JP3240933B2 - Agricultural vinyl chloride resin film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vinyl chloride resin film for agricultural use. More specifically, the present invention relates to a vinyl chloride resin film for agricultural use having good durability, which is a composite of a vinyl chloride resin fiber and / or a vinylidene chloride resin fiber.

[0002]

2. Description of the Related Art In recent years, in order to efficiently cultivate useful plants, promotion cultivation in a house or a tunnel has been actively performed. As a material for covering the house or the tunnel, a vinyl chloride resin film is frequently used because of its excellent weather resistance, transparency, heat retention and the like.

However, vinyl chloride resin films are
At high winds or at low temperatures, the film becomes hard and breaks easily. In order to prevent the breakage, an agricultural reinforcing vinyl chloride-based resin laminated film (Japanese Patent Application Laid-Open No. Hei 8 (1996)), in which a reinforcing thread composed of multifilaments of a vinyl chloride-based or vinylidene chloride-based resin bundled with a binder of a resin emulsion is interposed.
-169089) has been proposed. However, although these films are effective in preventing tearing, exposure to a coating material for a long time outdoors causes a change in the appearance of the film, and there is a problem in long-term use.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vinyl chloride resin film for agricultural use which is excellent in durability without being deteriorated in physical properties or change in appearance even when extended for a long period of time. .

[0005]

Means for Solving the Problems The inventors of the present invention provide a vinyl chloride resin fiber and / or a vinylidene chloride resin fiber with a surface treatment comprising a specific substance, and apply an acrylic resin film to the surface of the vinyl chloride resin film. The above-mentioned problem has been solved by providing a resin film. The gist of the present invention is that a group of yarns composed of vinyl chloride resin fibers and / or vinylidene chloride resin fibers surface-treated with silicone oil is sandwiched between two vinyl chloride resin films. The present invention relates to an agricultural vinyl chloride resin film in which an acrylic resin film is formed on one or both surfaces of the resulting vinyl chloride resin film.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
In the present invention, the vinyl chloride resin is vinyl chloride or a mixture of vinyl chloride and a comonomer copolymerizable therewith by a conventional method such as a suspension polymerization method, a bulk polymerization method, a fine suspension polymerization method or an emulsion polymerization method. It is meant to include all products manufactured. Examples of the comonomer include vinyl esters such as vinyl acetate, vinyl propionate and vinyl laurate; acrylates such as methyl acrylate, ethyl acrylate and butyl acrylate; methacrylates such as methyl methacrylate and ethyl methacrylate; and dibutyl. Maleates such as maleate and diethyl maleate; fumaric esters such as dibutyl fumarate and diethyl fumarate; vinyl ethers such as vinyl methyl ether, vinyl butyl ether and vinyl octyl ether; cyanides such as acrylonitrile and methacrylonitrile Α-olefins such as vinyl chloride, ethylene, propylene and styrene, vinylidene chloride and vinyl halide other than vinyl chloride such as vinylidene chloride and vinyl bromide Diallyl phthalate, polyfunctional monomers such as ethylene glycol dimethacrylate and the like, of course, the comonomer is not limited to those described above. The polymerization degree of the vinyl chloride resin can be selected in the range of 700 to 2500, and is preferably 700 to 1800. These resins may be used as a fiber or in a film composition.

In the present invention, the vinylidene chloride resin used for the vinylidene chloride resin fiber is a conventionally known resin, and the vinylidene chloride component as a main component generally has a viscosity of 70 to 50%.
At 98% by weight, a monomer copolymerizable therewith, for example, vinyl chloride, acrylonitrile, acrylic acid, an alkyl acrylate having 1 to 18 carbon atoms, an alkyl acrylate having 1 to 18 carbon atoms, and an alkyl group having 1 to 18 carbon atoms. A copolymer in which at least one of unsaturated monomers such as acrylic acid alkyl ester, maleic anhydride, maleic acid, maleic acid alkyl ester, itaconic acid, itaconic acid alkyl ester and vinyl acetate is 30 to 2% by weight. is there. Among them, vinyl chloride, methyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate are particularly desirable. One of them is 23 to 5% by weight and the vinylidene chloride component is 77 to 95% by weight. Is preferably used because of its excellent melt extrusion moldability. Additives such as plasticizers such as aliphatic dibasic acid esters and fatty acid esters, heat stabilizers represented by epoxidized vegetable oils, condensed phosphates, and alkyl stearate, etc. are added to the vinylidene chloride resin in total amount. 0.1 to 10% by weight. Other known pigments as necessary, also calcium carbonate,
In some cases, about 0.01 to 3% by weight in total of a satin finish, a lubricant or the like typified by silicon dioxide, an aliphatic amide or the like is added.

