JP3148164B2 - Agricultural synthetic resin film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural synthetic resin film used in agricultural facilities.

[0002]

2. Description of the Related Art Conventionally, transparent synthetic resin films have been used as covering materials for agricultural houses and tunnels. Examples of the synthetic resin film include polyvinyl chloride resins such as polyvinyl chloride and ethylene-vinyl chloride copolymer resin, olefin resins such as polyethylene and ethylene-vinyl acetate copolymer resin, polyethylene terephthalate, and fluorine resin. Resin films are generally used, and among them, single-layer or multi-layer vinyl chloride resin films and olefin resin films are widely used.

[0003]

The above-mentioned agricultural synthetic resin film is required to have such properties as not to impede the transmission of light necessary for growing crops. That is, not only the transparency of the film itself is improved as much as possible, but also there is no possibility that dust or dirt adheres to the film to impair the transparency during use (generally referred to as dustproofness). Water droplets do not adhere to the inner surface when it is spread and become cloudy (generally referred to as anti-fogging or drip-proof), and do not generate fog inside the expanded house etc. There is no need for such properties (generally referred to as anti-fog properties).

Incidentally, a vinyl chloride resin film widely used as a synthetic resin film for agriculture is more susceptible to dust and dirt than an olefin resin film or the like, and the transparency is impaired (that is, the dustproof property). Inferior). Therefore, means such as forming a coating film of a paint such as an acrylic paint on the film surface is employed.

[0005] However, in the case where a coating film made of an acrylic paint or the like is formed as described above, dust-proofing properties can be improved to some extent, but are still not sufficient, and further improvements have been desired.

The present invention has been made to solve the above problems, and has as its object to provide an agricultural synthetic resin film having improved dustproofness without lowering the transparency of the film itself. Things.

[0007]

Means for Solving the Problems The agricultural synthetic resin film of the present invention which has been made to solve the above-mentioned problems is an agricultural synthetic resin film in which a paint film is formed on at least one side of a synthetic resin base film. In the synthetic resin film, the paint is a paint obtained by adding 0.2 to 10 parts by weight of silicon resin fine particles per 100 parts by weight of a resin solid content. That is, the present invention has improved dustproofness by forming a coating film of a coating material to which the above-mentioned silicon resin fine particles are added, even in the case of a vinyl chloride resin film which is easily tacky. Further, even if a coating film formed of a paint to which the above-mentioned silicon resin fine particles are added is formed, the transparency of the film itself is not impaired, and therefore, the agricultural synthetic resin film of the present invention is a conventional acrylic paint or the like. There is no particular difference in transparency when compared with an agricultural synthetic resin film having a coating film formed thereon or an agricultural synthetic resin film having no coating film.

The base film of the agricultural synthetic resin film of the present invention is a film conventionally used as an agricultural synthetic resin film, specifically, a vinyl chloride resin, an olefin resin, a polyethylene terephthalate, a fluorine-based resin. It is a film made of a synthetic resin such as a 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.

The most significant use of the structure of the present invention is based on a vinyl chloride resin film as a base film, but a film made of a synthetic resin other than a vinyl chloride resin is used as a base film. Even in the case of, there is no problem in adopting the configuration of the present invention described above, and the effects expected by the present invention are sufficiently exhibited.

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.

Examples of the olefin resin include polyethylene such as low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene; ethylene-vinyl acetate copolymer resin, and 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. When the base film is a film made of an olefin-based resin, a multilayer film is more preferable than a single-layer film. A layer consisting of
A multilayer film of two or more layers in which the outer layer is made of low-density polyethylene and / or linear low-density polyethylene is desirable.

The synthetic resin constituting the base film may contain, if necessary, a plasticizer, a drip-proof agent, an anti-fog agent, a stabilizer, a lubricant or an anti-adhesive, an ultraviolet absorber, an antioxidant, and a light stabilizer. A synthetic resin composition is prepared by adding various additives such as an agent, a warming agent, and a colorant, and is formed into a film having a desired thickness by a known means such as a calender method, an extrusion method, and an inflation method.

