JPH0125779B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a film for covering greenhouses for greenhouse horticulture used for cultivating useful plants. More specifically, the present invention relates to an agricultural vinyl chloride resin film that gradually improves the ultraviolet transmittance of the film during expansion compared to the initial stage, and has excellent long-lasting anti-fog and anti-fog properties. be. [Prior Art] Conventionally, greenhouses for greenhouse horticulture using various covering materials have been frequently used to create an artificial cultivation environment when cultivating useful plants. Typical examples include coating materials such as vinyl chloride resin film, PE film, EVA film, PET film, PC film, and glass. It is widely used due to its excellent properties. In addition, these greenhouses for greenhouse horticulture include small tunnel houses, single pipe houses,
Multi-building houses, steel frame single buildings, and multi-building houses became popular.
Covering methods include single-layer coating, double-layer coating, triple-layer coating, and multi-layer coating, which have come to be widely used in various combinations depending on the purpose. In addition to the coating materials that are used due to the different materials used, colored films with various coloring agents added have been developed, and are useful for irradiating the plant body with effective light quality that is compatible with the growth physiology of the plant and promoting the desired growth. Techniques for preventing pests and diseases and promoting or controlling the formation of fruit color and flower color by blocking or transmitting near ultraviolet rays have been developed. However, in both of these colored films and near-ultraviolet control films, the same film is continuously spread and cultivated during the period from planting to harvesting of useful crops. In some cases, winter forced cultivation is carried out in a horticultural facility, and after the cultivation of the crop is completed, the covering material is continued without being replaced, and another type of crop is subsequently cultivated using the same facility. [Problems to be Solved by the Invention] Originally, based on plant physiology, the most suitable light quality for each growth stage of a plant differs for each growth stage. However, for crop producers, changing the covering material as needed to create the optimal light environment for each developmental stage has disadvantages such as economical and temporary exposure of plants to cold air when changing the covering material, so it is not practical. was difficult. [Means for Solving the Problem] The inventors have proposed that a specific β-diketone compound has a property of absorbing light in the ultraviolet band of at least a wavelength of 290 to 380 nm, and that it absorbs light gradually and in a relatively short period of time when exposed to sunlight. It has the property of disappearing ultraviolet absorption properties,
and that the compound exhibits excellent properties when used in the cultivation of useful plants as a film whose ultraviolet transmittance improves over time when the compound is applied to an agricultural soft vinyl chloride resin film at the composition ratio of the present invention; Furthermore, they discovered that the rate of change in ultraviolet light transmittance over time can be varied over a wide range by selecting a combination of film composition and method of use, and that it has the effect of improving the sustainability of anti-fogging and anti-fog properties, thus completing the present invention. This is what I did. That is, the first invention of the present application uses 30 to 55 parts by weight of a phthalate plasticizer and 0.1 to 0.1 to 55 parts by weight of a phosphate plasticizer to 100 parts by weight of a vinyl chloride resin.
10 parts by weight, higher fatty acids of polyhydric alcohols (carbon number
0.5 to 5 parts by weight of an ester nonionic surfactant (16 to 18 saturated fatty acids are 70 to 100% by weight);
0.01 to 1.0 parts by weight of a fluorine-based surfactant and/or a silicone-based surfactant, and at least a wavelength of 290
A β-diketone compound that has an absorption property in the ultraviolet band of ~380 nm and has the property that the absorption ability of light in the ultraviolet band decreases when exposed to sunlight.
The second invention is an agricultural vinyl chloride resin film characterized in that the ultraviolet transmittance improves over time by containing ~1.0 parts by weight of phthalic acid per 100 parts by weight of the vinyl chloride resin. Ester plasticizer 30~55 parts by weight, phosphate ester plasticizer 0.1~
10 parts by weight, higher fatty acids of polyhydric alcohols (carbon number
16-18 saturated fatty acids are 70-100% by weight) 0.5-5 parts by weight of an ester nonionic surfactant, 0.01-1.0 parts by weight of a fluorine-based surfactant, and/or a silicone-based surfactant, and At least wavelength 290 ~
A β-diketone compound that has absorption characteristics in the ultraviolet band of 380 nm and has the property of improving the transmittance of light in the ultraviolet band when exposed to sunlight.
1.0 parts by weight of an agricultural vinyl chloride resin, which has an acrylic resin coating or an ultraviolet curable urethane acrylate resin coating formed on one side of the film, and is characterized in that its ultraviolet transmittance improves over time. The third invention is a film, and the third invention is based on 100 parts by weight of vinyl chloride resin, 30 to 55 parts by weight of phthalate plasticizer, and phosphate ester plasticizer.
0.1 to 10 parts by weight, higher fatty acids of polyhydric alcohols (70 to 100% by weight of saturated fatty acids having 16 to 18 carbon atoms), 0.5 to 5 parts by weight of ester nonionic surfactants, fluorine surfactants, and /or 100% acrylic resin on one side of a film made of a resin composition containing 0.01 to 1.0 parts by weight of a silicone surfactant.
Per part by weight, contain 0.1 to 10 β-diketone compounds that have absorption properties in the ultraviolet band of wavelengths of at least 290 to 380 nm, and have the property of reducing the absorption ability of light in the ultraviolet band when exposed to sunlight. This is a soft vinyl chloride resin film for agricultural use, characterized in that the ultraviolet transmittance of the film improves over time by forming an acrylic resin coating containing parts by weight of the film. In the present invention, vinyl chloride resin refers to vinyl chloride homopolymer resin, vinyl chloride and vinyl acetate,
Examples include ethylene, propylene, vinylidene chloride, acrylic acid, acrylic esters, methacrylic acid, copolymer resins with methacrylic esters, and mixtures thereof. The vinyl chloride resin may have an average degree of polymerization of 800 to 4,500. The film according to the present invention contains 30 to 55 parts by weight of a phthalate ester plasticizer and a phosphate ester plasticizer.
0.1 to 10 parts by weight is blended. The phthalate ester plasticizer is used in an amount of 30 to 55 parts by weight in order to ensure the flexibility of the coating material at low temperatures and to suppress blocking at high temperatures. In addition, the plasticizer has the role of substantially blocking the transmission of far ultraviolet rays of 290 nm or less, which are harmful wavelengths. The phosphate ester plasticizer has the effect of imparting weather resistance under ultraviolet rays, and is used in an amount of 0.1 to 10 parts by weight. Outside this range, the purpose of imparting weather resistance cannot be achieved and it is unsuitable. As a phthalate ester plasticizer, G-2-
Examples include ethylhexyl phthalate, di-nonyl phthalate, di-decyl phthalate, di-dodecyl phthalate, di-undecyl phthalate, di-tridecyl phthalate, di-n-octyl phthalate, and butylbenzyl phthalate. Phosphate ester plasticizers include tricresyl phosphate, tricylenyl phosphate, monoxylenyl dicresyl phosphate, dixylenyl phosphate, dicresyl ethylphenol phosphate, cresyl diethylphenol phosphate, and dixylenyl ethylphenol phosphate. ate, xylenyl diethyl phenyl phosphate, triethylphenyl phosphate, cresyl diphenyl phosphate, dicresyl phenyl phosphate, xylenyl diphenyl phosphate, dixylenyl phenyl phosphate, and the like. In particular, it is preferable to use the first four types alone or in combination. The higher fatty acid ester nonionic surfactant of polyhydric alcohol is used in an amount of 0.5 to 5 parts by weight. If it is less than 0.5 parts by weight, the antifogging properties will be insufficient and a film with the desired effect will not be obtained. If more than 5 parts by weight is used, the desired effect will not change, and weather resistance will deteriorate and bloom will increase, making it unsuitable. Sorbitol-based and/or mannitol-based alcohols or alcohols from which 1 to 2 molecules of water have been removed as polyhydric alcohols, and products containing 70 to 100% by weight of saturated fatty acids with 16 to 18 carbon atoms as higher fatty acids. These are partial ester compounds obtained by esterification reaction using each of them alone or in combination.
