JP4744841B2 - Agricultural film composition - Google Patents

Description

  The present invention relates to an agricultural film composition, and in particular, is excellent in weather resistance, chemical resistance and antifogging property, which is obtained by adding a specific triazine UV absorber and antifogging agent to a polyethylene thermoplastic resin. The present invention relates to an agricultural film composition.

  Polyethylene thermoplastic resins such as polyethylene and ethylene-vinyl acetate copolymers are widely used as agricultural films for houses, tunnels, etc. because they have excellent transparency, heat retention, mechanical strength and other physical properties. Yes. However, these resins have the disadvantage that they cannot withstand long-term use because they are deteriorated by ultraviolet rays, resulting in a decrease in transparency and damage.

  It is known that such deterioration of the film can be suppressed by adding an antioxidant, an ultraviolet absorber, a hindered amine compound, hydrotalcites and the like. For example, Patent Document 1 proposes stabilization with a benzoate UV absorber and a hindered amine compound, Patent Document 2 proposes stabilization with a hindered amine compound, and Patent Document 3 discloses a hindered amine compound and a triazine UV. Stabilization with an absorbent and improvement in transparency with an anti-fogging coating have been proposed.

  However, with any additive, the stabilization effect and transparency improvement effect are still not satisfactory, especially when pesticide spraying and sulfur fumigation are performed to control pests, Since the deterioration of the resin proceeds in a short period of time, further stabilization and improvement of transparency have been desired.

Japanese Patent Laid-Open No. 10-195258 Japanese Patent Laid-Open No. 10-219094 JP 2003-199437 A

  Accordingly, an object of the present invention is to provide an agricultural film composition excellent in weather resistance, chemical resistance and antifogging property, which can be suitably used as an agricultural film.

  As a result of intensive studies, the present inventors have found that the above problem can be solved by combining a triazine-based ultraviolet absorber having a specific structure and an antifogging agent, and have reached the present invention.

  That is, the present invention relates to (A) 100 parts by mass of a polyethylene-based thermoplastic resin, (B) 0.001 to 10 parts by mass of a triazine-based ultraviolet absorber represented by the following general formula (I), and (C) antifogging. The agricultural film composition formed by adding 0.001 to 10 parts by mass of the agent is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the agricultural film composition excellent in the weather resistance, the chemical resistance, and the fog prevention can be provided by adding a specific ultraviolet absorber and an antifogging agent to a polyethylene-type thermoplastic resin.

  Hereinafter, the present invention will be described in detail based on preferred embodiments.

  Examples of the polyethylene-based thermoplastic resin (A) used in the agricultural film composition of the present invention include low-density polyethylene, linear low-density polyethylene, high-density polyethylene, and other polyethylene, ethylene-vinyl acetate copolymers, Ethylene-α olefins such as ethylene-acrylate, ethylene-methacrylate, ethylene-methyl methacrylate, ethylene-ethyl acrylate, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-4-methyl-1-pentene copolymer Among them, polyethylene and ethylene-vinyl acetate copolymer are preferable because they are excellent in light transmittance and durability and do not generate harmful gas when incinerated.

(B) The triazine-based ultraviolet absorber represented by the above general formula (I) used in the agricultural film composition of the present invention has 1 to 7 carbon atoms represented by R ₁ in the above general formula (I). Examples of the alkyl group include methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, tert-butyl, isobutyl, amyl, isoamyl, tert-amyl, hexyl, 2-hexyl, 3-hexyl, heptyl, 2-heptyl, 3-heptyl, isoheptyl, tertiary heptyl, shea Kuropenchiru, 2-cyclopentylethyl, shea Kurohekishiru, shea Kurohepuchiru, 2 - methylcyclohexyl, 3-methylcyclohexyl, 4-methyl cyclohexylene Ru le, and the like.

  Specific examples of the triazine-based ultraviolet absorber represented by the general formula (I) include the following compound No. 1-No. 9 compounds are mentioned. However, the present invention is not limited by the following compounds.

