KR20180080755A - Flame retardant styrofoam produced by using flame retardant vinyl acetate polymer emulsion resin - Google Patents

Abstract

The present invention relates to a flame-retardant Styrofoam prepared by using a flame-retardant vinyl acetate polymer emulsion, which shows excellent adhesive strength and moldability and has significantly improved stability of polymer resin. According to the present invention, the flame-retardant Styrofoam prepared by using a flame-retardant vinyl acetate polymer emulsion comprises: a flame-retardant vinyl acetate polymer emulsion resin which is formed by a mixture containing a vinyl acetate monomer (VAM), an ethyl acrylate monomer (EAM), sodium lauryl sulfate (SLA), poly vinyl alcohol (PVA), an ammonia solution in which 27% ammonia is dissolved in water, potassium persulfate (KPS), and water; a flame-retardant coating agent which is formed by a mixture containing the flame retardant vinyl acetate polymer emulsion resin, expanded graphite, aluminum hydroxide, magnesium hydroxide, and water; and flame-retardant Styrofoam particles which are formed by coating Styrofoam particles with the flame-retardant agent and drying the Styrofoam particles to form a flame-retardant coating layer on the surface thereof. The flame-retardant Styrofoam of the present invention is prepared by molding the flame-retardant Styrofoam particles via thermo compression.

Description

FIELD OF THE INVENTION The present invention relates to a flame retardant styrofoam produced by using a flame retardant vinyl acetate polymer emulsion resin,

The present invention relates to a flame retarded styrofoam produced by using a flame-retardant vinyl acetate polymer emulsion having an excellent adhesive force and moldability and remarkably improving the stability of a polymer resin.

As is well known, Styrofoam is a brand name of a company that developed expanded polystyrene as a kind of plastic called expanded polystyrene, and is a polymer of styrene. Styrofoam is a colorless, transparent thermoplastic material that softens above 100 ° C, becomes a viscous liquid at around 185 ° C, and is resistant to acids, alkalis, oils, and alcohols. Styrofoam is a resource-saving material with 98% of its volume being air and the remaining 2% being resin. It is composed of a large amount of small air layer and absorbs little water. It is not damaged by bacteria or fungi, It is also used for toys and buoys, and has excellent barrier properties and is widely used as a thermal insulation material for construction.

A method of producing such a styrofoam will be briefly described. First, suspension polymerization is carried out with water containing a foaming agent (pentane or butane gas) in polystyrene, the polymer is again put into water, and the mixture is heated and stirred until a predetermined molecular weight Next, spherical styrofoam particles (beads) are produced, and then the styrofoam particles are washed, dried, and sorted, and then the styrofoam particles are molded by thermocompression to produce styrofoam in a desired shape and size.

However, such a styrofoam is a thermoplastic material, which is very weak to heat and is easily deformed when it exceeds 70 DEG C, so that it easily burns when a fire occurs, and generates a large amount of toxic gas when burned and has a problem in that its shape collapses easily.

Various methods for producing flame retardant styrofoam which does not burn well are proposed, and the following prior art documents are those listed in the prior art documents recently searched with the keyword "flame retardant * styrofoam ", and the following prior art documents The state of development of the technical field of the present invention and its background technology will be described in more detail.

Conventional prior art attempts to improve adhesive strength and formability by using two or more kinds of adhesives to mix or blend various binder resins in order to improve the adhesive strength. However, by using the adhesives having different properties, And problems such as separation phenomenon or gel phenomenon occurred in the blending process of the blend.

In addition, the adhesive applied to the EVA system had a problem in adhesion with the styrofoam having a strong hydrophobic property. In the case of an acrylic-based adhesive, since dispersibility of an inorganic material such as expanded graphite, aluminum hydroxide, and magnesium hydroxide added as a flame retardant is a problem, There is a problem that separation of the flame retardant occurs due to occurrence of separation phenomenon or the like.

