KR102338342B1 - Dry-ice blast method - Google Patents

Abstract

According to the present invention, a dry-ice blasting method comprises: a pellet feeding step of feeding dry-ice pellets, obtained by pulverizing dry ice, into a hopper; a mixing step of feeding a heat blocking agent, including at least one of wollastonite and an acrylic resin, into the hopper and mixing the heat blocking agent with the pellets; a compressed-air injection step of preparing a propellant by mixing compressed air in the hopper; and a spraying step of spraying the propellant on a target surface. The dry-ice blasting method can mix the heat blocking agent, including the at least one of the wollastonite and the acrylic resin, with the dry-ice pellets and spray the mixture together with the compressed air to cause the heat blocking agent to provide moisture absorption, heat insulation, and heat blocking functions, thereby preventing clogging of a spray nozzle or a supply pipe, provided in a blasting device, due to condensation of moisture in the air.

Description

Dry ice blast method {DRY-ICE BLAST METHOD}

The present invention relates to a dry ice blasting method, and more specifically, a dry ice blasting method in which a heat shield is mixed and sprayed with dry ice pellets to prevent the nozzles from clogging due to freezing of moisture in the air during the blasting operation. It is about the ice blast method.

As a means to increase the durability of road transportation facilities, ships, automobiles, heavy equipment piping, and other mechanical and architectural structures, paint is applied to the surface to form a coating film. The purpose is abrasion resistance, slip resistance, and weather resistance (耐候性) is applied as a method to protect the interior by having character.

Painting materials include paint, varnish, lacquer, lacquer, etc. In general, painting methods include primary, chaebol, and subjugation methods. The surface of the coating film is partially peeled off due to adhesion, requiring repainting.

For repainting, the surface must be clean and clean for reuse of conventionally painted ones. A method of cleaning the surface is suggested by introducing the blasting technique, which is a widely used technique as one of the surface polishing methods. has been widely used.

A typical abrasive material for such a blasting technique is sand or a metal ball, and often, a blasting process using sand is called a sand blasting process. In this sand blasting process, sand particles are projected onto the object to be processed at high speed to polish the surface or, in some cases, to form irregularities on the surface for better painting.

Furthermore, in such a blasting technology, a dry cleaning method using sublimable solid particles typified by dry ice has recently been introduced, and a technology for cleaning the surface of the object to be cleaned without defects is used.

As a prior art to this, Korean Patent Registration No. 10-1967115 discloses a 'dry ice particle spray cleaning device'.

The present invention relates to a dry ice particle spraying cleaning apparatus that improves dry ice cleaning characteristics, is manufactured simply, and has a flexible nozzle structure, comprising: a dry ice supply unit and a carrier gas supply unit that are integrated to form a single body; The dry ice supply unit includes an inner nozzle coupled to the outer nozzle in an interference fit manner, the end of the outer nozzle coincides with the end of the dry ice supply unit, and the first depth at which the inner nozzle is inserted into the outer nozzle is formed in the outer nozzle It is adjusted to define an expansion space.

However, in the case of the dry ice particle spray cleaning apparatus as described above, there may be problems such as clogging of the nozzle due to freezing of moisture in the air when spraying dry ice. The problem was that it was impossible.

Therefore, in order to solve the above-mentioned problems, there is a need to develop a dry ice blasting method that enables continuous spraying of dry ice by preventing nozzle clogging due to moisture freezing that may occur at the inlet of the spray nozzle. to be.

The main purpose of the present invention is to provide a dry ice blasting method in which, in a blasting method for performing a cleaning operation by spraying dry ice pellets, moisture near the entrance of the injection nozzle is frozen and the injection nozzle is prevented from clogging. do.

Another object of the present invention is to ensure cleanliness in the vicinity of the target surface by adding a suction configuration for dirt generated by the cleaning operation.

Another object of the present invention is to provide a configuration for adjusting the diameter of the dry ice pellets to increase the cleaning performance.

It is a further object of the present invention to provide a step-by-step spraying process capable of maximizing cleaning performance.

In order to achieve the above object, a dry ice blasting method according to the present invention includes a pellet input step of putting dry ice pellets in which dry ice is pulverized into a hopper; a mixing step of adding a heat shielding agent containing at least one of wollastonite and an acrylic resin to the hopper and then mixing with the pellets; Compressed air injection step of mixing the compressed air in the hopper to prepare a propellant; and a spraying step of spraying the propellant on the target surface.

Furthermore, after the spraying step, a suction step of sucking the dirt generated on the target surface; characterized in that it is included.

