KR101528739B1 - Binder for fire retardant expanded polystyrene and method for producing fire retardant expanded polystyrene molded articles using the same - Google Patents

Abstract

A binder for flame-retardant expanded polystyrene and a method for producing flame-retardant expanded polystyrene molded articles using the same are provided to improve flame retardancy, moldability, and productivity. The binder comprises: 10 to 50 wt% of one or more compounds selected from compounds including at least one of alcohol, an ester group, and an amino group; 0.01 to 0.5 wt% of a silane coupling agent; 0.1 to 5 wt% of polyhydric alcohol; and 45 to 89 wt% of solvent.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a binder for a flame-retardant expanded polystyrene and a method for producing a flame retardant expanded polystyrene molded article using the same,

The present invention relates to a binder for a flame-retardant foamed polystyrene and a method for producing a flame-retarded foamed polystyrene molding using the binder. More specifically, the present invention relates to a binder capable of forming a flame-retardant functional skin coated on expanded polystyrene particles, To a process for producing the same.

Recently, various methods have been proposed to enhance the flame retardancy of expanded polystyrene used in sandwich panels and the like. In the past, as a binder, vinyl acetate, ethylene vinyl acetate, acrylate monomer, Similarly, since a thermoplastic resin having a melting point lower than that of polystyrene is used, the conventional binder can not improve the flame retardancy. Further, since the conventional binder is used by necessity to adhere aluminum hydroxide, expanded graphite and halogen elements known as flame retardant inorganic substances, when coated on polystyrene, a large amount of an inorganic additive is added to the coating agent, resulting in poor moldability.

That is, in order to exhibit high functionality such as flame retardancy, a flame retardant coating agent is prepared by adding a flame-retardant inorganic material in an amount substantially equal to the amount of the binder, and then coated on the surface of the prefoamed expanded polystyrene particles to form a resin coating layer (functional skin layer) And the foamed molded product is obtained through a steam heating foaming process. In the steam heating foaming process, since the resin mixture applied by a large amount of the inorganic additive is leached by steam, it is difficult to smoothly penetrate the inside of the steam, Since the inorganic additive absorbs the condensed water generated in the vacuum cooling step to lower the adhesive force between the foamed polystyrene particles, the molding defects such as cracks, defective internal fusing and distortion due to shrinkage are somewhat higher There has been a problem in productivity.

An object of the present invention is to provide a binder for a flame-retardant expanded polystyrene capable of imparting excellent flame retardancy, moldability and productivity, and a method for producing a molded article of a flame-retardant expanded polystyrene using the same.

In order to attain the above object, the present invention provides a composition comprising 10 to 50% by weight of at least one compound selected from compounds containing at least one of an alcohol group, an ester group and an amino group; 0.01 to 0.5% by weight of a silane coupling agent; 0.1 to 5% by weight of polyhydric alcohol; And 45 to 89% by weight of a solvent for a flame-retardant foamed polystyrene.

In the present invention, the compound containing alcohol group is polyvinyl alcohol, the compound containing ester group is at least one selected from vinyl acetate and acrylic compound, and the compound containing amino group is monoethanolamine, triethanolamine, urea and melamine It may be at least one selected.

In the present invention, the silane coupling agent may be at least one compound selected from compounds represented by the following general formula (1).

[Chemical Formula 1]

RSi (R ') ₃

In the above formula, R is an alkyl group having 1 to 10 carbon atoms with or without nitrogen, and R 'may be a methoxy group, an ethoxy group or an acetoxy group.

In the present invention, the polyhydric alcohol may be at least one selected from glycerin, ethylene glycol and diethylene glycol.

In the present invention, the solvent may be at least one selected from water and alcohols.

The present invention also relates to a binder composition comprising 10 to 50% by weight of at least one compound selected from compounds containing at least one of an alcohol group, an ester group and an amino group, 0.01 to 0.5% by weight of a silane coupling agent, 0.1 to 40% by weight of a polyhydric alcohol By weight to 5% by weight of a solvent and 45 to 89% by weight of a solvent to prepare a flame retardant binder; Preparing a flame-retardant coating agent by mixing 50 to 90% by weight of a flame-retardant binder and 10 to 50% by weight of a flame-retardant inorganic material with respect to the total weight of the flame-retardant coating agent; Mixing 1,000 parts by weight of expanded polystyrene particles and 500 to 2000 parts by weight of a flame retardant coating agent to coat the expanded polystyrene particles with a flame retardant coating agent; Mixing 1 to 100 parts by weight of a curing agent with respect to 1000 parts by weight of the expanded polystyrene particles, followed by drying to form expanded polystyrene particles having a flame-retardant skin layer; And forming a flame-retarded expanded polystyrene molding by molding expanded polystyrene particles having a flame-retardant skin layer. The present invention also provides a method for producing a flame-retarded expanded polystyrene molding.

