KR20210017688A - Polyester nonwoven fabrics having high strength and method for producing using the same - Google Patents

Abstract

The present invention relates to a high-strength polyester non-woven fabric and a method for producing the same. According to the present invention, a high melting point polyester chip obtained by recycling waste is applied as a first filament so as to improve the strength of filaments constituting the non-woven fabric, and a copolyester having a low melting point in a specific range is applied as a second filament so as to control adhesive force between filaments, thereby achieving a reduction in production costs of raw materials, and obtaining a polyester non-woven fabric which exhibits high strength, prevents the passage of fine grain soil, facilities the passage of pore water, and can be applicable as a filter medium for a civil drainage material with excellent mechanical properties when a product is being poured.

Description

High-strength polyester nonwoven fabric and its manufacturing method {POLYESTER NONWOVEN FABRICS HAVING HIGH STRENGTH AND METHOD FOR PRODUCING USING THE SAME}

The present invention relates to a high-strength polyester nonwoven fabric suitable for use as a civil drainage material and a method of manufacturing the same.

Civil engineering drainage material is used for the purpose of reinforcing the soft ground containing pore water such as groundwater, and various construction methods such as sand drain and pack drain are applied to the site. Among them, the vertical drainage method (PVD, Prefabricated Vertical Drain), which has fast construction speed, easy construction management, and low construction cost, is widely used.

The civil engineering drainage material used in the vertical drainage method is composed of a polypropylene (PP) core material and a filter material that maintains shape and functions to drain pores. At this time, the role of the filter material is to prevent the passage of fine particles and to pass pore water without interruption or clogging of drainage, and nonwoven fabrics or fabrics are used.

Since the drainage material is buried within the ground to a depth of several to tens of meters, durability to withstand damage due to friction between clay and fine soil particles and filter material during the burial process and mechanical properties for external tension are required.

For the filter material, mainly two types of nonwoven fabrics consisting of polyethylene terephthalate and polypropylene raw materials are mainly used.Polypropylene nonwoven fabrics have a relatively low cost and specific gravity compared to polyethylene terephthalate nonwoven fabrics. It has a high market share due to its excellent physical properties.

The required properties of the nonwoven fabric used as a filter material include tensile strength, tearing strength, effective pore size (AOS), and permeability, and each property according to the site where the drainage material is placed. This is required differently. In particular, in order to prevent the risk of tearing and cutting of the nonwoven fabric while pouring the drainage material into the ground, tensile strength of 500N or more, tear strength in the range of 100~300N, water permeability of 0.01cm/s or more, and 75~100㎛ or less for filter function It must be a non-woven fabric having the physical properties of the effective pore size (AOS) of

However, according to a recent issue, as the non-woven fabric filter is torn in the process of removing the poured drainage material, the problem remaining in the ground is highlighted, and high-strength non-woven fabric with a tensile strength of 700N or more, tearing strength of 300N or more, and AOS 75㎛ or less. Filter material is required.

To this end, there is a nonwoven fabric made of polyethylene terephthalate chips for spinning having a typical intrinsic viscosity (IV) of 0.6 to 0.7 dl/g, and the nonwoven fabric exhibits excellent drape properties and moldability, but the tear strength against tearing is polypropylene. It has a lower disadvantage compared to the product.

Accordingly, in order to manufacture a high-strength polyethylene terephthalate nonwoven fabric having higher mechanical properties, there is a need for a nonwoven fabric manufacturing technology that improves the strength of the filaments constituting the nonwoven fabric and controls adhesion between filaments.

In general, as a method of improving the mechanical properties of polyethylene terephthalate nonwoven fabric, high-viscosity (IV) polyethylene terephthalate chips are applied as a matrix raw material to increase the strength of the filament, or the content of the binder raw material and There is a technology to increase the bonding force between filaments by controlling the adhesion temperature.

At this time, when reforming a low-viscosity (IV) chip into a high-viscosity (IV) chip, a solid-state polymerization (SSP) process is essential. However, the solid-phase polymerization has a disadvantage that the process speed is slow and the cost increases due to the occurrence of the process cost. Accordingly, the cost increase due to solid-phase polymerization through the application of'post-industrial recycled (PIR)' polyethylene terephthalate chips sold at relatively low prices by recycling the waste of polyethylene terephthalate nonwoven fabric. You can see the effect of solving the problem.

