KR20020007569A - Polyester partially oriented yarn and method of manufacturing thereof - Google Patents

Abstract

PURPOSE: A part drawn-yarn of polyester and a manufacturing method thereof are provided, which are characterized by having high residual elongation, increasing productivity because of no badness of spinning and winding, having uniform physical property and having excellent post-finishing operating property because of no noil and no cut-yarn in a drawing/false-twisting process. CONSTITUTION: The part drawn-yarn of polyester(POY) is obtained by a process containing the steps of: mixing the second ingredient having function restraining orientation and crystallization of polyester molecule with normal polyester polymer; and then melt-spinning and part-drawing at 4000-6000m/min. of spinning speed to have 100-180% of residual elongation. In the melt-spinning, the second ingredient is conjugated-spun by a conjugated spinning pack device. In a core part, concentration of the second ingredient is 0.4-2.0wt.%. In a sheath part, concentration of the second ingredient is 0.1-0.5wt.%. Area ratio of the sheath part is 70-90%. Area ratio of the core part is 30-10%.

Description

Polyester partially oriented yarn and method of manufacturing thereof

The present invention relates to a polyester partially drawn yarn prepared by a high-speed spinning method, and to a method for manufacturing the same, and more particularly, to produce a polyester partially drawn yarn having a high residual elongation under high speed spinning conditions, thereby improving productivity and in the combusting process. The present invention relates to a polyester partially drawn yarn containing a second component having excellent post-processability such as minimizing the generation of wool, and a manufacturing method thereof.

Recently, as the demand for polyester partially drawn yarns is rapidly increased, research into a method for producing polyester partially drawn yarns by a high-speed spinning method has been actively conducted to increase production yield as well as studies on stable production methods.

The most important research is to prepare a small amount of the second component polymer during the melt spinning process of the conventional polyester polymer.

The gist of this method is that the injected second component polymer is present between the polyester molecules to suppress the orientation / crystallization of the polyester molecules even at high spinning conditions, so that the residual elongation of polyester yarns produced at high spinning conditions is generally low. This is to make it almost similar to the residual oil elongation of polyester yarn produced under the spinning condition of.

U.S. Patent No. 5,993,712 discloses a method for producing polyester partially drawn yarns by mixing and adding a second component polymer by a high-speed spinning method.

This method uses high-speed spinning method by using a copolymer in which the acrylic component, styrene component and small amount of maleic acid are mixed / polymerized in a certain ratio in the spinning process as a second component polymer, by adding a small amount to the polyester polymer in the spinning step and uniformly dispersing it. It is a method of manufacturing polyester partial stretched yarn.

However, in the manufacturing method, since the second component polymer is dispersed not only inside each filament but also on the surface layer of the fiber, it causes a difference in each filament surface friction force and charging characteristic and is also dispersed on the filament surface by friction action with the winding guide. As the present second component polymer is eliminated, irregularities are formed on the surface of the filament, resulting in non-uniformity of filament concentration.

Therefore, such changes in surface properties and focusing properties of filaments frequently result in four-layer collapse, poor package shape, and severely broken thread during winding, resulting in poor winding workability, resulting in improved productivity by high-speed spinning. There was a drawback to not expect.

In addition, as a second component polymer having an orientation / crystallization inhibiting effect used, a special copolymer including an acrylic component, a styrene component, and a maleic acid component should be used. Therefore, in this method, a polymerization apparatus capable of preparing a second component polymer should be prepared. There was a disadvantage that additional facility investment factors such as

In addition, Japanese Patent Application Laid-Open No. 99-269,719 proposes a method of varying the dispersion concentration of the second component polymer dispersed in each polyester filament according to the cross-sectional area of the filament. When r is set to "r", approximately 50% of the second component polymer is densely dispersed within the range of r / 3 to 2r / 3, and the remaining 50% is present in the surface layer and the deep portion of the filament.

However, this method minimizes the change in surface properties due to the dispersion of the second component polymer on the filament surface because the dispersion concentration of the second component polymer in the fiber surface layer is reduced, but in this case the second component in the deeper portion Due to the low concentration of the polymer, the effect of suppressing the orientation / crystallization of the polyester molecules in the deep portion during high-speed spinning is not sufficient.

