JPS61194280A - Treatment of polyamide fiber product - 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 (Industrial Field of Application) The present invention relates to a processing method for increasing the processing power of polyamide fiber products.

(Prior Art) Polyamide fibers have been widely used in various fields due to their various advantages that natural fibers do not have. However, with recent technological innovations and diversification of requirements, more advanced functionality has been added and production conditions have been streamlined, leading to the development of polyamide fibers with different performances. Among these polyamide fibers, low-drawn polyamide fibers generally have a very fast dye exhaustion rate during dyeing, and on the other hand, their dye fastness and wet fastness are often extremely low. Are known. For example, the reality is that even if these are dyed with acid dyes and then subjected to dye fixing treatment in accordance with conventional methods, there is almost no improvement in washing fastness. That is, the internal structure of such polyamide fibers is in a relaxed state compared to polyamide fibers that have been subjected to a regular drawing process, and their physical properties exhibit behavior similar to non-oriented, undrawn yarns. For example, they have a common problem, such as a decrease in Young's modulus and melting point, but the wet B fastness of the dyed product is extremely poor.

(Problems to be Solved by the Invention) The present invention provides excellent color fastness with sufficient durability for practical use for polyamide fibers with low orientation, for which conventional dye fastness has not been improved at all. The present invention provides a processing method that can impart the following effects.

(Means for Solving the Problems) The present invention provides a method for dyeing low-stretch polyamide 4m textiles with ionic dyes and then subjecting them to dye fixing treatment, in which the concentration of tannic acid used is higher than 6% OWF, and the tartaric concentration is 3% OWF
It consists of a method for treating polyamide Jil textile products, characterized in that the treatment is carried out under higher conditions, each at a temperature below 60°C.

The low-stretched polyamide fiber as used in the present invention refers to a polyamide fiber that has a property of high dye desorption property, and here, dye desorption property means that it is colored in an acid dye dyeing bath at a temperature of at least 50 °C or less, but at a temperature of 50 °C or less. This refers to the phenomenon in which the dye significantly falls off during a washing test.

I will do it.

Acidic dye CI, No, Acid Blue 260 was allowed to stand for 24 hours in a desiccator placed in a thermostatic chamber at a temperature of 20 ± 2°C, then 0.005g was accurately weighed, and the mixture was placed at a temperature of 4°C.
Add 10,100 O of distilled water at 0±2°C to dissolve and prepare a dye liquor.

The textile dye was kept at constant humidity under the same conditions as above, and 1000 μl was precisely weighed, and 100 mj of the above dye solution (bath ratio 1:
100) and immersed for 60 seconds at a temperature of 40±2° C., and then 20 ml of the dyed residual liquid was collected.

The dyed residual solution is kept at room temperature 20 ml along with 20 ml of the dye solution before dyeing.
After being left in a constant temperature room at ±2° C. for 2 hours, the absorbance at a wavelength of 625 nm is measured using a spectrophotometer, and the exhaustion rate (%) of the dye is determined using the following formula.

Absorbance of pre-staining dye solution On the other hand, the shedding property of the dye is determined by washing fastness test according to JIS-L-0844.

In the present invention, the dye exhaustion rate is 20% or more,
Furthermore, polyamides whose color change and fading (change in color from the hue before washing) in a washing fastness test are lower than grade 3 are referred to as low-stretch polyamide fibers.

Such low-stretch polyamides include, for example, nylon 6, nylon 66, nylon 6101, nylon 11, and nylon 1.
Aliphatic polyamides such as 2 or polyhexamethylene isophthalamide, polyhexamethylene terephthalamide,
It can be manufactured by being composed of a monopolymer or copolymer such as aromatic polyamide such as polyxylylene adipamide, or a mixed polymer thereof.

Such low oriented polyamide fibers are dyed with ionic dyes. Among these, in the method of the present invention, it is preferable to dye with acid dyes, direct dyes, and reactive dyes. The method of the present invention (f) is characterized in that it can impart a good fastness enhancement effect to these dyed products.The degree of requirement of the present invention for imparting such an effect is higher than 6% OWF, preferably 8%.
-20% OWF and the treatment temperature is 60° C. or lower, preferably 50° C. or lower, for immersion treatment.

If the processing temperature is 60° C. or higher, no improvement in wet fastness can be obtained even if the concentration of tannic acid used is increased. Furthermore, if the amount of tannic acid used is less than 6% owF, the effectiveness is low.

The effects of the present invention are not as good as the conventional polyamide fibers with good orientation, that is, those with a dye exhaustion rate of 20% or less as defined in the present invention. A peculiar phenomenon occurs. That is, dyed polyamide fibers that have undergone sufficient stretching treatment have an optimum treatment concentration and treatment temperature of tannic acid fixation treatment of 2 to 3.
%owF is in the range of 75-85°C, whereas the optimum processing temperature for low-stretch polyamide m fibers is 20-4°C.
It has become clear that there is a major difference in that the temperature is in the extremely low temperature range, which is more than 0 degrees Celsius.

However, in the method of the present invention, the treatment temperature may be substantially the same as that for tannic acid treatment, that is, 60° C., and the concentration of tartar used is approximately half that of tannic acid, that is, higher than 3% OWF. was found to be suitable.