In addition, the dry ice pellets are fed into the hopper through a first supply pipe connecting the pellet molding machine and the hopper, and the heat shielding agent is provided through a second supply pipe connecting the heat shielding agent supply device and the hopper. input to the hopper, the compressed air is input to the hopper through a third supply pipe connecting the air compressor and the hopper, and the propellant is fed through a fourth supply pipe connecting the hopper and the injection nozzle. It is provided in the spray nozzle and sprayed on the target surface, wherein at least one of the first supply pipe and the fourth supply pipe is provided along the circumference of at least one of the outer circumferential surface and the inner circumferential surface, and includes a heating string made of a hot wire characterized.

In addition, before the spraying step, the surface of the target surface is processed to form an unevenness forming step to form the unevenness on the target surface; including, the spraying step, the propellant at a pressure of 10 to 20 bar and 150 to 250 A primary injection step of first spraying the target surface at a speed of m/s, and a secondary injection step of secondarily spraying the propellant to the target surface at a pressure of 15 to 30 bar and a speed of 200 to 400 m/s It is characterized in that it includes.

Dry ice blasting method according to the present invention,

1) A heat shield containing at least one of wollastonite and acrylic resin is mixed with dry ice pellets and sprayed together with compressed air, so that the heat shield provides moisture absorption, heat insulation, and heat shielding functions and is provided in the blasting device to prevent clogging of the spray nozzle or supply pipe due to condensation of moisture in the air,

2) By including a process for sucking in the dirt generated during the cleaning process, it is possible to maintain the cleanliness of the target surface and prevent the dirt from scattering in the air.

3) By adjusting the diameter of dry ice pellets differently, the cleaning performance of the target surface can be improved, and at the same time,

4) It provides the effect of maximizing the cleaning power by forming irregularities on the surface of the target surface before spraying and spraying the propellant at different pressures and speeds.

1 is a conceptual diagram showing a schematic configuration of a dry ice blasting device.
Figure 2 is a block diagram of the blasting device.
Figure 3 is a flow chart showing the blast method.
Figure 4 is a conceptual diagram showing the configuration of the blasting device including the inhaler of the present invention.
5 is a flowchart illustrating a step of manufacturing a heat-insulating strengthening agent.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings are not drawn to scale, and like reference numbers in each drawing refer to like elements.

1 is a conceptual diagram illustrating a schematic configuration of a dry ice blasting apparatus, and FIG. 2 is a block diagram of the blasting apparatus.

1 to 2 , the dry ice blasting apparatus of the present invention may preferably include a hopper 10 , an air compressor 20 , a supply pipe 30 , and a spray nozzle 50 .

The hopper 10 performs a function of uniformly mixing dry ice pellets formed of dry sublimable materials such as dry ice into fine particles.

In the present invention, the spraying material sprayed on the target surface 200 is based on a dry sublimable material that does not leave any residue, and the sublimable material used here is based on dry ice pellets.

The pellet (pellet) refers to a powder in the form of 0.1 to 5 mm, or smaller or larger than this, and as mentioned above, in the present invention, the pellet may be formed of a powder formed into fine particles for the above-mentioned dry ice.

In the present invention, a pellet molding machine 300 for molding dry ice into particulate form may be included, and the pellet molding machine 300 accommodates dry ice in the form of blocks or lumps of a specific size in a chamber, then hydraulic cylinders and pistons It provides a function of completing the pellets through a plurality of holes formed in the chamber by providing pressure to the chamber through a compression means, such as. Since this pellet molding machine 300 can apply a known pellet molding apparatus, a separate additional description will be omitted.

The hopper 10 of the present invention has a cylindrical or inverted cone shape, in a state with an inlet 11 capable of putting the molded pellets in, and a door (not shown) for opening and closing the inlet 11 at the top. Consists of any one of the truncated cone shapes

In particular, referring to FIG. 1 , the hopper 10 has a funnel-shaped lower transfer body 12 installed on one side of the inner space in a state of a cylindrical shape having an inner space, and a rotating plate 13 and a plurality of It is possible to include a scraper.

The rotating plate 13 is installed on the lower or upper part of the lower transport body 12 to provide a function of rotation, and the rotating plate 13 has a rotating shaft 14 on the lower transport body 12 to stand up toward the upper direction. A plurality of rotating scrapers 15 may be installed in an extended state as a bar shape radially around the outer circumferential surface of the rotating shaft 14 or the rotating plate 13 itself.

This rotary scraper 15 scrapes dry ice located on the inner inclined surface of the lower conveying body 12, that is, pellets, as well as to prevent the dry ice from coagulating or remaining in the lower conveying member 12, as well as scraping the lower conveying member 12. ) to evenly mix the concentrated pellets. In order to supplement this function, it is also possible that a plurality of spikes are installed on the bottom of the rotary scraper 12 .

Additionally, it is also possible that the hopper 10 includes an auxiliary scraper 16 and a fixed scraper 17 .

