JPS6170083A - Manufacture of artificial leather dyeable in deep color - Google Patents

Abstract

PURPOSE:To obtain an artificial leather dyeable in deep color, by impregnating a binder in a nonwoven cloth, etc. made of a cation-dyeable fiber, and carrying out the wet coagulation of the binder, wherein the coagulation liquid or the binder solution is added with a metal sequestering agent. CONSTITUTION:A nonwoven cloth, or woven or knit fabric composed of a cation-dyeable fiber splittable into ultrafine fibers is impregnated with a solution prepaed by dissolving a binder in a solvent (e.g. dimethylformamide) having affinity to water, and is subjected to wet coagulation. In the above process, a metal sequestering agent (e.g. condensed phosphate) is added to said coagulation liquid or binder solution at a concentration of 0.05-5g/l, and coagulated. The decrease in the dyeing sites of the fiber (caused by the metallic ion in water) can be prevented, the dye adsorptivity of the fiber can be fully demonstrated, and an artificial leather dyeable in deep color can be produced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing deep dyeable artificial leather.

[Conventional technology] Conventional techniques for imparting dark color effects include creating microvoids on the fiber surface of the order of several microns to absorb light of a specific wavelength, or applying special polymers with different refractive indexes to the fiber surface. Coating methods are known.

However, the method of modifying the fiber surface cannot fully utilize the fiber strength of the polymer, resulting in a decrease in product strength, while the method of coating the fiber surface with a special polymer improves texture and touch. For artificial leather, which is important, it is difficult to impart a deep color effect until it is fully exhibited, and using copolymerized polymers,
The method of improving color development resulted in a decrease in fiber strength and was not practical. In other words, in order to take advantage of color development, other properties required of artificial leather had to be sacrificed.

On the other hand, in response to these demands, the present inventors have already developed ultra-fine I! The present invention provides a method for producing artificial leather that prevents a decrease in fiber strength and has good color development, texture, and touch. However, this artificial leather was not necessarily a satisfactory artificial leather because it was not able to take full advantage of the color development properties of the polymer.

[Problems to be Solved by the Invention] The present inventors have conducted intensive studies on a method for producing an artificial comparison that can be dyed with A without the above-mentioned drawbacks, and have discovered the present invention.

[Means for Solving the Problems 1] In other words, the present invention impregnates a nonwoven fabric, a woven or knitted fabric using cationic dyeable fibers with a binder dissolved in a solvent having an affinity for water, and wet-coagulates the nonwoven fabric or woven fabric using cationic dyeable fibers. ! The present invention relates to a method for producing artificial leather, which comprises adding a sequestering agent to a coagulating solution or a binder solution and then coagulating it.

The nonwoven fabrics and woven and knitted fabrics of the present invention are based on fibers using a cationic dye-dyeable polymer, and are made of dimethylformamide (
When impregnating a binder dissolved in a water-friendly solvent such as DMF (hereinafter abbreviated as DMF) and wet-coagulating it,
By wetting the fibers with the solvent, metal ions in the coagulation solution are prevented from reducing the dyeing capacity of the fibers,
This method effectively utilizes the dye adsorption rate to provide dark-colored artificial leather.

As the fiber constituting the base material of the present invention, it is necessary to use cationic dye-dyeable polyester or cationic dye-dyable polyamide. This is because polymers that are not dyeable with cationic dyes, are dyeable with disperse dyes, or are dyeable with acidic dyes are swollen by DMF, etc., but are not affected by metal ions in the coagulating liquid.

To obtain artificial leather with excellent texture and touch, 0.9
Although it is preferable to use fine fibers with a diameter of d or less, there are no particular limitations on the means for producing them. In general, in terms of reinforcing the strength of fine fibers, and since it is not necessarily easy to directly manufacture II III I, we first manufacture multi-component core-sheath composite fibers such as seabird type and mixed spun TLTLT1, and then mainly use non-woven fabrics and woven fabrics. After knitting, it is usually subjected to ultra-fine treatment.

Preferred examples of combinations of core-sheath type island components include combinations of 5-sodium sulfoisophthalate copolymerized polyester and polyethylene terethalate, or polybutylene terephthalate, or nylon 6°66, and sodium sulfobenzoic acid copolymerized nylon. A combination of polyester and polyethylene terephthalate, polybutylene terephthalate, or nylon 6.66 is preferable for improving the strength of products using fine fibers, but depending on the purpose and use, 5-sodium sulfoinphthalate copolyester alone or Um-sulfobenzoic acid copolymerized nylon alone may be used.

, On the other hand, suitable examples of the sea component include polystyrene, polyethylene, etc., and the island component polymer and solvent are different,
Moreover, the polymer is not particularly limited as long as it is a polymer that can be spun and made into yarn.

Nonwoven fabrics and woven and knitted fabrics can be produced using known means, and are not particularly limited.

From the viewpoint of the texture, surface quality, touch, drapability, etc. of the product, it is preferable to shrink or glue the nonwoven fabric or woven fabric before impregnating it with the binder solution.
This is not necessarily necessary in the present invention. Processing can be done depending on the purpose and use of the target product.

The ultra-fine treatment may be any treatment as long as it dissolves the component polymer used but does not dissolve the island component polymer.

In addition, this ultra-fine treatment is performed before impregnating with the binder solution.
Alternatively, it may be applied after impregnation and solidification.

In addition to the above-mentioned DMF, dimethylacetamide, diethylformamide, dimethylsulfoxide, hexamethylphosphoramide, and the like are used as the solvent having an affinity for water in the present invention.

