JPH054472B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for dyeing synthetic polyamide fabrics. More specifically, the present invention relates to a method for dyeing fabrics made of synthetic polyamide fibers, particularly belts, with improved level dyeing properties, durability, and light resistance.

The synthetic polyamide fabric that is the subject of the method of the present invention refers to a fabric that has stronger twists and weaves than ordinary fabrics, is stiffer, or has a larger thickness, and has a woven structure such as a plain texture or twill texture. is not limited to. For example, nylon belts are mainly used for industrial materials, and are widely used as hanging belts for container bags, safety belts for automobiles, safety belts for working at high places, and the like.

Nylon belts are mainly dyed by the padded steam method, but because the substrate is thick and the weaving is difficult, internal penetration of the dye solution and uniform heating to the inside is insufficient, and the dyeing time is slow. Not only does it take a long time, but it also tends to cause uneven color and density. For this purpose, level dyeing type acid dyes and disperse dyes are often used as dyes. However, in terms of light fastness and washing fastness required for its use, even after post-processing, it is not possible to obtain sufficiently satisfactory functions, and nylon belts using disperse dyes cannot be used with other rubberized fabrics. However, it has drawbacks such as the tendency for dye to migrate to synthetic resin bags and the like. In addition, attempts have been made to consider the use of metal complex dyes as dyes that have excellent light fastness and washing fastness, and are resistant to transfer to other fabrics, but the disadvantage of metal complex dyes is that they have low solubility in water, so they cannot be used in high concentrations. Not suitable for dyeing,
In addition, it has problems such as poor dye transferability and a tendency to cause color unevenness, so it has not been widely used.

The present inventors have conducted extensive research to improve the above-mentioned drawbacks of dyeing nylon belts, and as a result they have arrived at the present invention.

That is, an object of the present invention is to provide a new continuous dyeing method for nylon belts that is advantageous in workability and economy, and to obtain nylon belts that have excellent level dyeing properties and extremely high light fastness and washing fastness.

Its construction consists of applying an aqueous dye solution containing a water-soluble metal complex dye and 20 to 100 g/dimethyl sulfoxide to a belt made of synthetic polyamide fibers, followed by continuous dyeing by steaming.

The dye solution used in the present invention is an aqueous solution containing a metal complex dye and dimethyl sulfoxide (hereinafter abbreviated as DMSO).
Auxiliary agents used in dyeing synthetic polyamide fibers,
For example, leveling agents, solubilizing agents, and the like may be added to the extent that they do not impede the purpose of the present invention. Metal complex dyes are soluble azo dyes in which dye molecules and metal ions such as chromium, cobalt, nickel, and copper are combined in the form of complex salts. means,
The structure includes o,o'-dihydroxyazo, o-hydroxy-o'-aminoazo, and o-hydroxy-o'-aminoazo, which have complex salt forming ability.
Preferred are 2:1 type complex salt dyes which have an o-hydroxy-o'-carboxyazo structure and can be dyed in a weakly acidic to neutral bath. Specifically, for example, Neolan dye, Platin Fast dye, Irgalan
dyes, Lanyl dyes, Kayakalan dyes, etc.

Metal complex dyes can be dissolved in water using conventional methods, but
The amount and concentration of the liquid are not particularly limited. It is sufficient to have a liquid volume and concentration that is advantageous for continuous dyeing.
A concentration of ~100g/ is preferred. DMSO is colorless;
It is almost odorless, nontoxic, and noncorrosive, so it can be used safely and can be added to an aqueous metal complex dye solution in any proportion to form a homogeneous solution. The amount of DMSO that best exhibits the effects of the present invention is 100 to 300% by weight based on the metal complex dye, and preferably 20 to 50 g/based on the amount of water. Particular attention should be paid to the fact that a concentration of 100 g/concentration or more in water is not only unnecessary, but may also have an undesirable effect on the post-treatment of the nylon belt.

The method of the present invention will be explained below using the drawings. FIG. 1 is a side sectional sketch of an example of the dyeing apparatus used in the present invention.

