KR102017528B1 - Eco-friendly surface hardner composition for inhibiting scattering dust and method for using the same - Google Patents

Abstract

The present invention relates to a surface curing agent capable of inhibiting scattering dust such as coal or the like and a use method thereof. The surface curing agent comprises: a hydrophilic polymer to form a cured film; a moisturizer; a humectant; and water, and to a use method thereof. According to the present invention, the cured film is formed on the surface of the coal or the like to have an excellent scattering dust suppression effect and excellent durability. In addition, spontaneous ignition of the coal or the like is prevented and the surface curing agent is harmless to a human body and eco-friendly.

Description

ECO-FRIENDLY SURFACE HARDNER COMPOSITION FOR INHIBITING SCATTERING DUST AND METHOD FOR USING THE SAME}

The present invention relates to an environment-friendly surface curing agent for suppressing scattering dust and a method of using the same, and more particularly, to form a cured film on the surface of coal, etc., to have excellent scattering dust suppression effect and durability, and to prevent spontaneous ignition and water resistance ( It relates to an environmentally friendly surface hardener for scattering dust, and a method of using the same.

Shattering dust such as coal powder is at least harmful to the human body. Scatter dust is a particulate matter that floats or scatters in the atmosphere, and is defined as a substance that is discharged directly into the atmosphere without a certain outlet, which is also commonly referred to as fugitive dust or flying dust. Fugitive dust is generated not only on general roads, but also in almost all areas of human life such as various industrial sites. For example, scattering dust is generated in large quantities in factories (yards) such as cement, coal, earth and aggregate, playgrounds, mines, road construction sites, and construction sites.

Floating dust floating in the air contains micro dust of micrometer size and is generally classified as follows according to particle size (diameter).

-TSP (Total Suspended Particles): Total dust suspended in the air of size less than 50㎛

-PM10 (Particulate Matter 10): Fine dust with size less than 10㎛

PM2.5 (Particulate Matter 2.5): Ultrafine dust with a size of 2.5㎛ or less

In particular, the fine dust of less than 10㎛ can be easily introduced into the body through the respirator because it is small enough to be invisible. Fine dust introduced into the body is deposited in the bronchial or alveolar areas, which reduces the function of the lungs, and reduces the body's immune function. Moreover, coal powder etc. have a high spontaneous ignition rate.

As a method of suppressing scattering dust such as coal dust, a method of spraying (spraying) water is typical, which is also the cheapest method. However, water spraying (spraying) is less effective in suppressing scattering dust than water consumption, and in winter, it is frozen after spraying, increasing the risk of falling to workers, and inconvenience of having to continuously spray large quantities due to rapid evaporation of water in summer. There is a ham.

Accordingly, various methods for suppressing scattering dust have been proposed, and are typically a method of spraying (spraying) a scattering dust inhibitor. Dust scatter inhibitors have an advantage of high durability and at least compared to water injection. Most scattering dust inhibitors are based on inorganic compounds such as magnesium chloride (MgCl ₂ ), calcium chloride (CaCl ₂ ) and calcium carbonate (CaCO ₃ ), which are commercialized. In this regard, Korean Patent No. 10-0494538, Korean Patent No. 10-1057107, Korean Patent No. 10-1561583 and the like have scattered dust mainly composed of magnesium chloride (MgCl ₂ ) or calcium chloride (CaCl ₂ ). Inhibitors are shown.

However, the scattering dust inhibitor according to the prior art, for example, has the following problems.

First, the inorganic compound used as the main component has a weak cohesive ability of scattering dust and has a low scattering dust suppression effect compared to the amount used. In addition, magnesium chloride (MgCl ₂ ), calcium chloride (CaCl ₂ ) and the like increases the salinity of the soil, which hinders plant growth and causes acidification of the soil. In addition, corrosion of the injection equipment can also be caused. Above all, the scattering dust inhibitor according to the prior art has a problem in that the persistence of the scattering dust suppressing effect is lowered and the spontaneous ignition prevention ability is low. In addition, due to the low water resistance (water repellency) and the formation of a weak film, there is a problem that is difficult to use during the occurrence of rainfall and strong wind.

Korean Patent Registration No. 10-0494538 Korean Patent Registration No. 10-1057107 Korea Patent Registration No. 10-1561583

Accordingly, an object of the present invention is to provide a surface curing agent that can be usefully used as a scattering dust inhibitor and a method of using the same.

Specifically, an object of the present invention is to provide an environmentally friendly surface hardener and a method of using the same, which can effectively suppress scattering dust such as coal powder, have excellent durability, and have no harm to humans and are environmentally friendly.

In addition, the present invention has a good water resistance (water repellency) to form a strong cured coating is excellent in the scattering dust suppression during rain or strong winds, it is possible to prevent spontaneous ignition of coal powder, etc., with improved storage stability and the like An object of the present invention is to provide an environment-friendly surface hardener and a method of using the same.

The present invention to achieve the above object,

As a surface hardening agent which forms a cured film on a to-be-processed object and suppresses scattering dust,

Hydrophilic polymer to form a cured film;

Humectants;

Wetting agents; And

It provides a surface hardener comprising water.

