KR100808567B1 - High-volume yarns and their textiles using alkali-soluble polyester resins and methods for producing the same - Google Patents

Abstract

High-volume yarns and their textiles using alkali-soluble polyester resins and a manufacturing method thereof are provided to offer the produced fiber with excellent physical property. Different kinds of polyester resins such as a dilute alkalic soluble polyester resin of 10-80 wt% and polyester resin of 20-90 wt% with no dilute alkali solubility are extruded and blended at the different holes within the same spinneret so that the dilute alkalic soluble polyester original yarn is obtained. The dilute alkalic soluble polyester resin is a resin compound comprising polyester resin of 85-95 wt% and water soluble polyalkylene oxide resin of 5-15 wt%. The blended polyester fiber is twisted within the twisted number of 500-3000 TM. The polyester resin comprises terephthalic acid or their derivative as the first unit member, a glycol compound as the second unit member, 5-sulfoisophthalate salt of 1-10 mol % or their ester derivative. Further, the glycol compound is an ethylene glycol.

Description

Volumetric yarn using a soluble polyester resin and a method for manufacturing the textile product thereof {HIGH-VOLUME YARNS AND THEIR TEXTILES USING ALKALI-SOLUBLE POLYESTER RESINS AND METHODS FOR PRODUCING THE SAME}

1 (a) and 1 (b) show before dissolving polyvinyl alcohol (polyvinylalcohol, PVA) composite fiber, which has been commonly used as a usable or water-soluble fiber in the prior art, as an elution solvent (1 (a)). ) Is a photograph comparing the fiber structure of (1 (b)).

Figure 2 (a) and Figure 2 (b) is a photograph showing the state before (a) and (b) before eluting the usable polyethylene terephthalate (polyethylene terephthalate) fibers with an alkaline solution, respectively.

The present invention provides a mixed fiber by simultaneously spinning a weak alkaline soluble polyester fiber and a general polyester polymer which is not easily dissolved even in a weak alkaline solution in which the weak alkaline soluble polyester fiber is eluted. In addition, the present invention relates to a method of manufacturing a woven / knit fabric having a volume and elasticity as a space is formed between polyesters after elution of the usable component in a fabric using the same.

Conventionally, the use of mainly water-soluble polyvinyl alcohol (hereinafter referred to as PVA) fibers as shown in Figs. 1 (a) and 1 (b) in these applications accounts for most of the time, but PVA fibers have high strength at high temperature and high humidity. And weaknesses such as basic mechanical properties such as elongation was weak. This is because the intermolecular binding force, which determines the strength of the fiber in the PVA fiber, is weakened. The intermolecular binding force is weakened due to the intermolecular or intramolecular hydrogen bond cleavage of the water-soluble PVA fiber by moisture and heat. In addition, PVA fibers are easily swelled by moisture, so that the shape stability of the fabric, such as poor morphological stability had to be maintained at the appropriate temperature and humidity in the process of manufacturing the product. In order to overcome the shortcomings of the PVA fibers described above, studies on usable synthetic resins have been conducted. In particular, researches using polyester resins have been actively conducted, but in these studies, the manufacturing process of melt spinning and stretching for fiberization as well as the manufacturing process of most resins were performed. There was this extremely bad problem.

Therefore, the present invention solves the problems of the prior art and is easily dissolved and hydrolyzed under weak alkaline conditions, and the process mixture is excellent in manufacturing process by spinning and mixing the weak alkali-soluble polyester polymer and the general polyester polymer simultaneously. An object of the present invention is to provide a composite polyester fiber excellent in the physical properties of the fiber, a manufacturing method thereof, and a woven / knit fabric using these materials.

