KR100846812B1 - Manufacturing method of non flammable expanded plastic sheet and manufacturing method of metal plastic composite panel with core part made of non flammable expanded plastic sheet - Google Patents

Abstract

A method for producing a flame resistant foamed plastic sheet is provided to accomplish fire extinguishment while inhibiting melting of a plastic resin used in an inner core of a metal composite panel, propagation of fire and harmful gas generation. A method for producing a flame resistant foamed plastic sheet(13) comprises the steps of: forming a plurality of holes on a foamed plastic sheet(10) produced via an extrusion foaming process; and applying a foamable inorganic flame resistant material(12) comprising 93-99 wt% of a liquid silicate-based inorganic flame retardant formed of at least one of sodium silicate, potassium silicate, colloidal silica and lithium silicate, and 1-7 wt% of a foaming agent formed of any one of sodium bicarbonate, potassium bicarbonate, azodicarbonamide, oxybisbenzene sulfonyl hydrazide, dinitrosopentamethylene tetramine, p-toluene sulfonyl hydrazide and p-toluene sulfonyl semicarbazide into the holes and on the surface of the foamed plastic sheet at least twice, followed by drying.

Description

MANUFACTURING METHOD OF NON FLAMMABLE EXPANDED PLASTIC SHEET AND MANUFACTURING METHOD OF METAL PLASTIC COMPOSITE PANEL WITH CORE PART MADE OF NON FLAMMABLE SHEETET PLASTIC }

1 is a perspective view of a conventional metal composite panel,

2 is a process chart showing the manufacturing process of the flame-retardant foam plastic sheet having a foaming and extinguishing action according to the present invention,

Figure 3 is a cross-sectional view of the flame-retardant foam plastic sheet formed with a hole of the present invention,

4 is a cross-sectional view of a flame-retardant foam plastic sheet coated with a foamed inorganic flame retardant to the flame-retardant foam plastic sheet of Figure 3,

5 is a cross-sectional view of the flame-retardant foam plastic sheet having a hole twice in the flame-retardant foam plastic sheet of Figure 4,

Figure 6 is a cross-sectional view of the flame retardant foam plastic sheet re-coated with a foamable inorganic flame retardant to the flame retardant foam plastic sheet of Figure 5,

7 to 13 is a photograph of a flame retardant experiment carried out with a flame-retardant foam plastic sheet according to the present invention,

14 is a cutaway perspective view of a conventional flux-type metal composite panel,

15 is a cutaway perspective view of a conventional honeycomb metal composite panel.

<Description of Major Symbols in Drawing>

10: foamed plastic sheet 11: hole

12: foamable inorganic flame retardant material 13: flame retardant foam plastic sheet

14 hole 15 flame retardant adhesive

20: hole molding machine 21: needle

22: perforated plate 30: roller

40: squeeze

The present invention relates to a method for producing a flame-retardant foam plastic sheet having a characteristic of foaming and extinguishing and a metal composite panel using the same, and more particularly, to easily form a plurality of holes in the foamed plastic sheet by a needle punching method, the foaming The present invention relates to a flame-retardant foamed plastic sheet having a foaming and extinguishing effect in a fire by applying a liquid foamable inorganic flame retardant to a hole and both surfaces of a plastic sheet, and a method of manufacturing a metal composite panel using the same in a fast and continuous manner.

Currently, aluminum composite panels and metal composite panels having a thickness of about 3 to 8 mm are used as exterior materials, interior decorations, interior materials, or interior materials of buildings, houses, factories, and the like.

Here, the conventional metal composite panel 100 is a foamed polyethylene sheet of 3 ~ 6mm thickness produced by the extrusion method inside as shown in Figure 1 as the inner core material 110, of the expanded polyethylene sheet made by the extrusion method Metal sheets 120 and 130 such as aluminum and stainless steel, each having a thickness of about 0.1 to 0.5 mm on both sides, are melted by heat with a plastic resin of a material such as a film or expanded polyethylene sheet, or adhered with a chemical adhesive. It means coating | coating (the composite panel which coated the sheet | seat of metals, such as an aluminum sheet or stainless steel sheet | seat on both surfaces later) is called a metal composite panel.

Here, in the conventional metal composite panel, in order to avoid the risk of fire, a solid organic flame retardant material of aluminum hydroxide or magnesium hydroxide is mixed and an inorganic flame retardant composition having a nonflammable and adhesive property is applied to the inner core provided with a polyethylene sheet. It was also used.

