KR20180062021A - Spunbonded Adhesive Nonwoven Fabric Using A Polyester-Based Resin With Excellent Breathability - Google Patents

Abstract

The present invention relates to a spunbonded nonwoven fabric and, more specifically, to a polyester-based spunbonded elastic nonwoven fabric, in which diol and dicarbonic acid, which are hard segment raw materials, are esterified, polyol, which is a soft segment raw material, is condensation-polymerized in a reactant thereof, and a polyester-based elastic adhesive resin composition to which 0.2-3 ppm of an inorganic additive is added to accelerate the solidification rate, is spun to form a polyester-based spunbonded elastic nonwoven fabric through a spun-bonding process, wherein the diol is composed of 1,4-butanediol (1,4-BD) or a mixture of 1,4-butanediol (1,4-BD) and 1,6-hexanediol (1,6-HD), the dicarbonic acid may be composed of terephthalic acid (TPA) or a mixture of terephthalic acid (TPA) and isophthalic acid (IPA), the terephthalic acid (TPA) and the isophthalic acid (IPA) including respective derivatives, and the polyol may be composed of any one of poly(tetramethylene ether) glycol (PTMG), polyethylene glycol (PEG) and polypropylene glycol (PPG).

Description

[0002] Spunbonded Adhesive Nonwoven Fabric Using A Polyester-Based Resin With Excellent Breathability [

The present invention relates to a process for producing a spunbond-bonded nonwoven fabric using a polyester-based hot-melt adhesive resin, and more particularly to a process for producing a spunbond- Based spun-bonded nonwoven fabric.

BACKGROUND ART Conventionally, nonwoven fabrics have been used in a wide range of fields such as absorbent articles such as disposable diapers and sanitary napkins, cleaning articles such as wipers, medical supplies such as masks, and the like. As described above, the nonwoven fabric is used in various other fields, but when it is actually used in products of various fields, it is necessary to manufacture the nonwoven fabric so as to have a property or structure suitable for the use of each product.

Among them, the nonwoven fabric which requires adhesion characteristics is made of heat-bondable conjugate fiber which can be formed by thermal fusion using thermal energy such as hot air or heating roll as in Korean Patent No. 1473284, ), Which is used for sanitary materials such as diapers, napkins, pads, and the like, or industrial materials such as daily necessities and filters, but is not suitable for applications requiring adhesion without requiring bulkability .

In the application requiring adhesion, a thermal adhesive film, which is a thermal adhesive material in a film form, is mainly used. In the case of a heat adhesive film, a polymer film made of polyester as a main material is used as in Korean Patent No. 1473284, And other materials. However, it has a drawback that it can not be applied to applications requiring air permeability due to inherent characteristics of the film.

In order to improve the disadvantages of such a thermal adhesive film, attempts have been made to manufacture a nonwoven fabric using a low melting point material.

Korean Patent No. 0702537 discloses a method for producing a core-sheath type polyester long-fiber nonwoven fabric using a polyester having a high melting point as a core component and a polyester having a low melting point as a secondary component. However, It is necessary to use a nonwoven fabric having a high basis weight to obtain a desired adhesive strength.

In addition, China Patent No. CN10120148 proposes a method of producing a nonwoven fabric having a breathable property by producing a net film using a low melting point polyester. Thus, the thickness of the yarn forming the net film is too thick, There is a problem that the adhesive force is varied and the thick part spreads widely after bonding to form a thin film, which causes a problem in that the air permeability is lowered.

Accordingly, there is a demand for development of an adhesive material having excellent air permeability by improving the above problems.

In order to solve the above problems, it is an object of the present invention to provide a polyester-based bonded nonwoven fabric which is excellent in flexibility and air permeability and can be adhered at a low temperature by using a polyester-based elastic adhesive resin having a low-

Another object of the present invention is to provide an adhesive nonwoven fabric produced by low temperature welding using a spunbond spinning technique.

In order to accomplish the above object, the present invention provides a spunbonded nonwoven fabric comprising an esterification reaction of a diol (diol) and a dicarbonic acid as a raw material of a hard segment, and adding a polyol, which is a raw material of a soft segment, (1,4-BD) or 1,4-butanediol (1,4-BD) and 1,6-hexanediol (1,6-HD) The dicarbonic acid may be composed of a terephthalic acid (TPA) or a mixture of terephthalic acid (TPA) and isophthalic acid (IPA), and the terephthalic acid (TPA) TPA) and isophthalic acid (IPA) may include derivatives thereof, and the polyol may be any one of poly (tetramethylene ether) glycol (PTMG), polyethylene glycol (PEG) and polypropylene glycol Lt; / RTI >

The present invention also provides a polyester-based spunbond elastic nonwoven fabric formed by spunbonding a polyester elastomeric adhesive resin composition containing 0.2 to 3 ppm of an inorganic additive added thereto in order to accelerate a solidification rate.

