KR101468141B1 - Light-diffusion film composition, and agricultural light-diffusion film prepared from the same - Google Patents

Abstract

More particularly, the present invention relates to a light diffusion film composition comprising a polyolefin resin, an organic acrylic particle and an inorganic silicon particle, and a method for producing a light diffusion film composition for agricultural light Diffusion film.
The light diffusion film for agricultural use produced by using the composition of the present invention is excellent in light transmittance and minimizes the amount of light that is lost due to reflection, thereby providing a sufficient level of light for growth of the crop inside the agricultural facility house and maximizing the thermal effect . In addition, since the light transmitted through the bar having excellent light diffusing property is scattered evenly in various directions, it is possible to uniformly provide the light of brightness required for growing the crop for each position in the house, thereby improving the yield, sugar content and color characteristics of the crop .

Description

TECHNICAL FIELD [0001] The present invention relates to a light diffusion film composition and an agricultural light diffusion film produced therefrom. BACKGROUND OF THE INVENTION 1. Field of the Invention [0002]

More particularly, the present invention relates to a light diffusion film composition comprising a polyolefin resin, an organic acrylic particle and an inorganic silicon particle, and a method for producing a light diffusion film composition for agricultural light Diffusion film.

Agricultural film is one of the representative agricultural materials and is used to cover facilities such as vinyl houses. As a conventional agricultural film, a polyolefin resin film such as a polyvinyl chloride film, polyethylene or ethylene-vinyl acetate copolymer is mainly used. Among them, a polyolefin resin film which is light in weight and does not generate toxic gas at the time of incineration is installed It is widely used for gardening.

On the other hand, the agricultural film has a light transmittance (light transmittance, a value obtained by dividing the intensity of transmitted light by the intensity of incident light), which is a characteristic of transmitting light well, in order to exhibit excellent crop breeding, Scattering, and diffusing properties, which are scattering and diffusing properties, are required.

Specifically, the farm house shows the difference in growth or yield depending on the direction of the structure according to the direction of the structure. When the direct sunlight is used only, the crop of the south side has high light transmittance and the crop is good. On the contrary, .

In addition, the diffusibility of transmitted light in an agricultural house film affects the improvement of color, sugar content and yield depending on kinds of fruits, flowers and vegetables, or prevention of occurrence of disease. That is, if there is a large amount of direct light among the light passing through the film, leaf blast due to direct sunlight or a sudden rise in the temperature of the house causes seedling blossom. At the same time, since the scattered light is decreased, many shade portions are formed by aggregates such as crops and house pillars, the growth of the crops is poor in the shade portions, the color of the crops is varied, There is a difficulty in management of cultivation and harvesting time, such as a difference in growth rate between crops.

Therefore, it is possible to ensure excellent light transmittance by minimizing light reflected and lost by the agricultural film, and to maintain the illuminance per position in the house constantly, thereby providing an excellent light Diffusion-resistant films are under study.

As such conventional techniques, Japanese Unexamined Patent Publication (Kokai) No. 10-292056 discloses a fluororesin film having excellent light diffusibility by dispersing composite particles composed of silica, talc, mica, and the like in a fluororesin. However, in this case, in order to increase the scattered light, the amount of the added fine particles is excessively increased, resulting in a problem that the light transmittance of the film is lowered. Japanese Unexamined Patent Application, First Publication No. Hei 8-51871 discloses a method of scattering light by forming a roughened surface on at least one side of a film. However, in this case, there is a problem that the strength of the bar base film on which the concavo-convex roughened surface is formed on the base film itself is deteriorated.

Japanese Patent Application Laid-Open No. 10-292056 Japanese Patent Application Laid-Open No. 8-51871

SUMMARY OF THE INVENTION The present invention has been made to overcome the problems of the prior art as described above, and it is an object of the present invention to provide a polyolefin resin which is excellent in both light transmittance and light diffusibility by specifying polyolefin resin as a matrix, A light diffusion film composition, and an agricultural light diffusion film using the same.

In order to accomplish the above object, the present invention provides a light diffusion film composition comprising a polyolefin resin, organic acrylic particles and inorganic silicon particles.

