JPH11279321A - Ant-repellent, expandable styrenic resin particle, preparation thereof, and expanded molding using this - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expandable styrenic resin having an ant-repellent property which is an expandable styrenic resin particle wherein a repellent against ants is contained and fixed, completely prevents cohesion and agglomeration between the expanded styrenic resin particle and is capable of preventing fusing inhibition of the expandable styrenic resin particles when obtaining a molding by expansion-molding the expandable styrenic resin particles. SOLUTION: The expandable styrene resin particle, wherein an easily volatilizing foaming agent having a boiling point lower than the softening point of the resin particle is contained in the styrenic resin particle, contains and fixes from 0.1 to 2 wt.% repellent for ants against the expandable styrenic resin particle and furthermore, is coated with from 0.3 to 5 wt.% aluminum hydroxide against the expandable styrenic resin particle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to termite-resistant foamable styrene-based resin particles for producing styrene-based resin foam used for heat-insulating building materials and underfloor heat-insulating materials that are not affected by termites, bark beetles, etc. And a foam molded article formed using the same.

[0002]

2. Description of the Related Art A foam molded article obtained by subjecting pre-expanded particles obtained by pre-expanding expandable styrene resin particles to in-mold foam molding can be molded into an arbitrary shape and has excellent heat insulating performance. It is widely used as a heat insulating material for various building materials, and these heat insulating materials are indispensable building materials from the viewpoint of energy saving of indoor cooling and heating. On the other hand, with the spread of heating, the habitat of termites is moving north, and almost all of the country is suffering damage from houses and other buildings. The damage caused by the termites is no exception in the case of the foamed styrene-based resin insulation material. Ceiling obtained by foaming the expandable styrene-based resin particles in a mold, a wall, a styrene-based resin foam molded article for a building material used as a heat insulating material such as a floor is used adjacent to wood or the like,
In particular, there is a problem that a so-called ant path is formed due to the habit of injuring a termite, a termite or the like that it encounters, and the heat insulation performance is reduced.

As means for solving this problem, a method of adding a termiticide in a polymerization step of styrene resin particles, a step of impregnating a blowing agent after completion of the polymerization, or a method of preventing styrene resin particles or pre-expanded particles from being expanded. There is known a method in which an ant agent is mixed and adhered to form (JP-A-61-44934, JP-A-63-152648). As shown in Japanese Patent Publication No. Hei 7-103004, terminicides such as organochlorine pesticides such as dieldrin, chlordane, and DDT, and CCA agents (copper, chromium, and arsenic agents) which have been conventionally used.
And the like are highly toxic to humans and animals and may cause environmental pollution. Therefore, their use is prohibited or restricted. For example, dieldrin and chlordane are excellent in termiticidal properties, but are highly toxic to humans and animals, and are hardly decomposable and accumulate.Therefore, in Japan, their use as specific chemical substances is prohibited. No agents can be used.

Therefore, in recent years, organophosphorus insecticides such as phoxime and chlorpyrifos, which have relatively low toxicity and are less likely to cause environmental pollution, carbamate insecticides such as propoxer, and pyrethrin insecticides such as permethrin and cyfluthrin have been used. It is also preferable to use these chemicals when imparting termite resistance to a styrene-based resin foam heat insulating material. These termiticides have an excellent termiticidal effect, have low human and animal toxicity, do not accumulate, but are easily decomposed,
Since the microorganism is inactivated by the microorganisms in the soil, simply treating the soil cannot maintain the effect for a long period of time. In particular, since these chemicals are easily decomposed under alkaline conditions, it has been difficult to apply them to basic concrete parts such as houses. Further, either agent even less zoonotic toxicity (phoxim: LD ₅₀ rat 2000 mg / kg or more) contrary, for the fish has a characteristic that exhibits toxicity at low concentrations. For example, the fish toxicity of the organic phosphorus agent foxime (TLm
48 hr carp) is less than 1 ppm, pyrethrins are even more fish toxic, and cyfluthrin is 0.02 pp
m. Both are hardly soluble in water, but dissolve in trace amounts and exhibit fish toxicity.

