JPH10306186A - Agricultural vinyl chloride resin film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a resin film which is excellent in weatherability, cold resistance, in-soil stability, and persistence of antifogging properties and clarity by compounding a vinyl chloride resin with specified amts. of a specific org. phoshoric ester, a specific metal salt of an org. phosphoric ester, a specific epoxy acrylate resin, and an antifogging agent. SOLUTION: 100 pts.wt. vinyl chloride resin (e.g. PVC) is compounded with 0.01-10 pts.wt. org. phosphoric ester represented by formula I [wherein R<1> to R<4> are each 6-18C alkyl, cycloalkyl, phenylalkyl, or (alkyl)aryl], 0.01-5 pts.wt. at least one metal salt of an org. phosphoric ester selected from among salts represented by formulas II and III [wherein R<5> to R<7> are each 4-22C alkyl, cycloalkyl, phenylalkyl, or (alkyl)aryl; and M is Zn or Ca], 0.1-10 pts.wt. epoxy acrylate resin having an epoxy value of 0.01 or higher and a wt. average mol.wt. of 2,000 or higher, and 0.1-5 pts.wt. antifogging agent (e.g. a sorbitan fatty acid ester).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vinyl chloride resin film for agricultural use. For details, weather resistance, cold resistance,
The present invention relates to a vinyl chloride resin film for agricultural use which is excellent in soil stability, sustained antifogging property and sustained transparency.

[0002]

2. Description of the Related Art Conventionally, vinyl chloride resin films have been widely used as agricultural covering materials such as houses and tunnels. This is because the vinyl chloride resin film is superior in weather resistance, transparency, flexibility, heat retention and the like as compared with other resins, and is suitable as an agricultural covering material. On the other hand, nowadays, the work of replacing is small,
The demand for agricultural covering materials that maintain the above performance for a long time is increasing day by day.

In order to further improve the weather resistance of a vinyl chloride resin film, various stabilizers have been added. For example, a method of adding tricresyl phosphate (hereinafter, referred to as TCP) to improve weather resistance is known, and JP-A-61-4747 and JP-A-2-272048 disclose specific organic phosphorus. A method of adding an acid ester metal salt has been proposed.

Further, Japanese Patent Application Laid-Open No. 57-174331,
JP-A-4-46945 and the like also report that the addition of a specific organic phosphate ester improves weather resistance and stain resistance. Further, Japanese Patent Laid-Open No. 60-9 / 1985
No. 0241 and the like, by adding an epoxy acrylate resin having a specific epoxy value and a weight average molecular weight, there is an effect of preventing color burn of the contact portion between the metal and the film used as aggregate in an agricultural house. It has been reported.

[0005]

However, according to the findings of the present inventors, TCP has poor cold resistance, and the organic phosphoric acid ester disclosed in the above-mentioned publication,
Weather resistance and cold resistance are slightly improved when using organic phosphate metal salts, etc., but when actually used in agricultural houses or tunnels, the deterioration in the part buried in the soil to fix the film is particularly significant. However, there was a problem in quality as a practical agricultural covering material. In addition, sustained antifogging properties and sustained transparency were still insufficient.

Therefore, an object of the present invention is to improve the weather resistance and cold resistance without using a large amount of TCP, to solve the problem of stability in the soil, and at the same time, to achieve a continuous antifogging property and a continuous transparency. It is to provide an improved agricultural polyvinyl chloride film.

[0007]

Means for Solving the Problems As a result of diligent studies on the above-mentioned problems, the present inventors have found that a specific organic phosphate, a specific organic phosphate metal salt,
Excellent weather resistance and cold resistance, stability in soil, sustained anti-fogging and sustained transparency by combining the specific amount of each of epoxy acrylate resin with specific epoxy value, weight average molecular weight and anti-fog agent We also succeeded in obtaining a vinyl chloride resin film for agricultural use with improved properties. Furthermore, it has been found that by adding a specific ultraviolet absorber to the above-mentioned composition, not only weather resistance but also soil stability can be further improved.

However, the gist of the present invention is that the general formula (1) [Chemical Formula 4] per 100 parts by weight of the vinyl chloride resin is used.