In accordance with an embodiment of the present invention, the surface hardener further comprises an antistatic agent, wherein the antistatic agent may be selected from cationic and zwitterionic (bipolar) surfactants and the like. In addition, the hydrophilic polymer, preferably comprises a vinyl acetate copolymer (vinylacetate copolymer).

According to an embodiment of the present invention, the surface hardener is 5.0 to 30.0% by weight of the hydrophilic polymer, 2.0 to 20.0% by weight of the moisturizer, 0.1 to 30.0% by weight of the humectant, 0.1 to 15.0% by weight of the antistatic agent and 15.0 to 70.0 of the water It may include weight percent. In addition, the surface curing agent is a white paste formulation, may have a viscosity of 50 ~ 300cps.

The present invention also provides a method of using the surface curing agent. According to the embodiment of the present invention, the surface curing agent can be used by a method of diluting with water of 10 to 100 times and spraying to the object such as coal.

According to the present invention, it can be usefully used as a scattering dust inhibitor, there is provided a surface hardening agent having improved properties other than the scattering dust suppression ability and a method of using the same.

Specifically, according to the present invention, it has the effect of effectively suppressing scattering dust such as coal powder, and excellent durability of scattering dust suppression. In addition, according to the present invention, it is harmless to the human body and environmentally friendly, having a good water resistance (water repellency) while forming a strong cured film has an effect that can be used even during rain or strong wind. In addition, spontaneous ignition such as coal powder can be prevented, and storage stability and the like are improved.

1 is a test photograph (before the strong wind spinning) to determine the scattering dust suppression ability for the surface curing agent according to the Examples and Comparative Examples of the present invention.
2 to 4 is a photograph (before / after the strong wind radiation) before and after the test for determining the scattering dust suppression ability for the surface curing agent according to the Examples and Comparative Examples of the present invention.
5 is a test photograph (after a strong wind spinning) to determine the scattering dust suppression ability for the surface curing agent according to the Examples and Comparative Examples of the present invention.

As used herein, the term "and / or" is used in a sense including at least one or more of the components listed before and after. As used herein, the term "one or more" means one or more than one.

According to the first aspect, the present invention provides a surface curing agent that forms a cured coating on a to-be-processed object such as coal and at least suppresses (prevents) scattering dust. According to a second aspect, the present invention provides a method for producing the surface hardener. Moreover, this invention provides the use method of the said surface hardening | curing agent in 3rd aspect. Specifically, the present invention provides a method for suppressing scattering dust which suppresses scattering dust using the surface curing agent according to the third aspect.

In the present invention, "scattered dust" is a particulate matter commonly used in the art, which is a general dust suspended in the air, as well as TSP (Total Suspended Particles), PM10 (Particulate Matter 10) and PM2.5 (Particulate Matter 2.5) and the like. Such as fine dust and the like. The scattering dust contains powders such as smoke, flower powder, coal powder, stone powder, soil powder, gypsum powder, cement powder and / or concrete powder, for example.

In addition, in the present invention, the to-be-processed object to be treated, that is, the to-be-processed object to which the scattering dust inhibitor according to the present invention is applied (for example, spraying) is a to-be-processed object from which scattering dust is generated and / or scattering dust Contains the object to be processed. The object includes the atmosphere, which also includes, for example, various roads such as general roads (paved and unpaved roads), forest roads and timber transport roads; Yards such as coal, gypsum board, steelmaking, concrete and cement factories; Various industrial sites such as mines, construction sites and road construction sites; Soil in which various plants such as trees, flowers and fruit trees are grown; Animal kennels; And / or other dust-generating ground; Etc. can be mentioned. Hereinafter, in describing the present invention, the object to be treated will be described taking coal as an example.

The surface curing agent according to the present invention is a scattering dust suppression composition having at least a function of suppressing scattering dust, comprising: a hydrophilic polymer for forming a cured film; Humectants for moisturizing and viscosity; Wetting agents for wetting; And water. The surface curing agent according to the present invention has a white paste formulation containing the above components in an appropriate content, for example, having a viscosity (@ 20 ° C.) of 50 to 300 cps.

The surface curing agent according to the present invention is applied (for example, sprayed) to the surface of the workpiece to form a thin cured film to suppress at least scattering dust. For example, after being injected into a coal pile such as a coal yard, a hardened film is formed on the surface of the coal pile to prevent scattering of coal powder.

The hydrophilic polymer acts as a film forming agent for forming the active ingredient of the cured coating film. The hydrophilic polymer (film forming agent) is not particularly limited as long as it is water soluble (hydrophilic) and can form a cured film on the surface of coal. According to a preferred embodiment of the present invention, the hydrophilic polymer preferably comprises at least one selected from vinyl acetate copolymer and natural polysaccharide. The hydrophilic polymer more preferably comprises a mixture of vinyl acetate copolymer and natural polysaccharide.

 The vinyl acetate copolymer and the natural polysaccharide are water soluble, and these are preferred for the present invention by forming a strong cured film on the surface of coal or the like. These vinyl acetate copolymers and natural polysaccharides maintain a cured film for a long time while effectively suppressing scattering dust and thus have high sustainability of scattering dust suppression. In addition, the vinyl acetate copolymer and the natural polysaccharide are faster than the other hydrophilic polymers (eg, polyacrylic series) and excellent in initial adhesion, and have water resistance (water repellency) to prevent water penetration by rainwater.

The vinyl acetate copolymer may be, for example, a vinyl acetate-acrylate copolymer, which is a copolymer of vinyl acetate and acrylate. As for the said vinyl acetate copolymer, More preferably, the vinyl acetate-acrylate copolymer which added ionicity can be used usefully. The ionic vinyl acetate-acrylate copolymer is excellent in scattering dust suppression ability, persistence, fast drying and water resistance (water repellency), etc., of course, it is particularly preferred in the present invention having ionic properties added to prevent the generation of static electricity.

In the present invention, the ionic vinyl acetate-acrylate copolymer may be selected from those in which ionic metals are bonded. In this case, the ionic metal may be bonded to vinyl acetate, acrylate, or both thereof, and specifically, it may be coordinated to oxygen contained in vinyl acetate and / or acrylate.

The ionic metal may be, for example, metal cations such as Mg, Li, Na, K, Ca and / or Ba; Ionic metal compounds (metal salts) containing anions such as PF ₆ , BF ₄ , ClO ₄ and / or NO ₃ may be bonded by reacting with the vinyl acetate-acrylate copolymer. Specific examples of the ionic metal compound include Mg compounds (Mg (NO ₃ ) _2, etc.) and / or Li compounds (LiPF ₆ and LiClO _4). And the like). The ionic vinyl acetate-acrylate copolymer has a structure in which metal ions such as Mg, Li, Na, K, Ca, and / or Ba are coordinated in a molecule by reaction with the above ionic metal compound. It can have

The ionic vinyl acetate-acrylate copolymer is a solution after adding the ionic metal compound to a copolymerizable solution containing, for example, a vinyl acetate monomer (or polyvinylacetate), an acrylic monomer, a polymerization initiator and a solvent. The thing obtained by superposing | polymerizing can be used.

Examples of the acrylic monomers include 2-ethylhexyl acrylate, ethyl acrylate, butyl acrylate, hydroxyethyl acrylate, and / or acrylic acid. Examples of the polymerization initiator include benzoyl peroxide and lauryl peroxide. Oxides and / or azobisisobutyronitrile and the like. Examples of the solvent include methyl ethyl ketone, isopropanol, toluene, ethyl acetate and / or butyl acetate, and the like. In addition, the ionic vinyl acetate-acrylate copolymer may use a commercially available product.

According to the present invention, the above ionic vinyl acetate-acrylate copolymer has at least scattering dust suppression ability, persistence, fast drying and water resistance (water repellency), etc., which in particular has ionicity by binding of the ionic metal compound. It has an ability to suppress static electricity generation by itself. Accordingly, it is possible to prevent spontaneous ignition by the static electricity when applied to the object to be treated such as coal.

In addition, the natural polysaccharide may be used at least one selected from sodium alginate, xanthan gum, guar gum, gellan gum and locust bean gum. Can be. Such natural polysaccharides can impart moisture retention and wettability to the cured coating, thereby improving the persistence of scattering dust suppression.

The hydrophilic polymer is not particularly limited, but may be included in, for example, 2.0 to 50.0 wt% based on the total weight of the surface curing agent (100 wt%). At this time, when the content of the hydrophilic polymer is less than 2.0% by weight, it may be difficult to form a good cured film. In addition, when the content of the hydrophilic polymer is more than 50.0% by weight, the content of other components (such as a moisturizer and a humectant) is relatively low, the moisturizing and wetting properties may not be good or the dispersibility may be low. In consideration of this point, the hydrophilic polymer is preferably included in 5.0 to 30.0% by weight. The hydrophilic polymer may include a vinyl acetate copolymer and a natural polysaccharide, but the vinyl acetate copolymer and the natural polysaccharide may be mixed and used in a weight ratio of 1: 0.5 to 2.0.

The moisturizing agent is for moisturizing and viscosity, which may be selected from water-soluble moisturizing materials. Moisturizing agents can be selected from, for example, natural polysaccharides and glycols. The moisturizing agent may be, for example, one or more selected from sorbitol, butylene glycol, glycerin, hyaluronic acid, sodium hyaluronic acid, trehalose, propanediol, polyethylene glycol, and the like, but is not limited thereto.

The moisturizing agent may be included, for example, 0.5 to 30.0% by weight based on the total weight of the surface curing agent (100% by weight). In this case, when the content of the moisturizing agent is less than 0.5% by weight, the degree of improvement of the moisturizing power and viscosity due to the addition thereof may be insignificant, and when the content of the moisturizing agent is more than 30.0% by weight, it is difficult to form a good cured film, or Too high may result in poor usability (eg spraying). In consideration of this point, the moisturizing agent is preferably included in 2.0 to 20.0% by weight.

The humectant is not particularly limited as long as it gives wettability (moisture) to the surface of coal or the like. The humectant may usefully use a water-soluble nonionic surfactant. In the case of using a nonionic surfactant as the wetting agent, it is preferable because not only the wettability (wetting) can be provided, but also the dispersibility of the surface curing agent can be improved.