In the present invention, the flame-retardant inorganic material may be at least one selected from aluminum hydroxide, calcium carbonate, expanded graphite, silicate compounds and non-halogen compounds.

In the present invention, the curing agent may be at least one selected from compounds containing at least one of an isocyanate group and an epoxy group.

The binder according to the present invention is excellent in flame retardancy and can satisfy the flame retardancy even when a small amount of the flame retardant inorganic material is used, and the moldability and productivity of the molded article of the flame retardant expanded polystyrene can be improved.

Fig. 1 is a photograph of the molded article of the flame-retarded expanded polystyrene produced in Example 1. Fig.
2 is a photograph of the molded article of the flame-retarded expanded polystyrene produced in Example 2. Fig.
Fig. 3 is a photograph of the molded article of the flame-retarded expanded polystyrene produced in Example 3. Fig.
4 is a photograph of the molded article of the flame-retarded expanded polystyrene produced in Comparative Example 1. Fig.

Hereinafter, the present invention will be described in detail.

The present invention relates to a binder for a flame-retardant expanded polystyrene and a method for producing a flame-retarded expanded polystyrene molding using the same.

Flame retardant binder

The binder for the flame-retarded expanded polystyrene according to the present invention may be composed of a substance containing an alcohol group or the like, a silane coupling agent, a polyhydric alcohol, a solvent, etc. Specifically, it is selected from compounds containing at least one of an alcohol group, an ester group and an amino group From 10 to 50% by weight of at least one compound; 0.01 to 0.5% by weight of a silane coupling agent; 0.1 to 5% by weight of polyhydric alcohol; And 45-89 wt% of solvent.

1. Alcohol group, ester group and / or amino group-containing compound

At least one compound selected from a compound (or a monomer) containing at least one of an alcohol group (-OH), an ester group (-COO-) and an amino group (-NH ₂ ) is a main component of a binder, (Or monomers) selected from compounds containing at least one of an isocyanate group (-NCO) as a curing agent and an epoxy group to form a copolymer. Since all of the above compounds contain active hydrogen and have good reactivity, they can cross-link or cross-link with epoxy groups or isocyanate groups to improve heat resistance.

As the compound containing an alcohol group, polyvinyl alcohol and the like can be used. As the compound containing an ester group, vinyl acetate, an acrylic compound or the like may be used alone or in combination of two or more. As the acrylic compound, acrylic acid, methacrylic acid, methyl methacrylate, 2-hydroxyethyl methacrylate, etc. may be used alone or in combination of two or more. As the compound containing an amino group, monoethanolamine, triethanolamine, urea, melamine, etc. may be used alone or in combination of two or more.

The reactive materials having active hydrogen may react as follows. Therefore, a binder excellent in flame retardancy can be produced, and a flame retarding function can be satisfied even when a small amount of flame retardant inorganic material is coated on the surface of expanded polystyrene particles.

[Reaction Scheme 1]

-COOH + R-OH - - COOR + H ₂ O

At least one compound selected from compounds containing at least one of an alcohol group, an ester group and an amino group may be contained in an amount of 10 to 50% by weight based on the total weight of the binder. If the content of the compound is too low, the adhesive strength and flame retardancy may be deteriorated. If the content of the compound is too high, the viscosity of the resin may become too high and it may become difficult to work.

2. Silane coupling agent

The silane coupling agent may be used to assist in fusion with the flame retardant inorganic material. Silane coupling agents are silicon-based chemicals that contain two different reactors, organic and inorganic, in the same molecule, and can act as contacts in the middle for the bonding of different materials, including flame retardant inorganic materials and organic materials. have.

Particularly, silane coupling agents including methoxy, ethoxy and acetoxy have a property of binding well to metal hydroxyl groups (especially when the materials include silicon, aluminum, and heavy metals) on the surface of most inorganic materials, Is hydrolyzed with remaining water on the inorganic surface to form a silanol group. The silanol group is bonded to the metal hydroxyl group of the inorganic metal surface to remove moisture, thereby being effective in preventing corrosion of the metal.