The present invention also provides a polyester spunbond elastic nonwoven fabric characterized by comprising 1 to 70% by weight of the polyol, and 30 to 99% by weight of a diol and a dicarbonic acid.

The polyester-based adhesive resin of the present invention is preferably a polyester-based spunbond elasticity having a hardness of 40 to 80 D, a melting temperature (Tm) of 70 to 150 ° C. and an intrinsic viscosity (IV) of 0.4 to 2.0 Thereby providing a nonwoven fabric.

The present invention also provides a polyester-based spunbond elastic nonwoven fabric characterized in that the inorganic additive is produced in a master batch form together with a polyester-based elastic adhesive resin and can be used for spunbond spinning.

The present invention relates to a polyester-based elastic adhesive resin composition having a low melting point by using terephthalic acid (TPA) as a dicarbonic acid component or isophthalic acid (IPA) as an additive to the terephthalic acid (TPA) To produce a polyester-based elastic nonwoven fabric, and has an excellent effect in terms of adhesion and reduction of original feeling.

 In addition, the present invention relates to a polyester-based elastic adhesive resin composition having a low melting point by adding 1,6-hexanediol (1,6-HD) in addition to 1,4-butanediol (1,4- The crystallization speed is increased and the speed of solidification during spinning of the spunbond is accelerated, thereby achieving a stable spunbond process.

The present invention also relates to a method for producing a polyester elastomeric adhesive resin, which comprises adding an inorganic additive in polymerization of a polyester elastomeric adhesive resin, or adding a master batch containing an inorganic additive to a polyester elastomeric adhesive resin during spunbond spinning, So that a stable spunbond process can be achieved.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a conceptual diagram of a spunbond spinning apparatus for producing a polyester-based elastic bonding nonwoven fabric according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, 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 the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as to avoid obscuring the subject matter of the present invention.

As used herein, the terms "substantially", "substantially", and the like are used herein to refer to a value in or near the numerical value when presenting manufacturing and material tolerances inherent in the meanings mentioned, Absolute numbers are used to prevent unauthorized exploitation by unauthorized intruders of the mentioned disclosure.

The present invention relates to a spunbonded nonwoven fabric prepared by using a thermoplastic polyester elastomeric adhesive composition, wherein the polyester elastomeric adhesive resin composition is obtained by esterifying diol (diol) and dicarbonic acid (raw material for hard segment) And condensation polymerization of a polyol, which is a raw material of a soft segment, with the reaction product, and condensation polymerization of the reaction product with a polymerization catalyst, a stabilizer, etc., and adding at least one inorganic additive such as carbon, silica and titanium dioxide to the elastic bonding resin 0.2 to 3 ppm by weight of the non-woven fabric is added to the non-woven fabric.

 The diol is composed of a mixture of 1,4-butanediol (1,4-BD) or 1,4-butanediol (1,4-BD) and 1,6-hexanediol (1,6-HD) Can,

The dicarbonic acid may be composed of a mixture of terephthalic acid (TPA), terephthalic acid (TPA) and isophthalic acid (IPA)

The terephthalic acid (TPA) and the isophthalic acid (IPA) may include respective derivatives,

The polyol may be prepared by spinning a polyester elastomeric adhesive composition which may be composed of poly (tetramethylene ether) glycol (PTMG), polyethylene glycol (PEG) and polypropylene glycol (PPG) Based spunbond elastic nonwoven fabric.

The inorganic additive acts to speed up the solidification speed of the polyester elastomeric adhesive resin composition when spinning, and may be manufactured in a master batch form together with a polyester elastomeric adhesive resin and used for spunbond spinning.

