JP2009150636A - High efficiency heat exchanger and air conditioner including it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high efficiency heat exchanger improving heat exchange efficiency of a heat exchanger, and for carrying out heat dissipation to the outside world at a more higher temperature. <P>SOLUTION: In the heat exchanger 100, a radiation fin 30 is contacted to a heat transfer pipe 10 carrying a coolant to carry out heat exchange. A thermal conduction-dissipation coating film 20 having a property having both high thermal conductivity and dissipation is applied to a surface of the radiation fin 30, and the heat exchange efficiency with the coolant is improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a high-efficiency heat exchanger that exchanges heat with a refrigerant with high efficiency. Also, a compressor, an outdoor heat exchanger provided with a heat exchanger having a large number of radiating fins, a decompression device, and an indoor heat exchanger provided with a heat exchanger having a large number of radiating fins are respectively connected by piping. The present invention relates to a technical field of an air conditioner that is connected in an annular shape to constitute a refrigeration cycle. Applicable to air-conditioning equipment that only uses cooling and air-conditioning equipment that is also used for both air conditioning and heating. It can also be applied to a variety of equipment and products that use the refrigeration cycle to heat and cool, such as household, commercial, car air conditioners, and refrigerators. Regarding technology.

  It is said that power consumption related to the air conditioner is large among power consumption in urban areas. The development of energy-saving air-conditioning equipment is being sharpened. As a problem in the current air conditioner, there is an improvement in heat exchange efficiency in the outdoor heat exchanger and the indoor heat exchanger along with power saving of the compressor. By improving the heat exchange efficiency in the outdoor heat exchanger and the indoor heat exchanger, the electric energy input to the refrigeration cycle can be reduced.

Hereinafter, an example of indoor cooling will be described.
In a conventional air conditioner, the refrigerant is converted into a high-temperature and high-pressure gas state by the compressor, and the heat of the refrigerant is deprived in the heat exchanger in the outdoor heat exchanger (called “condenser” or “evaporator” in the case of indoor cooling). Then, heat is radiated to the outside and the refrigerant is in a liquid state. For example, when the refrigerant becomes a high temperature gas of about 80 ° C. and the outdoor temperature is about 40 ° C., the air exhausted from the heat exchanger (condenser) in the outdoor heat exchanger is about 50 ° C. to 60 ° C. The refrigerant that has passed through the heat exchanger (condenser) in the outdoor heat exchanger is supposed to be about 50 ° C.

  In a heat exchanger in a conventional outdoor heat exchanger, as a means for improving the efficiency of taking heat away from the received refrigerant and radiating it to the outside, for example, a plurality of thin aluminum sheets are provided as radiating fins, and the refrigerant passes. The tubules with finely branched tubes and the area where the refrigerant touches the outside air are made as large as possible to improve heat dissipation. If the heat radiation efficiency of the heat radiation fins is increased, the heat exchange efficiency in the outdoor heat exchanger will be improved.

  The improvement of the heat dissipation efficiency of the conventional heat sink fins promotes heat exchange between the refrigerant and the outside air by using a metal with high thermal conductivity as the material of the heat sink fins and making the area of the heat sink fins as large as possible. It was a thing. In other words, in the heat exchanger of the prior art, by using a metal having high thermal conductivity such as aluminum for the radiating fin, heat is quickly diffused from the pipe through which the refrigerant passes to the entire radiating fin, and the outside area has a total area of the radiating fin. Therefore, the heat exchange efficiency between the refrigerant and the outside air is improved.

In general, outdoor heat exchangers used in the prior art and heat-radiating fins used in indoor heat exchangers have a sheet-like shape in which each sheet is made of a thin metal with high thermal conductivity such as aluminum. The sheet-like radiating fins have a structure in which a large number of sheets are arranged with a predetermined interval (for example, 2 mm to 3 mm).
In the prior art, there are the following techniques for improving the heat exchange efficiency of the radiating fins.

  For example, in Japanese Patent Application Laid-Open No. 08-320192, in a heat exchanger that performs heat exchange by bringing heat transfer fins into contact with a heat transfer tube, a plurality of the heat transfer tubes arranged at intervals and a plurality of the heat transfer tubes are spiraled. A heat transfer fin constituted by a thin wire wound in a shape is disclosed. That is, the metal wire made of a metal having high thermal conductivity is provided in a spiral shape (mesh shape) with respect to the thin tube through which the refrigerant passes. The technique disclosed in Japanese Patent Application Laid-Open No. 08-320192 can be evaluated even if it aims to increase the gap through which air flows rather than increasing the surface area of the metal used for heat exchange.

  Further, for example, Japanese Patent Application Laid-Open No. 06-11210 discloses a condenser in which wavy fins are provided so as to advance in the vertical direction between the narrow tubes with respect to the thin tubes through which the refrigerant passes in the vertical direction. Has been. In other words, aiming to further increase the surface area of the radiating fins by making each radiating fin made of metal with high thermal conductivity into a corrugated rather than a flat plate with respect to the thin tube through which the refrigerant passes. It is a thing.

Japanese Patent Application Laid-Open No. 08-320192 JP-A-06-11210

  In the conventional heat exchanger, the heat exchange efficiency is improved by increasing the surface area of the radiating fins. Increasing the surface area of the radiating fins is effective as a means for improving the heat exchange efficiency of the heat exchanger.

However, in the prior art, there is still room for improving the heat exchange efficiency of the heat exchanger.
In the above prior art, for example, when the outdoor temperature is about 40 ° C., the refrigerant passing through the heat exchanger (condenser) is a high-temperature gas of about 80 ° C. before passing through the heat exchanger (condenser). ), The liquid is about 50 ° C., and the air exhausted from the heat exchanger is about 50 ° C. to 60 ° C. If the heat exchange efficiency of the heat exchanger is improved and heat can be radiated at a temperature close to the refrigerant temperature (for example, 80 ° C.) before passing through the heat exchanger, power saving of the device can be realized.

  In addition, the heat dissipating fins of heat exchangers in the prior art are usually made of an aluminum base. However, in order to emphasize heat dissipating efficiency, the thickness of the aluminum heat dissipating fins was very thin, about 0.1 mm, which caused corrosion. Weak and easily corroded. In the conventional technology, a technology to coat the surface of the epoxy resin was used to cope with this corrosion. However, since the epoxy resin is sensitive to ultraviolet rays, it is applicable to the heat radiation fins used in heat exchangers used in outdoor units. I couldn't. In addition, the epoxy resin is hydrophobic and water droplets are formed, which fills the gaps between the heat dissipation fins and hinders the flow of air to carry heat out of the system, resulting in a decrease in heat dissipation efficiency. There was a problem of inviting.

In view of the above problems, an object of the present invention is to provide a high-efficiency heat exchanger that can improve the heat exchange efficiency of a heat exchanger and dissipate heat to the outside at a higher temperature.
Another object of the present invention is to provide an air conditioner including a high-efficiency heat exchanger that realizes power saving by applying a high-efficiency heat exchanger having high heat exchange efficiency.

  In order to achieve the above object, the high-efficiency heat exchanger of the present invention is a heat exchanger that performs heat exchange by bringing a radiation fin into contact with a heat transfer tube through which a refrigerant passes, and has high thermal conductivity on the surface of the radiation fin. The present invention is characterized in that a heat conducting / heat dissipating coating film having a property that also has heat dissipating properties is applied to improve heat exchange efficiency with the refrigerant.

