JP4580273B2 - Agricultural vinyl chloride resin film - Google Patents

Description

  The present invention relates to an agricultural vinyl chloride resin film useful as a covering material for agricultural facilities such as agricultural houses and tunnels.

  Conventionally, vinyl chloride resin films have been widely used as covering materials for agricultural tunnels, agricultural houses, etc. because they are inexpensive, have good transparency, and have excellent heat retention and strength. However, the vinyl chloride resin film has the disadvantage that the properties of adhering to each other when the films overlap each other are larger than those of polyethylene films, etc., and when the expansion house is ventilated, the rolled-up film is not sticky. There are problems that it is difficult to work a lot, and problems that films tend to stick together when stored in a bundle (hereinafter collectively referred to as stickiness problem).

  In order to solve such a problem, for example, Japanese Patent Laid-Open No. 2003-55516 (Patent Document 1) describes a specific organic acidic phosphate metal salt as 0.01 to 100 parts by weight of vinyl chloride resin. An agricultural vinyl chloride resin film characterized by adding 0.5 to 5 parts by weight of a compound obtained by polymerizing a specific monomer and 0.1 to 5 parts by weight is disclosed. The addition of a homopolymer of glycidyl methacrylate having an average molecular weight of 8000 is described.

  Japanese Patent Laid-Open No. 2001-316490 (Patent Document 2) discloses a vinyl chloride resin film obtained by molding a vinyl chloride resin composition containing at least a plasticizer and a stabilizer. A vinyl chloride resin film characterized by adding 0.1 to 10 parts by weight of a homopolymer and / or copolymer of glycidyl acrylate and / or glycidyl methacrylate to 100 parts by weight of the resin is disclosed, In the specification, it is described that a homopolymer of glycidyl (meth) acrylate having a mass average molecular weight of 1,000 to 20,000 is added.

However, although the conventional vinyl chloride resin film for agriculture described in the above-mentioned patent documents has been improved with respect to the stickiness problem, it is still not sufficient in that it may induce blowout whitening (bleed). It was not something.
JP 2003-55516 A JP 2001-316490 A

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide an agricultural vinyl chloride resin film that has improved the problem of stickiness while sufficiently preventing the occurrence of bleeding. .

As a result of intensive studies to achieve the above object, the present inventor has found that a vinyl chloride resin film for agriculture obtained by molding a vinyl chloride resin composition has a large mass average molecular weight ( 28000 to 100,000 ) glycidyl. Agricultural vinyl chloride type which has improved the problem of stickiness while sufficiently preventing the occurrence of bleed by containing a predetermined amount of a (meth) acrylate homopolymer and an amide compound having a melting point of 100 ° C. or higher. The present inventors have found that a resin film can be obtained and have completed the present invention.

That is, the agricultural vinyl chloride resin film of the present invention is an agricultural vinyl chloride resin film obtained by molding a vinyl chloride resin composition, and the vinyl chloride resin composition is a vinyl chloride resin. 0.5 to 2 parts by mass of a homopolymer of glycidyl (meth) acrylate having a mass average molecular weight of 28000 to 100,000 and 0.1 to 0 of an amide compound having a melting point of 100 ° C. or more with respect to 100 parts by mass. It contains 7 parts by mass.

  Furthermore, in the agricultural vinyl chloride resin film of the present invention, the amide compound is preferably methylene bisstearyl amide.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the vinyl chloride resin film for agriculture which improved the problem of stickiness, fully preventing generation | occurrence | production of a bleed.

  Hereinafter, the agricultural vinyl chloride resin film of the present invention will be described in detail according to preferred embodiments thereof.

The agricultural vinyl chloride resin film of the present invention is an agricultural vinyl chloride resin film obtained by molding a vinyl chloride resin composition, and the vinyl chloride resin composition is 100 masses of vinyl chloride resin. 0.5 to 2 parts by mass of a glycidyl (meth) acrylate homopolymer having a mass average molecular weight of 28000 to 100,000 and 0.1 to 0.7 parts by mass of an amide compound having a melting point of 100 ° C. or higher. It is characterized by including a part.