An undyed nylon belt 1 is immersed in a dye solution in a dye solution tank 2 and squeezed by a mangle 3. Any method of applying the dye can be applied to the method of the present invention, such as the dip nip method using the apparatuses 2 and 3, the dye liquid foam coating method, the dye liquid spray method, or the application of the dye liquid by textile printing.

The nylon belt 1 coated with the dye liquid is then introduced into the steam treatment chamber 4. The nylon belt 1 to which the dye liquid has been applied is rapidly heated in a steam treatment chamber 4 by saturated steam.

Allow the dye to remain on the nylon belt for the necessary time. The nylon belt 1 with dye fixation completed is washed in a commonly used washing tank 5 in the usual manner.
The undyed dye is removed in the washing tank, and if necessary, an antistatic agent, softener, etc. are applied in the last tank of the washing tank, and then the product is led to the drying room 6 and dried.

The present invention has the above-mentioned structure, and according to the method of the present invention, a nylon belt with excellent level dyeing properties without light color or uneven dyeing on the surface, and extremely high light fastness and washing fastness can be produced. Obtainable.

Next, the present invention will be explained by examples, but the present invention is not limited thereto.

Example 1 When continuously dyeing a nylon belt, it was padded with the following padding recipe and the pick-up rate was 30%.
I narrowed it down to

Packaging recipe Lanyl Yellow GR e/c 25.0g Lanyl Brilliant Blue BLW 4.5g Lanyl Black RW 1.5g DMSO 50.0g Acetic Acid 0.5g Mix the dye and DMSO thoroughly and add 500g of hydrothermal solution to dissolve. Add more water to bring the total volume to 1 liter, and add acetic acid. It is preferable to add acetic acid just before starting dyeing.

Then, after staying in a saturated steam chamber (100°C) for 10 minutes, the mixture was washed with water and dried as usual. A uniformly olive-dyed belt was obtained. The light fastness and washing fastness were each grade 5.

Comparative Example 1 In Example 1, during padding prescription
Staining was carried out in exactly the same manner as in Example 1 except that DMSO was removed. As a result, uneven dyeing, specks, etc. occurred on the surface of the nylon belt.

Example 2 When continuously dyeing a nylon belt, it was padded with the following padding recipe and the pick-up rate was 30%.
I narrowed it down to

Patiding recipe Lanyl Yellow GR e/c 25.0g Lanyl Brilliant Blue BLW 4.5g Lanyl Black BG e/c 1.0g DMSO 50.0g Acetic acid 1.0 Mix the dye and DMSO thoroughly and add about 500g of hot water to dissolve. Add more water to bring the total volume to 1 liter, and add acetic acid. It is preferable to add acetic acid just before starting dyeing.

Then, after staying in a saturated steam chamber (100°C) for 10 minutes, the mixture was washed with water and dried as usual. A uniformly olive-dyed belt was obtained. The light fastness and washing fastness were each grade 5.

Comparative Example 2 In Example 2, during padding prescription
Staining was carried out in exactly the same manner as in Example 1 except that DMSO was removed. As a result, uneven dyeing, specks, etc. occurred on the surface of the nylon belt.

Example 3 A belt uniformly dyed brown was obtained in the same manner as in Example 1 except for the padding recipe as follows.

Patsudaying prescription Lanyl Brown 3BO 20.0g DMSO 40.0g Vinegar acid 1.0 The volume was made up to 1 liter with water.

Example 4 A belt uniformly dyed black was obtained in the same manner as in Example 1 except for the padding recipe as follows.

Patsudaying prescription Aminyl Black FGL 40.0g DMSO 40.0g Vinegar acid 1.0g The volume was made up to 1 liter with water.

[Brief explanation of drawings]

FIG. 1 is a side sectional sketch of an example of the dyeing apparatus used in the present invention. 1, 1', 1'' are nylon belts. 2 is a dye bath. 3 is a mangle. 4 is a steam treatment chamber. 5 is a washing tank. 6 is a drying chamber.

Claims (1)

[Claims] 1. A belt made of synthetic polyamide fibers, characterized in that a dye aqueous solution containing a water-soluble metal complex dye and 20 to 100 g/dimethyl sulfoxide is applied to the belt made of synthetic polyamide fibers, and then the belt is continuously dyed by steaming. dyeing method.