JP2006207114A - External heat insulation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excellent external heat insulation structure not requiring the use of an aluminum foil sheet by using a styrene-based resin foam particle molded body with small heat transfer by radiation. <P>SOLUTION: In this external heat insulation structure, a styrene based resin foam particle molded body as a heat insulation material is installed on the outer surface of the skeleton of a building. The foam particle molded body is 10 to 100 kg/m<SP>3</SP>in apparent density, 60% or higher in closed cell fraction, and 20 to 1000 μm in averaged bubble diameter. An aluminum powder of 0.1 to 10 pts.wt with a 50% particle diameter of 0.1 to 40 μm mixed with a styrene-based resin of 100 pts.wt is contained in the foam particle molded body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an outer heat insulating structure of a building.

  An outer heat insulating structure in which a heat insulating material is attached to an outer surface of a housing such as an outer wall of a building and a construction method thereof are known (Patent Document 1).

  In addition, it is known to use a styrene resin foam having excellent heat insulation performance as a heat insulating material for housing, and as a method for producing the styrene resin foam, there are an extrusion foaming method and a bead foaming method. . Among these styrenic resin expanded particle molded bodies, those produced by the bead foaming method can be manufactured at low cost because they can be easily highly foamed.

However, when the expansion ratio of the styrene resin expanded particle molded body is increased to 30 times or more to reduce the weight, there is a problem that the thermal conductivity increases and the heat insulation performance decreases.
The reason for this is that as the expansion ratio of the styrene resin foamed particle molded body increases, the proportion of the styrene resin in the styrene resin foamed particle molded body decreases and heat transmission due to conduction heat transfer decreases. If the expansion ratio of the resin-based resin expanded particle molded body is higher than 30 times, it is considered that heat transmission due to radiant heat transfer increases and the heat insulation performance decreases.
The heat transfer of the styrene resin foamed particle molded body is composed of conduction, radiation, and convection, and heat transfer by convection occurs when the bubble diameter is large, and thus can be ignored in a normal styrene resin foam.

In order to prevent heat transmission due to radiant heat transfer when using a styrene resin foam particle molded body having a foaming ratio higher than 30 times as a heat insulating material, conventionally, an aluminum foil sheet or an aluminum vapor deposition film is provided between the wall and the heat insulating material. The radiant heat transfer was made small by sticking.
However, the above method increases the number of steps for attaching an aluminum foil sheet or the like, and the aluminum foil sheet or the like is not inexpensive. Moreover, by using an aluminum foil sheet or the like, moisture permeability may be blocked and problems such as condensation may occur. Therefore, it is not necessary to stick an aluminum foil sheet, and development of an outer heat insulating structure excellent in workability, construction cost, functionality and the like is expected.

JP-A 61-45055

  An object of this invention is to provide the outstanding external heat insulation structure which does not need to use an aluminum foil sheet | seat etc. by using the styrene-type resin expanded particle molded object with small radiation heat transfer.

According to the present invention, the following outer heat insulating structure is provided.
[1] A styrenic resin foam particle molded body is attached to the outer surface of the building casing as a heat insulating material, and the foamed particle molded body has an apparent density of 10 to 100 kg / m ³ , an independent cell ratio of 60% or more, The average cell diameter is 20 to 1000 μm, and the foamed particle molded body contains 0.1 to 10 parts by weight of aluminum powder having a 50% particle diameter of 0.1 to 40 μm with respect to 100 parts by weight of the styrene resin. An outer heat insulating structure characterized by
[2] The outer heat insulating structure according to [1], in which the proportion of the area occupied by the aluminum powder in the cut surface of the styrene-based resin expanded particle molded body is 1 to 20%.
[3] The thickness of the styrene-based resin expanded particle molded body is 20 to 180 mm, and the moisture permeability resistance is 3.0 × 10 ^{−3 to} 30.0 × 10 ⁻³ (m ² · s · Pa) / ng. The outer heat insulating structure as described in [1] or [2] above.
[4] The above [1], [2], wherein a mortar layer having a moisture permeability resistance smaller than the moisture permeability resistance of the foamed particle molded body is formed on the outer surface side of the styrene resin foamed particle molded body. Or the outer heat insulation structure as described in [3].
[5] The outer heat insulating structure according to any one of the above [1] to [4], wherein a styrene-based resin expanded particle molded body is attached to an outer surface of a building housing through an adhesive. .

Since the outer heat insulating structure of the invention according to claim 1 of the present invention uses a styrene resin foamed particle molded body containing a specific aluminum powder as a heat insulating material, heat transfer by radiation can be achieved without using an aluminum foil sheet or the like. It is suppressed and has excellent heat insulation performance, and further, moisture permeability can be secured and problems such as condensation can be solved.
The outer heat insulating structure of the invention according to claim 2 of the present invention is particularly excellent in heat insulating performance.
The outer heat insulating structure according to the third aspect of the present invention is particularly excellent in moisture permeability.
The outer heat insulating structure of the invention according to claim 4 of the present invention is particularly excellent in workability and construction cost.
The outer heat insulating structure according to the fifth aspect of the present invention is particularly excellent in dew condensation prevention performance.

