KR20220040612A - Fire retardant polystyrene foam and making process thereof - Google Patents

Abstract

The present invention relates to a flame-retardant polystyrene foam and a manufacturing method thereof, and more specifically, to a flame-retardant polystyrene foam which improves the input timing and input method of a flame retardant so that the flame retardant that was input into a process operated at high temperatures during the manufacturing process of the polystyrene foam in order to obtain flame retardancy is input during the process operated at relatively low temperatures and a phenomenon in which the flame retardant is deteriorated by the high temperatures is prevented from occurring to reduce the input amount of the flame retardant, thereby reducing the production cost of the polystyrene foam, improving productivity, and preventing product quality deterioration due to the input of a large amount of the flame retardant.

Description

Flame-retardant polystyrene foam and its manufacturing method

The present invention relates to a flame-retardant polystyrene foam and a method for manufacturing the same, and more particularly, to obtain flame retardancy, a flame retardant that was put into a process operated at a high temperature during a manufacturing process of a polystyrene foam is added during a process operated at a relatively low temperature. Flame-retardant polystyrene foam that improves the quality and productivity by lowering the production cost of polystyrene foam by reducing the input amount of the flame retardant by preventing the deterioration of the flame retardant by high temperature by improving the input timing and input method of the it's about

When constructing a building, insulating materials are used to minimize heat loss through heat transfer inside and outside the building. In this case, when the thickness of the insulation used is constant, the insulation performance is affected by the thermal conductivity, and when water is absorbed, the thermal conductivity increases rapidly and the function of insulation is lost. Because it is light, it is easy to transport and construct, and it is good that the quality is uniform and there is no distortion or change with time even after long-term use. As an insulator that satisfies these requirements, EPS (Expanded polystyrene) foam or XPS, which is an expanded polystyrene foam or XPS, is a bubble type insulation that artificially forms an air layer by forming certain voids and bubbles inside using polystyrene resin as a raw material. (Extruded polystyrene) foam is widely used.

As a method of manufacturing such expanded polystyrene foam, bead-shaped beads or

The bead method and polystyrene raw material in which foam molded products are heated in advance using raw materials modified by additives, and then aged for an appropriate time, then filled in a plate-shaped mold and heated again to perform fusion molding by secondary foaming. There is an extrusion foaming method, which is formed by heating and melting and continuously extruding and foaming. The surface forms a flat surface. Since XPS foam is excellent in productivity and thermal insulation effect, the extrusion foaming method is currently adopted and used as a process for producing board-type polystyrene foam insulation.

Recently, expanded polystyrene foam, which is mainly used as an insulator, has been pointed out as a cause of emitting toxic gas while burning when a fire occurs in a building. There are regulations to ensure flame retardancy in the insulation itself, so that only products that have secured flame retardancy through self-extinguishing tests are used as insulation materials.

On the other hand, XPS products are manufactured by adopting the extrusion foaming method. In order to secure the self-extinguishing properties of XPS products, flame retardants are added together during the foaming and extrusion process to impart flame retardancy or self-extinguishing properties to the XPS products themselves. Before 2019, when hexabromocyclododecane (HBCD), a brominated flame retardant, was used as a flame retardant, it was able to pass the self-extinguishing test required by KS standard 3808 by adding 2.0% by weight or less based on the weight of polystyrene. , As it was found that HBCD disrupts the hormonal system of the human body and has harmful effects on the human body, such as the nervous system and immune system, the use of HBCD is regulated worldwide, so eco-friendly flame retardants have to be adopted and used. However, when using an eco-friendly flame retardant, in order to satisfy the self-extinguishing standard required by the KS standard for polystyrene foam insulation, 2.0 wt% or more of the polystyrene weight had to be added, so the amount of flame retardant was increased.

On the other hand, as a foaming agent used in manufacturing XPS foam, an HCFC-based compound was adopted and used. In the case of using a mixed gas of R-22 and 142b as a foaming agent, even if an eco-friendly flame retardant other than HBCD is used. It was possible to maintain the flammability index of 1.5 to 3.0 required by the KS standard even when added at 2.0% or less based on the weight of polystyrene.

