JPH0750922A - Soil substitute - Google Patents

Abstract

PURPOSE:To obtain a lightweight soil substitute, having air and water permeabilities, further fertilizer and water holding properties and supporting properties of supporting roots of a plant, capable of suppressing the growth of molds, etc., and suitable as the rooftop of a building or a verandah, etc., of an apartment house. CONSTITUTION:This soil substitute is obtained by fixing antimicrobial particles 3 which are hydrophilic inorganic particles supporting an antimicrobial agent on the surface of foam particles 1 made of a synthetic resin with a urethane polymer 4.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a soil substitute,
Alternatively, the present invention relates to a soil substitute that is added to soil and used as a soil improving material to suppress the generation of mold and the like.

[0002]

2. Description of the Related Art In recent years, green spaces such as gardens are often provided on a part of a building such as a roof of a building, a balcony of a condominium, a terrace, etc. The soil is brought in and plants are cultivated in the soil.

[0003] Such soil is usually required to have a good quality of soil having excellent drainage, water retention, water permeability, air permeability, fertilizer retention and supportability. It is difficult to obtain good soil. In addition, the bulk density of natural soil often exceeds 1 (g / cm ³ ), and the total weight of the soil soil consisting of such soil becomes large, which adversely affects buildings with limited loading capacity. May be given.

Therefore, in order to avoid the above adverse effect,
For example, the soil substitute disclosed in Japanese Patent Publication No. 55-40005 is known. The soil substitute is a mixture of hydrophobic polymer foam particles, hydrophilic inorganic foam particles, natural organic substances and inorganic sandy substances,
It is lighter than natural soil.

In addition, soil pathogenic bacteria cause diseases on plants cultivated in soil, such as vegetables, fruits, plants and trees. For example, tomatoes, cucumbers, radishes, burdock and other open-fields caused by Viseum, seedling wilting and root rot in greenhouses or hydroponics, radish, turnip, cabbage cabbage root-root disease or pea caused by Aphanomyces spp. Root rot, half-body atrophy caused by Particillium, root rot caused by Plasmodiophora, white rot caused by Cortisium, tulip rot caused by Phytophthora, tulip root rot caused by Pythium, turf caused by Pythium Many diseases are caused by soil pathogens such as baldness of spring.

For the prevention and treatment of these diseases, copper, inorganic organic copper salts, thiuram, benomyl agents, thiophanate methyl agents,
Dithianon / copper, TPN, iprodione, captan,
Sterilizing and antibacterial agents such as mepronil, flutolanil, benomyl, validamycin, penciclone, PCNB, ecromezole, metalaxyl, chloropicrin, methylisocyanate, methyl bromide, difortan, trichlamide and the like are used.

[0007]

However, in the above-mentioned conventional soil substitute, when used for soil, hydrophobic polymer foam particles, hydrophilic inorganic foam particles, natural organic substances and inorganic sandy substances are used. Due to the large difference in density between and, when the water is submerged such as in the case of heavy rain, the foam particles with a low density float to the surface of the soil or migrate to the upper layer, while the inorganic sandy material with a high density May settle in the lower layer of the soil.

[0008] Therefore, in the above-mentioned conventional construction, each constituent material is separated, and the foam particles having a low density gather on the surface layer and flow out to the outside to reduce the whole amount of the cultivated soil, so that the plant to be cultivated is reduced. This causes a problem that supportability is deteriorated.

Further, when the humidity is high such as during the rainy season, molds and the like are generated due to the fertilizer components in the soil, which spoils the aesthetics and causes diseases such as root rot in the planted plant. , When using an antibacterial agent as a pesticide in order to avoid the above diseases, there is concern about the effect of residual pesticides on the human body, especially in recent years pesticide contamination of rivers and drinking water due to the large use of pesticides on golf courses On the other hand, plants also suffer from pesticide-induced disease, which causes problems such as gray mold of eggplant caused by pesticide-resistant bacteria, and phytotoxicity such as copper-induced plant growth failure.

