JPS6028581A - Light fastness improvement of aromatic polyamide 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 dramatically improving the light resistance of aromatic polyamide fibers. In particular, it relates to the field of clothing that requires light properties.

PRIOR ART Fully aromatic polyamides are known to be suitable for a wide range of applications. Aliphatic polyamide (e.g. nylon)
It has a higher softening point and melting point than nylon (6, 6, etc.), and has heat resistance such as strength retention at high temperatures, morphological stability, and thermal decomposition.

Not only does it have excellent flame resistance and flame retardancy, but it also has chemical resistance,
It has highly desirable physical and chemical properties such as electrical properties as well as mechanical properties such as strength and Young's modulus,
Suitable for applications such as heat-resistant, flame-retardant, flame-retardant fibers, high-strength, high-Young's-modulus fibers, and film forming materials. For example, a motor.

It is widely used in applications such as electrical insulating materials such as transformers, industrial applications such as filter bags and heating tubes, and other textiles where aesthetic elements are not required. On the other hand, textile fibers, for which fashionable colors are considered important, are mainly used as heat-resistant safety clothing, such as aviation uniforms and firefighting work uniforms. Furthermore, by blending and interweaving rayon, cotton, wool, etc., we add functions such as sweat absorption, moisture absorption, and heat retention to the high functionality of aromatic polyamide, creating sportswear that can be worn even under heavy duty clothing. , and plans are being made to expand into the field of comfortable clothing. As above,
Light resistance has traditionally been a major barrier to development in the clothing field.

(Objective of the Invention) The object of the present invention is to obtain a fabric having excellent light resistance while maintaining as much as possible the excellent properties of aromatic polyamide fibers.

Conventionally, in order to improve the light resistance of aromatic polyamide fibers, there is a method of mixing ultraviolet absorbers during dyeing, but since this fiber is inherently difficult to dye, the diffusivity of the ultraviolet absorbent within the fibers is low and the results are satisfactory. can't get it. Further, even if a carrier is used as an adsorption promoter, the ultraviolet absorber is not sufficiently introduced into the fiber, and no effect of improving light resistance is observed.

In view of the current situation, the present inventors have studied a method for improving the light resistance of aromatic polyamide fibers more effectively than before, and have arrived at the present invention.

(Structure and operation of the invention) That is, the present invention is "a method for improving the light resistance of aromatic polyamide fibers, which is characterized by heat-treating aromatic polyamide fibers in the coexistence of urea and thiourea."

The aromatic polyamide fiber in the present invention consists of repeating units represented by the general formula. In the above general formula, R, R, , & may be the same or different and are selected from hydrogen atoms and alkyl groups having 5 or less carbon atoms. Carbon number 5
Examples of the alkyl group below include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, etc., but preferably a hydrogen atom.

Further, Art l Art + Art may be the same or different, and are selected from the general formula % formula % (5).

In the general formula (or (2), -X- is →-I Sl
Published by -. In general formula (31, (4)) -Y- is →
-2? I (represents an alkyl group of 3 or less) -Y- is preferred 1.
(→-, -s+, -C- are selected, but more preferably -. In the general formula (1+, f2+ + (5), Ar and Ar' may be the same or different.
Selected from coaxially oriented aromatic rings. Aromatic rings with coaxial or parallel axes orientation and I- are, for example, 1,4-phenylene groups, l
, 3-phenylene group, 4.4'-biphenylene group, l,
It can include 5-naphthylene K, 216-naphthylene group, 2,5-pyridylene group, etc., but preferably <
is selected from a 1,4-phenylene group and a 1,3-)ecosine group.

Examples and 1 of preferred aromatic polyamides used in the present invention
．． polyamide consisting of, polyamide consisting of, polyamide consisting of, polyamide consisting of, -NH-
(IJ) I-...25 molty cobe◇-co-...Polyamide consisting of 50 molty, Published by Tobe)-...50 molty cobe→-co- ・...Polyamide consisting of 50 moles/shichi, 14 kai 41 song...Polyamide consisting of 50 moles, -NH+-...30 moles cobe◇be〇-... I can list polyamides made of 30 moles.

In addition, the benzene ring in the skeletons (1) to (5) and the above-mentioned aromatic ring residues include, for example, /'% 1lffgen group (e.g., chlorine, bromine, heptadol), lower alkyl group (
Methyl, ethyl, isopropyl, n-propyl group), lower alkoxy group (methoxy, ethoxy group), cyano group,
Acetyl group 1 =) P group etc. may be included as a substituent.

Hereinafter, a method for applying a mixture of urea and thiourea to aromatic polyamide fibers will be described in detail.

It is effective in improving light resistance only when urea and thiourea coexist, and no effect is observed when treated with urea or thiourea alone. When applying a mixture of urea and thiourea to an aromatic polyamide fabric, it is effective whether it is applied in the form of a powder or a solution, but when applying it in a solution form, it must be padded and then mangled. It is applied to the fabric by squeezing or using a spool, and then dried.

When applied in solution, the concentration of the urea and thiourea mixture can range from 1 to 100 parts by weight, particularly preferably from 20 to 80 parts by weight. Also, the mixing ratio (weight ratio) of urea and thiourea is 80:20 to 20:8.
Although it is effective in the range of 0, a particularly remarkable effect is observed at a ratio of 70:30 to so:so. The pH of the solution may be within the range of 3 to 10. The drying temperature may be within the range of 80 to 130°C. Next, heat treatment (curing) is performed, and the curing conditions are at a temperature of 160°C.
~210℃.