As said wetting agent, nonionic surfactant, such as polyoxyethylene, sorbitan, amide, and / or amine, can be used specifically ,. The wetting agent is more preferably at least one selected from sorbitan monooleate, sorbitan monolaurate, lauryl diethyl amine oxide, palm oil alkyldimethylamine oxide, palm oil fatty acid diethanol amide, palm oil fatty acid monoethanol amide, and the like. It can be useful.

The humectant may be included, for example, 0.1 to 30.0 wt% based on the total weight of the surface curing agent (100 wt%). At this time, when the content of the humectant is less than 0.1% by weight, the effect of maintaining the wettability (moisture) and dispersibility improvement according to the addition thereof may be lowered, and when the content of the humectant exceeds 30.0% by weight, it is difficult to form a good cured film Can be. In consideration of this point, the wetting agent may be included in an amount of 2.0 to 20% by weight.

The water is used as a dispersing and / or dilution solvent, for example tap water, distilled water and / or purified water and the like can be used. In addition, water may be included, for example, 10.0 to 80.0% by weight, 15.0 to 70.0% by weight, or 20.0 to 65.0% by weight based on the total weight of the surface curing agent, but is not limited thereto.

In addition, according to another embodiment of the present invention, the surface hardener according to the present invention may further include an antistatic agent for preventing static electricity. The static electricity generation inhibitor is not particularly limited as long as it can prevent the generation of static electricity, which can be usefully applied to the processed material such as coal having a high rate of spontaneous combustion.

The static electricity generation inhibitor may preferably be selected from cationic surfactants and / or zwitterionic (bipolar) surfactants and the like. In this case, the cationic surfactant may be selected from, for example, alkyltrimethylammonium chloride, trimethylamine hydrochloride and / or dodecylpyridinium chloride, and the zwitterionic surfactant may be, for example. Cocamidopropylbetaine, lauryldimethylaminoacetic acidbetaine, lauryldimethylamineoxide, laurylaminodiacetic acid monosodium, sodium N-lauroylglutamate and / or 2-alkyl-N-carboxymethyl-N- Hydroxyethylimidazolium betaine and the like, but is not limited thereto.

The static electricity generation inhibitor may be included, for example, 0.1 to 15.0% by weight based on the total weight of the surface hardener. At this time, when the content of the static electricity generation inhibitor is less than 0.1% by weight, the effect of suppressing static electricity generated by the addition thereof may be insignificant. And when the content of the static electricity generation inhibitor exceeds 15.0% by weight, the synergistic effect of the excessive use is not very small and the content of other components is relatively low, the scattering dust suppression ability may be lowered. In consideration of the ability to suppress static electricity generation and scattering dust, etc., the static electricity generation inhibitor is preferably included in an amount of 0.2 to 10.0% by weight.

In addition, according to another embodiment of the present invention, the surface curing agent according to the present invention may further include a crosslinking agent. Such crosslinking agents may be selected from crosslinkable compounds that crosslink the hydrophilic polymer, humectant and / or humectant. The crosslinking agent may be selected from appropriate compounds depending on the type of hydrophilic polymer, humectant and / or humectant.

According to a preferred embodiment, the crosslinking agent may use at least one selected from glycidyl ether and ester-based compounds represented by the following formula.

[Formula]

(In the above formula, R ¹ and R ² are the same as or different from each other, and are an alkyl group having 1 to 3 carbon atoms.)

The glycidyl ether may be, for example, one or more selected from ethanediol diglycidyl ether, butanediol diglycidyl ether, and the like. Such glycidyl ether can be usefully used, for example, when the hydrophilic polymer and / or humectant contains natural polysaccharides such as hyaluronic acid and gum. Examples of the ester compound of the above formula include glyoxylic acid ester compounds in which R ¹ and R ² are a methyl group or an ethyl group. The ester compound of the above formula may be usefully used, for example, when the hydrophilic polymer comprises a vinyl acetate copolymer. Such a crosslinking agent can form a strong cured film to improve scattering dust suppression ability and can effectively prevent the collapse of the object such as coal during rainfall or strong winds.

The crosslinking agent may be included in an amount of 0.1 to 5.0 wt% based on the total weight of the surface curing agent. In this case, when the crosslinking agent is less than 0.1% by weight, the effect of the addition thereof may be insignificant. And when the crosslinking agent is more than 5.0% by weight, the viscosity is too high and spraying is difficult, and after spraying, the cured coating may become too hard. In consideration of this point, the crosslinking agent is preferably included in 0.5 to 3.0% by weight based on the total weight of the surface curing agent.

In addition, the surface hardener according to the present invention may further include an antioxidant, a colorant and / or a storage stabilizer.

The antioxidant may be capable of preventing oxidation, which may be selected from, for example, sodium sulfide and ascorbic acid. Such antioxidant may be included, for example, 0.01 to 5.0% by weight based on the total weight of the surface hardener.

The colorant may be any color, and for example, it may be selected from inorganic materials such as titanium dioxide (TiO ₂ ) and talc (Talc, talc). Such colorant may be included, for example, 0.01 to 5.0% by weight based on the total weight of the surface hardener.

The storage stabilizer may have storage stability, and for example, a phosphorus-based dispersant or a surfactant may be used. According to an embodiment of the present invention, the storage stabilizer may advantageously use an ester compound having at least one hydroxyl group (-OH) and at least one ether group (-O-) in a molecule.

