KR102445576B1 - Porous agricultural mulching laminate film capable of controlling light reflection and its manufacturing method - Google Patents

Abstract

The present invention provides a porous agricultural mulch lamination film, which exhibits excellent breathability, waterproofness, rigidity and durability, and can improve energy saving and heating efficiency with thermal insulation and heat shielding properties.

Description

A porous agricultural mulching laminated film capable of controlling light reflection and manufacturing method thereof

The present invention relates to a porous agricultural mulch lamination film, and when high-temperature damage caused by abnormal weather occurs, it also affects the growth and quality of the following year, and the effect continues from year to year to affect the final harvest, so it is stable in response to abnormal weather It relates to a porous agricultural mulching laminate film with excellent thermal barrier properties that can grow crops with

In addition, the invention relates to a porous agricultural mulching laminate film having excellent thermal barrier properties that can maximize energy saving and heating and cooling efficiency by improving thermal insulation and heat shielding properties, and can solve soil high temperature phenomenon.

Plant cultivation areas for major medicinal crops in Korea have reached saturation, and it is expected that the cultivable area for plants will continue to decrease due to global warming. It is necessary to develop a low-temperature maintenance mulching film that can solve the phenomenon.

In particular, in the case of perennial medicinal crops, when high-temperature damage caused by abnormal weather occurs, it affects the growth and quality of the following year, and the effect continues from year to year and affects until the final harvest. You need to have the skills you can.

As the conventional mulching film used for this purpose, a nonwoven mulching film, a vinyl mulching film, a light-shielding mesh mulching film, and the like were generally used.

In the case of a mulching film composed of a non-woven fabric, it has high moisture permeability and air permeability, but has a disadvantage in that it is heavy in weight and particularly weak in durability and can be damaged by external factors such as rain and wind. In the case of vinyl mulching, durability and thermal stability are good, but ventilation and moisture permeability are very low due to the nature of vinyl, so it is inconvenient to configure a separate hole, and there is a disadvantage that weeds can grow between the holes.

When the light shielding net is used as a mulching film, there is an advantage of excellent durability, but there is a point that it is not easy to work because it is too heavy and bulky.

Therefore, there is a need for a mulching film that can be used for a long period of time due to its good durability, and has excellent moisture permeability and air permeability to suppress soil high temperature.

In addition, in the case of the conventional mulching film, white and black are mainly used. In the case of white, the direct sunlight reflectance is high, which can promote cell destruction and aging of plants by ultraviolet wavelengths, and in the case of black, it absorbs all sunlight to the soil. Due to the high temperature of the plant, there may be a problem that the plant may die.

Accordingly, it has excellent durability, and excellent breathability, moisture permeability, and moisture-proofing properties to prevent soil heating, and in particular, by selecting and reflecting only wavelength bands in which crops are photosynthesized, suppresses growth degradation due to wavelengths such as UV rays of crops, and additional There is a need for research and development on a multifunctional mulching laminated film capable of suppressing heat generation.

US Patent Publication No. 4,929,303 (May 29, 1999)

The present invention has been devised to solve the above problems, and has excellent mechanical properties such as tensile strength and elongation, and has excellent durability while improving air permeability and waterproofness as well as heat blocking properties, thereby maximizing cooling and heating and energy saving efficiency. An object of the present invention is to provide a porous agricultural mulch lamination film that can be made.

In addition, the present invention lowers the reflectance of wavelengths unnecessary for photosynthesis, selectively increases the reflectivity of blue light and red light, prevents thermal shock by preventing high temperature rise, and promotes photosynthesis to improve plant growth by providing a porous agricultural mulching laminate film to provide will be.

Another object of the present invention is to provide a porous agricultural mulch laminated film that has moisture permeability/breathability to allow the inflow and outflow of water vapor and air, and prevents soil overhumidity by blocking the inflow of moisture due to rainfall.

In addition, the present invention promotes the growth of crops such as fruit trees, improves the foam quality such as coloring, reduces the use of pesticides by suppressing the occurrence of weeds, and prevents the rise of the ground temperature to provide a mulching laminated film that reduces damage from high temperatures.

