KR950007815B1 - Method for the preparation of a mixed yarn with differantial construction - Google Patents

Abstract

The high shrinkable modified polyester half-extended yarn which is obtained from the polymer being manufactured by adding the physical property antideteriorant, which is an organic intermediate being obtained by the addition of ethylene oxide or propylene oxide to bisphenol A, and the high specific gravity modified polyester half-extended yarn which is obtained from the polymer being manufactured by adding the ceramic additives are extended and heat treated at 180-190≰C and then air switch treated under the tensile force to give the polyester blended yarn.

Description

Manufacturing method of biaxial blended yarn with excellent drape

1 is a schematic diagram of a manufacturing apparatus used in the present invention.

Figure 2 is an enlarged photograph showing the structure of the yarn produced by the present invention.

3 is an enlarged photograph showing the surface structure of the woven fabric produced by the present invention.

* Explanation of symbols for main parts of the drawings

1: high shrink modified polyester semi-stretched yarn 2: high specific gravity modified polyester semi-stretched yarn

3: first drawing roller 4: heat treatment hot plate

5: 2nd extension roller 6: tension control device

7: air duct treatment device 8: winding device

The present invention relates to a method for producing a bisulfate blended yarn having excellent drape property, characterized in that the high-density-modified polyester having excellent drape property and the high-stretched modified polyester yarn having high shrinkage and the multi-stranded yarn having been shredded are plied in multiple stages. Specifically, high shrinkage modified polyester semi-stretched yarn having excellent shrinkage difference of 0.1 (hereinafter referred to as "high shrinkage yarn") and high specific gravity modified polyester semi-drawn yarn having excellent drape property (hereinafter referred to as "low shrinkage yarn") ) Is manufactured by multi-stage stretching method and mixed by using tension control device and air throttling device, and has an elegant gloss and appearance similar to artificial dogs, and has a specific gravity of 1.43 g / cm ³ or more. It is about.

Conventional methods for producing fabrics with similar characteristics to artificial dogs are designed to produce yarns with hexagonal to octagonal petals to produce a gloss effect on artificial dogs (Il57-38695) and semi-shrink modified polyester It has been proposed a method (manufactured by Japanese Patent Application No. 55-12013, Japanese Patent Application No. 58-28373) for producing a shrine and ordinary polyester semi-stretched yarn by di-shrink blending in a drawing machine.

However, in the former method, since only the cross section was deformed, physical properties similar to those of the artificial dog could not be obtained, and in particular, the drape property was not excellent. In addition, the latter method succeeded in expressing natural gloss by adding fine particles to the raw material of modified yarn of high shrinkage yarn, but the specific gravity is similar to that of ordinary polyester (1.38g / cm ³ ). There was a disadvantage of low sex.

Accordingly, an object of the present invention is to provide a method for producing a biaxial blended yarn for producing a polyester fabric having excellent draping property and elegant gloss of artificial dog.

In order to achieve the above object as well as another object that is easily expressed, in the present invention, a high-density modified polyester semi-stretched yarn having improved specific gravity by increasing the specific gravity of the raw material is produced, and then highly shrink-modified polyester ductile having excellent shrinkability. The tension control device was used to mix with the gentleman, but it can be manufactured at the normal drawing ratio and drawing temperature in the drawing process, and the specific gravity difference with the conventional polyester is 0.1 ~ 0.13g / The manufacturing method of the biaxial blended yarn which was excellent in the drape property which is about cm <^3> developed.

The present invention is described in more detail as follows.

In general, the polyester fiber is not a structure that can increase the specific gravity by itself because the structure is dense, it is usually added fine particles to increase the specific gravity of the fiber, during polymerization, the fine particles are dipped because of the heavy. In addition, excessive addition of fine particles resulted in inadequate synthesis during polymerization, uneven physical properties of the needle and the pack pressure during spinning, and only partial unstretched for stretched yarns, making it impossible to use as a final fabric.