Specifically, the present invention provides a light diffusion film composition comprising 97 to 99.7% by weight of a polyolefin resin, 0.1 to 1.0% by weight of organic acrylic particles, and 0.2 to 2.0% by weight of inorganic silicone particles.

According to another aspect of the present invention, there is provided an agricultural light diffusion film produced from the composition, and a method for producing the same.

According to the present invention, it is possible to provide a light diffusion film composition excellent in light transmittance and light diffusibility by controlling the content and size of organic and inorganic particles.

Specifically, the light diffusion film for agricultural use produced by using the above composition is excellent in light transmittance and minimizes the amount of light that is lost due to reflection. Therefore, it is possible to provide a sufficient level of light for growth of crops inside the agricultural facility house, Can be maximized. In addition, since the light transmitted through the bar having excellent light diffusing property is scattered evenly in various directions, it is possible to uniformly provide the light of brightness required for growing the crop for each position in the house, thereby improving the yield, sugar content and color characteristics of the crop .

Furthermore, the agricultural light diffusion film of the present invention is a hydrophilic film and has excellent ultraviolet (UV) blocking effect, and can improve the durability and lifetime characteristics of the film.

1 is a graph showing a light diffusion effect according to the content of the light diffusion film composition.
2 is a graph showing the light diffusion effect according to the average particle size of the organic and inorganic particles included in the light diffusion film composition.

Hereinafter, the present invention will be described in detail.

The present invention relates to a light-diffusing film composition comprising a polyolefin resin, organic acrylic particles and inorganic silicon particles, more specifically 97 to 99.7% by weight of a polyolefin resin, 0.1 to 1.0% by weight of organic acrylic particles and 0.2 to 2.0% ≪ / RTI >

As the polyolefin resin, it is possible to use one or more mixed resins selected from polyethylene (for example, low density polyethylene and high density polyethylene), ethylene copolymer and polypropylene. Preferably, a polyethylene resin is used.

The density of the low-density polyethylene is not particularly limited, and for example, polyethylene having a density of 910 to 930 kg / m 3 may be used. The density of the high-density polyethylene is not particularly limited. For example, polyethylene having a density of 941 to 970 kg / m3 may be used. The ethylene copolymer is a copolymer of ethylene and a different monomer containing ethylene as a main component and specifically includes a copolymer of ethylene and an? -Olefin having 3 to 20 carbon atoms (an olefin having a double bond at the end), ethylene-vinyl acetate Copolymer and ethylene-methyl methacrylate copolymer and the like can be used. Examples of the? -Olefin having 3 to 20 carbon atoms include propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene and 1-decene.

The content of the polyolefin resin is preferably 97 to 99.7% by weight based on the total weight of the composition. If the content is out of this range, the light diffusion effect may be somewhat lowered. More preferably, the polyolefin resin may be contained in an amount of 97.9 to 98.8% by weight based on the total weight of the composition, and the optimum light diffusion effect is exhibited.

The organic acrylic particles may be selected from among poly (meth) acrylate, polymethyl acrylate, polyethyl acrylate, polymethyl methacrylate, polyethyl methacrylate, polymethyl ethacrylate and polyethyl ethacrylate One or two or more may be mixed and used.

The organic-based acrylic particles may have a spherical structure, and the size of the particles is preferably 1 to 2 탆. If the size of the particles is smaller than 1 mu m, the light diffusion effect may be lowered due to the glare caused by the direct light. If the size exceeds 2 mu m, the light transmittance may be lowered due to excessive haze phenomenon.

As the inorganic silicon particles, one or two or more selected from silicon and silica may be used in combination.

The inorganic silicon particles may have a spherical structure, in which case the size of the particles is preferably 3 to 5 mu m. If the particle size is less than 3 mu m, the light diffusion effect may be lowered due to the glare due to the direct light. If the particle size exceeds 5 mu m, the light transmittance may be lowered due to excessive haze phenomenon.

