JPH10266082A - Dyed polyester fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject fabric without staining the inside of a dyeing machine and without deteriorating the quality of the fabric by dyeing a fabric using high speed-spun polyester filament yarns with a disperse dye in an alkaline dyeing bath. SOLUTION: This dyed polyester fabric is obtained by subjecting a fabric using high speed-spun polyester filament flat yarns having a birefringence of 0.08-0.12 at least as warps to a desizing treatment, a souring treatment, and a presetting treatment and subsequently dyeing the treated fabric in a dyeing bath using a disperse dye and having a pH of 8.5-9.0 by the use of a liquid flow dyeing machine. The amount of oligomers adhered to the surface of the dyed fabric is thereby reduced to a range of 250-500 μg/g.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester fabric composed of filament flat yarns spun at high speed.

[0002]

2. Description of the Related Art In recent years, spinning take-off speed has been increased to 4000 m / m.
A high-speed spinning method has been developed and put into practical use for the purpose of improving productivity, in which a fiber having sufficient practical properties can be obtained without passing through a drawing step by setting the length to at least minutes. This high-speed spinning method includes an ultra-high-speed spinning method in which a yarn melt-discharged from a spinneret is directly withdrawn at a speed of 5,000 m / min or more, and once cooled and solidified, stretched and heat-treated while reheating in a heating atmosphere such as a hot tube. A hot-tube drawing spinning method of drawing at 4000 m / min or more, a direct spinning drawing method of drawing with a first take-up roll, drawing with a second take-up roll and drawing at 4000 m / min or more, and the like. .

[0003] Among them, the yarn obtained by the hot tube drawing spinning method has properties close to those of a so-called drawn yarn, which is a yarn produced by a conventional two-step method of spinning and drawing, and can be developed into a conventional drawn yarn. . On the other hand, the yarn obtained by the ultra-high-speed spinning method has good dyeing properties and has features such as softness due to small Young's modulus, but its physical properties and fiber structure are essentially different from those of conventional drawn yarns. It cannot be used as a substitute for yarn. The reason for this is that the initial yield point is lower than that of the conventional drawn yarn, and when used for the weft of a woven fabric, sink marks are likely to occur. Further, since the shrinkage rate is low, the tissue entanglement point at the time of passing through the staining step is finished with a looseness, which causes a problem of seam shift in the product. However, since the simplest process and low cost do not cause the above problems,
Alternatively, it is used for warp and raised knits of woven fabrics as a method utilizing characteristics that are not available in conventional drawn yarns. The yarn obtained by such an ultra-high-speed spinning method has an extremely low amorphous part orientation degree of about 30% as compared with the conventional drawn yarn, and oligomers present in the fiber at about 1.4 wt% are subjected to heat treatment during the dyeing process. Diffuses and moves to the fiber surface with the movement of the amorphous part. The oligomers diffused and transferred to the fiber surface are eluted into the high-temperature dyeing bath and reattach to the fiber surface upon cooling. These re-adhered oligomers degrade the quality of the fabric and become stains in the dyeing machine, adversely affecting the fabric to be subsequently processed.

[0004] Conventional dyeing baths have a pH of 4.5 to 6.0, and it has been impossible to suppress the reattachment of oligomers. As a method for removing the re-adhered oligomer, a cleaning method using ultrasonic waves proposed in Japanese Patent Application Laid-Open No. 48-73596 is also possible, but there are problems in terms of equipment, and practical use is required from the viewpoint of productivity. Was difficult. Also,
There is also a means to solubilize oligomers by reduction and washing under strong alkaline conditions using caustic soda and a surfactant. However, in this method, if the temperature conditions do not affect the hue and fiber strength, a low temperature of about 80 ° C. Conditions had to be adopted, which only led to very low oligomer removal properties.

[0005]

SUMMARY OF THE INVENTION In view of the background of the prior art, the present invention has been made without reducing the quality of a fabric.
Further, the present invention aims to provide a polyester colored fabric composed of high-speed spun filament flat yarn without stains in the dyeing machine.

[0006]

The present invention employs the following means in order to solve the above problems. That is, the polyester colored fabric of the present invention has a birefringence of 0.1.
A fabric constituted by using a filament flat yarn of 08 or more and 0.12 or less, characterized in that the surface oligomer adhesion amount of the fabric is 250 to 500 µg / g.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The present invention has been studied diligently with respect to the above-mentioned problems in the polyester colored fabric constituted by such a high-speed spun filament flat yarn, and found that an oligomer on the surface of the fiber of the polyester filament flat yarn constituting the fabric is used. 250-500 µg / g
The present inventors have sought to solve the problem at once by suppressing the problem.

In the present invention, a high-speed spun filament flat yarn having a birefringence of 0.08 or more and 0.12 or less has a large amount of oligomers generated, and the effect of the present invention is greatly affected. That is, such a filament flat yarn is a non-crimped yarn, a yarn made by a one-step method or a two-step method of sail spinning and drawing, and has a relatively low amorphous part orientation degree of 60 to 70%. Since the oligomer is difficult to diffuse and move to the fiber surface even during the heat treatment at the time of dyeing, the yarn melt-discharged from the spinneret is used as it is.
In the yarn obtained by the ultra-high-speed spinning method of drawing at a speed of 000 m / min or more, the amount of generated oligomer is large.