[0010]

The soil substitute of the present invention comprises:
In order to solve the above problems, on the surface of the synthetic resin foam particles, hydrophilic inorganic particles, at least selected from the group consisting of hydrophilic inorganic foam particles and animal and plant-based organic soil improver It is characterized in that one modifier and an antibacterial agent are fixed by an adhesive.

As the above-mentioned synthetic resin foam particles,
Granularly formed synthetic resin foam, or synthetic resin foam is pulverized and granulated, the synthetic resin used is polyethylene, polystyrene, polypropylene, polyurethane, synthetic rubber, etc., In particular, foam particles formed of polystyrene and formed into granules, or crushed particles of polystyrene foam are suitable, and the expansion ratio thereof is 2 to 60 times, more preferably 40 to 50 times, and the particle size is 0.1 to 40 mm. It is more preferably 1 to 5 mm.

The foam particles include a regenerated product obtained by crushing a foamed molded product that has been used once with a crusher, and a processed product whose volume has been reduced by heat or a solvent. In addition, the synthetic resin used may have an auxiliary agent such as a flame retardant. It should be noted that any known method may be adopted for producing the foam-molded article or the foam particles, and the production method is not limited.

As the adhesive, a reactive adhesive such as a mixture of a water-reactive urethane prepolymer and water, an ethylene-vinyl acetate copolymer emulsion, poval, an acrylic resin, a regenerated rubber, a butyl rubber or the like is evaporated. A mold adhesive may be mentioned. In addition, in the above-mentioned evaporation type adhesive,
It is used after diluting with a dispersion medium such as water, and a drying step is required after the adhesion in order to scatter the dispersion medium. Therefore, the reactive adhesive is more preferable because the drying step after the adhesion can be omitted.

As the water-reactive urethane prepolymer, a substance having a free isocyanate group, for example, a hydrophilic polyether polyol and an excess amount of the isocyanate compound, are reacted so as to generate a free isocyanate group. Various urethane prepolymers thus obtained are used.

Examples of the hydrophilic polyether polyols include polyethylene glycol alone, propylene glycol, polypropylene glycol, butanediol, 1,6-hexanediol, trimethylolpropane,
Examples thereof include polyhydric alcohols such as trimethylolethane, pentaerythritol, sorbitol, polyester polyols and bisphenol A, and also homopolymers and copolymers of alkylene oxides such as ethylene oxide and propylene oxide.

Further, as the above-mentioned isocyanate compound, tolylene diisocyanate, 3,3'-bitrylene-4,
4'-diisocyanate, xylylene diisocyanate,
Examples thereof include compounds having a plurality of isocyanate groups, such as diphenylmethane-4,4'-diisocyanate, 3,3'-dimethyl-diphenylmethane-4,4'-diisocyanate, hexamethylene diisocyanate, and naphthalene-1,5-isophorone diisocyanate.

The water-reactive urethane prepolymer may be stabilized by adding a masking agent such as sodium acid sulfite to mask the isocyanate groups of the water-reactive urethane prepolymer with the masking agent. Further, the water-reactive urethane prepolymer, ethylene glycol monomethyl ether adipic acid ester,
Additives such as cross-linking aids such as the isocyanate compounds exemplified above can be blended.

It should be noted that the amount of water added to the water-reactive urethane prepolymer is the same as that of the water-reactive urethane prepolymer.
With respect to 100 parts by weight, water 500 to 5000 parts by weight, preferably,
1000 to 4000 parts by weight.

The hydrophilic inorganic particles and the hydrophilic inorganic foam particles have a high base exchange capacity, and
There is no particular limitation as long as it has a high water retention capacity, but a material having a base exchange capacity (preferably 5 meq / 100 g or more) and a water retention capacity (PF value indicating effective water retention amount of 1.5 to 3.0) is preferable. is there.

