KR100880905B1 - Method of coating eps beads for fire proof board - Google Patents

Abstract

A method of coating EPS(Expanded Polystyrene) beads is provided to efficiently and uniformly coat EPS beads suitable for the production of fire retardant EPS boards. In a method of coating the fire retardant solution on surfaces of the preliminarily foamed EPS beads by injecting preliminarily foamed EPS beads and a fire retardant solution into a mixing vessel and mixing the preliminarily foamed EPS beads with the fire retardant solution, a method of coating a fire retardant on EPS(Expanded Polystyrene) beads comprises: separating the EPS beads that have been coated with the fire retardant and the EPS beads that have not been coated or have been less coated with the fire retardant from each other by a specific gravity difference between EPS beads that have been coated with the fire retardant and EPS beads that have not been coated or have been less coated with the fire retardant according to the amount of the fire retardant coated on the surfaces of the preliminarily foamed EPS beads; and successively mixing the EPS beads that have not been coated or have been less coated within the mixing vessel while discharging the EPS beads that have been coated to the outside of the mixing vessel.

Description

Method of Coating EPS Beads for Fire Proof Board

The present invention relates to a method of coating EP beads, and more particularly, to a method capable of efficiently and uniformly coating EP beads required to produce a flame retardant expanded polystyrene board. .

In general, EPS board (EPS Board) refers to a product made in the form of a board plate by molding a foam polystyrene in a block shape, and then cut to a certain thickness. This board is made of foamed polystyrene and has good workability and very light characteristics.

In addition, since the EP board is manufactured by foaming the EP beads, it has a number of micropores therein, which is excellent in insulation, and can effectively block noises and conversation contents coming from the outside. It was considered as insulation and noise prevention material of building, and is actually used as insulation of building.

On the other hand, since the PS board is vulnerable to fire and easily burned when exposed to fire, only the flame retardant PS board has been regulated to be used as a heat insulating material of buildings.

Today, the manufacturing method of flame retardant PS board is divided into impregnation method using organic flame retardant and coating method using inorganic flame retardant based on the flame retardant and flame retardant treatment method used. Can be divided.

The impregnation method using an organic flame retardant is a method of utilizing organic materials including an organic halogen element as a flame retardant used in EP board. This method appeared early in the process of pursuing flame retardancy of the EP board, by using an organic halogen compound having an inert characteristic as a flame retardant, by adding the organic halogen compound with a blowing agent during the polymerization of styrene monomer The impregnated flame retardant was directly impregnated into the produced EPS bead particles. However, since this method generates more harmful gases harmful to the human body from the above organic halogen compounds contained in the EP board in case of fire, it is rarely used today.

The method of using inorganic flame retardant is to prepare an inorganic flame retardant by coating inorganic flame retardant on the surface of the EPS board, and first, to coat the inorganic flame retardant on the surface of the individual EPS beads. After that, the flame retardant coated PS beads may be foamed again to prepare a flame retardant PS board. Regardless of the method, if the flame retardant PS board using the inorganic flame retardant is used as a heat insulating material of the building, even if a fire occurs, the inorganic flame retardant forms the barrier from the fire flame, so It is most widely used today because it can prevent the exposure of the EP board to flame and also does not decompose inorganic flame or generate harmful gas.

First, the method of coating the inorganic flame retardant on the surface of the PS board (Board Coating Method) is to pre-foam the EP beads first, and then again foamed in the inside of the block-type mold to manufacture the EP blocks once After cutting the above ES block to a predetermined thickness and converting it to an ES board (flat plate), the inorganic flame retardant solution is coated on one or both surfaces of the ES board (flat plate), and the inorganic flame retardant solution is dried. Proceed in such a way.

This method has a merit that it can be divided into flame retardant PS board or ordinary PS board according to the usage of the PS board once manufactured. In other words, if a flame retardant PS board is required, the produced PS board may be coated with an inorganic flame retardant solution, and if a general EP board is required, it may be sufficient to ship without performing an inorganic flame retardant treatment separately. . However, in the case of a flame retardant PS board, the flame retardant is coated only on the surface thereof, and since the flame retardant does not exist inside the PS board, it is inevitable that the flame retardant performance becomes very low. In order to remedy this drawback, the so-called sheath method is cut in several places in the middle of the EP board, and a flame retardant solution is added there.