  Examples of the vinyl chloride resin used in the present invention include polyvinyl chloride, which is a homopolymer of vinyl chloride, and vinyl chloride and other monomers (for example, ethylene, propylene, vinyl acetate, acrylic acid, methacrylic acid, acrylic acid). Ester, methacrylic acid ester, maleic acid, maleic acid ester, fumaric acid, itaconic acid, vinylidene chloride, acrylonitrile, higher vinyl ether, etc.) or a mixture of these resins.

  The homopolymer of glycidyl (meth) acrylate used in the present invention is a homopolymer of glycidyl acrylate and / or a homopolymer of glycidyl methacrylate. The homopolymer of glycidyl (meth) acrylate has a mass average molecular weight of 25000 or more, preferably 28000 to 100,000. When the mass average molecular weight of the glycidyl (meth) acrylate homopolymer is less than 25,000, bleeding occurs on the surface of the agricultural vinyl chloride resin film due to changes over time. On the other hand, when it exceeds 100,000, the polymerization cannot be performed uniformly and the variation in molecular weight tends to increase. Such a homopolymer of glycidyl (meth) acrylate is not particularly limited, but can be produced by a polymerization method such as solution polymerization or suspension polymerization. Furthermore, these glycidyl (meth) acrylate homopolymers can be used singly or in combination of two or more.

  Moreover, as content of the homopolymer of the said glycidyl (meth) acrylate, it is 0.5-2 mass parts with respect to 100 mass parts of said vinyl chloride resin, Preferably, it is 0.7-1.5 mass parts It is. If the content of the glycidyl (meth) acrylate homopolymer is less than 0.5 parts by mass, a problem of stickiness of the film occurs when the extension house is ventilated. On the other hand, even if it exceeds 2 parts by mass, the effect obtained is not changed, and the increase in the amount added increases the cost and there is no merit due to the increase.

  The amide compound used in the present invention has a melting point of 100 ° C. or higher, preferably 130 to 160 ° C. When the melting point of the amide compound is less than 100 ° C., a problem of stickiness of the film occurs when the extension house is ventilated. On the other hand, if the above upper limit is exceeded, there is a tendency that bleeds generated on the film surface increase. Examples of such amide compounds include methylene bisstearyl amide, ethylene bisstearyl amide, stearic acid amide, ethylene bisbehenic acid amide, and ethylene bisoleic acid amide. From the viewpoint of bleeding, methylene bisstearyl amide Ethylene bisstearyl amide is preferred, and methylene bisstearyl amide is particularly preferred. Moreover, these amide type compounds can be used individually by 1 type or in mixture of 2 or more types.

  Furthermore, as content of the said amide type compound, it is 0.1-0.7 mass part with respect to 100 mass parts of said vinyl chloride resin, Preferably, it is 0.2-0.5 mass part. When the content of the amide compound is less than 0.1 parts by mass, a problem of stickiness of the film occurs when the extension house is ventilated. On the other hand, if it exceeds 0.7 parts by mass, the bleed material generated on the surface of the film increases.

  In the vinyl chloride resin composition for obtaining the agricultural vinyl chloride resin film of the present invention, in addition to the vinyl chloride resin, the homopolymer of glycidyl (meth) acrylate and the amide compound, if necessary Various additives such as a plasticizer, a heat stabilizer, a light stabilizer, an antioxidant, an ultraviolet absorber, a lubricant, a filler, a drip-proof agent, and an antifoggant can be added.