The vinylidene chloride resin contains 20 to 45% by weight of a styrene component and 5 to 5% of a butyl acrylate component.
Styrene-butyl acrylate-methyl methacrylate copolymer resin having a component composition ratio of 30 to 55% by weight and a methyl methacrylate component of 30 to 55% by weight, and / or a styrene component of 20 to 40% by weight and a methyl methacrylate component. Is 6
It is preferable to add a styrene-methyl methacrylate copolymer resin having a component composition ratio of 0 to 80% by weight.

In order to produce a vinyl chloride resin fiber and / or a vinylidene chloride resin fiber, these resins are conventionally used in a known method such as a dry spinning method, a melt spinning method and a wet spinning method. Can be manufactured. Monofilaments and / or multifilaments can be used as the vinyl chloride resin fibers and / or vinylidene chloride resin fibers used in the present invention. The thickness of the fiber is preferably in the range of 300 to 3000 denier, particularly preferably 600 to 3000 denier. The thickness of one multifilament is preferably in the range of 1 to 300 denier, particularly preferably in the range of 2 to 250 denier. If the thickness of the entire yarn is less than 300 denier, the strength of the fiber is insufficient and the propagation of tears cannot be prevented.
If the denier is exceeded, the fiber strength is increased, but the light transmittance is undesirably reduced.

[0010] The density of fibers, 3 to 30 g / m ^2, in particular 5 to 25 g / m ² is preferred. If it is less than 3 g / m ² , the occurrence of tearing cannot be prevented, while if it exceeds 30 g / m ² , the light transmittance is undesirably reduced. In the present invention, the vinyl chloride-based resin fibers and the vinylidene chloride-based resin fibers refer to fibers or yarns made of fibers. The surface treatment may be performed at the fiber stage or as a yarn.

[0011] Silicone oil for surface treatment is a fluid oil having a relatively low polymerization degree and mainly composed of a linear or branched diorganopolysiloxane.
Specifically, for example, dimethyl silicone oil, methyl hydrogen silicone oil, methyl phenyl silicone oil, amino-modified silicone oil, alkyl-modified silicone oil, phenyl-modified silicone oil, carboxyl-modified silicone oil, higher fatty acid-modified silicone oil, epoxy-modified silicone oil,
Vinyl group-containing silicone oil, alcohol-modified silicone oil, polyether-modified silicone oil, alkyl / polyether-modified silicone oil, fluorine-modified silicone oil, polyoxyalkylene-modified silicone oil, alkoxysilane, reactive siloxane oligomer, and their structures And other silicone elastomers. These silicone oils may be used alone or in combination of two or more.

For the surface treatment of the vinyl chloride resin fiber, silicone oil may be used as it is, or may be dissolved or emulsified in a solvent. Solvents for dissolution include alcohols, for example, hexadecyl alcohol, octadecyl alcohol and the like: esters, for example, dioctyl sebacate, dilauryl phthalate, isooctyl stearate, isooctyl stearate, isopropyl myristate and the like. When emulsifying the silicone oil of the present invention, a known emulsifier can be used. For example, nonionic surfactants such as polyoxyethylene alkyl ether and polyoxyethylene alkyl phenyl ether,
Cationic surfactants such as alkyl ammonium salts and alkyl benzyl ammonium salts, anionic surfactants, and the like can be used. The amount of the emulsifier used is preferably 0.1% to 20% based on the silicone oil. 0.1
When the amount is less than 20%, no emulsion is generated, and when the amount is more than 20%, the durability is adversely affected.

It is preferable to disperse and mix solid fine particles in the treating agent of the present invention since the effect of preventing fusion between the film and the yarn is increased. As the solid fine particles, for example, fine particles such as silica, alumina, water-insoluble lithium silicate, calcium carbonate, talc, iron hydroxide, tin hydroxide, titanium oxide, and barium sulfate are used. Among them, silica, calcium carbonate, alumina , Talc is preferred. These may be used alone or in combination.

The average particle diameter of the solid fine particles to be used is 15 μm or less, preferably 0.01 to 5 μm, more preferably 0.05 to 3 μm. When the average particle diameter exceeds 15 μm, the yarn tends to be white and devitrified, and when the average particle diameter is less than 0.01 μm, the stability of the treating agent may be lacking, which is not preferable. It is important that the content of the solid fine particles is less than 5% based on the silicone oil.