On the other hand, the method of directly coating the inorganic flame retardant on the surface of the EP beads (Bead Coating Method) is to coat the flame retardant solution directly on the spherical surface of the primary pre-foamed EP beads, and then to coat the coated EP beads again Secondary foaming.

This method coats each of the first pre-foamed EP beads with a flame retardant, and secondly foams the flame retardant-coated EP pre-foamed particles again to form an EP block, and then turns the EP block to a predetermined thickness. Since the cutting, the flame retardant is contained not only on the surface of the PS board, but can be expected to uniformly distribute the flame retardant throughout the entire PS board. Therefore, the flame retardant PS board manufactured in this manner has the advantage of exhibiting more efficient flame retardant performance than the flame retardant PS board manufactured by any other method.

However, the conventional method for manufacturing a flame retardant PS board is prepared by putting the first pre-foamed EP beads and a flame retardant solution in a predetermined container, mixed them for a predetermined time, and then drying them. This method was carried out by putting a predetermined amount of EP beads and a predetermined amount of flame retardant solution into one container (tank), and after coating the EP beads with the flame retardant solution, they were added to the container (tank). ), And then added fresh EP beads and flame retardant solution. That is, in the prior art, even in the case of the bead coating method was carried out in a batch process (Batch Process).

However, this method mixes the ES board and the flame retardant solution with each other in one tank, and again dries there and adheres to the batch input and batch recovery method, so that the spherical shape of the EP board depends on the amount of the flame retardant solution added. It was difficult to evenly and evenly coat the globular shape. For example, if the solution of the flame retardant is insufficient, there is a normal coating layer and an abnormally thin coating site, whereas if the solution of the flame retardant is excessively large, a coating layer of a normal thickness and an abnormally thick coating site are generated. I was losing. This resulted in the direct and indirect negative effects on the flame retardant performance of the final EP board.

As a result, the flame retardant FPS board is to determine the final flame retardant performance by whether or not to form a thin film uniformly by coating a flame retardant material on the surface of the secondary foamed PS beads, the conventional method This had the limitation that it could not cover the flame retardant material efficiently and uniformly.

In addition, according to the conventional method, there was also a limitation that the flame retardant solution could not be uniformly coated on the surface of the EP beads by a continuous method.

As described above, the coating method of the surface of the EP bead generally practiced in the past was simultaneously coated and dried in one container (tank), and could not be precisely and uniformly coated in the process, and continuously It could not be done.

Accordingly, it is an object of the present invention to provide a method for coating EP beads that can efficiently and uniformly coat EP beads suitable for producing a flame retardant PS board.

Another object of the present invention is to provide a continuous coating method capable of coating the flame retardant solution and pre-foamed ePS beads while covering them efficiently and uniformly.

In the coating method of the EP beads according to the present invention, the pre-foamed beads and the flame retardant solution are pre-foamed into a predetermined mixing container, and the pre-foamed ES beads and the flame retardant solution are mixed to the preliminary solution. Depending on the amount of flame retardant coated on the surface of the pre-foamed EP beads while coating the flame retardant solution on the surface of the foamed EP beads, the coated PS beads and the yet uncoated or less coated EP beads They are separated from each other by the difference in their specific gravity, while the fully coated EP beads are discharged to the outside while the uncoated or less coated EP beads are continuously mixed inside the mixing vessel. At this time, by continuously blowing air upward from the bottom of the mixing vessel, the coated EP beads and the uncoated or less coated EP beads are separated from each other by the difference in specific gravity. .

According to the method of coating the flame retardant according to the present invention, as the ES beads and the flame retardant solution are mixed inside the mixing vessel, the ES beads sufficiently coated with the flame retardant are relatively heavy, and thus, the lower side of the mixing vessel. On the other hand, the uncoated or less coated EP beads are relatively light and therefore rise above the mixing vessel.

The present invention utilizes such a phenomenon of layer separation, while only the bottom EP beads are discharged and recovered, while continuously supplying the pre-foamed ES beads and the flame retardant solution into the mixing vessel, It is possible to efficiently coat the flame retardant solution on the surfaces of the EP beads in a continuous manner.