In the outer heat insulating structure of the present invention, a heat insulating material is attached to the wall from the outside. Such an outer heat insulating structure is conventionally known, but the features of the present invention are the molding of styrene resin expanded particles having an apparent density of 10 to 100 kg / m ³ , an closed cell ratio of 60% or more, and an average cell diameter of 20 to 1000 μm. And 0.1 to 10 parts by weight of aluminum powder having a 50% particle diameter of 0.1 to 40 μm is contained in 100 parts by weight of the styrene resin in the styrene resin expanded resin molded body. The styrene-based resin expanded particle molded body (hereinafter also simply referred to as expanded particle molded body) is used as a heat insulating material. Since this foamed particle molded body contains specific aluminum powder, it has low radiant heat transfer despite its low apparent density (high expansion ratio).

Hereinafter, the styrene resin expanded resin molded article used in the present invention will be described in detail.
The apparent density of the foamed particle molded body used in the present invention is 10 to 100 kg / m ³ . If it is less than 10 kg / m ³ , the strength of the foamed particle molded body may decrease. When it exceeds 100 kg / m ³ , the heat insulating performance of the foamed particle molded body may be deteriorated. The apparent density of the foamed particle molded body is preferably 10 to 50 kg / m ³ , particularly preferably 10 to ³⁰ kg / m ³ .

  Moreover, the closed cell ratio of the foamed particle molded body is 60% or more. If it is less than 60%, the heat insulation performance may be lowered. Preferably it is 70% or more, More preferably, it is 80% or more.

The closed cell ratio (%) is measured by cutting a styrene resin expanded particle molded body into a test body of about 30 mm × 30 mm × 20 mm, and using an air comparison type hydrometer (air comparison type hydrometer 1000 model manufactured by Tokyo Science). The obtained specimen volume V ₁ (cm ³ ), the specimen volume V ₂ (cm ³ ) obtained by the water displacement method, the weight W (g) of the specimen, and the density d (g / cm ³ ) of the styrene resin. Is used to calculate the closed cell ratio by the following equation.
Closed cell ratio (%) = (V ₁ −W / d) / (V ₂ −W / d) × 100

  Moreover, the average cell diameter of this foamed particle molded object is 20-1000 micrometers, Preferably it is 30-500 micrometers, More preferably, it is 30-250 micrometers. When the average bubble diameter is less than 20 μm, the bubble film becomes thin, so that the bubble film may be broken by the dispersed aluminum powder, the closed cell ratio may be lowered, and the heat insulation performance may be lowered. If it exceeds 1000 μm, the strength of the foamed particle molded body may be reduced.

  The average cell diameter can be adjusted by changing the amount of the cell nucleating agent such as talc or polyethylene wax or the type and composition of the foaming agent.

  Here, the average bubble diameter is a diameter per cell (portion delimited between the walls of the resin), which is obtained by measuring 20 arbitrary points and calculating the number average value. Specifically, the foamed particle molded body was sliced with a microtome to create a thin piece having a thickness of 20 to 30 μm, and the thin piece was observed with an optical microscope, and 20 bubble diameters were measured randomly. Find on average.

  Moreover, in the styrene resin expanded resin molded article used in the present invention, 0.1 to 10 parts by weight of aluminum powder having a 50% particle diameter of 0.1 to 40 μm is dispersed with respect to 100 parts by weight of the styrene resin. Has been.

  If the content of the aluminum powder is less than 0.1 parts by weight, the effect of shielding radiant heat transfer becomes small, and the effect of reducing the thermal conductivity may not be obtained. If it exceeds 10 parts by weight, the foaming process of the styrenic resin may be adversely affected, or heat may be transferred due to contact between the aluminum powders in the styrenic resin, resulting in a decrease in heat insulation performance. In addition, Preferably it is 0.3-6 weight part, Most preferably, it is 0.5-3 weight part.

  When the aluminum powder has a 50% particle size of less than 0.1 μm, it becomes smaller than the wavelength of infrared rays, so the effect of blocking infrared rays is reduced, and the effect of lowering the thermal conductivity of the foamed particle molded body is obtained. There is a risk of not being able to. Moreover, when exceeding 40 micrometers, the effect which shields infrared rays becomes small, and there exists a possibility that the effect of the low thermal conductivity of this foamed particle molded object may not be acquired. For the same reason, the 50% particle diameter of the aluminum powder is preferably 0.5 to 20 μm.