  The triazine-based ultraviolet absorber represented by the general formula (I) is not particularly limited by its production method, and those produced by a well-known general method can be used. Examples of the production method include 2- [2-hydroxy-4- (2-hydroxyethyloxy) phenyl] -4,6-diphenyl-1,3,5-triazine as an alcohol component and a corresponding monovalent monomer. Examples thereof include a method by esterification reaction or transesterification reaction with an ester-derived compound of carboxylic acid (monovalent carboxylic acid, monovalent carboxylic acid halide or monovalent carboxylic acid ester), and these reactions may be sequential reactions, A batch reaction may be used.

  As a method of blending the triazine-based ultraviolet absorber represented by the general formula (I) into the polyethylene-based thermoplastic resin, a known technique for blending a stabilizer with a resin can be used without particular limitation. Any of a method of adding to a polymerization system in advance when polymerizing a thermoplastic resin, a method of adding during polymerization, and a method of adding after polymerization may be used. In addition, when added after polymerization, a method of kneading a stabilized polyethylene-based thermoplastic resin powder or pellet mixed with a Henschel mixer with an extruder or the like, or spraying a synthetic resin as a solution to impregnate Can be employed, the method used after making the masterbatch, etc., the type and processing temperature of the processing machine to be used, the cooling conditions after the processing are not particularly limited, and the obtained resin physical properties are suitable for the application It is preferable to select the following conditions. Further, the triazine-based ultraviolet absorber may be used alone or in the form of granules together with other additives.

  (B) The triazine-based ultraviolet absorber represented by the general formula (I) is 0.001 to 10 parts by mass, preferably 0.3 to 3 parts per 100 parts by mass of the (A) polyethylene-based thermoplastic resin. Part by mass is added. If the amount added is less than 0.001 part by mass, a sufficient weather resistance improving effect cannot be obtained. If the amount added is more than 10 parts by mass, the compatibility with the polyethylene-based thermoplastic resin deteriorates, and bleeding occurs over time. May be reduced.

  As the antifogging agent (C) contained in the agricultural film composition of the present invention, a fluorosurfactant; sorbitan monomyristate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monobehenate or alkylene oxides thereof Sorbitan surfactants such as adducts; glycerol monopalmitate, glycerol monostearate, glycerol dipalmitate, glycerol distearate, diglycerol monostearate, diglycerol distearate, diglycerol dipalmitate, diglycerol Glycerin-based surfactants such as monopalmitate monostearate, triglycerin monostearate, triglycerin distearate or adducts thereof with alkylene oxide; polyethylene glycol monostearate, Polyethylene glycol surfactants such as reethylene glycol monopalmitate; Trimethylolpropane surfactants such as trimethylolpropane monostearate; Pentaerythritol surfactants such as pentaerythritol monopalmitate; Alkylphenol monoalkylene oxide adducts An ester of a sorbitan / glycerin condensate with a fatty acid, an ester of a sorbitan / alkyl glycol condensate with a fatty acid; diglycerin dioleate sodium lauryl sulfate, sodium dodecylbenzenesulfonate, cetyltrimethylammonium chloride, dodecylamine hydrochloride, Lauric acid lauryl amide ethyl phosphate, triethyl cetyl ammonium iodide, oleylaminodiethylamine hydrochloride, dodecyl pyridium Examples thereof include dinium salts, and among these, fluorine surfactants are particularly preferable.

  Examples of the fluorine surfactant include (1) anionic fluorine-containing surfactant, (2) cationic fluorine-containing surfactant, (3) amphoteric fluorine-containing surfactant, and (4) nonionic fluorine-containing surfactant. Agents, (5) fluorine-containing oligomers, and the like. Specific examples of these are shown in [Chemical 11] to [Chemical 15] below.