From the viewpoint of fish toxicity, the aforementioned (Japanese Unexamined Patent Publication No. 61-4 / 1986)
No. 4934, JP-A-63-152648), in which a termiticide is added in the polymerization step and the foaming agent impregnation step,
The transfer of the termiticide to the reaction water cannot be prevented, and a large amount of fish-toxic reaction water requires treatment such as adsorption of activated carbon, which is disadvantageous in industrial production. In the method in which the expandable styrene resin particles or the pre-expanded particles are mixed with the termite-controlling agent, the reaction water is not used, so that the problem of fish toxicity of the reaction water does not occur. However, simply mixing the termite-controlling agent has a weak adhesive force, and the termite-controlling agent is washed away in the cooling process by water cooling during molding, which reduces the termite-controlling effect of the molded product and simultaneously reduces In addition, there is a problem that a termiticide having fish toxicity is transferred. Among the methods disclosed in JP-A-63-159451, foamable styrene-based resin particles are coated with a solution prepared by dissolving a termiticide in an organic solvent having a high affinity for both the styrene-based resin and the termite-controlling agent. In the method, the termiticide is substantially impregnated in the resin particles during the process of diffusing and impregnating the organic solvent into the resin particles, so that the organic solvent is protected from alkaline substances such as concrete and microorganisms in the soil. The decomposition and deactivation of the ant can be suppressed. Also,
There is no problem such as peeling by cooling water or migration into cooling water during molding of the termiticide, which is an advantageous method from the viewpoint of fish toxicity. However, there has been a problem that the surface layer of the expandable styrene resin particles is eroded and softened by the organic solvent, and the expandable styrene resin particles are coalesced into a lump. Thus, industrial production has not been achieved.

Japanese Patent Application Laid-Open No. Sho 64-36629 discloses a method for preventing the coalesced agglomeration of expandable styrene resin particles by dissolving or dispersing an insect repellent in a volatile solvent, and dissolving the solution or dispersion in the expandable styrene resin. A method of spraying on the surface of a system resin particle has been proposed. However, even with this method, the resin particle surface layer is eroded by the volatile solvent immediately after the spraying, and thus it is impossible to completely prevent the resin particles from coalescing and clumping. Further, the publication discloses that after attaching an insect repellent to the resin particles, the resin particles are coated with a lubricant such as a higher fatty acid, a metal soap of the higher fatty acid, or a higher fatty acid amide. This is to prevent the coalescing of the foamed particles during the prefoaming as described in the publication. These lubricants do not have an effect of preventing the foamable styrene resin particles from coalescing and clumping. When the expandable styrene resin particles are packed in a drum or the like and transported, there is a problem that the aggregates of the expandable styrene resin particles are likely to be aggregated particularly at the bottom where a load is applied.

[0007]

The surface layer of the expandable styrenic resin particles is eroded and softened by the organic solvent in which the termiticide is dissolved, so that the expandable styrenic resin particles form a cohesive mass. In order to solve the problem, a powder which does not impair the surface of the expandable styrene resin particles with an organic solvent and does not inhibit the fusion-bonding property of a molded product obtained by foaming the expandable styrene resin particles is used. By covering with foaming, it is possible to prevent coalescence of the expandable styrene resin particles, and it is possible to obtain a good molded body by the same foam molding operation as ordinary expandable styrene resin particles. Become. However, conventionally known as a surface treatment agent for the expandable styrene resin particles, even when coated with an organic powder such as higher fatty acid ester, higher fatty acid amide, metal soap, etc. It cannot be prevented.
In addition, when coated with known metal oxides such as titanium oxide, magnesium oxide, and magnesium hydroxide, metal hydroxide,
In some cases, it is possible to prevent agglomeration of the expandable styrene-based resin particles. However, the fusion-bonding property of a molded body obtained by foaming the expandable styrene-based resin particles is significantly impaired, and the strength of the molded body is reduced. I can't keep it. As described above, in general, when a large amount of the inorganic powder is coated on the expandable styrene-based resin particles, the fusion-bonding property of the molded article is greatly impaired.