Since the coating method of the EP beads according to the present invention uses the difference in specific gravity of the EP beads and the specific gravity of the flame retardant, it is possible to distinguish between the non-flame retardant coating and the flame retardant coated on the EP beads by natural falling. It is possible to easily determine whether the PS beads are flame retardant coated.

In addition, the coating method of the EP bead according to the present invention, while continuously discharging the flame retardant coated PS bead to the outlet of the lower portion of the mixing vessel, while the flame retardant is not coated in the upper inlet of the mixing vessel Since it can be continuously added, there is an advantage that can be processed in a continuous process EP beads.

In addition, the coating method of the EP bead according to the present invention can be coated in a short time and evenly coated flame retardant to the EP bead when a plurality of mixed containers are arranged in a series of processes to be processed in a continuous process. There are advantages to it.

The coating method of EP beads according to the present invention proceeds with technical contents completely different from those of the conventional method. The coating method of the EP beads according to the present invention has the greatest feature in that it uses the difference between the specific gravity of the EP beads coated with the flame retardant solution and the specific gravity of the EP beads not yet coated with the flame retardant solution.

In the coating method of EP beads according to the present invention, a pre-foamed ES beads and a flame retardant solution are weighed into a predetermined mixing container, and the pre-foamed ES beads and the flame retardant solution are mixed and mixed. The flame retardant solution is coated on the surface of the pre-foamed EP beads. In the present invention, the method of mixing the EP beads and the flame retardant solution may be performed in a conventional manner.

In addition, the flame retardant solution may be used that is commonly used in the art, it is not particularly limited. For example, the flame retardant solution may be composed of a binder resin, powder-type inorganic flame retardant and other additives disclosed in Japanese Patent Laid-Open No. 58-147440, "Flame Retardant Thermoplastic Foam." Examples of the binder resin include polyvinyl acetate, copolymers of vinyl acetate and ethylene, copolymers of vinyl acetate and acrylate esters, copolymers of vinyl acetate and isobutene, terpolymers of vinyl acetate, ethylene and vinyl chloride, styrene and Emulsions of resin components, such as copolymers of butadiene, copolymers of ethyl methacrylate and butadiene, polymers of butyl acrylate, copolymers of acrylonitrile and butadiene, copolymers of styrene and isobutene, and modified carbonic acid thereof And so on. As the powder type inorganic flame retardant, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, calcium carbonate, sodium silicate, expanded graphite, or the like may be used alone or in combination of two or more thereof. As the other additives described above, dispersants may be commercially available for use in aqueous and latex resins (TEGO, BYK, etc.).

In the present invention, the composition ratio of the flame retardant solution may also be used within the range commonly used in the art. For example, the flame retardant solution is 25 to 65% by weight of the binder resin, may be composed of 35 to 75% by weight of the powder-type inorganic flame retardant, the other additives may be used in less than 5% by weight of the total flame retardant solution. . The present invention is not limited by the type and composition ratio of the flame retardant, but is characterized in that it utilizes the difference in specific gravity between coated EP beads and uncoated EP beads.

In addition, according to the present invention, the coating method of the EP beads according to the amount of the flame retardant coated on the surface of the pre-expanded EP beads and the specific weight of the coated EP beads and yet uncoated or less coated EP beads Separate from each other by the difference of. Since the specific gravity of the flame retardant solution is much heavier than the specific gravity of the EP beads, the specific gravity varies depending on the amount of the flame retardant solution coated on the surface of the EP beads. To separate them from each other.

In the present invention, it is preferable to use air as an auxiliary means as a separation means using the difference in specific gravity of the EP beads. The air is preferably supplied upward from the inside of the mixing vessel upwards. When the air is blown upward from the bottom of the mixing vessel, as the ES beads and the flame retardant solution are mixed inside the mixing vessel, the PS beads coated with the flame retardant are relatively heavy, so While descending downwards, uncoated or less coated EP beads are relatively light and therefore rise above the mixing vessel and flow upwards through them to simultaneously dry the flame retardant solution. Because it can be done.

