JP2000052496A - Agricultural synthetic resin film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the lasting properties of drip preventing properties in an agricultural synthetic resin film. SOLUTION: An agricultural synthetic resin film wherein the single surface of a synthetic resin base film is coated with coating containing a water absorbable resin is developed under tension so that the surface coated with the coating containing the water absorbing resin becomes the inner surface side of agricultural facilities such as an agricultural greenhouse. The water absorbing resin is a crosslinked polyalkylene oxide type water absorbing resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an agricultural synthetic resin film used as a covering material for agricultural facilities.

[0002]

2. Description of the Related Art Conventionally, transparent synthetic resin films have been used as covering materials for agricultural facilities such as agricultural houses and tunnels. As this synthetic resin film,
Consists of vinyl chloride resins such as polyvinyl chloride and ethylene-vinyl chloride copolymer resin, olefin resins such as polyethylene and ethylene-vinyl acetate copolymer resin, polyester resins such as polyethylene terephthalate, and synthetic resins such as fluorine resin. Films are commonly used,
Single-layer or multilayer vinyl chloride resin films and olefin resin films are widely used.

[0003]

However, in recent years, there has been a demand for a film which can be extended over a long period of time on the above-mentioned synthetic resin film for agriculture because of the labor shortage of farmers and resource saving. Have been. In addition, in order to be able to extend the agricultural synthetic resin film for a long period of time, the agricultural synthetic resin film having not only excellent weather resistance but also drip-proof properties is used. Are required to last for a long time.

[0004] As means for maintaining the drip-proof property for a long period of time, at least one surface of a base film is coated with a coating material in which a hydrophilic substance such as colloidal silica or colloidal alumina is mixed. There is known a method of extending the inside of an agricultural facility so as to be on the inner surface side.

However, when a large amount of colloidal silica or colloidal alumina is mixed with a coating material, the coating film obtained by applying the coating material to a base film is liable to be scratched by rubbing or the like, and in the worst case. In the case of (1), peeling of the coating film is also likely to occur. On the other hand, a coating film obtained by coating a base film with a coating material containing colloidal silica or the like added in a range in which this is unlikely to occur does not exhibit sufficient drip-proofness by itself, It was necessary to take measures such as adding a drip-proofing agent to the base film.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a coating film having not only a sufficient drip-proof property even if used alone, but also being less likely to be scratched by rubbing or the like. It is intended to provide an agricultural synthetic resin film formed with the above.

[0007]

Means for Solving the Problems The agricultural synthetic resin film of the present invention made to solve the above-mentioned problems is obtained by applying a paint containing a water-absorbent resin to one surface of a synthetic resin base film. It is characterized by the following. The agricultural synthetic resin film of the present invention is stretched such that the surface coated with a paint containing a water-absorbent resin is on the inner surface side of an agricultural facility such as an agricultural house.

The base film of the agricultural synthetic resin film of the present invention is a synthetic resin film conventionally used as an agricultural synthetic resin film, specifically, a vinyl chloride resin, an olefin resin, and a polyester. This is a film made of a synthetic resin such as a series resin or a fluorine resin. Among them, a film made of a vinyl chloride resin or an olefin resin is preferable. Of course, the base film may be a single-layer film or a multilayer film.

Examples of the above-mentioned vinyl chloride resin include polyvinyl chloride, which is a homopolymer of vinyl chloride, and vinyl chloride and other monomers such as vinylidene chloride, acrylonitrile, maleic acid, itaconic acid, acrylic acid, and methacrylic acid. Copolymer resins with acids, vinyl acetate, ethylene, propylene, maleic acid esters, acrylic acid esters, methacrylic acid esters, higher vinyl ethers, and the like, or mixtures thereof can be used.

The above-mentioned olefin resin includes polyethylene such as low-density polyethylene, linear low-density polyethylene, medium-density polyethylene and high-density polyethylene; ethylene-vinyl acetate copolymer resin, ethylene- (meth) acrylate copolymer Ethylene-based copolymer resins such as resins; olefin-based resins such as resins can be used. Particularly preferred are ethylene-vinyl acetate copolymer resins having a vinyl acetate content of 5 to 20% by weight, low-density polyethylene, and wires. At least one selected from the group consisting of low-density polyethylene. Further, when the base film is a film made of an olefin-based resin, it is preferable to use a multilayer film, rather than a single-layer film. It is desirable to form a multilayer film of two or more layers in which the layer made of the ethylene-vinyl acetate copolymer resin and the layer that forms the outer surface are made of low-density polyethylene and / or linear low-density polyethylene.