The present invention is a porous agricultural mulching laminated film having a porous polyolefin base layer and a non-woven fabric layer laminated on one or both sides of the base layer and a light reflection control printing layer printed on the non-woven fabric layer, wherein the porous polyolefin base film ( a) Linear low-density polyethylene having a density of 0.910 to 0.925 g/cm ³ (b) Linear low-density polyethylene having a density of 0.930 to 0.940 g/cm ³ (c) Melt index (190°C, 2.16 kg) according to ASTM D 1238 5 to 10g/10min of low-density polyethylene, (d) C ₉ to C ₂₄ It provides a porous agricultural mulching laminated film that is prepared including calcium carbonate and (e) titanium dioxide surface-coated with saturated fatty acids.

According to an aspect of the present invention, the porous polyolefin base layer has (a) a density of 0.910 to 0.925 g/cm ³ with respect to 100 parts by weight of a linear low-density polyethylene, (b) a linear density of 0.930 to 0.940 g/cm ³ 10 to 40 parts by weight of a low density polyethylene resin, (c) 10 to 40 parts by weight of a low density polyethylene resin having a melt index (190° C., 2.16 kg) of 5 to 10 g/10 min according to ASTM D 1238, (d) C ₉ to C ₂₄ 80 to 200 parts by weight of calcium carbonate surface-coated with a fatty acid of (e) may be prepared including 3 to 10 parts by weight of titanium dioxide.

According to an aspect of the present invention, the calcium carbonate may include those having an average particle diameter of 1 to 5 μm and a maximum particle diameter of 10 μm or less.

According to an aspect of the present invention, the light reflection control printed layer may include a printed layer in which 10 to 80% of the total area is printed.

According to an aspect of the present invention, the light reflection control printing layer may include a stripe pattern.

According to an aspect of the present invention, the porous agricultural mulching paper film may reflect a wavelength of 400 to 700 nm.

According to an aspect of the present invention, the porous agricultural mulching laminated film may include a basis weight of 10 to 150 g/m 2 and a moisture permeability of 4,000 to 15,000 g/m 2 24hr.

According to an aspect of the present invention, (a) with respect to 100 parts by weight of linear low-density polyethylene having a density of 0.910 to 0.925 g/cm ³ , 10 to 40 parts by weight of a linear low-density polyethylene resin having a density of 0.930 to 0.940 g/cm ³ by weight, 10 to 40 parts by weight of a low-density polyethylene resin having a melt index (190° C., 2.16 kg) of 5 to 10 g/10 min according to ASTM D 1238, 80 to 200 parts by weight of calcium carbonate surface-coated with C ₉ to C ₂₄ fatty acids, dioxide 3 to 10 parts by weight of titanium, 0.1 to 10 parts by weight of metallic stearic acid, 0.1 to 20 parts by weight of a UV inhibitor, 0.1 to 20 parts by weight of an antioxidant, and melt extrusion to prepare a compound composition for a porous polyolefin substrate;

(b) extruding the compound composition for the porous polyolefin substrate to form a porous polyolefin sheet; and

(c) laminating a nonwoven fabric on one side or both sides of the porous polyolefin sheet and pressing to prepare a porous agricultural mulching laminated film;

According to an aspect of the present invention, after step c), a printing layer may be further included in the porous agricultural mulch laminated film.

According to an aspect of the present invention, the printed layer may be formed in a stripe pattern.

The porous agricultural mulching laminated film according to the present invention has the advantage of excellent durability due to excellent mechanical strength such as tensile strength, tear strength, and elongation.

In addition, the porous agricultural mulching laminated film according to the present invention has excellent moisture permeability, and due to the heat of vaporization absorbed when moisture is vaporized by light and heat, it can exert the effect of maintaining the temperature of the soil inside the mulching film at a low temperature. have.

In addition, the present invention lowers the reflectance of wavelengths unnecessary for photosynthesis, selectively increases the reflectivity of blue light and red light, prevents thermal shock from rising to high temperature, and promotes photosynthesis to provide a porous agricultural mulching laminate film for improving plant growth. .

In addition, the present invention promotes the growth of crops such as fruit trees, improves the foam quality such as coloring, reduces the use of pesticides by suppressing the occurrence of weeds, and prevents the temperature rise to provide a porous agricultural mulching laminated film that reduces damage at high temperatures.