It is also possible to use ethylene oxide or an adduct of 5 moles or less of propylene oxide of this compound. Higher fatty acids containing less than 70% saturated fatty acids having 16 to 18 carbon atoms are unsuitable. A large amount of saturated fatty acids having carbon atoms of 14 or less is not suitable because the antifogging durability deteriorates and the film becomes sticky. If there is a large amount of saturated fatty acids having 20 or more carbon atoms, the antifogging property under low temperature conditions will deteriorate, making it unsuitable. A large amount of unsaturated fatty acids is unsuitable in terms of weather resistance. Fluorine-based surfactants and/or silicone-based surfactants allow condensed water to quickly form a uniform running water film, speeding up transparency, and suppressing fog formation in the greenhouse to prevent water droplets from adhering to fruit surfaces. It is necessary to achieve the object of the present invention because it improves the commercial value by improving glossiness, improves the irradiation of light rays to plants by suppressing fog, and suppresses the occurrence of diseases caused by high humidity. The fluorine-based surfactant and silicone-based surfactant used are disclosed in JP-A-59-217740 and JP-A-57-
12070, JP-A-59-80468, JP-A-59-93739, JP-A-59-217739, JP-A-61-133244, etc. are used. The amount used ranges from 0.01 to 1.0 parts by weight. If it is less than 0.01 part by weight, no effect will be obtained, and if it is used in excess of 1.0 part by weight, the weather resistance will be poor and unsuitable. The amount used should be selected appropriately depending on the type and effect. β-- which has absorption characteristics at least in the ultraviolet band with a wavelength of 290 to 380 nm, and has the characteristic that the absorption ability of light in the ultraviolet band decreases when exposed to sunlight.
Diketone compounds include dibenzoylmethane,
Methoxybenzoyl, benzoylmethane, chlorobenzoyl, benzoylmethane, palmitylbenzoylmethane, etc. can be used. In particular, dibenzoylmethane is suitable from the viewpoints of ultraviolet absorption, film processability, and economy. The amount added is 0.01 to 1.0 parts by weight in the case of a film, and 0.1 to 10 parts by weight in the case of a coated film. Select as appropriate depending on film thickness, ultraviolet transmittance, etc. If it is less than the lower limit, no effect will be obtained, and if it exceeds the upper limit, it will be economically disadvantageous. Furthermore, the addition of the β-diketone compound used in the present invention has the effect of improving the durability of the antifogging and antifogging properties of the coating material. Among β-diketone compounds, dibenzoylmethane is particularly effective. The reason why the durability of the anti-fog and anti-fog properties is improved is not clear, but it is thought to be due to the suppression of deterioration of the surfactant in the film due to ultraviolet rays in sunlight. The agricultural soft vinyl chloride film or acrylic resin coating may contain 0.01 to 1.0 parts by weight of an ultraviolet absorber. If the amount is less than 0.01 part by weight, no effect can be obtained, and if it is more than 1.0 part by weight, the effect of increasing the transmittance in the ultraviolet band over time cannot be clearly obtained, which is inappropriate. The effect of using an ultraviolet absorber is that it slows down the rate at which ultraviolet transmittance increases over time. Usable ultraviolet absorbers include the following: Benzophenone series, 2-hydroxy-
4-methoxybenzophenone, 2-hydroxy-
4-n octoxybenzophenone, 2.4-dihydroxybenzophenone, 2-hydroxy-4-methoxy-2'-carboxybenzophenone, etc., benzotriazole series, 2(2'-hydroxy-5'-methylphenyl)benzo Triazole, 2(2'-hydroxy-3'-t-butyl-5'-methylphenyl-5-chlorobenzotriazole, 2(2'-hydroxy-3',5'-di-t-butylphenyl)-5
-Chlorobenzotriazole, 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2(2'-hydroxy-3',5'-di-t-amylphenyl)benzotriazole, etc., salicylate type , p-tert-butylphenyl salicylate, 2,4-tert-butylphenyl-3,5