The present invention is to prepare a weak alkali-soluble polyester and melt spinning it to produce a polyester fiber, characterized in that the melt-eluted polyester is produced after melting and spinning the usable polyester fiber and the conventional polyester fiber at the same time do. Specifically, in one embodiment of the present invention, a polyester resin is prepared using terephthalic acid or a derivative thereof and a glycol compound monomer, and when polymerizing these units, 1 to 1 based on terephthalic acid or a derivative molecule thereof. 85 to 95% by weight and number of polyester-based and / or polyester-ester-based resins characterized by adding and polymerizing a salt of 5-sulfoisophthalic acid or an ester derivative thereof in a 10 mol-% amount. A resin composition containing 5 to 15% by weight of a water-soluble poly (alkylene oxide) having an average molecular weight (range of number-averaged molecular weight) of 1,000 to 20,000 is prepared. A) weakly alkaline soluble resin and b) conventional polyester resin which is not eluted even under weakly alkaline conditions are melt-spun at the same time through a single spinneret to produce a mixed fiber polyester yarn. In the present invention, when the composite polyester yarn is manufactured through melt spinning, the composite fiber is twisted with a suitable twist to prepare a knitted fabric, and the volume is prepared by the empty space generated by eluting the weak alkali-soluble polyester in post-processing. The present invention relates to a method for producing a woven / knitted fabric, which exhibits lightness and elasticity.

The weak alkali availability refers to the property of dissolving the fiber component in the dilute alkaline solution to the extent that normal polyester resins are not affected and decomposing the filaments. In the present invention, weak alkali solubility is a property which can dissolve as much of the usable filament as desired by eluting with a weak alkali solution. When the weak alkali-soluble polyester resin is eluted at 90 ° C. for 1 hour in a dilute solution having an alkali concentration of about 1%, 30% or more of the fibers are usually eluted. However, the weak alkali dissolution treatment in the present invention is not limited to the above exemplary conditions, and those skilled in the art can appropriately adjust the alkali concentration range, the type of alkali substance, the elution temperature and time, and the ratio (elution ratio) of the elution solution and fibers. The usable polyester resin component can be decomposed to a desired degree.

In the present invention, a terephthalic acid or a derivative thereof is first reacted with one unit, and a glycol compound is reacted with another unit to prepare a polyester resin. Terephthalic acid or a derivative thereof in the present invention is a general name of aromatic dicarboxylic acid including terephthalic acid ( para - benzene dicarboxylic acid) and phthalic acids which are isomers of terephthalic acid and ester compounds or salts thereof, isophthalic acid, orthophthalic acid, And 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, bis (para-carboxyphenyl) methane and the like.

Examples of the glycol compound which is another unit of the present invention include ethylene glycol, propylene glycol, 2,3-butanediol, 1,4-butanediol, and the like.

In one embodiment of the present invention, polyethylene terephthalate (hereinafter referred to as PET) resin is prepared by selecting terephthalic acid as the terephthalic acid or a derivative thereof and ethylene glycol as the glycol compound.

In the present invention, a salt of 5-sulfoisophthalic acid or a salt thereof in a polymerization reaction of the ethylene glycol compound and terephthalic acid or a derivative thereof in order to improve the mechanical weatherability, physical properties, and hydrolysis properties of the resulting polyester resin. Ester derivatives can be added to polymerize. Examples of the salt of 5-sulfoisophthalic acid or its ester derivative in the present invention include sodium salt of 5-sulfoisophthalic acid and dimethyl ester of alkali metal salt of 5-sulfoisophthalic acid. The salt of 5-sulfoisophthalic acid or its ester derivative is added in an amount of 1 to 10 mol% based on terephthalic acid or its derivative in the unit. When the amount of 5-sulfoisophthalic acid salt or ester derivative thereof is less than 1 mol%, the weak alkali availability is reduced. When it exceeds 10 mol%, aggregates in the polyester polymer are generated, which blocks the polymerization filter or the pressure of the spin pack. This rises sharply. In addition, the crystallization rate of the fiber is faster, the cutting rate is increased in the spinning process, the productivity is greatly reduced by frequent replacement of the polymerization filter or spinning pack. Soluble poly (alkylene oxide) resins 5 to 85-95% by weight of the polyester-based and / or polyester-ester resins obtained by copolymerizing a salt of 5-sulfoisophthalic acid or an ester derivative thereof with a number average molecular weight of 1,000 to 20,000 Mix with 15% by weight to complete the weak alkali-soluble polyester resin composition. Non-limiting examples of water soluble poly (alkylene oxides) that can be used in the present invention include poly (ethylene oxide). In the present invention, the solubility of the polyester polymer is remarkably poor when the amount of the polyester resin is more than 95% so that the content of poly (alkylene oxide) is less than 5% by weight. In addition, when the amount of the polyester resin is less than 85% by weight, the content of the poly (alkylene oxide) resin is more than 15% by weight, and the spinning operation is drastically reduced due to deterioration due to thermal decomposition in post-processing.

