KR102079226B1 - Spunbond nonwoven fabric for mulching and method of preparing the same - Google Patents

Abstract

Disclosed are a spunbond nonwoven fabric for mulching and a method of manufacturing the same. The disclosed mulching spunbond nonwoven fabric is a first nonwoven fabric layer containing a first pigment component having a light reflectance value of 3 to 10% and a second pigment having a light reflectance value of 30 to 50% as disposed on the first nonwoven fabric layer. A light reflection coefficient (r) represented by the following formula (1) comprising a second nonwoven fabric layer containing the component is 3 to 20, and the light absorption coefficient (a) represented by the following formula (2) is 45 to 65:
[Equation 1]
r (g / m ² ) = [(A * Y _A ) + (B * Y _B )] / 100
(Wherein A is the weight per unit area of the first nonwoven fabric layer (g / m ² ), B is the weight per unit area of the second nonwoven fabric layer (g / m ² ), and Y _A is the light reflectance of the first pigment component Value (%), Y _B is the light reflectance value (%) of the second pigment component)
[Equation 2]
a (g / m ² ) = [(A * X _A ) + (B * X _B )] / 100
(Wherein A is the weight per unit area of the first nonwoven fabric layer (g / m ² ), B is the weight per unit area of the second nonwoven fabric layer (g / m ² ), and X _A is the light absorption rate of the first pigment component Value (%) (100-Y _A ), and X _B is the light absorption value (%) (100-Y _B ) of the second pigment component).

Description

Spunbond nonwoven fabric for mulching and method of preparing the same

Disclosed are a spunbond nonwoven fabric for mulching and a method of manufacturing the same. More specifically, disclosed is a spunbond nonwoven fabric for mulching comprising a first nonwoven fabric layer having a light reflectance value of 3 to 10% and a second nonwoven fabric layer having a light reflectance value of 30 to 50%, and a method of manufacturing the same.

The agricultural sector has invested a lot of money, time and effort to reduce labor and production costs.

In orchards, mulching products have been developed and supplied to suppress weed growth and reduce labor. Among them, the black nonwoven fabric for mulching of Korean Patent Publication No. 10-0248939 exhibited excellent herbicidal effect. Subsequently, the light reflectance value is very low, which lowers the colorability of the fruit, and due to excessive absorption of light, heat accumulates in the nonwoven fabric and geothermal heat rises, which adversely affects the roots of crops such as fruit trees, peppers, tomatoes, and the like, and inhibits the growth of fruits. There was a problem.

Various techniques have been proposed to solve these conventional problems, for example, Korean Patent Publication No. 10-0742962, by applying the color of the upper layer of the mulching nonwoven fabric in white color to increase the light reflectance value of the fruit colorability However, the light reflectance value is so high that fruits and fruits are burned, which lowers the merchandise and impedes their growth, and the lower black layer is so thin that the herbicidal effect is reduced, which increases the total weight of the nonwoven fabric. A bigger problem has arisen.

[Preceding technical literature]

[Patent Documents]

Patent Document 1: Korean Patent Publication No. 10-0248939

Patent Document 2: Korea Patent Publication No. 10-0742962

One embodiment of the present invention provides a spunbond nonwoven fabric for mulching comprising a first nonwoven fabric layer having a light reflectance value of 3 to 10% and a second nonwoven fabric layer having a light reflectance value of 30 to 50%.

Another embodiment of the invention provides an article comprising the spunbond nonwoven fabric for mulching.

One aspect of the invention,

A first nonwoven fabric layer containing a first pigment component having a light reflectance value of 3 to 10%; And

A second nonwoven layer disposed on the first nonwoven layer and containing a second pigment component having a light reflectance value of 30 to 50%,

The light reflection coefficient r represented by the following formula 1 is 3 to 20,

The light absorption coefficient (a) represented by Equation 2 provides a spunbond nonwoven fabric for mulching having a thickness of 45 to 65:

[Equation 1]

r (g / m ² ) = [(A * Y _A ) + (B * Y _B )] / 100

(Wherein A is the weight per unit area of the first nonwoven fabric layer (g / m ² ), B is the weight per unit area of the second nonwoven fabric layer (g / m ² ), and Y _A is the light reflectance of the first pigment component Value (%), Y _B is the light reflectance value (%) of the second pigment component)

[Equation 2]

a (g / m ² ) = [(A * X _A ) + (B * X _B )] / 100

(Wherein A is the weight per unit area of the first nonwoven fabric layer (g / m ² ), B is the weight per unit area of the second nonwoven fabric layer (g / m ² ), and X _A is the light absorption rate of the first pigment component Value (%) (100-Y _A ), and X _B is the light absorption value (%) (100-Y _B ) of the second pigment component).

