KR101427795B1 - Biodegradable Polyester Yarns with Natural Fiber-like Characteristics and Process of preparing same - Google Patents

Abstract

A biodegradable polyester yarn expressing a natural fiber-like texture and characteristics of the present invention is prepared by the steps: (i) preparing a copolyester resin by condensation-polymerizing a polymerization reactor including (a) a component selected from a group consisting of an aromatic dicarboxylic acid or anhydride thereof, or a petroleum-based or biomass-derived aliphatic dicarboxylic acid, or a petroleum based or biomass-derived hydroxybenzoic acid, and a mixture thereof, and (b) aliphatic glycolselected from a group consisting of petroleum-based or biomass-derived ethylene glycol, petroleuml-based or biomass-derived 1,2-propanediol, petroleum-based biomass-derived neopentyl glycol, and petroleum-based or biomass-derived isosorvibro in order to maintain biodegradable and thermal stability; (ii) preparing first yarn having a fiber thickness of 1.0 De′ to 5.0 De′ and having remaining ductility of 25 to 50%, and second yarn having a fiber thickness of 1.0 De′ to 5.0 De′ and having remaining ductility of 25 to 50% by using the copolyester resin; (iii) supplying the first and second yarns to two feed rollers arranged in series at the same time, and endowing air-jet interlacing spun in a state that an overfeed rate becomes a range between 1.3 to 2.8%; and (iv) performing a texturing with respect to a thread collected through the air-jet interlacing spun.

Description

TECHNICAL FIELD [0001] The present invention relates to a biodegradable polyester fiber which exhibits natural fiber texture and characteristics,

The present invention relates to a biodegradable polyester fiber. More specifically, the present invention relates to a biodegradable polyester fiber which exhibits properties such as natural fibers in terms of texture, appearance, dye uniformity and the like.

BACKGROUND ART [0002] In the field of synthetic fiber production, various technologies have been developed and used to manifest a natural appearance, such as natural fibers, and a bulky and smooth texture. Especially, the technique of making a staple fiber such as a cotton or a wool and making it into a spun yarn is commercialized and widely used.

However, synthetic fiber spun yarns still tend to be recognized as low-grade yarns due to slippery texture as compared with cotton and have a disadvantage that they can not completely solve the pilling problem that occurs when wearing clothes. On the other hand, in the state of synthetic filament filament, since it has a smoother surface texture compared to a synthetic fiber spun yarn and a uniform appearance, it exhibits cold and shiny characteristics unlike cotton or wool. It can be said that the distance is far.

In order to solve this problem, Korean Patent No. 1992-0010288 discloses a technique of using two types of filament yarns having different degrees of orientation to perform composite filament yarns under specific temperature and focusing conditions. This technique can exhibit irregular loops and pore structure somewhat similar to natural fibers, but by setting the flammability temperature high to improve the woven fabric, this void structure is reduced and the filament yarn of the desire side is too low It is easily fused at the flammable temperature, so that the sensibility such as soft cotton or wool is not sufficient. Also, it is characterized in that an overfeed is applied before and after the formation of the entanglement, but the composite tantrum processability and the dye uniformity are remarkably different depending on the actual overfeed degree. However, in the above patent, there is a problem in that it is difficult to commercialize the technology by applying a proper over-feed period.

Korean Patent No. 10-1062831 discloses a polylactic acid fiber having biodegradable properties such as natural fibers. However, this patent does not describe a technique of expressing a specific natural fiber texture, but actually adopts the same technique as a composite flammability method due to the low melting point of the poly (lactic acid polymer) and the characteristic that it increases upon heat treatment. As a result, in this patent, it is difficult to express the natural fiber texture, and in particular, when the yarn is made into a woven fabric, there arises a problem of hardening or fusion in the heat treatment process.

The present inventors have developed the biodegradable polyester fiber of the present invention which overcomes the problems of the prior art as described above and develops properties such as natural fibers in terms of texture, appearance, dyeing uniformity and the like.

An object of the present invention is to provide a polyester fiber having biodegradability while exhibiting properties such as natural fibers in terms of texture, appearance, dyeing uniformity and the like.

These and other objects of the present invention can be achieved by the present invention described in detail below.

