JPH045787B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method of treating modified polyester fibers, and more particularly to a method of treating polyester fibers to prevent pilling. Polyester fibers have excellent physical properties that natural fibers such as cellulose fibers and wool do not have, such as excellent dimensional stability, wrinkle resistance, strength and elongation, and are therefore widely used for clothing, industrial materials, etc. However, due to its high strength and elongation, pilling tends to occur especially when short fibers are used for clothing.
It has a defect that significantly impairs the appearance quality and feel. The tendency for pilling to occur differs depending on the texture, and although it is usually not so noticeable in plain woven fabrics, it is particularly noticeable in twill woven fabrics, satin woven fabrics, and knitted fabrics, making commercialization difficult. Conventionally, various proposals have been made for preventing pilling of polyester fibers. Pilling prevention methods can be broadly divided into methods that treat fabrics with synthetic polymers to prevent single fibers from being pulled out of tissues;
A method is known in which the fiber strength is lowered during the fiber manufacturing stage or post-processing so that even if pilling occurs, it will fall off immediately like natural fibers. However, the former method not only suffers from structural limitations and changes in texture due to the addition of synthetic polymers, but also has insufficient durability, making it impractical. Therefore, the latter method has mainly been proposed. However, if the strength is lowered by lowering the degree of polymerization at the fiber manufacturing stage, there will be quality and operational problems due to frequent yarn breakage during spinning, and productivity will be reduced due to the inability to increase the spindle rotation speed due to decreased spinnability during spinning. There is a limit to the reduction in the degree of polymerization because of the drawbacks such as reduction in the degree of polymerization, and it is impossible to obtain satisfactory pilling prevention. In particular, the effect is completely insufficient for high value-added products such as twill weave, satin weave, and raised products thereof, which are prone to pilling. On the other hand, as a method for preventing pilling by reducing the degree of polymerization during post-processing, for example,
Many methods using amines and acids have been proposed, such as that disclosed in Japanese Patent No. 33-247. However, the reality is that none of them have been put into practical use due to lack of efficacy or drawbacks arising from the drugs used. That is, even in the case of amines that have a particularly strong anti-pilling effect, a large amount of amine is usually required to obtain the desired anti-pilling effect.
This not only causes problems such as odor and discoloration, but also has drawbacks such as poor reproducibility of effects. The present inventors have arrived at the method of the present invention as a result of intensive research in order to solve the above-mentioned drawbacks and obtain a good pilling prevention effect without any reduction in productivity during fiber production and spinning processes. That is, the present invention provides an alkylene terephthalate polyester comprising a sulfonic acid metal base-containing ester-forming component (A) and a sulfonic acid metal base-free ester-forming component (B) other than the alkylene terephthalate component as copolymerization components, A fiber made of alkylene terephthalate polyester containing 1 to 6 mol% of component (A) and 3 to 20 mol% of component (A) and component (B) in total based on the acid component is used as a PH buffer. This is a method for treating modified polyester fibers, which is characterized by carrying out a wet heat treatment in the presence of a surfactant and a pH of more than 4 and less than or equal to 6. According to the method of the present invention, it is possible to obtain excellent pill resistance and soft texture with good reproducibility under mild conditions without the above-mentioned drawbacks. To explain the treatment method of the present invention in detail below, the polyester fiber used in the present invention includes an acid component mainly (80 mol% or more) of terephthalic acid or its ester-forming component, ethylene glycol, tetramethylene glycol, 1,4
- An alkylene terephthalate polyester obtained from a glycol component mainly composed of a glycol component such as cyclohexanedimethanol (80 mol% or more), in which the sulfonic acid metal base-containing ester-forming component (A) is A modified polyester fiber obtained by spinning, stretching, and optionally heat-treating a polyester containing 1 to 6 mol% and a total of 3 to 20 mol% of component (A) and additional components (B) other than the above. be. Sulfonic acid metal base-containing ester-forming component (A)
as 5-sodium sulfoisophthalic acid,
Sulfosuccinic acid, 4-sulfonaphthalene-2,7
In addition to acid components such as -dicarboxylic acid and 5[4-sulfophenoxy]isophthalic acid, glycols containing sulfonic acid metal bases, etc.
Sodium sulfoisophthalate is preferred. In addition, as the additional component (B), isophthalic acid,
Acid components such as adipic acid, sebacic acid, glutaric acid, diethylene glycol, dipropylene glycol, dibutylene glycol, polyether glycols with a molecular weight of less than 1000, especially the general formula []
Examples include glycols shown in . but,
Particularly preferred are isophthalic acid and/or glycols represented by the general formula []. HO(CiH ₂ iO−) _n RO−(CjH ₂ jO−
) _o H...[] (wherein, R is a divalent hydrocarbon group having 4 to 20 carbon atoms,
m and n are the same or different integers, 1≦m+n≦
15, i, and j are integers from 2 to 4) If component (A) and component (B) deviate from the above range, especially below the lower limit, the desired anti-pilling properties may not be obtained under the mild treatment conditions of the present invention. On the other hand, if the upper limit is exceeded, the physical properties of the fiber will deteriorate, it will be difficult to control the processing conditions, and the anti-pilling properties will vary. The additional component (B) is 2 mol % or more, and may be produced by causing glycol condensation in the polycondensation step. In addition, the intrinsic viscosity of the modified polyester fiber (phenol/tetrachloroethane 6/4 weight ratio, 30°C
) is preferably about 0.35 to 0.6. Specific examples of R in the above formula [] include, for example, a linear aliphatic hydrocarbon group such as -(CH ₂ -) ₆ ;

