JP6499894B2 - Mollusk repellent - Google Patents

Description

  The present invention relates to a repellent material for molluscs, and more particularly to a repellent material for molluscs belonging to gastropods such as slugs, snails and the like that cause damage to plant shoots, flowers, leaves, fruits and the like.

Many plants such as vegetables, edible mushrooms, flowering trees are cultivated in outdoor cultivation and house cultivation. In these plants, shoots, flowers, leaves and fruits are often damaged by slugs and snails. Especially in house cultivation, the watering frequency is high, and slugs, snails, etc. are parasitized in a humid environment, and there is a problem that they are damaged by shoots.
Synthetic drugs containing paraformaldehyde or metaldehyde as active ingredients are known as methods for preventing these food damages. However, this drug is intended for the control of insect pests and insecticides, but it has a strong medicinal effect, but if it adheres to plants, it may damage the plants. There are many problems, such as the necessity of avoiding contact with pets, and the fact that the effect is not sustained by being washed away by watering or rain.

  In order to solve this problem, for example, the squeezed rice cake after squeezing the vegetable oil from the seeds of the camellia family plant has a repellent effect on slugs and snails, and the squeezed cocoon granulated material should be used as a repellent Is also known (Patent Document 1). The medicinal component of this repellent is considered to be saponin. However, these solid squeezed squeezed troughs suffer from a decrease in medicinal effects due to scattering by the wind and burial in the soil. In addition, the granulated product is uneven in effect due to the unevenness of the applied medicine as well as being buried in the soil. Furthermore, the medicinal effect is greatly reduced with time. Especially, the medicinal component is discharged due to rain, and the subsequent effect is greatly reduced.

  In addition, it has been proposed that saponin is attached to a synthetic resin tape or sheet coated with an adhesive on the back surface (Patent Document 2). However, when the synthetic resin tape is used as the surface, the medicinal effect is insufficient, and when the saponin adhesion surface is used as the surface, the decrease in medicinal effect over time as in the above case, or after rain or water sprinkling. Degradation of medicinal effect is large.

  Furthermore, as means for solving the above-mentioned problems, an extract from the oil lees squeezed with camellia plant seeds is used as an aqueous resin, such as a water-soluble acrylic resin, a water-soluble polyester, a water-soluble polyurethane, a water-soluble alkyd resin, A mollusc repellent sheet is disclosed in which a coating solution contained in a water-soluble epoxy resin or the like is applied to a sheet-like member and dried and / or heat-treated, or the resin is cured by crosslinking or the like to improve strength and water resistance. (Patent Document 3). However, this repellent sheet has a complicated manufacturing process, and the cured resin not only has high rigidity and poor handleability, but also has no familiarity with the ground, and therefore has a poor medicinal effect. In addition, the water-based resin cured product evaporates water, which is a dispersant, during the curing process, resulting in the formation of fine pores on the surface and the initial medicinal effect, but the effect after rain and water spraying. The decline is large and the sustainability is not enough.

JP-A-8-175925 JP 2002-171892 A JP 2013-155116 A

  In view of such circumstances, the present invention solves the above-mentioned problems of the prior art, there is no decrease in medicinal effect due to watering or rainfall, and the medicinal effect is effectively exhibited by being well adapted to the flexible and uneven ground, When a resin with low compatibility with saponin is used, the saponin migrates from the inside of the resin film to the surface with the passage of time (migrate), and exhibits a uniform medicinal effect over a long period of time. It is an object of the present invention to provide a mollusc repellent material that can be easily manufactured by processing.

  As a result of intensive studies, the present inventors have found that a repellent material for mollusks comprising a thermoplastic resin film containing saponin, or a repellent material for mollusks in which the film is laminated on a substrate, can overcome the above-mentioned problems. As a result, the present invention has been completed.

The present invention is characterized by the following.
1. Ri Do a thermoplastic resin film containing a saponin, mollusc for repelling material, wherein the thermoplastic resin is low density polyethylene or linear low density polyethylene.
2. The repellent material for molluscs according to 1 above, wherein a thermoplastic resin film containing saponin is laminated on a substrate.
3 . 3. The mollusk repellent material according to 1 or 2 above, wherein the thermoplastic resin film has a thickness of 5 to 50 μm.
4 . 2. The repellent material for molluscs according to 2 or 3 , wherein the base material is paper.
5 . 5. The mollusc repellent material according to any one of 2 to 4 above, wherein the base material has a thickness of 10 to 150 μm.

  According to the mollusc repellent material of the present invention (hereinafter sometimes referred to simply as “repellent material”), the saponin is not washed away by watering or rain, and the medicinal effect is maintained for a long time.

  In addition, since the resin is not cross-linked or thermoset, it is rich in flexibility and well-adapted to uneven ground, and effectively exhibits medicinal effects.

When polyethylene or low density polyethylene is used as the thermoplastic resin, these have moderate gas permeability , so that the saponin is gradually permeated and released from the film to maintain the repelling effect for a long time. Furthermore, since these resins have poor compatibility with saponins, saponins migrate (migrate) from the film, and can exhibit and maintain a uniform repellent effect over a long period of time.

