KR20120078210A - Nonwoven fabric having elastic recovery properties - Google Patents

Abstract

PURPOSE: A method for fabricating non-woven fabrics is provided to minimize the use of 1,4-butane diol and to easily fabricate non-woven fabric without additional yarns of low melting point. CONSTITUTION: A non-woven fabric with elastic recovery rate contains elastic conjugate fibers fabricated with 40-80 mm of elastic polyester(100) and 50-90 mm of general polyester(200). The elastic polyester is prepared using terephthalic acid(TPA) and isophthalic acid(IPA) as diacid and ethylene glycol(EG), 1,4-butanediol(1,4-BD), and polytetramethylene glycol(PTMG) as diol. The weight ratio of the elastic polyester and general polyester is 30:70-70:30.

Description

Nonwoven fabric with elastic recovery rate {NONWOVEN FABRIC HAVING ELASTIC RECOVERY PROPERTIES}

The present invention relates to a nonwoven fabric having an elastic recovery rate, and more particularly, to a nonwoven fabric having an elastic recovery rate that is easy to manufacture and has an excellent elastic recovery rate by being manufactured at an elastic composite fiber melted at a low temperature.

In general, polyurethane fibers are commonly used as polyurethane fibers, commonly known as spandex. Polyurethane fibers do not dye well in acid dyes because they do not have dye seats in their molecular structure, so they are dyed using disperse dyes. However, they have significantly lower fastness than acid dyes. When mixed with other materials such as ester fibers, high temperature dyeing is difficult to use and there are many limitations in post-processing after weaving the fabric.

In addition, when the polyurethane fiber is exposed to the atmosphere, the physical properties and colors of elastic fibers change due to sunlight, and are easily discolored by waste gases in the atmosphere. Can not be used as a yarn for fabrics.

The development of a polyester-based elastomer that is easy to manufacture and inexpensive to manufacture due to the problems of the polyurethane crab elastomer as described above, co-polyester having a lot of elastic force is currently manufactured and sold.

In many documents, such as Korean Patent Application Nos. 1996-0030520 and 1996-080489, dimethyl terephthalate (DMT) is converted into diol as a diol by the polymerization method of a polyether ester elastomer. 1,4-butanediol (1,4-Butanediol: 1,4-BD) and polytetramethylene glycol (PTMG) are used.

As described above, the copolyester polyester having an elastic force produced by using 1,4-butanediol as a diol component has a problem in that manufacturing cost increases as the amount of 1,4-butanediol is increased as 1,4-butanediol is an expensive material. there was.

In addition, a composite fiber having an elastic force and an elastic recovery force is developed by complex spinning the elastic polyester as described above with a general polyester, and is used in an elastic nonwoven fabric using the same.

However, in order to prepare the nonwoven fabric with the composite polyester of the presently developed elastic polyester, a fiber containing a polymer having a low heat melting performance in order to entangle the fibers was required separately.

In order to solve this problem, Japanese Patent Application No. 2002-131545 uses a low melting point polymer and a high melting point polymer to produce a hollow side by side type fiber to give high fiber, flexibility, and heat adhesion to the fiber. However, the composite yarn of the patent had a low elastic recovery rate and a low melting point polymer using 1.4-butanediol and adipic acid, aliphatic lactone, there was a high manufacturing cost.

The present invention has been invented to solve the above problems, and aims to provide a nonwoven fabric having an elastic recovery rate by using an elastic polyester made of a low-cost raw material by minimizing the amount of 1,4-butanediol.

In addition, an object of the present invention is to provide a nonwoven fabric having an elastic recovery rate that is easy to manufacture by using an elastic composite fiber having excellent adhesion performance due to a low melting point function.

In the present invention, dimethyl terephthalate (Dimethyl Terephthalate (DMT) and dimethyl isophthalate (DMI) or terephthalic acid (Terephthalic acid (TPA) and isophthalic acid (Isophthalic Acid (IPA)) as an acid component (Diacid) ethylene glycol ( Ethylene glycol (EG), 1,4-butanediol (1,4-Butanediol: 1,4-BD), polytetramethyleneglycol (PTMG) made of a diol component (polyol) and an elastic polyester and a general polyester It provides a nonwoven fabric having an elastic recovery rate, characterized in that it comprises an elastic composite fiber.

In addition, the nonwoven fabric provides a non-woven fabric having an elastic recovery rate, characterized in that it is made of 40 ~ 80 mm elastic composite fibers and 50 ~ 90 mm general polyester short fibers.