  Examples of the plasticizer that can be added to the vinyl chloride resin composition according to the present invention include di-2-ethylhexyl phthalate (DOP), phthalic acid diisononyl ester (DINP), phthalic acid butyl benzyl ester (BBP), General phthalate plasticizers such as diisodecyl phthalate (DIDP) and diundecyl phthalate (DUP); adipic acid dioctyl ester (DOA), sebacic acid dioctyl ester (DOS), azelaic acid dioctyl ester General fatty acid ester plasticizer represented by (DOZ); Trimellitic acid ester plasticizer represented by trimellitic acid trioctyl ester (TOTM); Polyester plasticizer represented by polypropylene adipate, etc. Molecular plasticizer General plasticizers such as chlorinated paraffin; tricresyl phosphate (TCP), trixylyl phosphate (TXP), tris (isopropylphenyl) phosphate, tributyl phosphate, triethyl phosphate, triphenyl phosphate And phosphate ester plasticizers such as triethylphenyl phosphate; epoxidized products of vegetable oils; and epoxy resins. Examples of such epoxidized vegetable oils include epoxidized soybean oil and epoxidized linseed oil, and examples of such epoxy resins include epoxidized polybutadiene, epoxy methyl stearate, epoxy butyl stearate, and epoxy. Ethyl hexyl stearate, tris (epoxypropyl) isocyanurate, 3- (2-xenoxy) -1,2-epoxypropane, bisphenol A diglycidyl ether, vinyl dicyclohexene diepoxide, 2,2-bis (4-hydroxyphenyl) An epoxy plasticizer such as a polycondensate of propane and epichlorohydrin can be used. Moreover, these plasticizers can be used individually by 1 type or in mixture of 2 or more types. Furthermore, the addition amount of these plasticizers can be suitably determined according to the use of the agricultural film and the type of plasticizer.

  Examples of heat stabilizers that can be added to the vinyl chloride resin composition according to the present invention include commonly used heat stabilizers such as metal soaps, organic phosphite stabilizers, and β-diketone compounds. Can do. Examples of such metal soaps include zinc stearate, barium stearate, calcium stearate, barium ricinoleate, calcium laurate, calcium oleate, and zinc octoate. Examples of such organic phosphite stabilizers include diphenyldecyl phosphite, triphenyl phosphite, tris (nonylphenyl) phosphite, tridecyl phosphite, tris (2-ethylhexyl) phosphite, tri Examples include stearyl phosphite and octyl diphenyl phosphite. Furthermore, examples of such a β-diketone compound include dibenzoylmethane and stearylbenzoylmethane. Moreover, these stabilizers can be used individually by 1 type or in mixture of 2 or more types. Furthermore, as addition amount of these stabilizers, 0.5-10 mass parts is preferable with respect to 100 mass parts of said vinyl chloride resin, and 1-5 mass parts is more preferable.

  Examples of the light stabilizer that can be added to the vinyl chloride resin composition according to the present invention 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, N- (2,2,6,6-tetramethyl-4-piperidyl) dodecyl succinimide, 1- [(3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxyethyl] -2,2,6,6-tetramethyl-4-piperidyl (3,5-di-tert-butyl-4-hydroxy Phenyl) propionate, bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) se Kate, bis (1,2,2,6,6, -pentamethyl-4-piperidyl) -2-butyl-2- (3,5-di-tert-butyl-4-hydroxybenzyl) malonate, N, N ′ -Bis (2,2,6,6-tetramethyl-4-piperidyl) hexamethylenediamine, tetra (2,2,6,6-tetramethyl-4-piperidyl) butanetetracarboxylate, bis (2,2, 6,6-tetramethyl-4-piperidyl) di (tridecyl) butanetetracarboxylate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) di (tridecyl) butanetetracarboxylate, 3,9 -Bis {1,1-dimethyl-2- [tris (2,2,6,6-tetramethyl-4-piperidyloxycarbonyloxy) butylcarbonyloxy] ethyl } -2,4,8,10-tetraoxysaspiro [5,5] undecane, 3,9-bis {1,1-dimethyl-2- [tris (1,2,2,6,6-pentamethyl- 4-piperidyloxycarbonyloxy) butylcarbonyloxy] ethyl} -2,4,8,10-tetraoxaspiro [5,5] undecane, 1,5,8,12-tetrakis {4,6-bis [N- (2,2,6,6-tetramethyl-4-biperidyl) butylamino] -1,3,5-triazin-2-yl} -1,5,8,12-tetraazadodecane, 1- (2- Hydroxyethyl) -2,2,6,6-tetramethyl-4-piperidinol / dimethyl succinate condensate, 2-tert-octylamino-4,6-dichloro-s-triazine / N, N′-bis (2 , 2,6,6-tetra Hindered amine light stabilizers such as methyl-4-piperidyl) hexamethylenediamine condensate, N, N′-bis (2,2,6,6-tetramethyl-4-piperidyl) hexamethylenediamine / dibromoethane condensate Can be mentioned. Moreover, as these hindered amine light stabilizers, those having a mass average molecular weight of about 800 to 2000 are preferred. Furthermore, the addition amount of these light stabilizers is preferably 0.01 to 0.3 parts by mass with respect to 100 parts by mass of the vinyl chloride resin.