Silane coupling agents can enhance adhesion to materials added as a flame retardant agent, and disperse hydrophobic inorganic powders in organic polymers and liquids to improve dispersibility. The organic group in the silane may be a reactive organic group (e.g., an organic functional group) or a non-reactive organic group, and the organic group may be hydrophobic and hydrophilic, with a change in thermal stability characteristics. The alkoxysilane can react with the free polymer to attach a trialkoxysilyl group to the backbone of the polymer. The silane reacts with moisture to form a stable three-dimensional siloxane structure while crosslinking, thereby enhancing the durability, water resistance, and heat resistance of organic resins such as acrylic and urethane.

As the silane coupling agent, at least one selected from compounds represented by the following general formula (1) can be used.

[Chemical Formula 1]

RSi (R ') ₃

In the above formula, R is an alkyl group having 1 to 10 carbon atoms with or without nitrogen, and R 'may be a methoxy group, an ethoxy group or an acetoxy group.

Preferably, (N, N-diethylaminomethyl) trimethoxysilane, methyltriethoxysilane and the like may be used alone or in combination of two or more as the silane coupling agent. The silane coupling agent may be contained in an amount of 0.01 to 0.5% by weight based on the total weight of the binder. If the content of the silane coupling agent is too low, the adhesive strength with the flame-retardant inorganic material may be deteriorated, and if too large, the silane coupling agent may be uneconomical.

3. Polyhydric alcohol

The polyhydric alcohol has a higher boiling point than water and can improve the water resistance of the formed film (skin layer) after the binder is dried. As polyhydric alcohols, glycerin, ethylene glycol, diethylene glycol, and the like may be used alone or in combination of two or more.

The polyhydric alcohol may be contained in an amount of 0.1 to 5% by weight based on the total weight of the binder. If the content of the polyhydric alcohol is too low, the water resistance of the film may deteriorate. If the content is too high, the adhesion of the foamed styrene may be deteriorated.

The silane coupling agent and the polyhydric alcohol can be mixed into the flame retardant binder before they are finally polymerized.

4. Solvent

As the solvent, any one selected from water and alcohols or a mixture of two or more kinds of solvents may be used. The content of the solvent may be from 45 to 89% by weight based on the total weight of the binder.

The binder composition is in the form of a solution containing solids, and the solids concentration of the binder excluding the solvent may be 3 to 80% by weight.

Manufacturing method of flame-retardant expanded polystyrene moldings

The present invention also provides a method for producing a molded article of a flame-retarded expanded polystyrene, wherein the production method comprises a step of mixing at least one compound selected from compounds containing at least one of an alcohol group, an ester group and an amino group, 0.01 to 0.5% by weight of a silane coupling agent, 0.1 to 5% by weight of a polyhydric alcohol, and 45 to 89% by weight of a solvent to prepare a flame retardant binder; Preparing a flame-retardant coating agent by mixing 50 to 90% by weight of a flame-retardant binder and 10 to 50% by weight of a flame-retardant inorganic material with respect to the total weight of the flame-retardant coating agent; Mixing 1,000 parts by weight of expanded polystyrene particles and 500 to 2000 parts by weight of a flame retardant coating agent to coat the expanded polystyrene particles with a flame retardant coating agent; Mixing 1 to 100 parts by weight of a curing agent with respect to 1000 parts by weight of the expanded polystyrene particles, followed by drying to form expanded polystyrene particles having a flame-retardant skin layer; And forming a flame-retarded expanded polystyrene molding by molding expanded polystyrene particles having a flame-retardant skin layer.

5. Flame Retardant Coatings

The flame-retardant coating agent may be prepared by mixing a flame-retardant binder with a flame-retardant inorganic material, and the content of the flame-retardant binder in the flame-retardant coating agent may be 50 to 90 wt%.

6. Flame-retardant inorganic

As the flame-retardant inorganic substance, aluminum hydroxide, calcium carbonate, expanded graphite, silicate compounds, non-halogen compounds and the like may be used alone or in combination of two or more. The average particle size of the flame-retardant inorganic material may be 5 to 10 mu m.

The content of the flame-retardant inorganic material may be 10 to 50% by weight based on the total weight of the flame-retardant coating agent. If the content of the flame-retardant inorganic material is too small, the flame retardancy may be deteriorated.

7. Hardener

The curing agent reacts with the functional group of the binder to cure it, and can perform an equivalent reaction with the active hydrogen in the binder. As the curing agent, at least one selected from compounds containing at least one of an isocyanate group and an epoxy group can be used. As the isocyanate compound, methylene diphenyl diisocyanate (MDI), toluene diisocyanate (TDI) and the like may be used alone or in combination of two or more. As the epoxy resin, bisphenol A type epoxy resin emulsion available from Kukdo Chemical Co., Ltd. can be used alone or in combination of two or more. The curing agent may be mixed with the flame retardant coating agent and expanded polystyrene and finally mixed.