Accordingly, the present inventors have conducted intensive studies in view of the above problems, and as a result, when aluminum hydroxide is used, the formation of coalesced lumps between the expandable styrene resin particles is completely prevented. The present inventors have found that it is possible to prevent the fusion-adhesion of a molded product obtained by specific foam molding, and have completed the present invention. An object of the present invention is to eliminate the need for reaction water when the termiticide is contained in the styrene-based resin particles, the termiticide is substantially contained in the resin and fixed, and the effect of the termiticide is maintained for a long time. However, the termiticide does not peel off even with the cooling water during molding, and therefore does not cause environmental pollution such as fish poison due to the cooling water, and the termiticide in which the expandable styrene resin particles are dissolved in an organic solvent. The foamable styrene-based resin particles having a termite-proofing property without preventing the foamable styrene-based resin particles from coalescing and agglomerating each other, and further impairing the fusion property of the molded article obtained by foaming, An object of the present invention is to provide a method for producing the same, and a foam molded article molded using the same.

[0009]

SUMMARY OF THE INVENTION The gist of the invention of claim 1 of the present application is to provide a foaming method containing a foaming agent which is a volatile organic solvent having a boiling point lower than the softening point of the styrene resin particles. 0.1 to 2% by weight of the termiticide with respect to the expandable styrene-based resin particles is fixed to the expandable styrene-based resin particles. Termite-resistant foamable styrene-based resin particles characterized by being coated with aluminum hydroxide in a weight percentage of at least one selected from organic phosphorus-based compounds, pyrethrin-based compounds, and carbamate-based compounds. 1
It is preferable to use at least two species. Claim 3
The gist of the invention is that foamable styrene-based resin particles containing a volatile volatile blowing agent having a boiling point lower than the softening point of the styrene-based resin particles, and both the termiticide and the styrene-based resin A solution in which 0.1 to 2% by weight of an anti-termitic agent is dissolved in an organic solvent having a property with respect to the expandable styrene resin particles, and 0.3 to 5% by weight based on the expandable styrene resin particles. A method for producing termite-resistant foamable styrenic resin particles, characterized in that the termite-proofing agent-containing foamed styrene-based resin particles are fixed by mixing with aluminum hydroxide. In this case, the organic solvent having an affinity for both the termiticide and the styrene-based resin used is one or two selected from hydrocarbons, esters, ethers or ketones.
Preferably, it is at least one species. The gist of the invention of claim 5 is a termite-resistant foamed styrene-based resin molded article obtained by subjecting the pre-expanded particles obtained by pre-expanding the expandable styrene-based resin particles to in-mold foaming. .

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The termiticide in the present invention is excellent in termite control effects, has low toxicity to humans and animals, has a low risk of polluting the environment, and has a long track record of use as a termiticide, from organophosphorus, pyrethrin and carbamate compounds. Selected. That is,
Specifically, so-called phoxime (O, O-diethyl-O- (α-cyanobenzylideneamino) thiophosphate), chlorpyrifos (O, O-diethyl-O-3,
5,6-trichloro-2-pyridylthiophosphate), pyridafenthion (O, O-diethyl-O- (3-oxo-2-phenyl-2)
H-pyridazin-6-yl) thiophosphate) and the like. Examples of pyrethrin-based termiticides include permethrin (3-phenoxybenzyl (1RS) -cis, trans-3- (2,2-dichlorovinyl) -2-2-2dimethylcyclopropanecarboxylate), cyfluthulin (cyano (4-fluoro -3-phenoxyphenyl) -methyl-3- (2,2-dichloroethenyl) -2,2-dimethylcyclopropanecarboxylate), bifenthrin ((2-methyl [1,1-biphenyl] -3-yl) methyl = 3- (2-
Chloro-3,3,3-trifluoro-1-propenyl) -2,2-dimethylcyclopropanecarboxylate) and the like. As the carbamate termiticide, propoxer (2-
Isopropoxyphenyl N-methyl carbamate), Nac (1-naphthyl N-methyl carbamate) and the like.

