JPS62107737A - Noxious insect evading film for agriculture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention has the effect of repelling pests from crops during crop cultivation! Ii relates to industrial film.

<Conventional technology> Conventionally, transparent or translucent polyethylene films, ethylene vinyl acetate copolymer films, and soft vinyl chloride resins have been used to grow vegetables such as fruit vegetables and leafy vegetables, flowers, and fruit trees. Films and the like have been used to cover greenhouses, tunnels, and the ground for growing crops.

This is done for the purpose of saving energy in heating the greenhouse during the cold season, and covering the ground for growing crops, generally called mulching, helps retain soil moisture, raise the soil temperature, and prevent fertilizer components from being washed away. It is done for a purpose. In recent years, with the spread and development of cover cultivation as described above, it is becoming more and more common for harmful pests to fly to cultivated crops, parasitize them, and cause great damage.
Damage caused by southern yellow thrips and VK aphids has become a serious problem in warm regions in the southwestern part of Japan, such as Shikoku, Chugoku, and Kinki.

Methods for controlling these pests have been proposed, including the use of agricultural chemicals such as repellents and insecticides, and the use of pheromones and adhesive tapes that are effective at attracting pests, such as trapping them with traps and sieves. Some of them have been put into practical use.

<Problems to be solved by the invention> However, there are still problems with these methods, for example, the use of pesticides (the resistance that develops in pests over time and the development of nasal sprays with stronger insecticidal properties). As a result of repeated use, there are inherent problems that can lead to secondary pollution such as environmental pollution, such as increased toxicity to humans and livestock and increased accumulation in soil.

As a pest control method that does not cause the above-mentioned problems, flying crops or the ground can be covered with a highly reflective solar-reflective film made by depositing a metal such as aluminum on the surface of the film, thereby controlling the arrival of pests. Methods have been proposed and put into practical use to control pests in covered houses and tunnels using methods and films that emit near-ultraviolet light. However, regarding these methods, the former has a high product cost and, although it has a high solar reflectance, it has a low light transmittance, so it is not suitable for covering greenhouses, tunnels, etc., and it is difficult to match the cultivation ground. Even in this case, the ground temperature does not rise easily, making it impractical except for special uses that take advantage of this characteristic. Although the latter has excellent pest control effects in covered greenhouses and tunnels, it has problems such as poor coloring of eggplants and flowers, which limits the crops it can be used on. Furthermore, the use of mulch has no pest control effect at all.

In view of these circumstances, the inventors have made efforts to promote the growth of cultivated crops by increasing the soil temperature of the crop cultivation ground and controlling pests that fly to and parasitize the crops. As a result of investigation, it was discovered that ultraviolet rays of a specific wavelength reflected by mica pieces coated with fine titanium oxide particles are extremely effective in pest control, and the present invention has been achieved.

That is, the present invention relates to an insect control film formed from a thermoplastic resin composition containing mica pieces coated with fine particles of titanium oxide. The present invention will be explained in detail below.

The thermoplastic resin used in the present invention is not particularly limited, but includes low-density polyethylene, high-density polyethylene, ethylene-phthene-1 copolymer, ethylene-4-methyμpentene-1 copolymer, ethylene-vinyl acetate. Copolymer, ethylene-acrylic acid copolymer, ethylene-methylmethane:-
Ethylene homopolymers and copolymers, polypropylene, vinyl chloride resin, etc., such as acrylate copolymer, ethylene vinyl acetate-methyl methacrylate copolymer, polypropylene, vinyl chloride resin, etc. can be used, and these can be used alone or It is possible to use them in combination.

The film of the present invention can be manufactured by the following steps.

A thermoplastic resin composition containing mica pieces coated with fine particles of titanium chloride can be used in a normal Banbury mixer.
jM using a two-roll kneader or extrusion kneader.
It is obtained by mixing and kneading mica pieces coated with the fine particle titanium oxide while melting the titanium oxide. The obtained resin composition can be formed into a film using a conventional film processing machine such as ink film processing, T-die film processing, or calendar processing.

