TW202225222A - Soil erosion inhibitor - Google Patents

Abstract

Provided is a soil erosion inhibitor in which the cleaning performance of a formed film is excellent. The present invention provides a soil erosion inhibitor which includes a resin emulsion and 1.0-10.0 mass% of a polyhydric alcohol relative to 100 mass% of the resin component of the resin emulsion, wherein the carbon number of the polyhydric alcohol is 2-10.

Description

Soil erosion control agent

The present invention relates to soil erosion control agents.

There is a problem with agricultural land that the surface soil is eroded by wind or rainfall. Patent Document 1 describes a soil erosion inhibitor containing a resin emulsion. [Prior Art Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 2019-052289

[The problem to be solved by the invention]

However, the conventional soil erosion inhibitor has a problem in that the soil erosion inhibitor adheres to the dispersing device to form a coating film at the time of spraying, and a lot of labor is required to wash off the coating film. In addition, the environmental burden is large, and it is difficult to use the cleaning agent in the ready-made dispersion.

The present invention has been made in view of such a problem, and provides a soil erosion inhibitor excellent in the cleaning properties of the formed coating film. [Technical means to solve the problem]

According to the present invention, a soil erosion inhibitor is provided, which contains a resin emulsion and a polyol, and relative to 100 parts by mass of the resin component of the resin emulsion, the polyol is 1.0-10.0 parts by mass, and the carbon number of the polyol is 2-10.

The inventors of the present invention have completed the present invention as a result of intensive research and found that the cleaning property can be excellent by adding a certain amount of polyol to the soil erosion inhibitor.

Various embodiments of the present invention are exemplified below. The embodiments shown below can be combined with each other. Preferably, the molecular weight of the polyol is 50-150. Preferred polyols are glycerol or ethylene glycol. Preferably, the resin emulsion contains a copolymer having vinyl acetate monomer units.

Embodiments of the present invention will be described below. Various characteristic matters shown in the embodiments shown below can be combined with each other. In addition, each characteristic matter can constitute an invention independently.

The soil erosion inhibitor according to one embodiment of the present invention contains a resin emulsion and a polyol, the polyol is 1.0 to 10.0 parts by mass relative to 100 parts by mass of the resin component of the resin emulsion, and the polyol has 2 to 10 carbon atoms. .

[resin emulsion] The resin emulsion is an emulsion containing a resin, preferably an aqueous resin emulsion.

＜Water-based resin emulsion＞ The type of the aqueous resin emulsion is not particularly limited as long as water is used as the dispersion medium and resin is used as the dispersoid. As the main monomer, an aqueous resin emulsion prepared by using various olefin-based compounds such as vinyl acetate, acrylate, styrene, ethylene, and butadiene alone or by polymerizing a plurality of these compounds can be used. Specifically, vinyl acetate resin emulsions, vinyl acetate copolymer emulsions, acrylate resin emulsions, styrene acrylate copolymer emulsions, ethylene-vinyl acetate copolymer emulsions (EVA emulsions), and styrene-butanediol can be exemplified. Ethylene copolymer emulsion, vinylidene resin emulsion, polybutene resin emulsion, acrylic nitrile-butadiene resin emulsion, methacrylate-butadiene resin emulsion, asphalt emulsion, epoxy resin emulsion, polyurethane resin emulsion, silicone Resin emulsions, etc. Among them, emulsions of resins (copolymers having vinyl acetate monomer units) containing vinyl acetate-derived structural units (vinyl acetate resin emulsions, vinyl acetate copolymer emulsions, ethylene-vinyl acetate) are preferred copolymer emulsion, etc.), more preferably ethylene-vinyl acetate copolymer emulsion.

The production method of the aqueous resin emulsion is not particularly limited, but it can be produced by, for example, adding an emulsifier and a monomer to a dispersion medium containing water as a main component, and performing emulsion polymerization of the monomer while stirring. As an emulsifier, an ionic (cationic/anionic/amphoteric) surfactant and a nonionic (Nonionic) surfactant are mentioned. Examples of the nonionic surfactant include low-molecular-weight surfactants such as alkyl glycosides, and polymer-based surfactants such as polyvinyl alcohol, and polymer-based surfactants are preferred. The average degree of polymerization of polyvinyl alcohol is, for example, 200 to 2500, preferably 400 to 2200, and more preferably 500 to 2000. The larger the average degree of polymerization of polyvinyl alcohol, the higher the emulsifying and dispersing power. Therefore, in order to obtain an emulsion with a desired degree of dispersion, polyvinyl alcohol having an appropriate average degree of polymerization may be used. In addition, the polyvinyl alcohol may be used in combination of a plurality of polyvinyl alcohols having different average degrees of polymerization. The degree of saponification of polyvinyl alcohol is not particularly limited, but is, for example, 70% or more, preferably 80 to 95%. If the saponification is too low, the solubility in water is rapidly lowered, and the solution cannot be dissolved unless a special dissolution method is used, and industrial use is difficult. The lower the degree of saponification of polyvinyl alcohol, the higher the emulsification and dispersing power. Therefore, in order to obtain an emulsion with a desired degree of dispersion, polyvinyl alcohol having an appropriate degree of saponification may be used. Emulsifiers A variety of different emulsifiers can also be used in combination. The addition amount of the emulsifier is not particularly limited, but is, for example, 0.5 to 20 parts by mass, preferably 1 to 10 parts by mass, with respect to 100 parts by mass of the dispersion medium. The more the emulsifier is added, the higher the emulsification and dispersing power is, so the added amount of the emulsifier can be adjusted appropriately to obtain an emulsion with a desired degree of dispersion.