When used as an emulsion, it is preferable to further incorporate a crosslinking agent. As a crosslinking agent,
Phenol resins, amino resins, amine compounds, aziridine compounds, azo compounds, isocyanate compounds, epoxy compounds, silane compounds and the like, and particularly, amine compounds, aziridine compounds, epoxy compounds It is suitable. As amine compounds,
Aliphatic polyamines such as diethylenetriamine, triethylenepentamine and hexamethylenediamine; 3,3'-
Alicyclic amines such as dimethyl-4,4'-diaminodicyclohexylmethane, isophoronediamine; 4,4'-
Aromatic amines such as diaminodiphenylmethane and m-phenylenediamine are used. Aziridine compounds include tris-2,4,6- (1-aziridinyl)-
1,3,5-triazine, trimethylolpropane-tri-β-aziridinylpropionate, tris [1-
(2-methyl) aziridinylyl] phosphine oxide,
Hexa [1- (2-methyl) -diaridinyl] triphosphatriazine and the like are used.

Epoxy compounds include epoxidized novolak resins formed by the reaction of epichlorohydrin with the reaction product of bisphenol A or bisphenol F with epichlorohydrin, the resin reaction product of phenol (or substituted phenol) with formaldehyde, epichlorohydrin And aliphatic polyhydric alcohols such as glycerol, 1,4-butanediol, poly (oxypropylene) glycol or similar polyhydric alcohol components, resinous reaction products, and resins obtained by epoxidation using peracetic acid, etc. Is used. In the case of epoxy compounds, it is preferable to use a tertiary amine or a quaternary ammonium salt in combination as a catalyst.

These crosslinking agents can be used in amounts ranging from 0.1 to 30% by weight based on the silicone oil. In particular, the range of 0.5 to 10% by weight is preferable. Further, if necessary, a liquid dispersion medium is further blended. Such liquid dispersion media include hydrophilic or water-miscible solvents including water, and water; monohydric alcohols such as methyl alcohol, ethyl alcohol, and isopropyl alcohol; polyhydric alcohols such as ethylene glycol, diethylene glycol, and glycerin. Cyclic alcohols such as benzyl alcohol; cellosolve acetates; ketones and the like.

Further, additives such as an anti-adhesion agent and an antistatic agent can be mixed with the surface treatment agent composed of silicone oil, if necessary. As the anti-stick agent, a metal soap may be used, and examples thereof include aluminum stearate, zinc stearate, and magnesium stearate, and magnesium stearate is particularly preferable.
The amount of these additives is 5% based on the weight of the silicone oil.
The following is preferred.

The surface treatment of the vinyl chloride resin fiber with the silicone oil may be performed by any known coating method such as a roll coating method, a gravure coating method, a reverse coating method, and a dip coating method.

As a drying method for drying the applied silicone oil emulsion, for example, a forced drying method such as a natural drying method, a hot air drying method, or an infrared drying method can be employed. The heating temperature at the time of forcible drying is determined by the resin to be applied, but is 50 to 250 ° C., preferably 70 to 200 ° C.
It is in the range of ° C. The amount of the surface treatment agent adhered to the vinyl chloride resin fiber and the vinyl chloride resin fiber is preferably in the range of 0.5 to 30%, particularly preferably 2 to 20% based on the weight of the resin fiber. If the amount of adhesion to the vinyl chloride resin fiber is less than 0.5%, the durability will not be sufficiently excellent.
If it is more than 0%, the fibers become too strong and the initial physical properties of the film sandwiching the fibers are undesirably reduced.

When the vinylidene chloride-based resin fiber thus surface-treated is sandwiched between vinyl chloride-based resin films, the arrangement of the fibers is linear, lattice-shaped in various shapes, and Japanese Patent Publication No. 40-25191. And any of random shapes as described in the above. As a method of sandwiching the fiber and the film, a conventionally known method may be adopted. For example, a method of heat-pressing the film prepared above on both sides of the fiber, or a method of sandwiching via an adhesive, or while extruding a resin composition with an extruder, the film still in a molten state is coated on both sides of the fiber. Or a method of laminating and pressing one side at a time.

In the vinyl chloride resin film composition according to the present invention, a plasticizer, an antifogging agent, an antifog agent, a lubricant, a heat stabilizer, an ultraviolet absorber, an inorganic And various additives such as an antioxidant, a stabilizing aid, an antistatic agent, an antifungal agent, an antialgal agent, and a coloring agent.