Public / registration numbers: 1015846970000, 1020160147425, 1020160143137, 1020160112290.

The present invention has been developed in order to solve the conventional problems mentioned in the background art, and it is an object of the present invention to improve the compatibility of the adhesive applied to the binder and the miscibility with the additive, and to use the polyvinyl acetate- It is an object of the present invention to provide a flame retardant vinyl acetate polymer emulsion resin having excellent adhesion and moldability and improved stability of a polymer resin by preparing a copolymer resin in a copolymerized form.

Another object of the present invention is to provide a flame retardant coating composition comprising the flame retardant vinyl acetate polymer emulsion resin as a binder and a flame retardant coating agent prepared by mixing the flame retardant agent with the flame retardant agent. The flame retardant styrofoam particles are coated on the surface of the styrofoam particles, The present invention relates to a styrofoam-forming process for producing a styrofoam-coated styrofoam layer. The styrofoam-based styrofoam-coated styrofoam layer has excellent adhesion to a substrate, To improve the adhesion between the flame retardant styrofoam particles and the shape stability thereof, and to provide a flame retardant styrofoam which can withstand flame retardancy grade 3 by imparting flame retardancy to the flame retardant material. The present invention has been made to solve the above- have.

In order to solve the above-mentioned object, the present invention provides a method for producing an aqueous ammonia solution comprising vinyl acetate monomer (VAM), ethyl acrylate monomer (EAM), sodium lauryl sulfate (SLA), polyvinyl alcohol (Ammonia water), potassium persulfate (KPS), and water; Flame retarding coating comprising a mixture of the flame retardant vinyl acetate polymer emulsion resin, expanded graphite, aluminum hydroxide, magnesium hydroxide and water; Flame retardant styrofoam particles having a flame retardant coating layer formed on the surface of the styrofoam particles by coating the flame retardant clay on the styrofoam particles; Flame retardant styrofoam produced by molding the flame retardant styrofoam particles by thermocompression bonding.

According to the means proposed by the present invention, the flame-retardant vinyl acetate polymer emulsion resin is formed of a polymer resin in copolymerized form by using a mixture of a vinyl acetate monomer and an acrylic monomer, and is further provided with an emulsifier, an emulsion stabilizer, a polymerization stabilizer, (Polyvinylacetate-acrylic copolymer, PVAc), which is excellent in adhesion and moldability, and the stability of the polymer resin is remarkably improved.

The flame retardant styrofoam particles and the flame retardant styrofoam comprising the flame retardant vinyl acetate polymer emulsion resin can prevent cracking and cracking of the binder coating layer coated with the styrofoam particles by the flame retardant vinyl acetate polymer emulsion resin, The adhesive strength between the flame retardant and the styrofoam is improved so that the flame retardant coated on the surface of the styrofoam particles is prevented from being separated and dispersed and the styrofoam molding process has high adhesion strength and shape stability between the flameproof styrofoam particles, At the same time, the flame retardant styrofoam which is endowed with the flame retardancy by the flame retardant has the effect of enduring the flame retardant grade 3.

1 is a chemical structural diagram of a flame-retardant vinyl acetate polymer emulsion resin according to the present invention;
2 is a view showing the particle shape of the flame-retardant vinyl acetate polymer emulsion resin according to the present invention
Fig. 3 is a photograph showing the coating of the styrofoam particles according to the present invention
FIG. 4 is a photograph showing a cross section of a flame-retarded styrofoam granule according to the present invention
FIG. 5 is a photograph of a flame retardant styrofoam according to the present invention
Fig. 6 is a photograph showing the result of the experiment of flame retardant grade 3 of the flame retardant styrofoam according to the present invention

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the appended drawings may be exaggerated, omitted, or outlined for convenience of description, and the terms and names used in the description are intended to be implicitly construed according to the shape, And the description of the position will be described with reference to the drawings unless otherwise specified. And specific descriptions of well-known and commonly-used techniques may be omitted to avoid obscuring the subject matter, or to be omitted or replaced with a simple code or name.

