KR100241012B1 - Surface treating agent for powder to be stored outdoors - Google Patents

Abstract

The present invention relates to a treatment agent for coating a piling laminate using inorganic powder to form a coating on the surface of a laminate such as coal, coke, iron ore, sand and wood powder, which is deposited outdoors. It is an object of the present invention to provide a treatment agent for coating a layered laminate using inorganic powder which does not adversely affect the lamination during the subsequent process.

The present invention for achieving the above object is an emulsion polymerization in which the powder solution obtained by dispersing an inorganic powder having an average particle diameter of 50 μm or less in 30 wt% or less, and a dispersion concentration of the polymer resin in a range of 5-50 wt% with respect to water. The present invention relates to a treatment agent for coating a wild object laminate using an inorganic powder, wherein the glass transition temperature is composed of a polymer resin emulsion solution having a range of 0-60 ° C.

Description

Treatment agent for coating of pile laminate using inorganic powder

1 is a photograph of the case where the coating treatment agent consisting of a resin emulsion solution is sprayed onto coal.

2 is a photograph of the case where the coating treatment agent consisting of the powder solution of the present invention and the polymer resin emulsion solution is sprayed onto coal.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a treatment agent for coating a piling laminate using inorganic powder, which forms a coating on the surface of a laminate such as coal, coke, iron ore, sand, and wood flour, which is deposited outdoors. The present invention relates to a coating treatment agent and a coating method using the same to form a film to prevent dust generation by wind, waterproofing, oxidation by air, and leakage and collapse by rainfall.

Generally, coal, coke, and wood powder are piled up and stored in steel mills, thermal power plants, briquettes, and paper mills. By the way, such storage generates a large amount of dust by wind during storage, causing dust pollution in the surrounding area, and causing loss of storage, and also during the rainfall, it may flow into the river or the sea and pollute the water. do. And when the moisture content in the laminate of coal, coke, iron ore is increased, there is a side effect that the loss caused by the heat of evaporation of water. For example, the amount of heat lost by increasing the water content by 1% in 1 ton of coal is about 5,300 kPa, resulting in large economic losses.

Many proposals have been made as a coating agent for coating a laminate to solve such disadvantages, and examples thereof include Japanese Patent Laid-Open Nos. 62-146804, 2-137753 and 58-109557. .

Japanese Patent Laid-Open Nos. 62-146804 and 2-137753 among the above-mentioned conventional known techniques are applied by spraying an emulsion latex such as SBR (styrene-butadiene rubber), polyvinyl acetate and polyacrylic acid on the surface of the laminate. A method of forming a film, and the method of JP-A-58-109557 is a method of spraying cement milk and polymer resin on a laminate. However, the resin film using the emulsion latex of Japanese Patent Laid-Open Nos. 62-146804 and 2-137753 among the above methods is expected to have some effect in preventing dust generation, but it prevents the collapse of the laminate due to heavy rain or rainfall. There is an inadequate disadvantage in preventing the penetration of water.

And the method of spraying cement milk and polymer resin of Japanese Patent Application Laid-Open No. 58-109557 is that when coke is manufactured from coal with cement component as a raw material, the quality of coke decreases or damages the furnace wall. There is.

Accordingly, the present inventors have conducted research and experiments to solve the above problems, suggesting the present invention in view of the following facts.

In the present invention, an emulsion solution of a polymer resin and a powder solution obtained by dispersing an inorganic powder in water are used to form a treatment agent for the coating of a wild animal laminate to actively use the characteristics of the polymer resin solution and the powder solution. That is, the characteristics of the powder solution for effectively reducing the voids on the surface of the laminate and the polymer resins, particularly vinyl acetate and acrylic resins or their co-polymers, which form a weather resistant film are used.

An object of the present invention is to provide a treatment agent for coating a pirated laminate using inorganic powder, which maintains the stable laminate for a long time and does not adversely affect when the laminate is used in a later step.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated.

