JPH09105063A - Weather-resistant filament nonwoven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a weather-resistant filament nonwoven fabric having excellent weather resistance without deteriorating the flexibility. SOLUTION: This nonwoven fabric is a nonwoven web composed of a core- sheath conjugate filament containing a polyester as the core component and a polyolefin as the sheath component and heat-bonded under pressure to form a prescribed form. The sheath component composed of a polyolefin is incorporated with 0.01-3.0wt.% of a benzotriazole-type or a benzophenone-type ultraviolet absorber and 0-3.0wt.% of a hindered amine-type, a hindered phenol-type or a phosphorus-type antioxidant. For getting excellent weather resistance, the core component consisting of a polyester may be incorporated with 0.01-3.0wt.% of a benzotriazole-type or a benzophenone-type ultraviolet absorber and 0-3.0wt.% of a hindered amine-type, a hindered phenol-type or a phosphorus- type antioxidant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather-resistant long-fiber non-woven fabric suitable for use in fields requiring weather resistance, particularly industrial materials such as agricultural, horticultural and civil engineering.

[0002]

2. Description of the Related Art Conventionally, various non-woven fabrics made of thermoplastic polymers such as polyolefins and polyesters have been known as materials for medical / sanitary materials, general life-related materials and some industrial materials. However, in recent years, the pursuit of resource saving and economic efficiency has been reconsidered, and some applications that were conventionally disposable, such as agricultural materials for heat-insulating lining sheets for agricultural greenhouses, etc., have taken 2 to 3 years. The repeated use of has become required. Along with this,
There is a demand for a non-woven fabric having weather resistance superior to those of the conventional non-woven fabrics.

Conventionally, for the purpose of improving weather resistance, an antioxidant, a heat-resistant agent, an ultraviolet stabilizer or an ultraviolet absorber has been added. However, in the method of adding any of these conventional additives, sufficient weather resistance to be used in fields requiring high weather resistance such as agricultural materials, automotive interior materials, outdoor reinforcement materials, etc. I can't get it.

On the other hand, as a means for improving weather resistance, it is known that a nonwoven fabric is laminated with a film-like sheet having weather resistance to form a laminate. However, such laminates are coarse and hard and have poor air permeability, and thus cannot be applied to applications requiring flexibility and air permeability, for example, agricultural materials.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a weather-resistant long-fiber nonwoven fabric having excellent weather resistance without impairing flexibility. .

[0006]

In order to solve the above-mentioned problems, the present invention has the following features. 1. Polyester as a core component, a nonwoven web consisting of a core-sheath type composite long fibers having a polyolefin as a sheath component is a non-woven fabric that is kept in a predetermined shape by being hot pressed, and in the sheath component made of the polyolefin, Benzotriazole-based or benzophenone-based UV absorber 0.01
-3.0 wt% and 0 to 0 of hindered amine-based or hindered phenol-based or phosphorus-based antioxidant
3.0% by weight of a weather-resistant long-fiber nonwoven fabric.

[0007] 2. The non-woven fabric, further comprising a benzotriazole-based or benzophenone-based ultraviolet absorber 0.01 to 3.0 in a core component made of polyester.
A weather resistant long-fiber non-woven fabric, characterized in that the content of the hindered amine-based or hindered phenol-based or phosphorus-based antioxidant is 0 to 3.0% by weight.

[0008] 3. A weather-resistant long-fiber nonwoven fabric comprising a binder resin containing at least an ultraviolet absorber among an ultraviolet absorber and an antioxidant.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the long fibers constituting the weather-resistant long-fiber nonwoven fabric of the present invention will be described. Examples of the polyester forming the core component of the composite continuous fiber applied to the present invention include polyethylene terephthalate or polybutylene terephthalate, or a polyester mainly containing these, such as isophthalic acid or adipic acid as an acid component. It may be a copolyester containing tetramethylene glycol, neopentyl glycol or the like as a carboxylic acid and / or a diol component. When a copolymerized polyester is used, the content of the ethylene terephthalate unit or the butylene terephthalate unit is preferably at least 80 mol% from the viewpoint of the heat resistance of the polymer material itself and the strength of the obtained nonwoven fabric.

Examples of the polyolefin forming the sheath component of the composite long fibers applied to the present invention include crystalline polypropylene, high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene and the like. Among these, those having a particularly high melting point are preferable because they are excellent in the cooling property of the yarn, and crystalline polypropylene is preferable. Further, in order to improve the spinnability of the crystalline polypropylene, polypropylene in which ethylene is randomly copolymerized may be used.

The polyester used in the present invention has a number average molecular weight of about 20,000 or more, preferably 40,000 or more, more preferably 60,000 or more. Is good. Further, in order to increase the degree of polymerization of polyester, a chain-extended product with a small amount of diisocyanate or tetracarboxylic dianhydride may be used.

In the present invention, when the polyolefin applied is polyethylene, the melt index value (hereinafter referred to as MI value) measured according to the method described in ASTM-1238 (E) is 10 to 40 g / 10 min. Is preferred. When the applied polyolefin is polypropylene, the melt flow rate value measured according to the method described in ASTM-1238 (L) (hereinafter, M
The FR value) is preferably 40 to 100 g / 10 minutes. If the melt viscosity exceeds the upper limit of the preferred melt viscosity range, the melt viscosity is too low, so that the fiber uniformity is inferior, and the resulting nonwoven fabric tends to be uneven. On the other hand, if the melt viscosity is less than the lower limit of the preferred melt viscosity range, the melt viscosity is too high, resulting in inferior high-speed yarn formability.
Not preferred.

Further, each of the above-mentioned polymers applied in the present invention may optionally contain, for example, a matting agent, a pigment,
Various additives such as a crystal nucleating agent may be added as long as the effects of the present invention are not impaired.

In the present invention, it is necessary that at least the sheath component contains an ultraviolet absorber and an antioxidant, and the core component also contains an ultraviolet absorber and an antioxidant. Therefore, it is possible to exhibit more excellent weather resistance.

The ultraviolet absorber applied to the present invention is a benzotriazole type or benzophenone type compound. The ultraviolet absorber functions to absorb the ultraviolet rays in the polymer, and prevents the polymer from being deteriorated by the ultraviolet rays.

Examples of the benzotriazole type ultraviolet absorber include 2- (5-methyl-2-hydroxyphenyl) benzotriazole and 2- [3,5-bis (2,2).
2'-dimethylpropyl) -2-hydroxyphenyl]
Benzotriazole, 2- (3-tert-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3,5-di-tert-butyl-2-hydroxyphenyl) -5-chloro Benzotriazole,
2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole,
2,2′-methylenebis [4- (1,1 ′, 3,3′-
Tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol], 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2-
(2′-hydroxy-5′-tert-butylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′,
5'-di-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-3'-tert-butyl-
5'-methylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3 ', 5'-di-tert-
Butylphenyl) -5-chlorobenzotriazole, 2
-(2'-hydroxy-3 ', 5'-di-tert-amylphenyl) benzotriazole, 2- [2'-hydroxy-3'-(3 ", 4", 5 ", 6" -Tetrahydrophthalimidomethyl) -5'-methylphenyl] benzotriazole. Among them, in particular, 2-
[2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2,
2'-methylenebis [4- (1,1 ', 3,3'-tetramethylbutyl) -6- (2H-benzotriazole-
2-yl) phenol] is preferred because of its excellent heat resistance.

As the benzophenone type ultraviolet absorber,
For example, 2,4-dihydroxybenzophenone, 2,2
2 ', 4,4'-tetrahydroxybenzophenone, 2
-Hydroxy-4- (β-hydroxyethoxy) -benzophenone, bis (5-benzoyl-4-hydroxy-
2-methoxyphenyl) methane, 2-hydroxy-4-
Methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4,
4'-dimethoxybenzophenone, 2-hydroxy-4
-Methoxy-5-sulfobenzophenone.
Among these, bis (5-benzoyl-4-hydroxy-2-methoxyphenyl) methane is particularly preferred for the same reason as described above.

The antioxidant applied to the present invention is a hindered amine compound, a hindered phenol compound or a phosphorus compound. Antioxidants are intended to prevent thermal oxidation of the polymer caused by heat storage and oxygen present, especially in outdoor applications.