[0009] Those having a birefringence of less than 0.08 are not preferred because the degree of orientation of the polymer molecules is low, the mechanical properties of the fibers are insufficient, and the fibers cannot withstand the tension in the weaving process. On the contrary, those exceeding 0.12 cannot be obtained because spinning technology is originally difficult in the range of ultrahigh-speed spinning.

The polyester used in the present invention is preferably such that the main dicarboxylic acid component constituting the polyester is a terephthalic acid component, but other dicarboxylic acid components are used within a range not departing from the object of the present invention, or used in combination. You may. The main diol component constituting the polyester used in the present invention is preferably ethylene glycol, but other components, such as 1,4-butanediol, 1,6-hexanediol, 1,4-cyclohexanedimethanol, polyethylene glycol, and poly (ethylene glycol) A diol component such as tetramethylene glycol may be used or may be used in combination without departing from the purpose of the present invention. The polyester used in the present invention may contain various additives, such as a matting agent, a flame retardant, an antioxidant, an ultraviolet absorber, an infrared absorber, a crystal nucleating agent, a fluorescent whitening agent, and the like, as required. May be copolymerized or mixed.

The polyester is prepared by melt spinning.
The yarn drawn at 000 m / min or more may be either multifilament or monofilament. Also,
The fineness of the fiber yarn is not particularly limited.

The fabric referred to in the present invention is not particularly limited in its form such as a woven fabric, a knitted fabric or a non-woven fabric, but it is sufficient if at least the filament is used as the warp yarn, and more preferably, the weft is also a filament flat yarn. It is good to be composed. In addition, when cross-woven or cross-knitted with a processed yarn shape or false twist processed yarn, a decrease in surface quality due to oligomers tends to be less evident, but a structure in which filament flat yarn often appears as a floating yarn on the fabric surface, in particular, satin If the structure has such a surface glossiness, the decrease in surface quality due to the oligomer tends to be obvious.

[0013] The polyester colored fabric in the present invention is:
Dyed with a disperse dye, for example, 12
Dyeing is preferably carried out at 0 to 140 ° C., preferably with the pH of the dyeing bath being alkali side. Specifically, pH
Is 8.5 or more, the effect of the invention is great, but the pH is 9.
If the value is 0 or more, hydrolysis of the dye is caused, the possibility of hue change is high, and it is necessary to select a dye. Therefore, the range of pH = 8.5 to 9.0 where most dyes can be used is most preferable. . When the pH of the dyeing bath after dyeing becomes 8.5 or less, reattachment of oligomers is promoted.
It is preferable to control H to be in the range of 8.5 to 9.0.

[0014]

The present invention will be described in more detail with reference to the following examples. The following methods were used to determine the physical property values and oligomer attachment amounts described in the examples.

<Birefringence Δn> Measured by an ordinary method using a deflection microscope equipped with a Berek compensator. <Amount of oligomer attached> The amount of oligomer (μg / g) was quantified by extracting the oligomer from ethanol of the fixed amount of the dyed fabric with ethanol and using a high performance liquid chromatography method.

<Surface quality> Visual angle 45 with natural light in the warp direction
The difference in the quality when viewing the image at angles of 90 ° and 90 ° was visually judged.

Using the polyester filament yarns having different spinning speeds and birefringences shown in Table 1, the fabrics shown in Table 2 were woven by a water jet loom.

The fiber cloth is desizing and scouring, and is performed at 190 ° C. ×
Preset was performed for 28 seconds. Next, dyeing was performed using a liquid jet dyeing machine under the conditions shown in Table 3 at a bath ratio of 1:10 and a dyeing temperature of 130 ° C. for 30 minutes, followed by washing with hot water, washing with water, drying, and heat treatment at 170 ° C. for 28 seconds to finish. Table 4 shows the results of measuring the amount of oligomer attached to the fiber surface for each of the obtained fiber cloths.

[0019]

[Table 1]

[Table 2]

[Table 3]

[Table 4] Comparative Examples 2, 3 and 5 were washed with caustic soda: 2 g / l and surfactant excellent in oligomer removal property: Disparon ZX (manufactured by Takamatsu Yushi Co., Ltd.) at 1.0 g / l, and then reduced and washed at 80 ° C. after dyeing. Table 5 shows the results obtained by measuring the amount of surface oligomers of the obtained fiber cloth.

[0020]

[Table 5]

[0021]

As described above, the present invention provides a high-speed spun filament flat fabric which is manufactured by using a polyester filament flat yarn produced by a high-speed spinning method without deteriorating the quality of the fabric, and without staining in a dyeing machine. It is possible to provide a polyester colored fabric composed of yarn.

Claims (3)

[Claims] 1. A fabric comprising a filament flat yarn having a birefringence of 0.08 or more and 0.12 or less, wherein the surface oligomer adhesion amount of the fabric is 250-500 μm.
g / g polyester colored fabric. 2. The polyester colored fabric according to claim 1, wherein said fabric is constituted by using said filament flat yarn as at least a warp. 3. The polyester colored fabric according to claim 1, which is a disperse dye and is alkali-dyed.
The polyester-colored cloth according to the above.