The content of the hardener may be 1 to 100 parts by weight based on 1000 parts by weight of the flame retardant coating agent (flame retardant binder + flame retardant inorganic material) or expanded polystyrene particles. If the content of the curing agent is too small, the effect of increasing the heat resistance may be deteriorated. If the content of the curing agent is too high, gas may be generated at the time of heat bonding, and adhesion may be lowered during molding.

[Example 1]

1) 500 g of water and 50 g of polyvinyl alcohol were placed in a reactor equipped with a stirrer, a condenser, a nitrogen gas introducing tube, an initiator and a monomer inlet, and a thermostatted water bath, and while stirring under heating at 80 캜, a vinyl acetate monomer 200 g of acrylic acid and 200 g of acrylic acid were added dropwise over 2 hours, 200 g of distilled water was added to the reactor, the temperature was adjusted to 75 캜 while nitrogen was being replaced, and stirring was continued for 2 hours. Thereafter, 0.6 g of (N, N-diethylaminomethyl) trimethoxysilane was uniformly blended for 2 hours. After the reaction product was allowed to stand at 80 DEG C for 2 hours, 20 g of monoethanolamine and 2 g of ethylene glycol were added to obtain 1.1726 kg of a flame retardant binder (solid content: about 40%).

(2) 1 kg of foamed expanded polystyrene particles were foamed by foaming at an average 100 times in a ribbon mixer having a capacity of 100 L, and then 800 g of the flame retardant binder prepared in the above (1) and 200 g of aluminum hydroxide were added while stirring at a speed of 50 rpm, The resin solution was uniformly applied to the expanded particles by operating the ribbon mixer for 2 minutes to obtain 2 kg of the expandable polystyrene particles coated with the flame retardant resin solution.

(3) Stirring was continued for about 10 seconds while warm air was being applied to the ribbon mixer at a temperature of 60 캜, and then 50 g of a water-soluble epoxy emulsion (Kido Chemical KEM-134-60) was added with stirring to prepare a coating with a flame- retardant acrylic- To make expanded polystyrene particles. Thereafter, it was dried to obtain expandable polystyrene particles having a skin layer having a flame-retarding property.

(4) The expandable polystyrene particles having the flame retardant skin layer obtained in the above (3) were placed in a steam molding machine for EPS, heated at a steam pressure of 0.5 kg / cm3 for 1 minute, kneaded for 10 seconds and cooled to obtain a flame retardant A foamed polystyrene molding was prepared.

⑤ Flame retardant performance test

The flame-retardant foamed polystyrene molding obtained in the above step (4) was cut into a plate having a width of 2 cm, a length of 2 cm and a thickness of 1 cm and used as a sample for flame retardancy test. The specimens were exposed to a flame of 5 cm in length formed in a Bunsen burner for 1 minute to test the flame retardant performance. As a result of the test, heat and flame were blocked by the flame-retardant skin layer, so that the foamed polystyrene particles coated with the flame-retardant skin layer retained the skeleton and maintained its shape.

[Example 2]

1) Into a reactor equipped with a stirrer, a condenser, a nitrogen gas introducing tube, an initiator and a monomer inlet, and a thermoregulated water tank, 500 g of methanol, 180 g of methyl methacrylate monomer, 50 g of 2-hydroxyethyl methacrylate, g, and then 0.6 g of methyltriethoxysilane was uniformly mixed while stirring and heating at 70 占 폚. 200 g of methanol was added to the reactor, the temperature was adjusted to 70 캜 while replacing nitrogen, and stirring was continued. The reaction product was allowed to stand at 70 캜 for 2 hours, and then 2 g of glycerin was added thereto to obtain about 1 kg of a flame retardant binder (solid content of about 30%). Then, 200 g of calcium carbonate particles having an average particle size of 7.5 mu m was added to 800 g of the flame-retardant binder and uniformly dispersed to obtain 1.0 kg of a flame retardant coating agent.

(2) Put 1 kg of dried expanded polystyrene particles by foaming at an average of 100 times in a ribbon mixer having a capacity of 100 L, adding 1 kg of the flame retardant coating agent prepared in the above (1) while stirring at a speed of 50 rpm, And the coating agent was uniformly applied to the expanded particles to obtain 2 kg of flame-retardant expandable polystyrene particles.