The present invention is a powder solution obtained by dispersing at least one inorganic powder selected from limestone, slaked lime and gypsum having an average particle diameter of 50 μm or less to 30% by weight or less, and the dispersion concentration of the polymer resin 5-50% by weight with respect to water. Emulsified and polymerized so that the glass transition temperature is in the range of 0-60 ℃, and the powder solution and the polymer resin solution are mixed with inorganic powder in a 1: 9 to 9: 1 weight ratio. It relates to a treating agent for coating a laminate.

Hereinafter, the present invention will be described in more detail.

The powder solution used in the coating treatment agent of the present invention preferably uses a solution in which an inorganic powder having an average particle diameter of 50 μm or less is mixed at 30% by weight or less, for the following reason. In this case, it is preferable to use one or two or more selected from limestone (CaCO ₃ ), calcined lime (Ca (OH) ₂ ) and gypsum (CaSO ₄ ).

If the particle size of the inorganic powder is 50 µm or more, it is difficult to mechanically spray the stratum laminate, and even when sprayed on the stratum laminate, the inorganic powder does not sufficiently enter the pores between the particles of the surface layer of the laminate, thereby hardening the surface layer of the laminate. This is because there is a problem that can not be fixed.

If the mixing amount of the inorganic powder contained in the powder solution is 30% by weight or more with respect to water, the fluidity of the powder solution is lowered and it is difficult to mechanically spray the fermentation laminate. It is more preferable than 10-20 weight% with respect to water.

On the other hand, in the present invention, the surface tension of the powder may not be well dispersed in water. In this case, the solution can be solved by adding a surfactant.

Meanwhile, the polymer resin emulsion solution, which is another component of the coating treatment agent of the present invention, is a resin solution prepared by emulsion polymerization of a polymer resin, and its glass transition temperature (Tg) is in the range of 0-60 ° C., and the dispersion of the polymer resin in the solution. The concentration is preferably in the range of 5-50% by weight with respect to water, for the following reason.

If the glass transition temperature is lower than 0 ° C, the strength of the resin film formed on the surface of the lamella laminate is weak, which may cause various problems in physical properties. If the glass transition temperature is higher than 60 ° C, the resin film shrinks and the hard film properties may be affected. This is because cracking is likely to occur.

In addition, when the polymer resin emulsion solution is mixed with the powder solution and sprayed onto the laminate, fluidity is required such that the spray solution does not flow down the inclined surface of the laminate. The factor affecting this is the dispersion concentration of the polymer resin. to be. The dispersion concentration of the polymer resin varies depending on the type of polymer resin used, the type of emulsifier and the solvent. When the concentration is 5% by weight or less with respect to water, the thickness of the surface treatment agent film is reduced due to the small amount of solid content of the polymer resin. The thin film may not exhibit sufficient performance, and if it is 50% by weight or more, the storage stability of the polymer resin emulsion solution may deteriorate, and the workability may deteriorate when it is sprayed onto the laminate. It is preferable to limit the amount to 5-50% by weight.

At this time, as the polymer resin, vinyl acetate, vinyl chloride, acrylate (for example, methyl acrylate, ethyl acrylate, propyl acrylate and butyl acrylate, etc.), methacrylate (for example, methyl methacrylate, One selected from the group consisting of ethyl methacrylate, propyl methacrylate, butyl methacrylate and 2-ethylhexyl methacrylate), styrene, butadiene, butyl rubber, neoprene rubber, nitrile rubber and copolymers thereof; or It is preferable to use 2 or more types, More preferably, acrylic resin or the copolymer of acrylic resin and another resin may be excellent in weatherability and flexibility.

In the present invention, the polymer resin emulsion solution is prepared by dispersing the polymer resin as described above in water together with an emulsifier such as a surfactant, or in water with a solvent compatible with the polymer resin. . The polymer resin emulsion solution exhibits good properties for the film formation of the laminate of the present invention as a copolymer of vinyl acetate and acrylate (solid content 42%, 70 cps, pH 5.7), and has a glass transition temperature of 0-60 ° C. One example is the range.

