JPH01225651A - Agricultural covering material - Google Patents

Abstract

PURPOSE:To make it possible to prevent dew condensation on an agricultural covering material, to improve its mist-preventing property and to retain this excellent property for a long time, by preparing said material from a mixture of a vinyl chloride resin with a nonionic surfactant and a specified fluorine compound. CONSTITUTION:This agricultural covering material comprises 100pts.wt. vinyl chloride resin, at least 0.5pt.wt. nonionic surfactant (a) and 0.01-1.0pt.wt. fluorine compound having an HmCnF2n+1-m group and/or an HmCnF2n-1-m group (b) (wherein m is an integer of 1-3, and n is an integer of 3-20), and is in the form of a sheet or a film. It is desirable that the vinyl chloride resin has an average degree of polymerization of 1,100-2,500.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an agricultural covering material used for covering agricultural tunnels, simple greenhouses, etc.

[Conventional technology and Problems that the invention seeks to solve]

Vinyl chloride resin films or sheets are widely used as covering materials for agricultural tunnels, simple greenhouses, etc. because they are inexpensive, transparent, and have excellent heat retention and strength. When used in tunnels, simple greenhouses, etc., there is a problem in that dew condensation occurs on the inner surface of the coating material, which prevents sunlight from passing through. For this reason, in the past, surfactants were added to the vinyl chloride resin to increase the hydrophilicity of the surface of the vinyl chloride resin film or sheet, improve the surface wettability, and ensure that the surface was uniformly wetted. Condensation on the surface of the coating material is prevented by allowing the generated water droplets to flow down quickly, but when a surfactant is added, condensation does not occur, but instead fog is generated near the inner surface of the coating material, and this There was a problem in that the fog prevented sunlight from passing into the tunnel and the simple greenhouse. In order to solve such problems, conventionally, a fluorine-based surfactant having a perfluoroalkyl group or a perfluoroalkenyl group is added to the vinyl chloride resin together with a surfactant.

However, although such coating materials have excellent initial fog-proofing properties, they have a problem in the durability of fog-proofing performance, and have the disadvantage that fog-proofing properties deteriorate in a relatively short period of time.

[Means to solve the problem]

As a result of extensive research in order to solve the above problems, the present inventors have found that by adding a specific amount of a nonionic surfactant and a fluorine compound with a specific structure to a vinyl chloride resin, dew condensation can be prevented. The inventors of the present invention have completed the present invention by discovering that not only can the anti-fog property be prevented and the anti-fog property is excellent, but also that the excellent anti-fog performance can be maintained over a long period of time.

That is, in the present invention, per 100 parts by weight of vinyl chloride resin,
0.5 parts by weight or more of a nonionic surfactant and H@CnF
Fluorine compound having ln*+-wh group and/or H
, C, 'F z-+-=& (where m is an integer of 1 to 3, n is an integer of 3 to 20) 0.01
The gist of the present invention is an agricultural covering material characterized in that it contains 1.0 parts by weight and is formed into a sheet or film.

In the present invention, vinyl chloride resins include polyvinyl chloride and copolymers of vinyl chloride and other monomers, and other monomers copolymerizable with vinyl chloride include, for example, ethylene, propylene, vinyl acetate, and chloride. vinylidene, acrylic acid and acrylic esters, methacrylic acid and methacrylic esters, maleic acid, fumaric acid,
Examples include acrylonitrile. In the case of a copolymer, it is preferable that the vinyl chloride component is contained in an amount of 90% by weight or more. This vinyl chloride resin has an average degree of polymerization of m00 to 250.
0 is preferred.