The auxiliary scraper 16 is a member connecting the ends of the rotary scraper 15 described above, and a plurality of spikes may also be formed on the bottom surface, through which the pellets are driven or biased toward the end of the rotary scraper 15. Provides the ability to scratch or spread evenly.

Alternatively, the auxiliary scraper 16 may be connected to the outer peripheral surface of the rotating shaft 14 or the rotating plate 13 in an extended structure separate from the rotating scraper 15 .

The fixed scraper 17 is fixedly installed around the lower end of the hopper 10 or the start end of the supply pipe 30 to provide a role to prevent solidification or agglomeration of the pellets, for example, may be formed of a plurality of protrusion structures. .

The rotary shaft 14 for rotating the above-described rotary scraper 15 and auxiliary scraper 16 is rotationally driven by a reduction motor 18 installed at the lower end of the hopper 10 .

The reduction motor 18 rotates the rotating plate 13 or the rotating shaft 14 while simultaneously rotating the rotating scraper 15 and the auxiliary scraper 16, as well as controlling the supply amount of pellets supplied to the supply pipe to be described later and simultaneously compressing Of course, it is possible to perform a function of controlling the precise rotation speed and number of rotations of the rotating shaft so that it can be properly mixed with air at a preset ratio.

The air compressor 20, that is, the air compressor (air compressor) compresses and generates air, stores it at sufficient pneumatic pressure, and supplies it to the pellets of the hopper 10 through the supply pipe 30 to provide the jetting force of the pellets as a result. perform the function

1 illustrates that the air compressor 20 is mounted on the case 100 , the air compressor 20 may be mounted on the case 100 together or separately disposed. Since the air compressor 20 is the same as a known air compressor, a separate description thereof is also omitted.

That is, in the present invention, the supply amount of dry ice, that is, pellets is determined by the rotation speed of the above-described reduction motor 18, and the flow rate of compressed air is determined by the injection force of the air compressor 20 or the inner diameter of the supply pipe 30. In other words, by changing the rotation speed of the deceleration motor 18 and selectively using the supply pipe 30 having various inner diameters or the air compressor 20 providing various injection forces, the injection amount of dry ice can be appropriately adjusted.

In addition, the blasting device of the present invention is a supply pipe 30 that can receive a propellant mixed with dry ice pellets, compressed air, and a heat shield from the hopper 10, and the pellets and compressed air supplied to the supply pipe 30, heat shielding It basically includes a spray nozzle 50 for spraying the mixed propellant on the target surface.

On one side of the supply pipe 30 around the injection nozzle 50, a handle 51 may be formed so that an operator can easily grip the supply pipe 30, and the injection force of pellets and compressed air around the handle 51 A safety valve 52 having a function of temporarily opening/closing the supply pipe 30 by operating by the operator's hand movements to temporarily block the valve may be installed. It is possible that the handle 51 and the safety valve 52 are simultaneously included in one unit.

In addition, the dry ice blasting apparatus may include a controller 70 , the controller 70 serves to control the rotary plate of the hopper 10 and compressed air injection of the air compressor 20 .

Also, as can be seen from FIG. 2 , the blasting device of the present invention may include a heat shielding agent supply device 400 , which stores the heat shielding agent input into the hopper 10 , and supplies the heat shielding agent to the hopper 10 . This is an input and mixing device, and the heat shielding agent, as will be described later, may be molded into a granular pellet type and have a diameter similar to that of dry ice pellets.

In addition, in the above description, the supply pipe 30 was referred to as a pipe having a function of supplying the propellant, but as can be seen in FIG. 2 , in the case of the supply pipe 30 , the air compressor 20 , the pellet molding machine 300 , and the car Dry ice pellets, compressed air, and a heat shield may be provided inside the hopper 10 through the supply pipe 30 connected to each from the heat agent supply device 400, and the hopper 10 and the spray nozzle 50 Also, the supply pipe 30 may be connected and the propellant may be sprayed to the outside from the injection nozzle 50 via the supply pipe 30 .

At this time, the supply pipe 30 is further subdivided, the first supply pipe 31 for supplying dry ice pellets from the pellet forming machine 300 to the hopper 10, and compressed air from the air compressor 20 to the hopper 10. The second supply pipe 32, the third supply pipe 33 for supplying the heat shield from the heat shield supply device 400 to the hopper 10, and the inside of the hopper 10, dry ice pellets, heat shield, and compressed air are mixed It may be formed of a fourth supply pipe 34 for supplying the manufactured propellant to the spray nozzle 50 .

At this time, as described above, when the propellant mixed with the heat shielding agent is provided through the supply pipe 30 , moisture in the air near the supply pipe 30 condenses and freezes near the supply pipe 30 , or the supply pipe 30 ) There may be problems with blocking the inside.

Therefore, in order to prevent this problem, a heating string, that is, a heating wire, may be provided in at least one of the first supply pipe 31 and the fourth supply pipe 34 in which the cooling problem due to the dry ice pellets is prominent.