Therefore, the polyester partially drawn yarn by the high-speed spinning method prepared by the above technique has a disadvantage in that the productivity improvement effect is low because the residual oil elongation is not sufficient, and it is very difficult to concentrate the second component polymer in specific portions of each filament. Because of the difficulty, there was a difficulty in not being able to utilize conventional polyester spinning equipment.

The present invention can maximize the production increase effect according to the high-speed spinning by making the residual elongation of the polyester partial drawn even in high-speed spinning conditions similar to the residual elongation of the existing low-speed spinning partial drawn It is an object of the present invention to provide a polyester partially drawn yarn having excellent post-processing workability because there is almost no occurrence or trimming during the combustion process by minimizing the variation in physical properties between the filaments.

1 is a manufacturing process schematic diagram of the present invention

Figure 2 is an enlarged cross-sectional view of the multifilament produced by the present invention.

The present invention will be described in detail by way of example.

1 is a schematic view of the manufacturing process of the present invention, Figure 2 is an enlarged cross-sectional view of the partially drawn yarn produced by the present invention.

As illustrated in FIG. 1, the polymer constituting the surface layer portion I and the polymer constituting the deep layer portion II are extruded using the surface layer melt extrusion apparatus 1 and the deep layer melt extrusion apparatus 2, respectively, to form a radiation pipe 3. The polyester yarn containing the second component is melt-spun into the radiation beam 4 and the surface / depth composite radiation pack device 5 through the < RTI ID = 0.0 >

The discharge yarn 6 is cooled and solidified by cooling air in the cooling device 7 in a conventional manner, and then concentrated and emulsion-treated in the focusing / emulsion guide 8, and the first take-out roller 9 and the first Partial stretching between two take-up rollers 10 and winding at a winding machine 11 at a winding speed of 4,000 to 6,000 m / min produces a polyester partially drawn yarn (POY).

The second component polymer (B) used in the present invention generally uses an amorphous polymer which is incompatible with polyester and has a thermal property higher in glass transition temperature than that of ordinary polyester and lower than crystallization temperature. .

Specifically, as the polymethyl methacrylate polymer, the polystyrene polymer, the polycarbonate, or the like, a thermoplastic polymer having a glass transition temperature of 80 ° C or more and 120 ° C or less can be used.

At this time, in order to uniformize the surface layer / depth cross-sectional formation with the difference in concentration of the second component polymer (B) in each filament, a conventional pack layer (5) for spinning with a complex surface layer / deep structure is used.

The blended concentration of the prepared partially drawn yarn is low in the surface layer (I) portion of the filament on the basis of the filament cross section, and the concentration in the inner deep layer (II) is high.

In the present invention, the mixed concentration of the second component polymer and the complex ratio of the surface layer / depth for each part of the surface layer / depth part are very important for the spinning / coiling workability and the expression of residual elongation of the partially drawn yarn. Same as

First of all, when the mixing concentration of the second component polymer (B) incorporated into the surface layer portion (I) is higher than a certain content as a result of the mixing concentration, a decrease in spinning / winding workability due to a change in the surface properties of the filament appears. Significant difference occurs in the degree of orientation / crystallization with (II), resulting in surface damage such as cracking on the surface of the fiber, resulting in weakening of the strength of the partially drawn yarn, and weakening of workability of drawing and flamming (DT). .

On the other hand, the effect of the mixed concentration in the deep layer (II) is mainly related to the residual oil elongation and strength of the partially drawn yarn. If the concentration in the deep layer (II) is too low, the effect of inhibiting the orientation / crystallization of the polyester molecules is small. There is a disadvantage in that the expression is lowered, and if the concentration is too high, the residual oil elongation is excellent, but the workability of the post process becomes weak because the strength of the manufactured yarn is lowered.