However, the use of recycled polyethylene terephthalate chips should be aware of problems such as degradation in properties (eg, chip agglomeration, poor spinnability, and filament strength) due to differences in chemical composition due to additives and adhesives contained in nonwoven waste.

An object of the present invention is to reduce the process cost by using material recycled polyester as a raw material, which is provided by recycling wastes of the manufacturing process of polyester nonwoven fabric, and at the same time, through controlling the viscosity and content of the raw material, tensile strength and tear strength than before. It is to provide this improved high-strength polyester nonwoven fabric and a method of manufacturing the same.

Another object of the present invention is to prevent the passage of clay and fine soil particles while facilitating the passage of pore water, and exhibit excellent mechanical properties when placing products, so that it can be applied in the field of civil engineering or as a filter material in various fields. It is to provide a strong polyester nonwoven fabric and a manufacturing method thereof.

In the present specification, the first filament which is recycled polyester having a melting point of 255°C or higher; And a second filament, which is a copolyester having a melting point of 160° C. or more and 180° C. or less, and is a spunbond nonwoven fabric to which a nonwoven web is bonded,

The content of the first filament is 80 to 90% by weight, the content of the second filament is 10 to 20% by weight,

The first filament is a matrix filament, and the second filament is a binder filament. It provides a high-strength polyester nonwoven fabric.

In the present specification, the steps of blending a first filament, which is a recycled polyester having a melting point of 255°C or higher, and a second filament, which is a copolyester having a melting point of 160°C or higher to 180°C, and forming a nonwoven web; And

Including; applying the nonwoven web to a calender process and a hot air process to prepare a spunbond nonwoven fabric in which the first filaments and the second filaments are laminated and bonded in a web form; and

The content of the first filament is 80 to 90% by weight, and the content of the second filament is 10 to 20% by weight,

It provides a method of manufacturing the polyester nonwoven fabric.

Hereinafter, a polyester nonwoven fabric having high strength and a method of manufacturing the same according to embodiments of the present invention will be described in detail.

Prior to that, unless expressly stated in the specification, terminology is only intended to refer to specific embodiments and is not intended to limit the invention.

The singular forms used in the present specification also include plural forms unless the phrases clearly indicate the opposite.

The meaning of'comprising' as used herein specifies a specific characteristic, region, integer, step, action, element and/or component, and other specific characteristic, region, integer, step, action, element, component and/or group It does not exclude the existence or addition of

In addition, in the present specification, terms including ordinal numbers such as'first' and'second' are used for the purpose of distinguishing one component from other components, and are not limited by the ordinal number. For example, within the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

(Polyester nonwoven fabric)

According to an embodiment of the present invention, the first filament% which is recycled polyester having a melting point of 255° C. or higher; And a second filament which is a copolyester having a melting point of 160° C. or more to 180° C. or less; and a spunbond nonwoven fabric to which a nonwoven web is bonded, and the content of the first filament is 80 to 90% by weight, and the first 2 The content of the filament is 10 to 20% by weight, the first filament is a matrix filament, and the second filament is a binder filament, characterized in that, a high strength polyester nonwoven fabric may be provided.

That is, the present invention uses the raw material of the first filament to recycle polyester, which is sold relatively inexpensively by recycling wastes of the polyester nonwoven fabric manufacturing process as a matrix filament, thereby reducing cost and particularly applicable to nonwoven fabrics for civil engineering drainage materials. By having tensile, tearing strength, and pore size, it is possible to provide a high-strength polyester nonwoven fabric for drainage materials having excellent filter performance and high mechanical strength. For example, the polyester nonwoven fabric can be used as a filter for civil engineering drainage materials.

In addition, the second filament is a copolyester having a relatively low melting point than that of the first filament, as a binder filament, so that when spun together with the first filament as a matrix filament, the bonding force between the filaments can be controlled, and spinnability and It can also contribute to the improvement of tear strength.

