KR100785237B1 - Sheath-core type polyester composite fiber and its manufacturing process - Google Patents

Abstract

The present invention uses a polyethylene terephthalate copolymer containing 1.0 to 5.0% by weight of titanium dioxide ceramic component in the core portion, 1.0 mol% to 3.0 mol% of sulfoisophthalate in the polymer chain, and titanium dioxide in the sheath portion. Using a polyethylene terephthalate copolymer containing 0.02 to 0.5% by weight of the ceramic component and 1.0% to 3.0% by weight of sulfoisophthalate in the polymer chain, the ratio of the fiber cross-sectional area of the core portion and the sheath portion was 40 area%. It relates to a polyester sheath-core composite fiber made by a conventional composite yarn melt spinning process so as to be 60 to 90 area% to 10 area%.

The polyester sheath-core composite yarn according to the present invention can be dyed with a cationic dye, has excellent fastness, has excellent opacity by a ceramic component, and improves spinning workability because the ceramic component does not protrude to the yarn surface. In post-processing processes such as dressing and weaving, the wear of the guides is significantly reduced, resulting in excellent screening.

Ceramic, Sheath-core, Composite Fiber, Opaque, Cationic Dye

Description

Polyester sheath-core composite yarn and its manufacturing method {Sheath-core type polyester composite fiber and its manufacturing process}

The present invention relates to a polyester sheath-type composite yarn and a method for manufacturing the same, which can be dyed with a cationic dye, which has excellent fastness, opacity, excellent radiation workability, and low friction with a guide in a post-processing process. The polyester ciscore-type composite yarn according to the present invention can be dyed with a cationic dye, so it has a bright color, excellent fastness, and can be mainly used in swimwear and ski suits requiring non-impregnation because it has an opaque property.

Prior arts related to polyester ciscore-type composite yarns that can be dyed with cationic dyes include U.S. Patent No. 4,604,320, which is characterized by excellent strength and dyeing with cationic dyes, and U.S. Pat. When dyed and used as a drawtextured yarn, it is characterized by excellent strength and bulkiness. Rather than merely a polyester composite yarn dyed with a cationic dye, the present invention can be dyed with a cationic dye and has an opaque property due to a ceramic component. This has the technical effect of remarkably preventing the guide work in the post-processing process such as deterioration of radiation workability and diameter or weaving.

In addition, US Patent No. 6,531,218 relates to a polyester sheath core composite yarn, the core portion is composed of a core polymer that can be easily dyed in the dye solution, the sheath portion is composed of a sheath polymer resistant to dyeing in the dye solution When the filament is brought into contact with the dye solution containing the dye compound, the dye compound passes through the cis polymer and is physically dispersed to be well dyed in the core polymer. However, in this case, since the core part and the sheath part are not dyed in the same way, there is a problem that the dyeability is poor.

The present invention allows the core component and the sheath component to be dyeable with the same cationic dye so that the core portion and the sheath portion can be uniformly dyed with the cationic dye under the same conditions, and the core portion contains a large amount of ceramic components and is opaque. The sheath portion is intended to provide a polyester Cisco-type composite yarn and its manufacturing method to contain a small amount of ceramic components to prevent guide wear.

In the present invention, the core portion contains 1.0 to 5.0 wt% of titanium dioxide ceramic component, and any one of three kinds of 5-sodium sulfoisophthalate, 5-lithium sulfoisophthalate, and 5-potassium sulfoisophthalate is used in the polymer chain. Polyethylene terephthalate copolymer containing 1.0 mol% to 3.0 mol% in the inside, the sheath portion containing 0.02 to 0.5% by weight of titanium dioxide ceramic component, 5-sodium sulfoisophthalate, 5-lithium sulfoisophthalate, Using a polyethylene terephthalate copolymer containing any one of three 3-potassium sulfoisophthalates in the polymer chain in a polymer chain, the ratio of the fiber cross-sectional area of the core part and the sheath part is 90 area% to 10 area. It relates to a polyester ciscore-type composite fiber which is from% to 40 area% to 60 area% and a method of manufacturing the same.

In the present invention, when the titanium dioxide ceramic component of the core portion is less than 1.0 wt%, it does not have an opaqueness to be described later, and when it exceeds 5.0 wt%, the titanium dioxide content is excessive, making it difficult to control the polymerization process, and thus it is not easy to manufacture a polymer. The opaque effect no longer increases significantly.

