KR101002294B1 - A methods of dyeing polyamide artificial leather by cotinuous process - Google Patents

Abstract

The present invention relates to a method for continuous dyeing of polyamide artificial leather, when the polyamide artificial leather is reduced in the presence of alkali and dyed with a dye that becomes water-soluble, the polyamide artificial leather is continuously padded in salt solution, then padded, dried, After immersion in the reducing agent solution, characterized in that the padding, steaming, oxidation, washing and drying.

The present invention has high productivity because the polyamide artificial leather is dyed in a continuous process, and can evenly dye not only the surface but also the cross section of the polyamide artificial leather.

In addition, the present invention can greatly improve the dyeing fastness of the dyed polyamide artificial leather.

Polyamide, artificial leather, dyeing method, continuous process, dye fastness, reduction, oxidation, water solubility.

Description

A method of dyeing polyamide artificial leather by cotinuous process             

1 is a process schematic diagram of the present invention.

Figure 2 is a one step process schematic of the present invention.

3 is a schematic representation of a two step process of the present invention.

Explanation of symbols on the main parts of the drawings

1: undyed polyamide artificial leather 2: salt bath

2a, 4a: padding mangle 3: dryer

4: reducing agent solution bath 5: vaporizer

6: centuries 7: dryer

8: dyed polyamide artificial leather 9: hydrogen peroxide aqueous solution bath

A: Padded and dried polyamide artificial leather after immersion in salt bath

The present invention relates to a method for continuous dyeing of polyamide artificial leather, and more particularly to a method for continuous dyeing of polyamide artificial leather with excellent dyeing fastness.

Since polyamide artificial leather is composed of polyamide microfiber and polyurethane elastomers, a large amount of dyes should be used for dyeing to obtain the same color as compared to general fabrics, and there is a problem in that dyeing fastness is poor.

In order to solve this problem, a method of dyeing polyamide artificial leather with a metal complex dye (Matal Complex Dye) is also implemented.

However, the dyeing method using a metal complex dye has a problem that the dye is released during the use of the dyed polyamide artificial leather due to lack of dyeing fastness during high concentration dyeing and washing.

On the other hand, Korean Patent Laid-Open Publication No. 1997-43574 discloses a method of first dyeing polyamide artificial leather with a metal complex dye, and then further dyeing it with a vat dye. However, the method has a problem that the dyeing process is complicated and the dyeing time is long because it must go through a two-step dyeing process. In addition, due to some dyed metal complex dyes, there was a problem that the color fastness is lowered.

On the other hand, in order to dye polyamide artificial leather using a small amount of dyes, a method of dyeing or printing polyamide artificial leather with a dye which is reduced by a reducing agent in the presence of alkali and becomes water-soluble has been proposed.

Specifically, Japanese Patent Laid-Open No. Hei 9-241980 discloses a method of dyeing polyamide artificial leather by dip dyeing in a rapid dyeing machine using a dye which is reduced by a reducing agent in the presence of alkali and becomes water-soluble. Because of the batch dyeing method rather than continuous, there was a disadvantage in productivity and economics.

In addition, Korean Patent Laid-Open Publication No. 1999-69133 discloses a method of dyeing polyamide artificial leather by the printing method using a vat dye, but in this case, dyeing fastness and productivity can be improved, but up to the inside of polyamide artificial leather There is a problem that the appearance is poor because of poor dyeing.

It is an object of the present invention to provide a method capable of dyeing polyamide artificial leather with good dyeing fastness not only to the surface but also to the inside by a continuous process so as to solve the conventional problems described above.

The present invention seeks to provide a method of dyeing polyamide artificial leather in a continuous process rather than in a batch with a dye which is reduced by a reducing agent in the presence of alkali and becomes water soluble.

In addition, the present invention can be dyed not only the surface of the polyamide artificial leather as well as the inside, to provide a continuous dyeing method of polyamide artificial leather that can improve the dyeing fastness of the dye.