In addition, the nonwoven fabric provides a nonwoven fabric having an elastic recovery rate, characterized in that the elastic composite fibers and the general polyester short fibers are mixed in a weight ratio of 30:70 ~ 70:30.

In addition, the nonwoven fabric provides a nonwoven fabric having an elastic recovery rate, characterized in that it is manufactured by a thermal bonding method.

In addition, the elastic polyester provides a non-woven fabric having an elastic recovery rate, characterized in that the acid component and the diol component is prepared by polymerization in a molar ratio of 0.9 to 1.1: 0.9 to 1.1.

In addition, the acid component of the elastic polyester is dimethyl terephthalate (DMT), dimethyl isophthalate (DMI) provides a non-woven fabric having an elastic recovery rate, characterized in that the mixture is prepared in a molar ratio of 0.65 ~ 0.80: 0.2 ~ 0.35.

In addition, the acid component of the elastic polyester provides a non-woven fabric having an elastic recovery rate characterized in that the terephthalic acid (TPA) and isophthalic acid (IPA) is prepared by mixing in a molar ratio of 0.65 ~ 0.80: 0.2 ~ 0.35.

In addition, the diol component of the elastic polyester is ethylene glycol (EG), 1,4-butanediol (1,4-BD), polytetramethylene glycol (PTMG) in a molar ratio of 0.7 to 0.9: 0.05 to 0.15: 0.05 to 0.15 It provides a non-woven fabric having an elastic recovery rate characterized in that it is manufactured by mixing.

In addition, the melting point of the elastic polyester provides a non-woven fabric having an elastic recovery rate, characterized in that 150 ~ 180 ℃.

In addition, the elastic recovery rate of the elastic polyester provides a nonwoven fabric having an elastic recovery rate, characterized in that 50 to 80%.

In addition, the elastic polyester, dimethyl terephthalate (Dimethyl Terephthalate (DMT) and dimethyl isophthalate (Dimethyl isophthalate (DMI)), terephthalic acid (Terephthalic Acid (TPA) and isophthalic acid (Isophthalic Acid: IPA) acid component (Diacid) A) mixing a diol component into ethylene glycol (EG), 1,4-butanediol (1,4-Butanediol: 1,4-BD), and polytetramethylene glycol (PTMG); An esterification step of esterifying the mixture at 220 to 270 ° C. for 2 to 4 hours at 2.0 to 2.5 kgf / cm 2 pressure; It provides a non-woven fabric having an elastic recovery rate characterized in that the ester reactant is prepared by including a polymerization step of polymerization in a vacuum at 0.1 ~ 1 Torr or less at 250 ~ 295 ℃, 40 ~ 120 minutes.

In addition, the composite fiber provides a non-woven fabric having an elastic recovery rate, characterized in that it is sheath-core type or side by side type.

In addition, the composite fiber provides a non-woven fabric having an elastic recovery rate, characterized in that the elastic polyester and the general polyester is produced in a weight ratio of 40:60 ~ 60:40.

In addition, the elastic composite fiber, dimethyl terephthalate (Dimethyl Terephthalate (DMT) and dimethyl isophthalate (Dimethyl isophthalate: DMI) or terephthalic acid (Terephthalic Acid (TPA) and isophthalic acid (Isophthalic Acid: IPA) acid component (Diacid) ) Ethylene glycol (EG), 1,4-butanediol (1,4-Butanediol: 1,4-BD), polytetramethyleneglycol (PTMG) is an elastic poly to prepare a diol component (Diol) Elastic polyester polymerization process for producing ester; Spinning the elastic polyester and the general polyester into a sheath-core or side by side fibers at a spinning speed of 800 to 2000mpm at 230 to 290 ° C; An extending process of stretching the spun fiber at a stretching ratio of 1.5 to 4.5 at 40 to 100 ° C; It provides a non-woven fabric having an elastic recovery rate, characterized in that it is produced comprising a heat treatment step of heat-treating the stretched fiber to 40 ~ 90 ℃.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that, in the drawings, the same components or parts have the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

As used herein, the terms "about", "substantially", and the like, are used at, or in close proximity to, numerical values when manufacturing and material tolerances inherent in the meanings indicated are intended to aid the understanding of the invention. Accurate or absolute figures are used to assist in the prevention of unfair use by unscrupulous infringers.

