KR20030021834A - Method for manufacturing metachromatic polyester conjugated yarn having improved size stability - Google Patents

Abstract

PURPOSE: A process of the titled polyester conjugate fiber by spinning two components of a dyed polyester and undyed polyester with a basic dye through a spinning nozzle and then subjecting to a subsequent process such as solidifying, drawing, heat treating, air interlacing and winding is provided, thereby to produce the conjugate fiber having excellent drawability, dyeability and dimensional stability after processing. CONSTITUTION: Two components of a dyed polyester and undyed polyester with a basic dye are spun through a spinning nozzle(1), the spun polyesters are cold drawn between a first godet roller(4) with a speed of 1,000 to 4,000m/min and second godet roller(5) at 100 to 150deg.C and then heat treated between the second godet roller and a third godet roller(6) at 160 to 220deg.C. The dyed polyester with a basic dye is a copolymerized polyester containing 0.5 to 1.5% by mole of metal sulfonate based on terephthalic acid and having an intrinsic viscosity of 0.5 to 0.7 and the undyed polyester with a basic dye is a linear polyethylene terephthalate having an intrinsic viscosity of 0.6 to 0.8.

Description

Method for manufacturing metachromatic polyester conjugated yarn having improved size stability}

The present invention relates to a method for producing a dibasic polyester composite yarn, and more particularly, in the preparation of a dibasic polyester composite yarn, the two components of a basic dye salted polyester and a basic dye fluorinated polyester are side-by-side. Simultaneously discharging through spinnerets arranged in a side-by-side manner, solidifying yarns, stretching and heat treatment, and winding by imparting air entanglement in an interlacer. It relates to a manufacturing method.

In general, dibasic polyester composite yarns are prepared by a combination of two kinds of polymers or filaments (usually basic dye chlorinated polyesters and basic dye fluorinated polyesters) by methods such as composite spinning, tetrahedral yarn, and polymer blending.

Among the above methods, the dibasic polyester by complex spinning has a filament blending method as disclosed in Japanese Patent Laid-Open Nos. 58-43485, 57-8885 and 52-74053, and Japanese Patent Laid-Open No. 58-38524. And filament intermixing methods as disclosed in US Pat. Nos. 61-296121, 61-89326 and 62-184185. In the filament blending method, basic dye fluorinated polyester is expressed as a loop due to the difference in elastic recovery rate between the two components during drawing after drawing at low spinning speed. It is solved but has a disadvantage in that the dichroic effect is inferior.

In addition, the preparation of the dichroic polyester composite yarn by the yarn processing yarn method introduced in Japanese Patent Application Laid-Open No. 4-185735 has a disadvantage in that a loop occurs severely like the mixed yarn by the composite spinning, and a two step process of spinning after spinning Since there is a problem such as productivity is lowered and manufacturing costs are increased.

On the other hand, in the case of preparing the dyeing polyester composite yarn by the polymer blending method introduced in Japanese Patent Laid-Open Nos. 55-158328 and 55-40810, there is an advantage of having a uniform dyeing effect by blending and no looping. However, there is a disadvantage that the dichroic expression effect due to otitis is too weak.

In order to solve the above problems, a method of manufacturing a chlorinated polyester composite yarn by interfilament filament using a spin draw method has been proposed, but this method also has a basic dye fluorinated polyester and a basic discharged from spinnerets. When the dye salted polyester is drawn between the first and second high controllers, slight looping by mechanical drawing becomes a problem.

To solve the problems of the prior art as described above of the present invention, in the production of a dye-polyester composite yarn to solve the problems such as the occurrence of loops in the filament manufacturing process and a weak dyeing effect after dyeing at the same time dimensions An object of the present invention is to provide a method for improving stability.

That is, the present invention provides a spinneret in which the two components of the basic dye chlorinated polyester and the basic dye fluorinated polyester are arranged in a side-by-side manner. Simultaneously discharging and solidifying thread yarns, stretching and heat treatment, and then providing an air entanglement in the interlacer to provide a method for producing a dibasic polyester composite yarn.

1 is a schematic diagram of a spinning apparatus used for producing a polyester composite yarn according to the present invention.