However, in each formula in said (1)-(5), _Rf and _Rf 'represent the linear or branched fluoroalkyl group which substituted a part or all of the alkyl group by the fluorine atom, R' And R ″ represents a hydrogen atom or a lower alkyl group, B represents —CO— or —SO ₂ —, Y and Y ′ represent a direct bond or an alkylene group, A represents an ethylene group or a propylene group, M represents a hydrogen atom, —NH ₄ , an alkali metal or an alkaline earth metal, X represents a halogen atom, Z represents a direct bond, —N (R ″) SO ₂ — or —NHCO—, and n represents 1-50 is represented, p represents 1-3.

  Examples of the monomer (copolymerization component) that can form a copolymer with the polyfluoroalkyl group-containing (meth) acrylate in the (5) fluorine-containing oligomer include ethylene, vinyl acetate, vinyl chloride, vinyl fluoride, Vinylidene halide, styrene, α-methylstyrene, p-methylstyrene, (meth) acrylic acid and its alkyl ester, poly (oxyalkylene) (meth) acrylate, (meth) acrylimide, diacetone acrylamide, methylolated diacetone Acrylamide, N-methylolacrylamide, vinyl alkyl ether, halogenated alkyl vinyl ether, vinyl alkyl ketone, butadiene, isoprene, chloroprene, glycidyl acrylate, benzyl (meth) acrylate, cyclohexyl acrylate, Water maleic acid, aziridinyl (meth) acrylate, N- vinyl carbazole, and the like.

  The copolymerization ratio of these copolymer components to the polyfluoroalkyl group-containing (meth) acrylate is usually 1 to 70% by mass, preferably 10 to 50% by mass.

  The amount of the (C) antifogging agent used is 0.001 to 10 parts by mass, preferably 0.01 to 5 parts by mass with respect to 100 parts by mass of the (A) polyethylene-based thermoplastic resin. When the amount of the antifogging agent used is less than 0.001 part by mass, the antifogging effect is hardly exhibited, and the effect is saturated even when the amount exceeds 10 parts by mass.

  In the agricultural vinyl composition of the present invention, if necessary, a phosphorus-based, phenol-based or sulfur-based antioxidant usually used in agricultural films, a triazine-based ultraviolet absorber represented by the above general formula (I) UV absorbers other than additives, hindered amine light stabilizers (HALS), nucleating agents, lubricants, fillers, flame retardants, flame retardant aids, hydrotalcites, plasticizers, fibrous fillers, adhesion promoters , Physical property modifier, storage stability improver, metal soap, β-diketone, perchlorate, epoxy compound, pigment, dye, dehydrating agent, foaming agent, antibacterial agent, antifungal agent, antiseptic agent, antifouling agent, Antirust agent, antifoggant, dripproof agent, infrared absorber, surfactant, compatibilizer, antisettling agent, polymerization inhibitor, thickener, antifoaming agent, coupling agent, leveling agent, desiccant, Various additives such as sagging inhibitors and curing catalysts can be used in combination as appropriate. . The amount of these additives to be used can be appropriately selected according to the type of the additive and the like, but (A) 100 parts by mass of the polyethylene-based thermoplastic resin, preferably 10 parts by mass in total of all additives. The following.