tert-butyl 4-hydroxybenzoate,
p-octylphenyl salicylate, dioctyl salicylate, phenyl salicylate, etc., oxalic acid anilide series, N-(2-ethylbenzyl),
N'-(2-ethoxy-5-t-butylbenzyl)
Examples include oxalanilide, N-(2-ethylbenzyl)/N'(2ethoxybenzyl)oxalanilide, and the like. The acrylic resin coating formed on one side of the film is a homopolymer of monomer compounds of acrylic esters and methacrylic esters, or a copolymer of two or more of these monomers, or a monomer compound of these monomers. Examples include resin coatings made of copolymers containing these as main components and other copolymerizable monomers. Examples of acrylic acid esters include C ₁ -C ₂₂ alkyl esters of acrylic acid such as methyl acrylate, ethyl acrylate, n-propyl acrylate, 1-propyl acrylate, n-butyl acrylate, and 1-butyl acrylate; As acrylic esters, methyl methacrylate, ethyl methacrylate, n
-Propyl methacrylate, 1-propyl methacrylate, n-butyl methacrylate, 1
_-C1 to _C22 alkyl esters of methacrylic acid such as butyl methacrylate. Other compounds that can be copolymerized with these compounds include α, β-unsaturated fatty acids such as acrylic acid and methacrylic acid, hydroxymethyl ester, hydroxyethyl ester, hydroxypropyl ester, and hydroxyl ester of acrylic acid. Examples include butyl ester, hydroxypentyl ester and hydroxyhexyl ester, and hydroxymethyl ester, hydroxyethyl ester, hydroxypropyl ester, hydroxypentyl ester and hydroxyhexyl ester of methacrylic acid. Further, the hydroxy-containing acrylic resin can also be crosslinked using an isocyanate compound. UV curing urethane formed on one side of the film.
In addition to being a urethane acrylate resin with a polymer molecular weight/number of polymerizable double bonds in the polymer of 1000 to 5000, the acrylate resin coating can also contain a polymerizable monomer; It can contain viscosity modifiers, antifoaming agents, photosensitizers, etc. The polymerizable urethane acrylate resin used in the present invention is a polyether polyol and/or a polyester polyol, or a polyurethane polyol obtained by reacting a polyether polyol, a polyester polyol, etc. with a polyisocyanate. It is obtained by reacting an isocyanate compound and an ethylenically unsaturated compound having active hydrogen. Polyether polyols are obtained by reacting alkylene oxides such as ethylene oxide with polyols such as ethylene glycol, 1,4-butanediol, and 1,2-propylene glycol. Polyester polyols are obtained by reacting polyols, glycidyl ether compounds, and polybasic acids. Di- or triisocyanates are suitable as polyfunctional isocyanate compounds. Ethylenically unsaturated compounds with active hydrogen include:
Hydroxy group-containing compounds, amino group-containing compounds,
Examples include reaction products of acrylic acid or methacrylic acid and a monoepoxy compound, and reaction products of glycidyl acrylate or glycidyl methacrylate and a monocarboxylic acid-containing compound or a secondary monoamine compound. When the agricultural soft vinyl chloride resin film of the present invention is spread in a greenhouse, it is used so that the surface of the film coated with an acrylic resin coating or an ultraviolet curable urethane acrylate resin coating is on the outside. Other additives include Ba.Ca.Zn.Sn.Cd heat stabilizers, phosphite chelating agents, hindered amine light stabilizers, antioxidants, fillers,
Coloring agents, acrylic acid resins for improving processability, epoxy group-containing thermal stabilization aids, antistatic agents, other surfactants, far-infrared absorbing compounds, deodorants, etc. should be used within the range that ensures performance. I can do it. [Examples] Hereinafter, the present invention will be explained in detail based on Examples, but the present invention is not limited to these Examples. Example 1 The composition shown in Table 1 was rolled using a heated roll to obtain a film having a thickness of 0.1 m/m. Films of the invention are numbered 2, 3, 4, 8. The characteristics of the film were evaluated using the following items and methods.

【table】

[Table] (A) Speed of forming a running film of condensation water 60 films of each number 1 to 11 were placed in 11 north-south tunnel houses with a width of 1.2 m, a height of 90 cm, and a length of 2 m.
The coating was expanded on November 19th. At 15:00 on November 25th, the film was ventilated to dry the inner surface of the film, and then the film was closed at 8:00 the next day. 1/2 of the total area of the covering film
The evaluation was based on the time (unit: minutes) required for the area of the sample to reach the droplet state. (B) Droplet properties in winter In the tunnel house mentioned in (A) above, on November 26th
At 13:00, the state of the droplets was visually observed. 〇 There are few flow lines and the droplet condition is good. △ There are more running streaks than those marked with ○. × There are clearly areas where water droplets are attached and the droplet state is poor. (C) Fog resistance From November 26th at the tunnel house mentioned in (A) above.
From 15:00 to 16:00 on the 27th, the state of fog generation on the inner surface of the house film was visually observed. 〇 No fog is observed. × Fog is observed. (D) Anti-fogging durability Using the tunnel house of (A) above, ventilation was performed for 2 hours (13:00 to 15:00) mainly on sunny days after December 1st. The droplet condition was evaluated at 12:00 2 months later (January 23rd) and 5 months later (May 8th). 〇 There are few flow lines and the droplet condition is good. □ Water droplet adhesion area occurrence rate is in the range of 3 to 5%. △〃6～10%〃. ×〃11% or more〃. (E) Ultraviolet absorption characteristics Measured using a spectral light transmittance measuring device. It is expressed as the transmittance (unit: %) of ultraviolet light with a wavelength of 350 nm. (F) Change characteristics of ultraviolet transmittance A single-layer coating (outer coating) or two-layer coating of (A) to (E) shown in Table 2 shows the films listed in Table 1 in a test house with a 45-degree inclination angle to the south. After coating (outer lining and inner lining), the spectral light transmittance of the film was measured over time, and the results are shown in Table 2 and Figures 1 to 6.

【table】

[Table] The film was measured after wiping off the dust adhering to the surface. Expansion date: November 27, 1960 First sampling date: December 4, 1960 Second sampling: December 17, 1960 Third sampling: December 24, 1960 Fourth sampling: December 17, 1960 January 10th The following can be seen from Tables 1 and 2 and Figures 1 to 6. (a) Films Nos. 2, 3, 4, and 8 of the present invention have excellent properties such as rapid formation of a running film of dew condensation, low-temperature droplet properties, anti-fog properties, and long-lasting anti-fogging properties, and are resistant to sunlight exposure over time. This indicates that the films of the present invention (numbers 2, 3, and 3) have the property of improving ultraviolet transmittance.
4) shows that the anti-fog durability is improved. (c) The rate of change in ultraviolet transmittance depends on the combination of outer and inner linings (e.g. lining film number 2 in Table 2 A and E), and whether or not they are used in combination with an ultraviolet absorber (e.g. Table 2 A and E). (2) Outer film numbers 2 and 8) indicate that the amount can be changed depending on the amount added. (d) Products (numbers 1, 5, 6, 7, 9, 10, and 11) that do not have the composition as claimed in the claims have poor ultraviolet absorption properties, antifogging properties, and antifogging properties. Example 2 Obtained by reacting a composition of 50 parts by weight of methyl methacrylate, 35 parts by weight of butyl methacrylate, 15 parts by weight of 2-hydroxyethyl methacrylate, 0.6 parts by weight of azobisisobutyronitrile, and 200 parts by weight of isobutyl acetate. A paint made by adding 200 parts by weight of isopropyl alcohol and 3.5 parts by weight of dibenzoylmethane to an acrylic resin liquid with a molecular weight of 60,000 was applied to one side of a 0.1 m/m thick film of No. 1 in Table 1 using a mesh roll and a smooth bar. A film with a coating film having a thickness of 2 μm was obtained. The ultraviolet transmission/absorption characteristics and change characteristics of the coated film and the uncoated film No. 1 (for comparison) were measured in the same manner as in (E) and (F) of Example 1 for single-layer coating (with the coated surface facing outward). evaluated. The results are shown in Table 3.