The synthetic resin constituting the base film includes:
If necessary, plasticizers, drip-proof agents, anti-fog agents, stabilizers, lubricants or anti-adhesives, ultraviolet absorbers, antioxidants, light stabilizers,
Various additives such as fillers (thermal insulation), coloring agents, etc., which have been conventionally used for agricultural synthetic resin films, are added.
The synthetic resin composition thus obtained is formed into a single-layer or multilayer film having a desired thickness by a known method such as a calendar method, an extrusion method, a coextrusion method, an inflation method, a coextrusion inflation method, or the like. , And a base film. The thickness of the base film is not particularly limited, but is usually about 0.05 to 0.2 mm.

As the above plasticizer, specifically, di-2-
Phthalate plasticizers such as ethylhexyl phthalate, di-n-octyl phthalate, diisononyl phthalate, butyl benzyl phthalate, diisodecyl phthalate, diundecyl phthalate; tricresyl phosphate, trixylyl phosphate, tris (isopropylphenyl) phosphate, tributyl phosphate ,
Triethyl phosphate, triphenyl phosphate,
Phosphate plasticizers such as triethylphenyl phosphate; epoxy plasticizers such as epoxidized soybean oil, epoxidized linseed oil, and epoxy resin; di-2-ethylhexyl adipate, di-2-ethylhexyl sebacate, and di-2- Fatty acid ester plasticizers such as ethylhexyl azelate; trimellitic acid ester plasticizers; polyester plasticizers such as polypropylene adipate; chlorinated paraffin; The above plasticizers can be used alone or in combination of two or more.
The amount of the plasticizer varies depending on the type of the synthetic resin constituting the base film, but in the case of a vinyl chloride-based resin, it is 20 to 7 per 100 parts by weight of the resin.
It is about 0 parts by weight.

Examples of the anti-drip agent include sorbitan fatty acid ester, sorbitol fatty acid ester, glycerin fatty acid ester, diglycerin fatty acid ester, sorbitan fatty acid / dibasic acid ester, sorbitol fatty acid / dibasic acid ester, glycerin fatty acid / dibasic acid ester, Ester of polyhydric alcohol and fatty acid such as diglycerin fatty acid and dibasic acid ester, ester of polyhydric alcohol and fatty acid and dibasic acid, or alkylene oxide such as ethylene oxide, propylene oxide and butylene oxide added to these Sorbitan palmitate, sorbitan stearate, sorbitan stearate / ethylene oxide 2 mol adduct, sorbitan stearate
Propylene oxide 3 mol adduct, sorbitol stearate, sorbitol stearate / ethylene oxide 3 mol adduct, diglycerin palmitate, diglycerin stearate, glycerin stearate, glycerin palmitate / ethylene oxide 2 mol adduct,
Sorbitan stearate adipate / ethylene oxide 3 mol adduct, sorbitol stearate adipate / ethylene oxide 2 mol adduct, diglycerin palmitate sebacate / propylene oxide 3 mol adduct, sorbitol palmitate adipate / ethylene oxide 3 mol adduct, etc. Is mentioned. These drip-proofing agents can be used alone or in combination of two or more.

Incidentally, in the agricultural synthetic resin film of the present invention, by forming a coating film as described below, sufficient drip-proof property can be imparted, and the drip-proof agent is added to the base film. Is not necessarily required, but this does not preclude adding a drip-proofing agent to the base film. In other words, the synergistic effect of the coating film and the drip-proofing agent added to the base film as described later makes it possible to obtain an agricultural synthetic resin film having excellent drip-proof properties for a long period of time. The amount of the drip-proofing agent added to the base film is about 0.5 to 5 parts by weight per 100 parts by weight of the resin.

As the antifog agent, a fluorine-containing compound having a fluorine-containing group and at least one of a hydroxyl group and an alkylene oxide group in one molecule can be used. The fluorinated group is a perfluoroalkyl group (C _n F
_{2n + 1} group), perfluoroalkoxy group (C _n F _{2n + 1} O)
Group), polyfluoroalkyl group (H _m C _n F
_{2n + 1 -m} group), perfluoroalkenyl group (C _n F
_2n-1 group), polyfluoroalkenyl group (H _m C _n F
_2n-1-m group), perfluoroalkylene group (C _n F _2n group)
(Where m is an integer of 1 to 3 and n is 3 to 2)
0) and the alkylene oxide group includes
(C ₂ H ₄ O) _n , (C ₃ H ₆ O) _{n and the} like (provided that
N in the formula is an integer of 1 to 30).