In the present invention, dimethyl terephthalate (Dimethyl terephthalate (DMT) and dimethyl isophthalate (Dimethyl isophthalate (DMI) or terephthalic acid (Terephthalic acid: TPA) and isophthalic acid (Isophthalic Acid (IPA)) as ethylene glycol (Ethylene) glycol (EG), 1,4-butanediol (1,4-Butanediol: 1,4-BD), polytetramethyleneglycol (PTMG) as an elastic polyester made of the diol component (Diol) and general polyester It relates to a nonwoven fabric having an elastic recovery rate, including the elastic composite fibers to be produced.

The elastic polyester is ethylene glycol with dimethyl terephthalate (DMT) and dimethyl isophthalate (DMI) or terephthalic acid (TPA) and isophthalic acid (IPA) as a diacid. (Ethylene glycol: EG), 1,4-butanediol (1,4-Butanediol: 1,4-BD), polytetramethyleneglycol (PTMG) are prepared as a diol component (Diol).

The acid component (Diacid) is dimethyl terephthalate (Dimethyl Terephthalate (DMT) and dimethyl isophthalate (Dimethyl isophthalate (DMI) or terephthalic acid (Terephthalic Acid (TPA) and isophthalic acid (Isophthalic Acid (IPA)) by using a dimethyl terephthalate (DMT) and terephthalic acid (TPA) react with the diol component to form crystalline regions, and dimethyl isophthalate (DMI) and isophthalic acid (IPA) react with the diol components to form amorphous regions, Impart elasticity.

The mixing ratio of the dimethyl terephthalate (DMT) and dimethyl isophthalate (DMI) is preferably prepared in a molar ratio of 0.65 ~ 0.80: 0.2 ~ 0.35, the mixing ratio of terephthalic acid (TPA) and isophthalic acid (IPA) is also molar ratio 0.65 ~ 0.80: It is preferable that it is manufactured by 0.2-0.35.

The molar ratio of the dimethyl isophthalate (DMI) and isophthalic acid (IPA) is used less than the above range and the elastic recovery rate may be lowered, the low melting point function may not appear, dimethyl isophthalate (DMI) and isophthalic acid (IPA) When the molar ratio of) is used more than the above range, the physical properties of the elastic polyester may be lowered, thereby limiting its use.

The diol component (Diol) is ethylene glycol (Ethylene glycol (EG), 1,4-butanediol (1,4-Butanediol: 1,4-BD), polytetramethylene glycol (Polytetramethyleneglycol: PTMG) to be used as (EG) and 1,4-butanediol react with the acid component to form a crystal region, and polytetramethylene glycol (PTMG) reacts with the acid component to form an amorphous region to impart low melting point function and elastic force of the elastic polyester.

The mixing ratio of the ethylene glycol (EG), 1,4-butanediol (1,4-BD), polytetramethylene glycol (PTMG) is preferably prepared in a molar ratio of 0.7 to 0.9: 0.05 to 0.15: 0.05 to 0.15. The molar ratio of the polytetramethylene glycol (PTMG) is used less than the above range and the elastic recovery rate may be reduced, the low melting point function may not appear, the molar ratio of the dipolytetramethylene glycol (PTMG) is used more than the above range If so, the physical properties of the elastic polyester may be lowered, which may limit its use.

In addition, it is preferable to use the thing whose molecular weight of the said polytetramethylene glycol (PTMG) is 1500-2000. If the polytetramethylene glycol (PTMG) is out of the range of the molecular weight, the elastic force and physical properties of the elastic polyester produced may not be suitable for use.

It is preferable that the acid component and the diol component are mixed and polymerized in a molar ratio of 0.9 to 1.1: 0.9 to 1.1.

If any one of the acid component and the diol component is mixed too much, it will be discarded without being used for polymerization, and the acid component and the diol component will be preferably mixed in a similar amount.

Dimethyl terephthalate (DMT), dimethyl isophthalate (DMI) as the acid component (Diacid) ethylene glycol (EG), 1,4-butanediol (1,4-BD), polytetramethylene glycol (PTMG) as described above The elastic polyester made of the diol component (Diol) is prepared at a melting point of 150 ~ 180 ℃, elastic recovery rate 50 ~ 80%.

The elastic polyester is prepared by a mixing step, an esterification step, and a polymerization step.