Hereinafter, the flame retardancy Vinyl acetate polymer Emulsion  The flame retardant styrofoam produced by using the resin will be described as follows.

The flame retardant styrofoam produced by using the flame retardant vinyl acetate polymer emulsion resin according to the present invention can be used as flame retardant vinyl acetate polymer emulsion resin; A flame retardant clay produced by using the flame retardant vinyl acetate polymer emulsion resin; Flame retardant styrofoam particles produced by using the flame retardant coating; And made of flame retardant styrofoam produced by using the flame retardant styrofoam particles.

First, Vinyl acetate polymer Emulsion  The resin is described as follows.

The flame retardant vinyl acetate polymer emulsion resin comprises 32 to 35% of vinyl acetate monomer (VAM), 5 to 8% of ethyl acrylate monomer (EAM), 2 to 4% of sodium lauryl sulfate (SLA) ), Ammonia solution (ammonia water) 0.1 to 0.2%, potassium persulfate (KPS) 0.2 to 0.4% and water 50 to 53% dissolved in water to 2 to 4% and 27%

The above-mentioned VAM and EAM serve as an adhesive as a monomer as a polymer adhesive resin, and the group of SLA, PVA, ammonia water and KPS described above serves as a polymerization auxiliary agent for emulsion polymerization with a binder. More specifically, SLA is an emulsifier And PVA acts as an emulsifying stabilizer. Ammonia water acts as a polymerization stabilizer and pH adjusting agent, and KPS acts as an initiator. And the above-mentioned water serves to control the heat of polymerization.

The above mixture has a chemical structure of the form as shown in FIG. 1 and shows the structure of the particle type as shown in FIG. That is, the surface is composed of a stable emulsion resin composition in which the PVA and the emulsifier are oriented and the inside is formed of a polymer resin.

Hereinafter, Vinyl acetate polymer Emulsion  Of resin Manufacturing method  The following is an explanation.

The above-mentioned production method of the flame retardant vinyl acetate polymer emulsion resin is carried out by dividing the process for producing the adhesive and the process for producing the polymerization auxiliary, and then proceeding to polymerize the adhesive and the polymerization auxiliary.

For this purpose, a main reactor equipped with a paddle-type agitator and a secondary reactor are prepared, and a reaction device for emulsion polymerization is provided in which the reactants of the secondary reactor can be constantly injected into the main reactor.

A polymerization auxiliary agent is prepared in the main reactor described above, a monomer is fed into the auxiliary reactor, and a monomer for the auxiliary reactor is added to the polymerization auxiliary prepared in the main reactor to perform polymerization.

The main reactor was charged with 140 to 160% of water relative to the weight of the monomer and agitated at a stirring speed of 40 to 50 rpm while adding 3 to 5% of an emulsifier, sodium lauryl sulfate, and 3 to 5% of an emulsion stabilizer, PVA After the temperature is raised to 80 ° C, the mixture is stirred until the charge is completely dissolved.

During the dissolution of the main reactor, 80 to 90% of vinyl acetate monomer and 10 to 20% of ethyl acrylate are added to the auxiliary reactor, and the monomer is prepared by stirring until the mixture is completely mixed.

If the main reactor is completely dissolved during the mixing of the contents of the auxiliary reactor, the reactor is maintained at 68 to 72 ° C, and 27% of ammonia is dissolved in the polymerization stabilizer and the pH adjuster, 0.3 to 0.5% of ammonia solution, 0.5 to 1% of KPS as an initiator is added, and the mixture is stirred until the mixture is completely mixed to complete the preparation of the polymerization auxiliary agent.

When the preparation of raw materials for the main reactor and the auxiliary reactor is completed, emulsion polymerization is carried out while slowly stirring the monomers of the auxiliary reactor while constantly maintaining the internal temperature of the main reactor.