For example, as the hydrophilic inorganic particles, zeolite, bentonite, montmorillonite, calcium phosphate, amorphous calcium phosphate, calcium hydrogen phosphate, hydroxyapatite, fluoroapatite, diatomaceous earth and the like are used.

On the other hand, as hydrophilic inorganic foam particles,
Vermiculite, perlite, diatomaceous earth calcined product (for example, Isolite CG manufactured by Isolite Co., Ltd.) and the like are used.

The above-mentioned animal and plant organic soil improving material is not particularly limited as long as its surface is easily wet with water and has water retention property. For example, peat, peat moss, bark compost, charcoal ash and the like are used. .

The size of the modifier containing the hydrophilic inorganic particles, the hydrophilic inorganic foam particles, and the animal and plant-based organic soil conditioner is too large. Since the number of bonding points with the material is reduced and the adhesive force between them is reduced, it is preferably ⅕ or less of the particle diameter of the foam particles. In addition, in this specification, a particle diameter shows the major axis of a granular body. In the case of a fibrous material such as peat moss, its thickness is preferably ⅕ or less of the particle diameter of the foam particles.

As other additives, chemical fertilizers, animal and plant organic fertilizers, or polymer soil improvers such as
A water absorbent polymer, an ion exchange resin, etc. may be added. However, the above-mentioned additive is used in a range that does not impair the adhesiveness of the surface of the foam particles with at least one modifier selected from the modifier group.

The above-mentioned foam particles, the modifier and the antibacterial agent are mixed to obtain a first mixture. The mixing ratio is such that the foam particles are at least one selected from the X volume part and the modifier group. If the total with the antibacterial agent is (100-X) volume part, 30
≦ X ≦ 95 is preferable.

That is, when the amount of the foam particles is less than 30 parts by volume, the adhesion between the foam particles, the modifier and the antibacterial agent is deteriorated, and the lightness is impaired. On the other hand, when the content of the foam particles exceeds 95 parts by volume, water retention, fertilizing properties and antibacterial properties deteriorate.

While agitating the above-mentioned first mixture well, a predetermined amount of an adhesive is added to the first mixture and dispersed to obtain a second mixture. When a water-reactive urethane prepolymer and water are used as the adhesive, the amount of water added varies depending on the mixing ratio of the foam particles and the modifying agent, but as the modifying agent ratio increases. , Use a lot of water.

In this case, the standard of the amount of water added is such that the foam particles and the entire surface of the modifier are not completely covered, but as described later, when the water-reactive urethane prepolymer is added. In addition, the amount is selected so that the foam particles and the modifier do not separate.

The water-reactive urethane prepolymer is added to the second mixture while stirring the second mixture. As a result, each isocyanate group of the water-reactive urethane prepolymer reacts with water present between the foam particles and the modifier or between the modifiers to be crosslinked, whereby the above water-reactive urethane prepolymer is crosslinked. The polymer has a three-dimensional network structure, gels and solidifies, and becomes a water-insoluble urethane polymer.

At this time, the modifier and the antibacterial agent are adhered to the surface of the foam particles by the urethane polymer, and the urethane polymer is adhered between the modifiers and between the modifier and the antibacterial agent. It is glued and fixed by.

When at least one of the hydrophilic inorganic particles and the hydrophilic inorganic foam particles is used in combination with the animal and plant organic soil amendment material, the hydrophilic inorganic particles and the hydrophilic inorganic foam particles are At least one of them, foam particles, and water were mixed to prepare a second mixture, and after adding the water-reactive urethane prepolymer to the second mixture, immediately add an animal and plant organic soil improver. Good. Thereby, the organic soil conditioner excellent in water retention and fertilizer retention can be disposed on the surface side and exposed.