As an example of specific treatment conditions of the present invention, a dyed article is treated in a bath containing 6 to 20% OWF tannic acid and 1 to 3% OWF acetic acid at 60°C or lower for 15 to 30 minutes, followed by tartar An example of this is to perform the treatment at 60° C. or lower for 10 to 20 minutes under conditions where the concentration is higher than 3% OWF and 10% 0WFJJ.

Another feature of the present invention is that because the tannin treatment is not carried out at high temperatures as in conventional methods, the dye does not fall off in the tannin/tartar treatment bath, and the brown pigment of tannic acid itself is adsorbed to the dyed material. The low-temperature treatment of the present invention exhibits an excellent effect in that the phenomenon peculiar to tanning treatment, in which the hue of the dyed product becomes dull and the texture is roughened, does not occur at all in the low-temperature treatment of the present invention.

The low-drawn polyamide fibers used in the method of the present invention include ultrafine fibers with a diameter of 1 denier or less, and mixtures of these fibers with other fibers, but ultrafine TA fibers with a diameter of 1 denier or less are particularly preferred.

The form of the SM textile product used may be thread, cotton, woven fabric, knitted fabric or non-woven fabric. In particular, nonwoven fabrics made of ultrafine fibers are preferably used.

Next, the present invention will be specifically described with reference to Examples.

(Example) Example-1 A web was produced at a spinning speed of 3900 m/min using a polymer array consisting of nylon 6 as the island component and polystyrene as the sea component, with an island-to-sea ratio of 70,730 and 16 islands. Had made. The web was subjected to water flow constriction using high-pressure jet treatment to form a sheet, which was then treated with trichlorethylene to remove sea components. The obtained long fiber nonwoven fabric had a single fiber fineness of 0.11 denier and a basis weight of 70 g/m. This nonwoven fabric is CI,
N (+ Acid Red 114.8% OWF, acetic acid 2%
OWF, Newbon MG (Level dyeing agent manufactured by NICCA Chemical Co., Ltd.) 5%
Dyeing at 98°C for 60 minutes in a dye bath containing OWF (bath ratio 1:
50) Rinse with water. The dyed material was then treated with tannic acid.

Tannic acid is used at a concentration of 3.6.10.15.20.2
5° to 30% OWF, and acetic acid was added to each 2% OWF.

The treatment conditions were a temperature of 40°C, a time of 20 minutes, and a bath ratio of 1:50. Thereafter, the tartarite was treated with 1/2 amount of tannic acid at 40°C for 20 minutes (bath ratio 1:50) and washed with water.
Dry.

The washing fastness test was carried out by the Jl5-L-0844 Roundmeter method (stone fi 0.5%, 50°C for 30 minutes).

The results are as follows.

Note: Liquid fading indicates the degree of color fading into the washing liquid.

From the results in the table above, the tannic acid concentration was 6 to 20%.The dye exhaustion rate of this nonwoven fabric was measured using the measuring method of the present invention and was 30.5%. By the way, the result of a similar measurement on a fabric made from conventional nylon thread (using nylon manufactured by Toshi Co., Ltd., single thread denier 1.5 d) was 12.1.
% dye exhaustion rate.

The spectrophotometer used was a Hitachi model 228 double beam spectrophotometer. Furthermore, the color fading caused by washing this dyed product was grade 1.

Example 2 According to Example 1, the relationship between tannic acid treatment temperature and washing; ■ fastness was investigated. 10% OWF was used as tannic acid, the tartaric acid concentration was 5% OWF, and the treatment temperature was the same.

From the above results, it can be seen that if the processing temperature is high (indeed, the hue change due to solid color after washing becomes large), it was found that a suitable processing temperature is 60°C to 20°C.

Example 3 The fabric of Example 1 was dyed in each hue according to a conventional method. Fixation treatment is tannic acid 10% OWF, acetic acid 2
%OWF at 30℃ for 20 minutes, followed by 5%O
After adding WF and treating at 30° C. for 20 minutes, it was washed with water and dried. The treated fabric was tested for fastness to washing, side light (JIS-L-0842), and machining III (JIS-L-0849).

For comparison, the same dyed material was treated with tannic acid 3% OWF and acetic acid 2% OWF for 30 minutes at 80°C, and then treated with tartarite 1.5% OWF at 70°C for 20 minutes. compared to things. The results are shown in the table below.

From the above table, it can be seen that the method of the present invention is extremely effective in improving washing fastness. It has become clear that conventional high-temperature tanning treatments do not provide any practical washing fastness.

(Effects of the Invention) The method of the present invention can significantly improve the washing fastness of low-stretch polyamide fibers with a low degree of fiber orientation.

According to the present invention, it is possible to achieve vivid and durable dyeing of low-oriented polyamide, which was previously thought to be impossible.

Claims (3)

[Claims] (1) When performing dye fixation treatment after dyeing low-stretch polyamide fiber products with ionic dyes, the tannic acid concentration is higher than 6% OWF and the tartarium concentration is higher than 3% OWF, respectively, at 60°C or lower. A method for processing polyamide fiber products, characterized by processing at a temperature of . (2) The processing method according to claim 1, wherein the low-stretch polyamide fibers are ultrafine fibers of 1 denier or less. (3) The treatment method according to claim 1 or 2, wherein the low-stretch polyamide fiber product is a nonwoven fabric.