Therefore, when the weight per unit area of the polyester nonwoven fabric provided in the present invention is 145 g/m2, the tensile strength is 700N or more, the tear strength is 300N or more, the effective pore size (AOS) is 75㎛ or less, and the water permeability coefficient All properties of 1.0×10 ^-2 cm/s or more can be satisfied.

In addition, the polyester nonwoven fabric of the present invention satisfies the above-described range of properties, thereby improving mechanical properties such as tensile strength and tearing strength, as well as having a small effective pore size and excellent filter effect. Accordingly, it is possible to improve the discharge of pore water, suppress the passage of clay and fine soil particles, and reduce clogging due to the porous structure. Therefore, the polyester nonwoven fabric of the present invention can be applied as a filter material for civil engineering drainage materials without tearing, and can also be usefully used as a filter material for other uses.

On the other hand, the first filament is a polyester copolymer recycled from the waste of the polyester nonwoven fabric manufacturing process, and industrial material recycling (Post-Industrial Recycled; PIR) polyethylene terephthalate, consumer material recycling (Post-Consumer Recycled: PCR) Polyethylene terephthalate or mixtures thereof. The intrinsic viscosity (IV) of the first filament, which is a recycled polyester, may be 0.60 to 0.90 dl/g or 0.70 to 0.85 dl/g. Further, as an example of the melting point of the first filament, it may be 255°C to 280°C while having the intrinsic viscosity.

Preferably, the first filament may include a post-industrial recycled (PIR) polyethylene terephthalate having an intrinsic viscosity (IV) of 0.60 to 0.90 dl/g and a melting point of 255° C. or higher.

The first filament may include adipic acid (AA), isophthalic acid (IPA), neopentyl glycol (NPG), or a polyester-based copolymer of a mixture thereof, depending on the use of the recycled material.

In addition, the first filament may have an average fineness of 3 to 9 denier, and the second filament may have an average fineness of 1 to 5 denier.

The first filament has a strength of 3.8 to 5 gf/Denier, and an elongation (strain) of 50 to 100%.

The raw material of the second filament may include adipic acid (AA), isophthalic acid (IPA), neopentyl glycol (NPG), or a copolymer of a mixture thereof, and having a melting point of 160° C. or more to 180° C. It is characterized. When the melting point of the copolyester used in the second filament is 160° C. or less, the crystallinity is low and spinnability is poor, and in the case of 180° C. or more, the tear strength decreases as the adhesion temperature increases.

In addition, the polyester nonwoven fabric provided in the present invention may have a thickness of 0.38 mm to 0.41 mm and a density of 0.35 g/cm 3 to 0.38 g/cm 3 when the weight per unit area is 145 g/m 2. However, the thickness may be different in the denier or binder content of the first and second filaments provided in the present invention, and at the same time, the density may also vary.

(Method for producing polyester nonwoven fabric)

On the other hand, a method of manufacturing the polyester nonwoven fabric of the present invention having the above-described physical properties will be described.

According to another embodiment of the present invention, the first filament, which is a recycled polyester having a melting point of 255° C. or higher, and a second filament, which is a copolyester having a melting point of 160° C. or higher to 180° C., is mixed-spun to form a nonwoven web. step; And applying the nonwoven web to a calender process and a hot air process to prepare a spunbond nonwoven fabric in which the first filaments and the second filaments are laminated and bonded in a web form; including, wherein the content of the first filaments is 80 to 90 % By weight, and the content of the second filament may be provided in a method of manufacturing the polyester nonwoven fabric of 10 to 20% by weight.

According to the present invention, 1) performing the step of improving the filament strength by controlling the intrinsic viscosity (IV) of recycled polyester such as 1) post-industrial recycled (PIR)' polyethylene terephthalate chip, and 2) It may include controlling the content of the low melting point copolyester serving as a binder between filaments.

In particular, according to the method of manufacturing a polyester nonwoven fabric of the present invention, the high strength characteristics described above are characterized by manufacturing different amounts of the first filament and the second filament spun in order to express the mechanical properties of the polyester nonwoven fabric. Can all be satisfied.

