JPS61270156A - Agricultural flexible vinyl chloride group resin film - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a flexible agricultural vinyl chloride resin film with excellent durability. The present invention relates to a durable agricultural soft vinyl chloride resin film that has excellent fogging properties and maintains these excellent properties for a long period of time.

"Conventional technology" In recent years, farmers cultivating useful plants have widely adopted methods of promoting or suppressing cultivation of useful plants in greenhouses or tunnels in order to improve profitability. became.

As a covering material for this house (greenhouse) or tunnel,
Polyethylene film, ethylene-vinyl acetate If,
A combination film, polyester film, polycarbonate film, vinyl chloride resin film, plus, etc. are used. Among them, soft vinyl chloride resin films have higher light transmittance and better light transmittance than other synthetic resin films.
It is widely used because it has the best overall properties such as heat retention, mechanical strength, durability, workability, and economic efficiency.

The properties required for a material used as a covering material for a house or tunnel are: ■ The outer surface does not become dirty for a long period of time, and has excellent dust resistance.
To maintain good light transmittance and promote r & calf of cultivated crops.

■ It has excellent anti-fogging properties, allowing condensed water adhering to the inner surface of the coating material to flow down along the inner surface of the film without falling onto the cultivated crops, keeping the inside of the greenhouse or tunnel at an appropriate level of humidity and preventing diseases. To suppress the occurrence of

etc.

On the other hand, based on conventional experience, the soft vinyl chloride resin film used for agricultural purposes is affected by the region and place where it is used, but after 3 years of use, the outer surface The dust resistance of the product deteriorates significantly, making it unusable.

In addition, after two summers (7 tanatsu, the second summer) have passed since the start of film expansion, the anti-fog properties of the inner surface decrease,
Subsequent use becomes difficult.

As a method to eliminate the above drawbacks,
Publication No. 0, Japanese Patent Publication No. 50-31195, Japanese Patent Application Publication No. 1983
As described in Japanese Patent Publication No. 99237, Japanese Patent Publication No. 56-99665, etc., there is a method of forming a coating of a specific acrylic resin on one or both sides of a vinyl chloride resin film as a substrate. Furthermore, JP-A-51-70282
The publication describes a method of forming a coating of an acrylic resin of a specific composition containing an ultraviolet absorber on the surface of a film of a substrate. However, since the coating formed on the base film in these methods is mainly made of thermoplastic resin, the additives contained in the base film may pass through the coating, especially during the summer when the outside temperature is high. It is difficult to completely prevent the film from migrating to the surface, being washed away, and disappearing, and there are still problems in using the film by stretching it outdoors for a long time.

Therefore, in order to further improve the above-mentioned drawbacks,
-53070 publication, Japanese Patent Application Laid-Open No. 57-70031,
As described in JP-A-57-163568 and the like, a method has been proposed in which at least one surface of a vinyl chloride resin film is coated with a cationic polymerizable energy ray curable resin composition. However, the epoxy resin composition preferably used as a cationically polymerized energy beam curable resin composition according to this method is susceptible to weather resistance deterioration in the film formed from it, and cannot fully achieve the intended purpose. There was a drawback.

In addition, Japanese Patent Publication No. 57-142359, Japanese Unexamined Patent Publication No. 5
8-29G64, etc., a vinylidene heptafluoride resin coating containing a large amount of ultraviolet absorber or an acrylic ester resin coating is formed on the surface to improve transparency, weather resistance, dust resistance, and strength. Agricultural soft vinyl chloride l? An S resin film is disclosed. However, such films have a drawback in that the adhesion of the film to the vinyl chloride resin film scraps on the substrate weakens during use due to the high content of ultraviolet absorber in the film, resulting in peeling. There is. Therefore, by reducing the content of ultraviolet absorber,
The weather resistance of the vinyl chloride-based 04 n'rt film layer deteriorates and discolors.

