JPS58196284A - Antifouling covering material for agriculture - Google Patents

Abstract

PURPOSE:An antifouling covering material for agriculture, to which mud and dusts in air are slightly attached, slightly being stained and becoming dark, having high sunlight transmittance efficiency, obtained by forming a film of a fluorine compound shown by a specific formula on the surface of an agricultural covering material. CONSTITUTION:A film of a fluorine compound shown by the formula I [X is F, or perfluoroalkoxy containing 1-6F; m is 2-20; W is group shown by the formula II (R is H, 1-14C hydrocarbon, aryl, aralkyl, etc.), (cyclo)alkylene, or alkylene oxy; n=0 when W is group shown by the formula II, and n is 0 or 1 when W is other than it; Y is 2-20C (cyclo)alkylene, etc., containing two or more C in the main chain; Z is O or N, p is 1 when Z is 0, and p is 2 when Z is N; r and q are >=1, and r+q=4; B is group shown by the formula III (R' is H or methyl; Q is halogen, etc.), etc.; X(CF2)m and Y are straight-chain, branched- chain, or cyclic] is formed on the surface of an agricultural covering material consisting of preferably polyethylene terephthalate resin film, to give the desired covering material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to agricultural covering materials, and more specifically, the present invention relates to agricultural covering materials, and more specifically, the ability to suppress stains and darkening on the surface during use by having a fluorine compound on the surface. This is an agricultural covering material made of synthetic resin that has the following properties:

In recent years, in order to increase the marketability and productivity of agricultural crops through forced, semi-forced or suppressed cultivation, so-called greenhouse cultivation and tunnel cultivation, in which useful crops are grown under agricultural covering materials, have become popular. It has been effective.

However, since greenhouse cultivation and tunnel cultivation are usually carried out outdoors on farmland, mud and dust in the air easily adhere to the surface of agricultural covering materials, causing stains and darkening, making them difficult to use. Over time, this dirt and rot accumulates, reducing the transmission of sunlight, which is essential for crop growth, and effectively reducing the useful life of agricultural coverings.

In order to solve this problem, the present inventors have conducted intensive studies and found that the desired antifouling effect can be obtained when a compound represented by the following general formula is applied to an agricultural film.
The pressure of the present invention has been reached.

That is, the present invention relates to a fluorine compound represented by the following general formula CI) (1) (where X is fluorine or a perfluoroalkoxy group containing 1 to 6 fluorine atoms) is a hydrocarbon group, aryl group, or aralkyl group, hydroxyalkyl group with an arithmetic mean of CI ~ 14), or in other cases of alkylene, cycloalkylene, alkyl, t*Fio or #i
It is i.

Y is an alkylene/, cycloalkylene, or alkyleneoxy group consisting of 2 to 20 leg atoms and containing at least 2 carbon atoms in the main chain.

If zFi is oxygen or nitrogen and 2 is acid, p#i1, Z
If is nitrogen, p is 2.

r and qFi are at least engineering integers, and the sum of r+q is 4. B is -C R'CHOH, -C for R'CHOC to R'CHOH, or -C Peng CH(OH)CH@Q.

-CHICH(OR)C)40CHaCH(OH)C)
fmQ, in which R' is hydrogen or a methyl group and Q is a halogen atom, a hydroxyl group or a nitrile group.

X (CF, ) and Y are a linear nine-branched chain or a cyclic substance. In addition, the substituents in the above general formula are the same or different. ) is a synthetic resin antifouling material for shipbuilding, which is characterized by having on its surface.

To explain this in detail, the gist of the present invention is to form a film of a fluorine compound defined by formula I3 on the surface of an agricultural covering material, thereby preventing mud, dirt, and dust from falling or watering. This is to facilitate the removal of such materials and to prevent the accumulation of dirt and dark spots on the surface of the coating material for the Qin industry.

Therefore, the fluorine compound used in the present invention is adsorbed onto the surface of the agricultural coating material by the B group of -COOB in 1) component 7, and easily forms a durable film. Preferred structures of group B are -CH,CI(OR)CA, -C((O
R)C for OC for CH(OH)CH@C2.

8) The perfluoroalkyl group in the molecule significantly lowers the surface free energy and exhibits excellent water and oil repellency. Because of this, mud, IK dust, etc. adhering to the paulownia wood for personnel use are easily removed as they float on the fluorine compound.

Examples of the fluorine compounds used in the present invention are as follows.

(1) Pyromellitic acid ester compound with the following structure'-1n
q, , , , , , , , (@) However, L B =
-C5cH(OH)Cl, C6n=8 (average value) (ii) Pyromellitic acid ester 68 having the following structure, where B = -cCH(OH)CtCt=8 (average value) Fluorine compound of the present invention Treatment processing by dipping, spraying, or a
It is preferable to apply the treatment liquid by a method such as -9-II contact, but since the treatment itself does not require a heat treatment step, it may be applied when the synthetic resin film is used.