Examples of the antioxidant used in the present invention include triethylene glycol-bis [3- (3-tert-
Butyl-5-methyl-4-hydroxyphenyl) propionate], 4,4'-thiobis- (3-methyl-6-
tert-butylphenol), 2,2'-methylenebis-
(4-methyl-6-tert-butylphenol), 2,
2'-ethylidene-bis- (4,6-di-tert-butylphenol), tris- (3,5-di-tert-butyl-
4-hydroxybenzyl) -isocyanurate, tris- (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 2,6-di-tert-butyl-p-cresol, butylated hydroxyanisole ( BHA),
2,6-di-tert-butyl-4-ethylphenol, stearyl-β- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 2,2′-methylene-bis- (4-ethyl -6-tert-butylphenol), 4,4'-butylidene-bis- (3-methyl-6
-Tert-butylphenol), 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4)
-Hydroxybenzyl) benzene, tetrakis- [methylene-3- (3 ', 5'-di-tert-butyl-4'-hydroxyphenyl) propionate] methane, bis (3,3'-bis- (4'-hydroxy -3'-tert-
Butylphenyl) butyric acid] glycol esters and tocopherols.

In the present invention, it is important that at least the sheath component contains an ultraviolet absorber. This is because sunlight is absorbed from the fiber surface layer, so that it is possible to effectively exhibit the weather resistance performance by adding the ultraviolet absorber intensively to the sheath component. Furthermore, in the present invention, the weather resistance can be further improved by adding an ultraviolet absorber to the core component in addition to the sheath component. This is because a part of sunlight reaching the core component is completely absorbed by the ultraviolet absorber contained in the core component, whereby the deterioration of the polymer can be efficiently suppressed. Therefore, even if the ultraviolet absorber is contained only in the core component, the effect of the present invention cannot be obtained.

In the present invention, the content of the ultraviolet absorbent contained in the polyolefin sheath component is 0.01.
It is necessary to be in the range of 3.0 wt%. If the content of the ultraviolet absorber in the sheath component is less than 0.01% by weight, sufficient weather resistance cannot be obtained, and conversely, if it exceeds 3.0% by weight, the weather resistance reaches saturation. Therefore, it is uneconomical, and further deteriorates the spinnability and causes the coloring of the fibers, both of which are not preferable. For these reasons, the content of the ultraviolet absorber in the sheath component is more preferably 0.05 to 0.3% by weight.

Further, in the present invention, when the ultraviolet absorber is added to the core component in addition to the sheath component, the content of the ultraviolet absorber contained in the polyester core component is
It is preferably in the range of 0.01 to 3.0% by weight.
If the content of the ultraviolet absorber in the core component is less than 0.01% by weight, the desired excellent weather resistance cannot be obtained. Conversely, if it exceeds 3.0% by weight, the weather resistance is saturated. It is uneconomical because it reaches the end, and further deteriorates the spinnability and causes the coloring of fibers, both of which are not preferable. For these reasons, the content of the ultraviolet absorber in the core component is
More preferably, it is in the range of 0.05 to 0.2% by weight.

Further, in the present invention, an antioxidant is contained for the purpose of preventing thermal oxidation of the polymer, but for at least the same reason as the above-mentioned UV inhibitor, at least in the sheath component,
It is preferable to add an antioxidant to the core component in addition to the sheath component.

In the present invention, the content of the antioxidant contained in the polyolefin sheath component is 0 to 3.0.
It is preferable to set the weight%. The antioxidant does not have to be added to the polymer, but when the antioxidant is added to the sheath component, thermal oxidation of the polymer caused by heat storage by sunlight and oxygen present is suppressed, and further the weather resistance is improved. It is preferable because it can be improved. When the content of the antioxidant in the sheath component exceeds 3.0% by weight, it is uneconomical because the weather resistance performance reaches saturation, which is further unfavorable because it leads to deterioration of the spinnability and coloring of the fibers. . For these reasons, the content of the antioxidant in the sheath component is 0.05 to
The range of 0.3% by weight is more preferable.

Further, in the present invention, when the antioxidant is added to the core component in addition to the sheath component, the content of the antioxidant contained in the polyester core component is 0 to
It is preferably 3.0% by weight. The antioxidant does not have to be added to the polymer, but when the antioxidant is added to the core component, thermal oxidation of the polymer generated by heat storage by the sunlight and oxygen present is suppressed, and further the weather resistance is improved. It is preferable because it can be improved. If the content of the antioxidant in the core component exceeds 3.0% by weight, it is uneconomical because the weather resistance performance reaches saturation, which is further unfavorable because it leads to deterioration of the spinnability and coloring of the fibers. . For these reasons, the content of the antioxidant in the core component is 0.
More preferably, it is in the range of 05 to 0.2% by weight.

