JP2005213162A - Repelling sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for preparing a sheet which contains glucomannan containing a repellent against insect pests and harmful animals as a main component, and to provide a method for tightly adhering the sheet to a target. <P>SOLUTION: The method for preparing the sheet comprises charging a mixture of sol-gel state devil's tongue adjusted to an insolubility-imperfect pH region with a repellent such as red pepper into a desired mold and then drying the molded mixture. The sheet is not dissolved or collapsed but exhibits a proper sticking force, when wetted with water. When the sheet is adhered to a place liable to be injured by insect pests or harmful animals, a sufficient adhesive force to the target, a sufficiently repellent-holding ability, and a sheet-masking effect are obtained. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

Just wet the water with a sheet composed mainly of glucomannan to which repellents against pests and pests are added to the crops, trees, fences and buildings to maintain the repellent effect.

  Pests and pests can be repelled or controlled by physical measures such as installation of intrusion prevention measures, covering sheets, and threats by sound and light, and chemical measures such as spraying, spraying and applying repellents. Has been taken. Of these, physical countermeasures not only require a large amount of work but also cause a loss of aesthetics. On the other hand, the use of repellents has problems such as low sustainability of repellent effect, health problems such as falling of components on workers during spraying or spraying, and contamination of adjacent areas.

Today, chemically synthesized polymers are often used as spreading agents for retention of repellent components against pests and pests, but chemically synthesized polymers have little or no biodegradability. Therefore, the use of substances with low biodegradability for repellents used in nature is a direct cause of environmental pollution. On the other hand, since glucomannan is the main component of konjac, it is biodegraded when left in nature after use, and does not generate harmful substances when incinerated or landfilled.
From such a viewpoint, research and development of biodegradable polymers as spreading agents are being conducted.

  As natural product-based spreading agents, starch, glucomannan sol and the like are used. However, when used in nature, there are drawbacks such as being easy to be washed away by rain, so that the holding period is short, spraying is difficult, and application takes time.

From the above, no repellent that has good workability, retains the repellent component for a long time, and biodegrades after a certain period of time has not yet been found.
JP-A-5-287259 JP-A-7-82416 JP-A-7-224187 JP-A-7-76502 JP 7-304881 A JP 2002-355918 A Makoto Oki's “Science of Konjac” published by Keisuisha

  The present invention is a repellent sheet mainly composed of glucomannan and various repellent components that can be easily adhered to a place where there is a risk of damage by pests and pests.

The inventor of the present application put a sol-gel konjac adjusted to a pH region incompletely insolubilized with a repellent component such as pepper and put it into a desired mold, and then dried to prepare a sheet. It has been found that when this sheet is wetted with water, it becomes a sheet having an appropriate spreading force that does not melt or disintegrate. When this sheet was affixed to a place where there was a risk of damage by pests or pests, sufficient adhesion to the object, sufficient ability to retain repellent components, and inconspicuous effects were obtained.

The konjac sheet of the present invention does not melt or disintegrate when wetted with water, but can exhibit an appropriate spreading force. Therefore, it is possible to stick the sheet to a crop, a tree, a fence, and a building simply by wetting the sheet with water.

  Production examples and adaptation examples when the konjac sheet of the present invention is a slug repellent sheet are shown below.

As an example of the present invention, a method for producing a slug repellent sheet for the purpose of sticking and sticking to a flower pot will be described below.
First, the konjac powder is swollen with water, optimally making 0.4% to 0.7% konjac sol. Next, 0.1 wt% to 1.5 wt% is mixed into the konjac sol that is made of a pulverized product of fibrous material such as pulp, and 1.0 wt% to 5.0 wt% is added to the konjac sol that is made with pepper as a repellent component. mixing. Next, an alkaline substance such as calcium hydroxide is added in an amount of 0.07 wt% to 0.1 wt%. Finally, stir well so that everything is evenly mixed.

  Next, a well-stirred sol-gel konjac is poured into an arbitrary mold and dried. The drying at this time may be either room temperature or heat drying.