As the plasticizer, those commonly used for plasticizing vinyl chloride resins are used. For example, low molecular weight polyhydric alcohols having a molecular weight of 250 or less, phthalic acid derivatives, isophthalic acid derivatives, adipic acid derivatives, maleic acid derivatives, citric acid derivatives, itaconic acid derivatives, oleic acid derivatives, ricinoleic acid derivatives and the like can be mentioned. These plasticizers may be used alone or in combination of two or more. The amount of these plasticizers is set to be equal to 100 parts of the vinyl chloride resin in order to balance the flexibility and strength of the film.
It should be selected from the range of 30 to 60 parts by weight with respect to parts by weight.

Other examples include an epoxy plasticizer and an organic phosphate. As an epoxy plasticizer,
There are epoxidized vegetable oils such as epoxidized soybean oil and epoxidized linseed oil and epoxy resins. These epoxy plasticizers are added in an amount of 0.1 to 100 parts by weight of the resin.
The amount is from 0.01 to 10 parts by weight, preferably from 0.1 to 5 parts by weight. The compounding amount of the organic phosphate plasticizer is
An appropriate amount is in the range of 1 to 10 parts by weight, particularly 2 to 8 parts by weight, based on 100 parts by weight of the vinyl chloride resin.

As the antifogging agent, nonionic surfactants are preferable, and ether-type ones such as polyoxyethylene ether, polyoxyethylene alkylaryl ether and polyoxyethylene polyoxypropylene ether, and polyhydric alcohols And ester type such as polyoxyethylene ether of glycerin ester and polyoxyl ethylene ether of sorbitan ester. Hereinafter, suitable nonionic surfactants will be exemplified.

(A) A partial ester of a polyhydric alcohol such as sorbitan, sorbitol, mannitol, mannitol, glycerin, diglycerin and a fatty acid having 12 to 22 carbon atoms. (B) The alkylene oxide is ethylene oxide or propylene oxide, The addition mole number is 1 to 20 mol, and the polyhydric alcohol is sorbitan, sorbitol, mannitol, mannitol, glycerin, diglycerin,
Fatty acid esters of polyoxyalkylene polyhydric alcohols in which the fatty acid has 12 to 22 carbon atoms (c) A mixture of (a) and (b). These mixtures are obtained as mixtures of monoesters, diesters and triesters of polyhydric alcohols. Generally, an ester mixture having a high content of the diester component is preferred. The blending amount of the nonionic surfactant is selected from the range of 0.5 to 5 parts by weight based on 100 parts by weight of the vinyl chloride resin. In particular, 1.0 to 3.0 parts by weight is appropriate.

Examples of the antifog include fluorine-based surfactants. Specifically, the C of the hydrophobic group of a normal surfactant
Is a surfactant in which part or all of H bonded to is substituted with F, particularly a surfactant containing a perfluoroalkyl group or a perfluoroalkenyl group. The blending amount of the fluorine-based surfactant is 1 vinyl chloride resin.
0.01 parts by weight or more and 0.5 parts by weight or less per 100 parts by weight is sufficient, and the preferable range of the compounding amount is 0.02 to 0.1 part by weight.
2 parts by weight.

Examples of the lubricant or heat stabilizer include chelators such as fatty acid lubricants, fatty acid amide lubricants, ester lubricants, polyethylene wax, liquid paraffin, and organic phosphite compounds which are generally used for agricultural films; And β-diketone compounds. As the β-diketone compound, dibenzoylmethane,
Preferred are methoxybenzoyl benzoylmethane, chlorobenzoyl benzoylmethane, palmitylbenzoylmethane and the like. The amount of these lubricants and heat stabilizers is
In the range from 0.01 to 2.0 parts by weight, in particular from 0.04 to 1.
0 parts by weight is preferred.

The ultraviolet absorber may be any one which is usually blended in an agricultural vinyl chloride film, and includes various ultraviolet absorbers such as benzotriazole, benzophenone, salicylate, hydroquinone and cyanoacrylate. Can be For example, Japanese Patent Publication No. 62-38
No. 143, column 27, line 9 to column 9, line 34; and JP-B-62-53543, column 7, lines 13 to 36. Agents and benzophenone ultraviolet absorbers are preferred. Specifically, the following are mentioned.

