Dust dispersion suppressant

Abstract

To provide a dust dispersion suppressant capable of suppressing dust dispersion in a more effective manner than spraying water.SOLUTION: A dust dispersion suppressant includes polyvinyl alcohol and at least one selected from hyaluronic acid and hyaluronic acid derivatives.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a dust scattering inhibitor.

Background Art

[0002] In geotechnical work having a plurality of steps such as soil excavation, temporary placement, and transportation, it is required to prevent dust scattering in each step. As a method of suppressing dust scattering, spraying a dustproof agent to solidify the soil surface has been proposed (for example, see Patent Document 1).

[0003] Also, during soil excavation, it is often done to spray water to prevent dust scattering. However, since the water content ratio of the soil increases and the soil becomes heavy, it may be troublesome to transport the excavated soil. Furthermore, in countermeasure work for soil pollution, etc., since it is necessary to treat the water that has come into contact with the soil, it may be better to avoid spraying a large amount of water in some cases. In order to reduce the amount of water used in the method of spraying tap water among waters, spraying electrolyzed water has been proposed (for example, see Patent Document 2). However, since electricity is required to produce electrolyzed water, the cost of the entire construction increases.

[0004] Furthermore, referring to the method of suppressing asbestos dust, spraying a water retention agent containing polyvinyl alcohol on the soil has also been considered. However, depending on the components of the water retention agent, the suppression of soil dust was not very effective.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention aims to provide a dust scattering inhibitor that can more effectively suppress the scattering of dust than water spraying.

Means for Solving the Problems

[0007] To achieve the above object, the present invention is a dust scattering inhibitor containing polyvinyl alcohol and at least one selected from hyaluronic acid and hyaluronic acid derivatives. Moreover, in the present invention, the content of polyvinyl alcohol is preferably 0.05% by mass to 3.0% by mass. Moreover, in the present invention, the content of at least one selected from hyaluronic acid and hyaluronic acid derivatives is preferably 0.001% by mass to 0.01% by mass. Moreover, the present invention preferably further contains a surfactant.

Effects of the Invention

[0008] According to the present invention, it is possible to provide a dust scattering inhibitor that can more effectively suppress the scattering of dust than water spraying.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0010] (Dust Scattering Inhibitor) The dust scattering inhibitor according to the embodiment contains polyvinyl alcohol and at least one selected from hyaluronic acid and hyaluronic acid derivatives, preferably further contains a surfactant, and contains other components as necessary.

[0011] <Polyvinyl Alcohol> Polyvinyl alcohol (PVA) is a type of synthetic resin and is soluble in water. Polyvinyl alcohol may be synthesized as appropriate or a commercially available product may be used. The polyvinyl alcohol used in the dust scattering inhibitor according to the embodiment is preferably one that is already dissolved in a solution and sold as a laundry starch. The content of polyvinyl alcohol is not particularly limited and can be appropriately selected according to the purpose. However, with respect to the entire dust scattering inhibitor, 0.05% by mass to 3.0% by mass is preferable, and 0.06% by mass to 2.5% by mass is more preferable. When the content of polyvinyl alcohol is within this numerical range, the soil can be moderately solidified, so that dust scattering can be suppressed.

[0012] <Hyaluronic acid and hyaluronic acid derivatives> The dust scattering inhibitor according to the embodiment contains at least one selected from hyaluronic acid and hyaluronic acid derivatives. Hyaluronic acid is a type of acidic mucopolysaccharide and is a polysaccharide containing a disaccharide of glucuronic acid and N-acetylglucosamine as a constituent unit. Hyaluronic acid is classified into high molecular weight hyaluronic acid with a weight average molecular weight of 50,000 or more and low molecular weight hyaluronic acid with a weight average molecular weight of less than 50,000. Further, as hyaluronic acid, degraded hyaluronic acid obtained by hydrolysis of hyaluronic acid in the presence of an acid or alkali, degradation by enzymatic treatment such as hyaluronidase, physical cleavage such as ultrasonic waves or shearing, fermentation by microorganisms, etc. may also be used. Furthermore, as hyaluronic acid, a salt of the above-mentioned hyaluronic acid may be used. Examples of salts of hyaluronic acid include salts with alkali metals such as sodium and potassium; salts with alkaline earth metals such as calcium and magnesium, salts with metals such as zinc and aluminum, ammonium salts, basic amino acid salts, amine salts such as triethanolamine, and the like. These may be used alone or in combination of two or more. For hyaluronic acid, those extracted and recovered from natural products, those synthesized as appropriate, or commercially available products may be used.

[0013] Examples of the hyaluronic acid derivative include acetylated hyaluronic acid, sulfated hyaluronic acid, hydrophobized hydrolyzed hyaluronic acid (such as hydrolyzed hyaluronic acid alkyl, hydrolyzed hyaluronic acid glyceryl, hydrolyzed hyaluronic acid alkyl glyceryl, etc.), crosslinked hyaluronic acid, carboxymethyl hyaluronic acid, hyaluronic acid alkylene glycol (such as hyaluronic acid propylene glycol, etc.), hyaluronic acid dimethylsilanol, hyaluronic acid hydroxypropyltrimonium, cationized hyaluronic acid, and salts thereof. Examples of the salt of the hyaluronic acid derivative include salts with alkali metals such as sodium and potassium; salts with alkaline earth metals such as calcium and magnesium, salts with metals such as zinc and aluminum, ammonium salts, basic amino acid salts, and amine salts such as triethanolamine. These may be used alone or in combination of two or more. As the hyaluronic acid derivative, those extracted and recovered from natural products, those appropriately synthesized, or commercially available products may be used.