The mixing step is methyl terephthalate (Dimethyl Terephthalate: DMT), dimethyl isophthalate (Dimethyl isophthalate: DMI) ethylene glycol (Ethylene glycol: EG), 1,4-butanediol (1,4-Butanediol: 1, 4-BD), polytetramethyleneglycol (PTMG) is a step of mixing the diol component it will be preferable to perform the mixing step at 200 ~ 230 ℃ to smoothly proceed to the next step of the esterification step.

In the mixing step, the acid component and the diol component may be preferably mixed in a molar ratio of 0.9 to 1.1: 0.9 to 1.1, as described above.

In addition, the acid component is dimethyl terephthalate (DMT), dimethyl isophthalate (DMI) is mixed in a molar ratio of 0.65 ~ 0.80: 0.2 ~ 0.35, the diol component is ethylene glycol (EG), 1,4-butanediol (1, 4-BD), polytetramethylene glycol (PTMG) is preferably prepared by mixing in a molar ratio of 0.7 ~ 0.9: 0.05 ~ 0.15: 0.05 ~ 0.15.

The polytetramethylene glycol (PTMG) preferably has a molecular weight of 1500 to 2000.

The esterification step is the acid component of dimethyl terephthalate (DMT), dimethyl isophthalate (DMI) and diol component of ethylene glycol (EG), 1,4-butanediol (1,4-BD), polytetramethylene glycol (PTMG) To esterify the ester to produce an oligomer ester reactant is a step of esterifying the mixture of the mixing step at 220 ~ 270 ℃, 2 ~ 4 hours under 2.0 ~ 2.5 kgf / cm 2 pressure.

The polymerization step is a step of polymerizing the ester reactant produced in the esterification step to polymerize the low-melting point polyester is a step of polymerization for 250 to 295 ℃, 40 to 120 minutes in a vacuum of 0.1 ~ 1 Torr or less.

The reaction catalyst may be used in the esterification reaction and the polymerization step, and the reaction catalyst may be an antimony catalyst such as antimony trioxide (Sb ₂ O ₃ ), a titanium catalyst such as tetrabutyl titanate (TBT), or magnesium acetate ( Acetate catalysts such as Magnesium Acetate and Calcium Acetate can be used. In addition, thermal stabilizers and antioxidants, which are phosphorus sulfides, may be added to prevent thermal decomposition during polymerization.

The general polyester may be poly trimethylene terephthalate (PTT), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), and polyethylene terephthalate (PET). It would be desirable.

The elastic composite fiber of the present invention made of the elastic polyester and the general polyester is formed in a sheath-core type or a side by side type as shown in FIG. 1 or 2. Can be.

Figure 1 shows various embodiments of side-by-side type of elastic composite fibers used in the present invention, Figure 2 is a view showing an embodiment of the sheath-core type of the elastic composite fibers of the present invention.

When the elastic composite fiber of the present invention is formed in a sheath-core type, as shown in FIG. It should be formed so that elastic force and low melting point function of elastic polyester can be expressed.

It is preferable that the elastic polyester and the general polyester are manufactured in a weight ratio of 40:60 to 60:40. When the elastic polyester is included in less than 40 by weight ratio, the elastic force and low melting point function may be reduced, when the weight ratio exceeds 60, the content of the general polyester may be reduced to decrease the physical properties of the composite fiber.

The elastic composite fiber of the present invention as described above is produced by an elastic polyester polymerization process, a composite spinning process, a stretching process to stretch and a heat treatment process to heat treatment.

The elastic polyester polymerization process is a process of polymerizing the elastic polyester including a mixing step, an esterification step, and a polymerization step of mixing an acid component and a diol component as described above.

The spinning process is a process of spinning the elastic polyester and the general polyester into sheath-core or side by side fibers at a spinning speed of 800 to 2000mpm at 230 ~ 290 ℃ .

In the spinning process, the elastic polyester and the general polyester will be preferable to spin in a weight ratio of 40:60 ~ 60:40.

The stretching step is to stretch the spun fiber at a stretching ratio of 1.5 to 4.5 at 40 ~ 100 ℃ it will be preferable to stretch in a warm bath.

The heat treatment step is a step of heat-treating the stretched fiber at 40 ~ 90 ℃ can be carried out by dry heat, wet heat method.

Non-woven fabric having an elastic recovery rate according to the present invention can be produced only by the elastic composite fibers made of the elastic polyester and the general polyester described above, but mixed with the general polyester short fibers to improve the physical properties. It can manufacture.