The weight ratio of the first nonwoven fabric layer to the second nonwoven fabric layer may be 25 to 75:75 to 25.

The first nonwoven fabric layer and the second nonwoven fabric layer may each include 0.1 to 1.5 parts by weight of an ultraviolet stabilizer based on 100 parts by weight of the total weight of each layer.

The first nonwoven fabric layer and the second nonwoven fabric layer may each include a propylene polymer having a melt index (MFR: measurement temperature of 230 ° C. and a load of 2.16 kg) of 20 to 80 g / 10 minutes.

The propylene-based polymer may include a propylene homopolymer, a propylene-ethylene copolymer, a propylene-ethylene-butylene terpolymer or a combination thereof.

The color of the first nonwoven fabric may be the same as that of the first pigment component, and the color of the first pigment component may be black, dark blue, or violet.

The color of the second nonwoven fabric is the same as the color of the second pigment component, the color of the second pigment component is BLUE, LIGHT BLUE, GRAY, LIGHT GRAY, pink (PINK), YELLOW or LIGHT BLUE.

The mulching spunbond nonwoven fabric may have a total thickness of 0.1 to 1.0 mm.

The mulching spunbond nonwoven fabric may have a weight per unit area of 48 ~ 85g / m ² .

The mulching spunbond nonwoven fabric may have water permeability.

Another aspect of the invention,

5 to 20 parts by weight of the UV stabilizer, 5 to 30 parts by weight of the first pigment component having a light reflectance value of 3 to 10%, and a first melt index (MFR: measuring temperature of 230 ° C., load of 2.16 kg) of 20 to 80 g / 10 minutes Melting 50 to 90 parts by weight of a propylene polymer with a kneader to prepare a first pigment master batch chip;

5 to 20 parts by weight of the UV stabilizer, 5 to 30 parts by weight of the second pigment component having a light reflectance value of 30 to 50%, and a second having a melt index (MFR: measurement temperature 230 ° C., load 2.16 kg) of 20 to 80 g / 10 minutes Melting 50 to 90 parts by weight of a propylene polymer with a kneader to prepare a second pigment master batch chip;

After the third propylene polymer chip having a melt index (MFR: measurement temperature of 230 ° C. and a load of 2.16 kg) of 20 to 80 g / 10 minutes was introduced into the first extruder, the first pigment master batch chip was introduced into the first extruder. Melting, mixing, and homogenizing to melt-spin through a spinneret, forming a filament through a cooling and stretching process, and then laminating on a continuously moving porous conveyor belt to form a first nonwoven layer;

A fourth propylene polymer chip having a melt index (MFR: measurement temperature of 230 ° C. and a load of 2.16 kg) of 20 to 80 g / 10 minutes was introduced into a second extruder, and then the second pigment master batch chip was introduced into the second extruder. To melt, mix and homogenize to melt spin through spinnerets, form a filament through a cooling and stretching process, and then laminate on the first nonwoven layer formed on the continuously moving porous conveyor belt to form a second nonwoven layer Obtaining a nonwoven fabric of a multilayer structure by forming a;

Transferring the nonwoven fabric of the multilayer structure to a calendar and then heat-bonding to impart form stability; And

It provides a method for producing a spunbond nonwoven fabric for mulching comprising the step of applying a hydrophilic agent to the non-woven fabric of the multilayer structure to impart water permeability.

The first propylene polymer, the second propylene polymer, the third propylene polymer and the fourth propylene polymer may be the same or different from each other.

Mulching spunbond nonwoven fabric according to an embodiment of the present invention improves the coloring properties of the fruit without reducing the herbicidal effect, prevents burns of fruit trees due to light overreflection, and heat storage in the nonwoven fabric due to light absorption Due to the rise in temperature, the roots are adversely affected and do not inhibit the growth of fruit trees.

However, effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a photograph showing a deterioration state of a spunbond nonwoven fabric for mulching that does not contain an ultraviolet light stabilizer.
2 is a color chart used to confirm the light reflectance values of the spunbonded nonwoven fabrics prepared in Examples 1 to 4 and Comparative Examples 1 to 7. FIG.
3A and 3B are photographs showing an example of use of a spunbond nonwoven fabric for mulching according to an embodiment of the present invention.

