JPS5831437B2 - Method for improving the fastness of dyed products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for improving the light fastness of dyed textile products, and more particularly to a treatment for improving the light fastness of dyed textile products, particularly textile products made of natural or synthetic polyamides. Regarding the method.

Among the various fastness properties of dyed products, the most important are light fastness and washing fastness, and the phenomenon of light fastness in particular is extremely complex and it is difficult to improve it.

In addition, the light fastness of dyed products is particularly problematic for light colors including white and below, rather than for medium colors and above, and among these, it is more of a problem for clear hues than for unclear hues, and for light colors including white and below, light resistance is more problematic. The quality is extremely poor.

Conventionally, dyes that emit fluorescence even with low light fastness have been used to obtain vivid colors and high whiteness for fibers such as wool, which have low white charcoal and cannot be expected to be significantly improved by bleaching. However, due to their chemical structure and characteristics, these types of dyes are extremely sensitive to ultraviolet light.
It is easy to be influenced by it.

One way to improve light resistance in such cases is to use an ultraviolet absorber, but when a fluorescent dye and an ultraviolet absorber are used in combination, they cancel out each other's fluorescence, resulting in a significant decrease in sharpness. Antioxidants cannot improve light fastness, so it has been a long-held desire of dyeing engineers to improve light fastness without reducing brightness.
Furthermore, this is an important issue that has been desired commercially for many years.

The present inventors have arrived at the present invention as a result of intensive research into a method for improving the light fastness of dyed textile products, especially dyed textile products made of natural or synthetic polyamides, which do not have the above-mentioned drawbacks.

That is, the present invention improves the fastness of dyed textile products by treating them with a silane-based finishing agent having at least one reactive group selected from vinyl, acryloyl, and epoxy groups.

The method of the present invention has the advantage of improving not only light fastness but also washing fastness.

Furthermore, it has many performance and economical advantages, such as the fact that the fluorescent light is not canceled out or the hue is not blurred, and the processing method is simple and can be applied in a continuous process.

The reason why the light fastness is improved by the method of the present invention is unknown, but it is thought that the improvement in washing fastness is due to a decrease in the hydrophilicity of the dye due to the reaction between the dye and the silane-based finishing agent.

Examples of the silane-based agent having a reactive group used in the method of the present invention include the general formula % group, aryl group, lower alkoxyl group R3:C1,
Examples include processing agents represented by lower alkoxyl groups (R4: H, lower alkyl groups R5, R6: lower alkylene groups), and more specific examples include the following.

However, particularly preferred are vinyl group-containing silanes such as vinyltrichlorosilane and vinyltriethoxysilane.

These silane-based additives are used in the form of aqueous solutions, aqueous dispersions, organic solvent solutions, etc., but the concentration used is usually 0.
1 to 10% owf, and any treatment method such as dipping, banding, spraying, etc. may be used.

Although the treatment conditions differ somewhat depending on the treatment method, it is not necessary to apply strong heat during treatment, and it is usually immersed at 5 to 50 degrees Celsius, preferably room temperature, for several seconds to several hours, or immersed for a short time and then squeezed. Liquid drying is convenient.

The method of the present invention provides good fastness when applied not only to dyed products but also to fluorescently brightened products.

The method of the present invention is particularly preferably applied to natural or synthetic polyamide fibers, but other acrylonitrile fibers,
It can be widely applied to dyed textile products made of protein-acrylonitrile graft copolymer fibers, cellulose fibers, etc.

Furthermore, although the method of the present invention is particularly effective for dyeing with acid dyes and fluorescent brighteners, it is not necessarily limited to these dyes.

The present invention will be explained below with reference to Examples.

In addition, % in an example is weight %.

Example 1 Whole wool yarn was mixed with hydrogen peroxide solution (30%) 15 (f:, /
4 by an aqueous solution consisting of 1% sodium pyrophosphate
Bleach at 5°C for 5 hours, then bleach with 0.5% OWF of Whitex WS (manufactured by Sumitomo Chemical Co., Ltd., fluorescent dye), 0.004% OWF of Sulforhodamine G (manufactured by Hoechst Co., Ltd., acid dye) and 2% OWF of sulfuric acid. It was dyed with an aqueous solution at 90° C. for 20 minutes, washed with water, and dried.

A rib knitted fabric was knitted using the fluorescent whitening yarn thus obtained, and the following treatments were performed.

(1) Vinyltrichlorosilane aqueous solution pad (2% o
wf ), then dried at 90°C (method of the present invention) (2) After an aqueous solution pad of vinyltriethoxysilane (2% owf), 9
Dry at 0°C (method of the present invention) (3) Vinyltris (β-
methoxyethoxy)silane aqueous solution pad (2% owf)
) and then dried at 90° C. (method of the present invention) (4) Finished dyeing (no post-treatment) The light resistance of the obtained treated cloth was evaluated by irradiation with a fade-off for 10 hours. The results are shown in Table 1.

As a result, the method of the present invention almost eliminated dullness of hue and improved light resistance.

Example 2 Protein-acrylonitrile copolymer fiber (manufactured by Toyobo Co., Ltd., registered trademark Zinone) was bleached with an aqueous solution of thiourea dioxide 39/l, and then sulforodamine GO, 003% o
wf, Brancophor CL (manufactured by Bayer, fluorescent dye)
It was stained with an aqueous solution consisting of 1% owf 1 and acetic acid 2% owf at 90° C. for 60 minutes, washed with water, and dried.

The thus obtained fluorescent whitening fibers were immersed in the following treatment solution at room temperature for 5 seconds, squeezed to a squeezing rate of 80%, and dried at 90°C.

(1) 2.5% aqueous solution of vinyltrichlorosilane (method of the present invention) (2) 2.5% aqueous solution of vinyltriethoxysilane (method of the present invention) (3) 2.5% aqueous solution of vinyltrichlorosilane (method of the present invention) (3) 2. 5% aqueous solution (method of the present invention) (4) Finished dyeing (no post-treatment) The light resistance of the obtained treated cloth was evaluated by irradiation with a fade-off for 10 hours. The results are shown in Table 2.

As a result, by the method of the present invention, the dullness of the hue was almost eliminated and good light resistance was obtained.

Example 3 The dyed fabric of Example 1 was padded with a 2% aqueous solution of γ-glycidoxyprobyltrimethoxysilane and then heated to 90°C.
It was dried.

The light resistance of the obtained treated cloth was evaluated by irradiation with a fade-off for 10 hours. As a result, the light resistance was grade 2 and there was no dull hue.

Claims (1)

[Scope of Claims] 1. Dyed textile products are prepared using the general formula % formula % alkyl group, aryl group, lower alkoxyl group R3:
C1, lower alkoxyl group R4: H, lower alkyl group R, R6: lower alkylene group) A silane having at least one reactive group selected from a vinyl group, an acryloyl group, and an epoxy group in the molecule. A method for improving the fastness of dyed products, characterized by treating them with a dyed product.