KR100988976B1 - Polyester/Polyamide Splittable Conjugate Fiber and Manufacturing Method thereof - Google Patents

Abstract

The present invention relates to a polyester / polyamide split composite yarn and a method for manufacturing the same, wherein the first component is 98 to 99.9% by weight of polyester, and 0.1 to 2% by weight of polyamide 66, and the second component is polyamide. 6 and polyamide 66 are blended at a weight ratio of 3: 7 to 7: 3, and the second component is prepared by compounding the composite so as to be 10 to 35% by weight in the total composite fiber. According to the present invention, it is possible to produce split composite fibers having excellent high shrinkage and deep colorability with high productivity.

Polyester, polyamide, composite yarn, high shrinkage, productivity.

Description

Polyester / Polyamide Splittable Conjugate Fiber and Manufacturing Method

1A to 1C are enlarged cross-sectional views of a split composite yarn according to the present invention;

The present invention relates to a split type microfine fiber having high shrinkage and deep colorability, and excellent in productivity.

Conventional polyester / polyamide split composite fibers are obtained by complex spinning of two components of polyester / polyamide, and the composite fibers are made of polyester and polyamide parts through post-processing such as flammability, weight loss, and dyeing. Finally, single yarn fineness is made of ultrafine yarn of 0.2 denier or less. Split type composite fibers are being used in high value-added products such as cleaners and artificial leathers because of their excellent touch according to the characteristics of microfiber.

In order to apply such split type composite fibers as high value-added products, many technologies have been developed to have characteristics that are different from existing split type composite fibers. In particular, many methods for reforming polymers to have high color depth and high shrinkage have been studied. These reforming methods require a separate additive to be added to the polymerization process, which increases manufacturing costs and disadvantages in terms of processability. It is additionally required to develop a technology that maintains excellent post-processing and dyeing properties.

However, the method of making a flaw on the surface of the fiber by inorganic silica or titanium dioxide has a problem of deterioration of spinning workability in the production of microfibers due to their agglomeration, etc. It becomes difficult to apply.

In order to have high shrinkage property in polyester, a method of using a highly shrinkable copolyester polymer prepared by copolymerizing isophthalic acid at a constant ratio instead of terephthalic acid in a polyester polymerization process using general terephthalic acid and ethylene glycol is widely known. However, this method requires modification of the polymer through a separate polymerization process and thus can not contribute to the improvement of productivity. Therefore, development of a method of expressing high shrinkage characteristics by a method other than the polymerization reforming process is required.

As a method for increasing the productivity of polyester, a method of suppressing the yarn orientation during the spinning process by adding a heteropolymer is known. Since the elongation of the semi-drawn yarn produced according to the increase of the spinning speed decreases, the post-processing draw ratio also decreases, so that the productivity increase effect of increasing the spinning speed is generally negligible. However, in order to suppress the orientation during the spinning process by adding a heteropolymer to increase the productivity of the polyester, despite the increase in the spinning speed, the elongation of the manufactured yarn does not decrease and thus a high productivity increase effect can be obtained. This is due to the inverse relationship between the yarn spinning speed and elongation. As such a method of spinning with addition of heteropolymers, US Patent No. 4,609,710 adds polymethyl methacrylate additives to general denier yarns of 1 denier or more, not composite yarns, and at least 120% elongation at 1,500 to 8,000 m / min. It is described that semi-stretched yarns having the ability to be prepared, and EP 0.080.274 discloses a method of increasing productivity by adding incompatible polymers polyethylene, polyethylene glycol, alkali-soluble copolyester and the like to the polyester. This conventional technique deals with a method of increasing productivity for general single yarns of 1 denier class or more, and deals with productivity improvement of semi-stretched yarn.