It is shown as a transmittance value at 350 nm.

[Table] Unit %
It can be seen from Table 3 that the coated film of the present invention has a property that the ultraviolet transmittance improves over time. Example 3 Spinach cultivation test Test location: Tatebayashi district, Gunma Prefecture Variety: Atlas House; Two single-building houses (east and west buildings) with a width of 3 m, height of 1.8 m, and length of 10 m were used Date of sowing, date of covering: January 1961 Seed method: Bed width 100 cm, 4 rows, spacing 15 cm Coating method: Cover the outer film of each ridge with No. 2 film (invention) and No. 1 film (comparative example) in Table 1 of Example 1. did. The tunnel was lined with No. 1 film at night until March 3rd. Harvest date: March 13th Cultivation results: Table 4 shows the harvest results for 1 m ² of each greenhouse.

[Table] (Note)
Superior stocks: healthy stocks with a plant height of 15 cm or more Superior stocks ratio: (number of superior stocks/total number of stocks) x 100
From Table 4, it can be seen that spinach grown under the film of the present invention is superior in number of leaves, leaf thickness, and yield of high quality plants. Example 4 Strawberry cultivation test Test location: Ashikaga district, Tochigi Prefecture Variety: Onho House: Two single-building houses (east and west buildings) with a width of 5.4 m, a height of 2 m, and a length of 30 m were used Seedlings collected: July 29, 1960 Planting: September 20, 1960 Bed width: 100 cm, plant spacing: 18 cm, 2 rows of staggered planting Covering method: On October 24, each ridge was covered with No. 8 film in Table 1 of Example 1 (this invention) and No. 9 film (comparative example). Heat retention conditions: No heating. Double tunnel coating inside the house (inner number 1 film, outer silver agricultural vinyl) Survey date: January 23, 1961, and the results are shown in Table 5.

〔effect〕

The present invention promotes growth by suppressing ultraviolet ray transmittance at the early stage of cultivation, and improves the ultraviolet transmittance over time, making it possible to harvest crops that receive excellent quality evaluations in the market. This is a covering material for greenhouse horticulture that ensures light quality suitable for the stage. More specifically, in the cultivation of leafy vegetables, the initial growth is promoted, the yield is large, and products with thick mesophyll that have excellent shelf life during the distribution process after shipment can be obtained. For root vegetables such as radish, turnip, ginger, etc., it is possible to promote the initial growth of above-ground leaves and to obtain products with enlarged roots at the time of harvest. For fruit vegetables such as strawberries and grapes, and fruit trees, it is possible to harvest crops with an early harvesting effect and excellent colored fruits. Furthermore, it suppresses the deterioration in the durability of anti-fog and anti-fog properties that tends to occur with coating materials with high UV transmittance.
It is possible to improve sustainability.

[Brief explanation of drawings]

Figure 1 is a diagram showing changes in light transmittance of the outer lining film in Table 2 A, Figure 2 is a diagram showing changes in light transmittance of the lining film in Table 2 A, and Figure 3 is a diagram showing changes in light transmittance of the lining film in Table 2 A. Figure 4 is a diagram showing the change in light transmittance of the lining film in Table 2 B, Figure 5 is a diagram showing the change in light transmittance of the outer film in Table 2 C. FIG. 6 is a diagram showing changes in light transmittance of the outer film of Table 2 (d).