When the coating method of the EP beads according to the present invention is separated from each other by the difference in specific gravity, the sufficiently coated EP beads are discharged to the outside of the mixing container, while the uncoated or less coated EP is not yet coated. S beads are continuously mixed in the mixing vessel. The present invention utilizes such a phenomenon of layer separation, while only the bottom EP beads are discharged and recovered, while continuously supplying the pre-foamed ES beads and the flame retardant solution into the mixing vessel, It is possible to efficiently coat the flame retardant solution on the surfaces of the EP beads in a continuous manner.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in more detail. However, the accompanying drawings are only intended to describe the technical spirit of the present invention in more detail, and the technical spirit of the present invention is not limited thereto.

As a more preferred embodiment, the coating method of the EP bead according to the present invention can be carried out by the continuous coating method by the automated equipment in the following manner.

Coating method of the EP bead according to the present invention is a preparation step (S 110) for putting the EP bead into the mixing vessel of the EP bead and preparing for mixing; Spraying a flame retardant solution to coat the flame retardant on the charged EP beads (S 120); Coating the flame retardant solution with the EP beads in the mixing vessel and separating the coated EP beads and the uncoated EP beads at step S 130; Discharging the coated EP beads out of the mixing vessel (S 140); It can be carried out including.

As a more preferred embodiment, after the above discharge step (S 140), check whether the operation is terminated, and if the end signal is received, the process proceeds to the end step (S 150), if the end signal is not received It is preferable to proceed repeatedly from the flame retardant injection step (S 120).

In the present invention, the same mixing vessel may be used in the repeating step, or different mixing vessels may be arranged.

In the present invention, when the other mixed container is used in an arrangement, the mixed container may use two to eight, more preferably three to five.

1 is a block diagram of a schematic embodiment of a coating method of EP beads according to the present invention,

Figure 2 is a block diagram of a continuous embodiment of a coating method of EP beads according to the present invention, and relates to the case of using the same mixing vessel 100,

3 is a block diagram of a continuous embodiment of the coating method of the EP bead according to the present invention, and relates to the case of using a plurality of different mixing vessels 100,

Figure 4 is a schematic partial cutaway perspective view of the mixing vessel 100 of the EP bead suitable for carrying out the coating method of the EP bead according to the present invention.

The present invention includes a preparation step (S 110) for putting the ES beads in the mixing vessel of the EP beads and preparing for mixing.

The present invention relates to a method of coating the EP beads with a flame retardant, in order to perform this automatically, it is preferable to proceed using the mixing vessel 100 of the following EP beads.

In the present invention, the mixing vessel 100 of the EP bead is composed of a cylindrical shape and the inside of the hollow body portion 110, the body portion 110 is supplied to the PS beads in the upper portion Preferably, the hole 112 and the lower part of the EP bead discharge hole 114 are included. Preferably, the ES bead supply hole 112 is formed above the body portion 110, and the ES bead discharge hole 114 is preferably formed below the body portion 110. Do.

In the present invention, the body portion 110, together with the transfer screw 14 and the transfer motor 16, in order to receive the EP beads from the hopper 12, the hopper 12 and the above-mentioned It is preferable that the S bead supply holes 112 are coupled to each other.

According to the present invention, when the ES bead is lowered from the hopper 12 to the bottom of the bottom, the conveying screw 14 is rotated by the rotation of the conveying motor 16, and the EPS is beaded by the rotation. It is sent to the supply hole 112, EP beads are introduced into the body portion (110). If the CS beads are continuously introduced into the body portion 110, the inside of the body portion 110 is gradually filled with PS beads.

The present invention includes the step (S 120) of spraying a flame retardant solution in order to coat the flame retardant on the injected EP beads.

In the present invention, when the EP beads are filled in the body 110, the flame retardant solution supplied from the outside is contacted with the surface of the EP beads to be coated, and the spraying of the flame retardant solution (S 120) is performed. It is preferable to use said mixing container 100 also in advancing.

In the present invention, the mixing vessel 100 includes a flame retardant injection unit for injecting a flame retardant solution to the PS beads introduced into the body portion 110. The flame retardant injection unit includes a supply pipe 122 for transferring the flame retardant solution from the outside to the inside of the body portion, and an injection nozzle 124 for spraying the flame retardant solution from the supply pipe 122 to the EP beads.