  Examples of the antioxidant that can be added to the vinyl chloride resin composition according to the present invention include alkylphenol, alkylene bisphenol, alkylphenol thioether, β, β′-thiopropionic acid ester, organic phosphite ester, aromatic Examples include amines and phenol / nickel composites. Moreover, these antioxidants can be used individually by 1 type or in mixture of 2 or more types.

  Examples of ultraviolet absorbers that can be added to the vinyl chloride resin composition according to the present invention include salicylic acid esters, benzotriazoles, hydroxybenzophenones, and acrylonitrile substitutes. Specifically, 2,4-dihydroxy 2-, such as benzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-ethoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 5,5′-methylenebis (2-hydroxy-4-methoxybenzophenone) Hydroxybenzophenones; 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-tert-butylphenyl) -5-chlorobenzotriazole, 2 -(2'-hydroxy-3 ' tert-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-5'-tert-octylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'- 2- (2′-hydroxyphenyl) benzotriazoles such as dicumylphenyl) benzotriazole, 2,2′-methylenebis (4-tert-octyl-6-benzotriazole) phenol; phenyl salicylate, resorcinol monobenzoate, Benzoates such as 2,4-di-tert-butylphenyl-3 ′, 5′-di-tert-butyl-4′-hydroxybenzoate, hexadecyl-3,5-di-tert-butyl-4-hydroxybenzoate; Oxanilides such as 2-ethoxy-4'-dodecyloxanilide S; ethyl -α- cyano-beta, beta .'- diphenylacrylate include cyanoacrylates such as methyl-2-cyano-3-methyl-3- (p-methoxyphenyl) acrylate. Moreover, these ultraviolet absorbers can be used individually by 1 type or in mixture of 2 or more types.

  Examples of the lubricant that can be added to the vinyl chloride resin composition according to the present invention include metal soaps such as zinc stearate, barium stearate, and calcium stearate; liquid paraffin, polyethylene waxes, chlorinated hydrocarbons, and the like. Hydrocarbons; fatty acid esters such as butyl stearate, cetyl palmitate and monoglyceride stearate; fatty acid lubricants such as stearic acid, isostearic acid and palmitic acid; metal phosphates such as barium isodecyl phosphate and calcium octadecyl phosphate System lubricants. Moreover, these lubricants can be used combining the said amide type compound and 1 type, or 2 or more types.

  Examples of the filler that can be added to the vinyl chloride resin composition according to the present invention include magnesium carbonate, magnesium hydroxide, magnesium silicate, silicon oxide, calcium carbonate, titanium oxide, aluminum hydroxide, aluminum oxide, and talc. Inorganic fillers such as: organic fillers such as acrylic particles made of a polymer mainly composed of alkyl methacrylate. Moreover, these fillers can be used individually by 1 type or in mixture of 2 or more types. Further, these fillers preferably have an average particle size of 0.5 to 10 μm.