Explanation of symbols on the main parts of the drawings

1: spinneret, 2: cooling device, 3: emulsion supply device

4: the first gode controller part, 5: the second gode controller part, 6: the third gode controller part

7: interlacer, 8: winding machine

Hereinafter, the present invention will be described in more detail with reference to FIG. 1.

In the method for preparing a dye-containing polyester composite yarn according to the present invention, a basic dye fluorinated polyester and a basic dye chlorinated polyester are simultaneously discharged through a spinneret 1 arranged in a side-by-side manner. Thereafter, the polyester yarns are completely cooled by the cooling device 2 to be solidified, and then the oil is fed and concentrated in the emulsion supply device 3, and then wound around the first go-de controller unit 4 and the second go-de-roller several times. Stretched between the sections 5, heat-treated to impart dimensional stability between the second godetrol section 5 and the third godetrol section 6, then impart air entanglement in the interlacer 7 and winding Winding up in the blower (8).

Turning to the method of the present invention in more detail as follows.

In the present invention, the polyester polymer discharged from the spinneret 1 is primarily molecularly aligned in a section up to the first high controller portion 4. At this time, the speed of the first gode controller unit 4 is 1,000 m / min to 4,000 m / min, more preferably 1,500 m / min to 3,500 m / min. If the speed of the first gode controller portion 4 is less than 1,000 m / min, the molecular structure of the polymer in the filament is in the unoriented form, and then the filament due to the difference in shrinkage between the different polyester filaments in the stretching section and the heat treatment section Single trimming occurs and process workability becomes unstable. On the other hand, when the speed of the first gode controller portion 4 exceeds 4,000 m / min, the process dyeability is also unstable due to the tension unevenness between the individual filaments due to the basic dye chlorinated polyester approaching the perfect orientation state. .

The filament that has passed through the first gode controller part 4 is stretched between the first gode controller part 4 and the second gode controller part 5, but is not heat-treated in the first gode controller part 4, and the second The heat treatment is performed after the gode controller portion 5. In other words, the stretching between the first gode controller unit 4 and the second gode controller unit 5 is cold drawn, the reason for this process is that the filament drawn in the cold drawn state is higher than the heat drawn filament shrinkage rate This is because stress is generated and molecular orientation in the filament is increased. At this time, the speed of the second gode controller portion 5 is determined so that the difference in the degree of orientation and shrinkage of the basic dye fluorinated polyester and basic dye vulcanized polyester molecules satisfies the following equation:

ΔN≤20

△ S≤10

In the above formula, ΔN represents the difference in the degree of orientation of the basic dye fluorinated polyester and the basic dye chlorinated polyester filament, and ΔS represents the difference in shrinkage of the basic dye fluorinated polyester and the basic dye chlorinated polyester filament.

In order to determine the speed of the second gode controller portion 5 that satisfies these conditions, first, basic dye fluorinated polyester and basic dye chlorinated polyester are first tested and spun under various process conditions, and then the degree of orientation of the filaments obtained therefrom. By measuring the shrinkage rate, the speed of the second high controller portion 5 which simultaneously satisfies the above two equations is adopted.

The stress remaining in the filament as a result of being stretched in the first and second high-detro controller section 4 and the second go-de-roller section 5 is released by heat treatment in the second go-de-roller section 5 and the third go-de-roller section 6. Given. The reason for this process is that if the residual shrinkage stress of the cold drawn filament is not completely removed, the dimensional stability of the manufactured filament is poor.

At this time, the heat treatment temperature of the second gode controller portion 5 is preferably 100 ° C to 150 ° C. If the heat treatment temperature of the second high controller portion 5 is less than 100 ° C., the amount of heat supplied to the filament is small and the mobility of molecules in the filament is not sufficient, resulting in poor processability due to single cutting. On the other hand, if the heat treatment temperature of the second gode controller portion 5 exceeds 150 ℃ due to the increase in the filament fluidity in the second gode controller portion 5, the dyeing failure after filament production occurs.

