KR20100066775A - Aerogel-polymer resin complex and method for preparing thereof - Google Patents

Abstract

PURPOSE: An aerogel-polymer resin complex is provided to obtain superior insulation performance and thermal storage property, to enable a user to easily handle the complex, and to improve miscibility with a polymer. CONSTITUTION: An aerogel-polymer resin complex(1) comprises anaerogel and a wet dispersing agent which are included in a polymer matrix. The content of the aerogel is 2-30 weight%. The aerogel(11) forms an aerogel particle within the polymer matrix(12). The average diameter of the aerogel particle is 50 nm ~ 100 micros. A method for manufacturing the aerogel-polymer resin complex comprises the following steps: preparing a suspension by uniformly mixing a monomer, wet dispersing agent, a polymerization initiator, the aerogel, a dispersing agent, and water; producing the aerogel-polymer resin complex by heating the suspension and performing polymerization; and forming an aerogel-polymer resin foam by inputting gas into the aerogel-polymer resin complex.

Description

Aerogel-polymer resin complex and method for preparing the same

1 is a schematic diagram of a network structure formed inside an airgel.

2A and 2B are schematic diagrams of a polymer coated airgel.

Figure 3 is a schematic diagram of the cross-section of the airgel-polymer resin foam according to an embodiment of the present invention.

Figure 4 is an electron micrograph of the airgel-polymer resin composite according to another embodiment of the present invention.

5 is an electron micrograph of an airgel-polymer resin composite according to another embodiment of the present invention.

6 is an electron micrograph of an airgel-polymer resin composite according to another embodiment of the present invention.

7 is an electron micrograph of an airgel-polymer resin composite prepared without using a wet dispersant.

8 is an EDAX analysis graph and an electron micrograph to which high energy (30 eV) is administered for an airgel-polymer resin composite according to another embodiment of the present invention.

Figure 9 shows a graph measuring the thermal conductivity of the airgel-polymer resin composite according to another embodiment of the present invention.

<Brief description of the major symbols in the drawings>

1: polymer coated airgel 11: airgel

12 polymer 13 polymer impregnation layer

Field of invention

The present invention relates to an airgel-polymer resin foam and a method for producing the same, and more particularly, by containing a high content of aerogel in the cell wall of the foam, so that the handleability is easy, but the heat insulating performance and compatibility with the polymer A good airgel-polymer resin foam and a method for producing the same.

Background of the Invention

In general, foamed polystyrene has high strength, light weight, buffering capacity, waterproofness, and heat retention, and is used for various home appliances, agricultural and marine products, industrial products, and other packaging materials. Occupies. However, there are many demands of consumers to keep the thickness of insulation in order to make the outer wall slimmer in order to expand the living space. In order to cope with this, improvement of thermal insulation performance is becoming more important. In order to solve this problem, US Pat. No. 6,340,713 discloses expanded polystyrene containing graphite by extruding, cooling, pulverizing and powdering graphite in polystyrene, and injecting a blowing agent to reduce thermal conductivity. In Korean Patent No. 70823, polystyrene There is also a document suggesting the possibility of improving the thermal insulation performance by preparing a pellet B prepared by mixing the carbon particles in the pellet A included in the extrusion process and injecting a blowing agent into the pellets to produce a foamed polystyrene by a two-step method. However, the improved thermal insulation performance is inadequate and the plasticizer contains a foaming agent and an antiblocking agent, so that the glass transition temperature is low, so that extrusion is difficult, and the dispersion efficiency of the additive, the cell unevenness of the foaming agent, and the particle sticking phenomenon when the foaming agent is injected decrease the foamability. Problems such as lowering of strength and lowering of thermal insulation performance occur.

Accordingly, the present inventors intend to invent a material and a method for producing the same, which exhibit excellent heat insulating performance while solving the above problems by introducing an airgel into the heat insulating material.

An object of the present invention is to provide an airgel-polymer resin foam having excellent thermal insulation performance.

Another object of the present invention is to provide an airgel-polymer resin foam which is excellent in thermal insulation performance and can be improved in compatibility with a polymer.