Such a heating string is provided along the outer peripheral surface or the inner peripheral surface of the first supply pipe 31 and the fourth supply pipe 34, preferably, it may be provided along all the perimeters of the outer peripheral surface and the inner peripheral surface.

Furthermore, in the case of the heating string, it is also possible to provide at least only the fourth supply pipe 34, that is, only around the pipe connecting the hopper 10 and the spray nozzle 50, but most preferably, dry ice pellets are used in the hopper ( 10) may be provided in both the first supply pipe 31 and the fourth supply pipe 34 for connecting the hopper 10 and the injection nozzle 50 for processing.

In addition, since it is said that the heating string is made of a hot wire, a separate power source is provided, and the first supply pipe 31 and the fourth supply pipe 34 are included by allowing the heating string including the heating wire to be heated through the power source. It goes without saying that the supply pipe 30 should be heat-treated, and for this purpose, a conventional exothermic material or a heating element must be included.

The dry ice blasting method of the present invention having such a structure will be described as follows.

3 is a flowchart showing the blast method.

Referring to FIG. 3 , the dry ice blasting method of the present invention may largely include a pellet input step (S1), a mixing step (S2), a compressed air injection step (S3), and a spraying step (S4).

(S1) pellet input step

First, dry ice pellets in which the dry ice has been pulverized are put into the hopper 10 . Therefore, as described above, the dry ice pellets can be input and filled into the hopper 10 through the inlet 11 provided in the hopper 10 as a medium.

(S2) mixing step

Next, the heat shielding agent is put into the hopper 10 and mixed with the pellets. Here, the heat shielding agent is characterized by including at least one of wollastonite and an acrylic resin as being excellent in heat shielding performance and heat insulating performance.

In general, when the dry ice pellets are sprayed through the spray nozzle 50, the inlet of the spray nozzle 50 may be blocked if moisture in the air condenses and freezes near the inlet to the spray nozzle 50. .

At this time, if the heat shielding agent is mixed with the pellets and sprayed, the inlet of the spray nozzle 50 can be prevented from being blocked by the heat shielding effect through the heat shielding agent, or dry ice can be solidified at any part of the supply pipe 30 or Alternatively, moisture in the air may be condensed to help solve the clogging of the supply pipe 30 .

Such a heat shielding agent preferably includes at least one of wollastonite and acrylic resin, wherein the acrylic resin can be said to be a basic material that becomes the base of an aqueous heat insulating material, and wollastonite is composed of calcium, iron, and manganese, also called wollastonite. It is a cyclosilicate and includes both α-wollastonite and β-wollastonite. Such wollastonite has excellent thermal insulation and heat shielding properties.

Therefore, preferably, wollastonite powder is added as a heat shield, or an acrylic resin is mixed with wollastonite, and a pellet-shaped mixture in which a mixture of wollastonite and acrylic resin is solidified is added to the hopper 10 also. It is possible.

In addition, in this case, the mixing ratio of the acrylic resin and the wollastonite is not limited, but preferably 40 to 70 parts by weight of the acrylic resin and 30 to 60 parts by weight of the wollastonite are mixed to dry the mixed composition, This may be molded into a pellet shape having a size similar to that of the dry ice pellets described above, and a pellet-type heat shielding agent may be added to the hopper 10 .

Furthermore, there is no limitation in the amount of the heat shielding agent added, but preferably, in the mixing of the dry ice pellets and the heat shielding agent, the weight ratio of the dry ice pellets to the heat shielding agent is 1:1 to 5:1. . In order to improve the heat shielding performance, the specific gravity of the heat shielding agent may be increased, and in order to improve the cleaning property, the weight ratio of the dry ice pellets may be increased. However, in order to prevent deterioration of the cleaning ability, it may be preferable that the heat shielding agent is not added to an extent exceeding the weight of the dry ice pellets.

(S3) compressed air injection step

Next, compressed air is mixed in the hopper 10 to prepare dry ice pellets, a heat shield, and a propellant in which compressed air is mixed.

To this end, the air compressor 20, which is a type of air compressor, compresses and generates air, stores it at sufficient pneumatic pressure, and then injects it into the hopper 10 through the supply pipe 30 as a medium, so that the inside of the hopper 10 Make sure that compressed air is mixed with the filled dry ice pellets and heat shield.

Here, the mixing amount of the air compressor can be adjusted according to the desired injection pressure level in performing dry ice blasting, and as the mixing amount of compressed air increases, the injection pressure increases, so that the dry ice pellets and the heat shield are more strongly applied to the target surface 200 . can be sprayed on In addition, the mixing amount of compressed air may be adjustable according to the spraying force desired by the operator, and it is based on not placing a separate limitation on this.