As the above-mentioned fluorine-containing compound, specifically,
Examples include those represented by formulas (1) to (13), but are not limited thereto.

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The above fluorine-containing compounds can be used alone or in combination of two or more. The amount of the fluorine-containing compound is 0.01 to 1.0 part by weight, preferably 0.05 to 1.0 part by weight, per 100 parts by weight of the resin.
0.5 parts by weight.

As the stabilizer, commonly used stabilizers such as metal soaps, organic phosphite stabilizers, and organic metal phosphate salts can be used. Metal soaps include zinc stearate, barium stearate, calcium stearate,
Examples include barium ricinoleate, calcium laurate, calcium oleate, zinc octoate, zinc benzoate, and the like. Examples of organic phosphite-based stabilizers include diphenyldecyl phosphite, triphenyl phosphite, tris (nonylphenyl) phosphite, Examples include tridecyl phosphite, tris (2-ethylhexyl) phosphite, tristearyl phosphite, octyl diphenyl phosphite, diphenyl acid phosphite, and dioctyl acid phosphite. As the metal organic phosphate, a compound represented by the general formula shown in Chemical formula 2 (a) or (b) can be used. Further, tin-based stabilizers other than the above, such as dibutyltin dilaurate, dibutyltin maleate, organic tin mercaptide, and organic tin sulfonamide;
Lead-based stabilizers such as tribasic lead sulfate, tribasic lead phosphite, and tribasic lead maleate can also be used. These stabilizers can be used alone or in combination of two or more. The amount of these stabilizers is 0.5 to 10 parts by weight, based on 100 parts by weight of the resin.
Preferably it is 1 to 5 parts by weight.

[0019]

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Examples of the lubricant or antiadhesive include fatty acid lubricants such as stearic acid, isostearic acid and palmitic acid; fatty acid amide lubricants such as stearic acid amide, methylene bisstearamide and ethylene bisstearamide; butyl palmitate And butyl stearate; ester lubricants such as barium isodecyl phosphate and calcium octadecyl phosphate; lubricants such as polyethylene wax and liquid paraffin. The above lubricants or antiadhesives can be used alone or in combination of two or more.

Examples of the ultraviolet absorber include commonly used ultraviolet absorbers such as benzophenone-based, benzotriazole-based, salicylate-based, and cyanoacrylate-based ultraviolet absorbers. These ultraviolet absorbents can be used alone or in combination of two or more.

As the light stabilizer, a commonly used light stabilizer such as a hindered amine compound can be used alone or in combination of two or more.

As the filler (heat insulating agent), one or more selected from calcium carbonate, silica, magnesium hydroxide, aluminum hydroxide, feldspar powder, talc, mica powder, hydrotalcites and the like can be used.

Further, the base film made of a synthetic resin used in the present invention contains an organic phosphate compound represented by the general formula as shown in Chemical Formula 3 in order to further improve weather resistance. You may.

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Further, in order to further improve the adhesion between the obtained synthetic resin base film and the coating film formed by the paint described below, the synthetic resin is added with 3 parts of polyoxyethylene.
It is desirable to add nonylphenyl ether to which 10 to 10 mol has been added. 3-10 of this polyoxyethylene
It is desirable that the addition amount of the nonylphenyl ether added by mole is about 0.01 to 0.7 parts by weight per 100 parts by weight of the resin.

The paint applied to the surface of the base film obtained as described above is based on a paint conventionally applied to a synthetic resin film for agricultural use, and is mixed with a water-absorbent resin. It is dispersed.

The base paint of the above-mentioned paint may be any of a solvent-based paint, a water-based paint and an ultraviolet-curable paint. However, in order to more effectively exhibit the drip-proof property, an aqueous paint is used. It is desirable. As the water-based paint, an acrylic, urethane-based, polyester-based, epoxy-based, or other water-based paint can be used. Among them, a paint mainly composed of a urethane resin emulsion is most preferable.

Examples of the water-absorbing resin mixed and dispersed in the base paint include starch-based water-absorbing resin, polyacrylate-based water-absorbing resin, starch-polyacrylate-based water-absorbing resin, and polyvinyl alcohol-based water-absorbing resin. Resin, polyvinyl alcohol-polyacrylate-based water-absorbent resin,
Known water-absorbing resins such as a polyacrylamide-based water-absorbing resin, a polyalkylene oxide-based water-absorbing resin, and a cellulose-based water-absorbing resin can be used, but a cross-linked polyalkylene oxide-based water-absorbing resin is preferable.