The 50% particle size is a particle when aluminum powder is dispersed in isopropyl alcohol and the particle size distribution is measured by a laser diffraction scattering method, and the cumulative volume with respect to the volume of all particles is 50%. Is the diameter. As a measuring apparatus of the laser diffraction scattering method, “LMS-24” manufactured by Seishin Enterprise Co., Ltd. may be mentioned.
The particle shape factor is 1 (spherical).

  Moreover, it is preferable that the ratio of the area which the aluminum powder occupies in the cut surface of the foaming particle molded object used by this invention is 1 to 20%. Within this range, the proportion of aluminum powder in the cross section of the styrene resin is large, and the shielding effect of radiant heat transfer is increased, and the effect of lowering the thermal conductivity of the styrene resin foamed molded article can be obtained with a small amount of addition. It is done.

  When the ratio of the area is within the above range, a foamed particle molded article having particularly excellent heat insulation and dimensional stability can be obtained. From this viewpoint, the proportion of the area is preferably 1 to 10% or less, more preferably 2 to 8%, and further preferably 3 to 5%.

The ratio of the area occupied by the aluminum powder on the cut surface is measured as follows.
An arbitrary part of the foamed molded product (300 mm × 75 mm × 25 mm) was cut out to be a flat surface, and then sliced (thickness 0. 0 mm) with a Super Deluxe Slicer (manufactured by Watanabef Mac Co., Ltd .; WSD-2P & 3P). 4 mm to 0.6 mm) is cut out, and this cut surface is displayed with a 500 × magnification microscope (VH-7000, manufactured by Keyence Corporation).

The ratio of the area occupied by the aluminum powder on the cut surface is selected within 20 ranges of 0.2 mm × 0.2 mm in the cut surface indicated by the microscope, and is within the range of 0.2 mm × 0.2 mm. The number average of the values obtained by dividing the total area of the aluminum powder contained in the product by the area of the cut surface (= 0.04 mm ² ) according to the following formula is calculated, and the value is the ratio of the area occupied by the aluminum powder on the cut surface did.
Ratio of area occupied by aluminum powder on the cut surface (%) =
“Total area of aluminum powder (mm ² )” / 0.04 mm ² × 100

  Examples of the styrene resin constituting the foamed particle molded body used in the present invention include polystyrene, rubber-modified polystyrene, ABS resin, AS resin, and AES resin. The above styrenic resins may be used alone or in combination of two or more.

  As the type of monomer constituting the styrene resin, styrene monomer is mainly used, and monomer components copolymerizable with the styrene monomer include, for example, methyl acrylate, ethyl acrylate, propyl acrylate, acrylic acid. Alkyl ester having 1 to 10 carbon atoms of acrylic acid such as butyl and 2-ethylhexyl acrylate, etc .; methacrylic acid such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, and 2-ethylhexyl methacrylate Alkyl ester having 1 to 10 carbon atoms; α-methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, vinyltoluene, p-ethylstyrene, 2,4-dimethylstyrene, p-methoxy Styrene, p-phenylstyrene, o-chrome Styrene, m-chlorostyrene, p-chlorostyrene, 2,4-dichlorostyrene, pn-butylstyrene, pt-butylstyrene, pn-hexylstyrene, p-octylstyrene, styrenesulfonic acid, styrene Sodium sulfonate and the like; styrene monomer-derivatized monomers such as nitrile group-containing unsaturated compounds such as acrylonitrile and methacrylonitrile are used alone or in combination of two or more.

The styrene monomer and the monomer component copolymerizable with the styrene monomer are referred to as a styrene monomer.
However, when these monomers are used in addition to the styrene monomer, the weight of the styrene monomer is 50% or more based on the total weight of the styrene monomer when polymerizing the styrene resin. It is preferable.

The value of the melt flow rate (MFR) of the styrene resin constituting the foamed particle molded body used in the present invention is preferably 0.5 to 30 g / 10 minutes. In this case, it is possible to obtain an effect that the mechanical properties of the molded body molded using the obtained expanded particles are excellent.
When the melt flow rate (MFR) is less than 0.5 g / 10 minutes, the production efficiency of the expanded particles, particularly the productivity in the melt-kneading process may be lowered. When the MFR exceeds 30 g / 10 min, the mechanical properties such as compressive strength and tensile strength of the molded product molded using the foamed particles obtained as a product may be lowered. In addition, More preferably, it is 1-10 g / 10min, More preferably, it is 1-5 g / 10min.

  The melt flow rate (MFR) of the styrene resin is measured according to ISO 1133. That is, after conditioning the styrenic resin particles at 105 ° C. for 1 hour or longer, for example, using an automatic MFR measuring machine (Fully Automatic MFR Testing Machine 280, Techno Seven, die: length 8 mm × inner diameter 2.1 mm). Measured under conditions of a test temperature of 200 ° C. and a test load of 5 kg.