Further, in the present invention, the total content of the ultraviolet absorber and the antioxidant contained in all the polymers forming the core-sheath type composite continuous fiber is 0.02 to 12.0% by weight.
It is preferred that If the total content is less than 0.02% by weight, sufficient weather resistance cannot be obtained, and conversely, if the total content exceeds 12.0% by weight, the spinnability deteriorates, and in particular,
When the spun bond method with a spinning speed of 2500 m / min or more is adopted, yarn breakage occurs frequently.

The composite long fibers constituting the nonwoven fabric of the present invention are
The core-sheath structure must be such that the sheath component wraps around the core component everywhere. Then, it is important to place polyester, which is a polymer having a relatively high melting point, in the core and generally, polyolefin, which is a polymer having a lower melting point than polyester, in the sheath. That is, according to the present invention, a relatively large amount of an ultraviolet absorber and an antioxidant are added to a polyolefin having a relatively low melting point, and the main surface of the fiber is expressed by wrapping the surface of the fiber as a sheath component, and the core component is expressed. It is possible to absorb the sunlight that has passed through the sheath component by the ultraviolet absorber and the antioxidant contained in the above to complement the weather resistance and to have excellent weather resistance.

In the core-sheath type composite long fibers constituting the nonwoven fabric of the present invention, the composite ratio of the core component and the sheath component may be appropriately determined depending on the intended use of the nonwoven fabric, but when the sheath component is too small, It becomes difficult to obtain sufficient weather resistance. Therefore, the weight ratio of the sheath component to the core component is usually 0.5 to
It is preferable to select within the range of about 3.0.

The composite long fibers constituting the nonwoven fabric of the present invention are
The single yarn fineness is preferably 2.0 to 10 denier. If the single-fiber fineness is less than 2.0 denier, yarn breakage at the time of spinning is large, resulting in poor operability. Conversely, if the single-fiber fineness exceeds 10 denier, the texture of the obtained nonwoven fabric becomes hard and the flexibility is inferior. For example, it is unsuitable in the field of agricultural materials and the like that require flexibility.

The basis weight of the weather-resistant long-fiber nonwoven fabric of the present invention is not particularly limited because it is selected depending on the purpose of use, but is generally preferably in the range of 10 to 150 g / m ² . If the basis weight is less than 10 g / m ² , the mechanical strength is inferior and cannot be put to practical use. Conversely, the basis weight is 150 g /
If it exceeds m ² , the nonwoven fabric has a hard texture, which is unsuitable and unfavorable in, for example, agricultural materials and the like where flexibility is required.

The nonwoven web of the present invention is a nonwoven web that is partially or entirely heat-welded to maintain a predetermined form. That is, the nonwoven fabric of the present invention is a sheet having a nonwoven structure. Since the non-woven fabric of the present invention is formed of the core-sheath type composite long fibers, it has excellent flexibility even though the form is maintained by the hot pressing.

The partial heat-bonding of the non-woven web forms a spot-shaped fused area by embossing or ultrasonic welding, in which the constituent fibers are partially heat-bonded. Has been done. At this time, the shape of the formed point-like fusion zone may be any shape such as a round shape, an elliptical shape, a diamond shape, a triangular shape, a T shape, a well shape, and a lattice shape. However, at this time, it is preferable that the area of the point-like fusion zone be 0.1 to 1.5 mm ² .

In the partial thermal pressure welding of the non-woven web, the ratio of the area of all the spot-shaped fused regions to the total surface area of the non-woven web represented by the following equation, that is, the press contact area ratio A is 4 to 50%.
It is preferred that A (%) = [Area of total fused area (cm ² ) / total surface area of nonwoven web (cm ² )] × 100 If the area of press-contact area is less than 4%, the number of point-like fused areas is small, so that it is obtained. The resulting nonwoven fabric is inferior in mechanical strength and dimensional stability, and furthermore has a reduced fuzzing prevention property, which is not preferable in applications such as living materials and agricultural materials.
On the other hand, if the pressed area ratio exceeds 50%, the obtained nonwoven fabric is coarsely cured, which is not preferable in the field where flexibility is required.

