JP6948701B2 - Soil agglomerate - Google Patents

Description

The present invention relates to a soil agglomerating agent.

It is known that clay, sand, and humus derived from organic matter aggregate to form aggregates having a larger particle size than clay and sand. The soil composed of aggregates has appropriate voids, has excellent drainage and water retention, and is soft. Aggregated soil has such characteristics and is therefore the most suitable soil for cultivating crops.

It is said that soil agglomeration progresses due to the action of organisms such as microorganisms and earthworms, but a technique of artificially agglomerating soil by spraying a soil agglomerating agent on a field is known.

For example, Patent Document 1 describes a soil made of a condensate of an acrylamide-based copolymer with polyacrylamide or another copolymerizable component thereof and a hydroxymethyl compound of an aromatic compound having a cation exchange ability. The improver is listed. It is also described that polymers such as acrylamide, acrylic acid and salts thereof, and partial saponified products of poval and vinyl acetate have been developed as soil conditioners.

Tokukousho 41-334 Gazette

The soil agglomerating agent of Patent Document 1 contains polyacrylamide or an acrylamide-based copolymer with other copolymerizing components capable of copolymerizing with the polyacrylamide. In such a soil agglomerating agent, fine particles are joined together to agglomerate the soil.

Most of the conventional soil agglomerating agents are liquid and are used after being diluted with water. When using it, it is said that the soil agglomerating agent must be used alone. This is because when the soil agglomerating agent and other acidic components such as fertilizer and soil activator are mixed, the solid content precipitates and becomes cloudy, or the solid content precipitates and becomes unusable. However, to use the soil Orchestra grain agent alone is poor in work efficiency. For example, in bad weather, it is preferable to spray the soil agglomerating agent and fertilizer at the same time because the work can be completed quickly. It is unclear why the solid content is precipitated when other acidic components are added to the conventional soil agglomerating agent. However, when the pH of the conventional soil agglomerating agent is neutral to alkaline, it is presumed that the pH is shifted and the solid content is precipitated by the addition of the acidic component.

An object of the present invention is to provide a soil agglomerating agent in which a liquid soil agglomerating agent and an acidic component are mixed when mixed with other acidic components such as fertilizer.

A liquid soil aggregating agent containing acetic acid and a polymer component that agglomerates soil, and contains a polymer component that has an acetic acid content of 0.001% by mass or more and agglomerates soil. The above problems are solved by a liquid soil agglomerating agent having an amount of 0.05 to 48% by mass. That is, in such a soil agglomerating agent, precipitation of solid content is prevented when other acidic components are blended.

The above soil agglomerating agent preferably further contains 0.1% by mass or more of an organic acid other than acetic acid. The soil agglomerating agent described above preferably further contains at least one acidic fertilizing component selected from the group consisting of nitrogen, phosphorus, and potassium. The polymer component that aggregates the soil is preferably one or more polymers selected from the group consisting of polyacrylamide-based compounds, polyethyleneimine-based compounds, and polyvinyl alcohol-based compounds.

According to the present invention, it is possible to provide a soil agglomerating agent in which a liquid soil agglomerating agent and an acidic component are mixed when mixed with other acidic components such as fertilizer.

Hereinafter, preferred embodiments of the present invention will be described. The soil agglomerating agent of the present invention is a liquid soil aggregating agent containing acetic acid and a polymer component that agglomerates the soil. The soil agglomerating agent contains 0.001% by mass or more of acetic acid and 0.05 to 48% by mass of a polymer component that agglomerates the soil. The content of the polymer component is more preferably 0.05 to 25% by mass, further preferably 0.05 to 15% by mass, and particularly preferably 0.05 to 8% by mass. The content of acetic acid is more preferably 0.01% by mass or more, and more preferably 0.08% by mass or more. The upper limit of the acetic acid content is preferably 20% by mass or less, more preferably 15% by mass or less, further preferably 8% by mass or less, and preferably 3.9% by mass or less. Especially preferable.

In order to produce the above-mentioned soil agglomerating agent, it is preferable to mix acetic acid, a polymer component, other formulations, and a solvent such as water. The mixing method is not particularly limited, but acetic acid and the polymer component are weighed in a container so as to have a predetermined concentration, and if necessary, another mixture and a solvent such as water are added to the polymer component. The concentration of acetic acid may be adjusted to a predetermined level.