The esterification reaction can be prepared by two methods. First, a mixture of dimethyl terephthalate (DMT), a dicarbonic acid, or a mixture of dimethyl terephthalate (DMT) and dimethyl isophthalate (DMI) A mixture of 1,4-butanediol (1,4-BD) or 1,4-butanediol (1,4-BD) and 1,6-hexanediol (1,6-HD) And an ester exchange method (DMT method)

Also, 1,4-butanediol (1,4-BD), which is a mixture of terephthalic acid (TPA) or terephthalic acid (TPA) and isophthalic acid (IPA) and diol, which is a dicarbonic acid, , Ethylene glycol (EG) by reaction with a mixture of 1,4-butanediol (1,4-BD) and 1,6-hexanediol (1,6-HD) and soft segment polyol There is a method of synthesizing a condensation product of low molecular weight by a direct esterification method (TPA method) by reaction and melt-condensation polymerization while removing the diol to increase the molecular chain length.

The direct esterification method (TPA method) of the present invention is a method in which 1,4-butanediol (1,4-BD) or 1,4-butanediol (1,4-BD) and 1,6- Diol (1,6-HD) mixture,

The dicarbonic acid may be composed of terephthalic acid (TPA) or terephthalic acid (TPA) and isophthalic acid (IPA)

The polyol may be composed of any one of poly (tetramethylene ether) glycol (PTMG), polyethylene glycol (PEG), and polypropylene glycol (PPG).

1 to 70% by weight of the polyol, and 30 to 99% by weight of a diol and a dicarbonic acid.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a conceptual diagram of a spunbond spinning apparatus 100 for producing a polyester elastic nonwoven fabric according to the present invention. FIG. The nonwoven fabric process using the spunbond spinning apparatus 100 includes a process of directly spinning the polymer into continuous filaments, a process of forming a web by laminating and laminating the fibers, a bonding process of improving the bonding between the fibers and stabilizing the shape . A thermoplastic resin such as nylon, polyester, or polypropylene can be used as the raw material used in this step.

In the spinning process, the polymer is melted to have a constant viscosity in the emitter, and then supplied through the inlet 110. The present invention employs a resin having a hardness of 40 to 80D, a melting temperature (Tm) of 70 to 150 DEG C and an intrinsic viscosity (IV) of 0.4 to 2.0, using a polyester elastic bonding resin.

And then through the spinneret through the filter device of the emitter 120 to emit continuous filaments. The spun filaments are transferred to the cooling chamber, and as the filaments pass through the chamber, the cold spirals flow into the filaments and the melted filaments solidify. In the spunbonded nonwoven fabric, the filaments are drawn and cooled by a single process because unlike the high-temperature method used for typical fiber spinning, a high-speed air stream is supplied parallel to filaments to stretch individual filaments.

The filament fibers that have been radiated thereafter are accumulated in the net conveyor 130 and then first pressed by a nip roller 140, and then subjected to secondary pressing at a temperature of 150 ° C on a roll 150 of a cylinder 150. After the connecting property of the nonwoven fabric is imparted by the pressing, the nonwoven fabric is wound around the take-up machine 160 to produce a long-spun spunbond nonwoven fabric.

 The properties of the spunbond nonwoven fabric can be largely divided into high expansion and low expansion. The criterion can be classified according to the hardness (D) of the polyester-based elastic bonding resin which is a raw material of long fibers. Shore hardness (Shore D) can be used according to the measurement method as a standard for sorting the elastic body. The higher the number, the higher the hardness and the harder the object. The elastic stretch nonwoven fabric has a hardness of 30 to 40 (D) and the low stretch nonwoven fabric has a hardness of 50 to 70 (D).

Further, the elastic nonwoven fabric can be divided into one-direction stretching nonwoven fabric or two-direction stretching nonwoven fabric depending on the stretching direction. 1 direction means stretching only in the same direction as the running direction of the produced nonwoven fabric, and 2 direction means stretching not only in the same direction as the running direction but also in the vertical direction.

The directionality is determined by the ratio of the nip roller 140 and the carrier 150. In the two-direction stretching property, the nip rollers and the carrier ratios rotate at a ratio of 0.9: 1 to 1.1: 1. On the other hand, in order to have the one-directional stretchability, the nip rollers 140 and the carender 150 should have a speed ratio of 1.7 to 3.3. As the calender rotation speed is relatively large, the effect of artificially pulling in the direction of travel is established, and the long fibers of the nonwoven fabric are fixed in the pulling direction and fixed. Therefore, the nonwoven fabric having already been fixed in the already stretched state can not be reduced in the same direction, but the stretch ratio is increased in the vertical direction.

On the other hand, the two-direction stretchable nonwoven fabric is not artificially pulled in the traveling direction, so it is fixed on the net conveyor 130 in an integrated state, and the stretching ratio is generated in the traveling direction and the vertical direction.