Specific examples of the storage stabilizer include 1-benzoxy-2-hydroxy-carboxylic acid ester and the like. The 1-benzoxy-2-hydroxy-carboxylic acid ester contains a hydroxyl group (-OH) and an ether group (-O-) in the molecule, and even when the surface curing agent on the paste is stored for a long time, precipitation or layer separation may occur. Can be effectively prevented. Such storage stabilizers may be included, for example, 0.1 to 5.0% by weight based on the total weight of the surface hardener.

In addition, the surface curing agent according to the present invention may further include other functional components or additives as necessary. The surface hardener according to the present invention may further include, for example, an antifreeze agent, an antifoaming agent, a dispersant, a surfactant, and / or a viscosity modifier, and the like may be added in an appropriate amount in a range that does not reduce scattering inhibitory ability.

In addition, the surface curing agent according to the present invention has a formulation of the paste (viscosity of 50 ~ 300cps, @ 20 ℃), the solid content may be 30 to 60% by weight, or 40 to 50% by weight based on the total weight. And it may have a white color, and in some cases may further have a color other than white, further comprising a color colourant. At this time, in the case of having a white color, workability may be improved when applied to, for example, coal. Specifically, by forming a white cured film on the surface of black coal, it is possible to clearly observe the part where the surface curing agent is applied (for example, sprayed) and the part that is not applied with the naked eye to improve workability.

The surface hardening | curing agent which concerns on this invention demonstrated above has at least the following effect.

First, the surface curing agent according to the present invention forms a cured coating on the surface of a workpiece such as coal to suppress (prevent) the scattering of dust (coal powder, etc.) or dust to be scattered, and to maintain a long time due to high moisture and wettability. It keeps moist for a long time and has the persistence of scattering dust suppression effect. In addition, workability is improved as quick drying property, harmless to the human body and environmentally friendly characteristics, in particular, it is possible to prevent the loss of fire and fire by preventing spontaneous ignition such as coal powder. In addition, it has water resistance (water repellency) to protect the object to be treated from rainwater, and excellent storage stability allows long-term storage.

On the other hand, the surface curing agent according to the present invention can be used through a method such as, for example, when applied to the workpiece to suppress scattering dust. In addition, when applied by a spraying method, it may be diluted with separate water and used. According to one embodiment, it can be used through the following method of use of the present invention.

The surface hardening agent which concerns on this invention is used by the method of diluting water to a weight ratio (or volume ratio) of 10-100 times here, and spraying to a to-be-processed object. Specifically, to obtain a treatment liquid (dilution liquid) diluted to a surface curing agent: water = 1: 10 to 100 by weight ratio (or volume ratio), and then using the spraying device (e.g., sprinkling water) as the treatment liquid (dilution liquid) It is used by the method of spraying (spraying) to to-be-processed object, such as coal, and forming a hardened film.

According to a preferred embodiment, the treatment liquid (dilution liquid) obtained by diluting water to a weight ratio (or volume ratio) of 10 to 100 times in the treatment liquid (dilution liquid), specifically the surface curing agent of the present invention, is, for example, 20 to It is recommended to have a viscosity of 600 cps. In the case of using a treatment liquid having such a viscosity, a good cured film is formed upon spraying on a target object such as coal, which can also improve quick-drying and spraying workability (spraying by spraying water). In this case, when the viscosity of the treatment liquid (dilution liquid) is less than 20 cps, it is difficult to form a good cured coating, and when the viscosity exceeds 600 cps, curing may take a long time or injection may not be free. In consideration of this point, the treatment liquid (dilution liquid) more preferably has a viscosity of 50 ~ 500cps. Here, a viscosity is a viscosity (normal temperature measured value) measured in actual use sites, such as a coal yard.

In addition, when the surface curing agent of the present invention further comprises a crosslinking agent as described above, the treatment liquid may be increased in viscosity, for example, it may have a viscosity of 300 cps or more, specifically 300 to 1,500 cps have. Such a high viscosity treatment liquid can form a hard cured film, and thus can be usefully used during rainfall or strong winds.

Hereinafter, the Example and comparative example of this invention are illustrated. The following examples are provided by way of example only to help the understanding of the present invention, whereby the technical scope of the present invention is not limited.

Example 1

The stirrer puts water (distilled water) into the vessel otherwise, and then a vinyl acetate copolymer as a hydrophilic polymer (film forming agent) and sodium alginate as a moisturizer, hyaluronic acid as a moisturizing agent and a nonionic surfactant as a wetting agent. A proper amount of was added and stirred to prepare a surface paste of a white paste having a viscosity of about 120 cps (@ 20 ° C). In this case, the hydrophilic polymer (film forming agent) was used by mixing a vinyl acetate copolymer and sodium alginate in a weight ratio of 1: 1.