Contains mica pieces coated with fine particles and titanium oxide. 'In order to obtain a bond layer film in which a transparent thermoplastic resin layer is provided on the inner surface of the resin layer, or on the inner or outer surface thereof, 2
A resin composition containing mica pieces coated with fine titanium oxide and a transparent thermoplastic resin composition are separately extruded from 92 extruders equipped with layer extrusion dies to form a two-layer film, or a three-layer extrusion machine is used to form a two-layer film. Using two extruders equipped with waste materials, the middle layer is made of 11 layers of wood containing mica flakes coated with fine titanium oxide, and a transparent thermoplastic resin layer is laminated on the inner and outer surfaces to form a three-layer film. You can.

In the case of these laminated films, the resins of the mica flake-containing film layer coated with fine titanium oxide particles and the transparent film layer may be the same or different. The content of the mica pieces coated with fine titanium oxide particles is preferably 0.5 to 20% by weight, and more preferably 1 to 5% by weight since it has high ultraviolet reflectance and does not substantially inhibit visible light transmission.

Although the film thickness is not particularly limited as it varies depending on the application, it is preferable that the film layer containing mica pieces coated with fine-particle titanium oxide has a thickness of 5 to 50J1, and the total film thickness of the laminated transparent film layer has a thickness of 10 to 1007J.

<Effects of the Invention> The film obtained as described above can be used for covering greenhouses, tunnels, and mulching the ground for crop cultivation, and has UV reflectivity at a specific wavelength, thereby preventing aphids and southern thrips. It has the effect of preventing the arrival of crop pests such as.

<Examples> Next, the present invention will be explained with reference to Examples 6, but these Examples are merely illustrative and are not limited thereto.Example 1 Low density polyethylene (density: 0.924 f/cd.

MI: 1.5Li/10 minutes) 100
Mica piece coated with particulate titanium oxide (parts by weight)
Tikabar TP650 manufactured by Teikoku Kako Co., Ltd.)
20 parts by weight Monoglycerin monostearate 0.5 parts by weight 11i Add 0.1 parts by weight of the hindered amine weathering agent Tinuvin 622 to the above formulation,
1 at a resin temperature of 150 to 160℃ using a Banbury mixer.
After kneading for 0 minutes, a granulated bento was produced using an extruder,
+. Next, a film with a thickness of 20β was obtained using a second blown film processing machine under conditions of a melting zone of 180°C and a die temperature of 180°C. The test results of film performance are shown in FIG. 1 and Tables 1-2.

Example 2 In Example 1, a film having a thickness of 20 μm was obtained using low density polyethylene in the same manner as in Example 1. The test results of film performance are shown in FIG. 1 and Tables 1-2.

Example 3 Ethylene-butene-1 copolymer (1 degree: 0.925y/
ffl, MI: 2) 710 minutes) 100 M Mica pieces coated with fine particles of titanium oxide (Ticover ZyTP650 Teikoku Kako Co., Ltd.) 8.01 parts Monoglycerol monostearate 2.0 parts by weight To the above formulation A mixed resin A was obtained in the same manner as in Example 1 by adding 0.1 part by weight of the hindered amine weathering agent Tinupin 622.

Ift, k, granulated using the same ethylene-butene-1 copolymer as E, mica pieces coated with fine titanium oxide from the above and monoglycerol monostearate are not blended.

I got nine. Hereinafter, this mixed resin will be referred to as B mixed resin.
do.

Next, using two-layer inflated Nisso film processing [-] equipped with two extruders and two dies, the above A mixed resin and B mixed resin were charged into separate extruders, and the melting zone 220
A two-layer laminated film was molded while melting and adhering the mixed resin layer A and the mixed resin layer B in a two-layer die at a die temperature of 200° C. and a die temperature of 200° C. The obtained film is A mixed resin ad
The thickness composition ratio of layer/B mixed resin layer is 1/B and the total thickness is 80
It was a two-layer film of μ.