According to an aspect of the present invention, there is provided a polyethylene terephthalic acid (PET) resin polymerized using ethylene glycol as the glycol compound and terephthalic acid as a unit thereof as terephthalic acid or a derivative thereof, wherein 5 is a salt of 5-sulfoisophthalic acid. The sodium salt of sulfoisophthalic acid is added during the polymerization of the units to synthesize a PET resin, and a resin composition containing the PET resin and the poly (ethylene oxide) resin is prepared to complete the weak alkali-soluble PET. The weak alkali-soluble PET is blended with a conventional PET resin at an appropriate ratio, and is melt-spun at the same time through the same spinneret, but is extruded through different holes. In the extrusion process, the stretching process may be performed in parallel, or after the extrusion is completed, a separate stretching process may be performed.

Meanwhile, in the present invention, the pair of resins of the weakly alkaline soluble resin and the conventional polyester resin are simultaneously spun through different holes of the same spinneret, and the fibers are stretched and then twisted and given by twisting to obtain yarns. Provided are a method for producing a woven / knitted product in which the weakly soluble resin filament is removed by eluting the woven and braided fibers including the method and the yarn with an aqueous weak alkali solution.

A particularly important process when preparing molten polymers into fibers is a usable spinning process. Spinning processes affect productivity and processing and, as a result, have a significant impact on the quality of the final product. When the thermoplastic resin is extruded through a fine diameter spinneret and fiberized, the resin receives a shear stress in the spinneret, causing shear stress. As the shear stress received in the spinneret disappears immediately after passing through the spinneret, the fiber diameter is increased. Increase (the so-called virus effect). Since the increase in the diameter of the fiber occurs until recently, the technique has been used to select a spinneret having a diameter suitable for the flow characteristics of the polymerization reaction. If the diameter of the cap is small, the shear stress and shear strain in the spin cap will increase, resulting in an increase in the virus effect. As a result, the uniformity of the monofilaments constituting the fiber will be poor. Larger than the properties, the shear stress and shear strain in the spinneret is lowered to entangle the polymer chain more and the spin draft is lowered, so the uniformity is poor. This not only deteriorates the fibrous manufacturing processability, but also adversely affects the use of the fibers thus produced in the subsequent process, resulting in poor quality of the final product, the knitted fabric.

In order to solve this problem, the present invention takes a method in which a resin pair consisting of a weak alkali-soluble polyester polymer resin and a conventional polyester polymer resin is spun and mixed with each other in a hole. In the present invention, it is possible to easily mix the filaments of the heterogeneous polymer can be produced a yarn material excellent in productivity and physical properties.

The polyester blended yarn prepared through the blended yarn can give proper twist through the twisted yarn, and the yarn is completed through the twisting process. In addition, blended yarns can be used for weaving and braiding as they are, to produce woven and knitted fabrics. When the prepared knitted fabric product is eluted in a weak alkaline solution as shown in Figs. 2 (a) and 2 (b), the weakly insoluble general polyester resin supports the structure, so that the weak alkali-soluble poly in the knitted fabric product The part of the ester filament is eluted to maintain the form of the woven or knitted fabric even if a void occurs in its place. In addition, eluted woven and knitted textile products have a light weight, excellent volume and excellent properties of elasticity due to the presence of voids.

In the present invention, the twisting step of the twisting step is appropriately 500 ~ 3,000 TM, if less than the above range, it is difficult to maintain the strength and appearance of the fiber after elution of the weak alkali-soluble filament, if it exceeds the above range The drawback of the process is extremely low process workability.