Still another object of the present invention is to provide a method for producing an airgel-polymer resin foam having excellent thermal insulation performance and miscibility with a polymer.

The above and other objects of the present invention can be achieved by the present invention described below.

Summary of the Invention

In one aspect of the invention, an airgel-polymer resin composite comprising an airgel and a wet dispersant embedded in a polymer matrix, wherein the content of the airgel is 2 to 30% by weight, and the airgel forms airgel particles in the polymer matrix. It is distributed to provide an airgel-polymer resin composite, characterized in that the average diameter of the airgel particles is 50nm ~ 100㎛.

Specific examples of the polymer forming the polymer matrix include polystyrene, polycarbonate, acrylobutadiene styrene copolymer (ABS), polypropylene, polyethylene, polymethyl methacrylate (PMMA), MS resin and the like.

Specific examples of the wet dispersant may be an acrylic copolymer, a modified acrylate block copolymer, a block copolymer having a pigment affinity group, or a mixture of two or more thereof.

The thermal conductivity of the airgel-polymer resin composite according to the present invention may be 0.14 to 0.08 W / mK.

In another aspect of the invention, an airgel-polymer resin foam comprising an airgel embedded in a polymer matrix and a wet dispersant, wherein the airgel content is from 2 to 30% by weight, and the airgel forms airgel particles in the polymer matrix. And aerogel particles, wherein the average particle diameter of the airgel particles is 50 nm to 100 μm, and the airgel is present on the cell wall of the airgel-polymer resin foam.

The thermal conductivity of the airgel-polymer resin foam according to the present invention may be 0.14 to 0.08 W / mK.

In another aspect of the present invention, a monomer, a wet dispersant, a polymerization initiator, an aerogel, a dispersant, and water are uniformly mixed to prepare a suspension; Heating the suspension to effect polymerization to produce an aerogel-polymer resin composite; And it provides an airgel-polystyrene composite manufacturing method comprising the step of blowing the airgel-polymer resin composite under pressure to form an airgel-polymer resin foam.

Preferably, the polymerization is carried out with a suspension droplet size of 500 to 1000 mu m.

Preferably, the polymerization is initiated at 70 to 90 ° C.

Preferably, when the polymerization conversion ratio of the suspension is 60% to 80%, pentane gas is introduced and foamed under nitrogen pressure.

Hereinafter, specific contents of the present invention will be described in detail below.

Detailed Description of the Invention

The present invention provides an airgel-polymer resin composite containing 2 to 30% by weight, preferably 2 to 10% by weight, of an aerogel in the polymer matrix, since the aerogel-polymer resin composite has a particularly high content of aerogel. The thermal insulation properties can be reflected the characteristics of the airgel excellent.

The present inventors have studied to ensure that the desired content of the airgel is contained in the polymer matrix because the compatibility between the polymer and the airgel is poor, firstly mixed the monomer and the airgel before the polymerization step and then polymerized it to the airgel-polymer The preparation of the resin composite and also the inclusion of a wet dispersant made it possible to provide an aerogel-polymer resin composite containing a high content of aerogel.

The aerogel-polymer resin composite according to the present invention obtained as described above has a high aerogel content, and the aerogel is dispersed in a polymer matrix very evenly. In the airgel-polymer resin composite according to the present invention, the airgel forms agglomerates to some extent to form agglomerates. The airgel particles are dispersed evenly in the polymer matrix, so that the average diameter of the particles becomes smaller, and the thermal insulation performance is more. Is improved. In the airgel-polymer resin composite according to the present invention, the airgel particle average diameter may be formed to about 50 nm to 100 μm.

The wet dispersant may be an acrylic copolymer, a modified acrylate block copolymer, a block copolymer having a pigment affinity group, or the like, or a mixture of two or more thereof. For example, an acrylic copolymer having an excellent effect on TiO ₂ is preferable. Also preferably, BYK-163 or BYK-2001, manufactured by BYK Corporation, is preferable. By introducing the wet dispersant in this way, since the compatibility thereof can be further increased, it is possible to prevent agglomeration of the aerogel in the polymer matrix and thus to further improve the degree of dispersion.

