KR0138739B1 - An amorphous polyester drawn yarn and the manufacturing method - Google Patents

Abstract

The present invention relates to an amorphous polyester stretched yarn that exhibits a weight loss processing effect without weight loss processing and a method of manufacturing the same.

Conventional polyester fiber was able to softly improve the hash and hard hand unique to the polyester fiber only after the alkali reduction process in the post-processing.

The present invention is directed to spun amorphous copolyester containing polyethylene terephthalate with an intrinsic viscosity of at least 0.5 and at least 85 mol% at 1000 to 3000 mpm, but the equilibrium stress difference and primary stress in the orientation crystallization critical stress and the elongation curve of the unstretched yarn. It is characterized by producing an undrawn yarn by appropriately controlling the increase and then drawing it.

The amorphous polyester stretched yarn of the present invention has an initial modulus of 50 g / d or less, a crystallinity of 20% or less and a strength of 4.5 g / d or more.

The present invention is utilized as a yarn for clothing.

Description

Amorphous Polyester Drawn Yarn and Manufacturing Method Thereof

Figure 1 Strength-Elongation Curves of Unstretched Ordinary Polyester Fibers

Figure 2 Strength-Elongation Curve of Unstretched Copolyester Fiber

The present invention relates to an amorphous polyester stretched yarn having a soft and flexible characteristic even without alkali reduction and a method for producing the same.

Conventional polyethylene terephthalate fiber has a hard component in its molecular chain and has a crystal structure, resulting in a hard and hard feeling on the fabric, resulting in no suitable touch for clothing.

Therefore, the conventional polyethylene terephthalate fiber emulsifies the physical properties by post-weaving post-processing process, that is, the alkali reduction process during refinement reduction-preset-alkali loss-dyeing-final set process to obtain a soft and flexible fabric suitable for clothing. In addition, the alkali reduction process took about 20 to 25% of the total post-processing cost due to the process addition and the equipment cost required for the alkali reduction, and at the same time, it reduced the environmental pollution by the waste solution of sodium hydroxide used in the alkali reduction process. There was a problem that caused it.

In addition, mixed products of polyethylene terephthalate fibers and other fibers (hair, etc.) have been limited in their application as a mixed product because the wool is embrittled by the loss of alkali.

When these problems are mainly due to the structure of polyethylene terephthalate itself, there are problems of controlling the hard components of the molecular chain itself and controlling the crystal region, the mosaic of the amorphous region, and the degree of crystallinity. Manufacturing process conditions are required.

Among the methods for solving these problems, Japanese Patent Application Laid-Open No. 53-147814 is related to the production of polyesters containing 15% or less of a copolymer component in order to improve dyeing and leveling properties. Spinning conditions were controlled to be 40%, birefringence 0.1 or less.

In the case of Japanese Patent Application Laid-Open No. 58-54020, it is characterized by adjusting the radiation conditions for managing the birefringence and the crystal size of the yarn in order to improve the homogeneity and mechanical properties in the ultrafast spinning.

As can be seen from the above prior art, there are many literatures and inventions related to copolyester manufacturing technology related to dyeability, adhesiveness, and ultra-fast spinning, but there are not many inventions related to post-processing process, especially alkali weight loss process, and also omitted alkali loss. There has been no further research to produce an alkali reduction effect.

In addition, no studies have been made on the relationship between the orientation crystallization, the critical stress, the strength-elongation curve of the undrawn yarn, and the drawability during drawing in the polyester fiber manufacturing process.

The present invention relates to an amorphous polyester stretched yarn and a method of manufacturing the same, which exhibit an alkali reduction effect even without alkali reduction by correlating the critical stress of the orientation crystallization, the strength-elongation curve of the non-drawn yarn, and the sacrificial property at the time of stretching. The purpose of providing the bar, which will be described in detail below.

In the present invention, uncoated yarn is produced by spinning co-polyester containing 85 mol% polyethylene terephthalate and having an intrinsic viscosity of 0.5 or more at a spinning speed of 1000 to 3000 mpm to satisfy the following conditions (1) (2) (3). It is then prepared by stretching the amorphous polyester stretched yarn of less than 5%.

next

0.1 ≦ σ _ie (g / d) ≦ 0.4. . . (One)

0 ≦ Δσ _yp (g / d) ≦ 0.2. . . (2)

0 ≤ Δσ _sh (g / d) ≤ 0.2. . . (3)

From the stomach

σ _ie : critical stress of orientation crystallization as stress applied to yarn at the point where solidification occurs during spinning (3 mm under the spinneret).