1 is a graph showing the reflected wavelength according to the color of the printed layer of the porous agricultural mulch lamination film.

Hereinafter, the present invention will be described in more detail through embodiments or examples including the accompanying drawings. However, the following specific examples or examples are only a reference for describing the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

Also, unless defined otherwise, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of effectively describing particular embodiments only and is not intended to limit the invention.

Also, the singular forms used in the specification and appended claims may also be intended to include the plural forms unless the context specifically dictates otherwise.

Also, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

In the case of the conventional mulching film substrate, it has low moisture permeability and breathability, or, conversely, has disadvantages such as durability and heavy weight. There were disadvantages in that it could not harmoniously give the complex properties that inhibit it sufficiently, resulting in over-moisture soil or high-temperature damage caused by the black mulching film.

All of the above problems were solved by providing the porous agricultural mulching paper film of the present invention.

The present invention has completed the present invention by providing a porous agricultural mulching paper film having a porous polyolefin base layer and a nonwoven layer laminated on one or both sides of the base layer and a light reflection control printing layer printed on the nonwoven layer. .

In the present invention, the porous polyolefin substrate layer has (a) a density of 0.910 to 0.925 g/cm ³ Based on 100 parts by weight of the linear low-density polyethylene and 100 parts by weight of the linear low-density polyolefin, (b) 10 to 40 parts by weight of a linear low-density polyethylene resin having a density of 0.930 to 0.940 g/cm ³ , (c) Melt index according to ASTM D 1238 (190° C., 2.16 kg) of 5 to 10 g/10 min 10 to 40 parts by weight of a low-density polyethylene resin, (d) 80 to 200 parts by weight of calcium carbonate surface-coated with a C ₉ to C ₂₄ fatty acid, and (e) titanium dioxide It is prepared including 3 to 10 parts by weight.

In the present invention, as the porous substrate layer, the linear low-density polyethylene is used as a main component, and calcium carbonate surface-treated with a linear low-density polyethylene resin having a low density and another density and a fatty acid is adopted, so that the calcium carbonate is dispersed and particles The interface between the resin and the resin is well controlled, and due to the formation of micropores, water penetration can be controlled, so that excessive moisture in the soil is prevented even during rain, and oxygen and air permeate well to promote plant growth. .

In addition, in the present invention, by mixing titanium dioxide with calcium carbonate, it has the effect of exhibiting excellent UV protection properties.

In addition, in the present invention, when a porous polyethylene substrate made of mixed inorganic particles of the resin composition and fatty acid surface-treated calcium carbonate and titanium dioxide is used in the present invention, 400 to 700 nm light, which is a wavelength affecting photosynthesis, is transmitted and 400 nm or less It promotes photosynthesis by blocking UV rays and infrared rays that generate abnormal heat by blocking blue light of 700 nm or more.

For example, the color of fruits such as apples is determined by pigments such as anthocyanins, and since the pigment is a glycoside and the raw material is glucose, photosynthesis must be good. Environmental conditions such as these are very important and can provide a new porous agricultural mulching laminated film that achieves this.

In the porous agricultural mulching laminated film according to an embodiment of the present invention, as a resin component constituting the porous substrate, a) a density of 0.910 to 0.925 linear low-density polyethylene, (b) density with respect to 100 parts by weight of the linear low-density polyethylene resin A mixture of 10 to 40 parts by weight of a linear low-density polyethylene resin of 0.930 to 0.940, (c) 10 to 40 parts by weight of a low-density polyethylene resin having a melt index (190° C., 2.16 kg) of 5 to 10 g/10 min according to ASTM D 1238 A resin is used, and as inorganic particles imparting porosity to the resin, (d) 80 to 200 parts by weight of calcium carbonate surface-coated with C ₉ to C ₂₄ fatty acids and (e) 3 to 10 parts by weight of titanium dioxide are mixed. By using it, it prevents excessive moisture from penetrating into the inside during the rainy season to avoid an over-humidity state, and at high temperature, the moisture inside is vaporized and released to the outside of the porous substrate.