  Further, the lamination with the base material facilitates the manufacture of the repellent material and increases the strength. Use of paper as the substrate is advantageous because saponin is released from the gap between the fibers of the paper and exhibits medicinal effects.

The saponins used in the present invention are glycosides composed of sapogenins and sugars, and are included in various plants such as Soybean. Pure ones hydrophilic white powder, is a parents amphiphilic substances lipophilic, camellia, tea, powders obtained by also extracted from oil extraction residue after oil extraction of seeds of Theaceae plant such as camellia Can be used. Moreover, as a commercial item, it is sold by Tokyo Chemical Industry Co., Ltd. under the trade name “Saponin” and can be used.

The thermoplastic resin containing saponin is preferably a flexible resin from the viewpoint of adapting to the unevenness of the ground when it is made into a film.
Further, from the viewpoint of transferring saponin from the film to the surface and releasing it slowly, it is preferable that the saponin is not compatible with saponin, and that the gas permeability and moisture permeability are good. As such a thermoplastic resin, polyolefin resins such as polyethylene, particularly low density polyethylene, linear low density polyethylene, and copolymers thereof are preferable. Polyolefin resins are preferred because they have a low environmental impact and are inexpensive.
From the viewpoint of further environmental friendliness and low load, biodegradable plastics such as polylactic acid, polybutylene succinate, polyamide 11 and polyhydroxybutyric acid and biomass plastics can also be used.

  The amount of saponin blended in the resin tends to decrease the film formability although the repellency increases as the amount of saponin increases. Therefore, it is appropriately determined in consideration of the desired repellent effect, the type of resin, the molding method, and the like. Usually, the weight ratio is preferably 4 to 35%, more preferably 15 to 35%, and still more preferably 20 to 35%. If it is less than 4%, the repellent effect is not sufficient, and if it exceeds 35%, foaming due to moisture may occur during film forming, processing, or extrusion lamination onto a substrate due to the hygroscopicity of saponin, which may make processing difficult. . Therefore, it is possible to add a large amount exceeding 35% by sufficiently drying saponin or a saponin-containing resin in advance.

  If necessary, an additive such as an antioxidant, an ultraviolet absorber, a light stabilizer, an antistatic agent, a plasticizer, and a filler can be added to the saponin-containing resin.

As described above, the saponin and the resin containing an additive as necessary are formed into a film by a known method, but extrusion molding is preferred. Moreover, this film can also be laminated | stacked on a base material as needed, and an extrusion lamination process is preferable as a lamination | stacking method.
As the substrate, paper, a plastic film such as polyethylene, a natural fiber or synthetic fiber fabric, a nonwoven fabric, and the like can be used. Among these, paper is preferable. By using paper as the base material, saponin is released from the gap between the fibers of the paper, so that a repellent effect can also be obtained from the side in contact with the base material.

In the present invention, the thickness of the saponin-containing thermoplastic resin film is not particularly limited, but if it is too thick, the conformability to the ground becomes insufficient, while if it is too thin, the strength becomes insufficient. Therefore, generally about 5-50 micrometers is preferable.
Further, if the thickness of the substrate is too thick, the conformability to the ground is lowered, and if it is too thin, the strength becomes insufficient. Therefore, the thickness is usually preferably about 10 to 150 μm, more preferably 10 to 130 μm.

  Extrusion molding and extrusion laminating process may be performed at a temperature as low as possible since there is a risk that the saponin is excessively heated to reduce the medicinal effect or to be invalidated. For example, in the case of polyethylene, the temperature is about 170 to 220 ° C. Is appropriate. If necessary, the substrate can be subjected to corona treatment or the like to enhance the adhesion to the film.

EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated further in detail, this invention is not restrict | limited at all by these. The repellent effect of the repellent material was evaluated by the following method.
Test method for repellent effect:
A drain outlet was provided at the bottom of a wooden box of 40 cm × 40 cm × (height) 30 cm, and a sample of repellent material of 30 cm × 30 cm was placed in the center. About 10 g of a commercially available oil bottle was placed as a mollusc attractant in the center of the box. Ten slugs were placed around the sample in the box and left for 6 hours at a temperature of 25 ° C. and a relative humidity of 65%. Water was sprayed with a gardening fountain at the point of 3 hours on the way. After 12 hours, the number of slugs on the oil bottle was counted. Slugs were collected from the farmer's house.

Example 1
After blending 5% by weight of saponin (trade name: saponin, manufactured by Tokyo Chemical Industry Co., Ltd.) into linear low density polyethylene (LLDPE manufactured by Nippon Polyethylene Co., Ltd .: Harmolex NH845N, specific gravity: 0.913), a basis weight of 84 g ( The LLDPE resin blended with saponin is extruded to a non-bleached kraft paper with a thickness of about 110 μm at a die temperature of 210 ° C. using a T-die extruder and a corona treatment is applied to one side of the kraft paper to a laminate thickness of about 20 μm. Laminate to make a repellent material for mollusks.

