutes to prepare an artificial leather dyed product.

[Examples 2 to 4]

An artificial leather dyed product was prepared in the same manner as in Example 1, except that the disperse dye and the bat dye were used in the same manner as in Example 1,

[Examples 5 to 8]

The disperse dye and the bat dye in Example 1 were used as shown in Table 1 below An artificial leather dyed product was prepared in the same process and conditions as in Example 1, except that the polyester artificial leather was dyed with 70% by weight of a nonwoven fabric composed of polyester microfine fibers and 30% by weight of a polyurethane film.

[Comparative Examples 1 to 4]

An artificial leather dyed product was prepared in the same manner as in Example 1 except that the bat dye was not added in Examples 1 to 4.

[Comparative Examples 5 to 8]

Artificial leather dyes were prepared according to the same processes and conditions as in Examples 5 to 8 except that the bat dye was not added in Examples 5 to 8.

The wash fastness, water fastness and fastness to sweat of the artificial leather dyes prepared in the above Examples and Comparative Examples were measured / evaluated in accordance with ISO 105C06, ISO 105E01 and ISO 105E04, respectively, and were measured using the gray scale (ISO 105A03) The results are shown in Table 2 below and the color difference (DE) measured with a computer color matching system (CCM) (CE-7000A, X-Rite) is shown in Table 3 below.

division Disperse dye (o.w.f) Bat dye (o.w.f) blue Red yellow black blue Red yellow black Example 1 3 0.74 Example 2 3 0.62 Example 3 3 0.75 Example 4 10 1.5 Comparative Example 1 3 Comparative Example 2 3 Comparative Example 3 5 Comparative Example 4 10 Example 5 3 0.74 Example 6 3 0.62 Example 7 3 0.75 Example 8 10 1.5 Comparative Example 5 3 Comparative Example 6 3 Comparative Example 7 5 Comparative Example 8 10 The dyes of Examples 1 to 4 and Comparative Examples 1 to 4: polyurethane-impregnated polyester nonwoven fabric
70% by weight of a polyester nonwoven fabric and 30% by weight of a polyurethane film as the dyed materials of Examples 5 to 8 and Comparative Examples 5 to 8,

Wash fastness (grade) Water fastness (grade) Sweat fastness (grade) Example 1 4 to 5 4 to 5 4 to 5 Example 2 4 4 to 5 4 Example 3 4 to 5 4 to 5 4 Example 4 4 4 4 Comparative Example 1 4 to 5 4 to 5 4 to 5 Comparative Example 2 4 to 5 4 to 5 4 to 5 Comparative Example 3 4 to 5 4 to 5 4 to 5 Comparative Example 4 4 4 to 5 4

The color difference (DE) between the polyester nonwoven fabric and the polyurethane film Color difference (DE) Example 5 1.25 Example 6 2.51 Example 7 2.09 Example 8 0.79 Comparative Example 5 11.95 Comparative Example 6 8.90 Comparative Example 7 5.47 Comparative Example 8 7.05

From Table 2, it can be seen that the color difference between the polyester and the polyurethane is lowered by adding the bat dye in the reduction washing process from the above Table 3 without lowering the washing fastness, water fastness and sweat fastness even when the bat dye is added in the reduction washing step .

Claims (8)

(In accordance with ISO 105C06) in which the polyester microfine fiber nonwoven fabric is impregnated with at least one elastic material selected from polyurethane and polyurea, and the dyeing of the artificial leather is dyed with a disperse dye and then the dye dye is absorbed in the reduction washing step ), Water fastness (evaluated by ISO 105E01) and sweat fastness (evaluated by ISO 105E04) are all at least grade 4, and the color difference (DE) between the polyester microfine fibers and the elastic material is 3.0 or less Wherein the elastomer-impregnated polyester fiber is an elastomer-impregnated polyester fiber. The method according to claim 1,
Wherein the monofilament fineness of the polyester microfine fibers is 0.001 to 6 denier. The method according to claim 1,
Characterized in that the disperse dye is at least one selected from the group consisting of an azobenzene disperse dye, an anthraquinone disperse dye, a heterocyclic disperse dye, a condensate disperse dye and a diester type disperse dye. Impregnated polyester fiber artificial leather. The method according to claim 1,
Wherein said bat dye is at least one of an anthraquinone-based dyestuff dye and an indigo dye-based dyestuff. The method according to claim 1,
Characterized in that the bat dye is absorbed in an amount of 0.01 to 4.00% owf. The method according to claim 1,
Wherein the elastomer-impregnated polyester fiber-reinforced artificial leather is 60 to 80% by weight of the polyester microfine fiber nonwoven fabric, and 20 to 40% by weight of the elastic body is an artificial leather impregnated polyester fiber. The polyester microfine fiber nonwoven fabric is impregnated with at least any one elastic material selected from polyurethane and polyurea is dyed with a disperse dye and then a dyed dye is added together with a strong alkali and a reducing agent in a reducing washing step to obtain a hair dye in an amount of 0.01 to 4.00% A method for producing an elastomer-impregnated polyester fiber artificial leather having uniform color including dyeing with owf. 8. The method of claim 7,
Wherein the strong alkali is used in an amount of 1 to 5 g / L as sodium hydroxide, and the reducing agent is used in an amount of 2 to 10 g / L as sodium hyposulfate.