As acetic acid, for example, glacial acetic acid or an acetic acid solution having a lower concentration than glacial acetic acid can be used. It is preferable to mix these acetic acid solutions so that the final concentration of acetic acid is 0.001% by mass or more.

The polymer component can be used for soil agglomeration, and it is preferable to use a polymer that is soluble in an acidic aqueous solution. As for such a polymer, for example, a commercially available one can be used. When the polymer component is provided in the form of a solution or powder containing components other than the polymer component, it is preferable to convert and blend the polymer so that the final concentration of the polymer is 0.05 to 48% by mass. .. The pH of the soil agglomerating agent is preferably 1 to 6, and more preferably 1.8 to 5. The polymer component preferably exhibits solubility in an aqueous solution having such a pH.

As the polymer component for aggregating the soil, it is preferable to use one or more polymers selected from the group consisting of polyacrylamide-based compounds, polyethyleneimine-based compounds, and polyvinyl alcohol-based compounds.

Examples of polyacrylamide compounds include nonionic polyacrylamide and copolymers of acrylamide and other monomers. Other monomers include acrylic acid, methacrylic acid, acrylonitrile, metaacrylamide, maleic anhydride and the like.

Examples of the polyethyleneimine-based compound include polyethyleneimine, a copolymer of ethyleneimine and another monomer, and the like. Examples of the polyvinyl alcohol-based compound include polyvinyl alcohol, a saponified copolymer of a vinyl acetate monomer and another monomer, and a cationically modified product thereof.

The soil agglomerating agent preferably contains 0.1% by mass or more of an organic acid other than acetic acid, and preferably 1% by mass or more. The content of the other organic acid is preferably 40% by mass or less, more preferably 28% by mass or less, and particularly preferably 22% by mass or less. When the other organic acid contains another component such as water, it is preferable to convert and mix the other organic acid so that the final concentration of the other organic acid becomes as described above. The other organic acid may be soluble in a liquid soil agglomerating agent, and is preferably at least one organic acid selected from the group consisting of, for example, citric acid and oxalic acid.

In the above soil agglomerating agent, when other acidic components such as fertilizer and soil activator are added, the other acidic components and the liquid soil aggregating agent are mixed. Therefore, for example, at the site where the soil agglomerating agent is sprayed, it is possible to mix an acidic component such as a fertilizing component or a soil activator with the liquid soil agglomerating agent and spray both at once. It will be possible. In addition, since the liquid soil agglomerating agent and other acidic components such as fertilizer are mixed, it is possible to sell a premixed product in which other acidic components such as fertilizer are mixed in advance with the soil agglomerating agent. Is.

The soil agglomerating agent preferably contains at least one fertilizing component selected from the group consisting of nitrogen, phosphorus, and potassium. As a result, the soil agglomerating agent and the fertilizing component can be sprayed to the field or the like at once, and the workability is improved. Since these fertilizing components are often provided as chemically acidic fertilizers (compounds) such as monoan phosphate, dian perphosphate, lime superphosphate, and phosphate solution, they are liquid soil groups. When mixed with a granulating agent, it was a factor in inducing the precipitation of solid content. The content of the above compound containing the fertilizing component is preferably, for example, 5 to 40% by mass.

Hereinafter, a more specific description will be given with reference to examples.

[Examples 1 to 10, and Comparative Example 1 and Comparative Example 2]
Glacial acetic acid (purity 99%) 0.1% by mass, polyacrylamide powder (resin content 99% mass% or more, molecular weight 12 million), urea (purity 99% or more) as nitrogen-based components, and phosphoric acid-based components A phosphoric acid solution (purity of 85% or more), potassium chloride (purity of 99% or more) as a potassium-based component, and water occupying the balance were mixed to obtain a liquid soil agglomerating agent according to Example 1. .. The content of the raw material was changed as described in Tables 1 and 2, and similarly, the soil agglomerating agents according to Examples 2 to 10 and Comparative Examples 1 and 2 were obtained. Similar to Example 1, in Examples 2 to 10 and Comparative Examples 1 and 2, the balance other than the raw materials shown in Table 1 is water (in each of the Examples and Comparative Examples described below). same).