The content of the organic acrylic particles and the inorganic silicon particles is preferably 0.1 to 1.0% by weight and 0.2 to 2.0% by weight, respectively, based on the total weight of the composition. When the content of the organic acrylic particles and the inorganic silicon particles is in the above range, the light diffusing effect and the light transmitting effect can be realized more harmoniously.

In one preferred embodiment, the organic-based acrylic particles and the inorganic silicon particles may be contained in a ratio of 1: 2, and when they are included in the ratio, they exhibit an optimum light diffusion effect.

On the other hand, when the total amount of the organic acrylic particles and the inorganic silicon particles was 1.2 to 2.1 wt% based on the weight of the entire composition, the optimum effect (light diffusivity of 78% or more) was shown (see FIG.

The average particle size of the organic-based acrylic particles and the inorganic silicon particles is preferably 2.3 to 3.2 탆 (see Fig. 2). If the average particle size is less than 2.3 mu m, the haze phenomenon may occur too much and the light diffusibility may deteriorate. If the average particle size is more than 3.2 mu m, the light transmittance may be decreased and the brightness of light necessary for smooth growth of the crop may not be provided. Particularly preferably, the overall light diffusion efficiency (light transmission and scattering) is optimum when the average particle size is 2.8 μm.

According to another aspect of the present invention, there is provided an agricultural light diffusion film produced using the light diffusion film composition described above. INDUSTRIAL APPLICABILITY The agricultural light diffusion film of the present invention can be suitably used in facility houses for the warm season greenhouse cultivation of barley crops having excellent light transmittance and light diffusibility.

According to another aspect of the present invention, there is provided a method for producing a light diffusion film composition, comprising: dispersing organic-based acrylic particles and inorganic silicon particles in a polyolefin resin through a chamber-type melt compaction process to prepare a light diffusion film composition; And extruding the mixture into a film to form a film. The production method of the present invention greatly improves the productivity of the bar film which is simply performed without a laminated structure.

Hereinafter, the present invention will be described in more detail by way of examples.

Example  One

0.1% by weight of poly (meth) acrylate having a particle diameter of 1 to 2 占 퐉 as organic-based acrylic particles and 0.2% by weight of silicon (Si) having an average particle diameter of 3 to 5 占 퐉 as the polyolefin resin, And the film composition was prepared through the melt compounding process of the chamber type.

The composition was co-extruded and blow-molded to produce an agricultural light diffusion film.

Example  2 to 10

A light diffusing film for agriculture was prepared in the same manner as in Example 1, except that the contents of polyolefin resin, organic acrylic particle and inorganic silicon particle were added as shown in Table 1 below.

Comparative Example  1 to 5

A light diffusing film for agriculture was prepared in the same manner as in Example 1, except that the contents of polyolefin resin, organic acrylic particle and inorganic silicon particle were added as shown in Table 1 below.

evaluation: Light diffusion  effect

The light diffusion effect (%) of the agricultural light diffusion films of Examples 1 to 10 and Comparative Examples 1 to 5 was measured, and the results are shown in Table 1 below.

Photodiffusion Effect according to Composition Content division Polyolefin resin
(weight%) Organic acrylic particles
(weight%) Inorganic silicon particles
(weight%) Light diffusion effect
(%) Example 1 99.70 0.10 0.20 77.42 Example 2 99.40 0.20 0.40 77.60 Example 3 99.10 0.30 0.60 77.28 Example 4 98.80 0.40 0.80 78.16 Example 5 98.50 0.50 1.00 78.03 Example 6 98.20 0.60 1.20 78.04 Example 7 97.90 0.70 1.40 78.10 Example 8 97.60 0.80 1.60 76.82 Example 9 97.30 0.90 1.80 75.44 Example 10 97.00 1.00 2.00 75.46 Comparative Example 1 96.70 1.10 2.20 74.00 Comparative Example 2 96.40 1.20 2.40 71.89 Comparative Example 3 96.10 1.30 2.60 67.68 Comparative Example 4 95.80 1.40 2.80 60.52 Comparative Example 5 95.50 1.50 3.00 52.17

1 and 1, the light diffusion film for agricultural use produced from the composition of the present invention is excellent in light diffusion effect, and in particular, in which the total amount of organic acrylic particles and inorganic silicon particles is 1.2 to 2.1 wt% It was confirmed that Examples 4 to 7 exhibited an excellent light diffusion effect of more than 78%.