In addition, as for the heat processing temperature of the 3rd high controller part 6, 160-220 degreeC is suitable. If the heat treatment temperature of the third high controller portion 6 is less than 160 ° C., the residual shrinkage stress of the cold stretched filament in the section between the first and second controller parts 4 and 5 may not be completely removed. The dimensional stability of the manufactured filament is poor. On the other hand, when the heat treatment temperature of the third gode controller portion 6 exceeds 220 ° C partial fusion between filaments is generated, causing poor processability.

In addition, the speed of the third gode controller portion 6 is determined by the speed of the second gode controller portion 5, and must satisfy the following equation:

0.9≤V ₃ / V ₂ ≤1.0

In the above formula, V ₂ and V ₃ represent the speeds of the second high controller section 5 and the third high controller section 6, respectively.

On the other hand, the type of basic dye fluorinated polyester and basic dye chlorinated polyester used in the present invention is not particularly limited as long as the object of the present invention is not impaired. Preferably, the basic dye fluorinated polyester has an intrinsic viscosity of 0.6 to 0.8. A linear polyethylene terephthalate is used, and a basic dye salted polyester is used a copolymer polyester having an intrinsic viscosity of 0.5 to 0.7 containing 0.5 to 1.5 mol% of a metal sulfonate relative to terephthalic acid. If the intrinsic viscosity of the basic dye fluorinated polyester is less than 0.6 and the intrinsic viscosity of the basic dye chlorinated polyester is less than 0.5, the polymerization degree of the polymer is low and filament single cutting occurs. In addition, when the intrinsic viscosity of the basic dye fluorinated polyester is more than 0.8 and the intrinsic viscosity of the basic salt salted polyester is more than 0.7, excessive tension is applied to the spinning yarn, which also causes filament single yarn breakage and the like, resulting in poor workability. .

First, the method for producing a dye-containing polyester composite yarn of the present invention can firstly prevent radiation and post-processability deterioration due to loop expression between two-component polymer filaments, which is a disadvantage of the conventional method, by heat-treating the yarn running on the radiation; Second, the side-by-side type spinning can be compensated for the weakness of the dichroic expression effect in the preparation of the dye-containing polyester composite yarn by polymer blending; Third, because it is a one-step process, productivity is dramatically increased and manufacturing costs can be significantly reduced; Finally, the dimensional stability of the filament is improved during post-processing by completely removing the residual shrinkage stress in the filament after mechanical stretching by heat treatment.

Hereinafter, the present invention will be described in more detail with reference to examples, but these examples are for illustrative purposes only and should not be construed as limiting the present invention.

Examples 1-5

Polyethylene terephthalate having an intrinsic viscosity of 0.63 measured with phenol / tetrachloroethane was used as a basic dye fluorinated polyester, and a copolymer dye having an intrinsic viscosity of 0.55 containing 0.8 mol% of metal sulfonate relative to terephthalic acid was used as a basic dye salted polyester. A circular hole spinneret of 36 holes was used to spin at a temperature of 293 ° C. in the range of 2,000 to 3,000 m / min based on the speed of the first high-detro controller 4 to obtain 75 d / 36 f of yarn. At this time, the temperature of the second high controller portion 5 is 120 ° C. (140 ° C. in Example 3), the temperature of the third high controller part 6 is 180 to 200 ° C., and the second high controller part 5 is 5 ° C. ) And the third high-detro controller section (6) was 0.95 ~ 0.98, the composite ratio was a weight ratio of the basic dye chlorinated polyester and basic dye fluorinated polyester to 1: 1.

Comparative Examples 1 and 2

The spinning was performed in the same manner as in Example 1, except that the speed of the first gode controller portion 4 was set at 900 m / min and 4,500 m / min, respectively.

Comparative Examples 3 to 4

The sacrifice was carried out in the same manner as in Example 1 except that the temperature of the second gode controller portion 5 was set to 80 ° C and 200 ° C, respectively.

Comparative Examples 5-6

The sacrifice was carried out in the same manner as in Example 1 except that the temperature of the third gode controller portion 6 was set to 130 ° C and 250 ° C, respectively.

