KR101430051B1 - Improved heat retention and insulation films for agriculture - Google Patents

Improved heat retention and insulation films for agriculture Download PDF

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Publication number
KR101430051B1
KR101430051B1 KR1020140071542A KR20140071542A KR101430051B1 KR 101430051 B1 KR101430051 B1 KR 101430051B1 KR 1020140071542 A KR1020140071542 A KR 1020140071542A KR 20140071542 A KR20140071542 A KR 20140071542A KR 101430051 B1 KR101430051 B1 KR 101430051B1
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South Korea
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component
agricultural film
aerogel
lldpe
parts
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KR1020140071542A
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Korean (ko)
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김수봉
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김수봉
주식회사 대원솔라
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Priority to PCT/KR2015/005343 priority patent/WO2015190724A1/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Protection Of Plants (AREA)
  • Greenhouses (AREA)

Abstract

The present invention relates to an agricultural film having improved heat retaining and insulating properties. One or more polyethylene-based polymer resins selected from low density polyethylene (LDPE) or linear low density polyethylene (LLDPE) include: as a second component, surface-modified hydrophilic aerogel or sylilated aerogel having a porosity of 80-99.8%, a particle size of 10-100 nm, and a refractive index of 1.007-1.05; and as a third component, one or more components selected from a polymer (LLDPE-g-MAH) produced by grafting LLDPE with maleic anhydride, polyethylene wax, and silicon denatured polyethylene wax.

Description

TECHNICAL FIELD [0001] The present invention relates to an agricultural film composition having improved heat retention and insulation, and an agricultural film prepared therefrom.

TECHNICAL FIELD The present invention relates to agricultural films, and more particularly to agricultural film compositions used for greenhouses for cultivation of crops in vinyl houses, tunnels and the like, and agricultural films produced therefrom.

Greenhouse cultivation, in which crops and horticultural crops are grown using houses or tunnels, is used to artificially control the cultivation environment suitable for cultivation of crops, thereby cultivating the crops in a period in which cultivation is impossible or in a period in which productivity is low, Therefore, it is very important to install the facilities such as greenhouses and tunnels for greenhouse cultivation in consideration of characteristics for maintaining the cultivation environment such as solar light transmittance, thermal insulation, and thermal insulation, since it is necessary to maintain an environment suitable for cultivation of crops.

Polyvinyl chloride film, polyethylene film and ethylene-vinyl acetate copolymer film are mainly used for greenhouse cultivation and tunnels. In addition, additives for improving the functionality are added to the film production process, or two or more films are laminated Thereby improving the characteristics of the environment.

Background Art [0002] Prior art relating to agricultural films used for greenhouse cultivation, for example, in vinyl houses and tunnels is disclosed in Korean Patent Registration No. 10-0416863, for example, by blending a complex hydroxide condensed silicate specific to vinyl chloride resin, Discloses an excellent agricultural film having excellent thermal insulation properties and transparency. In a Korean Registered Patent Publication No. 10-0519401, a synthetic resin selected from the group consisting of ethylene-vinyl acetate copolymer, low-density polyethylene, linear low-density polyethylene, Absorbing agent, an average particle size of 2 to 20 占 퐉, hollow alumina silica-based hollow inorganic particles containing iron oxide are blended so that the ultraviolet shielding property and the heat insulating property are complementarily increased. Publication No. 10-0984329 discloses poly 0.5 to 1.0 part by weight of a near infrared absorbing dye and 0.01 to 0.2 part by weight of a fluorescent dye for light conversion are contained in 100 parts by weight of a synthetic resin base selected from ethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer resin and polyvinyl chloride resin Wherein the transmittance in the near infrared region of from 750 nm to 1,200 nm is 40 to 60%.

The present invention has been accomplished by developing a molding composition of an agricultural film suitable for a vinyl house, tunnel for greenhouse cultivation from an agricultural film composition with improved thermal insulation and heat insulation.

