JPH05302264A - Production of modified polyester fiber - Google Patents

Abstract

PURPOSE:To obtain a method for producing modified polyester fiber, excellent in color developing, deep color properties and hand such as soft and dry feeling and suitable for the field of sportswear, etc. CONSTITUTION:Polyester fiber containing 0.1-15wt.% potassium titanate powder having 0.1-3mum average diameter(D), 0.5-30mum average length(L) and 2-50 ratio (L/D) is subjected to weight reduction with an alkali so as to provide 2-30wt.% weight reduction ratio. Thereby, fine grooves are formed in the fiber axial direction on the fiber surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a modified polyester fiber which has excellent coloring and bathochromic properties and is excellent in soft feeling, dry feeling and the like.

[0002]

Polyester terephthalate typified by polyethylene terephthalate has many excellent properties and is widely used not only for silk-like woven and knit applications such as women's dresses and blouses, but also for sports clothing and the like. ing. However, polyester fibers generally have a very smooth surface, so that the reflectance of white light on the fiber surface is large, and the color of the dyed fiber is poor, for example,
Compared with natural fibers such as cotton, silk and wool, and regenerated fibers such as rayon, they have the drawback of being inferior in color clarity and depth. Moreover, the polyester fiber has a defect that the texture is hard.

Conventionally, in order to improve the bathochromic property, sharpness or texture when dyeing polyester fiber, soluble inorganic fine particles are contained in the fiber, and the inorganic fine particles are eluted by alkali treatment so that the surface of the fiber is A method of making microporous has been proposed. (Japanese Patent Publication No. Sho 59-24233, Japanese Patent Laid-Open No. Hei 2)
-300314, etc.). However, such surface-microporous polyester fibers contain fine inorganic fine particles and are eluted with an alkaline solution, so that the irregularities of the fiber surface are greatly affected by the particle size, shape and dispersibility of the inorganic particles, and large irregularities are present. When formed, there was a problem that the bathochromic property and the color developability were impaired.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to provide a method for producing a modified polyester fiber which has excellent coloring properties and bathochromic properties and is excellent in texture such as soft feeling and dry feeling. Is.

[0005]

The present invention is to solve the above-mentioned problems, and the gist thereof is that the average diameter D is 0.1 to 3 μm.
The polyester fiber containing 0.1 to 15% by weight of potassium titanate powder having an average length L of 0.5 to 30 μm and L / D of 2 to 50 is alkali-reduced so that the weight loss rate is 2 to 30% by weight. A method for producing a modified polyester fiber is characterized in that fine grooves are formed on the fiber surface in the fiber axis direction.

The present invention will be described in detail below. Polyethylene terephthalate and polybutylene terephthalate are typical examples of the polyester constituting the polyester fiber of the present invention, but aromatic dicarboxylic acids such as isophthalic acid and phthalic acid may be used as long as the effects of the present invention are not impaired. It is also possible to copolymerize aliphatic dicarboxylic acids such as adipic acid and dodecanedioic acid, aromatic diols such as bisphenol A, glycols such as trimethylene glycol, and hydroxycarboxylic acids such as p-hydroxybenzoic acid.

The potassium titanate powder used in the present invention has an average diameter D of 0.1 to 3 μm and an average length L of 0.5 to 30 μm.
It is necessary that m / L and L / D are 2 to 50.
When D is less than 0.1 μm, the width of fine grooves on the fiber surface generated after weight reduction is narrow and shallow, so sufficient coloring and bathochromic effects cannot be obtained. On the other hand, when D is more than 3 μm, the alkali weight is reduced. In that case, the strength of the fiber is significantly reduced.
Also, when L is less than 0.5 μm, sufficient fine grooves are not developed in the fiber axis direction when the alkali weight is reduced, and the desired dry feeling or the like cannot be obtained. The pack pressure rises and there is a problem in operability. Furthermore, when the L / D is less than 2, when the alkali weight is reduced, sufficient fine grooves are not developed in the fiber axis direction, and the desired texture such as dry feeling cannot be obtained. When the amount is reduced, the strength of the fiber is greatly reduced.

The amount of potassium titanate powder contained in the polyester fiber should be 0.1 to 15% by weight. If this amount is less than 0.1% by weight, sufficient color developability, bathochromic property and soft feel, dry feel and the like cannot be obtained.On the other hand, if it exceeds 15% by weight, guides, etc. are formed during spinning, drawing, weaving, knitting. There is a problem that the strength of the fiber is greatly deteriorated when the fiber is worn and the amount of alkali is reduced.

The potassium titanate powder may be blended with the polyester at any stage before spinning, for example, a method of directly mixing the potassium titanate powder and the polyester during spinning and melt spinning, or preliminarily preparing the potassium titanate powder. A method of melt spinning a mixture of polyester and a kneader such as a kneader may be used.

The spinning and drawing may be carried out by a conventional method using a conventional polyester melt spinning apparatus and drawing apparatus. In addition, during spinning, additives such as a stabilizer, a fluorescent agent, a pigment, and a reinforcing agent may coexist.