Therefore, in the present invention, a high-shrinkage modified polyester copolymer having a non-shrinkage of 30% or more was obtained by adding a suitable monomer in the polymerization reaction step of the polymer slurry and condensation polymerization, and the yarn prepared therefrom was used as the high shrink yarn. During the spinning process, the high specific gravity filter is mixed with the general polyester polymer to be uniformly distributed in the inside of the polyester fiber, and then the surface cutter of the yarn is removed in the post process to increase the depth of color due to diffused reflection of light, A bishrink blended yarn was prepared by blending using a high specific gravity modified polyester stretched yarn having a low shrinkage yarn. In other words, using a shrink-modified polyester copolymer and a high specific gravity modified polyester copolymer, but using a special spinning method and a multi-stage stretching method and then spun together using an air entanglement apparatus. The biaxial blended yarn with excellent drape property was prepared by protruding high specific gravity yarn on the fabric surface in post processing.

In the present invention, as the high shrink yarn, a high shrinkable modified polyester having improved shrinkage while maintaining excellent physical and chemical properties of the polyester fiber was used. In other words. In the manufacture of conventional polyesters, additives were used to change the structure of conventional polyesters in the polymerization step to expand the amorphous region to have cross-linking structure between molecules, and at this time, bisphenol A to ethylene oxide or propylene The organic polymer to which the oxide was added was used.

Isophthalic acid was used as an additive used in the preparation of the highly shrinkable modified polyester, and the addition amount is preferably 2 to 10 wt% based on the weight of the polyester. It is preferable to add 2 to 5 wt% of the physical property inhibitor. When the additive is used less than 2wt%, there is a problem that the shrinkage is reduced, when used in excess of 10wt%, there is a problem that the physical properties are deteriorated due to the destruction of the fiber structure, poor spinning, weedability, and less than 2wt% In this case, there is a disadvantage in that the shrinkage of the fiber structure is not maintained, and when used in excess of 5wt%, there is a problem that the fiber structure is destroyed.

It is preferable that the prepared high shrinkage modified polyester copolymer has a specific shrinkage of 30% or more. Shrinkage acts on both ends of the jetting chain by rotation around the bond of the segments constituting the molecular chain even though the molecular chain has the most stable structure, which in turn acts as the shrinking force of the fiber.

In the present invention, the high specific gravity modified polyester copolymer has a specific gravity higher than that of conventional titanium dioxide in order to increase the specific gravity of the polyester during the conventional polyester polymerization, and is added by adding an additive which is not dissolved by the loss of alkali in the subsequent process. Manufacture. At this time, in order to improve the color development according to the reflectance, the refractive index must be selected as an additive in the range of 1.4 ~ 1.7, which is similar to that of polyester.If the size is very small, the surface area is widened, and thus the affinity between particles is improved, which is coarse. Since particles are generated and cause ball uniformity, low specific surface area and good particle size distribution should be selected as additives.

As an additive, at least 1 type can be selected from the group which consists of titanium, silver, barium sulfate, etc. ceramics, and the addition amount is effective to add 7-15 weight% with respect to 10 weight% of polyester polymers.

If the added amount exceeds 15% by weight, the dispersibility is poor, and trimming occurs. If the added amount is less than 7% by weight, there is a disadvantage in that the drape property of the final fabric is insufficient.

On the other hand, since the color development depends largely on the cross-sectional shape of the fiber, it is preferable to change the cross section of the yarn from a circle to a triangular cross section or a polygonal cross section in order to improve color development, and the color development is improved as incident light is scattered and absorbed in the uneven portion. In order to use it, it is necessary to design an uneven structure with an exaggerated amount of visible light (0.4 μ-0.8 μ). In the present invention, unevenness is formed by alkali reduction processing in a later process.