The airgel used in the airgel-polymer resin composite according to the present invention is not particularly limited, and those in known forms may be used, and may be organic.

More specifically, the airgel has a skeletal network structure as shown in FIG. 1, and contains 90% or more of air therein. In embodiments, those having a porosity of 80-99%, preferably 85-97% may be used, and those having a density of 0.001-0.5 g / cm ³ and preferably 0.005-0.35 g / cm ³ may be used. It is also possible to use an inner surface area of 200-2000 m ² / g, preferably 400-1800 m ² / g, and an average pore diameter of 1-100 nm, preferably 10-70 nm.

The average particle diameter of the airgel is 50 nm to 100 m, preferably 1 m to 50 m, and more preferably 10 to 45 m. If the size of the airgel is less than 50 nm, not only pores exhibiting unique characteristics of the airgel is difficult to form properly for each particle, it may be difficult to disperse. On the other hand, when it exceeds 100 ㎛ may reduce the mechanical properties of the final product.

In addition, the pore size of the airgel is 1 to 100 nm, preferably 5 to 60 nm, more preferably 10 to 50 nm. Hereinafter, the pore size of the aerogel means an average pore diameter. If the pore size of the airgel is less than 1 nm, the proportion of the skeleton occupies higher than the air may increase the density and thermal conductivity due to the skeleton, and if it exceeds 100 nm, the pore size is larger than 60 nm, the theoretical average free path of air The characteristics of the aerogels, which are increased and lower the convection of the air and exhibit an adiabatic effect, may not be exhibited.

The pore volume of the airgel is 1 to 10 cm 3 / g, preferably 1.5 to 7 cm 3 / g, more preferably 2 to 4 cm 3 / g. If the pore volume is less than 1 cm 3 / g, the space occupied by the air is too small, and at the same time, the heat conduction path to the skeleton becomes predominant, and the thermal insulation effect may be lowered. By this, the thermal insulation effect can be lowered.

In one embodiment, the airgel may have an average particle diameter of 0.05-100 μm, a pore size of 1-100 nm, and a pore volume of 1-10 cm ³ / g. In another embodiment, the airgel may have an average particle diameter of 1-100 μm, a pore size of 5-60 nm, and a pore volume of 2-10 cm ³ / g. In another embodiment, an average particle diameter of 1-50 μm, a pore size of 5-60 nm, and a pore volume of 2-4 cm ³ / g may be used.

The skeleton component of the airgel is not particularly limited. As used herein, the "skeletal of an air gel" refers to a portion of an aerogel excluding air components. For example, a metal, a metal oxide, or a combination thereof may be used as the skeleton component, and a nonmetallic material such as a polymer may be used. Among these, metal oxides are preferable. The metal oxide may be silicon dioxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), titanium oxide (TiO ₂ ), zinc oxide (ZnO), zirconium oxide (ZrO ₂ ), tin oxide (SnO ₂ ), calcium oxide (CaO), iron oxides (Fe ₂ O ₃ , Fe ₃ O ₄ ), magnesium oxide (MgO), yttrium oxide (Y ₂ O ₃ ), indium oxide (In ₂ O ₃ ), and aluminosilicates, titanosilicates, ITO, etc. As such, a metal oxide in which two or more metal components are mixed may be used, but is not necessarily limited thereto. These may be used alone or in combination of two or more thereof. Among these, silicon dioxide is preferable. In another embodiment of the present invention in the metal oxide skeleton tin (Sn), iron (Fe), zinc (Zn), magnesium (Mg), zirconium (Zr), calcium (Ca), silicon (Si), aluminum (Al ), Titanium (Ti), manganese (Mn), cobalt (Co), nickel (Ni), barium (Ba), yttrium (Y), phosphorus (P) may be further included as part of the skeleton. The above elements may be used alone or in combination of two or more thereof.

The polymer forming the polymer matrix may be, for example, polystyrene, polycarbonate, acrylobutadiene styrene copolymer (ABS), polypropylene, polyethylene (PMMA), MS resin, or the like. In particular, it is preferable to use polystyrene which is widely used for heat insulating materials.