Further, in the partial thermal pressure welding of the non-woven web, the density of the spot-like fused regions in the total surface area of the non-woven web represented by the following formula, that is, the pressure contact density B is 7 to 80 points / cm. It is preferably ² . B (points / cm ² ) = number of pressure junctions (points) / total surface area of nonwoven web (cm ² ) If the density of pressure junctions is less than 7 points / cm ² , the mechanical strength and dimensional stability of the obtained nonwoven fabric It is inferior in the properties and furthermore, the fuzz prevention property is reduced, which is not preferable in applications such as living materials and agricultural materials. On the other hand, if the press contact density exceeds 80 points / cm ² , the resulting nonwoven fabric will be coarsely cured, which is not preferable in the field where flexibility is required.

The whole surface heat-pressing of the non-woven web is formed by calendering using a smooth roll. The non-woven fabric that has been heat pressed over the entire surface has excellent fluff prevention properties, and it is possible to easily adjust breathability, bulkiness and compactness by appropriately selecting pressure contact conditions such as roll temperature and roll spacing, depending on the application. It is a useful thing that can be done.

In the weather-resistant long-fiber nonwoven fabric of the present invention,
A binder resin can also be applied to the nonwoven fabric whose shape is maintained by hot pressing. This is mainly intended for coating only the surface of the nonwoven fabric, whereby the fuzz prevention property can be improved. Accordingly, in a field where fluff may be generated due to friction or wear during use, for example, in the field of living materials and agricultural materials, a weather-resistant long-fiber nonwoven fabric obtained by adding a binder resin is suitable. In the field of agricultural materials, it is preferable to use a binder resin having hydrophilicity. However, in the case of a non-woven fabric whose shape is maintained by heat-bonding the entire surface, it is not necessary to add a binder resin, and it is possible to provide fluff prevention properties.

As the hydrophilic binder resin, for example,
Examples include acrylates such as acrylonitrile, polyvinyl acetate, polyvinyl chloride, and polyvinyl alcohol, which may be appropriately selected and used.

The amount of the binder resin applied is preferably 30% by weight or less based on the weight of the nonwoven fabric. If the applied amount of the binder resin exceeds 30% by weight based on the basis weight of the nonwoven fabric, the flexibility of the obtained nonwoven fabric will be impaired, and the nonwoven fabric will be roughly cured, so that even if it has excellent weather resistance, It is not preferable because it cannot be practically used depending on the use. On the other hand, depending on the application, for example, in agricultural materials of a heat insulating lining sheet of an agricultural house, in order to form a thin film of a hydrophilic binder resin on the surface of the nonwoven fabric and improve the heat insulating property, a hydrophilic binder resin is used. Is preferably 5% by weight or more based on the basis weight of the nonwoven fabric.

It is preferable that the binder resin contains at least the ultraviolet absorber of the ultraviolet absorber and the antioxidant in order to maintain the weather resistance. The antioxidant does not have to be contained in the resin, but when the antioxidant is added, thermal oxidation of the polymer caused by heat storage by sunlight and oxygen present is suppressed, and the weather resistance can be further improved. Therefore, it is preferable.

Next, a method for producing the weather-resistant long-fiber nonwoven fabric of the present invention will be described. The long-fiber nonwoven fabric of the present invention can be efficiently produced by a so-called spunbond method. That is, as the core component and the sheath component, respectively,
A spinneret having a core-sheath composite cross section is prepared by mixing the above-mentioned polymer chips with the above-mentioned ultraviolet absorber and / or antioxidant by a masterbatch method or a dry blending method so that each of them contains a predetermined amount. After melt-spinning using, the obtained spun yarn is cooled by using a conventionally known cooling device such as horizontal spraying or annular spraying, and then pulled by a suction device so as to have a desired fineness. Take over. From the viewpoint of the strength of the obtained non-woven fabric, the traction speed is preferably 2000 m / min or more. After the yarn group discharged from the suction device is spread, it is spread and accumulated on a moving deposition device such as a conveyor made of a screen to form a web. Then
By heat-pressing this web partially or entirely with a heat-pressing device, a core-sheath type composite long-fiber nonwoven fabric can be obtained.

Furthermore, when a weather resistant long-fiber nonwoven fabric containing a binder resin is desired, a dipping method, a coating method, a foam impregnation method or the like may be applied after the heat-pressing treatment.

[0042]

The present invention will be described below in detail with reference to examples. Note that the present invention is not limited to only these examples.

In the following examples, each characteristic value was obtained as follows.

Melting point (° C.) of the polymer: The temperature giving the extreme value of the melting endothermic peak measured at a temperature rising rate of 20 ° C./min using a DSC-2 type differential scanning calorimeter manufactured by Perkin Elmer. The melting point was used.

