JP2004041223A - Polyolefin-based resin mulch film and method for cultivating plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyolefin-based resin mulch film used for a protected horticulture house and plastic tunnel culture, capable of being prevented from being deteriorated, even when the film is used in treating the soil and/or plants with an inorganic sulfur agent, and to provide a method for cultivating the plants. <P>SOLUTION: This polyolefin-based resin mulch film contains a hindered amine-based compound, a hydrotalcite compound, and an ultraviolet light absorber, wherein the film is used in subjecting the soil and/or the plants to bactericidal and insecticidal treatment with the inorganic sulfur agent. Thus, the plants are stably cultivated for a long period. Further, the plants, such as strawberry, melon, watermelon, cucumber, rose, potted flowers, and fern, are cultivated by reduced organic pesticide farming to which electrically-heated sulfur smoking is applied. <P>COPYRIGHT: (C)2004,JPO

Description

{Circle over (1)} The present invention relates to a coated film that does not deteriorate even if soil and / or plants are sterilized or killed with an inorganic sulfur agent in greenhouse horticulture / tunnel cultivation, its use, and a plant cultivation method.

Conventionally, polyolefin resin films such as polyvinyl chloride films, polyethylene films, and ethylene-vinyl acetate copolymer films have been mainly used as coating films used for houses, tunnels, and the like in greenhouse horticulture. These are generally known as agricultural vines, agricultural poly, and agricultural radish and are widely used for greenhouse horticulture. In particular, agricultural rice is overwhelmingly used in Japan for coating.

The purpose of greenhouse horticulture is to artificially adjust the cultivation environment of the crop to create a suitable environment for the crop, to enable cultivation when the open-field cultivation is not possible, and to increase the productivity when the productivity is low. Is about to give. Therefore, it is necessary to know the correlation between environmental factors (light, temperature, humidity, carbon dioxide concentration, water, soil, etc.) and the viability of crops, and to form a suitable production environment while considering economic efficiency.

性能 The required performance of the covering material, which is essential for the formation of an artificial space called a facility, varies depending on the intended use, intended use, and the target crop. The primary properties required of primary coating materials for houses and tunnels and coating materials such as thermal insulation curtains are weather resistance (performance that can withstand long-term outdoor use in sunny conditions) and dripping properties (house and tunnel interior Due to high humidity, the inner surface of the coated film is covered with minute water droplets due to dew condensation, which prevents the phenomenon of deteriorating transparency), heat retention (the ability to keep the temperature inside the facility high at night), and translucency ( Transparency).

On the other hand, given the growing public opinion on global environmental issues, polyolefin resin-coated films that can be completely burned more easily and have no fear of harmful gases than polyvinyl chloride-coated films (agricultural plastic) that generate hydrochloric acid gas during waste incineration. Is attracting attention.
In addition, polyolefin resin-coated films are superior to agricultural plastics in mechanical properties (tear strength, cold resistance, etc.), weather resistance, heat stability, etc. Is progressing.

However, it has been found that, after spreading a polyolefin-based resin-coated film for agriculture, which has become widespread in recent years, the durability of the film is remarkably inferior due to the pesticides used in crops after being spread on a greenhouse or the like. As a countermeasure, JP-A-63-175072 discloses an organic pesticide in which a hindered amine compound and a hydrotalcite compound are blended in a thermoplastic resin when an organic sulfur-based, organic chlorine-based, or organic phosphorus-based pesticide is used. Agricultural films with excellent resistance are disclosed.

In recent years, with the trend toward consumer safety and naturalism, there has been a tendency to further reduce pesticides. Inorganic sulfur agents that have a very long history of fungicides, namely lime-sulfur mixture, sulfur powder, water Japanese sulfur agents, sulfur smoke agents, etc. tend to be heavily used in response to consumer safety and nature-oriented trends.
Even when these inorganic sulfur agents are used, similarly to the case where an organic pesticide is used, the weather resistance deterioration of the polyolefin resin coated film for agriculture often occurs, and the heat described in JP-A-63-175072 is used. It has been found that even an agricultural film in which a hindered amine compound and a hydrotalcite compound are blended in a plastic resin cannot always maintain sufficient weather resistance when an inorganic sulfur agent is used.
In particular, fruit tree cultivation is perennial, and it is a very serious problem that the film is broken due to deterioration at an important time of cultivation such as fruit setting.
An object of the present invention is to provide a horticultural house / tunnel made of a coating film based on a polyolefin-based resin that is environmentally friendly, by using an inorganic sulfur agent to reduce polyorganic horticultural house / tunnel cultivation of a low organic pesticide. It is to provide a resin-coated film.