In addition, the composite ratio of the surface layer (I) and the deep layer (II) has a high degree of suppression of orientation / crystallization of the manufactured polyester partially drawn yarn if the ratio of the surface layer (II) is too high, that is, if the ratio of the deep layer (II) is too low. Since the residual elongation of the polyester partially drawn yarn is decreased because the role of the deep portion is reduced, the productivity improvement by high-speed spinning is inferior. On the contrary, when the ratio of the surface portion (I) is too low, that is, the depth of the deep portion (II) If the composition ratio is too high, the surface / deep structure formation becomes unstable, resulting in non-uniform cross-sectional formation for each filament, resulting in non-uniform physical properties of the manufacturing yarn.

In the present invention, in order to prepare a polyester partially drawn yarn having a residual oil elongation of at least 100% at a spinning speed of 4,000 to 6,000 m / min, the mixed concentration of the second component polymer in the surface layer (I) and the deep layer (II) and the surface layer in the cross section The compounding ratio of the / depth part and the input content of the second component polymer relative to the total polyester polymer should satisfy the following conditions.

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1) Mixing concentration of two-component polymer for each part

-Surface layer: 0.1 wt% or more and 0.5 wt% or less compared to the polyester polymer

-Deep part: 0.4 wt% or more and 2.0 wt% or less of polyester polymer

2) Surface / Depth Composite Ratio

-Surface layer: 10% or more and 30% or less of the total fiber area

-Deep: 70% or more and 90% or less of the total fiber area

The second component polymer having the effect of suppressing the orientation / crystallization of the polyester molecule in the spinning process step of the polyester is utilized by utilizing the manufacturing method of the present invention, that is, a conventional yarn / depth composite composite manufacturing technique. ) And deep layer (II) using a method of mixed injection at a constant rate, when spinning at a spinning speed of 4,000 m / min to 6,000 m / min, the residual elongation is 100 to 180% and the polyester has a strength of 2.5 g / denier or more. Partially stretched yarns are obtained, and these stretched yarns are stretched and twisted with little or no trimming if they are stretched at a yarn speed of 800 to 1,200 m / min and a draw ratio of 1.3 to 2.4 times during the drawing / twisting process (DTY). Can be prepared.

Manufactured stretched, twisted yarn (DTY) has excellent strength / elongation and excellent post-processing such as weaving / dyeing.

Examples 1-5

The polyester partial stretched yarn was manufactured on the conditions of the spinning temperature of 285 degreeC, and the spinning speed of 5,000 m / min using the spinning equipment shown in FIG. 1 using the conventional polyester polymer whose intrinsic viscosity (IV) is 0.64 as a basis.

At this time, the second component polymer was mixed with the polyester raw material at the raw material inlet of the surface layer melt extrusion apparatus 1 and the deep layer melt extrusion apparatus 2, and the mixed concentration of the second component polymer for each part of the surface layer / deep portion was mixed. Table 1 shows the conditions such as the composite ratio of the surface layer portion / deep layer portion.

At this time, the second component polymer used was polymethyl methacrylate having a type name of 8N (MI = 2.5) manufactured by Rohm, Germany, and the discharge amount was adjusted so that the fineness of the final drawn yarn was 75 denier. .

In addition, the prepared partially drawn yarns were drawn under the conditions of the firing speed of 800 m / min and the heater temperature of 190 ° C., and were evaluated as post-workability such as drawing workability and generation of cows while being manufactured with DTY.

Comparative Examples 1 to 6

A polyester partially drawn yarn was prepared in the same manner as in Example except that the mixing concentration of the second component polymer in the surface layer portion and the deep portion, the composite ratio of the surface layer portion / depth portion, and the input content of the second component polymer were changed.

The conditions and physical properties of the manufacturing yarn applied at this time are shown in Table 2.