As the antibacterial agent, an antibacterial metal, for example, at least one metal selected from gold, silver, zinc, copper, tin, lead, arsenic, platinum, iron, antimony, nickel, aluminum, barium, cadmium and manganese, Alternatively, a mixture thereof, a metal compound thereof, or an aqueous solution thereof can be used.

In addition to the above, commercially available antibacterial agents, for example, Zeomic (manufactured by Sinanen), Apacider (manufactured by Sangi), Novalon (manufactured by Toagosei), Ionpure (manufactured by Ishizuka Glass), AIS (catalyst formation) Industrial products) are also possible, but not limited to these.

Further, hydrophilic inorganic particles or antibacterial particles in which hydrophilic inorganic foam particles carry an antibacterial agent may be fixed to the surface of the foam particles by adhesion. The above-mentioned antibacterial particles are, for example, those obtained by mixing antibacterial metal ions and granulating a slurry containing amorphous calcium phosphate particles.

The amorphous calcium phosphate (amorphous)
Calcium phosphate: hereinafter abbreviated as ACP) A slurry containing particles is prepared by adding 0.1 to 10% by weight of a water-soluble polymer dispersant, for example, ammonium triacrylate salt, to a calcium hydroxide suspension with stirring. After adding 0.1 to 3% by weight to obtain a mixed solution, the pH of the mixed solution with stirring is adjusted to 10 to 5 by adding an aqueous phosphoric acid solution to contain ACP fine particles having a particle size of about 0.1 μm or less. .

In this slurry, an antibacterial metal powder, an antibacterial metal compound, or a mixture of an aqueous solution thereof is mixed in an amount of 50% by weight or less, and the mixture is granulated by a spray drying granulation method or the like to form antibacterial particles. Got

The above-mentioned ACP fine particles were subjected to powder X-ray analysis, and from the pattern thereof, calcium phosphate [Ca ₃ (PO ₄ ) ₂
nH ₂ O] and its pattern is broad, confirming that it is amorphous calcium phosphate. In addition, the ACP fine particles are considered to be an electrostatically active substance because they contain water of crystallization, and it is presumed that various microbes and viruses are easily adsorbed.

Further, since the obtained antibacterial particles have a large specific surface area, the particle size of the ACP fine particles in the slurry is 0.1 μm or less. Further, the antibacterial metal powder and the antibacterial metal compound powder to be added are added. It is desirable that the particle size of the is less than 20 μm. Moreover, it is desirable to mix the slurry with the antibacterial metal powder, the antibacterial metal compound powder or the antibacterial metal aqueous solution added at room temperature.

However, the ACP fine particles in the slurry are
If it exceeds 90% by weight, the viscosity of the slurry increases, so
Not suitable for granulation. By changing the content of ACP fine particles in the slurry within the range of 1 to 90% by weight, antibacterial particles having a desired average particle diameter can be obtained.

As the granulation method, if the obtained antibacterial particles are porous and substantially spherical with a particle size of 200 μm or less, and have a specific surface area of 10 m ² / g or more, Although not limited thereto, in addition to the above-mentioned spray drying granulation method, a granulation method of freeze-drying and then pulverization, or a high-speed stirring granulation method may be used. Further, as the granulation method, a granulator such as a pelletizer, Marumerizer (manufactured by Fuji Paudal Co., Ltd.), CF Granurex (manufactured by Freund Sangyo Co., Ltd.) may be used.

[0041]

According to the above construction, since the foam particles made of synthetic resin can be mainly used, the weight can be reduced. Further, on the surface of the foam particles, since the modifier and the antibacterial agent are fixed by an adhesive, it is possible to have voids between the foam particles, thereby having air permeability and water permeability, and It has fertilizing and water-retaining properties by each modifier, and supports the roots of plants by suppressing the fluidity of each foam particle due to the unevenness of each modifier fixed on the surface of the foam particle. Can have supportive nature.

From the above, when it is used as a soil, it is possible to plant a plant in the soil with the above-mentioned supportability, and because of the above-mentioned air permeability, water permeability, fertilizing property, and water retaining property, a good growth condition can be obtained. Can be maintained.