The biodegradable polyester fiber, which exhibits the natural fiber texture and properties according to the present invention,

(i) an aromatic dicarboxylic acid or an acid anhydride thereof, an aliphatic dicarboxylic acid derived from petroleum or biomass, a petroleum-derived or biomass-derived hydroxybenzoic acid, and (B) ethylene glycol derived from petroleum or biomass, 1,2-propanediol derived from petroleum or biomass, neopentyl glycol derived from petroleum or biomass, and petroleum or biomass derived petroleum or biomass derived neopentyl glycol, And a mass-derived isosorbide, to produce a copolyester resin,

(ii) a first yarn having a monofilament fineness in the range of 1.0De 'to 5.0De' and a residual elongation in the range of 25 to 50% using the resin, and a single yarn fineness ranging from 0.1De 'to 2.0De' Of the first yarn is in the range of 80 to 150%, wherein the total islands ratio between the two yarns satisfies the following range,

1st yarn (low yarn yarn): second yarn (high yarn yarn) = 20: 80 ~ 40: 60

(iii) feeding the first and second yarns to two feed rollers arranged in series at the same time, and causing the over feed ratio between the two feed rollers to be in the range of 1.3% to 2.8% , And

(iv) The yarn gathered by the air entanglement is subjected to simultaneous twist-off under the following conditions:

(1) 140 ° C ≤ primary flammable temperature ≤ 180 ° C

(2) 1.010? Stretching ratio? 1.300

(3) 0.2? K value? 0.8

Wherein the primary melting temperature is the temperature of the contact heater and the stretching ratio is a ratio of the speed difference between the two feed rollers, specifically, the stretching ratio in the Texturing Zone where tear and smell occur, and the K value Is the ratio of untwist tension to twist tension (usually expressed in grams)

≪ / RTI >

The interlocking device used in the step (iii) is an interlacer composed of an air flow orifice and a sado flow orifice running on the sash, and preferably has an air flow orifice diameter of 1.3 mm or more and 3.0 mm or less. If the diameter of the air flow orifice is smaller than 1.3 mm, a sufficient focusing effect can not be expected. On the other hand, when the diameter is larger than 3.0 mm, the length of the interlocking portion becomes longer and the thread can be damaged.

The fiber produced by the above technique has excellent biodegradability and fine loop and pore structure on the surface, thereby exhibiting natural appearance and texture such as natural cotton or wool, and having excellent dyeing uniformity.

Hereinafter, the details of the present invention will be described in detail.

INDUSTRIAL APPLICABILITY The present invention has the effect of providing a polyester fiber having biodegradability while exhibiting properties such as natural fibers in terms of texture, appearance, dyeing uniformity and the like.

The present invention relates to biodegradable polyester fibers, and relates to biodegradable polyester fibers that exhibit properties similar to natural fibers in terms of texture, appearance, dye uniformity, and the like.

In order to produce the biodegradable polyester fiber which exhibits the natural fiber texture and properties according to the present invention, a copolyester resin is used as a raw material. Copolyester resins are used to maintain excellent biodegradability and thermal stability. The copolyester resin is obtained from a group consisting of (a) an aromatic dicarboxylic acid or an acid anhydride thereof, a petroleum or biomass derived aliphatic dicarboxylic acid, a petroleum or biomass derived hydroxybenzoic acid, and a mixture of two or more thereof (B) ethylene glycol derived from petroleum or biomass, 1,2-propanediol derived from petroleum or biomass, neopentyl glycol derived from petroleum or biomass, and isosorbide derived from petroleum or biomass And at least one aliphatic glycol selected from the group consisting of ethylene and propylene.

Using the copolyester resin prepared above, the first yarn having a single yarn fineness in the range of 1.0De 'to 5.0De' and the residual elongation in the range of 25 to 50% and the single yarn fineness in the range of 0.1De 'to 2.0De' , And a second yarn having a residual elongation in the range of 80 to 150%, that is, two kinds of yarns. At this time, it is preferable that the ratio of the first yarn (low yarn yarn): the second yarn (high yarn yarn) ranges from 20:80 to 40:60.

The above-prepared first and second yarns are supplied to two feed rollers arranged in series at the same time, and air entanglement is imparted while the over feed ratio between the two feed rollers is in the range of 1.3% to 2.8% . The interlocking device used here is preferably an interlacer made of an air flow orifice and has a diameter of 1.3 mm or more and 3.0 mm or less. If the diameter of the air flow orifice is smaller than 1.3 mm, a sufficient focusing effect can not be expected. On the other hand, when the diameter is larger than 3.0 mm, the length of the interlocking portion becomes longer and the thread can be damaged.

The yarn gathered by the air entanglement is simultaneously twisted to satisfy the following conditions.

(1) 140 ° C ≤ primary flammable temperature ≤ 180 ° C

(2) 1.010? Stretching ratio? 1.300

(3) 0.2? K value? 0.8

In the above formula, the primary firing temperature is the temperature of the contact heater, and the stretching ratio is a ratio of the speed difference between the two feed rollers, specifically, the stretching ratio in the Texturing Zone where the fusing and the seam occurs, Untwist is the ratio of tension / twist tension, where tension is usually expressed in grams.