Intrinsic viscosity of polyester: 0.5 g of a sample was dissolved in 100 ml of a mixed solvent of phenol and ethane tetrachloride in an equal weight ratio, and measured by a conventional method.

MI value of polyethylene (g / 10 minutes):
It was measured according to the method described in ASTM-1238 (E).

MFR value of polypropylene (g / 10
Min): Measured according to the method described in ASTM-1238 (L).

Single yarn fineness (denier): Determined by performing density correction using an electron microscope on fibers pulled and thinned by a suction device.

-Basis weight (g / m ² ): 10 pieces each of 10 cm in length × 10 cm in width were prepared from a standard state sample, and after reaching equilibrium moisture, the weight of each sample piece was measured and obtained. The average value of the above values was converted per unit area and used as the basis weight.

Weather resistance [strength retention] (%) of non-woven fabric:
The nonwoven fabric was exposed outdoors, the tensile strength after 5 months was measured in a standard state, and the strength retention (%) with respect to the initial value of the tensile strength before exposure was expressed by the following formula and compared.

Strength retention rate (%) = (tensile strength after 5 months / initial value of tensile strength) × 100 When 70% or more of the initial tensile strength before exposure is maintained, the weather resistance is good. I evaluated that there is.

Spinnability of long fibers: The spun yarn discharged from the spinneret was observed, and the following 3 depending on the number of times the yarn was broken.
It was evaluated in stages.

◯: Number of yarn breakage 0 times / 1 spinning spindle / 24 hours Δ: Number of thread breaks 1-2 times / 1 spinning spindle / 24 hours ×: Number of yarn breaks 3 times / 1 spinning spindle / 24 hours

Tensile strength of nonwoven fabric (kg / 5 cm width):
In accordance with the synthetic fiber long-fiber non-woven fabric test method, Toyo Baldwin Co., Ltd. Tensilon UTM-4-1 is a constant-speed stretching type testing machine.
Using a 00 type, a test piece having a width of 5 cm and a length of 30 cm was grabbed, measured under the conditions of an interval of 20 cm and a pulling speed of 10 cm / min, and the average value of 10 measurements was obtained.

・ Total hand of non-woven fabric [flexibility]
(G): Measured with a slit width of 1.0 cm according to the handle odometer method described in JIS-L-1096.

Example 1 Polyethylene terephthalate having a melting point of 260 ° C. and an intrinsic viscosity of 0.70 was used as a core component, and MFR was used as a sheath component.
Using crystalline polypropylene having a value of 60 g / 10 minutes and a melting point of 160 ° C., 2- (2′-hydroxy-5′-methylphenyl) benzotriazole as an ultraviolet absorber and an antioxidant for each of the core component and the sheath component. Tetrakis- [methylene-3- (3 ', 5'-di-tert as an agent
-Butyl-4'-hydroxyphenyl) propionate] methane was mixed at a content ratio shown in Table 1 by a masterbatch method to be a raw material, and a core-sheath type composite long-fiber nonwoven fabric was manufactured by a spunbond method. Specifically, the polymer chips were melted using an extruder type melt extruder, and spun through a spinneret for core-sheath type composite.
After the spun yarn is cooled, it is taken up by a suction device, opened, and collected and accumulated on the moving collecting surface, and consists of a core-sheath type composite continuous fiber having a single yarn fineness of 4.0 denier. Basis weight 50
A non-woven web of g / m ² was used. This non-woven web was rolled at a roll temperature of 13 by a thermocompression bonding device including an embossing roll.
Partially heat-pressed under conditions of 0 ° C and 20% of pressing area ratio,
A long-fiber nonwoven fabric was obtained. Table 1 shows the performance and the spinning properties of the obtained long-fiber nonwoven fabric.

Example 2 A binder resin was applied to the long-fiber nonwoven fabric obtained in Experiment No. 2 of Example 1. That is, an acrylic ester containing 2.0% by weight of 2- (2′-hydroxy-5′-methylphenyl) benzotriazole as an ultraviolet absorber was added to the nonwoven fabric by a dipping method in an amount of 1% by weight.
3% by weight of impregnation. Table 1 shows the performance and the spinning properties of the obtained long-fiber nonwoven fabric.

Example 3 In the same manner as in Example 2, a binder resin was applied to the long fiber nonwoven fabric obtained in Experiment No. 8 of Example 1. Table 1 shows the performance and the spinning properties of the obtained long-fiber nonwoven fabric.