In the present invention, the mixing ratio between the powder solution and the polymer resin emulsion solution is not particularly limited. However, in order to obtain the desired effect in the present invention, one component of the two solutions may be at least 10% or more. It is preferable to.

On the other hand, as a method of spraying the coating treatment agent composition as described above, the powder solution and the polymer resin emulsion solution is separated and stored and mixed immediately before use to spray on the surface of the laminate, the powder solution and polymer resin emulsion solution spraying device A method of spraying at the same time from different nozzles, a method of spraying the powder solution and the polymer resin emulsion solution with a predetermined time difference and the like have been proposed. Each of these spreading methods may show some difference in the strength and weather resistance of the film formed on the surface of the laminate. However, these methods may be appropriately selected depending on the state of the laminate, powder solution, polymer resin emulsion solution, spraying conditions and the like.

For example, in the case where the powder solution and the polymer resin emulsion solution are mixed just before spraying and sprayed on the laminate, and when the powder solution and the polymer resin emulsion solution are simultaneously sprayed from different nozzles, the laminate and the powder component on the surface of the laminate. The resin component is integrally fixed to form a firm film.

In addition, when the powder solution and the polymer resin emulsion solution are sprayed on the surface of the laminate with a predetermined time difference, the film is formed into two layers by the film by the powder solution and the film by the polymer resin emulsion solution. In this case, since the crack is generated in the film by the powder solution and the resin component can penetrate the cracked portion, it is more preferable to spray the powder solution first and then spray the polymer resin emulsion solution to form the film.

In the spraying method of the present invention, it is preferable to spray the coating treatment agent at a spraying amount of 0.5-6 kg / m 2, and more preferably at a spraying amount of 1-4 kg / m 2, on the surface of the field stack. If the spraying amount is less than 0.5 kg / m 2, the surface of the piled layer may not be sufficiently sprayed. If the spraying amount is more than 6 kg / m 2, the moisture content of the laminated surface layer may increase, resulting in fluidization, cracking on the surface, and collapse. do.

When the coating treatment agent of the present invention is sprayed on a small stack, there is a method of spraying manually using a portable spreader.In the case of a large stack that is difficult to handle manually, the powder solution and the polymer resin emulsion solution are stored inside. It can be handled automatically by sprinkler wheels. Thus, it is good to spread | spray in a suitable method according to the magnitude | size of a laminated body.

In the case where the coal deposit is coal, the coating film formed by spraying the coating treatment agent of the resin emulsion solution and the coating treatment agent composed of the polymer resin emulsion solution and the powder solution of the present invention is shown in FIGS. 1 and 2. .

In FIG. 1, the transparent resin emulsion solution penetrated between the particles of the laminate did not confirm the appearance of the coating formed on the surface layer of the laminate. However, the coating treatment agent of the present invention shown in FIG. 2 has good isotropy. The penetration of is suppressed, and a continuous film is formed on the surface of the laminate, and a film in which the laminate and the powder component are integrally fixed by the polymer resin is formed. Since this film is extremely stable and dense without holes, it is possible to prevent the laminate from leaking out and collapsing due to rainfall, even after a long time. In addition, since the air is not introduced into the laminate by the film, the laminate prevents aging and spontaneous ignition in case of coal, and the water content of the laminate does not evaporate because precipitation and internal moisture do not occur. There is no change. In addition, since a stable film is formed on the surface of the laminate, dust pollution is not generated by wind. In addition, even when the laminate is used in a post-process, it can be effectively used for coal laminates because it does not generate contamination regardless of the intended use.

Hereinafter, the present invention will be described in more detail with reference to Examples, which do not limit the present invention.