When the moisture is vaporized, the temperature inside the soil is lowered due to the heat of vaporization absorbed when the water is vaporized, so that the plant can grow well. In addition, since the porous agricultural mulching laminated film contains fatty acid surface-treated calcium carbonate and titanium dioxide, it has a function of blocking ultraviolet rays and gives a function of blocking harmful ultraviolet rays.

In particular, as the porous agricultural mulching laminated film for calcium carbonate and titanium dioxide contains calcium carbonate and titanium dioxide, the color of the porous agricultural mulching laminated film is further whitened, and the reflective effect of direct sunlight, etc. is excellent, Accordingly, it may have the effect of maintaining the surface temperature and soil temperature of the porous agricultural mulching laminated film at a low temperature.

Of course, the porous agricultural mulch laminated film may further include a sunscreen agent.

In the present invention, when the resin component constituting the substrate includes high-density polyethylene or polypropylene, porosity appears excessively, and in particular, in the case of polypropylene, it is difficult to process due to crystallinity.

When the porosity is excessively generated, excessive moisture penetrates inside during the rainy season and becomes over-humidified, which inhibits plant growth, which is also not good, and it is not easy to maintain a certain amount of moisture in the soil.

When the calcium carbonate surface-treated with the fatty acid is used in the present invention, it is combined with the linear low-density and low-density polyethylene mixed resin component constituting the substrate to maintain a constant moisture level, and the dispersion of calcium carbonate becomes uniform, resulting in localized large pores. It is good to prevent the penetration of excessive water due to the occurrence of

That is, in the present invention, an appropriate interface is formed at the interface of inorganic particles by mixing a mixed resin with low-density polyethylene as a main component, calcium carbonate surface-treated with fatty acid, and a certain amount of titanium dioxide. It is shown to impart complex properties such as moisture permeability, breathability, moisture-proof property, light reflection properties, infrared reflection reduction and suppression of earth temperature increase to the porous agricultural mulching laminate film.

As long as the calcium carbonate according to an embodiment of the present invention is surface-treated with a fatty acid, the calcium carbonate is talc, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, calcium chloride, calcium sulfate, aluminum hydroxide, zinc oxide, magnesium hydroxide, oxide Titanium, alumina, mica, asbestos powder, zeolite, may be replaced with any one or more inorganic particles selected from silicate clay, or may be further included.

In addition, the average particle size of the calcium carbonate according to an embodiment of the present invention may be 1 to 5 μm, preferably 2 to 4 μm, more preferably 2 to 3 μm, but must be limited thereto it's not going to be

In addition, the maximum particle size of the calcium carbonate according to an embodiment of the present invention may be 15 μm, preferably 12 μm, more preferably 10 μm, but is not necessarily limited thereto.

As the calcium carbonate satisfies both the average particle size and the maximum particle size, the uniformity of the pores of the porous agricultural mulching laminated film is excellent, moisture can be uniformly dissipated to the outside, and the temperature of the soil due to the heat of vaporization is further reduced. may have an effect.

In addition, it is possible to effectively prevent water absorption into the porous agricultural mulching laminated film during heavy rain, thereby suppressing necrosis of the roots of crops due to excessive moisture.

The porous agricultural mulching laminated film according to an embodiment of the present invention may have a basis weight of 10 to 150 g/m2, a moisture permeability of 4,000 to 15,000 g/m224hr, and preferably a basis weight of 15 to 120 g/m2, The moisture permeability may be 5,000 to 11,000 g/m 24 hr, and more preferably, the basis weight is 20 to 90 g/m, and the moisture permeability may be 6,000 to 10,000 g/m 24 hr, but is not necessarily limited thereto.

By satisfying the basis weight and moisture permeability, the water vapor of the soil can be smoothly discharged to the outside, and the temperature inside the soil can be lowered. Inhibition of plant growth due to this can be prevented.

The resin composition used to prepare the porous polyolefin substrate may further include 0.1 to 20 parts by weight of an antioxidant and 0.1 to 20 parts by weight of a UV stabilizer based on 100 parts by weight of the base resin, in addition to commonly used lubricants, flame retardants, Any additive such as an antibacterial agent may be used without limitation.