In addition, the aerogel may be used in which all or part of the surface is coated with a thermosetting or thermoplastic polymer having affinity with the polymer matrix. Thus all or part of its surface is described in detail in Korean Patent Application No. 2008-95562 filed by the present inventors with respect to an airgel coated with a polymer, the entire contents of which are incorporated herein by reference.

Hereinafter, the airgel coated with the polymer will be described in more detail.

The polymer covering the airgel may be a thermoplastic polymer or a thermosetting polymer, and there is no particular limitation. Preferably, the polymer is selected as a polymer having affinity with the surface of the airgel and the polymer matrix forming the airgel-polymer resin composite. For example, polystyrene, high impact polystyrene (HIPS), rubber modified aromatic vinyl-vinyl cyanide graft copolymer, aromatic vinyl-vinyl cyanide copolymer, polyolefin, polyamide, poly (meth) acrylate, polyester, polyvinyl chloride, Polycarbonates, fluorinated polyolefins, polyphenylene oxides, polyphenylene sulfides, polyurethanes, unsaturated polyesters, phenolic resins, epoxy resins and the like can all be applied as polymers covering the aerogels. In one embodiment, GPPS, sPS, HIPS, ABS, ASA, SAN, MSAN, MABS, etc. may all be used. The polyester may include both polyethylene terephthalate, polybutylene terephthalate and the like. In addition, the polyolefin may include HDPE, LDPE, LLDPE, and the like, and any structure such as atactic, syndiotactic, and isotactic may be used. These polymers may be applied alone or in a mixture of two or more thereof.

In another embodiment, the weight average molecular weight of the polymer coating the airgel (hereinafter referred to as 'coating polymer') is 1,000 to 10,000,000 g / mol, preferably 10,000 to 5,000,000 g / mol, more preferably 50,000 to 3,000,000 g / mol, most preferably 100,000 to 1,000,000 g / mol. If the molecular weight of the polymer (B) is too small, the polymer can penetrate into the airgel pores to block the pores, thereby lowering the thermal insulation effect. If the molecular weight is too large, it does not dissolve well in the solvent may cause difficulties in the process. In another embodiment, the pore size and the Radius of gyration of the coating polymer are compared and coated with a polymer having an appropriate molecular weight. Preferably, Rg (radius of gyration of coating polymer)> Rp (aerogel pore size) is satisfied at 10 to 60 ° C. The Rg depends on the weight average molecular weight of the coating polymer, the solvent and the measurement temperature, and can be easily calculated by those skilled in the art. For example, when the coating polymer is dissolved in an organic solvent at 10 to 60 ° C., the Rg value calculated from the weight average molecular weight of the polymer must be greater than Rp so that the polymer does not penetrate the airgel pores and can maintain excellent thermal conductivity of the airgel. As the organic solvent, acetone, methyl ethyl ketone, n-pentane, n-hexane, n-heptane, cyclohexane, tetrahydrofuran, methylene chloride, methanol, ethanol, n-propanol, iso-propanol, DMF, DMSO And the like can be used. In another embodiment, when the coating polymer is polystyrene, Rg is obtained by Rg = 0.0285 PM0.5 (PM is based on the weight average molecular weight of the coating polymer, 35 ° C, and cyclohexane solvent), and satisfies Rg> Rp. do.

The polymer coated airgel of the present invention comprises an airgel and a coating polymer covering all or part of the airgel surface. The "coat" of the present invention may be formed by methods such as coating, encapsulation, surface adsorption, vapor deposition, and the like.

2A and 2B are schematic diagrams of a polymer coated airgel according to the present invention. As shown in FIG. 2A, the polymer-coated airgel 1 of the present invention has a structure in which the polymer 12 is coated on the surface of the airgel 11. The polymer may cover the entire surface of the airgel 11 as shown in FIG. 2A and may be partially covered, although not shown in the figure. The airgel and the polymer are physically or chemically bound. In an embodiment the airgel 11 may be coated with polymer 12 in a range of 1 to 100%, preferably 50 to 100%, more preferably 75 to 100% and most preferably 85 to 100% of the outer surface area. Can be. Here, the outer surface area means the apparent area of the particles, assuming that there are no pores of the airgel. The thickness of the coated polymer 12 is preferably 0.5 nm to 5 mu m, more preferably 0.5 to 500 nm.

