JPH0813722B2 - Pest control material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a gap such as a cockroach, a fly or other harmful insects, a drainage port of a sink, or the like, or a precision instrument such as an electronic weighing machine or a vending machine. The present invention relates to a paste-like pest control material which can prevent pests from entering by being applied to the periphery of a device where there is a risk of pests entering.

[Conventional technology]

In recent years, pest control sheets or pest repellent sheets obtained by impregnating paper or synthetic resin with a chemical have been widely used.
These sheets are usually used by laying them around the lower part of the sink, precision equipment, vending machines, etc. However, the work of laying these sheets under the sink or the above equipment requires a considerable amount of labor, and is particularly troublesome especially for heavy objects and highly accurate equipment.
Moreover, after the effectiveness of the drug on these sheets disappears, the same labor is required to remove these sheets.

[Object of the Invention]

The present invention has been made in view of the above circumstances, and the purpose thereof is to be able to fill the gap around the sink of a kitchen where pests easily invade or the gap of the drain port like caulking material or sealing material, Another object of the present invention is to provide a pest control material that can be applied around precision equipment and vending machines and that can be easily peeled off after use.

[Means for achieving the purpose]

In order to achieve the above object, the present invention is a mixture of a pesticide and a diisocyanate prepolymer having a polypropylene glycol chain and a filler, which is in the form of a paste, which is cured by contact with moisture in the air. It was done like this.

The pest control material of the present invention is in the form of a paste, and it is desirable that it cures after a certain period of time. Practically, it is desirable to cure the coating within a few hours after coating, so the proportion of the terminal isocyanate groups in the diisocyanate prepolymer after coating is preferably 3 to 15% by weight. If it is 3% by weight or less, it takes a long time to cure, and if it is 15% by weight or more, the ratio of the segment chains becomes too small, which causes a problem in the sustained release property of the pest control agent described later.

Further, the segment unit of the diisocyanate prepolymer needs to have appropriate hydrophilicity. If the degree of hydrophilicity is too large, the chances of the isocyanate groups coming into contact with water become too large, and thus cross-linking progresses at once and causes foaming. On the other hand, if the degree of hydrophilicity of the segment unit is too small, the opportunity for the isocyanate group to come into contact with water becomes extremely small, and the time required for curing becomes long, which is not practical.

By the way, the pest control material of the present invention desirably releases the pest control agent for a relatively long time.
The so-called sustained release principle of gradually releasing the pest control agent will be described below. That is, the release of the pest control agent is greatly affected by the chemical affinity between the pest control agent and the segment, and the degree of release can be controlled by adjusting the chemical affinity. Here, the solubility coefficient is a factor that controls the strength of the chemical affinity between the two substances. Substances having a similar solubility coefficient generally have good solubility and compatibility, and conversely, substances having a large difference in solubility coefficient have no solubility or compatibility. Therefore, when the pest control agent and the segment have very close solubility coefficient values and good compatibility, a uniform system can be obtained. However, if the chemical affinity between the two becomes too strong, the pest control agent is retained in the segment chains and cannot be released. On the contrary, there is a large difference in the solubility coefficient between the two, and if there is no compatibility or extremely low compatibility, a homogeneous system cannot be obtained.

In the pest control material of the present invention, as a result of earnest research on the above theory, it was possible to make practical use of the pest control material, and coexistence of units having different compatibility with several types of pest control agents in one segment. The release rate of the pest control agent is appropriately controlled by giving a difference in chemical affinity between the unit and the pest control agent.

Further, the pest control material of the present invention is intended to be used by packing it in a tube-shaped closed container, and its ease of use is also an important factor in practical use. That is, the quality of the coating characteristics is determined by its viscosity and hardness. A filler is used to adjust its viscosity and hardness. Also, this filler is
It is also effective for controlling the sustained release because it is densely dispersed in the diisocyanate prepolymer and the pest control agent easily rises to the coated surface through the interface between the fillers.

The pest control material of the present invention is a paste prepared by kneading the diisocyanate prepolymer, the pest control agent and the filler in this manner, and the following is used as the diisocyanate prepolymer. is there.

1) A diisocyanate prepolymer in which the segment chain is a mixture of at least two polypropylene glycols having a molecular weight of 500 to 3,000.