  With the above configuration, heat dissipation from the heat radiating fins of the heat exchanger can be improved and heat can be efficiently radiated to the outside. In this way, the concept of improving the thermal efficiency of heat dissipation fins by applying a heat conductive and heat dissipation coating film having the properties of both high thermal conductivity and high heat dissipation to the heat dissipation fins of the heat exchanger is There is no breakthrough technology.

An air conditioner including a high-efficiency heat exchanger according to the present invention includes a compressor, an outdoor heat exchanger including a heat exchanger having a large number of heat radiation fins, a decompression device, and a large number of heat radiation fins. In the air conditioner in which the refrigeration cycle is configured by connecting the indoor heat exchanger provided with the heat exchanger in a ring shape with pipes, the surface of the radiating fin of the heat exchanger of the outdoor heat exchanger has high heat. It is characterized in that a heat conductive / heat dissipating coating film having properties having both conductivity and heat dissipation is applied to efficiently dissipate heat of the refrigerant to the outside of the room.
In the above-described configuration, it is also preferable to apply the heat conductive / heat dissipating coating film also to the compressor surface, and to efficiently dissipate heat generated by the compressor to the outside of the room.

  By the said structure, the heat dissipation of the heat radiation fin of the heat exchanger of an air conditioning apparatus or a compressor can be improved, and it can thermally radiate efficiently with respect to the external environment. In this way, the heat dissipation fins of the heat exchanger of the air conditioner are coated with a heat conductive and heat dissipation coating film that has both high heat conductivity and high heat dissipation properties to improve the heat efficiency of the heat dissipation fins and the compressor. The concept to make is an epoch-making technology not found in the prior art.

The present invention can also be applied to an air conditioning apparatus that is also used for air conditioning.
In addition to the configuration of the air conditioner including the high-efficiency heat exchanger, a four-way valve that changes the gas flow during heating operation and cooling operation is provided, and the heat is also applied to the surface of the radiating fin of the indoor heat exchanger. It is characterized in that a conductive / heat dissipating coating film is applied to efficiently dissipate heat of the refrigerant into the room in the indoor heating mode.

  With the above configuration, heat dissipation from the heat radiation fins of the indoor heat exchanger can be improved during heating, and heat can be efficiently radiated to the room.

  Here, the heat conductive / heat dissipating coating film is applied and dried with a binder comprising a hydrolysis reaction of a alkoxide compound and a silanol dehydration condensation reaction, a far-infrared radioactive material pigment, and a solvent. A coating film composed of a Si-O network formed by the progress of silanol dehydration condensation and a silanol group remaining after hydrolysis of the alkoxide compound, and the thermal conductivity and heat dissipation. It is preferable that these are exhibited.

  With the above configuration, since the entire Si—O network passes through the film itself, heat is efficiently transported through the Si—O network, and high thermal conductivity is obtained. Furthermore, since the inorganic pigment which is an inorganic mineral is contained and solidified, the thermal conductivity does not decrease. If the substrate is a material having good thermal conductivity, heat can quickly diffuse throughout the substrate, and heat can be released from the entire air conditioner to the outside of the system.

Further, in the above configuration, the heat radiating fin is made of an aluminum base material,
Due to the dehydration condensation between the Si—OH group contained in the alkoxide compound of the binder and the Al—OH group present on the surface of the aluminum base of the heat radiating fin, the heat conducting / heat radiating coating film is formed on the heat radiating fin. It is preferably formed as a film having a chemical bond between an aluminum base and Si—O—Al.
With the above configuration, the heat conductive / heat dissipating coating film and the aluminum base of the heat dissipating fin are firmly bonded by the Si—O—Al chemical bond, so that a very stable film is formed on the surface of the heat dissipating fin. If the aluminum base of the heat dissipation fin is left as it is, there is a risk that the heat exchange efficiency will decrease by about 30 to 40% in about 4 to 5 years due to corrosion, but this strongly stable heat conduction and heat dissipation The coating film also has the effect of improving antifouling properties and anticorrosion properties.

In addition, the component of a heat conductive and heat dissipation coating film can be made into the following.
First, as a first constitution of the binder produced by the hydrolysis reaction and silanol dehydration condensation reaction of the alkoxide compound, trialkoxysilane is added to tetraalkoxysilane, and tetraalkoxysilane: trialkoxysilane is 5 to 5 to 0. Control of the formation progress of the Si-O network material present in the paint produced by the silanol dehydration condensation after hydrolysis of the alkoxide compound and the residual amount of silanol groups by blending at a ratio of 10 to 10. Is preferred.

  Next, as a second constitution of the binder produced by the hydrolysis reaction and silanol dehydration condensation reaction of the alkoxide compound, trialkoxysilane and dialkoxysilane are converted to tetraalkoxysilane: trialkoxysilane: trialkoxysilane: Si-O present in a paint produced by silanol dehydration condensation after hydrolysis of the alkoxide compound, in which dialkoxysilane is blended in a ratio of 4.5 to 4.5 to 1 to 7.2 to 1.8 to 1. What controlled the formation progress of the network material and the residual amount of the silanol group is preferable.

  With the above coating for heat conduction and heat dissipation coating film, it is possible to control the formation of tough Si-O network material present in the paint and the residual amount of silanol groups, heat dissipation, heat resistance, Strong adhesion and toughness can be obtained at the same time. Further, by forming the Si—O network material to some extent, the shrinkage rate in the process of forming the film is reduced, the residual stress is reduced, and the adhesion to the substrate is improved.

Here, use of the high-efficiency heat exchanger of the present invention or a binder for a heat conductive / heat dissipating coating film of an air conditioner including the same, which has been sufficiently aged in molecular growth before application. Is preferred.
With the above-described configuration, the coating film can be stable with respect to the coating environment and has high workability, and a stable heat conduction / heat radiation coating film can be obtained in each radiation fin of the heat exchanger.

Furthermore, a reactive modified organosiloxane having an amino group, an epoxy group, an acrylic group or the like is added to the binder of the coating for heat conduction / heat radiation coating film of the high efficiency heat exchanger of the present invention or an air conditioner including the heat exchanger. Is preferred.
With the above configuration, the heat conduction / heat dissipating coating film of each heat dissipating fin of the heat exchanger can be obtained by drying at room temperature, and the workability of manufacturing is improved.

  Here, examples of reactive modified organosiloxane include amino groups (aminoethyl-aminopropyltrimethoxysilane, aminoethyl-aminopropyltriethoxysilane, aminoethyl-aminopropylmethylmethoxysilane, aminoethyl-aminopropylmethylethoxysilane). , Aminopropyltrimethoxysilane, aminopropyltriethoxysilane), epoxy group (gridoxypropyltrimethoxysilane, gridoxypropyltriethoxysilane, gridoxypropylmethylmethoxysilane, gridoxypropylmethylethoxysilane), acrylic group (methacrylic) Roxypropyltrimethoxysilane, methacryloxypropyltriethoxysilane, methacryloxypropylmethylmethoxysilane, methacryloxypropylmethylethoxysilane Run).

  Next, as the first composition of the pigment in the coating material forming the heat conductive / heat dissipating coating film, silica (SiO2), cordierite and silica (SiO2), cordierite and alumina (Al2O3), cordierite and silica ( It is preferable to contain any of the compounds of SiO2) and alumina (Al2O3).

In addition to the first pigment, the second composition of the pigment in the coating material forming the heat conductive / heat dissipating coating film includes iron oxide (FeO, Fe2O3, Fe3O4), manganese dioxide (MnO2), cobalt oxide ( CoO), cobalt trioxide (Co2O3), copper oxide (I) (Cu2O), copper oxide (II) (CuO), nickel oxide (NiO), zirconium oxide (ZrO2), or any of those compounds Is preferred.
By the coating material for heat conductive and heat radiating coating film, it is possible to obtain an efficient conversion from a high temperature region to a low temperature region in the far infrared radiation wavelength region with these pigments.

Moreover, it is preferable that the pigment in the coating material for forming the heat conducting / radiating coating film contains titanium oxide.
Further, it is preferable that the far-infrared radioactive substance pigment is coated around the titanium oxide particles.

  Here, the titanium oxide is preferably an anatase type having high activity. Since the antifouling property is improved by the photocatalytic action, the heat exchange efficiency is not lowered due to the corrosion of the radiation fins. When titanium oxide is included in the pigment, titanium oxide appears on the surface area of the heat conducting and heat radiating coating film, so the proportion of far-infrared radiation pigment that appears on the surface area decreases. Further, coating with a compound of a far-infrared radiation pigment ensures antifouling properties and does not reduce the emissivity.

  Next, the solvent is preferably an alcohol having a boiling point higher than room temperature, and the porous structure is preferably formed by volatilizing the solvent during the formation of the heat conducting / heat dissipating coating film.

  By making a porous structure in the film as described above, it is possible to obtain further superior toughness as the whole film.

The high efficiency heat exchanger and the air conditioner including the high efficiency heat exchanger of the present invention can be applied to various products.
For example, a domestic air conditioner to which an air conditioner including the high efficiency heat exchanger of the present invention is applied can be provided.
For example, it is possible to provide a commercial air conditioner to which an air conditioner including the high efficiency heat exchanger of the present invention is applied.
For example, a car air conditioner to which an air conditioner including the high efficiency heat exchanger of the present invention is applied can be provided.
For example, the refrigerator which applied the air conditioning apparatus containing the high efficiency heat exchanger of this invention can be provided.

According to the high-efficiency heat exchanger of the present invention, the heat dissipation is improved by the functional film called the heat conduction / heat dissipation coating film applied to the heat dissipation fin of the heat exchanger, and the heat is efficiently dissipated to the outside of the system. be able to.
In addition, according to the air conditioner including the high efficiency heat exchanger of the present invention, the heat dissipation is improved by the functional film called the heat conduction / heat dissipation coating film applied to the heat dissipation fin of the heat exchanger, It is possible to efficiently dissipate heat.
The air conditioner including the high-efficiency heat exchanger of the present invention can be applied even to an air conditioner that is also used as an air conditioning unit.
In addition, since the Si—O network is entirely passed through the heat conduction / heat dissipation coating film, heat is efficiently transported through the Si—O network, and high heat conductivity is obtained. Furthermore, since the inorganic pigment which is an inorganic mineral is contained and solidified, the thermal conductivity does not decrease.
In addition, by devising the composition of the alkoxide binder, it is possible to control the formation of tough Si-O network material present in the paint and the residual amount of silanol groups, heat dissipation, heat resistance, to the substrate Strong adhesion and toughness can be obtained at the same time. Further, by forming the Si—O network material to a certain extent, the shrinkage rate in the process of forming the film is reduced, the residual stress is reduced, and the adhesion to the substrate is improved.

  Embodiments of an air conditioner and a method for forming the same according to the present invention will be described below with reference to the drawings. However, it goes without saying that the scope of the present invention is not limited to the specific application, shape, number, etc. shown in the following examples.

The example of the highly efficient heat exchanger of this invention concerning Example 1 is shown.
FIG. 1 is a diagram schematically showing a configuration example of a high-efficiency heat exchanger 100 of the present invention.
In the configuration example of FIG. 1, the radiation fins 30 of the high-efficiency heat exchanger 100 have a thin sheet shape, and the left is a side view of the high-efficiency heat exchanger 100 when the radiation fins 30 are viewed horizontally. Shows a plan view of the high-efficiency heat exchanger 100 when the radiating fins are viewed in a plane.
A large number of heat transfer tubes 10 through which the refrigerant passes pass through the radiating fins 30, and the heat of the refrigerant is transmitted from the heat transfer tubes 10 to the radiating fins 30, and heat is released from the radiating fins 30 to the outside of the system.

  The heat transfer tube 10 is made of a metal material having a high thermal conductivity, such as copper, and provides a heat conduction path 12 that conducts the heat of the refrigerant.

  The heat radiating fins 30 are made of a metal material having a high thermal conductivity, such as aluminum, and are provided on the heat transfer tube 10 in large numbers. The shape of the heat radiation fin 30 is not particularly limited, and for example, there is a plate shape or a sheet shape.

The heat-conductive / heat-dissipating coating film 20 having the property of having both high heat conductivity and heat dissipation is applied to the surface of the high-efficiency heat exchanger 100 of the present invention to improve the heat exchange efficiency with the refrigerant. It has become.
In this configuration example, the heat conduction / heat radiation coating film 20 is formed on the entire surface of the heat radiation fin 30.
The composition of the heat conduction / heat dissipation coating film 20 will be described in detail later.

In the high-efficiency heat exchanger 100 having the above configuration, heat is radiated as follows.
The heat of the refrigerant is transmitted from the heat receiving surface of the heat transfer tube 10 to the heat transfer tube 10 and further transferred to the heat radiating fins 30. Heat is conducted to the heat conducting / heat dissipating coating film 20 applied to the surface of the radiation fin 30. The heat radiation fin 30 and the heat conduction / heat radiation coating film 20 have high heat conductivity and heat diffuses quickly.
Since the heat conductive / heat radiating coating film 20 has high heat radiating properties as will be described later, the heat conductive / heat radiating coating film 20 is discharged out of the system from the entire surface of the heat conductive / heat radiating coating film 20.
FIG. 1C schematically shows the state of heat radiation from the heat conduction / heat radiation coating film 20.
Thus, the high-efficiency heat exchanger 100 of the present invention has a mechanism that can efficiently release heat to the outside of the system.

Next, the air conditioning apparatus 200 including the above-described high efficiency heat exchanger will be described.
FIG. 2 is a diagram schematically illustrating a configuration example of an air-conditioning apparatus 200 including the high-efficiency heat exchanger according to the present invention.

  As shown in FIG. 2, the compressor 210, the outdoor heat exchanger 220 including the heat exchanger 100 having a large number of heat radiation fins 30, the decompression device 230, and the heat exchanger 100 having a large number of heat radiation fins 30 are provided. The indoor heat exchanger 240 provided is connected to each other in a ring shape to form an air conditioner that constitutes a refrigeration cycle. Here, the surface of the heat radiation fin 30 of the outdoor heat exchanger 220 heat exchanger 100 is coated with a heat conducting / heat dissipating coating film 20, which makes it possible to efficiently dissipate the heat of the refrigerant to the outdoors. ing.

In addition, the structure which coat | covers the heat conductive and heat-radiation coating film 20 also on the compressor 210 surface is also possible, and the heat radiating to the outdoor of the heat generated in the compressor 210 is made efficient, and a high-efficiency heat exchanger is installed. The heat dissipation efficiency of the air conditioning apparatus 200 that is included is also improved.
If the air conditioner is compatible with air conditioning, it is equipped with a four-way valve that changes the gas flow during heating operation and cooling operation, and heat conduction / radiation is also applied to the surface of the heat radiation fin of the heat exchanger of the indoor heat exchanger 240. If the conductive coating film 20 is applied, the efficiency of heat release from the heat of the refrigerant into the room is increased in the indoor heating mode.

Next, the heat conduction / heat dissipation coating film 20 will be described in detail.
The coating material for the heat conductive / heat radiating coating film 20 uses a binder produced by a hydrolysis reaction and silanol dehydration condensation reaction of an alkoxide compound. In the binder, silanol groups are first generated by hydrolysis of the alkoxide compound, and then a silanol dehydration condensation reaction proceeds to form a Si-O network. Thermal conductivity and heat dissipation are exhibited by the coating composed of the Si—O network formed by the progress of the silanol dehydration condensation and the remaining silanol groups. In addition, since the pigment contains a high-efficiency thermal radioactive substance, the heat dissipation by the pigment is also exhibited.

  Although it is better to accelerate the hydrolysis of the alkoxide, it is necessary to pay attention to the possibility that the dehydration condensation of silanol proceeds excessively thereafter. If the dehydration condensation of silanol proceeds too much in the paint state, a large number of Si-O networks are formed before coating, and the coating film formed by drying after coating becomes brittle or easily cracks. It is because the problem that adhesive force will become small generate | occur | produces.

  On the other hand, when the dehydration condensation reaction of silanol is not sufficient, that is, in the state of silanol rich in the paint state, many dehydration condensation proceeds in the process of forming a film after coating, and the dehydration condensation proceeds. The film shrinks and the shrinkage rate increases, causing a problem that the applied film is peeled off.

  From the above, the coating material forming the heat conductive / heat dissipating coating film 20 is produced by dehydration condensation by completely terminating the hydrolysis of the alkoxide and suppressing the dehydration condensation reaction after the silanol dehydration condensation reaction has proceeded by an appropriate amount. It is preferable to control the formation progress of the Si—O network material present in the paint and the residual amount of silanol groups. Accordingly, an appropriate amount of Si—O network material is formed before coating, and the amount of Si—O network newly formed by dehydration condensation after coating is reduced to prevent the shrinkage rate from increasing, and the remaining Si The adhesion to the substrate is ensured by the —OH group.

An example of the composition of the binder will be described.
The binder composition of the 1st coating material for heat conductive and heat radiating coating films is a mixture of tetraalkoxysilane and trialkoxysilane in a predetermined ratio as a binder made of an alkoxide compound.
The mixing ratio of tetraalkoxysilane: trialkoxysilane is preferably 5: 5 to 0:10.
The binder composition of the second coating material for heat conductive and heat radiating coating film is a mixture of tetraalkoxysilane, trialkoxysilane, and dialkoxysilane in a predetermined ratio as a binder made of an alkoxide compound.
The mixing ratio of tetraalkoxysilane: trialkoxysilane: dialkoxysilane is preferably 4.5 to 4.5 to 1 to 7.2 to 1.8 to 1.

Examples of the tetraalkoxysilane having four Si—OH functional groups include tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, and tetrabutoxysilane.
Trialkoxysilanes having three Si-OH functional groups include trimethylmethoxysilane, trimethylethoxysilane, triethylmethoxysilane, triethylethoxysilane, triphenylmethoxysilane, triphenylethoxysilane, trimethylpropoxysilane, triethylpropoxysilane, etc. Is mentioned.
Examples of dialkoxysilane having two Si—OH functional groups include dityldimethoxysilane, dimethyldiethoxysilane, diethyldimethoxysilane, and diethyldiethoxysilane.

  These are used in combination as an alkoxide compound. Preferred in combination is dimethylmethoxysilane, trimethylmethoxysilane and tetramethoxysilane, or dimethylethoxysilane, trimethylethoxysilane and tetraethoxysilane.

In the present invention, the formation progress of the Si-O network material present in the paint produced by dehydration condensation after hydrolysis of the alkoxide compound and the residual amount of silanol groups are controlled, and the heat conduction / heat dissipation coating film 20 is formed. Ensure thermal conductivity and heat dissipation.
Next, it will be explained that the heat conductive / heat dissipating coating film 20 of the present invention has both heat conductivity and heat dissipation.

The principle of controlling the formation progress of the Si—O network material and the control of the remaining amount of silanol groups is as follows.
Alkoxide compounds generate silanol groups (Si-OH functional groups) by hydrolysis, and the formation of Si-O networks proceeds by dehydration condensation of the Si-OH functional groups. Since tetraalkoxysilane having four Si—OH functional groups has many Si—OH functional groups, if the dehydration condensation is promoted, the formation of the Si—O network proceeds quickly and gels early. When the binder is formed only with tetraalkoxysilane, the Si—OH functional group is almost completely consumed, and the Si—O network is formed. Since trialkoxysilane having three Si—OH functional groups also has Si—OH functional groups, if dehydration condensation is promoted, formation of Si—O network proceeds and gelation occurs. When the binder is formed only with trialkoxysilane, the presence of Si—OH functional groups between the particles becomes uniform, so that the Si—O network is formed with the Si—OH functional groups being almost completely consumed.

  Since the dialkoxysilane having two Si—OH functional groups also has the Si—OH functional group, if the dehydration condensation is promoted, the formation of the Si—O network proceeds and gelation occurs. When the binder is formed only from dialkoxysilane, the formation of the Si—O network is formed with the Si—OH functional group being almost completely consumed. However, dialkoxysilane has only two Si—OH functional groups, and a Si—O network is formed in a linear form by dehydration condensation, resulting in reduced robustness.

In the present invention, not only the formation of a robust film by the Si—O network is aimed, but also the formation of the Si—O network is advanced while the Si—OH functional group is controlled to remain without being consumed. The remaining Si—OH functional groups provide strong adhesion to the substrate due to the binding energy between the OH groups of the substrate such as a metal plate.
That is, when an alkoxide compound having two Si-OH functional groups, an alkoxide compound having three Si-OH functional groups, and an alkoxide compound having four Si-OH functional groups are mixed at a predetermined ratio, the alkoxide molecules are Since there is an imbalance in the number of Si-OH functional groups, there is no Si-OH functional group to react with, and so many floating Si-OH functional groups appear, so dehydration condensation does not proceed at a stretch.

  However, if left for a long period of time, the dehydration condensation reaction between floating Si—OH proceeds, so the amount of the remaining Si—OH functional groups gradually decreases. If the ratio of the compound, trifunctional alkoxide compound, and tetrafunctional alkoxide compound is adjusted, dehydration condensation proceeds at an early stage, but after the number of Si-OH functional groups falls into an unbalanced state, dehydration condensation rapidly occurs. The brake will be applied.

  As will be described later, the blending ratio of a bifunctional alkoxide compound, a trifunctional alkoxide compound, and a tetrafunctional alkoxide compound was repeatedly tested for blending to form a film having good adhesion, thermal conductivity, and heat dissipation. I found.

  Here, it is preferable to ripen sufficient molecular growth by silanol reaction after hydrolysis of the alkoxide binder in the liquid before coating in the binder. This is because, by sufficiently aging and obtaining an appropriate amount of Si—O network, the coating environment is stable and highly workable, and the paint becomes more stable as a one-part solution.

In the present invention, since the radiating fin is an aluminum base, Si—O—Al chemical bond is also used so that the heat conducting / heat radiating coating film 20 is firmly bonded to the aluminum base. As described above, when the radiating fin 30 is made of an aluminum substrate, the Si—OH group contained in the alkoxide compound of the binder and the Al—OH group present on the surface of the aluminum substrate of the radiating fin 30 are dehydrated. Condensation can occur. By this dehydration condensation reaction, a strong chemical bond of Si—O—Al is generated between the heat conducting / heat radiating coating film 20 and the aluminum base material of the heat radiating fin 30. For this reason, the heat radiation fin 30 of the high efficiency heat exchanger 100 of the present invention is in a state where the extremely strong and stable heat conduction / heat radiation coating film 20 is coated.
Thus, by the coating of the coating film 20 that is extremely strong and stable, the high-efficiency heat exchanger 100 of the present invention can not only obtain high heat conduction and heat dissipation efficiency, but also a thin aluminum plate that is easily corroded. It is also possible to obtain the antifouling property and anticorrosion property of the radiating fin.

Next, as another contrivance for the binder, there is a contrivance that is suitable for drying at room temperature by adding a reactive modified organosiloxane having an amino group, an epoxy group, an acrylic group or the like to the binder.
For example, examples of reactive modified organosiloxanes include amino groups (aminoethyl-aminopropyltrimethoxysilane, aminoethyl-aminopropyltriethoxysilane, aminoethyl-aminopropylmethylmethoxysilane, aminoethyl-aminopropylmethylethoxysilane, Aminopropyltrimethoxysilane, aminopropyltriethoxysilane), epoxy group (gridoxypropyltrimethoxysilane, gridoxypropyltriethoxysilane, gridoxypropylmethylmethoxysilane, gridoxypropylmethylethoxysilane), acrylic group (methacryloxy) Propyltrimethoxysilane, methacryloxypropyltriethoxysilane, methacryloxypropylmethylmethoxysilane, methacryloxypropylmethylethoxy Silane).

With respect to the heat conduction / heat dissipation coating film 20 formed using the paint for the heat conduction / heat dissipation coating film adjusted to the above components, a paint was actually formed, and various performance experiments were conducted.
First, an adhesion test of the heat conduction / heat dissipating coating film 20 is performed, and an experiment is performed on the condition that the heat conduction / heat dissipating coating film 20 is stably attached on the substrate. The heat conductivity / heat dissipation coating film 20 is verified to have good heat conductivity and heat dissipation.

[Adhesion experiment]
Binder composition of coating material for heat conduction / heat dissipation coating film used in adhesion experiment The binder composition of coating material for heat conduction / heat radiation coating film used in the experiment was manufactured by Momentive Materials as tetraalkoxysilane with four functional groups. Tetramethoxysilane was used. Further, trimethylmethoxysilane manufactured by Momentive Materials was used as a trialkoxysilane serving as a binder having a trifunctional group. Moreover, the dimethyl methoxysilane by Momentive Material company was used as dimethoxysilane provided with 2 functional groups. Tetramethoxysilane, trimethylmethoxysilane, and dimethylmethoxysilane were mixed and manufactured.

The amount of water used for the hydrolysis was 0.8 to 1.4 mol of water with respect to 1 mol of the alkoxide compound. When water is 0.8 mol or less, generation of Si—OH groups is not sufficient and the film hardness is not increased, and when it is 1.4 mol or more, Si—OH groups increase, silanol molecular bonds increase, and gelation occurs. This is because it progresses and cracks are likely to occur. The amount of acid used as the catalyst was sufficient to cause hydrolysis in both cases of organic acid and inorganic acid.
The composition of dimethylmethoxysilane (bifunctional), trimethylmethoxysilane (trifunctional), and tetramethoxysilane (tetrafunctional) contained in each sample is shown in [Table 1].

-Base material for forming a heat conductive / heat radiating coating film An aluminum plate subjected to blasting treatment was used.

-Adhesion experiment method The adhesion experiment was conducted by a cross-cut test by the method of JIS-K5600-5-6. The experiment was performed three times. [Table 2] shows the result of adhesion experiment on the blasted aluminum plate.

Note 1: Other alkoxides include an ethoxy group and a phenyl group, but the ethoxy group is omitted because it is different in reaction speed from the methoxy group, and phenyl is omitted because it is inferior in hardness.
Note 2: The reaction is carried out with 2.5 to 4.5 moles of water, preferably 3.3 moles of water per mole of alkoxide, a sufficient amount of acid, a pigment ratio of 70%, and a film thickness of 25μ ± 3μ. .
Note 3: The dispersion solvent used was a mixture of ethanol and isopropyl alcohol.
Note 4: 0.7 mm glass beads were used for dispersion. The particle size after dispersion is 0.35 microns at D50.
Note 5: The firing conditions are 20 minutes at 180 ° C. The substrate was an aluminum plate made only of alcohol degreasing. Three test pieces each of 7.5 mmw × 15.0 mm × 1.0 mmt. (Evaluation is all clear)
Note 6: Application method is spray coating.
Note 7: Film thickness is 15-20μ, measurement method is micrometer.

  From the above-mentioned adhesion experiment, it was proved that the mixing ratio of the blending 1 to the blending 2 was good from the experimental results of the blending 1 to the blending 3 which is a binder obtained by mixing tetraalkoxysilane and trialkoxysilane. That is, a ratio of tetraalkoxysilane: trialkoxysilane of 5: 5 to 0:10 is preferable.

  Moreover, from the above-mentioned adhesion experiment, the mixing ratio is that the mixing ratio of the blending 4 to the blending 5 is good from the experimental results of the blending 4 to the blending 9 which are binders in which tetraalkoxysilane, trialkoxysilane and dialkoxysilane are mixed. I was able to prove. That is, if the ratio of trifunctional groups is reduced as in Formulation 6, the adhesiveness is inferior, and even if the proportion of bifunctional groups is increased as in Formulation 7 to Formulation 9, the adhesion is inferior. That is, the ratio of tetraalkoxysilane: trialkoxysilane: dialkoxysilane is preferably 4.5 to 4.5 to 1 to 7.2 to 1.8 to 1.

  As described above, if the composition of the binder of the coating material for the heat conductive / heat dissipating coating film 20 of the present invention is devised so as to have the above ratio, the adhesion of the heat conductive / heat dissipating coating film 20 is increased. The amount of —O network and remaining Si—OH groups can be controlled.

[Thermal conductivity test]
It was confirmed that a high thermal conductivity was obtained in the heat conduction / heat dissipation coating film 20.
-Binder composition of the paint used for the heat conduction test The binder composition of the paint for the heat conduction / heat dissipation coating film 20 was the same as the binder composition of the paint used in the adhesion experiment.

-Substrate on which the heat conductive / heat dissipating coating film 20 is formed An aluminum plate (150 mm x 75 mm x 1.0 mm) subjected to aluminum blasting was used.
-Thermal conductivity test method The heat conductive / heat dissipating coating film 20 is formed on half of the aluminum plate, and the other half is not formed with the heat conductive / heat dissipating coating film 20 but the aluminum plate is left exposed. It heated from the back surface of the aluminum plate, and measured the temperature distribution on the surface of the aluminum plate.

  In the heat conductive / heat dissipating coating film 20 of the present invention, since the Si—O network is entirely passed through the entire film, the heat conductivity is high, and it is an inorganic mineral such as cordierite, alumina, silica, zirconia regardless of the porous structure. Thermal conductivity is high because it contains an inorganic pigment and is solidified. When the thermal conductivity was actually measured using the sample piece of the thermal conductive / heat radiating coating film 2, a thermal conductivity of 2 W / mK or more was obtained.

[Heat dissipation test]
Next, the function as a heat dissipation film, that is, the conversion efficiency of thermal energy received from the heating element into far-infrared energy will be verified. In the paint for a heat conductive / heat dissipating coating film of the present invention, the contained pigment provides a far infrared radiation function in the formed film. Therefore, the pigment formulation is important.
In order to realize a high thermal emissivity, it is necessary to have an emission spectrum that is close to 100% in emissivity over the entire range of the heat ray wavelength region, and that the radiance is close to black body radiation at the temperature.

  As the first pigment, any one of silica (SiO2), magnesia (MgO2), cordierite and silica (SiO2), cordierite and alumina (Al2O3), cordierite and silica (SiO2) and alumina (Al2O3) is used. Shall be included. These have high thermal diffusivity and heat dissipation, and have a thermal expansion coefficient of 5 × 10 −6 to 10.5 × 10 −6 and are relatively large. In addition, the film behaves similarly to that of a metal. Therefore, no tensile stress is generated in the film, and stable heat dissipation is obtained even in a high temperature range. In addition, electroconductivity can be easily obtained by adding a certain amount or more of carbon. In particular, it is possible to use a carbon sheet heating element that has been conventionally impossible in the atmosphere up to 450 ° C., in a high-temperature vacuum furnace, or in an atmosphere furnace such as an inert gas.

  The idea of adding the following second pigment to the first pigment is also preferable. The second pigment is iron oxide (FeO, Fe2O3, Fe3O4), manganese dioxide (MnO2), cobalt oxide (CoO), cobalt trioxide (Co2O3), copper oxide (I) (Cu2O), copper oxide (II) ( CuO), nickel oxide (NiO), zirconium oxide (ZrO2), or any of these compounds.

The pigment particle size is preferably 0.5 μm or less in terms of the average particle size after solvent dispersion in consideration of the smoothness, tightness and strength of the film.
An appropriate ratio of alkoxide to pigment is 15 to 45% by volume. If it is 15% or less, the toughness of the film is lowered and the fastness is lost. If it exceeds 45%, the amount of drying shrinkage due to dehydration condensation is large, cracks are likely to occur at high temperatures, and it is difficult to obtain the desired heat dissipation.

  As for the thickness of the film, even if the base material or the heating element and the film are firmly attached and the difference in thermal expansion between them is very close, if the film becomes too thick, cracks occur. This is due to the shrinkage phenomenon that occurs when Si—OH undergoes dehydration condensation. The film thickness is preferably 30 μm or less, although it depends on the binder content. In particular, in order to prevent cracks from occurring at 800 ° C. when the proportion of all solids of dehydration condensate of alkoxide compound (that is, the total of inorganic pigment components when mixed with SiO 2 generated from Si—OH) is 45% by volume, About 10μ is preferable. When the film thickness exceeds 30 μm, the film becomes brittle and cannot be used for a long time. Therefore, the ratio of the dehydration condensate of the alkoxide compound is desirably 30% by volume or less.

As a sample, a heat conductive / heat dissipating coating film coating material 2 containing a pigment as shown in [Table 3] was prepared, and a far infrared radiation experiment was conducted.
The baking conditions were baking at 180 ° C. for 20 minutes.
Film thicknesses of 20 μm to 26 μm were baked by micrometer measurement.
The measurement was conducted by the Far Infrared Applied Research Group.
The measurement temperature was 60 ° C.
JIR-E500 was used as a measurement model.
The measurement conditions are a resolution of 16 cm −1 and an integration count of 200. The detector is MCT.

  Of the first pigments of the present invention, silica (SiO 2), magnesia (MgO 2), alumina (Al 2 O 3), and magnesia (MgO 2), silica (SiO 2) and alumina (Al 2 O 3) are used in the heat conduction / heat dissipation coating film 2. And magnesia (MgO2). Titanium oxide was blended as a pigment that gives antifouling and anticorrosive properties due to photocatalytic reactions. As the binder, trimethylmethoxysilane having a trifunctional group and tetramethoxysilane having a tetrafunctional group were blended.

The emissivity and radiance were measured using a heat conductive / heat dissipating coating film having the composition described above.
FIG. 3 shows the emissivity of the heat conduction / heat dissipation coating film.
FIG. 4 is a radiance spectrum of the heat conductive / heat dissipating coating film.
The radiance was 540.06 kcal / m 2 · hr.
As shown in FIG. 4, a good radiance spectrum is obtained from the low-temperature wavelength region to the high-temperature wavelength region, and the heat dissipation is an emissivity of 85% or more in the wavelength range of 4 μ to 24 μ. It turns out to have. It was proved that high far-infrared conversion efficiency was obtained.

[Heat resistance test]
The process of heating the heat-conducting / heat-dissipating coating film to 800 ° C. and rapidly cooling with water was repeated to test whether cracks would occur.
Heating was performed to 800 ° C. with a burner. The cooling was rapidly performed with cold water. This heating and cooling was repeated 5 times.
The results are shown in [Table 4].

[Surface hardness test]
In order to investigate the wear resistance of the heat conductive / heat radiating coating film of the present invention, a surface hardness test was also conducted using the heat conductive / heat radiating coating film.
The method of the hardness test conformed to JIS-K-5-4.
For the experiment, an aluminum plate fired was used.
The results of the surface hardness test are shown in [Table 5].

  In the above, it was pointed out that 15 to 45% by volume of the ratio of the alkoxide compound and the pigment was appropriate, but it was verified by experiments. The alkoxide compound, which is a binder, is just as well as the coating 2 for heat conductive and heat radiating coating films. It is appropriate to prepare a sample with mixed trimethylmethoxysilane and tetramethoxysilane, and change the volume percentage of the pigment, and then test the surface hardness. The ratio was verified.

Note 1: Representative examples of alkoxide compounds were tested at 66.7% by weight of trimethylmethoxysilane, 33.5% by weight of tetramethoxysilane, and 4,8% by weight of dimethylmethoxysilane.
Note 2: Each reaction condition, dispersion condition, condensation dehydration condition, film thickness, and substrate conform to the above test.
Note 3: The pigment used is 30 vol%, 65 vol%, 5% alumina (Al2O3) with an average primary particle size of 0.15μ, kaolin with an average primary particle size of 0.5μ, and 10-20n silica (SiO2), respectively. What was blended by volume% was used.
Note 4: The dispersion solvent used was a mixture of ethanol and isopropyl alcohol.
Note 5: Dispersion was carried out for 1 hour in a bead mill using 0.7 mm diameter glass beads. The average grain skin at that time was 0.35μ.
Note 6: ○ is hardness 7H or higher, bending 20R is possible, there is no cross-cut test problem, Δ is hardness 7H, there is no cross-cut test problem, X is brittle film and cracking occurs.
As described above, it was proved that 15 to 45% by volume of the alkoxide compound and the pigment was appropriate.

[Corrosion resistance test]
In order to investigate the corrosion resistance of the heat conduction / heat radiation coating film of the present invention, a salt spray test and a water immersion test were also conducted using the heat conduction / heat radiation coating film.
The salt spray test method conformed to JIS-K5600-7-1.
A stainless steel plate was used for the measurement.
The salt spray standing time was 500 hours.
The results of the salt spray test are shown in [Table 7].

The method for the water immersion test was in accordance with JIS-K5600-6-2.
An aluminum plate was used for the measurement.
The immersion time was 500 hours.
The results of the water immersion test are shown in [Table 8].

  As described above, the results of the salt spray test and the water immersion test have proved that the heat-conductive / heat-dissipating coating film of the present invention has high corrosion resistance.

  As described above, the heat conduction / heat radiation coating film of the present invention according to Example 1 and the heat conduction / heat radiation coating film applied / formed by the heat conduction / heat radiation coating film have a large binder adhesion and the far infrared rays of the pigment. High radiation efficiency, large surface hardness, excellent corrosion resistance and heat resistance. In addition, the heat conductive / heat dissipating coating film coating composition of the present invention can control the dehydration condensation reaction of the alkoxide-based binder while being one-component, and can be provided as a one-component coating material having a long pot life and easy handling. .

  In Example 2, the pigment of the heat conductive / heat dissipating coating film 20 contained titanium oxide to impart antifouling properties and anticorrosion properties, and was coated with a far-infrared radioactive substance pigment around the titanium oxide particles. It is characterized by this.

Titanium oxide is known to have antifouling properties due to photocatalytic action. The outdoor unit of the air conditioner of the present invention is installed in a place where it can receive outside light outdoors, but contains titanium oxide as a pigment of the heat conductive and heat radiating coating film 20 formed on the heat radiating fins 30. This makes it possible to impart antifouling properties and anticorrosion properties to the heat dissipating fins 30. Since the radiating fin 30 has antifouling properties and anticorrosion properties, the exchange efficiency of the heat exchanger 100 is not lowered.
Here, the titanium oxide used is preferably an anatase type having high activity. It is considered to have high photocatalytic action, and high antifouling properties can be expected.
When titanium oxide is contained in the pigment, titanium oxide appears on the surface area of the heat conducting / heat dissipating coating film. The pigment, which is a far-infrared radioactive substance, radiates by converting thermal energy received from a heat source into far-infrared energy.

  In this case, if the pigment particles such as titanium oxide and zinc oxide blended for coloring do not contribute to the efficiency of conversion to far infrared rays, the heat dissipation function of the heat conductive / heat dissipating coating film may be reduced.

  Titanium oxide (A-100 manufactured by Ishihara Sangyo Co., Ltd.) used for the heat conductive / heat dissipating coating film 2 produced in the far-infrared radiation experiment of Example 1 is not particularly coated on the surface. Met. FIG. 5 is a schematic enlarged view of the surface of the heat conductive / heat radiating coating film formed using the heat conductive / heat radiating coating film coating material 2. The pigment particles are schematically shown larger. As shown in FIG. 5, titanium oxide particles are exposed along with the pigment which is a far-infrared radioactive substance on the surface of the heat conducting / heat radiating coating film. Since the portion where the titanium oxide particles are exposed does not exhibit the far infrared radiation function, the far infrared radiation efficiency is lowered. Actually, as shown in FIG. 3 and FIG. 4, there is a portion where the spectrum is lowered in the high temperature region (5 to 8 μm).

  The coating material for heat conduction and heat radiation coating film of the present invention according to Example 2 contains titanium oxide as a color pigment and is coated with a far infrared radioactive substance pigment around the titanium oxide particles. Titanium oxide (R-95, manufactured by Ishihara Sangyo Co., Ltd.) used in a coating 3 for a heat conductive / heat radiating coating film, which will be described later, has a surface coated with fine particle size silica.

  FIG. 6 is a schematic enlarged view showing the surface of the heat conductive / heat radiating coating film formed using the heat conductive / heat radiating coating film coating 3. The far-infrared radiation function is exhibited by the function of the far-infrared radiation pigment coated on the surface of the titanium oxide particles even from the portion where the titanium oxide particles are exposed on the surface of the coating 3 for heat conductive and heat-radiating coating film. It will be. In addition, in order to coat the surface of a titanium oxide particle, the far-infrared radioactive pigment coated needs to be a particle size sufficiently finer than the particle size of titanium oxide. That is, the experiment was performed under exactly the same conditions as in Example 1 except that the coloring pigment was coated with titanium oxide.

In other words, the baking conditions were baking at 180 ° C. for 20 minutes, the film thickness was 20 μ to 26 μ, the measurement temperature was 60 ° C., the measurement model was JIR-E500, the measurement conditions were resolution 16 cm-1, the number of integrations was 200 times, and the detector was MCT.
As a sample, a paint 3 for a heat conductive / heat dissipating coating film in which a pigment was blended as shown in [Table 9] was prepared, and a far infrared radiation experiment was conducted.

As the far-infrared radiation pigment, the first pigment of the present invention, silica (SiO2), magnesia (MgO2), cordierite and silica (SiO2), cordierite and alumina (Al2O3), cordierite and silica (SiO2) Among the first pigments containing any one of the compounds of alumina and alumina (Al2O3), silica (SiO2), alumina (Al2O3), and magnesia (MgO2) were used as pigments.
As the coloring pigment, titanium oxide (R-95 manufactured by Ishihara Sangyo Co., Ltd.) whose surface is coated with fine-grained silica is used.
As the binder, trimethylmethoxysilane having trifunctional groups and tetramethoxysilane having tetrafunctional groups were blended.

Radiation measurement was performed using a heat conductive / heat dissipating coating film having the composition described above.
FIG. 7 shows the results of radiation measurement using a thermally conductive / heat dissipating coating film.
FIG. 8 shows a radiation spectrum emitted from the heat conducting / heat dissipating coating film.
When FIG. 3, FIG. 4, FIG. 7, and FIG. 8 are compared, the part where the spectrum is improved in the high temperature region (5 to 8 μm) is clearly seen.

  This spectral improvement is brought about by the presence or absence of silica coating on the surface of the titanium oxide. Therefore, when a coloring pigment is blended, the surface of the coloring pigment is coated with a far infrared radiation pigment. It was proved that the far-infrared radiation function was improved in the heat conduction and heat radiation coating film.

  The coating material for heat conduction / heat dissipation coating film according to Example 3 is a far-infrared radiation pigment, and obtains efficient conversion from a high temperature region to a low temperature region in the spectral wavelength region. In addition to the far-infrared pigment, a second far-infrared pigment having a high radioactivity particularly in a high temperature region is added.

The first pigment is a compound of silica (SiO2), magnesia (MgO2), cordierite and silica (SiO2), cordierite and alumina (Al2O3), cordierite, silica (SiO2) and alumina (Al2O3). It is a pigment containing.
The second pigment is iron oxide (FeO, Fe2O3, Fe3O4), manganese dioxide (MnO2), cobalt oxide (CoO), cobalt trioxide (Co2O3), copper oxide (I) (Cu2O), copper oxide (II) ( A pigment containing at least one simple substance of CuO) or a compound thereof.

  Thus, in addition to the first far-infrared pigment having high radioactivity in the low-temperature region, the second far-infrared pigment having high radioactivity in the high-temperature region is added, so that the low-temperature from the high-temperature region in the spectral wavelength region. Efficient conversion efficiency can be achieved up to the region.

The high-efficiency heat exchanger and the air conditioner of the present invention can be applied to various things.
For example, a domestic air conditioner to which an air conditioner including the high efficiency heat exchanger of the present invention is applied can be provided.
For example, it is possible to provide a commercial air conditioner to which an air conditioner including the high efficiency heat exchanger of the present invention is applied.
For example, a car air conditioner to which an air conditioner including the high efficiency heat exchanger of the present invention is applied can be provided.
For example, the refrigerator which applied the air conditioning apparatus containing the high efficiency heat exchanger of this invention can be provided.

As mentioned above, although preferred embodiment of this invention was illustrated and demonstrated, this invention can be widely applied to the apparatus using a heat exchanger.
It will be understood that various modifications can be made without departing from the scope of the invention.

The figure which showed typically the structural example of the high efficiency heat exchanger 100 of this invention. The figure which shows typically the structural example of the air conditioning apparatus 200 containing the high efficiency heat exchanger of this invention. The figure which shows the radiation measurement result using the heat conduction and heat dissipation coating film The figure which shows the radiation spectrum which heat conduction / heat dissipation coating film emits A schematic enlarged view of the surface of the heat conduction / heat dissipation coating film formed using the heat conduction / heat dissipation coating film A schematic enlarged view of the surface of the heat conduction / heat dissipation coating film formed using the heat conduction / heat dissipation coating film The figure which shows the radiation measurement result using the heat conduction and heat dissipation coating film The figure which shows the radiation spectrum which heat conduction / heat dissipation coating film emits

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Heat transfer tube 20 Heat conduction / radiation coating film 30 Radiation fin 100 High-efficiency heat exchanger 200 Air conditioning apparatus 210 Compressor 220 Outdoor heat exchanger 230 Decompression apparatus 240 Indoor heat exchanger

Claims (19)

  In a heat exchanger that exchanges heat by bringing a heat radiating fin into contact with a heat transfer tube through which a refrigerant passes, the surface of the heat radiating fin is coated with a heat conductive and heat radiating coating film that has both high thermal conductivity and heat radiating properties. And the high efficiency heat exchanger characterized by having improved the heat exchange efficiency between the said refrigerant | coolants. A compressor, an outdoor heat exchanger having a heat exchanger having a large number of heat radiation fins, a decompression device, and an indoor heat exchanger having a heat exchanger having a large number of heat radiation fins are each annularly formed by piping. In an air conditioner connected to form a refrigeration cycle,
Applying a heat conductive / heat dissipating coating film having a property having both high heat conductivity and heat dissipation to the surface of the heat radiating fin of the heat exchanger of the outdoor heat exchanger, the heat of the refrigerant to the outdoor An air conditioner including a high-efficiency heat exchanger characterized by efficient heat dissipation.   The high-efficiency heat exchanger according to claim 2, wherein the heat conduction / heat dissipating coating film is also applied to the surface of the compressor to efficiently dissipate heat generated by the compressor to the outside of the room. Including air conditioner. With a four-way valve that changes the gas flow during heating and cooling operations,
The heat conduction / heat dissipating coating film is also applied to the surface of the heat radiating fin of the heat exchanger of the indoor heat exchanger, and the heat radiation of the heat of the refrigerant in the room heating mode is made efficient in the indoor heating mode. An air conditioner including the high-efficiency heat exchanger according to claim 2 or 3.   The thermally conductive / heat dissipating coating film is formed by applying and drying a paint comprising a binder produced by a hydrolysis reaction and silanol dehydration condensation reaction of an alkoxide compound, a pigment of a far-infrared radioactive material, and a solvent. A coating film composed of a Si-O network formed by the progress of silanol dehydration condensation and a silanol group remaining after hydrolysis of the alkoxide compound, and exhibits the thermal conductivity and the heat dissipation. The air conditioner including the high-efficiency heat exchanger according to any one of claims 2 to 4, wherein the air-conditioning apparatus includes a high-efficiency heat exchanger. The heat dissipating fins are made of an aluminum substrate;
Due to the dehydration condensation between the Si—OH group contained in the alkoxide compound of the binder and the Al—OH group present on the surface of the aluminum base of the heat radiating fin, the heat conducting / heat radiating coating film is formed on the heat radiating fin. The air conditioner including a high-efficiency heat exchanger according to any one of claims 2 to 5, wherein the air conditioner is formed as a film having a chemical bond of an aluminum base and Si-O-Al. .   In the coating material for forming the heat conductive / heat radiating coating film, a trialkoxysilane is used as a binder produced by hydrolysis reaction and silanol dehydration condensation reaction of the alkoxide compound, and tetraalkoxysilane: trialkoxysilane. By blending silane in a ratio of 5: 5 to 0:10, control of the progress of formation of the Si-O network material present in the paint resulting from silanol dehydration condensation after hydrolysis of the alkoxide compound and the remaining silanol groups The air conditioning apparatus including the high-efficiency heat exchanger according to claim 6, wherein the amount is controlled.   In the coating material for forming the heat conductive / heat radiating coating film, trialkoxysilane and dialkoxysilane are added to tetraalkoxysilane as a binder binder produced by hydrolysis reaction and silanol dehydration condensation reaction of tetraalkoxysilane. A coating produced by silanol dehydration condensation after hydrolysis of the alkoxide compound, wherein alkoxysilane: trialkoxysilane: dialkoxysilane is blended in a ratio of 4.5: 4.5: 1 to 7.2: 1.8: 1. The air conditioning apparatus including a high-efficiency heat exchanger according to claim 6, wherein the formation progress of the Si—O network material existing therein and the remaining amount of silanol groups are controlled.   As the coating material for forming the heat conductive / heat dissipating coating film, a coating material which is stable to the coating environment and has high workability by sufficiently aging the molecular growth in the liquid before coating in the binder. An air conditioner including the high-efficiency heat exchanger according to any one of claims 6 to 8.   As a paint for forming the heat conductive / heat dissipating coating film, a paint that can be dried at room temperature by adding a reactive modified organosiloxane having amino group, epoxy group, acrylic group, etc. to the binder is used. An air conditioner including the high-efficiency heat exchanger according to any one of claims 6 to 9.   The pigment in the coating material forming the heat conductive / heat dissipating coating film is silica (SiO2), cordierite and silica (SiO2), cordierite and alumina (Al2O3), cordierite and silica (SiO2) and alumina (Al2O3). The air conditioning apparatus containing the high efficiency heat exchanger of any one of Claim 2 to 10 provided with the 1st pigment containing either of the compounds.   In addition to the first pigment, the pigment in the coating material forming the heat conductive / heat dissipating coating film may be iron oxide (FeO, Fe2O3, Fe3O4), manganese dioxide (MnO2), cobalt oxide (CoO), cobalt trioxide ( A second pigment comprising any one of Co2O3), copper oxide (I) (Cu2O), copper oxide (II) (CuO), nickel oxide (NiO), zirconium oxide (ZrO2) or a compound thereof. An air conditioner including the high-efficiency heat exchanger according to 11.   The air conditioning apparatus including the high-efficiency heat exchanger according to any one of claims 2 to 12, which contains titanium oxide as a pigment in the coating material for forming the heat conducting / radiating coating film.   14. The air conditioner including a high-efficiency heat exchanger according to claim 13, wherein a pigment of the far-infrared radioactive material is coated around the titanium oxide particles. The solvent is an alcohol having a boiling point higher than room temperature;
The high-efficiency heat exchanger according to any one of claims 2 to 14, wherein a porous structure is formed by volatilizing the solvent during the formation of the heat conduction / heat dissipation coating film. Air conditioner.   A domestic air conditioner to which an air conditioner including the high-efficiency heat exchanger according to any one of claims 2 to 15 is applied.   A commercial air conditioner to which an air conditioner including the high-efficiency heat exchanger according to any one of claims 2 to 15 is applied.   A car air conditioner to which an air conditioner including the high-efficiency heat exchanger according to any one of claims 2 to 15 is applied.   A refrigerator to which an air conditioner including the high efficiency heat exchanger according to any one of claims 2 to 15 is applied.

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