  Examples of the drip-proofing agent that can be added to the vinyl chloride resin composition according to the present invention include, for example, sorbitan fatty acid ester, sorbitol fatty acid ester, glycerin fatty acid ester, diglycerin fatty acid ester, triglycerin fatty acid ester, and tetraglycerin fatty acid ester. Polyglycerin fatty acid esters such as: sorbitan fatty acid / dibasic acid ester, sorbitol fatty acid / dibasic acid ester, diglycerin fatty acid / dibasic acid ester, etc., polyhydric alcohol and fatty acid ester, polyhydric alcohol and fatty acid and dibasic Esters with acids; or compounds in which alkylene oxides such as ethylene oxide, propylene oxide, and butylene oxide are added to these, specifically, sorbitan palmitate, sorbitan stearate Sorbitan stearate / ethylene oxide 2 mol adduct, sorbitan stearate / propylene oxide 3 mol adduct, sorbitol stearate, sorbitol stearate / ethylene oxide 3 mol adduct, diglycerin palmitate / ethylene oxide 2 mol adduct, Examples thereof include sorbitan stearate adipate / ethylene oxide 2 mol adduct, diglycerin palmitate sebacate / propylene oxide 3 mol adduct, sorbitol palmitate adipate / ethylene oxide 3 mol adduct, and the like. Moreover, these drip-proofing agents can be used individually by 1 type or in combination of 2 or more types. Furthermore, the addition amount of these drip-proofing agents is preferably 0.5 to 6 parts by mass with respect to 100 parts by mass of the vinyl chloride resin.

The anti-fogging agent that can be added to the vinyl chloride resin composition according to the present invention includes a fluorine-containing group having at least one selected from the group consisting of a fluorine-containing group and a hydroxyl group and an alkylene oxide group in one molecule. Compounds. Examples of such a fluorine-containing group include a perfluoroalkyl group [C _n F _{2n + 1} group], a perfluoroalkoxyl group [C _n F _{2n + 1} O group], and a polyfluoroalkyl group [H _m C _n F _{2n + 1-m} group], perfluoroalkenyl group [C _n F _2n-1 group], polyfluoroalkenyl group [H _m C _n F _2n-1-m group] (where m in the formula is 1-3, n represents an integer of 3-20). Examples of such an alkylene oxide group include (C ₂ H ₄ O) n and (C ₃ H ₆ O) n (provided that the formula N represents an integer of 1 to 30).

