KR101880904B1 - In plan laminat containing functional additive dispersed area - Google Patents

Abstract

The present invention relates to a planar laminate comprising a region in which functional additives are dispersed. The planar laminate according to the present invention is characterized in that the functional additive is dispersed at the interface between the respective resin foams to prevent deformation of the functional additive during the foaming process, It is possible to provide a planar laminate having improved physical stability and less change in physical properties even after long-term use.

Description

[0001] The present invention relates to an in-plane laminate containing functional additive dispersed in a functional additive dispersed area,

The present invention relates to a planar laminate comprising regions in which functional additives are dispersed.

Plastic foamed molded articles are widely used throughout the industry due to their advantageous properties such as lightweight, buffering, heat insulation, moldability and energy saving. Polymers such as polystyrene, polyolefin or polyvinyl chloride are amorphous, have a high melt viscosity, have little viscosity change with temperature change, and are easy to foam. They are widely used as heat insulating materials, structural materials, cushioning materials and packaging containers have. However, the above polymers are vulnerable to fire, release of environmental hormones, and low physical properties.

On the other hand, polyester is an eco-friendly material, and has excellent mechanical properties, heat resistance and chemical resistance, and is applicable to various fields requiring light weight and high physical properties.

However, the polyester has a problem in that it is melted as a crystalline resin and extruded and foamed to form it. On the other hand, with the development of the technology, it has become possible to manufacture an expanded molded article through a foaming process using polyester. For example, U.S. Patent No. 5,099,991 discloses a method of producing an expanded molded article by extrusion foaming by adding a cross-linking agent to a polyester.

However, since the melt viscosity of the polyester resin is high, it is important to control the viscosity of the molten resin when continuous extrusion foaming is performed. However, when the additives are mixed, the viscosity of the molten resin becomes more difficult to control. Specifically, when an additional functional additive is mixed in the extrusion foaming step of the polyester resin, when the viscosity of the molten resin is low, the bubbles generated by the foaming agent escape to the outside rather than collected in the resin, When the viscosity is high, there is a problem that the generated bubbles are difficult to be collected in the resin and the foaming magnification is lowered. Therefore, the expansion ratio may be lowered and the appearance of the expansion-molded article may become poor.

US Patent No. 5,000991

An object of the present invention is to provide a planar laminate having a region where a functional additive is dispersed, and to provide a planar laminate excellent in physical stability.

The present invention provides, as means for solving the above problems,

n (n is an integer of 2 or more) resin foam are layered and laminated,

it is possible to provide a planar laminate having a structure in which a functional additive is dispersed at the interface between the k-th resin foam and the (k + 1) -th resin foam (k is an integer of 1 to n-1).

The surface layered product according to the present invention is characterized in that the functional additive is separately dispersed at the interface between the respective resin foams to prevent deformation of the functional additive that may occur during the foaming process and to improve the stability of the physical properties, A laminate can be provided.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In the present invention, the terms "comprising" or "having ", and the like, specify that the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In the present invention, the term "cell" means a microstructure expanded by foaming in a polymer.

The term "foam" may refer to foaming and bead foaming by extrusion. Specifically, the foams in the present invention may mean foaming by extrusion.

Hereinafter, the present invention will be described in detail.

The present invention relates to a planar laminate including a region in which functional additives are dispersed. As one example of the planar laminate,

n (n is an integer of 2 or more) resin foam are layered and laminated,

it is possible to provide a planar laminate having a structure in which a functional additive is dispersed at the interface between the k-th resin foam and the (k + 1) -th resin foam (k is an integer of 1 to n-1).

Specifically, the face laminated body can be provided with a multilayer resin foamed body formed by laminating and bonding face-to-face, and a functional additive is dispersed at the interface between the respective resin foamed bodies to provide various functions.

For example, the face laminate may comprise two or more, two to ten, two to eight, two to seven or three to six resin foams.

Conventionally, when the resin is foamed, the functional additive is mixed and foamed. However, this makes it difficult to control the viscosity of the resin, resulting in problems such as lowered expansion ratio, poor appearance, compressive strength and bending strength.