The continuous dyeing method of the polyamide artificial leather of the present invention for achieving the above object, after dyeing the polyamide artificial leather with a dye that is reduced in the presence of alkali to become water-soluble after continuous immersion of the polyamide artificial leather in salt solution Padding, drying, after immersion in the reducing agent solution characterized in that the padding, steaming, oxidation, washing and drying.

Hereinafter, the present invention will be described in detail with reference to the drawings.

First, the present invention is padded after continuously immersed polyamide artificial leather in the padding salt bath (2) as shown in Figs.

1 is a process schematic diagram of the present invention to complete the dyeing in a one-step process, Figures 2 and 3 is a schematic diagram of the first and second steps of the present invention to complete the dyeing in a two-step process.

The padding salt bath is prepared by mixing a dye, a penetrant, water, and the like, which are reduced by a reducing agent in the presence of alkali and become water-soluble, in a predetermined ratio.

Sulfur dyes or vat dyes are used as the dye.

As sulfide dyes, Kami Yosul Black BF, manufactured by Nippon Kayaku, and Indanthren Black BB, manufactured by Dystar, are used.

It is preferable to use DS-20, a product of Daeyoung Chemical Co., Ltd., as the penetrant. The penetrant acts to allow the salt solution to penetrate well into the polyamide artificial leather, which is Fuji.

The padding salt solution is preferably composed of a composition ratio of 3 to 8% by weight of the dye, 1 to 2% by weight of the penetrant, and 96 to 90% by weight of water, but the composition of the padding salt solution is not particularly limited. .

After immersing the polyamide artificial leather in the padding salt solution and padding through the padding mangle (3). At this time, the pressure of the padding mangle is preferably 1 to 3 kg / cm 2, and the speed is 5 to 20 m / min. If the pressure of the mangle is lower than the above range, there is a fear that the salt solution does not penetrate well into the polyamide artificial leather, and if it exceeds the above range, the amount of the salt solution is too small, there is a possibility that a disproportionation phenomenon may occur.

Subsequently, after the padding of the salt solution, the drying process is performed in the dryer 3, but the temperature of the dryer is preferably performed for several minutes at a temperature of about 110 ° C to 130 ° C.

Subsequently, the polyamide artificial leather dried with the dye is padded after being immersed in the reducing agent solution bath 4 containing the reducing agent and various chemicals, wherein the dye is solubilized by the reducing agent and alkali, and the fiber It can penetrate inside.

The reducing agent solution is preferably composed of the following composition ratio, but the composition ratio is not limited in the present invention.

<Reducing agent solution>

▷ Reducing agent (hydrosulphite): 2-5% by weight (total weight)

▷ Caustic soda 38 ° B┨ (NaOH 38 ° B┨): 3-8% by weight (total weight)                     

▷ Anhydrous screw (Na ₂ SO ₄ ): 3% by weight (total weight)

▷ Water: 92-84 wt% (Total Weight)

At this time, the pressure of the padded mangle is preferably 1-3 kg / cm 2 and the speed is 5-20 m / min. If the pressure of the padding mangle is lower than the above range, there is a concern that the chemical solution will not penetrate well into the artificial leather. If the padding mangle pressure is exceeded, the amount of the chemical solution penetrated into the artificial leather is too small, so that a sufficient reaction There is a fear that the uniformity of the dye may be lowered because it does not occur.

Subsequently, after the reductant solution padding, the vaporizer 5 undergoes a vaporization step, but the vaporization is preferably performed at 98 ° C.-105 ° C. for 20-40 minutes. Subsequently, the medium heat treated polyamide artificial leather is oxidized in a bath 9 of an aqueous hydrogen peroxide solution. Oxidation is preferably carried out in a water of 40 ~ 50 ℃ hydrogen peroxide aqueous solution. The bath 9 of the aqueous hydrogen peroxide solution is prepared by mixing about 3-5 g of aqueous hydrogen peroxide solution (35%) with 1 liter of water. However, the present invention does not specifically limit the concentration and mixing amount of the hydrogen peroxide water.

