KR20210147407A - Spunbond nonwoven fabric for mulching and method of preparing the same - Google Patents

Abstract

Disclosed are a spunbonded nonwoven fabric for mulching, which does not cause eye fatigue during use, and a manufacturing method thereof. According to the present invention, the spunbonded nonwoven fabric for mulching comprises: 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 11 to 20%.

Description

Spunbond nonwoven fabric for mulching and manufacturing method thereof

Disclosed are a spunbond nonwoven fabric for mulching and a method for manufacturing the same. More specifically, the color of the inner surface is black-based, which effectively suppresses the growth of weeds, while the color of the outer surface exposed to the outside is composed of a color similar to that of seedlings and soil, so that it does not cause any aesthetic problems. Disclosed are a spunbond nonwoven fabric for mulching for weed suppression that does not cause fatigue, and a method for manufacturing the same.

Products for agricultural mulching that suppress weed growth so that nutrients in the soil are supplied to fruit trees, etc. have been supplied.

As an example, the black nonwoven fabric for mulching of "nonwoven fabric for preventing soil acidification and inhibiting weed growth" (Korea Patent Publication No. 10-0248939) showed an excellent weeding effect, but both sides of the nonwoven fabric were black, so there was an aesthetic problem. have.

As another example, the nonwoven fabric for mulching of "Multilayer structure polypropylene spunbond nonwoven fabric for mulching and its manufacturing method" (Korea Patent No. 10-0742962) has a black nonwoven layer facing the soil, and a white nonwoven layer facing the outside. Compared to the existing black nonwoven fabric, it was designed to suppress the rise of geothermal heat, but the effect of suppressing the rise in geothermal heat was insignificant and the reflectivity was large, so there was a problem that the fatigue of the eyes during agricultural work increased.

[Prior art literature]

[Patent Literature]

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 layer having a light reflectance value of 3 to 10% and a second nonwoven layer having a light reflectance value of 11 to 20%.

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

One aspect of the present invention is

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

A second nonwoven fabric layer containing a second pigment component having a light reflectance value of 11 to 20% as disposed on the first nonwoven fabric layer,

The light reflection coefficient (r) represented by the following Equation 1 is 3 to 20,

The light absorption coefficient (a) represented by the following Equation 2 provides a spunbond nonwoven fabric for mulching of 68 to 80:

[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 (%), and 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 layer (g/m ² ), B is the weight per unit area of the second nonwoven 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 (%) of the second pigment component (100-Y _B )).

The weight ratio of the first nonwoven fabric layer to the second nonwoven fabric layer may be 5 to 95:95 to 5.

The first nonwoven fabric layer and the second nonwoven fabric layer may each contain 0.1 to 1.5 parts by weight of a UV stabilizer based on 100 parts by weight of the total weight of each layer.

Each of the first nonwoven layer and the second nonwoven layer may include a propylene-based polymer having a melt index (MFR: measured temperature of 230° C., load of 2.16 kg) of 20 to 80 g/10 min.

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 the color of the first pigment component, and the color of the first pigment component may be black.

The color of the second nonwoven fabric may be the same as the color of the second pigment component, and the color of the second pigment component may be dark brown.

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

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

The spunbond nonwoven fabric for mulching may have water permeability.

Another aspect of the present invention is

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

5 to 20 parts by weight of a UV stabilizer, 5 to 30 parts by weight of a second pigment component having a light reflectance value of 11 to 20%, a second having a melt index (MFR: measured temperature 230° C., load 2.16 kg) of 20 to 80 g/10 min. Preparing a second pigment master batch chip by melting 50 to 90 parts by weight of a propylene-based polymer with a kneader;

Melt index (MFR: measured temperature 230 ℃, load 2.16kg) of 20 ~ 80g / 10 minutes of the third propylene-based polymer chip was put into the first extruder, and then the first pigment master batch chip was put into the first extruder to melt, mix, and homogenize, melt-spun through a spinneret, cool and stretch to form filaments, and then laminate on a continuously moving porous conveyor belt to form a first nonwoven layer;

A fourth propylene-based polymer chip having a melt index (MFR: measured temperature 230° C., load 2.16 kg) of 20 to 80 g/10 min was put into the second extruder, and then the second pigment master batch chip was put into the second extruder. to melt, mix, and homogenize, melt-spun through a spinneret, cool and stretch to form a filament, and then laminate on the first nonwoven layer formed on the continuously moving porous conveyor belt obtaining a nonwoven fabric having a multilayer structure by forming a;

transferring the nonwoven fabric of the multilayer structure to a calender and then thermally bonding the nonwoven fabric to impart shape stability; and

It provides a method of manufacturing a spunbond nonwoven fabric for mulching comprising the step of imparting water permeability by applying and drying a hydrophilic agent to the nonwoven fabric of the multilayer structure.