In the present invention, the supply pipe 122 provides a passage for transferring the flame retardant solution into the body portion 110 from the flame retardant supply container (not shown) containing the flame retardant solution, the injection nozzle 124 may be an injection nozzle connected to the supply pipe 122 or an injection hole formed by directly making a small hole in the supply pipe 122. The flame retardant solution may be sprayed to coat the flame retardant solution on the surface of the EP beads. do. The supply pipe 124 and the injection nozzle 124 is preferably formed above the body portion 110.

In the present invention, when the flame retardant solution is sprayed through the supply pipe 124 and the injection nozzle 124, the sprayed flame retardant solution is to be coated on the nearest PS beads.

The present invention includes the step of coating the flame retardant solution in the interior of the mixing vessel 100 and at the same time separating the coated PS beads and uncoated EP beads (S 130).

In the present invention, when the flame retardant solution is injected through the supply pipe 124 and the injection nozzle 124, at the same time or immediately thereafter, the EP beads coated with the flame retardant solution and the EPs not coated with the flame retardant solution The beads are mixed with each other to convert to EP beads coated entirely with a flame retardant solution. To this end, the present invention is also preferably to use the mixing vessel (100).

In the present invention, the mixing vessel 100 generates a rotational motion by the electric motor 132, and transfer it to the motor shaft 134, it is preferable to rotate the rotary blade 136 coupled thereto. . As the rotary blade 136 rotates inside the body 110, the state of the interior is converted into turbulent turbulence by the turbulent flow, the flame retardant-coated EP beads and the non-PI You will have a complete mix of S beads. In this process, the EP beads coated with the flame retardant solution and the EP beads not otherwise collided with each other, and in the process, the flame retardant solution is changed to the state coated with the EP beads.

In the present invention, the rotary blade 136 is preferably rotated at a speed of 10 rpm to 100 rpm to mix the EP beads in the interior of the body portion 110 with each other. When the rotary blade 136 rotates at a speed of 10 rpm or less, the rotation speed is too slow to prevent proper mixing, and when rotated at a speed of 100 rpm or more, the flame retardant solution buried on the surface of EP beads This is because they are separated by the centrifugal force, and thus the actual mixing and coating operations cannot be performed. In addition, the rotary blade 136 is preferably formed to be inclined upward with respect to the direction of rotation, it is preferable that the JS beads that hit against it along the inclined surface during rotation. This is to double the mixing effect of EP beads in rotation.

On the other hand, in the present invention, the above EP beads already have a large number of fine bubbles (pinhole) therein through the first preliminary foam and the second pre-foaming, the specific gravity is about 0.01 to 0.001. . Therefore, these beads are very light and have a property of being easily floated in the air even with a slight wind from the outside. In contrast, the flame retardant solution has a specific gravity that varies depending on the type of flame retardant, but is usually in the range of 1.1 to 2.2, which means that it has a very large specific gravity compared to the EP beads.

As such, these flame retardant coated EP beads naturally fall downward (because they have a higher specific gravity than those that do not), and the flame retardant coated CS beads rise to the upper space relatively. You tend to go. In this state, since the rotor blade 136 rotates inside the body 110 to stir the EP beads, the already coated EP beads collide with each other and rub the flame retardant solution coated on each other. As you apply it, it will gradually move downwards, forming an even layer, while the still uncovered EP beads will rise upwards. The upwardly raised beads are covered by the flame retardant solution by the injection nozzle 124, and then mixed and bumped with the other PS beads, thereby undergoing the above described process.

In addition, the mixing vessel 100 preferably includes an air supply unit for supplying air to the inside of the body portion 110 from the outside. The air supply unit includes an air supply pipe 142 for supplying air from the outside, and an air supply plate 144 connected to the air supply pipe 142. The air supply pipe 142 is connected to an air supply means such as an air compressor (not shown) or a high pressure vessel (not shown) existing outside, and receives air from them, the air supply plate 144 is installed at the lower end of the body portion, and preferably includes a plurality of small air holes to uniformly supply air into the body portion 110.