[0014] The content of at least one selected from hyaluronic acid and hyaluronic acid derivatives is not particularly limited and can be appropriately selected according to the purpose. However, 0.001% by mass to 0.01% by mass is preferable based on the whole dust scattering inhibitor. From hyaluronic acid and hyaluronic acid derivatives When the content of at least one selected is within this numerical range, the soil can be moderately solidified, so that dust scattering can be suppressed.

[0015] <Surfactant> The surfactant is contained to impart a charge to the dust scattering inhibitor and increase the polarity. The surfactant may be a cationic surfactant or an anionic surfactant, but a cationic surfactant is preferable. Examples of cationic surfactants include benzalkonium chloride, benzethonium chloride, methylbenzethonium chloride, cetylpyridinium chloride, etc. These may be used alone or in combination of two or more.

[0016] The content of the surfactant is not particularly limited and can be appropriately selected according to the purpose. For example, 0.01% by mass to 2.0% by mass can be mentioned.

[0017] <Other components> There are no particular restrictions on other components, and they can be appropriately selected according to the purpose. For example, urea and the like can be mentioned. The content of other components is not particularly limited as long as it does not inhibit the performance of the dust scattering inhibitor, and can be appropriately selected according to the purpose.

[0018] <Addition rate of dust scattering inhibitor> The addition rate of the dust scattering inhibitor to the soil can be appropriately selected according to the degree of soil moisture content, etc., but 1% to 30% is preferred.

Examples

[0019] Hereinafter, examples of the disclosed technology will be described, but the disclosed technology is not limited to these examples at all.

[0020] (Examples 1 to 9, Comparative Examples 1 to 2) As the simulated soil, a soil obtained by mixing natural sand (200 g) and black muck soil (200 g) (mixing ratio 1:1) and sieving at less than 2 mm was used. To the simulated soil, 34 g of water or 34 g of the dust scattering inhibitor having the composition shown in Table 1 (with a water content ratio of 20%) was mixed to prepare a sample. Note that Comparative Example 2 was prepared by mixing butylene glycol instead of the hyaluronic acid solution. Table 2 shows the pure component conversion values of polyvinyl alcohol, hyaluronic acid solution, surfactant, and butylene glycol contained in the examples and comparative examples.

[0021] For polyvinyl alcohol, hyaluronic acid, surfactant, and butylene glycol, the following were used. · Polyvinyl alcohol solution (Kaneyonoal, manufactured by Kanebo Soap Co., Ltd., polyvinyl alcohol content: about 8% by mass) · Hyaluronic acid solution (Hada Labo Gokujyun Premium Hyaluronic Emulsion, manufactured by Rohto Pharmaceutical Co., Ltd., hyaluronic acid and hyaluronic acid derivative content: about 0.7% by mass) · Surfactant (50% benzalkonium chloride solution, manufactured by Kanto Chemical Co., Inc.) · Butylene glycol (1,3 - butylene glycol, manufactured by Cafe de Sabon) Hereinafter, hyaluronic acid and hyaluronic acid derivatives are collectively referred to as hyaluronic acid.

[0022] [Table 1]

[0023] [Table 2]

[0024] Regarding the amount of dust scattering in the prepared samples, it was measured using a sealed container (2m × 1m × 1m) as shown in Figure 1. An inlet 2 was provided in the sealed container 1 of Figure 1, and a dust meter 3 (Handheld Particle Counter Model 3889, manufactured by Kanomax) was placed at the lower part inside the sealed container. When the sample is put in from the inlet 2, it falls to the lower part of the sealed container. During the fall and when it lands on the bottom inside the sealed container, dust is generated from the sample. The generated dust was measured by particle size (1μm, 3μm, 5μm, 10μm). For the number of dust particles of each measured particle size, the ratio (suppression ratio) to Comparative Example 1 was calculated. The calculation results are shown in Table 3 and Figure 2. If the value of the suppression ratio is less than 1, it indicates that the dust scattering suppression ability is higher than that of water spraying (Comparative Example 1).

[0025] [Table 3]

[0026] As shown in Table 3 and Figure 2, the dust scattering inhibitors of Examples 1 to 9 have a suppression ratio of less than 1 for the whole particles and can suppress dust with an amount less than that of water. In contrast, Comparative Example 2 containing butylene glycol instead of hyaluronic acid has a suppression ratio of more than 1 for the whole particles, and it is necessary to spray a larger amount than water to suppress dust. From these facts, the dust scattering inhibitor containing polyvinyl alcohol and hyaluronic acid can suppress dust scattering more effectively than water spraying. In addition, in Examples 5 to 8, the suppression ratios of the whole particles, 1 μm, 3 μm, and 5 μm particles are less than 1, but the dust scattering suppression ratio of 10 μm exceeds 1. This is considered that the fine dust with a particle size of 1 μm to 5 μm has gathered and become dust with a larger particle size. That is, in addition to being able to suppress dust scattering more effectively than water spraying, the dust scattering inhibitors of Examples 5 to 8 can suppress the generation of dust with a finer particle size.

[0027] From the above, it has been clarified that the dust scattering inhibitor containing at least one selected from PVA, hyaluronic acid, and hyaluronic acid derivatives can suppress dust scattering more effectively than water spraying.

Claims

1. A dust scattering inhibitor characterized by containing polyvinyl alcohol and at least one selected from hyaluronic acid and hyaluronic acid derivatives.

2. The dust scattering inhibitor according to claim 1, wherein the content of the polyvinyl alcohol is 0.05% by mass to 3.0% by mass.

3. The dust scattering inhibitor according to claim 1 or 2, wherein the content of at least one selected from hyaluronic acid and hyaluronic acid derivatives is 0.001% by mass to 0.01% by mass.

4. The dust scattering inhibitor according to claim 1 or 2, further containing a surfactant.

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