JPH0784765B2 - Construction method of termite proof material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of applying an anti-termite material capable of preventing the termite from damaging a building for a long period of time.

(Prior art) The conventional countermeasure against feeding damage caused by termites such as houses is to spray a large amount (about 100 g / m ² ) of the termite control agent emulsion such as chlordane, granules or wettable powder onto the soil under the floor. Then, the soil was treated.

Further, in recent years, wood that has been pre-impregnated with a termite control agent at the time of building a house has been used as a wood for which damage control has been performed.

Further, recently, a means has been proposed in which a plastic film such as vinyl chloride, polyethylene, or polyvinyl acetate mixed with a termite control agent is used and the plastic film is attached to the concrete part or the wood part of the foundation part under the entire floor.

Further, there is also one in which a termite controlling agent is mixed with a foaming urethane resin and the termite invasion path is filled with the agent to foam.

(Problems to be solved by the present invention) By the way, in the case where the termite control agent is sprayed in the form of an emulsion as described above, in order to maintain the drug effect for a long period such as 10 years, a large amount is required. Must be sprayed. Due to the inconvenience of repeated spraying, it is necessary to use a much higher concentration than that required to actually control termites.

Therefore, a large amount of termite control agents penetrate into the ground by rainwater and mix into groundwater, causing pollution such as polluting well water, so recently only low concentration can be used. For example, in the case of chlordane, a drug containing 6% or more has been treated as a deleterious substance. Also, the concentration of chlordane in bioconcentration has risen 2-3 times in the last few years, and the problem of environmental pollution has been sharply highlighted. The Environment Agency and the Ministry of International Trade and Industry are planning to significantly reduce the amount of imports. Administrative guidance is given. Under such circumstances, there is a tendency to use organic phosphorus-based chemicals as an alternative termite control agent, but if this is applied to the soil under the floor in an effective amount, the atmospheric concentration will be 0.
It may also be 0.4~0.8mg / m ² exceed 2 mg / m ^2. When working in such a high-concentration atmosphere, cholinesterase inhibitory action is exhibited, and there is an occupational health problem that it causes symptoms of lowering blood urea and increasing cholesterol level. This issue is occurring. In addition, wood that has been treated against food damage is expensive because it cannot be treated efficiently, and it is the fact that it is used only for the foundation of the building, and there is a risk of food damage in other parts. There is also doubt about the long-term sustainability of the effect.

In addition, the method using a plastic film is extremely complicated and troublesome, and thus the cost is extremely high. Moreover, if the plastic film has even a few pinholes or there is a peeled part, an ant road is created. There is a problem that termites may enter the house and lack reliability.

Further, the means for mixing with the foamable urethane resin has the following drawbacks when applied to houses.

Termites are mainly harmed in humid places such as kitchens, washrooms, and bathrooms, but the foamable urethane resin is mainly composed of open cells, and water is invaded into the open cells, which is not moisture-proof.

 There is a risk that an ant path will form through the holes in the open cell.

The foamable urethane resin, regardless of whether it is an open-celled body or a closed-celled body, generates heat during foaming, and at that time, the drug decomposes and volatilizes.

It is difficult to control the drug release because the surface area is large and the drug is easily released through the pores of the open-cell body, and conversely, the drug is trapped in the bubbles in the case of the closed-cell body. Is hard to get.

Urethane foam is yellowed and deteriorates over a long period of time, becomes brittle, and may fall into powder, resulting in poor durability.

(Means for Solving Problems) In order to solve the above problems, the present invention is directed to a mixture of a polyol component which is a urethane prepolymer, a termite control agent and fine particles, and an isocyanate which is a urethane prepolymer. Mix the two liquids with the ingredients, and apply or spray this mixture on the side surface of the foundation of the building and the ground surface around the foundation,
It is intended to prevent termites from entering a building by being cured to form a cured coating of urethane polymer.

(Function) Since the termite control agent is contained in the cured product of the urethane polymer in this way, it does not flow out due to rainwater or the like, and therefore the concentration of the termite control agent can be increased. As a result, a high control effect is exhibited only by applying or spraying in a narrow area that is truly necessary.

