KR101582712B1 - Expandable resin composition, method for preparing the same and foam using the same - Google Patents

Abstract

The foamable resin composition of the present invention comprises a thermoplastic resin containing at least one of an aromatic vinyl resin, an olefin resin and a urethane resin; And a heat insulating material comprising a first heat insulating material having an average size of 5 to 10 mu m and a second heat insulating material having an average size of 100 to 3,000 nm. The foamable resin composition can lower the thermal conductivity efficiently without increasing the content of the heat insulating material as compared with the conventional foamable resin composition.

Description

TECHNICAL FIELD [0001] The present invention relates to a foamable resin composition, a method for producing the same, and a foam using the foamable resin composition,

The present invention relates to a foamable resin composition, a process for producing the same, and a foamed molded article using the same. More specifically, the present invention relates to a foamable resin composition that can lower the thermal conductivity efficiently without increasing the content of the heat insulating material, compared with the conventional foamable resin composition, a method for producing the same, and a foamed molded article using the same.

BACKGROUND OF THE INVENTION [0002] Foamed resins, particularly polystyrene foamed resins, are excellent in molding processability, heat insulation, buffering properties, and warmth, and the foams (expanded molded articles) are widely used as packaging materials for consumer products, agricultural and marine products boxes, and house insulation materials. In recent years, there has been an increasing demand for foams having better heat insulating properties for the purpose of energy saving and the like. As a method for improving the heat insulating property, a heat insulating material (heat insulating property improving material) such as graphite, carbon black, metal oxide, A method of introducing it into a foam has been studied.

As a method for introducing the heat insulating material into the foam, styrene is polymerized in an aqueous suspension in the presence of graphite particles, which is one of the heat insulating materials, and a foaming agent is added before, during, or after the polymerization, in Korean Patent No. 10-0492199 Discloses a method of producing a foamable styrene polymer containing graphite particles (polymerization step 1). In Korean Patent No. 10-0703823, carbon particles are mixed with a styrene resin to prepare a pellet, Discloses a method of producing foamed polystyrene by extrusion (two-step method). European Patent EP 0072536 discloses a method of producing a foamed product by extrusion foaming by introducing an insulating material such as graphite or carbon black together with an olefin resin together with a foaming agent Method (extrusion single-step method) has been disclosed, and in addition, the surface of foamed polystyrene expanded particles or the fired The there is disclosed a method of coating or embedding the heat insulating material improves the polystyrene particles (coating method).

In the case of the above-mentioned one-stage polymerization, the heat resistance improver such as graphite is mixed with the resin to proceed the polymerization reaction (suspension polymerization), so that the water absorption rate is relatively high and the particle size of the foamed resin produced is uneven, It is difficult to secure stability. Particularly, as the amount of graphite used for lowering the thermal conductivity of the foamable resin is increased, it becomes more difficult to secure the suspension stability. (Extrusion + polymerization), which is a process in which a microparticle is produced by mixing a thermally insulating material with a resin, preparing a micropellet using an underwater pelletizing system, suspending the micropellet again, and injecting a foaming agent, The extrusion first stage in which a foamable material and a heat insulating property improving material are mixed together in an extrusion process without a step of suspending pellets to suspend the pellet and thereby producing a foamable resin has the following effects. It is possible to use a relatively large amount of heat insulating material. However, in order to lower the thermal conductivity, a large amount of graphite should be used. In addition, when the same amount of the heat insulating material is used, the above-mentioned coating method can exhibit a relatively excellent effect as compared with other methods. However, since the coating amount is limited and the effect of the coating is limited, It is difficult to lower the thermal conductivity.

Therefore, there is a need to develop a foamable resin composition capable of lowering the thermal conductivity of a foamed body by sufficiently exhibiting the heat insulating efficiency of a heat insulating material without increasing the amount (content) of the heat insulating substance, and a foamed molded article using the same.

An object of the present invention is to provide a foamable resin composition capable of efficiently lowering the thermal conductivity without increasing the content of a heat insulating material, a method for producing the same, and a foamed molded article using the same.

These and other objects of the present invention can be achieved by the present invention which is described in detail.

