JP3184766B2 - Agricultural olefin 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 olefin resin film. More specifically, the present invention relates to an agricultural olefin resin film having excellent 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 films has been increasing. At present, polyvinyl chloride resin films are the mainstream for this agricultural film,
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. Because the so-called anti-fog retention that flows along the surface is insufficient,
The improvement is desired.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an agricultural olefin resin film having improved transparency and anti-fogging property over a long period of time. It is.

[0005]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a method for protecting a polyolefin from 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. An agricultural olefin resin film comprising a clouding agent and 0.05 to 0.5 parts by weight of a metal salt of a linear paraffin sulfonic acid.

[0006]

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. Among these, low-density polyethylene having a density of 0.910 to 0.935, an ethylene-α-olefin copolymer, and an ethylene-vinyl acetate copolymer having a vinyl acetate content of 30% by weight or less have strength, transparency, and the like. It is preferable from the viewpoint of weather resistance.

In the present invention, the polyhydric alcohol constituting the antifogging agent includes polyhydric alcohols such as sorbitan, glycerin, polyethylene glycol, trimethylolpropane and pentaerythritol, and condensates thereof such as diglycerin, Polyglycerin, sorbitan / glycerin condensate, sorbitan / alkylene glycol condensate and the like can also be mentioned. The antifogging agent of the present invention includes, in addition to the above-mentioned partial ester compound of the polyhydric alcohol and the saturated fatty acid having 14 to 22 carbon atoms, an alkylene oxide adduct of the ester compound. These can be used alone or in combination of two or more. The amount of the antifogging agent 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.

[0008] As the sulfonic acid metal salt of straight-chain paraffin, a sulfone group is bonded to a secondary position of a straight-chain paraffin having 8 to 22 carbon atoms, and the metal constituting the metal salt is an alkali metal or an alkaline earth metal. Is a compound. In particular,

Embedded image As shown in the compound represented by, a sulfonic acid group is bonded to the secondary position of the linear paraffin, and the sulfonic acid groups are randomly distributed. In addition, the metal salt of a linear paraffin sulfonic acid may contain a small amount of a compound having a plurality of sulfonic acid groups. The amount of the metal sulfonate of these linear paraffins is in the range of 0.05 to 0.5 part by weight, preferably 0.1 to 0.3 part by weight. If the amount is less than 0.05 parts by weight, the anti-fogging sustaining effect is not sufficiently exhibited, and the amount of the anti-fogging effect is insufficient.
If the amount exceeds 5 parts by weight, the transparency of the film is undesirably reduced.

Further, the agricultural olefin resin film of the present invention is blended with other conventional additives such as inorganic fillers, ultraviolet absorbers, hindered amine light stabilizers, antifog agents and the like. be able to.

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 0.01 to
It is preferably about 10 μm.

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-based light stabilizer include those described in JP-A-1-197543 and JP-A-2-30529. 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.

[0013] 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, a coloring agent and the like 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.

In order to prepare the agricultural olefin resin film 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. Thereafter, a film can be formed by a normal forming method such as inflation processing and T-die processing.

Such a film may be a single layer, but may be a laminated film formed by co-extrusion blown molding in view of dustproofness, flexibility and strength. Also, it may be transparent, satin or semi-pear, and the thickness of the film is
If it is too thin, the strength becomes insufficient, which is not preferable. On the other hand, if it is too thick, it causes inconvenience in film forming work and the like.
It is selected in the range of 4 to 0.15 mm.

[0017]

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 a temperature of 10 ° C., and the state of adhesion of water droplets on the inner surface of the film was observed. A: Water droplets hardly adhered. ：: Water droplets are slightly attached. 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

Example 1 An antifogging agent comprising 1 part by weight of sorbitan monopalmitate and 1 part by weight of glycerin monostearate per 100 parts by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate unit content of 5% by weight and the number of carbon atoms 16 linear paraffin sulfonic acids N
The composition containing 0.1 part by weight of a was supplied to an inflation molding apparatus to obtain a film having a thickness of 0.1 mm and a width of 60 cm. Table 1 shows the results of the evaluation test.

Example 2 The procedure of Example 1 was repeated, except that a straight-chain paraffin having 14 carbon atoms, Na sulfonate, was used in place of the sodium salt of a linear alkyl sulfonate having 16 carbon atoms. A film having a thickness of 0.1 mm and a width of 60 cm was obtained. Table 1 shows the results of the evaluation test.

Example 3 In Example 1, 1.5 parts by weight of a 1-mol propylene oxide adduct of sorbitan monostearate was used in place of the antifogging agent consisting of 1 part by weight of sorbitan monopalmitate and 1 part by weight of glycerin monostearate. Thickness 0.1 mm, width 60 in the same manner as in Example 1 except that
cm of film was obtained. Table 1 shows the results of the evaluation test.

Example 4 A film having a thickness of 0.1 mm and a width of 60 cm was obtained in the same manner as in Example 3 except that 0.2 parts by weight of Na parasulfonic sulfonate having 16 carbon atoms was used. Was.
Table 1 shows the results of the evaluation test.

COMPARATIVE EXAMPLE 1 A film having a thickness of 0.1 mm and a width of 60 cm was obtained in the same manner as in Example 1 except that Na sulfonate, a linear paraffin having 16 carbon atoms, was not added. Table 1 shows the results of the evaluation test.

Comparative Example 2 A film having a thickness of 0.1 mm and a width of 60 cm was obtained in the same manner as in Example 3, except that Na sulfonate, a linear paraffin having 16 carbon atoms, was not added. Table 1 shows the results of the evaluation test.

Comparative Example 3 The procedure of Example 3 was repeated except that 1.0 part by weight of Na sulfonate, a linear paraffin having 16 carbon atoms, was added.
In the same manner as in the above, a film having a thickness of 0.1 mm and a width of 60 cm was obtained. Table 1 shows the results of the evaluation test.

[0026]

[Table 1]

[0027]

The olefin resin film for agriculture of the present invention is excellent in transparency and antifogging durability, and is suitable as a coating material for house cultivation and tunnel cultivation.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-238029 (JP, A) JP-A-8-142285 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01G 9/14 A01G 13/02

Claims (2)

(57) [Claims] Claims: 1. An amount of olefin resin is 100 parts by weight.
An antifogging agent comprising a partial ester compound of 1 to 4 parts by weight of a polyhydric alcohol and a saturated fatty acid having 14 to 22 carbon atoms;
An agricultural olefin resin film comprising 0.05 to 0.5 parts by weight of a metal salt of a linear paraffin sulfonic acid. 2. The straight-chain paraffin sulfonic acid metal salt has a sulfonate group bonded to a secondary position of the straight-chain paraffin having 8 to 22 carbon atoms, and the metal constituting the metal salt is an alkali metal or an alkaline earth metal. 2. The olefin resin film for agricultural use according to claim 1, which is a compound which is a kind of metal.