On the other hand, the planar laminate according to the present invention can solve the above problems by forming a multi-layered resin foam using a foamed resin foam and separately dispersing a functional additive between the respective resin foams, The degree of freedom can be increased.

As an example, in the planar laminate according to the present invention, each layer of the multilayered resin foam may have the same components and physical properties. As a result, it is possible to provide a planar laminate in which specific physical properties are effectively improved.

As another example, in the planar laminate according to the present invention, the respective layers of the multilayered resin foam may have different physical properties such as thermal conductivity, compressive strength, flexural strength, and density due to their different components and physical properties , Thereby providing a planar laminate having various properties such as strength and insulation properties at the same time.

As another example, in the planar laminate according to the present invention, the functional additive dispersed among the individual resin foams may have the same components and physical properties. As a result, it is possible to provide a planar laminate in which specific physical properties are effectively improved.

As another example, in the planar laminate according to the present invention, the functional additive dispersed among the respective resin foams may have different components and physical properties. For example, each functional additive may be selected from the group consisting of an adiabatic agent, a flame retardant agent, a VOC reducing agent, a hydrophilic agent, a waterproof agent, an antibacterial agent, a deodorant, or a sunscreen agent. As a result, it is possible to provide an in-plane laminate to which various functions are imparted together with excellent heat insulating properties and strength.

The resin foam and the functional additive are each described by way of example. At this time, the examples may be performed independently, or one or more examples may be simultaneously performed. For example, each of the resin foams may have the same component or physical properties, and the functional additives formed therebetween may be the same or different. Further, while the functional properties of the respective resin foams are different from each other, the functional additives formed therebetween may be the same or different.

At least one of the resin foams constituting the face laminate may satisfy the following general formula (1).

[Formula 1]

X / Y ≥ 1.5

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

Specifically, the ratio of the density to the bending strength of the resin foam can satisfy the above-mentioned general formula (1). For example, the ratio of density to flexural strength of the resin foam may be in the range of 1.5 or more, 1.5 to 2, 1.5 to 1.8 or 1.5 to 1.7. The planar laminate according to the present invention can achieve a planar laminate having a high expansion ratio and high strength by satisfying the ratio of the density to the bending strength of the resin foam in the above range.

In the general formula 1, X may be 30 to 350 N / cm ² , and Y may be 20 to 230 kg / m ³ . For example, X (flexural strength) may be in the 40 to 300 N / cm ^2, 60 to 200 N / cm ^2, 90 to 110 N / cm ^2, 90 to 100 N / cm ² range, Y (density) May range from 25 to 200 kg / m ³ , from 30 to 150 kg / m ³ , from 40 to 75 kg / m ³ , from 50 to 75 kg / m ^3, or from 55 to 65 kg / m ³ .

The thermal conductivity of at least one of the resin foams constituting the surface laminate may be 0.04 W / m · K or less. For example, the thermal conductivity of the resin foam may range from 0.01 to 0.04 W / mK, from 0.01 to 0.035 W / mK or from 0.02 to 0.035 W / mK. The planar laminate according to the present invention includes a resin foam having a low thermal conductivity within the above range, so that excellent heat insulation can be realized.

The surface laminate according to the present invention is a multilayer foamed product obtained by forming a multi-layered resin foam layered on a plurality of resin foams by using a plurality of resin foams and separately dispersing a functional additive between the respective resin foams to prevent deterioration of properties can do.

For example, the planar laminate may satisfy the following general formula (2).

[Formula 2]

(W2 - W1) / W1 x 100? 8%

In the general formula 2,

W1 means the thermal conductivity measured under the KS L 9016 condition before the surface laminate is exposed to the outside,

W2 means the thermal conductivity measured under the KS L 9016 condition after 30 days of exposing the surface laminate to the outside.

Specifically, when the face laminate is exposed to the outside for 30 days, the rate of change of thermal conductivity before and after exposure may be 8% or less. For example, the rate of change in thermal conductivity before and after exposure may be in the range of 7% or less, 5% or 0.001 to 5%.