(S4) injection step

Finally, dry ice blasting is performed by spraying the propellant on the target surface 200 . Therefore, the dry ice pellets with sublimation properties contained in the propellant peel off the paint on the target surface 200 or remove foreign substances. (30) It becomes possible to solve the problem of freezing. In addition, since the heat shielding agent is also characterized in that it is granular, it goes without saying that the cleaning effect on the target surface 200 may be higher according to the addition of the heat shielding agent.

Therefore, through such a blast method, a high level of cleaning power for the target surface 200 can be provided, but the supply pipe 30 is frozen through the addition of a heat shield or the water in the air is condensed by the spray nozzle 50 This clogging problem can be solved.

4 is a conceptual diagram illustrating the configuration of a blasting device including the inhaler of the present invention.

Referring to FIG. 4 , the blasting apparatus of the present invention may include a waste suction device 60 and a suction pipe 40 through which waste generated on the target surface 200 is sucked.

In addition, although a separate nozzle may be additionally provided to suck the dirt, more preferably, the spray nozzle 50 may be configured to have a suction function for dirt. At this time, the suction pipe 40 may be branched at one point of the supply pipe 30 , that is, a branching area, and connected to the suction motor 61 of the foreign material suction unit 60 , and the on/off valve 45 is mounted in this branching area. It is possible to provide In this case, it is also possible to have the supply pipe 30 also serve as a supply path for the propellant and a suction path for foreign substances sucked from the injection nozzle 50 .

In other words, the pipe and nozzle structures for supplying the propellant and the pipe and nozzle structures for discharging the dirt sucked from the target surface 200 may be independently configured, but as described above, a structure that can share suction and discharge This means that you can present

Therefore, a suction pipe 40 for connecting the waste suction unit 60 and the supply pipe 30 is provided, and the supply pipe 30 is used for both suction and injection in the part connected to the spray nozzle 50, and the on/off valve 45 ) may be configured such that the supply pipe 30 and the suction pipe 40 are branched through the medium.

In this case, when spraying the propellant, the on/off valve 45 should be controlled to close the suction pipe 40, which is also connected to the hopper 10 by applying the bidirectional opening/closing control function of the on/off valve 45. By opening a part of the supply pipe 30, it is possible to ensure the smooth supply of the propellant. Conversely, it goes without saying that the supply pipe 30 branched through the opening/closing valve 45 must be closed when the waste is sucked.

According to the structure in which the pipeline and the nozzle are partially shared as described above, it is possible to prevent the problem that the inside of the supply pipe 30 is frozen with dry ice due to the suction power of the suctioned dirt, as well as the supply pipe 30 to several tens of meters according to the construction environment. When it is extended for a long time, it is possible to provide a characteristic that can avoid the inconvenience of having to install a separate suction pipe 40 for such a long time.

Furthermore, the dirt sucker 60 basically includes a suction motor 61, which provides suction force to the suction nozzle (or nozzle unit) through the suction motor 61 to remove the sucked foreign substances from the suction pipe 40 (or the supply pipe). part) and performs a function of discharging to the discharge pipe (63). At this time, one side of the suction motor 61, specifically, a storage tank 62 for temporarily storing the suctioned foreign substances or a dust collector having a dust collection function is provided on the lower side of the suction motor 61 in FIG. 2, and suction from the target surface A foreign material may be temporarily stored and then discharged to the outside through the discharge pipe 63 .

The filth sucker 60 is based on being provided to frequently remove filth from the target surface 200 generated by the injection of pellets and compressed air, and accordingly, a suction step is further included after the injection step (S3). Thus, it is possible to suction and process the dirt generated by the propellant sprayed on the target surface 200 .

When such a suction step is further included, dirt on the target surface 200 can be easily removed as needed, so that the dirt on the target surface 200 generated after cleaning is blown in the air or remaining on the target surface 200 . Problems can be prevented, and the heat shield sprayed together with the dry ice pellets can be recovered so that it can be maintained in a clean state.

In addition, in the above description, it has been said that the blasting device of the present invention includes a pellet molding machine to mold dry ice into fine particles.

Therefore, before the pellet input step (S1), a pulverizing step of pulverizing dry ice to prepare dry ice pellets may be further included. It may be composed of pellets of different diameters, including fine pellets, in a mixed state.

This is to control the diameter of the dry ice pellets by controlling the degree of pulverization of the dry ice through the pellet molding machine, and the dry ice pellets may be powders in the form of fine particles of 0.1 to 5 mm, or smaller or larger than this, as described above. , so that dry ice pellets of different diameters can be included by adjusting the diameter within the corresponding range.