Specific examples of the plasticizer include phthalate plasticizers such as di-2-ethylhexyl phthalate, diisononyl phthalate, butylbenzyl phthalate, diisodecyl phthalate, and diundecyl phthalate; tricresyl phosphate, trixylyl phosphate, and tris Phosphate plasticizers such as (isopropylphenyl) phosphate, tributyl phosphate, triethyl phosphate, triphenyl phosphate, triethylphenyl phosphate; epoxy plasticizers such as epoxidized soybean oil, epoxidized linseed oil, and epoxy resin;
Fatty acid ester plasticizers such as 2-ethylhexyl adipate, di-2-ethylhexyl sebacate, di-2-ethylhexyl azelate; trimellitic acid ester plasticizers; polyester plasticizers such as polypropylene adipate; chlorinated paraffin; Is mentioned. 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 is about 20 to 70 parts by weight per 100 parts by weight of the vinyl chloride resin.

Specific 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 ester.
Ester of polyhydric alcohol and fatty acid, ester of polyhydric alcohol and fatty acid and dibasic acid, such as dibasic acid ester, glycerin fatty acid / dibasic acid ester, diglycerin fatty acid / dibasic acid ester, or ethylene Oxides, propylene oxide, compounds to which an alkylene oxide such as butylene oxide has been added, 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 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. The amount of the above drip-proofing agent is about 0.5 to 5 parts by weight per 100 parts by weight of the resin.

[0015] As the antifog, a fluorine group in one molecule,
A fluorine-containing compound having at least one of a hydroxyl group and an alkylene oxide group can be used. Fluorine group, a perfluoroalkyl group _{(C n F 2n + 1 -} ), perfluoroalkoxy group _{(C n F 2n + 1 O-} ), polyfluoroalkyl group _{(H m C n F 2n +} 1-m -) , perfluoroalkenyl group _{(C n F 2n-1 -} ), polyfluoroalkenyl group _{(H m C n F 2n-} 1-m -), perfluoroalkylene group (C _n F _2n -) and the like (provided that, m is an integer of 1 to 3 in the formula, n 3-20 integer), also alkylene oxide groups, _{[- (C 2 H 4 O)} n - ], [- (C ₃ H ₆ O)
_n- ] and the like (where n is an integer of 1 to 30).

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

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The above-mentioned fluorine-containing compounds may be used alone or in combination of two or more. Further, the addition amount of the fluorine-containing compound is 0.0
It is 1 to 1.0 part by weight, preferably 0.05 to 0.5 part by weight.

As the stabilizer, a commonly used stabilizer such as a metal soap, an organic phosphite-based stabilizer, and an organic metal phosphate compound can be used. Metal soaps include zinc stearate, barium stearate, calcium stearate, barium ricinoleate, calcium laurate,
Examples include calcium oleate and zinc octoate. Examples of the organic phosphite-based stabilizer include diphenyldecyl phosphite, triphenyl phosphite, tris (nonylphenyl) phosphite, tridecyl phosphite, and tris (2-ethylhexyl). Examples include phosphite, tristearyl phosphite, octyl diphenyl phosphite, diphenyl acid phosphite, dioctyl acid phosphite, and the like. As the metal organic phosphate, those represented by the following chemical formula (a) or (b) can be used. Other than the above, dibutyltin dilaurate, dibutyltin maleate, organic tin mercaptide,
Tin-based stabilizers such as organic tin sulfonamides, tribasic lead sulfate, tribasic lead phosphite, and tribasic lead maleate can also be used. The above 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, preferably 1 to 5 parts by weight, based on 100 parts by weight of the resin.

[0019]

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Examples of the lubricant or anti-adhesive include fatty acid lubricants such as stearic acid, isostearic acid and palmitic acid, fatty acid amide lubricants such as stearamide, methylenebisstearamide and ethylenebisstearamide, butyl palmitate And lubricants such as butyl stearate and the like, ester lubricants such as barium isodecyl phosphate and calcium octadecyl phosphate, polyethylene wax, liquid paraffin and the like. The above lubricants or antiadhesives may 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. The above ultraviolet absorbers 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 heat insulator, conventionally used fine particles having absorption in the infrared region can be used.
Specifically, it is at least one selected from hydrotalcites, silica, magnesium hydroxide, aluminum hydroxide, talc and the like.