The amount of the water-absorbing resin to be mixed varies depending on the type of the water-absorbing resin used and the base paint, and cannot be unconditionally determined, but is not limited to 1 per 100 parts by weight of the active ingredient of the base paint. If the mixture is at least about parts by weight, sufficient drip-proof property is provided. That is, excellent drip-proof properties are provided with a significantly smaller mixing amount than conventionally used colloidal silica or the like. Also,
When a water-absorbent resin is used, even if it is added in a relatively large amount, it is unlikely that a problem such as scratching due to rubbing or the like easily occurs, so that the water-absorbing resin may be mixed to an extent that a desired drip-proof property can be imparted. However, if added more than necessary, there is a problem that the material cost is increased. Therefore, it is necessary to avoid adding more than necessary. On the other hand, conventionally used colloidal silica or the like does not provide sufficient drip-proof properties unless it is mixed in a remarkably large amount as compared with the water-absorbing resin, but when mixed in such a large amount, the coating with the paint is not possible. This causes a problem that the film is easily scratched.

When a water-based paint is used as the base paint, an emulsion of a hindered amine compound can be mixed in order to improve the weather resistance of the coating film itself. The mixing ratio of the hindered amine compound emulsion is 0.01 to 3 parts by weight per 100 parts by weight of the active components (components other than the components removed when the coating such as the dispersion medium is dried and solidified) of the base aqueous coating. It is desirable to use about parts by weight.

The paint used in the present invention includes:
In addition to the water-absorbing resin described above, colloidal silica and / or colloidal alumina, which has been mixed in paints conventionally used for imparting drip-proof properties to agricultural synthetic resin films, are used in combination. May be. This colloidal silica and colloidal alumina have an average particle size of 1 to 200.
nm. Colloidal silica, as the colloidal alumina, when the average particle size is used larger than the above range, the transparency of the resulting coating film is impaired, when using smaller than the above range, The stability of the paint may be impaired. In this case, the mixing amount of the colloidal silica and the colloidal alumina should be suppressed to an amount that does not cause a defect such that a coating film obtained by applying the coating material is easily scratched. It is.

Furthermore, a silicone-based surfactant can be added to the paint used in the present invention for the purpose of improving the wettability with a synthetic resin base film. As this silicon-based surfactant,
One or more types selected from a non-hydrolyzable siloxane-polyoxyalkylene block copolymer type silicone surfactant and a hydrolyzable siloxane-polyoxyalkylene block copolymer type silicon surfactant can be used. The amount of the silicone surfactant added is 0.0 to 100 parts by weight of the base paint (including the dispersion medium and the like).
It is desirable to use about 1 to 0.3 parts by weight.

As a method of applying the above-mentioned paint on the surface of the base film, known methods such as spray coating, roll coating, gravure coating, reverse roll coating, dip coating, screen printing, flexographic printing and the like are adopted. Yes, it is not particularly limited. The thickness of the coating film formed by applying the coating material is not particularly limited, but is usually in the range of about 0.5 to 5.0 μm.

The agricultural synthetic resin film of the present invention, on which a coating film made of the above-mentioned water-absorbing resin-containing paint is formed, is stretched such that the coating film forming surface is on the inner surface side of the agricultural facility. You.

The agricultural synthetic resin film of the present invention obtained as described above is provided with a dustproof property on the surface on which the coating film made of the paint containing the water-absorbing resin as described above is not provided. It is also possible to provide a coating film for the purpose. This dustproof coating film is formed by applying a coating material selected from a water-based coating material, a solvent-based coating material, an ultraviolet-curing coating material and the like, which has been conventionally used for forming this kind of coating film.

[0036]

The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. In particular, in the following examples, only an example in which the base film is a polyvinyl chloride film is shown. However, even if the base film is another film such as an olefin resin film, the same effect is exhibited. Things.

Examples 1 to 6 and Comparative Examples 1 to 4 A polyvinyl chloride composition having the composition shown in Table 1 was prepared by calendering a polyvinyl chloride base film A or B having a thickness of 0.1 mm. Obtained. On one side of the obtained base film,
Any paint selected from paints a to e shown in Table 2,
Using a gravure roll of 200 mesh, coating was performed so as to obtain the combination shown in Table 3, and dried at 90 ° C. for 1 minute to obtain an agricultural polyvinyl chloride film. The drip-proof property and the easiness of scratching of the obtained agricultural polyvinyl chloride film were evaluated by the following methods.