The present inventors have conducted intensive research on agricultural coating films, especially agricultural horticultural methods for agricultural coating films based on polyolefin resins and low organic pesticides using the same, and as a result, hindered amine compounds When treating soil and / or plants with an inorganic sulfur agent in a house tunnel with a coated film of an agricultural polyolefin-based resin film containing a hydrotalcite compound and an ultraviolet absorber, the above-mentioned problem of weather resistance deterioration is solved. The present inventors have found that it is possible to cultivate crops that have been eliminated, and have completed the present invention.

That is, the present invention is a polyolefin-based resin-coated film containing a hindered amine compound, a hydrotalcite compound and an ultraviolet absorber, and is a polyolefin-based plant for horticultural greenhouse and tunnel cultivation in which soil and / or plants are treated with an inorganic sulfur agent. It is intended to provide a resin-coated film, a treatment method using the polyolefin-based resin-coated film for cultivating a greenhouse and a tunnel, and a method for cultivating a plant.

In house and tunnel cultivation using the polyolefin-based resin-coated film for greenhouse horticulture and tunnel cultivation of the present invention, when soil and / or plants are treated with an inorganic sulfur agent, the decrease in weather resistance of the coated film that is normally caused is significantly suppressed. It is possible to reduce organic pesticides. In particular, fruit tree cultivation is perennial, and it is a very serious problem that the film is broken due to deterioration at important times of cultivation such as fruit setting, but by using the coated film of the present invention, it is stable for a long time. Cultivation can be achieved. Furthermore, the present invention also enables organic pesticide reduction cultivation using electrothermal sulfur smoke such as strawberry, melon, watermelon, cucumber, rose, potted flowers, and fern.
According to the present invention, it is possible to provide a polyolefin-based resin-coated film that is resistant to an inorganic sulfur agent and is environmentally friendly, and enables cultivation of crops with significantly reduced organic pesticides.
Further, the film of the present invention can be used as a mulching film.

Hereinafter, the present invention will be described in detail.
The hindered amine compound used in the present invention is preferably a 2,2,6,6-tetraalkylpiperidine derivative having a molecular weight of 250 or more and having a substituent at the 4-position, wherein the substituent at the 4-position is Is, for example, a carboxylic acid residue, an alkoxy group, an alkylamino group and the like, and the N-position may be substituted with an alkyl group.
Specifically, compounds represented by the following formulas (1) to (22) can be exemplified.

The amount of the hindered amine compound used in the present invention is preferably 0.02% by weight or more in the polyolefin resin coated film from the viewpoint of weather resistance. The content is preferably 5% by weight or less from the viewpoint of suppressing the appearance of the film, particularly the blooming phenomenon. More preferably, it is 0.1 to 2% by weight.
These hindered amine compounds may be used alone or in combination of two or more.
Among the hindered amine compounds, for example, the compounds represented by the above formulas (6) to (8) are particularly preferable in terms of the weather resistance and appearance of the obtained coated film.