The porous polyolefin substrate is not particularly limited, but the puncture strength may be 400 gf or more, specifically 450 gf or more, and more specifically 500 gf or more. The upper limit is not limited, but may be, for example, 1,000 gf. In the case of having a puncture strength within the above range, the thin film formation of the porous substrate may be facilitated, and the mechanical strength of the composite porous separator may be improved, which may be more preferable.

In addition, the thickness of the porous polyolefin substrate is not limited, but may be 1 to 100 μm, specifically 5 to 50 μm, and more specifically 6 to 30 μm. The thickness of the breathable substrate is limited However, it may be 1 to 100 μm, specifically 5 to 50 μm, and more specifically 6 to 30 μm.

In the porous agricultural mulching laminated film according to an embodiment of the present invention, the nonwoven fabric laminated on both sides may be a nonwoven fabric containing a polyolefin or polyester-based resin.

In the present invention, the nonwoven fabric is laminated with a porous polyolefin substrate, and may be adhered by thermocompression bonding between the porous polyolefin substrate and the corrosion cloth or may be adhered using an adhesive, and not only can achieve the effect of improving strength, During thermal bonding, adhesion was possible even when heated to a low temperature, so that it was possible to achieve an improvement in adhesion while maintaining air permeability.

At this time, it is preferable that the temperature during the heat sealing is in the range of 80 to 150° C. to prevent the porous polyolefin substrate from being completely melted, so that the air permeability is maintained even after bonding.

The nonwoven fabric of the present invention may be a spunbond nonwoven fabric, and the spunbond nonwoven fabric may include a polyester-based resin. Or, in one embodiment, a core (core) made of a polyester-based resin and a polyethylene-based resin may be manufactured as a filament having a sheath (sheath) structure. At the same time, strength can be achieved by the resin, and adhesion to the olefin-based resin used in the porous polyolefin substrate can be improved by the polyethylene-based resin surface-coated in a sheath structure, and thus, it can be heated at low temperature during thermal bonding. As adhesion is possible even when heated, it is possible to achieve improvement in adhesion while maintaining air permeability.

The spunbond nonwoven fabric preferably has a filament made of polyethylene terephthalate (PET) resin as a core, and a polyethylene resin having a melting point of 100 to 150° C. on the surface of the core is coated in a sheath structure. By using it, it is possible to achieve not only strength but also adhesion and breathability.

The spunbond nonwoven fabric has a thickness of 0.1 to 0.5 mm, a tensile strength in the MD direction of 10 to 25 kg/5 cm, a tensile strength in the CD direction of 5 to 15 kg/5 cm, and an elongation in the MD direction of 40 To 80%, elongation in CD direction of 40 to 80%, and tear strength of 0.1 to 1.5 kg is suitable to achieve the final physical properties, an example of such a spunbond nonwoven fabric is Japan Unitica (UNITIKA) has ELEVES.

By laminating the nonwoven fabric and the porous polyolefin substrate by the method as described above, the present invention produces a porous agricultural mulching laminated film having breathability through which moisture or water droplets are impermeable but moisture passes without a separate process for imparting air permeability after lamination. can do.

Next, in the present invention, a light reflection control printing layer may be formed on the nonwoven fabric layer. The light reflection control printing layer may be printed in various colors.

In the case of the conventional mulching film, black and white are mainly used, and in the case of black, there is an advantage of suppressing the growth of weeds, etc. around by absorbing light. There are problems that hinder growth.

In the case of white, the temperature of the inner soil can be maintained lower than that of black by reflecting light, but problems such as discoloration of leaves or destruction of plant cells may occur due to excessive irradiation of reflected ultraviolet and reflected visible light.

However, when forming a printing layer that controls light reflection characteristics in black, yellow and red colors in stripe form, sea-island form, various pattern forms, etc. on the porous agricultural mulching laminate film, it is essential for photosynthesis of plants. It helps the growth of plants by selectively reflecting the necessary 400 to 700 nm, preferably 400 to 500 nm or 600 to 700 nm wavelength, and absorbs ultraviolet or infrared and unnecessary wavelengths of photosynthesis to block the heat irradiated to the plant. may have an effect.

Therefore, another feature of the present invention is to print a light reflection control printing layer having a variety of colors and patterns on the outermost side of the agricultural mulching laminated film of the present invention.

