JP2016222979A - Thermal barrier insulation material, production method thereof, thermal barrier insulation coating and formation method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal barrier insulation material for forming a thermal barrier insulation coating having a thermal barrier property and a heat insulation property; and to provide a production method thereof, the thermal barrier insulation coating formed of the thermal barrier insulation material, and a formation method thereof.SOLUTION: A thermal barrier insulation material containing thermal barrier insulation powder in which the surface of metal oxide 22, 23 is coated with zinc 21 and boron oxide 20, boron oxide and zinc is sprayed onto the surface of a metal or ceramic substrate 10 by a flame coating method, to thereby form a thermal barrier insulation coating 1. The metal oxide is a mixture of magnesium oxide powder and silicon oxide, or a fired body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat insulating heat insulating material having both heat insulating properties and heat insulating properties, a method for producing the same, a heat insulating heat insulating film formed from the heat insulating heat insulating material, and a method for forming the heat insulating heat insulating film.

  Currently, almost all building materials and thermal equipment are covered with thermal insulation. The heat insulating material is used for the purpose of improving the efficiency of air conditioning in the building and maintaining the temperature difference between the inside of the equipment such as a refrigerator and a water heater and the outside of the equipment. The heat insulation here is to prevent heat transmitted by heat conduction or convection. The heat insulating material prevents heat conduction and convection by slowing the way heat is transmitted. However, in recent years, energy-saving technology has been attracting attention, and not only the heat insulation effect is emphasized on the outer walls of roofs, outer walls, and substations of buildings, but also paints that block radiant heat from sunlight. Or, in the automotive field, heat-shielding paints reflect and absorb sunlight and heat to suppress temperature rise and demonstrate outstanding performance in energy-saving effects of indoor equipment such as air conditioners. The development of thermal barrier paint and painting technology is expected.

  On the other hand, heat transfer includes radiation in addition to conduction and convection. The heat insulating material has low performance to prevent heat transmitted by the radiation. Therefore, as a method for preventing the movement of heat due to radiation, a method using a heat shielding material that repels heat is known.

  Patent Document 1 discloses a heat insulating heat insulating material having both properties of a heat insulating material and a heat insulating material. The technology of Patent Document 1 is characterized in that a network structure is built inside a heat insulating material to form minute holes, thereby preventing heat transfer due to radiation.

  The technique of Patent Document 1 is effective because it provides a heat-insulating and heat-insulating effect with an inexpensive material when the energy transmitted from the heat source is small. However, for example, in the case where the influence of radiant heat from sunlight or heat conduction transmitted from other heat sources is large, a material or structure having better heat insulation and heat insulation properties from the viewpoint of energy saving technology. It is necessary to propose.

  Furthermore, in the case where both radiant heat and conduction heat are transmitted to the metal plate material, the energy saving effect is enhanced if a film having the characteristics of both a heat shield and a heat insulating material is formed on the surface of the metal plate material. Therefore, it is required to produce a film having heat shielding and heat insulating effects.

Special table 2011-510167 gazette JP 2011-127145 A

  The present invention has been proposed in view of such a conventional situation, and includes a heat insulating heat insulating material that forms a heat insulating heat insulating film having heat insulating properties and heat insulating properties, a manufacturing method thereof, and a heat insulating heat insulating material thereof. It is an object of the present invention to provide a heat-insulating and heat-insulating film to be formed and a method for forming the same.

  The thermal insulation heat insulating material according to the present invention for achieving the above-described object is a metal oxide in a thermal insulation thermal insulation material used for forming a thermal insulation thermal insulation film by a thermal spraying method on the surface of a metal substrate or a ceramic substrate. The heat shielding heat insulating powder whose surface is covered with zinc and boron oxide, boron oxide, and zinc are contained.

  Moreover, the manufacturing method of the heat insulation heat insulating material which concerns on this invention for achieving the objective mentioned above is the heat insulation heat insulating material used for formation of the heat insulation heat insulation film by the thermal spraying method on the surface of a metal base material or a ceramic base material. In this production method, boron oxide and zinc are further added to the heat-insulating and heat-insulating powder produced by mixing a metal oxide, zinc and boron oxide and heating them at a temperature equal to or higher than the melting points of zinc and boron oxide.