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

The spunbond nonwoven fabric for mulching according to an embodiment of the present invention improves the colorability of fruits without reducing the weeding effect, prevents burns of the fruit tree due to overreflection of light, improves soil similarity, and absorbs light It has the advantage of not inhibiting the growth of fruit trees by adversely affecting the roots due to the increase in geothermal temperature due to heat storage in the nonwoven fabric.

However, the 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 the deterioration state of a mulching spunbond nonwoven fabric that does not contain a UV stabilizer.
2 is a color chart used to confirm the light reflectance values of the spunbond nonwoven fabrics prepared in Examples 1 to 5 and Comparative Examples 1 to 6;
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, "light reflectance value" means the total amount of visible and available light reflected by a surface at all wavelengths in all directions when light is irradiated, and the light reflectance referred to herein Values are measured according to British Standard BS8493:2008+A1:2010.

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

The first nonwoven fabric layer may contain a first pigment component having a light reflectance value of 3 to 10%.

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

In addition, the second nonwoven fabric layer may contain a second pigment component having a light reflectance value of 11 to 20%.

The spunbond nonwoven fabric for mulching has a light reflection coefficient (r) of 3 to 20, expressed by Equation 1 below, and a light absorption coefficient (a) expressed by Equation 2 below, of 68 to 80.

[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 (%), and 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 layer (g/m ² ), B is the weight per unit area of the second nonwoven 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 (%) of the second pigment component (100-Y _B )).

If the light reflection coefficient (r) is less than 3, the fruit or fruit tree does not burn, but fruit colorability and soil similarity deteriorate, and when the light reflection coefficient (r) is more than 20, the herbicidal effect may deteriorate, or the fruit and fruit tree may suffer burns or economic feasibility may deteriorate. For example, the light reflection coefficient r may be 3-10.

In addition, if the light absorption coefficient (a) is less than 68, there is an effect of preventing geothermal rise, fruit colorability and economic efficiency, but at least one of weeding effect and soil similarity deteriorates, and if it exceeds 80, fruit colorability, soil similarity and economic efficiency deteriorate. In addition, the increase in geothermal temperature due to heat storage in the non-woven fabric can adversely affect the roots of the fruit tree, inhibiting the growth of the fruit tree.

The weight ratio of the first nonwoven fabric layer to the second nonwoven fabric layer may be 5:95 to 95:5, for example, 6 to 94:87-13. When the weight ratio of the first non-woven fabric layer to the second non-woven fabric layer is within the above range (5:95 to 95:5), it may be advantageous in terms of light reflection effect and weeding effect.

The first nonwoven fabric layer and the second nonwoven fabric layer may each contain 0.1 to 1.5 parts by weight of a UV stabilizer based on 100 parts by weight of the total weight of each layer. When 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 spunbond nonwoven fabric for mulching.

The UV stabilizer does not become impossible to use due to a decrease in strength even when the spunbond nonwoven fabric for mulching is used in sunlight for a long period of time, so it is possible to prevent the problem of having to reinstall it at an additional cost.

1 is a photograph showing the deterioration state of a mulching spunbond nonwoven fabric that does not contain a UV stabilizer.

The ultraviolet stabilizer is a hindered amine light stabilizer (HALS), hydroxybenzophenone (eg, 2-hydroxy-4-n-octoxy benzophenone), hydroxybenzotriazine, cyanoacrylate, oxanilide , benzoxazinone (eg, 2,2′-(1,4-phenylene)bis(4H-3,1-benzoxazin-4-one, commercially available from Cytec under the trade name 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 from Cytec under the trade designation CYASORB 5411) or a combination thereof may include

Each of the first nonwoven layer and the second nonwoven layer may include a propylene-based polymer having a melt index (MFR (Melt Flow Rate): measured temperature of 230°C, load of 2.16 kg) of 20 to 80 g/10 min.

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 is greater than the content of the butylene unit component, but the total content of the ethylene unit component and the butylene unit component may be 10 to 30 mol%. When the total content of the ethylene unit component and the butylene unit component 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.

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 dark brown.