[0009]

Embedded image [In the general formula (1), R ¹ , R ² , R ³ and R ⁴ have 6 to 6 carbon atoms.
18 alkyl groups, cycloalkyl groups, phenylalkyl groups, aryl groups, and alkyl-substituted aryl groups] 0.01 to 10 parts by weight of an organic phosphoric ester represented by the general formula (2):

[0010]

Embedded image And the general formula (3)

[0011]

Embedded image [In the general formulas (2) and (3), R ⁵ , R ⁶ and R ⁷
Represents an alkyl group having 4 to 22 carbon atoms, a cycloalkyl group, a phenylalkyl group, an aryl group, an alkyl-substituted aryl group, and M represents zinc or calcium. Compound 0.0
1 to 5 parts by weight, 0.1 to 10 parts by weight of an epoxy acrylate resin having an epoxy value of 0.01 or more and a weight average molecular weight of 2000 or more, and 0.1 to 5 parts by weight of an antifogging agent. Agricultural vinyl chloride resin film.

Another embodiment of the agricultural vinyl chloride resin film according to the present invention is a group consisting of a benzophenone-based ultraviolet absorber and a benzotriazole-based ultraviolet absorber as a fifth component in addition to the above four-component additive. A film containing 0.01 to 5 parts by weight of at least one ultraviolet absorbent selected from the group consisting of 100 parts by weight of a vinyl chloride resin.

A feature of the present invention is that at least one of the organic phosphoric acid esters represented by the general formula (1) and the organic phosphoric acid ester metal salts represented by the general formulas (2) and (3) is used. An epoxy acrylate resin satisfying the above conditions,
Another object of the present invention is to combine specific amounts of the four additives of the antifogging agent in combination with the vinyl chloride resin. By adopting such a configuration, weather resistance and cold resistance are excellent, stability in soil,
The present invention can provide a vinyl chloride resin film for agricultural use having improved sustained antifogging property and sustained transparency.

The above-mentioned soil stability is the stability of the film in the soil. If the soil stability is inferior in practical use, plasticizers, stabilizers, etc. will escape from the film into the soil when the hem is buried in the soil for a long time to fix the agricultural PVC resin film. However, there is a problem that the mechanical strength of the metal is deteriorated. In the present invention, this problem has been successfully solved by combining specific amounts of the above four types of additives with the vinyl chloride resin.

Accordingly, the vinyl chloride resin film for agriculture according to the present invention can be used for a long time as a covering material for greenhouses, tunnels and the like, and is extremely useful as an agricultural material.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The vinyl chloride resin film for agricultural use according to the present invention comprises 0.01 to 10 parts by weight of the organic phosphoric acid ester represented by the general formula (1) and 100 to 100 parts by weight of the vinyl chloride resin. ) And at least one compound of the organophosphate metal salt represented by the general formula (3):
0.1 to 5 parts by weight of an epoxy acrylate resin having an epoxy value of 0.01 to 5 parts by weight and an epoxy value of 0.01 or more and a weight average molecular weight of 2,000 or more, and 0.1 to 5 parts by weight of an antifogging agent are added and mixed. It is manufactured by forming a composition and forming it into a film. If necessary, 0.01 to 5 parts by weight of at least one UV absorber selected from the group consisting of a benzophenone UV absorber and a benzotriazole UV absorber may be added to the resin composition. .

In the present invention, the vinyl chloride resin is
Besides polyvinyl chloride, vinyl chloride and other monomers, for example, ethylene, propylene, vinylidene chloride, vinyl acetate, vinyl ether, acrylonitrile, maleic acid,
It includes copolymers with maleic acid ester, acrylic acid, acrylic acid ester, methacrylic acid, methacrylic acid ester, etc., and also includes copolymers blended with polyvinyl chloride and other polymers. Use at least one vinyl chloride resin
Mixtures of more than one species may be used. The polymerization degree of the vinyl chloride resin is preferably in the range of about 800 to about 2500. More preferably, the range is from about 1000 to about 1800.

