JPH0799842A - Film for agriculture - Google Patents

Abstract

PURPOSE:To prepare an agricultural film having decreased blocking tendency of the film without deteriorating light transmittance. CONSTITUTION:This film 10 for agricultural use is composed mainly of a vinyl chloride resin and has finely irregular parts 12 having fine irregularity and smooth parts 11 free from fine irregularity on one or both surfaces. The finely irregular part 12 and/or the smooth part 11 are discontinuously formed in the area of 1m wide along either one of the film edges and the ratio of the finely irregular part 12 is 10-90%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural film, and more particularly to an agricultural film which can reduce the adhesion between films without deteriorating the light transmittance.

[0002]

2. Description of the Related Art Conventionally, for example, a vinyl house is made by connecting iron or stainless steel pipes bent into a predetermined shape to form a skeleton, and a skylight or a doorway is provided at a predetermined position.
The surface is covered with a transparent vinyl chloride resin film.

In such a vinyl house, on a hot summer day, the sunshine is strong and the temperature inside the house becomes too high, so of course, not only opening the doorway, but also winding up the sides of the vinyl house in a roll shape. The room temperature is adjusted by pushing up the skylight and improving ventilation.

[0004]

By the way, since a general vinyl chloride resin film whose surface is easily sticky is used for the film covering the conventional vinyl house, for example, when the side surface is rolled up. The parts that were in contact with each other adhered to each other, and it took a lot of time and effort when winding up and rewinding.

Therefore, it has been proposed to prevent the films from adhering to each other by subjecting the entire surfaces of the films to a satin finish or adding inorganic fine powder to roughen the entire surfaces of the films. In such a film, the transmittance of sunlight required for the crops grown in the house is insufficient,
There was another problem that the original function of a vinyl greenhouse, where sunlight was introduced into the greenhouse for greenhouse cultivation, could not be fully fulfilled.

The present invention has been made against such a background of the prior art, and an object thereof is to provide an agricultural film which can reduce the adhesion of the film without deteriorating the transmittance of light rays.

[0007]

DISCLOSURE OF THE INVENTION The present invention is directed to an agricultural film containing a vinyl chloride resin as a main component and having on one or both sides fine irregularities provided with fine irregularities and non-fine irregularities having no fine irregularities. In the range of at least 1 m width along any one of the film edges, the fine irregularities and / or the non-fine irregularities are discontinuous, and the formation ratio of the fine irregularities is 10 to 90. %, And an agricultural film characterized in that fine irregularities are formed so as to be 10%.

Further, the above-mentioned fine concavo-convex portion is 500 to 60.
The average parallel light transmittance of the wavelength of 0 nm is 40% or less, the average total light transmittance of the light is 75% or more, and the non-fine concavo-convex portion having no fine concavo-convex portion has a parallel light average transmissivity of 60 at a wavelength of 500 to 600 nm. % Or more, and the average total light transmittance is preferably 80% or more.

[0009]

In the agricultural film of the present invention, since the fine irregularities provided with fine irregularities are formed so that the formation ratio is 10 to 90% within a range of 1 m width from at least one end of the film. , Even when the films are rolled up or stacked, it is possible to prevent the films from adhering to each other within a range of 1 m width from at least one end portion, and in the area having the fine unevenness portion, the non-fine unevenness portion having no fine unevenness is provided. By setting the content to 90 to 10%, it is possible to secure the translucency required for the agricultural film.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. In this example, an agricultural film for a greenhouse is taken as an example.

FIG. 1 is a partial plan view of an agricultural film of one embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view of the agricultural film of the embodiment. In FIG. An agricultural film whose main component is vinyl chloride resin. On one side of the film of the agricultural film 10, non-fine concavo-convex portions 11 extending obliquely straight and fine concavo-convex portions 12 of satin finish are alternately arranged at regular intervals.