In the present invention, 0.5 parts by weight or more, preferably 0.5 to 4 parts by weight, particularly preferably 1 to 3 parts by weight of a nonionic surfactant is added per 100 parts by weight of the vinyl chloride resin. Nonionic surfactants include sorbitan fatty acid ester, sorbitol fatty acid ester, diglycerin fatty acid ester, glycerin fatty acid ester, sorbitan fatty acid/dibasic acid ester, sorbitol fatty acid/dibasic acid ester, diglycerin fatty acid/dibasic acid ester, glycerin Examples include esters of polyhydric alcohols and fatty acids such as fatty acid/dibasic acid esters, esters of polyhydric alcohols, fatty acids, and dibasic acids, and those to which alkylene oxide is added. Among them, esters with fatty acids having 12 to 22 carbon atoms, or esters of these fatty acids and dibasic acids, etc., include sorbitan palmitate, sorbitan stearate, and sorbitan stearate/ethylene oxide 3 mole adduct. , sorbitan palmitate/propylene oxide 2 mole adduct, sorbitol stearate, sorbitol stearate/ethylene oxide trivalent adduct, diglycerin palmitate, diglycerin stearate, glycerin palmitate, glycerin stearate, glycerin palmitate. 2 mol ethylene oxide adduct, sorbitan stearate adipate/propylene oxide 1 mol adduct, sorbitol stearate adipate/3 mol ethylene oxide/3 mol propylene oxide adduct, diglyceryl palmitate sebacate/propylene oxide 2 mol adduct , sorbitol palmitate adipate propylene oxide 3
Examples include molar adducts. These nonionic surfactants can be used alone or in combination of two or more.

In addition to the above-mentioned nonionic surfactant, the agricultural coating material of the present invention contains 0.01-1% per 100 parts by weight of vinyl chloride resin.
．． 0 parts by weight, preferably 0.05 to 0.5 parts by weight of a fluorine compound is added. The above-mentioned fluorine-based compounds used in the present invention include H, C, and F. It is a fluorine compound having a 1-1 group or a fluorine compound having a HIIcRF Zn-1-m group. Examples of such fluorine-based compounds include compounds represented by the following formulas.

(a) Rf (CI+ri -01l (b) Rf (C1lt) -0(R+O) bRz(C
)Rf(C1h)-C1l(Qlh)CIItO(R+
0) Jt(d)RfBN(R,0),R.

However, in the above formula, Rf is H, CnF , , -, L,
u, or H@CyI F tn-1-a group (m is 1
~3 integer, n is an integer from 3 to 20), B is CO or SO
t group, R1 is Cz Ha or C, l+6 group, R2 is H or Cmz, Czlls, phC, H,, COR5 (
Rs is an alkyl group having 1 to 18 carbon atoms), P is H or a Cl1z or Czlls group, and -ad are each an integer of 1 to 10.1 to 30.1 to 10.1 to 10. .

The amount of the fluorine-based compound added is 100% of the vinyl chloride resin.
If it is less than 0.01 parts by weight, there will be no fog-proofing effect, and if it exceeds 1.0 parts by weight, it will cause blistering and poor weather resistance.

Additives such as plasticizers, stabilizers, and stabilizing aids can be added to the coating material of the present invention, if necessary.

Examples of the plasticizers include phthalate plasticizers, phosphate plasticizers, and epoxy plasticizers.

Examples of phthalate ester plasticizers include dibutyl phthalate, didodecyl phthalate, di-n-octyl phthalate, diisooctyl phthalate, di-2-ethylhexyl phthalate, dinonyl phthalate, diisononyl phthalate, diisodecyl phthalate, didodecyl phthalate, Examples include diisodecyl phthalate, ditridecyl phthalate, butylbenzyl phthalate, and the like. Examples of the phosphoric acid ester plasticizer include triodyl bosphate, triphenyl phosphate, tricresyl phosphate, tricylenyl phosphate, diphenyloctyl phosphate, diphenyl cresyl phosphate, triethylphenyl phosphate, and the like. Examples of epoxy plasticizers include epoxidized fish oil, epoxidized linseed oil, epoxidized fish oil, epoxidized castor oil, epoxidized flower oil, epoxidized tall oil fatty acid ester, epoxidized linseed oil fatty acid ester, and epoxidized middle fat oil. , epoxidized polybutadiene, methyl epoxy stearate, butyl epoxy stearate, 2-ethylhexyl epoxy stearate, stearyl epoxy stearate, tris(epoxypropyl) isocyanurate, 3-(2-xenoxy)-1,2-epoxy Examples include propane, bisphenol A diglycidyl ether, vinyl dichlorohexene dieboxide, and a polycondensate of 2,2-bis(4-hydroxyphenyl)propane and epichlorohydrin. The above-mentioned plasticizers may be used alone or in a mixture of two or more, but the preferable addition amounts are 30 to 70 parts by weight of phthalate plasticizers and 30 to 70 parts by weight of phthalate plasticizers, and 30 to 70 parts by weight of phosphate plasticizers per 100 parts by weight of vinyl chloride resin. 1 to 7 parts by weight, and 0.5 to 7 parts by weight for the epoxy plasticizer.

