JPH0436121B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention can be applied or sprayed on concrete foundations such as under floors of homes and buildings, wood foundations and soil around them, or other entry routes for pests such as termites, house ants, and wasps. In particular, the present invention relates to a pest control material and a pest control method for controlling feeding damage caused by these pests over a long period of time. (Prior art) Conventional measures against termite damage to houses, etc. are to apply a large amount (approximately 100 g/ ^m2 ) of an emulsion, granule, or wettable powder of a termite control agent such as chlordane to the soil under the floor.
The soil was treated by spraying it on the ground. In addition, in recent years, when constructing houses, wood that has been pre-impregnated with a termite control agent and has been treated to prevent damage from being eaten by termites is being used. Recently, a method has also been proposed in which a plastic film made of vinyl chloride, polyethylene, polyvinyl acetate, etc. mixed with a termite control agent is used and the plastic film is attached to the entire surface of the underfloor and to the concrete and wood parts of the foundation. Furthermore, as a termite control means for communication cables, etc., in Japanese Patent Application Laid-Open No. 55-85501, a termite control agent is mixed with foamable urethane resin, and the mixture is filled into any gaps in the installation location of the cables etc. to form a foam. What makes it happen is disclosed. (Problems to be Solved by the Present Invention) However, in the case where the termite control agent is sprayed in the form of an emulsion as described above, in order to maintain the medicinal effect for a long period of time, for example, 10 years, it is necessary to It is necessary to use a control agent with a much higher concentration than that required to actually control termites, but when doing so, it is extremely dangerous if the worker inhales the chemical solution during application. A problem has arisen in that the termite control agent permeates into the ground through rainwater and the like and mixes into groundwater, causing pollution such as contaminating well water. For this reason,
Recently, only low concentrations of chlordane can be used, and in the case of chlordane, concentrations of 6% or more have come to be classified as deleterious substances. Therefore, at this low concentration, there is a problem that the effect is not long-lasting. In addition, wood that has been treated with anti-corrosion protection is expensive because it cannot be processed efficiently, and the reality is that it is only used for the foundations of buildings, leaving other areas at risk of damage. There are also doubts about the long-term sustainability of the effects. In addition, the means using plastic film is
The cost is extremely high because the installation is very complicated and troublesome, and if the plastic film has even the slightest pinhole or peels off, there is a risk that it will create an ant trail and allow termites to invade the house. There is a problem of lack of reliability. Furthermore, when the method of mixing with foamable urethane resin is applied to houses, the following disadvantages occur. Termites are mainly harmful to humid areas such as kitchens, washrooms, and bathrooms, but foamable urethane resins mainly have many open cells, and moisture infiltrates into the open cells, making them not moisture-proof. There is a risk of ant trails forming through the pores of the open cell material. Foamable urethane resin, regardless of whether it is an open cell or a closed cell, generates heat when foaming, and the chemical decomposes and evaporates at that time. Drugs are easily released through the pores of open-cell cells, which have a large surface area, and drugs are trapped within the pores of closed-cell cells, making it difficult to control the release of drugs, making sustained release difficult. is difficult to obtain. Foamed urethane yellows and deteriorates over a long period of time, becoming brittle, and there is a risk of powdering and falling off, resulting in poor durability. (Means for solving the problems) In order to solve the above-mentioned problems, the present invention has the following features:
For a cured product formed by mixing an insect repellent with at least one of the isocyanate component and the polyol component, which are urethane prepolymers, and the isocyanate component and the polyol component.
Two liquids composed of inorganic microparticles having a weight blending ratio of 30 to 80% are mixed at the time of application,
This is applied by coating or spraying on the foundations of buildings and the surrounding soil and other pest entry routes, and is cured to form a cured product of urethane prepolymer. (Function) In this way, since the pest control agent is contained in the cured product of the urethane polymer, it will not be washed away by rainwater, etc., and therefore the concentration of the pest control agent can be increased. A high pest control effect can be achieved just by applying it to the narrow area where it is really needed. In addition, due to the mixing of microscopic particles, the gaps between the countless microscopic particles will be filled with the urethane polymer mixed with the pest control agent, and the urethane polymer will have a spongy structure. The pesticide does not remain completely trapped in the polymer, but is gradually released, and sustained release can be controlled by controlling the amount of microparticles. (Example) The pest control material according to the present invention will be described below based on Examples. The pest control material of the present invention consists of two liquids in which an insect control agent and microparticles are mixed into one or both of an isocyanate component that is a urethane prepolymer and a polyol component, and these two liquids are mixed at the time of application. , which is cured to form a cured urethane polymer. The urethane prepolymer is
Since it does not contain a solvent and can be cured at room temperature, the pest control agent does not volatilize, and the pest control agent can be easily mixed at room temperature, so it can be used industrially advantageously. The pest control agent is preferably a combination of a contact poisonous agent with a residual effect such as chlordane, deirdrin, aldrin, permethrin, and a fast-acting agent such as phoxim or chlorpyrifos. 0.5 to 6% each based on the cured product of urethane polymer
They are mixed at a weight blending ratio of about 100%. In addition,
A residual-acting agent or an immediate-acting agent can be used alone as the pest control agent. Further, as types of pest control agents, pyrethroid insecticides, organophosphorus insecticides, carbamate insecticides, etc. can be used, and repellents such as diethyl metatroamide can also be used. In addition, as fine particles, alkaline ones decompose pest control agents, so aluminum hydroxide (Al
Neutral materials such as (OH) ₃ are preferred, but alkaline materials such as magnesium carbonate (MgCo ₃ ), calcium silicate, silica, talc, etc. that have been surface-treated with titanium-based or silane-based coupling agents, etc.
Use inorganic fine particles such as diatomaceous earth or acidic clay. These microparticles form a sustained release pathway, making it possible to control sustained release, and also act as a bulking agent and clay conditioner.
The fine particles are mixed in a weight ratio of about 30 to 80%, preferably 50 to 70%, based on the cured product of the urethane polymer. Furthermore, the microparticles preferably have a particle size of 50 to 150μ.
It is desirable to appropriately combine large-sized microparticles and small microparticles of about 5 to 50 microns. As a result, small microparticles are appropriately scattered between large microparticles, and the gaps are filled with the urethane polymer mixed with the pest control agent.
A fine path is formed in the urethane prepolymer that slowly releases the pest control agent from the inside of the cured urethane polymer to the surface, ensuring that the insect control agent is not trapped in the urethane polymer and is not quickly released only from the surface. As a result, the release of the pest control agent is controlled and the sustained release performance is further improved.
In addition, since the small microparticles act as a roller on the large particles, the increase in viscosity can be suppressed, and the viscosity can be easily adjusted during spraying, making it possible to add a larger amount of microparticles. I can do it. As a specific example of the isocyanate component, for example, an isocyanate prepolymer prepared by reacting trimethylolpropane (1 mol) and xylene diisocyanate (3.2 mol) with a molecular weight of 700 is suitable, and as a specific example of the polyol component, for example, A polyester polyol prepared by reacting diethylene glycol (0.9 mol), glycerene (0.3 mol), and adipic acid (1.0 mol) with a molecular weight of 700 is suitable. Other isocyanate components include 2, 4
- Aromatic polyisocyanates such as toluylene diisocyanate, P-phenyl diisocyanate, 4,4'-diphenylmethane diisocyanate, and triisocyanate; aliphatic isocyanates and polyols (ester-based or ether type),
A trifunctional isocyanate prepolymer with a molecular weight of 500 to 3,000, preferably 700 to 2,000.
It is better to use the one. Other polyol components include diols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, hexamethylene glycol, glycerin, trimethylolpropane, trimethylolethane, 1,2, A polyester polyol, which is a trifunctional polyol prepolymer, is formed by reacting a triol such as 6-hexanetriol or pentaerythritol with a dicarboxylic acid such as adipic acid, sebacic acid, maleic acid, or dimer acid. is 500-5000, preferably 700-2000
It is better to use the one. That is, by appropriately selecting from the above-mentioned isocyanate components and polyol components, it is possible to set the desired affinity between the isocyanate component, the polyol component, and the pest control agent, and it is possible to more easily control the desired sustained release. It can be carried out. In addition, by appropriately selecting the molecular weight as described above, it is possible to set appropriate elongation and elasticity so that the formed pest control material is difficult to break due to external force. The pest control agent is mixed into either or both of the isocyanate component and the polyol component. Further, if necessary, 0.3 to 1.0% of a tin-based catalyst such as di-n-butyltin dilaurate or amine-based triethylamine is added to either or both of the isocyanate component and the polyol component. When carrying out the application, the isocyanate component and the polyol component are mixed uniformly to prepare a pest control material. This prepared pest control material is in the form of a viscous liquid and can be cured naturally at room temperature in as little as 20 minutes or as late as 3 days, but preferably within the application time of one house. 3-6 considering
It is preferable to cure the material over a period of time. The prepared pest control material can be applied to the foundations and pillars of houses and other pest intrusion routes such as termites, house ants, and wasps by means of coating or spraying.
It is formed into a layer with an appropriate thickness of ~20 mm and cured as a cured product of urethane polymer. (Example) In order to confirm that the pest control material of the present invention maintains its effect over a long period of time, the following accelerated test was conducted. After placing a sample, which is a product of the present invention, in a 10 cm diameter shear tray, 20 domestic termites were placed therein and brought into contact with the termite for each test period using a conventional method. The samples were obtained by mixing an isocyanate component, which is a urethane prepolymer, a polyol component, a catalyst, an insect control agent, and fine particles in the composition ratio shown in Table 1, and curing the mixture at room temperature. The polyol component is a modified polyether/polyester polyol (molecular weight 700), the isocyanate component is a trifunctional isocyanate made from the reaction of xylene diisocyanate and trimethylpropane, the pest control agent is phoxim and chlordane, and the microparticles are hydroxylated. Aluminum "CL-375" (manufactured by Sumitomo Aluminum Smelting Co., Ltd.) was used in each case.