The method of adding the heteropolymer to the polyester has the advantage of increasing the productivity, but there is a problem that the spinning workability is lowered depending on the heteropolymer to be added, and the dyeability and physical properties are poor. The semi-stretched yarn manufactured in this way can be made into a high value-added product by manufacturing false twisted yarn through a twisting process or by manufacturing a processed yarn through other yarns and a jointed yarn process, but it has a disadvantage in that the overall production cost increases due to an additional process. In addition, when a general flat drawer other than false twisted or processed yarn is required, the spin draw method that completes the drawing process in one step of the spinning process is more productive than the two-step process of spinning and winding the semi-drawn yarn and then going through a separate drawing process. It is difficult to apply the technique of preparing a semi-drawn yarn by adding a polymer.

 As a method of improving the productivity of the split type composite fiber obtained by complex spinning of polyester and polyamide, a method of increasing productivity by increasing the spinning speed is generally known, but a polyester having a high weight ratio between polyester and polyamide is known. Due to the elongation reduction effect of increasing the spinning speed, the productivity improvement effect is decreased. Can occur.

The present invention solves the problems of the method of increasing the productivity by adding the polyamide to the polyester portion and the polyamide portion using the copolymerized polyamide in the production of the polyester and polyamide split composite yarn, the degradation of the dyeing uniformity The present invention is to provide a polyester / polyamide split composite fiber having a high shrinkage and deep colorability with high productivity and a method of manufacturing the same.

In order to solve the problems described above, the present invention adds 0.1 to 2% by weight of polyamide 66, preferably 0.1 to 1% by weight, as an additive to the polyester melt melt as the first component. The present invention relates to a split composite yarn prepared by complex spinning in a conventional manner using a polymer obtained by blending amide 6 and polyamide 66 in a weight ratio of 3: 7 to 7: 3. At this time, the ratio of the first component and the second component is 65 to 90% by weight to 35 to 10% by weight, the winding speed is 3,200m / min or more up to 5,500m / min, preferably 4,800 at 3,500m / min or more up to m / min.

Finally, a master batch containing 10 to 35% by weight of polyamide 66, which is an additive to polyester (polyethylene terephthalate) or polybutylene terephthalate, is commonly used to add polyamide 66 as an additive to a polyester melt melt. In order to add the desired amount of polyamide 66 to 0.1 to 2% by weight, preferably 0.1 to 1% by weight, the polyamide portion of the second component polyamide 6 and polyamide 66 3: 7-7 : 3, preferably blended at a ratio of 1: 1 and added.

In this case, when more than 2% by weight of polyamide 66 is added to the polyester portion, the workability is poor, the dyeability of the yarn is also lowered and the manufacturing cost is also increased. In addition, when added at less than 0.1% by weight, there is almost no effect of improving productivity. In addition, when the ratio of polyamide 6 to polyamide 66 of the second component deviates from the ratio of 3: 7 to 7: 3, the deterioration in the orientation of the desired polyamide part is not achieved, resulting in a decrease in radioactivity.

In the present invention, when the second component is less than 10% by weight, the cross-sectional formation is poor and the desired cross-sectional shape cannot be obtained. As the ratio decreases, the spinning process conditions become unstable and there is a risk of poor physical properties.

In the form of the split composite yarn, the first component is branched radially from the center of the cross section of the composite fiber so as to form a wedge toward the center, and the second component is manufactured so as to be alternately arranged between the first component. The number of wedges is 8 ~ 32 to produce a split type composite yarn (Fig. 1a, 1b and 1c).

In the drawing of the split composite yarn, a spin draw method was applied in one step in the spinning process without a separate drawing process. A more detailed description is as follows.

In manufacturing polyester composite fiber by splicing polyester and polyamide polymer dried with high temperature dry air at 250 ~ 300 ℃, it prevents crystallization in the heat insulation part installed under the detention and cools in the cooling part installed under the heat insulation part. After cooling with air, focusing at the same time as the oil ring in the focusing and lubrication device at the bottom of the cooling section, the drawing is imparted and wound via conventional first and second rollers. At this time, the first gourd roller is 1,500m / min ~ 3,000m / min, preferably 2,000m / min ~ 3,000m / min so that the surface temperature is 70 ~ 100 ℃ and the second gourd roller is 3,500m / min ~ 5,500 m / min, preferably from 3,800m / min to 4,800m / min, with a surface temperature of 70 to 100 ° C, and wound up in a winding device with adequate tension.