Subsequently, after the soaping and washing in the centuries (6), in which hot water of 90 to 98 ° C. and hot water of 70 ° C. are sequentially contained, all processes are finished by passing through a dryer (7).

The present invention may be carried out as a continuous one-step process as shown in Figure 1, the step 1 step of drying and padding after dipping in a salt bath as shown in Figures 2 and 3 padding, distillation, It is also possible to separate the two steps of oxidation, washing and drying.

In the case of the dry salt dye used in the present invention, crystals are formed inside the fiber after the oxidation / soaping process, and in the case of the sulfide dye, it is converted into a polymer material and thus has excellent washing durability.

Therefore, the polyamide artificial leather dyed by the present invention significantly reduces the staining and discoloration due to the migration of the dyes without the dye fixation treatment.

In addition, the present invention can dye the polyamide artificial leather of Fuji evenly evenly not only on the surface but also inside by a continuous process using the pad-steam method, and also has excellent productivity in the continuous process.

Hereinafter, the present invention will be described through Examples and Comparative Examples.

However, the present invention is not limited only to the examples.

Example 1

Polyamide artificial leather manufactured by impregnating a polyurethane elastomer with a polyamide microfiber nonwoven fabric having a single yarn fineness of 0.05 denier, and then eluting and brushing 5% by weight of a sulfur dye (product name: Kami Yosal Black BF), a penetrant (product name: Snogen D- 20) After immersion in the padding saline solution composed of 1% by weight and 96% by weight of water, the padding is passed through a padding mangle with a pressure of 2㎏ / ㎠ and a speed of 10m / min.                     

Subsequently, the padded polyamide artificial leather was dried in a drier at 120 ° C. for 2 minutes, and then a reducing agent composed of 3% by weight of dry grass, 5% by weight of sodium hydroxide, 3% by weight of hydrosulphite, and 89% by weight of water. After immersion in the solution, the padding was passed through a padding mangle with a pressure of 2 kg / cm 2 and a speed of 10 minutes m / min.

Subsequently, the resultant was heated for 30 minutes in a 100 ° C. steamer and then oxidized in an aqueous hydrogen peroxide aqueous solution [1 L of water / 4 g of hydrogen peroxide (35%)], washed with water and dried to prepare a dyeing product.

The results of evaluating the wash fastness and the homogeneity and productivity of the prepared dyeings are shown in Table 1.

Example 2

A dye was prepared in the same manner as in Example 1 except that the type of the dye constituting the padding salt solution was changed to a vat dye (trade name: Indanthren Black BB). The results of evaluating the wash fastness and the homogeneity and productivity of the prepared dyeings are shown in Table 1.

Comparative Example 1

The polyamide artificial leather of Example 1 was treated with a sulfide dye (product name: Kami Yosol Black BF), 4.5 wt%, an adjuvant (product name: Solbitose C-15), 40 wt%, caustic soda 5 wt%, and a reducing agent (product name: Long garnet-C) was printed directly with an automatic dyeing machine using a color printing system for printing using 5 wt% and 45.5 wt% of water.                     

At this time, the clay of the printing lagoon was 4,500cps, the edge pressure was 4.5kg / cm 2 and the edge speed was 15m / min.

Subsequently, the dried artificial leather was heat treated at 120 ° C. for 2 minutes, heated at 105 ° C. for 30 minutes in saturated steam, oxidized with aqueous hydrogen peroxide solution (35%), and dried to prepare a printed matter. The results of evaluating the wash fastness and the homogeneity and the productivity of the prepared prints are shown in Table 1.

Comparative Example 2

5% by weight of dry salt dye (dydrenren black BB), scavenger (product name: sorbitas C-15) 40% by weight, caustic soda 5% by weight, reducing agent (product name: longgarit-C) 5% by weight And a salt was prepared in the same process as in Comparative Example 1 except that the water was changed to 45% by weight. The results of evaluating the wash fastness and homogeneity and productivity of the prepared prints are shown in Table 1.