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

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

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

Since the spunbond nonwoven fabric for mulching has water permeability, water can permeate into its interior by irrigating the upper part without removing it even when irrigated after mulching.

The spunbond nonwoven fabric for mulching is a multilayer structure of a first nonwoven fabric layer / a 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 / a third nonwoven fabric layer / It may have a 4-layer structure of 4 non-woven fabric layers/second non-woven fabric layers.

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

As the number of nonwoven layers constituting the spunbond nonwoven fabric for mulching increases, there is an advantage that the weight ratio of each layer can be variously adjusted, but there is a disadvantage that the investment cost of the equipment is too high.

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

A method for manufacturing a spunbond nonwoven fabric for mulching according to an embodiment of the present invention includes the following steps:

(a) 5 to 20 parts by weight of 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: measured 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 powder in a kneader;

(b) 5 to 20 parts by weight of a UV stabilizer, 5 to 30 parts by weight of a second pigment component having a light reflectance value of 11 to 20%, and a melt index (MFR: measured 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 powder with a kneader;

(c) melt index (MFR: measured temperature 230 ° C., load 2.16 kg) of 20 ~ 80 g / 10 minutes of the third propylene-based polymer chip was put into the first extruder, and then the first pigment master batch in the first extruder The chips are melted, mixed and homogenized, melt-spun through a spinneret, cooled and stretched to form filaments, and then laminated on a continuously moving porous conveyor belt to form a first nonwoven layer;

(d) Melt index (MFR: measured temperature 230 ° C., load 2.16 kg) of 20 to 80 g / 10 min of the fourth propylene-based polymer chip was put into the second extruder, and then the second pigment master batch was put into the second extruder. The chips are melted, mixed and homogenized, melt-spun through a spinneret, cooled and stretched to form filaments, and then laminated on the first non-woven fabric layer formed on the continuously moving porous conveyor belt. 2 obtaining a nonwoven fabric having a multilayer structure by forming a nonwoven fabric layer;

(e) transferring the nonwoven fabric of the multi-layer structure to a calender and then thermally bonding to impart shape stability; and

(f) applying a hydrophilic agent to the nonwoven fabric of the multilayer structure and drying to impart water permeability.

The spinneret of each extruder may include 2 to 5 spin beams (SPIN BEAM).

The calender 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 calender is 50 ~ 100 dyne / cm, the temperature may be 130 ~ 170 ℃.

By making each of the pigment master batch chips include both the UV stabilizer and the pigment component, the following advantages can be obtained: that is, the UV stabilizer is colorless, and only the UV stabilizer is prepared in a separate master batch form and is prescribed together with a propylene-based polymer. When mixing and melt spinning while continuously supplying to the extruder in a ratio, it cannot be confirmed even if the UV stabilizer is not supplied due to a failure of the metering device or clogging of the raw material supply pipe, etc. It can cause fatal defects in the weather resistance of the propylene-based polymer. However, since each of the pigment master batch chips includes both the UV stabilizer and the pigment component, it can be visually confirmed that the UV stabilizer is not added when the pigment component is not added, so that appropriate measures can be taken.

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

If the melt index of each of the propylene-based polymers 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, a cationic surfactant, an anionic surfactant, an 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 surfactant is alcohol ethoxylate, ethoxysulfate, ethoxylated amine, fatty acid amide, fatty acid ester, glycerin fatty acid ester, glycerol monostearate, glycerol monolaurate, sorbitan fatty acid ester, alkyl polyglucoside, amine oxide , 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 ester, sucrose fatty acid ester, polyoxyethylene alkylamine, polyoxyethylene fatty acid amide, fatty acid alkylolamide, alkyl alkanolamide, acetylene glycol, oxyethylene adduct of acetylene glycol, polyethylene glycol propylene polymer glycol block copolymer or a combination thereof.

The cationic surfactant is 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 a combination thereof may include

The anionic surfactant is dioctyl sodium sulfosuccinate (DIOCTYL SODIUM SULFOSUCCINATE), sodium lauryl sulfate, triethanolamine lauryl sulfate, sodium polyoxyethylene lauryl ether sulfate, sodium polyoxyethylene nonylphenyl ether sulfate, polyoxyethylene lauryl ether sulfate Triethanolamine, sodium cocoyl sarcosine, sodium N-cocoylmethyl taurate, sodium polyoxyethylene palm alkyl ether sulfate, sodium dietherhexyl 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, laurylcarboxymethylhydroxyethylimidazolium betaine, lauryldimethylaminoacetic acid betaine, fatty acid amidopropyldimethylaminoacetic acid betaine, or a combination thereof. 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-based 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 230° C., load 2.16 kg) of 35 g/10 min by kneading machine A first pigment master batch chip was prepared by melting.