The organic phosphate ester used in the present invention is a compound represented by the above general formula (1), and is represented by R ¹ , R ² , R ³ or R ⁴ in the general formula (1). The hydrocarbon residues are the same or different and have 6 to 1 carbon atoms.
8 alkyl, cycloalkyl, phenylalkyl, aryl, and alkyl-substituted aryl groups.

Specifically, examples of the alkyl group include hexyl, isohexyl, heptyl, isoheptyl, octyl, isooctyl, 2-ethylhexyl, nonyl, isononyl, decyl, undecyl, dodecyl, Examples of the cycloalkyl group include a tridecyl group, a tetradecyl group, a hexadecyl group, and an octadecyl group. Examples of the cycloalkyl group include a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group. Examples of the phenylalkyl group include a benzyl group, a 2-methylbenzyl group, a phenylethyl group, a phenylpropyl group, a phenylisopropyl group, a phenylbutyl group, and a phenylisobutyl group. Examples of the aryl group include a phenyl group, a naphthyl group and a biphenyl group. Examples of the alkyl-substituted aryl group include a tolyl group, a xylyl group, an ethylphenyl group, a propylphenyl group, an isopropylphenyl group, a butylphenyl group, an isobutylphenyl group, a t-butylphenyl group, and a nonylphenyl group.

Specific examples of the organic phosphoric acid ester used in the present invention include, for example, a compound represented by the following chemical formula (4):

[0021]

Embedded image And 2,2-bis {4 ′-(bis [dimethylphenoxy] phosphoryloxy) phenyl} propane. The organic phosphate ester used in the present invention is used in an amount of 0.01 to 1 based on 100 parts by weight of the vinyl chloride resin.
It is blended in the range of 0 parts by weight. If the amount is less than 0.01 part by weight, improvement in weather resistance, cold resistance, stability in soil, sustained antifogging property and the like cannot be achieved. On the other hand, if the compounding amount exceeds 10 parts by weight, bleeding is liable to occur, and transparency and adhesion processability are reduced. Preferably it is 0.1 to 5 parts by weight.

The organic phosphoric acid ester metal salt used in the present invention includes the above general formulas (2) and (3)
The compound represented by these is mentioned. These may be used alone or as a mixture of two or more.
In the general formulas (2) and (3), R ⁵ , R ⁶ and R
^{As the} hydrocarbon residue represented by ⁷ , an alkyl group having 4 to 22 carbon atoms, a cycloalkyl group, a phenylalkyl group,
Examples include an aryl group and an alkyl-substituted aryl group.
Examples of the metal represented by M include zinc and calcium.

Specifically, the alkyl group having 4 to 22 carbon atoms includes butyl, isobutyl, pentyl, neopentyl, hexyl, heptyl, n-octyl,
Examples include an isooctyl group, a 2-ethylhexyl group, an n-nonyl group, an isononyl group, a decyl group and a lauryl group. As a cycloalkyl group, a cyclohexyl group, a cycloheptyl group or the like, and as a phenylalkyl group, a benzyl group,
-Methylbenzyl group, phenylethyl group, phenylpropyl group, phenylisopropyl group, phenylbutyl group,
A phenylisobutyl group; Examples of the aryl group include a phenyl group, a naphthyl group, and a biphenyl group.Examples of the alkyl-substituted aryl group include a tolyl group, a xylyl group, an ethylphenyl group, a propylphenyl group, an isopropylphenyl group, a butylphenyl group, an isobutylphenyl group, and a t-group. -Butylphenyl group, nonylphenyl group and the like.

Specific examples of the organophosphate metal salt used in the present invention include monoisodecyl phosphate,
Examples thereof include zinc salts such as diisodecyl phosphate, monododecyl phosphate, didodecyl phosphate, monooctadecyl phosphate, and dioctadecyl phosphate, and calcium salts. The organic phosphate metal salt is used in an amount of 0.01 to 100 parts by weight of the vinyl chloride resin.
It is blended in the range of 5 to 5 parts by weight. If the amount is less than 0.01 part by weight, weather resistance and sustained anti-fog properties are not improved,
If the amount is more than 5 parts by weight, bleeding is likely to occur, and the transparency and the adhesive processability deteriorate. The preferred amount is 0.05 to 3 parts by weight.