The highly stretchable two-way stretchable nonwoven fabric of the present invention has a running direction stretching ratio (MD) of 15 to 100% and a vertical stretching ratio (CD) of 50 to 120%

The running direction stretching ratio (MD) of the highly stretch unidirectionally stretchable nonwoven fabric is characterized by being 1/6 to 1/7 times as high as the high elongation and contraction vertical direction (CD). In the direction of travel, it can be seen that the extensibility of the extruded filament is much lower than that of the vertical direction as a result of the crimping under the condition that the filament is already stretched.

On the other hand, the vertical stretching ratio (MD) of the highly stretched unidirectional stretchable nonwoven fabric is 1.2 to 1.7 times the vertical stretching ratio (CD) of the highly stretchable two-direction stretchable nonwoven fabric, You can see that it is better. This is because when the same hardness (35D) is used, the two-direction stretchable nonwoven fabric can be stretched in both directions, resulting in a dispersion effect of stretching.

As a whole, the stretching ratio (MD, CD) of the low stretching two-direction stretching nonwoven fabric is one-fifth to one-half of that of the high stretching two-direction stretching nonwoven fabric (MD, CD) Able to know. This is due to the difference in hardness of the polyester-based elastic adhesive resin of the filaments constituting the nonwoven fabric. The larger the hardness value (D), the greater the hardness and the lower the softness. That is, the polymer constituting the resin is more firmly bonded It is difficult to change the shape by external force.

The features and other advantages of the present invention as described above will become more apparent from the following examples, which should not be construed as limiting or limiting the scope of protection of the present invention, .

Example  One

A polyester-based elastic bonding resin having a hardness of 40 D, a melting temperature (Tm) of 120 캜 and an intrinsic viscosity (IV) of 1.05 in a conventional spunbonding spinning apparatus 100 having the structure shown in Fig. 0.5ppm of the inorganic additive are added thereto and spunbond spinning is carried out at a temperature of the extruder at 210 ° C.

The soft segment of the polyester-based elastomer resin used was polytetramethylene glycol, and the spinning temperature of the spinner 120 was 210 ° C. Other gearing conditions are 11 rpm for gear pump, 600 rpm for QS air volume, and 650 rpm for suction. The filament fibers radiated through the spinneret are adhered to a moving net bonder 130. The filament fibers are first squeezed at a speed of 11 m per minute at a nip roller 140, Min. At a temperature of 150 ° C to give the spunbonded nonwoven fabric the aggregate property, and then wound at a speed of 11 m / min to the take-up device 160 to produce a long-fiber-bonded spunbond nonwoven fabric.

 Tensile strength, elongation at break, air permeability, elongation percentage and recovery rate of the spunbonded nonwoven fabric thus manufactured were analyzed by the above analysis method, and the results are shown in Table 1.

Example  2 to 4

The intrinsic viscosity (IV) and the inorganic additive were added in the spinning under the same spinning conditions as in Example 1, and the conditions of the gear pump and the spinning speed were varied during spinning.

 Tensile strength, elongation at break, air permeability, elongation percentage and recovery rate of the spunbonded nonwoven fabric thus manufactured were analyzed by the above analysis method, and the results are shown in Table 1.

Comparative Example  1,2

Comparative Example 1 relates to a nonwoven fabric prepared by spunbonding a general polypropylene (PP) in the spinning conditions of Table 1, and Comparative Example 2 relates to a spinning nonwoven fabric using a general polyester resin.

? Intrinsic viscosity IV: ASTM D 460386

◎ Tm, Tg: DSC analysis (KS K0328)

◎ Tensile strength: ASTM D638 (Tensile strength is measured by cutting nonwoven fabric 1 inch wide and 15 cm long)

◎ Elongation at break: ASTM D638 (Measuring elongation at break by cutting nonwoven fabric 1 inch wide and 15 cm long)

◎ Basis weight: The nonwoven fabric was cut into a size of 100 cm2, and the weight was measured. Then, the weight was measured by multiplying 100 by weight.

◎ Flexibility

    - Analysis method of stretch ratio: After stretching the nonwoven fabric 1 inch wide and 15 cm long, fixing one end and hanging 1 kg weight on the other side, the elongation percentage is analyzed.

       Expansion factor calculation formula = ((extended length) / (initial length)) × 100

  (MD, Machine Direction and Cross Dirction) according to the arrangement of the nonwoven fabric.

◎ Recovery rate

   - Analysis of recovery rate: The nonwoven fabric was cut into 1 inch wide and 15 cm long. Fixed one end of the nonwoven fabric was fixed with 1 kg weight on the other side. After 10 minutes, the weight was removed. And the recovery rate was analyzed.

    Recovery Rate Formula = Restored Length / Stretched Length when Stressed × 100

 (MD, Machine Direction and Cross Dirction) according to the arrangement of the nonwoven fabric.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Nonwoven fabric type Adhesive nonwoven General nonwoven fabric
Polymer
Material Low melting point TPEE PP PET Hardness
(Shore D) 42 60 100 Tm (占 폚) 120 115 105 90 122 255 IV 1.05 1.0 1.0 1.0 - 0.65 additive Kinds carbon carbon TiO2 Silica Content (ppm) 0.5 2 2 2



radiation

Ext. Temperature
(° C) 210 210 210 210 230 290 Temperature rise
(° C) 210 210 210 210 210 290 Gear pump
(rpm) 15 18 12 13 27 27 QS air volume
(rpm) 600 600 600 600 400 400 Suction
(rpm) 650 650 650 650 350 350 Coiling Bore (m / min) 15 18 12 13 24 15


Nonwoven fabric properties
Basis weight (gsm) 22 22 22 22 55 185 The tensile strength
(MD / CD) 0.8 /
0.8 0.8 / 0.6 0.7 / 0.8 0.6
/0.5 1.4 / 1.0 27.5 / 19.0 Elongation at break
(MD / CD) 140 /
146 140/147 140/135 146 /
147 54/65 67.6 / 101.2 Breathability
(m / s) 3.1 3.1 3.1 3.1 3 3 flexibility tenderness tenderness tenderness tenderness Stiffness Stiffness Adhesion 100 ℃ 0 0 1.0 4.2 0 0 120 DEG C 2.1 4.5 5.2 5.4 0 0 140 ° C 5.0 5.2 5.3 5.2 0 0

※ TPEE: Polyester Isoleester (Polyester elastic adhesive resin)

As can be seen from the results of Table 1, the nonwoven fabric was prepared using the adhesive resin in the Examples, and the nonwoven fabric was produced in the Comparative Example using the conventional resin. In the case of Examples, it was confirmed that the adhesive strength was superior to that of a general substrate, and in Comparative Example using a general resin, adhesion was not observed.

Further, in the examples, it was confirmed that the breathability of parts bonded by using the adhesive nonwoven fabric of the present invention was maintained at the same level as the breathability of the nonwoven fabric using a general resin, even after bonding.

In addition, it was confirmed that the embodiment of the present invention accelerates the solidification rate in the case where an inorganic additive is used, thereby increasing the spinning discharge amount and the production rate.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

100: spunbond radiation facility 110: inlet
120: radiator 130: net conveyor
140: Nip Roller 150: Calender Roller)
160: Winder

Claims (4)

In the spunbond nonwoven fabric,
Diol and dicarbonic acid, which are raw materials of hard segment, are esterified and polycondensation of polyol, which is a raw material of soft segment,
The diol may be 1,4-butanediol (1,4-BD)
1,4-butanediol (1,4-BD) and 1,6-hexanediol (1,6-HD)
The dicarbonic acid may be a terephthalic acid (TPA)
Terephthalic acid (TPA) and isophthalic acid (IPA) mixtures,
The terephthalic acid (TPA) and the isophthalic acid (IPA) may include respective derivatives,
The polyol may be composed of any one of poly (tetramethylene ether) glycol (PTMG), polyethylene glycol (PEG), and polypropylene glycol (PPG), and may be one of carbon, silica, and titanium dioxide A polyester-based spunbond elastic nonwoven fabric formed by spunbonding a polyester-based elastic bonding resin composition comprising 0.2 to 3 ppm of at least one inorganic additive added thereto.
The method of claim 1,
Characterized in that it comprises 1 to 70% by weight of the polyol and 30 to 99% by weight of a diol and a dicarbonic acid.
The method of claim 1,
The polyester-based spun-bonded elastic nonwoven fabric is characterized in that the polyester-based adhesive resin has a hardness of 40 to 80 D, a melting temperature (Tm) of 60 to 150 캜, and an intrinsic viscosity (IV) of 0.4 to 2.0.
The method of claim 1,
Wherein the inorganic additive is produced in a master batch form together with a polyester based elastic adhesive resin and can be used for spunbond spinning.

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