Here, the treatment liquid may be in the form of a solution using acetone, dioxane, methylcarpitol, etc. as a #l medium, but from the viewpoint of safety and hygiene, an aqueous emulsion using an emulsifier is preferable.

Further, the addition of the fluorine compound (active ingredient) is not critical and may be added depending on the degree of antifouling property desired, but it is generally used in agricultural covering materials 1. / (single side) It is appropriate to set it to at least 0.12.

Furthermore, ζ, as another application aspect of the fluorine compound of the present invention,
The treatment liquid may be applied only to one side of the coating material for the ik industry, especially only to the outer surface (the surface corresponding to the outside of the house or tunnel) that requires antifouling properties. In that case, if an anti-condensation agent or a tree-blocking agent is applied to the surface of P3, its effectiveness as an agricultural coating material will be further increased.

On the other hand, the substrate for the agricultural covering material of the present invention includes a vinyl chloride resin film, an ethylene resin film, a polyester resin film, etc., and polyethylene terephthalate resin is preferred because it has a large antifouling effect.

As described above, according to the present invention, mud and dust in the air are difficult to adhere to, and therefore dirt and dark spots are less likely to adhere.
Moreover, an agricultural covering material with high sunlight transmission jM efficiency is provided.

Example 1 The ally compound used in this example has the following structure with the proviso that B =
= -C)%, CH(OH)C%C4n=8 (average value) For convenience, the compound m of the present pyromellitic acid ester is hereinafter referred to as fluorine compound composition (A).

The above fluorine compound composition [mu] and nonylphenol polyethylene oxide adduct were mixed at a total weight ratio of 6:4 to 80%
The mixture was heated to 80°C, stirred and stirred in warm water at 80°C, and then cooled to 35°C with uniform stirring. The concentration of the aqueous emulsion prepared in this way was 10 yen, and the concentration of the fluorine compound alone was 6 yen.

Next, a two-wheel stretched film of polyethylene terephthalate (thickness 100μ) was coated with the above aqueous emulsion so that the amount of the fluorine compound attached was 0.2±g per side of the film, o 3V.
//r? After spraying on both sides of the film while adjusting the amount of spraying so that

Example 1 In this example, a mixture of pyromellitic acid esters having the following structure was used as the fluorine compound.

・・・・・・・・・・・・(&) ・・・・・・・・・・・・(b) However, L B = -CI%CH(OH)CHIIC6n=
8 (average value) For convenience, the entire mixture of pyromellitic acid esters is hereinafter referred to as fluorine compound composition CB).

The above fluorine compound composition CB) was emulsified by the method described in Example 1, and the biaxially stretched polyethylene terephthalate film (
An antifouling film was prepared by depositing the fluorine compound in an amount of 0.2±0.03 t/lri per one side of the film.

Table 1K shows the results of evaluating the antifouling properties of the antifouling films prepared in Examples 1 and 2 above.

Table 1 Result of evaluation of antifouling properties of polyethylene terephthalate resin film The antifouling properties were evaluated using the following method.

l) Each piece of film, 31 on x 31 IM
Cut out 6 pieces of Tess) and fix 5 of them in a stainless steel formwork (30 cm x 30 cm). The remaining piece is stored in a clean sample box as a reference sample.

2) Put mud (moisture content: 6ochi) into an iron water tank, and add the above (
7) Fix the piece of film in a stainless steel formwork by immersing it in mud for 10 minutes, removing it from the mud, drying it completely, then washing it with water and letting it air dry.

3) Repeat 2) 10 times, 20 times, SO times, 100 times.

From the film piece after repeating 200 times, 1.5cm x
Cut out 5 sample pieces each for measurement of 3.5 crR,
The transmittance at a wavelength of 650- is measured using a Hitachi 100-20 spectrophotometer, and the average value is calculated.

Claims (2)

[Claims] (1) Fluorine compound represented by the following general formula (I)...
・・・・・・・・・・・・(1) (However,
4, a hydrocarbon group, an aryl group, an aralkyl group', or a hydroxyalkyl group. ), or Alkire/,
n = 0 in the case of cycloalkyl, n in other cases
is 0 or 1. It is an alkylene, cycloalkylene, or alkyleneoxy group consisting of 2 to 20 carbon atoms and containing at least 4.2 carbon atoms in the main chain. ZVi element, or when nitrogen and 2 are oxygen, p ke 1. When Z is nitrogen, p is 2. r and q are integers of at least 1, and the sum of r+q is 4. B is -CHIR' CHOH, -C for R'CI (Q
C Peng R'CHOH, or -CHICH(OH) C Tame Q,
--C Peng CH(OH)C〇C Peng CH(Ol()C
Peng Q, in which R' is hydrogen or a methyl group, and Q is a halogen atom, a hydroxyl group or a nitrile group. X(CFl) and Y are linear nine-branched chains or azure. In addition, the substituents in the above general formula are the same or mutually exclusive. ) on its surface. − (2) Claim No. 1, wherein the agricultural covering material substrate is a polyethylene terephthalate resin film.
Agricultural covering material according to ij.