In the present invention, the air supplied by the air supply plate 144 rises upward from the bottom of the bottom of the body portion 110, in the process to push up the EP beads upwards. Thus, in principle, the PS beads tend to be pushed upwards, but the PS beads already coated by the flame retardant solution from the top are relatively high in specific gravity and are lowered to the bottom, and only the uncovered EP beads are upper Will be raised.

In addition, in the present invention, the air supplied by the air supply plate 144 ascends upward to pass through the surface of the EP coated with the flame retardant solution, in the process, to take water from the flame retardant solution The surface of the EPS is dried. Therefore, as the moisture is dried, the PS beads coated with the flame retardant have a higher specific gravity, and tend to be lowered further.

As such, when the mixed container 100 is used, the EP beads which are not yet coated with the flame retardant solution tend to continuously rise upwards, whereas the EP beads that are already coated with the flame retardant solution may be used in the body portion ( The inside of the 110 is uniformly coated on the surface of each other, and the first dry beads are tended to descend even more downward.

Accordingly, the present invention is to be able to naturally separate the ES beads coated with the flame retardant and the ES beads not coated with the flame retardant by using the difference in specific gravity.

The present invention includes a step (S 140) for discharging the EP beads coated with the flame retardant out of the mixing vessel (110).

In the present invention, the EP beads coated with the flame retardant are lowered to the bottom of the mixing container 110, while the EP beads not yet coated with the flame retardant are raised to the upper side of the mixing container 110, and thus the flame retardant is Only the ES beads coated with the discharged from the bottom of the mixing vessel 110.

In the present invention, since the cylindrical body portion 110 is rotated at a constant speed by the rotary blade 136, the EP beads are outward by the centrifugal force. By the way, the piezobeads descended downward are piezobeads sufficiently covered with a flame retardant in the body portion 110 and have a relatively high specific gravity. Therefore, it is pushed out by centrifugal force while being rotated by the rotary blade 136, and pushed outwards near the bottom surface of the body 110 to reach the EP bead discharge hole 114 while rotating. As a result, it is naturally discharged out of the discharge hole 114 by the centrifugal force.

The present invention includes a termination step (S 150) to recover the PS beads discharged out of the mixing vessel 100 to enter the next operation.

In the present invention, the ending step (S 150) is to recover the EP beads coated with the flame retardant using the mixing vessel 100, and finishes all the work. After that, it is usually put directly into the molding machine to make the EPS block, or stored in a certain storage place and then put into the molding machine as needed to make the EPS block, this part is beyond the scope of the present invention, Omit the description.

Through this series of steps, the present invention efficiently coats the flame retardant solution on the surfaces of the EP beads while simultaneously drying the flame retardant coated EP beads and flame retardant coated EP beads. It is to be efficiently separated, it is possible to recover and obtain only EP beads coated with a flame retardant.

The present invention is an intermittent method when the final end step (S 150) is completed through the above-mentioned steps, and when it is repeated and continuously, it can be utilized as a continuous method.

As a more preferred embodiment, after the above discharge step (S 140), check whether the operation is terminated, and if the end signal is received, the process proceeds to the end step (S 150), if the end signal is not received It is preferable to proceed repeatedly from the flame retardant injection step (S 120). This means that it proceeds substantially continuously.

In the present invention, in the repeating step, the same mixing container 100 may be used as shown in FIG. 2, and as shown in FIG. 3, the mixing container 100 having a plurality of body parts is arranged. You can repeat the same steps in turn.

In the present invention, when using a plurality of the body portion arranged, the body portion may use 2 to 8, more preferably 3 to 5 can be used.

As a more preferred embodiment of the coating method of the EP bead according to the present invention, a case where this is repeatedly performed using one hopper 12 and one body portion 110 will be described.

2 exemplarily illustrates such a case.

In this case, the primary coated EP beads are processed in the same manner as described above, and the flame retardant spraying step (S 120) is repeated repeatedly. To this end, it is to transfer the primary coated EP beads exiting the outside through the discharge port 114 to the EP bead supply hole 112 of the body portion 110 by using a transfer screw or high pressure air. desirable.

Subsequent steps thereafter may proceed in the same manner as described above.