When 50% of the surface of the light reflection control printing layer of the present invention is printed in a stripe form in red color, photosynthetic reflected light of a wavelength of 600 to 700 nm increases, and when printed in a stripe form in yellow, a wavelength of 500 to 600 nm By increasing the reflected light of photosynthesis, it selectively reflects blue light and red light necessary for photosynthesis, and absorbs light unnecessary for photosynthesis, preventing the increase in temperature in the plant due to the inflow of excess energy to the plant and the probability of damage to soil high temperature can be increased compared to red. .

According to an aspect of the present invention, (a) with respect to 100 parts by weight of a linear low-density polyethylene having a density of 0.910 to 0.925, 10 to 40 parts by weight of a linear low-density polyethylene resin having a density of 0.930 to 0.940, a melt index of 5 to 10 g/10min. 10 to 40 parts by weight of low-density polyethylene resin, 80 to 200 parts by weight of calcium carbonate surface-coated with C ₉ to C ₂₄ fatty acids, 3 to 10 parts by weight of titanium dioxide, 0.1 to 10 parts by weight of metal stearic acid, 1 to 20 parts by weight of UV inhibitor parts, mixing 0.1 to 20 parts by weight of an antioxidant and melt-extruding to prepare a compound composition for a porous polyolefin substrate; (b) extruding the compound composition for the porous polyolefin substrate to form a porous polyolefin sheet; And (c) laminating a nonwoven fabric on one side or both sides on the porous polyolefin sheet and pressing to prepare a porous agricultural mulching laminated film; may provide a method for producing a porous agricultural mulching laminated film comprising.

In step a), after mixing all of the above compositions, injecting them into a twin screw extruder and melt-extruding them to obtain a compound composition for a porous polyolefin substrate in a pellet state, the melting temperature may be 200 to 300 ° C., preferably Preferably it may be 210 to 270 ℃, more preferably 220 to 250 ℃, if the melting temperature is not limited thereto.

Since the composition and content of the composition have been described above, it is not described therein.

In step b), as a step of obtaining an original sheet by putting the pellets prepared in step a) into an extruder, the melting temperature may be 200 to 300 ° C. However, the method of manufacturing the original sheet is not limited.

The prepared original sheet may be prepared through a stretching process to prepare a porous polyolefin substrate. The stretching may be performed at a stretching temperature of 50 to 100° C., and the stretching ratio may be 2 to 4 times, but is not limited thereto.

In step c), a porous agricultural mulching laminated film can be completed by applying a hot melt adhesive to the prepared porous polyolefin substrate, and then laminating a nonwoven fabric. The hot melt bonding conditions may be performed at 80 to 100° C., but is not limited thereto.

Since the above-described nonwoven fabric has already been described in the present invention, it is omitted here.

According to an aspect of the present invention, after step c), a printing layer may be further included in the porous agricultural mulch laminated film.

The printed layer may be 10 to 80% of the area on the outermost surface of the porous mulching film, preferably 20 to 70%, and more preferably 30 to 60%, but is not limited thereto.

Since the printed layer satisfies the above area, it is possible to evenly reflect the wavelength of 400 to 700 nm that helps the growth of plants, and has the advantage of being able to absorb a wide range of wavelength bands that interfere with plant growth, such as ultraviolet rays and infrared rays.

The printed layer pattern may also be in a stripe form, a sea-island form, various pattern forms, and the like, preferably in a stripe form, but is not limited thereto.

Since the color of the printed layer has already been described in the present invention, it is omitted here.

Hereinafter, the present invention will be described in more detail based on Examples and Comparative Examples. However, the following Examples and Comparative Examples are only examples for explaining the present invention in more detail, and the present invention is not limited by the following Examples and Comparative Examples.

