KR102274288B1 - Alkali-soluble polyester fiber having enhanced weavability and manufacturing method thereof - Google Patents

Abstract

The alkali-soluble polyester fiber having excellent weaving properties and a method for manufacturing the same of the present invention can satisfy excellent shape stability while having an excellent ventilation effect, and has an effect of easy melt spinning even with a commercial single spinning facility.
In addition, the alkali-soluble polyester fiber of the present invention and its manufacturing method have excellent weaving properties and are easy to elute under alkali reduction/dissolution processing conditions, while improving weaving and knitting properties through improvement of physical properties such as fiber strength and elongation and uniformity. This can be improved.

Description

Alkali-soluble polyester fiber excellent in weaving and manufacturing method thereof. {ALKALI-SOLUBLE POLYESTER FIBER HAVING ENHANCED WEAVABILITY AND MANUFACTURING METHOD THEREOF}

The present invention relates to an alkali-soluble polyester fiber having excellent weaving property and a method for manufacturing the same, and more particularly, to an alkali-soluble polyester fiber having excellent weaving property having excellent shape stability while having excellent ventilation effect, and a method for manufacturing the same is about

Soluble/water-soluble fiber has been conventionally used as a material for embroidery yarn or as a material for composite spinning to express a new look or feel in general fabrics or knitted fabrics. Recently, as it is used as a single yarn, its uses are diversifying. In particular, as the demand for functional products for sports and casual clothing expands, the demand for fabrics with maximum ventilation in summer is increasing. In order to manufacture such a breathable fiber, an attempt was made to form voids by arbitrarily leaving the yarn empty during weft picking and weft picking, but during fabric refining and reduction processing, the shape of the blank-treated part could not be maintained, so the voids were not maintained on the final processed paper. There was a problem that I couldn't. In particular, it is difficult to obtain the expected effect for elastic fabrics such as latent crimp yarn and span covering yarn. For this reason, there have been attempts to effectively provide voids by arranging water-soluble fibers or soluble fibers at regular intervals in the tissue and removing them during fabric processing as a method of imparting breathability to the fabric.

As an example of a typical weave that imparts a ventilation effect to the conventional fabric, a method is known in which polyvinyl alcohol (PVA) fibers are used as a part of the warp weft yarns to dissolve the woven dough in an arbitrary process after refining. In this method, since polyvinyl alcohol fiber itself is water-soluble, some of the fibers are dissolved during refining, and accordingly, the movement of adjacent fibers occurs and the stripe wire collapses and the ventilation effect is destroyed. SLIP is easy to occur in the warp or weft direction due to the excessive vibration action of the continuous refiner, and it is difficult to make a morphologically stable fabric as well as a ventilation effect.

For the above purposes, water-soluble polyvinyl alcohol fibers were mostly used, and for the PVA fibers, a resin having a polymerization degree of about 1700 to 3500 of modified polyvinyl alcohol was dissolved in a solvent, dry spinning, and then dry heat treatment; As manufactured by acetalization, this fiber absorbs moisture under high temperature and high humidity conditions, thereby weakening basic mechanical properties such as strength and elongation, and also swells easily by moisture, resulting in poor shape stability of the fabric. There is a problem that the maintenance of appropriate temperature and humidity is necessarily required for manufacturing, and while PVA fiber has excellent solubility, such as being completely dissolved in boiling water, the polymer bond of PVA fiber is not cut during dissolution and is completely polymerized in water. Since it is dissolved in the wastewater, the biological oxygen demand (BOD) and chemical oxygen demand (COD) values, which are the measurement standards for environmental pollution in wastewater treatment, are quite high, so the cost of wastewater treatment is relatively high. In addition, the price distributed in the market is also very expensive, so there is a limit to easily grafting.

In order to solve the disadvantages of PVA fibers, studies on usability and water-soluble synthetic resin have been conducted, and Korean Patent No. 10-2013-0072644 discloses a water-soluble polyester fiber and a method for manufacturing the same. In addition, since alkali reduction processing technology of alkali-soluble composite spinning products such as sea-island yarn and split yarn is commercialized, research on alkali-soluble polyester using polyester resin has been particularly active. Typically, terephthalic acid and ethylene glycol are the main components, and the resin is polymerized by copolymerizing 5-sodium sulfoisophthalic acid, isophthalic acid, polyoxyalkyl glycol having a molecular weight of 400 to 6000 and linear ester-forming dicarboxylic acid as modifying components. A method of fibrosis has been proposed. However, the resin prepared by the above method has 30 to 40 mol% of copolymer material added, so the manufacturing processability of the resin as well as the spinning processability of melt spinning and stretching for fiberization is extremely poor, and the manufactured fiber also has a strength of 0.6~ If it is used at a level of 1.0 g/denier and goes through processing processes such as weaving and knitting, the thread trimming occurs severely, resulting in a decrease in production efficiency and poor product quality.

In addition, alkali-soluble polyester is used for the purpose of being removed after elution from the final fabric as its purpose is applied to sea-island yarn, split yarn, etc., and thus the chemical resistance is weak and the polymer is designed so that the original physical properties are also very low. designed to be disassembled into For this reason, when the fiber is manufactured by single spinning, the physical properties of the fiber are low, and thus the spinning workability is further deteriorated.

The present invention has been devised to solve the above problems, and the first problem to be solved by the present invention is easy dissolution under alkali reduction / dissolution processing conditions, and weaving and weaving through improvement of physical properties such as strength and elongation of fibers and uniformity To provide an alkali-soluble polyester fiber with improved knitting properties and a method for manufacturing the same.

The second problem to be solved by the present invention is that it is easy to melt spinning even with a commercial single spinning facility, so it can be manufactured with a simple process, and has excellent ventilation effect and alkali-soluble polyester fiber with excellent weaving property with excellent shape stability. and to provide a method for manufacturing the same.

The present invention provides a polyester fiber comprising an alkali-soluble component, wherein the polyester fiber provides an alkali-soluble polyester fiber excellent in weaving property that satisfies all of the conditions of (1) to (4) below.

(1) Mono yarn fineness 4 de or less

(2) Mono yarn strength 3.6 ~ 4.0 g/de

(3) 45-55% elongation of mono yarn

(4) 95% or more should be completely dissolved within 30 minutes in 2.0% alkaline solution under normal pressure and 98℃ temperature conditions.

(5) 95% or more should be completely dissolved within 15 minutes in 2.0% alkaline solution under a pressure of ^{3kgf/cm 2 and a temperature of 120 ℃.}

According to a preferred embodiment of the present invention, the alkali-soluble component is an esterification reaction product in which an acid component containing dimethylsulfurisophthalate sodium salt (DMSIP) and a diol component containing ethylene glycol (EG) are reacted; and polyalkylene Glycol; This polycondensation may include an alkali-soluble copolyester.

According to another preferred embodiment of the present invention, the esterification product contains an acid component and a diol component in a molar ratio of 1: 1.1 to 2.0, and the dimethylsulfurisophthalate sodium salt (DMSIP) is 0.1 to 3.0 moles relative to the acid component. % may be included.

According to another preferred embodiment of the present invention, the alkali-soluble copolyester contains 7.0 to 14 parts by weight of polyalkylene glycol based on 100 parts by weight of the esterification reactant, and the molecular weight of the polyalkylene glycol is 1,000 to It can be 10,000.

According to another preferred embodiment of the present invention, the copolyester may have an intrinsic viscosity of 0.7 to 1.0 dl/g, and a melting temperature of 240 to 300 ℃.

According to another preferred embodiment of the present invention, the fineness of the polyester fiber may be 50 to 200 denier, and the number of filaments may be 18 to 100.

In addition, the present invention provides a mixed fiber processing yarn comprising any one of the polyester fibers.

In addition, the present invention provides a fabric comprising any one of the polyester fibers.

Further, the present invention comprises the steps of (1) preparing an esterification product in which an acid component containing dimethylsulfurisophthalate sodium salt (DMSIP) and a diol component containing ethylene glycol (EG) are reacted; (2) mixing and polycondensing the esterification reactant and polyethylene glycol (PEG) to prepare an alkali-soluble copolyester; and (3) spinning the copolyester and then stretching at a draw ratio of 2.5 to 4.0 It provides a method for producing an alkali-soluble polyester fiber excellent in weaving property comprising; to obtain a polyester fiber by performing a.

According to a preferred embodiment of the present invention, in the esterification reaction product of step (1), the acid component and the diol component are included in a molar ratio of 1:1.1 to 2.0, and the dimethylsulfurisophthalate sodium salt (DMSIP) is compared to the acid component. It is included in 0.1 to 3.0 mol%, and polyalkylene glycol may be included in an amount of 7.0 to 14 parts by weight based on 100 parts by weight of the esterification reactant in step (2).

According to another preferred embodiment of the present invention, the polycondensation reaction in step (2) may be performed under an antimony compound or a phosphorus compound catalyst.

According to another preferred embodiment of the present invention, the copolyester of step (2) may be prepared under a temperature of 250 to 300 °C and a pressure of 0.3 to 1.0 Torr.

According to another preferred embodiment of the present invention, in the stretching process of step (3), the first godet roller speed is 1000 to 2000 mpm, the temperature is 70 to 90° C., and the second godet roller speed is 3500 to 4700 mpm, The temperature can be carried out at 100 ~ 140 ℃.

According to another preferred embodiment of the present invention, the draw ratio in step (3) may be 3.0 to 4.0.

According to another preferred embodiment of the present invention, when the spinning of the step (3) is performed, the non-trimming rate may be 93 to 100%.

The alkali-soluble polyester fiber having excellent weaving properties and a method for producing the same of the present invention can satisfy excellent shape stability while having an excellent ventilation effect, and have an effect of easy melt spinning even with a commercial single spinning facility.

In addition, the alkali-soluble polyester fiber having excellent weaving properties of the present invention and its manufacturing method are easy to elute under alkali weight loss/elutation processing conditions, and weaving and knitting properties through improvement of physical properties such as fiber strength, elongation, etc. and uniformity This can be improved.

1 is a flowchart illustrating an alkali-soluble polyester fiber manufacturing process according to a preferred embodiment of the present invention.
2 is a schematic diagram of a manufacturing process of an alkali-soluble polyester fiber according to a preferred embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them.

As described above, in the conventional alkali-soluble polyester and its manufacturing method, the manufacturing processability of the polyester resin to be manufactured and the spinning processability when melt spinning and stretching thereof are low, and the weaving property is significantly lowered due to the remarkably low strength of the manufactured fiber. There was a problem that the production efficiency and the quality of the product were low as it was significantly lowered. In addition, in the case of performing single spinning, the physical properties of the fibers are low, and thus there is a problem in that spinning workability is significantly reduced.

Accordingly, the present inventor devised the present invention to improve the weaving and knitting properties by improving the physical properties and uniformity of the fibers while at the same time allowing the same dissolution under general alkali reduction/elution processing conditions.

Accordingly, in the present invention, as a polyester fiber containing an alkali-soluble component, the polyester fiber provides an alkali-soluble polyester fiber excellent in weaving property that satisfies all of the following conditions (1) to (4).

(1) Mono yarn fineness 4 de or less

(2) Mono yarn strength 3.6 ~ 4.0 g/de

(3) 45-55% elongation of mono yarn

(4) 95% or more should be completely dissolved within 30 minutes in 2.0% alkaline solution under normal pressure and 98℃ temperature conditions.

(5) 95% or more should be completely dissolved within 15 minutes in 2.0% alkaline solution under a pressure of ^{3kgf/cm 2 and a temperature of 120 ℃.}

Through this, under conditions of fineness of 4 de or less of mono yarn, the strength of mono yarn is remarkably high, 3.6 ~ 4.0 g/de, and the elongation satisfies the range of 45 ~ 55%, so physical properties such as strength are excellent, so operation yield in spinning conditions This has the effect of providing an alkali-soluble polyester fiber excellent in weaving property because yarn breakage does not occur. In addition, alkali-soluble polyester fibers can be melt-spun even with a single spinning facility, and in this case, the spinning processability is excellent. In addition, since the conditions of (4) and (5) are also satisfied at the same time and dissolution occurs easily under the alkali dissolution processing conditions, there is an advantage in that it has excellent ventilation effect and can satisfy excellent shape stability at the same time.

First, the alkali-soluble polyester fiber of the present invention satisfies the fineness of monofilament 4 de or less under the condition (1). In this case, the dissolution is easy under alkaline dissolution processing conditions.

In addition, in the alkali-soluble polyester fiber of the present invention, the strength of the monofilament under the condition (2) must satisfy 3.5 to 4.0 g/de. Through this, even when processing processes such as weaving and weaving are performed, there is almost no thread trimming, so production efficiency is high, and the quality of manufactured products is also improved. If the strength of the mono-yarn is less than 3.5 g/de, when the processing process is performed, the yarn trimming occurs frequently, thereby reducing production efficiency and lowering the quality of manufactured products.

In addition, the alkali-soluble polyester fiber of the present invention must satisfy the elongation of 45 to 55% of the mono yarn under condition (3). Through this, it is possible to manufacture polyester fibers having excellent dissolution properties under general alkali dissolution processing conditions.

If the elongation of the mono yarn is less than 45%, the dissolution rate is lowered, and non-elution may occur under alkaline elution conditions, and there may occur a problem of poor spinning operability due to overstretching, and if it exceeds 55%, incomplete stretching may occur. Due to the poor uniformity caused by this, the number of thread trimmings may increase during weaving, and the spinning operability may also deteriorate.

In the alkali-soluble polyester fiber of the present invention (4), 95% or more should be completely dissolved within 30 minutes in a 2.0% alkali solution under normal pressure and 98°C temperature conditions. In addition, the alkali-soluble polyester fiber of the present invention should be completely dissolved within 15 minutes in a 2.0% alkali solution under a pressure ^{of 3kgf/cm 2 and a temperature of 120 ℃ as the condition (5).} If the dissolution occurs at less than 95% under the above conditions, there may be a problem in that it is impossible to manufacture a fabric to which the desired ventilation effect is imparted due to reduced air permeability.

That is, the alkali-soluble polyester fiber of the present invention must satisfy all the conditions of (1) to (5) above, have adequate strength and elongation under a fineness of 4de or less, and have excellent dissolution properties and excellent breathability at the same time It can have weaving.

The alkali-soluble component included in the present invention is preferably an esterification reaction product in which an acid component containing dimethylsulfurisophthalate sodium salt (DMSIP) and a diol component containing ethylene glycol (EG) are reacted; and polyethylene glycol (PEG). ); This may include polycondensed alkali-soluble copolyester.

First, the acid component may include an aromatic polyvalent carboxylic acid having 6 to 14 carbon atoms. The aromatic polyhydric carboxylic acid having 6 to 12 carbon atoms may be at least one selected from the group consisting of terephthalic acid, dimethyl terephthalate, isophthalic acid and dimethyl isophthalate, and preferably terephthalic acid in terms of mechanical strength and cost of fibers. In addition, the acid component may further include a polyhydric carboxylic acid including a hetero ring or an aliphatic polyhydric carboxylic acid in addition to the aromatic polyhydric carboxylic acid. However, it may be more preferable to include an aromatic polyhydric carboxylic acid in terms of preventing a decrease in strength and heat resistance of the fiber, and even more preferably, it may be preferable in terms of improving the yarn strength of the fiber to include terephthalic acid.

Next, the dimethylsulfurisophthalate sodium salt (DMSIP) contained in the acidic component will be described. The chemical formula of dimethylsulfurisophthalate sodium salt (DMSIP) is as shown in Formula 1 below.

[Formula 1]

When an esterification product is prepared by including dimethylsulfurisophthalate sodium salt (DMSIP) in an acidic component, it satisfies excellent dissolution properties in an alkaline solution and at the same time improves reaction stability.

According to a preferred embodiment of the present invention, the dimethylsulfurisophthalate sodium salt (DMSIP) may be included in an amount of 0.1 to 3.0 mol% relative to the acidic component. If the dimethylsulfurisophthalate sodium salt (DMSIP) is contained in an amount of less than 0.1 mol%, there may be a problem in that the alkali elution property is lowered and thus the desired composite fiber cannot be manufactured, and when it is mixed in excess of 3.0 mol% There may be problems in that a large amount of diethylene glycol (DEG), which is a side reaction product, is generated due to a decrease in reaction stability, and a uniform dissolution characteristic cannot be obtained because the alkali dissolution characteristic is too high.

Next, a description will be given of a diol component that reacts with an acid component to generate an esterification product. The diol component that can be used in the present invention can be used without limitation if it is a commonly known diol component for producing polyester. For example, the diol component may be an aliphatic diol component having 2 to 14 carbon atoms. Specifically, the aliphatic diol component is ethylene glycol, diethylene glycol, neopentyl glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, propylene glycol, trimethyl glycol, tetramethylene glycol, penta It may be any one or more selected from the group consisting of methyl glycol, hexamethylene glycol, heptamethylene glycol, octamethylene glycol, nonamethylene glycol, decamethylene glycol, undecamethylene glycol, dodecamethylene glycol and tridecamethylene glycol. Preferably, it may be any one or more of ethylene glycol, diethylene glycol, neopentyl glycol, 1,3-propanediol, 1,4-butanediol, and 1,6-hexanediol. Preferably, it may be ethylene glycol in terms of securing stable spinning operability and securing excellent yarn strength.

According to a preferred embodiment of the present invention, the esterification reactant may include the acid component and the diol component in a molar ratio of 1:1.1 to 2.0. If the diol component is included in a molar ratio of less than 1:1.1 with respect to the acid component, there is a problem in that the degree of polymerization is lowered due to reduced reactivity, and when the molar ratio of 1:2.0 is exceeded, side reactants such as diethylene glycol may occur, and during the spinning process There is a problem that can cause thread cutting, which can significantly reduce workability, and can cause an increase in manufacturing cost due to the use of an excessive amount of diol.

The polycondensed alkali-soluble copolyester of the present invention is copolymerized by including the esterification product and polyalkylene glycol as a repeating unit. Compared to the case of using, it is possible to prevent the decrease in spinning operability due to frequent thread trimming and increase in pack pressure in the spinning process, and it can be spun stably even at a yarn speed of 4000mpm or more. It has the advantage of avoiding the problem of

The polyalkylene glycol may preferably be polyethylene glycol. Also, preferably, the molecular weight of the polyalkylene glycol may be 1,000 to 10,000. If the molecular weight is less than 1,000, it may cause an increase in alkali reduction process time due to a decrease in alkali dissolution and thus may cause alkali infringement in the unweighted part in the fabric, and the defect rate due to non-uniform dyeing in the dyeing process of the fiber is not uniform because the dissolution is not uniform. Increasing problems may arise. In addition, if the molecular weight exceeds 10,000, the polymerization reactivity is lowered, the glass transition temperature of the formed copolyester is significantly lowered, the thermal properties are lowered, there may be problems that radiation may not be easy.

Preferably, the copolyester may contain 7.0 to 14 parts by weight of polyalkylene glycol based on 100 parts by weight of the esterification reactant. If the polyalkylene glycol is included in an amount of less than 7 parts by weight, there may be a problem in that the alkali solubility is lowered. In addition, if the polyalkylene glycol is contained in excess of 14 parts by weight, the degree of polymerization is lowered and the glass transition temperature of the alkali-soluble copolyester is significantly lowered, thereby lowering thermal properties, and sufficient spinning speed and elongation when manufacturing it into a fiber Since this is not possible, there may be a problem that the process passability is significantly lowered.

In addition, the copolyester may have an intrinsic viscosity of 0.7 to 1.0 dl/g, more preferably 0.9 to 1.0 dl/g. If the intrinsic viscosity is less than 0.7 ㎗/g, there is a problem in that the spinning efficiency is lowered due to the frequent occurrence of yarn breakage due to a decrease in the mechanical strength of the fiber in the spinning process, and the uniform dissolution is difficult due to excessive dissolution property or the fiber-forming polymer There is a problem that can cause alkali intrusion. In addition, when the intrinsic viscosity exceeds 1.0 ㎗/g, spinning workability is good due to high mechanical strength, but alkali utilization is significantly lowered, and problems such as an increase in the time required for the weight reduction process and non-uniform dissolution may occur.