Then, 15 parts by weight of a HALS-based UV stabilizer, 20 parts by weight of a dark brown (DARK BROWN) pigment having a light reflectance value of 12%, a propylene homopolymer 65 having a melt index (MFR: measured temperature 230° C., load 2.16 kg) of 35 g/10 min. A second pigment master batch chip was prepared by melting parts by weight with a kneader.

Thereafter, the propylene homopolymer chips and the first pigment master batch chips having a melt index (MFR: measurement temperature 230° C., load 2.16 kg) of 35 g/10 minutes were automatically continuously fed to the first extruder at a ratio of 97: 3 by weight. melted, mixed, and homogenized, melt-spun through a spinneret, cooled with cooling air, and stretched with the lower intake air of the conveyor belt to form a filament with a fineness of 2.5 denier, then on a continuously moving porous conveyor belt was laminated in a web form to form a first nonwoven fabric layer.

Thereafter, the propylene homopolymer chips and the second pigment master batch chips having a melt index (MFR: measured temperature 230° C., load 2.16 kg) of 35 g/10 minutes were automatically continuously fed to a second extruder at a ratio of 97: 3 by weight. The porous conveyor belt continuously moves after melting, mixing, and homogenizing, melt spinning through a spinneret, cooling with cooling air, and stretching with the lower intake air of the conveyor belt to form a filament having a fineness of 2.5 denier A nonwoven fabric having a multilayer structure was obtained by laminating on the first nonwoven fabric layer formed thereon to form a second nonwoven fabric layer.

Thereafter, the nonwoven fabric of the multilayer structure was transferred to a calender composed of an emboss roll and a plate roll, and then thermally bonded to give shape stability. Thereafter, a hydrophilic agent (dioctyl sodium sulfosuccinate (DIOCTYL SODIUM SULFOSUCCINATE)) was applied to the nonwoven fabric of the multilayer structure and dried to give water permeability. As a result, a spunbond nonwoven fabric for mulching was obtained with a weight per unit area of 75 g/m ² and a weight ratio of the first nonwoven layer to the second nonwoven layer of 53:47. Table 1 below shows the total weight per unit area and the weight ratio of the first nonwoven layer to the second nonwoven layer, the light reflection coefficient (r) calculated according to Equation 1, and the light absorption coefficient (a) calculated according to Equation 2 it was

Example 2

A spunbond nonwoven fabric for mulching was prepared 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 87:13.

Example 3

Mulching was carried out in the same manner as in Example 1, except that the content of each component was increased so that the total weight per unit area was 85 g/m ^{2 and the weight ratio of the first nonwoven layer to the second nonwoven layer was changed to 6:94.} A spunbond nonwoven fabric was prepared.

Example 4

Mulching was carried out in the same manner as in Example 1, except that the content of each component was reduced so that the total weight per unit area was 74 g/m ^{2 and the weight ratio of the first nonwoven layer to the second nonwoven layer was changed to 47:53.} A spunbond nonwoven fabric was prepared.

Example 5

Mulching was carried out in the same manner as in Example 1, except that the content of each component was increased so that the total weight per unit area was 85 g/m ^{2 and the weight ratio of the first nonwoven layer to the second nonwoven layer was changed to 55:45.} A spunbond nonwoven fabric was prepared.

Comparative Example 1

For mulching in the same manner as in Example 1, except that carbon black having a light reflectance value of 3% was used instead of a dark brown (DARK BROWN) pigment having a light reflectance value of 12% during the manufacture of the second pigment master batch chip A spunbond nonwoven fabric was prepared.

Comparative Example 2

The same method as in Example 1, except that a WHITE pigment having a light reflectance value of 93% was used instead of a DARK BROWN pigment having a light reflectance value of 12% in the manufacture of the second pigment master batch chip A spunbond nonwoven fabric for mulching was prepared.

Comparative Example 3

The same method as in Example 1, except that a GREEN pigment having a light reflectance value of 24% was used instead of a DARK BROWN pigment having a light reflectance value of 12% in the manufacture of the second pigment master batch chip A spunbond nonwoven fabric for mulching was prepared.