"Problems to be Solved by the Invention" Under such circumstances, the inventors of the present invention have found that the spreading work is easy to do, and the discoloration and embrittlement caused by spreading outdoors can be prevented.
As a result of extensive research, we aimed to provide an agricultural vinyl chloride resin film with improved durability and significantly improved undesirable deterioration phenomena such as a decrease in antifogging properties.
This has led to the completion of the present invention.

[Means for Solving the Problems] The gist of the present invention is that 1 to 10 parts by weight of a phosphate ester plasticizer is added to 100 parts by weight of vinyl chloride i-resin.
10 parts by weight, 0.5 to 7 parts by weight of epoxy compound, 0.1 to 3 parts by weight of ultraviolet absorber and/or 0.0 parts by weight of light stabilizer.
A dust-proof resin coating is formed on one side of a film formed from a resin composition having a weight of 5 to 3 layers via an adhesive layer containing acrylic acid ester type Q (fat), and on the remaining side, The present invention relates to a soft vinyl chloride resin film for agricultural use, which is characterized by forming an antifogging film.

The present invention will be explained in detail below.

In the present invention, the vinyl chloride resin includes not only polyvinyl chloride but also copolymers whose main component is vinyl chloride.

Examples of monomer compounds that can be copolymerized with vinyl chloride include vinylidene chloride, ethylene, propylene, acrylonitrile, maleic acid, itaconic acid, acrylic acid, methacrylic acid, and vinyl acetate. These vinyl chloride resins may be produced by any of conventionally known production methods such as emulsion polymerization, suspension polymerization, solution polymerization, and bulk polymerization.

The agricultural soft vinyl chloride resin film according to the present invention is
For 100 parts by weight of the base vinyl chloride resin, 7t'l of phosphate ester plastic is added as an essential component.
10 parts by weight, 0.5 to 7 parts by weight of an epoxy compound, and further 0.1 to 3 parts by weight of an ultraviolet absorber and/or 0.05 to 3 parts by weight of a light stabilizer. However, the ranges of the proportions of these ingredients are closely related to each other, and if the proportion of one ingredient is outside this range, the proportions of other ingredients must be within the above range. Even if there is, if you use this outdoors,
Defects such as discoloration and bleed-out due to exposure are observed, and the desired durability effect cannot be achieved.

Examples of the phosphoric acid ester plasticizer which is an essential component of the agricultural soft vinyl chloride US Ill'r film of the present invention include trioctyl phos-7ate, tri-7
Examples include enyl 7-osphate, tricresyl phos-7ate, tricylenyl 7-osphate, diphenyloctyl 7-osphate, nophenylcresyl phos-7ate, and triethylphenyl phos-7ate.

Examples of epoxy compounds include epoxidized oil, epoxidized linseed oil, epoxidized fish oil, epoxidized tall oil fatty acid ester, epoxidized tallow oil, epoxidized polybutanoene, epoxy methyl stearate, epoxy butyl stearate, 2-Ethylhexyl epoxy stearate, stearyl epoxy stearate, tris(epoxypropyl) in cyanurate, epoxidized castor oil, epoxidized wallflower oil, epoxidized 77 dioil fatty acid ester, 3-(2-xenoxy) -1゜2-
Epoxypropane, bisphenol-A1 diglycinolether, vinylcyclohexene dieboxide, 2,
Examples include polycondensates of 2-bis(4-hydroxyphenyl)propane and epichlorohydrin.

The usable ultraviolet absorbers are benzophenone ultraviolet absorbers and/or benzolyazole ultraviolet absorbers, and specific examples include the following.

Benzophenone ultraviolet absorber-1-2-hydroxy-4
-Nodoxybenzophenone, 2,4-nodoxybenzophenone, 2-hydroxy-4-〇-octoxybenzo7
2-hydroxy-4-methoxy-2°-carboxybenzophenone, 2,2'-dihydroxy-4,4
'-dimethoxybenzo7ene, 2-hydroxy-4-
Benzoyloxybenzophenone, 2,2゛-dihydroxy-4-methoxybenzophenone, 2-hydroxy-
4-Methoxy-5-sulfonebenzophenone, 2.2'
, 4.4'-tetrahydroxybenzophenone, 2.2
'-dihydroxy-4,4'-dimethoxybenzophenone, 2-hydroxy-5-chlorobenzophenone, bis-(2-methoxy-4-hydroxy-5-benzoylphenyl)methane.