Hereinafter, a spunbond nonwoven fabric for mulching according to an embodiment of the present invention will be described in detail.

As used herein, the term "light reflectance value" means the total amount of visible and available light that is reflected by one surface at all wavelengths in all directions when light is irradiated, and refers to the light reflectance referred to herein. The value is measured according to the British Standard BS8493: 2008 + A1: 2010.

Mulching spunbond nonwoven fabric according to an embodiment of the present invention includes a first nonwoven fabric layer and a second nonwoven fabric layer.

The second nonwoven layer is disposed on the first nonwoven layer.

The mulching spunbond nonwoven fabric has a light reflection coefficient r of 3 to 20 represented by Equation 1 below, and a light absorption coefficient a of 45 to 65 represented by Equation 2 below.

[Equation 1]

r (g / m ² ) = [(A * Y _A ) + (B * Y _B )] / 100

(Wherein A is the weight per unit area of the first nonwoven layer (g / m ² ), B is the weight per unit area of the second nonwoven layer (g / m ² ), and Y _A is the light reflectance of the first pigment component Value (%), Y _B is the light reflectance value (%) of the second pigment component)

[Equation 2]

a (g / m ² ) = [(A * X _A ) + (B * X _B )] / 100

(Wherein A is the weight per unit area of the first nonwoven fabric layer (g / m ² ), B is the weight per unit area of the second nonwoven fabric layer (g / m ² ), and X _A is the light absorption rate of the first pigment component Value (%) (100-Y _A ), and X _B is the light absorption value (%) (100-Y _B ) of the second pigment component).

If the light reflection coefficient r is less than 3, the fruit or fruit tree may not burn, but the fruit colorability may deteriorate. If the light reflection coefficient r exceeds 20, the herbicidal effect may deteriorate, the fruit and fruit may burn, or the economical efficiency may deteriorate.

In addition, if the light absorption coefficient (a) is less than 45, there is a geothermal rise prevention effect, but the herbicidal effect is worse, the fruit and fruit are burned or the economy is worsened. It can adversely affect the roots and inhibit the growth of fruit trees.

The weight ratio of the first nonwoven fabric layer to the second nonwoven fabric layer may be 10:90 to 90:10, for example, 25 to 75:75 to 25. When the weight ratio of the first nonwoven fabric layer to the second nonwoven fabric layer is within the range (10:90 to 90:10), it may be advantageous in terms of light reflection effect and herbicidal effect.

The first nonwoven fabric layer and the second nonwoven fabric layer may each include 0.1 to 1.5 parts by weight of an ultraviolet stabilizer based on 100 parts by weight of the total weight of each layer. If the content of the UV stabilizer is within the above range, it may be advantageous in terms of weather resistance, workability and manufacturing cost of the mulching spunbond nonwoven fabric.

The UV stabilizer can be prevented from using the spunbonded nonwoven fabric for mulching in the sun for a long time, so that the UV stabilizer can not be used due to the decrease in strength, so that the additional cost must be reinstalled.

1 is a photograph showing a deteriorated state of a spunbond nonwoven fabric for mulching that does not contain an ultraviolet light stabilizer.

The UV stabilizers include HALS (hindered amine light stabilizer), hydroxybenzophenone (e.g. 2-hydroxy-4-n-octoxy benzophenone), hydroxybenzotriazine, cyanoacrylate, oxanilide Benzoxazinone (e.g., 2,2 '-(1,4-phenylene) bis (4H-3,1-benzoxazin-4-one) commercially available from Cytec under the tradename CYASORB UV-3638) , Aryl salicylate, hydroxybenzotriazole (eg 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (2-hydroxy-5-tert-octylphenyl) benzotriazole And 2- (2H-benzotriazol-2-yl) -4- (1,1,3,3-tetramethylbutyl) -phenol, commercially available under the tradename CYASORB 5411 from Cytec, or combinations thereof It may include.

The first nonwoven fabric layer and the second nonwoven fabric layer may each include a propylene polymer having a melt index (MFR (Melt Flow Rate): measurement temperature of 230 ° C. and a load of 2.16 kg) of 20 to 80 g / 10 minutes.

The propylene-based polymer may include a propylene homopolymer, a propylene-ethylene copolymer, a propylene-ethylene-butylene terpolymer or a combination thereof.