Comparative Example 4

Carbon having a light reflectance value of 3% instead of a DARK BROWN pigment having a light reflectance value of 12% when the content of each component is increased so that the total weight per unit area becomes 160 g/m ^{2 and the second pigment master batch chip is manufactured} A spunbond nonwoven fabric for mulching was prepared in the same manner as in Example 1, except that black was used and the weight ratio of the first nonwoven layer to the second nonwoven layer was changed to 50:50.

Comparative Example 5

A spunbond nonwoven fabric for mulching was prepared 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 95:5.

Comparative Example 6

Mulching was carried out in the same manner as in Example 1, except that the content of each component was increased so that the total weight per unit area was 85 g/m ^{2 and the weight ratio of the first nonwoven layer to the second nonwoven layer was changed to 95:5.} A spunbond nonwoven fabric was prepared.

Total weight per unit area (g/m ² ) color of pigment Weight ratio (parts by weight) light reflection coefficient (r)
(g/m ² ) light absorption coefficient (a)
(g/m ² ) first pigment component second pigment component first nonwoven layer second nonwoven layer Example 1 75 black bitumen 53 47 5.4 69.6 Example 2 75 black bitumen 87 13 3.1 71.9 Example 3 85 black bitumen 6 94 9.7 75.3 Example 4 74 black bitumen 47 53 5.7 68.2 Example 5 85 black bitumen 55 45 6.0 79.0 Comparative Example 1 75 black black 53 47 2.3 72.8 Comparative Example 2 75 black White 53 47 34.0 41.0 Comparative Example 3 75 black green 53 47 9.7 65.3 Comparative Example 4 160 black black 50 50 4.8 155.2 Comparative Example 5 75 black bitumen 95 5 2.6 72.4 Comparative Example 6 85 black bitumen 95 5 3.3 82.0

evaluation example

Physical properties were measured in the following manner using each of the mulching spunbond nonwoven fabrics prepared in Examples 1 to 5 and Comparative Examples 1 to 6, and the results are shown in Table 2 below.

Evaluation Example 1: Evaluation of color and light reflectance values of each nonwoven fabric layer

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

Evaluation Example 2: Evaluation of weeding effect, geothermal rise prevention effect, fruit colorability, soil similarity and economic feasibility (installation cost) of the entire nonwoven fabric

As shown in FIGS. 3a and 3b, each of the spunbond nonwoven fabrics for mulching is mulched in an orchard and then continuously observed until harvest to determine the herbicidal effect, geothermal rise prevention effect, fruit colorability, soil similarity and economic feasibility (installation cost). Each was evaluated in three grades as shown. Here, the soil similarity refers to the degree to which a sense of incongruity is felt compared to the color of the soil when the nonwoven fabric is applied on the soil to be used for agricultural mulching. In fact, non-woven fabrics are being sold to farms by appealing to the eco-friendliness expressed with the naked eye.

◎: Excellent, ○: Average, X: Poor

color Light Reflectance Value (%) weeding
effect geothermal rise
Prevention
effect fruit
colorability Soil similarity Economical (installation cost) first nonwoven layer second nonwoven layer first nonwoven layer second nonwoven layer Example 1 black bitumen 3 12 ◎ ◎ ◎ ◎ ◎ Example 2 black bitumen 3 12 ◎ ◎ ◎ ◎ ◎ Example 3 black bitumen 3 12 ◎ ◎ ◎ ◎ ◎ Example 4 black bitumen 3 12 ◎ ◎ ◎ ◎ ◎ Example 5 black bitumen 3 12 ◎ ◎ ◎ ◎ ◎ Comparative Example 1 black black 3 3 ◎ ○ X X ◎ Comparative Example 2 black White 3 93 X ◎ ◎ X ◎ Comparative Example 3 black green 3 24 ◎ ◎ ◎ X ◎ Comparative Example 4 black black 3 3 ◎ ○ X X X Comparative Example 5 black bitumen 3 12 ◎ ◎ ◎ X ◎ Comparative Example 6 black bitumen 3 12 ◎ ◎ ◎ X ◎

Referring to Table 2, the color and light reflectance values of the first nonwoven fabric in each of the mulching spunbond nonwoven fabrics prepared in Examples 1 to 5 and Comparative Examples 1 to 6 are the color and light reflectance of the first pigment component, respectively. values, and the color and light reflectance values of the second nonwoven fabric were found to be substantially equal to the color and light reflectance values of the second pigment component, respectively.

