JPH1181043A - Polyester thick and thin yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyester thick and thin yarn comprising polytrimethylene terephthalate, having a specific U%-value, specific strength, specific elongation and specific modulus of elasticity, and thereby excellent in fastness, capable of exhibiting a soft, characteristic solid-color tone touch or a kasuri-weave (a splashed pattern) tone touch and useful for a woven or knit fabric or the like. SOLUTION: This polyester thick and thin yarn substantially comprises polytrimethylene terephthalate obtained by the polycondensation of terephthalic acid and 1,3-propanediol, and having, for example, an intrinsic viscosity [η]ranging from 0.6 to 1.2, and has a U%-value of 1-10%, a strength of >=2.0 g/d, an elongation of 50-100% and an modulus of elasticity of 20-50 g/d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester thick and thin yarn, and more particularly, it is excellent in fastness and, when applied to a woven or knitted fabric, exhibits a soft and unique texture of solid or slick. The present invention relates to a thick polyester yarn.

[0002]

2. Description of the Related Art It has long been known that by drawing an undrawn polyester yarn at a low magnification, a fiber having a partially different yarn diameter in the yarn length direction, that is, a thick and thin yarn can be obtained (for example, And JP-B-51-7207).
In a thick and thin yarn, a portion with a large diameter is in an undrawn state and a portion with a small diameter is in an extended state, so that the thick portion is dyed more densely than the thin portion. for that reason,
When a thick or thin yarn is made into a woven or knitted fabric, the dyed product has a unique uneven dyeing pattern, which is widely preferred by consumers.

On the other hand, considering the feel of a woven or knitted fabric, a thick and thin yarn made of polyethylene terephthalate has a slightly firm feel due to a high elastic modulus of the fiber. If the elastic modulus of the thick and thin yarn is reduced, a soft hand can be obtained, but the robustness, and the dry cleaning fastness is reduced by a known technique. In order to achieve a soft texture, the elastic modulus is preferably set to 50 g / d or less.
For example, if an attempt is made to achieve such an elastic modulus, a large amount of comonomer must be copolymerized, resulting in a significant decrease in robustness. In addition, when a thick thread is used by using a polyester polymer other than polyethylene terephthalate such as polybutylene terephthalate, a soft hand can be achieved, but the robustness is also significantly reduced. As described above, in the known methods, there is no proposal to provide a thick and thin yarn having a soft texture and excellent fastness.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polyester thick and thin yarn which is excellent in fastness and expresses a soft and unique texture of solid color or slickness.

[0005]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that it is extremely effective to use polytrimethylene terephthalate to solve the above-mentioned problems. The inventors have found that a fiber having certain extremely limited physical properties can solve the above-mentioned problems, and as a result of further study, have reached the present invention. That is, the present invention consists essentially of polytrimethylene terephthalate, has a U% value of 1 to 10%, and has a strength of 2.0 g / g.
d or more, elongation is 50 to 100%, elastic modulus is 20 to 50 g
/ D, which is a polyester thick and thin yarn.

The thick polyester yarn of the present invention is polytrimethylene terephthalate obtained by substantially polycondensing terephthalic acid and 1,3-propanediol.
Acid components such as isophthalic acid, succinic acid, adipic acid, and 2,6-naphthalenedicarboxylic acid, and 1,4-butanediol, 1,6-hexanediol, cyclohexanedimethanol, and the like, as long as the effects of the present invention are not impaired. Less than 10 wt% of a glycol component, ε-caprolactone, 4-hydroxybenzoic acid, polyoxyethylene glycol, polytetramethylene glycol, or the like.

[0007] If necessary, various additives such as matting agents, heat stabilizers, defoaming agents, tinting agents, flame retardants, antioxidants, ultraviolet absorbers, infrared absorbers, crystal nuclei. Agents, optical brighteners and the like may be copolymerized or mixed. Especially,
When titanium oxide is used as the matting agent, its content is usually 0.01 to 3 wt%, and may be any of so-called bright, semi-dal, and full-dal. The polymer constituting the polyester thick and thin yarn of the present invention can be polymerized using a known method. For example, a transesterification reaction of terephthalic acid or a lower alcohol ester of terephthalic acid and an excess of 1,3-propanediol in the presence of a catalyst such as tetrabutyl titanate is performed, and then a catalyst such as tetrabutyl titanate is added to the obtained reaction product. In addition, the polymer can be obtained by performing a polycondensation reaction at 240 to 280 ° C under a vacuum of 0.5 torr or less. When performing copolymerization, a comonomer can be added at any stage of the above polymerization method. In the case of copolymerizing a carboxylic acid and its derivative, it is preferable to add a comonomer at the beginning of the polymerization, and in the case of copolymerizing an alcohol, it is preferable to add it at the time when the transesterification reaction is completed.