Σσ _yp : The difference between the stress at the yield point and the equilibrium stress in the strength-elongation curve of undrawn yarn (anti-stress-balanced stress)

_Σσ : First stress increase in strength-elongation curve of undrawn yarn

In addition, the amorphous polyester drawn yarn produced by the present invention is characterized in that the initial elastic modulus is 50 g / d or less, the crystallinity is 20% or less and the strength is 4.5 g / d or more.

In the present invention, the copolyester is composed of polyethylene terephthalate as a main component and isophthalic acid type, adipic acid type, naphthalenedicarboxylic acid type bifunctional acid type, 1,4-cyclohexanedicarboxylic acid, 1,4-cyclo The third component such as hexane dimethanol and isobutyl alcohol is copolymerized singly or in combination.

In the present invention, when the non-oriented yarn has an orientation crystallization critical stress of less than 0.1 g / d, the elongation of the undrawn yarn increases rapidly because the crystallinity of the undrawn yarn increases and the orientation decreases.

In addition, when Δσ _yp and Δσ _sh of the non-drawn yarn exceed 0.2 g / d, the initial cutting rate increases rapidly during drawing, so that the drawing workability is poor and the strength of the drawn yarn is too low.

In addition, when the orientation crystallization critical stress exceeds 0.4 g / d, the crystallization progresses slowly and has a structure of yarn with only increased orientation, resulting in lowered stretchability.

As shown in FIG. 2, the strength-elongation curve of the non-twisted yarn of the copolyester or the polyester containing the additive shows a tendency different from that of the conventional general polyester (see FIG. 1).

Most notable among the other trends is Δσ _yp and Δσ _sh , and Δσ _yp and Δσ _sh tend to increase in proportion to the copolymer content and the additive content, and at the same time the structure of the undrawn yarn It shows a close relationship.

In particular, it is closely related to the orientation crystallization and the critical stress, which are stresses on the yarns in the spinline during spinning.

And because of these matters, the stretchability of the copolyester is quite poor, and at the same time, these matters are regarded as one of the causes of many problems during the post-processing process.

Therefore, the problem of reducing the change of Δσ _yp and Δσ _sh is closely related to the sacrificial improvement of the copolyester.

Therefore, in the present invention, amorphous tertiary polyester containing 85 mol% or more of polyethylene terephthalate and 15 mol% or less of copolymer and having no crystallization temperature or melting temperature was spun at a spinning speed of 1000 to 3000 mpm.

In this case, σ _ie is a factor that depends on the radial velocity and the distance under the spinneret. When the flux is less than 1000 mpm, σ _ie is less than 0.1 (g / d), and 0.4 (g / d0) when the flux exceeds 3000 mpm. Will be exceeded.

Therefore, by adjusting the σ _ie appropriately to prepare an unstretched yarn having σ _yp and σ _sh of 0.2 or less, respectively, the stretching temperature is 100 to 150 ° C., the stretching speed is 600 m / min, and the stretching ratio is 2.5 to 3.5 times. And an amorphous polyester stretched yarn having an elongation of 30 to 40% and a strength of 4.5 (g / d) or more.

In general, the copolyester tends to decrease the drawability due to the initial cutting and the lap occurrence when the drawing speed is 600 m / min, and the drawing speed is 600 when the σ _yp and σ _sh are each 0.2 (g / d) or less. Sacrificiality within 5% at m / min.

If the stretching condition is out of the above range, it is a cause of poor debris.

Example 1

Polyethylene terephthalate as a main component, 12 mol% of 1,4-cyclohexanedimethanol was added as a third component to prepare an amorphous copolyester, and then spun at a spinning temperature of 280 ° C. and a spinning speed of 1350 mpm. After the preparation, the drawing was carried out at a drawing temperature of 140 ° C., a drawing speed of 600 m / min, and a draw ratio of 3.092 times to prepare a stretched yarn of 75 denier and 36 filaments.