Example 1

100 g of coal was placed in a 145 mm diameter chalet and sprayed with 1.0 L / m 2 of the coating treatment agent of Inventive Example (1-10) and Comparative Example (1-5) prepared on the surface under the conditions described below. It was. After one day, the prepared sample was placed on a test bench tilted at an angle of 45 °, and the rainfall tester was sprinkled at a rate of 1,000 mm / Hr for 2 hours at a height of 45 cm to observe the change of the coal sample. The moisture on the surface was completely dried and weighed. The rain resistance and the touch strength of the coal samples thus prepared were measured and the results are shown in Table 1 below.

At this time, the rain resistance of the coal sample was evaluated by the flow rate (%) as shown in the following equation, the contact strength was evaluated by the strength when the sample was pressed with a finger after completely drying the moisture on the surface of the coal sample. The order of the contact strength is in the order of >

Invention Example 1

A vinylacetate-acrylic copolymer (10% by weight) emulsion solution and a slaked lime [Ca (OH) ₂ ] solution (10% by weight) having an average particle diameter of 13.2 μm were mixed at 10:90 to spray 1.0 L / m 2.

Invention Example 2

A vinylacetate-acrylic copolymer (10% by weight) emulsion solution and a slaked lime [Ca (OH) ₂ ] solution (10% by weight) having an average particle diameter of 13.2 µm were mixed at 30:70 to spray 1.0 L / m 2.

Invention Example 3

A vinylacetate-acrylic copolymer (10% by weight) emulsion solution and a slaked lime [Ca (OH) ₂ ] solution (10% by weight) having an average particle diameter of 13.2 µm were mixed at 50:50 to spray 1.0 L / m 2.

Invention Example 4

A vinylacetate-acrylic copolymer (10% by weight) emulsion solution and a slaked lime [Ca (OH) ₂ ] solution (10% by weight) having an average particle diameter of 13.2 µm were mixed at 70:30 and sprayed at 1.0 l / m 2.

Invention Example 5

A vinylacetate-acrylic copolymer (10% by weight) emulsion solution and a slaked lime [Ca (OH) ₂ ] solution (10% by weight) having an average particle diameter of 13.2 µm were mixed at 90:10 to spray 1.0 L / m 2.

Invention Example 6

The vinylacetate-acrylic copolymer (10% by weight) emulsion solution and the limestone (CaCO ₃ ) slurry solution (10% by weight) having an average particle size of 1.3 μm were mixed at 10:90 to spray 1.0 L / m 2.

Invention Example 7

A vinylacetate-acrylic copolymer (10 wt%) emulsion solution and a limestone (CaCO ₃ ) slurry solution (10 wt%) having an average particle size of 1.3 μm were mixed at 30:70 and sprayed at 1.0 L / m2.

Inventive Example 8

A vinylacetate-acrylic copolymer (10% by weight) emulsion solution and a limestone (CaCO ₃ ) slurry solution (10% by weight) having an average particle size of 1.3 μm were mixed at 50:50 to spray 1.0 L / m 2.

Invention Example 9

A vinylacetate-acrylic copolymer (10% by weight) emulsion solution and a limestone (CaCO ₃ ) slurry solution (10% by weight) having an average particle size of 1.3 μm were mixed at 70:30 to spray 1.0 L / m 2.

Invention Example 10

The vinylacetate-acrylic copolymer (10% by weight) emulsion solution and the limestone (CaCO ₃ ) slurry solution (10% by weight) having an average particle size of 1.3 μm were mixed at 90:10 to spray 1.0 L / m 2.

Comparative Example 1

Ethyl acrylate (10 wt%) emulsion solution [glass transition temperature; -5 [deg.] C. was sprayed at 1.0 l / m < 2 >.

Comparative Example 2

Methyl methacrylate (10 weight%) emulsion solution [glass transition temperature; 124 ° C.] was sprayed at 1.0 L / m 2.

Comparative Example 3

1.0 L / m <2> spraying of the slaked lime [Ca (OH) ₂ ] solution (10 weight%) whose average particle diameter is 13.2 micrometers.