After stirring the ribbon mixer at a temperature of 60 占 폚 for about 10 seconds while heating the mixture at a temperature of 60 占 폚, 50 g of MDI was added with stirring to prepare expandable polystyrene particles coated with flame retardant methyl methacrylate-isocyanate resin, Of the foamed polystyrene particles having a skin layer.

(4) The expandable polystyrene particles having the flame retardant skin layer obtained in the above (3) were placed in a steam molding machine for EPS, heated at a steam pressure of 0.5 kg / cm3 for 1 minute, kneaded for 10 seconds and cooled to obtain a flame retarded foam having a density of 25 kg / A polystyrene molding was prepared.

⑤ Flame retardant performance test

The flame-retardant foamed polystyrene molding obtained in the above step (4) was cut into a plate having a width of 2 cm, a length of 2 cm and a thickness of 1 cm and used as a sample for flame retardancy test. The specimens were exposed to a flame of 5 cm in length formed in a Bunsen burner for 1 minute to test the flame retardant performance. As a result of the test, heat and flame were blocked by the flame-retardant skin layer, so that the foamed polystyrene particles coated with the flame-retardant skin layer retained the skeleton and maintained its shape.

[Example 3]

1) 500 g of water, 200 g of vinyl acetate monomer, and 200 g of acrylic acid were placed in a reactor equipped with a stirrer, a condenser, a nitrogen gas introducing tube, an initiator and a monomer inlet, and a thermoregulated water tank, 200 g of distilled water was added to the reactor, the temperature was adjusted to 80 캜 while replacing nitrogen, and stirring was continued for 2 hours. Thereafter, 0.6 g of (N, N-diethylaminomethyl) trimethoxysilane was uniformly blended for 2 hours. The reaction product was allowed to stand at 80 DEG C for 2 hours, and then 2 g of ethylene glycol was added thereto to obtain about 1.1 kg of a flame retardant binder (solid content: 36%). 200 g of expanded smoking having an average particle size of 7.5 mu m was added to 800 g of the binder and uniformly dispersed to obtain 1 kg of a flame retardant coating agent.

2 kg of the flame retardant coating agent prepared in the above (1) was added while stirring 1 kg of the dried expanded polystyrene particles, and the mixture was stirred at a speed of 50 rpm, and the ribbon mixer was operated for 1 minute And the resin solution was uniformly applied to the expanded particles to obtain 2.2 kg of flame-retarded expanded polystyrene particles.

(3) Stirring was continued for about 10 seconds while warm air was being applied to the ribbon mixer at a temperature of 60 캜, and then 50 g of a water-soluble epoxy emulsion (Kido Chemical KEM-134-60) was added with stirring to prepare a coating with a flame- retardant acrylic- To make expanded polystyrene particles. Thereafter, it was dried to obtain expandable polystyrene particles having a skin layer having a flame-retarding property.

(4) The expandable polystyrene particles having the flame retardant skin layer obtained in (3) above were placed in a steam molding machine for EPS, heated at a steam pressure of 0.5 kg / cm3 for 1 minute, kneaded for 10 seconds and cooled to obtain flame retardant A foamed polystyrene molding was prepared.

⑤ Flame retardant performance test

The flame-retardant foamed polystyrene molding obtained in the above step (4) was cut into a plate having a width of 2 cm, a length of 2 cm and a thickness of 1 cm and used as a sample for flame retardancy test. The specimens were exposed to a flame of 5 cm in length formed in a Bunsen burner for 1 minute to test the flame retardant performance. As a result of the test, it was confirmed that the foamed polystyrene particles coated with the flame retardant coating showed almost no change in the skeleton, and that the foamed polystyrene particles retained the most rigid shape in comparison with Examples 1 and 2.

[Comparative Example 1]

460 g of vinyl acetate monomer and 40 g of acrylic acid were uniformly dissolved in 500 g of methanol to prepare 1 kg of a vinyl acetate polymer resin solution. Then, 50 g of expanded graphite having an average particle size of 15 탆 and 50 g of an average particle size Was added and uniformly dispersed to obtain 1 kg of a resin coating agent.

Then, as a result of carrying out the processes of (2) to (5) of the above example in the same manner, heat and flame were transferred through the skin layer, thereby confirming that the foamed polystyrene particles coated with the skin layer were collapsed and melted.

[Comparative Example 2]

200 g of aluminum hydroxide particles having an average particle size of 30 占 퐉 were added to 800 g of the ethylene vinyl acetate resin solution and uniformly dispersed to obtain 1 kg of a resin coating agent.