In the present invention, the termiticide is formed by coating the foamable styrene resin particles with an organic solvent solution of the termiticide in an amount of 0.1 to 2% by weight based on the expandable styrene resin particles. Is contained and fixed in the expandable styrene resin particles. Preferably it is 0.2 to 1% by weight. If the amount is less than 0.1% by weight, the termite-controlling effect of the molded article tends to be insufficient, and if the amount exceeds 2% by weight, it is difficult to suppress the coalescence of the expandable styrene resin particles. The method for fixing the termiticide in the expandable styrene resin particles in the present invention utilizes the property that the termiticide is dissolved in an organic solvent such as aromatic hydrocarbon, alcohol, and acetone. That is, using an organic solvent having an affinity for both the styrene resin and the termiticide,
A solution in which the termiticide is dissolved is mixed with the expandable styrene-based resin particles, and the termite-controlling agent is contained and fixed to the surface layer of the expandable styrene-based resin particles. The term “fixing contained in the foamable styrene-based resin particle surface layer” means that the organic solvent softens the styrene-based resin particle surface layer by covering the foamable styrene-based resin particles in the form of an organic solvent solution with a termiticide. It dissolves and the termiticide enters the resin. Organic solvents that dissolve the termiticide used include hydrocarbons such as hexane, cyclohexane, toluene, ethylbenzene and decalin, ethers such as ethyl ether and dioxane, ketones such as acetone and methyl ethyl ketone, and esters such as ethyl acetate. Are suitable. In particular, an aromatic petroleum-based solvent which has a high affinity for both the termiticide and the styrene-based resin and does not adversely affect the cell structure and moldability of the foam is preferred.

In the present invention, the surface of the expandable styrene resin particles is coated with aluminum hydroxide. The particle size of the aluminum hydroxide used here is preferably from 1 to 50 μm, more preferably from 5 to 20 μm. Particle size 1μm
In the following, sufficient anti-coalescing properties cannot be obtained, and 50 μm
If it exceeds m, it becomes easy to peel off from the expandable styrene resin particles. The amount of aluminum hydroxide to be added depends on the type of solvent for the termitic agent to be coated and the amount of the termiticide solution to be added.
% By weight is preferred. If the content is less than 0.3% by weight, the coalescing prevention of the expandable styrene resin particles tends to be insufficient.
This is because the amount of the styrene-based resin particles to be coated does not increase even if added in excess of% by weight. As a method for coating the expandable styrene resin particles with the termiticide in the present invention, known mixing equipment can be used. For example, by using a tumbler, a ribbon blender, a Nauter mixer, or the like to mix the expandable styrene-based resin particles, and an organic solvent solution in which a termiticide is dissolved with aluminum hydroxide, agglomeration of the resin particles is performed. While preventing, the termiticide can be contained and fixed in the resin particles. At this time, at the same time, an agent for preventing expansion of the foamed particles at the time of prefoaming, a shortening agent for the molding time, a fusion promoting agent for the molded article, and the like may be added. In addition, in a method in which a normal flake or granular termiticide is directly stirred and mixed with the expandable styrene-based resin particles, the termiticide is easily peeled off at the time of preliminary foaming, molding, etc. At the same time, there is a problem that a fish-toxic termiticide migrates into the steam drain during prefoaming or into the formed cooling water.

Examples of the resin material constituting the expandable styrene resin particles of the present invention include, in addition to styrene, styrene derivatives such as α-methylstyrene, vinyltoluene, and parachlorostyrene. In addition, for example,
Acrylonitrile, acrylic acid, acrylic acid ester,
A monomer copolymerizable with styrene such as methacrylic acid ester and maleic anhydride or a crosslinkable monomer such as divinylbenzene can be used in combination. A copolymer or styrene homopolymer of 50% by weight or more is preferred. In order to obtain styrene resin particles, known methods such as a general suspension polymerization method and an extruded pellet method can be used. Expandable styrene resin particles can be obtained by appropriately adding a volatile foaming agent to these styrene resin particles. The method of adding a foaming agent may be a method of adding a foaming agent during or after the completion of polymerization, or a method of adding a foaming agent during extrusion or the like.

As the volatile volatile blowing agent, a gaseous or liquid organic compound having a boiling point equal to or lower than the softening point of the styrene resin particles at normal pressure is suitable, and propane, butane, pentane, hexane, cyclohexane, and the like are suitable. Hydrocarbons such as pentane are suitable. These foaming agents may be used alone or in combination of two or more. The blowing agent is 1 to 1 with respect to the styrene resin.
0% by weight impregnation. Further, if necessary, a plasticizer such as cyclohexane and toluene, a coloring agent such as a dye, an antioxidant, and a lubricant (for example, liquid paraffin, fatty acid ester,
Various additives such as metal soaps, flame retardants, flame retardant aids, and antistatic agents can be added.

[0015]

EXAMPLES Examples of the present invention will be described below, but the present invention is not limited to these examples. Example 1 n-butane (about 70%) and i-butane (about 3%) were used as blowing agents.
0%) and 1.5% by weight of toluene as a foaming aid to expandable styrene resin particles having a particle size of 0.9 to 1.2 mm, and a pyrethrin-based termiticide. 1% by weight of a petroleum-based solution of permethrin (80% by weight of the active ingredient) and 1.6% by weight of aluminum hydroxide (particle size: about 15 μm) were added and mixed to coat the surface of the expandable styrene resin particles. did. At the time of mixing, the termite-controlling agent solution and the aluminum hydroxide were added to each of 10 kg of the expandable styrene resin particles using a tumbler having an internal volume of about 30 L, and the mixture was mixed at 30 revolutions per minute for about 15 minutes to prevent mixing. Expandable styrene resin particles coated with an ant solution and aluminum hydroxide were obtained. About the obtained expandable styrene resin particles, after confirming the fluidity immediately after coating, 48 hours at normal temperature.
After leaving for a period of time, the termiticide solution was completely impregnated and diffused into the expandable styrene resin particles. In addition, when leaving the drum, the load (approximately 50 gf) considered to be applied to the expandable styrene resin particles on the bottom of the drum can is assumed on the assumption that the drum is filled after coating.
/ Cm ² ). The expandable styrene resin particles were heated with steam in a small batch type prefoaming machine under normal pressure, and prefoamed to a bulk ratio of about 60 times. The obtained pre-expanded particles were aged at 23 ° C. for 24 hours.
Using a foam molding machine having a size of 400 mm x 50 mm (ACE-3 type, manufactured by Sekisui Koki Seisakusho Co., Ltd.), foaming was performed by heating with steam having a gauge pressure of 0.8 kgf / cm ² for about 30 seconds, After cooling by water cooling, remove from mold cavity, 3
A plate-like foam molded article of 00 mm × 400 mm × 50 mm was obtained.

EXAMPLE 2 A pyrethrin-based termiticide was added from permethrin to cyfluthulin (50% by weight of an active ingredient in a petroleum solution), the amount of the active ingredient was 0.4% by weight, and the amount of aluminum hydroxide was 0.8. Extensible styrene resin particles were obtained in the same manner as in Example 1 except that the weight% was changed. The obtained expandable styrene resin particles were pre-foamed in the same manner as in Example 1 and subjected to in-mold foam molding to obtain a plate-shaped foam molded article of 300 mm × 400 mm × 50 mm. Example 3 The termiticide was added to organophosphorus phoxim (active ingredient 65% by weight petroleum-based solution), the addition amount was 0.2% by weight of the active ingredient, and the addition amount of aluminum hydroxide was 0.5% by weight. Except having changed, it carried out similarly to Example 1, and obtained the expandable styrene resin particle. The obtained expandable styrene resin particles were pre-foamed in the same manner as in Example 1 and foamed in a mold to obtain a 300 mm × 4
A 00 mm × 50 mm plate-shaped foam molded article was obtained.

Example 4 Expandable styrene resin particles were prepared in the same manner as in Example 1 except that the amount of phoxime was changed to 0.4% by weight of the active ingredient and the amount of aluminum hydroxide was changed to 1% by weight. Obtained. The obtained expandable styrene resin particles were pre-expanded in the same manner as in Example 1 and foamed in a mold to obtain 300 mm × 400 mm.
A × 50 mm plate-like foam molded article was obtained. Example 5 Expandable styrene resin particles were obtained in the same manner as in Example 1, except that the addition amount of foxime was changed to 1% by weight of the active ingredient and the addition amount of aluminum hydroxide was changed to 1.6% by weight. The obtained expandable styrene resin particles were pre-expanded in the same manner as in Example 1 and foamed in a mold to obtain 300 mm × 400 mm.
A × 50 mm plate-like foam molded article was obtained.

Example 6 Example 1 was repeated except that the amount of phoxime was changed to 2% by weight of the active ingredient and the amount of aluminum hydroxide was changed to 3% by weight.
In the same manner as in the above, expandable styrene resin particles were obtained. The obtained expandable styrene resin particles were pre-expanded in the same manner as in Example 1 and foamed in a mold to obtain 300 mm × 400 mm.
A × 50 mm plate-like foam molded article was obtained.

COMPARATIVE EXAMPLE 1 The expandable styrene resin particles described in Example 1 to which no termiticide solution and aluminum hydroxide were added were prefoamed in the same manner as in Example 1, foamed in a mold, and molded into a 300 mm × 400 mm.
A 50 mm × 50 mm plate-like foam molded article was obtained. Comparative Example 2 Expandable styrene resin particles were obtained in the same manner as in Example 1 except that aluminum hydroxide was not added. After standing at room temperature for 48 hours, all of the expandable styrene resin particles were coalesced in a lump and could not be pre-expanded.

Comparative Example 3 Expandable styrene resin particles were prepared in the same manner as in Example 1 except that an anti-termitic agent was added to cyfluthrin so that the added amount was 1% by weight of the active ingredient, and aluminum hydroxide was not added. I got After standing at room temperature for 48 hours, all of the expandable styrene resin particles were coalesced in a lump and could not be pre-expanded. Comparative Example 4 Expandable styrene resin particles were obtained in the same manner as in Example 1 except that the termiticide was added to phoxime so that the added amount was 1% by weight of the active ingredient, and aluminum hydroxide was not added. . After standing at room temperature for 48 hours, all of the expandable styrene resin particles were coalesced in a lump and could not be pre-expanded.

COMPARATIVE EXAMPLE 5 An anti-termitic agent was added to foxime so that the added amount was 1% by weight of the active ingredient, and the added amount of aluminum hydroxide was 0.1%.
Extensible styrene resin particles were obtained in the same manner as in Example 1 except that the weight% was changed. After standing at room temperature for 48 hours, almost all of the expandable styrene resin particles were coalesced into a lump and could not be pre-expanded. Comparative Example 6 The termiticide was added to foxime, and the amount added was 1% by weight of the active ingredient.
Silica gel (average particle size: 1.
(8 μm) was added in the same manner as in Example 1 except that 0.8% by weight was added to obtain expandable styrene resin particles. The obtained expandable styrene resin particles were pre-expanded in the same manner as in Example 1 and foamed in a mold to obtain a 300 mm × 400 mm × 50.
mm plate-shaped foam molded article was obtained.

Comparative Example 7 The termiticide was added to foxime, and the amount added was 1% by weight of the active ingredient.
Example 1 was repeated except that 1.6% of magnesium hydroxide (average particle size of about 40 μm) was added in place of aluminum hydroxide.
In the same manner as described above, expandable styrene resin particles were obtained. The obtained expandable styrene resin particles were pre-foamed in the same manner as in Example 1 and foamed in a mold to obtain a 300 mm × 400 mm × 5.
A 0 mm plate-shaped foam molded article was obtained. Comparative Example 8 Termiticide was added to foxime, and the amount added was 1% by weight of active ingredient.
Titanium oxide (average particle size 7n) in place of aluminum hydroxide
Expandable styrene resin particles were obtained in the same manner as in Example 1, except that 1.6% by weight of m) was added. After standing at room temperature for 48 hours, almost all of the expandable styrene resin particles were coalesced in a lump and could not be pre-expanded.

COMPARATIVE EXAMPLE 9 The termiticide was added to foxime, and the amount added was 1% by weight of the active ingredient.
Expandable styrene resin particles were obtained in the same manner as in Example 1 except that 1.6% by weight of aluminum oxide (average particle size: about 20 nm) was added instead of aluminum hydroxide. Room temperature 4
After leaving for 8 hours, almost all of the expandable styrene resin particles were coalesced into a lump and could not be pre-expanded. Comparative Example 10 The termiticide was added to foxime, and the amount added was 1% by weight of the active ingredient.
Example 1 was repeated except that 1.6% by weight of calcium carbonate (average particle size of about 40 nm) was added instead of aluminum hydroxide.
In the same manner as described above, expandable styrene resin particles were obtained. Room temperature 48
After standing for a long time, almost all of the expandable styrene resin particles were coalesced in a lump and could not be pre-expanded.

Comparative Example 11 The termiticide was added to foxime, and the amount added was 1% by weight of the active ingredient.
Talc instead of aluminum hydroxide (particle size about 40μm)
Was obtained in the same manner as in Example 1 except that 1.6% by weight of styrene resin was added. After standing at room temperature for 48 hours,
Almost all of the expandable styrene resin particles were coalesced in a lump and could not be pre-expanded. Comparative Example 12 The termiticide was added to foxime, and the amount added was 1% by weight of the active ingredient.
Expandable styrene resin particles were obtained in the same manner as in Example 1 except that 1.6% by weight of zinc stearate (average particle size: about 15 μm) was added instead of aluminum hydroxide. Room temperature 4
After leaving for 8 hours, almost all of the expandable styrene resin particles were coalesced into a lump and could not be pre-expanded.

Comparative Example 13 Expandable styrene resin particles were prepared in the same manner as in Example 1, except that the amount of phoxime was changed to 0.03% by weight of the active ingredient and the amount of aluminum hydroxide was changed to 1% by weight. Obtained. The obtained expandable styrene resin particles were pre-foamed in the same manner as in Example 1 and foamed in a mold to obtain a 300 mm × 400 m
An mx50 mm plate-like foam molded article was obtained. Comparative Example 14 Example 1 was repeated except that the termite-controlling agent was changed to organophosphorus chlorpyrifos (crystalline powder) and 1% by weight of the active ingredient was added as a powder without dissolving in a solvent, and aluminum hydroxide was not added. In the same manner, expandable styrene resin particles whose surface was coated with a termiticide were obtained. The obtained expandable styrene resin particles were pre-foamed in the same manner as in Example 1 and subjected to in-mold foam molding to obtain a plate-shaped foam molded article of 300 mm × 400 mm × 50 mm.

Examples 1 to 6 and Comparative Examples 1 to 1 described above.
Table 1 shows the addition amounts of the termiticide and anti-coagulant and the cohesiveness of the resin particles after coating with aluminum hydroxide.
After drying the plate-shaped molded bodies obtained in Examples 1 to 6 and Comparative Examples 1 to 14 at 40 ° C. for 24 hours, the fusion degree and termite resistance of the molded bodies were evaluated by the following methods. The results are shown in Table 2. (Measurement method of fusion degree) External shape 300mm × 400mm × 5
The foamed molded article having a diameter of 0 mm is broken at the center thereof so as to be divided into two parts, and the number of broken particles of the broken surface itself is divided by the number of all particles in the broken surface. Then, the value multiplied by 100 was taken as the fusion degree. The number of the particles was measured visually. (Evaluation of Fusing Property) Based on the degree of fusing calculated as described above, the following judgment was made. Evaluation ：: The fusion degree of the molded body was 85% or more. Evaluation X: The fusion degree of the molded body was less than 65%.

(Test Method for Evaluation of Termite Resistance) Evaluation was made in the following manner with reference to the comprehensive test method for termite efficacy specified in the Japan Wood Preservation Association Standard No. 11 (1).
That is, moisture is contained in the degreasing surface, a gypsum plate is placed thereon, and water is supplied through the gypsum plate. A glass ring having a diameter of 41 mm and a height of 50 mm is placed on the gypsum plate. A specimen cut out from the foamed molded article and a test insect were placed therein, bred for 21 days, and food damage was visually observed. In addition, the weight loss rate of the sample was measured. Specimen: 20 × 20 × 10mm Test insect: House termite (Coptotermes formosanus SHIR)
AKI) 50 termites for each test condition: 28 ° C. × 21 days Number of repetitions: n = 3 (visual evaluation of termite resistance) The samples tested as described above were evaluated as follows. Evaluation ：: No damage due to damage Evaluation △: Scar marks are observed on a part of the surface of the sample Evaluation X: Damage to the inside of the sample did.

[0028]

[Table 1]

[0029]

[Table 2]

Further, for some of the examples and comparative examples,
The fish toxicity of the cooling water during molding was evaluated by the following method, and the results are shown in Table 3. (Evaluation method of fish toxicity) Cooling wastewater (mixed water of steam drain water and cooling water) at the time of molding was collected (about 40 L), and 10 goldfish having a body length of about 5 cm were put into each of them and observed for 72 hours. In addition, as a reference example, water obtained by adding 5 ppm of an organic phosphorus agent to the cooling water for molding of a normal product (without an anti-termitic agent) was similarly observed.

[0031]

[Table 3]

[0032]

According to the present invention, the termitic agent is contained in the styrene resin particles without the need for reaction water, and the termitic agent is substantially contained in the resin and fixed. The effect lasts for a long time, and the termiticide does not peel off even with the cooling water during molding, so there is no risk of causing environmental pollution such as fish poison due to the cooling water, and the expandable styrene resin particles dissolve in the organic solvent Foamable styrene-based resin particles do not form a coalesced mass even if they contain a termite-controlling agent, and yet have foam-resistant properties that do not impair the fusion-bonding properties of the molded article obtained by foam molding. Styrene resin particles can be obtained. The molded article obtained by subjecting the pre-expanded particles obtained by pre-expanding the expandable styrene-based resin particles according to the present invention to in-mold foam molding is substantially a heat-insulating and water-resistant foamed resin. Because it is sealed in the resin of the molded body, it can prevent decomposition and deactivation of the termiticide due to microorganisms in the soil and alkalinity of concrete, and can maintain the effectiveness of the termiticide stable for a long time,
It can also be applied to concrete surfaces, which was difficult in the past. In addition, unlike soil spraying, the termiticide does not migrate to groundwater or the like, and the risk of causing environmental pollution can be significantly reduced.

Claims (5)

[Claims] 1. An expandable styrene resin particle containing a volatile volatile foaming agent having a boiling point lower than the softening point of the styrene resin particles in the styrene resin particles. Containing 1 to 2% by weight of termiticide,
Furthermore, 0.3 to 5 with respect to the expandable styrene resin particles.
Termite-resistant foamable styrene-based resin particles, which are coated with aluminum hydroxide in an amount of about 0.1% by weight. 2. The termitic-resistant foamable styrene resin particles according to claim 1, wherein the termiticide is one or more selected from an organic phosphorus compound, a pyrethrin compound and a carbamate compound. 3. Affinity to both expandable styrene resin particles containing a volatile volatile blowing agent having a boiling point lower than the softening point of the styrene resin particles, and both the termiticide and the styrene resin. A solution in which 0.1 to 2% by weight of an anti-termitic agent is dissolved in an organic solvent having the formula: 0.1 to 2% by weight based on the expandable styrene resin particles;
3. The expandable styrene resin particles containing the termite-controlling agent and fixed by mixing with 3 to 5% by weight of aluminum hydroxide to obtain aluminum hydroxide. Method for producing termite-resistant foamable styrenic resin particles. 4. The organic solvent according to claim 3, wherein the organic solvent having an affinity for both the termiticide and the styrene-based resin is one or more selected from hydrocarbons, esters, ethers, and ketones. Method for producing termite-resistant foamable styrenic resin particles. 5. A foamed styrene-based resin article having termite resistance obtained by subjecting the pre-foamed particles obtained by prefoaming the expandable styrene-based resin particles according to claim 1 to in-mold foaming.