[Example 1]

100 parts by weight of the first linear low-density polyethylene resin (SKI, FT850, density 0.919 g/cm ³ ), 25 parts by weight of the second linear low-density polyethylene resin (SKI FT811, density 0.932 g/cm ³ ) 25 parts by weight, low-density polyethylene (SCG LD777) 25 135 parts by weight of calcium carbonate, 6 parts by weight of titanium dioxide (CR-834), 1 part by weight of calcium stearate, 3 parts by weight of sunscreen UV119, UV62, 0.7 parts by weight of antioxidants (Anox20, Alkanox240) were mixed, put in a Hensel mixer, mixed, and then injected into a twin screw extruder having a screw diameter of 130 mm, and melt-extruded at 230° C. to obtain a compound composition for a porous polyolefin substrate in a pellet state. The obtained compound composition was put into a hopper, and a disc sheet was molded using a T-die molding machine having a screw diameter of 130 mm. The molded original sheet was uniaxially stretched three times at a stretching temperature of 70° C. to prepare a porous polyolefin substrate having a basis weight of 35 g/m 2 .

After laminating on both sides a PP nonwoven fabric (Toray Advanced Materials, basis weight: 30 g/m2) coated with 5 g/m of hot melt (Ire AT, IH-730H) on the prepared porous polyolefin substrate (30 g/m2) on both sides, 90 A porous agricultural mulching laminated film was prepared by passing a roller preheated to ℃.

After red printing layer alcohol ink gravure printing was performed in a stripe form with an area of 50% on the outermost surface of the porous agricultural mulching film thus prepared, the physical properties of the prepared film are shown in Table 1 and FIG. 1 below.

[Example 2]

In Example 1, the same procedure was performed except that 100% of the outermost surface was printed with a black printed layer instead of a red printed layer. The physical properties of the prepared film are shown in Table 1 and FIG. 1 below.

[Example 3]

In Example 1, the same procedure was performed except that the outermost surface was printed with a low-row printing layer instead of a red printing layer.

The physical properties of the prepared film are shown in Table 1 and FIG. 1 below.

[Example 4]

In Example 1, the same procedure was performed except that the maximum particle diameter of the calcium carbonate was 20 μm or less and the average particle diameter was 2.2 μm.

The physical properties of the prepared film are shown in Table 1 and FIG. 1 below.

[Comparative Example 1]

In Example 1, the same procedure was performed except that 50 parts by weight of linear low-density polyethylene FT811 was used without using low-density polyethylene. The physical properties of the prepared film are shown in Table 1 and FIG. 1 below.

[Comparative Example 2]

The same procedure was performed except that in Example 1, calcium carbonate of the same average particle diameter was used without surface treatment of stearic acid. The physical properties of the prepared film are shown in Table 1 and FIG. 1 below.

[Comparative Example 3]

Example 1 was carried out in the same manner except that titanium dioxide was not used. The physical properties of the prepared film are shown in Table 1 and FIG. 1 below.

[Method for evaluating physical properties]

1. Waterproof pressure: Measured by JIS L1092 method.

2. Moisture permeability: It was measured by the JIS Z0208 method.

3. Measurement of reflectance from 400 to 700 nm: KS L 2514

4. Evaluation of over-wetting: When 1 kg of soil was wrapped with a mulching film and placed in water for 5 hours, over-wetting was measured through Equation 1 below.

[Equation 1]

(When the value of over-humidity in Equation 1 above is 60: stagnant

When the value of over-moisture in Equation 1 is less than 60 and 50 or more: Wet

When the value of over-moisture in Formula 1 is less than 50 and greater than 40: Moist

When the value of over-moisture in Formula 1 is greater than or equal to 30 and less than 40: Less moist

When the value of over-humidity in Formula 1 is less than 30: dry)

waterproof pressure
(kpa) Basis weight (g/㎡) moisture permeability
(g/㎡*24hrs) 400-700nm reflectance Excessive moisture Example 1 39 82 9,120 70-75% moist Example 2 39 82 9,130 60-65% moist Example 3 39 83 9,090 70-75% moist Example 4 40 84 9,000 70-75% wet Comparative Example 1 27 90 4,000 70-75% dry Comparative Example 2 32 81 13,500 70-75% high Comparative Example 3 34 79 5,400 70-75% less moist

As shown in the table above, the film of the present invention has adequate waterproofing pressure, and also satisfies moisture permeability of 6000 g/m 2 * 24hrs or more, so that water vapor including heat of vaporization is smoothly discharged to the outside while suppressing soil temperature to grow plants even in summer can provide a good environment for

In addition, when immersed in water, water permeates due to its excellent waterproofness and does not cause overhumidity, thereby preventing excessive moisture due to the rainy season from being absorbed into the inner ridge.