2) A diisocyanate prepolymer composed of a mixture of at least two kinds of polytetramethylene glycol having a molecular weight of 500 to 3,000 as a segment chain.

3) A diisocyanate prepolymer having a mixture of one or more kinds of polypropylene glycol having a molecular weight range of 500 to 3,000 as a segment chain and one or more kinds of polytetramethylene glycol having a molecular weight range of 500 to 2,000.

Further, the amount of such a diisocyanate prepolymer blended is preferably in the range of 30 to 90% by weight in consideration of the efficacy of the drug, the curing time and the like.

As the filler, various inorganic fillers and organic fillers can be used, but depending on the pest control agent used,
Since some of them decompose or deteriorate in the acidic region or the alkaline region, a filler close to neutral is most suitable.
As the filler, chlorinated polyethylene powder, specially treated aluminum hydroxide, titanium oxide and the like are preferably used. It should be noted that such a filler needs to be dried sufficiently before use. This filler is
It may be blended so that the entire system has an appropriate viscosity, but if the ratio of the diisocyanate prepolymer becomes too small, problems occur in terms of curing time and drug efficacy, so the blending amount is at most 75%. It is desirable that the content be up to wt%.

The pest control material of the present invention is mainly used as an pest control agent as an amide repellent alone or in combination with an amide repellent and an insecticide, a bactericide, and is particularly an amide repellent and is soluble in the repellent. When an insecticide and a bactericide are used in combination, the repellent acts as a carrier for these agents, and a small amount of the insecticide and the bactericide can be constantly exuded. At this time, most of the pests do not approach due to the repellent effect of the amide repellent, but a small amount of approaching pests can be killed by the pesticide.

In addition, a bactericidal agent may also be used in the same manner to provide a bactericidal effect.

In addition, when only the insecticidal or bactericidal effect is required without the repellant effect, the insecticidal effect can be obtained by using a solvent having a solubility coefficient similar to that of the repellant and having a function as a carrier agent instead of the repellant. The agents and fungicides are constantly released little by little to exert remarkable insecticidal and bactericidal effects.

Next, as the amide repellent, for example, N.N-diethyl-m-toluamide, N-butylacetanilide,
N.N-diethylsuccinamate and the like can be mentioned, and these can be used alone or in admixture of two or more.

Examples of insecticides include 3-allyl-2methylcyclopent-2-en-4-one-1-yl-dl-cis / trans-chrysanthemate, 3-allyl-2-methylcyclopenta-2. -En-4-on-1-yl-d
-Cis / trans-chrysanthemate, d-3-allyl-2-methylcyclopent-2-en-4-one-1-
Ill-d-trans-chrysanthemate, 3-allyl-
2-Methylcyclopent-2-en-4-one-1-yl-d-transchrysanthemate, 5-benzoyl-
3-Frimethyl-d-cis / trans-chrysanthemate, 5- (2-propargyl) -3-furylmethylchrysanthemate, 3-phenoxybenzyl-2,2-dimethyl-3- (2 ', 2'- Dichloro) vinylcyclopropanecarboxylate, 3-phenoxybenzyl-d-cis /
Trans-chrysanthemate, 0,0-isopropoxyphenylmethylcarbamate, 0,0-dimethyl-0- (3-
Methyl-4-nitrophenyl) thionophosphate,
N- (3,4,5,6-tetrahydrophthalimide) -methyl-d
l-cis / trans-chrysanthemate, 0,0-dimethyl-S (1,2-dicarboethoxyethyl) -dimethyl phosphate, α-isopropyl-4-chlorophenylacetate, 0- (4-bromo-2, 5-dichlorophenyl) -0,0-dimethyl phosphorothioate and the like can be mentioned.