However, recently, as HCFC substances increase the greenhouse effect and destroy the ozone layer, which used to block UV rays, and as they are subject to stricter regulations, they have to be replaced with eco-friendly combustible gases. In order to secure the self-extinguishing properties required by KS standard 3808, the input of expensive flame retardants is increasing more than the current manufacturing process, which is a major cause of increasing the manufacturing cost of XPS products. was causing the

On the other hand, flame retardants have a characteristic that flame retardant performance is greatly influenced by the temperature used, and isopropylidenebis (4,4'-isopropylidenebis), tetrabromobisphenol-A In order to secure the self-combustibility required for insulation products according to the KS standard, the amount of flame retardant input has to be increased. was causing

In order to solve this problem, the key is to keep the temperature of the process at 150° C. or less, which is the temperature at which the flame retardant is added in the XPS foam manufacturing process to suppress the deterioration of the flame retardant as much as possible. It is necessary to mix it into the material.

However, in order to form uniform and fine pores to provide an excellent thermal insulation effect, it is essential to melt the raw materials by heating at 180 to 210° C. so that the raw materials are sufficiently melted and uniformly mixed. In particular, after the heating and melting process, a liquid foaming agent is put in to foam the product. At this time, if the foaming agent vaporizes and a rapid temperature drop occurs, this may cause a problem in the quality of the foamed product. It is common to maintain it at 180~210℃, which is a temperature that does not receive heat.

Therefore, in the conventional XPS foam manufacturing process, the eco-friendly flame retardant was put together with other raw materials in the heating and melting process operated at a temperature higher than 150 ° C. In order to satisfy the self-extinguishing property required by KS standard 3808, the input amount of flame retardant had to be increased. It was a major cause of lowering the productivity and quality of products.

Therefore, flame retardant polystyrene having the self-extinguishing ability required by the KS standard without increasing the manufacturing cost of the product by minimizing the amount of flame retardant used by improving the manufacturing process of the conventional XPS foam and improving the injection and injection method of the flame retardant A new manufacturing process capable of manufacturing the foam was needed.

Patent Document 1: Republic of Korea Patent No. 10-0750626 (registered on August 13, 2007) Patent Document 2: Republic of Korea Patent Registration No. 10-1407925 (Registered on Jun. 10, 2014) Patent Document 3: Republic of Korea Patent No. 10-1808736 (registered on Dec. 7, 2017)

The present invention has been devised to solve the problems of the conventional flame-retardant polystyrene foam manufacturing process as described above,

The present invention adjusts the input timing and input method of the flame retardant injected during the flame retardant polystyrene foam manufacturing process, so that the flame retardant is added during the cross-line transport step carried out at a relatively low temperature compared to the conventional manufacturing process in which the flame retardant is injected at a high temperature. Flame-retardant polystyrene foam and its manufacturing method that reduce the amount of flame retardant that deteriorates at high temperature by injecting and mixing and then extruding and foaming, thereby lowering the production cost of the product and improving the productivity of the entire manufacturing process is intended to provide

In addition, it is another object of the present invention to provide a flame-retardant polystyrene foam capable of reducing the amount of flame retardant used and preventing deterioration of product quality and a method for manufacturing the same.

A method for producing a flame-retardant polystyrene foam according to the present invention includes a raw material input step (S100) of injecting a polystyrene resin and an additive into a first screw mixer; A heating melt foaming extrusion step (S200) of heating the injected raw materials to a temperature of 180 ~ 210 °C while additionally adding a foaming agent to the first screw mixer, mixing them in a molten state, and foaming and extruding; Cross-line transfer step (S300) of transferring the foamed-extruded molten mixture through the cross line through the heating melt foaming extrusion step (S200); A flame retardant mixing step (S400) of mixing a flame retardant in the foamed-extruded molten mixture transferred through the cross line; A cooling foam extrusion step of uniformly foaming and extruding the foamed-extruded molten mixture mixed with the flame retardant in the cross-line into a second screw mixer, cooled to a temperature of 90 to 110° C. and uniformly foamed and extruded (S500); A homogeneous mixing step of uniformly mixing the foamed extrudate cooled to a temperature of 90-100° C. using a large-capacity static mixer (S600); and a polystyrene foam forming step (S700) of producing a polystyrene foam by forming a uniformly mixed foamed extrudate into a profile through a die.