As such a fluorine-containing compound, for example, the following formulas (1) to (32):
(1) CF ₃ (CF ₂ ) ₄ OCOC (CH ₃ ) = CH ₂
(2) CF ₃ (CF ₂ ) ₆ (CH ₂ ) ₂ OCOC (CH ₃ ) = CH ₂
(3) CF ₃ (CF ₂ ) ₆ COOCH = CH ₂
(4) CF ₃ (CF ₂ ) ₇ (CH ₂ ) ₂ OCOCH = CH ₂
(5) CF ₃ CF (CF ₃ ) (CF ₂ ) ₅ (CH ₂ ) ₂ OCOCH = CH ₂
(6) CF ₃ (CF ₂ ) ₇ SO ₂ N (C ₃ H ₇ ) (CH ₂ ) ₂ OCOCH = CH ₂
(7) CF ₃ (CF ₂ ) ₇ (CH ₂ ) ₄ OCOCH = CH ₂
(8) CF ₃ (CF ₂ ) ₇ SO ₂ N (CH ₃ ) (CH ₂ ) ₂ OCOC (CH ₃ ) = CH ₂
(9) CF ₃ (CF ₂ ) ₇ SO ₂ N (C ₂ H ₅ ) (CH ₂ ) ₂ OCOCH = CH ₂
(10) CF ₃ (CF ₂ ) ₇ CONH (CH ₂ ) ₂ OCOCH = CH ₂
(11) CF ₃ CF (CF ₃ ) (CF ₂ ) ₆ (CH ₂ ) ₃ OCOCH = CH ₂
(12) CF ₃ CF (CF ₃ ) (CF ₂ ) ₆ CH ₂ CH (OCOCH ₃ ) OCOC (CH ₃ ) = CH ₂
(13) CF ₃ CF (CF ₃ ) (CF ₂ ) ₆ CH ₂ CH (OH) CH ₂ OCOCH = CH ₂
(14) CF ₃ (CF ₂ ) ₆ (CH ₂ ) ₂ OCOCH = CH ₂
(15) CF ₃ (CF ₂ ) ₆ (CH ₂ ) ₂ OCOC (CH ₃ ) = CH ₂
(16) CF ₃ (CF ₂ ) ₆ CONH (CH ₂ ) ₂ OCOC (CH ₃ ) = CH ₂
(17) CF ₃ CF (CF ₂ Cl) (CF ₂ ) ₆ CONHCONH = CH ₂
(18) H (CF ₂ ) ₁₀ CH ₂ OCOCH = CH ₂
(19) CF ₂ Cl (CF ₂ ) ₁₀ CH ₂ OCOC (CH ₃ ) = CH ₂
(20) CF ₃ CF (CF ₃ ) (CF ₂ ) ₅ (CH ₂ ) ₂ O (C ₂ H ₄ O) ₈ CH ₃
(21) CF ₃ CF (CF ₃ ) (CF ₂ ) ₅ (CH ₂ ) ₂ (OH) CH ₂ O (C ₂ H ₄ O) ₁₀ CH ₃
(22) CF ₃ CF (CF ₃ ) (CF ₂ ) ₇ CH ₂ CH (OCH ₃ ) CH ₂ O (C ₂ H ₄ O) ₁₀ CH ₃
(23) CF ₃ CF (CF ₃ ) (CF ₂ ) ₇ CH ₂ CH (OH) CH ₂ O (C ₃ H ₆ O) ₁₀ H
(24) CF ₃ CF (CF ₃ ) (CF ₂ ) ₅ CH ₂ CH (OCOCH ₃ ) CH ₂ O (C ₃ H ₆ O) ₈ CH ₃
(25) CF ₃ CF (CF ₃ ) (CF ₂ ) ₅ SO ₂ N (C ₂ H ₅ ) (C ₂ H ₄ O) ₁₂ H
(26) CF ₃ CF (CF ₃ ) (CF ₂ ) ₃ CON (C ₂ H ₅ ) (C ₂ H ₄ O) ₈ H
(27) CF ₃ (CF ₂ ) ₇ (CH ₂ ) ₂ (OH) CH ₂ O (C ₂ H ₄ O) ₁₀ CH ₃
(28) CF ₃ (CF ₂ ) ₉ CH ₂ CH (OCH ₃ ) CH ₂ O (C ₂ H ₄ O) ₁₀ CH ₃
(29) CF ₃ (CF ₂ ) ₉ CH ₂ CH (OH) CH ₂ O (C ₃ H ₆ O) ₁₀ H
(30) CF ₃ (CF ₂ ) ₇ CH ₂ CH (OCOCH ₃ ) CH ₂ O (C ₃ H ₆ O) ₈ CH ₃
(31) CF ₃ (CF ₂ ) ₇ SO ₂ N (C ₂ H ₅ ) (C ₂ H ₄ O) ₁₂ H
(32) CF ₃ (CF ₂ ) ₅ CON (C ₂ H ₅ ) (C ₂ H ₄ O) ₈ H
The compound shown by these is mentioned. Moreover, as addition amount of these fluorine-containing compounds, 0.01-1 mass part is preferable with respect to 100 mass parts of said vinyl chloride resin, and 0.05-0.5 mass part is more preferable.

  The production method of the vinyl chloride resin composition according to the present invention is not particularly limited. For example, the vinyl chloride resin, the homopolymer of the glycidyl (meth) acrylate and the amide compound, and optionally a plasticizer, It is obtained by blending various additives such as a heat stabilizer and a light stabilizer and mixing them uniformly. In the present invention, the method of uniformly mixing the vinyl chloride resin composition is not particularly limited, and examples thereof include a method of uniformly mixing using a Henschel mixer.