Specifically, in the step of forming the nonwoven web, a first filament, which is a recycled filament having a melting point of 255°C or higher, and a second filament, which is a copolyester, having a melting point of 255°C or higher and 160°C to 180°C, are respectively added to a continuous extruder to melt, and then the above-described It includes the step of honseoin spinning so that the content ratio and opening by a conventional method.

In addition, the content ratio of the first filament and the second filament is preferably prepared in the form of a mixed fiber (Matrix & Binder) consisting of 80 to 90% by weight: 10 to 20% by weight. At this time, the content ratio of the first filament and the second filament may be controlled by controlling the amount of molten polymer discharged or by changing the design of the detention.

When the content of the second filament is less than 10% by weight, the nonwoven web is not sufficiently bonded to form a filament on the surface, indicating instability of mechanical properties. In addition, when the content exceeds 20% by weight, defects in opening occur due to entanglement between the filaments during spinning, and the nonwoven fabric becomes stiff, which is not preferable for manufacturing a nonwoven fabric. Therefore, in order to manufacture a polyester nonwoven fabric having high strength, it is very important to control the content ratio of the first filament and the second filament within the above-described range.

Preferably, the content of the first filament is 80 to 90% by weight of the total nonwoven fabric of the polyethylene terephthalate filament having a melting point of 255°C or higher, and the content of the second filament is a copolyester filament having a melting point of 160°C or higher to 180°C or lower. A step of forming a web in the form of a mixed fiber (Matrix & Binder) of the two kinds of filaments so as to be 10 to 20% by weight of the total nonwoven fabric is performed.

At this time, as described above, the first filament is a chip-type industrial material recycled (Post-Industrial Recycled; PIR) polyethylene terephthalate, consumer material recycled (Post-Consumer Recycled: PCR) It may be a polyester copolymer comprising polyethylene terephthalate or a mixture thereof. In addition, the above materials can be used by purchasing a regenerated polyester copolymer by a method well known in the art.

In addition, the second filament is a copoly having a melting point of 160° C. or more and 180° C. or less, including adipic acid (AA), isophthalic acid (IPA), neopentyl glycol (NPG), or a copolymer of a mixture thereof. Esters can be used. However, the monomer constituting the copolyester is not limited to the above type, and as long as it can provide a polyester copolymer having the specific melting point range, it may be selected and used without limitation.

In the step of honseom spinning, it is preferable that the first filament has an average fineness of 3 to 9 denier, and the second filament has an average fineness of 1 to 5 denier. The average fineness of the first and second filaments may be performed by adjusting the discharge amount and the number of capillaries of the spinneret. If the first filament has a fineness of 3 denier or less, the strength of the filament is lowered, resulting in insufficient strength of the nonwoven fabric. If the first filament exceeds 9 denier, the size of the inter-filament gap increases, resulting in poor filtration performance. In addition, when the fineness of the second filament is 1 denier or less, there is a problem in that the filament formation is poor, and when the fineness of the second filament exceeds 5 denier, there is a problem that the filament is insufficiently cooled and the opening shape is poor.

The filaments spun in the form of honseom spinning can be sufficiently stretched so that the spinning speed is 4,500 to 5,500 m/min using a high-pressure air stretching device, so that filament fibers having a fineness of 3 to 10 denier can be prepared.

Meanwhile, the manufacturing of the spunbond nonwoven fabric includes a calendering process using a smooth roll and performing a hot air process under a temperature condition similar to or corresponding to the melting point of the second filament.

That is, the prepared filament fiber is placed in a web form on a conveyor net, and then the thickness of the non-woven fabric is adjusted through a calendering process of a heated smooth roll, and then hot air having a temperature similar to the melting point of the second filament is used. To make a nonwoven fabric. In particular, the bonding method using hot air is useful for a drainage filter because pore formation is more favorable than the bonding method using an embossing roller and has excellent permeability and filter performance.

