JP5023597B2 - Heat insulation variable heat insulating material, building material heat insulating material using heat conductivity variable heat insulating material, automobile engine - Google Patents

Description

  The present invention is a high-performance heat insulating material excellent in heat insulating performance, and in use, can reduce the heat insulating performance and increase the amount of heat passing, such as a building material for housing and a heat insulating material for an automobile engine, etc. The present invention relates to a heat conductivity variable heat insulating material that can be used in the field.

  In recent years, there has been a strong demand for energy saving from the viewpoint of preventing global warming. For example, in the heat insulation of houses, a heat insulating material having excellent heat insulating performance is required from the viewpoint of reducing the energy consumption of heating and cooling. Yes.

  As general heat insulating materials, fiber materials such as glass wool and foams such as urethane foam are used. However, in order to improve the heat insulation performance of these heat insulating materials, it is necessary to increase the thickness of the heat insulating material, and there is a limit to the space that can be filled with the heat insulating material, so when space saving and effective use of the space are necessary It cannot be applied.

  Therefore, a vacuum heat insulator has been proposed as a high performance heat insulating material. This is a heat insulator in which a core material serving as a spacer is inserted into a jacket material having a very low gas permeability and the inside is sealed under reduced pressure.

By using this heat insulator, since the amount of heat passing from the outside can be suppressed in winter and summer, the energy required for heating and cooling can be greatly reduced.
Japanese Patent Laid-Open No. 10-211986

  However, in the above-described conventional configuration described in Patent Document 1, the room temperature rises due to the amount of heat released from the electrical appliances in the room and the human body even in the outdoor temperature period of about 20 ° C., which does not require cooling, such as spring and autumn, and cooling and ventilation There has been a problem that energy is constantly needed for.

  The present invention solves the above-mentioned conventional problems, and if the heat conductivity of the heat insulating material can be changed arbitrarily, and heat insulation performance is required, the heat conductivity is reduced to increase the heat insulation and release the heat insulation. In this case, an object of the present invention is to provide a heat conductivity variable heat insulating material that can increase heat conductivity and allow heat to pass therethrough.

  In order to achieve the above object, the heat conductivity variable heat insulating material of the present invention comprises a heat insulating container and an internal pressure changing means for changing the internal pressure in the heat insulating container, and the internal pressure in the heat insulating container is changed by the internal pressure changing means. And the thermal conductivity of the heat insulating container is adjusted.

  Thus, for example, when a glass wool solidified core material having a porous core material in a heat insulating container and having an average gap distance of pores of the porous core material of about 50 μm is used, air at 1000 Pa is used. The thermal conductivity is about 0.002 W / mK at 0.025 W / mK and 10 Pa, and the gas thermal conductivity is 12.5 times with a slight pressure change of about 1/100 atm difference from 10 Pa to 1000 Pa. Can be variable.

  As a result, the thermal conductivity of the thermal conductivity variable heat insulating material, in which radiation and solid thermal conductivity contributions are added to the gaseous thermal conductivity contribution, is also about 9 times from 0.026 W / mK to 0.003 W / mK. A difference in heat insulation performance can be obtained.

  Thus, in the heat conductivity variable heat insulating material, the heat conductivity can be varied by a slight change in internal pressure, and the effect can be exhibited from heat insulation strengthening to heat insulation release.

  In another heat conductivity variable heat insulating material of the present invention, the internal pressure changing means in the above configuration includes an air component occlusion material that adsorbs or desorbs air components, and the internal pressure changing means controls the internal pressure in the heat insulating container. The air component storage material is located in a space communicating with the inside of the heat insulating container when changing.

  Thereby, in this heat conductivity variable heat insulating material, the internal pressure of the heat insulating container can be easily changed by changing the gas occlusion amount of the air component storage material.

  For example, in a 100 cm square and 0.5 cm thick insulated container, 50 cc of air is adsorbed up to 0.01 cc by the air component occlusion material at a standard 1 atmospheric pressure, and conversely, the entire amount is desorbed and repeated easily. Further, a pressure of 10 Pa to 1000 Pa can be obtained, and the thermal conductivity can be varied from 0.002 W / mK to about 0.025 W / mK. Therefore, the thermal conductivity of the thermal conductivity variable heat insulating material taking into account the contribution of radiation and solid thermal conduction can be easily obtained from 0.026 W / mK to 0.003 W / mK, which is about 9 times the thermal insulation performance difference. is there.