The fiber produced by the above technique has excellent biodegradability and fine loop and pore structure on the surface, thereby exhibiting natural appearance and texture such as natural cotton or wool, and having excellent dyeing uniformity.

Hereinafter, embodiments of the present invention will be described in detail. However, the embodiment according to the present invention can be modified into various other forms, and the scope of the present invention is not construed as being limited to the embodiments described below. The embodiments of the present invention are provided to enable those skilled in the art to more fully understand the present invention.

Example

Example 1

The first yarn is melt-spun to have a single yarn fineness of 3.0 denier and an elongation of 35% using a copolyester polymer having excellent biodegradability, and the second yarn is melt-spun so that the single yarn fineness is 0.5 denier and the elongation is 120%. At this time, the total fineness ratio between the first and second yarns was set to be 30:70. The first and second yarns were then simultaneously focused using an entanglement apparatus in which the nip twist belt twisted yarn air had an overfeed rate of 2.0% between two feed rollers and an air flow orientation of 1.3 mm. Then, the 1ST heater temperature was set to 150 DEG C and the stretching ratio was set to 1.04. Table 1 shows the biodegradability, final sensibility evaluation and dyeing uniformity results.

Example 2

The same polymer as in Example 1 was melt-spun so that the single yarn fineness of the first yarn was 2.5 denier and the total fineness ratio of the first yarn: second yarn was 35: 65. The two yarns were then simultaneously focused using an interlocking device in which the nip twist belt twisted yarn twisted air feeder had an overfeed rate of 2.0% between the two feed rollers and an air flow orientation of 1.3 mm. Then, the temperature of the 1ST heater was set at 160 DEG C and the stretching ratio was set at 1.03. Table 1 shows the biodegradability, final sensibility evaluation and dyeing uniformity results.

Example 3

The same polymer as in Example 1 was melt-spun, and the fineness and elongation of the first yarn were the same as in Example 2, and the second yarn had a single yarn fineness of 0.7 denier. The total fineness ratio of the first and second yarns is 40:60. The two yarns were then simultaneously focused using an interlocking device in which the nip twist belt twisted yarn air was at an air feed rate of 2.4% between two feed rollers and an air flow orientation of 1.6 mm. Then, the 1ST heater temperature was set to 165 DEG C and the stretching ratio was set to 1.03. Table 1 shows the biodegradability, final sensibility evaluation and dyeing uniformity results.

Comparative Example 1

The finenesses and elongations of the first and second yarns and the total fineness ratios of the two yarns were prepared in the same manner as in Example 1 by melt spinning the poly (lactic acid) polymer. The two yarns were then simultaneously focused using a tweeter with a nip twist belt twisted yarn air feeder roller at an over feed rate of 2.0% and an air flow orientation yarn of 1.3 mm. Then, the temperature of the 1ST heater was set to 130 DEG C and the stretching ratio was set to 1.20. Table 1 shows the biodegradability, final sensibility evaluation and dyeing uniformity results.

 Comparative Example 2

The same polymer as in Example 1 was melted and spun to spin-melt the first yarn so as to have a single yarn fineness of 3.0 denier and an elongation of 35%, and melt spinning the second yarn so that the single yarn fineness was 0.5 denier and elongation was 120%. At this time, the total fineness ratio of the two yarns was set to 70:30 ratio. The two yarns were then simultaneously focused using a tweeter with a Nip Twist Belt twisted yarn in which the overfeed rate between the air and the feed rollers was 1.0% and the Air Flow Orifice was 1.3 mm. Then, the 1ST heater temperature was set to 150 DEG C and the stretching ratio was set to 1.04. Table 1 shows the biodegradability, final sensibility evaluation and dyeing uniformity results.

Comparative Example 3

The same polymer as in Example 1 was melted and spun to spin-melt the first yarn so as to have a single yarn fineness of 3.0 denier and an elongation of 35%, and melt spinning the second yarn so that the single yarn fineness was 0.5 denier and elongation was 120%. At this time, the total fineness ratio of the two yarns was set to be 30:70. Thereafter, the two yarns were simultaneously focused using a twisting device in which the twist twist type yarn was 2.0% of the air feed rate between the feed rollers and the air flow orientation was 2.0 mm. Then, the 1ST heater temperature was set at 195 DEG C and the stretching ratio was set at 1.055. Table 1 shows the biodegradability, final sensibility evaluation and dyeing uniformity results.