In addition, the coating method of the EP bead according to the present invention as another preferred embodiment, it can be used by combining one hopper 12 and two body portion 110 and the body portion 210.

3 and 5 exemplarily illustrate such a case.

Hereinafter, such a method will be described.

In the present invention, the body portion 110 is coupled to the hopper 12 and each other via the EP bead supply hole 112, while the discharge hole of the body portion 110 It is coupled to the supply hole 212 of the body portion 210 via the second transfer screw 24.

In the present invention, since the configuration and the working relationship of the body portion 210 is the same as described above, a detailed description thereof will be omitted. However, it is important that the body portion 110 is arranged to be positioned above the body portion 210 to be coupled thereafter. This is to coat the flame retardant by the difference in specific gravity of the EP beads, so as to secondarily coat the coated EP beads.

In the present invention, the EP beads coated in the body portion 110 are supplied to the body portion 210, and thereafter, to spray the secondary flame retardant solution by the injection nozzle ( S 220).

At this time, the primary coated EP beads are again coated on the secondary flame retardant solution. The secondary flame retardant solution may be the same or different flame retardant solution as the primary coated flame retardant solution. If the secondary coated flame retardant solution is different from the primary coated flame retardant solution, the EP beads will form a composite coating layer with flame retardants having different properties. The flame retardant solution may be used a flame retardant solution commonly used in the art.

In the present invention, the EP beads coated with the secondary flame retardant solution are again coated on the primary coated coating layer in the same manner as described above, and the specific gravity of the EP beads becomes higher as the coating layer is formed. At this time, while rotating by the rotary blades, the secondary coating layer is uniformly formed with each other, also due to the difference in specific gravity, the EP beads still have the primary coating layer is directed upward, while forming the secondary coating layer to some extent DIESEL beads are separated to exist downward (S 230).

In the present invention, the secondary coated EP beads descending to the lower layer are also pushed outwards by centrifugal force and are eventually pushed out of the outlet, so that only the secondary coated EP beads are efficiently It is automatically discharged from the unit 210 (S 240).

In the present invention, when the secondary coated EP beads are discharged from the body portion 210, it is determined whether or not to end all operations. If you have to finish all the work, terminate it, whereas if you need more cover work, repeat the above steps.

In the case of Figure 3, in order to comprehensively and generally express such a situation, it is only shown to return to the primary process, and can be substantially connected to other body parts 310, 410, 510 can proceed. It is.

As another preferred embodiment of the present invention, a plurality of body parts can be arranged in series and joined, and the PS beads can be sequentially and continuously coated.

3 and 7 schematically illustrate an embodiment composed of one hopper 12 and five body parts 110, 210, 310, 410, and 510 as such a situation.

In the present invention, the hopper 12 and the body portion 110 are coupled to each other via the EP bead supply hole 112, while the remaining body portions 210 and 310 are coupled to each other. The 410 and 510 are preferably coupled to each other by the respective transfer screws 24, 34, 44 and 54.

In addition, in the present invention, each of the body parts is preferably arranged in a zigzag pattern with each other. This is because the overall device can be minimized the space between each other, thereby improving work efficiency and space utilization.

In addition, in the present invention, it is desirable to combine a fluidized bed dryer (not shown) to the body portion 510 which is finally arranged last. This is because the finally coated EP beads can be more completely dried, and the process of transferring them to a storage place can be simultaneously performed. The fluidized bed drier may be one conventionally used in the art.

In the present invention, the EP beads discharged from the body portion 210 may be recovered and used to suit the purpose of use, or may be used after being stored for a certain period of time.

In the above description of the coating method of ePS bead according to the present invention in detail, but this is only described the most preferred embodiment of the present invention, the present invention is not limited thereto, the scope of the appended claims Is determined and defined.

In addition, anyone of ordinary skill in the art will be able to make various modifications and imitations by the description of the specification of the present invention, but it will be apparent that this is also outside the scope of the present invention.