The processing time is 30 seconds to 5 minutes. Particularly preferably 18
02190°C for 1-2 minutes. Under conditions more gentle than this, the effect of improving sidelight properties is small, and under conditions more severe than this, the aromatic polyamide fiber turns brown [1] and the texture becomes hard, making it unsuitable for practical use.

The aromatic polyamide of the present invention may be an aromatic polyamide made of a polyamide copolymer having a functional group having affinity with dyes in the polymer chain. In this way, 8
The effect of the present invention is particularly great when an aromatic polyamide with improved dyeability due to component 63 is used. Ami 7
This is thought to be because the group inactivation reaction takes place more effectively inside the fiber.

In addition, the aromatic polyamide fiber targeted by the present invention may be an undyed product (vj@-111 fiber after setting) (ionic dyes such as acid dyes, cationic dyes, or disperse dyes,
It may also be dyed with a nonionic dye such as thren dye. Furthermore, it may contain colored pigments. In addition, the present invention does not only utilize aromatic polyamide fibers alone, but also blends with other synthetic fibers (fibers made of polyester, aliphatic polyamide, vinyl chloride, etc.), natural fibers, semi-synthetic fibers (cotton, rayon, wool, etc.), It can also be applied to fiber structures mainly containing aromatic polyamide fibers, such as fiber structures formed by interweaving.

Hereinafter, the present invention will be specifically explained with reference to Examples.

Examples 1-6. Comparative Examples 1 to 3 Plain woven fabrics (30 count twin yarn spun yarn, basis weight 200 f!/rr?) made of polymetaphenylene inphthal 7 mid fiber (Konex: Teijin ■ product) were woven at the weight ratios shown in Table 1. Mix urea and thiourea 1. After padding with an aqueous solution containing 30 wt% C dissolved in water and reaching a stand-up rate of 80 cm using a mangle, the temperature was increased to 100 cm.
It was dried at ℃ for 4 minutes. Then cure at 190℃ for 1 minute. Ta. The light resistance of the obtained treated fabric was measured and shown in Table 1.
It was shown to.

As Comparative Examples 1 to 3, 10% water (Comparative Example 1), urea alone (Comparative Example 2), and thiourea alone (Comparative Example 3) are shown in Table 11C.

Light resistance is determined using a fade meter, and is divided into 5 grades, with no fading after 40 hours of irradiation (best) being grade 5, and extremely severe fading (worst) being grade 1. It was determined that

Table 1 Example 7 and Comparative Example 4 (nl/n = 50/50) expressed in repeating units, fineness 1soode/1oo.

11 Aromatic poly(3°4'
- diphenyl ether terephthalamide) copolymer fibers were twisted together (15oO/2') and S-twisted at LIOT/10w. The twisted yarn was padded in an aqueous solution containing 60 parts of urea and 40 parts of thiourea dissolved at a concentration of 30%, and squeezed with a mangle to a pick-up rate of 80%.
It was dried at 00°C for 4 minutes. Then, cure at 190°C for 1 minute. The light resistance of the obtained treated fabric was measured and shown in Table 2.
It was shown to. In addition, Comparative Example and I-te water xoo% (Comparative Example 4
) are also shown in Table 2.

Table 2 Example 8 and Comparative Example 5 Du Pant KEVLAR-29, 1500de was treated in the same manner as in Example 2, and the light resistance was measured. Table 3 shows the results. In addition, Table 3 also shows the comparative example and the case of 100 g of water (comparative example 5).

Table 3 Procedural Amendment 1, Indication of Case Patent Application No. 1983-135202 2, Name of Invention Method for Improving Light Resistance of Aromatic Polyamide Fiber 3, Person Making Amendment Relationship with Case Patent Applicant 1, Minamihonmachi, Higashi-ku, Osaka City 11-chome (300) Teijin Ltd. Representative Sashibe Okamoto +11 On page 10, line 8 of the specification, insert the following sentence between "Good." and "The drying temperature is..." insert.

"If the pH is less than 3 or more than 10,
Decomposition of urea or thiourea occurs. (2) On page 12, line 8 of the specification, the statement ``Gushita.''
Insert the following sentence between and "Obtained...".

r pH was 6.5 in Examples 1 to 6. In Comparative Example 1, 7.
0. In Comparative Examples 2 and 3, it was adjusted to 6.5. (3) The statement on page 14, line 11 of the specification: "Nearing was carried out."
Insert the following sentence between and [Obtained...].

r pH in Example 7 was 6,5. In Comparative Example 4, it was adjusted to 7.0. (4) On page 15 of the specification, @line 3, insert the following sentence between the statements "The results are shown in Table 3" and "As a comparative example..."

[pll is 6.5 in Example 8. 7.0 in Comparative Example 5
Adjusted to. (5) On page 12 of the specification, after line 16, insert the following sentence from line 17 onwards.

"An experiment was carried out under the same conditions as in Example 3, except that the pH of the aqueous solution containing urea and thiourea was changed to 5 or 9. As the pH adjuster, acetic acid was used when the pH was 5, and soda carbonate was used when the pH was 9. The light resistance of the obtained treated fabric was 3.stl, which was good as in Example 3.

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Claims (1)

[Claims] A method for improving the light resistance of aromatic polyamide fibers, which comprises heat-treating aromatic polyamide fibers in the coexistence of urea and thiourea.