Example 2

The unstretched yarn of Example 1 was stretched 3.312 times, and the other stretching conditions were stretched in the same manner as in Example 1.

Example 3

Polyethylene terephthalate as a main component, 5 mol% of adipic acid and 5 mol% of 2,2-dimethyl-1,3 propanediol were added as a third component to prepare an amorphous copolyester, and then a spinning temperature of 280 ° C. After spinning at a spinning speed of 1350 mpm to prepare a non-drawn yarn, a stretched yarn of 75 denier and 36 filaments was prepared by stretching at a draw temperature of 140 ° C., a stretching speed of 600 m / min, and a draw ratio of 3.092 times.

Example 4

The unstretched yarn of Example 3 was stretched 3.312 times, and the other stretching conditions were stretched in the same manner as in Example 3.

Comparative Example 1

Polyethylene terephthalate as a main component, 12 mol% of 1,4-cyclohexanedimethanol was added as a third component to prepare an amorphous polyester, and then spun at a spinning temperature of 280 ° C. and a spinning speed of 500 mpm to produce undrawn yarn. After the preparation, the film was drawn at a draw temperature of 140 ° C., a drawing speed of 600 m / min, and a draw ratio of 3.092 times to prepare a stretched yarn of 75 denier and 36 filaments.

Comparative Example 2

The unstretched yarn of Comparative Example 1 was stretched 3.312 times, and the other stretching conditions were stretched in the same manner as in Comparative Example 1.

Comparative Example 3

Polyethylene terephthalate as a main component, 12 mol% of 1,4-cyclohexanedimethanol was added as a third component to prepare an amorphous polyester, and then spun at a spinning temperature of 280 ° C. and a spinning speed of 3500 mpm to produce undrawn yarn. After the preparation, the film was drawn at a draw temperature of 140 ° C., a drawing speed of 600 m / min, and a draw ratio of 3.092 times to prepare a stretched yarn of 75 denier and 36 filaments.

Comparative Example 4

The unstretched yarn of Comparative Example 3 was stretched 3.312 times, and the other stretching conditions were stretched in the same manner as in Comparative Example 3.

Comparative Example 5

Polyethylene terephthalate as a main component, 5 mol% of adipic acid and 5 mol% of 2,2-dimethyl-1,3 propanediol were added as a third component to prepare an amorphous copolyester, and then a spinning temperature of 280 ° C. After spinning at a spinning speed of 500 mpm to prepare an undrawn yarn, the drawn temperature was 140 deg. C, a drawing speed of 600 m / min, and a draw ratio of 3.092 times. Thus, 75 denier and 36 filament drawn yarns were prepared.

Comparative Example 6

The unstretched yarn of Comparative Example 5 was stretched 3.312 times, and the other stretching conditions were stretched in the same manner as in Comparative Example 5.

Comparative Example 7

Polyethylene terephthalate as a main component, 5 mol% of adipic acid and 5 mol% of 2,2-dimethyl-1,3 propanediol were added as a third component to prepare an amorphous copolyester, and then a spinning temperature of 280 ° C. After spinning at a spinning speed of 3500 mpm to prepare an undrawn yarn, a drawn temperature of 140 DEG C, a stretch rate of 600 m / min, and a draw ratio of 3.092 times were drawn to prepare a stretched yarn of 75 denier and 36 filaments.

Comparative Example 8

The unstretched yarn of Comparative Example 7 was stretched 3.312 times, and the other stretching conditions were stretched in the same manner as in Comparative Example 7.

Comparative Example 9

Polyethylene terephthalate as a main component, 10 mol% of polyethylene glycol is added as a third component to prepare an amorphous copolyester, and then spun at a spinning temperature of 280 ° C. and a spinning speed of 500 mpm to prepare an unstretched yarn. The stretched yarn of 75 denier and 36 filaments was produced by extending | stretching at the temperature of 140 degreeC, extending | stretching speed 600m / min, and draw ratio 3.092 times.

Comparative Example 10

The unstretched yarn of Comparative Example 9 was stretched to 3.312 times, and the other conditions were stretched in the same manner as in Comparative Example 9.

