JPH09183971A - Soil conditioner and artificial soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a soil conditioner which is easy to disperse and has high persistence of the effect by coating a biodegradable plastic with an antibacterial agent and/or a mildewproofing agent and obtain an artificial soil from the soil conditioner. SOLUTION: This soil conditioner is obtained by coating a biodegradable plastic with an antibacterial agent and/or a mildewproofing agent. The biodegradable plastic preferably has a grain diameter of 0.5-30mm. It is suitable to use, e.g. an injection molding or extrusion technique to form grains of the biodegradable plastic. For example, the granular biodegradable plastic is coated with a dispersion of an antibacterial agent, etc., in a solvent. An artificial soil is formed from the soil conditioner alone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil modifying agent and artificial soil, which can be used as a soil improving agent for horticultural and agricultural purposes and as an underfloor soil for buildings such as houses. Regarding soil.

[0002]

2. Description of the Related Art In agriculture, horticulture, etc., there has been a problem that the root rot causes the plant to die at the stage of growing the plant. Root rot is a problem that tends to occur when there is no drainage in hot and humid climate conditions like Japan and there is no air circulation in the soil, and bacteria in the soil, especially anaerobic bacteria,
The growth of plant roots is inhibited by the influence of microorganisms such as molds.

Conventionally, organic and inorganic chemicals have been used as root rot preventives. In the case of organic substances, they were supplied mainly as liquids, and in the case of inorganic substances, they were supplied mainly as fine particle powders. These were used alone, and were dispersed and added to the soil at the time of use.

[0004]

However, it is difficult to disperse and add a liquid chemical to soil because it is a liquid. Moreover, the chemicals start to flow out due to rain or flooding, and there is a problem in the sustainability of the medicinal effect. Even when a powdered chemical is dispersed and added to the soil, there is a problem that the powder is biased or flows out due to rain or submergence. Further, since the fine particles have a small ability to retain the drug effect, there is a problem that the drug effect decreases in a short period of time.

Therefore, an object of the present invention is to solve the above-mentioned drawbacks and provide a soil modifier and an artificial soil which are easy to disperse and have a long-lasting effect.

[0006]

[Means for Solving the Problems] In order to achieve the above objects, the soil modifying agent and the artificial soil of the present invention are constructed as follows.

That is, the soil modifying agent of the present invention is constructed such that the surface of the biodegradable plastic is coated with an antibacterial agent.

Further, the surface of the biodegradable plastic is coated with an antifungal agent.

Further, the surface of the biodegradable plastic is coated with an antibacterial agent and an antifungal agent.

In the above invention, the particle size of the biodegradable plastic may be 0.5 to 30 mm.

Further, the artificial soil of the present invention is constituted so as to consist only of the above-mentioned soil modifying agent.

[0012]

Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the soil modifying agent of the present invention. In the figure, 1 is a biodegradable plastic, and 2 is an antibacterial agent or antifungal agent.

The soil modifier is obtained by coating the surface of biodegradable plastic 1 with either antibacterial agent 2 or antifungal agent 2 or both antibacterial agent 2 and antifungal agent 2 (FIG. 1). reference).

The biodegradable plastic 1 is a high molecular substance whose whole or part is decomposed into low molecular compounds such as carbon dioxide, water and methane by the action of microorganisms such as bacteria, fungi and algae in soil or water. Alternatively, it includes a compound. The biodegradable plastic 1 includes the following.

(1) Chemically synthesized aliphatic polyester resin (polyester olefin resin, polyesteramide resin, polyester ether resin, etc.) (2) Natural polymer polyvinyl alcohol resin (starch modified polyvinyl alcohol copolymer resin, Ethylene polyvinyl alcohol copolymer resin, etc.) (3) Natural polymer starch polycaprolactone resin (4) Natural polymer cellulose resin (5) Chemically synthesized polylactic acid resin (6) Microorganism-produced polyester resin (polyhydroxyalkano) Aate resin, etc.)

If necessary, an additive such as a coloring agent for coloring the biodegradable plastic 1 may be added.

Further, a polymer alloy of the above-mentioned respective materials, or a biodegradable plastic 1 obtained by mixing polyethylene with a biodegradation attractant such as starch or vegetable oil may be used.

