JP2000226749A - Antistatic polyester spun yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antistatic polyester spun yarn having excellent antistatic property and dyeable to in all colors including color by spinning polyester staple containing specific antistatic core-sheath conjugate polyester fiber. SOLUTION: This polyester-based spun yarn is formed by blending at least 20 wt.% of an antistatic core-sheath type conjugate fiber comprising 0.2-3 wt.% of an antistatic agent obtained by mixing a polyetheramide with 1-10 wt.% based on the polyetheramide of RSO3M [R is an 8-15C alkyl; M is alkali (earth) metal and preferably Na] into a core component based on whole conjugate fiber, 0.6-10 wt.% of delustering agent and a weight ratio of the delustering agent to the antistatic agent is 0.3-2.0, and having <=5×1010 Ω.cm specific resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spun polyester yarn having good antistatic properties and capable of being dyed in all colors including white.

[0002]

2. Description of the Related Art Polyester fibers are widely used because of their excellent physical and chemical properties. However, static electricity is apt to be generated.

[0003] For this reason, a polyester antistatic technology has been conventionally proposed. For example, the method of kneading an antistatic substance improves durability as compared with post-processing, but has a problem of frosting. Therefore, as means for improving the drawbacks associated with imparting antistatic properties, a number of methods utilizing composite spinning technology have been proposed.

For example, JP-B-44-905 and JP-B-44-911 disclose a block polyetheramide having an unmodified polyester disposed at the core of a conjugate fiber and having an antistatic property at a sheath. A technique for distributing a mixture of block polyetheramide and polyamide is disclosed. However, there was a problem that could not be solved by this technology.
These problems can be summarized as fusing between fibers, peeling of the core component and the sheath component, poor light fastness, and the like. Further, Japanese Patent Publication No. 52-31450 discloses that by disposing a thermoplastic polymer containing conductive carbon black as a core component,
There have been proposals to improve antistatic properties. Although the antistatic property is remarkably improved by this technique, coloring is unavoidable because black carbon black is used, so that it cannot be used for general use.

In order to further improve this drawback, Japanese Patent Laid-Open No.
Japanese Patent Application Laid-Open No. 122020 and Japanese Patent Application Laid-Open No. 55-128017 propose that a specific amount of a block polyetheramide having a high antistatic property is blended. Although these technologies have improved both antistatic performance and coloring, it has not been possible to produce free colors in applications with high fashionability, for example, for women.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and provides a spun polyester yarn which can provide a sufficient antistatic performance and can freely select a color which can correspond to fashion. It is in.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to substantially consist of a polyester fiber having a specific resistance of 5 × 10 ¹⁰ Ω ·
cm or less, wherein at least 20% by weight or more of the spun yarn is a core-sheath composite polyester fiber containing an antistatic agent in a core component, which can be achieved by an antistatic polyester spun yarn. .

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The polyester fiber constituting the spun yarn of the present invention is a polyester having a fiber-forming property containing terephthalic acid as a main acid component. Specifically, polyethylene terephthalate, polyethylene terephthalate / isophthalate copolymer, polyethylene terephthalate / 5-sodium sulfoisophthalate copolymer, polycyclohexane dimethylene terephthalate,
Polytetramethylene terephthalate, polytetramethylene terephthalate / isophthalate copolymer, and the like. In addition, a more preferable polyester is mainly composed of polyethylene terephthalate.

In order to achieve the object of the present invention, the spun yarn must have a specific resistance of 5 × 10 ¹⁰ Ω · cm or less. If the specific resistance of the spun yarn exceeds 5 × 10 ¹⁰ Ω · cm, sufficient antistatic properties cannot be exhibited when the woven fabric is used. The lower the specific resistance is, the more preferable it is.
× 10 ¹⁰ Ω · cm or less, particularly preferably 3 × 10
⁹ or less.

The antistatic fiber constituting the spun yarn has a core component containing 0.2 to 3.0% by weight of an antistatic agent based on the entire composite fiber.
It is preferred that it is blended.