In addition, it can be seen that the light reflectance at 400 to 700 nm is well controlled by the light reflective printing layer.

In addition, as shown in FIG. 1, in the case of having the red printed layer of Example 1, when 50% of the surface of the light reflective printed layer of the present invention is printed in a red color in a stripe form, the photosynthetic effective light reflectance of 600 to 700 nm wavelength is By increasing, the photosynthetic effective light of the plant is reflected to help the growth of the plant, and at the same time, it absorbs all the UV rays that affect the cell destruction of plants and the wavelengths that do not affect photosynthesis, so that it is not reflected back to the plant. It has the advantage of further increasing the growth of plants.

As described above, the present invention has been described with specific matters and limited examples and drawings, but these are only provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments, and the present invention is not limited to the above embodiments. Various modifications and variations are possible from these descriptions by those of ordinary skill in the art.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and not only the claims to be described later, but also all those with equivalent or equivalent modifications to the claims will be said to belong to the scope of the spirit of the present invention. .

Claims (10)

A porous agricultural mulching laminated film having a porous polyolefin base layer and a nonwoven layer laminated on one or both sides of the base layer, and a light reflection control printing layer printed on the nonwoven layer,
The porous polyolefin base layer is (a) with respect to 100 parts by weight of a linear low-density polyethylene having a density of 0.910 to 0.925 g/cm3, (b) 10 to 40 parts by weight of a linear low-density polyethylene resin having a density of 0.930 to 0.940 g/cm3 by weight, ( c) 10 to 40 parts by weight of a low-density polyethylene resin having a melt index (190° C., 2.16 kg) of 5 to 10 g/10 min according to ASTM D 1238, (d) 80 to 200 parts by weight of calcium carbonate surface-coated with C9 to C24 fatty acids Part and (e) a porous agricultural mulching laminated film prepared including 3 to 10 parts by weight of titanium dioxide. delete The method of claim 1 .
The calcium carbonate is a porous agricultural mulching laminated film having an average particle diameter of 1 to 5 μm and a maximum particle diameter of 10 μm or less. According to claim 1,
The light reflection control printing layer is a porous agricultural mulching laminated film comprising a printing layer printed 10 to 80% with respect to the total area. 5. The method of claim 4,
The light reflection control printing layer is a porous agricultural mulching laminated film comprising a stripe pattern. 6. The method of claim 5,
The porous agricultural mulching laminated film is a porous agricultural mulching laminated film that reflects a wavelength of 400 to 700 nm. According to claim 1,
The porous agricultural mulching laminated film has a basis weight of 10 to 150 g/m2, and a moisture permeability of 4,000 to 15,000 g/m224hr. (a) with respect to 100 parts by weight of linear low-density polyethylene having a density of 0.910 to 0.925 g/cm ³ , 10 to 40 parts by weight of a linear low-density polyethylene resin having a density of 0.930 to 0.940 g/cm ³ , melt index according to ASTM D 1238 ( 190 ° C., 2.16 kg) of 5 to 10 g/10 min 10 to 40 parts by weight of a low-density polyethylene resin, 80 to 200 parts by weight of calcium carbonate surface-coated with C ₉ to C ₂₄ fatty acids, 3 to 10 parts by weight of titanium dioxide, metal Preparing a compound composition for a porous polyolefin substrate by mixing 0.1 to 10 parts by weight of stearic acid, 0.1 to 20 parts by weight of a UV inhibitor, and 0.1 to 20 parts by weight of an antioxidant;
(b) extruding the compound composition for the porous polyolefin substrate to form a porous polyolefin sheet; and
(c) laminating a nonwoven fabric on one side or both sides on the porous polyolefin sheet and pressing to prepare a porous agricultural mulching laminated film; Method for producing a porous agricultural mulching laminated film comprising a. 9. The method of claim 8,
After the step c), the method for producing a porous agricultural mulching laminated film further comprising a printing layer on the porous agricultural mulching laminated film. 10. The method of claim 9,
The printing layer is a method for producing a porous agricultural mulching laminated film that is formed in a stripe pattern.

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