The polymer-coated airgel that can be used in the present invention can control the thermal insulation effect by controlling the type and amount of coating polymer, the airgel pore size, content and type.

The polymer coated airgel may be 50 to 99.9 wt% of the airgel and 0.1 to 50 wt% of the coated polymer. Preferably it is 75 to 99 weight% of airgel and 1 to 25 weight% of coating polymer, More preferably, it is 77 to 95 weight% of aerogel and 5 to 23 weight% of coating polymer.

In another embodiment, the airgel may be organically surface-modified. That is, the surface of the airgel may be surface treated with a surface modifier before the airgel is coated with the coating polymer. Conventional coupling agents may be used as the surface treating agent, and silane, siloxane, and mixtures thereof are preferable. In another embodiment, a surface modifier having a reactive group such as a methoxy group, ethoxy group, propoxy group, isopropoxy group or halogen group may be used so that the skeleton component can react with the hydroxyl group of the airgel of silicon dioxide. The other end of the surface modifier having a reactive group as described above is C ₁ -C ₂₀ alkyl group, phenyl group, C ₁ -C ₂₀ phenylalkyl group, vinyl group, methacryl group, epoxy group, siloxane group, C ₁ -C ₂₀ amino It may have an alkyl group or a C _{1 to} C ₂₀ thiolalkyl group.

In another embodiment according to the present invention, it is possible to provide an aerogel-polymer resin composite having a thermal conductivity of 0.14 to 0.08 W / mK.

The present invention provides an airgel-polymer resin foam obtained by foaming the airgel-polymer resin composite according to the present invention, wherein the airgel content of the airgel-polymer resin foam is 2 to 30% by weight, and the airgel is Airgel particles are formed and distributed in the polymer matrix, and the average particle diameter of the airgel particles is 50 nm to 100 μm. In particular, the airgel is characterized in that it is present in the cell wall of the airgel-polymer resin foam.

3 is a schematic view of the cross-section of the airgel-polymer resin foam according to the present invention. If the aerogel and the polymer are simply physically mixed, the aerogel cannot be added, and the airgel itself has a large volume and a low density, which makes it difficult to control the process. It can cause many problems such as flying in the air. On the other hand, the airgel-polymer resin foam according to the present invention as shown in Figure 3 is to be present in the wall of the cell without the airgel in the foam cell voids, not only when manufacturing the heat insulating material but also used after completing the heat insulating material Since it is easy and can contain a high content of aerogel, heat insulation performance is improved. To this end, aerogels are introduced from the initial stage of polymer polymerization to form a foam. At this time, compatibility of inorganic aerogels and organic materials of the foams is poor, and the compatibility of the polymers is very complicated to secure polymerization stability. There is a problem that is difficult to secure. In order to secure suspension stability, wetting agents were introduced.

In one embodiment, the thermal conductivity of the airgel-polymer resin foam according to the present invention may be 0.14 to 0.08 W / mK.

The present invention also provides a method for producing an airgel-polymer resin foam, by which the airgel-polymer resin foam according to the present invention can be produced by the method for producing an airgel-polymer resin foam.

Airgel-polymer resin foam production method according to the present invention, first, to prepare a suspension by uniformly mixing a monomer, a wet dispersant, a polymerization initiator, aerogel, a dispersant and water; Heating the suspension to effect polymerization to inhibit the aerogel-polymer resin composite; The airgel-polymer resin composite is injected by blowing gas under pressure to form an airgel-polymer resin foam.

The present invention in which an aerogel having physical properties of significantly lower thermal conductivity is applied to a foamed polymer, the polymer is initially dispersed, that is, the aerogel is uniformly dispersed in the monomer so that the aerogel is not present in the suspension dispersion medium but only inside the monomer drop. This is because airgel does not exist in the pores of the cell after polymerization and it is on the wall of the cell to increase the air content of the entire foam to improve the thermal insulation performance, and because it exists inside the cell, it is easy to handle when using the foam itself after foaming. And, to induce even dispersion of the airgel powder. For this purpose, polymerization stability is required in the organic-inorganic hybrid system. In general, there may be an important problem that the liquid phase stability is significantly lowered due to a decrease in the compatibility of the organic inorganic phase when polymerization is carried out with only inorganic materials. Monomer droplet size control in the initial suspension solution can be an important factor in determining the size of the cell after foaming later.

