KR100454497B1 - Manufacturing method of polyester fiber having excellent hygroscopicity and antistatic property by blending polyamide ingredient showing fibril structure by difference of miscibility - Google Patents

Abstract

PURPOSE: A manufacturing method of polyester fiber having excellent hygroscopicity and antistatic property without deterioration of physical properties is characterized by blending a polyamide ingredient showing fibril structure by difference of miscibility. CONSTITUTION: Polyester fiber having excellent hygroscopicity and antistatic property is obtained by the steps of: preparing denatured polyester type copolymerized or mixed polyethylene terephthalate or a third ingredient; including 1-15wt.% of polyalkylene oxide glycol and 0.1-1.0wt.% of a sulphonates anion surfactant(formula 1) into the denatured polyester type; blending 1-20wt.% of polyamide having miscibility being different from the polyester type in melt-spinning; and then post-finishing the blended polyester to show fibril structure. In the formula 1, R1 is C12-C18 of hydrocarbon; M is Na, K or Li.

Description

Manufacturing method of polyester fiber excellent in water absorption and antistatic property

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester fiber excellent in absorbency and antistatic properties prepared by blend melt spinning a polyamide component, which is a kind of incompatible polymer that expresses a fibril structure in an antistatic polyester.

Polyester fibers are widely used in clothing and industrial applications because of their excellent mechanical strength and physicochemical properties, while they are generally manufactured by melt spinning, which generally has a smooth, slippery and stiff feeling. . In addition, since the polyester itself is hydrophobic, problems in use due to the generation of static electricity and low water absorption are pointed out in comparison with cotton and hemp which are natural fibers.

Representative techniques for producing absorbent and antistatic polyester fibers known to date include methods of eluting and removing inorganic particles from polyester fibers containing inorganic particles such as SiO ₂ by using an aqueous alkali solution to form fine irregularities on the surface of the fiber; A polyester hollow fiber is prepared by blending or co-polymerizing a compound having an antistatic performance and a pore-forming compound with existing polyester, and dissolving and extracting the same as the former to express micropores communicating with the inside of the hollow in the fiber axis and the horizontal direction. There is a way to.

The former method using inorganic particles has a drawback that the absorption function is higher than that of the existing polyester fiber, but the hydrophilicity of the polymer itself is inferior.

On the other hand, the latter method of expressing micropores after modifying the polymer itself through blending and copolymerization does not have sufficient satisfactory absorbency due to the disadvantage of lowering the physical properties of the fiber due to the pore-forming compound. There is a problem.

Korean Patent Publication No. 86-1224 discloses that a polyester containing 0.3 to 1.2% by weight of SiO ₂ relative to dimethyl terephthalate (DMT) in the polyester polymerization step is subjected to alkali weight loss treatment in a textile state to elute inorganic particles, and then fine porous fibers. The method for preparing the present invention has been proposed, and Korean Patent Publication No. 86-397 introduces a method of eluting before and after weaving and weaving by adding a sulfate-based compound as a pore-forming compound to polyester hollow fiber. There was a problem in practical use.

Therefore, the present invention blends a polyamide component expressing a fibril structure due to a difference in polymer compatibility to polyester fibers having antistatic performance, and finally improves antistatic performance and antistatic performance without degrading the physical properties of the fiber. It aims at providing the manufacturing method of a polyester fiber.

The present invention comprises a polyalkylene oxide glycol and a sulfonate anion surfactant compound of the following general formula (1) in a modified polyester obtained by copolymerizing or mixing polyethylene terephthalate or a third component, and are incompatible with polyesters. The present invention relates to a method for producing a polyester fiber having excellent absorbency and antistatic property, in which polyamides such as nylon 6 and nylon 66 having a blend are melt-blended during melt spinning to express a fibril structure during post-processing.

R ₁ is a hydrocarbon having 12 to 18 carbon atoms, and M is Na or K or Li

In order to achieve the purpose of absorbent expression in the polyester containing polyalkylene oxide glycol and sulfonate anionic surfactant to exhibit antistatic properties as described above, nylon 6, nylon 66 and the like which have incompatibility with polyesters Polyamides are blended during melt spinning, spun into fibers, elongated and then in the form of woven or knitted fabrics.

Finally, the fabric or knitted fabric is made of polyester fiber having excellent antistatic performance and absorbing performance without deterioration of the physical properties of the fiber through the post processing process of reducing the alkali.

