JPH1034A - Agricultural olefin resin laminated film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare an agricultural olefin-resin based laminated film, excellent in transparency, the durability of fog resistance and stickiness resistance, and suitable for growth in greenhouse, etc., by laminating a coating layer consisting of an olefin resin on a surface of a base material layer consisting of a specific fogresisting composition. SOLUTION: A coating layer consisting of an olefin resin is laminated on one or both sides of a base material layer formed of a composition obtained by compounding (A) 100 pts.wt. of an olefin based resin consisting of one or more kinds selected from an ethylene-vinyl acetate copolymer, a low density polyethylene of 0.910-0.935g/cm<3> in density and an ethylene-α-olefin copolymer with (B) an antifogging agent composed of (i) 1-4 pts.wt. of a partial esterification compound of a polyhydric alcohol such as sorbitan and a 14-22C saturated fatty acid and (ii) 0.1-3 pts.wt. of a partial esterification compound of a polyhydric alcohol and oleic acid. Further, the component (ii) is preferably glycerin monooleate, diglycerin monooleate or sorbitan monooleate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural olefin resin laminated film. More specifically, the present invention relates to an agricultural olefin resin laminated film having good transparency and antifogging durability.

[0002]

2. Description of the Related Art In recent years, tunnel cultivation, house cultivation, and the like have been actively performed, and accordingly, the demand for agricultural covering materials has increased. As the agricultural coating material, vinyl chloride resin film is currently the mainstream,
Olefin-based resin films mainly composed of polyethylene or ethylene-vinyl acetate copolymer also tend to increase.

[0003] Above all, an olefin resin film containing no plasticizer in the film is less likely to be stained even when used for a long period of time, but the condensed water adhering to the inner surface of the film is not dripped onto the cultivated crop without dripping into the cultivated crop. Because the so-called anti-fog retention that flows along the surface is insufficient,
The improvement is desired.

[0004] As antifogging agents used in agricultural olefin resin films, polyhydric alcohols and carbon atoms of 14 are used.
Antifogging agents comprising a partial ester compound with a saturated fatty acid of No.-22 are conventionally used. These antifogging agents have poor compatibility with the olefin resin, and the antifogging effect is lost at an early stage. Therefore, utilizing the adsorptivity of inorganic substances such as silica and hydrotalcite, the antifogging sustain is maintained. There were some, but the actual effect was small.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an agricultural olefin resin laminated film having improved anti-fog long-term durability.

[0006]

The gist of the present invention is to provide a partial ester compound of a polyhydric alcohol and a saturated fatty acid having 14 to 22 carbon atoms with respect to 100 parts by weight of an olefin resin.
A coating layer comprising an olefin-based resin on one or both sides of a substrate layer comprising a composition comprising an antifogging agent comprising 4 parts by weight and 0.1 to 3 parts by weight of a partial ester compound of polyhydric alcohol and oleic acid The present invention is directed to an agricultural olefin resin laminated film characterized by the provision of:

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The olefin resin of the present invention is an α-olefin homopolymer or a copolymer with a different monomer containing α-olefin as a main component. For example, polyethylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-4-methyl-1-pentene copolymer ionomer resin and the like can be mentioned. Of these, low-density polyethylene and ethylene-α-olefin copolymers having a density of 0.910 to 0.935 g / and ethylene-vinyl acetate copolymers having a vinyl acetate content of 30% by weight or less have strength and transparency. It is preferable from the point of view and weather resistance.

In the present invention, polyhydric alcohols constituting the antifogging agent include sorbitan, glycerin, polyethylene glycol, trimethylolpropane, pentaerythritol and the like, as well as diglycerin, polyglycerin, condensates of sorbitan / glycerin, sorbitan / Condensates of alkylene glycol can also be mentioned.

The above polyhydric alcohol of the present invention and C1
Antifogging agents composed of 4 to 22 saturated fatty acids or partial ester compounds with oleic acid include alkylene oxide adducts of these partial esters.

The compounding amount of the antifogging agent comprising a partial ester compound of a polyhydric alcohol and a saturated fatty acid having 14 to 22 carbon atoms is in the range of 1 to 4 parts by weight, preferably 1.5 to 3 parts by weight. . If the amount is less than 1 part by weight, the antifogging property is not sufficiently exhibited, and if the amount exceeds 4 parts by weight, bleeding is liable to occur, and the transparency of the film is undesirably reduced. The compounding amount of the antifogging agent comprising a partial ester compound of polyhydric alcohol and oleic acid is in the range of 0.1 to 3 parts by weight, preferably 0.3 to 2 parts by weight. If the amount is less than 0.1 part by weight, the anti-fogging sustaining effect is not sufficiently exhibited. Each of these anti-fogging agents can be used alone or in combination of two or more.

The agricultural olefin resin laminated film of the present invention further contains other conventional additives such as inorganic fillers, ultraviolet absorbers, hindered amine light stabilizers, and antifog agents. can do.