The winding speed is preferably 3,500 m / min to 5,500 m / min, which is the winding speed of a general divided composite yarn spin draw yarn. When it exceeds 5,500 m / min, the winding is difficult due to the increase in the number of trimmers, so it is preferable to spin at a speed of 3,500 m / min or more.

In the present invention, in the production of the polyester split-type composite yarn, polyamide 66 was added as a heteropolymer to the polyester component, thereby suppressing the orientation and spinning at a higher speed, thereby increasing productivity. High shrinkage was achieved by lowering the surface temperature of the high-pressure roller to have high heat shrinkage. In addition, the composite spinning of polyester and polyamide prevented the reduction of post-processability such as spinning workability and flammability work due to heteropolymer injection and deterioration of dye uniformity. In addition, since the polyamide portion, which is the second component, was introduced by blending the polyamide 6 and the polyamide 66, the orientation of the polyamide portion was suppressed to achieve an increase in the dyeability in spinning and workability.

Advantages of the present invention as described above will be described in more detail with reference to Examples. However, the examples are not intended to limit the scope of the invention to aid the understanding of the invention.

EXAMPLES 1-2, COMPARATIVE EXAMPLES 1-4

Polyamide 66 was added to the polyester portion as shown in Table 1 to prepare split composite yarn spin-drawn yarn. At this time, polyamide 6 and polyamide 66 were blended in a 1: 1 ratio as a second component.

Polyester yarn spinning temperature 290 ℃, polyamide portion spinning temperature 270 ℃, spinneret 16 division type, diameter 0.23mm (36 holes), cold wind speed 0.4m / sec, fineness of 75 denier The discharge amount was adjusted so that the ratio of the polyester part / polyamide part was 80/20 weight ratio, and the spinning speed was changed as shown in Table 1. The results of Examples 1-2 and Comparative Examples 1-4 are shown in Table 1.

<Measurement method>

The heat shrinkage measurement and the post-process elution and dyeability of the split composite yarns were determined as follows for the samples knitted from 20 to 30 cm in length with a circular knitting machine.

-Heat shrinkage rate: After fixing the composite yarn sample to 50cm length and immersing it in boiling water for 30 minutes and drying at room temperature, the difference in the length of the sample before and after boiling water was divided by the length before adding as a percentage.

-Post process elution: The knitted samples were left at 100 ° C for 20 minutes in a 1.2% aqueous solution of sodium hydroxide with stirring and washed with pure water, and then the degree of splitting of the yarn was measured and measured by electron microscope.

-Dyeing test: Disperse dye Ko-Navy (S Type) was made with dye concentration 1% owf, and then prepared with 1g / L of dispersant (VGT), pH 5.0 (acetic acid), 1 to 15, and dyeing temperature at 125 ℃. After raising the temperature uniformly to 1 ℃ / min to ℃ and maintained at 125 ℃ 30 minutes.

-Color depth (K / S): In order to measure the color intensity of the dyed knitted sample was measured the absorption intensity at 500nm by using a spectrophotometer (Spectrophotometer).

-Productivity improvement: It can be said that it has high productivity if it can spin at a faster speed than the conventional method while having the same physical properties as the yarn manufactured by the conventional method. Compared with the existing technology, the increase in spinning speed was calculated as follows.

Productivity improvement (%) = (spinning speed of the present invention-spinning speed of the prior art)

 ÷ conventional spinning speed × 100

TABLE 1

* The apparent color concentration of the conventional polyester / polyamide split composite yarn that was not modified was converted to 100.