When the above-mentioned input and emulsion polymerization reaction is sufficiently carried out, the aging reaction is carried out while maintaining the inner temperature of the main reactor at 70 to 75 ° C.

When the aging reaction is completed, the reaction product in the main reactor is sufficiently cooled. When cooling is completed, distilled water is added so that the solid content is 40%, the pH is 6 to 8, and the viscosity is 500 to 1000 cps to prepare the final flame retardant vinyl acetate polymer emulsion resin .

The structure of the flame retardant vinyl acetate polymer emulsion resin produced by the above-described production method is a copolymer resin composition of the form as shown in Fig. 1, and the structure of the particle type is as shown in Fig. 2, in which the PVA and the emulsifier are oriented on the surface, Is formed of a stable emulsion resin composition formed of a polymer resin.

Hereinafter, the flame retardancy Vinyl acetate polymer Emulsion  The flame-retardant coating that is produced using the resin will be described as follows.

The above-mentioned flame retardant clay is a mixture containing 40 to 50% of flame retardant vinyl acetate polymer emulsion resin, 20 to 30% of expanded graphite, 5 to 10% of aluminum hydroxide, 5 to 10% of magnesium hydroxide and 10 to 20% .

The particle size of expanded graphite is preferably 80 to 120 mesh, and the particle size of aluminum hydroxide and sodium hydroxide is preferably 5 to 20 占 퐉.

The flame retardant clay is produced by charging the above flame retardant vinyl acetate polymer emulsion resin into a reactor equipped with a high-speed agitator, slowly adding expanded graphite to the mixture while agitating the mixture, thoroughly mixing magnesium hydroxide and aluminum hydroxide After the addition, water was added until the physical properties were 55 to 60% of solids, 500 to 1000 cps of viscosity, and pH of 8 to 12 to adjust the viscosity and solids content, Can be produced.

Hereinafter, flame retardant styrofoam granules produced using the flame-retardant cloning will be described.

The above-mentioned flame retardant styrofoam granules are prepared by injecting the final styrofoam granules prepared by a usual production method into one side of a tube conveyed by a screw, supplying the resulting styrofoam granules to the other side, A coating agent is supplied to the inside of the tube to coat the surface of the styrofoam particles with the flame-retardant coating agent mixed and agitated, and then the outlet of the tube body is connected to the drum-type air-blowing drying chamber and then supplied to the stove- The granules are blown, stirred, and dried to produce the final flame retarded styrofoam granules coated with the flame retardant coating material on the surface of the styrofoam granules.

The outer shape of the flame retardant styrofoam particles thus produced is as shown in Fig. 3, and the cross-sectional shape thereof is shown in Fig.

Hereinafter, the flame retardant styrofoam produced using the flame retardant styrofoam particles will be described as follows.

The above-mentioned flame retardant styrofoam can be produced by the conventional injection molding method using the above-mentioned flame retardant styrofoam particles or through a molding process by thermo compression bonding by an extrusion method, and the final flame retardant styrofoam can be produced in a desired shape.

The outline of the flame retardant styrofoam thus manufactured is shown in Fig. 5, and the flame retardancy grade 3 is experimentally measured using the flame retardant styrofoam.

Hereinafter, the flame retardancy Vinyl acetate polymer Emulsion  Resin, the flame retardant clay produced by using the resin, the flame retardant styrofoam manufactured using the clay, and the flame retardant styrofoam produced using the flake, and the action and effect thereof will be described below.