In addition, by mixing fine particles, the gaps between innumerable fine particles will be filled with the urethane polymer containing the termite 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,
In addition, controlled release can be controlled by the amount of fine particles.

(Examples) Hereinafter, the method of applying the termite control material of the present invention comprises the two liquids of a mixture of a polyol component which is a urethane prepolymer, a termite control agent and fine particles, and an isocyanate component which is a urethane prepolymer. , Mix these two liquids at the time of construction,
It is applied or sprayed on the side surface of the foundation of the building and the ground surface around the foundation and cured to form a cured film of urethane polymer.

The urethane prepolymer contains no solvent and is hard at room temperature.
Since there is no volatilization of termite control agent, it is also possible to control termites.
Used industrially because the agent can be easily mixed at room temperature
be able to. Examples of the termite control agent include chlor
Organochlorine drugs such as den, daeldrin and aldrin
And hoxime, fenitrothion, cyanophos, acef
And organophosphorus drugs such as clospirofos and pyrethro
Id-based drug Permethrin, etc., and carbamate-based drug
Bigon Etc. are preferred, and diethyl meth
Tatramide can be used and these termite control agents can be
0.5 to 6% by weight based on the weight of the cured polymer
Mix in proportions. The termite control agent is
Can be used alone or in combination of two or more control agents
It can also be used together.

As the fine particles, alkaline ones are preferable such as aluminum hydroxide (Al (OH) ₃ ) for decomposing the termite control agent, but alkaline ones such as titanium-based ones are also preferable. Magnesium carbonate (MgCO ₃ ) surface-treated with a silane coupling agent, calcium silicate, silica, talc, diatomaceous earth, etc. can be used. As the acidic substance, inorganic fine particles such as acid clay can be used. The fine particles form a sustained-release path and allow control of the sustained-release property, and also act as a bulking agent and a viscosity modifier. The fine particles are about 30 to 80%, preferably 50 to 70% with respect to the cured product of the urethane polymer.
% So as to occupy a weight mixing ratio.

Further, it is desirable that the fine particles are preferably a suitable combination of large fine particles having a particle size of about 50 to 150 µ and small fine particles of about 5 to 50 µ. As a result, small fine particles are appropriately dispersed between the large fine powders, and the gap is filled with the urethane polymer mixed with the termite controlling agent. As a result, the termites reaching the surface from the inside of the cured product of the urethane polymer. A minute path of the urethane polymer for sustained release of the control agent is formed, and the entrapment of the termite control agent in the urethane polymer and the rapid release from only the surface part are surely suppressed, and the release of the termite control agent is controlled and controlled. The release property will be further enhanced. In addition, the small fine particles exert a so-called rolling action on the particles having a large particle diameter, so that the increase in viscosity can be suppressed, the viscosity can be easily adjusted at the time of spraying, and a larger amount of fine particles can be added. You can

As a specific example of the isocyanate component, for example, an isocyanate prepolymer obtained by reacting trimethylolpropane (1 mol) and xylene diisocyanate (3.2 mol) and having a molecular weight of 700 is preferable, and a specific example of the polyol component is, for example, Diethylene glycol (0.9 mol), glycerin (0.3 mol) and adipic acid (1.0 mol)
A polyester polyol having a molecular weight of 700 is preferable.

Other isocyanate components include 2,4-toluylene diisocyanate, P-phenyl diisocyanate,
Aromatic polyisocyanates such as 4,4′-diphenylmethane diisocyanate, triisocyanate, and xylene diisocyanate, and aliphatic isocyanates such as hexamethylene diisocyanate and lysine diisocyanate are reacted with a polyol (ester-based or ether-based), and 3
A functional isocyanate prepolymer formed and having a molecular weight of 500 to 3000, preferably 700 to 2000 can be used. As the polyol component, other,
Diols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, and hexamethylene glycol, and glycerin, trimethylolpropane, trimethylolethane, 1,2,6-hexanetriol, pentaerythritol, etc. And a dicarboxylic acid such as adipic acid, sebacic acid, maleic acid, and dimer acid are reacted to form a polyester polyol which is a trifunctional polyol prepolymer, and has a molecular weight of 500 to 5000, preferably 700 to 2000's can be used.

That is, by appropriately selecting from the above-mentioned isocyanate component and polyol component, it is possible to set the desired affinity between the isocyanate component, the polyol component and the termite control agent, and to more easily control any sustained release. It can be carried out. Further, by appropriately selecting the molecular weight as described above, it is possible to obtain an appropriate elongation elasticity so that the formed termite control agent is unlikely to be broken by an external force. The termite control agent is mixed with the polyol component, and 0.3 to 1.0% of a catalyst such as tin-based di-n-butyltin dilaurate or amine-based triethylamine is added if necessary.

In the construction, this may be applied or sprayed after uniformly mixing the polyol component and the isocyanate component to prepare the termite-preventing material, but preferably, they are separately supplied to a spreader equipped with a mixing mechanism. It is more efficient to spray while mixing. The range in which the ant-proof material is applied or sprayed on the side surface of the basic concrete and the surrounding ground surface is not particularly limited, but in order to obtain a sufficient ant-proof effect, the ant-proof material is applied to the side surface of the basic concrete or the like. The area to be sprayed is 10 cm or more above the surface of the earth, and the sum of this height and the application range (distance from basic concrete, etc.) on the surrounding ground surface
It is desirable to apply or spray an anti-termite material on the surrounding ground surface so that the length is 20 cm or more.

After application or spraying, the termite control material can be left to stand at room temperature for about 20 minutes at the earliest and 3 days at the earliest, but preferably 3 considering the construction time of one building. It is preferred to cure in ~ 6 hours.

(Experimental example) Polyol component (molecular weight 70
0) 100 parts by weight of dibutyltin laurate as a catalyst 0.05 parts by weight, aluminum hydroxide "CL-375" as fine particles
225 parts by weight (Sumitomo Aluminum Smelting Co., Ltd.) and 5.5 parts by weight of oxime as a termite control agent were added and mixed well.

Next, 50 parts by weight of the above-mentioned mixed solution and an isocyanate component (molecular weight 700), which is a urethane prepolymer, were uniformly mixed to prepare an anti-termite agent.

As a test piece, a concrete block 1 with a length, width, and height of 10 cm, 20 cm, and 40 cm, respectively, as shown in Fig. 1.
A large number of pine woods 2 each having a size of 10 cm, 20 cm, and 10 cm in height, 10 cm, 20 cm, and 10 cm were installed on the upper part of each, and two test bodies were set as a set, as shown in Fig. 1. The lower half of the concrete block 1 was buried in the ground. Then, as shown in FIG. 2, one of the test bodies A was coated with a termite proofing material 4 on the peripheral side surface of the concrete block 1 and the ground surface around the concrete block 1, and the other specimen B was protected. A test specimen for comparison which was not subjected to ant treatment was used. The test piece A, which is subjected to the ant-proof treatment, has a height at which the ant-proof material 4 is applied to the side surface of the concrete block 1, a distance (a distance from the concrete block 1) at which the ant-proof material 4 is applied to the surrounding ground surface, The thickness of the material 4 was set as described in Experimental Examples 1 to 8 of Table 1, and 5 pieces of the termite-prevented test bodies A were prepared for each of the experimental examples, and a total of 40 test bodies A were prepared. The same number of test specimens B for comparison were set in pairs as described above, and they were placed concentrically around the termite nest in the pine forest in Fukiagehama, Kagoshima Prefecture. As described above, it was covered with an opaque polyvinyl chloride plate box 3 to prevent light from entering inside. After 12 months, the condition of each test body was investigated.

As a result of the examination, in the comparative example of the present invention, which was not subjected to the ant control treatment, about 50% of the test bodies were found to have an ant path, and the pine wood was observed to have a great damage.