2- (2'-hydroxyphenyl) benzotriazole, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-5) which are benzotriazole-based ultraviolet absorbers
-Methylphenyl) -5-carboxylic acid butyl ester benzotriazole, 2- (2'-hydroxy-5'-methylphenyl) -5,6-dichlorobenzotriazole, 2- (2'-hydroxy-5'-methyl Phenyl)
-5-ethylsulfonebenzotriazole, 2- (2 ′
-Hydroxy-5'-t-butylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-5 '
-T-butylphenyl) benzotriazole, 2-
(2'-hydroxy-5'-aminophenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-dimethylphenyl) benzotriazole, 2- (2'-hydroxy-3', 5'-dimethyl Phenyl) -5-methoxybenzotriazole, 2- (2′-methyl-4′-
Hydroxyphenyl) benzotriazole, 2- (2 ′
-Stearyloxy-3 ', 5'-dimethylphenyl)
-5-methylbenzotriazole, 2- (2'-hydroxy-5-carboxylic acid phenyl) benzotriazole ethyl ester, 2- (2'-hydroxy-3'-methyl-5'-t-butylphenyl) benzotriazole, 2
-(2'-hydroxy-3 ', 5'-di-t-butylphenyl) -5-chlorobenzotriazole, 2- (2'
-Hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-5'-methoxyphenyl) benzotriazole, 2- (2'-hydroxy-3 ' , 5'-Di-t-butylphenyl) -5-chlorobenzotriazole, 2-
(2′-hydroxy-5′-cyclohexylphenyl)
Benzotriazole, 2- (2′-hydroxy-4 ′,
5'-dimethylphenyl) -5-carboxylic acid benzotriazole butyl ester, 2- (2'-hydroxy-
3 ', 5'-dichlorophenyl) benzotriazole,
2- (2'-hydroxy-4 ', 5'-dichlorophenyl) benzotriazole, 2- (2'-hydroxy-
3 ', 5'-dimethylphenyl) -5-ethylsulfonebenzotriazole, 2- (2'-hydroxy-4'-
Octoxyphenyl) benzotriazole, 2- (2 ′
-Hydroxy-5'-methoxyphenyl) -5-methylbenzotriazole, 2- (2'-hydroxy-5'-
Methylphenyl) -5-carboxylate benzotriazole, 2- (2′-acetoxy-5′-methylphenyl) benzotriazole and the like.

A benzophenone-based ultraviolet absorber, 2
-Hydroxy-4-methoxybenzophenone, 2,4-
Dihydroxybenzophenone, 2-hydroxy-4-n
-Octoxybenzophenone, 2-hydroxy-4-methoxy-2'-carboxybenzophenone, 2,2'-
Dihydroxy-4,4'-dimethoxybenzophenone,
2-hydroxy-4-benzoyloxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfonebenzophenone, 2,2 ', 4,4'-tetrahydroxybenzophenone, , 2'-dihydroxy-4,4'-
Dimethoxybenzophenone, 2-hydroxy-5-chlorobenzophenone, bis- (2-methoxy-4-hydroxy-5-benzoylphenyl) methane and the like. The ultraviolet absorbers can be used alone or in combination of two or more. The compounding amount is in the range of 0.01 to 3.0 parts by weight, particularly 0.0
2 to 2.0 parts by weight is preferred.

In the present invention, an inorganic substance that absorbs in the infrared region can be blended for the purpose of improving heat retention. Specifically, the following are mentioned. Magnesium carbonate,
Magnesium silicate (talc), silicon oxide, aluminum oxide, barium sulfate, calcium sulfate, magnesium hydroxide, aluminum hydroxide, aluminum hydroxide, calcium hydroxide, metal phosphate, hydrotalcites (hydrous or anhydrous) Aluminum / magnesium basic carbonate); aluminum / zinc basic carbonate lithium carbonate-aluminum hydroxide inclusion compound, and the like. Of these, aluminum hydroxide, magnesium hydroxide,
Silicon oxide, magnesium carbonate, and hydrotalcites are particularly preferable because they do not decrease the transparency of the film. One or more of these inorganic substances can be added, and the compounding amount is preferably in the range of 0.5 to 10 parts by weight, particularly preferably in the range of 2 to 10 parts by weight per 100 parts by weight of the vinyl chloride resin. .

As the compound which can be used as an antioxidant, phenolic and sulfuric antioxidants can be used, and specifically, 2,6-di-butyl-4-methylphenol-
2,2'-methylenebis (6-tert-butyl-4-
Ethylphenol), dilaurylthiodipropionate and the like. These antioxidants can be used alone or in combination of two or more.

Compounds that can be used as a stabilizing aid include triphenyl phosphite, dioctyl phenyl phosphite, tris (nonylphenyl) phosphite, diphenyl indecyl phosphite, trilauryl trithio phosphite, diphenyl acid phosphite and the like. Can be given. These stabilizing aids can be used alone or in combination of two or more.