A side chain like [formula] an aliphatic hydrocarbon group having

A hydrocarbon group having an aliphatic ring such as [Formula],

Examples include aromatic hydrocarbon groups such as [Formula]. Furthermore, the product may not only be a product of modified polyester fiber alone, but also a product of a mixture of modified polyester fiber and other fibers. The textile products may be yarns, fabrics, napped, rugs, tapes, sewn products, or the like. The surfactants used in the present invention include commonly used surfactants, such as sulfuric esters of higher alcohols, sodium alkylbenzenesulfonates, anionic surfactants such as Marcel soap, and alkyl surfactants of polyalkylene oxides. or a series of nonionic surfactants such as aryl derivatives. The amount used is usually preferably about 0.1 to 5 g/. Surfactants improve process uniformity and enhance effectiveness. Furthermore, the processing liquid used in the present invention
As adjusting agents for adjusting the pH to more than 4 and less than 6, commonly used formic acid, acetic acid, propionic acid,
Monocarboxylic acids such as stearic acid, oxalic acid,
Examples include polycarboxylic acids such as tartaric acid, succinic acid, and adipic acid, and inorganic acids such as hydrochloric acid, nitric acid, sulfuric acid, and phosphoric acid. In addition to these, a PH buffer is also used. From the viewpoint of reproducibility of the treatment, it is preferable to adjust the treatment solution so that the pH of the solution after treatment is also 4 to 6. The processing conditions include immersion in the processing solution for 70 to 100 minutes.
Treat at ℃ for about 10 to 90 minutes or soak in the treatment solution.
Steaming is performed at 90 to 120°C for several minutes to several tens of minutes, and the former immersion method is particularly preferred. In addition, an antifouling agent such as a polyester/polyoxyalkylene glycol block copolymer may also be used in the treatment liquid. The present invention will be explained below with reference to Examples, but the present invention is not limited to the Examples. Example 1 Ethylene terephthalate-based modified polyester copolymerized with penta-sodium sulfoisophthalic acid at a ratio of 4.0 mol % based on the total acid components and diethylene glycol at a ratio of 2.5 mol % based on the total glycol components, spun and stretched. A 30 ^′ jersey knitted fabric was knitted using polyester fiber. This knitted fabric was treated in the treatment bath shown below at 90°C for 30 minutes, dried, and finished after intermediate setting. (Treatment liquid) Ultra MTKT-2 (Seijima Kagaku Kogyo Co., Ltd., condensed phosphate) 0.3g/ Neugen HC (Daiichi Kogyo Seiyaku Co., Ltd., nonionic surfactant) 0.5g/PH4.0-4.2 Obtained knitted fabric The anti-pilling properties of the products were evaluated and the results are shown in Table 1.