Fibrillated structure uniformly formed inside and outside the fibers by melt spinning with polyamide and other blends having incompatibility with the antistatic polyester of the present invention provides better hygroscopic performance than conventional inorganic particles or pore-generating compounds. Not only does it improve further, it also provides the unique feel and dryness of the rayon bath.

On the other hand, polyalkylene oxide glycol which is an antistatic component contained in polyester and the sulfonate anionic surfactant compound of the general formula (1) exhibit excellent antistatic performance in fibers.

In the present invention, polyalkylene oxide glycol serving as a compound for imparting antistatic performance to polyester is polyethylene glycol, poly (1,2-propylene oxide) glycol, poly (1,3-propylene oxide) glycol, polytetramethylene Oxide glycol, polyhexamethylene oxide glycol, a block or random copolymer of ethylene oxide and propylene oxide, and a block or random copolymer of ethylene oxide and tetrahydrofuran may be used. In the present invention, polyethylene glycol is mainly used.

The molecular weight of the polyalkylene oxide glycol is more preferably in the range of 1,000 to 100,000, particularly in the range of 4,000 to 40,000. When the number average molecular weight is less than 1,000, the pore formation and the antistatic performance of the obtained polyester become weak, and in the case of exceeding 40,000, The size of the resulting pores is not only too large but also undesirable in terms of compatibility.

The polyalkylene oxide glycol used in the present invention shows good heat resistance as it is, but especially when the hindered phenol compound is used in blend or copolymerization, heat resistance is improved. Herein, the hindered phenolic compound is a phenol derivative having a substituent having steric hindrance in the adjacent position of the phenolic hydroxyl group, for example, terakis [methylene-3- (3,5-di-tertbutyl-4-). Hydroxyphenyl) propionate] methane (trade name; Iganox 1010) and the like can be used.

In this case, the amount of the hindered phenol compound added is preferably 0.5% by weight to 3.0% by weight based on the polyalkylene oxide glycol component. If it is less than 0.5% by weight, it is difficult to obtain the desired heat resistance effect, and if it exceeds 3.0% by weight, spinning workability and yarn properties, in particular, yarn strength are lowered.

The polyalkylene oxide glycol may be blended at the end of spinning or polymerization, or may be copolymerized by adding a comonomer during polymerization. An example of blending is a method of blending polyalkylene oxide glycol and a conventional polyethylene terephthalate chip so that the component amount of polyalkylene oxide glycol in the blend is the final desired weight% and spinning is carried out as an example of copolymerization with terephthalic acid. The oligomer of the bis-beta-hydroxyethylene terephthalate structure obtained by esterification of ethylene glycol, and polyalkylene oxide glycol were put into a reactor, and 220 degreeC at 260 degreeC and atmospheric pressure in presence of polycondensation catalysts, such as zinc acetate and antimony trioxide, After transesterification under a reduced pressure, there is a method of reacting under reduced pressure.

The polyalkylene oxide glycol used in the present invention may be added at any stage in the method of blending or copolymerizing, but it is more preferable to add the polyalkylene oxide glycol before the final polycondensation reaction at the time of copolymerization.

The mixture is preferably such that the amount of polyalkylene oxide glycol added is in the range of 1 to 15% by weight based on the polyester component. When the amount of the polyalkylene oxide glycol added to the polyester component in the mixture exceeds 15% by weight, damages such as trimming and elongation, coloring, etc. occur during spinning, and when the amount is less than 1% by weight, the effect of exhibiting antistatic properties is insufficient. Do.

The compound of the general formula (1) is preferably melt-spun by homogeneous mixing with the polyester polymer during polymerization or spinning in order to increase the formation of amorphous portions of the fiber polymer chain and to improve the antistatic performance, and the dosage is 0.1 to 1.0 weight of the polymer. % Use. If it is less than 0.1% by weight, it is difficult to obtain an antistatic effect. If it exceeds 1.0% by weight, there is a disadvantage in that trimming and yellowing occur.

Polyamides, such as nylon 6 and nylon 66, which exhibit fibrillated structure by polyester and incompatibility after alkali reduction, which is a post-processing process, exhibit excellent water absorption and tactile feel, are preferably mixed by melt mixing with polyester polymer. It is characterized by using 1 to 20% by weight relative to the polymer. If it is less than 1% by weight, it is difficult to obtain the fibrils expression effect after reducing the alkali, and if it exceeds 20% by weight, it will cause trimming and deterioration of fiber properties due to incompatibility problems.