The inorganic filler which can be used in the present invention is preferably one having an infrared absorbing ability, and examples thereof include oxides, hydroxides, carbonates, silicates and composites thereof. Specific examples include silica, talc, hydrotalcites, mica, zeolite, magnesium carbonate, aluminum hydroxide, zirconium phosphate, and the like. These can be used alone or in combination of two or more. The size of these inorganic fillers is 0.0
Those having a thickness of about 1 to 10 μm are preferred.

As the ultraviolet absorber, 2-hydroxy-
4-methoxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2 ', 4,4'-
Benzophenones such as tetrahydroxybenzophenone; 2- (2'-hydroxy-5'-methylphenyl)
Benzotriazole, 2- (2'-hydroxy-5'-
tert-butylphenyl) benzotriazole, 2-
(2′-hydroxy-3′-methyl-5′-tert-
In addition to benzotriazoles such as butylphenyl) benzotriazole and 2- (2′-hydroxy-5′-tert-butylphenyl) -5-chlorobenzotriazole, salicylic acids may be mentioned.

Examples of the hindered amine light stabilizers include those described in JP-A-1-197543 and JP-A-2-30529, and specific examples of commercially available compounds include TINUVIN770. ,
TINUVIN780, TINUVIN144, TIN
UVIN 622LD, CHIMASSORB 944 (all manufactured by Ciba Geigy), MARK LA-57, MA
RK LA-62, MARK LA-63, MARK
LA-67, MARK LA-68 (all manufactured by Asahi Denka Co., Ltd.) and the like.

[0015] Examples of the antifog agent include silicone surfactants and fluorine surfactants. As the fluorine-based surfactant, a polymer containing a perfluoroalkyl group or a perfluoroalkenyl group or a low-molecular surfactant is used, and is generally at least 0.001% by weight, preferably 0.01% by weight. % Of water in water at 25 ° C.
Those having the ability to reduce the density to not more than yn / cm, preferably not more than 30 dyn / cm are preferable. Specific examples of commercially available compounds include Unidyne DS-401, Unidyne DS-403, Unidyne DS-451 (all manufactured by Daikin Industries, Ltd.), Surflon S-121, Surflon S-131, Surflon S-141 and Surflon. S-3
81, Surflon S-382 (all manufactured by Asahi Glass Co., Ltd.) and the like. The amount of the antifog is usually 0.01 to 1 part by weight, preferably 0.1 to 1 part by weight, per 100 parts by weight of the base resin.
0.5 to 0.5 parts by weight.

In addition to these additives, various additives such as a lubricant, a heat stabilizer, an antioxidant, and a coloring agent can be contained as required. Lubricants include polyethylene wax, fatty acid amide, stearic acid, etc., heat stabilizers, and antioxidants include metal salts of carboxylic acids, chelators such as phenolic antioxidants and organic phosphites. No.

To prepare the laminated film for agricultural olefin resin of the present invention, various additives such as the above-mentioned anti-fogging agent are blended in a predetermined ratio to the base resin, and kneaded to prepare a resin composition. After that, co-extrusion inflation processing,
The film can be formed by an ordinary lamination processing method such as co-extrusion T-die processing. Such a film is transparent,
A matte or semi-matte finish may be used, and the thickness of the film is not preferable because the strength is insufficient if the film is too thin. Conversely, if the film is too thick, it causes inconvenience in film forming work and the like. , Preferably 0.05 to
It is selected in the range of 0.2 mm.

[0018]

Next, the present invention will be described in more detail by way of examples. In addition, the evaluation of the physical properties in each example was performed by the following methods.

(1) Antifogging property: A film was spread on an inclined frame on the upper surface of a water tank at a water temperature of 40 ° C. in a constant temperature room at an air temperature of 10 ° C., and the adhesion state of water droplets on the inner surface of the film was observed. ：: No water droplets adhered, or a degree to which water droplets slightly adhered. Δ: Some adhesion of water droplets. ×: Water droplets adhered much, and the water droplets fell from the film surface.

(2) Transparency: The film was spread in a thermo-hygrostat at a temperature of 40 ° C. and a humidity of 60%, and after one month, HAZE
The value was evaluated. ：: less than 40% ×: 40% or more

(3) Stickiness resistance: The condition when two sheets of film were peeled off in a constant temperature room at 23 ° C. was evaluated. ：: Easy peeling without stickiness. Δ: Slightly sticky, but peelable. ×: Vigorous stickiness and difficult to peel.

Example 1 Antifogging comprising 1.5 parts by weight of sorbitan monostearate and 0.3 part by weight of diglycerin monooleate per 100 parts by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate unit content of 15% by weight. Agent, hindered amine light stabilizer 0.5
Parts by weight and 3 parts by weight of silica having an average particle size of 3 μm were added, and pellets for an intermediate layer were prepared with an extruder. next,
To 100 parts by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate unit content of 5% by weight, an antifogging agent consisting of 1.5 parts by weight of sorbitan monostearate and 0.5 part by weight of a hindered amine light stabilizer were added, Pellets for the surface layer were prepared by an extruder. The intermediate pellets are supplied to the intermediate extruder of the three-layer inflation molding machine, and the surface layer pellets are supplied to the extruders for the surface layers on both sides. A resin laminated film was obtained. The antifogging property, transparency and stickiness resistance of the obtained film were measured, and the results are shown in Table 1.