Preferably, the basic pellets may have a diameter range of 2 to 5 mm, and the fine pellets may have a diameter of 0.1 to 1.5 mm, so that dry ice pellets of different diameters are put into the hopper 10 and used for cleaning. can

Therefore, basic pellets having a relatively large diameter perform the primary cleaning of the target surface 200 with a relatively heavy weight, and fine pellets having a relatively small diameter dig into the gap of the target surface 200 or 1 By enabling secondary cleaning of substances not removed in car washing, it is possible to increase the cleaning power through dry ice pellets of different diameters.

In addition, as a configuration that can be linked thereto, before the above-described spraying step (S3), the process of processing the surface of the target surface 200 to form the unevenness on the target surface 200 may be included.

At this time, the processing of the surface of the target surface 200 refers to grinding the surface of the target surface 200 through a grinder including a rotary grindstone or hitting the target surface 200 using a striking rod or a striking bar. By forming fine irregularities on the 200, it is possible to increase the cleaning efficiency during blasting by forming the irregularities on the target surface 200, which may be a smooth painted surface.

Therefore, when the unevenness is generated on the surface of the target surface 200 as described above, when the propellant is sprayed in the spraying step (S3), dry ice pellets can penetrate into the unevenness of the target surface 200, so that the target surface 200 It is possible to further enhance the cleaning effect on the

In addition, in order to further increase the cleaning power, it is also possible that the spraying step S3 is also composed of a first spraying step and a second spraying step.

The first injection step is a step of first spraying the propellant to the target surface 200 at a pressure of 10 to 20 bar and a speed of 150 to 250 m/s, and is sprayed to the target surface 200 under the high-pressure conditions described above. The surface 200 is cleaned using the instantaneous sublimation force of the dry ice pellets, wind pressure by compressed air, and the impact force of the dry ice pellets and the heat shield by allowing the I to continuously collide.

The second spraying step is a step of secondarily spraying the propellant to the target surface 200 at a pressure of 15 to 30 bar and a speed of 200 to 400 m/s, and at a higher pressure and faster speed than the first spraying step. The propellant is sprayed on the target surface 200 .

Therefore, by making the paint or foreign material that could not be removed in the first spraying step be removed more strongly, powerful cleaning of the remaining material that has not been removed is possible.

It is possible to further strengthen the cleaning power through such repeated cleaning and differential control of pressure and speed, and furthermore, it is possible to maximize the cleaning power by forming irregularities on the surface of the target surface 200 and allowing the propellant to penetrate into the gap.

Furthermore, it was said that the above-mentioned heat shielding agent includes at least one of acrylic resin and wollastonite, and more preferably, the heat shielding agent includes 45 to 60 parts by weight of acrylic resin, 10 to 20 parts by weight of titania powder, 10 to 20 parts by weight of airgel. , 5 to 10 parts by weight of calcium carbonate, and 1 to 10 parts by weight of wollastonite.

Acrylic resin can also be called an acrylic emulsion, and is a resin with excellent adhesion. Basically, it may be composed of an acrylic acid ester or a methacrylic acid ester, further unsaturated carboxylic acid, an acrylic monomer, and the like. At least one of acrylic acid, methacrylic acid, crotonic acid, itaconic acid, and maleic acid may be used as the unsaturated carboxylic acid. As the acryl monomer, at least one of acrylonitrile, acrylamide, N-hydroxyacrylamide, N-butoxy methylacrylamide, styrene, and vinyl acetate may be used. This acrylic resin serves as a binder that allows the heat shield to solidify into granules of a predetermined diameter, such as pellets.

As described above, wollastonite has excellent thermal insulation and thermal insulation properties due to its low thermal conductivity, so it is said that it provides an effect of increasing thermal insulation properties to a heat shield.

Titania powder is a material with excellent thermal insulation properties due to low thermal conductivity. In addition, the mixed use of titania powder can bring a greater advantage in terms of economy than the single use of wollastonite.

Airgel is a compound word of 'aero' meaning air and 'gel' meaning 3D network structure. It is a highly porous nanostructure obtained by replacing the liquid in the gel structure with air while maintaining the gel structure formed during the synthesis. is known as It has high insulation and eco-friendliness, so it has a high application range. When moisture is mixed in the air with the heat shield and moisture is congealed, the disadvantage of poor heat shielding properties can be compensated for through moisture absorption of airgel, thereby preventing deterioration of heat shielding properties. have In addition, it functions to prevent the injection nozzle 50 or the supply pipe 30 from being clogged by absorbing dew condensation that may occur inside the inlet of the injection nozzle 50 or the supply pipe 30 when added to the heat shield.

Calcium carbonate is a carbonate of calcium and is the main component of rocks. It is used as various neutralizing agents in steel making and building materials, and is known as an economical material. As it is added to the heat shield, the cleaning power is increased and friction is increased to help the paint, etc. detach from the target surface 200 .

Therefore, the heat shield prepared with the above composition is hardened into a solid state, molded into pellets like dry ice, mixed with dry ice pellets, and sprayed on the target surface 200 as a propellant.