The content of the ethylene unit component in the propylene-ethylene copolymer may be 10 to 30 mol%. When the content of the ethylene unit component in the propylene-ethylene copolymer is within the above range, a nonwoven fabric layer having excellent bulkiness and good flexibility can be obtained.

In the propylene-ethylene-butylene terpolymer, the content of the ethylene unit component may be greater than that of the butylene unit component, and the total content of the ethylene unit component and the butylene unit component may be 10 to 30 mol%. If the total content of ethylene unit components and butylene unit components in the propylene-ethylene-butylene terpolymer is within the above range, a nonwoven fabric layer having excellent bulkiness and good flexibility can be obtained.

The color of the first nonwoven fabric may be substantially the same as the color of the first pigment component.

The color of the first pigment component may be black, dark blue, or violet.

The color of the second nonwoven fabric may be substantially the same as the color of the second pigment component.

The color of the second pigment component may be BLUE, LIGHT BLUE, GRAY, LIGHT GRAY, PINK, YELLOW or LIGHT BLUE.

The mulching spunbond nonwoven fabric may have a total thickness of 0.1 to 1.0 mm.

In addition, the mulching spunbond nonwoven fabric may have a weight per unit area of 48 ~ 85g / m ² .

In addition, the mulching spunbond nonwoven fabric may have a water permeability (or absorbent). That is, the mulching spunbond nonwoven fabric may be treated with a hydrophilic agent.

Since the mulching spunbond nonwoven fabric has a water permeability, it can be soaked into the water by watering the upper portion of the mulching without removing it even after watering.

The spunbond nonwoven fabric for mulching may be a multilayer structure of a first nonwoven fabric layer / second nonwoven fabric layer, a three-layer structure of a first nonwoven fabric layer / a third nonwoven fabric layer / a second nonwoven fabric layer, or a first nonwoven fabric layer / third nonwoven fabric layer / the first It may have a four-layer structure of four nonwoven layers / second nonwoven layers.

The third nonwoven fabric layer and the fourth nonwoven fabric layer may each independently be the first nonwoven fabric layer, the second nonwoven fabric layer, or a separate nonwoven fabric layer other than the first nonwoven fabric layer and the second nonwoven fabric layer.

Although the number of the nonwoven fabric layers constituting the spunbond nonwoven fabric for mulching has an advantage of controlling the weight ratio of each layer in various ways, the investment cost of the equipment is too high.

Hereinafter, a method of manufacturing a spunbond nonwoven fabric for mulching according to an embodiment of the present invention will be described in detail.

Method for producing a spunbond nonwoven fabric for mulching according to an embodiment of the present invention comprises the following steps:

(a) 5 to 20 parts by weight of the UV stabilizer, 5 to 30 parts by weight of the first pigment component having a light reflectance value of 3 to 10%, and a melt index (MFR: measurement temperature 230 ° C., load 2.16 kg) of 20 to 80 g / 10 Preparing a first pigment master batch chip by melting 50 to 90 parts by weight of the first propylene-based polymer in a kneader;

(b) 5 to 20 parts by weight of the UV stabilizer, 5 to 30 parts by weight of the second pigment component having a light reflectance value of 30 to 50%, and a melt index (MFR: measurement temperature 230 ° C., load 2.16 kg) of 20 to 80 g / 10 Preparing a second pigment master batch chip by melting 50 to 90 parts by weight of a second propylene-based polymer in a kneader;

 (c) a third propylene polymer chip having a melt index (MFR: measurement temperature of 230 ° C. and a load of 2.16 kg) of 20 to 80 g / 10 minutes is introduced into a first extruder, and then the first pigment masterbatch is placed in the first extruder. Melting, mixing, and homogenizing chips to melt-spin through a spinneret, forming a filament through a cooling and stretching process, and then stacking them on a continuously moving porous conveyor belt to form a first nonwoven layer;

(d) a fourth propylene polymer chip having a melt index (MFR: measurement temperature of 230 ° C., a load of 2.16 kg) of 20 to 80 g / 10 minutes is introduced into a second extruder, and then the second pigment masterbatch is placed in the second extruder. Chips are melted, mixed and homogenized, melt spun through spinnerets, filaments are formed through cooling and stretching processes, and then laminated on the first nonwoven fabric layer formed on the continuously moving porous conveyor belt. Obtaining a nonwoven fabric having a multilayer structure by forming two nonwoven layers;

(e) transferring the nonwoven fabric of the multilayer structure to a calender and heat-bonding to impart shape stability; And

(f) applying a hydrophilic agent to the nonwoven fabric of the multi-layer structure and giving a water permeability.