Example 2 1 part by weight of sorbitan monopalmitate and 1 part by weight of glycerin monostearate were used as the antifogging agent for the pellets for the intermediate layer in Example 1.
Parts by weight of diglycerin monooleate and 0.5 parts by weight of diglycerin monooleate, and 1 part by weight of sorbitan monopalmitate and 1 part by weight of glycerin monostearate were used as the antifogging agent for the pellets for the surface layer of Example 1. In the same way as 1,
Using a three-layer inflation molding machine, two and three-layer agricultural olefin resin laminated films were obtained. The antifogging property, transparency and stickiness resistance of the obtained film were measured,
Table 1 shows the results.

Example 3 Three-layer inflation was carried out in the same manner as in Example 1 except that 0.3 parts by weight of diglycerin monooleate as the antifogging agent of the pellets for the intermediate layer in Example 1 was changed to 1.0 part by weight. Using a molding machine, two and three layers of agricultural olefin resin laminated films were obtained. The antifogging property, transparency and stickiness resistance of the obtained film were measured, and the results are shown in Table 1.

Example 4 The antifogging agent for the pellets for the intermediate layer in Example 1 was a sorbitan monostearate ethylene oxide 1 mol adduct 1.5.
Parts by weight and 2.0 parts by weight of diglycerin monooleate, and the antifogging agent of the pellets for the surface layer of Example 1 was changed to 1.5 parts by weight of a 1 mol ethylene oxide adduct of sorbitan monostearate. As in Example 1,
Using a three-layer inflation molding machine, two and three-layer agricultural olefin resin laminated films were obtained. The antifogging property, transparency and stickiness resistance of the obtained film were measured,
Table 1 shows the results.

Comparative Example 1 In the same manner as in Example 1 except that diglycerin monooleate was not used as the antifogging agent for the pellets for the intermediate layer in Example 1, two types of inflation molding machines were used. A three-layer agricultural olefin resin laminated film was obtained.
The antifogging property, transparency and stickiness resistance of the obtained film were measured, and the results are shown in Table 2.

Comparative Example 2 In the same manner as in Example 2 except that diglycerin monooleate was not used as the antifogging agent for the pellets for the intermediate layer in Example 2, two types of inflation molding machines were used. A three-layer agricultural olefin resin laminated film was obtained.
The antifogging property, transparency and stickiness resistance of the obtained film were measured, and the results are shown in Table 2.

Comparative Example 3 A three-layer inflation molding machine was used in the same manner as in Example 2 except that the blending amount of diglycerin monooleate was changed to 5 parts by weight as the antifogging agent for the pellets for the intermediate layer in Example 2. Thus, two or three layers of an agricultural olefin resin laminated film were obtained. The antifogging property, transparency and stickiness resistance of the obtained film were measured, and the results are shown in Table 2.

Comparative Example 4 As an antifogging agent for the pellets for the intermediate layer in Example 4, the addition of 3.5 mole parts of 1 mol of ethylene oxide adduct of sorbitan monostearate was carried out except that diglycerin monooleate was not used. In the same manner as in Example 4, two-layer three-layer agricultural olefin-based resin laminated films were obtained using a three-layer inflation molding machine. The antifogging property, transparency and stickiness resistance of the obtained film were measured, and the results are shown in Table 2.

[0030]

[Table 1]

[0031]

EFFECT OF THE INVENTION The olefin resin laminated film for agricultural use of the present invention is excellent in transparency, antifogging durability and stickiness, and is suitable as a coating material for house cultivation or tunnel cultivation.

[Table 2]

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location C08L 23/00 KEQ C08L 23/00 KEQ

Claims (3)

[Claims] Claims: 1. An amount of olefin resin is 100 parts by weight.
An antifogging agent comprising 1 to 4 parts by weight of a partial ester compound of a polyhydric alcohol and a saturated fatty acid having 14 to 22 carbon atoms and 0.1 to 3 parts by weight of a partial ester compound of a polyhydric alcohol and oleic acid was blended. An agricultural olefin resin laminated film characterized by providing a coating layer composed of an olefin resin on one or both surfaces of a base material layer composed of a composition. 2. The olefin resin comprises one or more of ethylene-vinyl acetate copolymer, low-density polyethylene having a density of 0.910 to 0.935 g / or ethylene-α-olefin copolymer. Item 4. The laminated olefin resin film for agricultural use according to Item 1. 3. The laminated olefin resin film for agricultural use according to claim 1, wherein the partial ester compound of the polyhydric alcohol and oleic acid is glycerin monooleate, diglycerin monooleate or sorbitan monooleate.