As the stabilizer, one or two of diptyltin dilaurate, dibutyltin maleate ester, dioctyltin mercaptide, calcium stearate, barium stearate, zinc stearate, calcium laurate, barium ricinoleate, calcium oleate, zinc octoate, etc. The above is used. Stabilizing aids include triphenyl phosphite, dioctyl phenyl phosphite, tris(nonylphenyl) phosphite, diphenylisodecyl phosphite, trilauryl trithiophosphite, diphenyl acid phosphite, dioctyl acid phosphite, etc. , these stabilizing aids can also be used alone or in combination of two or more.

Furthermore, if necessary, ultraviolet absorbers such as benzotriazole type, benzophenone type, and salicylic acid type, antistatic agents such as polyoxyethylene alkylamine, polyglycol ether, and sodium p-styrene sulfonate, antioxidants, coloring agents, etc. Additives may also be added as appropriate.

The agricultural covering material of the present invention is formed into a film or sheet, and the thickness thereof is preferably about 0.03 to 0.3 mm.

〔Example〕

The present invention will be explained in more detail with reference to Examples below.

Examples 1 to 6, Comparative Examples 1 to 7 Using the fluorine-based compounds shown in Table 1, the following formulations were charged into a Henschel mixer, stirred and mixed for 10 minutes, then melted by heating at 180'C and kneaded with rolls. Then, it was formed into a film having a thickness of 0 mm using a calender. Each film is placed in a pipe house (area 250m)
, 2.5 m in height) and used as a covering material on October 1st.
The occurrence of fog was observed from January 31st to January 31st of the following year.

The results are also shown in Table 1.

Gold polyvinyl chloride 100 parts by weight Dioctyl phthalate 45 parts by weight Epichlorohydrin epoxy resin 2 parts by weight Tricresyl phosphate 5 parts by weight Barium
Zinc-based liquid stabilizer 2 parts by weight Barium-zinc powder stabilizer 1 part by weight Sorbitan monopalmitate
1 part by weight 2 mole adduct of sorbitan stearate/ethylene oxide 1 part by weight benzophenone ultraviolet absorber 0.2 part by weight fluorine compound
Listed in Table 1 *1 Fog resistance: ◎... No fog is generated at all.

○...A faint fog appears.

Δ: Slightly dense fog occurs.

×...Dense fog occurs.

It was judged as.

[Effects of the Invention] As explained above, the agricultural coating material of the present invention contains 0.5 parts of nonionic surfactant per 100 parts by weight of vinyl chloride resin.
2% by weight of HIIICIIF, 0.01 to 1.0 parts by weight of a fluorine-based compound having a 1-s group and/or a fluorine-based compound having a H@C@F L, -1-am group. By adding
In addition to preventing dew condensation on the surface of the coating material, it also has an excellent fog-proofing effect, and unlike conventional products, there is no risk of the fog-proofing property decreasing in a short period of time, and the excellent fog-proofing property remains for a long period of time. It has the effect of being maintained.

Claims (1)

[Scope of Claims] 0.5 parts by weight or more of a nonionic surfactant per 100 parts by weight of vinyl chloride resin, and a fluorine compound having H_mC_nF_2_n_+_1_-_m group and/or H_mC_nF_2_n_-_
Fluorine compounds having 1_-__m groups (where m is 1 to
3, n is an integer of 3 to 20) 0.01 to 1.0 parts by weight, and is formed into a sheet or film shape.