The hydrotalcites used in the present invention are represented by the general formula (1)
M 2 ⁺ _{1 -x} Al _x (OH) ₂ (A ^n- ) _{x / n} · mH ₂ O (1)
( ^Wherein M ²⁺ represents a divalent metal ion selected from the group consisting of magnesium, calcium and zinc, and x and m represent the following conditions: 0 <x <0.5, 0 ≦ m ≦ 2) Satisfied, ^An- represents an n-valent anion.)
It is a compound shown by these.
is not particularly limited to n-valent ^{anion, Cl -, Br -, I} -, NO 3 - Cl O 4 -, SO 4 2-, CO 3 2-, SiO 3 2-, HPO 4 3-, HBO _{^{4 3-, PO 4 3-, Fe}} (CN) 4 3-, Fe (CN) 4 4-, CH3 COO -, C 6 H 4 (OH) COO -, (COO) 2 2-, terephthalate ion, Anions such as naphthalenesulfonate ion are exemplified.
Specific examples thereof include natural hydrotalcite _{(Mg 0.75 Al 0.25 (OH)} 2 (CO 3) 0.125 · 0.5 H 2 O), synthetic hydrotalcite _{(Mg 0.69 Al 0. 31 (} OH) 2 (CO 3 ) _{0 15} · 0.54H ₂ O Product name:. DHT-4A manufactured by Kyowa chemical industry Co., Ltd.), and the like.

The amount of the hydrotalcite compound used in the present invention is preferably 0.1% by weight or more in the polyolefin-based resin-coated film in view of the effect of improving weather resistance. From the viewpoint of film transparency and film strength, the content is preferably 25% by weight or less. A more preferred amount is 1 to 10% by weight.
The average particle size of the hydrotalcite compound is 5 μm or less, preferably 0.05 to 2 μm, in view of the transparency of the obtained coated film.
In order to improve the dispersibility in the film, the hydrotalcite compound may be subjected to a surface treatment with a higher fatty acid, an alkali metal salt of the higher fatty acid, or the like.

紫外線 The ultraviolet absorber used in the present invention is roughly classified into a benzophenone ultraviolet absorber, a benzotriazole ultraviolet absorber, a benzoate ultraviolet absorber, and a cyanoacrylate ultraviolet absorber. Specifically, for example, compounds represented by the following formulas (23) to (31) are exemplified.

配合 The blending amount of the ultraviolet absorber used in the present invention is preferably 0.01% by weight or more in the polyolefin resin-coated film from the viewpoint of improving the weather resistance. From the viewpoint of suppressing the appearance of the film, particularly the blooming phenomenon, the content is preferably 3% by weight or less. A more preferred compounding amount is 0.05 to 1% by weight. These UV absorbers may be used alone or in combination of two or more.

Examples of the polyolefin resin used in the present invention include a homopolymer of ethylene such as polyethylene and polypropylene or an α-olefin having 3 to 10 carbon atoms, an ethylene-propylene copolymer, an ethylene-butene-1 copolymer, and an ethylene-olefin. 4-methyl-1-pentene copolymer, ethylene-hexene copolymer, ethylene-octene copolymer and other copolymers of ethylene and an α-olefin having 3 to 10 carbon atoms, ethylene-vinyl acetate copolymer , Ethylene-acrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-vinyl acetate-methyl methacrylate copolymer, ionomer resin, etc. And the like.

Among these resins, polyethylene, especially low-density polyethylene having a density of 0.93 g / cm ³ or less, ethylene-α-olefin copolymer or ethylene-vinyl acetate copolymer having a vinyl acetate content of 30% by weight or less, etc. Is preferred because it is excellent in transparency and flexibility, and an inexpensive film can be obtained.

厚 み The thickness of the polyolefin resin-coated film of the present invention is preferably 0.02 mm or more from the viewpoint of the strength of the film, and is preferably 0.3 mm or less from the viewpoint of the secondary workability such as the splicing workability and the coating workability. A more preferred film thickness is from 0.03 to 0.2 mm.

In the coated film of the present invention, various additives such as a dropping agent, a heat stabilizer, a weathering agent, an ultraviolet absorber, a filler, an anti-fog agent, a lubricant, and a coloring agent, as long as the object of the present invention is not impaired. Can be added.

