JPS6164765A - Infrared radiating and absorbing paint and preparation thereof - Google Patents

Abstract

PURPOSE:To obtain the titled painting which has excellent infrared radiating and absorbing efficiency and is effective in energy saving, by finely grinding a solid solution made by mixing and sintering powders of specified three or more transition-element oxides, and incorporating it into a coating. CONSTITUTION:A solid solution obtained by sintering a mixture of powders of three or more transition-element oxides which are selected from among 15-80wt% MnO2, 5-25wt% CoO, 0-80wt% Fe2O4, and 0-10wt% and which have a wavelength region showing a high infrared spectral reflectance, different from each other, and if necessary, an extender such as ZrO2, at a temperature of 1,000 deg.C or higher and lower than the melting point of each component afore mentioned under ordinary pressures for at least 20min, is ground to 0.1-20mum in a grinder, such as a jet mill, to give an infrared radiating and absorbing base material. 25-75wt% obtained base material and 75-25wt% coating, such as a ceramic coating composed mainly of SiO2, Zr2O3, Al2O3, etc. or a synthetic resin coating consisting of an epoxy resin, are compounded.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a paint that transfers heat by infrared rays, and in particular, is applied to the surface of an object that requires heat radiation or absorption. Alternatively, the present invention relates to an infrared radiation/absorbing paint for improving absorption efficiency and a method for producing the same.

(Prior art) In general, in heat dissipation devices such as heaters and heat exchangers, and heating devices such as pots and boilers, infrared rays are applied to the surfaces of these devices as a means to improve their heat capture efficiency and heating efficiency. Paints that can improve radiation or absorption efficiency are being applied.

Conventionally, as paints that can improve the efficiency of emitting and absorbing infrared rays, there are black paints that are completely mixed with black pigments such as carbon black, acetylene black, and graphite, and are used by applying them to surfaces that emit and absorb heat. . Additionally, ceramic paints are used in some areas as they are considered effective in emitting and absorbing infrared rays.

(Problem to be solved by the invention) However, in the case of such a conventional example, the former black paint uses an allotrope consisting only of carbon as a black pigment, and carbon itself has a low infrared radiation efficiency. This black paint was not satisfactory as an infrared radiation/absorbing paint. The latter ceramic paint had better infrared radiation and absorption efficiency than other materials, but it had a spectral difference in the wavelength range of 5 μm or less, which is particularly important for infrared rays as heat rays that transmit heat. The problem was that the emissivity was low and the efficiency of infrared radiation and absorption was poor.

The present invention has been made to solve the problems of the prior art, and its purpose is to:

An object of the present invention is to provide an infrared radiation/absorption paint having high infrared radiation/absorption efficiency in the entire infrared wavelength range and an infrared spectral emissivity close to that of an ideal black body, and a method for producing the same. .

(Middle section for solving the problem) Therefore, in order to achieve the above object, the present invention provides a coating material having three different wavelength ranges showing infrared spectral emissivity. A solid solution of more than one type of transition element oxide is finely pulverized and mixed into a paint. In addition, in the production method of the present invention, a powder mixture of three or more types of transition element acids (arsenium) having different wavelength ranges showing high infrared spectral emissivity is calcined to form a solid solution, and then the corresponding The solution is milled into ridges and mixed into the paint.

Below, the infrared radiation/absorbing paint according to the present invention will be explained along with its manufacturing method.

First, regarding the infrared radiation and absorption performance of each single transition element oxide, the infrared spectral emissivity is measured using an infrared spectrophotometer, and transition element oxides exhibiting a low spectral emissivity are selected. As this transition element oxide, manganese dinitrate Mn
O2, cobal oxide) Coo, iron oxide Fet O5, copper oxide Cub, zircon oxide Zr0t, etc.

Next, among the above transition element-based oxides, those whose wavelength ranges that indicate a simple infrared spectrophotometer are different from each other (i.e., short wavelength,
Those with high infrared spectral emissivity in the medium wavelength and long wavelength regions are selected from Class 3a or higher, and the powders of these transition element oxides are stirred and mixed. The mixture components and mixing proportions are shown in Table 1. It's a friend, and the unit is weight %.

Table 1 All powders of λ-transfer element oxides mixed in the above proportions were sintered at a temperature of 1150°C as described in Table 1 (+
), (2), (3) infrared spectral emissivity 1
As shown in the figure.

As is clear from the graph in FIG.
it%, Co 05~25 'BQ,', amount%, Fe
2O30~80 Carsha%, (::uOO~I O4ji
-! 'i (9) If the paint described later is a synthetic resin, oil-based, or water-based paint, ZrO, etc. may be mixed as a landscape enhancing material. In addition to the infrared spectral emissivity, the target paint's adhesion, heat resistance, abrasion resistance, acid resistance, alkali resistance, and food hygiene standards when used for cooking utensils such as pots are also considered. , raw material prices, etc. will be reconsidered.In addition, the above ?jl
In addition to the quantity, we conducted experiments and obtained satisfactory infrared spectroscopy) J
The firing rate is f! I couldn't do it.

Furthermore, the mixture of the transition element rr2 compound powder is sintered to form a solid solution at a temperature of 1000° C. or higher and lower than the melting temperature of each of the components for 20 minutes or longer at normal pressure. Thereafter, the solid solution is pulverized to a size of 0.1 to 20 μm using a pulverizer such as a jet mill to form an infrared radiation/absorption base material. Here, the reason why the mixture of transition element oxide powders is made into a solid solution without being melted is to facilitate pulverization.

Then, the infrared radiation/absorption base material is mixed into various paints in an amount of 25 to 751% of its solid content to produce an infrared radiation/absorption paint. Various types of paints are used as the paints, such as ceramic paints, synthetic resin paints, water-based paints, and oil-based paints, but here we will explain the case where an infrared radiation/absorbing base material is mixed into the ceramic paint and the synthetic resin paint, respectively.

First, in the case of ceramic paint, its main component is 5
iO1, Zr, 03. There are various types of tD, such as a solid solution of Zr2O3 and Sin, A/'20s, and a solid solution of Aez Os and 5tOt. The specific gravity of the solid content of the ceramic paint of Kosai et al. is almost the same as that of the infrared radiation/absorbing base material. An infrared ray emitting/absorbing paint is created by mixing an infrared ray emitting/absorbing base material.

2JS 2 table shows Mn as the infrared radiation/absorption group 14.
0160%, Fe2O, 20%, CuO10%, C
010% was mixed and sintered at 1150°C, and then made into a ceramic product 1;? 5r+z"*ruko-f" if-
The mixture ratio of the light (2MfO-2AI!NO, -5SiOt) is shown.

, fc, and the unit is weight %.

Table 2 A'21::, l is the mixture '↑C (1
), (2), and (3) infrared rays indicate "4 spectral emissivity.

On the other hand, in the case of resin paints whose main film-forming elements are epoxy resins and acrylic resins, the solid content of the resin coating material has a specific gravity of around 1, but the specific gravity of the infrared emitting/absorbing base material is 5 or more. Therefore, from the perspective of infrared radiation and absorption, the solid content is 30
It is preferable to mix it so that the market weight is ~75%.

However, for reference, when the paint is a heat-resistant paint, it is desirable to mix the solid content to 25 to 75% by weight, although this will vary depending on the specific gravity and weight % of the solid content of the paint.

The infrared radiation and absorption obtained in this way is iron,
It is used by applying it to the surface of a member made of any material such as metal such as aluminum, wood, ceramic, or plastic.

(Example ■) Infrared radiation and absorption of the infrared radiation and absorption paint of the present invention
In order to investigate the absorption performance, 25% by weight of an infrared radiation/absorbing base material was mixed with 75% Sin in a ceramic paint containing 5jOztl as the main component, and this was applied to the surface of an iron plate to a thickness of 30 μm. Infrared rays of the coated surface, ζj
-τ minute-? (, the emissivity was measured as F.1llll'
) The resulting spectral emissivity is shown in Figure 3. As shown in Figure 3, infrared radiation/absorption ceramic paint is applied to a thickness of 30 mm.
μm (−L cloth), emitting surface c blackness 500
The infrared spectral emissivity at °C showed a value of 0.90 or more in the wavelength range of 2 to 25 ttm.

(Actual sister example ■) We applied the same ceramic-based infrared radiation/absorption paint as above to commercially available stainless steel, and experimented to see how effective it was in heat transfer. Prepare 3 pieces of stainless steel,
These pots were coated with infrared emitting/absorbing paint as follows.

A: Not applied B: Infrared radiation/absorption paint on the outer surface of the bottom of the pot, total thickness 30μ
C: Apply infrared radiation/absorption paint to the inner and outer surfaces of the bottom of the pot to a thickness of 30 mm.
Pour 5ooC1:,'i of water into these pots and place them on the surface of the heating section of a heat generator with a rated power of 600W at a daytime temperature of 25fuR and 3+dK, and set the heating time. The temperature change of water was measured. The results are shown in FIGS. 4 and 5.

As is clear from these results, pots B and C coated with infrared radiation/absorption paint have significantly improved heat transfer efficiency.
Friend, the one with a height of 3" above the heater is 25II.
The reason why the difference in heat transfer efficiency between pots B and C and pot A is smaller than that of IjA is because the flatness of 3 mm is closer to that of an electric heater.
This is because, in addition to heat transfer by infrared radiation, convection heat transfer has a large influence. Note that the heat transfer efficiency of pot C is somewhat lower than that of pot B because of the infrared radiation applied to the inner surface of the bottom of the pot.
Infrared rays are emitted from the absorbing paint to the outside through the water in the pot.

(Example M) Using the same pots A, B, and C'i as in Example 2 above, an experiment was further conducted to improve heat transfer efficiency using infrared radiation/absorption paint. Pour 700cc of water into these pots A, B, and C.
Prepare two sets of food, one set has 215ftl of udon noodles.
1 In the other group, potage soup powder 672 was placed and placed at a height of 25U from the heating part surface of an electric heater with a rated power consumption of 600W, and the temperature change of the contents was measured with respect to the heating time. The measured results are shown in Figure 6 and 2.
Shown in the via diagram. As is clear from this result, pots B and C, which were coated with infrared radiation/absorbing paint, are different from pot A, which was not coated.
Heat transfer efficiency has been significantly improved compared to In addition, in cases where contents other than water are placed in the pot as in Example ν11, the contents may be applied to the inner fitting surface of the bottom of the pot and the
In order to absorb some of the infrared rays emitted by absorbing paint,
The difference in heat transfer efficiency between pots B and C is small.

(Effect of 6th Light) The present invention has the above-described structure and operation, and uses a powder mixture of three or more types of transition element oxides having a wavelength range of After sintering and forming a solid solution, the solid solution is 1-D sintered and mixed into the paint.
It is possible to provide an infrared radiation/absorption +1'7 paint having infrared radiation/absorption efficiency close to that of an ideal black body in substantially the entire infrared wave range. Therefore, this infrared radiation/absorption paint 'fi: C? By using the above-mentioned heat radiating equipment, the heat radiation and heating efficiency of the heat radiating equipment can be dramatically improved. Less energy is required to cool or heat the heating device, which has the effect of helping to save energy.

[Brief explanation of drawings]

Figure 1 is a graph showing the infrared spectral emissivity of a mixture made by mixing and sintering transition element oxide powder, Figure 2 is a graph showing the infrared spectral emissivity of a ceramic paint mixed with an infrared radiation/absorbing base material, Figure 3 shows the infrared radiation according to the present invention.
A graph showing the infrared spectral emissivity of the absorbing paint, Figure 4 is a graph showing the measurement results when water is poured into a pot coated with the same infrared radiation/absorbing paint and the total heating efficiency is measured. A graph showing measurement results that differ only in heating conditions from those shown in the figure. Figure 6 is a graph showing measurement results when water and udon noodles are placed in a pot coated with the same infrared radiation/absorption paint and the heating efficiency is set to 6111. , FIG. 7 is a graph showing the measurement results when water and powdered soup were poured into a pot coated with the same infrared radiation/absorption paint and the heating efficiency was measured. Figure 1 Atsushi Figure 2

Claims (9)

[Claims] (1) A solid solution obtained by mixing and sintering powders of three or more transition element oxides with different wavelength ranges that exhibit high infrared spectral emissivity, and then finely pulverizing the solid solution and mixing it into the paint. Infrared radiation/absorption paint. (2) Infrared radiation and absorption according to claim 1, wherein the transition element oxide is a combination of at least any three of manganese dioxide, cobalt oxide, iron oxide, and copper oxide. paint. (3) The component of the transition element oxide is manganese dioxide 1
5 to 80% by weight of cobalt oxide, 5 to 25% by weight of cobalt oxide, 0 to 80% by weight of iron oxide, and 0 to 10% by weight of copper oxide. . (4) The infrared radiation/absorbing paint according to claim 1 or 2, wherein the transition element oxide contains an extender such as zirconium oxide. (5) After mixing powders of three or more types of transition element oxides with different wavelength ranges showing high infrared spectral emissivity,
The mixture is sintered at a temperature of 1000°C or higher and lower than the melting temperature of each of the components to form a solid solution, and then the solid solution is finely pulverized to form an infrared radiation/absorption base material, and the infrared radiation/absorption A method for producing an infrared radiation/absorbing paint, characterized in that a base material is mixed into the paint. (6) Infrared radiation and absorption according to claim 5, wherein the transition element oxide is a combination of at least any three of manganese dioxide, cobalt oxide, iron oxide, and copper oxide. Paint manufacturing method. (7) The component of the transition element oxide is manganese dioxide 1
5 to 80% by weight of cobalt oxide, 5 to 25% by weight of cobalt oxide, 0 to 80% by weight of iron oxide, and 0 to 10% by weight of copper oxide. manufacturing method. (8) The method for producing an infrared radiation/absorbing paint according to claim 5 or 6, wherein the transition element oxide contains an extender such as zirconium oxide. (9) The infrared radiation/absorbing paint according to any one of claims 5 to 8, wherein the mixing ratio of the infrared radiation/absorbing base material is 25 to 75% by weight. Production method.