Particularly, in the present invention, barium sulfate is added to increase specific gravity instead of titanium dioxide, which has been used to express existing natural gloss. When the barium sulfate is less than 10%, the absolute viscosity of the polymer is 0.60 to 0.50, and 30%. If used in excess, the absolute viscosity falls below 0.4. However, in order to yarn the polymer, the viscosity should be maintained at least 0.5, so that the viscosity should not exceed 15% of the amount of barium sulfate added.

On the other hand, since the additives are heavier than polyester resin in the polymerization process, the specific gravity of the additive proceeds in one direction, so it is difficult to accurately predict the viscosity in the reactor. Therefore, the dispersibility of the additives in the polymer should be improved by increasing the stirring speed. do. In addition, since the coarse particle size of the additive is 0.5 μm or less, the surface area is wide and the cohesive force is strong, causing pack pressure increase and poor dyeing. Therefore, the above problems should be solved by properly dispersing the additive system during polymerization.

After the synthesis of high shrinkage, high specific gravity polyester polymer as described above, the produced chip is dried to less than 0.003% process water, each into a different hopper, melt-extruded through an expander, and then the gear pump By using a certain ratio, the melted components were introduced into different packs, so that undrawn yarn was formed according to the nozzle type. In addition, in order to improve the cooling effect, the oil feed and yarn focusing guides were installed at the top of the private conductive pipe, and the yarn density was improved by improving the focusability of the yarn discharged from the discharge port. At this time, the spinning temperature of the high shrinkage yarn and the high specific gravity yarn is suitable to 270 ℃ ~ 280 ℃, the basic properties are similar to the conventional polyester at this temperature, in particular, when the room temperature exceeds 280 ℃ melt temperature in the thermal properties of the copolymerization ( Tm) is lowered, but the strength is lowered and the elongation is increased, so the physical properties are lowered.

In general, as the spinning temperature increases, polyester molecular fluidity is smoothed, increasing elongation and heat shrinkage but decreasing strength. However, if the spinning temperature exceeds 280 degrees Celsius, the radioactive defect and the physical properties of the yarn is reduced.

High shrinkage yarns and high specific gravity yarns increase the strength and decrease the elongation because the orientation between molecules increases as the spinning speed increases. On the contrary, when the speed of radiation decreases, elongation increases. Since there are many amorphous portions between molecules, the heat shrinkage rate increases but the strength decreases. Therefore, in consideration of the above problems, it is preferable to set the spinning speed in the range of 1250 m / min to 1500 m / min.

According to the accompanying drawings in detail the sacrificial process as follows.

1 is a process illustration for producing a bishrink blended yarn of the present invention, a high shrinkage modified polyester semi-stretched yarn (1) as a component of a high shrinkage yarn, a high specific gravity modified polyester semi-drawn yarn ( 2) are used, but through the first stretching roller (3) fixed at 75 ℃ to 85 ℃ in order to uniform the component arrangement of the spinning high and low shrink yarn yarns (180 ℃ ~ l90 ℃ heat treatment hot plate (4) After the heat treatment for 0.01 ~ 0.1 seconds, passes through the second stretching roller (5) of 180 ~ l90 ℃ and adjust the tension with the tension control device (6).

At this time, the tension of the yarn is 2g-15g is suitable, but less than 2g has a disadvantage that the winding state is poor, and if it exceeds 15g, the trimming occurs. The tension-controlled yarn is wound up after passing through the air interlocking device (7). When the number of interlaces in air entanglement is 70-100 per meter, it has excellent maritime and textile feel, and there is no occurrence of hair. If it is less than 70, the peach skin effect of the fabric surface is very small, and if it is more than 100, the maritime property is poor.

When the specific gravity of the biaxial hybrid yarn manufactured by the above method is 1.43 or more, the surface of the fabric is excellent in drape and elasticity, but less than 1.43, the drape and elasticity are poor.

The following examples and comparative examples further illustrate the invention, but do not limit the scope of the invention.