  Still another heat conductivity variable heat insulating material of the present invention, the air component occlusion material in the above configuration contains ZSM-5 type zeolite exchanged with copper ions, and among the copper sites of the ZSM-5 type zeolite, At least 60% or more of copper sites are copper monovalent sites.

  As a result, in this heat conductivity variable heat insulating material, nitrogen gas that is chemically stable and difficult to occlude can be occluded in a large volume even under high vacuum conditions due to the chemical bond strength of the copper monovalent site of ZSM-5 type zeolite. Therefore, a desired internal pressure of 10 Pa can be realized, and an excellent heat insulation performance of 0.003 W / mK from 0.026 W / mK can be realized.

  In particular, in a long-term use, even if a small amount of air enters the heat insulating body from the outside, an excellent heat insulating performance of 0.003 W / mK can be realized for a long time because the adsorption amount is large. In addition, oxygen that is relatively reactive and easily adsorbed compared to nitrogen can be occluded without any problem.

  As the air component storage material, besides the ZSM-5 type zeolite subjected to the copper ion exchange, it is composed of lithium and a metal other than lithium which have a unique ability for nitrogen adsorption and do not form an intermetallic compound with each other. Gas adsorption alloys having an enthalpy of mixing of metals greater than 0, adsorptive integrated metal complexes having open metal sites, and activated carbon and molecular sieves can be used, although the amount of adsorption is inferior.

  Further, another heat conductivity variable heat insulating material of the present invention is such that the air component occlusion material in the above configuration adsorbs air components at room temperature and removes the occluded air components when heated above a predetermined temperature higher than room temperature. The internal pressure changing means includes a heating device for heating the air component storage material.

  ZSM-5 type zeolite having a copper monovalent site can easily desorb the air component that has been occluded by heating, and occlusion starts by cooling to room temperature. A very small amount of air components can be adsorbed or released up to the internal pressure.

  Still another aspect of the present invention uses the heat conductivity variable heat insulating material of the present invention as a building material heat insulating material.

  This makes it possible to achieve a low thermal conductivity by controlling to a high degree of vacuum in winter and summer, and to minimize the heating and cooling costs by increasing the pressure and changing to a large thermal conductivity in spring and autumn. It can be air-conditioned.

  Especially in spring and autumn, the indoor temperature may rise due to heat generated from indoor housing equipment and home appliances, and cooling may be used. However, by greatly reducing the heat insulation performance, the amount of heat passing through the room is increased. It is possible to utilize a comfortable outdoor temperature.

  Moreover, it is possible to always control the optimum thermal conductivity not only in the seasonal change but also in the daily change, thereby realizing air conditioning without using heating or cooling energy.

  For example, in the next-generation energy-saving standards, the walls of wooden houses in the III area are based on glass wool of 55 mm, but when using a thermal conductivity variable insulation with a thickness of 10 mm, in winter when heating is required By setting the thermal conductivity to 0.003 W / mK, high heat insulation performance about 3 times higher than the next-generation energy saving standard equivalent to 150 mm in terms of glass wool can be obtained. By setting the rate to 0.026 W / mK, the heat insulation performance can be reduced to about 1/3 of the next generation energy saving standard corresponding to 17 mm in terms of glass wool.

  As a result, heating energy is reduced in winter, and a comfortable outdoor temperature can be used in winter, and the amount of ventilation for heat storage suppression by high heat insulation can be reduced, which contributes to significant energy reduction.

  Yet another aspect of the present invention is to cover at least a part of the surface of an automobile engine with the thermal conductivity variable heat insulating material of the present invention.

  As a result, when the engine is in operation, the heat conductivity is changed to a large value so that the heat generated by the engine flows out to the outside and the engine is not heated more than necessary. Conversely, when the engine stops, the heat conductivity is controlled to a small value. Can be insulated and insulated. As a result, the temperature at the start of the engine can be kept high, so that fuel consumption and exhaust gas can be improved.