The present invention relates to an agricultural film composition used for greenhouse cultivation of agricultural crops, such as a vinyl house, a tunnel, etc., and an agricultural film produced therefrom. More specifically, the present invention relates to an agricultural film used for greenhouse cultivation, And to provide an agricultural film composition and an agricultural film produced therefrom that have improved heat insulation and heat insulation properties in accordance with visible light and infrared transmittance of the agricultural film.

An agricultural film composition having improved thermal insulation and heat insulation as a solution for achieving the object of the present invention includes an aerogel and a polymer obtained by grafting linear low density polyethylene (LLDPE) with maleic anhydride to a polyethylene-based polymer resin (PE-g- MAH) or an olefin wax, and more specifically, (a) at least one component selected from low density polyethylene (LDPE) and linear low density polyethylene (LLDPE) (B) 20 to 50 parts of a silylated aerogel or a surface modified hydrophilic aerogel (Aerogel) as a second component; (c) a linear low density polyethylene (LLDPE) as a third component; ) (PE-g-MAH) grafted with maleic anhydride anhydride, and (d) 2 to 8 parts of a polyethylene wax and a silicone-modified poly It is made to contain the one or more components selected from one to two parts by the wax is not blended or blended, is made to be added to the composition of a functional aid.

The low density polyethylene (LDPE) and the linear low density polyethylene (LLDPE), which are the first component according to the present invention, are a polyethylene resin produced by polymerizing ethylene, and the low density polyethylene (LDPE) (LLDPE) has characteristics of low-density polyethylene (LDPE) and low-density polyethylene (LDPE). It is widely used as food bags, shopping bags and agricultural films because of its low temperature resistance, electrical insulation, chemical resistance, But it is higher than LDPE in terms of strength and has excellent optical properties and is widely used as an agricultural film for commercial use, for tunnels, for thermal insulation mats, and the like.

Aerogel, which is a second component of the agricultural film composition of the present invention, is a low-density material having a nanoporous structure, and has high light transmittance and thermal conductivity, and has a melting point of 1000 ° C or higher. Heat insulating material, noise shielding material, etc. In the present invention, the porosity is 80 to 99.8%, the particle size is 10 to 100 nm, and the refractive index is 1.007 to 1.05. And a silylated aerogel or a surface modified hydrophilic aerogel having a thermal conductivity of 10 to 20 mW / mK.

Since the silylated aerogel has higher hydrophobicity due to the silylating agent than Aerogel, the silylated aerogel is more hydrophobic than Aerogel and can protect the pores of the Aerogel from the moisture in the air. Therefore, The porous property of the aerogel can be more completely realized.

In addition, the surface-modified hydrophilic aerogel is a hydrophilic modified surface of an airgel by a surfactant. Only the surface of the aerogel is hydrophilized and uniformly mixed with an organic material. When mixed with an organic material, a hydrophilic surfactant It is possible to prevent the organic material from penetrating into the airgel voids by the film, thereby maintaining the high specific surface area and porosity of the airgel, thereby realizing the characteristics inherent to the airgel.

The silylated aerogels or surface modified hydrophilic aerogels are commercially available (ISA Corporation, REMTECH, etc.) as a well-known substance. The higher the blending amount, the higher the heat insulation and the heat insulation property. However, the low density polyethylene (LDPE) Since the density is very low as compared with that of low density polyethylene (LLDPE), the mixing ability is deteriorated by 50% or more in a volume fraction, so that it is difficult to uniformly mix and deteriorate the heat retaining property and the heat insulating property. Therefore, the preferable blending amount of the aerogels is And 20 to 50 parts based on 100 parts of the resin .

The polymer (LLDPE-g-MAH) obtained by grafting linear low density polyethylene (LLDPE), which is the third component selected in the present invention, with maleic anhydride anhydride has a high affinity with the polyethylenic resin, and particularly low density polyethylene (LDPE) (LLDPE) and a silylated aerogel or a surface-modified hydrophilic aerogel (Aerogel) to obtain a uniform molded mixture, which is a component suitable for maintaining the characteristics of the airgel, and the mixing ratio Is preferably 2 to 8 parts by volume with respect to 100 parts by volume of the polyethylene-based resin.