In addition, as shown in FIG. 14, a metal composite panel 200 (hereinafter, referred to as a “FLUX type metal composite panel”) using an aluminum thin film sheet having a wavy shape as the inner core 210 is used. did.

In addition, as shown in FIG. 15, a metal composite panel 300 (hereinafter, referred to as a honeycomb type metal composite panel) using an air layer for thermal insulation using a honeycomb-shaped aluminum thin film sheet as an inner core 310. ).

However, in the conventional metal composite panel, the metal composite panel made of the polyethylene sheet produced by the extrusion method as an inner core has a problem of melting the heat and the flame and causing a burn to the human body or spreading the fire when a fire occurs.

In addition, metal composite panels with inner cores of aluminum sheet materials of the flux or honeycomb shape are made for the purpose of combining incombustibility and insulation, but have difficulty in manufacturing process and equipment cost to make a specific shape. And material costs are high. In addition, there was a problem that the process of bonding the aluminum sheet or another metal sheet on both sides of the inner core material with a chemical adhesive is not easy.

In addition, in order to avoid the risk of fire, a metal composite panel made of solid powder such as magnesium hydroxide or aluminum hydroxide and applied to the inner core material is expensive in processing and manufacturing equipment, but in the form of curved or circular shape. In the process of forming the panel, or in the process of cutting and bending one side to be processed into a box-shaped shape, there is no flexibility, and thus there is a difficulty in processing and molding.

Therefore, in order to solve the above problem, there is an urgent need for a metal composite panel having an inner core of a flame-retardant foam plastic sheet that overcomes thermal insulation, flexibility, and a fire hazard.

Thus, to overcome the above problems, a foamed plastic sheet of a thermoplastic resin in a foamed state, such as foamed polystyrene, foamed polyvinyl chloride resin, etc. as a material of the present invention, and has a flexible, good thermal insulation and foaming in the event of a fire to extinguish It will be described the structure and operation of continuously producing a flame-retardant foam plastic sheet having a flame-retardant functionality and a metal composite panel using the same as an inner core material.

Hereinafter, in order to manufacture the flame-retardant foamed plastic sheet of the present invention, a process of manufacturing a foamed plastic sheet having a thickness of 1.0 to 15mm as a raw material of polystyrene resin will be described.

The foamed plastic sheet made of polystyrene resin is composed of styrene monomer and the polystyrene water support material in pellet form is prepared.

Then, the polystyrene water support material is put into the screw and cylinder of the extruder through a hopper and heated to 120-180 ° C. with a heater heat. Then, it is melted like a jelly between the screw and the cylinder, and is gradually pushed in one direction of the die where the grooves of the required shape are dug and coupled to one end of the cylinder.

At this time, the foamed gas such as pentane, butane, freon or carbon dioxide is released during the process that the polystyrene water support material is melted by the heater heat between the screw and the cylinder for the purpose of making the manufactured molding light weight and thermal insulation. Pressure is reduced by forcibly injecting the cylinder of the extruder through a high pressure pump and piping.

Then, the polystyrene water support material forcibly mixed with the gaseous blowing agent is unfolded in the form of a smooth sheet through a T-shaped die or through a die having a circular pipe-shaped hole. It comes out in a pipe shape and foams in contact with the outside air. At this time, when the foamed synthetic resin raw material mixture is pressed by a roller between two or more rollers to produce a smooth sheet form.

Foamed plastic sheet produced through the above process has a foaming magnification of about 10 to 20 times and a density of 50 ~ 100Kg / m ³ . In addition, the monomer material of polystyrene in the components of the foamed plastic sheet is in the form of a silkworm cocoon, and occupies 5 to 10% of the volume of the foamed plastic sheet, and the remaining 90 to 95% is occupied by air. Done.

At this time, the air bubbles are blocked by the resin of the foamed plastic sheet so that the bubbles are completely independent. That is, the air bubbles of each air is made of an isolated structure without being connected to each other, so that the liquid such as air or water hardly passes.

In addition, plastic sheets such as polyethylene, polyvinyl chloride resin (P.V.C), polypropylene, and the like may also be produced as foamed plastic sheets in a state of extrusion foaming by a similar process.

However, in the present invention, a flexible plastic sheet material such as polyethylene, polyflopyrene, etc. among the above-described plastics can be produced, but the process of applying and drying the inorganic flame retardant to be described later on both surfaces of holes or foamed plastic sheets. Even after the flexibility is too large, there was a problem that the flame retardant is not fixed in place and peeled or separated.

Therefore, the foamed plastic sheet of the inner core material used in the metal composite panel according to the present invention is preferably a plastic sheet of thermoplastic resin having a rigid and flexible, such as foamed polystyrene, foamed vinyl chloride resin, foamed polycarbonate.

The present invention has been devised to solve the above problems as a foam fire and fire extinguishing action when the fire occurs, the plastic resin of the inner core material melts and flows down, the phenomenon of transferring the fire to other materials and the generation of harmful gases flame retardant foam plastic An object of the present invention is to provide a sheet and a method for manufacturing a metal composite panel using the same.

Another object of the present invention is to provide a flame-retardant foamed plastic sheet and a metal composite panel using the same, which can be easily produced in a consistent, fast and continuous manner.

In addition, the structural material including the metal composite panel, which is a structural material used for building interior materials, is one of the flame retardant test methods, and the composite metal panel and the provision that there should be no flame remnants by adding more than 750 degrees of flame and heat to the surface of the interior material for more than 5 minutes. There is a provision that the inner core of the core is completely extinguished and melted by the flame and heat, so that it cannot be used as a building interior material or exterior material more than flame retardant grade 3. Therefore, the present invention has a foaming effect of extinguishing and flame retardant to maintain the state that the flame remains or does not transfer even when the inner core is not extinguished or melted in the heat and flame of more than 750 degrees Celsius even when heated by the flame and heat of 750 degrees Celsius or more An object of the present invention is to provide a flame retardant foamed plastic sheet and a method for manufacturing a metal composite panel using the same.

In addition, the present invention is a flame-retardant foam plastic sheet and a metal composite panel having a flexible plastic sheet used as an inner core material to facilitate the processing of shapes such as curves or circles, and the metal composite panel has a thermal insulation to facilitate processing To provide a method for producing a metal composite panel used.

The above object is to form a plurality of holes in the foamed plastic sheet produced by the extrusion foaming method according to the present invention, 93% to 99% by weight of a liquid silicate-based inorganic flame retardant containing sodium silicate, potassium silicate and sodium bicarbonate, A foamed inorganic flame retardant obtained by mixing a foaming agent containing any one of potassium bicarbonate and azodicarbonamide, OBSH, DPT, TSH, and PTSS at 1% by weight to 7% by weight at least two times on the surface of the hole and the foamed plastic sheet. It is achieved by a method for producing a flame-retardant foam plastic sheet comprising the step of applying and drying.

Here, the forming of a plurality of holes in the foamed plastic sheet, and the step of applying the foamed inorganic flame retardant to the surface and the hole of the foamed plastic sheet is a plurality of needles and the needle is located between the needle and the foamed plastic sheet Forming a hole in the foamed plastic sheet by a hole molding machine having a perforated plate perforated therethrough; Applying the foamable inorganic flame retardant to the surface of the foamed plastic sheet having the hole; Uniformly applying the expandable inorganic flame retardant applied to the surface of the foamed plastic sheet with a squeeze or a brush; It may include the step of drying the surface of the uniformly coated foamed plastic sheet.

On the other hand, the object of the flame retardant foam plastic sheet prepared by the method for producing a flame-retardant foam plastic sheet according to the present invention is provided with one of bromine, antimony trioxide, ammonium phosphate, melamine, phenol, urea or flame retardant mixture of two or more Applying with an adhesive;

It is also achieved by a metal composite panel manufacturing method using a flame-retardant foam plastic sheet comprising the step of attaching a metal sheet on the surface of the flame-retardant foam plastic sheet coated with the flame-retardant adhesive.

Hereinafter, with reference to the accompanying drawings will be described in detail a method for producing a flame-retardant foam plastic sheet according to the present invention.

Method for manufacturing a flame-retardant foam plastic sheet according to the first embodiment of the present invention, as shown in Figure 2, the step of forming a hole (11) in the foamed plastic sheet (10), foamed plastic sheet (10) The step (B) of applying the foamable inorganic flame retardant material 12 on the surface of), and the step (C) of uniform coating.

Forming a hole in the foamed plastic sheet 10 (A) is a hole in the path that the foamed plastic sheet 10 manufactured through the foaming process by the extrusion method is transported through the extrusion roller 140 and the take-out roller 150 The molding machine 20 is positioned and reciprocated by the needle 21 of the hole molding machine 20 to form a hole 11 in the foamed plastic sheet 10.

At this time, a perforated plate 22 is further provided between the hole former 20 and the foamed plastic sheet 10. As shown in FIG. 2, the perforated plate 22 is perforated through the needle 21 of the hole-former 20. Therefore, when the needle 21 of the hole former 20 reciprocates to form the hole 11 in the foamed plastic sheet 10, the foamed plastic sheet 10 is trapped by the needle 21 and the hole former 20. To prevent reciprocating along.

In addition, the speed at which the foamed plastic sheet 10 is conveyed is preferably about 1 to 20 m / sec.

Here, although the hole molding machine 20 according to the present invention is an example of being positioned on the upper and lower portions of the foamed plastic sheet 10 to be transferred, it can be formed only in any one of the upper or lower portion to form the hole (11). Of course.

 Here, the thickness of the needle 21 of the hole molding machine 20 is approximately 0.1 ~ 2.0mm and the spacing between the needles 21 may be provided as 2.0 ~ 10mm, the number of the needle is 3000 to 10,000 per square meter desirable. In addition, the length of the needle 21 is longer than the length between the upper surface and the lower surface of the foamed plastic sheet 10 may allow the needle 21 to penetrate the foamed plastic sheet 10 but may be formed shorter. Of course.

In addition, the hole forming machine 20 to form a hole 11 by reciprocating up and down is composed of a needle plate with a plurality of needles 21 and a device equipped with a perforated plate 22 and the speed of drilling in the up and down reciprocating motion is It can be configured as a device with a regulator that can be freely adjusted up to several hundred times per minute for automation and continuous operation.

The step (B) of applying the expandable inorganic flame retardant material 12 to the surface of the foamed plastic sheet 10 is performed on the surface of the foamed plastic sheet 10 including a portion in which the hole 11 is formed in the foamed plastic sheet 10. It means the step of applying the foamed inorganic flame retardant (12).

Here, the method of applying the foamable inorganic flame retardant material 12 is an example of applying the foamed inorganic flame retardant material 12 through the roller 30 buried in the upper, lower, upper and lower portions of the foamed plastic sheet 10 to be transferred. . In addition, as illustrated in FIG. 2, two rollers 40 are provided to prevent the occurrence of unapplied portions to reduce the probability of defective products. However, the present invention is not limited thereto.

In addition, since it can apply | coat using a nozzle (not shown), a brush, etc. instead of the roller 40, this invention is not limited by an application | coating system.

Here, the expandable inorganic flame retardant 12 includes one of sodium silicate (Na ₂ SiO ₃ ), potassium silicate (K ₂ SiO ₃ ), colloidal silica, lithium silicate (Li ₄ SiO ₄ ), or a mixture of two or more thereof. Liquid silicate inorganic flame retardant, potassium bicarbonate (K ₂ CO ₃ : potassium hydrogen carbonate Kalium), sodium bicarbonate (NaHCO ₃ : It means the flame retardant which mixed the foaming agent containing any one of sodium bicarbonate) and azodicarbonamid.

That is, the liquid silicic acid-based inorganic flame retardant of the foamable inorganic flame retardant 12 of the present invention is a non-flammable, inorganic heat resistance that is not easily melted even at a high temperature of more than 1,200 degrees Celsius, and does not eject harmful gases of chemical components even at high temperature heat. Sodium silicate and silicic acid consisting of silicon dioxide (SiO ₂ ) and other sodium (Na), potassium (K), lithium (Lithum), etc., combined with silicon dioxide and dissolved in an aqueous solution with hydroxyl (OH +) Silicium-based compounds such as potassium, colloidal silica and lithium silicate are mainly used.

Here, sodium silicate is generally referred to as water soluble glass or sodium silicate, and the molecular formula may be represented by Na ₂ O.nSiO ₂ .xH ₂ O. That is, sodium silicate is composed of silicon dioxide and soda (Na ₂ O) combined with hydroxyl group (OH-), and the content ratio of silicon dioxide can be selected and used as needed in various types up to 10-40%. In the present invention, it is preferable to use sodium silicate having a content ratio of 30 to 40%.

In addition, as a liquid silicic acid-based inorganic flame retardant of the expandable inorganic flame retardant material 12 of the present invention, potassium silicate having a molecular formula of K ₂ O.nSiO ₂ .xH ₂ O and a silicon dioxide / K ₂ O content ratio of 10 to 45% can be used. have. Among them, potassium silicate in a content ratio of 20-30% is inexpensive and preferable to exhibit a flame retardant function.

Therefore, the liquid silicate-based inorganic flame retardant of the expandable inorganic flame retardant 12 of the present invention can be selectively provided with sodium silicate or potassium silicate according to the use.

In addition, the liquid inorganic silicic acid-based inorganic flame retardant of the foamed inorganic flame retardant (12) according to the present invention comprises a content ratio of 10 to 50% in a state of being combined with silicon dioxide (SiO ₂ ) and a hydroxyl group (OH-), and grouped colo Silica is available this month.

Here, colloidal silica is generally a particle size of 1 ~ 100nm and particles that are stably dispersed in a solvent without sedimentation is colloidal solute is silica material. Colloidal silica has a number of hydroxyl groups (OH) on the surface, and has a siloxane bond (Si-O-Si) inside it is characterized by bonding, heat resistance, film formation and adsorption.

In addition, the lithium silicate in liquid form, which combines and disperses lithium (Lithium), an excellent compounding agent, is the lightest metal element with a specific gravity of 0.543 among the solid elements in colloidal silica, and is composed of a liquid state in a stable state with high water resistance, high heat resistance, and low temperature. Therefore, it can be used as a foamable inorganic flame retardant (12).

In addition, the foamable inorganic flame retardant 12 of the present invention is mixed with a foaming agent having a self-extinguishing and foaming property to the liquid inorganic flame retardant, foamed by a temperature and heat of more than 160 degrees Celsius generated in the event of a fire, the low density foam located around It spreads the components of silicon dioxide, sodium, potassium, etc. in the material of the plastic sheet 10 such as polystyrene or expanded polyvinyl chloride resin, and discharges and digests nitrogen and carbon dioxide.

Here, sodium bicarbonate dissolves well in water or a liquid with hydroxyl groups, and generates carbon dioxide gas even at 70 ~ 80 ℃. In case of fire, 2NaHCO ₃ is Na ₂ CO ₃ + H ₂ Turns into O + CO ₂ . Thus, sodium bicarbonate foams while releasing water (H ₂ O) and carbon dioxide (CO ₂ ) to perform a digestive function.

Accordingly, the expandable inorganic flame retardant 12 may be formed by mixing from 93% to 99% by weight of the silicic acid-based inorganic flame retardant with 1% to 7% by weight of sodium bicarbonate.

In addition, when mixed with the silicate-based inorganic flame retardant of the present invention using sodium bicarbonate, citric acid (C ₆ H ₈ O ₇ ) or tartaric acid (C ₂ H ₆ ) to enhance the foaming and extinguishing action O ₆ ) may be added to 40% by weight or less relative to 100% by weight of sodium bicarbonate to enhance foaming and extinguishing.

At this time, 1% to 7% by weight of complex sodium bicarbonate, in which 60% to 99% by weight of sodium bicarbonate is mixed with 1% to 40% by weight of citric acid or tartaric acid, 93% to 99% by weight of silicate inorganic flame retardant It is possible to form the expandable inorganic flame retardant material 12 by mixing in%.

In addition, it is possible to use potassium bicarbonate (KHCO ₃ ) that discharges potassium and carbon dioxide as a foaming agent that combines foaming and flame retardancy, and foaming and extinguishing.

Thus, by mixing 93% to 99% by weight of silicic acid-based inorganic flame retardant 1% by weight to 7% by weight of potassium bicarbonate may emit carbon dioxide in the event of a fire can form a foamable inorganic flame retardant 12 having a foaming and extinguishing action.

In addition, 1% by weight of azodicarbonamid, which is digested by discharging nitrogen and ammonia in a volume of 220 to 260 ml / g at a temperature of 205 degrees Celsius or more with 93 to 99% by weight of silicic acid-based inorganic flame retardant. By mixing to 7% by weight to form a foamable inorganic flame retardant (12).

Here, OBSH (Oxybis Benzene Sulfonyl Hydrazide), DPT (Dinitroso Pentametylene), which is a blowing agent and flame retardant having a foaming and extinguishing effect similar to azodicarbonamide instead of azodicarbonamide as a blowing agent and discharging more than 200 ml / g of nitrogen at 160 degrees Celsius or more. Tetamine), PSH (P-Toluene Sulfonyl Hydrazide), PTSS (P-Toluene Sulfonyl Semicarbazide) may be used in place of.

Accordingly, when the foamed inorganic base flame retardant 12 is mixed with a foaming agent in a liquid silicic acid-based inorganic flame retardant, and applied to the holes 11 and the surface of the foamed plastic sheet 10, the foamed inorganic flame retardant 12 is lattice-type fireproof. A film is formed to confine the resin of the foamed plastic sheet 10.

When the fire occurs in this state, the foaming agent expands the components such as silicon dioxide and potassium of the silicon-based inorganic flame retardant mixed with foaming in the form of a lump cloud rapidly formed by the flame and heat of the fire, and the surrounding foam plastic sheet ( It spreads in the form of enclosing the resin of 10) to block the flame and heat of fire, to block the phenomenon of combustion by supplying oxygen in the outside air, and to suppress the generation of harmful gas.

In the case where sodium silicate and potassium silicate are used as the expandable inorganic flame retardant 12, the sodium and potassium components, respectively, are hydrophilic and may cause dissolution.

Here, leaching means that when the sodium and potassium components of sodium silicate and potassium silicate come into contact with moisture, the foamed inorganic flame retardant 12 applied to the foamed plastic sheet 10 is released in response to moisture.

Therefore, the silicate-based inorganic flame retardant constituting the expandable inorganic flame retardant 12 according to the present invention may be provided with sodium silicate, potassium silicate, lithium silicate and colloidal silica, but in accordance with the use and required flame retardancy and anti-spill function Two or more of sodium, potassium silicate, lithium silicate and colloidal silica may be used in combination with each other.

That is, since it is silicic acid (SiO ₂ ) which substantially performs the flame retardant function, the silicic acid-based inorganic flame retardant of the expandable inorganic flame retardant 12 of the present invention ion exchanges a component ratio of sodium and potassium which are highly likely to be leached from sodium silicate and potassium silicate. After reducing by resin or dialysis, etc., 80% by weight of sodium silicate or potassium silicate with reduced content of sodium or potassium and 20% by weight of colloidal silica mixed with modified 80% sodium silicate and modified 80% potassium silicate Can be prepared. In addition, the silicate-based inorganic flame retardant of the expandable inorganic flame retardant material 12 of the present invention is 80% by weight of colloidal silica to 20% by weight of sodium silicate or potassium silicate in which sodium or potassium is removed from sodium silicate or potassium silicate by ion exchange resin or dialysis. It can be prepared by mixing 20% modified sodium silicate and 20% modified potassium silicate.

Here, 20% by weight of potassium silicate or sodium silicate having a reduced content of sodium or potassium and 80% by weight of colloidal silica, and 80% by weight of colloidal silica with 80% by weight of potassium silicate or sodium silicate having a reduced content of sodium or potassium When it becomes turbid, the starch concentration is changed to a thick paste (or a low viscosity jelly state) and injected into a hole drilled into the foamed plastic sheet, or it is difficult to apply, and the adhesive is also difficult to use because it is difficult to use.

Uniform coating step (C) is a squeeze 40, a brush (not shown) so that the hole 11 and the foamed inorganic flame retardant 12 applied to the surface of the foamed plastic sheet 10 having a hole 11 is evenly applied It is the step of spreading uniformly. The number of uniform coatings is one example in correspondence with the number of times the foamed inorganic flame retardant 12 is applied to the roller 30, but is not limited thereto.

Thus, the applied foamable inorganic flame retardant material 12 is uniformly applied to the foamed plastic surface, as well as the foamable inorganic flame retardant material is impregnated and applied to the hole 11. Therefore, as shown in FIG. 4, the foamed plastic sheet is coated with the foamable inorganic flame retardant material 12 to become the flame retardant foam plastic sheet 13.

Forming a hole (11) in the foamed plastic sheet (10), applying a foamable inorganic flame retardant (12) to the surface of the foamed plastic sheet (10), and uniformly applying ( When the hot air is dried through a step (not shown) of drying the flame-retardant foamed plastic sheet 13 manufactured through C), a flame-retardant foamed plastic sheet 13 which can be used as a core material of the metal composite panel is manufactured.

Here, the process may be repeated by varying the configuration of the expandable inorganic flame retardant material 12 so that the expandable inorganic flame retardant material 12 may be laminated on the flame retardant foam plastic sheet 13.

On the other hand, in the present description, the foamed inorganic flame retardant 12 is applied to the entire surface of the foamed plastic sheet 10 as an example, it is also possible to apply a portion of the foamed plastic sheet 10 in some cases. In addition, the number of times of application of the foamable inorganic flame retardant 12 and the number of uniform coatings may also be adjusted depending on the case.

In addition, the flame retardant foam plastic sheet 13 coated with the foamed inorganic flame retardant material 12 of the present invention is intended to be composed of the inner core material of the metal composite panel, and finally the metal panel is attached to the surface of the flame retardant foam plastic sheet 13. As an adhesive, a flame retardant adhesive including a liquid flame retardant such as ammonium phosphate may be applied to melamine, urea, phenol, or acrylic resin of thermosetting resin having both adhesiveness and flame retardancy.

Then, a metal composite panel using the flame retardant foam plastic sheet 13 may be prepared by attaching a metal sheet made of a material such as aluminum to the surface of the flame retardant foam plastic sheet 13 to which the flame retardant adhesive is applied.

That is, the flame-retardant adhesive is applied to attach the metal panel to the surface of the flame-retardant foam plastic sheet 13 when manufacturing the composite metal panel with the flame-retardant foam plastic sheet 13 of the present invention. Here, the flame-retardant adhesive includes the components of the flame retardant material, but there is no extinguishing and foaming properties claimed in the present invention.

However, the flame-retardant adhesive can be applied to the foamed inorganic flame retardant (12, 15) once or twice, dried and then laminated again on both surfaces of the dried flame-retardant foamed plastic sheet or used as an adhesive to attach a metal sheet. Therefore, the flame retardant adhesive is mixed with the foamed inorganic flame retardant materials 12 and 15 and filled in the holes 10 of the foamed plastic sheet 10 before the aluminum sheet or the metal sheet is attached to the foamed plastic sheet 10. It is claimed that the case of coating on the surface of is also within the scope of the present invention.

That is, in the case of using a lamination type, the manufacturing process shown in FIG. 2 is repeated, and the roller 30 is coated with a flame retardant adhesive instead of the foamed inorganic flame retardant 12, and the foamed inorganic flame retardant 12 is coated on the surface. It is possible to apply a lamination method. Thus, the flame-retardant foam plastic sheet 13 according to the present invention can be further complemented in flame retardancy and adhesion.

Therefore, when the liquid foamable inorganic flame retardant and the flame retardant adhesive of the present invention described above are coated and the liquid foamable inorganic flame retardant (12,15) is coated on the holes and both surfaces of the foamed plastic sheet 10 produced by the extrusion foaming method. , Sodium, potassium or lithium components and the components of the silicon dioxide and hydroxyl groups are dried and applied to the flame-retardant foam plastic sheet when the contact with the thermal energy of the temperature of 160 ℃ or more caused by the fire caused by the foaming agent of the blowing agent Carbon dioxide, or nitrogen and water (H2O) and other components are discharged together and foamed. Thus, the silicon dioxide particles of the expandable inorganic flame retardant (12, 15) is expanded in a moment within 1-2 seconds. Thus, the resin of the foamed plastic sheet 10 in a state in which the silicon dioxide expands and expands in a glass wool state and melts due to fire in the surroundings, thereby reducing the volume or the connected bonding portion of the foamed plastic sheet 10 is separated. Will wrap. Accordingly, the silicon dioxide wrapped in the resin of the foamed plastic sheet 10 melts the resin of the foamed plastic sheet 10 so that the flame of the fire does not continue, and performs a flame retardant function to block high heat and suppress generation of harmful gases.

An experiment on the flame retardant action due to the fire will be described with reference to FIGS. 7 to 13.

As shown in FIG. 7, two expanded polystyrene sheets having a foaming ratio of 13 times and a density of 0.13 g / Cm ³ having a thickness of 5 mm and a width of 50 mm and a length of 150 mm were prepared in the same standard produced by the extrusion foaming method.

And, as shown in Figure 8, a hole was formed in one of the two expanded polystyrene sheets. And, as shown in Figure 9, the foamed inorganic flame retardant 12 according to the present invention was applied to the hole and the surface of the foamed polystyrene sheet having a hole to prepare a flame-retardant foam polystyrene sheet.

 Here, the flame-retardant polystyrene sheet of Figure 9 is first drilled through the holes in the foamed polystyrene sheet and coated with a modified 80% sodium silicate on the surface and holes, and then drilled twice in a second time to denature 80% sodium silicate 95 weight After mixing 5% by weight 5g of sodium bicarbonate 5g to% 950g and applying a foamed inorganic flame retardant (12) made by stirring at room temperature for 3 minutes was prepared by drying for about 3 minutes with hot air of hot air temperature 60 ℃.

In addition, a gas burner having a flame length of 12 to 15 cm as shown in FIG. 10 and having a flame end temperature of 1,200 degrees to 1,400 degrees was prepared.

Then, as shown in FIG. 11, the non-flame-retardant expanded polystyrene sheet was laid horizontally, and a flame of about 1,200 degrees Celsius was applied at a flame length of 12-15 Cm for about 1 to 1.5 seconds.

In addition, as shown in FIG. 12, a flame was also applied to the flame-retardant polystyrene sheet coated with the expandable inorganic flame retardant material 12 in the same manner.

As a result, as shown in FIG. 13, the non-flame-retardant expanded polystyrene sheet had a flame between 1 and 1.5 seconds, and 12-13Cm of the total length of 15Cm melted quickly with the black carbonized smoke and turned into a jelly state. Afterglow continued with flames remaining.

In comparison, the flame retardant polystyrene sheet yellow with the foamed inorganic flame retardant (12) was produced, but it was reduced within 1 second, and a very small amount of black smoke was generated. In addition, the black carbon traces and the area were extremely small, and the flame retardant foam plastic sheet portion in contact with the flame and the high temperature showed a phenomenon that silicon dioxide expanded and foamed in the form of small glass wool to protrude.

In addition, the resin of the flame-retardant foam plastic sheet can be seen to be separated into small grains to partially fall off or to maintain the shape in their place. In addition, there was no phenomenon that the flame remnants occurred continuously or melted and dropped to the bottom, and the length of the specimen remained 12-13 cm in length.

Although embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that the present embodiments may be modified without departing from the spirit or spirit of the invention. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.

According to the above configuration, the present invention has the effect of producing a foamed flame retardant foamed plastic sheet which can be mass-produced within a short time by applying a foamed inorganic flame retardant to a foamed plastic sheet mass produced by an extrusion method.

In addition, the foamed flame-retardant foam plastic sheet produced according to the present invention is characterized by the characteristics of silicon dioxide and foamed inorganic flame retardant composition in the event of a fire by the action of foaming and extinguishing with the foamed plastic sheet resin in a heat of 150 degrees Celsius or more, the residual flames continue to There is an effect that prevents the occurrence or melted plastic foam flow or transfer the flame and also prevent the foamed plastic material is almost disappeared by melting or disappearing.

In addition, the silicic acid-based inorganic flame retardant or liquid foamed inorganic flame retardant of one of the present invention is composed mainly of silicon dioxide, which is almost natural and non-toxic, and thus contains harmful or toxic chemical components as in the case of flame retardants of other organic materials or metal salts. Therefore, it is effective to reduce the loss of life and property by suppressing the dangerous occurrence such as respiratory suffocation, which is harmful to human body due to the generation of harmful gas due to fire.

Claims (3)

93 wt% to a liquid silicic acid-based inorganic flame retardant formed of a plurality of holes in the foamed plastic sheet produced by the extrusion foaming method, and containing one of sodium silicate, potassium silicate, colloidal silica and lithium silicate or mixing two or more thereof 99% by weight and any one of sodium bicarbonate, potassium bicarbonate, azodicarbonamide, Oxybis Benzene Sulfonyl Hydrazide (OBSH), Dinitroso Pentametylene Tetamine (DPT), P-Toluene Sulfonyl Hydrazide (TSH) and P-Toluene Sulfonyl Semicarbazide (PTSS) A method of manufacturing a flame-retardant foamed plastic sheet comprising the step of applying the foamed inorganic flame retardant mixed with a foaming agent comprising 1% by weight to 7% by weight to the hole and the surface of the foamed plastic sheet two or more times. The method of claim 1, Forming a plurality of holes in the foamed plastic sheet, and applying the foamable inorganic flame retardant to the surface and the hole of the foamed plastic sheet Forming a hole in the foamed plastic sheet with a hole molding machine having a plurality of needles and a perforated plate positioned between the needles and the foamed plastic sheet to penetrate the needle; Applying the foamable inorganic flame retardant to the surface of the foamed plastic sheet having the hole; Uniformly applying the expandable inorganic flame retardant applied to the surface of the foamed plastic sheet with a squeeze or a brush; Flame-retardant foam plastic sheet manufacturing method comprising the step of drying the surface of the uniformly coated foamed plastic sheet. Applying the surface of the flame-retardant foamed plastic sheet prepared by claim 1 or 2 with a flame-retardant adhesive added with ammonium phosphate to melamine, phenol, urea or acrylic resin; Method for manufacturing a metal composite panel comprising an inner core material of the flame-retardant foam plastic sheet comprising the step of attaching a metal sheet on the surface of the flame-retardant foam plastic sheet coated with the flame-retardant adhesive.

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