[Polyol] The soil erosion inhibitor contains 1.0 to 10.0 parts by mass of polyol, preferably 2 to 8 parts by mass, with respect to 100 parts by mass of the resin component of the resin emulsion. Within this range, a soil erosion inhibitor with good cleaning properties can be obtained. Specifically, the polyol content relative to 100 parts by mass of the resin component of the resin emulsion is, for example, 1.0, 1.5, 1.8, 2.0, 2.5, 2.7, 3.0, 3.5, 3.6, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0 , 7.5, 8.0, 8.5, 9.0, 9.1, 9.5, 10.0 parts by mass, and may be within a range between any two numerical values exemplified here. In addition, the resin component of the resin emulsion refers to the resin contained in the resin emulsion.

The number of carbon atoms of the polyol is 2 to 10, preferably 2 to 3. Moreover, 50-180 are preferable and, as for the molecular weight of a polyhydric alcohol, 60-100 are more preferable.

As a polyhydric alcohol, glycerol, ethylene glycol, propylene glycol, etc. are mentioned specifically, for example. From the viewpoint of cleaning properties, the polyhydric alcohol is preferably glycerin or ethylene glycol, and particularly preferably glycerin.

When glycerin is used as the polyol, the glycerin content is preferably 1.0 to 6.0 parts by mass relative to 100 parts by mass of the resin component of the resin emulsion, from the viewpoint of both film strength (erosion resistance) and the like and cleaning properties. In addition, when ethylene glycol is used as the polyol, the ethylene glycol content is preferably 2.0 to 6.0 parts by mass with respect to 100 parts by mass of the resin component of the resin emulsion, from the viewpoint of both the film strength (erosion resistance) and the like and cleaning properties. .

The polyol may be added during the production of the aqueous resin emulsion, or may be added after the production of the aqueous resin emulsion. In addition, the polyol may be added when the soil erosion inhibitor is applied to the soil. For example, the polyol may be added during dilution with water prior to dispersion.

[spread method] There is no particular limitation on the method of spreading the soil erosion inhibitor. For example, when spreading on a small area, a watering can or a power spreader can be used, and when spreading on a large area, a hydraulic seeder or a boom sprayer can be used. In addition, the dispersed soil erosion inhibitor can form a consolidated layer composed of the powder and granular body of the powdery particulate deposit and the soil erosion inhibitor on the powdery granular deposit, and can retain rainwater flowing into the consolidated layer and reduce the amount of inflow. The amount of water in the powder and granular deposits under the consolidation layer can effectively prevent the powder and granular deposits from collapsing and flowing out. In addition, by forming the consolidation layer, the effect of preventing dust generation can be effectively prevented.

In addition, the soil erosion inhibitor can be sprayed on the protected surface alone, or can be added to the spraying material made of soil as the main body mixed with seeds, bark compost or fertilizer, etc. and sprayed on the protected surface together with the spraying material. The method of spraying the material on the surface of the object is not particularly limited. For example, the seed spraying method, the soil spraying method, the base material spraying method, etc., or when the object surface is large, it can also be sprayed from an aircraft such as a helicopter. to spray. [Example]

The following examples are given to further illustrate the present invention in detail. In addition, these Examples are exemplifications, and do not limit the content of this invention.

1. Production example of soil erosion inhibitor As an emulsifier, 4.1 parts of polyvinyl alcohol (DENKA POVAL B-05 (degree of saponification 88 mol %, average degree of polymerization 600, manufactured by DENKA Co., Ltd.) and DENKA POVAL B-17 (degree of saponification 88 mol %, average degree of polymerization 1700, DENKA Co., Ltd.) 1.5 parts, 0.1 part of formamidine sulfinic acid as auxiliary, 0.2 part of sodium acetate, 0.005 part of ferrous sulfate heptahydrate, and 0.01 part of tetrasodium EDTA were dissolved in 100 parts of pure water, After the dissolved material was put into a high-pressure polymerization tank with a stirrer, 83 parts of vinyl acetate monomers and 20 parts of ethylene were filled with stirring, and the temperature of the inner liquid was 55° C. After that, an aqueous solution of ammonium persulfate was continuously added to carry out polymerization. When the internal pressure dropped to 4.3MPa, 26 parts of vinyl acetate monomers were added in batches over 2 hours. At the end of the polymerization, an aqueous solution of tert-butyl hydroperoxide was added, and the polymerization was continued until the amount of unreacted vinyl acetate monomers was less than 2%.Purge residual ethylene after polymerization, remove unreacted vinyl acetate monomer in the resulting emulsion under reduced pressure, and obtain a resin emulsion with unreacted vinyl acetate monomer below 0.5%. The solid content ratio of the obtained resin emulsion was measured according to JIS K 6828. The drying conditions were drying at 105°C for 3 hours. The solid content ratio was 55%.