  In the heat conductivity variable heat insulating material of the present invention, by controlling the internal pressure of the heat insulating container to an arbitrary pressure and arbitrarily changing the heat conductivity, if heat insulation performance is required, the heat conductivity is reduced. When it is desired to enhance the heat insulation and release the heat insulation, it is possible to provide a heat insulating material that can greatly increase the thermal conductivity and allow the heat to pass therethrough.

  As a result, when used in residential building materials, it is possible to control the heat insulation performance to the optimum throughout the year, thereby minimizing the energy required for heating, cooling, and ventilation. Controlling heat retention can improve fuel economy and exhaust gas quality. It is possible to realize energy minimization and thermal comfort in the living environment, contributing to global environmental protection and comfort.

The invention of a thermal conductivity variable heat insulating material according to the present invention comprises a heat insulating container and an internal pressure changing means for changing the internal pressure in the heat insulating container, and the internal pressure in the heat insulating container is changed by the internal pressure changing means. The thermal conductivity of the heat insulating container is adjusted.

  Thus, for example, when a glass wool solidified core material having a porous core material in a heat insulating container and having an air gap distance of about 50 μm in the pores of the porous core material is used, air at 1000 Pa is used. The thermal conductivity is about 0.002 W / mK at 0.025 W / mK and 10 Pa, and the gas thermal conductivity is increased by 12.5 times with a slight pressure change control of 1/100 atm difference from 10 Pa to 1000 Pa. Can be variable.

  As a result, the thermal conductivity of the thermal conductivity variable heat insulating material, in which radiation and solid thermal conductivity contributions are added to the gaseous thermal conductivity contribution, is also about 9 times from 0.026 W / mK to 0.003 W / mK. A difference in heat insulation performance can be obtained. Thus, in the heat conductivity variable heat insulating material, the heat conductivity can be varied by a slight change in internal pressure.

Further, according to the present invention, the internal pressure changing means includes an air component occlusion material that adsorbs or desorbs an air component, and the air occlusion material changes when the internal pressure in the heat insulating container is changed by the internal pressure changing means. It is located in a space communicating with the inside.

  Thereby, in this heat conductivity variable heat insulating material, the internal pressure of a heat insulation container can be easily changed by changing the gas occlusion amount of an air component storage material.

  For example, in a 100 cm square insulated container with a thickness of 0.5 cm, 50 cc of air is adsorbed up to 0.01 cc in a standard state of 1 atm and conversely desorbed up to 50 cc. Pressure can be obtained, and the air thermal conductivity can be varied from 0.025 W / mK to about 0.002 W / mK. Therefore, the heat conductivity of the heat conductivity variable heat insulating material taking into account the radiation and solid heat conduction contribution can be easily obtained from 0.026 W / mK to 0.003 W / mK, which is about 9 times the heat insulation performance difference. It can be done.

Further, the present invention provides the ZSM-5 type zeolite in which the air component storage material is subjected to copper ion exchange, and at least 60% or more of the copper sites of the ZSM-5 type zeolite are copper monovalent sites. It is characterized by being.

  As a result, in the heat conductivity variable heat insulating material using this air component storage material, chemically stable and difficult to store nitrogen gas even under high vacuum conditions due to the chemical bond strength of the copper monovalent site of ZSM-5 type zeolite. Since it can be occluded with a large capacity, a desired internal pressure of 10 Pa can be realized, and an excellent heat insulation performance from 0.026 W / mK to 0.003 W / mK can be realized. In particular, in a long-term use, even if a small amount of air enters the heat insulating body from the outside, an excellent heat insulating performance of 0.003 W / mK can be realized for a long time because the adsorption amount is large.

In the present invention, the air component occlusion material adsorbs the air component at normal temperature and desorbs the occluded air component when heated to a predetermined temperature higher than normal temperature. A heating device for heating the component storage material is included.

  As a result, the ZSM-5 type zeolite having a copper monovalent site can easily desorb the air component that has been occluded by heating, and the occlusion starts by cooling to room temperature, thus providing good response. Thus, it can be adsorbed or released up to a desired internal pressure.