Example  11 to 21

An agricultural light diffusing film was produced by the same components, contents and methods as in Example 4, except that the average particle sizes of all of the organic acrylic particles and inorganic silicon particles were as shown in Table 2 below.

evaluation

(1) Illuminance transmittance

The light transmittance (%) of the agricultural light diffusion films of Examples 11 to 21 was measured, and the results are shown in Table 2 below.

(2) Haze (HAZE)

The haze (%) was measured for the agricultural light diffusion films of Examples 11 to 21, and the results are shown in Table 2 below.

Light diffusion effect according to average particle size division Average particle size (탆) Illuminance transmittance (%) HAZE (%) Example 11 2.0 77.46 17.74 Example 12 2.2 78.29 19.26 Example 13 2.3 78.06 20.48 Example 14 2.5 78.30 21.42 Example 15 2.6 78.24 22.29 Example 16 2.8 78.20 24.37 Example 17 2.9 75.23 24.19 Example 18 3.1 71.54 24.03 Example 19 3.2 68.27 24.28 Example 20 3.4 64.23 23.76 Example 21 3.5 60.08 24.15

2 and FIG. 2, the light diffusion film for agricultural use produced from the composition of the present invention can secure an illuminance transmittance and a haze ratio higher than a certain level, and in particular, has an average particle size of 2.3 to 3.2 μm (most preferably, , 2.8 占 퐉), it was confirmed that excellent luminous transmittance and haze ratio could be realized in a harmonious manner.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. The scope of the present invention should be interpreted based on the scope of the following claims and all technical ideas within the scope of equivalents thereof are to be construed as being included in the scope of the present invention. It is to be understood that the invention is not limited thereto.

Claims (14)

A polyolefin resin, an organic acrylic particle and an inorganic silicone particle,
Wherein the organic acrylic particles and the inorganic silicon particles are contained in a ratio of 1: 2,
The total amount of the organic acrylic particles and the inorganic silicon particles is 1.2 to 2.1 wt% based on the total weight of the composition,
Wherein the average particle size of the organic acrylic particles and the inorganic silicon particles as a whole is 2.3 to 3.2 占 퐉.
The method according to claim 1,
97 to 99.7% by weight of the polyolefin resin, 0.1 to 1.0% by weight of the organic acrylic particles, and 0.2 to 2.0% by weight of the inorganic silicon particles.
The method according to claim 1,
Wherein the polyolefin resin is one or two or more mixed resins selected from polyethylene, ethylene copolymer and polypropylene.
The method according to claim 1,
Wherein the organic acrylic particles are selected from the group consisting of poly (meth) acrylate, polymethylacrylate, polyethylacrylate, polymethylmethacrylate, polyethylmethacrylate, polymethylethacrylate and polyethylethacrylate Or a mixture of two or more thereof.
The method according to claim 1,
Wherein the organic-based acrylic particles have a spherical structure.
6. The method of claim 5,
Wherein the size of the organic-based acrylic particles is 1 to 2 占 퐉.
The method according to claim 1,
Wherein the inorganic silicon particles are at least one selected from the group consisting of silicon and silica.
The method according to claim 1,
Wherein the inorganic silicon particles have a spherical structure.
9. The method of claim 8,
Wherein the inorganic silicon particles have a size of 3 to 5 占 퐉.
delete delete delete An agricultural light diffusion film produced from the light diffusion film composition of any one of claims 1 to 9.
To the polyolefin resin,
Organic-based acrylic particles and inorganic silicon particles contained in a ratio of 1: 2, or
The total amount of the organic-based acrylic particles and the inorganic silicon particles of 1.2 to 2.1% by weight based on the total weight of the composition, or
Dispersing the organic-based acrylic particles having an average particle size of 2.3 to 3.2 占 퐉 as a whole and the inorganic silicon particles through a chamber-type melt compaction process to prepare a light diffusion film composition; and
And forming the light diffusion film composition by multilayer coextrusion blow molding.

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