The polyethylene wax or the silicone-modified polyethylene wax as the fourth component is a component that improves the lubricity and releasability when formed into a film using the film composition. In addition, when the aerogels and the added functional adjuvant are added, (LLDPE-g-MAH) obtained by grafting linear low density polyethylene (LLDPE), which is the third component, with maleic anhydride anhydride, and the fourth component is blended according to the blending of the polymer When blending, the blending ratio is preferably 1 to 2 parts by volume with respect to 100 parts by volume of the polyethylene resin.

The agricultural film composition according to the present invention may further comprise a functional adjuvant as an additional component. The functional adjuvant may further comprise one or more components selected from a UV screening agent, an antioxidant, an antistatic agent and a heat stabilizer, 1 to 2 parts per 100 parts of the polyethylen resin.

Further, the agricultural film of the present invention is used for a green house or a tunnel for greenhouse cultivation of a horticultural crop or a crop, Since the heat inside the house raised by the light transmission is not lost to the outside, the insulation is very excellent.

The present invention relates to a process for the preparation of a low-density polyethylene or linear low-density polyethylene and a process for preparing a polymer composition (LLDPE-g-MAH) which comprises grafting linear low density polyethylene (LLDPE) Is improved and the inherent characteristics of the airgel are secured without adversely affecting the physical properties by the molding of the film so that the heat inside the house raised by the light transmission is not externally lost and the heat insulating property and the heat insulating property are improved It has the characteristic of being able to produce agricultural film

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph comparing the temperature changes of a vinyl house with heating of an agricultural film of the present invention. FIG.
FIG. 2 is a graph showing a comparative test of changes in the inner temperature of a greenhouse according to sunlight transmission of the agricultural film of the present invention. FIG.

Hereinafter, the present invention will be described in more detail with reference to Examples and Test Examples, and the present invention is not limited by the following description, and the units of the parts and percentages used in the present invention are not limited thereto unless otherwise specified. will be.

<Examples>

A molding composition having a composition ratio as shown in Table 1 below was melted and kneaded and then pelletized to prepare a master batch. Then, a 50 탆 thick agricultural film was produced by a conventional film forming method.


ingredient Composition ratio (unit: subcutaneous) Example 1 Example 2 Example 3 Where to buy LDPE resin 100 100 100 Comet chemistry Silylated aerogels 50 25 - ISA Corporation Hydrophilic aerogels - - 25 REM Tech Co., Ltd. LLDPE-g-MAH 6 3 3 Welcome Tech Olefin wax - One 2 Comet chemistry Silylated olefin wax - 2 Comet chemistry

&Lt; Test Example 1 >

For the warming test by heating, a simple vinyl house made of the agricultural film prepared in Example 1 and the commercially available agricultural film of 1 m x 1 m x 1 m (width x height x height) was installed in the room, The inside of the house was heated for about 1 hour by a heater of 350 W / h, and the temperature change in the interior of the greenhouse was observed. The results are shown in Table 2 below and attached as Fig. 1


division Temperature over time (℃) start 10 minutes 20 minutes 30 minutes 40 minutes 50 minutes 60 minutes Test Example 1 26.4 29.0 31.5 33.1 33.9 34.4 34.6 Comparative Example 1 26.4 28.2 29.4 29.8 30.1 30.2 30.2

As shown in the above Table 2, although the simple test for a vinyl house having a volume of 1 m 3 was conducted, the internal temperature of the vinyl house of the present invention was 4.4 ° C It can be seen that the agricultural film of the present invention exhibits low heat loss during the heating process due to the effect of improving the heat insulation property and the warming property, It is possible to predict that the required expenditure can be saved.