For example, a dropping agent added for the purpose of preventing the phenomenon that the transparency of the film is deteriorated due to the inner surface of the coated film of the present invention being covered with minute water droplets due to condensation is a solid at room temperature (23 ° C.). And liquid.
Solid dropping agents include nonionic surfactants such as sorbitan monostearate, sorbitan monopalmitate, sorbitan fatty acid ester surfactants such as sorbitan monobehenate, glycerin monolaurate, glycerin monopalmiate. Glycerin fatty acid ester surfactants such as tate, glycerin monostearate, diglycerin distearate, triglycerin monostearate, polyethylene glycol surfactants such as polyethylene glycol monopalmitate and polyethylene glycol monostearate, and alkylphenols Examples include an alkylene oxide adduct, an ester of a sorbitan / glycerin condensate and an organic acid, and the like.
Examples of the liquid dropping agent include glycerin monooleate, diglycerin monooleate, diglycerin sesquiolate, tetraglycerin monooleate, hexaglycerin monooleate, glycerin pentaolate, diglycerin pentaolate, tetraglycerin pentaolate, Examples include glycerin-based fatty acid esters such as glycerin pentaolate, tetraglycerin monolaurate, and hexaglycerin monolaurate, and sorbitan fatty acid esters such as sorbitan monooleate, sorbitandiolate, and sorbitan pentaolate.

Examples of the antifog include fluorine compounds having a perfluoroalkyl group, an ω-hydrofluoroalkyl group and the like (especially fluorine surfactants), and silicon compounds having an alkylsiloxane group (especially silicon surfactants). Can be
Examples of the heat stabilizer include hindered phenol compounds such as 2,6-dialkylphenol derivatives and 2-alkylphenol derivatives, sulfur compounds having a thiol bond or a thioether bond containing a divalent sulfur atom, and trivalent phosphorus atoms. And the like.
Examples of the weathering agent include a nickel compound.
Fillers include magnesium oxide, calcium oxide, aluminum oxide, silicon oxide, titanium oxide, lithium hydroxide, magnesium hydroxide, calcium hydroxide, aluminum hydroxide, magnesium carbonate, calcium carbonate, potassium sulfate, magnesium sulfate, and calcium sulfate. , Zinc sulfate, aluminum sulfate, lithium phosphate, sodium phosphate, potassium phosphate, calcium phosphate, magnesium silicate, calcium silicate, aluminum silicate, titanium silicate, sodium aluminate, potassium aluminate, calcium aluminate, sodium aluminosilicate, potassium aluminosilicate , Calcium aluminosilicate, kaolin, talc, clay and the like are used, respectively.

The polyolefin-based resin-coated film of the present invention may be a single layer or a multilayer film, and the resin and additives in each layer may be different in blending.
In the case of a multilayer structure, each layer is composed of a polyolefin resin composition containing at least one of a hindered amine compound, a hydrotalcite compound and an ultraviolet absorber. The composition of the resin and additives in each layer may be different, and a composition of three or three layers or two or three layers is often used. The layer facing the outside of the facility has a dustproof treatment and the layer facing the inside faces the facility. For the layer, a drip-proof and fog-proof treatment may be used, and for the intermediate layer, a heat insulating agent mainly containing an inorganic filler or the like may be used.

Examples of the method of the droplet treatment include a method of forming an antifogging (dripping) coating on at least the inner surface (the surface facing the inside of the facility) of the film, in addition to the method of mixing the droplet agent described above. .
Such anti-fog coatings include, for example, coating films of inorganic oxide sols such as colloidal silica and colloidal alumina described in JP-B-49-32668 and JP-B-50-11348, and their applications. JP-A-63-45432, JP-B-63-45717, JP-B-64-02158 and JP-A-3-207643 disclose inorganic oxide sols and organic compounds (such as surfactants and resins). Coating film, coating film of liquid containing surfactant as a main component, film containing hydrophilic resin as a main component (the hydrophilic resin used here includes polyvinyl alcohol, polysaccharide, polyacrylic acid, etc. As a forming method, a coating method or a method in which a film mainly composed of a hydrophilic resin is formed and then laminated on the film may be used. Further, two or more of these antifogging covering films may be laminated.

ポ リ The polyolefin resin-coated film of the present invention is produced, for example, by the following method. Predetermined amounts of hindered amine compounds, hydrotalcite compounds, UV absorbers and, if necessary, various additives such as dropping agents, heat stabilizers, weathering agents, etc., are added to the polyolefin resin, for example, ribbon blender, super mixer, banbury The film can be mixed and kneaded by a usual mixing and kneading machine such as a mixer, a single screw or twin screw extruder, and then a film can be produced by a normal forming method such as an extrusion T-die film forming method and an inflation film forming method. .