As the vinyl chloride resin which is the main component of the agricultural film 10, in addition to polyvinyl chloride, monomers of vinyl chloride and other resins such as ethylene, propylene, vinylidene chloride, acrylonitrile, maleic acid,
Copolymer resin with itaconic acid, methacrylic acid, vinyl acetate, maleic acid ester, methacrylic acid alkyl ester such as methyl methacrylate, acrylic acid alkyl ester such as methyl acrylate, and higher vinyl ether,
Alternatively, blended products of these can be used.

0.5 to 6 parts by weight of the dripproofing agent may be added to 100 parts by weight of the vinyl chloride resin. If it is less than 0.5 part by weight, the drip-proof property is poor, while if it exceeds 6 parts by weight, it is not preferable because the amount of blistering on the film surface increases.

Examples of the antidrip 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, diglycerin fatty acid / dibasic acid. Esters, esters of polyhydric alcohols and fatty acids such as glycerin fatty acid and dibasic acid esters, esters of polyhydric alcohols and fatty acids and dibasic acids, or alkylene oxides such as ethylene oxide, propylene oxide and butylene oxide added to these And the like, specifically, sorbitan palmitate,
Sorbitan stearate, sorbitan stearate / ethylene oxide 2 mol adduct, sorbitan stearate / propylene oxide 3 mol adduct, sorbitol stearate, sorbitol stearate / ethylene oxide 3 mol adduct, diglycerin palmitate, 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 And a sorbitol palmitate adipate / ethylene oxide 3 mol adduct. These drip-proof agents can be used alone or in combination of two or more kinds.

The agricultural film of the present invention, together with this drip-proofing agent, has a content of 0.0 per 100 parts by weight of a vinyl chloride resin.
1 to 1.0 part by weight, preferably 0.05 to 0.5 part by weight of the fluorine-containing compound can be added.

The fluorine-containing compound is contained in one molecule.
A small amount of fluorine groups and hydroxyl groups or alkylene oxide groups
Fluorine-containing compound having at least one
As the group, a perfluoroalkyl group (C_nF
_{2n + 1}Group), perfluoroalkoxy group (C_nF_{2n + 1}O
Group), polyfluoroalkyl group (H_mC_nF
_{2n + 1-m}Group), perfluoroalkenyl group (C_nF
_2n-1Group), polyfluoroalkenyl group (H_mC_nF
_2n-1-mGroup), perfluoroalkylene group (C_nF_2nBasis)
Etc., where m = 1 to 3 and n = 3 to 20 are integers.
It As the alkylene oxide group, (C₂H_FourO)_n,
(C₃H_FourO)_nAnd n = 1 to 30 in the formula.

Specific examples of the fluorine-containing compound include C ₈ F
₁₇ C ₂ H ₄ O (C ₂ H ₄ O) ₈ CH ₃ , C ₈ F ₁₇ CH ₂ CH ₂ OHCH ₂ O (C ₂ H ₄ O) ₁₀ CH
₃ , C ₁₄ F ₂₁ CH ₂ CH (OCH ₃ ) CH ₂ O (C ₂ H ₄ O) ₁₀ CH ₃ , C ₁₄ F ₂₁ CH ₂ C
H (OH) CH ₂ O (C ₂ H ₆ O) ₁₀ H, C ₈ F ₁₇ CH ₂ CH (OCOH ₃ ) CH ₂ O (C ₃ H ₆ O)
₈ CH ₃ , C ₈ F ₁₇ SO ₂ N (C ₂ H ₅ ) (C ₂ H ₄ O) ₁₂ , C ₆ F ₁₃ CON (C ₂ H ₅ ) (C ₂ H
₄ O) ₈ H, C ₈ F ₁₇ SO ₂ N [CH ₂ CH (OH) CH ₂ CH] ₂ , HCF ₂ C ₅ F ₁₀ CH ₂ O
(C ₂ H ₄ O) ₁₀ H, C ₃ F ₇ OC ₃ F ₆ CH ₂ CH ₂ SCH (COOH) CH ₂ COO (C ₂ H ₄ O)
₁₀ H, C ₃ F ₇ OC ₃ F ₁₀ CH ₂ CH ₂ SCH (CH ₂ COOH) CH ₂ COO (C ₂ H ₄ O)
₁₅ H, However, the present invention is not limited to these.