How to measure

- Softness (Bulkiness): 10 apparel apparel experts were compared with the test samples (Examples and Comparative Samples) using a general cotton yarn 60S 'sample as a control, and sensory evaluation was carried out. When the softness of the control was 10 points or more, the softness was indicated as ⊚ when the score was 8 or more, ◯ when the score was 7 to 8 or less, △ when the score was 5 or less and 7 or less.

- Dyeing uniformity: 100 knots were manufactured, and 100 knots were stained with disperse dyes at 100 ℃ at room temperature. The uniformity and defective harvest in 100 knots were determined and expressed as percentages: Dyeing uniformity = normal staining Addition / Total dyeing weight * 100

- Biodegradability: According to KS M ISO 14855-1: 2010 measurement method, biodegradability was measured and it was judged that biodegradability was better when average biodegradability was more than 60% under 45 days test condition.

As a result of the evaluation of the fibers prepared in Examples 1 to 3, excellent biodegradability and good softness and bulkiness are shown in the above table. On the other hand, when poly (lactic acid) was used as in Comparative Example 1, softens and bulkiness were remarkably decreased due to low melting point and fusion occurred during the false twisting process. In Comparative Example 2, by increasing the ratio of the first yarn having a low elongation to 70% and lowering the overfeed rate to 1.0% in the ratio of the total yarn fineness of the two yarns, the first yarn having a low elongation is projected after the false twisting process to reduce the softness The difference in physical properties between the two yarns resulted in segregation after dyeing. As a result, the dye uniformity was lowered to 83%.

In Comparative Example 3, when the misfire temperature was increased to 195 ° C and the Air Flow Orifice of the focusing device was 2.0 mm, the surface loops could be advantageously fused to the woven fabric, but the softness and bulkiness were reduced due to fusion, I can not. Also, since the air flow rate of the air flow orifice of the focusing device is too large, a large amount of air flow is supplied to the yarn, resulting in an increase in frictional resistance and an increase in the number of yarn and yarn.

As shown in Table 1, by implementing the present invention, it is possible to produce fibers having excellent appearance and smooth texture, such as cotton or wool, having excellent biodegradability like natural fibers.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that the invention is included in the scope of the invention.

Claims (5)

(i) (a) an aromatic dicarboxylic acid or an acid anhydride thereof, a petroleum or biomass derived aliphatic dicarboxylic acid, a petroleum or biomass derived hydroxybenzoic acid, and mixtures thereof (B) ethylene glycol derived from petroleum or biomass, 1,2-propanediol derived from petroleum or biomass, neopentyl glycol derived from petroleum or biomass, and isosorbide derived from petroleum or biomass Condensation polymerization of a polymerization reaction comprising an aliphatic glycol selected from the group consisting of:
(ii) a first yarn having a monofilament fineness in the range of 1.0De 'to 5.0De' and a residual elongation in the range of 25 to 50% using the resin, and a single yarn fineness ranging from 0.1De 'to 2.0De' A second yarn in the range of 80 to 150%;
(iii) feeding the first and second yarns to two feed rollers arranged in series at the same time and providing an overfeed rate between the two feed rollers in the range of 1.3% to 2.8% Imparting air entanglement in one state; And
(iv) the yarn gathered by said air entanglement is subjected to simultaneous false twisting;
The method of claim 1, wherein the biodegradable polyester fiber is a polyester fiber.
The method for producing biodegradable polyester fiber according to claim 1, wherein the total yarn ratio of the first yarn and the second yarn ranges from the following range:
First yarn: second yarn = 20: 80 to 40: 60
The method according to claim 1, wherein the air entanglement in step (iii) is performed in an entanglement apparatus with an air flow orifice having a diameter of 1.3 mm or more and 3.0 mm or less. Wherein the biodegradable polyester fiber is a biodegradable polyester fiber.
The method of claim 1, wherein the simultaneous twisting of step (iv) is carried out under the following conditions: 1. A method for producing a biodegradable polyester fiber,
(1) 140 ° C ≤ primary flammable temperature ≤ 180 ° C
(2) 1.010? Stretching ratio? 1.300
(3) 0.2? K value? 0.8
(Where the primary smoldering temperature is the temperature of the contact heater and the stretching ratio is the ratio of the speed difference between the two feed rollers, specifically the stretching ratio in the Texturing Zone , And the value of K is a beam of untwist tension / twist tension (tension is expressed in gram))
A biodegradable polyester fiber exhibiting natural fiber texture and properties, characterized in that it is produced by the process according to any one of claims 1 to 4.