[0059]

[Table 1]

As is clear from Table 1, the long-fiber nonwoven fabric obtained in Experiment No. 1 of Example 1 contains no ultraviolet absorber or antioxidant in either the core component or the sheath component, and therefore has a weather resistance. It was inferior in sex. The long-fiber non-woven fabrics obtained in Experiment No. 2 to Experiment No. 8 of Example 1 each have a content of the ultraviolet absorber and the antioxidant that are within the scope of the present invention, and thus have excellent weather resistance, Moreover, it had sufficient flexibility. In Experiment No. 9 of Example 1, since the contents of the ultraviolet absorber and the antioxidant were all outside the range of the present invention, the yarn-forming property was deteriorated, the yarn breakage occurred frequently, and the nonwoven web was obtained. There wasn't.

The long-fiber non-woven fabric obtained in Example 2 was coated with a binder resin on the surface of the non-woven fabric, and thus was more excellent in fluff prevention than the long-fiber non-woven fabric obtained in Experiment No. 2 of Example 1. However, the flexibility was slightly lowered, but the weather resistance was excellent.

The long-fiber non-woven fabric obtained in Example 3 was coated with a binder resin on the surface of the non-woven fabric, and therefore was more excellent in fluff prevention than the long-fiber non-woven fabric obtained in Experiment No. 8 of Example 1. However, the flexibility was slightly lowered, but the weather resistance was excellent.

[0063]

According to the present invention, a weather-resistant long-fiber nonwoven fabric having excellent weather resistance can be provided without impairing flexibility.

The weather-resistant long-fiber nonwoven fabric of the present invention is suitable as a material for fields requiring weather resistance, particularly industrial materials represented by agriculture, horticulture and civil engineering.

Claims (8)

[Claims] 1. A non-woven fabric comprising a core-sheath type composite long fiber having a polyester as a core component and a polyolefin as a sheath component, which is heat-pressed to maintain a predetermined shape, and comprises the polyolefin. 0.01 to 3.0% by weight of a benzotriazole-based or benzophenone-based ultraviolet absorber and 0 to 3.0% by weight of a hindered amine-based or hindered phenol-based or phosphorus-based antioxidant in the sheath component. , A weather-resistant long-fiber non-woven fabric characterized by being contained. 2. A benzotriazole-based or benzophenone-based UV absorber in an amount of 0.05 to 0.3% by weight and a hindered amine-based, hindered phenol-based, or phosphorus-based antioxidant in a sheath component composed of a polyolefin. The weather-resistant long-fiber non-woven fabric according to claim 1, wherein the content is 0.05 to 0.3% by weight. 3. A benzotriazole-based or benzophenone-based UV absorber in an amount of 0.01 to 3.0% by weight and a hindered amine-based or hindered phenol-based or phosphorus-based antioxidant are contained in a polyester core component. % To 3.0% by weight is contained, The weather-resistant long-fiber nonwoven fabric according to claim 1 or 2, characterized in that it is contained. 4. A benzotriazole-based or benzophenone-based UV absorber in an amount of 0.05 to 0.2% by weight and a hindered amine-based or hindered phenol-based or phosphorus-based antioxidant are contained in a polyester core component. The weather-resistant long-fiber nonwoven fabric according to any one of claims 1 to 3, wherein the content is 0.05 to 0.2% by weight. 5. The total content of the ultraviolet absorber and the antioxidant contained in all the polymers forming the core-sheath type composite continuous fiber is 0.02 to 12.0% by weight. The weather-resistant long-fiber non-woven fabric according to any one of claims 1 to 4, which is characterized in that. 6. The total surface area of the nonwoven web in a point fusion zone formed by subjecting the nonwoven web to a predetermined shape by being partially heat-bonded to the nonwoven web. The ratio of the area of all the spot-shaped fused regions to 4 to 50% is 4 to 50%, and the weather-resistant long-fiber nonwoven fabric according to any one of claims 1 to 5. 7. The non-woven web is heat-pressed over the entire surface to maintain a predetermined shape.
The weather-resistant long-fiber nonwoven fabric according to any one of the above items. 8. The weather-resistant long fiber according to claim 1, further comprising a binder resin containing at least an ultraviolet absorber among the ultraviolet absorber and the antioxidant. Non-woven fabric.