<Table 1>

Item unit Example 1 Example 2 Example 3 Example 4 Example 5 Exam conditions Second ingredient mixture concentration Surface layer weight% 0.1 0.2 0.2 0.4 0.5 Deep 0.4 0.8 0.8 1.5 2.0 Compound ratio Surface layer % 10 20 30 30 30 Deep 90 80 70 70 70 Test result Partial Drawing Company (POY) burglar g / denier 3.6 3.1 3.3 2.4 1.9 Shinto % 103.2 121.4 114.9 142.6 173.6 Radioactive --- ◎ ◎ ◎ ○ ○ Extension, false twisted yarn (DTY) burglar g / denier 4.9 4.5 4.6 4.4 4.2 Shinto % 28.4 29.3 30.5 29.1 28.5 Extensibility --- ◎ ◎ ◎ ○ ○

* 2nd component mixing concentration: 2nd component polymer input amount with respect to the weight of polyester polymer by each site | part

<Table 2>

Item unit Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Exam conditions Second Component Mixing Concentration Surface layer weight% --- --- 0.6 0.1 0.5 0.1 Deep --- 1.0 1.5 0.3 2.5 0.9 Compound ratio Surface layer % 50 20 30 10 30 40 Deep 50 80 70 90 70 60 Test result Partial Drawing Company (POY) burglar g / denier 4.1 2.3 2.3 3.9 1.4 3.6 Shinto % 64.2 126.3 154.8 89.3 198.4 98.4 Radioactive --- ◎ ○ △ ○ △ ◎ Extension, false twisted yarn (DTY) burglar g / denier 5.1 3.8 4.1 4.8 3.4 4.6 Shinto % 28.1 29.5 30.8 31.5 33.1 29.5 Extensibility --- ◎ △ × ○ × ◎

* Mixing concentration of the second component: weight of polyester polymer for each part

Second Component Polymer Dose

<Evaluation Method>

1. Radioactivity: Very good (◎) for no trimming on the basis of 24 hours, excellent (○) for less than one trimming, normal (△) and trimming on two or more trimmings. When it exceeds 2 times, it evaluated as defect (x).

2. Elongation: DTY produced by setting elongation ratio to show 30% elongation is very excellent (◎) when there is no occurrence of rain, and excellent (○) and 0.6-1 by 1 when occurrence of rain is 0.5 / kg. In the case of / kg, it was evaluated as normal (△), and when it exceeds 1 / kg as the defect (x).

3. Strength / Elongation of Manufactured Yarn: The results were measured under the condition of 20cm of sample length and 100mm / min of tensile speed.

The present invention not only exhibits high residual oil elongation even at high spinning conditions, but also does not exhibit poor spinning / wound workability due to the mixed-injected second component polymer as in the prior art, thereby making it possible to manufacture polyester partially drawn yarn with high productivity. .

In addition, the polyester partially drawn yarn has uniform properties such as strength, and hardly generates wool or trimming during the drawing / flamming process, and thus has excellent post-workability.

Claims (6)

In preparing polyester partially drawn yarns (POY), melt spinning and partial stretching are carried out at a spinning speed of 4,000 to 6,000 m / min by mixing a second component of the orientation / crystallization inhibiting ability of polyester molecules with a conventional polyester polymer. However, when the mixed concentration of the second component is large, the mixture is spun in a surface / deep composite spinning pack device so that the mixed concentration of the second component is in the core portion, and that in which the second component is less is in the surface portion (Sheath). Method for producing a polyester partially drawn yarn, characterized in that the manufacturing to be%. As the polyester partially drawn yarn, the core portion contains a high concentration of the second component having the orientation / crystallization inhibiting ability in the conventional polyester polymer, and the surface portion (Sheath) contains the second component in the conventional polyester polymer. It is contained in a low concentration, polyester partial stretched yarn, characterized in that the area ratio of the surface (Sheath) is significantly larger than the area ratio of the core (Core). The polyester partially drawn yarn according to claim 2, wherein the concentration in the deep portion of the second component relative to the polyester polymer is 0.4 to 2.0 wt%, and the concentration in the surface portion is 0.1 to 0.5 wt%. The polyester partial stretched yarn according to claim 2, wherein the area ratio of the surface layer portion is 70 to 90%, and the area ratio of the deep layer portion is 30 to 10%. 3. The polyester partially drawn yarn according to claim 2, wherein the second component is a thermoplastic polymer which is amorphous, incompatible with conventional polyester polymers, and has a glass transition temperature of 80 to 120 ° C. 6. The polyester partially drawn yarn according to claim 5, wherein the second component is selected from polymethylmethacrylate, polystyrene, polycarbonate, and the like.