In addition, the copolyester may have a melting temperature of 240 ~ 300 ℃, more preferably 260 ~ 280 ℃. If the melting temperature is less than 240 ℃, there may be problems with non-melting and incomplete melting due to non-uniformity and poor spinning operability. In addition, when the melting temperature exceeds 300° C., there is a risk that the polymer may have poor spinning ability due to thermal decomposition and carbonization.

On the other hand, the fineness of the alkali-soluble polyester fiber of the present invention is 50 ~ 200 denier, the number of filaments is preferably 18 ~ 100, but is not limited thereto. If the fineness is less than 50 denier, frequent yarn cutting may occur during weaving, and after elution, fine pores are formed in the fabric to weaken the air permeability, and if the fineness exceeds 180 denier, the fabric after elution Due to the formation of large pores within the skin, there may be a problem in that the function of the clothing is lost due to the severe exposure of the skin.

In addition, the present invention provides a mixed fiber processing yarn comprising the alkali-soluble polyester fiber according to the present invention.

The mixed fibers may be mixed fibers by using any one of the fibers as the core yarn and the other as the core yarn, or by mixing different types of fibers without distinction between the core yarn and the yarn yarn.

In addition, the present invention provides a fabric comprising the alkali-soluble polyester fiber according to the present invention.

The term fabric used in the present invention is meant to include all fabrics or knitted fabrics.

First, the fabric may be a fabric woven using the alkali-soluble polyester fiber according to the present invention as any one or more of warp and weft yarns. The weaving may be made by any one method selected from the group consisting of plain weave, twill weave, weave weave and double weave. However, it is not limited to the base material of the fabric structure, and the density of warp and weft yarns in weaving is not particularly limited.

In addition, the fabric may be a knitted fabric including alkali-soluble polyester fiber as a yarn. The knitting may be performed by a method of weft knitting or warp knitting, and the specific method of knitting the weft and warp knitting may be a conventional knitting method of weft knitting or warp knitting.

Further, in order to solve the above problems, the present invention comprises the steps of (1) preparing an esterification reaction product in which an acid component containing dimethylsulfurisophthalate sodium salt (DMSIP) and a diol component containing ethylene glycol (EG) are reacted; (2) mixing and polycondensing the esterification reactant and polyalkylene glycol to prepare an alkali-soluble copolyester; and (3) spinning the copolyester and then performing a stretching process at a draw ratio of 2.5 to 4.0 It provides a method for producing an alkali-soluble polyester fiber having excellent weaving properties, comprising the step of obtaining a polyester fiber by performing the method.

Through this, by controlling the draw ratio to enable sufficient drawing and orientation, the physical properties and uniformity of the fiber can be improved to improve the weaving and knitting properties, and at the same time, excellent ventilation effect by facilitating dissolution under alkali reduction/dissolution processing conditions can be satisfied

Hereinafter, it will be described in detail except for the content overlapping with the above-mentioned content.

Specifically, Figure 1 is an alkali-soluble polyester fiber manufacturing process flow chart according to a preferred embodiment of the present invention. Referring to the drawings, (1) preparing an alkali-soluble copolyester by condensation/polymerizing the esterification product and polyalkylene glycol prepared through the esterification product preparation step (S100) (S200) can be performed. have. In addition, the desired alkali-soluble polyester fiber can be obtained by spinning the copolyester and performing a stretching process step (S300).

First, (1) a step (S100) of preparing an esterification product in which an acid component containing dimethylsulfurisophthalate sodium salt (DMSIP) and a diol component containing ethylene glycol (EG) are reacted will be described.

In the esterification reaction product of step (1), the acid component and the diol component are included in a molar ratio of 1:1.1 to 2.0, and the dimethylsulfurisophthalate sodium salt (DMSIP) is contained in an amount of 0.1 to 3.0 mol% compared to the acid component, Polyalkylene glycol may be included in an amount of 7.0 to 14 parts by weight based on 100 parts by weight of the esterification product of step (2).

The mixing period of dimethylsulfurisophthalate sodium salt (DMSIP), the acidic compound included in the acidic component, and ethylene glycol to prepare the esterification product is not limited, and dimethylsulfurisophthalate sodium salt (DMSIP) is mixed with the acidic component and ethylene glycol. It may be added during the esterification reaction of glycol, or may be added from the start of the reaction.

The esterification reactant of step (1) may be preferably prepared at a temperature of 200 to 270° C. and a pressure of 1100 to 1350 Torr. If the above conditions are not satisfied, a large amount of diethyl glycol as a side reaction product may be formed due to a prolonged esterification reaction time or the effect of high temperature, and there is a problem that an esterification product suitable for a polycondensation reaction cannot be formed due to a decrease in reactivity. There may be problems with

Next, the step (S200) of preparing an alkali-soluble copolyester by mixing and polycondensing the esterification product and polyalkylene glycol (2) will be described.