  In order to achieve the above-mentioned object, the thermal barrier thermal insulation film according to the present invention is a thermal barrier thermal insulation film formed on the surface of a metal substrate or a ceramic substrate, and the thermal barrier thermal insulation film has a thermal barrier thermal insulation layer. In the heat insulating and heat insulating layer, zinc and boron oxide are interposed in the gap between the metal oxides.

  In addition, a method for forming a thermal barrier heat insulating film according to the present invention for achieving the above-described object includes a thermal barrier thermal insulating powder in which a metal oxide surface is covered with zinc and boron oxide, boron oxide, and zinc. The heat insulation heat insulating material to contain is sprayed on the surface of a metal base material or a ceramic base material by a thermal spraying method, and has a heat insulation heat insulation layer.

  ADVANTAGE OF THE INVENTION According to this invention, the heat insulation heat insulating material which can form the film which has heat insulation and heat insulation is obtained, and the heat insulation heat insulation film which has the outstanding heat insulation and heat insulation is obtained from the heat insulation heat insulating material. .

It is a figure explaining the heat insulation heat insulation effect of the heat insulation heat insulation film formed by the thermal spraying method and the dip coating method using the heat insulation heat insulating material to which this invention is applied. In the examples, by setting the heat source on the uncoated metal side, an infrared camera was used to measure the temporal change of the surface temperature at one point position of the surface of the thermal barrier thermal insulation film by flame spraying and the uncoated metal surface. It is a figure which shows a result. Results of measuring the temporal change of the surface temperature at one point on the surface of the thermal insulation thermal insulation film by flame spraying and the uncoated metal surface using an infrared camera by installing the heat source on the thermal insulation thermal insulation film side in the examples FIG.

Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. Note that the present invention is not limited to the following detailed description unless otherwise specified.
1. 1. Thermal insulation thermal insulation film 2. Formation method of heat-insulating and heat-insulating film Example

<< 1. Thermal barrier insulation film >>
(Thermal insulation film)
The heat-insulating and heat-insulating coating 1 is formed as a base material 10 on the surface of a metal base material or a ceramic base material, and imparts a heat shielding effect and a heat insulating effect to the surface of the metal base material or the ceramic base material. As shown in FIG. 1, the heat-insulating and heat-insulating film 1 is formed on the surface of the base material 10, and includes a heat-insulating and heat-insulating layer 2 or a heat-insulating and heat-insulating layer 2 and a heat-insulating layer 3. Examples of the base material 10 include steel and concrete used for the surface of a building structure that receives radiant heat, bricks, and the like. When the heat shield layer 3 is further formed on the heat shield heat insulating layer 2, the heat shield effect is further enhanced, and heat is not easily transmitted to the inside of the structure.

(Thermal insulation layer)
The heat insulation heat insulation layer 2 is a layer having heat insulation properties and heat insulation properties. The heat-insulating and heat-insulating layer 2 is composed of boron oxide 20 and zinc 21 that are melted and solidified, and, for example, magnesium oxide powder 22 and silicon oxide 23. The heat-insulating and heat-insulating layer 2 is formed by applying a heat-insulating and heat-insulating material containing a metal-oxide-containing heat-insulating and heat-insulating powder, boron oxide and zinc by flame spraying at a temperature equal to or higher than the melting points of boron oxide and zinc. It is formed by spraying. Boron oxide and zinc contained in the heat insulation heat insulating powder are melted and solidified to become boron oxide 20 and zinc 21, and are interposed between the metal oxides in the heat insulation heat insulation layer 2.

(Thermal insulation)
The heat insulating heat insulating material is a heat insulating heat insulating powder in which the surface of the metal oxide is covered with boron oxide and zinc, and a metal oxide powder composed of boron oxide and zinc. Since such a heat insulation heat insulating material is low in cost, it can be manufactured at low cost. In the case of construction, substation equipment, or thermal equipment, the specific surface area of the heat insulating heat insulating material is preferably in the range of 150 to 550 cm ² / g. In the case of an automobile, since the demand for the glossiness of the painted surface is high, the specific surface area of the heat insulating heat insulating material is preferably in the range of 550 to 16500 cm ² / g.