Next, polyol was added to the resin emulsion according to the addition amount in Table 1 to prepare a polyol-containing soil erosion inhibitor. The addition amount of the polyol in Table 1 is the addition amount (parts by mass) relative to 100 parts by mass of the resin component of the resin emulsion. Glycerol: carbon number 3, molecular weight 92.1 Ethylene glycol: carbon number 2, molecular weight 62.1 Polyethylene glycol (PEG400, manufactured by Junsei Chemical Co., Ltd.): carbon number 16 to 18, molecular weight 400

2. Physical property evaluation and cleaning property evaluation <Membrane strength> The film strength was evaluated as the physical properties of the film obtained from the soil erosion inhibitor. (1) The soil erosion inhibitor adjusted to a solid content ratio of 30 mass % was cured in a template at a constant temperature and humidity chamber of 23° C. and 65% RH for 6 days to prepare a film. (2) The film was punched out using a JIS standard No. 3 dumbbell cutter to prepare a test piece for a tensile test. (3) A tensile test was carried out under an environment of 23° C. and 65% RH with the grip distance set to 7 cm and the tensile speed set to 200 mm/min. area, and the obtained value was taken as the film strength.

<Evaluation of cleaning property: friction test> The following tests were conducted to evaluate the cleaning properties. (1) A soil erosion inhibitor adjusted to a solid content ratio of 55 mass % was applied to a glass plate with a thickness of 0.1 mm, and was left to stand in a constant temperature and humidity room at 23° C. and 65% RH for 30 minutes to form a coating film. (2) Water was added dropwise to the formed coating film with a dropper, the coating film was rubbed with a fingertip, and the cleaning property was evaluated according to the following criteria. It should be noted that, in Reference Example 1, dissolution was attempted using an aqueous glycerin solution having a glycerin concentration of 1.0 wt % instead of water. ○: Most of the coating film is redispersed △: Part of the surface of the coating film is re-dispersed (the coating film remains) ×: Almost no dispersion

<Evaluation of Cleaning Properties: Dissolution Test> The following tests were performed to quantitatively evaluate cleaning properties. (1) A soil erosion inhibitor adjusted to a solid content ratio of 55 mass % was applied to a Teflon plate with a thickness of 0.2 mm, and was left to stand in a constant temperature and humidity chamber at 23° C. and 65% RH for 30 minutes to form a coating film. (2) Peel off the formed coating with tweezers, and cut out _MA (g) with scissors. (3) The cut coating film was placed in a 200 mL container containing 150 mL of water (about 23° C.) and a rotor (35 mm in length), and stirred (about 350 rpm) with a stirrer for 10 minutes. It should be noted that, in Reference Example 1, dissolution was attempted using an aqueous glycerin solution having a glycerin concentration of 1.0 wt % instead of water. (4) The water in the stirred container was filtered with a 200-mesh metal mesh, the metal mesh was dried at 105±2° C. for 1 hour, and the mass M _B (g) of the metal mesh residue was measured. (5) The coating film cleaning rate (%) was calculated by the following formula. That is, the ratio of dissolution was taken as the cleaning rate. Coating film cleaning rate (%)=100×((M _A -M _B )/M _A )

[Table 1]

As shown in Table 1, with respect to the resin component of the resin emulsion, the soil erosion inhibitor containing a certain amount of a specific polyol was found to have good cleaning properties from the results of the rubbing test. In addition, in Reference Example 1, the evaluation of cleaning property was performed using the glycerol aqueous solution containing glycerol as a polyhydric alcohol instead of water. At this time, it can be said that the cleaning solution contains polyol, but when the film itself does not contain polyol, even if a small amount of polyol is added to the cleaning solution, no significant improvement in cleaning performance is observed.

Claims (4)

A soil erosion inhibitor containing resin emulsion and polyol, The polyol is 1.0 to 10.0 parts by mass relative to 100 parts by mass of the resin component of the resin emulsion, The polyol has 2 to 10 carbon atoms. The soil erosion control agent according to claim 1, wherein, The molecular weight of the polyol is 50-180. The soil erosion control agent as claimed in claim 1 or 2, wherein, The polyol is glycerol or ethylene glycol. The soil erosion control agent as claimed in claim 1 or 2, wherein, The resin emulsion contains a copolymer having vinyl acetate monomer units.