In the present invention, the polyester fiber containing the potassium titanate powder is alkali-reduced to form fine grooves on the fiber surface in the fiber axis direction, but the alkali weight reduction rate may be 2 to 30% by weight. Required, especially 10 ~
It is preferably 25% by weight. If the alkali weight loss rate is less than 2% by weight, sufficient fine grooves are not developed in the fiber axis direction, and the desired dry feel or the like cannot be obtained. On the other hand, 30% by weight
If it exceeds, there is a problem that the strength of the fiber is greatly reduced.

Alkali weight loss treatment can be carried out by a conventional method, and the conditions vary slightly depending on the type of polyester fiber, but in an aqueous solution of 2 to 600 g / l of sodium hydroxide,
The treatment may be performed at a bath ratio of 1: 100 at room temperature to 100 ° C. for a time (about 5 to 100 minutes) at which the target weight loss rate is achieved.

The polyester fiber in the present invention is suitable to have a single yarn fineness of 10 denier or less, preferably 5 denier or less, and the cross-sectional shape is not limited to a circular cross section but may be a modified shape such as a triangular cross section.

[0014]

The potassium titanate powder in the present invention has a needle-like shape, and is kneaded into polyester and spun into the filtration filter without stagnation even when spun, so that the pack pressure does not increase, Moreover, since the shape at the time of addition is maintained, it is possible to generate fine grooves for the purpose of developing the desired function and texture by reducing the alkali. And, the polyester fiber obtained in the present invention expresses elongated grooves in the fiber axis direction due to alkali weight loss, and is thus recognized as having excellent texture such as bathochromism, bathochromicity and soft feeling, and dry feeling. Be done.

[0015]

EXAMPLES Next, the present invention will be specifically described with reference to examples. The method of measuring the characteristic value is as follows. (a) Intrinsic viscosity [η] Measurement was carried out at a temperature of 20 ° C using an equal weight mixture of phenol and ethane tetrachloride as a solvent. (b) Bathochromic property and color developability The bathochromic property and color developability were evaluated by sensory evaluation in five levels. The best case is 5th grade, the worst case is 1
It was evaluated as a grade. (4th grade or above is acceptable.) (C) Feeling Soft feeling and dry feeling were judged by 8 levels by sensory evaluation. The case where these are the best was evaluated as the 8th grade, and the worst case was evaluated as the 1st grade. (Both grades are grade 5 or above.) (D) Strength of fiber Tensilon UTM-4-100 type manufactured by Orientic Co., Ltd.
It was measured at a sample length of 10 cm and a pulling speed of 10 cm / min.

Example 1 Polyethylene terephthalate having an intrinsic viscosity of 0.71 was D = 1 μm.
10% by weight of potassium titanate powder having m 2 and L = 20 μm was added, and the mixture was melt-kneaded using a twin-screw extruder to be made into chips. After drying the chips well, spinning temperature 290 ℃, spinning speed
It was melt-spun at 1400 m / min and wound up to obtain an undrawn yarn having a circular cross section. The obtained undrawn yarn was drawn and heat-treated at a drawing speed of 700 m / min and a draw ratio of 3.5 times while being brought into contact with a hot plate at 160 ° C. between a supply roller and a drawing roller at 80 ° C. The obtained yarn is twisted to 300 T / M, glued at 30 ° C, dried at 85 ° C, warped, woven, relaxed and scoured with hot water at 97 ° C, and final heat-fixed at 160 ° C. To create a twill fabric. Subsequently, this fabric was alkali-reduced with a 5 g / l sodium hydroxide aqueous solution at 70 ° C. so that the weight loss rate was 20% by weight, and then dyed with a disperse dye. It had chromaticity. In addition, as a result of sensory evaluation, soft and dry feelings were good.

Examples 2 to 13 and Comparative Examples 1 to 9 In Example 1, potassium titanate powders D and L,
The same procedure as in Example 1 was performed except that the addition amount and the alkali weight loss rate were changed.

The results of Examples 1 to 13 and Comparative Examples 1 to 9 are summarized in Table 1.

[0019]

[Table 1]

[0020]

EFFECTS OF THE INVENTION According to the present invention, since it can be easily processed by the conventional equipment and can be manufactured at low cost, it is excellent in economical efficiency, and has excellent coloring property, bathochromic property, soft feeling, and dry feeling. It is possible to obtain a modified polyester fiber having an excellent texture. The modified polyester fiber obtained by the present invention can be suitably used for applications requiring a bathochromic property, a coloring property, a soft feeling and a dry feeling in the field of sports clothing and the like.

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location D01F 6/92 306 B 7199-3B // D06M 101: 32

Claims (1)

[Claims] 1. An average diameter D of 0.1 to 3 μm and an average length L of
Polyester fiber containing 0.5 to 30 μm and 0.1 to 15% by weight of potassium titanate powder having L / D of 2 to 50 is alkali-reduced so that the weight loss rate is 2 to 30% by weight, and the fiber axis is formed on the fiber surface. A method for producing a modified polyester fiber, which comprises forming fine grooves in a direction.