As the aluminum powder to be contained in the foamed particle molded body used in the present invention, one made of aluminum alone can be used, but any metal having aluminum as a main component may be used. As the metal containing aluminum as a main component, for example, an alloy (aluminum alloy) of aluminum and magnesium can be used.
As the aluminum powder, those produced by a stamp mill, a dry ball mill, a wet ball mill, an atomization or the like can be used. In grinding, a grinding aid such as stearic acid may be used. Alternatively, a paste-like aluminum powder containing a solvent such as mineral spirits may be used.
As the aluminum powder, those having a spherical shape, a granular shape, a plate shape, a scale shape, a flake shape, an indefinite shape, a needle shape and the like can be used. Preferably they are flaky and scaly.

The aluminum powder is preferably dispersed at a rate of 200 pieces / mm ² or more in the styrene-based resin expanded particle molded body, more preferably at a rate of 500 pieces / mm ² or more. preferably 600 to 5000 pieces / mm ^2, particularly preferably from 800 to 3,000 pieces / mm ^2.
When the aluminum powder is less than 200 particles / mm ² in the foamed particle molded body, the effect of reducing the thermal conductivity may not be obtained.

In addition, the density of the aluminum powder in the foamed particle molded body is measured as follows.
After cutting an arbitrary part of the foamed particle molded body (300 mm × 75 mm × 25 mm) to be a flat surface, a thin piece (thickness 0) is obtained with a super-deluxe slicer (manufactured by Watanabef-Mac Co., Ltd .; WSD-2P & 3P). .4 to 0.6 mm) is cut out and the cut surface is displayed on a 500 × magnification microscope (VH-7000, manufactured by Keyence Corporation).

Next, 20 areas of 0.2 mm × 0.2 mm in the cut surface are arbitrarily selected, the number average of the number of aluminum powders contained in the range of 0.2 mm × 0.2 mm is obtained, and the value is 1 mm. ^The value converted per ^{2 is} defined as the density of the aluminum powder in the foamed particle molded body.

The bulk density of the aluminum powder is preferably 0.33 g / cm ³ or less.
If the bulk density of the aluminum powder exceeds 0.33 g / cm ³ , the effect of reducing the thermal conductivity may not be obtained. More preferably, it is 0.30 g / cm ³ or less.
The bulk density of the aluminum powder can be measured according to, for example, JIS Z2504.

The specific surface area of the aluminum powder is preferably 0.2 m ² / cm ³ or more.
When the specific surface area of the aluminum powder is less than 0.2 m ² / cm ³ , the effect of shielding infrared rays becomes small, and the effect of reducing the thermal conductivity of the styrene resin foamed particle molded body may not be sufficiently obtained. There is. More preferably, it is 0.3 m ² / cm ³ or more.
The specific surface area of the aluminum powder can be measured by the same method as the 50% average particle diameter.

The aluminum powder preferably has a 90% particle diameter to 1% particle diameter ratio of 1 to 10, more preferably 1 to 5.
If the ratio of the 90% particle diameter to the 10% particle diameter of the aluminum powder is less than 1, the effect of reducing the thermal conductivity may not be sufficiently obtained. On the other hand, if it exceeds 10, the proportion of aluminum powder having a large particle diameter increases, which may adversely affect the foaming process of the styrene resin.

  The ratio of the 90% particle size to the 10% particle size of the aluminum powder of the present invention is the same as the 50% particle size, in which the aluminum powder is dispersed in isopropyl alcohol and the particle size distribution is determined by laser diffraction scattering method. Measure and determine the ratio of the 90% particle diameter to the 10% particle diameter, assuming that the particle diameter when the cumulative volume with respect to the volume of all particles is 10% and 90% is 10% particle diameter and 90% particle diameter, respectively. The particle shape factor is 1 (spherical).

The shape of the aluminum powder is preferably scaly.
In this case, the effect of shielding the radiation heat transfer is increased due to the large surface area, and the effect of lowering the thermal conductivity of the foamed particle molded body can be obtained by adding a small amount.
Here, the scale shape means that the aspect ratio, that is, the ratio of the major axis of the aluminum powder to the minor axis (or thickness) of the aluminum powder is, for example, 10 to 1,000. In addition, Preferably it is a 20-500 thing.
Further, the thickness of the aluminum powder is preferably smaller than the thickness of the cell membrane of the foamed particle molded body so that the foaming process of the styrene resin is not adversely affected, and the thickness of the aluminum powder is preferably 2 μm or less. Particularly preferably, it is 1 μm or less.

The foamed particle molded body used in the present invention preferably contains 0.1 to 10 parts by weight of a flame retardant with respect to 100 parts by weight of styrene resin.
If the content of the flame retardant is less than 0.1 parts by weight, there is a possibility that the flame retardant effect on the styrene-based resin expanded particle molded body cannot be obtained. If it exceeds 10 parts by weight, the styrenic resin foaming process may be adversely affected.

  Examples of the flame retardant include hexabromobenzene, tetrabromocyclooctane, hexabromocyclododecane, tetrabromobutane, hexabromocyclohexane, tribromophenol, tribromophenyl allyl ether, tetrabromobisphenol A, 2 , 2-bis (4- (2-allyloxy) -3,5-dibromophenyl) propane, ethylenebisbromide · 2,2-bis (4- (3,5-dibromo-4-hydroxyphenyl) propane condensate, 2,2-bis (4- (2,3-dibromopropoxy) -3,5-dibromophenyl) propane, decabromodiphenyl ether, octabromodiphenyl ether, per-chlorocyclopentadecane, chlorinated polyethylene, etc. Halogen flame retardant, trimethyl phosphate, triethyl phosphate Non-halogen phosphorous flame retardants such as tri-phosphate, tributyl phosphate, trioctyl phosphate, tributoxyethyl phosphate, triphenyl phosphate, tricresyl phosphate, tris (chloroethyl) ) Halogen-containing such as phosphate, tris (dichloropropyl) phosphate, tris (chloropropyl) phosphate, tris (2,3-dibromopropyl) phosphate, tris (tribromoneopentyl) phosphate Phosphorus flame retardants, aluminum hydroxide, magnesium hydroxide, calcium carbonate, calcium aluminate, antimony trioxide, expansive graphite, red phosphorus, etc. There are inorganic flame retardants etc. Two or more kinds may be mixed and used.

The thermal conductivity of the foamed particle molded body used in the present invention is preferably 0.038 W / m · K or less.
When the thermal conductivity is 0.038 W / m · K or less, the thickness of the foamed particle molded body as the heat insulating material can be reduced. More preferably, it is 0.035 W / m · K or less.

  The thermal conductivity (W / m · K) of the foamed particle molded body is determined by measuring the thermal conductivity of the foamed particle molded body according to JIS A 1412-2 heat flow meter method (HFM method). Specifically, the styrene-based resin expanded particle molded body is cut into a test body having a size of 200 × 200 × 25 mm, and is sandwiched between a heating plate and a cooling hot plate of a measuring device, and a test body temperature difference of 30 ° C. and a test body average temperature of 20 Measure under the condition of ° C.

Also, moisture permeation resistance of the foamed bead molded article is preferably from ^{3.0 × 10 -3 ~30.0 × 10 -3} (m 2 · s · Pa) / ng, 3.5 × 10 -3 ~25 0.0 × 10 ⁻³ (m ² · s · Pa) / ng is more preferable, and 4.0 × 10 ^{−3 to} 22.0 × 10 ⁻³ (m ² · s · Pa) / ng is more preferable. 0.0 × 10 ^{−3 to} 18.0 × 10 ⁻³ (m ² · s · Pa) / ng is particularly preferable. When moisture permeability resistance is within this range, moisture is released well to the outside, and it is particularly excellent in the effects of preventing internal condensation in the outer heat insulating structure, the effect of preventing frost damage, the effect of preventing insulation peeling, and the effect of stabilizing heat insulation. It becomes a thing.

Buildings such as concrete are prone to deterioration due to expansion and contraction due to moisture when wet penetrates. However, if they are covered with a material with high moisture resistance, they may cause condensation, which can lead to concrete or mortar. It tends to swell, peel off and deteriorate itself, and the heat insulating material easily peels off.
The moisture permeability resistance of the foamed particle molded body is mainly due to the control of the degree of fusion between the foamed particles when heat-molding the styrene resin foamed particles in the mold, the surface treatment of the foamed particles themselves used for in-mold molding, etc. It can be adjusted by adjusting the fusion state.
The moisture permeability coefficient per 25 mm thickness of the foamed particle molded body is preferably 150 to 290 ng / (m ² · s · Pa).

The moisture permeability resistance of the foamed particle molded body is measured by the cup method of JIS A 1324-1995. However, in JIS A 1324-1995, the maximum thickness of the sample is 50 mm. However, in the measurement of moisture permeation resistance in the present invention, it is not limited thereto, and the sample size is 300 × 300 mm, and the thickness is foamed. Let it be the total thickness of the particle compact.
The moisture permeability coefficient per 25 mm thickness of the foamed particle compact is a value obtained by multiplying the reciprocal of the moisture permeation resistance measured by the above method by (total thickness (mm) / 25 of foamed particle compact). It is.

  The thickness of the foamed particle molded body is preferably 20 to 180 mm, more preferably 20 to 150 mm, still more preferably 25 to 100 mm, and particularly preferably 40 to 100 mm. When the thickness is too thin, the heat insulating property of the foamed particle molded body becomes insufficient, and the mechanical strength also becomes weak. On the other hand, if the thickness is too thick, the outer heat insulating structure may be too thick.

The foamed particle molded body used in the present invention preferably has a weight average molecular weight (Mw) value of 160,000 to 400,000 as measured by the GPC method.
If the weight average molecular weight is less than 160,000, the strength of the foamed molded product may be reduced, or the dimensional stability may be deteriorated. On the other hand, when the weight average molecular weight exceeds 400,000, the foaming property is lowered, and it becomes difficult to foam to a target foaming ratio (for example, 50 to 60 times), or the styrene resin particles melt during molding. There is a risk that it will be difficult to wear and the strength of the molded product will decrease. More preferably, it is 180,000-380,000, More preferably, it is 200,000-350,000.

The weight average molecular weight (Mw) is a value measured by GPC method. Specifically, a styrene resin expanded resin molded article is dissolved in THF, insolubles are removed with a membrane filter, and then measured by gel permeation chromatography (GPC).
Further, the foamed particle molded body used in the present invention is added to a flame retardant such as hexabromocyclododecane, tetrabromobisphenol A, trimethyl phosphate, aluminum hydroxide, antimony trioxide, 2,3-dimethyl- A flame retardant aid such as 2,3-diphenylbutane, a methyl methacrylate copolymer, polyethylene wax, talc, silica, ethylene bisstearylamide, silicone and the like can also be added.

  Foamed particle molded bodies used in the present invention include liquid paraffin, glycerin diacetomonolaurate, glycerin tristearate, di-2-ethylhexyl phthalate, di-2-ethylhexyl adipate, and the like, alkyl Anti-oxidants such as diethylamine, glycerin fatty acid ester, sodium alkyl sulfonate, antioxidants such as phenol, phosphorus and sulfur, UV absorbers such as benzotriazole and benzophenone, hinders Light stabilizers such as door amines, conductive carbon black, graphite powder, copper zinc alloy powder, conductive fillers such as copper powder, silver powder, gold powder, organic antibacterial agents such as IPBC, TBZ, BCM, TPN, Additives such as inorganic antibacterial agents such as silver, copper, zinc, and titanium oxide can also be added. Further, rubber components such as butadiene rubber, styrene-butadiene rubber, isoprene rubber, and ethylene-propylene rubber may be added.

It is preferable to produce the styrene resin expanded resin molded article used in the present invention by the following method.
That is, the styrene resin, the aluminum powder, and the dispersing agent are mixed with an extruder, and then the mixture is extruded, cooled, granulated, and the obtained aluminum powder-containing styrene resin particles are suspended in water. In the method for producing a styrene resin foamed particle molded body obtained by supplying a foaming agent to obtain expandable styrene resin particles impregnated with the foaming agent, and then foaming by heating, a hydrocarbon having 3 to 6 carbon atoms, And it is preferable to manufacture by the method of using the foaming agent whose ratio which a C4-C4 hydrocarbon accounts in a foaming agent is 5 to 80 weight%.

According to this method, since the specific foaming agent is used, it is possible to produce a styrene resin foamed particle molded body having excellent heat insulation performance and excellent dimensional stability. In particular, the obtained expanded foam molded body has a long usable life and a high expansion ratio.
The above hydrocarbon having 2 or less carbon atoms has a high ability to disperse the foaming agent from the styrene-based resin particles, so that the usable life may be very short. When the number of carbon atoms is 7 or more, the foaming power is reduced, and it may be difficult to foam to the target foaming ratio. More preferably, it is a C4-C5 hydrocarbon.

Examples of the hydrocarbon having 3 to 6 carbon atoms include aliphatic hydrocarbons such as propane, normal butane, isopentane, normal pentane, isopentane, neopentane, and hexane, and alicyclic hydrocarbons such as cyclobutane and cyclopentane. Can be mentioned.
In the case where the proportion of the C 4 hydrocarbon in the foaming agent in the foaming styrene resin particles is 5 to 80% by weight, the foaming of the foamable styrene resin particles or secondary foaming during molding While improving force, the shrinkage | contraction at the time of foam molding can be suppressed, and the dimensional stability of a foamed particle molded object can be improved.

  The reason for this is not clear, but is estimated as follows. In other words, aluminum powder has a large bulk density and a great effect of shielding infrared rays. However, because the shape is sharp, the dispersed aluminum powder breaks the cell membrane during foaming and molding, and the closed cell rate decreases. Insulation performance is likely to deteriorate. However, when the carbon number 4 hydrocarbon is used in combination and the proportion of the carbon number 4 hydrocarbon in the foaming agent is 5 to 80% by weight, the dispersed aluminum powder prevents the bubble film from being broken. Therefore, it is estimated that the shrinkage during foam molding and the dimensional stability of the foamed particle molded body are improved.

  When the proportion of the C 4 hydrocarbon in the foaming styrene resin in the foaming styrene resin is less than 5%, the foamed styrene resin particles are severely expanded and contracted during molding, and have excellent dimensional stability. Hard to get. When it exceeds 80% by weight, the cell membrane becomes thin, and the cell membrane is broken by the dispersed aluminum powder, so that the closed cell rate may be lowered and the heat insulation performance may be lowered.

From this point of view, the blowing agent preferably contains 10 to 50% by weight of hydrocarbon having 4 carbon atoms, more preferably 15 to 30% by weight.
When the proportion of the hydrocarbon having 4 carbon atoms in the foaming agent is less than 10% by weight, the foamed styrene resin particles are severely foamed and contracted during molding, and it is difficult to obtain a molded article having excellent dimensional stability. On the other hand, when it exceeds 50% by weight, the bubble film becomes thin, and the bubble film is broken by the dispersed aluminum powder, and the closed cell ratio may be lowered and the heat insulation performance may be lowered.

  The foaming agent content in the expandable styrenic resin particles was determined by using a gas chromatograph (detector; FID, SUS column; 4Φ × 3Φ × 4.0 m) obtained by dissolving 1 g of expandable styrene resin particles in 25 ml of dimethylformamide. , Carrier gas; nitrogen) and measurement is performed. In addition, the ratio which the C4-carbon hydrocarbon in the foaming agent in the foamable styrene resin occupies is a value obtained by dividing the amount of hydrocarbons having 4 carbons contained in the foamable styrene resin by the total foaming agent amount. .

  As the dispersant used together with the aluminum powder, liquid paraffin is preferable. Liquid paraffin includes liquid paraffin having an average carbon number of 20 to 35. The paraffins are alicyclic hydrocarbon compounds having a branched structure or a ring structure represented by CmHn (n <2m + 1, n, m are natural numbers), and have an average carbon number of 20 to 35, and at normal temperature (usually normal) 10-30 ° C.) liquid paraffins.

  Further, in the production of the foamed particle molded body used in the present invention, a method of kneading aluminum powder with a styrene resin using an extruder, a roll, a mixer, etc., a polymerization reaction during the production of the styrene resin The aluminum powder is dispersed in the styrenic resin by a method of adding and mixing the aluminum powder during the previous monomer or polymerization reaction. Next, an extrusion foaming method is employed in which a styrene resin in which aluminum powder is dispersed is melt-kneaded with a foaming agent in an extruder and extruded and foamed.

  That is, inorganic gases such as nitrogen and carbon dioxide, propane, n-butane, isobutane, n-pentane, isopentane, cyclopentane, n-hexane, cyclohexane and other aliphatic hydrocarbons, dimethyl ether, diethyl ether, furan, etc. Ethers, alcohols such as methyl alcohol, ethyl alcohol, propyl alcohol, halogenated carbonization such as HCFC-141b, HCFC-142b, HCFC-124, HFC-152a, HFC-134a There is an extrusion foaming method in which a foaming agent such as hydrogen is melt-kneaded with a styrene resin in which aluminum powder is dispersed, and extruded from the die at the tip of the extruder into the atmosphere to foam.

  Also, the styrene resin in which the aluminum powder is dispersed is melt-kneaded with an extruder, and is made into styrene resin particles by strand cutting or the like, dispersed in an aqueous medium in a sealed container, and the same as above in the sealed container. There is a dispersion medium discharge foaming method in which a foaming agent is press-fitted, one end of a sealed container is opened, and the pressure is reduced to foam.

  Further, styrene resin in which aluminum powder is dispersed is made into styrene resin particles using an extruder, and is dispersed in an airtight container and an aqueous medium, and propane, n-butane, isobutane, and n-pentane are contained in the airtight container. Aliphatic hydrocarbons such as isopentane, cyclopentane, n-hexane and cyclohexane, ethers such as dimethyl ether, diethyl ether and furan, alcohols such as methyl alcohol, ethyl alcohol and propyl alcohol -Foaming agents such as halogenated hydrocarbons such as HCFC-141b, HCFC-142b, HCFC-124, HFC-152a, HFC-134a and the like, and styrene resin particles are impregnated with the foaming agent, and sealed container After removing the styrene resin particles containing the foaming agent from the styrene system containing the foaming agent with a steam or the like Heating the fat particles, bi foaming at a predetermined ratio - and the like's foaming method.

  Among the above methods, the dispersion medium discharge foaming method and the bead foaming method are preferred from the viewpoint of little change with time in the thermal conductivity of the resulting styrene resin foamed particle molded body. Further, the step of dispersing the aluminum powder in the styrene resin and the step of foaming the styrene resin may be performed separately or simultaneously.

  In the outer heat insulating structure of the present invention, the foamed particle molded body is attached to an outer surface of a housing such as an outer wall of a building as a heat insulating material. The foamed particle molded body is lightweight, contains a specific aluminum powder, and has a small radiant heat transfer. Therefore, the outer heat insulating structure of the present invention is excellent in heat insulating properties, and it is not necessary to use an aluminum foil sheet or the like and has moisture permeability. It can be secured.

  In the case of the outer heat insulating structure of the present invention, the foamed particle molded body is attached to a housing such as a wall of a building made of concrete, structural plywood, gypsum board or the like. As a method of attaching the foamed particle molded body to the housing, 1. A heat insulating material made of the foamed particle molded body is fixed to the inner surface of the concrete mold for forming the frame, the concrete is placed in the mold, and after the concrete is solidified, the mold is removed and the foam is formed on the outer surface of the concrete frame. 1. a method of providing a particle compact; 2. a method in which an adhesive such as resin mortar is provided in a layer form on the outer surface of a pre-formed casing, and is reinforced with a glass fiber net or the like, and then the foamed particle molded body is pressure-bonded; 4. Method of pasting the foamed particle compact using an adhesive such as mortar dumpling or adhesive resin dumpling on the outer surface of the pre-formed housing, 4. Guide rails on the outer surface of the pre-formed housing at regular intervals And a method of fixing the foamed particle molded body to the guide rail by screwing or the like.

  Among the methods for fixing the heat insulating materials 1 to 4 above, the method for attaching the foamed particle molded body to the outer surface of the housing through the adhesive as shown in 2 and 3 is anti-condensation performance, workability, construction cost, etc. It is preferable because it is excellent. Further, as the adhesive, any one can be used as long as the casing and the foamed particle molded body can be bonded to each other and necessary durability is expressed. For example, conventionally known materials such as organic adhesives, cement mortars, resin mortars and the like can be used, and mortar dumplings are preferably used from the viewpoint of workability such as workability on the opposite surface with large unevenness.

As described above, on the outer surface of the heat insulating material attached to the housing, the method of directly applying tiles through a mortar layer such as mortar adhesive, the method of directly applying the finished mortar layer, and the exterior material using metal fittings and screws Thus, the outer wall is finished by a method such as mounting and spraying a finishing material. In addition, if necessary, a reinforcing layer or an adhesive can be provided between layers as appropriate to improve strength and functionality.
Further, when a mortar layer is formed on the outer surface side of the styrene resin foamed particle molded body as described above (however, a reinforcing layer or the like may be interposed between the foamed particle molded body and the mortar layer). It is preferable that a mortar layer having a moisture permeability resistance smaller than the moisture permeability resistance of the foamed particle molded body is formed so as not to hinder the moisture permeability performance of the foamed particle molded body.

An example of the preferable aspect of the outer heat insulation structure of this invention is shown in FIG.
In the outer heat insulating structure shown in FIG. 1, the foamed particle molded body 3, which is characteristic in the present invention, is attached by adhering to the casing 1 using the adhesive 2. A reinforcing layer 5 is provided on the surface of the foamed particle molded body 3 via an adhesive 4, and a finishing layer 7 is provided on the surface of the reinforcing layer 5 via an adhesive 6.
However, the present invention is not limited to the embodiment shown in FIG. For example, the reinforcing layer 5 is preferably fixed with an anchor, and is preferably fixed with an anchor together with an adhesive.

Examples of the adhesive 2, the adhesive 4, and the adhesive 6 include organic adhesives, cement mortar, and resin mortar.
Examples of the reinforcing layer 5 include glass fiber net, plywood, gypsum board, high density glass wool, and asphalt waterproof paper.
Examples of the finishing layer 7 include applying a top coat or paint with an organic finish plaster.

It is drawing which shows an example of the preferable aspect of the outer heat insulation structure of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Adhesive 3 Foamed particle molded body 4 Adhesive 5 Reinforcement layer 6 Adhesive 7 Finishing layer

Claims (5)

A styrene-based resin foam particle molded body is attached to the outer surface of the housing of the building as a heat insulating material. The foamed particle molded body has an apparent density of 10 to 100 kg / m ³ , an independent cell ratio of 60% or more, and an average cell diameter. It is 20 to 1000 μm, and the foamed particle molded body contains 0.1 to 10 parts by weight of aluminum powder having a 50% particle diameter of 0.1 to 40 μm with respect to 100 parts by weight of the styrene resin. Outer heat insulation structure characterized by The outer heat insulating structure according to claim 1, wherein the proportion of the area occupied by the aluminum powder in the cut surface of the styrene-based resin expanded particle molded body is 1 to 20%. The thickness of the styrene-based resin expanded particle molded body is 20 to 180 mm, and the moisture permeability resistance is 3.0 × 10 ^{−3 to} 30.0 × 10 ⁻³ (m ² · s · Pa) / ng. The outer heat insulating structure according to claim 1 or 2. The outer surface of the styrenic resin foamed particle molded body, a mortar layer having a moisture permeability resistance smaller than the moisture permeability resistance of the foamed particle molded body is formed. Thermal insulation structure. The outer heat insulating structure according to any one of claims 1 to 4, wherein a styrene-based resin foam particle molded body is attached to an outer surface of a building casing through an adhesive.

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