The polyolefin resin-coated film obtained by the above method is suitably used as a coating film for a greenhouse horticultural house tunnel.
The facility horticulture house tunnel used in the present invention is generally used by farmers and the like, and is covered with the polyolefin resin-coated film of the present invention. The film can also be used when a lining curtain is installed in a facility gardening house / tunnel.

Examples of the inorganic sulfur agent used in the present invention include a lime sulfur mixture, a sulfur powder, a hydrated sulfur agent, a sulfur smoke agent, and a lime sulfur aerosol.
These inorganic sulfur agents are described in the Pesticide Handbook 1985 Edition (Agricultural Chemical Handbook 1985 Edition Editorial Board, edited by the Japan Plant Protection Association, 1985). Its mode of action is due to the blocking of the electron transport system of pathogenic bacteria by elemental sulfur, which inhibits the ATP synthesis of the bacteria and kills them. It has a fungicidal effect on rust and powdery mildew, and has an insecticidal effect on spider mites and scale insects.Apples, oysters, cuts, peaches, grapes, oranges Applicable to fruit trees, strawberries, melons, watermelons, cucumbers, vegetables, hops, wheat, roses, chrysanthemums, sweet pea, tea, pine, mulberry, turf, etc. (The use and method of use are described in more detail.) ", Which is mainly used for the treatment of soil and / or plants for the purpose of sterilization and insecticide. It is.

The method of treating soil and / or plants with the inorganic sulfur agent of the present invention generally means that the inorganic sulfur agent is at least once in a facility horticultural house tunnel covered with the above-mentioned polyolefin resin-coated film of the present invention. The spraying time may be any time before or after the start of cultivation of the plant to be cultivated.
The method and amount described in the above pesticide handbook can be applied mutatis mutandis to the method and amount of application of the inorganic sulfur agent.

The plant horticulture greenhouse / tunnel cultivation method of the present invention is a cultivation method characterized by treating soil and / or plants with the above-mentioned inorganic sulfur agent.植物 Plants to be cultivated include, for example, fruit trees such as apples, oysters, pears, thighs, grapes, tangerines, etc., strawberries, melons, watermelons, cucumber, roses, chrysanthemums and the like. As the inorganic sulfur agent, a lime-sulfur mixture, a hydrated sulfur agent, a sulfur smoke agent and the like as described above are preferably used. The inorganic sulfur agent contains a naturally occurring sulfur element and is used for the purpose of reducing the frequency of spraying organic pesticides. In particular, electrothermal sulfur fumigation has a great effect on the reduction of organic pesticides in the cultivation of roses (mildew, spider mite), strawberries (mildew, spider mite, gray mold) and chrysanthemum (white rust). . A lime-sulfur mixture is preferably used for cultivation of fruit trees such as oysters, grapes and oranges.

Hereinafter, examples of the present invention will be described, but the present invention is not limited thereto. The test methods in the examples are as follows.
(Weather resistance test)
A test piece punched out with a JIS No. 1 dumbbell was immersed in a lime-sulfur mixture (a 27.5% aqueous solution of calcium polysulfide, manufactured by Hokuko Chemical Co., Ltd.) diluted 7-fold with water for 24 hours, followed by washing and drying. The test piece was exposed to light over time at a black panel temperature of 63 ° C. using a Sunshine Weather O Meter (manufactured by Suga Test Instruments Co., Ltd.). With respect to the aged test piece, a tensile test was performed using an Autograph DSS100 (manufactured by Shimadzu Corporation) to measure the elongation (%), and the elongation became half that of the original test piece. The weather resistance test time (hereinafter referred to as “weather resistance half-life”) was determined. The larger the value of this time, the better the weather resistance, and 1000 hours was regarded as a pass level of this test.
Elongation (%) = [distance between marked lines at break (mm) −distance between marked lines before tensile test (mm)] ÷ [distance between marked lines before tensile test (mm)] × 100