In addition, an ionic vinyl acetate-acrylate copolymer was used as the vinyl acetate copolymer, which specifically includes ions in a copolymerizable solution containing vinyl acetate, 2-ethylhexyl acrylate, hydroxyethyl acrylate, and acrylic acid. Mg compound (Mg (NO ₃ ) ₂ ) was added as a metal compound and polymerized, and it was purchased from Korea Hansung Polymer and used. The sodium alginate and hyaluronic acid were used to purchase food grade of the domestic food raw materials. The nonionic surfactant as the humectant is sorbitan monolaurylate, which is mainly used as a material for cosmetics, which was purchased from a domestic support firm.

Specific components and contents of the surface curing agent according to the present embodiment are shown in the following [Table 1]. In Table 1, the content of each component is a percentage (wt%) based on the total weight of the surface curing agent.

Example 2

In contrast to Example 1, it was carried out in the same manner as in Example 1 except that the kind of the hydrophilic polymer (film forming agent) was changed. Specifically, vinyl acetate-acrylate copolymer was used as the hydrophilic polymer, which used no added ionicity. Specific components and contents of the surface curing agent according to the present embodiment are as shown in the following [Table 1].

Example 3

In contrast to Example 1, it was carried out in the same manner as in Example 1 except that the kind of the hydrophilic polymer (film forming agent) was changed. Specifically, polyacrylamide (polyacryl amide, PAM) was used as the hydrophilic polymer. Specific components and contents of the surface curing agent according to the present embodiment are as shown in the following [Table 1].

[Examples 4 to 5]

In contrast to Example 1, it was carried out in the same manner except that the static electricity generating inhibitor was further added. The antistatic agent used cocamidopropylbetaine as a zwitterionic surfactant. At this time, the content of the static electricity generation inhibitor was varied according to each embodiment (4 to 5). Specific components and contents of the surface curing agent according to the present embodiments are as shown in the following [Table 1].

[Examples 6 to 7]

In contrast to Example 5, it was carried out in the same manner except that a storage stabilizer was further added. At this time, the type of storage stabilizer was different according to each embodiment (6 ~ 7). Specific components and contents of the surface curing agent according to the present embodiments are as shown in the following [Table 1].

With respect to the surface curing agent according to each of the examples (1 to 7) prepared as described above, the antistatic ability and storage stability were evaluated as follows. The results are shown in the following [Table 1].

<Test Example 1>: Evaluation of static suppression capacity

The surface curing agent according to each embodiment was coated on a glass plate, and then heat-treated to form a cured film. Then, the surface resistance [피 / sq] was measured for the cured film according to each of the specimens by using a 4-point probe in accordance with ASTM D 257. (Condition: applied voltage 10V, temperature 22 ± 2 ℃, relative humidity 50 ± 5% RH) And the surface resistance value was evaluated for the electrostatic suppression ability.

<Test Example 2>: storage stability evaluation

The surface curing agent according to each embodiment was placed in a transparent constant temperature and humidity bath for 10 days under high temperature / high humidity conditions of 80 ° C. and 60% humidity, and then stored for 5 days at a low temperature of 4 ° C., followed by a temperature of 80 ° C., After storage for 10 more days under high temperature / humidity condition of 60% humidity, it was observed visually whether precipitation and delamination occurred. The storage stability was evaluated according to the following criteria, and the results are shown in the following [Table 1].

<Storage stability evaluation criteria>

◎: When no precipitation or delamination occurs

○: when any of precipitation and separation

△: both precipitation and separation

         <Composition and Characteristic Evaluation Results of the Surface Curing Agent According to Each Example> Remarks Example One 2 3 4 5 6 7 Hydrophilic polymer
(Film forming agent) VA ^* -A ⁽¹⁾ 6.0 - - 6.0 18.0 18.0 18.0 Sodium alginate 6.0 - - 6.0 15.0 15.0 15.0 VA-A ⁽²⁾ - 12.0 - - - - - PAM ⁽³⁾ - - 12.0 - - - - Moisturizer Hyaluronic acid 5.0 5.0 5.0 5.0 5.0 5.0 5.0 Humectant SBML ⁽⁴⁾ 5.0 5.0 5.0 5.0 5.0 5.0 5.0 Static electricity inhibitor COPB ⁽⁵⁾ - - - 3.0 6.0 6.0 6.0 Storage stabilizer A1 ⁽⁶⁾ - - - - - 2.5 - A2 ⁽⁷⁾ - - - - - - 2.5 Distilled water Remaining amount Remaining amount Remaining amount Remaining amount Remaining amount Remaining amount Remaining amount Surface resistance [Ω / sq]
(x 10 ⁶ ) 3.86 4.91 4.65 3.71 3.64 3.67 3.73 Storage stability
(After long-term storage of high temperature and high humidity) ○ ○ ○ ○ △ ○ ◎
(1) VA ^* -A: ionized vinylacetate-acrylate copolymer
(2) VA-A: vinyl acetate-acrylate copolymer
(3) PAM: polyacryl amide
(4) SBML: sorbitan monolaurate
(5) COPB: cocamidopropyl betaine
(6) A1: Phosphorus-based dispersant (BYK-154 product)
(7) A2: ester compound having a hydroxyl group (-OH) and an ether group (-O-)
(1-benzoxy-2-hydroxy-carboxylic acid ester)

As shown in Table 1 above, in contrast to Examples 1 to 3, the ionic vinyl acetate-acrylate copolymer (VA ^* -A) was used as the hydrophilic polymer (Example 1). The surface resistance [k / sq] was evaluated lower than the case (Examples 2 and 3). From these results, it was found that the ionic vinyl acetate-acrylate copolymer (VA ^* -A) is preferable in the ability to suppress static electricity generation.