Examples of the antistatic agent include polyoxyethylene alkylamine, polyglycol ether, p-
And sodium styrenesulfonate. As the fungicide and the anti-algal agent, various compounds generally used in agricultural vinyl chloride films can be used.
Examples thereof include organic nitrogen compounds, and specific examples thereof include imidazole derivatives, anilide derivatives, urea derivatives, ammonium derivatives, triazine derivatives, and phthalimide derivatives. Examples of usable coloring agents include phthalocyanine blue, phthalocyanine green,
Hansa Yellow, Alizarin Lake, titanium oxide, zinc white, permanent red, quinacridone, carbon black and the like can be mentioned. These colorants can be used alone or in combination of two or more.

The above various resin additives can be selected in a range that does not deteriorate the properties of the film, usually in a range of 5 parts by weight or less based on 100 parts by weight of the vinyl chloride resin.
To blend the resin additives into the vinyl chloride resin, weigh each required amount, and use a ribbon blender, Banbury mixer,
What is necessary is just to use a super mixer and other conventionally known compounding machines and mixers.

The resin composition thus obtained can be formed into a film by a method known per se, for example, a melt extrusion molding method (including a T-die method and an inflation method),
A known method such as a calendering method or a solution casting method may be used. The thickness of the film is 0.03-
0.3 mm range, preferably 0.05-0.2 mm
It is preferable to set it in the range.

In the vinyl chloride resin film for agricultural use according to the present invention, an acrylic resin film is formed on one or both surfaces of the film. As the acrylic resin to be used, hydroxyalkyl (meth) acrylates 5 to 4
0% by weight, 0 to 20% by weight of an α, β-unsaturated carboxylic acid containing one or more carboxyl groups in the molecule and another vinyl monomer copolymerizable therewith. The polymer obtained by the above is preferred.

Examples of the hydroxyalkyl (meth) acrylate include hydroxymethyl acrylate, hydroxymethyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl acrylate, 3-hydroxypropyl methacrylate, 2-hydroxybutyl acrylate, 2-hydroxybutyl methacrylate, 4-hydroxybutyl acrylate, 4-
Examples thereof include hydroxybutyl methacrylate, 2-hydroxypentyl acrylate, 2-hydroxypentyl methacrylate, 6-hydroxyhexyl acrylate, and 6-hydroxyhexyl methacrylate. In these hydroxyalkyl (meth) acrylate compounds, the obtained acrylic resin is easily soluble in an organic solvent, improves the adhesion between the acrylic resin and the base vinyl chloride resin film, and further exudes to the film surface. It is a component that greatly contributes to the action of suppressing the migration property of the plasticizer. When the ratio of the hydroxyalkyl (meth) acrylate in the acrylic resin is less than 5% by weight,
The effect of improving the solubility in an organic solvent, the adhesion performance to a base film, and the durability cannot be sufficiently exhibited. On the other hand, if it is more than 40% by weight, the cost is high and the effect obtained is large compared to the cost increase. Not so desirable.

The α, β-unsaturated carboxylic acid having one or more carboxyl groups in the molecule includes acrylic acid, methacrylic acid, itaconic acid, maleic acid, maleic anhydride, aconitic acid, fumaric acid, Crotonic acid, itaconic acid and the like. When these compounds are used in combination with the hydroxyalkyl (meth) acrylate, the adhesion and durability between the acrylic resin and the base film are improved. The use amount of these is preferably 0.5 to 20% by weight. If it is more than this, the property that the films adhere to each other when the film is moistened with moisture (the blocking property when wet) is undesirably enhanced.

Other vinyl monomers copolymerizable with the hydroxyalkyl (meth) acrylate and the α, β-unsaturated carboxylic acid include alkyl (meth) acrylate or a mixture thereof with alkenylbenzene. Is raised. Examples of the alkyl (meth) acrylate include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, and the like. Decyl acrylate, methyl methacrylate, ethyl methacrylate, methacrylic acid
Examples thereof include n-propyl ester, isopropyl methacrylate, n-butyl methacrylate, 2-ethylhexyl methacrylate, and decyl methacrylate, and are generally acrylic having 1 to 20 carbon atoms in the alkyl group. Acid alkyl esters and / or alkyl esters of methacrylic acid having 1 to 20 carbon atoms in the alkyl group are used.

The alkenylbenzene used in the present invention includes, for example, styrene, α-methylstyrene, vinyltoluene and the like. When a monomer comprising a mixture of such an alkenylbenzene and an alkyl (meth) acrylate is used, it usually varies depending on the amount of the α, β-ethylenically unsaturated carboxylic acid to be used. Use ratio of alkyl acrylate of 10
% By weight or more.