One aspect of the present invention relates to a foamable resin composition. Wherein the foamable resin composition comprises a thermoplastic resin containing at least one of an aromatic vinyl resin, an olefin resin and a urethane resin; A heat insulating material comprising a first heat insulating material having an average size of 5 to 10 占 퐉 and a second heat insulating material having an average size of 100 to 3,000 nm; And a foaming agent.

In an embodiment, the content of the heat insulating material is 0.55 to 6 parts by weight with respect to 100 parts by weight of the thermoplastic resin, and the content of the foaming agent may be 1 to 15 parts by weight with respect to 100 parts by weight of the thermoplastic resin.

In an embodiment, the thermoplastic resin may be an aromatic vinyl resin.

Preferably, the aromatic vinyl resin may be a resin obtained by polymerizing a monomer containing at least one of styrene,? -Methylstyrene, vinyltoluene, and chlorostyrene.

In an embodiment, the first adiabatic material may be graphite having an average size of 5 to 10 [mu] m.

In an embodiment, the second adiabatic material may include one or more of graphite, carbon nanotubes, halosite, and hydrolytic bentonite having an average size of 100 to 3,000 nm.

In an embodiment, the content of the first heat insulating material is 0.5 to 5 parts by weight based on 100 parts by weight of the thermoplastic resin, and the content of the second heat insulating material is 0.05 to 1 part by weight .

In an embodiment, the blowing agent is selected from the group consisting of a hydrocarbon compound containing at least one of propane, butane, isobutane, pentane, isopentane, cyclopentane and hexane, and at least one of hydrogen fluoride carbon (HCFC) and hydrogen fluoride (HFC) Or more of fluorinated hydrocarbons.

Another aspect of the present invention relates to a method for producing the foamable resin composition. In one embodiment, the method for producing the foamable resin composition comprises the steps of preparing a thermoplastic resin containing at least one of an aromatic vinyl resin, an olefin resin and a urethane resin, a first heat insulating material having an average size of 5 to 10 탆, Extruding a heat insulating material comprising a second heat insulating material having a thickness of 100 to 3,000 nm, and injecting a foaming agent.

In an embodiment, the heat insulating material may be extruded into the thermoplastic resin to prepare a pellet, and then the blowing agent may be injected into the pellet.

In an embodiment, the foaming agent may be injected when the thermoplastic resin and the heat insulating material are extruded.

In another embodiment, the method for producing the foamable resin composition includes a step of mixing a thermoplastic resin containing at least one of an aromatic vinyl resin, an olefin resin, and a urethane resin with a first heat insulating material having an average size of 5 to 10 탆, Polymerizing in the presence of an adiabatic material comprising a second adiabatic material of 100 to 3,000 nm to form a polymeric material; And injecting a foaming agent into the polymer.

In still another embodiment, the method for producing the foamable resin composition is a method in which foamable particles or foamed particles comprising an aromatic vinyl resin, an olefin resin, and a thermoplastic resin containing at least one urethane resin and a foaming agent are dispersed in an aqueous medium Coating or embedding a heat insulating material comprising a first heat insulating material having a thickness of 10 m and a second heat insulating material having an average size of 100 to 3,000 nm.

Another aspect of the invention relates to foams. In one embodiment, the foam comprises a thermoplastic resin comprising at least one of an aromatic vinyl resin, an olefin resin and a urethane resin; And a heat insulating material comprising a first heat insulating material having an average size of 5 to 10 mu m and a second heat insulating material having an average size of 100 to 3,000 nm.

In an embodiment, the first adiabatic material may be graphite having an average size of 5 to 10 [mu] m.

In an embodiment, the second adiabatic material may include one or more of graphite, carbon nanotubes, halosite, and hydrolytic bentonite having an average size of 100 to 3,000 nm.

In an embodiment, the content of the first heat insulating material is 0.5 to 5 parts by weight based on 100 parts by weight of the thermoplastic resin, and the content of the second heat insulating material is 0.05 to 1 part by weight .

In another embodiment, the foam is obtained by molding the foamable resin composition in a mold.

In embodiments, the number of days to the thermal conductivity of the foam according to KS L 9016, 20 ± 1.5 kg / m density and 300 mm of the ³ × 300 mm × 50 to mm 0.029 with the specimen based on a size 0.033 W / m * K have.

The present invention has the effect of providing a foamable resin composition capable of lowering the thermal conductivity efficiently without increasing the content of a heat insulating material, a method for producing the foamed resin composition, and an expanded molded article using the foamed resin composition.

Hereinafter, the present invention will be described in detail.

The foamable resin composition according to the present invention is a foamable resin composition comprising a thermoplastic resin containing at least one of an aromatic vinyl resin, an olefin resin and a urethane resin, a first heat insulating material having an average size of 5 to 10 mu m and a first heat insulating material having an average size of 100 to 3,000 nm And a heat insulating material containing a second heat insulating material.

(A) a thermoplastic resin

As the thermoplastic resin to be used in the present invention, a conventional thermoplastic resin used for a foamable resin composition (foamable resin particle) can be used without limitation. For example, an aromatic vinyl resin, an olefin resin, a urethane resin, Two or more of them may be used in combination. Preferably, the thermoplastic resin may be an aromatic vinyl resin, and the aromatic vinyl resin may be a resin obtained by polymerizing a monomer containing at least one of styrene, -methylstyrene, vinyltoluene, and chlorostyrene, for example, But are not limited to, polystyrene resins such as general-purpose polystyrene (GPPS) and high-impact polystyrene resin (HIPS).

The weight average molecular weight of the thermoplastic resin may be, for example, 150,000 to 400,000 g / mol, preferably 170,000 to 350,000 g / mol. It is easy to realize the performance of the foam in the above range.

(B) Insulating material

The heat insulating material used in the present invention comprises (b1) a first heat insulating material having an average size of 5 to 10 μm and (b2) a second heat insulating material having an average size of 100 to 3,000 nm.

In the present invention, the heat insulating material may have various shapes such as a spherical shape and a tubular shape. The "average size" of the first and second heat insulating materials is obtained by taking an electron microscope photograph of each heat insulating material, Means the longest length of each particle and the value obtained from the average of these.

(b1) a first heat insulating material

The first heat insulating material used in the present invention has an average size of 5 to 10 mu m, preferably 6 to 9 mu m, and for example, graphite having the above average size can be used. When the average size of the first heat insulating material is less than 5 탆, the difference between the second heat insulating material and the average size is insignificant, and synergistic effects such as low thermal conductivity may not be obtained. There is a possibility that the process becomes unstable or the coating efficiency is lowered at the time of manufacturing.

The content of the first heat insulating material may be 0.5 to 5 parts by weight, preferably 0.5 to 2 parts by weight based on 100 parts by weight of the thermoplastic resin. A foam having a low thermal conductivity in the above range can be obtained.

(b2) the second adiabatic material

The second adiabatic material used in the present invention has an average size of 100 to 3,000 nm, preferably 150 to 2,000 nm, the graphite having the average size; Carbon nanotubes; And nano clay such as hydroxycarboxylic acid halide, hydrolytic bentonite, and the like. When the average size of the second heat insulating material is less than 100 nm, it may be difficult to handle because it is too fine. When the average thermal conductivity is more than 3,000 nm, the difference in average size from the first heat insulating material is small, There is a possibility that it may not be obtained.

The content of the second heat insulating material may be 0.05 to 1 part by weight, preferably 0.1 to 0.5 part by weight based on 100 parts by weight of the thermoplastic resin. A foam having a low thermal conductivity in the above range can be obtained.

The content of the heat insulating material of the present invention is 0.55 to 6 parts by weight, preferably 0.8 to 4.7 parts by weight, based on 100 parts by weight of the thermoplastic resin. A foam having a low thermal conductivity in the above range can be obtained.

The adiabatic material has a weight ratio of the first adiabatic material and the second adiabatic material in the range of 0.5 to 50: 1, preferably 1 to 20: 1, more preferably 1 to 10: 1 A heat insulating material). In this range, it is possible to obtain a foam having a low thermal conductivity without increasing the content of the heat insulating material more efficiently.

(C) foaming agent

As the foaming agent to be used in the present invention, a foaming agent used in a conventional foamable resin composition may be used. For example, a hydrocarbon compound such as propane, butane, isobutane, pentane, isopentane, cyclopentane, hexane, ; Hydrofluorocarbons such as hydrogen fluoride carbon (HCFC) such as HCFC-142b and HCFC-123, hydrogen fluoride (HFC) such as HFC-123, and mixtures thereof; And a mixture of these may be used alone or in combination of two or more.

The content of the foaming agent is, for example, 1 to 15 parts by weight, preferably 3 to 8 parts by weight, based on 100 parts by weight of the thermoplastic resin. Excellent foam efficiency can be obtained in the above range.

The foamable resin composition according to the present invention may further contain additives such as a foaming auxiliary, a compatibilizing agent, a surfactant, a gas barrier resin, a dispersant, an antiblocking agent, a flame retardant, have. For example, the above-mentioned foaming aid facilitates foaming and molding of the foamable composite resin particles, and a conventional foaming aid can be used. For example, a foaming aid such as toluene, cyclohexane, and ethylbenzene can be used have.

When the additive is used, the content may be 0.01 to 10 parts by weight based on 100 parts by weight of the foamable resin composition, but is not limited thereto.

Another aspect of the present invention relates to a method for producing the foamable resin composition. The method for producing the foamable resin composition is not particularly limited as long as the composition and the content of the foamable resin composition can be produced, and a known production method can be used.

In one embodiment, the method for producing the foamable resin composition comprises extruding the thermoplastic resin and the heat insulating material (first and second heat insulating materials), and injecting the foam.

For example, the above-mentioned manufacturing method is a method of producing a thermoplastic resin by melt-kneading the thermoplastic resin and the heat insulating material in a pellet prepared by mixing and extruding the heat insulating material into the thermoplastic resin, for example, an extruder, For example, by pelletizing the pellets in a pressure reactor with a dispersing agent mixed with ultrapure water, suspending the pellets in a pressure reactor at a pressure of 5 to 15 kgf / cm ^{2 and} a pressure of 90 to 135 Lt; 0 > C (extrusion two-step method).

In addition, the manufacturing method may be a method (extrusion one-step method) in which the foaming agent is injected together with the thermoplastic resin and the heat insulating material at the time of extrusion and extruded by a common extrusion method.

The extruder used in the present invention is not particularly limited, but the die plate hole diameter may be 0.3 to 2.0 mm, preferably 0.5 to 1.2 mm, in order to obtain a desired grade.

In another embodiment, the method for producing the foamable resin composition includes the steps of: polymerizing the thermoplastic resin in the presence of the heat insulating material to form a polymer; And injecting a foaming agent into the polymer.

For example, the production method can be carried out by polymerizing a monomer capable of producing the thermoplastic resin in an aqueous suspension in the presence of the heat insulating material (first and second heat insulating materials) by a conventional suspension polymerization method, (Polymerization one-step method) in which a thermoplastic resin is produced and simultaneously the above blowing agent is injected and impregnated under a pressure of 5 to 15 kgf / cm ² and a temperature condition of 90 to 135 ° C.

In another embodiment, the method for producing the foamable resin composition comprises coating or embedding the heat insulating material (first and second heat insulating materials) in expandable particles or expanded particles comprising the thermoplastic resin and the foaming agent Method (coating method).

In one embodiment, the expandable granules is to inject the thermoplastic resin by the blowing agent in a conventional foamable resin production method, for example, a pressure of 5 to 15 kgf / cm ² to the thermoplastic resin and 90 to 135 ℃ Lt; RTI ID = 0.0 > of < / RTI > The expanded particles may be heated to a predetermined (volumetric) density, for example, 10 to 35 kg / cm 2 by heating at a temperature of the softening point of the expandable particles, for example, 90 to 120 캜, m < ³ >.

The heat insulating material may be applied to the surface of the expandable particles or the expanded particles in the form of a coating liquid and dried to form a coating layer or be embedded.

The coating liquid may be a conventional coating liquid of a heat insulating material used for expandable particles and expanded particles, for example, an additive such as the heat insulating material, a binder, a volatile solvent, and an antistatic agent. The coating can be performed, for example, by placing the coating liquid and the expandable particles and the expanded particles in a coating mixer so that the heat insulating material can form a coating layer uniformly distributed on the surfaces of the expandable particles or expanded particles. The embedding may be performed, for example, by first adding a solvent capable of dissolving the surface of the expandable particles or expanded particles in the coating process to dissolve the surface in an appropriate amount, adding the heat insulating particles, and adding the coating solution The heat insulating particles can be coated on the surface of the expandable particles or the expanded particles. In the coating and embedding, drying of the coating layer may be performed in the coating process, or may be performed using a separate drying process, but the present invention is not limited thereto.

The above manufacturing methods can be easily performed by a person having ordinary skill in the art to which the present invention belongs.

Another aspect of the invention relates to foams. In an embodiment, the foam may be produced by molding the foamable resin composition into a mold.

Typically the foamable resin composition to the non-foam by fusing the airtight mold filling (introduction), and, for example, the foamable resin composition by using a hot air or steam at a pressure of 0.1 to 3 kgf / cm ² in a mold Can be manufactured. For example, the foamable resin composition to be introduced into the mold may be preliminarily foamed at a predetermined (volume) density, for example, 15 to 35 kg / m ³ by heating to a softening point or higher.

The foam may be easily manufactured by a person having ordinary skill in the art to which the present invention belongs.

The foam according to the present invention was obtained by applying the above-mentioned heat-insulating substance and lowering the heat conductivity efficiently without increasing the content of the heat insulating material compared with the conventional foamable resin composition. The foam was heat-flow meter (trade name: HFM 436 , Manufactured by NETZSCH Gerate bau GmbH) having a density of 20 ± 1.5 kg / m ³ and a size of 300 mm × 300 mm × 50 mm, and 0.029 to 0.033 W / m · K on a specimen basis.

Hereinafter, the present invention will be described in more detail by way of examples, but these examples are for illustrative purposes only and should not be construed as limiting the present invention.

Example

Example  One

2 parts by weight of graphite (manufactured by TIMCAL, product name: S-249) having an average size of 6 μm as a first heat insulating material was added to 100 parts by weight of GPPS pellets (manufactured by FORMOSA CHEMICALS & FIBER CORPORATION, product name: GP- And 0.2 parts by weight of a carbon nanotube having an average size of 1,500 nm (manufactured by Nanocyl SA, product name: NANOCYL ™ NC 7000) as a second heat insulating material were mixed to prepare a mixed composition. A mini pellet with a center particle size of 1.2 mm was prepared with a twin screw extruder equipped with a pelletizing system (Underwater pelletizing system). 0.8 parts by weight of sodium pyrophosphate (Na ₄ P ₂ O ₇ .10H ₂ O) as a dispersant and 0.9 part by weight of magnesium chloride were stirred in 100 parts by weight of ultrapure water in a pressure reactor to prepare a dispersion medium, And 0.1 part by weight of calcium stearate as a blowing agent impregnation aid were added and the temperature was raised to 125 캜. 8 parts by weight of pentane mixed gas as a blowing agent was added thereto and maintained at 125 DEG C for 5 hours. After cooling to room temperature, dehydration and drying were carried out for 3 hours using a hot air drier at 40 DEG C to obtain a foamable resin composition (expandable polystyrene) .

Next, the obtained foamable resin composition was prefoamed with a steam at a pressure of 0.2 kgf / cm ² to prepare prefoamed particles, which were then fused in a mold using steam at a pressure of 0.2 to 1 kgf / cm ² to obtain a foam .

Example  2

Except that hydrofluoric bentonite (manufactured by Sigma-Aldrich Co., product name: Nanomer PGV) having an average size of 150 to 200 nm was used as a second heat insulating material in place of the carbon nanotubes To prepare a foamable resin composition and a foam.

Example  3

(Manufactured by Applied Minerals Inc., trade name: Dragonite-XR) having an average size of 3,000 nm as a second heat insulating material instead of the carbon nanotubes was used as the foaming resin composition And a foam.

Example  4

As a foamed resin particle foamed by injecting a foaming agent into a thermoplastic resin, 20 parts by weight of methyl ethyl ketone (purified gold) as a volatile solvent was added to 100 parts by weight of SF-200H (product name) of Cheil Industries Co., 2 parts by weight of vinyl acetate-vinyl chloride copolymer (Hanwha Chemical Co., CP-430) was dissolved. Then, 1 part by weight of graphite having an average size of 6 μm as a first heat insulating material (manufacturer: And 0.2 parts by weight of carbon nanotubes having an average size of 1,500 nm as a heat insulating material (manufacturer: Nanocyl SA, product name: NANOCYL ™ NC 7000) were mixed to prepare a coating solution. Next, the above-mentioned coating liquid was applied to the expandable resin particles using a Henschel mixer and then dried at 40 DEG C for 2 hours using a fluidized bed drier to remove the volatile solvent mixed in the coating liquid, (Expandable polystyrene).

Next, the obtained foamable resin composition was prefoamed with a steam at a pressure of 0.2 kgf / cm ² to prepare prefoamed particles, which were then fused in a mold using steam at a pressure of 0.2 to 1 kgf / cm ² to obtain a foam .

Comparative Example  One

Except that 2.2 parts by weight of graphite having an average size of 6 占 퐉 was used instead of 2 parts by weight of graphite having an average size of 6 占 퐉 and 0.2 parts by weight of carbon nanotubes having an average size of 1,500 nm as a heat insulating material, , A foamable resin composition and a foamed body were prepared.

Comparative Example  2

Except that 2.2 parts by weight of carbon nanotubes having an average size of 1,500 nm was used instead of 2 parts by weight of graphite having an average size of 0.5 탆 and 0.2 parts by weight of carbon nanotubes having an average size of 1,500 nm as a heat insulating material A foamable resin composition and a foamed product were prepared in the same manner as in Example 1.

Comparative Example  3

Except that 2.2 parts by weight of graphite having an average size of 6 占 퐉 was used instead of 2 parts by weight of graphite having an average size of 6 占 퐉 and 0.2 parts by weight of carbon nanotubes having an average size of 1,500 nm as a heat insulating material, , A foamable resin composition and a foamed product were prepared.

Property evaluation method

(1) Density (unit: kg / m ³ ): The foam prepared in the above Examples and Comparative Examples was cut into a size of 300 mm × 300 mm × 50 mm, dried at a temperature of 60 ° C. or higher for 48 hours or more, Were measured and divided by the volume.

(2) Thermal Conductivity (Unit: W / mK): The foam prepared in the above Examples and Comparative Examples was cut into a size of 300 mm x 300 mm x 50 mm, dried at a temperature of 60 DEG C or higher for 48 hours or more, After storing at room temperature for 24 hours, the initial thermal conductivity was measured according to KS L 9016 using a Heat Flow Meter (HFM 436, manufactured by NETZSCH Gerate bau GmbH) and the results are shown in Table 1 below.

Example Comparative Example One 2 3 4 One 2 3 Recipe Extrusion dichroic Coating method Extrusion dichroic Coating method Density (kg / m ³ ) 19.4 20.3 19.8 20.2 20.1 20.8 20.7 Thermal conductivity (W / mK) 0.0305 0.0313 0.0310 0.0325 0.0341 0.0344 0.0336

From the results shown in the above Table 1, it can be seen that the foamable resin composition and the foam (Examples 1 to 4) according to the present invention are prepared by using two kinds of heat insulating materials having different average sizes, 3, it can be seen that the thermal conductivity can be lowered efficiently without increasing the content of the heat insulating material.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (19)

A thermoplastic resin containing at least one of an aromatic vinyl resin, an olefin resin and a urethane resin;
A heat insulating material comprising a first heat insulating material having an average size of 5 to 10 占 퐉 and a second heat insulating material having an average size of 100 to 3,000 nm; And
A foaming agent,
Wherein the first adiabatic material is graphite,
Wherein the second heat insulating material comprises at least one of carbon nanotubes, halosite, and hydrolytic bentonite.
The thermoplastic resin composition according to claim 1, wherein the thermally insulating material is present in an amount of 0.55 to 6 parts by weight based on 100 parts by weight of the thermoplastic resin, and the content of the foaming agent is 1 to 15 parts by weight based on 100 parts by weight of the thermoplastic resin .
The foamable resin composition according to claim 1, wherein the thermoplastic resin is an aromatic vinyl resin.
The foamable resin composition according to claim 3, wherein the aromatic vinyl resin is a resin obtained by polymerizing a monomer containing at least one of styrene,? -Methylstyrene, vinyltoluene, and chlorostyrene.
delete delete The method according to claim 1, wherein the content of the first heat insulating material is 0.5-5 parts by weight based on 100 parts by weight of the thermoplastic resin, and the content of the second heat insulating material is 0.05-1 By weight based on the total weight of the foamable resin composition.
The method according to claim 1, wherein the foaming agent is selected from the group consisting of a hydrocarbon compound containing at least one of propane, butane, isobutane, pentane, isopentane, cyclopentane, and hexane; And fluorinated hydrocarbons including at least one of hydrogen fluoride carbon (HCFC) and hydrogen fluoride (HFC); Wherein the foamable resin composition comprises at least one of the following.
A thermoplastic resin containing at least one of an aromatic vinyl resin, an olefin resin and a urethane resin, and a second heat insulating material having an average size of 5 to 10 mu m and an average size of 100 to 3,000 nm Extruding a heat insulating material and injecting a foaming agent, characterized in that the first heat insulating material is graphite and the second heat insulating material comprises at least one of carbon nanotube, halothiose and hydrophilic bentonite By weight based on the total weight of the foamable resin composition.
The method for producing a foamable resin composition according to claim 9, wherein the heat insulating material is extruded into the thermoplastic resin to prepare a pellet, and then the foaming agent is injected into the pellet.
The method of manufacturing a foamable resin composition according to claim 9, wherein the foaming agent is injected when the thermoplastic resin and the heat insulating material are extruded.
A thermoplastic resin containing at least one of an aromatic vinyl resin, an olefin resin and a urethane resin is laminated to a heat insulating material comprising a first heat insulating material having an average size of 5 to 10 μm and a second heat insulating material having an average size of 100 to 3,000 nm Polymerizing in the presence of a substance to form a polymer; And
And injecting a foaming agent into the polymer,
Wherein the first adiabatic material is graphite,
Wherein the second heat insulating material comprises at least one of carbon nanotubes, halosite, and hydrolytic bentonite.
A foamed particle or a foamed particle comprising a thermoplastic resin containing at least one of an aromatic vinyl resin, an olefin resin and a urethane resin and a foaming agent and a first heat insulating material having an average size of 5 to 10 mu m and an average size of 100 to 3,000 lt; RTI ID = 0.0 > nm, < / RTI >
Wherein the first adiabatic material is graphite,
Wherein the second heat insulating material comprises at least one of carbon nanotubes, halosite, and hydrolytic bentonite.
A thermoplastic resin containing at least one of an aromatic vinyl resin, an olefin resin and a urethane resin; And
An insulative material comprising a first adiabatic material having an average size of between 5 and 10 μm and a second adiabatic material having an average size of between 100 and 3,000 nm,
Wherein the first adiabatic material is graphite,
Wherein the second adiabatic material comprises at least one of carbon nanotubes, haloesites, and hydrolytic bentonites.
delete delete 15. The method according to claim 14, wherein the content of the first adiabatic material is 0.5-5 parts by weight with respect to 100 parts by weight of the thermoplastic resin, and the content of the second adiabatic material is 0.05-1 By weight.
A foam obtained by molding a foamable resin composition according to any one of claims 1 to 4, 7 and 8 in a mold.
The method of claim 18, wherein the thermal conductivity of the foam according to KS L 9016, 20 ± 1.5 kg / m density and 300 mm of the ³ × 300 mm × to 50 mm 0.029 with the specimen based on a size 0.033 W / m * K ≪ / RTI >