  Moreover, after forming the heat insulation heat insulation layer 2 by the flame spraying method, the heat insulation heat insulating material can further use a dip coat method. Since such a heat insulation heat insulating material can be used also for hybrid thermal spraying, there is almost no restriction on the use of thermal spray equipment.

(Thermal insulation powder)
The heat-insulating and heat-insulating powder is a metal oxide whose surface is covered with boron oxide and zinc. Specifically, the heat-insulating and heat-insulating powder is composed of a mixture of magnesium oxide powder 22 and silicon oxide 23 as a metal oxide, or a surface of a fired body of magnesium oxide powder 22 and silicon oxide 23 powder, boron oxide and zinc. It is covered with.

  As the metal oxide, it is preferable to use a mixture of magnesium oxide powder 22 and silicon oxide 23 or a fired body of magnesium oxide powder 22 and silicon oxide 23 powder. Magnesium oxide has a high melting point among oxides and can reflect heat. Therefore, magnesium oxide is suitable as a material for obtaining a heat insulating and heat insulating effect.

  The mixture is a mixture of magnesium oxide powder 22 and silicon oxide 23. The mixture of the magnesium oxide powder 22 and the silicon oxide 23 includes a plate-like primary aggregate in which a plurality of periclases are aggregated in a plate shape. The average crystal diameter of the periclase crystallite is preferably in the range of 30 nm to 100 nm, and more preferably in the range of 50 nm to 60 nm. The average crystallite diameter of the periclase crystallite can be measured by an X-ray powder diffraction method using silicon as an internal standard.

  The plate-like primary aggregate is preferably contained in the magnesium oxide powder 22 by 60% by mass or more, more preferably 80% by mass or more. The plate-like primary aggregate may form a secondary aggregate. The particle diameter in the secondary aggregate measured by the X-ray diffraction method is preferably 80 μm or less, more preferably 70 μm or less, more preferably 50 μm in the case of construction, substation equipment or thermal equipment related use. It is particularly preferred that In the case of automobiles, the particle size is preferably 30 μm or less, more preferably 10 μm or less, and particularly preferably 1 μm or less.

  In the heat-insulating and heat-insulating layer 2, the orientation of the plate-like primary aggregates by the elliptical sphere-shaped particles has a large area that receives radiant heat, and the formed film can be thinned. When the average length is for construction, substation equipment or thermal equipment, it is preferably in the range of 30 to 100 μm, and more preferably in the range of 50 to 70 μm. In the case of automobile use, it is preferably 30 μm or less, more preferably 10 μm or less, and particularly preferably 1 μm or less.

  The average size of the primary aggregate of particles is preferably in the range of 85 μm or less, and more preferably in the range of 10 to 30 μm, in the case of building, substation equipment or thermal equipment related applications. In the case of automotive use, the thickness of the plate-like primary aggregate is thinner than that for construction, substation equipment or thermal equipment, so it is preferably in the range of 3-30 μm, and in the range of 3-15 μm. Is more preferable. A plate-like primary aggregate having a large thickness with respect to the length suppresses the ease of heat transfer inside the structure. The particle diameter and thickness of the primary aggregate of particles can be measured from an enlarged image of an electron microscope.

  The fired body is obtained by mixing magnesium oxide powder 22 and silicon oxide 23 powder and firing at 600 to 900 ° C.

As the magnesium oxide powder 22 used for the mixture or the fired body, a commercially available product or a product obtained by a production method described later can be used. The magnesium oxide powder 22 preferably has an average crystallite diameter in the range of 30 to 100 μm in the case of building, substation equipment or thermal equipment related applications. The specific surface area of the magnesium oxide powder 22 is preferably in the range of 120~600cm ² / g, and more preferably in a range of from 160~550cm ² / g. In the case of automobiles, the average crystallite diameter is preferably in the range of 1 μm to 30 μm, and the specific surface area is preferably in the range of 550 to 16500 cm ² / g. As the specific surface area of the magnesium oxide powder 22 increases, it becomes difficult for heat to be transferred to the inside of the structure, and the heat insulating and heat insulating effect of the heat insulating and heat insulating layer 2 is enhanced.