As the general polyester short fibers, poly trimethylene terephthalate (PTT) short fibers, polyethylene terephthalate (PET) short fibers may be used, and polyethylene terephthalate (PET) may be used.

When the nonwoven fabric is prepared by mixing the elastic composite fibers and the general polyester short fiber, the elastic composite fiber and the general polyester end using 40 to 80 mm elastic composite fiber and 50 to 90 mm general polyester short fiber It would be desirable for the fibers to be mixed in a weight ratio of 30:70 to 70:30.

When the content of the elastic composite fiber is less than 30 by weight ratio, the elastic recovery rate of the nonwoven fabric is lowered, and when the content of the elastic composite fiber exceeds 70 by weight ratio, the effect of the addition of ordinary polyester short fibers is insignificant.

It is preferable that the nonwoven fabric is made of an elastic nonwoven fabric by a thermal bonding method.

The thermal bonding method is a method of manufacturing a nonwoven fabric by melting and bonding low melting point fibers with low melting point synthetic fibers with heat and pressure. Since the composite fiber of the present invention has a low melting point function, a nonwoven fabric is used as a thermal bonding method. It would be desirable to prepare.

Non-woven fabric having an elastic recovery rate of the present invention can be produced a non-woven fabric having a low elastic recovery rate by minimizing the use of expensive 1,4-butanediol (1,4-Butanediol: 1,4-BD) with excellent elastic recovery power It has an effect.

In addition, the elastic polyester constituting the nonwoven fabric of the present invention has a melting point of 150 ~ 180 ℃ low melting point function does not require the addition of other low melting point yarn has the effect of easy production of nonwoven fabric.

1 is a cross-sectional view showing various embodiments of the side by side type of the elastic composite fiber of the present invention.
Fig. 2 is a cross-sectional view showing a sheath-core embodiment of the elastic composite fiber of the present invention.

Hereinafter, although the Example of the method for manufacturing the copolyester which has the elastic recovery rate of this invention is shown, it is not limited.

● Elastic polyester production

Examples 1-4

As shown in Table 1, the acid component of dimethyl terephthalate (DMT), dimethyl isophthalate (DMI) and ethylene glycol (EG), 1,4-butanediol (1,4-BD), polytetramethylene glycol (PTMG) Copolymer polyester having an elastic recovery rate of the present invention was prepared in a molar ratio of the diol component. As polytetramethylene glycol (PTMG), a molecular weight of 2,000 was used.

The acid component and the diol component are mixed at 220 ° C, esterified at 220-250 ° C for 2 hours and 40 minutes under 2.1-2.3 kgf / cm 2 pressure, and the esterification reaction of the esterification is performed under vacuum of 0.3 Torr or less. The polymerization was carried out at 250 ~ 283 ℃ to prepare a copolyester having a low elastic recovery in accordance with the present invention.

Titanium-based reaction catalysts were used in the esterification step and the polymerization step.

◎ Molar ratio of acid component and diol component of Examples 1 to 4

division DMT DMI EG 1,4-BD PTMG Example 1 0.7 0.3 0.9 0.05 0.05 Example 2 0.7 0.3 0.8 0.1 0.1 Example 3 0.75 0.25 0.9 0.05 0.05 Example 4 0.75 0.25 0.8 0.1 0.1

Examples 5-6

As shown in Table 2, the acid components of terephthalic acid (TPA) and isophthalic acid (IPA) and the diol components of ethylene glycol (EG), 1,4-butanediol (1,4-BD), and polytetramethylene glycol (PTMG) Copolymer polyester having an elastic recovery rate of the present invention was prepared in a molar ratio of. As polytetramethylene glycol (PTMG), a molecular weight of 2,000 was used.

The acid component and the diol component are mixed at 220 ° C, esterified at 240-260 ° C for 2 hours and 40 minutes under 2.1 to 2.3 kgf / cm 2 pressure, and the esterification reaction of the esterification is carried out in a vacuum of 0.3 Torr or less. Polymerization at 278 ~ 283 ℃ to prepare a copolyester having a low elastic recovery in accordance with the present invention.

Titanium-based reaction catalysts were used in the esterification step and the polymerization step.

◎ Molar ratio of the acid component and diol component of Examples 5 to 6

division TPA IPA EG 1,4-BD PTMG Example 5 0.7 0.3 0.9 0.05 0.05 Example 6 0.75 0.25 0.9 0.05 0.05

Melting point of the copolyester having an elastic recovery rate according to the present invention prepared above, the elastic recovery rate is measured in the following method and shown in Table 2.