benzo) iJ Azole external radiation absorber -2-(2'-hydroxyphenyl)benzotriazole,
'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-5'-methylphenyl)-5-carboxylic acid butyl ester benzotriazole, 2-(2'-hydroxy-51- methylphenyl)
-5,6-dichlorobenzotriazole, 2-(2'-
Hydroxy-5°-methylphenyl)-5-ethylsulfonebensotho+77zole, 2-(2°-hydroxy-
5'-t-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-5'-butylphenyl)benzotriazole, 2-(2'-hydroxy-5'-aminophenyl)benzotriazole 1.2-
(2'-hydroxy-3',51-tumethylphenyl)
Benzotriazole, 2-(2°-hydroxy-31,
5′-dimethylphenyl)-5-methoxybenzotriazole, 2-(2′-methyl-4′-hydroxyphenyl)penztriazole, 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'-not-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°-tsumethylphenyl)-5-carboxylic acid benzotriazole butyl Ester, 2-(2'-hydroxy-3', 5°-dichlorophenyl)benzotriazole, 2-(2'-hydroxy-4', 5'-dichlorophenyl)penztriazole, 2-(2'- Hydroxy-3°,5'-trimethylphenyl)-5-ethylsulfonebenzotriazole, 2-(2'-hydroxy-4'-octoxyphenyl)benzotriazole, 2-(2'-hydroxy-5'
-methoxyphenyl)-5-methylbenzotriazole, 2-(2'-hydroxy-5"-methylphenyl)-
5-carboxylic acid ester benzotriazole, 2-(2
°-acetoxy-5'-methylphenyl)benzotriazole.

Furthermore, as light stabilizers that can be used, the following general [(I)
In the formula, R1 to R1 are alkyl groups having 1 to 4 carbon atoms,
n is an integer of 1 to 4, R is a mono- to tetraacyl group derived from a mono- to tetravalent carboxylic acid, and refers to a hindered amine compound represented by the following formula.

The hindered amine compounds represented by the above formula (1) include 4-acetoxy-2=2.6.6-tetramethylpiperiqune, 4-stearoyloxy-2,2,6,
6-Tetramethylpiperiqune, 4-acryloyloxy-2,2,6,6-tetramethylpiperiqune, 4-(phenylacetoxy)-2゜2.6.6-tetramethylpiperiqune, 4- Cyx Tsukidiacetoxy)-2-2,G
, 6-tetramethylpiperiqune, 4-cyclohexamethyloxy-2゜2.6,6-tetramethylpiperiqune,
4-benzoyloxy-2,2,6,(3-tetramethylpiperiqune, 4-(o-chlorobenzoyloxy)-
2,2゜6.6-tetramethylpiperiqune, 4-(+-
chlorobenzoyloxy)-2,2,6,6-tetramethylpiperiqune, 4-(p-chlorobenzoyloxy)
-2,2,6,6-tetramethylpiperiqune, 4-(〇-toluoyloxy)-2,2,6,6-titramethylpipericine, 4-inicotinoyloxy-2゜2.6
．． 6-tetramethylpiperiqune, 4-(2-70yloxy)-2,2,6,6-tetramethylpiperiqune, 4
-(β-7toyloxy)-2,2゜6.6-titramethylpiverinone, bis(2,2,6゜6-tetramethyl-4-piperidyl)oxalate, bis(2,2,6
, 6-tetramethyl-4-piperinor)malonate, bis(2,2,6,6-tetramethyl-4-piperidyl)
Adipate, bis(2゜2.6.6-tetramethyl-4
-piperinor) sebacate, bis(2,2,6,6-tetramethyl-4-pivelinol)7malate, bis(2,
Tris(2,2,
6゜6-tetramethyl-4-piperidyl)benzene-1
, 3,5-tricarboxylate, Tris(2,2゜6
．． 6-tetramethyl-4-piperidyl)triazine-2
, 4,6-tricarboxylate, tris(2,2,6
, 6-tetramethyl-4-piperidyl)nitrilotriacetate, tris(2,2,6,6-tetramethyl-4
-piperidyl)butane-1,2,3-tricarboxylate, tetrakis(2,2,6,6-tetramethyl-4
-piperidyl)propane-1゜1.2.3-tetracarboxylate, tetrakis(2,2,6,6-tetramethyl-4-piperidyl)butane-1,2,3,4-tetracarboxylate, tetrakis( 2,2,6,6-tetramethyl-4-piperinor)propane-1,1,3,
3-tetracarboxylate, tetrakis (2,2,6
,6-tetramethyl-4-piperidyl)ethene-1.1
, 2.2-tetracarboxylate, tris(2,2,
6,6-tetramethyl-4-piperidyl)-2-7cetoxypropane-1.2.3-)recarboxylate, tris(2,2,6,6-tetramethyl-4-piperidyl)-2-hydroxy -propane-1,2,3-)licarboxylate and the like.