If necessary, a plasticizer, a stabilizer, a lubricant or an anti-adhesive agent, an ultraviolet absorber, an antioxidant, a light stabilizer, an inorganic filler, etc. may be added to the agricultural film of the present invention. You can As the plasticizer added to the vinyl chloride resin, a general plasticizer, a phosphoric acid ester plasticizer,
Epoxy plasticizers can be used.

As the general plasticizer, di-n-octyl phthalate, di-2-ethylhexyl phthalate, diisononyl phthalate, dibutyl phthalate, butylbenzyl phthalate, dilauryl phthalate, didecyl phthalate, diunadecyl phthalate, ditridecyl phthalate, etc. In addition to adipic ester plasticizers such as phthalate plasticizers, dioctyl adipate, ditrinonyl adipate, and diisodecyl adipate, polyester plasticizers, sebacic acid plasticizers, trimellitic acid plasticizers, and the like can also be used.

As the phosphate ester type plasticizer, tricresyl phosphate, trixylyl phosphate, tris (isopropylphenyl) phosphate, tributyl phosphate, triethyl phosphate, triphenyl phosphate, triethylphenyl phosphate and the like can be used.

As the epoxy plasticizer, epoxidized vegetable oil and epoxy resin can be used. Epoxidized soybean oil, epoxidized linseed oil and the like can be used as the epoxidized vegetable oil.

As the epoxy resin, epoxidized polybutadiene, epoxy methyl stearate, butyl epoxy stearate, ethylhexyl epoxy stearate, tris (epoxypropyl) isocyanurate, 3
-(2-xenoxy) -1,2-epoxypropane, bisphenol A, diglycidyl ether, vinyldicyclohexene diepoxy side, and polycondensation product of 2,2-bis (4-hydroxyphenyl) propane and epichlorohydrin are mentioned. The above-mentioned plasticizers may be used alone or in combination of two or more, and the preferable addition amount is 30 to 70 parts by weight of a phthalate ester-based plasticizer and 100 parts by weight of a vinyl chloride-based resin, a phosphate ester-based plasticizer 1 to 7 parts by weight and 0.5 to 7 parts by weight of epoxy plasticizer.

As the stabilizer, commonly used stabilizers such as metal soap and organic phosphite stabilizer can be used. Examples of the metal soap include zinc stearate, barium stearate, calcium stearate, barium ricinoleate, calcium laurate, calcium oleate, zinc octoinate and the like.

Examples of the organic phosphite stabilizer include diphenyldecylphosphite, triphenylphosphite, tris (nonylphenyl) phosphite, tridecylphosphite, tris (2-ethylhexyl) phosphite, tristearylphosphite, octyl. Examples include diphenyl phosphite. These stabilizers may be used either individually or in combination of two or more.

As the lubricant or anti-tacking agent, fatty acid-based lubricants such as stearic acid, isostearic acid and palmitic acid, fatty acid amide-based lubricants such as stearic acid amide, methylene bis stearamide and ethylene bis stearoamide, butyl palmitate. , Ester lubricants such as butyl stearate, organophosphate metal salt lubricants such as barium isodecyl phosphate, calcium octadecyl phosphate, polyethylene wax, liquid paraffin, etc., and one or more of them may be used. it can.

Examples of the UV absorber include benzophenone-based, benzotriazole-based, salicylate-based, and cyanoacrylate-based UV absorbers which are generally used, and one or more of these can be used. .

As the antioxidant, one kind or two or more kinds of antioxidants such as phenol type, thiodipropionate type and aliphatic sulfide type can be used.
As the light stabilizer, one or more commonly used light stabilizers such as hindered amines can be used.