  FIG. 1 shows the relationship between the amount of alkali agent added to sol-like konjac and the strength when konjac sheets prepared by drying them are immersed in water. From this figure, it can be seen that the strength of the konjac sheet increases stepwise as in regions I, II, III and IV as the amount of alkali agent added is increased. Region I is a region that collapses as soon as it is immersed in water. Area II is an area that collapses before long, although it maintains its shape for a while after being immersed in water. Area III is an area that does not collapse but slips. Region IV is a region that does not collapse and does not slip. Therefore, it can be seen that the strength of the konjac sheet can be controlled only by changing the amount of the alkali agent added to the sol konjac.

  The reason why the shape collapse of the konjac formed product of the present invention can be controlled will be described below. Konjac mannan is composed of a complex polysaccharide in which a large number of D-glucose and D-mannose are bonded by β-1.4 bonds in a molar ratio of 2: 3 to 1: 1.6. Further, there is a branch by β-1.3 bond from the mannose group of the main chain at a ratio of 1 to 32 to 80 sugar residues, and an acetyl group is ester-bonded at a ratio of 1 per 19 sugar residues.

  The gelation mechanism of konjac mannan is triggered by deacetylation with an alkaline additive, and konjac mannan, which has lost its acetyl group by alkali treatment, is partially crystallized by intermolecular hydrogen bonding, forming a network structure with this as a node. It becomes insoluble.

  At this time, the deacetylation can be limited by adjusting the amount of the alkaline additive, and the formation of a network structure by the subsequent hydrogen bonding can be adjusted, so that the strength of the konjac gel can be controlled. Thus, the sol-gel konjac produced by adjusting the alkaline addition amount becomes a sol-gel konjac having a different degree of gelation depending on the alkaline addition amount. Therefore, the sol-gel konjac having a low gelation degree is easily dissolved in water and the time for the shape to collapse is shortened. (See Figure 1)

  Based on the composition of the sol-gel konjac, the formation process is facilitated by adding an arbitrary amount of fibrous substance as a support to the composition.

  As an adaptation example, FIG. 2 shows a case in which a slug repellent sheet is stuck on a flower pot.

  Water was sprayed around the flowerpot where the foliage plant was planted using a spray bottle. A 5 cm square slug repellent sheet was adhered and adhered thereto at an interval of 5 cm. Due to the effect of water sprayed on the flower pot, moderate slippage occurs in the repellent sheet. This slip is a part of glucomannan that has not been subjected to the gelling action by alkali, and acts as an adhesive when the flower pot wall and the sheet are brought into close contact with each other, and as a retentive agent for pepper particles.

  Ten slugs were left around the flower pot to which the repellent sheet was stuck.

  Since all slugs left unattended were climbing up the wall surface of the flower pot while avoiding the repellent sheet, the repellent effect of the slug repellent sheet was confirmed.

In this way, by adjusting the addition amount of the alkaline agent, it becomes possible to produce a sheet that does not dissolve even when immersed in water but causes slipping, so that various substances can be held for a long time. Not only that, but it can be attached to an object by using it together with water.

  In addition to the slug repellent effect, the sheet with pepper as mentioned in Example 2 is effective not only for pests but also for pests such as crows, dogs, cats and deer. On the other hand, if the repellent component to be added is changed depending on the method of use and location, it can be applied to a wider range as a repellent material. Specific examples include limonene, hinokitiol and naphthol, and these substances are also effective in repelling pests and pests. Moreover, it can also be applied as a protective sheet to which various nutritional components and antibacterial and antifungal agents are added and attached to damaged parts of trees. Moreover, the sheet of the present invention can be finished in the shape of a translucent thin film. Therefore, it becomes inconspicuous when pasted and can be used without impairing the appearance. In addition, since it is biodegraded and weathered in a few months, there is no need for special cleanup.

It is a graph showing the relationship between the amount of alkali agent added to sol-like konjac and the strength when konjac sheets prepared by drying them are immersed in water. (Example 1)

It is the schematic when using the repellent sheet | seat which has glucomannan as a main component which can be stuck on the target object of this invention for slug repellent use. (Example 2)

Explanation of symbols

1, slug feed 2, flower pot 3, slug repellent sheet 4, slug

Claims (2)

  A repellent and extermination sheet for pests and pests, characterized in that the main component is glucomannan in a biodegradable polymer. The repellent and disinfectant material made of a biodegradable polymer according to claim 1, which can be easily adhered and adhered to crops, trees, fences and buildings by only being wetted with water.

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