Specifically, the conventional foamed molded article has a problem of deteriorating physical properties when exposed to the outside for a long period of time. However, the surface laminated body according to the present invention is characterized in that the functional additive is dispersed among the resin foams, It is possible to prevent deterioration and maintain the physical properties for a long period of time.

The compression strength (KS M ISO 844) of at least one of the resin foams constituting the surface laminate may be 20 to 300 N / cm ² . Specifically, the resin foam has a compressive strength of 20 to 250 N / cm ² , 30 to 150 N / cm ² , 40 to 75 N / cm ² , 45 to 75 N / cm ² or 55 to 70 N / cm ² Lt; / RTI > For example, in the case of bead foaming, a resin foam is produced by a method in which a bead-shaped resin is put in a mold and foaming. The bead foam is subjected to a compression test in which relatively cracks, It happens easily. On the other hand, the resin foam according to one example of the present invention can be produced by an extrusion foaming method, thereby achieving remarkably excellent compression strength.

At least one of the resin foams constituting the surface laminate may be a foam of a polyester resin. The polyester resin can be produced by condensation polymerization reaction of 1,4-butanediol with terephthalic acid. The polyester resin according to the present invention includes both aromatic and aliphatic polyesters. In another aspect, the polyester resin includes a flame retardant polyester, a biodegradable polyester, an elastic polyester, and a reusable polyester. For example, the resin foam layer according to the present invention may be a PET (polyethylene terephthalate) foam.

At least one of the resin foams constituting the surface laminated body may be a closed cell (DIN ISO4590) of 90% or more. This means that the measured value of the resin foam according to DIN ISO 4590 is that at least 90% (v / v) of the cells are closed cells. For example, the percentage of closed cells in the resin foam may be on the average 90 to 100% or 95 to 99%. By controlling the closed cell to the above range, it is possible to increase the heat insulating property and the like. Through this, the laminate can be widely used in the construction industry for insulation of a part of the building, for example, foundation, wall, floor and / or roof. For example, the resin foam may comprise 1 to 30 cells, 3 to 25 cells, or 3 to 20 cells per mm ² .

In addition, the average size of the cells may be in the range of 100 to 800 mu m. For example, the average size of the cells may range from 100 to 700 mu m, 200 to 600 mu m, or 300 to 600 mu m.

At this time, the deviation of the cell size may be in a range of, for example, 5% or less, 0.1 to 5%, 0.1 to 4% to 0.1 to 3%. Thus, it can be seen that the cells of uniform size are uniformly foamed in the resin foam layer according to the present invention.

At least one of the resin foams constituting the surface laminate may be an extrusion-molded foam article.

Specifically, there are types of foaming methods largely bead foaming or extrusion foaming. In general, the bead foaming is a method of heating a resin bead to form a primary foam, aging the resin bead for a suitable time, filling the resin bead in a plate-shaped or cylindrical mold, heating the same again, and fusing and forming the product by secondary foaming.

On the other hand, the extrusion foaming can simplify the process steps by heating and melting the resin and continuously extruding and foaming the resin melt, and it is possible to mass-produce, and the cracks, Development and the like can be prevented, and more excellent bending strength and compressive strength can be realized.

The functional additive may include at least one of an insulating agent, a flame retardant, a VOC reducing agent, a hydrophilic agent, a waterproofing agent, an antibacterial agent, a deodorant, and a UV blocking agent.

Specifically, it is not particularly limited as long as it is an additive that can be dispersed between the respective resin foam interfaces and can realize the above functions.

The heat insulating material may include a carbonaceous component. For example, the adiabatic agent may include graphite, carbon black, graphene, and the like, and may be specifically graphite.

The flame retardant is not particularly limited and may include, for example, a bromine compound, a phosphorus compound, an antimony compound, a metal hydroxide, and the like. The bromine compound includes, for example, tetrabromobisphenol A and / or decabromodiphenyl ether. The phosphorus compound may include an aromatic phosphoric acid ester, an aromatic condensed phosphoric acid ester, a halogenated phosphoric acid ester, and / or the like, and the antimony compound may include antimony trioxide and antimony pentoxide. Examples of the metal element in the metal hydroxide include aluminum (Al), magnesium (Mg), calcium (Ca), nickel (Ni), cobalt (Co), tin (Sn), zinc (Zn) ), Iron (Fe), titanium (Ti), and boron (B). Among them, metal hydroxides of aluminum or magnesium can be used. The metal hydroxide may be composed of one kind of metal element or two or more kinds of metal elements. For example, the metal hydroxide may include at least one of aluminum hydroxide and magnesium hydroxide.

The VOC reducing agent may include Graf and / or Bactoster Alexin and the like. At this time, the toast alecine is a natural sterilizing material extracted from propolis.

The hydrophilic agent is not particularly limited, and examples thereof include anionic surfactants (for example, fatty acid salts, alkylsulfuric acid ester salts, alkylbenzenesulfonic acid salts, alkylnaphthalenesulfonic acid salts, alkylsulfosuccinic acid salts and polyoxyethylene alkylsulfuric acid ester salts) , 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, (E.g., alkylamine salts, quaternary ammonium salts, alkylbetaines, amine oxides, etc.), and water-soluble polymers such as polyoxyethylene alkylamines and alkylalkanolamides), cationic and amphoteric surfactants Or a protective colloid (e.g., gelatin, methyl cellulose, hydroxyethyl cellulose, Polyoxyethylene-polyoxypropylene block copolymer, polyacrylamide, polyacrylic acid, polyacrylic acid salt, sodium alginate, and polyvinyl alcohol partial saponification), and the like. can do.

The kind of the waterproofing agent is not particularly limited, and examples thereof include silicone, epoxy, cyanoacrylic acid, polyvinyl acrylate, ethylene vinyl acetate, acrylate, polychloroprene, A mixture of polyurethane and polyurethane resin, a mixture of polyol and polyurethane resin, a mixture of acrylic polymer and polyurethane resin, a polyimide, and a mixture of cyanoacrylate and urethane. .

The kind of the antibacterial agent is, for example, a composite obtained by adding at least one metal selected from the group consisting of silver, zinc, copper and iron to at least one carrier selected from the group consisting of hydroxyapatite, alumina, silica, titania, zeolite, zirconium phosphate and aluminum polyphosphate . ≪ / RTI >

The deodorant may be a porous material. Since the porous material has a strong tendency to physically adsorb a fluid flowing around the porous material, it is possible to adsorb a volatile organic compound (VOC). The deodorant may be selected from, for example, silica, zeolite and calcium (Ca), sodium (Na), aluminum (Al), silver (Ag), copper (Cu), tin (Zn), iron (Fe), cobalt ) And nickel (Ni), or a mixture of two or more thereof. The particle size of the deodorant may be from 1 to 20 micrometers, for example, from 1 to 10 micrometers or less. When the size of the deodorant particles exceeds 20 μm, pinholes are generated on the surface of the foam during the production of the foam to deteriorate the quality of the product. When the numerical range is satisfied, the adsorption of the harmful substances .

The ultraviolet screening agent is not particularly limited and may be, for example, an organic or inorganic ultraviolet screening agent. Examples of the organic ultraviolet screening agent include p-aminobenzoic acid derivatives, benzylidene camphor derivatives, cinnamic acid derivatives, Benzotriazole derivatives, and mixtures thereof. Examples of the inorganic ultraviolet screening agent may include titanium dioxide, zinc oxide, manganese oxide, zirconium dioxide, cerium dioxide, or a mixture thereof.

The functional additive may include an inorganic material and / or an organic material.

For example, the inorganic material may include at least one of graphite, carbon black, aluminum, zeolite, and silver.

In the case of an organic material, unlike the conventional method of foaming a resin and a functional additive after mixing a functional additive before foaming, in the present invention, a plurality of resin foams are produced by an extrusion foaming method, Since the functional additive is separately dispersed between the foams, there is no restriction on the boiling point of the organic material used.

Specifically, when a conventional resin and a functional additive are mixed and foamed, a functional additive having a boiling point of 250 ° C or higher should be used in order to prevent deterioration of the properties of the functional additive due to the foaming process proceeding at about 200 to 250 ° C. However, since the functional additive is dispersed in the resin foam separately from the foaming, the organic functional additive to be used at this time can be selected without restriction on the boiling point. For example, the organic material may include a phosphorus-based flame retardant.

The thickness ratio of the area where the functional additive is dispersed to the area where the functional additive is not dispersed may be 1: 100 to 10: 100.

For example, the thickness of the region in which the functional additive is not dispersed may range from 1 to 300 mm, from 5 to 300 mm, from 5 to 200 mm, or from 10 to 100 mm. Further, the thickness of the region where the functional additive is dispersed may be in the range of 0.1 to 20 mm, 0.1 to 8 mm, and 0.5 to 5 mm. Thus, it can be seen that the planar laminate according to the present invention can realize properties such as excellent bending strength, compressive strength, and heat insulation property despite the relatively thin thickness. Further, the surface laminated body can be reduced in weight, and the production cost can be reduced.

For example, the total thickness of the face laminate 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. As described above, it can be seen that characteristics such as excellent bending strength, compressive strength, and heat insulation can be realized even with a relatively thin thickness. Therefore, it is possible to reduce the weight of the planar laminate and to reduce the production cost.

The method for producing the planar laminate according to the present invention is not particularly limited,

Dispersing the functional additive on the resin foam and the resin foam; And

Thereby forming a resin foam on the upper surface of the laminate produced by alternately repeating the above steps.

For example, a method of forming a resin foam includes,

Mixing the resin melt with a foaming agent to form a foaming melt;

Forming a resin foam layer by extrusion foaming the foamable melt; And

And forming a functional coating layer on at least one side of the formed resin foam layer.

Wherein the expandable melt is formed by heating a resin to form a resin melt; And mixing the resin melt with a foaming agent to form a foamable melt.

Specifically, the step of heating the resin to form the resin melt comprises:

Drying the resin at 120 to 150 DEG C to remove moisture, and

And heating the resin in the first extruder to a temperature in the range of 250 to 290 DEG C to form a resin melt.

When the resin is heated in the first extruder, other additives such as a thickener, a nucleating agent, and a heat stabilizer may be further mixed together with the resin. At this time, the kind of the other additives is not particularly limited.

Wherein the step of foaming the foamed molten material while extruding the foamed material to form a resin foam comprises:

Cooling the melt containing the blowing agent at 220 to 260 DEG C so as to facilitate foaming through the second extruder; And

And then foaming the foamed molten material through a die. At this time, the resin foam may be maintained in a form using a calibrator.

By repeating the step of dispersing the functional additive in the resin foam thus produced and then laminating it in a face-to-face manner, it is possible to produce a planar laminate in which the functional additive dispersion region exists in various areas in the final product.

Here, the resin may be the same as that described above, and the blowing agent may include a thermally decomposing foaming agent, a volatile foaming agent, or a mixture thereof. As the pyrolytic foaming agent, for example, an inorganic foaming agent containing sodium hydrogencarbonate, an azo compound, a nitroso compound, a hydrazine compound and the like may be included. The volatile foaming agent may include, for example, an organic gas such as carbon dioxide gas or nitrogen, an organic foaming agent such as propane, butane, hexane, methane and the like. At this time, when a pyrolytic foaming agent or a volatile foaming agent is used, there is an advantage that a foamed molded article of high magnification can be obtained.

In the step of heating the resin to form a resin melt, it may further include a nucleating agent, a heat stabilizer, and / or a thickener. At this time, each type is not particularly limited.

For example, the nucleating agent may be selected from the group consisting of talc, mica, silica, diatomaceous earth, alumina, titanium oxide, zinc oxide, magnesium oxide, magnesium hydroxide, aluminum hydroxide, calcium hydroxide, potassium carbonate, calcium carbonate, , Inorganic compounds such as sodium hydrogencarbonate and glass beads, organic compounds such as polytetrafluoroethylene and azodicarbonamide, A mixture of sodium hydrogencarbonate and citric acid; And an inert gas such as nitrogen.

Further, the heat stabilizer may include a compound having a pentavalent and / or trivalent phosphorus or a hindered phenol-based compound. Specifically, the pentavalent and / or trivalent phosphorus compounds may include trimethylphosphite, phosphoric acid, phosphorous acid, and tris (2,4-di-tert-butylphenyl) phosphite, and the hindered phenol- Butyl-4-hydroxyphenyl) propionate], 1,1,3-tris (2-methyl-4-hydroxy-5 (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, N, N-hexamethylenebis Butyl-4-hydroxy-m-tolyl) propionate], and N, N-dihydroxybis (hydroxymethyl) Hexane-1,6-diylbis [3- (3,5 di-tert-butyl-4-hydroxyphenylpropionamide)].

Further, the thickener may include at least one of a compound containing an epoxy group, a compound containing an acid anhydride, a compound containing an oxazoline group, a compound containing an isocyanate group, a carbodiimide compound, and an arsenic high molecular weight PTFE have.

The step of alternately repeating the step of dispersing the functional additive on the resin foam and the resin foam may be carried out alternately 2 to 9 times.

The planar laminate according to the present invention can be provided by forming the resin foam on the upper surface of the laminate alternately repeating the above process.

At this time, the bonding between the resin foams can be carried out through fusion bonding through heating.

The surface laminate produced by such a method can be used for various purposes. For example, it can be used as an adiabatic agent.

Hereinafter, the present invention will be described in detail by way of Examples and the like according to the present invention, but the scope of the present invention is not limited thereto.

Example

100 parts by weight of the PET resin was dried at 130 DEG C to remove moisture. In the first extruder, 1 part by weight of the PET resin from which moisture was removed, 1 part by weight of PMDA (pyromellitic dianhydride), 1 part by weight of talc, ) Were mixed and heated at 280 占 폚 to prepare a resin melt. Then, carbonic acid gas was mixed as a blowing agent in the first extruder, and the resin melt was sent to the second extruder and cooled to 220 캜. The cooled resin melt was extruded and foamed while passing through a die to form a resin foam with a thickness of 10 mm.

Then, the resin foam was fixed with a calibrator to maintain a constant shape, and a graphite coating liquid was applied to the upper surface of the resin foam to a thickness of about 0.4 mm.

The step of forming the resin foam and the step of applying the graphite coating liquid to the functional additive were repeated five times. The surface of each resin foam was melted by applying heat of 270 DEG C or more to the lower surface of the resin foam, To thereby produce a planar laminate having a five-layer resin foam.

Comparative Example  One

100 parts by weight of the PET resin was dried at 130 DEG C to remove water. To the first extruder, 1 part by weight of the PET resin from which moisture was removed, 1 part by weight of PMDA, 1 part by weight of talc and 0.1 part by weight of Irganox (IRG1010) And then heated to 280 DEG C to prepare a resin melt. . Then, carbonic acid gas was mixed as a blowing agent in the first extruder, and the resin melt was sent to the second extruder and cooled to 220 캜. The cooled resin melt was extruded and foamed while passing through a die to form a resin foam with a thickness of 10 mm.

The resin foam was then fixed with a calibrator to maintain a constant shape.

Five resin foams were formed in this manner, and the surfaces were melted by applying heat of 270 DEG C or more to one surface of each of the resin foams, and the five-layer resin foam was laminated on the surface. Then, a graphite coating liquid was applied to the upper surface of the planar laminated resin laminate to a thickness of about 2 mm to prepare a planar laminate.

Comparative Example  2

The procedure of Example 1 was repeated except that the process of applying the graphite coating liquid was not carried out, and only the resin foam was bonded to produce a planar laminate.

Comparative Example  3

Except that the resin foam was prepared by mixing 0.2 part by weight of graphite based on 100 parts by weight of the resin when foaming the resin and foaming the mixture to prepare a resin foam, Only the resin foam layer prepared above was bonded to produce a planar laminate.

Experimental Example  1: Measurement of cell characteristics

Variations in cell size and cell size were measured for the planar laminate produced in Example 1 and Comparative Examples 1 to 3. Specifically, the surface laminate was SEM photographed to measure the cell size, and the deviation of the cell size within 2 mm width and 2 mm width was measured. The results are shown in Table 1 below.

Cell Size (탆) Cell size deviation (%) Example 1 300 Less than 5% Comparative Example 1 300 Less than 5% Comparative Example 2 300 Less than 5% Comparative Example 3 530 21%

Referring to Table 1, it is confirmed that the planar laminate according to the present invention has a cell size of 300 μm and a cell size variation of 5% or less, resulting in very uniform foaming.

On the contrary, in the case of Comparative Example 3 in which graphite was added during the resin foaming, it was confirmed that the cell size increased to the level of 500 to 600 탆, the cell size variation was up to 21%, and the foaming did not occur uniformly.

Experimental Example  2: Measurement of physical properties

The surface laminate prepared in Example 1 and Comparative Examples 1 to 3 was measured for physical properties such as heat insulation, rate of change in thermal conductivity and density. The measurement method is described below, and the results are shown in Table 2 below.

1) Thermal conductivity measurement (heat insulation measurement)

The thermal conductivity was measured under KS L 9016 conditions.

2) Rate of change of thermal conductivity

When the initial thermal conductivity and the thermal conductivity (long - term thermal conductivity) after exposure to the outside for 30 days were measured, the rate of change of thermal conductivity was measured and confirmed.

3) Density measurement

The density was measured under KS M ISO 845 conditions.

Initial thermal conductivity
(W / mK) Long-term thermal conductivity
(W / mK) Thermal Conductivity Change Rate
(%) Density (kg / m ³ ) Example 1 0.031 0.031 0 60 Example 2 0.031 0.031 0 60 Example 3 0.031 0.031 0 60 Comparative Example 1 0.031 0.034 9.6 60 Comparative Example 2 0.034 0.037 8.8 60 Comparative Example 3 0.032 0.35 993.8 60

Table 2 shows that the surface laminate according to the present invention has excellent heat insulating properties even after being exposed to the outside for a long period of time. On the other hand, in the case of the comparative example, there is a problem that the thermal conductivity is changed when exposed to the outside for a long period of time, and the thermal conductivity is increased up to 993.8%.

Claims (11)

n (n is an integer of 2 or more) polyethylene terephthalate resin foams are laminated in a face-
the functional additive is dispersed in the interface between the k-th polyethylene terephthalate resin foam and the (k + 1) -th polyethylene terephthalate resin foam (k is an integer of 1 to n-1)
The average size of the cells of the polyethylene terephthalate resin foam is in the range of 300 to 800 mu m, the cell size variation is within 5%
At least one of the polyethylene terephthalate resin foams is a closed cell (DIN ISO4590) in which at least 90% of the cells are closed cells,
At least one of the polyethylene terephthalate resin foams satisfies the general formula (1)
Satisfies the general formula 2,
The thermal conductivity of at least one of the polyethylene terephthalate resin foam is 0.04 W / mK or less,
The compression strength (KS M ISO 844) of at least one of the polyethylene terephthalate resin foams is 60 to 300 N / cm ² ,
At least one of the polyethylene terephthalate resin foams is an extruded foamed molded article,
The functional additive includes at least one of an adiabatic agent, a flame retardant, a VOC reducing agent, a hydrophilic agent, a waterproofing agent, an antibacterial agent, a deodorant, and a UV-
Wherein the thickness ratio of the area where the functional additive is dispersed to the area where the functional additive is not dispersed is 1: 100 to 1:30;
[Formula 1]
X / Y ≥ 1.5
X represents the flexural strength (N / cm ² ) of the polyethylene terephthalate resin foam according to KS M ISO 844 and Y represents the density (kg / m ³⁾ of the polyethylene terephthalate foam foam according to KS M ISO 845 ), Y is in the range of 55 to 65 kg / m < ³ &
[Formula 2]
(W2 - W1) / W1 x 100? 8%
In the general formula (2), W1 means the thermal conductivity measured under KS L 9016 condition before the surface laminate is exposed to the outside, W2 means the thermal conductivity measured under KS L 9016 condition after exposing the surface laminate to the outside for 30 days Means the thermal conductivity. delete delete delete delete delete delete delete delete delete delete