Melting point was measured at 20 ℃ / min temperature increase rate using a differential scanning calorimeter (Pertain Elmer DSC-7).

Elasticity recovery rate using Instron, a sample of 2 mm thick and 10 cm long in the shape of a dumbbell, 200% elongation after 200% elongation at the rate of 5 seconds after the recovery at the same speed after the elongated length It measured and calculated | required by the following formula.

 Percent elastic recovery (%) = {[20- (L-10)] / 20]} x100

L: elongated length

division Melting point (캜) Elastic recovery rate (%) Example 1 157 52 Example 2 154 63 Example 3 164 58 Example 4 156 71 Example 5 150 50 Example 6 159 56

As shown in Table 3, the elastic polyester of the present invention can be seen that all of the Examples 1 to 6 have an excellent elastic recovery rate of more than 50%, the melting point has a low melting point function of 150 ~ 170 ℃ It may be used as binder fiber.

● Elastic composite fiber manufacturing

After the elastic polyester and polyethylene terephthalate (PET) of Examples 1 to 4 prepared above were spun into sheath-core composite fibers at a spinning speed of 1200 mpm at 240 to 260 ° C., 60 to 70 It extended | stretched by the draw ratio of 3.5 in the warm bath of ° C.

The stretched composite fiber was heat-treated at 70 to 75 ° C. to produce a composite fiber having an elastic recovery rate according to the present invention.

The intrinsic viscosity of the composite fiber was measured by a mixed solvent of phenol and tetrachloro ethane at 25 ℃.

The elastic recovery rate of the composite fiber is the position where the stress takes place upon re-expansion after returning to the original position at the same speed after leaving the specimen at 100 ° C. at 100 ° C. at 100 ° C. for 200 seconds at 100 mm / min for 5 seconds.

% Elastic recovery = {[20- (L-10)] / 20} x100 (%)

L: elongated length

division Elastic recovery rate (%) Radioactive Intrinsic viscosity Example 1 67 Good 1.27 Example 2 76 Good 1.45 Example 3 73 Good 1.38 Example 4 88 Good 1.43 Example 5 66 Good 1.31 Example 6 71 Good 1.40

As shown in Table 4, it can be seen that the elastic composite fibers of Examples 1 to 6 have good spinning properties and excellent elastic recovery rates of 60% or more.

● Elastic nonwoven fabric manufacturing

The elastic composite fiber prepared above was cut into 65 mm and mixed with 55 mm polyethylene terephthalate (PET) fiber by carding at a weight ratio of 1: 1 to obtain a web of 80 gsm (g / m 2), A nonwoven fabric having an elastic recovery rate of the present invention was prepared by a thermal bonding method of heat treatment at 180 ° C. for 10 minutes.

* Weight, tensile strength and tensile elongation were measured by JIS L1096 evaluation method.

* Elastic recovery rate measurement method

After the sample is left at the rate of 5 mm / min for 1 minute after stretching by Y%, the sample is recovered at the same rate and the elastic recovery rate is obtained from the distance of the load upon re-expansion.

: {[LoY- (L-Lo)] / LoY} x100 (%)

(L: Length at which stress starts to re-extend / Lo: Specimen length)

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Weight (gsm) 72 80 78 82 75 80 The tensile strength
(kg / 5cm) MD 105 115 110 120 110 115 CD 90 100 95 115 95 100 Elongation
(%) MD 70 80 75 85 75 80 CD 70 80 70 80 70 75 MD / CD (%) 1.17 1.15 1.16 1.04 1.16 1.15 Elastic recovery rate (%) 64 80 79 90 66 84

As shown in Table 5, in the elastic nonwoven fabric of the present invention, it can be seen that in Examples 1 to 6, the elastic recovery rate is superior to the elastic recovery rate of 60% or more.

The present invention described above is not limited to the above-described embodiments, and various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be obvious to him.

