JPS61133244A - Synthetic resin film - Google Patents

Abstract

PURPOSE:A film having improved haze preventing effect and its durability as an agricultural covering film and improved weather resistance free from adhesion between films, comprising a synthetic resin containing a specific surface active agent. CONSTITUTION:A synthetic resin film having a fluorine-containing surface active agent shown by the formula I [Rf is 3-21C fluorine-containing aliphatic group; R1 is H, or 1-3C acyl; R2 is group shown by the formula II or III; R3 is H, 1-18C alkyl or unsaturated alkyl (with the proviso that 1-3C alkyl is omitted when R1 is H), 1-18C acyl or unsaturated acryl; R4 is 5-10C alkyl; m is 1-30; n is 1-30 (5-15 is omitted when R1 is H]. This film is preferably used with an antiseptic, an amount of the antiseptic is 1.0-5.0pts.wt. based on 100pts.wt. synthetic resin, and an amount of the surface active agent is 0.01-0.2pt.wt.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a synthetic resin film, and more specifically, it is made of a synthetic resin containing a specific fluorine-containing surfactant, and is used to reduce moisture in an enclosed space. The present invention relates to a synthetic resin film, particularly an agricultural synthetic resin film, which reduces the occurrence of chlorophyll and has excellent sustainability of its effect.

[Prior Art] In recent years, greenhouse cultivation has enabled a stable supply of various vegetables and fruit trees throughout the year.

Synthetic resin films such as polyvinyl chloride and polyethylene are widely used as covering materials for greenhouses.

The original purpose of a greenhouse is to maintain the temperature essential for the growth of cultivated crops, that is, to keep them warm. In order to improve heat retention, it is necessary to improve the degree of sealing of the greenhouse and suppress the amount of heat that escapes through ventilation.

Recently, there has been a growing trend towards energy conservation, and there are many ways to utilize solar energy as long as it does not adversely affect the crops in greenhouses.
As much as possible, 11. -Management techniques that increase the degree of airtightness of rooms are becoming more and more popular. By implementing this management technique, the environment within the greenhouse tends to become humid to a conventional level, and at the same time, there is a problem in that the amount of mist generated within the greenhouse increases significantly. Moya is said to be closely related to the pests and diseases of cultivated crops and to the quality of the harvest, and must be avoided as much as possible in greenhouse cultivation.

Moya is basically caused by the condensation of water vapor inside the greenhouse, and is a phenomenon that often occurs in the morning and evening when the temperature difference inside and outside the greenhouse changes rapidly. Moya can be eliminated by ventilating the air inside and outside the greenhouse. However, since the heat retention of greenhouses is generally emphasized, ventilation is often the only option available, which has been a major problem in greenhouse cultivation.

Since the occurrence of mist is essentially a phenomenon caused by moisture within the greenhouse, the occurrence of mist can be reduced by reducing the amount of moisture supplied to the atmosphere within the greenhouse. One way to prevent the occurrence of haze is to cover the soil surface inside the greenhouse with mulch material. However, covering with mulch materials is not only complicated, but also increases material costs.
This is not necessarily an advantageous method for a greenhouse grow room.

Another method for preventing haze, namely, a method for reducing the occurrence of haze by improving coating materials, was published in JP-A-55-
91663 and JP-A-57-12070 disclose a method of adding Noricon type surfactant. However, although synthetic resin films containing these substances have an anti-haze effect, they have poor adhesion between the films, which is a necessary property of coating materials, and the drop-proof property deteriorates significantly, making it difficult to maintain the anti-haze effect. It had the disadvantage of being inferior.

JP-A No. 57-14648 discloses a method of adding a fluorine-based surfactant, but when the conventional fluorine-based surfactant is added in a small amount, the effect of preventing haze is small, and it is difficult to prevent haze. The disadvantage is that the effect is not long-lasting,
When added in large amounts, there is a problem in that the adhesion between films and the weather resistance are significantly reduced.

[Structure of the Invention] The present inventors have achieved an excellent haze prevention effect and its sustainability,
In addition, the present invention was completed as a result of intensive research into a coating material that does not adversely affect other properties of the coating material, such as adhesion between films, weather resistance, drip-proofness, transparency, and slip properties. .

Synthetic resin film materials that can be used in the present invention include common synthetic resins, such as polyvinyl chloride, polyolefin, acrylic resin, polyester, and polyamide, which have film-forming properties, or blends of such synthetic resins. Among these, polyvinyl chloride resins and polyethylene resins are particularly preferred from the viewpoint of weather resistance, economical efficiency, and light transmittance. Vinyl resin is most preferred. As the polyvinyl chloride resin, a vinyl chloride homopolymer and a copolymer with vinyl acetate, ethylene, propylene, alkyl vinyl ether, etc. can be used.