  Examples of the phosphorus antioxidant include triphenyl phosphite, tris (2,4-ditert-butylphenyl) phosphite, tris (2,5-ditert-butylphenyl) phosphite, and tris (nonylphenyl). ) Phosphite, tris (dinonylphenyl) phosphite, tris (mono- and di-mixed nonylphenyl) phosphite, diphenyl acid phosphite, 2,2'-methylenebis (4,6-ditert-butylphenyl) octyl phosphite , Diphenyldecyl phosphite, diphenyloctyl phosphite, di (nonylphenyl) pentaerythritol diphosphite, phenyl diisodecyl phosphite, tributyl phosphite, tris (2-ethylhexyl) phosphite, tridecyl phosphite, trilauryl phosphite , Dibutyl acid phosphite, dilauryl acid phosphite, trilauryl trithiophosphite, bis (neopentylglycol) 1,4-cyclohexanedimethyldiphosphite, bis (2,4-ditert-butylphenyl) pentaerythritol Diphosphite, bis (2,5-ditert-butylphenyl) pentaerythritol diphosphite, bis (2,6-ditert-butyl-4-methylphenyl) pentaerythritol diphosphite, bis (2,4- Dicumylphenyl) pentaerythritol diphosphite, distearyl pentaerythritol diphosphite, tetra (C12-15 mixed alkyl) -4,4'-isopropylidene diphenyl phosphite, bis [2,2'-methylenebis (4,6 -Diamilphenyl)], isop Ropyridene diphenyl phosphite, tetratridecyl 4,4'-butylidenebis (2-tert-butyl-5-methylphenol) diphosphite, hexa (tridecyl) 1,1,3-tris (2-methyl-5-tert Tributyl-4-hydroxyphenyl) butane triphosphite, tetrakis (2,4-ditert-butylphenyl) biphenylene diphosphonite, tris (2-[(2,4,7,9-tetrakis tert-butyldibenzo [ d, f] [1,3,2] dioxaphosphin-6-yl) oxy] ethyl) amine, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 2 -Butyl-2-ethylpropanediol, 2,4,6-tritert-butylphenol monophosphite and the like.

  Examples of the phenol-based antioxidant include 2,6-ditert-butyl-p-cresol, 2,6-diphenyl-4-octadecyloxyphenol, stearyl (3,5-ditert-butyl-4- Hydroxyphenyl) propionate, distearyl (3,5-ditert-butyl-4-hydroxybenzyl) phosphonate, tridecyl 3,5-ditert-butyl-4-hydroxybenzylthioacetate, thiodiethylenebis [(3,5 -Di-tert-butyl-4-hydroxyphenyl) propionate], 4,4'-thiobis (6-tert-butyl-m-cresol), 2-octylthio-4,6-di (3,5-di-tert-butyl) -4-hydroxyphenoxy) -s-triazine, 2,2'-methylenebis (4-methyl-6-tert-butylphenol), bis [3,3- Bis (4-hydroxy-3-tert-butylphenyl) butyric acid] glycol ester, 4,4′-butylidenebis (2,6-ditert-butylphenol), 4,4′-butylidenebis (6-tert-butyl- 3-methylphenol), 2,2′-ethylidenebis (4,6-ditert-butylphenol), 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, bis [2-tert-butyl-4-methyl-6- (2-hydroxy-3-tert-butyl-5-methylbenzyl) phenyl] terephthalate, 1,3,5-tris (2,6-dimethyl-3-hydroxy -4-tert-butylbenzyl) isocyanurate, 1,3,5-tris (3,5-ditert-butyl-4-hydroxybenzyl) isocyanurate, 1,3,5-tris ( 3,5-ditert-butyl-4-hydroxybenzyl) -2,4,6-trimethylbenzene, 1,3,5-tris [(3,5-ditert-butyl-4-hydroxyphenyl) propionyloxyethyl ] Isocyanurate, tetrakis [methylene-3- (3 ′, 5′-ditert-butyl-4′-hydroxyphenyl) propionate] methane, 2-tert-butyl-4-methyl-6- (2-acroyloxy) -3-tert-butyl-5-methylbenzyl) phenol, 3,9-bis [2- (3-tert-butyl-4-hydroxy-5-methylhydrocinnamoyloxy) -1,1-dimethylethyl]- 2,4,8,10-tetraoxaspiro [5.5] undecane, triethylene glycol bis [β- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate Etc. The.

  Examples of the sulfur-based antioxidant include dialkylthiodipropionates such as dilauryl, dimyristyl, myristylstearyl, and distearyl esters of thiodipropionic acid, and pentaerythritol tetra (β-dodecyl mercaptopropionate). Examples include β-alkyl mercaptopropionic esters of polyols.

Examples of the ultraviolet absorber other than the triazine-based ultraviolet absorber represented by the general formula (I) include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, and 2-hydroxy-4-octoxybenzophenone. 2-hydroxybenzophenones such as 5,5′-methylenebis (2-hydroxy-4-methoxybenzophenone); 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (2-hydroxy-5-second) Trioctylphenyl) benzotriazole, 2- (2-hydroxy-3,5-ditert-butylphenyl) -5-chlorobenzotriazole, 2- (2-hydroxy-3-tert-butyl-5-methylphenyl)- 5-chlorobenzotriazole, 2- (2-hydroxy-3,5-dicumylphenyl) Benzotriazole, 2,2′-methylenebis (4-tert-octyl-6-benzotriazolylphenol), polyethylene glycol ester of 2- (2-hydroxy-3-tert-butyl-5-carboxyphenyl) benzotriazole, 2- [2-hydroxy-3- (2-acryloyloxyethyl) -5-methylphenyl] benzotriazole, 2- [2-hydroxy-3- (2-methacryloyloxyethyl) -5-tert-butylphenyl] benzo Triazole, 2- [2-hydroxy-3- (2-methacryloyloxyethyl) -5-tert-octylphenyl] benzotriazole, 2- [2-hydroxy-3- (2-methacryloyloxyethyl) -5-third Butylphenyl] -5-chlorobenzotriazole, 2- [2-hydroxy-5 -(2-methacryloyloxyethyl) phenyl] benzotriazole, 2- [2-hydroxy-3-tert-butyl-5- (2-methacryloyloxyethyl) phenyl] benzotriazole, 2- [2-hydroxy-3-tertiary 3-amyl-5- (2-methacryloyloxyethyl) phenyl] benzotriazole, 2- [2-hydroxy-3-tert-butyl-5- (3-methacryloyloxypropyl) phenyl] -5-chlorobenzotriazole, 2- [2-hydroxy-4- (2-methacryloyloxymethyl) phenyl] benzotriazole, 2- [2-hydroxy-4- (3-methacryloyloxy-2-hydroxypropyl) phenyl] benzotriazole, 2- [2-hydroxy -4- (3-methacryloyloxypropyl) phenyl 2- (2-hydroxyphenyl) benzotriazoles such as benzotriazole; 2- (2-hydroxy-4-methoxyphenyl) -4,6-diphenyl-1,3,5-triazine, 2- (2-hydroxy- 4-hexyloxyphenyl) -4,6-diphenyl-1,3,5-triazine, 2- (2-hydroxy-4-octoxyphenyl) -4,6-bis (2,4-dimethylphenyl) -1 , 3,5-triazine, 2- [2-hydroxy-4- (3-C12-13mixed alkoxy-2-hydroxypropoxy) phenyl] -4,6-bis (2,4-dimethylphenyl) -1,3 , 5-triazine, 2- [2-hydroxy-4- (2-acryloyloxyethoxy) phenyl] -4,6-bis (4-methylphenyl) -1,3,5-triazi 2- (2,4-dihydroxy-3-allylphenyl) -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, 2,4,6-tris (2-hydroxy- 2- (2-hydroxyphenyl) -4,6-diaryl-1,3,5-triazines such as 3-methyl-4-hexyloxyphenyl) -1,3,5-triazine; phenyl salicylate, resorcinol monobenzoate 2,4-ditert-butylphenyl-3,5-ditert-butyl-4-hydroxybenzoate, octyl (3,5-ditert-butyl-4-hydroxy) benzoate, dodecyl (3,5-ditert Tributyl-4-hydroxy) benzoate, tetradecyl (3,5-ditert-butyl-4-hydroxy) benzoate, hexadecyl (3,5-ditert-butyl-4-hydride) Roxy) benzoates, octadecyl (3,5-ditert-butyl-4-hydroxy) benzoate, benzoates such as behenyl (3,5-ditert-butyl-4-hydroxy) benzoate; 2-ethyl-2′-ethoxy Substituted oxanilides such as oxanilide and 2-ethoxy-4′-dodecyloxanilide; ethyl-α-cyano-β, β-diphenylacrylate, methyl-2-cyano-3-methyl-3- (p-methoxy) Cyanoacrylates such as phenyl) acrylate; various metal salts or metal chelates, particularly nickel or chromium salts or chelates.
In addition, when using these ultraviolet absorbers other than the triazine type ultraviolet absorber represented with the said general formula (I), it is preferable that the usage-amount does not exceed 80 weight% in a total ultraviolet absorber.