&Lt; Test Example 2 &

For the test of the temperature change of the inside of the house by the sunlight permeation, the greenhouse made of the agricultural film and the agricultural film prepared in Example 3 were each 1 m x 1 m x 1 m (width x height x height) After exposure to the sun for a period of time (about 6:00 on June 6, 2014), the temperature changes in each of the greenhouses were observed and the results are shown in Table 3 below and attached in FIG.


division Temperature over time (℃) start 10 minutes 20 minutes 30 minutes 40 minutes 50 minutes 60 minutes Test Example 2 30.2 39.3 42.7 44.2 45.5 44.1 43.9 Comparative Example 2 30.5 36.8 41.4 43.8 44.0 43.8 37.3

According to the above-mentioned Table 3, it can be confirmed that the temperature of the inside of the house due to the sunlight transmission also keeps the temperature of the agricultural film of the present invention higher than that of the comparative example. It can be predicted that the infrared transmittance and the heat insulating property are higher than those of the comparative example, and thus it can be seen that the agricultural film of the present invention is advantageous in terms of energy efficiency.

Claims (5)

(a) 100 parts of at least one polyethylene polymer resin selected from Low Density Polyethylene (LDPE) and Linear Low Density Polyethylene (LLDPE) as a first component,
(b) 20 to 50 parts of at least one component selected from surface-modified hydrophilic aerogels (Aerogel) and silylated aerogels (Aerogel) as the second component,
(c) 2-8 parts of a polymer (LLDPE-g-MAH) grafted with linear low density polyethylene (LLDPE) as maleic anhydride as a third component,
(d) 1 to 2 parts of at least one component selected from polyethylene wax and silicone modified polyethylene wax as the fourth component. The agricultural film composition with improved thermal insulation and heat insulation is characterized by containing or not blending the skin. The agricultural film composition according to claim 1, wherein at least one component selected from the group consisting of a UV screening agent, an antioxidant, an antistatic agent and a thermostability agent is added to the agricultural film composition as 1 to 2 parts of skin for 100 parts of polyethylenepolymer resin Characterized in that the composition is an agricultural film composition having improved thermal insulation and thermal insulation. The method according to claim 2, wherein the second component is a silylated aerogel having a porosity of 80 to 99.8%, a particle size of 10 to 100 nm, a refractive index of 1.007 to 1.05, and a fourth component is a silicone modified polyethylene wax Wherein the water-insoluble and water-insoluble antioxidants are added to the composition. The method according to claim 2, wherein the second component is a surface-modified hydrophilic aerogel (Aerogel) having a porosity of 80 to 99.8%, a particle size of 10 to 100 nm and a refractive index of 1.007 to 1.05, and the fourth component is a polyethylene wax An agricultural film composition improved in thermal insulation and insulation. An agricultural film having improved thermal insulation and heat insulation, which is produced by molding the agricultural film composition of any one of claims 1 to 4.
KR1020140071542A 2014-06-12 2014-06-12 Improved heat retention and insulation films for agriculture KR101430051B1 (en)

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KR1020140071542A KR101430051B1 (en) 2014-06-12 2014-06-12 Improved heat retention and insulation films for agriculture
PCT/KR2015/005343 WO2015190724A1 (en) 2014-06-12 2015-05-28 Agricultural film composition having improved warmth-retaining and insulation properties, and agricultural film manufactured therefrom

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100416863B1 (en) 1995-06-23 2004-05-06 토다 고교 가부시끼가이샤 Complex hydroxide condensed silicate, preparation method thereof, infrared absorber and agricultural film
KR100519410B1 (en) 2001-04-30 2005-10-07 주식회사 네비콤 Satellite signal correlator of gps receiver
KR20090085941A (en) * 2008-02-05 2009-08-10 욱성화학주식회사 Functional film for agricultural with selective permeability of light

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100519401B1 (en) * 2004-05-19 2005-10-06 (주)청암산업 Plastic film for shielding ultraviolet ray and heat
KR20080003904U (en) * 2007-03-12 2008-09-18 남택중 Protection Sheet For Heating Film

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100416863B1 (en) 1995-06-23 2004-05-06 토다 고교 가부시끼가이샤 Complex hydroxide condensed silicate, preparation method thereof, infrared absorber and agricultural film
KR100519410B1 (en) 2001-04-30 2005-10-07 주식회사 네비콤 Satellite signal correlator of gps receiver
KR20090085941A (en) * 2008-02-05 2009-08-10 욱성화학주식회사 Functional film for agricultural with selective permeability of light

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