In order to impart flexibility to the agricultural soft vinyl chloride resin film according to the present invention, 20 to 60 parts by weight of a plasticizer is blended with 100 parts by weight of the base resin. When the amount of the plasticizer is within the above range, the target film can exhibit excellent flexibility and mechanical properties.

Examples of the plasticizers that can be used in the present invention include heptatalic acid derivatives such as di-n-cutyl heptatalate, di-2-ethylhexyl heptatalate, dibenzyl heptatarate, diisodecyl heptatarate, nododecyl heptatarate, and diisodecyl heptatalate. ; Iso-7 tar acid derivatives such as di-isooctyl heptalate; ') Adipic acid derivatives such as -n-butyl anobate and dioctyl anobate; di-n-
Examples include maleic acid derivatives such as butyl maleate; citric acid derivatives such as trilobyl citrate; itaconic acid derivatives such as monobutyl itaconate; olein Wl derivatives such as butyl oleate; and ricinoleic acid derivatives such as glycerin monolysyllate.

Other resin additives such as antioxidants, heat stabilizers, lubricants, pigments, dyes, etc. can be added to the base resin of the agricultural soft vinyl chloride resin film according to the present invention, if necessary.

Antioxidants that can be used include 2,6-tert
-butyl-4-/thylphenol, 2,2'-7tylenebis(6-tert-butyl-4-ethylphenol)
, dilaurylthionopropionate, and the like.

Examples of lubricants or heat stabilizers that can be used include polyethylene wax, liquid paraffin, stearic acid, zinc stearate, fatty alcohols, calcium stearate, barium stearate, barium ricinoleate, dibutyltin dilaurate, dibutyltin dilarate, and phenols. , β-nogaton compounds, and the like.

Examples of colorants that can be used include 7-taloshi 7-nin blue, 7-taloshi 7-in green, Hansa yellow, alizarin lake, titanium oxide, zinc white, permanent red, quinacudrin, and carbon black.

These resin additives can be used in a usual amount, for example, 5 parts by weight or less per 100 parts by weight of vinyl chloride P and resin.

In order to blend plasticizers, ultraviolet absorbers, hindered amine compounds as light stabilizers, and other resin additives into the base vinyl chloride resin, conventional blending and mixing techniques are used, such as Ebori pump blender 1 Banbury mixer. - A method using a supermixer or other compounding machine or mixer can be adopted.

The agricultural soft vinyl chloride resin film according to the present invention is
A dust-proof resin coating is formed on one side, and an anti-fog resin coating is formed on the remaining surface.

Therefore, the dust-proof resin coating is placed on the outside when the film is used in a house, etc., and at the same time suppresses various resin additives blended into the film from spewing out onto the outside surface. It functions to protect the surface of the film from deterioration caused by the environment. Further, the antifogging resin coating is placed on the inside and functions to suppress water droplets from adhering to the inside surface.

