JPS636185A - Dyeing of heat resistant aramid fiber - 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 (Field of Industrial Application) The present invention relates to a method for dyeing heat-resistant aramid fibers or cotton blends thereof.

More specifically, the present invention relates to a method of attaching a dye to a heat-resistant aramid fiber or a cotton blend thereof and irradiating it with infrared rays to dye it.

In recent years, there has been an increasing demand for flame retardancy, particularly in the field of textile products, and in response to this demand, flame retardant materials have been developed. These materials require coloring just like other textiles.

(Prior Art) Flame-retardant materials have a high melting point and high flame retardancy, and have a dense fiber structure, making it extremely difficult to dye them. Many dyeing methods have been studied so far for dyeing such heat-resistant fibers. However, most of them are carrier dyes or solvent dyes using special organic solvents such as acetophenone.

(Problem to be solved by the invention) The dyeing method using carriers and special organic solvents as described above cannot be said to be an appropriate dyeing method from the viewpoint of preserving the working environment and the surrounding environment. This is not a practically satisfactory method because the exhaustion of ing.

However, heat-resistant fibers, especially aromatic polyamide-based heat-resistant fibers, have high crystallinity and a dense structure. However, practical dyeing was difficult.

For this purpose, the above-mentioned carrier dyeing and solvent dyeing methods involve adding highly scratchy carriers and special organic solvents such as acetophenone, and dyeing in batches. This is a major problem in dyeing factories and the like, as the addition of such chemicals causes a strong odor and poor workability.

The problem of the present invention is to continuously produce heat-resistant aromatic polyamide fibers or their cotton mixtures at a practical concentration without using carriers or special organic solvents such as acetophenone that adversely affect the working environment. The object of the present invention is to provide a method for dyeing.

(Means for Solving the Problems) The present inventors have made extensive studies to solve the above problems, and as a result, they have attached dyes to heat-resistant aramid fibers or their cotton-mixed products, and then They have discovered that by radiant heating with infrared rays, dyeing can be done to a practical density in a short period of time, and the present invention has been completed.

That is, the method of the present invention is a method for dyeing heat-resistant aramid fibers, which is characterized by attaching a dye to heat-resistant aramid fibers or their cotton-mixed products and irradiating the dye with infrared rays.

The heat-resistant aramid fibers that are the target of the method of the present invention are particularly suitable for -hanging age (+).The dyeability of this aromatic polyamide fiber is not fully known, and there is still no practically satisfactory dyeing method. Not provided.

As the dye used in the method of the present invention, water-insoluble dyes such as disperse dyes and vat dyes as well as cationic dyes can be used. Among these types of dyes, low-molecular and robust dyes are preferably used in the M1 scale.

The method for attaching such a dye to the fibers is as follows:
There are no particular limitations and various methods can be applied as long as the dye adheres uniformly to the fiber surface; generally known padding methods and printing methods are often used.

When such padding or printing methods are adopted, organic compounds having a swelling effect such as urea, triethanolamine, glycol, cellosolve, or aromatic or higher alcohols are added alone or together with the dye in the padding liquid or printing paste. It is preferable to mix and add a small amount.

The preparation of the padding bath and printing paste is not particularly limited, and may be prepared using JII in the same manner as in the case of polyester fibers.

After the dye is deposited on the fiber, it is usually dried by conventional methods. A drying temperature of about 80 to 130°C is sufficient.

Further, depending on the case, this step may be omitted.

Next, heat treatment is performed using infrared rays, which have a wavelength of 2 to 6 μm. For this irradiation, various infrared heaters capable of emitting infrared radiation of this wavelength can be used.

For example, CASSO5OLAR's far infrared heater "
Using equipment equipped with a solar heater, for example, a solar system manufactured by Daiwa Kikai Co., Ltd., the heater panel temperature is 5.
Infrared radiation heating methods of 00-1000°C can be used. During this process, the dye is absorbed and fixed on the fibers, creating color.

Next, as in normal dyeing, unfixed dyes, sizing agents, additives, and other substances remaining on the fibers are removed by a conventional washing method.

(Functions and Effects) Aromatic polyamide fibers with a dense structure and extremely difficult to dye can be dyed to a practically sufficient density by the method of the present invention.

Therefore, the aromatic polyamide fiber, which has various uses as a flame-retardant material, can be colored to meet the needs of a wide range of fields.

Furthermore, this dyeing method is highly productive and allows for mass processing.

That is, the method of the present invention makes it possible to dye newly developed useful heat-resistant fibers.

It has high industrial value.

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

Example l Miketone polyester pull TGSF (manufactured by Mitsui Toatsu Dye Co., Ltd. Disperse dye C, 1, D 1sperse B l
A disperse dye solution is prepared by mixing 40 parts of ue 214), 100 parts of urea, 1 part of sodium alginate as a migration inhibitor, and water to make 1000 parts. Using this disperse dye solution, pad a knitted fabric made of heat-resistant aramid fiber represented by the following formula C', squeeze it at a squeezing rate of 70%, and then dry it for 10 minutes using a hot air dryer.
Intermediate drying was performed at 0° C. for 80 seconds.