In order to apply the organic-inorganic hybrid system to the present invention, by introducing a wet dispersant, the contact angle between the filler and the resin solution can be lowered to increase the organic-inorganic compatibility, and the suspension droplet size is preferably increased in order to achieve initial suspension stability. Is maintained at 500 to 1000 µm. For example, a homomixing machine capable of freely adjusting the suspension droplet size and producing a dispersion liquid can be used. Particularly, the particle size distribution and particle size can be controlled by controlling the time and speed of homomixing.

Preferably T.K. PRIMIX company of BATCH TYPE. HOMO MIXER HOMO MIXER is suitable. Due to the nature of the foam, it is necessary to adjust the appropriate monomer droplet size during the initial polymerization in order to control the size of the cell after foaming. Preferably, the size is 500-1000 μm, and the size is preferably 500-1000 μm after the polymerization and before foaming. If it is smaller than this size, the specific surface area of the droplets itself is increased and there is a limit to embedding the aerogel in each droplet. Therefore, the polymerization stability is weak, leading to an environment where suspension polymerization itself is impossible. On the contrary, if the drop size is larger than 1000 μm, the particles formed after the polymerization are too large to cause airgel powder to escape between the cell pores. If the drop size is more than 2500 μm, the suspension stability becomes unstable and the environment becomes impossible. have. This optimum size is also suitable for containing an airgel inside the monomer droplets, and is also desirable for maintaining a stable suspension. In order to polymerize the suspension droplets thus prepared without aggregate or coagulation, it is preferable to use a dispersing aid such as ionic TCJ, and the polymerization start temperature is about 70 to 90 ° C., preferably about 80 to 90 ° C. It is desirable to lead to solidification of the droplets.

At this time, if the airgel powder containing the air impregnated in the monomer may lose some of the airgel inherent pores, in order to prevent this more effectively, it is necessary to protect the pores of the airgel powder itself, as described above Likewise, by using the coated airgel described in Korean Patent Application No. 2008-95562, it is possible to protect the pores of the airgel itself during polymerization. In this case, since the total amount of voids is maximized as described above, the thermal insulation performance is further improved.

Preferably, when the polymerization conversion ratio of the suspension is 60 to 80%, pentane gas is introduced and foamed under nitrogen pressure. When the foaming step is performed when the polymerization conversion rate of the suspension is less than 60%, the aggregation of residual monomers and oligomers may occur, and when the gas impregnation step is performed when the polymerization conversion rate is more than 80%, gas surface impregnation may not be performed properly. Problems with foaming may occur.

Pressurization in the gas impregnation step is preferably carried out at 10 ~ 12 kgf / ㎠.

The present invention will be further illustrated by the following examples, which are merely illustrative of the present invention and are not intended to limit or limit the scope of the present invention.

Example

According to the recipe shown in Table 1 below, the initial coating or pure airgel powder was dispersed in the monomer together with the wet dispersant and the initiator to make a solution of the solid region. After mixing the dispersant and water to make a dispersion, add a solid solution to the homomixing according to rpm and time (see Table 1) to determine the droplet size of the suspension, and then subjected to polymerization by adding a temperature of 90 ℃ The polymerization conversion rate was 65% and pressurized with nitrogen after 3 hours of reaction. In this pressurized condition, pentane gas was added for 30 minutes and then pressurized for 750 minutes to terminate the reaction.

DMW: 2nd purified water

-Tricalcium phosphate (TCP), polyvinylalchol (PVA) → sigma aldrich

BPO (benzoyl peroxide) → Sigma Aldrich

-BYK-163, BYK-2001 → BYK

-Aerogel: Cabot powder with an average pore diameter of 10-20 nm and an average particle size of 8 µm (product name: TDL-201)

The coated airgel was prepared and used as follows.