[Comparative Example 4]

1.3㎛ average particle diameter of the limestone (CaCO ₃₎ slurry 1.0ℓ / ㎡ spraying (10% by weight).

[Comparative Example 5]

1.0 L / m <2> sparging of the vinyl acetate-acrylic copolymer (3 wt%) emulsion solution.

TABLE 1

As can be seen in Table 1, in the case of Inventive Example (1-10), which satisfies the scope of the present invention, the outflow rate is low and the contact strength is also excellent, while the comparative example does not satisfy the scope of the present invention ( In the case of 1-5), it can be seen that the outflow rate is higher and the touch strength is also lower than that of the above-described invention example.

Example 2

After making a conical coal pile (about 2 tons / pile) having a base diameter of 3M and a height of 1.2M, the surface was sprayed with a coating agent of Inventive Example (11-12) and Comparative Example (6-7) under the conditions described below. After drying for a day to form a film, the rain tester is controlled on the center of the conical pile, and then artificial rain falls at a speed of 200 mm / Hr or more at 3M height so that the coating agent is formed on the surface of the coal pile. The time and the touch strength at which the film breaks and collapses are measured and the results are shown in Table 2 below.

At this time, the contact strength was measured by the strength when pressing the film formed on the surface of the pile with a finger, the order is the same as in the case of Example 1.

Invention Example 11

A vinyl acetate-acrylic copolymer emulsion solution (10 wt% solids) and a gypsum (CaSO ₄ ) solution (10 wt%) having an average particle diameter of 13.2 μm were mixed at 50:50 and sprayed at 4.0 L / m 2.

Invention Example 12

The vinylacetate-acrylic copolymer emulsion solution (10 wt% solids) and the limestone (CaCO ₃ ) slurry solution (10 wt%) having an average particle size of 1.3 µm were mixed at 50:50 and sprayed at 4.0 L / m2.

Comparative Example 6

2.0 L / m <2> of the vinyl acetate-acrylic copolymer emulsion solution (10 weight%) was sprayed.

Comparative Example 7

4.0 L / m <2> of the vinyl acetate-acrylic copolymer emulsion solution was sprayed.

TABLE 2

As can be seen in Table 2, in the case of the invention examples (11, 12) satisfying the scope of the present invention, while the start time of the collapse and also excellent in the contact strength, the comparison does not satisfy the scope of the present invention In the case of the examples (6, 7) it can be seen that the collapse start time is short and the contact strength is also lower than in the case of the invention example described above.

As described above, the present invention is to form a coating treatment agent in the powder solution of the inorganic powder and the emulsion solution of the polymer resin, so that the inorganic laminate is stable for a long time and does not adversely affect when the laminate is used in a later process There is an effect that can provide a treatment agent for the coating of the pidal laminate using.

Claims (4)

The powder solution obtained by dispersing at least one inorganic powder selected from limestone, calcined lime and gypsum having an average particle diameter of 50 µm or less to 30% by weight or less, and the dispersion concentration of the polymer resin in the range of 5-50% by weight with respect to water Emulsified and polymerized so that the glass transition temperature is in the range of 0-60 ° C., and the powder solution and the polymer resin emulsion solution are 1: 9 to 9: 1 weight ratio mixed with inorganic powder. Water treatment agent. The treatment agent for coating the stacked object using the inorganic powder according to claim 1, wherein the inorganic powder is dispersed in a range of 10-20% by weight with respect to water. According to claim 1, wherein the polymer resin is selected from the group consisting of vinyl acetate, vinyl chloride, acrylate, methacrylate, styrene, butadiene, butyl rubber, neoprene rubber, nitrile rubber and copolymers thereof The surface treating agent of the field stacks using inorganic powder characterized by the above. 4. The surface treating agent of the field laminate using inorganic powders according to claim 3, wherein the polymer resin is a copolymer of vinyl acetate and acrylate.