【table】

[Table] The first test was conducted using the prepared sample without any treatment, and the second test was performed by irradiating the sample with ultraviolet rays at 40°C for 48 hours on each side, and then air-drying it at room temperature for 48 hours. The third test was conducted using a sample that was immersed in running water for 1 hour and then heated and dried at 60°C for 23 hours, which was repeated 10 times. The results of the first test are shown in Table 2, the results of the second test are shown in Table 3, and the results of the third test are shown in Table 4. Looking at the results in Tables 2 to 4, both tests 1 to 3 show effective insecticidal effects. In addition, the insecticidal effect was improved in accelerated tests using weathering and heating operations. In addition, the same results as above were obtained when samples 3, 4, and 5 in Table 1 were tested with only the polyol component and isocyanate component in the same ratio of 100 g:100 g.
Therefore, these results show that the pest control material according to the present invention exhibits pest control effects over a long period of time.

【table】

【table】

[Table] (Effects of the Invention) According to the pest control material and pest control method of the present invention, as is clear from the above explanation, a pest control agent is added to at least one of the isocyanate component and the polyol component, which are urethane polymers. The two liquids made up of fine particles are mixed at the time of construction, applied or sprayed on the entry route of pests, and cured to form a cured product of urethane polymer, so it cannot be used as a conventional pest control agent. It is safe because there is no risk of the pest control agent being washed away by rainwater, etc., causing pollution problems due to unnecessary release of a large amount of pest control agent, or causing harmful effects on the human body due to workers inhaling the insect control agent during construction. Highly sexual. In addition, since the pest control agent does not flow out, it is possible to increase its concentration, and unlike conventional soil treatment, there is no need to spray it over a wide area other than where it is truly needed. By simply applying the method in a band in a narrow area where pests can enter, such as a part of the side of a concrete foundation, the pest control effect will be fully demonstrated, construction will be extremely easy, and costs will be reduced. Moreover, since the microparticles are infiltrated, a micropath of the urethane polymer is formed as a release route for the pest control agent.
The pest control agent diffuses through the cured product of the urethane polymer and is gradually released from the surface of the cured product, which significantly improves the sustained release property and reliably exerts the pest control effect over a long period of time. Not only can the mixing of granules reduce the cost of formulation, but also
The sustained release of the pest control agent can also be easily controlled by adjusting the blending ratio of the microparticles. Furthermore, during construction, it is only necessary to apply the prepared pest control material by coating or spraying, so it can be extremely easily applied even to existing houses, and the construction cost can be further reduced. Of course, the pest control agent and microparticles are mixed into at least one of the isocyanate component, which is a urethane prepolymer, and the polyol component.
Since the liquid is applied or sprayed, after application or spraying, both liquids react to form a continuous layer of cured urethane polymer, and the pests that come into contact with the cured urethane polymer can be attacked. The pest control agent that is slowly released from the surface of the cured product can kill the pests, and is effective in reliably preventing the invasion of pests.

Claims (1)

[Scope of Claims] 1. 30 to 80% by weight of a cured product formed by mixing an isocyanate component that is a urethane prepolymer, a polyol component, an insect control agent, and the isocyanate component and polyol component. 1. A pest control material comprising inorganic fine particles having a blending ratio, the pest control agent and the fine particles being mixed into at least one of an isocyanate component and a polyol component. 2. A pest control agent is added to at least one of the isocyanate component and the polyol component, which are urethane prepolymers, and 30 to 80% by weight of the cured product formed by mixing the isocyanate component and the polyol component. A pest control method characterized by mixing two liquids constituted by mixing with inorganic microparticles having a ratio, and applying or spraying this mixture to a pest intrusion route and curing it to form a cured product of a urethane polymer.