As described above, the base film made of the synthetic resin of the present invention is obtained by adding an inorganic or organic filler to the synthetic resin composition constituting the film and roughening the film surface. Is also good. As inorganic fillers,
One or more inorganic fillers selected from magnesium carbonate, magnesium silicate, silica, aluminum oxide, aluminum hydroxide, magnesium hydroxide, hydrotalcites and the like can be used. As the organic filler, synthetic resin particles such as crosslinked vinyl chloride resin particles can be used. As these fillers, it is desirable to select and use those that do not impair the transparency of the base film as much as possible, and the addition amount thereof is also added in a range that does not impair the transparency of the base film as much as possible. It is desirable.

Further, the base film made of the synthetic resin of the present invention may be one in which embossed squeezing such as satin or silk is formed on the entire surface or a part thereof. This embossed aperture may be formed on both sides of the film, but in general,
An embossed aperture is formed on one side, and a coating film to be described later is formed on the side on which the embossed aperture is not formed.

The emboss stop may be formed over the entire predetermined range (the range in which the emboss stop is to be formed). However, if the emboss stop is formed in this manner, the light transmittance of that portion will be reduced. In the case where it is necessary to ensure the light transmittance as much as possible, the emboss stop is not formed in the entire predetermined range, but a portion where the emboss stop is not formed (that is, a transparent portion) remains in the predetermined range. It is desirable that the portion where the embossed aperture is formed has a pattern.
At this time, the shape of the portion where the embossed aperture is formed is vertical, horizontal, diagonal stripes (including wavy stripes, etc.)
It is preferable that the portion where the embossed iris is not formed is substantially uniformly dispersed, such as a polka dot pattern (including a polka dot-shaped portion where the embossed iris is not formed). In addition, it is desirable that the ratio of the area occupied by the portion where the embossed aperture is formed in the above-mentioned predetermined portion is about 20 to 70%.

The coating applied to at least one surface of the base film is any coating that has been conventionally used for forming a coating film on the surface of a synthetic agricultural resin film. Also, any of a solvent type, an aqueous type and an ultraviolet curable type can be used. As a specific example, an acrylic polymer obtained by polymerizing one or more monomers selected from acrylic acid esters and methacrylic acid esters, or monomers copolymerizable with these monomers, is used as a resin solid component. Acrylic paints and the like. Further, for example, as the acrylic polymer, a polymer having a functional group such as a hydroxyl group or a carboxyl group is used, and a polyfunctional compound having two or more functional groups reactive with this functional group in a paint ( By adding a polyfunctional isocyanate compound or its derivative, etc.), a cross-linkable paint such as a paint in which these form a cross-linked structure may be used. Furthermore, the above-mentioned paint may contain various additives conventionally added to the paint as needed.

[0028] Fine particles of silicone resin are added to the above-mentioned paint. It is desirable to use spherical particles as the silicon resin fine particles. In addition, even if inorganic fine particles such as silica or synthetic resin fine particles other than silicon resin are added in place of the above-mentioned silicon resin fine particles in the coating material, the effect is not as great as that obtained by adding silicon resin fine particles. When inorganic particles such as silica and the like are added, the transparency of the coating film may decrease.

The silicon resin particles preferably have an average particle diameter of 0.2 to 10 μm, particularly 3 to 8 μm. If the average particle size of the silicon resin fine particles is too small, the desired effect of the present invention will not be sufficiently exhibited, and if the average particle size of the silicon resin fine particles is too large, the transparency of the coating film will be impaired, Problems such as the tendency of silicon resin particles to fall off from the film and the problem that silicon resin particles are not uniformly dispersed in the coating material occur. The addition amount of the silicon resin fine particles is 0.2 to 10 parts by weight per 100 parts by weight of the resin solid content of the paint. If the addition amount of the silicon resin fine particles is less than the above range, the object of the present invention cannot be sufficiently achieved, and even if the addition amount of the silicon resin fine particles is added beyond the above range, cost increases. In addition to this, there are adverse effects such as difficulty in uniformly coating the paint.