As other additives added to the synthetic resin, commonly used plasticizers, stabilizers, lubricants, fillers, ultraviolet absorbers, antistatic agents, antioxidants, etc. can be used. There are no restrictions.

The fluorine-containing surfactant used in the present invention has the general formula: % formula % [wherein Rf is a C3 to CZ+ fluorine-containing aliphatic group, R1
is hydrogen or an acyl group of C3 to C3, R7 is ÷(C, R3 is hydrogen, an alkyl group of C,-'-C,, or an unsaturated alkyl group (however, when R is hydrogen, an acyl group of 01 to C3 ) or an acyl group or unsaturated acyl group of C+-C+e, R4 is an alkyl group of Cs' to COO, m
is 1-30. n is 1 to 30 (excluding 5 to 15 when R is hydrogen). ] is shown. In the above general formula, the fluorine-containing aliphatic group may be either saturated or unsaturated, and may be linear or branched.

Specific examples of these fluorine-containing surfactants are as follows: CeF 13CH7CIlCH20((Cllt)zO
) sH(1)i1 C,F, 3CH2CHCH20((CI,) 20
) aH(2)COCH3 C,F,7CI,CIICII,O((C11,)20
) 13cH3(3)OCOC113 C,F,,CI,CIC11,0((CH,)20)e
cOc)! , (4) HCH3 C,F,,C1f,CHO((CI,)to),C0C
=CF12 (5)C9F, -CHtCHC
H*O((C112) 20 ) sH(6)CH C=F 17C1ltCHCHtO((CHJ to
) all (7) C+oF2+CHtC
HCHtO((cttt)to) IJ (8
)O1+ ■ C+2FzsC)ItCHCHzO((CI,)to
) 1sH(9)CH C+ tF 2scIIzcHc)IzO((CH2)
20) 1sCIdlys (10) The amount of the fluorine-containing surfactant ([) added is preferably 0.01 to 0.2 parts by weight per 100 parts by weight of the synthetic resin when used in combination with the drip-proofing agent below. If it is less than 0.01 part by weight, the anti-haze effect will be small, while if it is added in an amount of 0.2 parts by weight or more, no improvement will be seen in the anti-haze effect or its sustainability, but rather the weather resistance will tend to deteriorate.

On the other hand, conventionally used fluorine-containing surfactants include C8F, , C00NH,, C,F, 7SO
3K, sex agent, C,F, ,So,N(C,H,)C,
There are nonionic surfactants such as 11,0(C,H,O)□H1, but these conventional fluorine-containing surfactants are On the contrary, if 0.2 parts by weight or more is not added, a satisfactory anti-haze effect cannot be obtained, and its sustainability is also poor. Furthermore, the adhesion between films and weather resistance are also poor.

Of course, the film-containing surfactant (D) used in the present invention has excellent drip-proofing and haze-preventing effects even when used in small amounts compared to the above-mentioned conventional Rano, and is effective even without using a drip-proofing agent.

In the present invention, as the drip-proofing agent that is preferably used together with the fluorine-containing surfactant, any surfactant that can impart drip-proofing properties to the synthetic resin film can be used. Active agents are preferably used. Specific examples of these include (A) ether-type esters such as borioquinoedylene alkyl ether, polyoxyethylene alkylaryl ether, and polyoxyethylene polyoxopropylene ether; (B) polyoxyethylene alkyl ester, polyhydric Ester-type products such as partial esterification products of alcohol and fatty acids, (C)1'! Aminoether type products such as lyoxyethylene alkylamine,
(D) polyoxyethylene sorbitan fatty acid ester,
Examples include ether ester types such as polyoxyethylene sorbitol fatty acid ester, polyoxyethylene mannitan fatty acid ester, polyoxyethylene glyceryl fatty acid ester, and polyoxyethylene propylene glycol monofatty acid ester. These nonionic surfactants can basically be selected arbitrarily, but preferably they have properties such as moldability, heat resistance, transparency, etc. in addition to drip-proofing properties, It is desirable that the performance as an agricultural liquid cover material is fully satisfied. Examples of nonionic surfactants suitable for obtaining the above performance include (1) sorbitan, sorbitol, mannitan,
Partial ester of polyhydric alcohol such as mannitol, glycerin, diglycerin, and fatty acid having 12 to 22 carbon atoms (11) The number of moles added of edile/oxide or propylene oxite is 1 to 20, and the polyhydric alcohol is sorbitan, sorbitol, Mannitan, glycerin, diglycerin, polyoxynoalkylene polyhydric alcohols whose fatty acids have 12 to 22 carbon atoms, and mixtures of fatty acid esters (iii) (i) (1i) can be mentioned.