The dustproof resin coating is preferably one that has good adhesion to the soft vinyl chloride resin film of the base, and the coating derived from this has excellent flexibility and weather resistance. A resin containing fluorine atoms is suitable for a dust-proof resin coating having such properties, and specifically, a resin containing a polyvinylidene 7trate monopolymer and/or a monomer copolymerizable with vinylidene fluoride is suitable. Random, block, and graft copolymers, alternating copolymers of ethylene and 4-7 fluorinated ethylene, and mixtures of these and other synthetic resins that are compatible with each other can be mentioned.

0 containing the above fluorine atoms (if the fat is used in combination with other resins, it is
The proportion of fat determines dustproof performance, weather resistance, and light transmittance (transparency).
, which are selected in consideration of film forming processability, economic efficiency, etc., are used, but if the content is less than 20% by weight, the dustproof performance is insufficient, so it is preferable to have a content of more than 20% by weight. . The resin containing the seven-stranded atom contains ultraviolet absorbers and light stabilizers to improve the durability of the dustproof resin coating, as well as stabilizers and lubricants to improve moldability and processability. etc. can be added.

The dust-proof resin coating is made of 761 fat containing fluorine atoms.
Adhesion to the surface of a soft vinyl chloride resin film via an adhesive consisting of an acrylic ester compound containing at least 10% or more of methyl methacrylate and/or ethyl methacrylate. formed by The acrylic acid ester resin composition that forms this adhesive layer may contain other resins that are compatible with it,
For example, a resin containing a fluorine atom/or a vinyl chloride type (b) is preferably used in the form of a mixture with a fat.

The main constituent monomer of the acrylic acid ester resin is methyl acrylate, methyl methacrylate, ethyl methacrylate, etc., and among them, methyl methacrylate is preferred. In addition, the sub-constituent monomers include monomers copolymerizable with the main constituent monomers, such as acrylic esters, methacrylic esters, vinyl halides, vinylidene halides, aromatic vinyl compounds, and diene compounds. , olefin compounds, etc. Those monomers M
The form of the copolymer may be a random copolymer, a block copolymer, a graft copolymer, or the like.

The acrylic ester-based IIW composition contains an ultraviolet absorber and a light stabilizer in order to function as an adhesive for a long period of time and to further improve the durability of the underlying soft vinyl chloride resin film. It is desirable to use a pipericone compound as an agent in combination.

The antifogging resin coating formed on the remaining surface of the agricultural soft vinyl chloride resin film according to the present invention has good adhesion to the base soft vinyl chloride PS resin film, flexibility, hydrophilicity,
The antifogging resin coating having such properties is preferably one with high weather resistance, and is a paint coating containing an acrylic polymer containing 15 weight or more of a hydrophilic acrylic compound. Further, on the surface of the paint film, colloidal silica, V/or P such as alumina sol is applied.
& It is a coating coated with a hydrophilic paint containing as an active ingredient.

The above-mentioned acrylic polymer refers to an acrylic polymer containing 15% by weight or more, particularly preferably 50% by weight or more, of a hydrophilic acrylic compound. Hydrophilic acryl compounds include hydroxyalkyl (meth)acrylates.

This acrylic polymer! ! ! The hydroxyalkyl (meth)acrylates used in the production include hydroxymethyl (meth)acrylate, 2-hydroxyethyl (
7 cleant, 2-hydroxypropyl (meth)
Acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate,
Examples include 4-hydroxybutyl (meth)acrylate, 2-hydroxypentyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, and the like. These may be homopolymers or copolymers containing these hydroxyalkyl (meth)acrylates as a main component and other fumers that can be copolymerized with them.

This acrylic polymer is dissolved in an organic solvent to form a coating for forming an antifogging resin film (antifogging coating).

Organic solvents that can be used in this case include those that can be used in polymerization, such as methanol, ethanol, +1-propatol, i-propatol, n-butanol, 5e
e-butanol, Lcrt-butanol, n-pentanol, i-pentanol, terL-pentanol, n
-Hexanol, cyclohexanol, methyl acetate, methyl ethyl ketone, tetrahydro7rane, hexane, toluene, xylene, chloroform, etc. can be selected.

In order to increase the hydrophilicity of the antifogging paint made of the above-mentioned acrylic polymer, a hydrophilic paint containing inorganic colloidal silica and/or alumina sol as an active ingredient can also be applied to the surface. The colloidal silica sol/or alumina sol has an average particle size of 200 millimicrons or less. These may be used alone or in combination.

When combining both, it is recommended that the weight ratio of colloidal silica and alumina sol be 80 to 20/20 to 80 (total 100).The colloidal silica and/or alumina sol are:
In combination with water and surfactant, the solid content is 0.05~
It is preferable to use it in an amount of 10% by weight (1.00% by weight for the entire aqueous paint).

The alumina sol may be a commercially available product itself, or an aqueous sol obtained by dispersing commonly available alumina powder in water. When alumina sol is dispersed in water at a high concentration, it exhibits so-called thixotropy, in which the viscosity of the dispersion increases rapidly, making it difficult to obtain a homogeneous dispersion. Using this method, a homogeneous dispersion can be obtained. Furthermore, when colloidal silica is mixed into this dispersion, the viscosity of the dispersion can be lowered.

On the other hand, colloidal silica has a particle surface that is negatively charged in most cases, but in the present invention, it is not preferable to use one that is negatively charged. This is because the above-mentioned alumina sol has a positively charged particle surface, so when negatively charged colloidal silica and positively charged alumina sol are mixed, the mixed dispersion rapidly aggregates. This results in gelation and poor dispersion. Therefore, the colloidal silica preferably has a positively charged particle surface.

The surfactant used in combination with the above-mentioned paint containing colloidal silica sol/or alumina sol is preferably a nonionic surfactant, and specific examples include polyoxyethylene alkyl ethers, polyoxyethylene alkyl ethers, and polyoxyethylene alkyl ethers. Examples thereof include polyethers, polyoxine ethylene alkyl esters, sorbitan alkyl esters, polyoxyethylene sorbitan alkyl esters, fatty acid alkylolamides, and cellulose ethers. The proportion of these surfactants in the hydrophilic paint is 0.05 to 15% by weight (10% by weight for the entire hydrophilic paint).
It is preferable to set it as 0%.

In order to obtain the agricultural soft vinyl chloride U-oil film of the present invention which is a combination of the above-mentioned resin coatings, the following various laminating means are applied.

(1) A vinyl chloride resin composition is formed into a film by the calendar method or the Gui method, and an adhesive layer containing an acrylic acid ester resin is formed on one side of the film by solution coating or extrusion coating.
Then, a vinylidene heptafluoride resin coating is formed as a dust-proof oil coating by solution coating or extrusion coating. On the other hand, the other side of the vinyl chloride resin film is solution-coated with an acrylic resin film as an antifogging resin film, and if necessary, a hydrophilic paint containing colloidal silica/or alumina sol as an active ingredient is applied to the surface. Coating.

(2) The adhesive layer and the dust-proof resin film in the previous item (1) are formed separately or simultaneously, and then bonded to one side of a separately molded vinyl chloride resin film with the adhesive layer in between. Next, an antifogging resin film is formed on the other side by the same method as in the case of the previous item (1).

(3) Using a three-layer coextruder, the vinyl chloride resin composition, the resin for the adhesive layer, and the dust-proof lubricant composition are simultaneously extruded to form a film with a three-width structure, and then a vinyl chloride-based m1M film is produced. An antifogging resin coating is formed on one side of the substrate by the same method as in the previous section (1).

In addition, when extruding from an extruder and making a laminated film by the Gouy method, each of the resin compositions is prepared by mixing and dispersing the resin and additives uniformly in advance, melting the mixture by heating, kneading, and cooling. The method of crushing, pulverizing, and cutting into pellets may be carried out in accordance with known methods.

In the agricultural soft vinyl chloride resin film of the present invention, if the thickness of the base film is too thin, the strength will be insufficient. On the other hand, if it is too thick, it will cause inconvenience during film forming work and subsequent handling, so the thickness should be 0.03 to 0.3 m/
va range, preferably 0.075-0.25 m/
The range is preferably m.