[0008] The molecular weight of the polymer constituting the polyester thick yarn of the present invention can be defined by the intrinsic viscosity measured by the method described in the Examples. The intrinsic viscosity [η] is generally in the range of 0.4 to 2.0, preferably 0.5 to 1.5, and more preferably 0.6 to 1.2. The intrinsic viscosity is 0.
If it is less than 4, the melt viscosity of the polymer is too low, so that the spinnability becomes unstable, and the strength of the obtained fiber is also low, which is not satisfactory. Conversely, the intrinsic viscosity is 2.0
If the viscosity exceeds, the melt viscosity is too high, so that the metering by the gear pump is not performed smoothly, and the spinnability deteriorates due to poor discharge or the like.

The polyester thick and thin yarn of the present invention has a thickness in the yarn length direction, and the degree of unevenness is represented by U%.
It must be in the range of 0%. When the content is in the range of 1 to 2.5%, a plain woven or knitted fabric can be obtained, and when the content is in the range of 3 to 10%, a woven or knitted fabric having a fuzzy tone can be obtained. If U% is less than 1%, solid color tone cannot be obtained, and if it is more than 10%, the thick part of the yarn diameter is too conspicuous and does not become a pattern preferred by consumers, giving a cheap feeling. I can only do it. In the case of the solid color tone, it is preferably 1 to 2% from the viewpoint of good texture, and in the case of the fine tone, it is preferably 2.5 to 5% from the viewpoint of the post-process passability.

[0010] Further, since thick and thin yarns are usually subjected to false twisting, in order to achieve process stability, a strength of 2.0 g / g is required.
d or more, the elongation must be 50 to 100%. When the strength is lower than 2.0%, there is a disadvantage that fluff is easily generated. If the elongation is less than 50%, a thick and thin thread cannot be produced, and if the elongation is 100% or more, the shrinkage during scouring or dyeing becomes too large, and the texture becomes hard. Preferably, it is 50 to 70% from the viewpoint of process passability. Further, it is necessary that the elastic modulus is 20 to 50 g / d in order to obtain a woven or knitted fabric having a soft texture. Elastic modulus 2
If it is less than 0 g / d, the orientation of the fibers is insufficient and the fastness deteriorates. On the other hand, if it exceeds 50 g / d, a soft texture is not exhibited. Preferably, from the viewpoint of softness,
40 g / d.

[0011] The cross section of a single yarn of the polyester thick and thin yarn of the present invention is not particularly limited, and may be a round, triangular, square, pentagonal or flat yarn. Further, it may be a solid fiber, a hollow fiber, or a sheath core yarn. In the case of a hollow fiber, the shape of the hollow portion is not particularly limited, and a plurality of hollow portions may be formed. The method for producing the polyester thick and thin yarn of the present invention is described below, but is not particularly limited thereto.

In general, this is achieved by stretching an undrawn yarn that has been melt-spun and wound once, or an undrawn yarn that is formed on a spinning line without winding, at a draw ratio equal to or less than the natural draw ratio. it can. Spinning temperature is 240-320
° C, preferably 245-300 ° C, more preferably 25 ° C.
A range from 0 ° C to 280 ° C is appropriate. Spinning temperature is 240
When the temperature is lower than 0 ° C, the temperature is too low to be in a stable molten state, the resulting fibers have large irregularities, and no satisfactory strength is exhibited. If the spinning temperature exceeds 320 ° C., thermal decomposition becomes severe, and the obtained yarn is colored and does not show satisfactory strength. The spinning speed of the yarn is not particularly limited, but is usually 6000 m / min or less, preferably 3000 m / min or less, and more preferably 2000 m / min.
min or less.