100: elastic polyester 200: general polyester

Claims (14)

Dimethyl terephthalate (DMT) and dimethyl isophthalate (DMI) or terephthalic acid (TPA) and isophthalic acid (IPA) as diacids. EG), 1,4-butanediol (1,4-Butanediol: 1,4-BD), polytetramethyleneglycol (PTMG) is made of an elastic polyester made of a diol component and a general polyester Nonwoven fabric having an elastic recovery rate, characterized in that it comprises an elastic composite fiber. The method of claim 1,
The nonwoven fabric is a non-woven fabric having an elastic recovery rate, characterized in that the elastic composite fiber of 40 ~ 80 mm and 50 ~ 90 mm general polyester short fibers. The method of claim 2,
The nonwoven fabric is a non-woven fabric having an elastic recovery rate, characterized in that the elastic composite fiber and the general polyester short fibers are mixed in a weight ratio of 30:70 ~ 70:30. The method of claim 1,
The nonwoven fabric is a non-woven fabric having an elastic recovery rate, characterized in that it is produced by a thermal bonding (Thermal bonding) method. The method of claim 1,
The elastic polyester is a non-woven fabric having an elastic recovery rate, characterized in that the acid component and the diol component is prepared by polymerization in a molar ratio of 0.9 to 1.1: 0.9 to 1.1. The method of claim 1,
The acid component of the elastic polyester is dimethyl terephthalate (DMT), dimethyl isophthalate (DMI) is a non-woven fabric having an elastic recovery rate, characterized in that the mixture is produced in a molar ratio of 0.65 ~ 0.80: 0.2 ~ 0.35. The method of claim 1,
The acid component of the elastic polyester is a non-woven fabric having an elastic recovery rate, characterized in that the terephthalic acid (TPA) and isophthalic acid (IPA) is prepared by mixing in a molar ratio of 0.65 ~ 0.80: 0.2 ~ 0.35. The method of claim 1,
The diol component of the elastic polyester is ethylene glycol (EG), 1,4-butanediol (1,4-BD), polytetramethylene glycol (PTMG) is mixed in a molar ratio of 0.7 ~ 0.9: 0.05 ~ 0.15: 0.05 ~ 0.15 Non-woven fabric having an elastic recovery rate, characterized in that it is produced. The method of claim 1,
Melting point of the elastic polyester is a non-woven fabric having an elastic recovery rate, characterized in that 150 ~ 180 ℃. The method of claim 1,
Non-woven fabric having an elastic recovery rate, characterized in that the elastic recovery rate of the elastic polyester is 50 ~ 80%. The method of claim 1,
The elastic polyester, dimethyl terephthalate (Dimethyl terephthalate (DMT) and dimethyl isophthalate (Dimethyl isophthalate (DMI)), terephthalic acid (Terephthalic acid (TPA) and isophthalic acid (Isophthalic Acid (IPA)) as an acid component (Diacid) Mixing a diol component with ethylene glycol (EG), 1,4-butanediol (1,4-Butanediol: 1,4-BD), and polytetramethylene glycol (PTMG);
An esterification step of esterifying the mixture at 220 to 270 ° C. for 2 to 4 hours at 2.0 to 2.5 kgf / cm 2 pressure;
Non-woven fabric having an elastic recovery rate characterized in that it comprises a polymerization step of polymerizing the ester reactant in a vacuum of 0.1 ~ 1 Torr or less at 250 ~ 295 ℃, 40 ~ 120 minutes. The method of claim 1,
The composite fiber is a non-woven fabric having an elastic recovery rate, characterized in that sheath-core (sheath-core) type or side by side (side by side) type. The method of claim 1,
The composite fiber is a non-woven fabric having an elastic recovery rate, characterized in that the elastic polyester and the general polyester is produced in a weight ratio of 40:60 ~ 60:40. The method of claim 1,
The elastic composite fiber, dimethyl terephthalate (Dimethyl terephthalate (DMT) and dimethyl isophthalate (Dimethyl isophthalate: DMI) or terephthalic acid (Terephthalic acid (TPA) and isophthalic acid (Isophthalic Acid: IPA) as an acid component (Diacid) Ethylene glycol (EG), 1,4-butanediol (1,4-Butanediol: 1,4-BD), polytetramethyleneglycol (PTMG) to the elastic polyester to prepare a diol component (Diol) Elastic polyester polymerization process to manufacture;
Spinning the elastic polyester and the general polyester into a sheath-core or side by side fibers at a spinning speed of 800 to 2000mpm at 230 to 290 ° C;
An extending process of stretching the spun fiber at a stretching ratio of 1.5 to 4.5 at 40 to 100 ° C;
Non-woven fabric having an elastic recovery rate, characterized in that it comprises a heat treatment process for heat-treating the stretched fiber at 40 ~ 90 ℃.

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