  Examples of the hindered amine light stabilizer include 2,2,6,6-tetramethyl-4-piperidyl stearate, 1,2,2,6,6-pentamethyl-4-piperidyl stearate, 2,2, 6,6-tetramethyl-4-piperidylbenzoate, bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate Bis (1-octoxy-2,2,6,6-tetramethyl-4-piperidyl) sebacate, tetrakis (2,2,6,6-tetramethyl-4-piperidyl) -1,2,3,4 Butanetetracarboxylate, tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) -1,2,3,4-butanetetracarboxylate, bis (2,2 6,6-tetramethyl-4-piperidyl) bis (tridecyl) -1,2,3,4-butanetetracarboxylate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) bis (Tridecyl) -1,2,3,4-butanetetracarboxylate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) -2-butyl-2- (3,5-ditertiary Butyl-4-hydroxybenzyl) malonate, 1- (2-hydroxyethyl) -2,2,6,6-tetramethyl-4-piperidinol / diethyl succinate polycondensate, 1,6-bis (2,2, 6,6-tetramethyl-4-piperidylamino) hexane / dibromoethane polycondensate, 1,6-bis (2,2,6,6-tetramethyl-4-piperidylamino) hexane / 2,4-dichloro- -Morpholino-s-triazine polycondensate, 1,6-bis (2,2,6,6-tetramethyl-4-piperidylamino) hexane / 2,4-dichloro-6-tert-octylamino-s-triazine Polycondensate, 1,5,8,12-tetrakis [2,4-bis (N-butyl-N- (2,2,6,6-tetramethyl-4-piperidyl) amino) -s-triazine-6 -Yl] -1,5,8,12-tetraazadodecane, 1,5,8,12-tetrakis [2,4-bis (N-butyl-N- (1,2,2,6,6-pentamethyl) -4-piperidyl) amino) -s-triazin-6-yl] -1,5,8,12-tetraazadodecane, 1,6,11-tris [2,4-bis (N-butyl-N- ( 2,2,6,6-tetramethyl-4-piperidyl) amino-s-triazine -6-ylamino] undecane, 1,6,11-tris [2,4-bis (N-butyl-N- (1,2,2,6,6-pentamethyl-4-piperidyl) amino-s-triazine- 6-ylamino] undecane, 3,9-bis [1,1-dimethyl-2- [tris (2,2,6,6-tetramethyl-4-piperidyloxycarbonyloxy) butylcarbonyloxy] ethyl] -2, 4,8,10-tetraoxaspiro [5.5] undecane, 3,9-bis [1,1-dimethyl-2- [tris (1,2,2,6,6-pentamethyl-4-piperidyloxycarbonyl] Oxy) butylcarbonyloxy] ethyl] -2,4,8,10-tetraoxaspiro [5.5] undecane, compounds represented by the following [Chemical Formula 16], and the like.

  Examples of the nucleating agent include aromatic carboxylic acid metal salts such as aluminum pt-butylbenzoate and sodium benzoate; sodium bis (2,4-ditert-butylphenyl) phosphate, bis (2,4- Acidic phosphate metal salts such as ditertiarybutylphenyl) lithium phosphate and sodium-2,2′-methylenebis (4,6-ditertiarybutylphenyl) phosphate; dibenzylidene sorbitol, bis (methylbenzylidene) sorbitol, etc. And polyhydric alcohol derivatives thereof.

  Examples of the lubricants include fatty acid amides such as lauryl amide, myristyl amide, stearyl amide, and behenyl amide, metal soaps such as ethylene bisstearyl amide, polyethylene wax, calcium stearate, and magnesium stearate, magnesium distearyl phosphate, stearyl phosphide Examples include phosphate ester metal salts such as acid ester magnesium.

