JPS609984A - Production of synthetic fiber having high dye fastness - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a method for producing synthetic fibers having high color fastness. [Technical Field] Synthetic fibers such as acrylic fibers, polyester fibers, and polyamide fibers are used for clothing, clothing, and clothing. .

Although it is widely used for industrial materials, dyed textile products are increasingly required to have a high degree of color fastness.

To address this issue, various studies are underway, including improvements in polymers, stretching, and heat treatment methods during the fiber manufacturing stage, the use of high-fastness dyes in the dyeing stage, and improvements in dyeing methods, but none have been fully satisfactory. It has not yet reached the stage it should be. One of the most important reasons for this is that fiber dyeing is carried out from the surface of the outer layer of the fiber, so a large amount of dye adheres to the outer layer, which is susceptible to external influences and imparts a high degree of color fastness. There are limits to that. The present inventors have completed the present invention as a result of intensive research to improve the problems related to the color fastness of such fibers.

[Purpose of the invention]

The main object of the present invention is to obtain dyed synthetic fibers having a high degree of color fastness, with no or little loss of color fastness in conventional washing and rubbing fastness tests.

[Structure of the invention]

The present invention provides a method for producing synthetic fibers with high color fastness, which comprises impregnating a dyeing solution into the hollow portion of a hollow synthetic fiber, removing the dyeing solution adhering to the surface of the outer layer of the fiber, and then subjecting the fiber to heat treatment. This is a summary.

A major feature of the method for producing synthetic fibers with high color fastness according to the present invention is that hollow synthetic fibers are used and the inner layer surface of the hollow synthetic fibers is dyed to impart high color fastness.

Therefore, the dyed hollow synthetic fiber obtained by the method of the present invention is
The dye is concentratedly attached or bonded to the inner layer, and the surface of the outer layer is hardly dyed with dye, so it is extremely difficult to be affected by external dyes and has a high degree of color fastness. It is.

The method for dyeing the surface of the hollow inner layer of the hollow synthetic fiber of the present invention involves first impregnating the hollow portion of the hollow synthetic fiber with a dyeing solution, and then removing the dyeing solution adhering to the surface of the outer layer of the fiber and heat-treating. This method is achieved by immersing the tip of the hollow synthetic fiber in a dyeing liquid and then subjecting it to vacuum and/or pressurization treatment to allow the dyeing liquid to be contained in the hollow portion of the fiber. In addition, as a method to remove the dyeing solution adhering to the fiber surface, after washing it with running water for a short time,
A method such as centrifugal dehydration can be used.

The hollow synthetic fibers used in the present invention are acrylic fibers and polyester fibers with a hollowness of 5% or more.

Synthetic fibers such as polyamide fibers. The degree of hollowness of the fiber is 5
%, the amount of dyeing solution that can be contained in the hollow portion is small, making it difficult to obtain a deep-colored dyed product.

The dyes and dyeing auxiliary agents used in the present invention can be used as they are in the dyeing process of textiles. Further, the concentration used may be appropriately set depending on the dark and light color of the intended dyed product.

By subjecting the hollow portion of the hollow synthetic fiber obtained by the above method to a fiber steaming treatment or dry heat treatment containing a dyeing liquid, the dye is diffused from the hollow inner layer surface of the hollow synthetic fiber toward the fiber outer layer surface. It is possible to obtain dyed fibers with excellent color fastness.

The heat treatment temperature in this case is suitably in the range of 80°C to 160°C. Further, the heat treatment time is suitably in the range of several minutes to several tens of minutes.

On the other hand, the moist heat treatment method is not preferable because the dyeing solution contained in the hollow fiber portion is eluted during the moist heat treatment process.

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

1. The hollowness and color fastness of the fibers described in the text were measured by the following method.

(1) Measurement of Hollowness of Fibers A cross-sectional section of the fibers is examined using a microscope, and the hollow area is expressed as a percentage of the total cross-sectional area of the fibers.

(2) Measurement of color fastness Measurement was performed according to the following JIS standard.

(a) Rubbing fastness JIS-L-0849 (1971) Mold method (b) Washing fastness JIS-L-0844 (1972) A-1 method (c) One-dimensional fastness JIS-L-0842 (1971) Example-1 The tip of a hollow acrylic fiber with a hollowness of 26% and a fineness of 15d was dyed with cationic dye Cathilon Blue K-G.
LH (manufactured by Mitsubishi Chemical Corporation) IOJ'/J, acetic acid 2//l.

Sodium acetate] After immersing it in an aqueous solution at 25°C containing J'/l, place it in a sealed container and place it in a mercury column -700iii+
The fibers were treated under reduced pressure for 5 minutes to allow the dye solution to be contained in the hollow part of the hollow fibers, and then taken out.

The fibers were washed with running water for 10 seconds to remove the dyeing solution adhering to the fiber surface, and then a centrifugal dehydrator was used.

The water adhering to the fiber surface was removed.

Subsequently, the fibers were steamed in saturated steam at 98° C. for 30 minutes, washed with water, and dried to obtain acrylic fibers dyed from the inner layer surface of the hollow fibers.

The color fastness of this fiber was measured in comparison with an acrylic fiber dyed in the same color from the surface of the outer layer of the fiber using the same dye by a conventional dyeing method, and the following results were obtained.

From this, it can be seen that the acrylic fibers dyed from the surface of the inner layer of the hollow fibers have a high degree of color fastness, with no decrease in fastness observed in normal washing and rubbing fastness tests.

Claims (2)

[Claims] (1) Synthetic fibers with high dye fastness characterized by incorporating a dyeing liquid into the hollow portion of the hollow synthetic fiber, removing the dyeing liquid from the outer layer surface of the fiber, and then heat-treating the fiber. Manufacturing method. (2) The method according to claim 1, wherein the heat treatment is a steam heat treatment or a dry heat treatment method.