In the present invention, when the weak alkali-soluble polyester resin and the general polyester resin are mixed to obtain a resin pair, the mixing ratio is preferably 10 to 80% by weight of the weak alkali-soluble polyester resin in the resin pair. If the ratio of the weak alkali-soluble polyester is less than 10%, the elasticity is low because there is not much empty space after alkali elution, and if it is more than 80%, the structural strength of the fiber is not suitable for use as the filament is excessively eluted and disappeared. Weakened to a level. According to the polyester fiber manufacturing method of the present invention, when the fiber material is mixed by mixing the weak alkali-soluble polyester resin and the general polyester resin, the denier is 20 to 200 and the number of filaments is 6 to 96. Do.

Example

Hereinafter, the present invention will be described in more detail with reference to Examples. This embodiment is for the purpose of illustrating the construction of the invention to the last, and is not intended to limit the scope of the invention in any sense.

(Comparative Example 1)

In preparing a polyester by polymerizing a terephthalic acid or a derivative thereof and an ethylene glycol compound and melt spinning the same, it contains 5 mol% of sodium salt of 5-sulfoisophthalic acid based on terephthalic acid or a derivative thereof. A weak alkali-soluble PET resin composition was prepared containing 90% by weight of polyester-based and / or polyester-ester-based resins and 10% by weight of a water-soluble poly (ethylene oxide) resin having a number average molecular weight of 9,000. 50 / 24F of the weak alkali-soluble PET resin alone is spun at a spinning temperature of 285 ° C. and a speed of 20000 m / min through one spinneret, and the elongation at break of the final stretched yarn is 10 to 50% through the stretching process. Fiber was prepared. This weak alkaline soluble PET fiber and normal PET are mixed by using an injector at a weight ratio of 50:50, followed by twisting with 100 TM twist, followed by elution in a weak alkaline aqueous solution during weaving and finishing (NaOH 1%, 2 hours, 90 (DegreeC) and bath ratio 1:10).

(Comparative Example 2)

A resin composition of weak alkali-soluble PET resin and polyethylene oxide was prepared in the same manner as in Comparative Example 1, but only the resin composition was spun at a spinning temperature of 285 ° C. and a speed of 4,000 m / min. 50 / 24F fibers were prepared. This is mixed with general PET with an injector at a 50:50 ratio, and twisted with 500 TM twist, followed by elution treatment in weakly alkaline aqueous solution during weaving and finishing (NaOH 1%, 2 hours, 90 ° C, bath ratio 1:10). It was.

(Example 1)

A resin composition of a weak alkali-soluble PET resin and polyethylene oxide was prepared in the same manner as in Comparative Example 1, except that the weak alkali-soluble PET resin and the general PET resin were prepared in the same mold, respectively, at a radiation temperature of 285 ° C. and a firing rate of 2,000. Simultaneous spinning at m / min produced yarns with a blend ratio of 50:50 by weight. After the drawing process for this yarn, 100 / 48F of fiber having an elongation at break of 10 to 50% was produced. After twisting the yarn with 1,000 TM twist, it was eluted in a weak alkaline aqueous solution (NaOH 1%, 2 hours, 90 ° C, bath ratio 1:10) in weaving and post-processing.

(Example 2)

Manufactured in the same manner as in Example 2, but spinning the spinning speed at 4,000 m / min using the spinneret to produce a yarn to form a blend, then the elongation at break of the final stretched yarn 100 to 100% through the stretching process A fiber of / 48F was prepared. After twisting with 1,500 TM twisting, we performed eluting in weak alkaline aqueous solution (NaOH 1%, 2 hours, 90 ℃, bath ratio 1:10) in weaving and post processing.

The cut ratio and the state of the fiber appearing in each process are shown in Table 1 below.

division Single spinning Compound spinning CS (twist) Emissivity The state of the fiber after dissolution processing Comparative Example 1 ○ 100 50% × Comparative Example 2 ○ 500 50% △ ~ × Example 1 ○ 1,000 2% ○ Example 2 ○ 1,500 2% ○

 [Identification standard of the condition ○: Good (excellent) △: Medium (volume but weak) ×: Poor (no volume)]

From Table 1, it can be seen that the fibers of the embodiment according to the present invention are significantly improved in the spinning cut ratio compared to the fibers of the comparative example, and the condition of the fiber fabric after elution processing is good.