First, the above-mentioned flame retardant vinyl acetate polymer emulsion resin is prepared by emulsion polymerization of vinyl acetate and acrylic in the form of copolymer, and the protective colloid and the emulsifier are appropriately combined into one particulate form to provide an adhesive force and stability Lt; / RTI >

Since the flame retardant vinyl acetate polymer emulsion resin has a vinyl group and an acryl group in a single polymer chain, it improves the bonding force and binding force between the flame-retardant inorganic material and the styrofoam, and the properties are well adhered to the surface of the styrofoam particles, . Among them, the acrylic resin plays a role of making the coating layer hard and firm, and the polyvinyl acetate resin plays a role of stabilizing the coating layer by preventing the coating layer from cracking or cracking by imparting ductility to the coating layer do.

The blending ratio of the above-mentioned flame retardant vinyl acetate polymer emulsion resin is considerably important in forming the final physical properties. If the blending ratio of VAM is less than the reference value, there is a problem that the final coating layer breaks easily or cracks occur. There is a problem in that the strength of the coating layer is lowered. When the mixing ratio of the EAM is less than the reference value, the strength of the coating layer is lowered. On the other hand, The emulsion polymerization stabilization, the polymerization stabilization, the pH adjustment and the initiation of the stabilization are unstable, and the flame retardant is easily peeled off. Therefore, it is preferable to mix them as close as possible to the above-mentioned mixing ratio.

In the flame-retardant cladding, the flame retardant is used for exerting a flame-retardant function and serves to prevent external heat and flame from being transmitted to the inside, thereby preventing the styrofoam particles from being melted. Among them, the expanded graphite expands the graphite in the process of rising temperature by the external heat to form a film, and blocks external air from flowing into the graphite, The magnesium hydroxide acts to block heat due to the formation of water by pyrolysis at about 300 ° C and decomposition residues of these components are present on the surface as remnants, The ash coating protects the coating layer at high temperatures and serves to block heat.

When the blending ratio of the flame retardant in the flame-retardant cladding is lower than the reference value, it is difficult to form a film, so that the outside air easily flows into the inside and the heat shield is lowered. There is a problem that the weight becomes heavy and it becomes difficult to form from styrofoam granules to styrofoam. When the mixing ratio of aluminum hydroxide and sodium hydroxide is below the standard value, heat is easily transmitted to the inside and the overall flame retardancy is deteriorated. There is a problem in that the production cost increases as well as the weight becomes heavy and it becomes difficult to form styrofoam from the styrofoam grains. Therefore, it is preferable to mix them as close as possible to the above-mentioned mixing ratio.

In addition, the particle size of the flame-retardant coating is very important in forming the final physical properties of the flame-retardant coating layer. When the particle size of the expanded graphite is below the reference value, the film becomes difficult to form. If the particle size of the aluminum hydroxide and sodium hydroxide is below the standard value, the water generation due to pyrolysis is too rapid and the flame retarding ability is deteriorated. If the particle size of the aluminum hydroxide and the sodium hydroxide is lower than the reference value, water generation due to pyrolysis is too slow, There is a problem that the styrofoam particles are melted. Therefore, it is preferable to select the particle size as close as possible to the above-mentioned particle size.

Hereinafter, an embodiment of a method for producing a flame-retardant vinyl acetate polymer emulsion resin according to the present invention will be described.

In a 1 L five-necked flask equipped with a reflux condenser, 150.0 g of industrial water was added, 3.0 g of emulsifier Sodium persulfate and 5.0 g of PVA as an emulsion stabilizer were added while stirring at a stirring speed of 40 to 50 rpm, Deg.] C and sufficiently stirred for 1 hour to completely dissolve the contents. While the above contents are dissolved, 90.0 g of vinyl acetate monomer and 10.0 g of ethylacrylate monomer are added to a 500 ml separatory funnel and stirred sufficiently. When the above process is completed, the inner temperature of the five-necked flask is maintained at 68 to 72 ° C., 0.3 g of a polymerization stabilizer and a 27% ammonia solution as a pH adjuster are added, 0.5 g of KPS as a initiator is added thereto, While emulsion polymerization is carried out while the monomer mixture in the separating funnel is continuously fed for 3 hours. When the above-mentioned reaction is completed, aging reaction is carried out for 3 hours while keeping the internal temperature at 70 to 75 ° C. When the reaction is completed, sufficiently cool, add 10.0 g of distilled water, adjust to 40% solids, and store separately.