In the present invention, if the titanium dioxide ceramic component of the sheath portion is less than 0.02% by weight, there is no irregularities on the surface of the yarn, so that the surface area of the yarn that comes into contact with the metal part or the guide part of the machine during the spinning process or the post-processing process is increased. The yarn-metal friction is increased, resulting in poor workability. In addition, when the titanium dioxide ceramic component exceeds 0.5% by weight, a large amount of irregularities are formed on the surface of the yarn, and when the irregularities come into contact with the metal part or the guide part of the machine during the spinning or post-processing process, the yarn is mainly broken in the metal part and the guide part. In the unevenness of the yarn caught in the guide, the yarn is broken or the guide is worn. On the other hand, when the titanium dioxide ceramic component is in the range of 0.02 to 0.5% by weight, appropriate irregularities are formed on the surface of the yarn, which reduces the surface of the yarn that comes into contact with the metal part or the guide part of the machine during the spinning process or the post-processing process. Workability is excellent because it is not caught by the guide part.

In addition, in the present invention, if the fiber area ratio of the core portion is less than 40 area%, the opacity to be realized in the present invention may not be properly expressed. On the contrary, if the fiber area area ratio exceeds 90 area%, the sheath portion may not sufficiently surround the core portion. It is not possible to prevent the phenomenon of contact with the metal part or the guide part of the machine during the spinning process or the post-processing process.

Hereinafter, the present invention will be described in detail through Examples and Comparative Examples. However, the present invention should not be interpreted as being limited only to these examples.

Example 1

Using the conventional spin-draw composite yarn spinning equipment having two sets of rollers, the core part is made up to 85% of the cross-sectional area of the composite yarn, and the titanium dioxide ceramic component is 1.5% by weight and 5-sodium silicate. Polyethylene terephthalate copolymer containing 1.8 mol% of isophthalate was used, and the sheath portion was 15% of the cross-sectional area of the total composite yarn, and 0.2 wt% of titanium dioxide ceramic component and 5-sodium sulfoisophthalate were used. It was set as the polyethylene terephthalate copolymer containing 1.8 mol%. In this way, a polyester sheath-core composite yarn of 50 denier / 24 filaments was obtained.

The dough made by hanging the polyester ciscore-type composite yarn in a circular knitting machine was dyed with a cationic dye using a liquid dyeing machine, and then processed paper was manufactured through a final setting process. The opacity of the dough and the dyeing fastness of the processed paper were evaluated and shown in Table 1.

In addition, after the polyester ciscore-type composite yarn was worked for 48 minutes with a regular Gyeonggi, the number of defects per 10 million m was converted into Table 1 and shown.

Example 2

Using a conventional spin draw method of the composite yarn spinning equipment having two sets of rollers, the core portion has an area corresponding to 85% of the cross-sectional area of the total composite yarn, and the titanium dioxide ceramic component is 2.5% by weight and 5-sodium silicate. It was composed of polyethylene terephthalate copolymer containing 1.8 mol% of isophthalate, and the sheath portion was 15% of the cross-sectional area of the total composite yarn, 0.03% by weight of titanium dioxide ceramic component and 5-sodium sulfoisophthalate. It consisted of the polyethylene terephthalate copolymer containing 1.8 mol%. In this way, a polyester sheath-core composite yarn of 50 denier / 24 filaments was obtained.

Dough made of this polyester ciscore-type composite yarn by circular knitting machine was dyed with a cationic dye using a liquid dyeing machine, and then processed paper was manufactured through a final setting process. The opacity of the dough and the dyeing fastness of the processed paper were evaluated and shown in Table 1.

In addition, after the polyester ciscore-type composite yarn was worked for 48 minutes with a regular Gyeonggi, the number of defects per 10 million m was converted into Table 1 and shown.

Example 3

 Using a conventional spin draw method of the composite yarn spinning equipment having two sets of rollers, the core area is 60% of the cross-sectional area of the composite yarn, and 1.5 wt% of titanium dioxide ceramic component is used. It consists of polyethylene terephthalate copolymer containing 1.8 mol% of isophthalate, and the sheath part covers an area corresponding to 40% of the cross-sectional area of the total composite yarn, 0.2 wt% of titanium dioxide ceramic component and 5-sodium sulfoisophthalate. It consisted of the polyethylene terephthalate copolymer containing 1.8 mol%. In this way, a polyester sheath-core composite yarn of 50 denier / 24 filaments was obtained.

Dough made of this polyester ciscore-type composite yarn by circular knitting machine was dyed with a cationic dye using a liquid dyeing machine, and then processed paper was manufactured through a final setting process. The opacity of the dough and the dyeing fastness of the processed paper were evaluated and shown in Table 1.

In addition, after the polyester ciscore-type composite yarn was worked for 48 minutes with a regular Gyeonggi, the number of defects per 10 million m was converted into Table 1 and shown.

Comparative Example 1

Using the conventional spin draw method of composite yarn spinning equipment having two sets of rollers, the core part is made up to 85% of the cross-sectional area of the composite yarn, and 0.5 wt% of titanium dioxide ceramic component is used. It consists of polyethylene terephthalate copolymer containing 1.8 mol% of isophthalate, and the sheath portion is 15% of the cross-sectional area of the total composite yarn, and 0.5 wt% of titanium dioxide ceramic component and 5-sodium sulfoisophthalate It consisted of the polyethylene terephthalate copolymer containing 1.8 mol%. In this way, a polyester sheath-core composite yarn of 50 denier / 24 filaments was obtained.