According to the knowledge of the present inventors, the antistatic property of the woven fabric varies depending on the basis weight, the woven structure, and the like. However, the antistatic property of the woven fabric is set to 2.0 kV or less. It is preferable to mix the antistatic agent in an amount of 0.2% by weight or more. If it is less than 0.2% by weight, sufficient antistatic properties may not be obtained depending on the basis weight and woven structure of the woven fabric. On the other hand, when the antistatic agent is added in an amount of more than 3% by weight, the antistatic property is improved, but the excellent physical properties characteristic of the polyester fiber tend to deteriorate, and the more preferable range is 0.4% to 2.%. 0% by weight, and a particularly preferred range is 0.5 to 1.2% by weight.

The antistatic performance is determined by the amount of the antistatic agent with respect to the whole fiber. From the viewpoint of the spinning property, the amount of the antistatic agent to be added to the core component is 2.0 to 5 with respect to the core component. It is preferably 0.0% by weight.

The antistatic agent to be compounded is not particularly limited.
It is preferable to use a block polyetheramide having a large antistatic effect. The polyether constituting the block polyether amide is a polyalkylene ether, such as polyethylene ether, polypropylene ether,
And a polymerization product of ethylene oxide and / or propylene oxide such as polyethylene propylene ether.

The polyamide constituting the other is a homopolymer or a copolymer synthesized by a monomer capable of forming a polyamide and a combination thereof, for example, nylon 6, nylon 8, nylon 1
2, polyamides such as nylon 66 and nylon 610, and copolymers such as nylon 6 and nylon 66 may be used, but are not particularly limited thereto.

The molecular weight of the polyether is preferably at least 1,000, more preferably at least 200, from the viewpoint of antistatic performance.
0 or more, and the polyether is preferably polyethylene glycol. From the viewpoint of antistatic properties, the ratio of the polyether in the block polyether to the total weight of the polymer is preferably 20% by weight or more and 75% by weight or less, more preferably 30% to 70% by weight. The relative viscosity of the ether amide is preferably 1.9 to 3.1. (1 g of the polymer was dissolved in 100 g of orthochlorphenol and measured at 25 ° C.) The antistatic property was further improved by using R-SO ₃ M as the antistatic agent together with the antistatic agent. . R-SO ₃ M
The mixing ratio of the block polyetheramide is 1 to
10 wt% is preferred. Here, R is an alkyl group having 8 to 15 carbon atoms, and M is an alkali metal or an alkaline earth metal, of which Na is preferred.

The mixing ratio of the matting agent of the core component is 0.6 to
It is preferably 10.0% by weight. In particular, when the antistatic agent is colored, by blending a large amount of the matting agent, the effect of reducing the coloring of the antistatic agent on the fiber surface is great. When the compounding ratio of the matting agent of the core component is less than 0.6% by weight, the effect of reducing the coloring of the antistatic agent is small. On the other hand, if the compounding ratio of the matting agent exceeds 10.0% by weight, a dull feeling is observed even from the fiber surface, and it is difficult to obtain a clear color even by dyeing the fiber. A preferred black dyeing L value is 16 or less.
Therefore, a more preferable compounding ratio of the matting agent of the core component for exhibiting the coloring reduction effect of the core component and obtaining a sufficient clear color is 1.0 to 3.0% by weight, particularly preferably 1.
5 to 2.8% by weight.

Although the coloring of the core component is affected by the thickness of the sheath component of the fiber, even if the coloring state of the core component is the same, it can be reduced by increasing the thickness of the sheath component. The thickness of the sheath component is preferably 1.5 μm or more. More preferably, it is 2.5 μm or more, further preferably 3 μm or more.

Further, in order to develop a clear color development of the fiber, it is preferable that the matting agent incorporated in the sheath component is less than 0.8% by weight. Increasing the amount of the matting agent in the sheath component contributes to reducing the influence of coloring of the core component, but undesirably decreases the sharpness of the dyed fiber. In that sense, when the matting agent is 0.8% by weight or more, clearness cannot be obtained. More preferably 0.5% by weight
And more preferably less than 0.4% by weight.

Further, by increasing the antistatic agent, the antistatic performance is improved, and by increasing the matting agent, the coloring of the core component can be reduced, but the sharpness is reduced. In order to satisfy both, the ratio of the matting agent in the core component to the antistatic agent in the core component should be 0.3 to 2.
Preferably, it is set to zero. A particularly preferred ratio is 0.
4 to 0.8.

