KR102130654B1 - Sandwich Panel Containing Wafer Board And Preparation Method Thereof - Google Patents

Abstract

The present invention relates to a sandwich panel comprising a Wehas board and a method for manufacturing a sandwich panel including the Wehas board, wherein the sandwich panel according to the present invention comprises a Wehas board with a plurality of polyester foam sheets laminated with a resin foam. The emission of harmful substances such as volatile organic compounds is reduced, and light weight and thermal stability are improved to prevent deformation due to heat during work, and may not be harmful to the human body.

Description

Sandwich Panel Containing Wahas Board and its Manufacturing Method Thereof

The present invention relates to a sandwich panel comprising a Wehas board and a method for manufacturing a sandwich panel comprising the Wehas board.

Sandwich panels are special plywoods with different types of materials stacked in a sandwich shape and glued together. In general, the surface plate is made of materials with high strength such as plastic plate, aluminum plate, stainless plate, and metal plate, and the core material is made of paper, wood, foam plastic, etc. in consideration of heat insulation, sound insulation, strength, etc. have.

This sandwich panel is one of the building materials used as a space partition or an outer wall by applying to a wall surface of a building that has already been built or shortened the construction period, and its application scope is expanded due to advantages such as simplicity of construction and shortening of the construction period. have.

In the conventional sandwich panel, a resin foam or an inorganic fiber plate is frequently used as the core material, and polyurethane, polystyrene, and phenol are mainly used as the resin foam, and glass fiber is mainly used as the inorganic fiber plate.

Polyurethane or polystyrene among the resin foams is mainly used as a sandwich plate due to its easy processing, but has a disadvantage of being vulnerable to fire due to lack of thermal stability, and phenol is used as a flame retardant material due to its excellent thermal stability, but has a disadvantage of corrosion of reinforcing bars. . In addition, among the inorganic fiber plates, the glass fiber is a non-combustible material and has excellent thermal stability, but has a disadvantage that is harmful to the human body due to the glass fiber powder during handling.

Due to these problems, in recent years, the application of a structural material made of a polyester foam sheet having a flame retardant performance and reduced toxic gas emission in the form of a sandwich panel has been expanded to lead the European market. However, in the case of the foaming equipment in the form of a board, a separate facility is required for the cooling process after foam production, so a lot of manufacturing space is required, and the investment cost of the equipment is high, so the blade can be applied to wind turbine blades and ship structural materials. There are limited drawbacks.

U.S. Patent No. 5000991

The present invention is to provide a sandwich panel comprising a Wehas board and a method for manufacturing a sandwich panel comprising the Wehas board.

In order to solve the above problem,

The present invention in one embodiment,

Wehas board;

A first plate material formed on one surface of the Wehas board;

A second plate member formed at a position opposite to the first plate member based on the Wehas board; And

And an adhesive dispersed between the first plate member, the second plate member, and the Weas board,

The weas board is n polyester foam sheet is laminated, the n is an integer of 2 or more, the hot bowel shrinkage ratio of the hash board is 10% or less under the condition that elapses for 1 hour at 100 ℃,

The polyester foam sheet provides a sandwich panel satisfying the following general formula (1):

[Formula 1]

X/Y ≥ 1.5;

In the general formula 1, X represents the compressive strength (N/cm ² ) of the resin foam layer according to KS M ISO 844, and Y represents the density (kg/m ³ ) of the resin foam layer according to KS M ISO 845.

In addition, the present invention in one embodiment,

Applying an adhesive resin to the surface of the Wehas board;

Bonding the panel to the surface coated with the adhesive resin using a pressure roller; And

It includes the step of cutting the continuous product in which the Wahas board and the panel are integrated into a unit size.

The weas board is n polyester foam sheet is laminated, the n is an integer of 2 or more, the hot bowel shrinkage ratio of the hash board is 10% or less under the condition that elapses for 1 hour at 100 ℃,

The polyester foam sheet provides a method for manufacturing a sandwich panel that satisfies the following general formula (1):

[Formula 1]

X/Y ≥ 1.5;

In the general formula 1, X represents the compressive strength (N/cm ² ) of the resin foam layer according to KS M ISO 844, and Y represents the density (kg/m ³ ) of the resin foam layer according to KS M ISO 845.

Sandwich panels according to the present invention, by including a Wehath board with a plurality of polyester foam sheets laminated with a resin foam, the emission of harmful substances such as volatile organic compounds is reduced, lightness and thermal stability is improved, deformation by heat during work And may not be harmful to the human body.

In addition, by performing the post-foaming process by heating the polyester foam sheet by heating the polyester foam sheet, it is possible to prevent the phenomenon of post-foaming when heat is applied to the work using the thermal foam, and by performing thermal adhesion using a roller. There is an advantage that the processability is improved and the volatile organic compounds (VOC) are reduced by not using an adhesive.

1 schematically shows a method of manufacturing a Weas board according to Example 1 of the present invention.

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description.

However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In the present invention, terms such as “comprises” or “have” are intended to indicate that there are features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

Hereinafter, the present invention will be described in detail.

The present invention relates to a sandwich panel comprising a Wehas board and a method for manufacturing a sandwich panel comprising the Wehas board.

Specifically, the present invention is a Wehas board; A first plate material formed on one surface of the Wehas board; A second plate member formed at a position opposite to the first plate member based on the Wehas board; And an adhesive dispersed between the first plate, the second plate, and the Weas board, wherein the Weas board is formed by laminating n polyester foam sheets, wherein n is an integer of 2 or more, and the hot line of the Weas board. The shrinkage rate is 10% or less at 100°C for 1 hour, and the polyester foam sheet can provide a sandwich panel satisfying the following general formula 1:

[Formula 1]

X/Y = 1.5

In the general formula 1, X represents the compressive strength (N/cm ² ) of the resin foam layer according to KS M ISO 844, and Y represents the density (kg/m ³ ) of the resin foam layer according to KS M ISO 845.

The Wehas board may be a post-foamed n-polyester foam sheet, and the n may be 2 to 50, 3 to 45, 4 to 40, 5 to 35 or 6 to 30. Depending on the application, the number of post-foamed polyester foam sheets can be adjusted. The Wehas board according to the present invention can be used in various industrial fields such as building materials, automobile materials, and food containers.

In addition, the hot bowel shrinkage rate of the Wehas board is 9% or less, 8% or less, 0.0001 to 7%, 0.001 to 6.5%, or 0.01 to 6%, 0.01 to 5.5%, or 5% or less at 100°C for 1 hour. However, if the hot bow axis ratio satisfies the above range, it is possible to prevent the shape from being deformed when heat is applied to the Wahas board.

The k-th polyester foam sheet has a melting point of 180°C to 250°C or a softening point of 100°C to 150°C, and a k+1st polyester foam sheet has a melting point higher than 250°C, and k is 1 to n- It can be an integer between 1. For example, the melting point (Tm) of the k-th polyester foam sheet is 180°C to 250°C, 185°C to 245°C, 190°C to 240°C, 180°C to 200°C, 200°C to 230°C, or 195°C It may be to 230 ℃, the softening point may be 110 ℃ to 145 ℃, 115 ℃ to 140 ℃, 120 ℃ to 135 ℃, or 125 ℃ to 130 ℃. By including a polyester foam sheet having a melting point or softening point in the above range, the Wehas board can implement excellent adhesion.

In addition, the melting point of the k+1st polyester foam sheet may be 250°C or higher, 255 to 300°C, 260 to 295°C, 265 to 290°C, or 270 to 285°C. By including a polyester foam sheet having a melting point or softening point in the above range, it is possible to provide a Wehas board that realizes excellent adhesion and satisfies excellent thermal stability.

The Wahas board is formed by laminating n polyester foam sheets, and may not include a separate adhesive layer between the polyester foam sheets. Since the WHEAS board is a form in which a polyester foam sheet whose surface is melted by heating is heat-sealed, it does not include an adhesive between each polyester foam sheet, and accordingly, the WHATS board is made of volatile organic compounds (VOC). Emissions are effectively reduced.

The polyester foam sheet has a water absorption of 1 g/100 cm ² based on KS M IOS 7214. It may be: For example, the polyester foam sheet has a water absorption of 1 g/100 cm ² based on KS M IOS 7214. Less than, 0.7 g/100 cm ² Less than, 0.6 g/100 cm ² Hereinafter, it may be 0.01 to 0.5 g/100 cm ² or 0.1 to 0.4 g/100 cm ² . When the absorbent amount of the polyester foam sheet is within the above range, there is an advantage of easy external storage.

The density to compression strength ratio of the polyester foam sheet according to the present invention may range from 1.5 to 3, 1.6 to 2.5 or 1.7 to 2. The polyester foam sheet according to the present invention can satisfy the compressive strength ratio compared to the density in the above range, thereby achieving a high foaming ratio and high strength polyester foam sheet. This may mean that in the polyester foam sheet according to the present invention, the foaming agent is well collected in the resin foam layer, and the pores are not bonded to each other, and closed cells are formed independently, and thus excellent thermal insulation properties can be expected.

In the general formula 1, the compressive strength of the polyester foam sheet (KS M ISO 844) X may be 20 to 300 N/cm ² , the density of the polyester foam sheet (KS M ISO 845) Y is 20 to 80 kg /m ³ . For example, the compressive strength of the polyester foam sheet may be 20 to 300 N/cm ² , 25 to 200 N/cm ² , 30 to 100 N/cm ² , or 35 to 80 N/cm ² , density May be 20 to 80 kg/m ³ , 25 to 75 kg/m ³ , or 30 to 70 kg/m ³ . When the compressive strength and density of the polyester foam sheet according to the present invention satisfy the above range, the strength of the sandwich panel produced using the polyester foam sheet is effectively improved.

The polyester foam sheet may have a total emission heat of 8 MJ/m ² or less based on KS F 5660-1, for example, 0.01 to 7.5 MJ/m ² , 0.05 to 7 MJ/m ² , 0.1 to 5 MJ/m ² , or 0.15 to 3 MJ/m ² .

As an example, the polyester foam sheet according to the present invention may have a flame retardance of 2 or higher based on KS F 4724. When the flame retardant grade of the polyester foam sheet is the above grade, it may exhibit semi-combustible performance. Therefore, the sandwich panel comprising the polyester foam sheet according to the present invention can maintain a stable shape even at high temperatures by having the total amount of heat released and flame retardant in the above range.

Specifically, the types of polyesters usable in the present invention include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), poly lactic acid (PLA), and polyglycolic acid Polyglycolic acid (PGA), Polypropylene (PP), Polyethylene (PE), Polyethylene adipate (PEA), Polyhydroalkanoate (PHA), Polytrimethylene terephthalate It may be at least one selected from the group consisting of (Polytrimethylene Terephthalate, PTT) and polyethylene naphthalate (PEN).

Specifically, the polyester foam sheet may be a polyethylene terephthalate (PET) foam sheet.

As an example, the polyester foam sheet according to the present invention may be a polyester foam sheet in which at least 90% of cells are closed cells (DIN ISO4590). This may mean that the measured value according to DIN ISO4590 of the foam sheet of the polyester resin is 90% or more of the cells. For example, the closed cell of the foam sheet of the polyester resin may be 90 to 100% or 95 to 100%.

The polyester foam sheet according to the present invention can provide a foam sheet satisfying excellent light weight, durability and rigidity by having a closed cell within the above range. For example, the number of cells of the polyester foam sheet is 1 mm ² Sugar may contain 1 to 30 cells, 3 to 25 cells, or 3 to 20 cells.

In addition, the average size of the cells may range from 100 to 800 μm. For example, the average size of the cells may range from 100 to 700 μm, 200 to 600 μm, or 300 to 600 μm. At this time, the variation in cell size may be, for example, 5% or less, 0.1 to 5%, and 0.1 to 4% to 0.1 to 3%. Through this, it can be seen that the polyester foam sheet according to the present invention uniformly foamed cells.

The polyester foam sheet according to the present invention may have a hydrophilicity function, a waterproofing function, a flame retardant function or a UV blocking function, and a surfactant, a UV blocking agent, a hydrophilizing agent, a flame retardant, a heat stabilizer, a waterproofing agent, a cell size expander, and infrared rays It may further include one or more functional additives selected from the group consisting of attenuators, plasticizers, fire retardant chemicals, pigments, elastomers, extrusion aids, antioxidants, nucleating agents, anti-static agents and UV absorbers. Specifically, the polyester foam sheet of the present invention may include a thickener, a nucleating agent, a heat stabilizer and a foaming agent. The thickener is not particularly limited, but in the present invention, for example, pyromellitic dianhydride (PMDA) may be used.

Examples of the nucleating agent, talc, mica, silica, diatomaceous earth, alumina, titanium oxide, zinc oxide, magnesium oxide, magnesium hydroxide, aluminum hydroxide, calcium hydroxide, potassium carbonate, calcium carbonate, magnesium carbonate, calcium sulfate, barium sulfate , Inorganic compounds such as sodium hydrogen carbonate and glass beads. Such a nucleating agent may serve to impart the functionality of a polyester foam sheet, reduce the cost, and the like. Specifically, talc may be used in the present invention.

The heat stabilizer may be an organic or inorganic phosphorus compound. The organic or inorganic phosphorus compound may be, for example, phosphoric acid and its organic ester, phosphorous acid and its organic ester. For example, the thermal stabilizer is a commercially available material, and may be phosphoric acid, alkyl phosphate or aryl phosphate. Specifically, in the present invention, the thermal stabilizer may be triphenyl phosphate, but is not limited thereto. If the thermal stability of the polyester foam sheet can be improved, it can be used without limitation within a typical range.

Examples of the foaming agent include N ₂ , CO ₂ , freon, butane, pentane, neopentane, hexane, isohexane, heptane, isoheptane, methyl chloride, or a physical foaming agent or azodicarbonamide-based compound, P, P'-oxybis(benzenesulfonylhydrazide)[P,P'-oxybis(benzene sulfonyl hydrazide)] compound, N,N'-dinitrosopentamethylenetetramine (N,N'-dinitroso pentamethylene tetramine ) There are chemical blowing agents such as compounds, and specifically, CO ₂ may be used in the present invention.

The flame retardant is not particularly limited, but may include, for example, a bromine compound, a phosphorus or phosphorus compound, and an antimony compound. Bromine compounds include, for example, tetrabromo bisphenol A, decabromodiphenyl ether, and the like, and phosphorus or phosphorus compounds include aromatic phosphate esters, aromatic condensed phosphate esters, halogenated phosphate esters, reds, and the like, and antimony compounds are Antimony trioxide, antimony pentoxide, and the like.

The surfactant is not particularly limited, and anionic surfactants (e.g., fatty acid salts, alkyl sulfate ester salts, alkylbenzene sulfonate salts, alkyl naphthalene sulfonate salts, alkyl sulfosuccinate salts, polyoxyethylene alkyl sulfate ester salts, etc.) , Nonionic surfactants (for example, polyoxyalkylene alkyl ethers such as polyoxyethylene alkyl ethers, polyoxyethylene derivatives, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol fatty acid esters, Glycerin fatty acid esters, polyoxyethylene alkylamines, alkyl alkanolamides, etc.), cationic and amphoteric surfactants (eg, alkylamine salts, quaternary ammonium salts, alkylbetaines, amine oxides, etc.) and water-soluble polymers Or protective colloids (e.g. gelatin, methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, polyethylene glycol, polyoxyethylene-polyoxypropylene block copolymer, polyacrylamide, polyacrylic acid, polyacrylic Acid salt, sodium alginate, polyvinyl alcohol partial saponification, etc.).

The waterproofing agent is not particularly limited, for example, silicone-based, epoxy-based, cyano-acrylic acid-based, polyvinyl acrylate-based, ethylene vinyl acetate-based, acrylate-based, polychloroprene-based, polyurethane resins and polyester resins. And mixtures of a mixture series, a mixture series of polyol and polyurethane resin, a mixture series of acrylic polymer and polyurethane resin, a polyimide series, and a mixture series of cyanoacrylate and urethane.

The sunscreen is not particularly limited, and may be, for example, an organic or inorganic sunscreen, and examples of the organic sunscreen include p-aminobenzoic acid derivatives, benzylidene campo derivatives, cinnamic acid derivatives, benzophenone derivatives, and benzo Triazole derivatives and mixtures thereof, and examples of the inorganic sunscreen may include titanium dioxide, zinc oxide, manganese oxide, zirconium dioxide, cerium dioxide, and mixtures thereof.

The adhesive may include a polyester-based adhesive resin, for example, the adhesive resin may be in the form of a film capable of thermal adhesion, or may be dispersed between the first plate material, the second plate material and the Weas board in a composition state. have.

The Wahas board can be post-foamed by heating the polyester foam sheet, thereby preventing post-foaming when heat is applied to the work using the Wahas board, and separately adhesive by performing thermal adhesion using a roller. Since it does not use, the sandwich panel containing it has the advantage of reducing volatile organic compounds (VOC).

The sandwich panel according to the present invention may have a total volatile organic compounds (VOCs) content of 10 ppm or less. For example, the total volatile organic compound content may be 0.1 to 10 ppm, 8 ppm or less, 6 ppm or less, 4 ppm or less, 2 ppm or less, or 0.1 to 1 ppm.

The first plate and the second plate may each independently include one or more of metal, synthetic resin, cement, ceramic, gypsum board, and glass fiber reinforced plastic. Specifically, in the present invention, the first plate material and the second plate material may include glass fiber reinforced resin.

The thickness of the sandwich panel according to the present invention may be 3 to 50 cm, 5 to 45 cm, 7 to 40 cm, 10 to 35 cm, or 10 to 30 cm. In addition, the thickness of the polyester foam sheet according to the present invention may be 2 to 30 cm, 4 to 25 cm or 10 to 20 cm. In addition, the thickness of the first plate and the second plate according to the present invention may be 0.5 to 20 cm, 1 to 15 cm or 1.5 to 10 cm. Through this, it can be seen that the sandwich panel according to the present invention can realize characteristics such as excellent compressive strength, heat insulation and flame retardancy even with a relatively thin thickness. Therefore, it is possible to reduce the weight of the foamed molded product and reduce production costs.

In addition, the present invention is a step of applying an adhesive resin to the surface of the Wehas board; Bonding the panel to the surface coated with the adhesive resin using a pressure roller; And cutting a continuous product in which a unit and a panel of a hash board are integrated into a unit size, wherein the hash board is formed by laminating n polyester foam sheets, wherein n is an integer of 2 or more, and a hot line of the hash board. The shrinkage rate is 10% or less at 100° C. for 1 hour, and the polyester foam sheet can provide a method for preparing a sandwich panel satisfying the following general formula 1:

[Formula 1]

X/Y ≥ 1.5;

In the general formula 1, X represents the compressive strength (N/cm ² ) of the resin foam layer according to KS M ISO 844, and Y represents the density (kg/m ³ ) of the resin foam layer according to KS M ISO 845.

In the step of applying the adhesive resin, the adhesive resin may be a polyester-based adhesive resin. In addition, the adhesive resin may be various types of injection moldings, film (Film) moldings, and may be in the form of fibers (web). The adhesive resin has the characteristics of a low melting point and can be compressed in several layers to be provided in the form of a nonwoven fabric having a film or web structure.

The panel may include a second plate formed at a position opposite to the first plate based on the Wehas board, wherein the first plate and the second plate are each independently made of metal, synthetic resin, cement, ceramic, and gypsum board. It may include one or more. Specifically, in the present invention, the first plate material and the second plate material may be metal, and the metal may include a clad steel sheet.

The Wahas board, the step of performing post-foaming by heating the polyester foam sheet; And it may be formed by the step of laminating n the number of post-foamed polyester foam sheet, the n is an integer of 2 or more.

When post-foaming is performed by heating the polyester foam sheet, it may foam 1.5 to 2 times more than the foam magnification of the polyester foam sheet before heating.

As an example, the foaming ratio of the polyester foam sheet before heating may be 2 to 46 times. Specifically, the foaming magnification may be 5 to 45 times, 10 to 43 times, 12 to 42 times, or 13 to 40 times.

In addition, the foam ratio of the post-foamed polyester foam sheet may be 4 to 92 times, 7.5 to 90 times, 15 to 86 times, 18 to 84 times, and 19.5 to 80 times.

By heating the polyester foam sheet to perform post-foaming, the foam expansion ratio of the polyester foam sheet is increased, and accordingly, when heat is applied to the manufactured Wehas board, post-foaming occurs to prevent the shape from being deformed. can do.

The n may be 2 to 50, 3 to 45, 4 to 40, 5 to 35 or 6 to 30. Depending on the application, the number of post-foamed polyester foam sheets can be added or subtracted.

The step of performing post-foaming by heating the polyester foam sheet is performed by heating one or both sides of the polyester foam sheet to an average temperature in the range of 120 to 300°C, and in the step of performing the post-foaming, polyester The foam sheet may be in a state in which the heated surface is partially melted while post-foaming occurs.

Specifically, the temperature for heating one or both sides of the polyester foam sheet is 125 to 300°C, 130 to 290°C, 140 to 280°C, 150 to 270°C, 160 to 260°C, 170 to 250°C, 180 to 240°C Or 190 to 230°C. When performing the post-foaming according to the present invention, when the heating temperature of the polyester foam sheet is within the above range, the polyester foam sheet is easy to post-foam 1.5 to 2 times, and the heated polyester foam sheet surface can be melted to facilitate lamination. have. The surface of the melted polyester foam sheet can be easily heat-sealed between the foam sheet surfaces without an adhesive.

In the polyester foam sheet introduced in the step of laminating n of the post-foamed polyester foam sheets, a surface of one or both surfaces of the foam sheet may be partially melted. The surface of the melted polyester foam sheet can be easily heat-sealed between the foam sheet surfaces without an adhesive.

In the step of laminating n of the post-foamed polyester foam sheets, n polyester foam sheets having one or both surfaces partially melted are introduced, and n polyester foam sheets introduced are stacked in a stacked state. It can be laminated by a pressure roller.

The heated polyester foam sheet surface may be melted to facilitate lamination. The surface of the melted polyester foam sheet can be easily heat-sealed between the foam sheet surfaces without an adhesive, and n polyester foam sheets in which one or both surfaces are partially melted are pressed in a stacked state. By being laminated by a roller, it can be adhered strongly.

Heating the polyester foam sheet to perform post-foaming; And the step of laminating n the post-foamed polyester foam sheet may be performed continuously.

As an example, n polyester foam sheets are heated and post-foamed by passing between heaters formed in parallel in multiple layers by a conveyor belt, and the post-foamed n polyester foam sheets are pressurized rollers by a conveyor belt. By moving to the molten surface can be laminated. The conveyor belt can be excluded in some cases.

As another example, n polyester foam sheets are heated and post-foamed by passing each between heaters formed in parallel in multiple layers by a nip roller holding the front and rear ends in parallel. The n polyester foam sheets can be moved by a pressure roller to be laminated between the melted surfaces.

The method of manufacturing the Wehas board comprises the steps of preparing polyester foam sheets through extrusion foaming at n extruder stages; Heating the extruded polyester foam sheets, respectively, to perform post-foaming; And it is possible to continuously perform the step of laminating n the post-foamed polyester foam sheet.

As an example, the polyester foam sheet produced through extrusion foaming at n extruded stages is heated and post-foamed by passing between heaters formed in parallel in multiple layers by a conveyor belt, and post-foamed n polyesters The foam sheet may be moved to a pressure roller by a conveyor belt, and a process of laminating molten surfaces may be continuously performed.

After the step of laminating n of the post-foamed polyester foam sheets, the step of cooling the laminated laminate may be further performed. The cooling step may be cooled by a cooling roller while the laminated body of n polyester foam sheets laminated by a pressure roller moves by a conveyor belt. At this time, the cooling step is to solidify the bonding portion where the melted layer of the laminated body of the n-polyester foam sheets is laminated, or to further strengthen the adhesion between the polyester foam sheets to prevent the shape of the laminate from being distorted. Can be done.

As an example, in the cooling step, the temperature of the cooling roller is 15°C or less, 1 to 14.5°C, 1.5 to 14°C, 2 to 13.5°C to 2.5 to 13°C, 3 to 12.5°C, 3.5 to 12°C, 4 To 11.5°C or 4.5 to 10°C.

After the step of laminating n of the post-foamed polyester foam sheets, the step of cutting the laminated laminate at regular intervals may be further performed. The step of cutting may be cooled by a cutter that can be cut by a cutter while moving a stack of n polyester foam sheets laminated by a pressure roller by a conveyor belt.

In addition, the cutting step may be cut by a cutter while being moved by a conveyor belt after being cooled by passing through a cooling roller while the laminated body of n polyester foam sheets laminated by a pressure roller is moved by a conveyor belt. The method of manufacturing the weas board according to the present invention has an advantage of improving processability and facilitating mass production by performing a process of cutting a laminated laminate by a cutter.

A method of manufacturing a Wehas board according to the present invention comprises the steps of: manufacturing a polyester foam sheet through extrusion foaming in n extruder stages; Heating the extruded polyester foam sheets, respectively, to perform post-foaming; Laminating n post-foamed polyester foam sheets; Cooling the laminated laminate; And cutting the laminated laminate at regular intervals.

Specifically, the polyester foam sheet produced through extrusion foaming at n extruded bases is heated and post-foamed by passing between heaters formed in parallel in multiple layers by a conveyor belt, and then post-foamed n polyester foam sheets Is moved to the pressure roller by the conveyor belt, and the melted surfaces are laminated together, and the laminated laminate is moved to the cooling roller by the conveyor belt to cool the molten part, and the laminate past the cooling roller is cut by the conveyor belt. The process of cutting at regular intervals while passing through may be continuously performed. The method of manufacturing the weas board of the present invention has an effect of reducing the process time and cost by continuously performing the foaming, heating, laminating, cooling, and cutting processes as described above.

As an example, n polyester foam sheets are heated and post-foamed while passing between heaters formed in multiple layers by a conveyor belt, and the post-foamed n polyester foam sheets are moved to a pressure roller by a conveyor belt. Thus, the molten surfaces can be laminated.

The multi-layered heater may have n+1 parallel to heat both sides of each of the n polyester foam sheets. In addition, n-1 pieces may be formed in parallel in order to heat only the surface to which each of the n polyester foam sheets is laminated. At this time, the heating temperature of the heater formed in a multilayer is 120 to 300°C, 130 to 295°C, 140 to 290°C, 150 to 285°C, 160 to 280°C, 170 to 275°C, 190 to 270°C, 200 to 265°C, or 230 to 260°C. When the heating temperature of the multi-layer heater is within the above range, the polyester foam sheet may be post-foamed 1.5 to 2 times while the heated polyester foam sheet surface may be melted to facilitate lamination. The surface of the melted polyester foam sheet can be easily heat-bonded between the foam sheet surfaces by a pressure roller without an adhesive. The heat-sealed laminate can then be cooled by a cooling roller, passed through the cooling roller and cut by a cutter to complete manufacturing of the Weas board. The method of manufacturing the Wehas board that can be continuously produced in this way is easy to mass-produce and has an advantage of shortening the production time.

In the step of laminating n of the post-foamed polyester foam sheets, a low-melting-point (LM) polyester resin layer or resin powder may be placed between the polyester foam sheets.

To improve the bonding strength between the polyester foam sheets, a low melting point (LM) polyester resin layer or resin powder is placed between each polyester foam sheet and melts even at a relatively low heating temperature to facilitate lamination of the polyester foam sheet. You can do it.

The low-melting point (LM) means a resin layer or resin powder that melts at a predetermined low temperature of the polyester resin layer or resin powder, specifically, at a temperature lower than the melting point of the polyester foam sheet and acts as an adhesive. , The polyester foam sheet may not melt at a temperature at which the low melting point polyester resin layer or resin powder is melted. Therefore, the low-melting-point polyester resin layer or the resin powder and the polyester foam sheet are melted with each other at a specific temperature, and may not be melted. For example, the melting point of the low melting point polyester resin layer or resin powder may be 70 to 120°C, in this case, the melting point of the polyester foam sheet may exceed 120°C or exceed 130°C. As another example, if the melting point of the low melting point polyester resin layer or resin powder is 80 to 100°C, the melting point of the polyester foam sheet may exceed 100°C or exceed 110°C.

As an example, the low-melting-point (LM) polyester resin layer or resin powder may be a resin layer or resin powder of a low-melting polyester resin comprising repeating units represented by the following Chemical Formulas 1 and 2.

[Formula 1]

;

;

[Formula 2]

;

;

In Formula 1 and Formula 2,

m and n represent the molar fraction of repeating units contained in the low melting point polyester resin,

n is 0.05 to 0.5 based on m+n=1.

The low melting point polyester resin may have a structure including repeating units represented by Chemical Formulas 1 and 2. The repeating unit represented by Chemical Formula 1 represents a repeating unit of polyethylene terephthalate (PET), and the repeating unit represented by Chemical Formula 2 improves tearing properties of a polyester resin comprising a repeating unit of polyethylene terephthalate (PET). Perform a function. Specifically, the repeating unit represented by Chemical Formula 2 includes a methyl group (-CH ₃ ) in the ethylene chain bound to terephthalate as a side chain to secure a space so that the main chain of the polymerized resin can rotate, thereby increasing the degree of freedom of the main chain and The melting point (Tm) may be lowered by inducing a decrease in crystallinity of the resin. This may exhibit the same effect as when using isophthalic acid (IPA) containing an asymmetric aromatic ring to lower the melting point (Tm) of a conventional crystalline polyester resin.

Furthermore, the low melting point polyester resin may have a glass transition temperature (Tg) of 60°C or higher. Specifically, the glass transition temperature may be 60 ℃ to 70 ℃, more specifically 61 ℃ to 69 ℃, 60 ℃ to 65 ℃, 63 ℃ to 67 ℃, 61 ℃ to 63 ℃, 63 ℃ to 65 ℃, 65 ℃ to 67 ℃ or 62 ℃ to 67 ℃.

In addition, the low-melting point resin may have an intrinsic viscosity (I.V) of 0.6 ㎗/g to 0.75 ㎗/g. Specifically, the intrinsic viscosity (IV) is 0.6 ㎗/g to 0.65 ㎗/g, 0.65 ㎗/g to 0.70 ㎗/g, 0.64 ㎗/g to 0.69 ㎗/g, 0.65 ㎗/g to 0.68 ㎗/g, 0.67 ㎗/g to 0.75 ㎗/g, 0.69 ㎗/g to 0.72 ㎗/g, 0.7 ㎗/g to 0.75 ㎗/g, or 0.63 ㎗/g to 0.67 ㎗/g.

The low-melting-point polyester resin according to the present invention can control the glass transition temperature (Tg) and intrinsic viscosity (IV) in the above range, including the repeating unit represented by Chemical Formula 2, and the resin whose physical properties are adjusted to the above range is excellent in adhesion. You can express your surname.

In the step of laminating n of the post-foamed polyester foam sheets, the k-th polyester foam sheet has a melting point of 180°C to 250°C or a softening point of 100°C to 150°C, and a k+1st polyester foam sheet. The melting point of is higher than 250 ℃, k may be an integer between 1 and n-1.

Specifically, the melting point (Tm) of the k-th polyester foam sheet is 180°C to 250°C; 185°C to 245°C; 190°C to 240°C; 180°C to 200°C; 200 ℃ to 230 ℃ or 195 ℃ to 230 ℃, or the softening point may be 110 ℃ to 145 ℃, 115 ℃ to 140 ℃, 120 ℃ to 135 ℃ or 125 ℃ to 130 ℃. When a polyester foam sheet having a melting point or a softening point in the above range is included among the n polyester foam sheets to be laminated, excellent adhesion can be realized.

In addition, the melting point of the k+1st polyester foam sheet may be 250°C or higher, 255 to 300°C, 260 to 295°C, 265 to 290°C, or 270 to 285°C. When a polyester foam sheet having a melting point or a softening point in the above range is included among the n polyester foam sheets to be laminated, excellent heat stability can be satisfied while achieving excellent adhesion.

Hereinafter, the present invention will be described in more detail through examples and the like according to the present invention, but the scope of the present invention is not limited by the examples given below.

Example One

In order to prepare the sandwich panel according to the present invention, a Wehas board was first manufactured.

Manufacturing of Wehas Board

In the Wehas board according to the present invention, 100 parts by weight of polyethylene terephthalate (PET) resin was dried at 180° C. to remove moisture, and the PET resin and the moisture from which the moisture was removed in the first, second, and third extruders, respectively. Based on 100 parts by weight of the removed PET resin, 1 part by weight of pyromellitic dianhydride, 1 part by weight of talc and 0.1 part by weight of Irganox (IRG 1010) were mixed and heated to 280° C. to prepare a resin melt. Then, 3 parts by weight of butane gas, respectively, based on 100 parts by weight of PET resin, was injected into the first, second, and third extruders as a blowing agent, and subsequently extruded and foamed, and controlled to a density of 100 kg/m ³ and a thickness of 2.5 mm. It was prepared. At this time, the density was measured under KS M IOS 845 conditions. The first, second, and third polyester foam sheets to be extruded and blown are continuously passed through a plurality of heaters, respectively, and heated at a temperature of 250° C. to post-foam while simultaneously adhering the surface of each polyester foam sheet to an easy state. Melted. The first, second and third polyester foam sheets with the melted surfaces were then moved to a pressure roller and laminated to prepare a laminate. The produced laminate was continuously moved to a cooling roller, cooled, and then cut by a cutter to prepare a Wehas board.

1 schematically shows a method of manufacturing a Weas board according to the first embodiment, wherein the first to third polyester foam sheets 20 are foamed from the first to third extruders 10 to continuously multi-layer heaters ( 30) The wafer board 60 is passed through a process in which the surfaces are adhered by the pressure roller 40 at the same time passing through each other, continuously cooled by the cooling roller 50, and then moved and cut by the cutting machine 60. Is manufactured. In Examples 1 and 1, the first to third polyester foam sheets were laminated, but the number of foam sheets can be adjusted as needed.

Sandwich Paneled Produce

After applying the adhesive resin on both sides of the manufactured Wehas board, a glass fiber reinforced resin plate was adhered to prepare a sandwich panel according to the present invention.

Example 2

A sandwich panel was prepared in the same manner as in Example 1, except that the density of the foam sheet was controlled to 200 kg/m ³ in the production of the Wehas board.

Comparative example One

A sandwich panel was prepared in the same manner as in Example 1, except that only surface melting was performed without post-foaming by adjusting the surface heating temperature to 50°C when the multilayer heater of the polyester foam sheet was passed instead of the foam sheet during the production of the Wehas board. .

Comparative example 2-1

A sandwich panel was prepared in the same manner as in Example 1, except that a Wehas board was manufactured using expanded polystyrene (EPS) instead of a Wehas board manufactured using PET resin.

Comparative example 2-2

A sandwich panel was prepared in the same manner as in Example 1, except that a Weas board was prepared using polyurethane (PU) instead of a Weas board made of PET resin.

Experimental Example One

In order to confirm the thermal stability characteristics of the Wehas board prepared in Example 1 and the Wehas board prepared in Comparative Example 1, the hot shrinkage ratio and the heat deformation temperature were measured.

Each measurement condition is described below, and the results are shown in Table 1 below.

(1) Hot bow ratio

The measurement of the hot shrinkage ratio is a shrinkage (%) by Equation 1 below using a difference in length measured by cutting the Wehas board specimen to a size of about 10 cm in width and 10 cm in length and applying heat for 1 hour at 100°C. Was calculated.

[Equation 1]

Shrinkage (%) = (Length after 1 hour at 1-100°C / Length before applying heat) x 100

(2) Heat deflection temperature

The heat distortion temperature was measured according to ASTM D648.

division Example One Comparative example One Hot Player Axis Ratio ( % ) 5 20 Heat deflection temperature (℃) 250 120

According to the above Table 1, in the case of the Wehas board manufactured according to the present invention, the hot shrinkage ratio was as low as 5%, and the thermal deformation temperature was very high at 250°C, and post-foaming of the polyester foam sheet was performed. By doing so, it was confirmed to have excellent thermal stability and heat resistance. On the other hand, in the case of the board according to Comparative Example 1 in which post-foaming was not performed, the hot shrinkage ratio was high at 20%, and the thermal deformation temperature was low at 120°C, confirming that the thermal stability and heat resistance were lowered. Therefore, it was confirmed that the Wehas board according to the present invention and its manufacturing method have excellent thermal stability and heat resistance by being produced with a Wehas board after performing post-foaming by applying a specific temperature to the polyester foam sheet. This indicates that the Wahas board according to the present invention can be stably utilized by minimizing shape changes even when exposed to high temperatures in various industrial fields such as building materials, automobile materials, and food containers.

Experimental Example 2

Compressive strength and water absorption of the Wehas boards prepared in Examples 1 and 2 and Comparative Examples 2-1 and 2-2 were measured, and after the adhesive resin was applied to the Wehas board, the clad steel plates were adhered to the sandwich panels prepared. For, the total amount of heat released was measured. The measurement method is described below, and the results are shown in Table 2 below.

1) Total emission heat measurement (sandwich panel)

Flame retardancy was measured under KS F 5660-1 conditions.

2) Compressive strength measurement (polyester foam sheet)

Compressive strength was measured under KS M ISO 844 conditions.

3) Absorption amount specification (polyester foam sheet)

Absorption was measured under KS M IOS 7214 conditions.

Example One Example 2 Comparative example 2-1 Comparative example 2-2 Total emission heat (MJ/m ² ) 5.8 5.5 12 15 Compressive strength (N/ cm ² ) 69 76 25 31 Absorption (g/ 100 cm ² ) 0.3 0.3 0.7 One Formula 1
(Compressive strength/density) 1.97 2.17 0.83 1.37

Looking at the total amount of heat emitted from Table 2, in Examples 1 and 2, it was found that the total amount of heat emitted was measured to be 6 MJ/m ² or less, and accordingly, the flame retardancy was indicated as Class 3 (flame retardant). However, in the case of the comparative example, it was found that flame retardancy was insufficient due to high total heat emission.

Compressive strength was 69 N/cm ^{2 in} Examples 1 and 2, respectively. And 76 N/cm ² , but Comparative Examples 2-1 and 2-2 were found to be low at 25 N/cm ² and 41 N/cm ² .

The absorption amount was as low as 0.3 g/100 cm ² in both Examples 1 and 2. However, Comparative Examples 2-1 and 2-2 showed a very high absorption amount of 0.7 g/100 cm ² or more, and in particular, in Comparative Example 2-2, the total heat emission amount was low by using PIR for flame retardancy. The amount of absorption was 1.0 g/100 cm ² As it appears high enough, a problem that external storage is not easy may occur.

Accordingly, the sandwich panel according to the present invention uses a Wehath board using polyethylene terephthalate (PET), thereby improving the flame retardancy and heat stability due to low total emission heat, and at the same time having high strength and low water absorption, making it easy to store outside. There is an advantage.

10: first to third extruders
20: first to third polyester foam sheet
30: multilayer heater
40: pressure roller
50: cooling roller
60: cutting machine
70: Wehas Board

Claims (13)

Wehas board;
A first plate material formed on one surface of the Wehas board;
A second plate member formed at a position opposite to the first plate member based on the Wehas board; And
And an adhesive dispersed between the first plate member, the second plate member, and the Weas board,
The Wehas board is n polyester foam sheet is laminated, the n is an integer of 2 or more,
The k-th polyester foam sheet of the Wehas board has a melting point of 180°C to 250°C or a softening point of 100°C to 150°C, and the melting point of the k+1st polyester foam sheet is higher than 250°C, and k is 1 To n-1 is an integer,
The hot bowel shrinkage ratio of the Wehas board is 10% or less under the condition that 1 hour has elapsed at 100°C,
The polyester foam sheet, the sandwich panel satisfies the following general formula 1:
[Formula 1]
X/Y ≥ 1.5;
In the general formula 1, X represents the compressive strength (N/cm ² ) of the resin foam layer according to KS M ISO 844, and Y represents the density (kg/m ³ ) of the resin foam layer according to KS M ISO 845.
According to claim 1,
Sandwich panels with a total volatile organic compound (VOC) content of 10 ppm or less.
According to claim 1,
Each of the first plate and the second plate is independently a sandwich panel comprising at least one of metal, synthetic resin, cement, ceramic, gypsum board, and glass fiber reinforced plastic.
According to claim 1,
The polyester foam sheet has a water absorption of 1 g/100 cm ² based on KS M IOS 7214. The following sandwich panel.
According to claim 1,
The sandwich panel having a compressive strength (KS M ISO 844) of a polyester foam sheet of 20 to 300 N/cm ² .
According to claim 1,
The polyester foam sheet is a sandwich panel whose total heat dissipation is 8 MJ/m ² or less based on KS F 5660-1.
According to claim 1,
The polyester foam sheet is a sandwich panel in which more than 90% of the cells are closed cells (DIN ISO4590).
delete According to claim 1,
The sandwich panel is formed by laminating n polyester foam sheets, and does not include a separate adhesive layer between the polyester foam sheets.
Applying an adhesive resin to the surface of the Wehas board;
Bonding the panel to the surface coated with the adhesive resin using a pressure roller; And
It includes the step of cutting the continuous product in which the Wahas board and the panel are integrated into a unit size.
The Wehas board is n polyester foam sheet is laminated, the n is an integer of 2 or more,
The k-th polyester foam sheet of the Wehas board has a melting point of 180°C to 250°C or a softening point of 100°C to 150°C, and the melting point of the k+1st polyester foam sheet is higher than 250°C, and k is 1 To n-1 is an integer,
The hot bowel shrinkage ratio of the Wehas board is 10% or less under the condition that 1 hour has elapsed at 100°C,
The polyester foam sheet, a method of manufacturing a sandwich panel that satisfies the following general formula (1):
[Formula 1]
X/Y ≥ 1.5;
In the general formula 1,
X represents the compressive strength (N/cm ² ) of the resin foam layer according to KS M ISO 844,
Y represents the density (kg/m ³ ) of the resin foam layer according to KS M ISO 845.
The method of claim 10,
Wehas Board,
Heating the polyester foam sheet to perform post-foaming; And
It characterized in that it is formed by the step of laminating n pieces of the post-foamed polyester foam sheet, wherein n is an integer of 2 or more.
The method of claim 11,
Step of performing post-foaming by heating the polyester foam sheet,
It is performed by heating one or both sides of the polyester foam sheet to an average temperature in the range of 120 to 300°C,
In the step of performing the post-foaming, the polyester foam sheet is a method of manufacturing a sandwich panel characterized in that the post-foaming occurs and the heated surface is partially melted.
The method of claim 11,
In the step of laminating n the post-foamed polyester foam sheet,
A method of manufacturing a sandwich panel, characterized in that a low melting point (LM) polyester resin layer or resin powder is placed between the polyester foam sheets.

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