The epoxy acrylate resin used in the present invention is a resin containing an epoxy group in a copolymer mainly composed of an acrylic monomer such as an acrylate or a methacrylate. This resin is obtained, for example, by copolymerizing an alkyl acrylate and / or an alkyl methacrylate with an epoxy group-containing monomer. If necessary, another copolymerizable vinyl monomer may be further copolymerized. The polymerization method may be any of bulk polymerization, solution polymerization, emulsion polymerization, suspension polymerization and the like.

In the present invention, among these resins, a resin having an epoxy value of at least 0.01 and a weight average molecular weight of at least 2,000 is selected and used.
Preferably, the epoxy value is from 0.1 to 0.65 and the weight average molecular weight is from 5,000 to 60,000.

Here, the epoxy value is a number corresponding to the gram equivalent number of the epoxy group contained in 100 g of the epoxy acrylate resin.
g) and the epoxy equivalent shown in JIS-K7236 is assumed to be E (g / eq), the quotient of e and E is 100
There is a relationship that becomes. That is, the range of the epoxy value of 0.01 or more specified in the present invention can be translated into 10,000 (g / eq) or less in terms of epoxy equivalent, and the epoxy value of the epoxy acrylate resin according to the present invention is shown in JIS-K7236. This value can be confirmed by an epoxy equivalent test method (either a potentiometric titration method or an indicator titration method may be used).

The weight average molecular weight defined for the epoxy acrylate resin of the present invention is a value measured by gel permeation chromatography (GPC) and converted to a standard sample of polymethyl methacrylate. When the epoxy value is less than 0.01, a large amount of addition is required in order to exhibit the excellent weather resistance and stability in the soil, which are the objects of the present invention. When the weight average molecular weight is less than 2,000, problems such as plate-out, stickiness, and lumps occur as in the case of conventional epoxy compounds.

Examples of acrylic monomers copolymerized in the epoxy acrylate resin according to the present invention include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, tridecyl (meth) acrylate, and hydroxyethyl (meth) acrylate. A) acrylate, hydroxypropyl (meth) acrylate and the like. As the epoxy group-containing monomer to be copolymerized with the acrylate, glycidyl (meth) acrylate, β-methylglycidyl (meth) acrylate,
Allyl glycidyl (meth) acrylate and the like can be mentioned. Further, as vinyl monomers copolymerizable therewith, vinyl chloride, styrene, vinylidene chloride, (meth)
Acrylamide, NN-dimethylacrylamide, acrylonitrile, vinyl acetate and the like can be mentioned.

The proportion of the copolymer component monomer can be appropriately adjusted as long as the epoxy value and the weight average molecular weight of the epoxy acrylate resin are within the ranges described above. The addition amount of the epoxy acrylate resin is preferably 0.1 to 10 parts by weight based on 100 parts by weight of the vinyl chloride resin. If the amount is small, sufficient weather resistance, stability in soil, sustained transparency and the like cannot be obtained. On the other hand, if the amount is too large, bleeding may occur, resulting in a decrease in adhesive workability.

The antifogging agent used in the present invention includes a partial ester of a polyhydric alcohol and a fatty acid having 12 to 22 carbon atoms,
And alkylene oxide adducts of these esters. That is, (a) sorbitan, sorbitol,
A partial ester of a polyhydric alcohol such as mannitol, mannitol, glycerin, diglycerin and a fatty acid having 12 to 22 carbon atoms, (b) the alkylene oxide is ethylene oxide, propylene oxide, or the like; A) a polyoxyalkylene polyhydric alcohol having 1 to 20 moles of alkylene oxide per molecule of the polyhydric alcohol, and a carbon number of 12 to 22;
Esters with fatty acids, and (c) (a) and (b)
And the like. In (a), (b) and (c), the fatty acid ester may be any of a monoester, diester, and triester. However, in the mixture of (c), a mixture having a large proportion of the diester component is preferable. The compounding amount of these antifogging agents is 0.1 to 5 parts by weight per 100 parts by weight of the vinyl chloride resin. Preferably, it is 1 to 3 parts by weight. If the amount is less than 0.1 part by weight, no improvement in the sustained antifogging property is observed, which is not preferable. If the amount exceeds 5 parts by weight, weather resistance and transparency are undesirably reduced.