  Examples of the filler include inorganic substances such as talc, silica, calcium carbonate, glass fiber, potassium titanate, potassium borate, and the like. Is used by appropriately selecting the fiber diameter, fiber length and aspect ratio. Moreover, it is preferable to use what was surface-treated as needed for the filler.

  The film formed using the agricultural film composition of the present invention may be a single layer structure film or a multilayer structure film. In the case of a multilayer structure film, (A) 100 parts by mass of a polyethylene-based thermoplastic resin, (B) 0.001 to 10 parts by mass of a triazine-based ultraviolet absorber represented by the above general formula (I) and / or ( C) A multilayer agricultural film formed from an agricultural film composition to which 0.001 to 10 parts by mass of an antifogging agent is added, and (B) a triazine type represented by the above general formula (I) Each of the ultraviolet absorber and the (C) antifogging agent is an agricultural film containing at least one layer. In the case of a multilayer structure film, (B) the triazine-based ultraviolet absorber and (C) the antifogging agent are not necessarily contained in all layers from the economical viewpoint. May be contained in at least one layer, and (C) the antifogging agent may be contained in at least the outermost layer. Moreover, the additive to be added in combination may be blended in the same layer as the triazine-based ultraviolet absorber and / or the antifogging agent or in a different layer.

  The method for producing an agricultural film using the agricultural film composition of the present invention is not particularly limited, and is a known molding method such as a circular die, an extrusion molding method using a T-die, an inflation molding method, or a pressure molding. Processing, paste processing, calendar processing, roll processing, blow molding method, melt casting method, powder molding method and the like can be employed as they are. Moreover, you may add extending | stretching operation to a uniaxial or biaxial direction as needed.

  The film thickness of the film obtained using the agricultural film composition of the present invention is preferably 0.001 to 1 mm, more preferably 0.01 to 0.5 mm.

  EXAMPLES Hereinafter, although an Example etc. are given and this invention is demonstrated further in detail, this invention is not limited to these Examples etc.

[Examples 1-1 to 1-9 and Comparative Examples 1-1 to 1-7]
With the following formulation, pellets were prepared at 25 rpm at 200 ° C. using a single screw extruder. The obtained pellets were pressed at 180 ° C. to prepare a film having a thickness of 80 microns. The film was subjected to the following tests.
(Weather resistance test)
The obtained film was exposed to a sunshine weatherometer (manufactured by Suga Test Instruments Co., Ltd.) under a condition of repeating a cycle of 2 hours without rain and 18 minutes with rain at 63 ° C. At 200 hours, 400 hours and 600 hours after the start of exposure, the film was visually observed, and the state of occurrence of coloring, dirt and scratches was evaluated in 10 stages. The evaluation criterion is that 1 represents a state in which there is almost no difference from that before exposure, and a state in which deterioration has progressed as the value increases.
(Translucency test)
The light transmittance was measured according to JIS K 7105 for the film before the exposure in the weather resistance test and after 400 hours from the start of the exposure.
(Pesticide resistance test)
In a 1 m × 1 m × 1 m cardboard container, 2 g of sulfur was fumigated with a hot plate, the film obtained in the cardboard container was allowed to stand for 24 hours, the surface state of the film was observed, and the above weather resistance Evaluation in 10 stages similar to the test was performed.
(Fog-proof test)
A test film was placed on the inclined ceiling of the fog observation frame surrounded by wooden boards on all sides, placed on a water bath having a water bath of about 40 ° C. prepared in advance, and left at room temperature of 25 ° C. for 48 hours. Next, while keeping the water temperature at 40 ° C., the room temperature was lowered to 5 ° C., and after 1 hour, the presence or absence of generation of fog near the inner surface of the film (surface on the side facing the water tank) was visually observed.
Table 1 shows the results of these tests.