Dough made of this polyester ciscore-type composite yarn by circular knitting machine was dyed with a cationic dye using a liquid dyeing machine, and then processed paper was manufactured through a final setting process. The opacity of the dough and the dyeing fastness of the processed paper were evaluated and shown in Table 1. In addition, after the polyester ciscore-type composite yarn was worked for 48 minutes with a regular Gyeonggi, the number of defects per 10 million m was converted into Table 1 and shown.

Comparative Example 2

Using a conventional spin draw method of the composite yarn spinning equipment having two sets of rollers, the core area is 60% of the cross-sectional area of the composite yarn, and 1.5 wt% of titanium dioxide ceramic component is used. It was composed of polyethylene terephthalate copolymer containing 1.8 mol% of isophthalate, and the sheath part was made up to 40% of the cross-sectional area of the total composite yarn, 1.5 wt% of titanium dioxide ceramic component and 5-sodium sulfoisophthalate. It consisted of the polyethylene terephthalate copolymer containing 1.8 mol%. In this way, a polyester sheath-core composite yarn of 50 denier / 24 filaments was obtained.

Dough made of this polyester ciscore-type composite yarn by circular knitting machine was dyed with a cationic dye using a liquid dyeing machine, and then processed paper was manufactured through a final setting process. The opacity of the dough and the dyeing fastness of the processed paper were evaluated and shown in Table 1.

In addition, after the polyester ciscore-type composite yarn was worked for 48 minutes with a regular Gyeonggi, the number of defects per 10 million m was converted into Table 1 and shown.                     

Comparative Example 3

Using a conventional spin draw method of composite yarn spinning equipment having two sets of rollers, the core portion is 30% of the cross-sectional area of the composite yarn, and the titanium dioxide ceramic component is 2.5% by weight and 5-sodium solution is used. It consists of polyethylene terephthalate copolymer containing 1.8 mol% of isophthalate, and the sheath part covers an area corresponding to 70% of the cross-sectional area of the total composite yarn, 0.2 wt% of titanium dioxide ceramic component and 5-sodium sulfoisophthalate. It consisted of the polyethylene terephthalate copolymer containing 1.8 mol%. In this way, a polyester sheath-core composite yarn of 50 denier / 24 filaments was obtained.

Dough made of this polyester ciscore-type composite yarn by circular knitting machine was dyed with a cationic dye using a liquid dyeing machine, and then processed paper was manufactured through a final setting process. The opacity of the dough and the dyeing fastness of the processed paper were evaluated and shown in Table 1.

In addition, after the polyester ciscore-type composite yarn was worked for 48 minutes with a regular Gyeonggi, the number of defects per 10 million m was converted into Table 1 and shown.                     

TABLE 1

* Assessment Methods

(1) Opaque property: First, a black standard plate is placed on the back side of undyed dough and the white light is irradiated to measure the reflectance. Subsequently, the white standard plate is irradiated instead of the black standard plate to measure its reflectance. The difference between the two reflectances is defined as opacity (L1). The lower the L1 value, the better the opacity.

(2) Chung Kyung-sung: It was evaluated as the number of defects per 10 million meters of yarn.

(3) Color fastness: According to water fastness KS K 0635, wash fastness KS K 0430, daylight fastness KS K 0700.

The polyester sheath-core composite yarn according to the present invention can be dyed with a cationic dye, has excellent fastness, has excellent opacity by a ceramic component, and improves spinning workability because the ceramic component does not protrude to the yarn surface. In post-processing processes such as dressing and weaving, guide wear is significantly reduced, resulting in a good finish.

Claims (3)

The core portion contains 1.0 to 5.0 wt% of titanium dioxide ceramic component, and 1.0 mol of any one of 5-sodium sulfoisophthalate, 5-lithium sulfoisophthalate, and 5-potassium sulfoisophthalate is 1.0 mol in the polymer chain. Polyethylene terephthalate copolymer containing% to 3.0 mol% is used, and the sheath portion contains 0.02 to 0.5 wt% of titanium dioxide ceramic component, 5-sodium sulfoisophthalate, 5-lithium sulfoisophthalate, 5- A polyethylene terephthalate copolymer containing either 1.0 mol% to 3.0 mol% of potassium sulfoisophthalate in the polymer chain is used, and the ratio of the fiber cross-sectional area of the core portion and the sheath portion is from 40 area% to 60 area%. A method for producing a polyester sheath-core composite fiber, characterized in that it is produced so that 90 area% vs. 10 area%. A polyester sheath core composite fiber produced by the method of claim 1. Woven and knitted fabric comprising the polyester sheath core type composite fiber according to claim 2.