1 is a block diagram of a schematic embodiment of the present invention,

2 is a block diagram of a continuous embodiment according to the present invention, and relates to the case of using the same mixing container 100,

3 is a block diagram of a continuous embodiment according to the present invention, and relates to the case of using a plurality of different mixing vessels 100,

4 is a schematic partial cutaway perspective view of a mixing container 100 of PS beads suitable for implementing the coating method of EP beads according to the present invention;

FIG. 5 is a side view of a preferred embodiment of the coating method of EP beads according to the present invention, in which one hopper 12 and two body parts 110 and 210 are used.

FIG. 6 is a side view of using one hopper 12 and five body parts 110, 210, 310, 410, and 510 as another embodiment of the present invention.

♠ Explanation of symbols for the main parts of the drawings.

100: mixed container 110, 210, 310, 410, 510: body part,

112: IDE bead supply hole, 114: JS bead discharge hole,

122: flame retardant supply pipe, 124: injection nozzle,

132: electric motor, 134: motor shaft,

136: rotor blade, 142: air supply pipe,

144: air supply plate.

Claims (10)

The pre-foamed ES beads and the flame retardant solution were introduced into the mixing vessel, and the pre-foamed ES beads and the flame retardant solution were mixed to coat the flame retardant solution on the surface of the pre-foamed ES beads. In the method of letting Depending on the amount of flame retardant coated on the surface of the prefoamed EP beads, the coated EP beads and the uncoated or less coated EP beads are separated from each other by the difference in specific gravity; The coated EP beads are discharged to the outside of the mixing vessel, while the uncoated or less coated EP beads are continuously mixed inside the mixing vessel, and the flame retardant coating of the EP beads is applied. Way. The method of claim 1, Said mixing vessel is characterized by the continuous blowing of air upwards from its bottom to help separate the flame retardant coated ES beads and the uncoated or less coated EP beads from each other. Flame retardant coating method of S-Bid. The method of claim 2, The air flows upward from the bottom of the mixing vessel while drying the flame retardant solution coated on the surface of the EP beads, flame retardant coating method of EP beads. The pre-foamed ES beads and the flame retardant solution were introduced into the mixing vessel, and the pre-foamed ES beads and the flame retardant solution were mixed to coat the flame retardant solution on the surface of the pre-foamed ES beads. In the method of letting a). A preparation step (S 110) of putting the EP beads into the mixing vessel of the EP beads and preparing for mixing; b). In order to coat the flame retardant on the injected EP beads, the flame retardant solution is transferred from the outside to the inside of the body portion 110 through the supply pipe 122, and the flame retardant solution is sprayed on the EP beads through the injection nozzle 124. Spraying the flame retardant solution (S 120); c). The inside of the body portion 110 is coated with the ES beads of the flame retardant solution, and the rotors coated with the flame retardant solution by the rotary blades and bumps each other not coated with the flame retardant solution, Coating the ES beads with the flame retardant solution, which is to be rubbed and uniformly coated with the flame retardant solution, and to separate them from each other for the EP beads not yet coated (S 130); d). Discharging the EP beads coated with the flame retardant solution out of the body portion (S 140); Flame retardant coating method of the PS beads, characterized in that it comprises a. The method of claim 4, wherein The coating step (S 130) of the flame retardant solution is carried out by separating them from each other using the difference between the specific gravity of the EP beads coated with the flame retardant solution and the specific gravity of the EP beads not yet coated with the flame retardant solution. 1, flame retardant coating method of EP beads. The method of claim 4, wherein After the discharge step (S 140), check whether the operation is terminated, if the end signal is received proceeds to the end step (S 150), if not received from the flame retardant injection step (S 120) A flame retardant coating method of EP beads, characterized in that it proceeds repeatedly. The method of claim 6, Repeatedly proceeding from the flame retardant spraying step (S 120) is characterized in that it proceeds repeatedly using the same mixing vessel, EP flame retardant coating method. The method of claim 6, Repeatedly proceeding from the flame retardant spraying step (S 120) is characterized in that to use two to eight body parts arranged, flame retardant coating method of EP beads. The method of claim 6, Repeatedly proceeding from the flame retardant spraying step (S 120) is characterized in that for using three to five body parts arranged, flame retardant coating method of EP beads. The method according to any one of claims 6 to 9, The flame retardant injection step (S 120) is characterized in that using a different flame retardant solution, flame retardant coating method of EP beads.

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