Then, as a result of carrying out the processes of (2) to (5) of the above example in the same manner, heat and flame were transferred through the skin layer, thereby confirming that the foamed polystyrene particles coated with the skin layer were collapsed and melted.

[Test Example]

The flame retardancy test was carried out on each of Examples 1 to 3 and Comparative Examples 1 and 2, and the results are shown in Table 1 below.

The flame retardancy test was carried out in accordance with KS F ISO 5560-1 (Cone Calorimetry) and KS F 2271, and the flame retardancy grade is as follows.

<Flame retardant grade 2>

* The total heat release rate is 10 MJ / m or less for 10 minutes after the start of the heating test, and the maximum heat release rate for 10 minutes does not exceed 200 KW / m continuously for more than 10 seconds.

* There should be no cracks, holes and melts penetrating through the specimen after heating for 10 minutes (including all core materials, including melting and extinction of composite materials).

* According to KS F 2271, the average behavioral stopping time of experimental rats should be more than 9 minutes.

<Flame retardant grade 3>

* Total heat release rate for 6 minutes after the start of the heating test is 8 MJ / m or less, and maximum heat release rate for 6 minutes does not exceed 200 KW / m continuously for more than 10 seconds.

* There should be no cracks, holes and melting (including all core materials in the case of composite materials, melting and extinction) through the specimen after heating for 6 minutes.

* According to KS F 2271, the average behavioral stopping time of experimental rats should be more than 9 minutes.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 10 minutes after start of heating test
Total Emitted Calories (MJ / m) 5 5 5 12 25 Maximum heat release rate for 10 minutes
(KW / m) 150 150 150 320 400 After heating for 10 minutes,
Crack, hole, melt clear clear clear Core material melting Core material melting Experimental mouse
Average downtime (minutes) 15 15 15 5 3

As can be seen in Table 1, the examples showed excellent flame retardancy corresponding to flame retardant grade 2, but the comparative examples did not satisfy all the criteria.

Claims (8)

10 to 50% by weight of at least two compounds selected from compounds containing at least one of an alcohol group, an ester group and an amino group;
0.01 to 0.5% by weight of a silane coupling agent;
0.1 to 5% by weight of polyhydric alcohol; And
45 to 89% by weight of a solvent,
The compound containing an alcohol group is polyvinyl alcohol,
The ester group-containing compound is at least one selected from vinyl acetate and acrylic compounds,
The compound containing an amino group is at least one selected from monoethanolamine, triethanolamine, urea and melamine,
The silane coupling agent is at least one selected from compounds represented by the following general formula (1)
[Chemical Formula 1]
RSi (R ') ₃
In this formula,
R is an alkyl group having 1 to 10 carbon atoms which contains or does not contain nitrogen,
R 'is a methoxy group, an ethoxy group or an acetoxy group,
The polyhydric alcohol is at least one selected from glycerin, ethylene glycol and diethylene glycol,
The solvent is at least one selected from water and alcohol,
Based on the flammability test according to KS F ISO 5560-1 and KS F 2271, the total heat release rate is 10 MJ / m or less for 10 minutes after the start of the heating test and the maximum heat release rate for 10 minutes is 200 KW / m or less continuously , And the average behavioral stopping time of the experimental rats is 9 minutes or more.
delete delete delete delete Producing a flame-retardant binder according to claim 1;
Preparing a flame-retardant coating agent by mixing 50 to 90% by weight of a flame-retardant binder and 10 to 50% by weight of a flame-retardant inorganic material with respect to the total weight of the flame-retardant coating agent;
Mixing 1,000 parts by weight of expanded polystyrene particles and 500 to 2000 parts by weight of a flame retardant coating agent to coat the expanded polystyrene particles with a flame retardant coating agent;
Mixing 1 to 100 parts by weight of a curing agent with respect to 1000 parts by weight of the expanded polystyrene particles, followed by drying to form expanded polystyrene particles having a flame-retardant skin layer; And
And forming a foamed polystyrene molded product by molding the expanded polystyrene particles having a flame-retardant skin layer to produce a molded article of a flame-retarded expanded polystyrene.
The method according to claim 6,
Wherein the flame-retardant inorganic material is at least one selected from aluminum hydroxide, calcium carbonate, expanded graphite, and silicate compounds.
The method according to claim 6,
Wherein the curing agent is at least one member selected from compounds containing at least one of an isocyanate group and an epoxy group.

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