Hereinafter, the method for producing the polyester thick and thin yarn of the present invention will be specifically described. At the very beginning of the elongation of the undrawn yarn, the elasticity is large, so the tension increases and almost no elongation occurs. When the tension reaches a certain maximum value (yield stress)
A neck called a neck occurs in a weak portion of the yarn. Along with this, the flowing portion generates heat locally, causing a decrease in tension. Thereafter, the stretched portion grows from the unstretched portion with a constant tension. This state continues until there is no unstretched part,
The stretch ratio at which the unstretched portion disappears is referred to as a natural stretch ratio. When the undrawn yarn disappears, the tension increases again, and the sample breaks at the maximum draw ratio. When the fiber is drawn at a draw ratio equal to or lower than the natural draw ratio, an undrawn portion having a large yarn diameter and a drawn portion having a small yarn diameter are mixed in the fiber, and a thick fine yarn is formed.
This condition gives good unevenness after dyeing. In the case of producing the thick and thin yarn of the present invention, it is only necessary to draw at a draw ratio of not more than the natural draw ratio, but it is preferable to draw while heating with a draw roll or a hot plate.

This is because if the stretching temperature is low, the strength and elongation are reduced. U% 1-2%
In order to make the temperature of the drawing roll equal to or higher than (glass transition temperature of undrawn yarn + 30) ° C. and not higher than (glass transition temperature of undrawn yarn + 60) ° C., 70% of the natural drawing ratio to less than the natural drawing ratio. It is preferable that the stretching is carried out while applying a tension at a temperature not lower than the glass transition temperature of the undrawn yarn and not higher than the crystallization temperature. Temperature of (glass transition temperature of undrawn yarn -20) ° C or more, (glass transition temperature of undrawn yarn + 30)
After stretching at a temperature not higher than the natural stretching ratio at 11 ° C. or less, 11
It is preferable to heat set at 0 to 150 ° C. Although the glass transition temperature of the undrawn yarn depends on the spinning conditions, it is usually 20.
７０70 ° C. This heat setting temperature is greatly related to the physical properties of the thick and thin yarn. By setting the heat setting temperature to 110 to 150 ° C, good dry cleaning fastness,
Excellent elongation is achieved and a thick polyester yarn having a soft texture is obtained. If the heat setting temperature is too low, the fastness to dry cleaning deteriorates. Conversely, if the heat setting temperature is too high, the yarn shrinks and becomes hard, and a soft texture is not achieved.

[0015]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples and the like, but needless to say, the present invention is not limited to the examples and the like. The main measured values in the examples were measured by the following methods. (1) Reduced viscosity of polymer (ηcp / C) Using o-chlorophenol as a solvent, a polymer concentration of 1.
It was measured at 0% and 35 ° C.

(2) Strength and elongation Tensilon manufactured by Orientec Co., Ltd., yarn length 20 cm,
The measurement was performed under the conditions of a pulling speed of 20 cm / min. (3) U% It was measured using UT-3 manufactured by Zellbeger Worcester.
The measured value was taken from three pans, and the arithmetic mean thereof was defined as U%. (4) Measurement of glass transition point Using a DSC manufactured by Seiko Denshi, in a nitrogen stream, heating rate 2
It was measured at 0 ° C./min.

(5) Color fastness Using a single-knit knitted fabric of the obtained thick and thin yarn, score roll 400 was used.
Using warm water containing (trade name) at 2 g / liter, 70
After scouring at 20 ° C. for 20 minutes and drying with a tumbler dryer, a heat set at 180 ° C. for 30 seconds using a pin tenter was used. The dye is Kayaron Polyester Blue 3RSF (Nippon Kayaku Co., Ltd .; trade name)
And dyed at 6% owf, bath ratio 1:50. As a dispersant, Nikka Sun Salt 7000 (manufactured by Nikka Chemical Co., Ltd .; trade name) is used in an amount of 0.5 g / liter and acetic acid 0.25 ml /
Liter and 1 g / liter of sodium acetate, add pH
Was adjusted to 5. Using the dyeings thus obtained, the fastness was evaluated. Various color fastnesses were evaluated according to the JIS method. For example, dry cleaning fastness is JI
The lightfastness of JIS-L-084 is as specified in SL-0860.
2 was followed. Here, the dry cleaning fastness means liquid contamination.