In Table 1, ◎ is very good, ○ is excellent, △ is normal, and × is poor.

As shown in Examples 1 and 2 of Table 1, an appropriate amount of polyamide 66 was added to the polyester component as the first component, and polyamide 6 and polyamide 66 were blended with 5: 5 or 6: 4 as the second component. In the case of composite spinning, the split type composite fibers having high heat shrinkage characteristics and excellent processability and dyeing of deep colors, while having strength and elongation equal to those of the composite spinning yarn according to the prior art of Comparative Example 1, could be manufactured with high productivity.

In Example 1 and Comparative Example 1, Example 1 was added 1% by weight of polyamide 66 to the polyester part, and 4,800m faster than 3,500m / min, which is the spinning speed of the split composite yarn according to the conventional technique of Comparative Example 1. It is possible to manufacture split composite yarns having excellent spinning processability, post process separation and deep color at /min.They can be manufactured at high spinning speed while having properties similar to those of Comparative Example 1, resulting in about 37% productivity improvement. Do. In addition, it is possible to produce a differentiated high shrinkage composite yarn with a heat shrinkage rate of 26%, which is much higher than the thermal shrinkage ratio of 10%, which is the existing split composite yarn. Also in Example 2, in the case where 0.5 wt% of polyamide 66 was added to the polyester portion and the polyamide portion was blended with polyamide 6 and polyamide 66 at 6: 4, productivity, heat shrinkage characteristics, spinning processability, and post-processing were similarly applied. Separation and color depth are improved. In Comparative Example 1, a conventional polyester / polyamide 6 split composite yarn was spun at 3,500 m / min, which is a comparative standard. In the case of Examples 1 and 2 according to the present invention, although the stretched yarn properties similar to those of Comparative Example 1 are exhibited at high speeds of 4,800 m / min or 4,500 m / min, the polymers of the prior art were spun at 4,800 m / min. In Comparative Example 2, as the spinning speed increases, the strength increases and the elongation decreases, resulting in a difference between the physical properties of Comparative Example 1, which is a reference, and the fact that the spinning workability is sharply dropped, thus making it impossible to produce. Comparative Example 3 was produced in the same manner as in Example 1 except that the polyamide portion was added in a polyamide 6: polyamide 66 ratio of 9: 1 and the surface temperature of the second gourd roller was 125 ° C. The process separability is good, but the spinning workability, color depth, and heat shrinkage characteristics are inadequate.

Comparative Example 4 under the same conditions as in Example 1, but increased the polyamide 66 content to 3% by weight in the polyester portion, it can be seen that the strength is lowered and the spinning processability is poor.

According to the present invention, a polyester / polyamide split composite yarn having excellent high shrinkage characteristics and deep colorability can be manufactured by using a conventional polyester composite yarn manufacturing facility with excellent productivity and processability.

Claims (3)

Polyester / polyamide split composite yarn, The first component is 98 to 99.9 wt% polyester and 0.1 to 2 wt% polyamide 66, and the second component is polyamide 6 and polyamide 66 blended at a weight ratio of 3: 7 to 7: 3. Polyester / polyamide split composite yarn, characterized in that it is. The polyester / polyamide split composite yarn according to claim 1, wherein the heat shrinkage is at least 20%. Method for producing a polyester / polyamide split composite yarn characterized in that the production through the following steps. i) using as a first component a polymer prepared from 98 to 99.9% by weight of polyester and from 0.1 to 2% by weight of polyamide 66, ii) blending polyamide 6 and polyamide 66 as a second component, but using a composite spinning so that the proportion of the second component in the total composite fiber is 10 to 35% by weight; iii) The first gouging roller has a speed of 1500 m / min to 3,000 m / min and a surface temperature of 70 to 100 ° C. iv) The second roller roller is stretched and wound up at a speed of 3,500 m / min to 5,500 m / min and a surface temperature of 70 to 100 ° C.

Images