The spinneret of each extruder may include two to five spin beams (SPIN BEAM).

The calendar may include an embossing roll having a bonding rate (embossing area ratio) of 10 to 30% on one side and a plate roll having a smooth surface on the other side.

In addition, the pressure of the calendar is 50 ~ 100 dyne / cm, the temperature may be 130 ~ 170 ℃.

By making each pigment master batch chip include both an UV stabilizer and a pigment component, the following advantages can be obtained: That is, the UV stabilizer is colorless and is prepared in a separate master batch form only with an propylene polymer. When it is mixed and melt-spun while continuously feeding the extruder at a ratio, even when the UV stabilizer is not supplied due to a breakdown of the metering device or the blockage of the raw material supply pipe, it cannot be confirmed. It may cause a fatal defect in the weather resistance of the propylene-based polymer. However, since each pigment master batch chip contains both an ultraviolet stabilizer and a pigment component, it can be visually confirmed that the ultraviolet stabilizer is not added when the pigment component is not added, so that appropriate measures can be taken.

The first propylene polymer, the second propylene polymer, the third propylene polymer and the fourth propylene polymer may be the same or different from each other.

If the melt index of each of the propylene-based polymer is within the above range, it may be advantageous in terms of workability when manufacturing the nonwoven fabric.

The hydrophilic agent may include a nonionic surfactant, cationic surfactant, anionic surfactant, amphoteric surfactant or a combination thereof.

The nonionic surfactant may have an average molecular weight of 300 to 5,000, for example, 500 to 3,000.

The nonionic surfactants include alcohol ethoxylates, ethoxysulfates, ethoxylated amines, fatty acid amides, fatty acid esters, glycerin fatty acid esters, glycerol mono stearate, glycerol mono laurate, sorbitan fatty acid esters, alkyl polyglucosides, amine oxides. , Sulfoxide, phosphine oxide, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitol fatty acid ester, polyoxyethylene glycerin fatty acid ester, poly Glycerin fatty acid esters, sucrose fatty acid esters, polyoxyethylene alkylamines, polyoxyethylene fatty acid amides, fatty acid alkylolamides, alkylalkanolamides, acetylene glycols, oxyethylene adducts of acetylene glycols, polyethylene Glycol propylene-based polymer glycol block copolymers or combinations thereof.

The cationic surfactants include dodecyltrimethylammonium acetate, trimethyltetradecylammonium chloride, hexadecyltrimethylammonium bromide, trimethyloctadecylammonium chloride, (dodecylmethylbenzyl) trimethylammonium chloride, benzyldodecyldimethylammonium chloride, methyldodecyldi (Hydropolyoxyethylene) ammonium chloride, benzyldodecyldi (hydropolyoxyethylene) ammonium chloride, N- [2- (diethylamino) ethyl] oleamide hydrochloride, dialkyl (reduced tallow) dimethylammonium chloride or combinations thereof It may include.

The anionic surfactants include dioctyl sodium sulfosuccinate (DIOCTYL SODIUM SULFOSUCCINATE), sodium lauryl sulfate, lauryl triethanolamine, sodium polyoxyethylene lauryl ether sulfate, sodium polyoxyethylene nonylphenyl ether sulfate, polyoxyethylene lauryl ether sulfate Triethanolamine, sodium cocoyl sarcosin, sodium N-cocoylmethyl taurate, sodium polyoxyethylene palm alkyl ether sulfate, sodium diethexyl sulfosuccinate, sodium α-olefin sulfonate, sodium lauryl phosphate, polyoxyethylene lauryl ether Sodium phosphate, perfluoroalkylcarboxylates, or combinations thereof.

The amphoteric surfactant is lauryl betaine, stearyl betaine, lauryl carboxymethyl hydroxyethyl imidazolium betaine, lauryl dimethyl amino acetate betaine, fatty acid amidopropyl dimethyl amino acetate betaine or combinations thereof It may include.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

Example 1

First, 15 parts by weight of a HALS UV stabilizer, 20 parts by weight of carbon black having a light reflectance value of 3%, and 65 parts by weight of a propylene homopolymer having a melt index (MFR: measurement temperature of 230 ° C. and a load of 2.16 kg) of 35 g / 10 min. It melted and manufactured the 1st pigment master batch chip.