In other words, as described above, after the first filament spun and the second filament web are laminated on a conveyor net, the laminated web is subjected to a calendering process using a heated smooth roll. It gives smoothness and appropriate thickness. The weight per unit area (g/m2) of the laminated web may be adjusted through the conveyor net speed control. The web whose thickness is adjusted is bonded using hot air at a temperature similar to the melting point of the second filament to manufacture a nonwoven fabric. For example, the hot air process may be performed in a range of 160° C. to 180° C. corresponding to the melting point of the second filament.

When the weight per unit area is 145 g/m2, the polyester nonwoven fabric provided in this way has a tensile strength of 700N or more, a tear strength of 300N or more, AOS of 75㎛ or less, and a water permeability of 1.0×10 ^-2 cm/s or more. Since it satisfies all of, it has excellent mechanical properties such as tensile strength and tear strength, and has excellent filter effect due to its small effective pore size. Accordingly, it is possible to improve the discharge of pore water, suppress the passage of soil particles, and reduce clogging due to the porous structure.

The high-strength polyester nonwoven fabric, preferably polyethylene terephthalate nonwoven fabric according to the present invention, improves the mechanical properties of the filter and at the same time reduces the weight of the finished product of the drainage material, thereby increasing the efficiency of transportation and pouring processes. In particular, the present invention has the advantage of reducing cost and manufacturing eco-friendly products through the application of recycled raw materials such as polyethylene terephthalate as a matrix filament'post-industrial recycled (PIR)'. In addition, according to the method of manufacturing a nonwoven fabric of the present invention, it is possible to reduce the production cost by reducing the amount of raw materials used, and it is possible to develop various uses of low weight and high strength products.

Hereinafter, preferred embodiments are presented to aid the understanding of the present invention, but the following examples are only illustrative of the present invention, and it is obvious to those skilled in the art that various changes and modifications are possible within the scope and spirit of the present invention. It is natural that changes and modifications fall within the scope of the appended claims.

Example 1

[Example 1]

The first filament is'post-industrial recycled (PIR)' polyethylene terephthalate (intrinsic viscosity (IV): 0.82 dl/g, melting point: 255 °C) and adipic acid and isophthalic acid are copolymerized with the second filament. After preparing polyethylene terephthalate having a melting point of 176° C., each of them is melted using a continuous extruder at a spinning temperature of 290° C., and then blended and stretched so that the content ratio of the first filament and the second filament is 90:10% by weight. The discharge amount and the number of capillaries in the orifice were adjusted so that the average fineness of the prepared first filament was 8.5 denier.

Subsequently, the continuous filaments released from the capillaries were solidified with cooling air, and then stretched so that the spinning speed was 5,000 m/min using a high-pressure air stretching device to prepare filament fibers.

Next, the prepared filament fibers are laminated in the form of a web on a conveyor net by a conventional opening method. The laminated web was subjected to a calendering process using a heated smooth roll to give smoothness and an appropriate thickness.

The laminated filaments were thermally bonded at a hot air temperature of 180° C. to prepare a spunbond nonwoven fabric having a weight per unit area of 145 g/m 2 and a density of 0.35 g/cm 3.

[Example 2]

A nonwoven fabric was manufactured in the same manner as in Example 1, except for applying a polyethylene terephthalate raw material having an intrinsic viscosity (IV) of 0.75 dl/g as the first filament'post-industrial recycled (PIR)'.

[Example 3]

A nonwoven fabric was prepared in the same manner as in Example 1, except that the content ratio of the first filament and the second filament was applied at a weight ratio (wt%) of 85:15.

[Comparative Example 1]

As the first filament, a regular polyethylene terephthalate (Re-PET) raw material having an intrinsic viscosity (IV) of 0.65 dl/g was applied instead of the recycled raw material, and a copolyester having a melting point of 230° C. was applied as the second filament. The laminated filaments were prepared in the same manner as in Example 1, except that the laminated filaments were thermally bonded at a hot air temperature of 233°C.

[Comparative Example 2]

As the first filament, a nonwoven fabric was prepared in the same manner as in Comparative Example 1, except that the raw material of'post-industrial recycled (PIR)' polyethylene terephthalate having an intrinsic viscosity (IV) of 0.82 dl/g and a melting point of 255 °C was applied. Was prepared.