The inorganic fine powder can be used for the purpose of preventing stickiness of the film surface and improving heat retention. As such an inorganic fine powder, at least one kind of magnesium carbonate, magnesium silicate, silicon oxide, aluminum oxide, aluminum hydroxide, magnesium hydroxide and hydrotalcites can be used. The diameter is preferably 20 μm or less.

The fine unevenness portion 12 formed on the film of the agricultural film 10 has fine unevenness formed on one surface of the film by embossing or the like. The fine irregularities are
It may be formed on both sides of the film. Further, the fine unevenness portion 12 has a parallel light ray average transmittance of 40% or less and a total light ray average transmittance of 75% at a wavelength of 500 to 600 nm.
The above values are preferable, and the average parallel light transmittance of this embodiment is about 7% and the average total light transmittance is about 80%. By setting the average light transmittance of the fine concavo-convex portion 12 as described above, the light transmittance of the entire film becomes good, and the environment in the house can be made more suitable for the growth of crops.

The formation ratio of the fine concavo-convex portion 12 is 10 to 9 within a range of 1 m width from at least one end of the film.
It is 0%, preferably 20 to 70%. In this embodiment,
The fine concavo-convex portion 12 is formed substantially uniformly on the entire surface of the film, and the formation ratio is about 25%. If the formation ratio of the fine concavo-convex portion 12 is too high, the light transmission required for the agricultural film cannot be secured, which may adversely affect the growth of the crop. Conversely, if the formation ratio of the fine concavo-convex portion 12 is too low. , The films stick to each other, making it difficult to wind them.

Further, the fine concavo-convex portion 12 has the fine concavo-convex portion 1.
It is important that at least one of the two or the non-fine concavo-convex portion 11 not provided with fine concavities and convexities is discontinuous. For example, even if fine concavities and convexities are provided in the entire area within a width of 80 cm from one end and the other portions are non-fine concavo-convex portions 11, the formation ratio of the fine concavo-convex portions 12 is within a range of 1 m width from at least one end of the film. It will be in the range of 10 to 90%, but in this way, since there is a part where the transmittance of sunlight is lower in the house compared to other parts, it adversely affects the growth of the crop cultivated in that part. Exert. Therefore, the fine concavo-convex portion 12 is selected at an arbitrary position within a range of 1 m width from at least one end of the film, as in the present embodiment.
It is preferable that the formation ratio falls within the range of 10 to 90% at any position within the m-square and the fine uneven portions 12 and the non-fine uneven portions 11 are substantially uniformly dispersed.

The non-fine concavo-convex portion 11 not provided with fine concavities and convexities is preferably 10% or more, more preferably 30% or more of the entire surface of the film. In this example, it is about 75% of the total surface of the film. If the formation ratio of the non-fine concavo-convex portion 11 is small, sufficient light transmission cannot be obtained, which adversely affects the growth of the cultivated crop.
Further, the non-fine concavo-convex portion 11 preferably has an average transmittance of parallel rays of a wavelength of 500 to 600 nm of 60% or more and an average transmittance of all rays of 80% or more. Is about 85% and the average transmittance of all rays is about 90%. By doing this, the light transmission of the film as a whole becomes good, making the environment inside the house more suitable for the growth of crops, and the state inside and outside the house can be discriminated through the film, improving the efficiency of agricultural work. Leads to.

In this embodiment, the fine concavo-convex portions 12 and the non-fine concavo-convex portions 11 are alternately arranged in a diagonal stripe shape, but the present invention is not limited to this, and a range of at least 1 m width from at least one end of the film. Inside, the fine uneven portion 12 provided with fine unevenness
If the formation ratio is 10 to 90% and at least one of the fine uneven portion 12 and the non-fine uneven portion 11 is discontinuous, any arrangement may be adopted, for example, the fine uneven portion 1
2 or the non-fine concavo-convex portion 11 may be arranged vertically or horizontally in a stripe shape, a lattice shape, or a polka dot shape.