The coating method of the paint to which the silicon resin fine particles are added includes spray coating, roll coating, gravure coating, reverse roll coating, dip coating,
Known methods such as screen printing and flexographic printing can be adopted, and there is no particular limitation.

The thickness of the coating film formed by applying the coating material is not particularly limited. However, when the thickness is significantly larger than the average particle size of the added silicon resin fine particles, the coating of the added silicon resin fine particles may be performed. The burial in the film is increased, and as a result, the effect of adding the silicon resin fine particles is reduced. In addition, if the thickness of the coating film is significantly reduced with respect to the average particle diameter of the added silicon resin fine particles, there is a problem that the silicon resin fine particles easily fall off the coating film. In the case of using the silicon resin fine particles having the above average particle diameter suitably used in the present invention, the thickness of the coating film is preferably in the range of 0.5 to 2.0 μm. The typical coating thickness is adjusted to the average particle size of the silicon resin fine particles to be used, so that most of the added silicon resin fine particles do not become buried in the coating film,
It is determined appropriately so as not to easily fall off. In addition, the thickness of the coating film in the present invention refers to an average thickness of a portion where the silicon resin fine particles are not present (the same applies hereinafter).

Although the above-mentioned coating film may be formed on both surfaces, it is sufficient for the purpose of the present invention to be formed on only one surface. That is, there is a concern that dust and dirt adhere to the surface that is generally outward when the house or the like is extended, and therefore, the surface that is outward when the house or the like is extended is generally painted. If the film is formed, the above problem is sufficiently solved. In addition, if a substance having a property of making the coating film hydrophilic, such as colloidal silica, is added to the coating material, the coating film forming surface becomes excellent in drip-proof property, but the colloidal silica is applied to the surface which is outside at the time of spreading. The above-mentioned paint containing no, etc., the above-mentioned paint containing colloidal silica or the like is applied to the inner side surface at the time of expansion, and when a coating film is formed on both sides, not only is excellent dust resistance, but also drip-proof and It also has excellent sustainability.

As described above, the agricultural synthetic resin film of the present invention in which the stickiness of the film surface is suppressed has a better dustproof property than the conventional agricultural synthetic resin film having a coating film formed of an acrylic paint or the like. As a matter of course, the agricultural synthetic resin film of the present invention is, of course, preferably used as an outer covering for an agricultural house or the like, which is particularly required to have dustproofness, but the surface is less sticky. Since it has advantages, it is excellent in workability of extension work to agricultural facilities and can be suitably used for lining, lining curtains, open-field tunnels, and the like. In addition, the agricultural synthetic resin film of the present invention is also useful as an agricultural synthetic resin film used in a portion where the winding operation is performed since the workability of the winding operation for ventilation and the like is improved. Furthermore, it can be used as a film to form a rainwater flow channel by forming a gutter at the ridge connection part (valley part between ridges) of a multi-unit house, or to adhere to the non-formed surface of the coating film It can also be used as a tape for repairing a torn film by forming an agent layer. Furthermore, the synthetic resin film for agriculture of the present invention has excellent anti-algal properties and is suitable for use in places where algae are likely to occur.

[0034]

The present invention will be described in more detail with reference to the following specific examples.
The present invention is not limited to the embodiments described below.

Example 1 After reacting the formulations shown in Table 1, an isopropyl alcohol / ethyl acetate mixed solvent (50/50) was added to obtain an acrylic resin solution having a resin solid content of 10% by weight. Then, 25 parts by weight of a hexamethylene diisocyanate / trimethylolpropane adduct (Coronate HL; trade name, manufactured by Nippon Polyurethane) is added to 100 parts by weight of the resin solid content, and silicon resin spherical fine particles having an average particle diameter of 6 μm are further added. Paint solids 1
After adding 2 parts by weight per 00 parts by weight, the mixture was stirred with a stirrer to prepare an acrylic paint.