Next, we installed equipment equipped with an infrared heater (here, CASS
Using the "Solar System Model C~2-2J" made by Daiwa Machinery Co., Ltd., which is equipped with the far-infrared heater "Solar Heater" made by O5OLAR Co., Ltd., the heater panel temperature is kept at 800°C and the heater panel is continuously heated for 5 seconds. The dye was fixed by heat treatment with infrared radiation.Then, the dyed product obtained above was washed with water, and 2 parts of sodium hydroxide, 2 parts of sodium dithionite, and a nonionic surfactant were added to 1000 parts of water. Reduction cleaning is carried out for 101 minutes at approximately 80°C with a reduction cleaning solution containing 2 parts of the dye, followed by washing with water and drying.As a result, the dyed product is dyed in a deep and vivid blue color and is extremely durable. there were.

Comparative Examples 1 to 3 For comparison, instead of the heat treatment using infrared radiation in Example 1 of 011, a normal thermosol coloring method was used at 230°C.
1 minute dry heat treatment (Comparative Example 1) and normal 11. We tried high-temperature steaming treatment at 180°C for 10 minutes using the T,s coloring method (Comparative Example 2), but in both methods, the dyed products had poor coloring properties and a dull majestic color. It was contaminated, and nothing of practical use could be obtained. In addition, when Kone 7x I' fabric (aromatic polyamide heat-resistant fiber manufactured by Kijinsha Co., Ltd.) was used instead of the aramid fiber in Example 1 (Comparative Example 3), 11 vivid colors were obtained; It doesn't reach the concentration.

Example 2 Heat-resistant aramid fibers represented by the following formula (Ill) were used in place of the heat-resistant aramid fibers represented by formula (I■) in Example 1, and the rest was as in Example 1.
When treated under the same conditions as above, the dyed product obtained was dyed in a vivid blue color and was scratchable and fast.

Example 3 Instead of the disperse dye used in Example 1, Miketone Polyester Yellow YL (disperse dye C manufactured by Mitsui Toatsu Dyes Co., Ltd.) was used.
When 40 parts of 1, 1 sparse 42) were used and the other conditions were the same as in Example 1, the dyed product obtained was dyed in a vivid red color and was extremely durable.

Example 4 Miketon Polyester Pink RL Mitsui Toatsu Dye Co., Ltd. Disperse dye C, 1, Disperse Red 91
) 30 copies in small quantities! Make a paste with hot water A, then mix 100 parts of urea, 50 parts of benzyl alcohol, 550 parts of a mixed glue of 12x aqueous locust bean gum type paste and 4x aqueous carboxymethyl cellulose type paste, and water to make a mark of 1000 parts. Formula ([) using paste in Example 1
Printing was performed on a heat-resistant aramid fiber represented by the following formula, followed by intermediate drying in the same manner as in Example 1, followed by heat treatment with infrared radiation to fix the dye. Then, reduction cleaning was performed, followed by washing with water and drying. As a result, a dyed product was obtained in which the printed portion had a dark color and a clear red printed pattern.

Example 5 Eisencatylone-GL) I (Disperse Dye C, 1, Ba5icRed 69 manufactured by Udougaya Chemical Co., Ltd.) 20
20 parts of diethylene glycol, 15 parts of glacial acetic acid, and 100 parts of urea are poured into boiling water to completely dissolve the dye. Next, water containing 10 parts of tartaric acid is mixed to prepare a dye solution of 1000 parts. Thereafter, in the same manner as in Example 1, dye #4 solution was padded onto the heat-resistant aramid fiber represented by the following formula (IV).

Thereafter, the same intermediate drying treatment and infrared radiation heat treatment as in Example 1 were performed. Next, the obtained dyed product was washed with water, and soaped for 10 minutes at about 80 ° C. in a soaping bath containing 2 parts of Cysol 2E (anionic surfactant: Daiichi Kogyo Seiyaku Co., Ltd.) per 1000 parts of the aqueous solution. Washed with water and dried. As a result, the dyed product obtained was dyed in a deep and vivid red color and was extremely durable.

Claims (1)

[Scope of Claims] 1) A method for dyeing heat-resistant aramid fibers, which comprises attaching a dye to heat-resistant aramid fibers or a cotton blend thereof and irradiating the dye with infrared rays. 2) Claims that the heat-resistant aramid fiber is an aromatic polyamide fiber represented by the general formula (I) ▲Mathematical formula, chemical formula, table, etc.▼(I) (n is an integer indicating the degree of polymerization) The method described in paragraph 1. 3) The method according to claim 1, wherein the infrared rays have a wavelength of 2 to 6 microns. 4) The method according to claim 1, wherein the dye is a water-insoluble dye. 5) The method according to claim 1, wherein the dye is a cationic dye.