As described above, it is preferable that the YI value representing the whiteness is 15 or less because the fibers are not colored as much as possible, so that each color can be dyed freely, including white.

The spun yarn of the present invention must contain at least 20% by weight of the above-mentioned antistatic polyester core-sheath conjugate fiber. If it is less than 20% by weight, the antistatic performance of a fabric such as a woven fabric is insufficient. Preferably, the content is 40% by weight or more. A particularly preferred range is 50% by weight or more.

The spun yarn of the present invention can be produced, for example, as follows. 2.5% by weight of titanium dioxide
Polyester obtained by blending 3.54 parts by weight of an antistatic agent and 0.2 part by weight of an antioxidant with 3.5 parts by weight of a block polyetheramide to 100 parts by weight of the blended polyethylene terephthalate was used as a core component. The core / sheath composite fiber was made of substantially non-copolymerized polyethylene terephthalate containing 0.4% by weight of titanium dioxide. At this time, the weight ratio of the core / sheath component was set to 20/80.

The undrawn yarn is wound at a rate of 3.2 times, stretched at a constant length of 180 ° after the drawing, and then cut into 38 mm after being crimped by a push-in type crimping machine. Can be manufactured.

The obtained polyester staple fiber may be 100% of the conjugate fiber, or may be mixed with other fibers in a proportion of 50% each. However, under a condition including 20% by weight or more, a typical example is a ring spinning method. A spun yarn having a twist coefficient of 3.5 and a cotton count of # 40 can be used.

[0025]

EXAMPLES Examples will be described below, but the present invention is not limited to these examples.

The method adopted in the embodiment is as follows.

A. Specific resistance: Raw cotton 1 of the present invention
After being used as a spun yarn with a twist factor of 3.5 and a cotton count of 40 by using ring spinning, the yarn was spun into a weak alkaline aqueous solution of 0.2% anionic surfactant using an electric washing machine.
After washing for an hour, wash with water and dry. Next, the spun yarn was drawn to a length (L) of 5 cm, and the spun yarn of the present invention was drawn to 8 yarns.
After the temperature and humidity have been adjusted at 20 ° C. and 40% RH for 2 days, the resistance of the sample is measured at an applied voltage of 500 V by a vibration capacitance type micro-potential measuring device, and calculated by the following equation. The unit (in parentheses) of the specific resistance in Table 1 is × 10 ⁸ Ω · cm
It is.

Ρ = R × D / 9 × 10 ⁵ × L × d ρ: Volume resistivity (Ω · cm) R: Resistance (Ω) d: Sample density (g / cm ³ ) D: Fineness (denier) L : Sample length (cm) Antistatic agent amount: The sample is refluxed and boiled with ethanolamine and ethylene glycol to hydrolyze. Further, the mixture is boiled with acetic anhydride, adjusted for pH, and determined by caribol titration.

C. Knitted fabric whiteness: A tubular knitted fabric was produced using the electrostatic spun yarn of the present invention in which the cotton count was 40th on a 24 gauge tubular knitting machine. After scouring the tubular knitted fabric, using SM-3-SCH (integrating sphere method) manufactured by Suga Test Machine Co., Ltd.,
The whiteness was measured using a φ30 mm reflection test stand.

D. Black color development (L value): A tubular knitted fabric was produced using the electrostatic spun yarn of the present invention, which had a cotton count of 40, using a 24-gauge sheet knitting machine. Subsequently, after a dry heat treatment at 180 ° C., a 25% weight loss process was performed with a 3% aqueous solution of NaOH.
Then, the dye Dianix Black BG-FS2
007% o. w. f.

At this time, Sun Salt 1200 is used as an auxiliary agent.
Was used at 0.05 g / liter. Dyeing is performed at a dyeing temperature of 130 ° C. for 60 minutes at a bath ratio of 1: 100. Furthermore, hydrosulfite 2g / l, sanded 0.5g
/ Liter, NaOH 0.5 g / liter at 80 ° C, 2
Reduction washing was performed for 0 minutes.

After the obtained dyed tube was dried, the black color developing property (L value) was measured using a color computer SM-3 manufactured by Suga Test Instruments Co., Ltd. Example 1 A core / sheath composite polyester fiber having a core / sheath weight ratio of 20/80 was used. The core component was 3.5% by weight of block polyetheramide and sodium alkylsulfonate 0.1% by weight based on the total core component. 040% by weight, antioxidant 0.
96.464% by weight of polyethylene terephthalate containing 035% by weight and 2.5% by weight of titanium dioxide were blended.

On the other hand, the sheath component was polyethylene terephthalate containing 0.4% by weight of titanium dioxide. An undrawn yarn was obtained by drawing from a composite die that substantially became a concentric core-sheath composite fiber to 2 denier after drawing. Next, after performing liquid bath stretching, a constant-length heat treatment at 80 ° C. was performed for 5 seconds.

After the buckling crimp was applied, it was cut into 38 mm to obtain antistatic raw cotton. A spun yarn having a twist number of 3.5 and a cotton count of 40 was formed from 100% of the antistatic raw cotton.

The spun yarn was used as warp and weft to obtain a woven fabric having a warp density of 130 and a weft of 85 yarns / 25 mm. The antistatic property, color tone, and L value of black dyeing are as shown in Table 1, and showed good antistatic performance, good color tone, and black coloring property. Examples 2 to 4 An experiment was performed in the same manner as in Example 1 except that the blending amounts of the block polyetheramide and sodium alkyl sulfonate were changed as shown in Table 1. The results are as shown in Table 1, and good results were obtained. Examples 5 to 10 The same procedure as in Example 1 was carried out except that the amount of titanium dioxide as the core component and the blending ratio of antistatic cotton were changed. The results of the antistatic performance, the color tone, and the black color development were as shown in Table 1. Each level was a level satisfying the object of the present invention. Comparative example 1 It carried out like Example 1 except not mix | blending the amount of antistatic agents of a core component as shown in Table 1. The antistatic performance was remarkably reduced, and a level of antistatic performance satisfying the object of the present invention could not be obtained. Comparative Examples 2 and 3 Comparative Example 2 was performed in the same manner as in Example 1 except that the amount of the antistatic agent was significantly reduced. As a result, the antistatic performance was low, and the object could not be achieved. In Comparative Example 3, as a result of reducing the blending ratio of the antistatic raw cotton to 10%, the antistatic performance was low, and the object could not be achieved.

[0036]

[Table 1]

[0037]

The spun polyester yarn of the present invention is capable of imparting a very high level of durability and antistatic properties, and this spun yarn can provide a semi-permanent and highly antistatic woven or knitted fabric.

[0038]

Continued on the front page F term (reference) 4L036 MA05 MA15 MA25 PA01 PA03 PA17 PA31 UA16 4L041 AA07 AA25 BA02 BA05 BA21 BA49 BA59 BC07 BC08 BC20 BD20 CA06 CB14 CB28 DD01 DD18 DD24

Claims (6)

[Claims] 1. A spun yarn consisting essentially of polyester fiber and having a specific resistance of 5 × 10 ¹⁰ Ω · cm or less, wherein at least 20% by weight or more of the spun yarn comprises an antistatic agent as a core component. An antistatic polyester spun yarn comprising a core-sheath composite polyester fiber. 2. The polyester spun yarn according to claim 1, wherein the amount of the antistatic agent of the core component of the core-sheath conjugate fiber is 0.2 to 3% by weight based on the whole core-sheath conjugate fiber. 3. The blending ratio of the matting agent in the core component of the composite fiber is as follows:
The polyester spun yarn according to claim 2, wherein the amount is 0.6 to 10% by weight. 4. The spun antistatic polyester yarn according to claim 1, wherein the antistatic agent contained in the conjugate fiber contains a block polyetheramide. 5. The antistatic agent comprising the composite fibers, antistatic polyester according to claim 4, characterized in that it contains 1 to 10 wt% of R-SO ₃ M with respect to the block polyetheramide Spun yarn. 6. The antistatic polyester spun yarn according to claim 5, wherein the weight ratio of the matting agent to the antistatic agent of the core component of the conjugate fiber is from 0.3 to 2.0.