Thereafter, 15 parts by weight of the HALS-based UV stabilizer, 20 parts by weight of a LIGHT BLUE pigment having a light reflectance value of 36%, and a propylene homopolymer 65 having a melt index (MFR: measurement temperature of 230 ° C. and a load of 2.16 kg) of 35 g / 10 minutes. The weight part was melted with a kneader to prepare a second pigment master batch chip.

Thereafter, the propylene homopolymer chip and the first pigment master batch chip having a melt index (MFR: measurement temperature of 230 ° C., load of 2.16 kg) of 35 g / 10 min were continuously continuously fed at a ratio of 97: 3 by weight in the first extruder. Melted, mixed and homogenized, melt-spun through the spinneret, cooled with cooling air, drawn into the suction air at the bottom of the conveyor belt to form a filament with 2.5 denier fineness, and then on a continuously moving porous conveyor belt. The first nonwoven fabric layer was formed by laminating in a web form.

Thereafter, the propylene homopolymer chip and the second pigment master batch chip having a melt index (MFR: measurement temperature of 230 ° C., a load of 2.16 kg) of 35 g / 10 min were continuously continuously fed in a ratio of 97: 3 by weight to the second extruder. The porous conveyor belt which is melted, mixed and homogenized, melt-spun through the spinneret, cooled with cooling air and drawn into the suction air at the bottom of the conveyor belt to form a filament having a fineness of 2.5 denier, and then continuously moves to the porous conveyor belt. The nonwoven fabric of the multilayer structure was obtained by laminating on the said 1st nonwoven fabric layer formed on this, and forming a 2nd nonwoven fabric layer.

Thereafter, the multi-layered nonwoven fabric was transferred to a calender composed of an emboss roll and a plate roll, and then thermally bonded to give a shape stability. Thereafter, a hydrophilic agent (DIOCTYL SODIUM SULFOSUCCINATE) was applied to the nonwoven fabric of the multilayer structure to impart water permeability. As a result, a spunbond nonwoven fabric for mulching having a weight per unit area of 60 g / m ² and a weight ratio of the first nonwoven fabric layer to the second nonwoven fabric layer was 75:25. The weight per unit area and the weight ratio of the first nonwoven fabric layer to the second nonwoven fabric layer, the light reflection coefficient (r) calculated according to Equation 1 and the light absorption coefficient (a) calculated according to Equation 2 are shown in Table 1 below. It was.

Example 2

A mulching spunbond nonwoven fabric was manufactured in the same manner as in Example 1, except that the weight ratio of the first nonwoven fabric layer to the second nonwoven fabric layer was changed to 50:50.

Example 3

Mulching in the same manner as in Example 1, except that the content of each component was increased so that the weight per unit area was 65 g / m ² and the weight ratio of the first nonwoven fabric layer to the second nonwoven fabric layer was changed to 68: 361. A spunbond nonwoven fabric was prepared.

Example 4

Mulching in the same manner as in Example 1, except that the content of each component was increased so that the weight per unit area was 70 g / m ² and the weight ratio of the first nonwoven fabric layer to the second nonwoven fabric layer was changed to 202: 29. A spunbond nonwoven fabric was prepared.

Comparative Example 1

Except for changing the weight ratio of the first nonwoven fabric layer to the second nonwoven fabric layer to 50:50 using carbon black instead of the LIGHT BLUE pigment having a light reflectance value of 36% in manufacturing the second pigment master batch chip. Was manufactured in the same manner as in Example 1 for the mulching spunbond nonwoven fabric.

Comparative Example 2

The weight ratio of the first nonwoven fabric layer to the second nonwoven fabric layer using a white pigment having a light reflectance value of 93% instead of a LIGHT BLUE pigment having a light reflectance value of 36% in the manufacture of the second pigment master batch chip. A mulching spunbond nonwoven fabric was manufactured in the same manner as in Example 1, except that 50 was changed to 50:50.

Comparative Example 3

The same method as in Example 1, except that a white pigment having a light reflectance value of 93% was used instead of a LIGHT BLUE pigment having a light reflectance value of 36% in the manufacture of the second pigment master batch chip. A spunbonded nonwoven fabric for mulching was prepared.

