KR100503437B1 - Manufacturing Method of Polyester Composite Fiber - Google Patents

Abstract

The present invention relates to a method for producing a polyester composite fiber by spinning two kinds of polyester by a side by side type composite spinning method, according to the present invention is a polyethylene terephthalate and a second component as a first component polymer Provided is a method for producing a polyester-based composite fiber comprising spinning a polytrimethylene terephthalate as a component polymer using a side byside type of composite spinning method. According to this method, it becomes possible to manufacture a polyester composite fiber exhibiting spontaneous high crimp characteristics in a relaxation heat treatment process with good spinning processability.

Description

Manufacturing method of polyester composite fiber

The present invention relates to a method for producing a polyester-based composite fiber, and more specifically, two kinds of polyesters having different intrinsic viscosities are spun to have a side by side cross-sectional shape in a fiber length direction. It relates to a method for producing a polyester composite fiber to exhibit spontaneous high crimping characteristics in the relaxation heat treatment process.

Conventionally, several methods are known as a method of manufacturing the side by side type composite fiber, and a representative one of them is polyethylene terephthalate (PET) and a copolymer thereof using a side by side type composite spinning method. It is a method of manufacturing. However, such a manufacturing method has a disadvantage in that physical properties of the copolymer are generally lowered, spinning processability is poor, and physical properties such as crimpability of the composite fiber are lowered.

Accordingly, an object of the present invention is to provide a polyester-based composite fiber of a side by side tie without the above disadvantages.

Polytrimethyl terephthalate (PTT) of polyethylene terephthalate and side-by-side type of composite spinning method which is excellent in fiber formability, excellent in elasticity, and shrinkage characteristics different from polyethylene terephthalate in the study of the present inventors for solving the above problems. When manufacturing the composite fiber by using it was found that the excellent spinning processability and the composite fiber exhibits a high crimping characteristics, the result is to complete the present invention.

Therefore, according to the present invention, the polyethylene terephthalate having an intrinsic viscosity of 0.55 to 0.65 as the first component polymer and the polytrimethylene terephthalate having the intrinsic viscosity of 0.7 to 1.0 as the second component polymer are prepared by using a side by side type complex spinning method. There is provided a method for producing a spontaneous highly elastic polyester-based composite fiber comprising spinning at an emission temperature of 280 to 300 ° C. such that the difference in applied viscosity between the two polymers is equal to or less than 1500 poise during spinning.

Hereinafter, the present invention will be described in more detail with preferred embodiments. According to a preferred embodiment of the present invention, polyethylene terephthalate is suitable to use intrinsic viscosity of 0.5 to 0.65, polytrimethylene terephthalate is used in the intrinsic viscosity of 0.7 to l side in the longitudinal direction of the fiber It is important to prepare a composite spun fiber having a bi-side cross section so that the difference in melt viscosity between the two polymers during spinning is less than 1500 poise. If the melt viscosity of the two polymers exceeds 1500 poise during spinning, the yarn will bend toward the higher melt viscosity under the spinning nozzle during spinning process, resulting in poor spinning processability and the degree of crimping obtained. It will be disadvantageous. On the other hand, in the case where the intrinsic viscosity of the two polymers used is outside the above range, the spinning and stretching processes are similarly poor.

According to the present invention, in order to make the difference in melt viscosity between the two polymers less than 1500 poise, it is appropriate to control the spinning temperature within the range of 280 to 300 ° C. The yarn after spinning is treated, for example, in a drawing machine at a drawing temperature of 70 to 110 ° C. and a heat treatment temperature of 160 to 200 ° C., followed by heat treatment in a relaxed state by dry heat or wet heat to produce a highly crimped composite fiber.

Hereinafter, the present invention will be described in more detail by way of example. However, the present invention is not limited to the following examples. Various physical property evaluation methods used in the following Examples and Comparative Examples are as follows.

◎ Intrinsic Viscosity (IV): After dissolving each polymer sufficiently in 1% concentration in ortho-chlorophenol at 120 ° C, it is measured using a Ubelrod viscometer in a 30 ° C thermostat.

◎ Melt viscosity (㎹): The polymer to be measured is sufficiently dried at 130 ° C. using a vacuum dryer, and then measured at a temperature of 250 ° C. using a capillarl type rheometer.

◎ Crimped water (K / inch): Apply 0.1g / d ultra-load to the sample, cut 500mm, remove super-load, and soak for 30 minutes in 100 ℃ boiling water. After drying, the short fibers were extracted to give an initial load of 0.1 g / d, and the number of crimps was measured with an optical microscope.

Example 1

The first component was spun with polyethylene terephthalate having IV of 0.63 and the second component was spun at 1100 m / min using a side-by-side spin nozzle at 285 ° C. using polytrimethylene terephthalate having IV of 0.8. . At this time, the difference between the two polymers was 800 poise. The thus obtained undrawn yarn was drawn at a draw ratio of 2.8 times, a drawing temperature of 90 ° C., and a heat treatment temperature of 180 ° C., and relaxation heat treatment was performed in water at 90 ° C. Table 1 below shows the difference in intrinsic viscosity and melt viscosity difference between polyethylene terephthalate and polytrimethylene terephthalate used in this example, and summarized in Table 1 by evaluating the spinning processability and the number of crimps.

Example 2

The same procedure as in Example 1 was repeated except that polyethylene terephthalate having IV of 0.63 was used as the first component and polytrimethylene terephthalate having IV of 1.0 was used as the second component. The difference in spinning time of the two polymers was 1400 poise.

Comparative Example 1

The same procedure as in Example 1 was repeated except that polyethylene terephthalate having IV of 0.58 was used as the first component and polytrimethylene terephthalate having IV of 1.1 was used as the second component. The difference in spinning time of the two polymers was 1800 poise.

Comparative Example 2

The same procedure as in Example 1 was repeated except that polyethylene terephthalate having IV of 0.58 was used as the first component and polytrimethylene terephthalate having IV of 1.3 was used as the second component. The difference in spinning time of the two polymers was 2100 poise.

TABLE 1

As can be seen from Table 1 above. Examples 1 and 2 having a melt viscosity difference of 1500 poise or less during spinning show better spinning processability and higher crimp number than those of Comparative Examples 1 and 2 exceeding 1500 poise.

Claims (1)

Polythene terephthalate having an intrinsic viscosity of 0.55 to 0.65 as the first component polymer and polytrimethylene terephthalate having an intrinsic viscosity of 0.7 to 1.0 as the second component polymer is formed by the side-by-side type of composite spinning method. A method for producing a spontaneous highly elastic polyester-based composite fiber comprising spinning at a spinning temperature of 280 to 300 ° C. such that the melting viscosity difference is 1500 poise or less.