Example 1

High shrink-modified polyester semi-finished with a non-shrinkage ratio of 30%, prepared by adding 4 wt% of isophthalic acid to the final produced PET and 3 wt% of an organic intermediate in which ethylene oxide was added to bisphenol A as a physical property inhibitor in a conventional PET manufacturing step. PET, which is directly esterified by gentleman, terephthalic acid and ethylene glycol, is added to 10 wt% of barium sulfate to draw a high-density-modified polyester semi-stretched yarn with a stretching ratio of 3.25 and a temperature of the first stretching roller at 80 캜, followed by stretching at 185 캜. After heat treatment for 0.03 sec on the heat treatment hot plate, pass the 2nd extension roller at 185 ° C, increase the tension of the tension control device to 10g, and transfer the interlace from the air throttling device to equalize the shrinkage expression of high and low shrinkage. The heat shrinkage was 20% and the specific gravity was 1.43 when winding up to 80 pieces per meter. Table 1 shows the physical properties of the woven fabric of the bi-shrink blended yarn prepared by knitting.

Comparative Example 1

The same procedure as in Example 1 was carried out except for the use of ordinary polyester blank stretched yarns in place of the high specific gravity modified polyester semi-drawn yarns.

Comparative Example 2

Except for setting the tension of the tension control device to 20g was the same as in Example 1, and to evaluate the physical properties and properties are shown in Table 2.

Comparative Examples 3 to 4

The same procedure as in 1 was carried out except that the air interlock was used but the number of interlaces was 40 (Comparative Example 3), and the air interlock was not used (Comparative Example 4). The results are shown in Table 3.

Comparative Example 5

It carried out similarly to Example 1 except having used normal polyester semi-stretched yarn (effect yarn) as a high shrink yarn and a low shrink yarn. At this time, the heat shrinkage rate was 10%, specific gravity was 1.38, and the properties and characteristics thereof were evaluated and listed in Table 4 below.

TABLE 1

TABLE 2

TABLE 3

TABLE 4

* Property evaluation method

1.Heat Shrinkage: Moist Heat Measurer (10 ℃ × 30min)

2. Specific Gravity: Electronic Densimeter SA-l20L

3. Yarn appearance: SEM photo evaluation

4. Navalability: Criteria for the accumulator

5. Cattle occurrence: Cattle tester evaluation criteria

6. Fabric Tactile: KES-SYSTEM Evaluation Criteria

7. Drape: Evaluation Standard (KES-SYSTEM) on handle measuring instrument

8. Elasticity: (KES-SYSTEM) evaluation standard on handle measuring instrument

As can be seen from Tables 1 to 4, when the tension is 16g or more, the workability over-exterior appearance is poor, and when the air interlocking process using the air interlocking device is used, the interlacing per meter is 70 ~ 100 per meter. It was excellent in the feel of wool, fabrics and fabrics. When the specific gravity was over 1.43, the drape and elasticity were good, but when the specific gravity was less than 1.43, the drape and elasticity were poor.

Claims (4)

High specific gravity obtained from polymers prepared by adding isophthalic acid additives and bisphenol A to the polymer prepared by adding a physical property inhibitor of an organic intermediate having ethylene oxide or propylene oxide added thereto. A method for producing a polyester biaxially blended yarn having excellent drape property, wherein the modified polyester semi-drawn yarn is drawn and subjected to air entanglement under tension after heat treatment at a temperature of 180 to 190 ° C. The method of claim 1, wherein the tension of the semi-stretched yarn to be supplied is adjusted to 2 to 15 g, and the number of interlaces per meter is adjusted to 70 to 100 at air interlacing treatment. The method of claim 1, wherein the heat shrinkage rate of the blended yarn is 20% to 25%. The method of claim 1, wherein the spinning temperature of the high shrinkage yarn and the high specific gravity yarn is adjusted to 270 to 280 ° C, and the spinning speed is adjusted to 1250m / min to 1500m / min.