JPS5833201B2 - Method for manufacturing pest attracting and killing sheets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an insecticidal sheet that attracts and kills pests such as cockroaches, etc.

Various insecticidal sheets for exterminating pests such as cockroaches and flies have been known for a long time, but these insecticidal sheets often contain an insecticide alone or in combination with an attractant on the base material. They are formed in a laminated manner, and therefore their attracting and killing effect generally decreases relatively quickly and does not last for a long period of time.

This trend is also accelerated by the fact that pesticides are easily lost due to surface friction.

For this reason, the insecticide layer is made of polyethylene, polypropylene,
Insecticidal sheets have been proposed that are coated with a protective layer made of a polymer such as polyvinyl chloride, and the insecticide is gradually transferred to the surface of the protective layer, but the concentration of the insecticide on the surface of the protective layer is not always high enough. In addition, when an attractant is incorporated together with an insecticide, the attractant effect is inhibited by the protective layer and is not fully exerted.

The present invention has been made in order to solve the above-mentioned problems with insecticidal sheets for insect pests, and has the purpose of preventing insecticides and attractants from being easily lost even by friction on the surface, and having insecticides and attractants on the surface. It is an object of the present invention to provide a method for producing a sheet for attracting and killing insect pests, which maintains an effective concentration of the insecticide over a long period of time, and thus maintains its attracting and killing effect over a long period of time.

The method for producing a pest-inducing and killing sheet according to the present invention involves applying a urethane prepolymer liquid containing an insecticide onto a sheet substrate, and then adding active groups that can react with water and/or incyanate groups into the molecule. The method is characterized in that the urethane prepolymer is crosslinked by contacting with a solution of an attractant having two or more organic compounds as a solvent.

In the present invention, the sheet base material is a synthetic resin film,
Woven fabrics, non-woven fabrics, paper, etc. made of synthetic fibers or natural fibers are used.

As the urethane prepolymer, any suitable urethane prepolymer can be used without particular restriction as long as it has two or more incyanate groups in the molecule, but it is preferable to use polyether polyol, particularly preferably polyethylene glycol at the molecular chain end. A prepolymer obtained by reacting a diisocyanate such as metaphenylene diisocyanate or tolylene diisocyanate, or a prepolymer containing this as a main component is used.

In general, polyether polyol polyisocyanate prepolymers have excellent surface mechanical strength, and polyethylene glycol polyisocyanate prepolymers are hydrophilic, so they can be easily crosslinked with water, and insecticides are generally lipophilic. This is because the cross-linked polyurethane layer is transferred and leached to the surface at a high concentration.

The above polyether polyol polyisocyanate prepolymers are easily available as commercial products.

In addition to sumithion and diazinon, synthetic pyrethroid insecticides such as permethrin, and mixtures of two or more of these are suitable as insecticides to be contained in the urethane prepolymer in view of their insecticidal effect, safety, and ability to migrate to the surface of the crosslinked polyurethane layer. It is.

Such insecticides are used in an amount of 5 to 100 parts by weight per 100 parts by weight of the prepolymer.

It goes without saying that insecticides other than those mentioned above may be used in combination as necessary.

The amount of the prepolymer liquid containing an insecticide to be applied to the substrate depends on the insecticide content in the liquid, but is usually 1 to 2.
00? /m, preferably 3 to 1001/m2.

The amount of insecticide per base material Im' is 1. C1-IOP is suitable.

The insecticide-containing prepolymer coated on the substrate is an organic compound (including a polymer) having two or more active groups capable of reacting with an isocyanate group in its molecule.

) or a mixture thereof is crosslinked by contacting with a solution of a pest attractant in a solvent.

The active group is typically a hydroxyl group, an amino group, a carboxyl group, etc.

Since most attractants are water-soluble, water is preferably used as the solvent, but depending on the type of attractant, water may also be used as a crosslinking accelerator for urethane prepolymers.
Alternatively, an aqueous solvent containing polyol, polyamine, etc. may be used as a catalyst, or these organic solvents alone may be used as a solvent.

As the attractant, one or a mixture of two or more of refined sugar, blackstrap molasses, sugars, amino acids, peanut oil, etc. is preferably used.

These attractants have active groups such as hydroxyl groups and amino groups in their molecules that can react with the incyanate groups of the prepolymer, so when the prepolymer is crosslinked and highly polymerized in the solvent of the attractant solution, the attractant This is because at least a portion of the attractant itself is incorporated and fixed in the crosslinked polyurethane, and is prevented from disappearing due to mechanical friction on the surface of the crosslinked polyurethane layer or volatilization of the attractant.