(Combination)
Low-density polyethylene resin (Nihon Unicar Co., Ltd .: PES-120) 100 parts by mass Methylenebisamide 0.2 parts by mass DHT-4A (Kyowa Chemical Co., Ltd., hydrotalcite compound) 0.2 parts by mass Ultraviolet absorber (table) 1) 0.1 part by mass ADK STAB LA-77 (Asahi Denka Kogyo Co., Ltd., HALS) 0.1 part by mass (however, Examples 1-2, 1-6, 1-7, Comparative Example 1-2) 1-6 only)
Antifogging agent (described in Table 1) 0.1 parts by mass

[Examples 2-1 to 2-9 and Comparative Examples 2-1 to 2-7]
A film was prepared and each test was performed in the same manner as in Example 1 except that the formulation in pellet preparation was as follows. The results are shown in Table 2.
(Combination)
Ethylene-vinyl acetate copolymer (NUC-3250) 100 parts by mass Stearic acid amide 0.2 parts by mass UV absorber (described in Table 2) 0.1 parts by mass ADK STAB LA-77 (Asahi Denka Kogyo Co., Ltd., HALS ) 0.1 part by mass (however, Examples 2-2, 2-4, 2-7, 2-9, Comparative Examples 2-2, 2-4, 2-6 only)
Antifogging agent (described in Table 2) 0.1 parts by mass

[Examples 3-1 to 3-4 and Comparative examples 3-1 to 3-3]
The following formulation 1 was kneaded using a Banbury mixer and then granulated with a granulator to obtain pellets. Similarly, pellets were obtained by the following formulation 2. A 0.1 mm-thick film was prepared using an inflation film molding machine using the pellets of Formula 1 as the intermediate layer and the pellets of Formula 2 as the both side layers. About the obtained film, each test was done similarly to Example 1. The results are shown in Table 3.
(Formulation 1)
Ethylene-vinyl acetate copolymer (NUC-3250) 100 parts by mass Stearamide 0.2 parts by mass DHT-4A (Kyowa Chemical Co., Ltd., hydrotalcite compound) 0.2 parts by mass Compound No. 1 0.1 part by mass ADK STAB LA-77 (manufactured by Asahi Denka Kogyo Co., Ltd., HALS) 0.1 part by mass (however, only Example 3-3 and Comparative Example 3-2)
(Formulation 2)
Ethylene-vinyl acetate copolymer (NUC-3250) 100 parts by mass Stearamide 0.2 parts by mass Compound No. 1 0.1 part by mass ADK STAB LA-77 (manufactured by Asahi Denka Kogyo Co., Ltd., HALS) 0.1 part by mass (however, only Example 3-3 and Comparative Example 3-2)
Antifogging agent (described in Table 3) 0.1 parts by mass

  As is clear from Tables 1 to 3, the agricultural film composition to which the specific ultraviolet absorber and the antifogging agent according to the present invention are added is not colored when made into a film, and an ultraviolet absorber as a comparative compound is added. The comparative agricultural film composition is superior in weather resistance, translucency, agricultural chemical resistance and fog resistance and is suitable for use in agricultural films.

Claims (3)

(A) 100 parts by mass of a polyethylene-based thermoplastic resin, (B) 0.001 to 10 parts by mass of a triazine-based ultraviolet absorber represented by the following general formula (I), and (C) 0.001 to 10 parts of an antifogging agent An agricultural film composition obtained by adding parts by mass.
  The agricultural film composition according to claim 1, wherein the antifogging agent (C) is a fluorine-based surfactant. (A) 100 parts by weight of polyethylene-based thermoplastic resin, (B) a lower following general formula (I) represented by the triazine-based UV absorber 0.001 to 10 mass parts and with / or (C) anti-fogging agent 0. a agricultural film multilayer formed from agricultural film composition obtained by adding 001 to 10 parts by weight, (B) under following general formula (I) triazine-based UV absorber and represented by (C ) An agricultural film in which each of the antifogging agents is contained in at least one layer.