The copolyester of step (2) can be prepared at a temperature of 250 to 300 ° C and a pressure of 0.3 to 1.0 Torr, and if the above conditions are not satisfied, there are problems such as delay of reaction time, lowering of polymerization degree and inducing thermal decomposition This can happen.

According to a preferred embodiment of the present invention, the polycondensation reaction in step (2) may be carried out in the presence of an antimony compound or a phosphorus compound catalyst. Preferably, an antimony compound may be used, and a phosphorus compound may be used to suppress discoloration of color at high temperatures. As antimony compounds, antimony oxides such as antimony trioxide, antimony tetraoxide, and antimony pentoxide, antimony trisulfide, antimony trifluoride, antimony trichloride, etc., antimony triacetate, antimony benzoate, antimontristearate, etc. can be used. can

In particular, it is preferable to use antimony trioxide, antimony triacetate, etc. because they show excellent effects, and the amount used is preferably 100 to 600 ppm based on the total weight of the polymer obtained after polymerization.

As the phosphorus compound, phosphoric acid, trimethyl phosphoric acid, tributyl phosphoric acid, etc. and derivatives thereof are preferably used. Among them, trimethyl phosphoric acid, triethyl phosphoric acid, or triphenyl phosphoric acid is preferable because of its excellent effect, The amount of the phosphorus compound used is preferably 100 to 500 ppm based on the total weight of the polymer obtained after polymerization.

Next, a step (S300) of obtaining a polyester fiber by performing a drawing process at a draw ratio of 2.5 to 4.0 after spinning the copolyester (3) will be described.

The copolyester prepared as described above is preferably melt-spun and then the stretching process is performed, through which it is possible to optimize the alignment control of the polymer forming the fiber. In addition, in the present invention, by preparing an alkali-soluble polyester fiber having excellent dissolution property having a desired strength and elongation by setting a draw ratio of 2.5 to 4.0, it is possible to have excellent ventilation effect and remarkably improved weaving property at the same time.

First, if the spinning step is described, the spinning speed of the spinning may be 4000mpm or more, preferably 4000 ~ 500mpm, more preferably 4050 ~ 4300mpm. If the spinning speed is less than 4000 mpm, there is a problem in that the production cost is increased due to the decrease in production. Also, due to the poor sterilization system, trimming may occur frequently during weaving. If it exceeds 5000 mpm, frequent trimming and dissolution speed during the spinning process. There may be a problem of lowering.

In addition, the spinning temperature may be 240 ~ 300 ℃, preferably 260 ~ 280 ℃ of the spinning temperature. If the spinning temperature is less than 240 ℃ or exceeds 300 ℃, the melt flow property of the copolymer is not suitable for spinning, problems such as deterioration of yarn properties or workability may occur.

In addition, the discharge amount (production amount) from the spinning nozzle expressed by the following relational formula 1 preferably satisfies 20 to 50 g/min, and more preferably 30 to 45 g/min. In this case, it is possible to obtain an alkali-soluble polyester fiber that has the desired strength and elongation, has excellent dissolution properties, and can satisfy both the ventilation effect and the weaving property. If it is less than 20 g/min, or if it exceeds 50 g/min, the strength may be lowered and process passability may be lowered, or dissolution characteristics may be lowered.

[Relational Expression 1]

Discharge (production) =

Next, a step of performing the stretching process will be described.

The stretching process of the present invention may further include a cooling step. Specifically, Figure 2 is a schematic diagram of a manufacturing process of a polyester fiber according to a preferred embodiment of the present invention. Referring to the drawings, the present invention melts the copolyester and then injects it through the copolyester input unit 100 to perform spinning in the spinning unit 200 and cooling through the cooling unit 300 . have. Furthermore, the first godet roller 400 and the second godet roller 500 may be stretched at a draw ratio of 2.5 to 4.0 and wound in a winding unit 600 to obtain a desired alkali-soluble polyester fiber.

As described above, by producing an alkali-soluble polyester fiber excellent in dissolution property having a desired strength and elongation by setting the draw ratio to 2.5 to 4.0, preferably 3.0 to 4.0, it has excellent ventilation effect and significantly improved It has the effect of satisfying weaving. If the draw ratio is less than 2.5, the uniformity is lowered, and the yarn uniformity is lowered, so that the weaving property is reduced due to easy trimming may occur. In addition, if the draw ratio exceeds 4.0, a problem in that the dissolution cannot be completed under the conditions desired by the present invention may occur because the thread cutting phenomenon due to overstretching is accelerated and the elution rate is lowered.

In addition, in the stretching process of step (3), the first godet roller speed is 1000 ~ 2000 mpm, the temperature is 70 ~ 90 ℃, the second godet roller speed is 3500 ~ 4700 mpm, and the temperature is 100 ~ 140 ℃. It is preferable, and through this, it is possible to prevent the thread cutting phenomenon occurring during stretching.

In addition, in order for the alkali-soluble polyester fiber prepared according to the present invention to have an excellent ventilation effect and to satisfy improved weaving properties, it is preferable that the yarn-free rate is 93 to 100% when spinning in step (3). , more preferably 95 to 100%.