The physical properties of the composite yarn according to Examples 1 to 5 and Comparative Examples 1 to 6 were evaluated, and the results are shown in Table 1.

1st high controller speed (m / min) Second gode controller part temperature (℃) 3rd high controller part temperature (℃) V3 / V2 Fair Fairness Yarn appearance Dichroic effect Example 1 2,000 120 200 0.95 ◎ ◎ ◎ Example 2 3,000 120 200 0.95 ◎ ◎ ◎ Example 3 2,000 140 200 0.95 ○ ◎ ○ Example 4 2,000 120 180 0.95 ○ ◎ ○ Example 5 2,000 120 200 0.98 ○ ◎ ○ Comparative Example 1 900 120 200 0.95 ○ × △ Comparative Example 2 4,500 120 200 0.95 × × × Comparative Example 3 2,000 80 200 0.95 △ △ △ Comparative Example 4 2,000 200 200 0.95 △ × △ Comparative Example 5 2,000 120 130 0.95 △ △ △ Comparative Example 6 2,000 120 250 0.95 × △ △

(◎: Excellent, ○: Good, △: Normal, ×: Poor)

[Property evaluation method]

* Sacrificial fairness: When wound for 24 hours with 9kg volume, it is judged to be excellent if the winding power is over 98%, good if more than 95%, normal if more than 92%, and poor if less than 92%.

* Yarn Appearance: Visually reads the side of a full cake and judges it to be excellent if the number of single thread or loop is 0, and bad if more than one

* Dichroic effect: The prepared yarn was cut into 10g of sample weight using a hose knitting machine, and then liquid ratio (weight ratio of sample at the time of dyeing) using a laboratory FR dyeing machine (Labomat) of Matisse. 20: 1, the salt concentration is set to 1% by weight of the sample, dyed for 20 minutes at 110 ℃, 20 minutes at 130 ℃ and visually read

As described in detail above, according to the method of the present invention, it is possible to economically prepare a dye-containing polyester composite yarn having excellent spinning processability, dyeing effect and dimensional stability after processing by a one step process.

Claims (8)

In the production of the dichroic polyester composite yarn, two components of the basic dye chlorinated polyester and the basic dye fluorinated polyester are simultaneously discharged through a spinneret arranged in a side-by-side manner. After stretching and heat treatment after the solidification, the method for producing a dibasic polyester composite yarn, characterized in that the winding by giving air entanglement in the interlacer. The method of claim 1, wherein the discharged two-component polyester is cold drawn in the first high controller section and the second high controller section, and then heat-treated in the second go controller section and the third go controller section. Method for preparing a dye-containing polyester composite yarn. The method of manufacturing a dibasic polyester composite yarn according to claim 2, wherein the speed of the first gode controller portion is 1,000 m / min to 4,000 m / min. The method according to claim 2, wherein the degree of orientation and shrinkage of the filaments drawn in the first and second high-detro controller sections satisfy the following formula: ΔN≤20 △ S≤10 (Wherein ΔN is the difference in the orientation of the basic dye fluorinated polyester and the basic dye salted polyester filament, and ΔS is the difference in shrinkage of the basic dye fluorinated polyester and the basic dye salted polyester filament). The method for producing a dibasic polyester composite yarn according to claim 2, wherein the temperature of the second gode controller portion is 100 ° C to 150 ° C. The method for producing a dibasic polyester composite yarn according to claim 2, wherein the temperature of the third high-detro controller portion is 160 ° C to 220 ° C. The method according to claim 2, wherein the speed ratio of the second and third high controller portions satisfies the following formula: 0.9≤V ₃ / V ₂ ≤1.0 (Wherein V ₂ is the speed of the second high-detro controller portion and V ₃ is the speed of the third high-detro controller portion). 2. The method of claim 1, wherein the basic dye salt polyester is a copolymer polyester having an intrinsic viscosity of 0.5 to 0.7 containing 0.5 to 1.5 mol% of metal sulfonate relative to terephthalic acid, and the basic dye fluorinated polyester having an intrinsic viscosity of 0.6 to 0.8 It is a linear polyethylene terephthalate, The manufacturing method of the dibasic polyester composite yarn.