  The silicon oxide 23 has a heat insulating and heat insulating effect similarly to magnesium oxide. As the silicon oxide 23 used for the mixture, since it is a high-temperature material, the particle diameter hardly changes during firing, and those having a particle diameter of 0.1 to 3 μm are preferable. By using the silicon oxide 23 having such a particle diameter, silicon oxide is interspersed in the heat-insulating and heat-insulating layer 2, and heat is hardly transmitted, and the heat-insulating and heat-insulating effect is enhanced.

  Since the molten and solidified zinc 21 melts in the firing process, there is no particular requirement for the average particle size as an additive, and therefore, the same particle size as that of magnesium oxide may be used. In addition, the zinc 21 can use a commercially available thing. Further, the zinc contained in the heat insulating heat insulating material together with the heat insulating heat insulating powder may be the same as zinc 21.

  Since the melted and solidified boron oxide 20 is melted in the firing process, there is no particular requirement for the average particle size as an additive, and therefore, it may be the same as the particle size of magnesium oxide. Further, the boron oxide contained in the heat insulating heat insulating material together with the heat insulating heat insulating powder may be the same as the boron oxide 20.

  The heat-insulating and heat-insulating powder is a mixture of 25 to 35% by mass of silicon oxide 23, 1 to 10% by mass of boron oxide, and 5 to 10% by mass of zinc with respect to the total mass of the magnesium oxide powder 22. It consists of. Alternatively, the heat-insulating and heat-insulating powder is composed of 5 to 10% by mass of silicon oxide 23 powder, 1 to 10% by mass of boron oxide, and 5 to 10% by mass of zinc with respect to the total mass of the magnesium oxide powder 22. Consists of.

  Specifically, the heat insulating heat insulating material is a mixture containing 1 to 10% by mass of boron oxide and 5 to 15% by mass of zinc with respect to the total mass of the magnesium oxide powder 22, and further 1 to 10% by mass. % Boron oxide and 5-15 mass% zinc.

(Heat shield layer)
The heat shielding layer 3 is made of at least one of phenolic resin, solvent-type acrylic resin for automobiles, amino alkyd resin for automobiles (Amilac), aqueous acrylic resin for construction and outer walls of substation facilities, and urethane resin for construction. Become. The heat shielding layer 3 has a heat shielding property due to the heat reflection effect of phenol resin, solvent-type acrylic resin, amino alkyd resin, aqueous acrylic resin, and urethane resin. Therefore, the heat-insulating layer 3 is further laminated on the heat-insulating and heat-insulating layer 2 to improve the heat-insulating property of the substrate 10. In addition, phenol resin, solvent-type acrylic resin, amino alkyd resin, water-based acrylic resin, and urethane resin, when in contact with metal oxide, enter the micropores inside the metal oxide and form a dense surface that reflects heat. The heat shielding layer 3 having high strength is formed. Therefore, when the thermal barrier layer 3 is laminated, a metal oxide may be added to at least one of a phenol resin, a solvent-type acrylic resin, an aminoalkyd resin, an aqueous acrylic resin, and a urethane resin. Further, since the heat shielding layer 3 is formed by a dip coating method which is a wet method, the surface is uniform. Therefore, the heat-insulating and heat-insulating material provided with the heat-insulating layer 3 is superior in strength to the heat-insulating and heat-insulating material produced only by the thermal spraying method which is a dry method.

≪2. Method of forming a thermal barrier thermal insulation film >>
Next, a method for forming the heat-insulating and heat-insulating film 1 shown in FIG. 1 will be described step by step.

(Method for producing thermal insulation heat insulating powder)
The heat insulation heat insulating powder covers the surface of the mixture of magnesium oxide 22 and silicon oxide 23 with boron oxide and zinc to produce a heat insulation heat insulation powder.

  In the method for producing the heat-insulating and heat-insulating powder, first, a mixture is produced. The magnesium oxide powder 22 used for manufacturing the mixture can be manufactured by firing magnesium hydroxide powder at a high temperature. Specifically, the magnesium hydroxide powder is produced by firing at a temperature of 350 ° C. to 900 ° C., preferably 400 ° C. to 600 ° C. In addition, the average particle diameter of magnesium hydroxide is 1 μm to 30 μm in the case of a mixture for automobiles, and 30 μm to 100 μm in the case of a mixture for construction, substation equipment or thermal equipment. Moreover, what contains the plate-shaped magnesium hydroxide particle | grains in these ranges and whose content of magnesium oxide after heating at 1400 degreeC is 98.0 mass% or more is preferable. Next, 25-35 mass% silicon oxide 23 is mixed with respect to the mass of this magnesium oxide powder 22, and a mixture is manufactured.

  Next, the surface of the produced mixture is covered with boron oxide and zinc. In the manufacturing method of heat insulation heat insulation powder, 1-10 mass% boron oxide and 5-15 mass% zinc are added to a mixture with respect to the mass of the magnesium oxide powder 22 whole. The addition amount of boron oxide and zinc is 1 to 10% by mass and 5 to 15% by mass with respect to the total mass of the magnesium oxide powder 22, respectively, so that a portion not covered with boron oxide 20 and zinc 21 is generated. Without this, the magnesium oxide powder 22 can be sufficiently covered with the boron oxide 20 and the zinc 21.

  In the method for producing the heat-insulating and heat-insulating powder, the mixture, boron oxide and zinc are then heated at a temperature equal to or higher than the melting point of zinc (419.5 ° C.) and the melting point of boron oxide (450 ° C.). The heating temperature is preferably 450 ° C. or higher and 600 ° C. or lower. In this method, a liquid phase of boron oxide and zinc is formed by heating at a temperature equal to or higher than the melting points of boron oxide and zinc, and this liquid phase covers the surface of the mixture. The liquid phase boron oxide and zinc covering the surface become solid phase boron oxide 20 and zinc 21 when cooled. In this method, the surface of the mixture is thus covered with boron oxide 20 and zinc 21 to obtain a heat insulating and heat insulating powder.

Another method for covering the mixture with boron oxide and zinc is to add boric acid instead of boron oxide. Specifically, 1-10 mass% boric acid and 5-10 mass% zinc are added to a mixture with respect to the mass of the magnesium oxide powder 22 whole. Since boric acid is dehydrated at 300 ° C., the reaction of 2H ₂ BO ₃ → B ₂ O ₃ + 3H ₂ O proceeds and becomes boron oxide by setting the heating temperature to 300 ° C. or higher. Therefore, it becomes a mixture of magnesium oxide powder 22, silicon oxide 23, boron oxide and zinc by heating the mixture, boric acid and zinc at 300 ° C. to 460 ° C. In this method, the heat-insulating and heat-insulating powder is obtained by further heating at a temperature equal to or higher than the melting point of boron oxide.

  Further, as a method for producing the heat insulating and heat insulating powder, not only the mixture of the magnesium oxide powder 22 and the silicon oxide 23 is covered with boron oxide and zinc, but also the fired body of the magnesium oxide powder 22 and the silicon oxide 23 powder is boron oxide. And you may manufacture a heat insulation heat insulation powder by covering with zinc.

  Next, the manufacturing method of the heat insulation heat insulation powder using a sintered body is demonstrated.

  In the manufacturing method of the heat insulation heat insulation powder using a sintered body, a sintered body is first manufactured. Specifically, first, 5 to 10% by mass of silicon oxide 23 powder is added to the total mass of the magnesium oxide powder 22. By adding 5 to 10% by mass of the powder of silicon oxide 23, a heat insulating and heat insulating effect by silicon oxide can be obtained, and a higher heat insulating and heat insulating effect than that of magnesium oxide alone can be achieved. In the method for manufacturing a fired body, a mixture of magnesium oxide powder 22 and silicon oxide powder 23 is then fired at 600 ° C to 900 ° C. The firing furnace for firing is not particularly limited, and for example, a rotary kiln, a Heleshov furnace, and an electric furnace can be used.

  Next, the obtained fired body is covered with boron oxide and zinc to produce a heat insulating and heat insulating powder. In the method of covering the fired body with boron oxide and zinc, boron oxide and zinc are added to the fired body in the same manner as the method of covering the mixture. Next, the mixture of the fired body, boron oxide and zinc is heated at 450 ° C. to 600 ° C. In this method, the liquid phase boron oxide and zinc cover the surface of the fired body, and a heat insulating and heat insulating powder can be obtained. In this method, since boron oxide and zinc are in a liquid phase state, and the resulting liquid phase covers the crystal grains of the fired body, the surface bond formation between the magnesium oxide powder 22 and the silicon oxide 23 powder is performed at a low temperature. Is promoted.

  As described above, boric acid may be used in place of boron oxide as a method of covering the fired body with boron oxide and zinc. In the method of covering the fired body with boric acid, first, 5 to 10% by weight of zinc having an average particle diameter of 50 μm to 100 μm and 1 to 10% by weight of boric acid with respect to the weight of the whole fired body. Added. Next, in the method of covering the fired body with boric acid, this mixture is heated at 300 ° C. to 460 ° C., boric acid is converted into boron oxide, and further heated at a temperature higher than the melting point of boron oxide, thereby oxidizing the mixture. A fired body covered with boron and zinc can be obtained.

  The added zinc is interposed between the magnesium oxide powder 22, the silicon oxide 23 powder, and the boron oxide fine particles. The void | hole which arises by interposing zinc improves the intensity | strength of the network structure of a metal oxide.

  The heat-insulating and heat-insulating powder made of a mixture or fired body of boron oxide and zinc-covered metal oxide made as described above is crystalline, and is an average particle of a mixture or fired body for automobiles. The average particle diameter of the mixture or the fired body is 30 μm to 100 μm. The average particle diameter can be measured with an electron microscope.

(Method of manufacturing heat insulation material)
Next, the manufacturing method of a heat insulation heat insulating material is demonstrated. The heat insulating heat insulating material is manufactured by adding boron oxide and zinc to the heat insulating heat insulating powder. Specifically, 1 to 10% by mass of boron oxide and 5 to 15% by mass with respect to the total mass of the heat-insulating and heat-insulating powder composed of a mixture or fired body of a metal oxide covered with boron oxide and zinc. A heat insulation heat insulating material is manufactured by adding and stirring zinc.

(Method of forming a heat insulating and heat insulating layer)
The heat-insulating and heat-insulating layer 2 is formed by spraying the heat-insulating and heat-insulating material onto the surface of the metal or ceramic substrate 10 by a thermal spraying method such as flame spraying. Since there is no restriction | limiting by a thermal spraying method, the thermal insulation heat insulating material may use what kind of thermal spraying method, if the thermal insulation thermal insulation material can be heat-melted and sprayed on the surface of the base material 10. FIG. In the method of forming the thermal insulation heat insulating layer 2, the thermal insulation thermal insulation material is used as a thermal spray material, and the thermal insulation thermal insulation material is heated at the moment of thermal spraying, so that boron oxide and zinc covering the mixture or the fired body are used. And the added boron oxide and zinc become liquid. In this method, in a state where boron oxide and zinc are in a liquid phase, the heat insulating and heat insulating layer 2 is formed by spraying the base material 10 at a high speed and cooling the boron oxide and zinc into a solid phase. In the method for forming the heat-insulating and heat-insulating layer 2, the magnesium oxide powders 22 are connected when the liquid phase of boron oxide and zinc is rapidly solidified by solidification. Further, silicon oxide 23 is interposed in the gap between the magnesium oxide powders 22. As a result, pores are formed inside the heat-insulating and heat-insulating layer 2 to form a fine structure like a network structure. Such a method for forming the heat-insulating and heat-insulating layer 2 improves the heat-insulating and heat-insulating effect by creating a network structure, thereby increasing the heat-insulating effect while having heat insulation properties.

  In this method of forming the heat insulating and heat insulating layer 2, since the heat insulating heat insulating material is sprayed onto the base material 10 by the thermal spraying method, the amount of heat carried by the spray particles is small, and the influence of the heat on the base material 10 can be suppressed. Furthermore, in the method of forming the heat insulation heat insulation layer 2, the adhesion between the substrate 10 and the heat insulation heat insulation layer 2 can be improved. Moreover, the heat insulation heat insulation layer 2 can further enhance the heat insulation effect by further laminating the heat insulation layer 3 made of phenol resin on the surface of the heat insulation heat insulation layer 2.

(Method of forming a thermal barrier layer)
The heat shielding layer 3 is formed by a dip coating method in which the base material 10 on which the heat shielding heat insulating layer 2 is formed is immersed in one or more solutions of phenol resin, solvent-type acrylic resin, amino alkyd resin, aqueous acrylic resin, and urethane resin. Can be formed. Further, when the phenolic resin comes into contact with the metal oxide, it enters into the micropores inside the metal oxide, forms a dense surface that reflects heat, and forms the heat shielding layer 3 with high strength. Therefore, when laminating the heat shielding layer 3, a metal oxide may be added to the phenol resin.

  As described above, the method for forming the thermal insulation thermal insulation film 1 using the thermal insulation thermal insulation material is to form the thermal insulation thermal insulation layer 2 by the flame spraying method, and then laminate the thermal insulation layer 3 by the dip coating method. Can do.

≪3. Examples >>
Examples of the present invention will be described below, but the present invention is not limited to these examples.

<Preparation of thermal insulation>
In this example, first, magnesium oxide powder of about 30 to 100 μm was prepared by adding 5 to 15 mass% zinc and 25 to 35 mass% silicon oxide with respect to the total mass of the powder. . Furthermore, in this example, 5% by mass of boron oxide was added to the mixture with respect to the total mass of the magnesium oxide powder, and the mixture was heated at 600 ° C. in a baking furnace. By heating at 600 ° C., zinc and boron oxide were brought into a liquid phase state, and the surface of the mixture was covered with boron oxide and zinc by heating for 1 hour. Next, the mixture whose surface was covered with boron oxide and zinc was cooled, 5 to 15% by mass of zinc and 5% by mass of boron oxide were further added, and the mixture was stirred to prepare a heat shield heat insulating material.

  About the produced heat insulation heat insulating material, the average particle diameter of the crystal particle of magnesium oxide powder, the average particle diameter of the heat insulation heat insulating material, the aspect ratio, and the specific surface area were measured. The average particle diameter of the magnesium oxide powder particles was measured by a powder X-ray diffraction method. The average particle diameter and the aspect ratio of the heat insulating heat insulating material were measured by an image analysis method using an electron microscope. The specific surface area of the heat insulation heat insulating material was measured by the BET method.

The average particle diameter of the crystal particles of the magnesium oxide powder was 50 μm. Moreover, the average particle diameter of the heat insulation heat insulating material was 65 μm to 100 μm, the aspect ratio was 1.1, and the specific surface area was 160 to 250 cm ² / g.

<Formation of thermal barrier and heat insulating layer by flame spraying and dip coating>
Next, 3g-9g was added to 100ml resin paint for the heat insulating heat insulating material thus prepared and stirred for 10 minutes to prepare two plate-shaped SUS304 base materials with thicknesses of 0.9mm and 3mm. A thermal barrier heat insulating layer was formed on the surface of the substrate by flame spraying or dip coating, respectively. The thermal spraying time was 15 minutes to 30 minutes, and the thickness of the heat shield heat insulating layer was 80 to 300 μm.

<Evaluation of thermal insulation effect>
The evaluation method of the heat-insulating and heat-insulating effect was performed by subjecting the base material on which the heat-insulating and heat-insulating layer was formed by flame spraying to radiation heating from the back surface side and the surface side, respectively, and measuring the change with time of temperature. Specifically, electrothermal evaluation was performed by measuring one point for each of the surface temperature of the substrate and the back surface with an infrared camera while radiatively heating the back surface or the front surface. The time-dependent change of the temperature radiantly heated from the back side and the time-dependent change of the radiantly heated temperature from the front side are as shown in FIGS. In the drawing, the surface having the heat insulating and heat insulating layer is described as C2′-500, and the raw substrate surface is described as SUS304. From the results shown in FIGS. 2 and 3, the surface temperature of the surface having the heat-insulating and heat-insulating layer was lower and the maximum was 50 ° C., regardless of whether it was radiantly heated from either the back side or the front side. From this, it became clear that the base material on which the heat insulation heat insulation layer was formed has a heat insulation heat insulation effect.

  As described above, a thermal barrier thermal insulation layer is formed on a substrate by flame spraying using a thermal barrier thermal insulation material composed of a mixture of metal oxides covered with zinc and boron oxide, boron oxide, and zinc. By doing so, it was found that a high thermal insulation effect can be obtained.

DESCRIPTION OF SYMBOLS 1 Thermal insulation heat insulation film, 2 Thermal insulation thermal insulation layer, 3 Thermal insulation layer, 10 Base material, 20 Boron oxide, 21 Zinc, 22 Magnesium oxide powder, 23 Silicon oxide, 30 Heat source

Claims (15)

In the heat insulation heat insulating material used for the formation of the heat insulation heat insulation film by the thermal spraying method on the surface of the metal substrate or the ceramic substrate,
A heat-insulating and heat-insulating material containing a heat-insulating and heat-insulating powder having a metal oxide surface covered with zinc and boron oxide, boron oxide, and zinc.   The heat-insulating heat insulating material according to claim 1, wherein the metal oxide is a mixture of magnesium oxide powder and silicon oxide, or a fired body of magnesium oxide powder and silicon oxide powder.   2. The average particle diameter of the metal oxide is 1 μm to 30 μm when the heat-insulating and heat insulating material is used for automobiles, and 30 μm to 100 μm when used for construction, substation equipment, or thermal equipment. Or the heat insulation heat insulating material of 2. In the method of manufacturing a heat insulating heat insulating material used for forming a heat insulating heat insulating film by a thermal spraying method on the surface of a metal substrate or a ceramic substrate,
Heat shield manufactured by adding boron oxide and zinc to a heat shield heat insulating powder manufactured by mixing metal oxide, zinc and boron oxide and heating at a temperature equal to or higher than the melting point of zinc and boron oxide. A method of manufacturing a heat insulating material.   The method for producing a thermal barrier heat insulating material according to claim 4, wherein the metal oxide is a mixture of magnesium oxide powder and silicon oxide, or a fired body of magnesium oxide powder and silicon oxide powder. It is a heat insulating heat insulating film formed on the surface of a metal substrate or ceramic substrate,
The thermal barrier thermal insulation film has a thermal barrier thermal insulation layer,
The heat insulation heat insulation layer is a heat insulation heat insulation film in which zinc and boron oxide are interposed in a gap between metal oxides.   The heat insulation heat insulation film of Claim 6 which further has a heat insulation layer on the said heat insulation heat insulation layer.   The heat-insulating and heat-insulating coating according to claim 7, wherein the heat-insulating layer contains at least one of phenol resin, solvent-type acrylic resin, aminoalkyd resin, aqueous acrylic resin, and urethane resin.   The said heat insulation layer is a heat insulation heat insulation film of Claim 7 or 8 containing a metal oxide.   10. The heat shield according to claim 6, wherein the metal oxide is a mixture of magnesium oxide powder and silicon oxide, or a fired body of magnesium oxide powder and silicon oxide powder. 11. Thermal insulation film.   A thermal barrier heat insulating material containing a metal oxide surface covered with zinc and boron oxide, a thermal barrier heat insulating material containing boron oxide and zinc is sprayed onto the surface of a metal substrate or ceramic substrate by a thermal spraying method. A method for forming a heat-insulating and heat-insulating film, comprising forming a heat-insulating and heat-insulating film having a heat-insulating and heat-insulating layer.   The method for forming a thermal barrier thermal insulation film according to claim 11, wherein the thermal barrier layer is formed on the thermal barrier thermal insulation layer by a dip coating method.   The said heat insulation layer is a formation method of the heat insulation heat insulation film of Claim 12 containing any 1 or more types of resin of a phenol resin, a solvent-type acrylic resin, an amino alkyd resin, a water-based acrylic resin, and a urethane resin.   The method for forming a thermal barrier thermal insulation film according to claim 13, wherein the thermal barrier layer contains a metal oxide.   15. The heat shield according to claim 11, wherein the metal oxide is a mixture of magnesium oxide powder and silicon oxide, or a fired body of magnesium oxide powder and silicon oxide powder. A method of forming a heat insulation film.

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