The present invention will be described in more detail through the following examples, but the following examples are not intended to limit the scope of the present invention, which should be construed to aid understanding of the present invention.

Example One

It contains an acid component including terephthalic acid (TPA) and dimethylsulfurisophthalate sodium salt (DMSIP) and an ethylene glycol (EG) compound in a molar ratio of 1:1.2, and the dimethylsulfurisophthalate sodium salt (DMSIP) is 1.5 compared to the acid component. Mixing was performed to include mole %. The mixing was carried out under a pressure of 250 to 1140 Torr, and an esterification reaction was performed to obtain an ester product, and the reaction rate was 97.5%. The formed ester reactant is transferred to a polycondensation reactor, 10.0 parts by weight of polyethylene glycol (PEG) having a molecular weight of 6000 is added thereto with respect to 100 parts by weight of the ester reactant, and 400 ppm of antimony trioxide is added as a condensation polymerization catalyst to obtain a final pressure of 0.5 Torr. The copolyester resin was prepared after carrying out the polycondensation reaction by raising the temperature to 285 while reducing the pressure as slowly as possible. Single fibers are melt-spun at 270 ° C using the soluble polyester resin, and first wound at 80 ° C at a yarn speed of 1300 mpm (m/min) through a first godet roller, and 4050 mpm ( m/min) at a yarn speed of 120° C., followed by a second winding and stretching. (At this time, the draw ratio is 3.12.)

Example 2 to 9

It was carried out in the same manner as in Example 1, except that it was carried out under the conditions of Tables 1 and 2 below.

comparative example 1 to 5

It was carried out in the same manner as in Example 1, except that it was carried out under the conditions shown in Table 2 below.

Experimental example One. dissolution Rating(1)

In order to evaluate the dissolution property of the soluble polyester fiber, a knitted fabric was prepared using a socks knitting machine. At this time, in order to measure the weight reduction rate before and after dissolution, a knitted fabric was prepared by braiding SD 75denier and 24filament of general polyester drawn with alkali resistance. At this time, the dissolution test was conducted under the conditions of NaOH concentration of 2%, 3%, atmospheric pressure 98, and elution time of 15 and 30 minutes. When 100% dissolution is completed under the above conditions, it can be determined that dissolution is completed under the conventional fabric weight loss/dissolution processing conditions.

Experimental example 2. dissolution evaluation(2)

Dissolution was evaluated in the same manner as in Experimental Example 1, but the dissolution test was performed in a 2.0% alkaline solution under a pressure of ^{3 kgf/cm 2 and a temperature of 120 ° C. for 15 minutes.}

Experimental example 3. no-failure rate and process passability evaluation

'Process passability' refers to one of the above conditions when the spinning process satisfies both the non-tread rate of 93% or more when operating for 24 hours per machine (hereinafter referred to as M/C) and less than 2 times per 100m of fabric when using woven weft yarns. If either condition was not satisfied, it was marked as if both conditions were not satisfied.

Experimental example 4. Strength and Elongation

Strength and elongation were measured by applying a speed of 200 cm/min and a gripping distance of 50 cm using an automatic tensile tester (Textechno). The strength and elongation are the value (g/de) obtained by dividing the load applied by the denier (de) when the fiber is stretched until it is cut by applying a constant force to the strength, and the value expressed as a percentage of the initial length to the stretched length (%) ) was defined as a believer.

Experimental example 5. uniformity evaluation

The uniformity was measured as the average value of the measured values of the uniformity per 100 m using the Uster TESTER 6-C800 instrument under the model name of Uster Technologies.

Table 1.

Table 2.

Looking at Tables 1 and 2, in the case of Examples 1 to 9, it can be seen that the stretch ratio corresponds to 2.5 to 4.0, so that the strength of the manufactured fiber is in the range of 3.6 to 4.0 g/de, and the elongation corresponds to 45 to 55%. can Accordingly, it can be confirmed that the dissolution property is excellent and the process passability is also excellent, thereby satisfying the excellent ventilation effect and weaving property.

Specifically, in the case of Examples 5 and 6, the strength was slightly lowered to 3.61 g/de compared to the case of Examples 7 to 9, and the elongation had a value closer to 55%. In addition, it can be seen that the process passability is somewhat lower than that of Examples 1 and 7 to 9. Through this, it can be confirmed that, when the draw ratio is 3.0 to 4.0, fibers having superior weaving properties and dissolution properties can be obtained compared to the case of 2.5 or more and less than 3.0.

In addition, since the strength of Examples 1 and 2 is slightly higher than that of Examples 3 and 4, the discharge amount is preferably 20 to 50 g/min, more preferably 30 to 45 g/min. It can be confirmed that the desired physical properties and process passability are achieved.

On the other hand, in the case of Comparative Examples 1 to 5, the draw ratio is less than 2.5 or 4.0, in this case through the table above, the strength is less than 3.6 g/de or exceeds 4.0 g/de, and the elongation is also 45 to 55 It can be seen that the process passability is remarkably poor as it exceeds the % range. In addition, it can be confirmed that the weaving effect of the fiber as well as the ventilation effect is reduced when the draw ratio is less than 2.5 or greater than 4.0 through the remarkably lowered dissolution property.