These drip-proofing agents are usually added in an amount of at least 0.5 parts by weight, preferably in the range of 10 to 50 parts by weight, based on 111,100 parts by weight of the synthetic tree. If the amount added is less than 0.5 parts by weight,
A sufficient drip-proofing effect cannot be obtained, and if it exceeds 50 parts by weight, there is a tendency for a large amount of bleeding, water absorption, whitening, and a decrease in transparency to be undesirable.

[Effects of the Invention] As described above, since the saturated synthetic resin film is made of a synthetic resin containing the above-mentioned fluorine-containing surfactant (I), preferably together with a drip-proofing agent, it has an anti-haze effect. It is remarkable and its durability is also excellent. Furthermore, since the fluorine-containing surfactant ([) exhibits the desired effect even when added in a small amount, it has almost no negative effect on the adhesion and weather resistance between films, and the synthetic resin film of the present invention is suitable for agricultural use. It has extremely high utility value as a covering material.

[Preferred Embodiments of the Invention] Next, the present invention will be explained in more detail by showing Examples and Comparative Examples.

The haze evaluation method, drip-proof evaluation method, weather resistance evaluation method, and film adhesion evaluation method in Examples and Comparative Examples are as follows.

Moya evaluation method: The films obtained in each example and each comparative example were spread separately in a tunnel-shaped greenhouse with a width of 1+n and a height of 0.9 mS @ line tOI11, and the occurrence of mist was observed in the morning and evening. Evaluated according to the following criteria: ○: No haze at all. Slight haze △ Slightly hazy × - Very much haze Drip-proof evaluation method In the above-mentioned tunnel-shaped greenhouse, whether the drip-proof condition is good or not was observed with the naked eye and evaluated using the following criteria: ○ Drip-proofing is very good. Dripping-proofing is good. △ Dripping-proofing is poor. X Dripping-proofing is very poor. The deterioration status was observed with the naked eye and evaluated using the following criteria.

○: No discoloration at all Some discoloration can be seen on the log △ Discoloration can be seen on about half of the area × Discoloration or gloomy on the entire area Film adhesion evaluation method After film production, two films left at room temperature for 6 months were subjected to high frequency treatment. The film was adhered with Minon and pulled until it was cut, and the adhesive strength was evaluated based on the following criteria.

O: The adhesive part is not peeled off at all and the film is torn.

Δ, about 1/2 of the adhesive part is peeled off. ×: The entire adhesive part is peeled off. Examples 1 to 8 and Comparative Examples 1-13 Weirmoto formulation Part by weight vinyl chloride resin (degree of polymerization +300) to.

Dioctyl phthalate 44 Tricresyl phosphate 6 Eboxy resin
2Ba-Zn stabilizer
2 methylene bisstearamide
0.1 Ultraviolet absorber 0.
1 For the above basic formulation, fluorine-containing surfactants, nonionic surfactants, and silicone surfactants may be added alone or in combination in the proportions shown in Table 1 (4 parts by weight per 100 parts by weight of vinyl chloride resin). ) and calender-molded into a film with a thickness of O and I mm, and the resulting film was subjected to a Moya test, a drip-proof test, a paternity test, and a film adhesion test, and evaluated according to the above criteria. . The results are shown in Table 2.

As is clear from the results in Table 2, the film of the present invention has excellent anti-haze effect and durability, and is superior in weather resistance and film adhesion by 4", making it an extremely useful synthetic resin film, especially for agricultural use. It's a film.

Claims (1)

[Claims] 1. General formula: ▲ Numerical formulas, chemical formulas, tables, etc.
is − [(CH_2)_2O] −_mR_3 or ▲ formula,
There are chemical formulas, tables, etc.
Exclude alkyl groups from _1 to C_3. ) or C_1 to C_
1_8 acyl group or unsaturated acyl group, R_4 is C_5
~C_1_0 alkyl group, m is 1-30, n is 1-3
0 (excluding 5 to 15 when R_1 is hydrogen). ] A synthetic resin film characterized by containing a fluorine-containing surfactant represented by the following. 2. The synthetic resin film according to claim 1, wherein the synthetic resin further contains a drip-proofing agent.