Example 1 A polytrimethylene terephthalate polymer chip having an intrinsic viscosity of 0.8 was treated at 130 ° C. with 1
After drying under a nitrogen stream of 00 l / min for 20 hours,
Using a spinning hole having 36 round holes, the spinning temperature was 275.
An undrawn yarn was prepared at a spinning speed of 1200 m / min. The natural stretching ratio was 1.8 times. The glass transition point of the undrawn yarn was 50 ° C. Subsequently, the obtained undrawn yarn was drawn at a hot roll of 55 ° C., a hot plate of 130 ° C., a draw ratio of 1.45 times, and a drawing speed of 800 m / min to obtain a drawn yarn of 100d / 36f. U% is 4.
7, strength 2.9 g / d, elongation 76%, elastic modulus 25 g / d
Met. The light fastness of the dyed product was grade 4, and the dry cleaning fastness was grade 3 to 4.

The obtained thick and thin yarn was subjected to a false twist temperature of 170 ° C., a false twist speed of 400 m / min, and a false twist number of 1800 T / m. The processability was very good, and no fuzz was generated. A wool was twisted with the processed yarn to prepare a twisted yarn of 350 denier. Using this yarn as a warp and a weft, a plain fabric was prepared. Disperse dye (Resolin Blue FBL, manufactured by Bayer AG; trade name) and acid dye (Narosan Blue N-
GFL Sandoz (trade name), 1.0% owf, and staining at 105 ° C. for 60 minutes. After soaping by a conventional method, the obtained dyed product was a soft fabric and a swollen feeling, and was a faint woven fabric dyed in dark color. Light fastness is 5
Grade and dry cleaning fastness were grade 4.

Example 2 A polytrimethylene terephthalate polymer chip having an intrinsic viscosity of 1.0 was treated at 130 ° C. with 1
After drying under a nitrogen stream of 00 l / min for 20 hours,
Using a spinning hole having 36 round holes, the spinning temperature was 275.
An undrawn yarn was prepared at a spinning speed of 1500 m / min. The natural stretching ratio was 1.8 times. The glass transition point of the undrawn yarn was 50 ° C. Next, the obtained undrawn yarn is drawn at a draw ratio of 1.46 times with a hot roll at 90 ° C., and further drawn at a draw ratio of 1.02 times with a hot plate at 110 ° C., while being drawn at a drawing speed of 800 m / min. And a 100d / 36f drawn yarn was obtained. U% is 1.
4, strength 3.3 g / d, elongation 76%, elastic modulus 28 g / d
Met. The light fastness of the dyed product was grade 4, and the dry cleaning fastness was grade 3 to 4.

The obtained thick and thin yarn was subjected to a false twist temperature of 170 ° C., a false twist speed of 400 m / min, and a false twist number of 1800 T / m. The processability was very good, and no fuzz was generated. A wool was twisted with the processed yarn to prepare a twisted yarn of 350 denier. Using this yarn as a warp and a weft, a plain fabric was prepared. Disperse dye (Resolin Blue FBL, Bayer) and acid dye (Narosan Blue N-GFL)
(Made by Sando Co., Ltd.) at 1.0 ° C., 6%
Stained for 0 minutes. After soaping by a conventional method, the obtained dyed product was a plain-colored woven fabric full of softness and swelling and dyed dark. The light fastness was grade 5 and the dry cleaning fastness was grade 4.

(Comparative Example 1) For comparison, a thick thin fiber of polybutylene terephthalate was prepared in the same manner as in the method described in Example 1, but the dye was dissolved when immersed in a dry cleaning solution. The dry cleaning fastness was grade 2. (Comparative Example 2) For comparison, in the same manner as described in Example 1, thick polyethylene terephthalate thin yarn was prepared to prepare a plain woven fabric. The fastness was good, but the texture was firmer than the fabric of Example 1. This is because the elastic modulus of the thick and thin yarn was 100 g / d.

[0023]

Industrial Applicability The polyester thick yarn of the present invention is a polyester thick yarn exhibiting a novel appearance and texture which is excellent in fastness, expresses a soft and unique solid tone or a lustrous texture. Single use or natural fiber,
When mixed with other synthetic fibers and synthetic fibers, a unique solid tone or
It is possible to provide a woven or knitted fabric having a fine texture.

Claims (1)

[Claims] 1. It is composed essentially of polytrimethylene terephthalate, has a U% value of 1 to 10%, and has a strength of 2.0 g / d.
As described above, the elongation is 50 to 100% and the elastic modulus is 20 to 50 g /
d thick polyester thin yarn.