In addition, each of the spunbond nonwoven fabrics for mulching prepared in Examples 1 to 4 were excellent in weeding effect, geothermal increase prevention effect, fruit colorability, soil similarity and economic feasibility (installation cost). On the other hand, each of the spunbond nonwoven fabrics for mulching prepared in Comparative Examples 1 to 6 showed that at least one of the herbicidal effect, the geothermal increase prevention effect, the fruit coloring property, the soil similarity, and the economic feasibility (installation cost) was below average.

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. Accordingly, the true technical protection scope of the present invention should be determined 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 fabric layer containing a second pigment component having a light reflectance value of 11 to 20% as disposed on the first nonwoven fabric layer,
The light reflection coefficient (r) represented by the following Equation 1 is 3 to 20,
The light absorption coefficient (a) represented by the following Equation 2 is 68 to 80 spunbond nonwoven fabric for mulching:
[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 (%), and 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 layer (g/m ² ), B is the weight per unit area of the second nonwoven 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 (%) of the second pigment component (100-Y _B )). According to claim 1,
The weight ratio of the first non-woven fabric layer to the second non-woven fabric layer is 5 to 95: 95 to 5 of the spunbond nonwoven fabric for mulching. According to claim 1,
The first non-woven fabric layer and the second non-woven fabric layer is a spunbond nonwoven fabric for mulching containing 0.1 to 1.5 parts by weight of a UV stabilizer based on 100 parts by weight of the total weight of each layer. According to claim 1,
The first nonwoven fabric layer and the second nonwoven fabric layer each have a melt index (MFR: measured temperature 230°C, load 2.16kg) of 20 to 80 g/10 min. 5. The method of claim 4,
The propylene-based polymer is a propylene homopolymer, a propylene-ethylene copolymer, a propylene-ethylene-butylene terpolymer, or a spunbond nonwoven fabric for mulching comprising a combination thereof. According to claim 1,
The color of the first nonwoven fabric is the same as the color of the first pigment component, and the color of the first pigment component is black (BLACK). According to claim 1,
The color of the second nonwoven fabric is the same as the color of the second pigment component, and the color of the second pigment component is dark brown (DARK BROWN). According to claim 1,
Spunbond non-woven fabric for mulching with a total thickness of 0.1 to 1.0 mm. According to claim 1,
Spunbond nonwoven fabric for mulching with a total weight per unit area of 48 to 85 g/m ^{2 .} According to claim 1,
Spunbond nonwoven fabric for mulching with water permeability. 5 to 20 parts by weight of UV stabilizer, 5 to 30 parts by weight of the first pigment component having a light reflectance value of 3 to 10%, a melt index (MFR: measured temperature 230° C., load 2.16 kg) of 20 to 80 g/10 min. Preparing a first pigment master batch chip by melting 50 to 90 parts by weight of a propylene-based polymer with a kneader;
5 to 20 parts by weight of a UV stabilizer, 5 to 30 parts by weight of a second pigment component having a light reflectance value of 11 to 20%, a second having a melt index (MFR: measured temperature 230° C., load 2.16 kg) of 20 to 80 g/10 min. Preparing a second pigment master batch chip by melting 50 to 90 parts by weight of a propylene-based polymer with a kneader;
Melt index (MFR: measured temperature 230 ℃, load 2.16kg) of 20 ~ 80g / 10 minutes of the third propylene-based polymer chip was put into the first extruder, and then the first pigment master batch chip was put into the first extruder to melt, mix, and homogenize, melt-spun through a spinneret, cool and stretch to form a filament, and then laminate on a continuously moving porous conveyor belt to form a first nonwoven layer;
A fourth propylene-based polymer chip having a melt index (MFR: measured temperature 230° C., load 2.16 kg) of 20 to 80 g/10 min was put into the second extruder, and then the second pigment master batch chip was put into the second extruder. to melt, mix, and homogenize, melt-spun through a spinneret, cool and stretch to form filaments obtaining a nonwoven fabric having a multilayer structure by forming a;
transferring the nonwoven fabric of the multilayer structure to a calender and then thermally bonding the nonwoven fabric to impart shape stability; and
A method of manufacturing a spunbond nonwoven fabric for mulching comprising the step of imparting water permeability by applying and drying a hydrophilic agent to the nonwoven fabric of the multilayer structure. 12. The method of claim 11,
The first propylene-based polymer, the second propylene-based polymer, the third propylene-based polymer and the fourth propylene-based polymer are the same or different from each other.

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