In the present invention, the heat insulating container is a gas barrier heat insulating container containing a core material.

  By including the core material, the strength of the heat insulation container to prevent deformation of the heat insulation container at the time of decompression can be made small and thin, and the heat insulation container has a metal sheet with a high gas barrier property, metal foil or metal vapor deposition film, silica, alumina A resin laminate film having an inorganic oxide vapor deposition film such as the above can be used, and the heat transmitted through the gas barrier heat insulating container itself can be reduced.

  The core material is not particularly limited, such as organic or inorganic fibers, powders, solidified powders, a mixture of fibers and powders, foams, and the like.

  For example, in the core material using fibers, inorganic fibers such as glass wool, glass fibers, alumina fibers, silica alumina fibers, silica fibers, rock wool, silicon carbide fibers, natural fibers such as cotton, synthetic fibers such as polyester and nylon Known materials such as organic fibers can be used.

  In order to use the fiber, there are methods such as compression or heat compression of the fiber, compression or heat compression using water or a binder, needling, spunlace, and papermaking.

  On the other hand, in the core material using powder, inorganic powder such as silica, pearlite and carbon black, organic powder such as synthetic resin powder, or a mixture thereof is filled as it is or filled into a breathable bag. Or a method of solidifying with a fiber binder or an inorganic or organic liquid binder.

  In the foam, urethane foam, phenol foam, styrene foam, or the like can be used.

Moreover, this invention is the building material heat insulating material which used the heat conductivity variable heat insulating material.

  As a result, in winter and summer, a high degree of vacuum is controlled to increase heat insulation performance to achieve a small thermal conductivity, and in spring and autumn, the pressure is increased to change to a large thermal conductivity, thereby increasing the heating cost. In addition, air conditioning can be performed with minimum cooling costs. In particular, in spring and autumn, it is possible to utilize a comfortable outdoor temperature because there is no difference between the indoor and outdoor temperatures.

  In addition, it is possible to always control the optimum thermal conductivity not only in the seasonal change but also in the daily change so that air conditioning can be performed so that the heating and cooling energy is not used more efficiently.

  For example, in the next-generation energy saving standard, the wall of a wooden house in the III area is 55 mm in glass wool, but if a thermal conductivity variable heat insulating material with a thickness of 10 mm is used, it will be necessary in the winter when heating is required. The thermal conductivity is 0.003 W / mK, and in the spring when the outdoor temperature is sufficient, the thermal conductivity is 0.026 W / mK. As a result, in spring, the thermal insulation performance can be reduced to about 1/3, corresponding to about 17 mm. As a result, heating energy is reduced in winter, and a comfortable outdoor temperature can be utilized in spring, and the amount of ventilation due to heat storage through high insulation is reduced, contributing to energy reduction.

Moreover, this invention is the motor vehicle engine which covered at least one part of the surface with the heat conductivity variable heat insulating material.

  As a result, when the engine is in operation, the heat conductivity is changed to a large value so that the heat generated by the engine flows out to the outside and the engine is not heated more than necessary. Conversely, when the engine stops, the heat conductivity is controlled to a small value. Insulate and keep warm. As a result, the temperature at the time of starting the engine can be kept high, so that fuel consumption and exhaust gas can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a heat conductivity variable heat insulating material according to Embodiment 1 of the present invention. FIG. 2 is a characteristic diagram showing the correlation between the internal pressure of the heat insulating container and the thermal conductivity in the same embodiment.

  As shown in FIG. 1, the heat conductivity variable heat insulating material 1 of Embodiment 1 is a jacket material 3 made of a metal sheet or metal-plastics laminate film having a high gas barrier property, and continuous ventilation made of glass wool or powder. The heat-conducting container 2 is covered with a heat-insulating container 2 enclosed and sealed, and the inside of the heat-insulating container 2 is depressurized. ing.

  For example, when the relationship between the internal pressure of the heat insulating container 2 and the thermal conductivity is shown in FIG. 2, it has a thermal conductivity of 0.03 W / mK at 1000 Pa and 0.003 W / mK at 10 Pa.

  As a factor for changing the thermal conductivity, a change in gas thermal conductivity due to a change in internal pressure is dominant, and radiation and solid thermal conductivity are constant, but their contribution is small. Therefore, by controlling the internal pressure of only 990 Pa difference and about 1/100 atm difference, a heat conductivity difference of about 9 times can be obtained, easily from high heat insulation to general-purpose low heat insulation. The desired heat conductivity variable heat insulating material 1 can be obtained.

(Embodiment 2)
FIG. 3 is a cross-sectional view of the thermal conductivity variable heat insulating material in Embodiment 2 of the present invention.

  As shown in FIG. 3, the thermal conductivity variable heat insulating material 1 of the second embodiment is an outer cover material 3 made of a metal sheet or metal-plastic laminate film having a high gas barrier property, and continuous ventilation made of glass wool or powder. The heat-insulating container 2 that covers and encloses the porous core material 4 is sealed, and the inside of the heat-insulating container 2 is depressurized.

  The air guide pipe 5 has a cock 6 in the middle to connect the heat insulating container 2 and the tank 7, and when the cock 6 is opened, a space containing the porous core material 4 in the heat insulating container 2 The space filled with the air component occlusion material 8 in the tank 7 communicates, and when the cock 6 is closed, the space containing the porous core material 4 in the heat insulating container 2 and the air component in the tank 7 The space filled with the occlusion material 8 is not communicated.

  In Embodiment 2, the thermal conductivity of the heat insulating container 2 is adjusted by changing the internal pressure in the heat insulating container 2 with the air guide pipe 5 having the cock 6 in the middle and the tank 7 filled with the air component storage material 8. The internal pressure changing means is configured.

  The average air gap distance of the porous core material 4 is about 50 μm, and has a characteristic that the gas thermal conductivity can be greatly changed by a slight pressure change as shown in FIG. The pressure of the porous core material 4 (pressure in the heat insulating container 2) is maintained at 1000 Pa of diluted air, and the air component storage material 8 blocked by the cock 6 is maintained at 10 Pa or less. When the cock 6 is opened, the air component storage material 8 can adsorb 1000 Pa of rare gas in the porous core material 4 through the air guide tube 5 and reduce the pressure to 10 Pa. As a result, the heat insulating container 2 has a low thermal conductivity from 0.026 W / mK to 0.003 W / mK, and high heat insulation can be realized in a short time.

  Next, when the air occluded in the air component occlusion material 8 is desorbed in the cock 6 open state, the internal pressure of the heat insulating container 2 rises to 1000 Pa, and the thermal conductivity is increased from 0.003 W / mK to 0.026 W. / MK.

  In this way, the thermal conductivity could be changed greatly with a slight pressure control, but by moving this pressure change with the air component storage material 8 repeatedly by adsorption and desorption, it is possible to easily move lean air gas. It was.

(Embodiment 3)
FIG. 4 is a cross-sectional view of the thermal conductivity variable heat insulating material according to Embodiment 3 of the present invention.

  As shown in FIG. 4, the heat conductivity variable heat insulating material 1 of the third embodiment is a ZSM-5 type in which the air component storage material 8 in the heat conductivity variable heat insulating material 1 of the second embodiment is exchanged with copper ions. Of the copper sites of ZSM-5 type zeolite 9 including zeolite 9, at least 60% or more of the copper sites are copper monovalent sites, and other configurations are variable in the thermal conductivity of the second embodiment. The configuration is the same as that of the heat insulating material 1.

  ZSM-5 type zeolite 9 having a copper monovalent site can easily desorb the air component stored by heating, and the storage starts by cooling to room temperature. A small amount of air component can be adsorbed or released up to the internal pressure of the gas.

  Incidentally, the equilibrium adsorption amount of the ZSM-5 type zeolite 9 subjected to the copper ion exchange has a nitrogen gas adsorption capacity of 3.5 cc / g in a standard state at 10 Pa. Similarly, oxygen has an adsorption capacity of 2.8 cc / g.

  The heat insulating container 2 has a size of 100 cm × 100 cm × 0.5 cm, and 20 g of ZSM-5 type zeolite 9 subjected to copper ion exchange is enclosed. The heat insulating container 2 is initially maintained at a reduced pressure of 1000 Pa. The tank 7 filled with the air component storage material 8 made of ZSM-5 type zeolite 9 exchanged with copper ions is evacuated to 10 Pa or less and sealed.

  When the cock 6 of the conducting pipe 5 is opened, about 50 cc of air remaining in the heat insulating container 2 in the standard state of 1 atm is passed through the conducting pipe 5 through the air component storage material 8 made of ZSM-5 type zeolite 9. Adsorbed and the equilibrium pressure drops to 10 Pa. As a result, the heat conductivity of the heat insulating container 2 decreased from 0.026 W / mK to 0.003 W / mK, and high heat insulation was achieved. Thus, since it is excellent in nitrogen adsorption and oxygen can be adsorbed in a large volume at a low pressure, the adsorption amount can be applied in a practical use amount.

(Embodiment 4)
FIG. 5 is a cross-sectional view of a thermal conductivity variable heat insulating material in Embodiment 4 of the present invention.

  As shown in FIG. 5, the heat conductivity variable heat insulating material 1 of the fourth embodiment is configured so that the air component storage material 8 in the tank 7 is placed close to the tank 7 of the heat conductivity variable heat insulating material 1 of the third embodiment. A heating device 10 for heating is provided, and the other configuration is the same as that of the heat conductivity variable heat insulating material 1 of the third embodiment.

  The heating device 10 in Embodiment 4 can control the temperature of the air component storage material 8 from room temperature to about 150 ° C. By this temperature change, the adsorption and desorption of the air component storage material 8 can be repeated, and the movement of the diluted air gas can be easily performed.

  That is, in order to increase the internal pressure of the heat insulating container 2 to 1000 Pa, the air component storage material 8 is heated to 150 ° C., and the stored nitrogen and oxygen are desorbed, and through the air guide tube 5 with the cock 6 open. The internal pressure of the heat insulating container 2 is increased.

  Conversely, in order to lower the internal pressure of the heat insulating container 2 to 10 Pa, the heating is stopped to return to room temperature, and the nitrogen and oxygen in the heat insulating container 2 are passed through the air guide tube 5 with the cock 6 open to store the air component. 8 is used for adsorption. By repeating this, the internal pressure of the heat insulating container 2 can be arbitrarily controlled.

(Embodiment 5)
FIG. 6 is a sectional view of a house in which a building material heat insulating material using a heat conductivity variable heat insulating material in Embodiment 5 of the present invention is used as a heat insulating wall.

  As shown in FIG. 6, the heat insulating wall 12 constituting the house 11 is composed of an exterior material 13, a ventilation layer 14, a building material heat insulating material 15, and an interior material 16 in order from the door exterior to the room interior. The building material heat insulating material 15 according to the fifth embodiment includes the heat conductivity variable heat insulating material 1 according to the first embodiment or the heat conductivity variable heat insulating material 1 according to any one of the second to fourth embodiments, and has a thickness of 1 cm. is there.

  In winter and summer, in order to reduce the energy required for heating and cooling, the thermal conductivity variable heat insulating material 1 is maintained at 0.003 W / mK, which is equivalent to 15 cm when replaced with general-purpose glass wool. The thermal insulation performance is about 3 times the standard thickness of 5.5 cm.

  In spring and autumn, the thermal conductivity variable heat insulating material 1 is maintained at 0.026 W / mK and is equivalent to about 1.7 cm when replaced with general-purpose glass wool. The heat insulation performance is about 1/3 of that of the room, and a comfortable outdoor temperature environment can be used indoors.

  In particular, since heat generated from household equipment and home appliances is not stored indoors, heat can be exhausted with less conventional ventilation energy.

(Embodiment 6)
FIG. 7 is a schematic cross-sectional view of an automobile engine in which at least a part of the surface is covered with a thermal conductivity variable heat insulating material in Embodiment 6 of the present invention.

  As shown in FIG. 7, the automobile engine of the sixth embodiment is surfaced with the thermal conductivity variable heat insulating material 1 of the first embodiment or the thermal conductivity variable heat insulating material 1 of any of the second to fourth embodiments. Covering at least a part of. The thickness of the heat conductivity variable heat insulating material 1 in the sixth embodiment is 0.5 cm.

  While the automobile engine 17 is in operation, the heat conductivity variable heat insulating material 1 is maintained at 0.026 W / mK, and is equivalent to about 0.6 cm when replaced with general-purpose glass wool, and does not hinder heat dissipation. On the other hand, at the same time when the automobile engine 17 was stopped, the heat conductivity variable heat insulating material 1 could be kept at a temperature 40 ° C. higher than the outside air temperature even when left for 24 hours in order to control it to 0.003 W / mK. As a result, it was possible to improve the fuel efficiency and exhaust gas quality at the start.

  As described above, since the heat conductivity variable heat insulating material according to the present invention can change the heat insulating performance as necessary, heat insulation and heat radiation can be realized in the same system, and widely applied in the field of heat insulation and heat insulation and heat radiation. Can do.

Sectional drawing of the heat conductivity variable heat insulating material in Embodiment 1 of this invention The characteristic view which shows the correlation of the internal pressure and heat conductivity of the heat insulation container in Embodiment 1 and Embodiment 2 of this invention Sectional drawing of the heat conductivity variable heat insulating material in Embodiment 2 of this invention Sectional drawing of the heat conductivity variable heat insulating material in Embodiment 3 of this invention Sectional drawing of the heat conductivity variable heat insulating material in Embodiment 4 of this invention Sectional drawing of the house which used the building material heat insulating material using the heat conductivity variable heat insulating material in Embodiment 5 of this invention for the heat insulating wall Schematic sectional view of an automobile engine in which at least a part of the surface is covered with a thermal conductivity variable heat insulating material in Embodiment 6 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Thermal conductivity variable heat insulating material 2 Thermal insulation container 4 Porous core material 5 Air guide pipe 6 Cock 7 Tank 8 Air component occlusion material 9 Copper ion exchanged zeolite 10 Heating device 15 Building material heat insulating material 17 Automotive engine

Claims (6)

It consists of a heat insulating container and an internal pressure changing means for changing the internal pressure in the heat insulating container, wherein the internal pressure in the heat insulating container is changed by the internal pressure changing means to adjust the thermal conductivity of the heat insulating container. A heat conductivity variable heat insulating material, wherein the heat insulating container is a covering material made of a metal sheet having a high gas barrier property or a film containing a metal, and an organic or inorganic fiber, powder or powder is placed inside the outer skin material. A solid material, a mixture of fiber and powder, a solid material such as a foam is enclosed and sealed, and the inside is decompressed , and the internal pressure changing means includes an air component storage material that adsorbs or desorbs an air component. The air component storage material contains ZSM-5 type zeolite subjected to copper ion exchange, and at least 60% or more of the copper sites of the ZSM-5 type zeolite contain at least one copper monovalent copper site. By a preparative, in internal pressure 10Pa in the insulated container, the thermal conductivity of the variable heat insulating material thermal conductivity, characterized by comprising a 0.026W / mK~0.003W / mK. The internal pressure changing means includes an air component occlusion material that adsorbs or desorbs air components, and the air pressure occlusion material communicates with the inside of the heat insulating container when the internal pressure changing means changes the internal pressure in the heat insulating container. The heat conductivity variable heat insulating material according to claim 1, wherein the heat conductivity variable heat insulating material is located. The air component storage material adsorbs the air component at normal temperature and desorbs the stored air component when heated to a predetermined temperature higher than normal temperature, and the internal pressure changing means heats the air component storage material. The heat conductivity variable heat insulating material according to claim 1 or 2 , further comprising a heating device. The heat conductivity variable heat insulating material according to any one of claims 1 to 3 , wherein the heat insulating container is a gas barrier heat insulating container containing a core material. The building material heat insulating material using the heat conductivity variable heat insulating material as described in any one of Claim 1 to 4 . An automobile engine having at least a part of its surface covered with the thermal conductivity variable heat insulating material according to any one of claims 1 to 4 .

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