The vinyl chloride resin film for agricultural use according to the present invention can be further improved in weather resistance and soil stability by adding an ultraviolet absorber of a benzophenone compound or a benzotriazole compound. Examples of the ultraviolet absorber used in the present invention include 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 2,4-dihydroxybenzophenone, and 2-hydroxy-4-benzobenzophenone. -4-methoxy-2'-carboxybenzophenone and the like.

As the benzotriazole type, 2 (2 ′
-Hydroxy-5'-methylphenyl) benzotriazole, 2 (2'-hydroxy-3'-tert-butyl-5 '
-Methylphenyl-5-chlorobenzotriazole, 2
(2′-hydroxy-3 ′, 5′-di-tert-butylphenyl) -5-chlorobenzotriazole, 2- (2′-
(Hydroxy-5'-t-octylphenyl) benzotriazole and the like.

These UV absorbers may be used alone or in combination of two or more. The amount of addition is preferably in the range of 0.01 to 5 parts by weight based on 100 parts by weight of the vinyl chloride resin. If the amount is less than 0.01 part by weight, the improvement of weather resistance and stability in soil is insufficient, and if it exceeds 5 parts by weight, bleeding or the like may be caused. More preferably, it is 0.02 to 3 parts by weight.

The vinyl chloride resin film for agricultural use according to the present invention includes, in addition to the above vinyl chloride resin, an organic phosphate, an organic phosphate metal salt, an epoxy acrylate resin, an antifogging agent and an ultraviolet absorber, In response to the,
In addition, plasticizers usually blended with vinyl chloride resins,
Known additives such as a heat stabilizer, an antioxidant, a lubricant, a filler, an antifog, and a pigment can be contained in an ordinary range.

On the agricultural vinyl chloride resin film according to the present invention, a coating film of an acrylic resin emulsion can be formed on one or both sides of the film in order to improve the dust resistance. Acrylic resins include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, and isobutyl (meth) acrylate.
Acrylics such as acrylate, t-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and (meth) acrylic acid A mixture of system monomers or a copolymer thereof can be used. Furthermore, vinyl monomers copolymerizable therewith, such as vinyl chloride, styrene, vinylidene chloride, methacrylamide,
NN-dimethylacrylamide, acrylonitrile, vinyl acetate and the like can be included in the copolymer component.

The vinyl chloride resin composition for agricultural use according to the present invention is prepared by adding a predetermined amount of the above-mentioned various additives to the vinyl chloride resin, and mixing equipment usually used for mixing the vinyl chloride resin composition, for example, a ribbon. It can be easily obtained by mixing with a blender, Henschel mixer or the like. Further, the vinyl chloride resin film for agricultural use of the present invention is obtained by subjecting the above composition to a known molding method usually used for molding a vinyl chloride resin composition, for example, a melt extrusion method, a melt casting method, a calender roll method. It can be easily obtained by molding with such as.

The thickness of the vinyl chloride resin film for agricultural use according to the present invention is preferably in the range of 0.03 to 0.3 mm in consideration of strength, ease of handling during processing and spreading, and the like.

[0039]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples. Polymerization Example 1 A mixture of 70 parts by weight of methyl methacrylate, 30 parts by weight of glycidyl methacrylate and 2.0 parts by weight of azobisisobutyronitrile (hereinafter referred to as AIBN) was placed in a reaction vessel in which 67 parts by weight of toluene was refluxed under a nitrogen stream. Is added dropwise over 2 hours, and the reaction is continued under reflux for 3 hours after completion of the addition. After cooling to 90 ° C. or lower, 0.5 parts by weight of AIBN is added, and the remaining monomer is polymerized for 2 hours. The solvent was removed by drying to obtain a fine powder having an epoxy value of 0.21 and a weight average molecular weight of 12,000. This epoxy acrylate resin is used as an epoxy acrylate resin (a).