Moreover, even if the soil is submerged by irrigation or rain, the separation of the foam particles and the modifier is avoided by fixing with an adhesive, so that foam particles having a low density as in the conventional case can be obtained. It is prevented from floating and moving to the upper layer.

Further, in the above-mentioned constitution, since the antibacterial agent is fixed on the surface of the foamed particles, the antibacterial agent is exposed, and the antibacterial agent can efficiently contact with bacteria and mold, and The outflow of the antibacterial agent to the outside can also be avoided.

[0045]

【Example】

[Embodiment 1] The following will describe one embodiment of the present invention as Embodiment 1 with reference to FIG. In this example, the structure of the soil substitute is described by explaining a method for manufacturing the soil substitute. First, in the method for producing a soil substitute, an expanded polystyrene molded body (expansion ratio 50 times,
After applying an apparent specific gravity of 0.02) to a crusher, it is passed through a knotting plate with many round holes of 5 mm in diameter, and as shown in Fig. 1 (a), foam particles made of synthetic resin with a particle size of 5 mm under. Got 1.

5000 ml of the above-mentioned foam particles 1 are weighed,
Further, weigh 450 g of water, add to a blender, stir,
Water 2 was attached to the surface of the foam particles 1. continue,
In the above mixture, as hydrophilic inorganic particles having an antibacterial agent, amorphous calcium phosphate containing silver (amount of silver added: 0.
Antibacterial agent particles 3 composed of particles (5 mol%) were weighed in an amount of 300 g, added into the blender and stirred, and attached onto the surface of the foam particles 1 through water 2.

Subsequently, 45 g of a water-reactive urethane prepolymer (liquid temperature 20 ° C., Toho Kagaku Co., trade name Hycel-OH-1) as an adhesive agent was added to the blender and stirred to obtain a substantially uniform mixture. By dispersing, as shown in FIG. 1 (b), the urethane prepolymer reacts with water and crosslinks to become an unnecessary urethane polymer 4 in water, and the antibacterial agent particles 3
To obtain a soil substitute in which the urethane polymer 4 was adhered to the surface of the foam particles 1.

Next, a method for producing the antibacterial particles 3 will be described. Therefore, first, a method of manufacturing a slurry containing amorphous calcium phosphate (hereinafter, abbreviated as ACP) particles will be described below. , 0.5% by weight of ammonium triacrylate as a water-soluble polymer dispersant was added to obtain a mixed solution, and the pH of the mixed solution was adjusted to pH 10 by adding an aqueous phosphoric acid solution under stirring to obtain a particle size. A slurry containing ACP fine particles of about 0.1 μm or less was obtained.

AC prepared by diluting the above slurry with ion-exchanged water so that the concentration of ACP becomes 20% by weight.
A P slurry was obtained. Anhydrous silver nitrate powder dissolved in ion-exchanged water was mixed with the ACP slurry so as to be 0.1 to 10 mol%, and stirred with a stirring motor for 1 hour to obtain a mixture slurry.

The above-mentioned mixture slurry containing ACP particles and silver ions is supplied to a spray dryer (L-8 manufactured by Okawara Kako Kikai Co., Ltd.) by a metering pump. The atomizer of the spray dryer was rotated at a high speed, and the mixture slurry was sprayed into the hot air stream for drying in the spray dryer, thereby performing granulation drying by the spray granulation method.

AC containing silver ion obtained by granulation drying
The substantially spherical antibacterial particles 3 that were P fine powder were collected by a cyclone. At this time, ultrafine powder that could not be collected by the cyclone was separately collected by a bag filter.