[Evaluation method] (1) Drip-proof property The obtained agricultural polyvinyl chloride film was treated with
After 12 months, the state of the inside surface of the house was visually observed after elongation in a tunnel house having a length of m, a height of 1 m, and a length of 10 m so that the coating surface became the inner surface.
The evaluation was performed on a five-point scale using the following criteria as a guide. <Criterion> 5: Adhesion of water droplets was hardly observed, and water was flowing in a film form. 4: Adhesion of water droplets is slightly observed, but water flows in a film form. 3: Adhesion of water droplets is observed, and there are portions where water flows in a streak shape. 2: There are many adhesions of water droplets, and the water flows in a streak shape. 1: Adhesion of water droplets was remarkable and hardly flowed. (2) Easiness of Scratch The presence or absence of a scratch when the coated surface of the obtained agricultural polyvinyl chloride film was rubbed with a nail was visually observed. ○: no scratch ×: scratch

[0039]

[Table 1]

[0040]

[Table 2]

[0041]

[Table 3]

[0042]

As described above, the agricultural synthetic resin film of the present invention is provided with excellent drip-proof property and has a long drip-proof property without adding a drip-proof agent to the base film. It lasts for a period of time, and scratches or the like due to rubbing or the like are unlikely to occur. Therefore, it is possible to extend it for a long time,
It is extremely useful from the viewpoint of labor saving and resource saving of agricultural work.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B05D 7/24 302 B05D 7/24 302R 4J002 302T 4J038 303 303B C08K 3/22 C08K 3/22 5/06 5 / 06 C08L 71/02 C08L 71/02 75/04 75/04 C09D 171/02 C09D 171/02 175/04 175/04 // C08J 7/04 CEZ C08J 7/04 CEZT F-term (reference) 2B024 DB01 DB07 EA01 2B029 EB01 EB16 EC09 EC16 EC20 4D075 CA02 CA10 CA34 CA36 DA04 DB31 EA06 EA13 EA21 EB31 EB38 EC02 EC03 EC07 EC35 4F006 AA12 AA16 AA17 AA35 AB03 AB20 AB24 AB32 AB34 AB35 AB37 AB65 A03 DA03 ABABAA03 BA02 AK01B AK15A AK51B AK54A AK54B AL05A BA02 CA02B CA18 CA18B CC00B EJ05B GB01 JB12B JD15B JM01B 4J002 AB042 BE 022 BG012 BG031 BG132 CD001 CF031 CH022 CK021 CP173 DE147 DJ017 EU076 EU086 FD086 FD202 FD313 GA01 GH01 HA07 4J038 DF022 DG001 GA15 HA446 KA09 MA14 NA08 NA10 PB02 PC08

Claims (8)

[Claims] An agricultural synthetic resin film obtained by applying a paint on at least one side of a base film made of a synthetic resin, wherein the base film is coated on an inner surface side of an agricultural facility when the base film is stretched. A synthetic resin film for agricultural use, wherein the paint to be applied is a paint containing a water-absorbing resin. 2. The agricultural synthetic resin film according to claim 1, wherein the water-absorbent resin is a crosslinked polyalkylene oxide-based water-absorbent resin. 3. The agricultural synthetic resin film according to claim 1, wherein the paint applied to the base film is a water-based paint. 4. The paint applied to the base film is a paint mainly composed of a urethane resin emulsion.
The agricultural synthetic resin film described in the above. 5. The agricultural synthetic resin film according to claim 3, wherein the paint applied to the base film is a paint obtained by mixing an emulsion of a hindered amine compound. 6. The agricultural composition according to claim 1, wherein the coating applied to the base film is a coating containing colloidal silica and / or colloidal alumina having an average particle size of 1 to 200 nm. Resin film. 7. The coating applied to the base film is a coating mixed with a silicone-based surfactant.
The agricultural synthetic resin film according to any one of the preceding claims. 8. The synthetic resin composition according to claim 1, wherein the base film comprises 0.01 to 0.7 parts by weight of nonylphenyl ether to which 3 to 10 mol of polyoxyethylene is added per 100 parts by weight of the synthetic resin. 7. The agricultural synthetic resin film according to any one of 7.