Also, as a bactericide, 2,4,4'-trichloro-2 '
-Hydroxydiphenyl ether, 2,3,5,6-tetrachloro-4- (methylsulfonyl) pyridine, alkylbenzyldimethylammonium chloride, benzylmethyl-2- [2- (p-1,1,3,3-tetramethyl Butylphenoxy) ethoxy] -ethylammonium chloride, 4-isopropyltrobolone, N-N-dimethyl-N-phenyl-N- (fluorodichloromethylthio)
Sulfonamide, 2- (4'-thiazolyl) benzimidazole, N- (fluorodichloromethylthio) phthalimide, 6-acetoxy-2,4-dimethyl-m-dioxyethylenebis (dithiocarbamate) zinc, ethylenebis (dithio) Carbamic acid) manganese, zinc manneb chain compound, bis (dimethylthiocarbamic acid) ethylenebis (dithiocarbamic acid) dizinc, bis (dimethylthiocarbamoyl) disulfide, crotonic acid 2,6-dinitro-4-octylphenyl reaction isomer Mixture, N-
Trichloromethylthiotetrahydrophthalimide, 2,3
-Dicyano-1,4-dithioanthraquinone, 2,4-dichloro-6- (p, -chloroaniline) S-toluazine, S
-N-butyl S'-p-tert-butyl benzyl N
-3'-pyridyldithiocarboxylic imitate, N-
(3 ', 5'-dichlorophenyl) -1,2-dimethylchloropropane dicarboximide, bis (chlorophenyl) trichloroethanol, 6-methylquinoxaline-
2,3-dithiocarbonate, tetrachloroisophthalonitrile, methyl-1- (butylcarbamoyl) -2-benzimidazole carbamate, plasto seizin S-
Examples thereof include benzylaminobenzene sulfonate, streptomycin hydrochloride, kasugamycin hydrochloride and cycloheximide.

Pest control agents consisting of repellents, insecticides, bactericides, etc. as described above can generally exert a remarkable pest control effect when blended in an amount of 1% by weight or more. Considering this, it is possible to set the content in the range of 5 to 30% by weight. However, 40 to 50% by weight may be blended depending on the application.

[Action]

The pest control material of the present invention is in the form of a paste prepared by kneading a pest control agent and a diisocyanate prepolymer having a polyalkylene glycol as a segment chain and a filler, and the isocyanate group of the diisocyanate prepolymer reacts with moisture in the air. , Crosslink and cure.
Therefore, the pest control material of the present invention is packed in a tubular closed container, and when necessary, it is extruded from the tube and injected into the gap around the sink, or when it is applied around the precision equipment, it is cured by moisture in the air. To do.

Then, the cured pest control material of the present invention gradually migrates to the surface through the interface between the filler and the diisocyanate prepolymer and is released in appropriate amounts for a long period of time, so that its medicinal effect lasts long. Of. This is because the segment chains of the diisocyanate prepolymer contain several types of segment units that have different compatibility with the drug.The chemical affinity of each unit and the drug is different, and the drug is released while being controlled appropriately. , The pest control effect is exerted for a long time. Further, after use, it can be peeled off because of the above-mentioned constitution.

〔Example〕

 Hereinafter, examples will be described.

Example 1) 10% by weight of NN-diethyl-m-toluamide as a repellent and aluminum hydroxide as a filler to a diisocyanate prepolymer composed of a mixture of two kinds of polypropylene glycols having a molecular weight of segment chains of 1000 and 2000. 30 wt% was added and kneaded to form a paste, which was filled in a tube to obtain a pest control material of the present invention. The repellent effect of this pest control material on cockroaches was examined by the following method. This pest control material was coated on an acrylic plate of about 1 m x 20 cm to a thickness of about 2 mm to prepare a sample for experiment. On the other hand, paste containing no repellent is approx.
A 1 m × 20 cm acrylic plate coated with a thickness of about 2 mm was prepared for comparison. Then, a plate T1 coated with the repellent-containing paste and a plate T2 coated with the repellent-free paste were set at both ends of a bat A (1 m in length, 1 m in width, 80 cm in height) shown in the figure.

In addition, a partition B is provided at the center of the bat A,
A passage b having a width of 10 cm and a height of 5 cm is provided in the lower center part. Thirty cockroaches were left in the approximate center of the partition B, and after 2 hours, the rate of cockroaches on the side of the plate T2 was expressed as%, which was used as a repellent rate, and a long-term efficacy continuation test was conducted. Table 1 shows the results.

As is clear from the above results, the pest control material of the present invention has a long-lasting repellent effect against cockroaches.