The above-mentioned heat shielding agent has an effect of preventing the inlet of the spray nozzle 50 from being clogged by condensed moisture by enhancing friction and having functions of moisture absorption, heat insulation, and heat shielding while performing a function of increasing cleaning power.

In addition, the heat shield may further include a heat shield enhancer in order to strengthen the heat shielding property, and the heat shield enhancer may be added in an amount of 1 to 10 parts by weight in a state including the aluminosilicate nanoparticles.

That is, the heat shielding agent is 45 to 60 parts by weight of acrylic resin, 10 to 20 parts by weight of titania powder, 10 to 20 parts by weight of airgel, 5 to 10 parts by weight of calcium carbonate, 1 to 10 parts by weight of wollastonite, 1 to 10 parts by weight of heat shielding agent. It may consist of a composition comprising 1 to 10 parts by weight.

Aluminosilicate nanoparticles, an active ingredient of the heat-shielding enhancer, are a substance obtained by substituting aluminum for a part of silicon constituting the silicate, and are abundantly present in nature in the form of minerals. It has a moisture absorption function for moisture, and the nano-sized aluminosilicate forms a fine and dense heat insulating film on the surface of the pellet composed of a heat shield, thereby exhibiting excellent heat insulating effect.

Therefore, when the heat shielding agent containing aluminosilicate nanoparticles is added, the aluminosilicate nanoparticles absorb dew or moisture generated around the spray nozzle 50, and at the same time, the heat shielding performance is improved, so that the moisture in the air freezes. It is possible to prevent the spray nozzle 50 from being clogged.

Furthermore, the heat-shielding enhancing agent may further include an additional composition in addition to the aluminosilicate nanoparticles.

5 is a flowchart illustrating a step of manufacturing a heat-shielding reinforcing agent.

Referring to FIG. 5 , the heat-shielding enhancer of the present invention may be prepared through the steps of preparing a first dispersion, preparing a second dispersion, and completing the heat-insulating enhancer.

(S11) No. 1 Steps to prepare the dispersion

First, 15 to 20 parts by weight of aluminosilicate nanoparticles, 10 to 15 parts by weight of aragonite, and 70 to 90 parts by weight of n-propyl acetate are mixed to prepare a first dispersion.

As described above, the aluminosilicate nanoparticles have a moisture absorption function for moisture, and the heat shield is dried and pulverized to form a fine heat insulating film on the surface of the produced pellets, resulting in excellent heat insulation and heat shielding effect and at the entrance of the spray nozzle 50 It was said to be a material that can have both the moisture absorption effect against the dew condensation.

Aragonite is one of the representative carbonate minerals along with calcite. It has a colorless transparent or white translucent color and has a luster like glass. Since it is a carbonate, it shows a high level of strength and has excellent thermal and thermal insulation properties.

n-Propyl acetate is a transparent, colorless liquid with a pleasant odor, and is used as a solvent for dispersions of aluminosilicate nanoparticles and aragonite in a heat-shielding enhancer.

(S12) 2nd Steps to prepare the dispersion

Next, 80 to 90 parts by weight of the first dispersion, 5 to 15 parts by weight of tetraethylammonium hydroxide, and 3 to 10 parts by weight of a thermoplastic olefin (TPO: Thermoplastic Olefin) are mixed to prepare a second dispersion. do.

Tetraethylammonium hydroxide (tetraethylammonium hydroxide) has excellent mutual repulsion, so that various components included in the heat-shielding enhancer, especially aluminosilicate nanoparticles and aragonite particles do not aggregate or sink in the dispersion, and have a stable dispersion form. added to

Thermoplastic Olefin (TPO: Thermoplastic Olefin) is a product with improved functions of polypropylene. It has excellent heat resistance, impact resistance, and processability, so its use is expanding in various fields including automobile interior and exterior materials, electrical and electronic products, and industrial building materials. It is a polymer. It shows high rigidity, heat resistance, high impact property, high workability, and further heat insulation, and as it is added to the heat shielding agent, it plays a role in improving the rigidity, heat resistance, workability, and heat insulating properties of the heat shielding agent.

(S13) thermal insulation Steps to complete the reinforcer

Finally, 85 to 95 parts by weight of the second dispersion, 1 to 10 parts by weight of pearlite, 1 to 10 parts by weight of 2-ethyl hexanol, and bisphenol-A glycerolate (bisphenol-A) glycerolate) 1 to 10 parts by weight are mixed to complete the heat-shielding enhancer.

Perlite is a material made into a porous material by crushing perlite and obsidian and then baking it at around 1,000℃. It has excellent thermal insulation and heat shielding properties, and since it is a material with high rigidity, the cleaning ability of the propellant mixed with the heat shielding agent can be improved when added to the heat shielding agent.