[Comparative Example 3]

A nonwoven fabric was prepared in the same manner as in Example 1, except that the content ratio of the first filament and the second filament was applied at a weight ratio (wt%) of 95:5.

[Comparative Example 4]

A nonwoven fabric was manufactured in the same manner as in Example 1, except that the content ratio of the first filament and the second filament was applied at a weight ratio (wt%) of 75:25.

[Reference Example 1]

A nonwoven fabric was produced in the same manner as in Example 1, except that the discharge amount was applied so that the average fineness of the first filament was 10 denier.

division First filament 2nd filament Hot air temperature
(℃) Chip
Kinds Chip IV
(dl/g) Fila.
De' content
(wt%) Chip
Kinds Melting point
(℃) content
(wt%) Example 1 PIR 0.82 8.5 90 Copoli
ester 176 10 180 Example 2 PIR 0.75 8.5 90 Copoli
ester 176 10 180 Example 3 PIR 0.82 8.5 85 Copoli
ester 176 15 180 Comparative Example 1 Re-PET 0.65 8.5 90 Copoli
ester 176 10 180 Comparative Example 2 PIR 0.82 8.5 90 Copoli
ester 230 10 233 Comparative Example 3 PIR 0.82 8.5 95 Copoli
ester 176 5 180 Comparative Example 4 PIR 0.82 8.5 75 Copoli
ester 176 25 180 Reference Example 1 PIR 0.82 10 90 Copoli
ester 176 10 180

[Assessment Methods]

For each of the Examples, Comparative Examples, and Reference Examples, physical properties were evaluated by the following method, and the results are shown in Table 2.

1. Tensile strength (N)

ASTM D 4632 method was used. Specifically, a specimen of length × width = 200 mm × 100 mm in the MD and CD directions was bitten with a top/bottom 25 mm × 50 mm jig using INSTRON's measuring equipment, and then measured at a tensile speed of 300 mm/min.

2. Tear strength (N)

ASTM D 4533 method was used. Specifically, a specimen of length × width = 200 mm × 76 mm in the MD and CD directions was bitten with a top/bottom 55 mm × 100 mm jig using INSTRON's measuring equipment, and then measured at a tensile speed of 300 mm/min.

3. Effective hole size (O ₉₅ , ㎛ )

ASTM D 4751 method was used. Put the test piece in a sieve and place a glass bead whose dimensions were measured in advance on the surface of the test piece. Shake the test piece and frame horizontally so that the beads collide with each other and pass through the test piece. The above procedure is repeated using glass beads of various sizes on the same specimen until the apparent pore size of the specimen is measured.

4. Permeability coefficient (cm/s)

The water purification method was used according to ASTM D 4491. At this time, the head loss was measured as 50 mm. The permeability coefficient was calculated by applying the following Equation 1 according to the test method.

[Equation 1]

In Equation 1, k is the water permeability coefficient (cm/s), t is the thickness of the sample (cm), A is a constant, and ψ represents the water permeability (s ⁻¹ ).

5. ^One H NMR

The first filament specimen was completely dissolved in a trifluoroacetic acid (TFA) solvent, and the contents of the copolymers of each of the Examples and Comparative Examples were compared to the TPA through the spectrum obtained by ¹ H NMR.

division Non-woven First filament Effective hole
size
(AOS)
(O ₉₅ , μm) Permeability coefficient
(cm/s) Remark thickness
(Mm) The tensile strength
(N)
MD/CD Tearing strength
(N)
MD/CD burglar
(gf/De') Copolymer content
(mol%) Example 1 0.41 742/784 332/325 4.2 1.64 71 6.6×10 ^-2 Example 2 0.39 722/739 314/320 3.9 1.64 66 6.1×10 ^-2 Example 3 0.38 774/793 308/310 4.2 1.64 63 5.8×10 ^-2 Comparative Example 1 0.41 706/722 273/260 3.6 N.D 53 5.0×10 ^-2 Poor tear Comparative Example 2 0.41 739/751 251 of 244 4.2 1.64 68 8.7×10 ^-2 Poor tear Comparative Example 3 0.43 581/597 225/208 4.2 1.64 72 9.7×10 ^-2 Insufficient tension and tear Comparative Example 4 0.37 825/813 213/227 4.2 1.64 49 3.3×10 ^-2 Poor tear Reference Example 1 0.45 746/762 304/298 4.3 1.64 82 11.0×10 ^-2 AOS bad week)
Non-woven fabric (145g/m ² ) Target properties standard:
Tensile strength (700N↑), tear strength (300N↑), AOS (75㎛↓), vertical permeability coefficient (1.0×10 ^-2 ↑)