  The agricultural vinyl chloride resin film of the present invention can be obtained by forming the vinyl chloride resin composition into a film having a desired thickness by an appropriate means such as a calendering method, an extrusion method, or an inflation method. The thickness of the film varies depending on the application and cannot be determined unconditionally, but is preferably about 0.05 to 0.2 mm.

  In addition, the agricultural vinyl chloride resin film of the present invention may be formed by forming a coating film with a solvent-type, water-type, or UV-curable coating on one or both sides. Examples of such solvent type paints include solvent type paints such as acrylic resin, vinyl chloride-acrylic resin, cellulose resin, fluororesin, polyamide resin, urethane resin, epoxy resin, and silicone resin. Is mentioned. Examples of such water-based paints include water-based paints such as acrylic resin, polyester resin, urethane resin, and epoxy resin. Furthermore, examples of such ultraviolet curable coating materials include acrylic resin-based, acrylic-modified urethane resin-based, acrylic-modified epoxy resin-based, mercapto derivative-based, and epoxy resin-based ultraviolet curable coating materials.

  Furthermore, in the agricultural vinyl chloride resin film of the present invention, when spread on a house, the above-mentioned paint is applied to the surface located outside the house, and a dust-proof treatment can be performed by forming a coating film. it can. On the other hand, the surface located inside the house can be treated to impart drip-proof properties by applying a paint obtained by adding colloidal silica or the like to the aforementioned paint and forming a coating film.

  EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example and a comparative example, this invention is not limited to a following example. In addition, the stickiness and bleeding property of the vinyl chloride resin film for agriculture were evaluated by the following methods, respectively.

(I) Stickiness of agricultural vinyl chloride resin film First, a 5 m long tunnel house (frontage 1.5 m) is made outdoors using an agricultural vinyl chloride resin film, and the tunnel house is sealed for 7 days. I left it alone. Next, the surfaces of the agricultural vinyl chloride resin film that have been left standing are crimped together (pressed three times with a manual rubber roller and drained), dried at 70 ° C. for 2 hours, and then cut to a width of 3 cm. A sample was obtained. Subsequently, the average load at the time of peeling off the obtained sample was measured using a universal tensile tester (manufactured by Toyo Seiki Co., Ltd.). In addition, the case where the average load at the time of peeling a sample is 50 g or less was evaluated as a pass ((circle)), and the case where it exceeded 50 g was evaluated as a disqualification (x).

(Ii) Bleedability of agricultural vinyl chloride resin film First, an agricultural vinyl chloride resin film was heat-treated at 50 ° C. for 5 hours and allowed to stand in a 20 ° C. atmosphere for 1 month. Then, the surface condition of the agricultural vinyl chloride resin film after standing was visually confirmed and evaluated. Evaluation was made according to the following criteria.
A: There is no bleed material.
○: Slight bleeding but no problem.
□: Bleed can be clearly confirmed.
Δ: There are many bleeds.
X: There are a lot of bleeds.

Example 1
First, 100 parts by mass of a polyvinyl chloride resin (average polymerization degree: 1400), 48 parts by mass of di-2-ethylhexyl phthalate, 3 parts by mass of trixylenyl phosphate, 1 part by mass of a liquid Ba-Zn composite thermal stabilizer, powdery form 1 part by mass of Ba-Zn composite heat stabilizer, benzophenone UV absorber (Viosorb)
130: manufactured by Kyodo Yakuhin Co., Ltd.) 0.1 parts by mass, sorbitan stearate 2 parts by mass, methylene bisstearyl amide (melting point: 147 ° C.) 0.2 parts by mass, fluorine-based antifoggant (DS-401: manufactured by Daikin Industries, Ltd.) ) 0.1 part by mass, 0.1 part by mass of hindered amine light stabilizer (LA-63: manufactured by Asahi Denka Kogyo Co., Ltd.) and 1 part by mass of glycidyl methacrylate homopolymer 1 (average mass molecular weight: 30000) The mixture was stirred and mixed for 10 minutes using a Henschel mixer (manufactured by Mitsui Mining Co., Ltd.) to obtain a vinyl chloride resin composition. Next, the obtained vinyl chloride resin composition was heated and melted to 175 ° C. and kneaded in rolls, and then formed into a film having a thickness of 0.1 mm by a calender device to produce an agricultural vinyl chloride resin film. Obtained.