The polyester fiber obtained by the above method has the advantage of exhibiting excellent antistatic property and absorbency even when spun using ordinary nozzles, unlike polyester fibers having general antistatic properties and water absorbency are spun into hollow fibers. Is advantageous in

After the fiber produced by the present invention is sacrificed using a conventional spinning nozzle, it is made into the form of a woven fabric or knitted fabric, and the obtained woven fabric or knitted fabric is subjected to alkali reduction during the post processing process. As an aqueous alkali solution used for elution of fibrils, the concentration of NaOH or KOH is 0.5% to 15%, more preferably 1% to 10%, and the treatment temperature is 70 ° C to 130 ° C. In the following, the reduction ratio is 1% to 70%, more preferably 5% to 50%, and finally a polyester antistatic fiber having excellent water absorption is obtained.

Hereinafter, the present invention will be specifically described based on Examples and Comparative Examples.

Example 1

To the polyethylene terephthalate oligomer obtained by esterifying terephthalic acid and ethylene glycol, 4.0 wt% of polyethylene glycol (molecular weight 20,000) having antistatic performance and 0.4 wt% of sodium dodecylbenzenesulfonate are added. On the other hand, the polycondensation reaction was added 0.01% by weight of zinc acetate and subjected to transesterification at 250 ° C for 1 hour, then 0.014% by weight of antimony trioxide, a polymerization catalyst, was added and heated up to 285 ° C under reduced pressure to 0.1-0.2 mmHg. Proceed for hours. The intrinsic viscosity of the polymer obtained at this time was 0.72. The polyester chip thus obtained was dried at 125 ° C. for 8 hours in a hot air dryer, and then melt mixed with 4.0 wt% of nylon 6 (molecular weight 21,500, melting point 229 ° C.) for uniform mixing. Melt spinning used a conventional 75 denier / 36 filament nozzle, spinning at a spinning temperature of 280 ℃, winding speed 1000m / min to obtain an undrawn yarn. The knitted fabric was manufactured from the polyester fiber obtained by extending | stretching this undrawn yarn to draw ratio 3.7. This knitted fabric was reduced in 4% aqueous NaOH solution to measure absorbency and antistatic properties. The results are shown in Table 1 below.

Examples 2-3 and Comparative Examples 1-4

As shown in Table 1, except that the polyethylene glycol content, the sodium dodecylbenzene sulfonate content and the nylon 6 content of the polyethylene terephthalate oligomer were changed in the same manner as in Example 1. Absorption and antistatic properties measured after the weight loss process with 4% NaOH aqueous solution are shown in Table 1.

TABLE 1

* How to measure absorption height (mm / 10min)

2.5 Collect 5 or more 20 cm specimens and immerse 1 cm of the lower end of each specimen in the water of a container containing distilled water. Measure the height of the water raised by capillary action when 10 minutes have elapsed.

* How to measure antistatic

Antistatic measurement was measured after washing the sample 5 times, dried, and left for 24 hours at 25 ℃, 40% relative humidity and then measured the frictional electrification voltage.

The present invention enables the production of polyester fibers with improved water absorption performance and antistatic performance without deterioration of physical properties, as well as the fiber of the present invention has an advantageous advantage in terms of manufacturing cost because it uses a conventional spinning nozzle.

Claims (4)

The modified polyesters obtained by copolymerizing or mixing polyethylene terephthalate or the third component contain polyalkylene oxide glycol and sulfonate salts of the following general formula (1), and have a surfactant compound, and have incompatibility with polyesters. A method for producing a polyester fiber having excellent water absorption and antistatic property, characterized by blending polyamides during melt spinning to express a fibril structure during post-processing.

R ₁ is a hydrocarbon having 12 to 18 carbon atoms, and M is Na or K or Li The method for producing a polyester having excellent water absorption and antistatic property according to claim 1, wherein the polyalkylene oxide glycol is added in an amount of 1 to 15% by weight based on the polyester component. The method for producing a polyester fiber having excellent water absorption and antistatic property according to claim 1, wherein the sulfonate anionic surfactant is added in an amount of 0.1 to 1.0 wt% based on the polyester component. The method for producing a polyester fiber having excellent water absorption and antistatic property according to claim 1, wherein the polyamide is added in an amount of 1 to 20% by weight based on the polyester component.