In particular, the acrylic resin of the present invention comprises a monomer comprising a mixture of the above-mentioned alkyl (meth) acrylate and an alkenylbenzene in the range of 40 to 60.
What contains by weight is preferable. When such an acrylic resin is subjected to surface treatment on a base vinyl chloride resin film, another resin compatible with the acrylic resin can be mixed for the purpose of improving adhesion to the film and the like. As the other resin, a vinylidene fluoride resin, an acrylic resin having a perfluoroalkyl group in a side chain, a cellulose acetate butyrate resin, a silicone resin, and the like are particularly effective.

In order to polymerize an acrylic resin, a predetermined amount of each monomer is combined, charged together with an organic solvent into a polymerization vessel, a polymerization initiator and, if necessary, a molecular weight regulator are added, and the mixture is heated with stirring. Good.

The acrylic resin film formed on one or both surfaces of the vinyl chloride resin film is preferably applied by dissolving the acrylic resin in the above-mentioned organic solvent. To form a coating of the acrylic resin on the surface of the vinyl chloride resin film, dissolve the acrylic resin in an organic solvent,
It is preferable to apply and dry by various coating methods known per se, such as a spray coating method, a roll coating method, a gravure coating method, a reverse coating method, a dip coating method, and the like, such as a screen printing method and a flexographic printing method. Available drying methods include, for example, hot air drying, infrared drying, far infrared drying and the like. The drying temperature is preferably a temperature at which the organic solvent is scattered, that is, the boiling point of the organic solvent in which the acrylic resin is dissolved. The drying time is
Shorter is better. Therefore, at a temperature above the boiling point of the organic solvent,
Drying should be as short as possible.

The thickness of the acrylic resin film formed on the surface of the base film depends on the thickness of the base film.
Select from the range of 0.5 to 10 μm. When the thickness is more than 10 μm, since there is a difference in flexibility between the base film and the coating, phenomena such as peeling of the coating from the base film are likely to occur, and the coating is cracked to lower the strength of the base film. This phenomenon is undesirable. 0.5
When the thickness is smaller than μm, the effect of improving the durability of the base film is not exhibited, so that it is not preferable. The thickness of the coating is preferably proportional to the thickness of the base film within the above range.

In actual use of the agricultural vinyl chloride resin film according to the present invention, when the coating is formed on only one side, the side on which the coating is provided is outside the house or tunnel. It is good to expand in this way. Further, it is preferable to form the acrylic resin film before sandwiching the vinyl chloride resin fiber and / or the vinylidene chloride resin fiber.

[0048]

The agricultural polyvinyl chloride resin film of the present invention is excellent in durability without deterioration in physical properties or appearance change, and therefore is used not only for coating for houses (greenhouses) and for tunnels, but also for covering houses. It can also be used for parts such as sides, skylights, doorways, wives, etc., and is extremely valuable as an agricultural covering.

[0049]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist. Examples 1 to 5 and Comparative Examples 1 to 3 (1) Production of vinyl chloride resin film Polyvinyl chloride (degree of polymerization = 1300) 100 parts by weight Dioctyl phthalate 45 parts by weight Tricresyl phosphate 5 parts by weight Epoxy resin (trade name) "EP-828") 1 part by weight Ba-Zn liquid stabilizer 1 part by weight Barium stearate 0.2 part by weight Zinc stearate 0.4 part by weight Sorbitan monopalmitate 1.5 parts by weight β-diketone compound (dibenzoyl) (Methane) 0.1 part by weight Benzotriazole-based UV absorber 0.05 part by weight (trade name "TINUVIN-P") Fluorine-based surfactant (trade name "Unidyne DS-401") 0.2 parts by weight After weighing the resin raw materials and the resin additives, stirring and mixing them with a super mixer for 10 minutes, 165 ° C.
The mixture was kneaded on a heated roll, and a transparent vinyl chloride resin film having a thickness of 0.10 mm was produced using an L-type calender.

(2) Formation of Coating Film 150 parts by weight of isopropyl alcohol and 2 parts of
-20 parts by weight of hydroxyethyl methacrylate, 10 parts by weight of acrylic acid, 40 parts by weight of methyl methacrylate and 30 parts by weight of ethyl methacrylate, 0.5 part by weight of benzoyl peroxide, and 8 parts by weight under a nitrogen gas stream.
The polymerization reaction was performed at 0 ° C. for 10 hours. Isopropyl alcohol was added to the obtained copolymer solution to reduce the solid content to 2%.
It was adjusted to 0% by weight to obtain a coating resin. After coating the coating resin on one side of the base film produced in the above (1) by a gravure coating method, the coating resin is retained for 10 seconds in a hot-air drying oven controlled at a temperature of 150 ° C. to disperse the solvent. A coating of about 2 μm was formed.