(Example 1)
Ethylene-vinyl acetate copolymer (trade name Evatate H2020, vinyl acetate content 15% by weight, manufactured by Sumitomo Chemical Co., Ltd.), hindered amine compound A (trade name, Tinuvin 622-LD, manufactured by Ciba Geigy) 0.6% by weight, hydrotalcites 8.0% by weight of compound (trade name: DHT-4A manufactured by Kyowa Chemical Industry), 0.1% by weight of ultraviolet absorber (trade name: Sumisorb 130, manufactured by Sumitomo Chemical), antioxidant R (trade name: Irganox 1010, manufactured by Ciba Geigy) 0 0.1% by weight, 1.4% by weight of monoglycerin monostearate as an antifogging agent, 0.6% by weight of diglycerin distearate, 0.2% by weight of stearamide as a lubricant (both in the resin composition) %), And kneaded at 130 ° C. for 5 minutes using a Banbury mixer, and then granulated by a granulator to obtain a composition pellet. I got it. This is referred to as a resin composition (1).
Next, an ethylene-vinyl acetate copolymer (trade name: Evate D2011, vinyl acetate content: 5% by weight, manufactured by Sumitomo Chemical Co., Ltd.), a hindered amine compound A: 0.6% by weight, and an ultraviolet absorber (trade name: Sumisorb 130, manufactured by Sumitomo Chemical) 0.1% by weight, 0.1% by weight of antioxidant R, 1.4% by weight of monoglycerin monostearate, 0.6% by weight of diglycerin distearate, 0.2% by weight of stearamide (all of which have a resin composition Weight% in the product) was added to obtain pellets in the same manner as the resin composition (1). This is referred to as a resin composition (2). Using a resin composition (1) as an intermediate layer and a resin composition (2) as both outer layers, a film having a film thickness of 100 μm (intermediate layer: 60 μm, both outer layers: 20 μm) was prepared by an inflation film molding machine, and subjected to a weather resistance test. . The results were excellent as shown in Table 1.

(Examples 2 to 4)
A film was obtained and subjected to a weather resistance test in the same manner as in Example 1 except that the composition was as shown in Table 1. The results were excellent as shown in Table 1.

(Example 5)
Example 1 was the same as Example 1 except that the resin compositions (1) and (2) were each further added with 0.1% by weight of a fluorine-based surfactant (trade name: Unidyne RS403, manufactured by Daikin Industries) as an antifog agent. A film was obtained in the same manner and subjected to a weather resistance test. The weather resistance half-life was 1000 hours or more.

(Comparative Examples 1-4)
A film was obtained and subjected to a weather resistance test in the same manner as in Example 1 except that the composition was as shown in Table 1. The results were inferior as shown in Table 1. (However, when the lime-sulfur mixture solution was not immersed in the weather resistance test, the weather resistance half life was 1000 hours or more in all cases except Comparative Example 3.)

(Example 6)
Vine cultivation test in a house coated with the film of Example 1 (Shimane Prefecture: Delaware, East-West Wing AP House, cultivated between February and August 1994, and once every February, a 20-fold diluted lime-sulfur mixture. Was sprayed at a rate of 100 liters per sheet.).
In August, the south side film was sampled, and a tensile test was performed according to the above-mentioned weather resistance test. As a result, both the tensile strength and the elongation were at least 90%, and there was no deterioration.

(Comparative Example 5)
The same procedure as in Example 5 was performed using the film of Comparative Example 1. The film was partially torn at the house aggregate.

(Example 7)
Strawberry cultivation test in a house coated with the film of Example 1 (Gifu Prefecture: Toyooka, East-West Wing AP House, cultivated from October to May 1993, and heated by electrothermal sulfur fumigant (trade name: Shin Konade) The fumigation method was as follows: fumigation was performed by installing one fumigation device per 100 m ^{3 in the} house and fumigation every day at a rate of 8 hours a day. The amount of powdery mildew, gray mold, spider mite, etc. was completely suppressed during the cultivation period, and the southern film was sampled in May, and a tensile test was conducted in accordance with the above weather resistance test. Both the tensile strength and the elongation were at least 90%, and there was no deterioration.

(Comparative Example 6)
The same procedure as in Example 6 was performed using the film of Comparative Example 1. As a result, both the tensile strength and the elongation were reduced to about 40% retention.