100 copolyester inlet
200 radiant
300 cooling
400 1st godet roller
500 2nd Godtroller
600 winding

Claims (15)

As a polyester fiber comprising an alkali-soluble component,
The alkali-soluble component is an esterification reaction product in which an acid component containing dimethylsulfurisophthalate sodium salt (DMSIP) and a diol component containing ethylene glycol (EG) are reacted; And polyalkylene glycol; Containing this poly-condensed alkali-soluble copolyester,
The intrinsic viscosity of the alkali-soluble copolyester is 0.7 ~ 1.0 dl / g, the melting temperature is 260 ~ 280 ℃,
The polyester fiber is an alkali-soluble polyester fiber excellent in weaving property that satisfies all of the conditions of (1) to (5) below.
(1) Mono yarn fineness 4 de or less
(2) Mono yarn strength 3.6 ~ 4.0 g/de
(3) 45-55% elongation of mono yarn
(4) 95% or more should be completely dissolved within 30 minutes in 2.0% alkaline solution under normal pressure and temperature of 98℃
(5) 95% or more should be completely dissolved within 15 minutes in 2.0% alkaline solution under a pressure of ^{3kgf/cm 2 and a temperature of 120 ℃}
delete According to claim 1,
The esterification product contains an acid component and a diol component in a molar ratio of 1: 1.1 to 2.0, and the dimethylsulfurisophthalate sodium salt (DMSIP) is contained in an amount of 0.1 to 3.0 mol% relative to the acid component. This excellent alkali-soluble polyester fiber.
According to claim 1,
The alkali-soluble copolyester contains 7.0 to 14 parts by weight of polyalkylene glycol based on 100 parts by weight of the esterification product, and alkali excellent in weaving property, characterized in that the molecular weight of the polyalkylene glycol is 1,000 to 10,000. Soluble polyester fiber.
delete According to claim 1,
The polyester fiber has a fineness of 50 to 200 denier, and the number of filaments is 18 to 100. An alkali-soluble polyester fiber having excellent weaving properties.
A mixed fiber processing yarn comprising the polyester fiber according to any one of claims 1, 3, 4 and 6.
A fabric comprising the polyester fiber according to any one of claims 1, 3, 4 and 6.
(1) preparing an esterification product in which an acid component containing dimethylsulfurisophthalate sodium salt (DMSIP) and a diol component containing ethylene glycol (EG) are reacted;
(2) mixing and polycondensing the esterification reactant and polyethylene glycol (PEG) to prepare an alkali-soluble copolyester having an intrinsic viscosity of 0.7 to 1.0 dl/g and a melting temperature of 260 to 280°C; and
(3) after spinning the copolyester, performing a drawing process at a draw ratio of 3.0 to 4.0 to obtain a polyester fiber;
The obtained polyester fiber is a method for producing an alkali-soluble polyester fiber excellent in weaving property that satisfies all of the following conditions (1) to (5).
(1) Mono yarn fineness 4 de or less
(2) Mono yarn strength 3.6 ~ 4.0 g/de
(3) 45-55% elongation of mono yarn
(4) 95% or more should be completely dissolved within 30 minutes in 2.0% alkaline solution under normal pressure and temperature of 98℃
(5) 95% or more should be completely dissolved within 15 minutes in 2.0% alkaline solution under a pressure of ^{3kgf/cm 2 and a temperature of 120 ℃}
10. The method of claim 9,
In the esterification reaction product of step (1), the acid component and the diol component are included in a molar ratio of 1: 1.1 to 2.0, and the dimethylsulfurisophthalate sodium salt (DMSIP) is included in an amount of 0.1 to 3.0 mol% compared to the acid component,
A method for producing an alkali-soluble polyester fiber excellent in weaving, characterized in that it contains 7.0 to 14 parts by weight of polyalkylene glycol based on 100 parts by weight of the esterification product of step (2).
10. The method of claim 9,
The polycondensation reaction of step (2) is an alkali-soluble polyester fiber manufacturing method with excellent weaving property, characterized in that it is performed under an antimony compound or a phosphorus compound catalyst.
10. The method of claim 9,
The copolyester of step (2) is an alkali-soluble polyester fiber manufacturing method having excellent weaving property, characterized in that it is prepared at a temperature of 250 to 300 ℃ and a pressure of 0.3 to 1.0 Torr.
10. The method of claim 9,
The stretching process in step (3) is characterized in that the primary godet roller speed is 1000 ~ 2000 mpm, the temperature is 70 ~ 90 ℃, the second godet roller speed is 3500 ~ 4700 mpm, and the temperature is 100 ~ 140 ℃ A method for producing alkali-soluble polyester fibers with excellent weaving properties.
delete 10. The method of claim 9,
A method for producing an alkali-soluble polyester fiber having excellent weaving properties, characterized in that the yarn-free rate is 93 to 100% when the spinning of step (3) is performed.

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