Polystyrene resin is an amorphous polymer obtained by radical polymerization of styrene, and is a colorless and transparent thermoplastic resin. Its boiling point is 145℃, and it is made of polystyrene, a polymer of liquid styrene units formed by reacting ethylene and benzene, is not easily eroded by chemicals, has excellent processability, has a high refractive index, is transparent, has beautiful colors, and is hard It becomes a molded product and is excellent as an electrical insulating material. In addition, it is stable to heat, has good fluidity, and is odorless and non-toxic. At this time, it is preferable to use a mixture of 40 to 70 weight of the new polystyrene resin and 30 to 60 weight of the regenerated polystyrene resin as the polystyrene resin, which does not affect the quality of the product compared to using only the new polystyrene resin. However, this is because the manufacturing cost can be further reduced by mixing and using recycled polystyrene.

On the other hand, the additives added together with the polystyrene resin vary depending on the properties required for the polystyrene foam. In addition to the nucleating agent and heat stabilizer required in the foaming and extrusion process, pigments may be added as needed to give a certain color to the foam product. there is.

Foaming agents commonly used in the production of polystyrene foam include water (H ₂ O), alcohol, HCFC (R-22, R-142b) in a liquid state under pressure, butane, carbon dioxide (CO ₂ ), dimethyl ether (DME, CH ₃ ) OCH ₃ ) or HFC (R-134a, R-152a). It is preferable that the foaming agent adopted and used for manufacturing the flame-retardant polystyrene foam according to the present invention is a mixture of any one or more of HCFC, HFC, cyclopentane, and DME. Specifically, R-142b and R-22 are adopted as hydrochlorofluorocarbons (HCFC) series, and R-134a and R-152a are adopted as hydrofluorocarbons (HFC) series, and these are mixed and used. In addition, cyclopentane , and DME are also mixed and used. If necessary, a mixture of three types of HCFCs, HFCs and DMEs is also adopted.

On the other hand, when a liquefied foaming agent is used, the temperature rapidly drops upon input, so that foaming is not uniform, and the molten mixture is sometimes hardened, so foaming and extrusion may not be performed properly. Therefore, when a gaseous foaming agent is used or a liquid foaming agent is used, it is preferable to control the process temperature high so that the outlet temperature of the first screw mixer operated in the heating melt foaming extrusion step (S200) is 200° C. or higher. .

On the other hand, the flame retardant used in the manufacturing process according to the present invention is preferably a mixture of isopropylidenebis (4,4'-isopropylidenebis) and tetrabromobisphenol-A (Tetrabromobisphenol-A), because it is environmentally friendly Because it is a flame retardant.

However, when an eco-friendly flame retardant is input in the heating melt foaming extrusion step operated at high temperature, the flame retardant is decomposed or deteriorated due to high temperature, so that it cannot sufficiently play a role as a flame retardant. In order to lower the unit cost, it is necessary to mix and foam the flame retardant during a process operated at a low temperature in which decomposition or deterioration of the flame retardant does not occur.

On the other hand, the flame retardant mixing step among the components of the present invention is a flame retardant melting step (S410) of injecting flame retardant pellets or flame retardant powder into a flame retardant screw mixer and heating and pressurizing to a temperature of 160° C. or less to melt and mix; A molten flame retardant transfer step (S420) of transferring the molten flame retardant to the cross line using a quantitative high-pressure pump; and a molten flame retardant mixing step (S430) of injecting the molten flame retardant into the flame retardant mixing mixer installed connected to the cross line and mixing the foamed and extruded molten mixture transported through the cross line at a constant weight ratio per unit time (S430) am.

In the flame retardant melting step (S410), it is preferable to employ and use a small screw mixer having a heating zone as a flame retardant screw mixer. In detail, the capacity of the flame retardant screw mixer is preferably 1/20 of the capacity of the first and second screw mixers, and the temperature is preferably 160 ° C or less and the pressure is preferably operated at 180 bar.