Comparative Example 4

The weight ratio of the first nonwoven fabric layer to the second nonwoven fabric layer using a white pigment having a light reflectance value of 93% instead of a LIGHT BLUE pigment having a light reflectance value of 36% in the manufacture of the second pigment master batch chip. A mulching spunbond nonwoven fabric was manufactured in the same manner as in Example 1, except that was changed to 25:75.

Comparative Example 5

Increase the content of each component so that the weight per unit area is 80 g / m ² and white light reflectance value of 93% instead of LIGHT BLUE pigment with 36% light reflectance value in the manufacture of the second pigment master batch chip. A spunbonded nonwoven fabric for mulching was prepared in the same manner as in Example 1, except that the (WHITE) pigment was used.

Comparative Example 6

Increase the content of each component so that the weight per unit area is 80 g / m ² and white light reflectance value of 93% instead of LIGHT BLUE pigment with 36% light reflectance value in the manufacture of the second pigment master batch chip. A spunbond nonwoven fabric for mulching was prepared in the same manner as in Example 1, except that the (WHITE) pigment was used and the weight ratio of the first nonwoven fabric layer to the second nonwoven fabric layer was changed to 50:50.

Comparative Example 7

Increase the content of each component so that the weight per unit area is 80 g / m ² and white light reflectance value of 93% instead of LIGHT BLUE pigment with 36% light reflectance value in the manufacture of the second pigment master batch chip. A spunbond nonwoven fabric for mulching was prepared in the same manner as in Example 1, except that the (WHITE) pigment was used and the weight ratio of the first nonwoven fabric layer to the second nonwoven fabric layer was changed to 25:75.

Weight per unit area (g / m ² ) Color of pigment component Weight ratio (part by weight) Light reflection coefficient (r)
(g / m ² ) Light absorption coefficient (a)
(g / m ² ) First pigment component Second pigment component First nonwoven fabric layer Second nonwoven fabric layer Example 1 60 black Light blue 75 25 6.8 53.3 Example 2 60 black Light blue 50 50 11.7 48.3 Example 3 65 black Light blue 68 361 20.0 45.0 Example 4 70 black Light blue 202 29 5.0 65.0 Comparative Example 1 60 black black 50 50 1.8 58.2 Comparative Example 2 60 black White 50 50 28.8 31.2 Comparative Example 3 60 black White 75 25 15.3 44.7 Comparative Example 4 60 black White 25 75 42.3 17.7 Comparative Example 5 80 black White 75 25 20.4 59.6 Comparative Example 6 80 black White 50 50 38.4 41.6 Comparative Example 7 80 black White 25 75 56.4 23.6

Evaluation example

Physical properties of the mulching spunbond nonwoven fabrics prepared in Examples 1 to 4 and Comparative Examples 1 to 7 were measured by the following method, and the results are shown in Table 2 below.

Evaluation Example 1: Evaluation of Color and Light Reflectance Values of Each Nonwoven Layer

In each of the mulching spunbond nonwoven fabrics, the color and light reflectance values of the first nonwoven fabric layer and the color and light reflectance values of the second nonwoven fabric layer were compared with those of the color chart of FIG. 2. FIG. 2 is a color chart showing the light reflectance values of 20 colors and each color measured according to the British Standard BS8493: 2008 + A1: 2010.

Evaluation Example 2: Evaluation of the herbicidal effect, geothermal rise prevention effect, fruit coloring property, fruit / fruit burn prevention effect and economical efficiency (installation cost) of the whole nonwoven fabric

The mulching spunbonded nonwoven fabric for each mulching is continuously observed until harvested after mulching in an orchard as shown in FIGS. Installation costs) were evaluated in three grades as follows.

◎: Excellent, ○: Normal, X: Poor

color Light reflectance value (%) Weeding
effect Geothermal rise
Prevention
effect fruit
Coloring Fruit / Fruit
Burn prevention Economic feasibility (installation cost) First nonwoven fabric layer Second nonwoven fabric layer First nonwoven fabric layer Second nonwoven fabric layer Example 1 black Light blue 3 36 ◎ ◎ ◎ ◎ ◎ Example 2 black Light blue 3 36 ◎ ◎ ◎ ◎ ◎ Example 3 black Light blue 3 36 ◎ ◎ ◎ ◎ ◎ Example 4 black Light blue 3 36 ◎ ◎ ◎ ◎ ◎ Comparative Example 1 black black 3 3 ◎ ○ X ◎ ◎ Comparative Example 2 black White 3 93 X ◎ ◎ ○ ◎ Comparative Example 3 black White 3 93 X ◎ ◎ ○ ◎ Comparative Example 4 black White 3 93 X ◎ ◎ ○ ◎ Comparative Example 5 black White 3 93 ○ ◎ ◎ X X Comparative Example 6 black White 3 93 ○ ◎ ◎ X X Comparative Example 7 black White 3 93 ○ ◎ ◎ X X