[Examples 11 to 15]
Except that in addition to glacial acetic acid (purity 99%), crystalline anhydrous citric acid (purity 99.5% or more) was blended as another organic acid, and the content of each raw material was changed as shown in Table 3. The liquid soil agglomerating agent according to Examples 11 to 15 was obtained in the same manner as in Example 1.

[Examples 16 to 19, and Comparative Examples 3 and 4]
In addition to glacial acetic acid (purity 99%), crystalline oxalic acid (purity 99.6% or more) was blended as another organic acid, and the content of each raw material was changed as shown in Table 4. The liquid soil agglomerating agent according to Examples 16 to 19 was obtained in the same manner as in Toshi 1.

In place of glacial acetic acid (purity 99%), crystalline oxalic acid (purity 99.6% or more) and citric acid (purity 99.5% or more) are blended as other organic acids, and each raw material is further contained. The liquid soil agglomerating agent according to Comparative Example 3 and Comparative Example 4 was obtained in the same manner as in Example 1 except that the amount was changed as shown in Table 4.

[Example 20 to Example 22]
As shown in Table 5, the soil agglomerating agent according to Examples 20 to 22 was obtained in the same manner as in Example 1 except that the content of each raw material was changed.

[Examples 23 to 26]
Instead of polyacrylamide, a liquid of polyethyleneimine (resin content of 98% by mass or more, average degree of polymerization of 600) or a powder of polyvinyl alcohol (resin content of 98% by mass or more, average degree of polymerization of 1400, saponification degree of 99.0 mL%) is used. The liquid soil agglomerating agent according to Examples 23 to 26 was obtained in the same manner as in Example 1 except that the contents of each raw material were changed as shown in Table 6.

Each of the above Examples and Comparative Examples was examined by the following methods for each item of mixing property, separation at high temperature, crystallization at low temperature, and mold generation.

[Mixability]
The raw materials of each Example and each Comparative Example were mixed and stirred using a magnetic stirrer and a stirrer. The time required for the solid content contained in the liquid soil agglomerating agent to dissolve and become colorless and transparent was measured. The results are shown in Tables 1 to 6 as an 8-grade evaluation as shown below.
A: Within 10 minutes B: Within 20 minutes C: Within 30 minutes D: Within 40 minutes E: Within 50 minutes F: Within 60 minutes G: Within 60 minutes H: Cannot be mixed

[Separation at high temperature]
The sample after mixing in the above mixing test was stored at a high temperature (50 ° C.), and the time until deterioration over time, that is, separation of the liquid occurred was measured. The results are shown in Tables 1 to 6 as a three-stage evaluation as shown below.
〇: 1440 hours or more ×: less than 168 hours Δ: Separation occurred from 168 hours or more to less than 1440 hours

[Crystallization at low temperature]
The sample after mixing in the above mixing test was stored at a low temperature, and the deterioration over time, that is, the time until crystals were precipitated in the liquid was measured. The results are shown in Tables 1 to 6 as a three-stage evaluation as shown below.
〇: 2000 hours or more ×: Violently crystallized in less than 100 hours Δ: Slight crystals precipitated in 100 hours or more and less than 2000 hours

[Mold outbreak]
The sample after mixing in the above mixing test was stored at room temperature, and the time until deterioration over time, that is, mold formation was measured. The results are shown in Tables 1 to 6 as a three-stage evaluation as shown below.
〇: 720 hours or more ×: less than 168 hours Δ: Mold occurred from 168 hours or more to less than 720 hours

As is clear from Tables 1 to 6, in the formulation according to Examples 1 to 26, even if an acidic fertilizer is blended, each raw material is mixed without any problem such as solid matter remaining without being dissolved. It was possible to obtain a liquid soil agglomerating agent. On the other hand, in the formulations according to Comparative Example 1 and Comparative Example 2, the polymer component remained as a solid content and could not be dissolved. Therefore, in the formulations according to Comparative Example 1 and Comparative Example 2, the generation of mold, the separation at high temperature, and the crystallization at low temperature were not evaluated. In the formulations according to Comparative Example 1 and Comparative Example 2, solid content remained, which could clog the sprayer, and it could not be expected that the polymer component was uniformly sprayed on the field.

In the formulations according to Examples 5 and 6, which contained a relatively large amount of acetic acid, crystallization occurred when exposed to a low temperature. However, it was possible to mix the soil agglomerating agent and the acidic fertilizing component at the site and quickly spray and use up.