In the molten flame retardant transfer step (S420), it is preferable to employ and use a HDP (High Differential Pressur) pump to uniformly and quantitatively inject the molten flame retardant into the flame retardant mixing mixer installed on the cross line. The HDP pump has a transfer capacity of 50 kg per hour and is preferably operated at a temperature of 150 °C and a pressure of 50 to 180 bar.

The flame retardant mixing mixer used in the melting flame retardant mixing step (S430) is preferably used in combination with a plurality of static mixers to have sufficient mixing capacity. At this time, in the case of adopting and using flame retardant pellets, the flame retardant pellets are prepared by melting and mixing in a ratio of 50 to 70 weight of flame retardant and 30 to 50 weight of polystyrene resin and then solidifying in pellet form. Flame retardant pellets are prepared in the form of pellets after batch mixing of a polystyrene resin and a flame retardant in a master batch. This is because in the case of manufacturing and using flame retardant pellets in this way, it has the advantage of being mixed well with the foamed-extruded melt mixture that is melt-mixed from the first screw mixer and transferred to the cross line. This is because the present flame retardant can be mixed well uniformly.

On the other hand, in the melt flame retardant mixing step, for uniform mixing of the foamed and extruded melt mixture transferred through the cross line and the melt flame retardant supplied through the flame retardant mixing step, 100 weight of the foamed and extruded melt mixture transferred through the cross line per unit time It is preferable to mix in a ratio of 2 to 4 weight of the melt flame retardant.

On the other hand, flame-retardant polystyrene foam, which is another aspect of the present invention, is manufactured by the manufacturing method described above, and contains 85 to 90% by weight of polystyrene resin, 0.5 to 2% by weight of additives, 6 to 14% by weight of foaming agent, and 0.5 to 4.0% by weight of flame retardant. It is characterized in that it is composed.

The present invention adjusts the input timing and input method of the flame retardant injected during the flame-retardant styrene foam manufacturing process, injects the flame retardant in the cross-line transfer step operated at a relatively low temperature, mixes it uniformly with the molten polystyrene raw material, and then extrudes and foams it By doing this, it is possible to prevent the deterioration of the flame retardant due to high temperature, thereby reducing the amount of expensive flame retardant used, thereby lowering the production cost of the product, thereby increasing the productivity of the product and preventing the deterioration of the product quality due to the input of a large amount of flame retardant.

1 shows the overall process of the conventional method for producing a flame-retardant polystyrene foam.
Figure 2 shows the entire manufacturing process with respect to the manufacturing method of the flame-retardant polystyrene foam according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the manufacturing method of the flame-retardant polystyrene foam according to the present invention.

1 shows the overall process of the conventional method for producing a flame-retardant polystyrene foam.

The flame-retardant polystyrene foam produced by the conventional manufacturing method is a polystyrene resin, an additive, and a flame retardant, which are the main material, put into the first screw mixer operated at 180 to 210 ° C. While the molten mixture is transferred through the cross line and the second screw mixer, it is allowed to foam and extrude while cooling.

In this conventional manufacturing process, the polystyrene resin, additives, and flame retardant are put together before the melt heating process performed in the first screw mixer of the extruder, and after the melting process at a high temperature of 180 ° C. or higher to have sufficient fluidity, a blowing agent is added and mixed By doing so, it was possible to produce products with uniform quality, that is, uniformity of foaming, flame retardancy, strength, and the like. However, this conventional manufacturing process cannot prevent the eco-friendly flame retardant from being deteriorated by high temperature, and the performance of the flame retardant is significantly deteriorated. This increased the manufacturing cost, which in turn increased the unit price of the product.

Figure 2 shows the entire manufacturing process of the method for manufacturing the flame retardant polystyrene foam according to the present invention, Figure 3 shows in detail the process of the flame retardant mixing step among the components of the present invention.

In the raw material input step (S100), a new polystyrene resin and a regenerated polystyrene resin are mixed to prepare a polystyrene raw material, and necessary additives are prepared and added thereto. In Examples, a mixing weight ratio of the new polystyrene resin and the regenerated polystyrene resin was set to 6:4. Here, a nucleating agent and a pigment were adopted as additives, and the additive was prepared in a ratio of 1% by weight of the total to 87% by weight of the polystyrene resin and added to the first screw mixer.

In the heating melt foaming extrusion step (S200), the injected polystyrene resin and additives are melt-mixed in a first screw mixer operated at a temperature of 180 to 210 ° C. It is mixed thoroughly to make foaming extrusion, but it is important to make as uniform foaming as possible. The foaming agent is for forming pores inside the polystyrene foam, and by generating gas to form a pore grid, the weight of the product is reduced and features such as heat insulation, cushioning and soundproofing properties are provided. At this time, as the blowing agent, a mixture of HCFC in which R-22 and R-142 are mixed in a weight ratio of 6:4 and R-134a, R-152a and DME, which are HFCs, in a weight ratio of 3:2:0.5 was adopted and used, 9 It was added in the ratio of weight %.

In the cross-line transfer step (S300), the molten material uniformly foamed and extruded in the heat-melt-extrusion foaming step is transferred through a cross line installed by connecting the first screw mixer and the second screw mixer to each other.

In the flame retardant mixing step (S400), the flame retardant in the powder state or the flame retardant in the form of pellets prepared in advance is melted, and then transferred to a flame retardant mixing mixer mounted on the cross line at a constant weight ratio per hour, and transferred from the first screw mixer in the cross line. By mixing with the foamed and extruded melt, the flame retardant was introduced and mixed at a lower temperature than the first screw mixer, so that thermal decomposition or deterioration of the flame retardant due to high temperature was minimized.

In this example, flame retardant pellets were adopted and used, and 40 wt% of a polystyrene resin and 60 wt% of a flame retardant were mixed to form a master batch, and then pelletized and used. In addition, the amount of the added flame retardant was 3% by weight.

On the other hand, if the embodiment of the flame retardant mixing step (S400) will be described in more detail, in the flame retardant melting step (S410), the flame retardant pellets are put into a small flame retardant screw mixer and heated and pressurized to a temperature of 150 ° C. or less and melted. Thereafter, the molten flame retardant is quantitatively transferred to the flame retardant mixing mixer mounted on the cross line at a pressure of 100 to 200 bar while maintaining the temperature of 150 ° C using the HDP pump in the molten flame retardant transfer step (S420). In the melt flame retardant mixing step (S430), the foamed and extruded melt mixture transferred through the cross line and the flame retardant melted in the mixing mixer for flame retardants are received at a ratio of 100 weight per hour to 2.5 to 3.0 weight and sufficiently mixed. As described above, the flame retardant mixing mixer used in the melting flame retardant mixing step (S430) was used by combining eight 90 mm size static mixers to have sufficient mixing ability.

In the cooling foaming extrusion step (S500), as in the conventional production process, the second screw mixer is used to cool and mix while cooling to a temperature of 90 to 110 ° C.

In the homogeneous mixing step (S600), the mixture that has undergone the cooling foaming extrusion step using a static mixer is uniformly mixed once again. In this case, the capacity of the static mixer used may be selected and adopted by selecting a large capacity or a small capacity as needed.

Thereafter, in the polystyrene foam forming step (S700), a flame retardant polystyrene foam board was manufactured by forming a profile using a T-die to form a foam board.

The non-flexible polystyrene foam prepared in the above example was prepared in the form of a board having a thickness of 100 mm, a width of 900 mm, and a length of 1800 mm. The density of this flame-retardant polystyrene foam was 32 kg/m3, the compressive strength was 20 N/cm2, and the thermal conductivity was 0.0275 W/m.K, confirming that it had excellent thermal insulation properties. In addition, it was confirmed that the flame retardancy satisfies KS standard 3808.

On the other hand, it was tested whether the test pieces manufactured in this example and the test pieces manufactured by the conventional manufacturing process satisfy the self-extinguishing properties of KS standard 3808, respectively. In this experiment, when the type and weight of the input materials are the same, and when only the input timing and input method of the flame retardant are different, the polystyrene foam specimens manufactured according to each process satisfy the flame retardancy, that is, self-extinguishing properties required by KS standard 3808, respectively. It was checked whether

The flame-retardant polystyrene foam manufactured according to the conventional manufacturing process was used as a comparative example, and the flame-retardant polystyrene foam manufactured according to the embodiment of the present invention was taken as an example. made it

Polystyrene resin is a mixture of 610 kg of new raw material and 347 kg of recycled raw material, and 60 kg of HCFC mixed with R-22 and R-142b and HCFC of R-134a, R-152a and DME are 3:2 as a foaming agent: 50 kg of the mixture mixed in a weight ratio of 0.5, 5 kg of nucleating agent, 4 kg of pigment and heat stabilizer, and 18 kg of flame retardant were used. In this case, the flame retardant used was a mixture of isopropylidenebis and tetrabromobisphenol-A in a weight ratio of 1:1. In both Comparative Examples and Salsi Examples, the same weight of raw materials was input, and the operating temperature and conditions in the entire foaming and extrusion process were the same, and only the time and method of adding the flame retardant were different. The specimens manufactured according to each manufacturing method were manufactured in the form of panels with a width of 50 mm, a length of 150 mm, and a thickness of 13 mm, respectively.

Five specimens were prepared in each of Comparative Examples and Examples according to each manufacturing method, and after drying in a hot air circulation dryer at 30° C. for 1 week to remove moisture remaining in each specimen, each specimen was self-extinguishing according to KS standard 3808. It was tested whether the criteria were met. In order to pass the self-extinguishing test according to KS standard 3808, the combustion length must be less than 60mm, and the combustion time must be less than 120 seconds.

The results of measuring the burning length and burning time for each specimen are shown in Table 1 below.

Combustion length (mm) Combustion time (sec) Compliance with the standard comparative example Psalm 1 95 115 incongruity Psalm 2 101 110 incongruity Psalm 3 97 130 incongruity Psalm 4 105 135 incongruity Psalm 5 98 115 incongruity Example Psalm 1 53 32 fitness Psalm 2 44 27 fitness Psalm 3 46 26 fitness Psalm 4 42 25 fitness Psalm 5 45 30 fitness

Through the experimental results as described above, the specimens of the flame-retardant polystyrene foam product manufactured by the conventional manufacturing process did not satisfy the self-combustibility according to KS standard 3808, while the flame-retardant polystyrene foam manufactured by the manufacturing process according to the present invention. It was confirmed that all five specimens satisfy the self-combustibility according to KS standard 3808.

On the other hand, when the type of flame retardant input is the same in the production of flame retardant polystyrene foam of the same size, shape and number with the same self-extinguishing index, the difference in the amount of the flame retardant input and the effect of cost reduction and Table 2 below compares the manufacturing cost, which is the cost.

Flame retardant input amount Flame Retardant Cost product production cost conventional process
(Comparative example) 3.5 wt% 21 million won About 161.5 million won Inventive process
(Example) 1.8 wt% 10.8 million won About 151.3 million won

Table 2 shows the flame retardant input amount and cost and products required according to the conventional process and the process according to the present invention, based on the case where 100 tons of flame-retardant polystyrene foam satisfying KS standard 3808 was produced per day and operated on 20 days a month. The cost of production was calculated and compared with each other. In this case, the input amount of the flame retardant is expressed in weight % based on the weight of the total solid raw material.

Through this comparison, the amount of the flame retardant input required to satisfy the self-extinguishing property required by the KS standard for the production method of the flame-retardant polystyrene foam according to the present invention compared to the existing production process is remarkably reduced by about half, and thus, the flame retardant input cost and schedule It is confirmed that the production cost of the flame retardant polystyrene foam for the period is also significantly lowered. Due to this, it can be confirmed that the productivity of the flame-retardant polystyrene foam product according to the present invention can be increased. Furthermore, since the amount of flame retardant input is only half of that of the existing process, it is possible to prevent deterioration of product quality due to input of a large amount of flame retardant.

S100: Raw material input stage
S200: heating melt foaming extrusion step
S300: Cross line transfer step
S400: flame retardant mixing step
S410: flame retardant melting step
S420: molten flame retardant transfer step
S430: melting flame retardant mixing step
S500: cooling foam extrusion step
S600: homogeneous mixing step
S700: polystyrene foam forming step

Claims (10)

In a method for producing a flame-retardant polystyrene foam by mixing an additive, a flame retardant and a foaming agent with a polystyrene resin, heating and melting the mixture, and then compressing and foaming it,
A raw material input step (S100) of putting the polystyrene resin and additives into the first screw mixer;
A heating melt foaming extrusion step (S200) of heating the injected raw materials to a temperature of 180 ~ 210 °C while additionally adding a foaming agent to the first screw mixer, mixing them in a molten state, and foaming and extruding;
Cross-line transfer step (S300) of transferring the foamed-extruded molten mixture through the cross line through the heating melt foaming extrusion step (S200);
A flame retardant mixing step (S400) of mixing a flame retardant in the foamed-extruded molten mixture transferred through the cross line;
A cooling foaming extrusion step of uniformly foaming and extruding the foamed-extruded melt mixture mixed with a flame retardant in the cross-line into a second screw mixer, cooled to a temperature of 90 to 110° C., and uniformly foamed and extruded (S500);
A homogeneous mixing step of uniformly mixing the foamed extrudate cooled to a temperature of 90-100° C. using a large-capacity static mixer (S600); and
A polystyrene foam forming step (S700) of manufacturing a polystyrene foam by forming a uniformly mixed foamed extrudate into a profile through a die;
The method according to claim 1,
The polystyrene resin is a method for producing a flame-retardant polystyrene foam, characterized in that it is mixed in a ratio of 60 to 70 weight of the new polystyrene resin and 20 to 30 weight of the regenerated polystyrene resin.
The method according to claim 1,
The additive is a method for producing a flame-retardant polystyrene foam, characterized in that any one or more of a nucleating agent, a heat stabilizer and a pigment.
The method according to claim 1,
The foaming agent is a method for producing a flame-retardant polystyrene foam, characterized in that a mixture of any one or more of HCFC, HFC, cyclopentane, and DME.
The method according to claim 1,
The flame retardant is isopropylidenebis and tetrabromobisphenol-A method for producing a flame retardant polystyrene foam, characterized in that a mixture.
6. The method according to any one of claims 1 to 5,
The flame retardant mixing step,
Flame retardant melting step (S410) of putting the flame retardant pellets or flame retardant powder into the flame retardant screw mixer and heating and pressurizing to a temperature of 160 ° C or less to melt and mix;
A molten flame retardant transfer step (S420) of transferring the molten flame retardant to the cross line using a quantitative high-pressure pump; and
A molten flame retardant mixing step (S430) of injecting the molten flame retardant into the flame retardant mixing mixer installed connected to the cross line and mixing the foamed and extruded molten mixture transported through the cross line at a constant weight ratio per unit time (S430); characterized in that it is composed of A method for producing a flame-retardant polystyrene foam.
7. The method of claim 6,
The flame retardant pellet is a flame retardant polystyrene foam manufacturing method, characterized in that it is prepared by melting and mixing in a ratio of 50 to 70 weight of the flame retardant and 30 to 50 weight of the polystyrene resin and then solidifying it in the form of pellets.
7. The method of claim 6,
In the melt flame retardant mixing step, the flame retardant polystyrene foam manufacturing method, characterized in that it is mixed in a ratio of 2 to 4 weight of the melt flame retardant with respect to 100 weight of the foamed and extruded melt mixture transferred through the cross line per unit time.
It is prepared by the method of any one of claims 1 to 5,
Flame-retardant polystyrene foam, characterized in that it is composed of 85 to 90% by weight of polystyrene resin, 0.5 to 2% by weight of additives, 6 to 14% by weight of foaming agent, and 0.5 to 4.0% by weight of flame retardant.
It is prepared by the method of claim 6,
Flame-retardant polystyrene foam, characterized in that it is composed of 85 to 90% by weight of polystyrene resin, 0.5 to 2% by weight of additives, 6 to 14% by weight of foaming agent, and 0.5 to 4.0% by weight of flame retardant.

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