(3) Surface treatment Fibers of the type shown in Table 1 are treated with a surface treatment agent of the type shown in the table by a roll coating method, and in the case of emulsion, they are placed in warm air at 90 ° C. for 1 minute. The fibers stayed and were subjected to a surface treatment.

(4) Manufacture of Agricultural Film The surface-treated fiber is a lattice having a fiber spacing of 3 cm between two vinyl chloride resin films on which the acrylic resin film is not formed. Placed in a shape
Under the heating condition of 50 ° C, heat-bonded with a laminator,
An agricultural film was created. The resulting film was subjected to an impact test and a weather resistance test.

(Weather Resistance Test) The test film was exposed outdoors to a closed house at 45 ° on the south side, and the weather resistance of the film portion in contact with the fibers was evaluated by visual observation. The evaluation criteria for the weather resistance are as follows. 5 points: no change 4 points: slightly brown spots 3 points: brown spots 2 points: many brown spots 1 point: overall browning In addition, outdoor exposure was carried out in a test field in the ash fall area from H6.6 to H.
Tested to 7.6. (Impact test) The impact strength of the above test film was measured with a puncture tester manufactured by Toyo Seiki Co., Ltd., and the residual strength was calculated by the following equation. The measurement temperature is −5 ° C.
However, the film was set so that the dart hit the yarn. Residual strength (%) = (strength after outdoor exposure) / (strength before outdoor exposure) x 100

[0054]

[Table 1]

The notes in Table 1 mean the following: * 1: 1: Tevilon manufactured by Teijin Limited Vinyl chloride resin fiber, multifilament yarn 1200 denier / 24
0 Filament 2: manufactured by Asahi Kasei Kogyo Co., Ltd. "Saran" vinylidene chloride resin fiber, monofilament yarn 1800 denier * 2 TSF451: dimethyl silicone oil manufactured by Toshiba Silicone Co., Ltd. TSF484: methyl hydrogen silicone manufactured by Toshiba Silicone Co., Ltd. Oil TSF4706: Amino-modified silicone oil manufactured by Toshiba Silicone Co., Ltd. TEX103: Dimethyl silicone oil emulsion manufactured by Toshiba Silicone Co., Ltd. TSW831: Methyl hydrogen silicone oil emulsion manufactured by Toshiba Silicone Co., Ltd. A-104: Acrylic manufactured by Toagosei Co., Ltd. System emulsion

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kanako Oyama 2 Oike, Iwatsuka-cho, Nakamura-ku, Nagoya-shi, Aichi Prefecture Mitsubishi Chemical MKV Corporation Nagoya Office (72) Inventor Atsushi Obayashi 2 Oiketsu, Iwatsuka-cho, Nakamura-ku, Nagoya-shi, Aichi Prefecture Address Mitsubishi Chemical MKV Corporation Nagoya Office (56) References JP-A-59-146847 (JP, A) JP-A-7-186343 (JP, A) JP-A-61-130427 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 A01G 9/14 A01G 13/02

Claims (4)

(57) [Claims] [Claim 1] Between two vinyl chloride resin films,
A thickness of 0.5 to 10 μm on one or both sides of a vinyl chloride resin film obtained by sandwiching a yarn group composed of vinyl chloride resin fibers and / or vinylidene chloride resin fibers surface-treated with silicone oil; A vinyl chloride resin film for agricultural use, characterized by having an acrylic resin film formed thereon. 2. An acrylic resin film formed on the surface of a vinyl chloride resin film, comprising a hydroxyalkyl (meth) acrylate compound in an amount of from 5 to 40% by weight and having at least one carboxyl group in the molecule. 2. A vinyl chloride resin film for agricultural use according to claim 1, which is a polymer obtained by copolymerizing 0 to 20% by weight of .beta.-unsaturated carboxylic acid and another vinyl monomer copolymerizable therewith. . To 3. A silicone oil, made by incorporating solid particulate claim 1 or 2 agricultural vinyl chloride resin film according. 4. The agricultural polyvinyl chloride resin film according to claim 1, wherein the amount of the silicone oil applied is 0.5 to 30% based on the weight of the vinyl chloride resin fiber.