Claims (1)

[Claims] 1. Based on 100 parts by weight of vinyl chloride resin, 30 to 55 parts by weight of phthalate plasticizer, 0.1 to 10 parts by weight of phosphate plasticizer, higher fatty acid of polyhydric alcohol (carbon number 70 to 16 to 18 saturated fatty acids
100% by weight) 0.5 to 5 parts by weight of an ester nonionic surfactant, a fluorine-based surfactant, and/or
or 0.01 to 1.0 parts by weight of a silicon-based surfactant, which has absorption characteristics in the ultraviolet band of at least a wavelength of 290 to 380 nm, and has the property of improving the transmittance of light in the ultraviolet band when exposed to sunlight. β-
An agricultural vinyl chloride resin film containing 0.01 to 1.0 parts by weight of a diketone compound and characterized in that its ultraviolet transmittance improves over time. 2 β that has absorption characteristics at least in the ultraviolet band with a wavelength of 290 to 380 nm, and has the property of improving the transmittance of light in the ultraviolet band when exposed to sunlight.
- The agricultural vinyl chloride resin film according to claim 1, wherein the diketone compound is dibenzoylmethane. 3. Claims 1 or 2 containing 0.01 to 1.0 parts by weight of at least one of benzophenone compounds, benzotriazole compounds, salicylate compounds, and oxalic acid anilide compounds as ultraviolet absorbers. The agricultural vinyl chloride resin film described above. 4 For 100 parts by weight of vinyl chloride resin, 30 to 55 parts by weight of phthalate plasticizer, 0.1 to 10 parts by weight of phosphate plasticizer, higher fatty acid of polyhydric alcohol (saturated fatty acid with 16 to 18 carbon atoms) is 70～
100% by weight) 0.5 to 5 parts by weight of an ester nonionic surfactant, a fluorine-based surfactant, and/or
or 0.01 to 1.0 parts by weight of a silicon-based surfactant, which has absorption characteristics in the ultraviolet band of at least a wavelength of 290 to 380 nm, and has the property of improving the transmittance of light in the ultraviolet band when exposed to sunlight. β-
Agriculture characterized by an acrylic resin coating or an ultraviolet curable urethane acrylate resin coating being formed on one side of a film containing 0.01 to 1.0 parts by weight of a diketone compound, the ultraviolet transmittance of which improves over time. Vinyl chloride resin film for use. 5. The acrylic resin coating or the ultraviolet curable urethane acrylate resin coating has an absorption characteristic in the ultraviolet band of at least a wavelength of 290 to 380 nm per 100 parts by weight of the resin, and when exposed to sunlight, it absorbs in the ultraviolet band. 5. The agricultural vinyl chloride resin film according to claim 4, which contains 0.1 to 10 parts by weight of a β-diketone compound having a property of improving light transmittance. 6 Acrylic resin coating is acrylic resin 100%
A patent claim that is an acrylic resin coating containing 0.1 to 10 parts by weight of at least one of benzophenone compounds, benzotriazole compounds, salicylate compounds, and oxalic acid anilide compounds, which are ultraviolet absorbers. Agricultural vinyl chloride resin film according to item 4 or 5. 7 For 100 parts by weight of vinyl chloride resin, 30 to 55 parts by weight of phthalate plasticizer, 0.1 to 10 parts by weight of phosphate plasticizer, higher fatty acids of polyhydric alcohols (saturated fatty acids with 16 to 18 carbon atoms) is 70～
100% by weight) 0.5 to 5 parts by weight of an ester nonionic surfactant, a fluorine-based surfactant, and/or
Or, on one side of a film made of a resin composition containing 0.01 to 1.0 parts by weight of a silicone surfactant, a wavelength of at least 290
A β-diketone compound that has an absorption property in the ultraviolet band of ~380 nm and has the property that the absorption ability of light in the ultraviolet band decreases when exposed to sunlight.
1. A soft vinyl chloride resin film for agricultural use, characterized in that an acrylic resin film containing up to 1.0 parts by weight is formed, and the ultraviolet transmittance of the film improves over time. 8 β that has absorption characteristics at least in the ultraviolet band with a wavelength of 290 to 380 nm, and has the property that the absorption ability of light in the ultraviolet band decreases when exposed to sunlight.
- The agricultural vinyl chloride resin film according to claim 7, wherein the diketone compound is dibenzoylmethane.