In addition, in contrast to Examples 1 and 4 to 7, when cocamidopropyl betaine (COPB) is added as a static electricity generating inhibitor (cationic surfactant) (Examples 4 to 7), its content is As it can be seen that the ability to suppress the generation of static electricity can be improved. In contrast to Example 4 and Example 5, when the content of the hydrophilic polymer is somewhat high (Example 5), the storage stability is lowered.

In addition, in comparison with Examples 5 to 7, it was found that the storage stability is improved compared to the case where the storage stabilizer is added (Examples 6 and 7), otherwise (Example 5). In addition, the storage stabilizer in the case of an ester compound (1-benzoxy-2-hydroxy-carboxylic acid ester) having a hydroxyl group (-OH) and an ether group (-O-) than when using a phosphorus-based dispersant (Example 6) ( It was found that Example 7) had excellent storage stability even in harsh conditions of high temperature / high humidity.

<Test Example 3>: evaluation of scattering dust suppression ability (1)

First, 50 times (weight ratio) of water was added to each of the surface curing agents according to Examples 1 and 2, and diluted to prepare dilutions according to each test specimen. In addition, a solution obtained by diluting an existing product mainly composed of calcium carbonate with 5 times water was used as a comparative specimen. Each dilution sample is shown in Table 2 below.

                  <Diluent for each specimen> Comparative specimen  Existing calcium carbonate product + 5 times water dilution Conduct Psalm 1  Surface Hardener of Example 1 + 50 Times Water Dilution Conduct Psalm 2  Surface Hardener of Example 2 + 50 Times Water Dilution

Each dilution sample was applied to a pile of coal as follows, and then scattering dust was inhibited by a method of spinning strong winds on the pile of coal. 1 is a photograph before the test (before the strong wind radiation).

Specifically, as shown in FIG. 1, three coal piles were stacked in a closed space, and the diluents according to Comparative Specimen, Test Specimen 1 and Test Specimen 2 were applied to each coal pile, and then dried. In FIG. 1, the leftmost is a test photograph of the comparative specimen, the middle is a test photograph of the practice specimen 1, and the rightmost is a test photograph of the test specimen 2.

As above, each diluted liquid sample was applied to a pile of coal and dried, and then a strong wind was radiated to each pile of coal using a blower. All conditions are the same. Before and after the strong wind spinning is shown in Figures 2 to 5 attached.

2 is a photograph showing the state before and after the strong wind radiation of the comparative specimen, Figure 3 is a photograph showing the state before and after the strong wind radiation of the test specimen 1, Figure 4 is a state before and after the strong wind radiation of the test specimen 2 It is a photograph. 5 is a photograph showing the state after the strong wind radiation for the three specimens.

As shown in Figures 2 to 5, it can be seen that the test specimens using the surface hardener according to Examples 1 and 2 are less scattered of coal powder due to strong winds than conventional calcium carbonate products (comparative specimens).

In particular, coal and vinyl acetate-acrylate copolymers and natural polysaccharides (sodium alginate) are mixed and used as hydrophilic polymers (Example 1), compared with the case where vinyl acetate-acrylate copolymers are used alone (Example 2). It was found that scattering of the powder hardly occurred, and thus had excellent scattering dust suppression ability.

[Examples 8 to 9]

A surface curing agent was prepared in the same manner as in Example 1 except that a crosslinking agent was further added to the surface curing agent in comparison with Example 1 above. Specific components and contents of the surface curing agent according to the present embodiments (8 to 9) are shown in the following [Table 3]. In Table 3, the content of each component is a percentage (wt%) based on the total weight of the surface curing agent.

<Test Example 4>: evaluation of scattering dust suppression ability (2)

About 50 times (weight magnification) of water was added to the surface curing agent prepared according to each of Examples (8 to 9), followed by sufficiently stirring to obtain a viscous liquid having increased viscosity. Each viscous liquid thus obtained was tested as follows.

Select four areas (A, B, C, D area) where a lot of fine dust is discharged, measure the initial concentration and the concentration after spraying for each area, and then remove the fine dust according to [Equation 1] %) Was evaluated. In addition, the fine dust removal rate (%) of each region was evaluated in the same manner with respect to the dilution solution in which water of about 50 times (weight ratio) was added to the surface hardeners according to Examples 1 and 2 above. In addition, the dust removal rate (%) of each region was evaluated using only water spray as a control. It was. The above results are shown in the following [Table 3].

[Equation 1]

x 100Fine dust removal rate (%) =

x 100

In Equation 1 above, the concentration before spraying is the fine dust concentration (initial concentration) of each region measured before spraying the surface curing agent, and the concentration after spraying is the fine dust concentration of each region measured after spraying the surface curing agent.