Comparative Examples 1 to 3 were produced by adjusting the amount of the emulsifier and the emulsifier stabilizer in the synthesis of the polymer resin by the process of Example 1, and the results are shown in Table 1 below.

division Ingredients Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 1 L 5-neck reactor Water 150 150 150 150 SLS ⁽¹⁾ 3.0 0.0 3.0 3.0 PVA ⁽²⁾ 5.0 5.0 0.0 5.0 KPS ⁽³⁾ 0.5 0.5 0.5 0.5 pH Buffer ⁽⁴⁾ 0.3 0.3 0.3 0.0 500 ml separator VAM 90 90 90 90 EAM 10 10 10 10 Cooling Water 10 10 10 10

(1): Sodium lauryl sulfate (anionic surfactant)

(2): Poly vinyl alcohol (MW; 500)

(3) Potassium persulfate (initiator)

(4): 27% Ammonia solution

As shown in Table 1, the vinyl acetate polymer resin is comparatively good in terms of vinyl acetate single polymerization, but monomers of acryl system, especially methyl methacrylate, butyl acrylate and ethyl acrylate, are difficult to synthesize because of the difference in reaction rate constant It is often polymerized in the form of each homopolymer. Therefore, it can be seen that the addition of emulsifier, stabilizer, and pH buffer agent is an important parameter in the copolymerization process.

In the case of Comparative Example 1, when the emulsifier SLS was not added, the reaction proceeded well at the initial stage, but after the monomer introduction of about 80%, the viscosity increased and the synthesis proceeded unevenly due to separation from the monomer and polymer particles. After the completion of the reaction, unreacted monomers were present in excess, and some monomer separation was observed in the upper layer. In Comparative Example 2, when PVA functioning as a protective colloid or emulsion stabilizer was not used, the reaction proceeded well at the beginning of synthesis, but after the addition of about 50% of the monomers, the stability became poor and the gel became a gel due to the emulsion particle breakage during the reaction. In Comparative Example 3, when the pH buffer agent was not used, the reaction proceeded well until all the monomers were added. It was observed that the monomer addition was terminated and the viscosity was slightly increased during the aging process. The synthetic form is good but the viscosity is elevated, which is thought to be due to unstability of emulsion stability during aging. When the viscosity of the polymer resin is excessively increased, problems such as miscibility in the process of mixing the inorganic flame retardant and lack of surface coatability of the styrofoam poles due to an increase in viscosity of the final flame retardant resin composition may occur.

Therefore, it can be seen from Example 1 and Comparative Examples 1 to 3 that the polymerization of the polymer resin in the present invention is a very important factor for the emulsifier, the emulsion stabilizer and the pH stabilizer.

Hereinafter, the flame retardancy Vinyl acetate polymer Emulsion  An embodiment according to a method for producing a flame-retardant coating using a resin will be described as follows.

In a 1 L stainless beaker type reactor equipped with a high-speed stirrer, 100 g of polyvinylacetate copolymer resin synthesized in Example 1 was added, and 50 g of expanded graphite was slowly added thereto while stirring at 500 rpm. The mixture was stirred for 5 minutes to be completely dispersed 15 g of magnesium hydroxide, and 15 g of aluminum hydroxide were charged into the flask, and the mixture was stirred at 1000 rpm for 10 minutes at high speed to completely disperse. 20 g of industrial water was added thereto to prepare a flame retardant composite resin by controlling viscosity and solid content.