Further, in the present embodiment, the entire surface of the film is used as the formation region of the fine irregularities 12, but the agricultural film of the present invention does not necessarily have the entire surface of the fine irregularities 12.
It is not necessary to form the region for forming the film, and if the region within 1 m width from at least one end of the film is the region for forming the fine irregularities 12 described above, the film can be rolled up without deteriorating the light transmittance which is the object of the present invention. It is possible to obtain an agricultural film that is easy to work on. It should be noted that the state other than the formation region of the fine concavo-convex portion 12 may be in any state, for example, the fine concavo-convex may be provided over the entire area,
It is not necessary to provide fine irregularities at all, but in order to transmit a sufficient light beam, the fine irregularities are not provided over the entire area, or the fine irregularities 12 and the non-fine irregularities 1 as in the present embodiment.
It is desirable to provide fine unevenness so that 1 is mixed.

In the use of the agricultural film of this example, the vinyl house skeleton (not shown) is covered from the outside,
In addition, the fine concavo-convex portion 12 is attached so that the formation region becomes the portion to be rolled up. In this way, the agricultural film 10 which covers the sides of the greenhouse in order to improve ventilation in the greenhouse, for example, on a day with strong sunlight in summer.
If you wind up the outside of the
However, it is wound up on the surface of the non-fine concavo-convex portion 11 which is easily adhered in a point adhesive state. Since such point adhesion is easier to peel off than surface adhesion, when the film 10 is rewound to close the opened side surface of the vinyl house, the films can be smoothly rewound without sticking to each other. .
The same applies when the agricultural film of the present invention is used for a skylight of a vinyl house.

Although the embodiment of the present invention has been specifically described above, the present invention is not limited to this embodiment, and even if there are design changes and the like without departing from the scope of the invention, the present invention is included in the present invention. Be done. For example, the agricultural film of the present invention can be applied not only as an exterior material for vinyl houses but also as curtains, tunnels, and the like.

[0037]

Industrial Applicability As described above, the agricultural film of the present invention has a formation ratio of the fine irregularities having the fine irregularities of 10 to 9 within the range of 1 m width from at least one end of the film.
Since the fine uneven portion is 0% and at least one of the fine uneven portion 12 and the non-fine uneven portion 11 is discontinuous, when the films are rolled up or stacked, the films adhere to each other. It is possible to work smoothly when the film is rewound or peeled off when the films are rewound or peeled when they come into contact with each other in a difficult point adhesion state, and the light transmission required for a vinyl house or the like is sufficiently secured.

Further, the fine irregularities have a thickness of 500 to 600 nm.
The average parallel light transmittance of the wavelength is 40% or less, the average total light transmittance of 75% or more, and the non-fine unevenness portion is 500 to 60.
By setting the parallel light average transmittance of 0 nm wavelength to 60% or more and the total light average transmittance of 80% or more, the light transmittance of the film as a whole becomes better, and the environment in the house is more suitable for the growth of crops. It is possible to distinguish between the inside and outside of the house through the film, which leads to the efficiency of agricultural work.

[Brief description of drawings]

FIG. 1 is a plan view of an agricultural film according to an embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of an agricultural film of an example.

[Explanation of symbols]

 10 Agricultural film 11 Non-fine irregularities 12 Fine irregularities

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B32B 27/30 101 8115-4F

Claims (2)

[Claims] 1. An agricultural film comprising a vinyl chloride resin as a main component, and having fine irregularities with fine irregularities and non-fine irregularities without fine irregularities on one or both sides, at least a film edge portion. 1 along any one of
Within the range of m width, the fine concavo-convex portion and / or the non-fine concavo-convex portion is discontinuous, and the formation ratio of the fine concavo-convex portion is 1
A film for agriculture, characterized in that fine irregularities are formed so as to be 0 to 90%. 2. An average parallel light transmittance of the fine uneven portion of a wavelength of 500 to 600 nm of 40% or less, an average total light transmittance of 75% or more, and a non-fine uneven portion of the parallel light average of a wavelength of 500 to 600 nm. The agricultural film according to claim 1, which has a transmittance of 60% or more and an average total light transmittance of 80% or more.