Further, the thickness of the dustproof resin coating and the antifogging 1f resin coating can be selected within the range of 1/2 to 1/20 of the thickness of the base vinyl chloride resin film.

"Effects of the Invention" The agricultural soft vinyl chloride-based JLT film according to the present invention has the above-mentioned structure and has the following particularly remarkable effects, and its industrial utility value is It is extremely large.

(1) The agricultural soft vinyl chloride resin film according to the present invention has a durable coating that does not easily peel off on the surface of the film, so it is free from plasticizers and various resin additives added to the film. Transfer to the 72nd side of the film can be suppressed.

Therefore, the flexibility of the film can be maintained over a long period of time, and there is less dust adhesion to the film surface (especially the outside surface when used as a house or tunnel), and the dustproof effect lasts for a long time. .

(2) The agricultural soft vinyl chloride resin film according to the present invention has an antifogging resin coating formed on the remaining surface of the film, and this coating has excellent adhesion to the base film and has antifogging properties. The anti-fog effect lasts for a long time.

(3) Since the agricultural soft vinyl chloride resin film according to the present invention can be used for a long period of time as described above, the frequency of film replacement is reduced, the social problem of abandoned agricultural bifilm is alleviated, and savings are achieved. It becomes a resource and reduces the cost of installing agricultural and horticultural greenhouses.

“Examples” The present invention will be explained in detail based on Examples below.
The present invention is not limited to the following examples as long as essential points 11 are not exceeded.

Examples 1 to 4 and Comparative Examples 1 to 4 Preparation of vinyl chloride resin composition pellets Polyvinyl chloride (1-) = 1300) 100 parts DOP
Sol/Ba/Zni composite stabilizer 1.5 Step 7 Barium phosphate (stabilizer) 0.2 Zinc stearate (same as above) o, 4 Zinc organic phosphate salt *1 (same as above) Variable ultraviolet rays shown in Table 1 below Absorbent book? ``Light stabilizer*
3 Same as above Light stabilizer *4
A compound having the same Hanaki primary structure. However, R means an octadecyl group.

Wood 22,4 dihydroxybenzophenone
The mixture was kneaded using a Niegoo manufactured by SS) and extruded using an extruder at a temperature of 170'C to prepare pellets.

This is called Benz A.

Preparation of pellet for adhesive layer Eight types of vinyl chloride resin compositions consisting of the above components 80
For the overlapping part, each
20 parts by weight of acrylic resin (manufactured by Mitsubishi Rayon Co., Ltd., trade name) was added, mixed in a Henschel mixer, cooled, and kneaded in a Neeku manufactured by BUSS.
Extruded pellets were prepared in an extruder at temperature conditions of °C. This is called Benz B.

Preparation of dust-proof resin coated pellets For 100 heavy electric parts,
Tinuvin 327 (benzotriazole ultraviolet absorber,
1 part by weight (trade name, manufactured by Ciba Geigy) was added and mixed in a Henschel mixer, and then extruded using an extruder at a temperature of 230°C to prepare pellets. This is called Benz C.

Preparation of a coating agent for forming an antifogging resin film Nimethyl methacrylate 60 parts by weight Butyl methacrylate 30 Trimethylaminoethyl methacrylate base 10 Benzoyl peroxide 0.5" i-propyl
300 The components listed above were placed in a reactor and reacted at 80° C. for 7 hours under a nitrogen atmosphere. I-propertool is added to the obtained reaction product to form a coating agent made of acrylic Itlt resin with a solid content of 13 weight.