2-Ethylhexanol is a material used for silk processing of textiles, dyes, resins, solvents for oil, plasticizers, and wetting agents, and is added as a plasticizer in the heat-shielding enhancer of the present invention. That is, the processability of the thermoplastic olefin included in the heat-shielding enhancer can be further improved, and the mixability can be further improved.

Bisphenol A glycerolate is a material used as a raw material for manufacturing plastics and is also used as an antioxidant for plastics. It is added to improve the mixability of the heat-insulating agent composition and at the same time to improve the strength of the heat-insulating agent pellets produced.

Therefore, as such a heat-shielding reinforcing agent is added to the heat-insulating agent, heat-shielding performance is improved and a moisture absorption function against dew condensation can be added. It is possible to prevent clogging, and it is possible to further improve the cleaning ability by increasing the frictional force when mixed with the propellant by including a large number of inorganic fillers.
As described so far, the dry ice blasting method according to the present invention has been expressed in the above description and drawings, but this is merely an example and the spirit of the present invention is not limited to the above description and drawings, and the technical spirit of the present invention is not limited to the above description and drawings. Of course, various changes and modifications are possible without departing from the scope.

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10: Hopper 11: Inlet
12: lower transfer body 13: rotary plate
14: rotating shaft 15: rotating scraper
16: auxiliary scraper 17: fixed scraper
18: reduction motor 20: air compressor
30: supply pipe 40: suction pipe
45: on-off valve 50: spray nozzle
60: dirt sucker 61: suction motor
62: storage tank 63: discharge pipe
70: controller 100: case
200: target surface 300: pellet molding machine
400: heat shield supply device

Claims (9)

As a dry ice blasting method,
A pellet input step of putting dry ice pellets pulverized by dry ice into a hopper;
A heat insulating agent comprising 45 to 60 parts by weight of acrylic resin, 10 to 20 parts by weight of titania powder, 10 to 20 parts by weight of airgel, 5 to 10 parts by weight of calcium carbonate, and 1 to 10 parts by weight of wollastonite is added to the hopper. a mixing step of mixing with the dry ice pellets after input;
Compressed air injection step of mixing the compressed air in the hopper to prepare a propellant;
A blasting method comprising a; a spraying step of spraying the propellant on the target surface. The method of claim 1,
After the spraying step,
A blast method, characterized in that it includes; a suction step of sucking the dirt generated on the target surface. The method of claim 1,
The dry ice pellets,
It is put into the hopper through the first supply pipe connecting the pellet molding machine and the hopper,
The heat shielding agent,
It is put into the hopper through a third supply pipe connecting the heat shield supply device and the hopper,
The compressed air is
It is input to the hopper through a second supply pipe connecting the air compressor and the hopper,
The propellant is
It is provided to the spray nozzle via a fourth supply pipe connecting the hopper and the spray nozzle to be sprayed on the target surface,
At least one of the first supply pipe and the fourth supply pipe,
As provided along the circumference of at least one of the outer circumferential surface and the inner circumferential surface, the blast method, characterized in that it comprises a heating string made of a hot wire. The method of claim 1,
Before the spraying step,
Containing, including;
The spraying step is
A first spraying step of first spraying the propellant to the target surface at a pressure of 10 to 20 bar and a speed of 150 to 250 m/s;
The blast method, characterized in that it comprises a secondary spraying step of secondarily spraying the propellant to the target surface at a pressure of 15 to 30 bar and a speed of 200 to 400 m/s. The method of claim 1,
The heat shielding agent,
Including 1 to 10 parts by weight of a heat-shielding enhancer containing aluminosilicate nanoparticles,
45 to 60 parts by weight of acrylic resin, 10 to 20 parts by weight of titania powder, 10 to 20 parts by weight of airgel, 5 to 10 parts by weight of calcium carbonate, 1 to 10 parts by weight of wollastonite, 1 to 10 parts by weight of the heat shielding enhancer Blast method, characterized in that it includes parts by weight. 6. The method of claim 5,
The heat shielding enhancing agent,
preparing a first dispersion by mixing 15 to 20 parts by weight of aluminosilicate nanoparticles, 10 to 15 parts by weight of aragonite, and 70 to 90 parts by weight of n-propyl acetate;
Preparing a second dispersion by mixing 80 to 90 parts by weight of the first dispersion, 5 to 15 parts by weight of tetraethylammonium hydroxide, and 3 to 10 parts by weight of Thermoplastic Olefin (TPO) ;
85 to 95 parts by weight of the second dispersion, 1 to 10 parts by weight of pearlite, 1 to 10 parts by weight of 2-ethyl hexanol, and bisphenol-A glycerolate The blast method, characterized in that it is prepared through; mixing 1 to 10 parts by weight to complete the heat-shielding strengthening agent. delete delete delete

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