Example 2
After blending 10% by weight of saponin (trade name: saponin, manufactured by Tokyo Chemical Industry Co., Ltd.) with low density polyethylene (LDPE: Sumikasen L405, manufactured by Sumitomo Chemical Co., Ltd., specific gravity: 0.924), the same as in Example 1 was performed. The LDPE resin containing saponin is extruded onto unbleached kraft paper using a T-die extruder at a die temperature of 210 ° C., and laminated to a laminate thickness of about 20 μm while corona treatment is applied to one side of the kraft paper. A repellent material for mollusks was prepared.

Example 3
After blending 15% by weight of saponin (trade name: saponin, manufactured by Tokyo Chemical Industry Co., Ltd.) into linear low density polyethylene (NLD, manufactured by Nippon Polyethylene Co., Ltd .: Harmolex NH845N), the same as in Example 1, The LLDPE resin blended with saponin on unbleached kraft paper is extruded using a T-die extruder at a die temperature of 210 ° C., and laminated to a laminate thickness of about 20 μm while corona treatment is applied to one side of the kraft paper. Animal repellents were prepared.

Example 4
After blending 20% by weight of saponin (trade name: saponin, manufactured by Tokyo Chemical Industry Co., Ltd.) into linear low density polyethylene (NLD, manufactured by Nippon Polyethylene Co., Ltd .: Harmolex NH845N), the same as in Example 1, The LLDPE resin blended with saponin on unbleached kraft paper is extruded using a T-die extruder at a die temperature of 210 ° C., and laminated to a laminate thickness of about 20 μm while corona treatment is applied to one side of the kraft paper. Animal repellents were prepared.

Example 5
After blending 30% by weight of saponin (trade name: saponin, manufactured by Tokyo Chemical Industry Co., Ltd.) into low density polyethylene (LDPE: Sumikasen L405, manufactured by Sumitomo Chemical Co., Ltd., specific gravity: 0.924), pelletization was carried out in the same manner as in Example 1. The LDPE resin containing saponin is extruded onto unbleached kraft paper using a T-die extruder at a die temperature of 210 ° C., and laminated to a laminate thickness of about 20 μm while corona treatment is applied to one side of the kraft paper. A repellent material for mollusks was prepared.

Example 6
After blending 33% by weight of saponin (trade name: saponin, manufactured by Tokyo Chemical Industry Co., Ltd.) with linear low density polyethylene (LLDPE: Harmolex NH845N, manufactured by Nippon Polyethylene Co., Ltd.), the same as in Example 1 In addition, the LLDPE resin blended with saponin on unbleached kraft paper is extruded at a die temperature of 210 ° C. using a T-die extruder, and laminated to a laminate thickness of about 20 μm while corona treatment is applied to one side of the kraft paper. A repellent material for mollusks was prepared.

Example 7
In Example 1, 20% by weight of saponin was blended with LLDPE without using unbleached kraft paper, and a 30-μm thick film was extruded using a T-die extruder to produce a repellent material for mollusks.

Comparative Example 1
Except that the saponin was not added to the LLDPE resin, the LLDPE resin was extruded on one side of the unexposed kraft paper at a die temperature of 210 ° C. using a T-die extruder in the same manner as in Example 1. The kraft paper was laminated on one side so as to have a thickness of about 20 μm to prepare a repellent material for mollusks.

  A 30 cm × 30 cm sample was cut out from the mollusc repellent material obtained in Examples 1 to 7 and Comparative Example 1 and tested for the repellent effect. The test results are shown in Table 1.

  As is clear from the results in Table 1, the mollusc repellent material of the present invention represented by Examples 1 to 7 exhibits an excellent repellent effect. From the comparison between Example 4 (laminated body) and Example 7 (single film), there is a difference in repellent effect between the mollusc repellent material composed of the laminated body and the soft animal repellent material composed of the film alone. It is not allowed.

  As described above, according to the mollusc repellent material of the present invention, there is no decrease in medicinal effect due to watering or rain, it is flexible and well-adapted to the unevenness of the ground, effectively exhibits medicinal effect, and is compatible with saponin. When a resin having poor solubility is used, the saponin is transferred from the inside of the resin film to the surface and is released gradually, so that the medicinal effect is maintained for a long time. In addition, when laminated with a base material, the manufacturing is easy and the strength is improved, and when paper is used as the base material, saponin is released from the gap between the fibers of the paper, so that it contacts the base material. The repellent effect is also obtained from the side.

Claims (5)

Ri Do a thermoplastic resin film containing a saponin, mollusc for repelling material, wherein the thermoplastic resin is low density polyethylene or linear low density polyethylene.   The repellent material for molluscs according to claim 1, wherein a thermoplastic resin film containing saponin is laminated on a substrate. The repellent material for molluscs according to claim 1 or 2 , wherein the thermoplastic resin film has a thickness of 5 to 50 µm. The mollusc repellent material according to claim 2 or 3 , wherein the base material is paper. The repellent material for molluscs according to any one of claims 2 to 4 , wherein the thickness of the substrate is 10 to 150 µm.