When the weak alkali-soluble polyester resin of the present invention is used, a fiber having excellent volume and elasticity and even a knitted fabric using the same can be obtained by a simple manufacturing process of spinning together through the same spinneret as the general polyester resin, and alkali dissolution treatment. have. In addition, the spinning cut ratio is improved during spinning, and the appearance of the textile fabric after elution is very good.

Claims (11)

10 to 80% by weight of weak alkali-soluble polyester resin and It consists of 20 to 90% by weight of polyester resin without weak alkali usability It is characterized in that the heteropolyester resin is obtained by intermixing by simultaneously extruding into different holes in the same spinneret, respectively, Weak alkaline soluble polyester yarn. The method of claim 1, The weak alkali-soluble polyester resin Terephthalic acid or a derivative thereof as a first unit and a glycol compound as a second unit, containing 1 to 10 mol% of a salt of 5-sulfoisophthalate or an ester derivative thereof of terephthalic acid or a derivative thereof 85 to 95% by weight of polyester resin to be polymerized and It is a resin composition which consists of 5-15 weight% of water-soluble poly (alkylene oxide) [poly (alkylene oxide)] resins, Weak alkaline soluble polyester yarn. The method of claim 2, The terephthalic acid or a derivative thereof is terephthalic acid, The glycol compound is ethylene glycol, The salt of 5-sulfoisophthalic acid or a derivative thereof is 5-sulfoisophthalic acid sodium salt, The poly (alkylene oxide) is poly (ethylene oxide), The weak alkali-free polyester resin is characterized in that the polyethylene terephthalate (polyethylene terephthalate) resin, Weak alkaline soluble polyester yarn. The method of claim 1, The blended polyester fibers are twisted so that the twisted yarn twisted within 500 ~ 3,000 TM, weakly alkaline usable polyester yarn. A fiber comprising any one or more of the polyester yarns of claim 1 to 4, woven and braided, and then eluted in a weak alkali solution, Polyester-containing fiber products. Step (a) of simultaneously extruding 10 to 80% by weight of weak alkali-soluble polyester resin and 20 to 90% by weight of weak alkali-soluble polyester resin by simultaneously extruding them into different holes of the same spinneret. A method for producing a weak alkali-soluble polyester yarn, comprising: The method of claim 6, B) stretching the blended yarn in step a); And C) further comprising the step of twisting the stretched yarn of the step b) with a twist number 500 ~ 3,000 TM, Method for producing weak alkali-soluble polyester yarn. The method of claim 6, Step a) is characterized in that the mixing and the stretching process is made at the same time during the extrusion process, B) further comprising the step of twisting the stretched and mixed fibers in the number a) to 500 ~ 3,000 TM twist, Method for producing weak alkali-soluble polyester yarn. The method of claim 6, The weak alkali-soluble polyester resin A polyester resin polymerized by using terephthalic acid or a derivative thereof as a first unit and a glycol compound second unit, and containing 1 to 10 mol% of a salt of 5-sulfoisophthalic acid or an ester derivative thereof of terephthalic acid or a derivative thereof. 95 wt% and It is a resin composition which consists of 5-15 weight% of water-soluble poly (alkylene oxide) resin, Method for producing weak alkali-soluble polyester yarn. The method of claim 9, The terephthalic acid or a derivative thereof is terephthalic acid, The glycol compound is ethylene glycol, The salt of 5-sulfoisophthalic acid or a derivative thereof is 5-sulfoisophthalic acid sodium salt, The poly (alkylene oxide) is poly (ethylene glycol), The weak alkali usability polyester resin is characterized in that the polyethylene terephthalic acid resin, Method for producing weak alkali-soluble polyester yarn. In the manufacturing method of the knitted fabric which contains polyester, A) weaving and braiding a fiber comprising at least one polyester yarn prepared by the method of any one of claims 6 to 10, and B) eluting the polyester fiber that has been finished weaving and braiding in a) in a weakly alkaline solution; The manufacturing method of polyester containing woven fabric.

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