As a coating polymer, 10 parts by weight of general-purpose polystyrene (product name: HF-2660S, Cheil Industries) is sufficiently dissolved in acetone (acetone: general-purpose polystyrene = 500: 1), and airgel powder (average pore diameter is 10 to 20 nm, average particle size). Size 8 μm, Cabot, product name: TDL-201), 90 parts by weight of the mixture was sufficiently mixed and left for 24 hours in an oven at 30 ° C., and then the coated airgel particles were filtered and washed to remove solvent. Powder obtained by drying at &lt; RTI ID = 0.0 &gt;

FIG. 4 is an electron micrograph of EPS (Valfostyrene) beads immediately before gas impregnation containing pure airgel powder prepared according to Example 1. FIG.

5 is an electron micrograph of EPS beads immediately before gas impregnation containing coated airgel powder prepared according to Example 2. FIG.

6 is an electron micrograph of EPS beads immediately prior to gas impregnation containing coated airgel powder prepared according to Example 3. FIG.

4 to 6 it was confirmed that the PS particles containing a stable airgel can be obtained.

7 is an electron micrograph of EPS beads immediately prior to gas impregnation containing airgel powder without the use of a wet dispersant, prepared according to Comparative Example 2. FIG. Since no wet dispersant was used, the particles did not have stability and showed a powder shape of a flake state similar to that of a bulk polymerized product.

FIG. 8 is an EDAX analysis graph and electron micrographs administered with high energy (30 eV) measured to see the dispersion of the airgel-polymer resin composite prepared according to Example 5. FIG. As can be seen in FIG. 8, even if only 3 wt% of the airgel was contained, it could be confirmed that it was spread evenly inside the PS particles.

Figure 9 shows a graph measuring the thermal conductivity of the airgel-polymer resin composite prepared according to Examples 3 to 6. In FIG. 9, the PS particles containing the airgel before the gas injection were recovered, and the thermal conductivity was measured after preparing the injection specimen by the fan cake method. As shown in the graph, the airgel contained more than 10 wt% to show an excellent effect. It is the most preferable, it was confirmed that the thermal conductivity is lowered as the concentration increases.

The phase change material-aerogel composite according to the present invention is easy to handle and has excellent thermal insulation and heat storage properties, and has improved compatibility with polymers.

Simple modifications and variations of the present invention can be readily used by those skilled in the art, and all such variations or modifications are considered to be included within the scope of the present invention.

Claims (25)

An airgel-polymer resin composite comprising an airgel embedded in a polymer matrix and a wet dispersant, wherein the airgel content is 2 to 30% by weight, the airgel forms and distributes airgel particles in the polymer matrix, and the airgel particles An average diameter of 50 nm-100 micrometers, The airgel-polymer resin composite characterized by the above-mentioned. The method of claim 1, wherein the airgel (A) is silicon dioxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), titanium oxide (TiO ₂ ), zinc oxide (ZnO), zirconium oxide (ZrO ₂ ), tin oxide (SnO ₂ ), calcium oxide (CaO), iron oxide (Fe ₂ O ₃ , Fe ₃ O ₄ ), magnesium oxide (MgO), yttrium oxide (Y ₂ O ₃ ), indium oxide (In ₂ O ₃ ), alumino A polymer-coated aerogel, characterized in that it is based on at least one metal oxide selected from the group consisting of silicates, titanosilicates and ITO. The method of claim 2, wherein the airgel skeleton is tin, iron, zinc, magnesium, zirconium, calcium, silicon (Si), aluminum (Al), titanium (Ti), manganese (Mn), cobalt (Co), nickel ( Ni), barium (Ba), yttrium (Y) and phosphorus (P) further comprises at least one element selected from the group consisting of a polymer-coated aerogel. The aerogel-polymer resin composite according to claim 1, wherein the polymer forming the polymer matrix is polystyrene, polycarbonate, acrylobutadiene styrene copolymer (ABS), polypropylene, polyethylene (PMMA) or MS. The airgel-polymer resin composite of claim 1, wherein the wet dispersant is at least one selected from the group consisting of an acrylic copolymer, a modified acrylate block copolymer, and a block copolymer having a pigment affinity group. The aerogel-polystyrene composite according to claim 1, wherein the aerogel is coated with a thermosetting or thermoplastic polymer having all or part of its surface compatible with the polymer matrix. 8. The polymer-coated airgel of claim 6, wherein the airgel coated with the thermosetting or thermoplastic polymer is Rg (radius of gyration)> Rp (airgel pore size) at 10-60 ° C. 7. The polymer-coated airgel of claim 6, wherein the airgel is organically surface modified. 7. The polymer-coated airgel of claim 6, wherein the airgel and the thermosetting or thermoplastic polymer are physically or chemically bound. The aerogel-polymer resin composite according to claim 1, wherein the thermal conductivity is 0.08 to 0.14 W / mK. An airgel-polymer resin foam comprising an airgel embedded in a polymer matrix and a wet dispersant, wherein the airgel content is 2 to 30% by weight, the airgel forms and distributes airgel particles in the polymer matrix, and the airgel particles An airgel-polymer resin foam having an average particle diameter of 50 nm to 100 μm, wherein the airgel is present on the cell wall of the airgel-polymer resin foam. The method of claim 11, wherein the airgel is silicon dioxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), titanium oxide (TiO ₂ ), zinc oxide (ZnO), zirconium oxide (ZrO ₂ ), tin oxide (SnO ₂₎ ), Calcium oxide (CaO), iron oxide (Fe ₂ O ₃ , Fe ₃ O ₄ ), magnesium oxide (MgO), yttrium oxide (Y ₂ O ₃ ), indium oxide (In ₂ O ₃ ), aluminosilicate, titano A polymer-coated aerogel, characterized in that it is based on at least one metal oxide selected from the group consisting of silicates and ITO. The method of claim 12, wherein the airgel skeleton is tin, iron, zinc, magnesium, zirconium, calcium, silicon (Si), aluminum (Al), titanium (Ti), manganese (Mn), cobalt (Co), nickel (Ni ), Barium (Ba), yttrium (Y) and phosphorus (P) further comprises at least one element selected from the group consisting of a polymer-coated aerogel. The aerogel-polymer resin foam according to claim 11, wherein the wet dispersant is at least one selected from the group consisting of an acrylic copolymer, a modified acrylate block copolymer and a block copolymer having a pigment affinity group. The aerogel-polymer resin foam according to claim 11, wherein the polymer forming the polymer matrix is polystyrene, polycarbonate, acrylobutadiene styrene copolymer (ABS), polypropylene, polyethylene (PMMA) or MS. The aerogel-polymer resin foam according to claim 11, wherein the aerogel is coated with a thermosetting or thermoplastic polymer having all or part of its surface compatible with the polymer matrix. The aerogel-polymer resin foam according to claim 16, wherein the aerogel coated with the thermosetting or thermoplastic polymer is Rg (radius of gyration of coating polymer)> Rp (air gel pore size) at 10 to 60 ° C. 18. The airgel-polymer resin foam of claim 16 wherein the airgel is organically surface modified. 17. The airgel-polymer resin foam of claim 16 wherein said airgel and said thermosetting or thermoplastic polymer are physically or chemically bonded. The aerogel-polymer resin foam according to claim 11, wherein the thermal conductivity is 0.08 to 0.14 W / mK. Preparing a suspension by uniformly mixing the monomer, the wet dispersant, the polymerization initiator, the airgel, the dispersant, and the water; Heating the suspension to effect polymerization to produce an aerogel-polymer resin composite; And The airgel-polymer resin composite is injected into a gas under pressure to foam to form an airgel-polymer resin foam comprising the step of forming aerogel-polymer resin foam. 22. The method of claim 21, wherein the polymerization is carried out with a suspension droplet size of 500 to 1000 µm during the polymerization. The method of claim 21, wherein the polymerization is initiated at 70 to 90 ° C. 23. The method for producing an aerogel-polystyrene composite according to claim 21, wherein when the polymerization conversion ratio of the suspension is 60% to 80%, pentane gas is introduced and foamed under nitrogen pressure. 22. The method of claim 21, wherein the pressurization in the gas impregnation step is carried out 10 ~ 12 kgf / ㎠.

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