The coagulation method of the present invention is a method in which a base material impregnated with a binder solution in coagulating water in which a sequestering agent is dissolved is crushed and solidified, or a binder solution in which a sequestering agent is added to a binder solvent is used as a base material. This method involves impregnation, then immersion in coagulation water, and coagulation.

Industrial water is generally used as coagulation water. In this water,
Calcium ion, magnesium ion.

Contains metal ions such as zinc ions and iron ions.

These metal ions tend to reduce the dyeing capacity in the fiber when the fiber surface is exposed to a high concentration of solvent and swells due to binder solution impregnation, and no matter how much metal ion sequestering agent is added during the dyeing process, color will not develop. The result is a product with low contrast and a striking color difference. In other words, this problem could not be solved using the known technique of adding in the conventional dyeing process. Impregnate the sheet with a solution type binder, 1
In the production of artificial leather by formula coagulation, adding it at the coagulation stage of the present invention is an important technique for improving color development.

The sequestering agent used in the present invention may be any compound that binds with metal ions in an aqueous solution to form a soluble complex salt and prevents metal ions from being precipitated by other reagents, such as condensation. Examples include phosphate, ethylenediaminetetraacetic acid, nitrilotriacetic acid, dihydroxyethylglycine, gluconic acid, citric acid, tartaric acid, and the like.

More specifically, the commonly commercially available [Frewat (
Teikoku Handmade>, Tetron (Kaisei Kagaku), Cheerion (Yamada), Solbin (Kamogawa Kagaku), etc. are used.

The addition m of the metal ion sequestering agent varies depending on the metal ion concentration in the water used for coagulation, but the effect of the present invention can be sufficiently obtained if it is 0.05a/Q to 5q/nalim in industrial purified water. Even if more than this is added, the effects of the present invention will not be lost; however, adding more than necessary may promote unevenness in the base material if there is uneven basis weight or thickness, and may also be advantageous in terms of cost. There is no.

Examples are shown next, but the effectiveness of the present invention is not limited or the interpretation thereof is limited by these. Rather, it brings about the next application exhibition.

[Examples] Example 1 Felt was made using three-component core/sheath type polymer mutual array fibers. Its composition and physical properties were as follows.

Island component (core component): 14.25 parts by weight of polyethylene terephthalate Island component (N component): 42.75 parts by weight of 8.5-sodium sulfoisophthalate units. Owt%/Polyethylene terephthalate sea component including total acid component = 43 parts by weight Polystyrene m Fiber length and fineness: Approximately 51aa+X3.8d Ken contraction number:
Approximately 15 threads/2.54 mm of felt was prepared. Two-needle punching method. Fabric weight: 560 Q/m' The felt was placed in boiling water, shrunk, squeezed with a mangle, and then dried.

Next, polyvinyl alcohol with a concentration of 121ffi% (partially saponified amount) was applied, and (approximately 43%/Island composite 4
allffi>, and thoroughly washed with t-reflor ethylene. Next, add a polyurethane DMF solution bath with a concentration of 14% by weight.
The metal ion sequestering agent (
After immersing in an aqueous solution (purified water) in which 0.50/fl of Flewatt N. Teikoku Kagaku was dissolved and coagulating, the glue was removed.
After washing with hot water and drying, it was sliced into about 1/2 and then puffed.

Then, it was stained under the following conditions.

Dye bath: Astrozon Gold Yellow
w Ql (cationic dye) 5.7%ovtfK
ayacryl Red GRL (cationic dye)
2.2%owfK ayacryl 31ue
G RL (cationic dye) 10.6%owf
Acetic acid 0.50/m Sodium acetate 0.2 g/α Bath ratio 1:50 Dyeing temperature/time 80°C, 20 minutes 100°C, 40 minutes Washing after dyeing 57:]-/L/PSK 2. OQ/Q (Kaisei Chemical anionic surfactant cleaning agent) bath ratio
1:5゜Processing temperature and time: 60℃ for 20 minutes.No metal ion sequestering agent is added to the coagulation solution for hot-water-washed and water-dyed products.
Compared to products made under the same conditions, the texture and touch were similar, but the color was deep (black), clear, and very immersive.

Example 2 Using the same m-thread as shown in Example 1, using a base material treated under the same conditions as in Example 1 up to the process of de-sea treatment with trichlorethylene, in a polyurethane [) MF solution at a temperature of 14fflffi%. A metal ion sequestering agent (Frewat N (Teikoku Kagaku)) of 0.5a/1 (to DMF) was added to the fibers in an amount of 49% by imaginary amount based on the weight of the fiber M, and then immersed in an aqueous solution (purified water). After solidification, the glue was removed, washed with hot water, and dried. I sliced it into 1/2 and puffed it.

Next, it was dyed under the same conditions as in Example 1. This product is DM
Compared to a product made without adding a sequestering agent to F and under the same other conditions, it was extremely superior in color (black) and clear. Moreover, it had the same level of color development as Example 1.

[Effects of the Invention] According to the present invention, it is possible to produce uniform artificial leather that can be dyed in m-colors while maintaining high fiber strength.

Claims (1)

[Claims] A sequestering agent is added to the coagulating liquid or binder solution when impregnating a non-woven fabric or woven fabric using cationic dyeable fibers with a binder dissolved in a solvent that has an affinity for water and performing wet coagulation. A method for producing artificial leather capable of deep dyeing, which is characterized by the step of solidifying the dyed material.