(Reference Example 1)
Ethylene-vinyl acetate copolymer (trade name Evatate H2020, vinyl acetate content 15% by weight, manufactured by Sumitomo Chemical Co., Ltd.), 0.3% by weight of hindered amine compound A (trade name, Tinuvin 622-LD, manufactured by Ciba Geigy), hydrotalcites 3.0% by weight of compound (trade name: Alkamizer DHT4A manufactured by Kyowa Chemical Industry), 0.1% by weight of ultraviolet absorber (trade name: Sumisorb 130, manufactured by Sumitomo Chemical), antioxidant R (trade name: Irganox 1010, manufactured by Ciba Geigy) 0 0.1% by weight, 1.4% by weight of monoglycerin monostearate as an antifogging agent, 0.6% by weight of diglycerin distearate, 0.2% by weight of stearamide as a lubricant (both in the resin composition) %), And kneaded at 130 ° C. for 5 minutes using a Banbury mixer, and then granulated with a granulator. A composition pellet was obtained. This is referred to as a resin composition (1). Next, an ethylene-vinyl acetate copolymer (trade name Evatate D2011)
A vinyl acetate content of 5% by weight (Sumitomo Chemical Industries), a hindered amine compound A (0.3% by weight), an ultraviolet absorber (trade name Sumisorb 130, manufactured by Sumitomo Chemical) 0.1% by weight, an antioxidant R 0.1% by weight, 1.4% by weight of monoglycerin monostearate, 0.6% by weight of diglycerin distearate, and 0.2% by weight of stearamide (all represent the weight% in the resin composition) were added to the resin composition. Pellets were obtained as in (1). This is referred to as a resin composition (2). Using a resin composition (1) as an intermediate layer and a resin composition (2) as both outer layers, a film having a film thickness of 100 μm (60 μm for the intermediate layer and 20 μm for both outer layers) is produced by an inflation film molding machine, and treated with a lime sulfur agent. Without performing, a weather resistance test was performed. The result was a weather resistance half-life of 950 hours.

(Reference Example 2)
A film having a film thickness of 100 μm (60 μm for the intermediate layer and 20 μm for both outer layers) is prepared in the same manner as in Reference Example 1 except that the ultraviolet absorber (Sumisorb 130, manufactured by Sumitomo Chemical Co., Ltd.) is not used, and the lime sulfur agent is treated. The weather resistance test was performed without any change. The result was a weathering half-life of 900 hours.

Claims (6)

A polyolefin-based resin-coated film containing a hindered amine compound, a hydrotalcite compound, and an ultraviolet absorber, wherein the soil and / or plant is treated with an inorganic sulfur agent. A polyolefin-based resin-coated film containing 0.02 to 5% by weight of a hindered amine compound, 0.1 to 25% by weight of a hydrotalcite compound, and 0.01 to 3% by weight of an ultraviolet absorber. And a polyolefin-based resin-coated film for facility horticulture and tunnel cultivation in which soil and / or plants are treated with an inorganic sulfur agent. The horticulture house for treating soil and / or plants with the inorganic sulfur agent according to claim 1 or 2, wherein the inorganic sulfur agent is a lime sulfur mixture, a sulfur powder, a hydrated sulfur agent, a sulfur smoke agent or a lime sulfur aerosol.・ Polyolefin resin coated film for tunnel cultivation. The polyolefin-based resin-coated film for cultivation of a horticultural greenhouse or a tunnel, wherein the plant is selected from the group consisting of strawberry, melon, watermelon, cucumber, rose and chrysanthemum. The polyolefin resin-coated film for cultivation of a horticultural greenhouse or a tunnel, wherein the plant is a fruit tree and the soil and / or the plant is treated with the inorganic sulfur agent according to any one of claims 1 to 3. Soil and / or fruit trees are treated with an inorganic sulfur agent in a facility horticulture house / tunnel covered with a polyolefin resin-coated film for cultivation of a facility horticulture house / tunnel containing a hindered amine compound, a hydrotalcite compound and an ultraviolet absorber. Cultivation method of orchards to be treated with.