The fine dust concentration (concentration before spraying and after spraying) is applied to the particulate matter suspended in the air in each region (A, B, C, D region) by using a low volume air sampler method. The particulate matter was collected by the collecting method, and then the concentration was measured according to [Equation 2]. At this time, the low volume air sampler was a cyclone type, the trapped particles were 10 μm or less in diameter, the suction flow rate was 25 L / min (0.025 m 3 / min), and the operating time was 1 hour. For example, in the area A in which Example 1 was injected, the concentration (initial concentration) before the injection was measured according to the following [Equation 3].

[Equation 2]

Fine dust concentration (g / ㎥) =

[Equation 3]

= 0.024667 g/㎥Fine dust concentration (g / ㎥) =

= 0.024667 g / m 3

     <Evaluation of Composition and Scattering Dust Suppression Performance of Surface Curing Agent> Remarks Example 1 Example 2 Example 8 Example 9 Control Hydrophilic polymer
(Film forming agent) VA ^* -A ⁽¹⁾ 6.0 - 6.0 6.0 Water jet Sodium alginate 6.0 - 6.0 6.0 VA-A ⁽²⁾ - 12.0 - - Moisturizer Hyaluronic acid 5.0 5.0 5.0 5.0 Humectant SBML ⁽³⁾ 5.0 5.0 5.0 5.0 Crosslinking agent BDDE ⁽⁴⁾ - - 0.8 0.4 GO-Ac ⁽⁵⁾ - - - 0.4 Distilled water Remaining amount Remaining amount Remaining amount Remaining amount fine dust
Removal rate
(%) A area 71.1 68.7 74.6 78.9 17.4 B area 76.9 72.7 78.2 78.6 21.3 C area 79.4 76.5 82.4 84.3 19.8 D area 82.3 82.3 82.7 85.6 24.1
(1) VA ^* -A: ionized vinylacetate-acrylate copolymer
(2) VA-A: vinyl acetate-acrylate copolymer
(3) SBML: sorbitan monolaurate
(4) BDDE: 1,4-Butanediol Diglycidyl Ether
(5) GO-Ac: methyl glyoxylate methyl-hemiacetal
(CH ₃ -CH (OH) -CO-O-CH ₃ )

As shown in Table 3, when spraying the surface curing agent according to the embodiments, it can be seen that the fine dust removal rate is very excellent compared to the water spray only control.

On the other hand, in contrast to the embodiments in Table 3, when the ionic vinyl acetate-acrylate copolymer (VA ^* -A) and natural polysaccharides (sodium alginate) is used as a hydrophilic polymer (Example 1 ) Showed that scattering dust suppression ability was higher than that of the vinyl acetate-acrylate copolymer alone (Example 2).

In addition, it was found that the addition of a crosslinking agent (Example 8 and Example 9) has excellent scattering dust suppression ability as compared with the case where it is not (Example 1 and Example 2). In addition, in comparison with Example 8 and Example 9, it can be seen that the case of using both types of crosslinking agent (Example 9) is superior to the case of using one type of crosslinking agent (Example 8).

Claims (6)

It is a surface hardening agent which forms a cured film on a to-be-processed object and suppresses scattering dust,
Hydrophilic polymer to form a cured film;
Humectants;
Wetting agents; And
Contains water,
The hydrophilic polymer includes vinyl acetate-acrylate copolymer and natural polysaccharides,
Comprising 5.0 to 30.0% by weight of the hydrophilic polymer based on the total weight of the surface curing agent,
The vinyl acetate-acrylate copolymer is a surface curing agent, characterized in that it comprises an ionic vinyl acetate-acrylate copolymer in which metal ions are bonded by reaction with a metal compound.
The method of claim 1,
The hydrophilic polymer comprises an ionic vinyl acetate-acrylate copolymer and natural polysaccharides in a weight ratio of 1: 0.5 to 2.0,
The natural polysaccharide includes sodium alginate,
The metal ion bonded to the ionic vinyl acetate-acrylate copolymer is at least one metal ion selected from Mg, Li, Na, K, Ca and Ba.
The method of claim 1,
The surface hardener further includes an antistatic agent,
Based on the total weight of the surface hardener,
5.0 to 30.0 wt% of the hydrophilic polymer;
2.0 to 20.0% by weight of the moisturizing agent;
0.1 to 30.0 wt% of the humectant;
0.1-15.0 wt% of the static electricity generating inhibitor; And
It contains 15.0 to 70.0% by weight of water,
The viscosity is 50-300cps,
A surface curing agent having a white paste formulation.
The method of claim 1,
The surface curing agent further comprises a crosslinking agent,
The crosslinking agent,
Glycidyl Ether (Glycidyl Ether) for the crosslinking of the natural polysaccharides,
Surface cross-linking agent for the cross-linking of the vinyl acetate-acrylate copolymer, comprising an ester compound represented by the following formula.
[Formula]

(In the above formula, R ¹ and R ² are the same as or different from each other, and are an alkyl group having 1 to 3 carbon atoms.)
The method of claim 4, wherein
The surface hardener further comprises a storage stabilizer,
The storage stabilizer is a surface hardener, characterized in that it comprises an ester compound having a hydroxyl group (-OH) and an ether group (-O-) in the molecule.
After obtaining a treatment solution in which water is diluted in a weight ratio of 10 to 100 times to the surface hardener according to any one of claims 1 to 5, the treatment solution is sprayed onto the object to be used. How to use the surface hardener.

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