The attractant content of the attractant solution is not particularly limited, but usually
It is about 5 to 30% by weight.

To contact the attractant solution with the prepolymer on the substrate,
For example, the attractant solution is sprayed with a spray gun, but the
Methods such as immersion can also be employed.

The amount of the attractant solution used is sufficient to crosslink the prepolymer, and the crosslinking temperature may be at room temperature, but heating may be used if necessary.

As described above, according to the method of the present invention, the insecticide gradually migrates through the crosslinked polyurethane layer and leaches onto the surface of the crosslinked polyurethane layer.
The effective concentration of the insecticide is always maintained on the sheet surface, resulting in a high insecticidal effect, while the attractant is distributed on the surface of the cross-linked polyurethane layer and in its vicinity, at least a portion of which is chemically bonded to the polyurethane. , the attracting effect is well exhibited, and it is not easily lost due to mechanical friction or the like.

Therefore, the insecticidal sheet produced by the method of the present invention maintains its attracting and killing effect on pests such as cockroaches and flies for an extremely long period of time, for example, 20 weeks or more, at normal operating temperatures.

Examples of the present invention are listed below, but the present invention is not limited to these Examples.

Example 1 Urethane prepolymer "Takenate A433" known to be a polyether polyol isocyanate
50 parts by weight of the insecticide permethrin was mixed with 100 parts by weight of NSJ (manufactured by Hikari Yakuhin Kogyo Co., Ltd.), and the mixture was applied onto a 25 μm thick polyester film using an applicator. / m
It was applied at a rate of ”.

When an aqueous solution containing 10% by weight of refined sugar was sprayed onto this coating layer using a handy sprayer at room temperature, the prepolymer formed a film after about 15 minutes.

The insect-killing sheet obtained in this way was placed on the bottom of a glass container with a diameter of 60 mm and a height of 120 mm, and then five male and female adult German cockroaches were released into the container and forced into contact with the insect-killing sheet, resulting in a 50% knock-off. Downtime was measured.

As the results are shown in Figure 1, no decrease in the insecticidal effect was observed even after 18 weeks.

In addition, a similar efficacy test was conducted immediately after rubbing the surface of the insecticidal sheet 100 times with gauze wrapped around a glass rod, but no decrease in efficacy was observed even after 18 weeks.

Furthermore, a shelter containing 50 German cockroaches was placed at one end of a box measuring 50cm x 60CTl x 12cfrL, the other end was separated by a wall to form two passages, and water was placed at the far end of each passage. In the middle of the passage, the insecticidal sheet A cut into 5 cm width was placed on one side, and the insecticidal sheet B) prepared in the same manner as in Example 1 except that it did not contain an attractant was placed on the other side.
The effectiveness of both insecticidal sheets was compared.

The results are shown in Figure 2. The attraction effect is clear.

Example 2 Urethane prepolymer “Takene” A433NSI10
0 parts by weight and 30 parts by weight of the insecticide Diazinon were mixed and spread on a 25μ thick polyester film. /rrt.

Thereafter, an insecticidal sheet using refined sugar as an attractant was prepared in the same manner as in Example 1.

The 50% knockdown time of this insecticidal sheet was measured in the same manner as in Example 1, and it showed sufficient insecticidal efficacy even after 20 weeks.

[Brief explanation of drawings]

FIG. 1 is a graph showing the change in 50% knockdown time against German cockroaches of the attracting and killing sheet according to the method of the present invention, and FIG. 2 is a graph showing a comparison of the insecticidal efficacy with and without an attractant.

Claims (1)

[Claims] 1. A urethane prepolymer liquid whose main component is polyether polyol isocyanate containing sumithion, diazinon, pyrethroid insecticide, or a mixture of two or more of these is applied onto a substrate, and then A method for producing a pest attracting and killing sheet, which comprises crosslinking the urethane prepolymer by contacting it with an aqueous solution of an insect attractant having an active group in its molecule that can react with the isocyanate group of the urethane prepolymer. 2. The method for producing a pest attracting and killing sheet according to claim 1, wherein the pest attracting agent is refined sugar, blackstrap molasses, sugar, peanut oil, amino acids, or a mixture of two or more thereof. .