The operating conditions in the above spray drying granulation were as follows. The feed rate of the mixture slurry as the raw material by the metering pump is 1 to 3 kg / h, and the temperature of the hot air heated by the electric heater through the air filter is 200 to 250 ° C at the hot gas chamber inlet temperature. , The outlet temperature at the discharge hole connected to the cyclone is controlled to always exceed 100 ° C, and the atomizer speed is 1
It was set within the range of 0000-37,000 rpm.

Example 2 A soil substitute was obtained in the same manner as in Example 1 except that the amount of the antibacterial agent particles 3 used was changed from 300 g to 100 g.

[Example 3] First, in the method for producing a soil substitute, a foamed polystyrene molded body (foaming ratio 50 times, apparent specific gravity 0.02) was crushed and then many round holes with a diameter of 5 mm were drilled. After passing through the joint plate, as shown in FIG. 2A, foam particles 1 made of a synthetic resin having a particle diameter of 5 mm under were obtained.

5000 ml of the above-mentioned foam particles 1 are weighed,
Further weigh 500 g of water, add to a blender, stir,
Water 2 was attached to the surface of the foam particles 1.

Next, in the above mixture, diatomaceous earth fine powder (produced by Crimine Industry Co., Ltd., trade name:
Kunilite 401) 250 g, zeolite fine powder (manufactured by Nitto Koka Shoji Co., Ltd., trade name: ZO # 70) 250 g, 100 g of the antibacterial agent particles 3 described in Example 1 were weighed and added to the blender, and stirred to foam. It was made to adhere to the surface of the body particle 1 via water 2.

Thereafter, 350 ml of charcoal ash (trade name: wood carbon pinos, manufactured by Matsui Industry Co., Ltd.) as an animal and plant organic soil improving material 6 and 600 ml of pearlite perlite as the hydrophilic inorganic foam particles 7 are added as described above. It was added to the blender and stirred.

Subsequently, 60 g of the urethane prepolymer described in Example 1 as an adhesive was placed in the blender.
When added and stirred to disperse the particles substantially uniformly, the urethane prepolymer reacts with water and crosslinks.
As shown in (b), the urethane polymer 4 becomes insoluble in water. Thereby, the inorganic particles 5, the antibacterial agent particles 3,
A soil substitute was obtained in which the organic soil conditioner 6 and the inorganic foam particles 7 were adhered to the surface of the foam particles 1 through the urethane polymer 4.

Next, the antibacterial properties of the soil substitute of Example 3 were examined. First, a shaku banana seedling was potted using the soil substitute obtained in Example 3, and a 3 shaku banana seedling was potted using a similar soil substitute containing no antibacterial agent as a comparative example. I made things.

To each of the above potted plants, sufficient fertilizer (manufactured by Aminol Chemical Laboratory, trade name: Fertilizer 5551 for amino acid strawberry) and water were added, and they were kept in a thermostatic chamber at 25 ° C. and 50% relative humidity for 1 week. The sample was left to stand and the result was observed. The results show that white cotton-like mold was generated on the fertilizer on the third day in the potted plant of the comparative example, whereas no change was observed in the potted plant using the soil substitute of Example 3 above. There wasn't.

As described above, according to the structure of each embodiment, when used as the soil, the foam particles 1 made of the synthetic resin can be mainly used, so that the weight of the soil can be reduced. Since the hydrophilic inorganic particles as the modifier and the antibacterial particles 3 as the antibacterial agent are fixed to the surface of the foam particles 1 by the adhesive, the foam particles 1 ...
There can be voids between them, and the soil is breathable,
It has water permeability, and its antibacterial particles 3 make it a fertilizer.
It may have a water retention property and, in addition, have supportability for supporting the roots of plants by suppressing the fluidity of each foam particle 1 due to the unevenness of each antibacterial particle 3 fixed on the surface of the foam particle 1. it can.

From the above, when the above-mentioned constitution is used for the soil, it is possible to plant the plant in the soil without falling due to the above-mentioned support, and the above-mentioned air permeability, water permeability,
Due to the fertilizing property and the water retaining property, it is possible to maintain a good growth state of the plant.

Moreover, even if the soil is submerged by irrigation or rain, the separation of the foam particles 1 and the antibacterial particles 3 is avoided by fixing with an adhesive, so that the foam having a low density as in the conventional case is used. The particles 1 are prevented from floating or moving to the upper layer.

As a result, it is possible to avoid the outflow and scattering of the foam particles 1 which have been likely to occur conventionally, so that it is possible to prevent the bearing property from being deteriorated due to the reduction of soil due to the outflow and scattering.

Further, in the above-mentioned constitution, since the antibacterial agent is fixed on the surface of the foam particles 1, the antibacterial agent is exposed, and the antibacterial agent can efficiently contact with bacteria and mold, In addition, it is possible to prevent the antibacterial agent from flowing out.

Therefore, for example, it is possible to prevent the appearance from being deteriorated and the occurrence of a disease due to the generation of white cotton-like mold, and in addition, to the outside of the antibacterial agent fixed on the surface of the foam particle 1. Spills can be avoided, and the pollution and river damage of rivers and tap water due to the above antibacterial agents can be suppressed.

As a result, the above-mentioned constitution can be suitably used as a soil substitute, and in particular, it can be suitably used as a soil substitute on a roof such as a building having a placing load limit or on an artificial ground such as a veranda.

In the constitution of each of the above-mentioned examples, the antibacterial particles 3 used were particles of amorphous calcium phosphate carrying silver as an antibacterial agent, but the invention is not limited to the above. For example, particles of amorphous calcium phosphate, which is a hydrophilic inorganic particle, and a compound containing silver ions are mixed with the foam particles 1, water and the organic soil conditioner 6, the inorganic foam particles 7, etc., and then subjected to a water reaction. -Containing urethane prepolymer is further mixed, and while adsorbing silver ions on the amorphous calcium phosphate particles, amorphous calcium phosphate particles carrying silver ions on the surface of the foam particles 1,
The organic soil conditioner 6 and the inorganic foam particles 7 may be adhered and fixed.

[0069]

The soil substitute of the present invention, as described above,
On the surface of the synthetic resin foam particles, hydrophilic inorganic particles, at least one modifier selected from the group consisting of hydrophilic inorganic foam particles and animal and plant organic soil improver and an antibacterial agent, Is fixed by an adhesive.

Therefore, when the above-mentioned structure is used as the soil, the separation of the foam particles and the modifying material is avoided by fixing with the adhesive, so that the density of the conventional structure can be maintained by flooding by irrigation or rain. The transfer of small foam particles to the upper layer of the soil is prevented. Therefore, the outflow of the foam particles due to flooding and the scattering of the foam particles due to the wind can be prevented, so that the reduction of the soil can be suppressed, so that the deterioration of the supportability due to the reduction of the soil can be reduced.

Further, in the above-mentioned constitution, since the antibacterial agent is fixed on the surface of the foamed particles, the antibacterial agent can be exposed in the soil, and the antibacterial agent can be effectively contacted with the fungus and mold. Since the antibacterial agent can suppress the growth and proliferation of mold and the like and can prevent the antibacterial agent from flowing out, it is possible to prevent tap water and rivers from being contaminated by the antibacterial agent and prevent chemical damage. .

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a process for producing a soil substitute of Examples 1 and 2 of the present invention.

FIG. 2 is a schematic cross-sectional view showing a process for producing a soil substitute according to Example 3 of the present invention.

[Explanation of symbols]

 1 Foam particles 3 Antibacterial particles (inorganic particles, antibacterial agents) 4 Urethane polymer (adhesives)

Claims (1)

[Claims] 1. At least one modification selected from the group consisting of hydrophilic inorganic particles, hydrophilic inorganic foam particles, and animal and plant-based organic soil conditioners on the surface of synthetic resin foam particles. A soil substitute characterized in that a material and an antibacterial agent are fixed by an adhesive.