[0036]

[Table 1]

The obtained paint was applied to one side of a polyvinyl chloride film having a composition shown in Table 2 and having a thickness of 0.1 mm formed by calendering using a 150-mesh gravure roll. The film thickness (average thickness of the portion where the silicon resin spherical fine particles are not present) is about 1
It was coated to a thickness of μm and dried at 90 ° C. for 40 seconds to obtain the synthetic resin film for agriculture of the present invention.

[0038]

[Table 2]

The transparency, dust-proofing property and algal-proofing property of the obtained agricultural synthetic resin film were evaluated by the following methods. Table 3 shows the results.

(1) Evaluation of Transparency The haze value of the obtained agricultural synthetic resin film was measured. (2) Evaluation of dust-proof property The obtained synthetic resin film for agriculture was spread on a multi-agricultural house such that the coating film forming surface was on the outside, and 12
After a lapse of months, the haze value of the film on the ceiling of the house was measured. (3) Evaluation of anti-algal properties As described above, 12 months after the spreading, the state of algae generation in the valley portion of the continuous building was visually observed and evaluated according to the following criteria. ：: Algae is hardly observed △: Algae is slightly observed ×: Algae is extremely high

Comparative Example 1 An agricultural synthetic resin film was obtained in the same manner as in Example 1, except that spherical silicone resin particles were not added to the paint. About the obtained synthetic resin film for agriculture, transparency, dustproofness, and algaeproofness were evaluated in the same manner as in Example 1. Table 3 shows the results.

Comparative Example 2 An agricultural synthetic resin film was obtained in the same manner as in Example 1, except that silica powder was added to the paint instead of the silicon resin spherical fine particles. About the obtained synthetic resin film for agriculture, transparency, dustproofness, and algaeproofness were evaluated in the same manner as in Example 1. Table 3 shows the results.

Reference Example The transparency, dustproofness and antialgal properties were evaluated in the same manner as in Example 1, using the base films of Example 1 and Comparative Examples 1 to 3 as reference examples. Table 3 shows the results
Shown in

[0044]

[Table 3]

The paint used in the above examples is a crosslinked type solvent-based acrylic paint. However, the paint may be a paint other than the acrylic paint, and may be either a crosslinked type or a non-crosslinked type. There may be. Also,
It is not limited to the solvent type, but may be an aqueous type or an ultraviolet curable type. Further, in the above embodiment, an example was given in which a base film made of a vinyl chloride resin in which the effect of the present invention was most remarkable was used. The effect of improving the dustproof property, the algaproof property and the like without impairing the same is similarly exhibited.

[0046]

As described in detail above, the agricultural synthetic resin film of the present invention has improved dust-proofing without impairing the transparency of the synthetic resin base film. Can be suitable for growing the crop. The effect of improving dustproofness is superior to that of a conventional agricultural synthetic resin film provided with a coating film made of an acrylic paint. Furthermore, the agricultural synthetic resin film of the present invention is also excellent in anti-algal properties.

────────────────────────────────────────────────── ─── Continued on front page (51) Int.Cl. ⁷ Identification code FI // B05D 7/24 302 B05D 7/24 302P 303 303B

Claims (4)

(57) [Claims] An agricultural synthetic resin film having a coating film formed on at least one side of a base film made of a synthetic resin, wherein the coating material contains 0.2 parts of silicone resin fine particles per 100 parts by weight of resin solid content. A synthetic resin film for agricultural use, characterized in that it is a paint obtained by adding from 10 to 10 parts by weight. 2. The method according to claim 1, wherein the average particle diameter of the silicon resin fine particles is 0.1.
The agricultural synthetic resin film according to claim 1, which has a thickness of 2 to 10 µm. 3. The coating film made of an acrylic paint has an average coating film thickness at a portion where no silicon resin fine particles are present, and the average coating film thickness is 0.5
The agricultural synthetic resin film according to claim 1, wherein the thickness is from 2.0 μm to 2.0 μm. 4. The base film made of a synthetic resin is a vinyl chloride resin film.
3. The synthetic resin film for agriculture according to the above item.