Comparative Example 3

After the polyamide artificial leather of Example 1 was added to the rapid dyeing machine, water and sulfide dyes (product name: Kami Yosol Black) were added to 2 g / l penetrant (product name: Snogen D-20) and a bath ratio of 1:20. BF) 25% OWF, 5 g / l caustic soda and 10 g / l reducing agent (product name: Longgarite C) were added in this order. Next, the dyeing machine temperature was started at 30 ℃ and the temperature was raised to 1 ℃ per minute and then dyed at 98 ℃ 60 minutes.                     

After dyeing, the salt solution was drained, fresh water was added, 2 g / l of hydrogen peroxide was added thereto, oxidized at 70 ° C. for 20 minutes, soaped with 80 ° C. warm water, washed with water, and dried to prepare a dyeing product. The results of evaluating the wash fastness and the homogeneity and the productivity of the prepared dyeings are shown in Table 1.

Comparative Example 4

A dye was prepared in the same manner as in Comparative Example 3 except that the type of dye was changed to a sulfur dye (trade name: Indanthren Black BB). Table 1 shows the results of evaluating the wash fastness and the homogeneity and productivity of the prepared dyeings.

Comparative Example 5

The polyamide artificial leather of Example 1 was dyed for 60 minutes at 98 ° C. using 20% owf of a dye-containing metal dye (Netrilane Black MR, manufactured by Yorkshire Korea) in a rapid dyeing machine, and then dyed and washed with water. . Table 1 shows the results of evaluating the wash fastness and the homogeneity and productivity of the prepared dyeings.                     

Evaluation results division Color fastness
(class) Uniformity Per unit hour
Production rate (m / min) Example 1 5 ○ 15 Example 2 4-5 ○ 15 Comparative Example 1 4-5 × 15 Comparative Example 2 4-5 × 15 Comparative Example 3 4 ○ 0.833 Comparative Example 4 4 ○ 0.833 Comparative Example 5 2 ○ 0.833

Various physical properties of Table 1 were evaluated by the following method.

Washing fastness

It evaluated by KS K 0430 A-1 method.

Bactericidal

The cross-section of the dyed polyamide artificial leather was cut with a razor blade and the color uniformity of the unit area was evaluated by five expert sensory tests.

○ When four to five of five people judged to be excellent, they were divided into ○, and when △ 2 to 3 of five people judged to be excellent, △.

·productivity

It is expressed as the amount of dye produced in unit time. In the case of dyeing using a rapid dyeing machine, the dye solution was expressed in the amount of production per unit time during dyeing under normal dyeing conditions in a rapid dyeing machine containing 4,000 L.

The present invention improves productivity and dyeing fastness of the dyeing product because the polyamide artificial leather is reduced by a reducing agent in the presence of alkali and dyed with a dye which becomes water-soluble in a continuous process.

In addition, the present invention can be dyed evenly to the inside as well as the surface of the polyamide artificial leather can be excellent in appearance of the dyeing.

Claims (6)

In dyeing polyamide artificial leather with a dye which is reduced in the presence of alkali and becomes water-soluble, the polyamide artificial leather is continuously padded after being immersed in salt solution, dried, and padded, heated, oxidized, washed and dried after being immersed in a reducing agent solution. Continuous dyeing method of polyamide artificial leather, characterized in that. The method of continuous dyeing of polyamide artificial leather according to claim 1, characterized in that the dye which is reduced in the presence of alkali and becomes water soluble is Vat dyes or Sulfur dyes. delete The method of continuous dyeing of polyamide artificial leather according to claim 1, characterized in that the salt solution is composed of dyes, penetrants and water which are reduced in the presence of alkali to be water-soluble. The method of continuous dyeing of polyamide artificial leather according to claim 1, characterized in that the reducing agent solution is composed of reducing agent, caustic soda, anhydrous forget-me-not and water. The continuous dyeing method of polyamide artificial leather according to claim 1, wherein the polyamide artificial leather subjected to the heat treatment is immersed in an aqueous hydrogen peroxide solution bath and oxidized.

Images