Example 2) A diisocyanate prepolymer having a segment chain of a mixture of polypropylene glycol having a molecular weight of 1000 and polytetramethylene glycol having a molecular weight of 1400, and N-N-diethyl-m-toluamide as a repellent and dimethyl-4-nitro- as an insecticide. 10% by weight and 2% by weight of m-tolylphosphorothioate were added respectively, and 25% by weight of titanium oxide (rutile type) was further added as a filler to form a paste, which was packed in a closed container. The insecticidal effect of this paste on the mites, Plutella xylostella, was examined by the following method. First, the mite is put into a mite breeding medium and adjusted so that the density becomes about 700 heads / g medium.

50 g of this is collected in a petri dish (250 ml). Two petri dishes were prepared, and one of the petri dishes was coated with the above paste-like material to a thickness of about 0.5 mm. The other petri dish is used untreated as a comparative example. 25 ° C for each dish
-75% RH-Installed in the dark, and taken out after 2 weeks and 1 month, the density of mites was examined. The results are shown in Table 2.

As is clear from the above results, the pest control material of the present invention can maintain a remarkable insecticidal effect for a long period of time. that's all,
From Examples 1 and 2, the pest control material of the present invention can sustain the release of the pest repellent for a long period of time by gradually changing the degree of compatibility between the diisocyanate prepolymer and the pest repellent. The repellent effect is also effective for a long period of time.

Example 3) N-N-diethyl-m-toluamide as a repellent and aluminum hydroxide as a filler were blended into a diisocyanate prepolymer composed of a mixture of polytetramethylene glycol having 650 and 1000 segment chains as follows and kneaded. As a result, a paste-like pest control material was obtained. These were coated on a glass plate to a thickness of 2 mm and the curing time was measured.
After about 12 hours, it was completely cured. Table 4 shows the results of measuring the time-dependent drug residual ratio of each of the cured coatings. The residual ratio was measured by extracting the drug with acetone and quantifying it by gas chromatography.

From Table 4, it can be seen that the pest control material of the present invention controls the release of the drug over a long period of time.

All the pest control materials used in the examples cure within 12 hours after application. Further, what was stored in a closed container and stored did not cure even after 6 months, and no change with time was observed.

〔The invention's effect〕

As described above, since the pest control material of the present invention is a paste, it is easy to fill the gap where cockroaches and other pests come in and go out, and it is also easy to apply under or around precision equipment and vending equipment, etc. Is extremely simple. And the pest control material that is applied or packed in a small gap,
Since it reacts with moisture in the air and hardens with the passage of time, there is an advantage that even if a hand or an object touches it later, the control material does not stick to the surface.

In addition, since a suitable amount of the drug is released for a long period of time, the control and curing is long, but if the thickness of the coating film is increased, the control effect can be maintained for a longer period of time. Furthermore, since the pest control material of the present invention is excellent in the peelability of the coating film,
It has the advantage that it can be easily removed after use and that the work of recoating can be done easily.

[Brief description of drawings]

 The drawing is a plan view of the bat. A: bat, B: bulkhead, b ... passage, T1, T2 ... plate.

Claims (4)

[Claims] 1. A pest control material in the form of a paste obtained by kneading a pest control agent and a diisocyanate prepolymer having two or more kinds of polyalkylene glycol chains having different segment chains and a filler. 2. A diisocyanate prepolymer having a polyalkylene glycol chain composed of a mixture of two or more polypropylene glycols having different molecular weights, wherein the molecular weight of polypropylene glycol is in the range of 500 to 3,000. Paste-like pest control material. 3. A diisocyanate prepolymer having a polyalkylene glycol chain composed of a mixture of two or more polytetramethylene glycols having different molecular weights, wherein the polytetramethylene glycol has a molecular weight in the range of 500 to 2,000. The paste-like pest control material according to 1). 4. A diisocyanate prepolymer comprising a mixture of polypropylene glycol having one or more polyalkylene glycol chains having different molecular weights and two or more polytetramethylene glycol having different molecular weights. Molecular weight 50
0-3,000, the molecular weight of polytetramethylene glycol is 50
The paste-like pest control material according to claim (1) having a range of 0 to 2,000.