Polymerization Example 2 A reaction vessel containing 40 parts by weight of toluene was heated to 60 ° C., and the atmosphere in the vessel was replaced with nitrogen. Then, 14 parts by weight of methyl methacrylate, 86 parts by weight of glycidyl methacrylate,
AIBN 1.0 part by weight of the mixture was added dropwise over 4 hours with stirring, and after the addition was completed, stirring was continued for 6 hours. After the reaction, the solvent was dried and removed, and the resulting epoxy acrylate resin fine powder having an epoxy value of 0.6 and a weight average molecular weight of 50,000 was designated as epoxy acrylate resin (b).

Polymerization Example 3 A mixture of the monomer of Polymerization Example 1 and 3.0 parts by weight of t-butyl perbenzoate was dropped into a reaction vessel in which 150 parts by weight of xylene was heated to 160 ° C. in an autoclave. Epoxy value 0.21 obtained in the same manner as
The epoxy acrylate resin fine powder having a weight average molecular weight of 1500 is referred to as an epoxy acrylate resin (c).

Polymerization Example 4 In polymerization example 1, the monomer composition was 99 parts by weight of methyl methacrylate and 1 part by weight of glycidyl methacrylate. Thereafter, the epoxy value obtained in the same manner as in Polymerization Example 1 was 0.1.
007, an epoxy acrylate resin fine powder having a weight average molecular weight of 12,000 is referred to as an epoxy acrylate resin (d).

Examples 1 to 14, Comparative Examples 1 to 16 100 parts by weight of polyvinyl chloride (average degree of polymerization: 1300)
Dioctyl phthalate 45 parts by weight, bisphenol A type epoxy resin 1.0 part by weight, barium-zinc liquid stabilizer 1.5 parts by weight, barium stearate 0.2 parts by weight,
0.4 parts by weight of zinc stearate, 0.1 parts by weight of dibenzoylmethane, sorbitan fatty acid ester-based antifogging agent
5 parts by weight, and the above additive composition as a basic composition. This basic composition has the chemical formula (4)

[0044]

Embedded image An organic phosphate ester represented by the following chemical formula (5):

[0045]

Embedded image And chemical formula (6)

[0046]

Embedded image 1: 1 weight ratio mixture of the organic phosphoric acid ester metal salt shown in the following, and 1 selected from the epoxy acrylate resins (a), (b), (c) and (d) shown in Polymerization Examples 1, 2, 3 and 4. Species and chemical formula (7)

[0047]

Embedded image Are added in the amounts (parts by weight) shown in Table 1 and mixed and stirred with a Henschel mixer, kneaded with a mixing roll heated to 180 ° C., and further L-shaped. It was formed into a film using a calender roll to produce an agricultural vinyl chloride resin film having a thickness of 0.1 mm. The obtained agricultural vinyl chloride resin film was evaluated for weather resistance, soil stability, cold resistance, initial and sustained anti-fog properties, initial and sustained transparency by the following methods. The results are shown in [Table 2].

(1) Evaluation of weather resistance, stability in soil (residual tensile elongation at break) (%) An outdoor single-roof house with a hem of about 50 to 100 cm of a sample film embedded and fixed in soil. To 1
Two months later, the film in the ceiling portion and the film in the soil portion are collected, and the tensile elongation at break (JIS-K7127) is measured. The residual tensile elongation at break is (the tensile elongation at break of the film after stretching) / (the tensile elongation at break of the film before stretching) and is expressed as a percentage. Weather resistance from the results of the ceiling,
The soil stability was evaluated from the results in the soil section. The greater the residual tensile elongation at break, the better the weather resistance and soil stability.

(2) Evaluation of cold resistance (low-temperature impact strength) (kg
・ Cm) After the temperature of the sample film was adjusted in a low-temperature room at −20 ° C. for 24 hours, the impact strength was measured in a low-temperature room at −20 ° C. The impact strength was measured using a film impact tester manufactured by Toyo Seiki Seisaku-sho, Ltd.