On the other hand, all the test specimens of the experimental examples that were subjected to the termite prevention treatment of the present invention were
Among the 40 points of the test pair, only one point in Example 6 was found to have an ant path, and no other test body was found to have an ant path. In addition, none of the pine wood was damaged by feeding.

From the above results, it can be seen that the method of applying the termite-preventing material of the present invention is a method with a very great termite-preventing effect.

When constructing on an actual building foundation such as concrete foundation 5 as shown in Fig. 3, seeing from the above test results,
When conditions are set so that the plant is not completely damaged by food, anti-termite material is applied to the entire circumference of the side surface of the foundation under the floor inside the building in consideration of safety.
At this time, this application range is applied to the side surface of concrete up to a height of 10 cm or more (l ₁ ) from the ground surface, and the height of the side surface (l ₁ ) and the distance from the concrete foundation (l ₁ ) at the surrounding ground surface. _If the total of ( ₁ + l ₂ ) is 20 cm or more, the termite control material is applied, and if the thickness is 0.7 mm or more, the termite control effect can be exerted for a long time. this is,
It is extremely superior to the conventional method of constructing the entire surface in terms of workability, cost and working environment.

(Effects of the Invention) According to the method for applying a termite proofing material of the present invention, as is clear from the above description, a mixture of a polyol component which is a urethane prepolymer, a termite control agent, and fine particles, and a urethane prepolymer. It is a product that can be obtained by mixing two liquids with an isocyanate component, which is a polymer, at the time of construction, applying or spraying on the peripheral side surface of the concrete foundation that is the path for the penetration of termites and the surrounding ground surface, and curing it to obtain a urethane polymer cured product. Therefore, the termite control agent may leak out due to rainwater, etc.
It is highly safe because an unnecessarily large amount of termite control agent is released, which causes pollution problems, and an operator does not inhale the termite control agent during construction to adversely affect the human body. In addition, since the termite control agent does not flow out, it is possible to increase its concentration, and unlike the conventional soil treatment, it is not necessary to spray it over a wide area unnecessarily, and the joint part between the foundation part of the house and the soil part and the foundation part. Simply by applying it in a strip shape in a narrow area of the path of infestation of termites such as a part of the side surface of concrete, the control effect is sufficiently exerted and the effect is long-lasting. Further, since it is sufficient to apply or spray only on a truly necessary place, the construction becomes extremely easy and the cost can be reduced. In addition, since minute particles are mixed in, a minute route of the urethane polymer is formed as a release route of the pest control agent, the termite control agent is gradually released, and the sustained release property is remarkably improved to ensure long-term control. Exerts a gradual effect,
In addition, controlled release is easy. In addition, the mixing of fine particles can reduce the cost in compounding. Furthermore, since it is only necessary to spray the anti-termite material adjusted for the construction by means such as coating or spraying, it is possible to perform the construction extremely easily even in an existing house, and the construction cost can be further reduced. Exert the effect of.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the installation state of a test body A which has been treated with an ant-proof and a test body B which has not been treated with an ant-proof, and FIG. 2 is a perspective view for explaining the state of the ant-proof treatment of the test body A in the example. FIG. 3 is a cross-sectional view showing a construction example of a termite proof material for a building foundation. 1 ... concrete block, 2 ... pine wood, 3 ... polyvinyl chloride board box, 4 ... anticide material, 5 ... concrete foundation, 6 ... wood base, 7 ... ground surface.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoshi Utsumi 1-58 Yamate, Aioi City, Hyogo Prefecture No. 2 Ishihara Apartment (72) Inventor Satoshi Kimura 2476-25 Kariya Tennoyama, Ako City, Hyogo Prefecture

Claims (1)

[Claims] 1. A mixture of a polyol component which is a urethane prepolymer, a termite control agent and fine particles, and an isocyanate component which is a urethane prepolymer.
A method for constructing an anti-termite material, which comprises applying or spraying this mixture to the side surface of the foundation of a building and the ground surface around the foundation and curing the mixture to form a cured coating of urethane polymer.