The antibacterial agent 2 may be either inorganic or organic. Among them, those which do not inhibit the decomposition of the biodegradable plastic 1 are preferable. Specifically, silver glass type, silver zeolite type, silver calcium phosphate (apatite) type, silver magnesium aluminosilicate type, zirconium phosphate type, silica gel type, calcium silicate type,
Inorganic silver type antibacterial agents such as aluminum phosphate type, aluminum titanium phosphate (crystallized glass) type, potassium titanate type, hinokitiol, wasabi extract, chitosan, Moso bamboo extract, organic silicon quaternary ammonium salt, quaternary Ammonium salt-based, organic halogen-based, phenol-based, benzimidazole-based, thiazoline-based, organic mercury-based, organic tin-based and other organic antibacterial agents, I ₂ , Cl ₂ , KMnO ₄ and other inorganic oxidant-based antibacterial agents, Hg ^{It is} preferable to use a heavy metal salt such as ²⁺ , Ag ⁺ , Cu2 ⁺ .

The antifungal agent 2 may be either inorganic or organic. Among them, those which do not inhibit the decomposition of the biodegradable plastic 1 are preferable.

The granulation of the biodegradable plastic 1 may be carried out by a method such as an injection molding method or an extrusion molding method. Usually, extrusion molding is used. That is, the resin is continuously extruded from the die, and after the cooling step, it is cut into pellets with a certain length.

The surface of the biodegradable plastic 1 is coated with either or both of the antibacterial agent and the antifungal agent 2. As the coating method, a lacquer in which a solvent or biodegradable plastic 1 is dissolved in a solvent, or an antibacterial agent 2 in a solution in which the biodegradable plastic 1 is emulsified
There is a method of coating the granular biodegradable plastic 1 with a dispersion of the above. Further, there is a method in which granular biodegradable plastic 1 is put into the above liquid, pulled up, and then dried. In addition, there is a method in which a resin extruded from a die is continuously added to the above solution, cooled by this, and then cut into pellets into a certain length.

The particle size is preferably 0.5 to 30 mm. If the particle size is less than 0.5 mm, there is a problem that the antibacterial agent 2 in the form of fine powder is run off from the soil due to rain or submergence as in the case of handling it alone. If the particle size exceeds 30 mm, biodegradable plastic is difficult to decompose in soil,
In addition, there is a problem that the roots of plants are difficult to grow and hinder their growth.

The soil modifier can be obtained as described above.

The artificial soil of the present invention comprises only the above-mentioned soil modifier. In other words, it is composed of the biodegradable plastic 1, the antibacterial agent 2 and / or the antifungal agent 2 within a range that does not inhibit the medicinal effect of the antibacterial agent 2 and the antifungal agent 2 and the decomposition of the biodegradable plastic 1. By adding an additive such as a coloring agent, artificial soil of any color is obtained. It is suitable for hydroponics in a glass container.

[0026]

Example: Lactic acid-based biodegradable plastic (Lacty manufactured by Shimadzu Corporation) was continuously extruded at 200 ° C using an extrusion molding machine having a die with a diameter of 5 mm, and the solvent (M
EK) was continuously charged into a liquid in which an antibacterial agent (antibacterial high-cera coat manufactured by Shinto Recerax Co., Ltd.) was dispersed, and what was cooled was cut into a length of 5 mm with a guillotine blade. In this way, the surface of the lacty was partially softened by the solvent, and a soil modifier having a particle size of 5 mm coated with an antibacterial agent was obtained.

[0027] Using 200g of this mixed with 20kg of horticultural soil, dahlia bulbs were planted, and the temperature was around 20 ° C.
When left at a humidity of 90%, root rot occurred in the soil without the soil modifier, but the mixture grew quickly. After the growth of dahlia stopped and the bulbs were discarded, the soil was left alone and no biodegradable plastic residue was found after one year.

[0028]

Since the present invention has the above-described structure, it has the following effects.

The soil modifying agent of the present invention is a pellet or granular soil modifying agent to which either or both of an antibacterial agent and an antifungal agent are added. , Helps to prevent root rot by killing microorganisms such as molds. When the surface has no antibacterial property, the biodegradable plastic is used and bacteria in the soil grow and decompose the degradable plastic. This returns naturally and does not interfere with the natural cycle.

Further, since it is granular, it is easy to handle, and since it is coated with biodegradable plastic, the antibacterial effect is durable.

The artificial soil of the present invention can prevent diseases such as root rot without adding any chemicals.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a soil modifying agent of the present invention. 1 Biodegradable plastic 2 Antibacterial or antifungal agent

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Claims (5)

[Claims] 1. A soil modifier comprising a biodegradable plastic coated on its surface with an antibacterial agent. 2. A soil modifying agent characterized by coating a surface of biodegradable plastic with an antifungal agent. 3. A soil modifier comprising a biodegradable plastic coated on its surface with an antibacterial agent and an antifungal agent. 4. The particle size of biodegradable plastic is 0.5 to 30 m.
The soil modifier according to any one of claims 1 to 3, which is m. 5. An artificial soil comprising only the soil modifying agent according to any one of claims 1 to 4.