Comparative Examples 4 to 7 were prepared by changing amounts of expanded graphite, polymer resin and inorganic additive in the production of flame-retardant clay by the process of Example 2. 28 g of flame retardant clay was mixed with 20 g of styrofoam granules, The flame retardant grade 3 was evaluated by the method of KS M 2001, which was prepared by styrofoam, which was subjected to dehydration drying and molding after being charged into a tetrahedral mold having a size of 10 cm × 10 cm × 5 cm in width, height and height, respectively.

Ingredients Example 2 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Polymeric resins ⁽¹⁾ 100 100 100 90 130 Expanded graphite 50 35 65 50 50 Magnesium hydroxide 15 25 10 15 15 Aluminum hydroxide 15 20 5 15 15 Water 20 20 20 20 20

(1): The polymer resin prepared in the synthesis of Example 1

As shown in Table 2, the composition of Example 2 showed a very homogeneous residual characteristic in the residue characteristics, and the remaining residues in Comparative Examples 4 to 7 were out of specification or cracks were observed. The results of the residual characteristics of Example 2 are shown in Fig.

Therefore, it can be seen from Example 2 and Comparative Examples 5 to 7 that the amount of the expanded graphite, the polymer resin, and the inorganic additive is a very important factor for determining the flame retardancy of the final styrofoam.

Hereinafter, a configuration that can be added to the present invention will be described.

In the manufacturing process of the flame-retardant vinyl acetate polymer emulsion resin according to the present invention, 2 to 4% of ethylene-vinyl acetate copolymer (EVA) may be added at the time of introduction of PVA. EVA added in this way adds viscosity to the entire mixture, thereby further stabilizing the flame retardant vinyl acetate polymer emulsion resin.

Further, 1 to 2% of calcium carbonate having a particle size of 5 to 10 탆 can be further added to the step of introducing the flame retardant in the production process of flame-retardant cladding according to the present invention. The calcium carbonate thus added is made of the final flame retardant styrofoam and is formed when the ash is burned. The ash is formed as a film on the surface, and the external heat acts to flow into the inside, thereby preventing the heat from diffusing, There is an effect that makes it possible.

Hereinafter, an application according to the constitution and the manufacturing method of the present invention will be described as follows.

In order to facilitate understanding of the principles and principles of the production method to be pursued in the present invention, the present invention selects constituents contained in the present invention and shows a preferable mixing ratio and particle size for the constituents, The components included in the manufacturing method may be selected in consideration of the principle to be pursued in the present invention, and the mixing ratio may be variously changed according to the components. The constituent elements included in the manufacturing method proposed in the present invention can be exemplified by the effects which the person skilled in the art would like to obtain in the present invention and which principle is most preferably applied to obtain applicable effects from the effects. It is. Accordingly, it is most preferable to complete the present invention including all of the components included in the manufacturing method proposed by the present invention. However, it is preferable that the present invention is implemented by considering the principle, use, function, role, The manufacturing can be completed by selecting or excluding some of the various components depending on cost reduction, manufacturing convenience, environmental condition, or need, and may be optionally completed in parallel. Based on this, the present invention specifically requests the scope of the claim to the extent as broadly as the claims.

It will be apparent to those skilled in the art that the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment of the invention, It will increase the efficiency of use as well as the power generation.

Claims (1)

vinyl acetate monomer (VAM), ethyl acrylate monomer (EAM), sodium lauryl sulfate (SLA), poly vinyl alcohol (PVA), ammonia solution containing 27% ammonia in water, potassium persulfate (KPS) A flame-retardant vinyl acetate polymer emulsion resin;
Flame retarding coating comprising a mixture of the flame retardant vinyl acetate polymer emulsion resin, expanded graphite, aluminum hydroxide, magnesium hydroxide and water;
Flame retardant styrofoam particles having a flame retardant coating layer formed on the surface of the styrofoam particles by coating the flame retardant clay on the styrofoam particles;
The flame-retarded styrofoam produced by using the flame-retardant vinyl acetate polymer emulsion resin is produced by molding the flame-retardant styrofoam particles by thermocompression bonding.

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