Manufacture of agricultural soft vinyl chloride resin film The above-mentioned A
, B and C pellets were melted and fed. In addition, Benz) A is extruded at 180″C using a 65φ extrusion die,
Benz) B is extruded at 180℃ using a 4oφ extrusion gouer, and Beret C is extruded at 230' using a 40φ extrusion goo.
A film consisting of three layers sandwiching a resin layer based on Benz) B was obtained by extrusion using a compound T die. This film in a molten state was placed in the close separation of a composite T-die and heated at 50°C.
The casting roll was held in a second place and cooled.
Subsequently, it was introduced onto a roll heated to 90"C, and the thickness of the A pellet-based layer (vinyl chloride resin film) was 90 μm, and the thickness of the B pellet-based layer (adhesive containing acrylic resin). A composite M!I film of 300% medium was obtained, in which the thickness of M (dust-proof resin coating made of vinylidene heptadide resin) based on C pellets was 5 μm.

Next, one side of the double N film (the side opposite to the side on which the dustproof resin coating made of vinylidene resin based on C pellets is formed) was coated with an antifogging film made of acrylic resin prepared by the method described above. A coating agent for forming a plastic film was applied by roll coating to a dry thickness of r1μ, and dried with hot air.

The agricultural soft vinyl chloride resin film obtained as described above was spread in a small open tunnel installed in Nagoya City, Aichi Prefecture from January 1980 to January 1986, and the presence or absence of discoloration due to outdoor exposure was investigated. Presence or absence of surface coating due to outdoor exposure;
The presence or absence of a decrease in dustproof property and antifogging effect, and light transmittance were examined.

The results are shown in Table 1.

Example 5 A coating liquid prepared by the following method was applied to the surface of the dustproof resin coating made of acrylic resin of the film of Example 1.

Preparation of a coating agent that imparts hydrophilicity to the surface of an antifogging resin coating Colloidal silica with a particle size of 10 to 1416μ 0.5 weight t1: part N
Colloidal silica with f particle diameter 70% 9016μ 0.5 Water-soluble methoxycellulose 0.1 Deionized water
100 Each of the above components was dispersed and mixed using a homogenizer to prepare a hydrophilicity-imparting coating agent.

The above coating solution was applied to the film of Example 1 by a roll coating method, dried by a hot air drying method, and applied at a solid content of 0.50 g/L112.

The obtained film was subjected to an evaluation test by outdoor exposure in the same manner as in Example 1.

The results are shown in Table 1.

From the results in 1- above, the following becomes clear.

(1) In the agricultural soft vinyl chloride fruit tree Im film according to the present invention, no rr# dew discoloration or peeling of the surface film was observed, and the transmittance did not decrease even after 2 years of spreading.

Further, no deterioration in dustproof property or antifogging property due to adhesion of water droplets was observed.

(2) On the other hand, the antifogging effect was achieved by changing the composition ratio in the base vinyl chloride resin film out of the range of the present invention (Comparative Examples 1 to 3) or by a method other than the present invention. The sample (Comparative Example 4) showed discoloration due to outdoor exposure, peeling of the surface film, and loss of antifogging effect.

Claims (5)

[Claims] (1) For 100 parts by weight of vinyl chloride resin, 1 to 10 parts by weight of phosphate plasticizer and 0.0 parts by weight of epoxy compound.
5 to 7 parts by weight, 0.1 to 3 parts by weight of ultraviolet absorber and/or
Alternatively, a dustproof resin coating is formed on one side of a film formed from a resin composition containing 0.05 to 3 parts by weight of a light stabilizer via an adhesive layer containing an acrylic acid ester resin, and the remaining A soft vinyl chloride resin film for agricultural use, comprising an antifogging resin coating formed on the surface of the film. (2) The agricultural soft vinyl chloride resin film according to claim (1), wherein the light stabilizer is a hindered amine compound. (3) Claim No. (1) characterized in that the dustproof resin coating contains a resin containing fluorine atoms.
Agricultural soft vinyl chloride resin film as described in . (4) The anti-fog resin coating contains 15% of the hydrophilic acrylic compound.
The agricultural soft vinyl chloride resin film according to claim (1), characterized in that it is made of an acrylic resin containing at least % by weight. (5) Agriculture according to claim (3), characterized in that the surface of the antifogging resin coating is coated with a hydrophilic paint containing colloidal silica and/or alumina sol as an active ingredient. Soft vinyl chloride resin film for use.