(3) Evaluation of initial antifogging property (index) A sample film (length: 30 cm, width: 15 cm) is placed and fixed on the surface of the water tank. The installation conditions are as follows: the distance between the film and the water surface is 20 cm, the water temperature is 50 ° C., and the outside air temperature is 20 ° C. 24 hours after the installation, the state of the film surface is visually observed. The evaluation was made on a scale of 5 (good) to 1 (bad), and the evaluation criteria were as follows. 5: A state in which water adheres in the form of a thin film and adhesion of water droplets is not recognized. 4: A state in which water adheres in a thin film form, but adhesion of large water droplets is observed in an area of less than 20%. 3: Although water adheres in a thin film form,
A state in which large water droplets adhere to 50% of the area. 2: A state in which large water droplets are adhered in an area of 50% or more, or a state in which fine water droplets are observed in an area of 20% or more. 1: A state in which fine water droplets adhere to the entire surface. In addition, the adhesion of fine water drops
It means that the haze value (cloudiness value) specified in JIS-K7105 is increased, and that large water droplets maintain transparency without increasing the haze value.

(4) Evaluation of sustained anti-fogging property (index) (1) A sample film was collected from the ceiling of a film spread on an outdoor single-roof house for 12 months in the same manner as in the weather resistance test. ) The sustained antifogging property was evaluated in the same manner as the initial antifogging property evaluation.

(5) Evaluation of initial transparency (total light transmittance)
(%) The total light transmittance (%) of the sample film was measured with a haze meter (No. 206) manufactured by Toyo Seiki Seisaku-sho, Ltd. to evaluate the initial transparency.

(6) Evaluation of sustained transparency (total light transmittance)
(%) (1) A sample film was sampled from the ceiling of a film spread on an outdoor single-roof house for 12 months in the same manner as in the section of the weather resistance test, and the total light transmittance (%) of the sample film was determined by (5). ) Measurement was made in the same manner as in the section on initial transparency evaluation, and the continuous transparency was evaluated.

[0054]

[Table 1]

[0055]

[Table 2]

[0056]

The agricultural vinyl chloride resin film according to the present invention comprises an organic phosphate represented by the general formula (1), an organic phosphate represented by the general formula (2) and an organic phosphate represented by the general formula (3). It is characterized in that it contains at least one type of phosphate metal salt, an epoxy acrylate resin having an epoxy value of 0.01 or more and a weight average molecular weight of 2,000 or more, and a specific amount of an antifogging agent at the same time. As a result, the film is excellent in weather resistance and cold resistance, furthermore, the deterioration of the mechanical strength of the film due to the penetration of stabilizers and the like in the soil is suppressed, and further, the continuous anti-fog property and the continuous transparency are significantly improved. I was able to get. Also, in addition to the above four additives, at least one selected from the group consisting of a benzophenone-based ultraviolet absorber and a benzotriazole-based ultraviolet absorber.
It has also been found that the addition of various UV absorbers can further improve weather resistance and soil stability. Therefore, the agricultural vinyl chloride resin film according to the present invention is very useful as an agricultural material.

Claims (2)

[Claims] Claims: 1. A 100 parts by weight of a vinyl chloride resin,
General formula (1) [In the general formula (1), R ¹ , R ² , R ³ and R ⁴ have 6 to 6 carbon atoms.
18 alkyl groups, cycloalkyl groups, phenylalkyl groups, aryl groups, and alkyl-substituted aryl groups] represented by the general formula (2): 2] And the general formula (3) [In the general formulas (2) and (3), R ⁵ , R ⁶ , and R
⁷ is an alkyl group having 4 to 22 carbon atoms, a cycloalkyl group,
A phenylalkyl group, an aryl group, an alkyl-substituted aryl group, and M represents zinc or calcium].
1 to 5 parts by weight, 0.1 to 10 parts by weight of an epoxy acrylate resin having an epoxy value of 0.01 or more and a weight average molecular weight of 2,000 or more, and 0.1 to 5 parts by weight of an antifogging agent. Agricultural PVC resin film. 2. The composition of the present invention contains 0.01 to 5 parts by weight of at least one ultraviolet absorber selected from the group consisting of a benzophenone ultraviolet absorber and a benzotriazole ultraviolet absorber per 100 parts by weight of a vinyl chloride resin. The agricultural polyvinyl chloride resin film according to claim 1, wherein: