KR20160070615A - Porous polymer resin layer and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a porous polymer resin layer having volume thermal capacity measured by ASTM E1269 of 3,200 KJ/(m^3K) or less, and a producing method thereof. The porous polymer resin layer comprises: a binder resin including a pore having the maximum diameter of 0.3 to 1.5 mm; and an aero gel dispersed in the binder resin.

Description

TECHNICAL FIELD [0001] The present invention relates to a porous polymer resin layer,

The present invention relates to a porous polymer resin layer and a manufacturing method thereof. More particularly, the present invention relates to a method of manufacturing a porous structure capable of securing high heat resistance with low density, thermal conductivity and volumetric heat capacity, and applying heat to an internal combustion engine to reduce heat energy released to the outside, A polymer resin layer and a manufacturing method thereof.

An internal combustion engine means an engine that directly converts combustion energy generated by burning fuel directly into a piston or a turbine blade to convert the heat energy of the fuel into mechanical one.

Internal combustion engines are classified into gas engines, gasoline engines, petroleum engines, and diesel engines by the fuel used. Oil, gas and gasoline engines are ignited by electric sparks by ignition plugs (ignition), and diesel engines spontaneously ignite by injecting fuel into high temperature and high pressure air. There are four strokes and two stroke strokes depending on the stroke and operation of the piston.

Generally, it is known that the internal combustion engine of an automobile has a thermal efficiency of about 15% to 35%. Even in the maximum efficiency of the internal combustion engine, heat energy and exhaust gas emitted to the outside through the wall of the internal combustion engine, % Or more is consumed.

Since the efficiency of the internal combustion engine can be improved by reducing the amount of heat energy released to the outside through the wall of the internal combustion engine as described above, it is possible to provide a heat insulating film of a material having a low thermal conductivity on the upper surface of the inner piston of the combustion chamber of the internal combustion engine, So that the heat transfer from the combustion gas inside the combustion chamber to the piston is reduced to improve the thermal efficiency.

However, in the combustion environment of the internal combustion engine, the exhaust temperature rises to a maximum of 1600 ° C., the internal temperature of the combustion chamber reaches 600 ° C., and a high pressure is formed. Therefore, in order to apply a heat insulating film to the internal combustion engine, high heat resistance and impact resistance are required There was a limit.

In order to solve such a problem, there has been proposed a method for manufacturing a heat insulating film by mixing an airgel which is a very low density material having high heat resistance and impact resistance together with a high heat resistant binder resin having a low thermal conductivity. The aerogels have a porosity of 90% or more through the structure in which microstructures of about 10% of the thickness of hair are entangled, and the main material is silicon oxide, carbon, or organic polymer, High sound insulation and shock-absorbing performance.

However, even when the heat capacity of the high heat-resistant binder resin is not low enough to improve the thermal efficiency of the internal combustion engine and the airgel is added to lower the heat capacity of the high heat-resistant binder resin, And there was a limit in sufficiently adding an airgel.

Accordingly, it is required to develop a new airgel resin composition which has a low volumetric heat capacity and a low thermal conductivity to ensure high heat resistance.

The present invention relates to a porous polymer capable of securing high heat resistance with low density, thermal conductivity and volumetric heat capacity, and capable of improving the efficiency of an internal combustion engine and the fuel efficiency of an automobile by reducing the heat energy applied to the internal combustion engine Stratum. ≪ / RTI >

The present invention also provides a method of manufacturing the porous polymer resin layer.

In the present specification, a binder resin containing pores having a maximum diameter of 0.3 mm to 1.5 mm; And an airgel dispersed in the binder resin, wherein the volume heat capacity measured by ASTM E1269 is 3,200 KJ / (m ³ K) or less.

In this specification, furthermore, a binder resin; An airgel dispersed in the binder resin; And a thermally decomposable compound at a temperature of from 100 캜 to 300 캜. The present invention also provides a method for producing a porous polymer resin layer.

BEST MODE FOR CARRYING OUT THE INVENTION The porous polymer resin layer according to a specific embodiment of the present invention and a method for producing the porous polymer resin layer will be described in detail below.

According to one embodiment of the invention, a binder resin comprising pores having a maximum diameter of 0.3 mm to 1.5 mm; And an airgel dispersed in the binder resin, wherein the porous polymer resin layer has a volumetric heat capacity measured by ASTM E1269 of 3,200 KJ / (m ³ K) or less.

The present inventors have found that the above- When the porous polymer resin layer is used, the airgel and the pores are uniformly dispersed in the binder resin while maintaining impact resistance equal to or higher than that of the airgel originally possessed by the airgel, and the thermal conductivity and the volumetric thermal capacity And the heat resistance can be greatly improved by experiments.

The airgel is a nanoporous material and is very light, yet has excellent heat insulation performance. Since the particles or the polymer are three-dimensionally connected to each other, the airgel has an impact resistance higher than a certain level with respect to an external impact. The density of the porous polymer resin layer And it is a material meeting the purpose of improving heat resistance and impact resistance while keeping it low. In order to coat the airgel on the inner wall surface of the combustion chamber, it may be mixed with a binder resin having an adhesive force.

The porous polymer resin layer of the embodiment can provide a heat insulating material or a heat insulating structure that can be maintained for a long time in the internal combustion engine subjected to repetitive high temperature and high pressure conditions. Specifically, the porous polymer resin layer of the embodiment It can be used for coating the inner surface of the internal combustion engine or parts of the internal combustion engine.

In particular, the maximum diameter of the pores contained in the binder resin contained in the porous polymer resin layer may be 0.3 mm to 1.5 mm, or 0.35 mm to 1.45 mm, or 0.4 mm to 1.4 mm. As described above, the porous polymer resin layer may exhibit high heat resistance due to the pores contained therein, and the maximum diameter of the pores may vary depending on the type of the solvent used for generating the pores and the temperature condition .

Specifically, the maximum diameter of the pores formed under the condition of vaporization at a temperature raising rate of 3 ° C / min to 7 ° C / min using a xylene solvent may be 0.7 mm to 1.5 mm, or 0.75 mm to 1.45 mm, The maximum diameter of the pores formed under the condition of vaporizing at a temperature raising rate of 13 ° C / minute to 17 ° C / minute using a phenol solvent may be 0.3 mm to 1.3 mm, or 0.35 mm to 1.25 mm.

Particularly, the average value of the maximum diameters of the pores contained in the binder resin contained in the porous polymer resin layer may be 0.5 mm to 1.3 mm, or 0.5 mm to 1.2 mm, or 0.6 mm to 1.15 mm, or 0.7 mm to 1.13 mm have.

As the pores contained in the binder resin contained in the porous polymer resin layer represent the average value of the maximum diameter and the maximum diameter in the above-mentioned specific range, the distribution of the pore sizes is relatively uniform and can exhibit high heat resistance can confirm.

The thickness of the porous polymer resin layer may be 0.01 mm to 3 mm, or 0.05 mm to 2.5 mm, or 0.1 mm to 2 mm, or 1 mm to 1.5 mm. As described above, since the thermal conductivity and the volumetric thermal capacity of the porous polymer resin layer correspond to the physical properties of the unit volume, if the thickness is changed, the physical properties may be affected. If the thickness of the porous polymer resin layer is less than 0.1 mm, the density of the porous polymer resin layer can not be sufficiently lowered, so that the thermal conductivity is not easily lowered to a proper level or lower, and the inner corrosion prevention and surface protecting function may be deteriorated. On the other hand, if the thickness of the porous polymer resin layer exceeds 3 mm, cracks may occur in the porous polymer resin layer.

The density of the porous polymer resin layer may be 0.5 g / ml to 1.5 g / ml, or 0.5 g / ml to 1.2 g / ml, or 0.52 g / ml to 1.19 g / ml. As described above, the porous polymer resin layer may include pores together with the aerogels therein, and the gas existing inside the pores is very distant from the intermolecular distance. Therefore, as the pores are generated, the porous polymer resin layer Is reduced. In addition, the pores minimize heat transfer due to conduction or convection, and the thermal conductivity of the porous polymer resin layer can be reduced. This can be confirmed by the following equation (1).

[Equation 1]

? (T) =? (T) * Cp (T) *? (T)

In Equation (1),? (T) is the thermal conductivity,? (T) is the thermal diffusivity, Cp (T) is the specific heat and? (T) is the density.

If the density of the porous polymer resin layer is less than 0.5 g / ml, pores are excessively generated in the porous polymer resin layer, and mechanical strength such as weather resistance of the porous polymer resin layer may be lowered. If the density of the porous polymer resin layer is more than 1.5 g / ml, pores are not sufficiently generated in the porous polymer resin layer, and the thermal conductivity and volumetric thermal capacity can not be lowered to an appropriate level.

The thermal conductivity of the porous polymer resin layer measured by ASTM E1461 is 0.7 W / (mK) or less, or 0.07 W / (mK) to 0.4 W / (mK), or 0.08 W / (mK) mK). The thermal conductivity refers to the degree of the ability of a material to transmit heat by conduction. Generally, the lower the thermal conductivity, the slower the transfer of thermal kinetic energy and the better the thermal insulation. If the thermal conductivity of the porous polymer resin layer is more than 0.7 W / (mK), the transfer of thermal kinetic energy becomes too fast to increase the amount of thermal energy released to the outside of the porous polymer resin layer, Can be reduced.

The volume resistivity of the porous polymer resin layer measured by ASTM E1269 is 3,200 KJ / (m ³ K) or less, or 500 KJ / (m ³ K) to 3,000 KJ / (m ³ K) (m ³ K) to 2,900 KJ / (m ³ K), or 790 KJ / (m ³ K) to 2,850 KJ / (m ³ K). The volumetric heat capacity refers to the amount of heat required to increase a unit volume of the material by one degree, and can be specifically determined by the following equation (2).

&Quot; (2) "

Volumetric heat capacity ^{(KJ / (m 3 K)} ) = specific heat (KJ / (g · K) ) x density (g / m ³⁾

Since the specific heat is a characteristic inherent to the material, it exhibits a constant value, so the volumetric heat capacity is influenced by the density. That is, as the density of the porous polymer resin layer decreases, the volumetric thermal capacity decreases. As described above, when the density of the porous polymer resin layer is reduced, the thermal conductivity is decreased and the thermal efficiency is increased. In the case where the volume heat capacity is decreased, the same effect can be obtained.

Therefore, when the volume heat capacity of the porous polymer resin layer is more than 3,200 KJ / (m ³ K), the bulk thermal capacity can not be sufficiently lowered, the density of the porous polymer resin layer becomes large and the thermal conductivity also increases, It can be difficult.

The porous polymer resin layer may contain 0.05 wt% to 10 wt%, or 0.07 wt% to 8 wt% of the airgel, and the remaining amount of the binder resin. If the content of the aerogels is less than 0.05 wt%, it may be difficult to lower the thermal conductivity and density of the porous polymer resin layer, and it may be difficult to ensure sufficient heat insulation. If the content of the aerogels is more than 10% by weight, the aerogels become too large in the porous polymer resin layer, and a part of the surface of the airgel is exposed to the surface of the porous polymer resin layer, The adhesion characteristics to the inner wall of the internal combustion engine can be reduced.

On the other hand, the binder resin may include an acrylic resin, a urethane resin, a water-insoluble silicone resin and the like, but preferably a water-insoluble silicone resin can be used, and examples of the water-insoluble silicone resin are not limited, , Silane-modified compounds, vinyl silanes, siloxane oligomers, and the like. As described above, the binder resin itself has excellent heat resistance and can adhere to the inner wall of the internal combustion engine in a state including the airgel and the pores in the binder resin, thereby improving the heat resistance of the porous polymer resin layer You can contribute. In addition, mechanical properties such as adhesion to metal and impact resistance can be improved.

Also, the weight average molecular weight of the binder resin may be 20,000 g / mol to 300,000 g / mol, or 30,000 g / mol to 200,000 g / mol. If the weight average molecular weight of the binder resin is less than 20,000 g / mol, mechanical properties, heat resistance and heat insulation of the porous polymer resin layer may be insufficient. If the weight average molecular weight of the binder resin is more than 300,000 g / mol, the uniformity or homogeneity of the porous polymer resin layer may be deteriorated and the dispersibility of the airgel may be deteriorated.

Meanwhile, the binder resin may further include a surfactant. The surfactant is an amphipatic compound containing a hydrophilic functional group and a hydrophobic aliphatic chain in the molecule and may be included in the binder resin to improve dispersibility between the airgel and the binder resin.

The aerogels may be conventional aerogels known in the art. Specifically, aerogels composed of silicon oxide, carbon, polyimide, metal carbide, or a mixture of two or more thereof may be used. The specific surface area of the airgel may be 400 cm 2 / g to 600 cm 2 / g, or 450 cm 2 / g to 550 cm 2 / g.

On the other hand, as described above, since the porous polymer resin layer of the embodiment includes the binder resin and the airgel dispersed in the binder resin, and the binder resin includes the pores having the maximum diameter of 0.3 mm to 1.5 mm, Since the direct contact between the binder resin and the airgel can be minimized, the binder resin may not penetrate into or impregnate into the interior or pores of the airgel contained in the finally formed porous polymer resin layer.

More specifically, the binder resin may be substantially absent in the airgel dispersed in the binder resin. For example, the binder resin may be present in the airgel in an amount of 2 wt% or less, or 1 wt% or less .

On the other hand, according to another embodiment of the present invention, a binder resin; An airgel dispersed in the binder resin; And a thermally decomposable compound at a temperature of 100 ° C to 300 ° C may be provided as a method for producing the porous polymer resin layer.

The content of the binder resin and the airgel includes the above-mentioned contents with respect to the porous polymer resin layer of the embodiment.

The method for producing a porous polymer resin layer includes a step of heat-treating the polymer resin composition at a temperature of 100 ° C to 300 ° C. As the temperature of the polymer resin composition increases, the thermally decomposable compound existing in the polymer resin composition It can be vaporized. Accordingly, pores are generated in the polymer resin composition, and the porous polymer resin layer can be prepared by curing the polymer resin composition while maintaining the temperature at the end of vaporization of the pyrolyzable compound.

The polymer resin composition may include a thermally decomposable compound. The thermally decomposable compound is contained in the polymer resin composition and is vaporized by heat treatment of the polymer resin composition to form pores in the porous polymer resin layer.

Examples of the thermally decomposable compound include, but are not limited to, polyalkylene oxide compounds, tetrahydropyran compounds, polystyrene, polyacrylate compounds, xylene, alcohols, or mixtures of two or more thereof And preferably, xylene can be used.

Wherein the polyalkylene oxide-based compound is a polymer or copolymer of an alkylene oxide having 1 to 10 carbon atoms; Or a derivative thereof, and may have a number average molecular weight of 5,000 to 100,000.

The tetrahydropyran-based compound may include sucrose, cyclodextrin, glucose, derivatives thereof, or a mixture of two or more thereof.

The polystyrene includes styrene repeating units and may have a number average molecular weight of 5,000 to 100,000.

The polyacrylate compound includes an acrylate repeating unit or a methacrylate repeating unit and may have a number average molecular weight of 5,000 to 100,000.

On the other hand, the polymer resin composition comprises 10 to 70% by weight of a binder resin; 0.1% to 10% by weight of an airgel; 1% to 20% by weight of a thermally decomposable compound. In addition, the porous polymer resin composition may further comprise a surfactant.

The method may further include a step of coating the polymeric resin composition on the substrate before the step of heat-treating the polymeric resin composition at 100 ° C to 300 ° C. For example, a metal substrate, a plastic or polymer substrate, a wood substrate, a glass substrate, or the like having a predetermined thickness may be used as the substrate, Can be used. In addition, examples of the coating method are not particularly limited, but a spray coating method, for example, may be used.

The step of heat-treating the polymer resin composition at 100 ° C to 300 ° C may include vaporizing the thermally decomposable compound. In the step of vaporizing the thermally decomposable compound, the temperature of the polymeric resin composition may be elevated, and each of the thermally decomposable compounds absorbs thermal energy at the corresponding temperature, thereby vaporizing while proceeding spontaneous decomposition reaction.

As described above, the maximum diameter of the pores may vary depending on the type of the solvent used to generate the pores and the temperature raising conditions.

Specifically, the step of vaporizing the thermally decomposable compound may be performed at a temperature raising rate of 3 ° C / min to 7 ° C / min, or 4 ° C / min to 6 ° C / min. Further, the step of vaporizing the thermally decomposable compound may be performed at a temperature raising rate of 13 ° C / min to 17 ° C / min, or 14 ° C / min to 16 ° C / min.

More specifically, the maximum diameter of the pores formed under the condition of vaporization at a temperature raising rate of 3 ° C / min to 7 ° C / min may be 0.7 mm to 1.5 mm, or 0.75 mm to 1.45 mm, / Min, the maximum diameter of the pores formed may be 0.3 mm to 1.3 mm, or 0.35 mm to 1.25 mm.

If the rate of temperature rise in the step of vaporizing the thermally decomposable compound is too low, the intermolecular crosslinking structure of the binder resin contained in the polymer resin composition may not be formed well, and mechanical properties such as impact resistance and adhesiveness may be reduced, If the rate of temperature rise in the step of vaporizing the pyrolytic compound is too fast, the vaporization time of the pyrolyzable compound is shortened and the size of the pores contained in the porous polymer resin layer can be reduced.

The method may further include a step of performing heat treatment at 180 ° C to 300 ° C after the step of vaporizing the thermally decomposable compound. The porous polymer resin layer can be prepared by curing the polymer resin composition while maintaining the temperature at the end of vaporization of the thermally decomposable compound through the heat treatment at 180 ° C to 300 ° C.

The porous polymeric resin composition may lose its fluidity due to chemical changes such as chemical change or drying at a constant curing temperature to increase the strength of the porous polymeric resin layer by heat treating the polymeric resin composition at 180 ° C to 300 ° C .

If the curing temperature is less than 180 ° C, the rate of progress of curing slows down and the intermolecular cross-linking structure of the binder resin contained in the porous polymer resin composition is not formed well, and mechanical properties such as impact resistance and adhesiveness can be reduced. If the curing temperature is higher than 300 ° C, hardening occurs rapidly, and the molecular chains of the binder resin contained in the porous polymer resin composition rapidly react to form an intermolecular crosslinking structure. Therefore, the inside of the porous polymer resin layer The pore size may be reduced and the adiabatic property may be reduced.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to secure high heat resistance with low density, thermal conductivity and volumetric heat capacity, and to reduce the heat energy to be applied to the internal combustion engine and to improve the efficiency of the internal combustion engine, A polymer resin layer and a manufacturing method thereof can be provided.

The invention will be described in more detail in the following examples. However, the following examples are illustrative of the present invention, and the present invention is not limited by the following examples.

< Example 1 to 4 : Preparation of a porous polymer resin layer &gt;

(1) Production of polymer resin composition

A porous silica airgel (specific surface area of about 500 cm 2 / g), xylene and polydimethylsiloxane precursor were charged into a 20 g reactor, and zirconia beads were added (440 g) and ball milled at a rate of 200 rpm at room temperature and pressure, A composition was prepared.

(2) Formation of a porous polymer resin layer

The polymer resin composition was applied to a piston for an automobile engine by a spray coating method. Then, using a convection oven, xylene was vaporized by starting at a temperature of 100 ° C and heating at a heating rate shown in Table 1 below. After the vaporization of the xylene was completed, the porous polymer resin composition was heat-treated for 60 minutes or more at the curing temperature shown in Table 1 below to cure the porous polymer resin composition to form a porous polymer resin layer. The contents of the aerogels and the polydimethylsiloxane resin contained in the porous polymer resin layer are shown in Table 1 below.

< Comparative Example  1: Preparation of a porous polymer resin layer &gt;

As shown in the following Table 1, the porous polymer resin layer was prepared in the same manner as in Example 1, except that the content of the airgel and the polydimethylsiloxane resin were different.

< Comparative Example  2: Preparation of a porous polymer resin layer &gt;

The porous polymer resin layer was prepared in the same manner as in Example 1, except that a water-soluble silicone resin (Dow corning 804HS) was used in place of the polydimethylsiloxane resin.

The porous polymer resin layer composition and preparation conditions of the examples and comparative examples division Aerogels
(weight%)  Polydimethylsiloxane resin (% by weight) Water-soluble silicone resin (% by weight) Heating rate
(° C / minute) Curing temperature
(° C) Example 1 0.1 99.9 0 5 200 Example 2 0.1 99.9 0 15 250 Example 3 7.5 92.5 0 5 200 Example 4 7.5 92.5 0 15 250 Comparative Example 1 0 100 0 5 200 Comparative Example 2 0.1 0 99.9 5 200

< Experimental Example  : Example  And In the comparative example  Measurement of Physical Properties of the Resulting Porous Polymer Resin Layer>

The physical properties of the porous polymer resin layer obtained in the above Examples and Comparative Examples were measured by the following methods, and the results are shown in Table 1.

1. Thickness (mm)

The thickness of the porous polymer resin layer obtained in the above Examples and Comparative Examples was measured using a vernier caliper (Misuto 552-302-10) under normal temperature and normal pressure conditions.

2. Density (g / ml)

The density of the porous polymer resin layer obtained in the above Examples and Comparative Examples was measured using an electronic balance and a vernier caliper under normal temperature and pressure conditions based on the apparent density measurement standard.

3. Maximum diameter of pores (mm)

5 to 15 pores were arbitrarily selected for the porous polymer resin layer obtained in the Examples and Comparative Examples, and the maximum diameter of the pores was measured using an optical microscope.

4. Thermal conductivity (W / (mK))

The thermal conductivity of the porous polymer resin layer of the piston obtained in the above Examples and Comparative Examples was measured according to ASTM E1461 using a laser flash method at room temperature and atmospheric pressure by a thermal diffusion measurement method.

5. volumetric heat capacity ^{(kJ / (m 3 K)} )

With respect to the coating layer on the piston obtained in the above Examples and Comparative Examples, the specific heat was measured using a DSC apparatus under normal temperature conditions according to ASTM E1269, using sapphire as a reference, and the heat capacity was confirmed.

The results of the above experimental examples are shown in the following Tables 2 and 3

Measurement results of maximum pore diameters for Examples and Comparative Examples division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 One 1.388 1.121 1.398 1.233 No porosity 2 1.208 0.934 1.423 0.925 3 1.336 0.874 1.217 0.694 4 0.833 0.658 0.98 0.848 5 0.913 0.767 1.113 0.478 6 0.982 1.109 0.897 0.913 7 1.165 0.804 0.931 0.799 8 1.135 0.608 0.798 0.963 Average 1.120 0.859 1.095 0.719

As shown in Table 2, pores having an average maximum diameter of 0.859 mm to 1.120 mm were not formed in the porous polymer resin layers of Examples 1 to 4 in which the content of aerogels was 0.1 wt% to 7.5 wt% Can be confirmed.

On the other hand, in the case of Comparative Example 1 in which the content of the polydimethylsiloxane resin is 100% by weight and the porous polymer resin layer in Comparative Example 2 using the water-soluble silicone resin, it can be confirmed that no pores are formed therein.

Results of Experimental Example for Examples and Comparative Examples division thickness
(Mm) density
(g / ml) Thermal conductivity
(W / (mK)) Volumetric heat capacity
^{(KJ / (m 3 K)} ) Example 1 1.08 1.18 0.349 2814 Example 2 1.3 1.03 0.312 2480 Example 3 1.27 0.68 0.121 1080 Example 4 1.4 0.531 0.089 794 Comparative Example 1 0.8 1.36 0.721 3919 Comparative Example 2 1.3 0.88 0.147 872

As shown in Table 3, the porous polymer resin layers of Examples 1 to 4 exhibited a low density of 0.531 g / ml to 1.18 g / ml as the pores were sufficiently formed therein, The volume heat capacity is also measured to be low and it can be confirmed that it can have excellent thermal efficiency.

On the other hand, the porous polymer resin layer of Comparative Example 1 exhibited a high density of 1.36 g / ml due to no pores formed therein, and thus the thermal conductivity and volumetric heat capacity were measured to be higher than those of Examples, .

Claims (23)

A binder resin comprising pores having a maximum diameter of 0.3 mm to 1.5 mm; And
And an airgel dispersed in the binder resin,
Wherein the volume heat capacity measured by ASTM E1269 is 3,200 KJ / (m ³ K) or less.
The method according to claim 1,
And the average value of the maximum diameters of the pores is 0.5 mm to 1.3 mm.
The method according to claim 1,
A porous polymer resin layer used for coating the inner surface of an internal combustion engine or parts of an internal combustion engine.
The method according to claim 1,
A porous polymer resin layer having a thickness of 0.01 mm to 3 mm.
The method according to claim 1,
And a density of 0.5 g / ml to 1.5 g / ml.
The method according to claim 1,
A porous polymer resin layer having a thermal conductivity of 0.7 W / (mK) or less as measured by ASTM E1461.
The method according to claim 1,
A porous polymer resin layer having a volumetric heat capacity measured by ASTM E1269 of 500 KJ / (m ³ K) to 3,000 KJ / (m ³ K).
The method according to claim 1,
0.05 to 10% by weight of the airgel and the balance of the binder resin.
The method according to claim 1,
Wherein the binder resin comprises a water-insoluble silicone resin.
The method according to claim 1,
Wherein the binder resin has a weight average molecular weight of 20,000 g / mol to 300,000 g / mol.
The method of claim 1, wherein
Wherein the binder resin further comprises a surfactant.
The method according to claim 1,
Wherein the specific surface area of the airgel is 400 cm 2 / g to 600 cm 2 / g.
The method according to claim 1,
Wherein the binder resin is present in an amount of not more than 2% by weight in the inside of the airgel.
The method according to claim 1,
Wherein the maximum diameter of the pores is 0.7 mm to 1.5 mm.
The method according to claim 1,
Wherein the maximum diameter of said pores is 0.3 mm to 1.3 mm.
Binder resin; An airgel dispersed in the binder resin; And a thermally decomposable compound at a temperature of from 100 캜 to 300 캜. A method for producing a porous polymer resin layer, comprising:
17. The method of claim 16,
Wherein the thermally decomposable compound comprises at least one member selected from the group consisting of a polyalkylene oxide compound, a tetrahydropyran compound, polystyrene, a polyacrylate compound, and xylene.
17. The method of claim 16,
The polymer resin composition
Binder resin 10 wt% to 70 wt%;
0.1% to 10% by weight of an airgel;
And 1% by weight to 20% by weight of a thermally decomposable compound.
17. The method of claim 16,
Further comprising a step of coating the polymeric resin composition on a substrate prior to the step of heat-treating the polymeric resin composition at 100 ° C to 300 ° C.
17. The method of claim 16,
Wherein the step of heat-treating the polymeric resin composition at a temperature of 100 ° C to 300 ° C comprises vaporizing the thermally decomposable compound.
17. The method of claim 16,
Wherein the step of vaporizing the thermally decomposable compound is carried out by raising the temperature at a temperature raising rate of 3 ° C / min to 7 ° C / min.
17. The method of claim 16,
Wherein the step of vaporizing the thermally decomposable compound is performed by raising the temperature at a temperature raising rate of 13 ° C / min to 17 ° C / min.
17. The method of claim 16,
After the step of vaporizing the pyrolytic compound,
And then heat-treating the porous polymer resin layer at 180 ° C to 300 ° C.