In Comparative Example 3 and Comparative Example 4 in which acetic acid was not added, mold was generated in a short time. In Comparative Example 3 and Comparative Example 4, the storage container was contaminated by mold. Since the sprayer became moldy, spraying on the field had to be stopped. On the other hand, no mold was observed in the formulations according to Examples 1 to 26 in which acetic acid was blended. From the above results, it was found that acetic acid has an antifungal effect.

In the formulation according to Examples 11 to 19, the miscibility between the liquid soil agglomerating agent and the fertilizer could be improved by blending an organic acid other than acetic acid. By adding other organic acids, crystallization was not particularly remarkable at low temperature.

As is clear from Table 1, it was confirmed that as the amount of acetic acid blended increased, the time during which crystallization occurred tended to shorten when exposed to low temperatures. On the other hand, as is clear from Tables 3 and 4, with respect to other organic acids such as citric acid and oxalic acid, there was no tendency for the crystallization time to be shortened even if the blending amount was increased.

As is clear from Table 1, it was confirmed that the mixing property was improved as the amount of acetic acid blended increased. Similarly, it was confirmed that the mixing property was improved when the amount of organic acids other than citric acid was increased. Further, as for the mixing property, as is clear from Table 2, it was also confirmed that the mixing property was improved as the blending amount of the polymer component was reduced.

Apart from the verification by the above Examples and Comparative Examples, the ease of separation at high temperature was also examined for a compounding example in which 0.1% by mass of sulfuric acid was blended as an inorganic acid instead of the acetic acid of Example 1. It was confirmed that the mixed solution of the soil agglomerating agent and the acidic component was separated in a shorter time when the compound containing the inorganic acid was blended.

As described above, in the formulation according to Examples 1 to 26, it was possible to dissolve the acidic fertilizer in the liquid soil agglomerating agent. Therefore, it is possible to bring the soil agglomerating agent and fertilizer to the site, mix them at the site, and spray them on the field in one operation. Further, it is possible to sell a soil agglomerating agent in which a soil agglomerating agent and a fertilizer are mixed in advance as a premix product. In this case, the user only needs to spray the soil agglomerating agent mixed with the acidic fertilizing component in advance, which greatly improves the convenience in carrying out the work.

In the formulations according to Examples 1 to 26, mold does not occur even after a long period of time. Since mold does not occur for a long period of time and the quality is stable, it is possible to sell it as a premixed product in which a soil agglomerating agent and a fertilizer are mixed in advance with the soil agglomerating agent. Even when the soil agglomerating agent and fertilizer are mixed in the field, mix the soil agglomerating agent and fertilizer, store the surplus, and use it for the next spraying. Becomes possible.

Claims (3)

A liquid soil aggregating agent containing acetic acid, a polymer component that agglomerates soil, and an organic acid other than acetic acid.
The polymer component is soluble in acidic solutions and
The content of acetic acid is 0.001% by mass or more,
The content of the polymer component that agglomerates the soil is 0.05 to 48% by mass.
The organic acids other than acetic acid are at least one organic acid selected from the group consisting of citric acid and oxalic acid.
The content of organic acids other than acetic acid is 0.1% by mass or more, and
A liquid soil agglomerating agent whose balance is water, excluding acetic acid, polymer components and other organic acids other than acetic acid. A liquid soil aggregating agent containing acetic acid, a polymer component that aggregates soil, an organic acid other than acetic acid, and a fertilizing component.
The polymer component is soluble in acidic solutions and
The content of acetic acid is 0.001% by mass or more,
The content of the polymer component that agglomerates the soil is 0.05 to 48% by mass.
The organic acids other than acetic acid are at least one organic acid selected from the group consisting of citric acid and oxalic acid.
The content of organic acids other than acetic acid is 0.1% by mass or more, and
The fertilizing component is at least one acidic fertilizing component selected from the group consisting of nitrogen, phosphorus, and potassium.
A liquid soil agglomerating agent whose balance is water, excluding acetic acid, polymer components , organic acids other than acetic acid, and fertilizing components. The soil agglomeration according to claim 1 or 2 , wherein the polymer component that agglomerates the soil is one or more polymers selected from the group consisting of polyacrylamide-based compounds, polyethyleneimine-based compounds, and polyvinyl alcohol-based compounds. Agent.