Referring to Table 2, the color and light reflectance values of the first nonwoven fabric in the mulching spunbond nonwoven fabrics manufactured in Examples 1 to 4 and Comparative Examples 1 to 7 are respectively the color and the light reflectance of the first pigment component. It was found that the values were substantially the same, and that the color and light reflectance values of the second nonwoven fabric were substantially the same as the color and light reflectance values of the second pigment component, respectively.

In addition, each of the mulching spunbond nonwoven fabric prepared in Examples 1 to 4 was excellent in herbicidal effect, geothermal rise prevention effect, fruit coloring, fruit / fruit burn prevention effect and economic efficiency (installation cost). On the other hand, each of the mulching spunbond nonwoven fabric prepared in Comparative Examples 1 to 7 was found that at least one of the herbicidal effect, geothermal rise prevention effect, fruit coloring, fruit / fruit burn prevention effect and economical efficiency (installation cost) is less than normal. .

Although the present invention has been described with reference to the drawings and embodiments, these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (12)

A first nonwoven fabric layer containing a first pigment component having a light reflectance value of 3 to 10%; And
A second nonwoven layer disposed on the first nonwoven layer and containing a second pigment component having a light reflectance value of 30 to 50%,
The light reflection coefficient r represented by the following formula 1 is 3 to 20,
Light absorption coefficient (a) represented by the following formula (2) is 45 ~ 65,
The first nonwoven fabric layer and the second nonwoven fabric layer is a mulching spunbond nonwoven fabric containing 0.1 to 1.5 parts by weight of a UV stabilizer, respectively, based on 100 parts by weight of the total weight of each layer:
[Equation 1]
r (g / m ² ) = [(A * Y _A ) + (B * Y _B )] / 100
(Wherein A is the weight per unit area of the first nonwoven layer (g / m ² ), B is the weight per unit area of the second nonwoven layer (g / m ² ), and Y _A is the light reflectance of the first pigment component Value (%), Y _B is the light reflectance value (%) of the second pigment component)
[Equation 2]
a (g / m ² ) = [(A * X _A ) + (B * X _B )] / 100
(Wherein A is the weight per unit area of the first nonwoven fabric layer (g / m ² ), B is the weight per unit area of the second nonwoven fabric layer (g / m ² ), and X _A is the light absorption rate of the first pigment component Value (%) (100-Y _A ), and X _B is the light absorption value (%) (100-Y _B ) of the second pigment component). The method of claim 1,
A spunbond nonwoven fabric for mulching wherein the weight ratio of the first nonwoven fabric layer to the second nonwoven fabric layer is 25 to 75:75 to 25. delete The method of claim 1,
The first nonwoven fabric layer and the second nonwoven fabric layer is a mulching spunbond nonwoven fabric comprising a propylene polymer having a melt index (MFR: measurement temperature 230 ℃, load 2.16kg) of 20 ~ 80g / 10 minutes. The method of claim 4, wherein
The propylene-based polymer is a spunbond nonwoven fabric for mulching comprising a propylene homopolymer, propylene-ethylene copolymer, propylene-ethylene-butylene terpolymer or a combination thereof. The method of claim 1,
The color of the first nonwoven fabric is the same as the color of the first pigment component, the color of the first pigment component is black (BLACK), DARK BLUE or purple (VIOLET) mulching spunbond nonwoven fabric. The method of claim 1,
The color of the second nonwoven fabric is the same as the color of the second pigment component, the color of the second pigment component is BLUE, LIGHT BLUE, GRAY, LIGHT GRAY, pink Spunbonded nonwoven fabric for mulching in (PINK), YELLOW or LIGHT BLUE. The method of claim 1,
Mulching spunbond nonwoven fabric with a total thickness of 0.1 ~ 1.0mm. The method of claim 1,
Spunbonded nonwoven fabric for mulching with a weight of 48 to 85 g / m ² per unit area. The method of claim 1,
Permeable spunbond nonwoven fabric with permeability. delete delete

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