Film performance tests were conducted with the A mixed resin layer on the outside, and the results are shown in FIG. 1 and Tables 1 and 2.

Example 4 The mixed resin A and the mixed resin B used in Example 8 were used to form a multilayer inflation film equipped with a two- and three-layer inflation die, and the middle layer of the die was passed through an extruder to mix the resin A. The resin is supplied under the conditions of a melting zone of 190°C and a die temperature of 200°C, and the B mixed resin is supplied to the inner and outer layers through the other extruder under the conditions of a melting zone of 190°C and a die temperature of 190°C, and is supplied to each layer. The resin is laminated inside the die, and 't! 12a, intermediate layer 6μ,
The total film thickness was 30μ with an outer layer of 12μ. The performance of the obtained film is shown in FIG. 1 and Tables 1 and 2.

Comparative Example 1 Using only the B mixed resin of Example 8, a thickness of 80 μm
The test results of the performance of the seven films that yielded tm a clear blown films are shown in FIG. 1 and Tables 1-2.

Comparative Example 2 Commercially available aluminum vapor-deposited polyethylene film (Gonko (
The film performance was tested using a 50 μm thick film.

The results are shown in FIG. 1 and Tables 1 and 2.

Comparative Example 3 Ethylene-butene-1 copolymer (density: 0.925.M
I:2) 100 parts by weight Titanium oxide (Teikoku Kako Co., Ltd.) 8.0 parts by weight Monoglycerin monostearate 2.0ffff
fifi 0.1 part by weight of the hindered amine weathering agent Tinuvin 622 was added to the above formulation to obtain a C mixed resin in the same manner as in Example 1.

Then a double-layer inflation fillem processing machine with two extruders and two-layer dies'? The C mixed resin and the B mixed Ja finger of Example 8 were put into separate extruders, and the C mixed resin layer and the B mixed resin layer were formed in a 2 Jl die under the conditions of a melting zone of 220°C and a die temperature of 200°C. A two-layer laminated film was molded while melt-bonding the two. The obtained film was composed of C mixed resin, lll/B mixed resin mixed resin multilayer composition ratio 1
/8 with a total thickness of 80 microns. It was a lil film.

The film performance was tested with the C mixed resin layer on the outside, and the results are shown in FIG. 1 and Tables 1 and 2.

The performance tests of the films shown in the Examples and Comparative Examples were carried out in the following manner: (1) Total light transmittance The total light transmittance of the film was measured using a haze tester manufactured by Toyo Seiki.

(2) Ultraviolet and visible light reflectance The ultraviolet and visible light reflectance of the film was measured using a Hitachi self-recording spectrophotometer model 830.

■ Insect repellent effect Cucumbers are propagated on cultivated crops by mulching a film with a width of 90 pieces, a length of 25 m, and a height of 20 cm. Number of insects (cucumber 8
0 leaves) was investigated.

■ Crop growth The growth of cucumbers was examined under a mulching film similar to the pest repellent effect, and the yield rate at harvest was expressed with frozen ground as 100.

[Brief explanation of drawings]

Figures 1-a and 1-b show the film's ultraviolet to visible light (
A graph of reflectance for wavelengths of 0.2μ to 0.8μ) is shown. Light reflectance (%) Light reflectance (96)

Claims (3)

[Claims] (1) An agricultural pest repellent film characterized by being formed from a thermoplastic resin composition containing mica pieces coated with fine particles of titanium oxide. (2) A transparent thermoplastic resin layer is provided on the inner surface, inner surface, or outer surface of a thermoplastic resin layer containing mica pieces coated with fine titanium oxide particles. Films listed (3) The film forming method consists of a coextrusion film forming method using a two-layer, two-layer or two-layer, three-layer die, or a method of laminating or overlapping two or more films formed separately and heat-sealing them. Film according to claim 1 or 2