As shown in Table 2, Examples 1 to 3 use recycled polyester having a melting point of 255°C or higher as the first filament (matrix filament), and at the same time, a copolyester having a melting point of 160°C to 180°C. 2 By adjusting the content of the filament, when the weight per unit area is 145 g/m2, the tensile strength is 700N or more, the tear strength is 300N or more, the effective pore size (AOS) is 75㎛ or less, and the water permeability coefficient is 1.0×10 ^-2 cm/ It can be that all of the conditions of physical properties of s or more are satisfied.

On the other hand, in Comparative Examples 1 to 4, it can be seen that even if the condition of the effective pore size (AOS) of 75 μm or less is satisfied, the tear strength and the tear strength are poor. In addition, in the case of Reference Example 1, the average fineness of the first filament was out of the scope of the present application during honseob spinning, and thus the criterion of the effective pore size (AOS) was not satisfied.

Claims (10)

A first filament which is recycled polyester having a melting point of 255°C or higher; And a second filament which is a copolyester having a melting point of 160° C. or more to 180° C. or less;
The content of the first filament is 80 to 90% by weight, the content of the second filament is 10 to 20% by weight,
The first filament is a matrix filament, and the second filament is a binder filament, characterized in that, high strength polyester nonwoven fabric.
The method of claim 1, wherein the polyester nonwoven fabric is
When the weight per unit area is 145 g/㎡, the tensile strength is 700N or more, the tear strength is 300N or more, the effective hole size (AOS) is 75㎛ or less, and the water permeability coefficient is 1.0×10 ^-2 cm/s or more. High-strength polyester non-woven fabric characterized by.
The high-strength polyester nonwoven fabric according to claim 1, wherein the polyester nonwoven fabric is used as a filter for civil engineering drainage materials.
The method of claim 1,
The first filament is a polyester copolymer recycled from the waste of the polyester nonwoven fabric manufacturing process, and is a polyethylene terephthalate (Post-Industrial Recycled; PIR), and a post-consumer recycled (PCR) polyethylene tere. High-strength polyester nonwoven fabric containing phthalates or mixtures thereof.
The method of claim 4,
The first filament has an intrinsic viscosity (IV) of 0.60 to 0.90 dl/g, and a melting point of 255° C. or higher. High-strength polyester non-woven fabric comprising polyethylene terephthalate (PIR).
The method of claim 1,
The first filament has an average fineness of 3 to 9 denier, and the second filament has an average fineness of 1 to 5 denier of high strength polyester nonwoven fabric.
The method of claim 1,
The first filament has a strength of 3.8 to 5 gf/Denier, and an elongation (strain) of 50 to 100%, a high strength polyester nonwoven fabric.
The high-strength polyester nonwoven fabric of claim 1, wherein the polyester nonwoven fabric has a thickness of 0.38mm to 0.41mm and a density of 0.35 g/cm3 to 0.38g/cm3 when the weight per unit area is 145 g/m2.
Blending a first filament, which is a recycled polyester having a melting point of 255°C or higher, and a second filament, which is a copolyester having a melting point of 160°C or higher to 180°C, to form a nonwoven web; And
Including; applying the nonwoven web to a calender process and a hot air process to prepare a spunbond nonwoven fabric in which the first filaments and the second filaments are laminated and bonded in a web form; and
The content of the first filament is 80 to 90% by weight, and the content of the second filament is 10 to 20% by weight.
The method of manufacturing the high-strength polyester nonwoven fabric of claim 1.
The method of claim 9,
The hot air process is a method of manufacturing a high-strength polyester nonwoven fabric performed in a range of 160°C to 180°C corresponding to the melting point of the second filament.