[Table] By the method of the present invention, a knitted fabric product with a soft texture and good pill resistance was obtained. Example 2 R in the general formula [] is a 2,2-dimethylpropylene group, the glycol component of m + n = 4, ij = 2 is 2 mol % based on the total glycol component, and 5 sodium sulfoisophthalic acid is based on the total acid component 1/30 ^'s (modified polyester fiber 50%/
(50% cotton) 28G jersey fabric knitted. Thereafter, it was bleached according to a conventional method, and then treated with an aqueous treatment solution having the following formulation at a bath ratio of 1:50 at 90°C for 30 minutes, washed with water, and dried. (Treatment liquid) Ultra MT KT-2 0.3 g/ Neugen HC 0.5 g/ PH4.0-4.2 The pill resistance of the obtained knitted product was evaluated and the results are shown in Table 2.

[Table] By the method of the present invention, a knitted fabric product with a soft texture and good pill resistance was obtained. Comparative Example 1 100% modified polyester fiber used in Example 2
A 30 ^'s 28G cotton jersey was treated with an aqueous treatment solution having the following formulation at a bath ratio of 1:50 at 90°C for 30 minutes, then washed with water and dried. (Treatment liquid) Acetic acid (80%) 0.8g/Noigen HC 0.5g/PH4.0-4.2 The anti-pilling property of the obtained knitted fabric product was evaluated and the results are shown in Table 3.

[Table] By the method of Comparative Example 1, a knitted fabric product with a soft feel and good anti-pilling properties was obtained, but a problem was observed in the uniformity of performance. Example 3 30 ^'s blended yarn of modified polyester fiber and cotton used in Example 2 (50% modified polyester fiber/50% cotton)
A 28G jersey fabric was knitted. After bleaching according to the usual method, use an aqueous treatment solution with the following formulation at a bath ratio of 1:
After processing at 50°C and 90°C for 60 minutes, it was washed with water and dried. (Treatment liquid) Acetic acid (95%) 0.2cc / Sodium acetate 0.2cc / Neugen HC 0.5g / SR-1000 (Takamatsu Yushi Co., Ltd., polyester antifouling agent) 0.5g / PH4.2-4.5 Obtained knitted fabric product The anti-pilling properties were evaluated and the results are shown in Table 4.

[Table] By the method of the present invention, a knitted fabric product with an extremely soft feel and excellent pill resistance was obtained. The antistatic and antifouling properties were also good.

Claims (1)

[Claims] 1. Sulfonic acid metal base-containing ester-forming component
(A) and sulfonic acid metal base-free ester-forming components other than alkylene terephthalate constituents
An alkylene terephthalate polyester containing (B) as a copolymerization component, with a content of 1 to 6 mol% of the component (A) based on the total acid component, and a total of 3% of the component (A) and the component (B).
A modified polyester characterized by subjecting a fiber made of an alkylene terephthalate polyester containing ~20 mol% to a wet heat treatment under conditions where the pH is greater than 4 and less than or equal to 6 in the presence of a pH buffering agent and a surfactant. Fiber processing methods. 2. Claim 1, wherein component (B) is at least one selected from isophthalic acid, adipic acid, sebacic acid, glutaric acid, diethylene glycol, dipropylene glycol, dibutylene glycol, and polyether glycol having a molecular weight of 1000 or less. Process for treating modified polyester fibers described in Section 1.