(Example 2)
An agricultural vinyl chloride resin film was obtained in the same manner as in Example 1 except that 1 part by mass of glycidyl methacrylate homopolymer 2 (average mass molecular weight: 50000) was blended in place of glycidyl methacrylate homopolymer 1.

(Example 3)
An agricultural vinyl chloride resin film was obtained in the same manner as in Example 1 except that 1 part by mass of glycidyl methacrylate homopolymer 3 (average mass molecular weight: 90000) was blended in place of glycidyl methacrylate homopolymer 1.

Example 4
An agricultural vinyl chloride resin film was obtained in the same manner as in Example 1 except that 1 part by mass of glycidyl methacrylate homopolymer 4 (average mass molecular weight: 100,000) was blended in place of glycidyl methacrylate homopolymer 1.

(Comparative Example 1)
An agricultural vinyl chloride resin film was obtained in the same manner as in Example 1 except that 1 part by mass of glycidyl methacrylate homopolymer 5 (average mass molecular weight: 8000) was blended in place of glycidyl methacrylate homopolymer 1.

(Comparative Example 2)
An agricultural vinyl chloride resin film was obtained in the same manner as in Example 1 except that 1 part by mass of glycidyl methacrylate homopolymer 6 (average mass molecular weight: 15000) was blended in place of glycidyl methacrylate homopolymer 1.

(Comparative Example 3)
An agricultural vinyl chloride resin film was obtained in the same manner as in Example 1 except that 1 part by mass of glycidyl methacrylate homopolymer 7 (average mass molecular weight: 20000) was blended in place of glycidyl methacrylate homopolymer 1.

(Comparative Example 4)
A vinyl chloride resin film for agriculture was obtained in the same manner as in Example 1 except that 2 parts by mass of epoxidized soybean oil (W-100EL: manufactured by Dainippon Ink Industries, Ltd.) was blended in place of glycidyl methacrylate homopolymer 1.

(Comparative Example 5)
An agricultural vinyl chloride resin film was obtained in the same manner as in Example 1 except that 2 parts by mass of bisphenol A diglycidyl ether (Epicoat 828: manufactured by Yuka Shell Epoxy Co., Ltd.) was blended in place of glycidyl methacrylate homopolymer 1.

(Comparative Example 6)
An agricultural vinyl chloride resin film was obtained in the same manner as in Example 2 except that 0.2 parts by mass of erucic acid amide (melting point: 82 ° C.) was blended in place of methylene bisstearyl amide.

  About each vinyl chloride resin film for agriculture obtained in Examples 1 to 4 and Comparative Examples 1 to 6, the stickiness and bleeding property were evaluated. The obtained results are shown in Table 1.

  As is clear from the results shown in Table 1, the agricultural vinyl chloride resin films (Examples 1 to 4) of the present invention have improved stickiness while sufficiently preventing the occurrence of bleeding. It was confirmed.

  As described above, according to the present invention, it is possible to provide an agricultural vinyl chloride resin film that has improved the problem of stickiness while sufficiently preventing the occurrence of bleeding.

  Therefore, the agricultural vinyl chloride resin film of the present invention is very useful as a covering material for agricultural facilities such as agricultural houses and tunnels.

Claims (2)

An agricultural vinyl chloride resin film obtained by molding a vinyl chloride resin composition, wherein the vinyl chloride resin composition has a mass average molecular weight of 28000 to 100,000 per 100 parts by mass of the vinyl chloride resin. Agricultural chloride characterized by containing 0.5 to 2 parts by mass of a glycidyl (meth) acrylate homopolymer and 0.1 to 0.7 parts by mass of an amide compound having a melting point of 100 ° C. or higher. Vinyl resin film. The agricultural vinyl chloride resin film according to claim 1, wherein the amide compound is methylene bisstearyl amide.