Comparative Example 11

Polyethylene terephthalate as a main component, 10 mol% of polyethylene glycol is added as a third component to prepare an amorphous copolyester, and then spun at a spinning temperature of 280 ° C. and a spinning speed of 1350 mpm to prepare an unstretched yarn. The stretched yarn of 75 denier and 36 filaments was produced by extending | stretching at the temperature of 140 degreeC, extending | stretching speed 600m / min, and draw ratio 3.092 times.

Comparative Example 12

The unstretched yarn of the comparative example 11 was extended | stretched 3.312 times, and other extending | stretching conditions were extended similarly to the comparative example 11.

Comparative Example 13

Polyethylene terephthalate as a main component, 10 mol% of polyethylene glycol is added as a third component to prepare an amorphous copolyester, and then spun at a spinning temperature of 280 ° C. and a spinning speed of 3500 mpm to prepare an unstretched yarn. The stretched yarn of 75 denier and 36 filaments was produced by extending | stretching at the temperature of 140 degreeC, extending | stretching speed 600m / min, and draw ratio 3.092 times.

Comparative Example 14

The unstretched yarn of Comparative Example 13 was stretched to 3.312 times, and the other stretching conditions were stretched in the same manner as in Comparative Example 12.

Comparative Example 15

Polyethylene terephthalate having an intrinsic viscosity of 0.64 was spun at a spinning temperature of 280 ° C. and a spinning speed of 1350 mpm to prepare an unstretched yarn, followed by drawing at a draw temperature of 140 ° C., a stretching speed of 600 m / min, and a draw ratio of 3.092 times, to 75 deniers. A stretched yarn of 36 filaments was prepared.

Comparative Example 16

The unstretched yarn of the comparative example 15 was extended | stretched 3.312 times, and other extending | stretching conditions were extended similarly to the comparative example 15.

Table 1 shows the manufacturing conditions, the manufacturability and the physical properties of the manufacturing examples of Examples 1 to 4 and Comparative Examples 1 to 16.

Where 1. Glass transition temperature, crystallization temperature, and melting temperature are obtained by differential scanning thermal analyzer.

2. Elastic modulus and elongation are measured using Instron equipment.

3. Sacrificiality

Claims (4)

A non-drawn yarn was prepared by spinning an amorphous copolyester containing more than 85 mol% of polyethylene terephthalate and having an intrinsic viscosity of 0.5 or more at a spinning speed of 1000 to 3000 mpm, satisfying the following conditions (1), (2) and (3): And then a method for producing amorphous polyester stretched yarn, characterized by drawing. next 0.1 ≦ σ _ie (g / d) ≦ 0.4. . . (One) 0 ≦ Δσ _yp (g / d) ≦ 0.2. . . (2) 0 ≤ Δσ _sh (g / d) ≤ 0.2. . . (3) From the stomach σ _ie : critical stress of orientation crystallization as stress applied to yarn at the point where solidification occurs during spinning (3 mm under the spinneret). Σσ _yp : The difference between the stress at the yield point and the equilibrium stress in the strength-elongation curve of undrawn yarn (anti-stress-balanced stress) _Σσ : First stress increase in strength-elongation curve of undrawn yarn The method of claim 1, wherein the copolyester is a polyethylene terephthalate isophthalic acid, sebacic acid, adipic acid, naphthalenedicarboxylic acid difunctional acid, 1,4-cyclohexanedicarboxylic acid, 1,4 -A method for producing amorphous polyester stretched yarn, characterized in that a third component selected from cyclohexanedimethanol and isobutyl alcohol is copolymerized singly or in combination. An amorphous polyester drawn yarn comprising at least 85 mol% of polyethylene terephthalate as a copolyester-drawn yarn. next Initial modulus: 50 g / d or less Crystallinity: 20 5 or less Strength: 4.5 g / d or less The copolymer polyester according to claim 3, wherein the copolyester is a polyethylene terephthalate isophthalic acid, sebacic acid, adipic acid, naphthalenedicarboxylic acid, difunctional acid, 1,4-cyclohexanedicarboxylic acid, 1,4 An amorphous polyester stretched yarn characterized by copolymerizing a third component selected from cyclohexanedimethanol and isobutyl alcohol alone or in combination.