JPH1033A - Olefin-resin based coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an olefin-resin based coating material, excellent in transparency and the durability of fog resistance, and suitable for growth in greenhouse, etc., by compounding an olefin resin with a specific anti-fogging agent and a polyethylene-containing phosphoric acid ester compound at a specific ratio. SOLUTION: This coating material is obtained by compounding (A) 100 pts.wt. of an olefin resin such as a polyethylene, (B) 1-4 pts.wt. of an anti-fogging agent consisting of a partial ester compound of a polyhydric alcohol such as sorbitan with a 14-22C saturated fatty acid such as palmitic acid and (C) 0.05-0.5 pt.wt. of a polyethylene-containing phosphoric acid ester of a compound of formula I [X is H, a 1-18C alkyl or an alkali metal; (l), (m) and (n) are each 0-10; (l)+(m)+(n)=1-15] or formula II (Y is an alkaline earth metal), etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an olefin resin coating material. More specifically, the present invention relates to an olefin resin coating material having good 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]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an agricultural film having improved antifogging property for a long time in a material coated with an olefin resin.

[0005]

The gist of the present invention is to provide an antifogging agent comprising 1 to 4 parts by weight of a nonionic surfactant per 100 parts by weight of an olefin resin, and 0.05 to 0.5 part by weight. An olefin-based resin-coated material characterized by blending with a polyoxyethylene-containing phosphate compound in parts by weight.

[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. 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 antifogging agent comprising a partial ester compound of the above polyhydric alcohol and a saturated fatty acid having 14 to 22 carbon atoms of the present invention includes an alkylene oxide adduct of these partial esters.

Specific examples of the antifogging agent of the present invention include sorbitan monopalmitate, sorbitan monostearate,
Sorbitan surfactants such as sorbitan monomyristate, sorbitan monobehenate, esters of sorbitan / glycerin condensates with fatty acids, esters of sorbitan / alkylene glycol condensates with fatty acids, or alkylene oxide adducts thereof; glycerin Glycerin-based surfactants such as monopalmitate, glycerin monostearate, glycerin sesquipalmitate, diglycerin monopalmitate, diglycerin sesquistearate, triglycerin distearate and alkylene oxide adducts thereof; polyethylene glycol monostearate And polyethylene glycol surfactants such as polyethylene glycol monopalmitate; trimethylolpropane such as trimethylolpropane monopalmitate Surface active agents; pentaerythritol-based surfactants such as pentaerythritol monopalmitate and the like, which can be used in combination alone, or two or more kinds. 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. When the amount is less than 1 part by weight, the antifogging property is not sufficiently exhibited, and when the amount exceeds 4 parts by weight, bleed out is easily caused,
This is not preferred because the transparency of the film is reduced.

As the polyoxyethylene-containing phosphate compound,

Embedded image (Wherein X in the formula is each independently a hydrogen atom,
An alkyl group of 8 and an alkali metal, l, m, and n are each an integer of 0 to 10, and l + m + n = 1 to 1
5) or

Embedded image (Y in the formula is an alkaline earth metal, l, m, and n are each an integer of 0 to 10, and l + m + n = 1 to 1
5). Specifically, preferred compounds include

Embedded image

Embedded image

Embedded image And the like. The compounding amount of these polyoxyethylene-containing phosphate compounds is 0.05 to
0.5 parts by weight, preferably 0.1 to 0.3 parts by weight. If the amount is less than 0.05 part by weight, the anti-fogging sustaining effect is not sufficiently exhibited, and if it exceeds 0.5 part by weight, the transparency of the film is undesirably reduced.

Further, the olefin resin coating material of the present invention may contain other conventionally used additives such as inorganic fillers, ultraviolet absorbers, hindered amine light stabilizers, antifog agents and the like. Can be.

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.

[0014] 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.

In order to prepare the olefin resin coating material of the present invention, various additives such as the above-mentioned anti-fogging agent are blended at predetermined ratios with the base resin, and kneaded to prepare a resin composition. The film can be formed by a normal forming method such as inflation processing, T-die processing, and the like.

Such a film may be a single layer, but may be a laminated film formed by coextrusion blown molding from the viewpoints 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 filming work and the like, so it is generally 0.02 to 0.3 mm, preferably 0.02 to 0.3 mm.
It is selected in the range of 4 to 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. 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 anti-fogging agent comprising 1 part by weight of sorbitan monopalmitate and 1 part by weight of glycerin monostearate and 100 parts by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate unit content of 5% by weight and Compound A The composition containing 0.1 part by weight of the polyoxyethylene-containing phosphate compound was supplied to an inflation molding apparatus, and the thickness was 0.1 mm and the width was 60 c.
m of film was obtained. Table 1 shows the results of the evaluation test.

Example 2 The same procedure as in Example 1 was repeated except that the same amount of the polyoxyethylene-containing phosphate compound of Compound B was used in place of Compound A in Example 1, and the thickness, 0.1 mm, and width were used. 60
cm of film was obtained. Table 1 shows the results of the evaluation test.

Example 3 An antifogging agent and a compound comprising 1.5 parts by weight of a 1-mol propylene oxide adduct of sorbitan monostearate with 100 parts by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate unit content of 5% by weight The composition containing 0.1 part by weight of the polyoxyethylene-containing phosphate compound B was supplied to an inflation molding apparatus, and the composition was 0.1 mm thick and 60 mm wide.
cm of film was obtained. Table 1 shows the results of the evaluation test.

Comparative Example 1 The procedure of Example 1 was repeated except that the polyoxyethylene-containing phosphate compound of Compound A was not used.
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.

Comparative Example 2 Example 3 was repeated except that the polyoxyethylene-containing phosphate compound of Compound B was not used.
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.

Comparative Example 3 The procedure of Example 3 was repeated, except that the polyoxyethylene-containing phosphate compound of Compound B was mixed in an amount of 1.0 part by weight.
Film was obtained. Table 1 shows the results of the evaluation test.

[0027]

[Table 1]

Example 4 Antifogging consisting of 1.0 part by weight of sorbitan monopalmitate and 1.0 part by weight of glycerin monostearate per 100 parts by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate unit content of 15% by weight. An extruder was used to prepare pellets for an intermediate layer from a composition prepared by mixing the agent and 0.1 part by weight of the polyoxyethylene-containing phosphate compound of compound B. next,
A composition in which 1.0 part by weight of sorbitan monopalmitate and 1.0 part by weight of glycerin monostearate are blended with 100 parts by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate unit content of 5% by weight. Was formed into pellets for a surface layer 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. Obtained. The evaluation of this film showed that the antifogging property after 14 days was good and almost no water droplets adhered.
The AZE value was good at 37%.

[0029]

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

Claims (2)

[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 olefin-based resin-coated material comprising 0.05 to 0.5 parts by weight of a polyoxyethylene-containing phosphate compound. 2. The polyoxyethylene-containing phosphate compound according to claim 1, (Wherein X in the formula is each independently a hydrogen atom,
An alkyl group of 8 and an alkali metal, l, m, and n are each an integer of 0 to 10, and l + m + n = 1 to 1
5) or (Y in the formula is an alkaline earth metal, l, m, and n are each an integer of 0 to 10, and l + m + n = 1 to 1
5. The olefin-based resin-coated material according to claim 1, which is a compound represented by the following formula: