JPS61115968A - Paint composition for radiation of far-infrared ray and far infrared radiation heater - Google Patents

Abstract

PURPOSE:To provide the titled paint compsn. which forms easily and inexpensively a far-infrared radiation element having excellent radiation characteristics for a far-infrared heater by dispersing alumina, alone or together with an inorg. oxide powder in a binder. CONSTITUTION:Alumina having a particle size of 120mu or below and a purity of 85% or above or a mixture thereof with not more than 50wt% inorg. oxide powder (e.g. titanium oxide powder) is dispersed in a binder such as a silicone resin to obtain the desired paint compsn. for radiation of far-infrared rays. The paint compsn. 1 is applied to the surface of a heat-resistant insulating sheet 2 such as metallic sheet, mica or glass in the form of a film of several muor above, pref. at least 20mu in thickness, and heat-treated to form a far- infrared radiation element 3 which radiates mainly light having a wavelength of 5mu above. A planar heater element 4 is laminated on the back of the radiation element 3 to obtain a far-infrared radiation heater.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is a method of directly absorbing electromagnetic waves radiated from a heat source into an applied W&object without any medium in the second form of thermal energy transfer to an object. This is thermal radiation that can perform efficient heating using the thermal action associated with molecular vibrations within an object.It is a far-infrared heater that emits infrared rays in the 3, f-20% wavelength range, which is easily absorbed by many substances. The present invention relates to a coating composition used to construct an infrared radiator (surface) I, and a far-infrared radiant heater constructed using the coating composition.

<Prior art> The most important point in far-infrared radiant heaters is that the emissivity of the radiator (surface) is high and
At a relatively low surface temperature of 00OC or higher, there is less radiation in the visible region and more radiation in the far infrared region.In response to this, various ceramics such as alumina, Guku7ite, and zirconia are used to create radiators (surface ) has been put into practical use. In particular, high-quality alumina, which is superior to other ceramics in far-infrared radiation characteristics, is often used.

However, in the past, a dedicated coating for aFiLing the entire far-infrared radiator (surface) had not been developed, and plasma spraying of alumina was exclusively used.

<Problems to be solved by the invention> The above-mentioned plasma spraying means sprays 5,000 ml of alumina powder.
It is melted using an extremely high temperature non-oxidizing heat source of about -7,000°C and accelerated by a plasma jet through a T-spray gun to make it resistant to metal plates, mica, asbestos, etc.! J
'4! It is a method that forms an alumina film by thermal spraying on the surface of an IR plate.It does not require a thermal spray base (cathelyzer) such as aluminum vapor deposition on the plate surface, but uses very high thermal energy and kinetic energy. In addition, there are various disadvantages such as the alumina film formed by plasma spraying is easily rounded, and the radiation surface is limited to a one-dimensional flat heater, making it less versatile. Ta.

Means for Solving and Resolving the Problems> The first invention makes it possible to form far-infrared radiators with radiation characteristics comparable to those formed by plasma spraying very easily and at low cost. The object of the present invention is to provide a paint composition, and the second invention provides a far-infrared radiant heater t-a that is low cost and has high versatility in terms of form by utilizing the above composition. Something that has a purpose.

Therefore, nine books were developed to achieve the first purpose above.
The far-infrared radiation coating composition according to the invention is characterized in that alumina alone or a mixture of alumina and inorganic oxide powder in a proportion of 50 parts or less by weight is dispersed in a binder, and Log I was devised to achieve the second purpose above! The far-infrared radiant heater according to the invention I2 comprises a stone coating composition in which alumina alone or a mixture of 11/1C inorganic lx oxide powder in a proportion of 50 parts or less by weight is dispersed in a binder. , on the surface of a metal plate or a heat-resistant insulating plate made of mica, asbestos, glass, etc., a film-like IC111 cloth with a thickness of several tones or more, preferably 20 tones or more, is buried, and the wavelength is 5 tones.

A far-infrared radiator that emits a large amount of the above radiation is constructed, and the Kl-shaped heating element on the back of this radiator is polymerized (the end point is ``Fya white 2, - ni shishi &4)''. It has the following characteristics.

<Operation and Effects of the Invention> The composition of the far-infrared radiation coating material according to the first invention having the above-mentioned characteristics has as a main component a highly pure alumina that has excellent far-infrared radiation characteristics, and has heat-resistant alumina. Dispersed in a binder such as methylphenyl silicone [81], which is thick, has high water resistance, and has excellent electrical insulation, chemical resistance, aging resistance, and nonvolatile properties, and is dispersed in a binder such as thinner or other volatile It can be made into a suspension using an aromatic solvent and can be applied by brushing or spraying to a thickness of 20. By applying the material in an amount of y or more and drying and curing, it fully satisfies various properties such as heat resistance, electrical insulation, chemical resistance, aging resistance, etc. as a far-infrared radiator with high wi-repulsion. At the same time, it is also 100% in terms of radiation characteristics.
The radiation at temperatures above ``''C has a wavelength of 5-25.l,
lrn Te 501 or higher and wavelength 5μm or less 30
1 or less, it is possible to form a radiator that is almost the same as that produced by plasma spraying.

Incidentally, FIG. 6 is a graph showing a complete comparison of the radiation characteristics of a radiator formed by plasma spraying of alumina and a radiator formed by applying the composite proboscis of the present invention.
Is the wavelength approximately 5 m or more? It is clear that in selectively emitting more radiation, there is no difference between the emissivity of the present invention shown by the solid line and the emissivity of plasma spraying shown by the dotted line.

Compared to conventional plasma spraying, this method has the effect of making it possible to form the front two radiators very easily and at low cost.

Further, the far-infrared radiant heater according to the second invention includes applying the above-mentioned paint composition on the surface of a metal plate or a heat-resistant insulating plate in the form of a film having a thickness of at least 1 β, preferably at least Fi20β, By effectively utilizing the above-mentioned 1Ju characteristic of the composition, a heater having excellent durability and radiation characteristics can be manufactured easily and at low cost.

Moreover, unlike thermal spray coatings, alumina is distributed uniformly within the coating thickness, which has excellent resistance to mechanical stress, making it easy to apply to curved surfaces without causing splitting, and therefore limiting the use of flat heaters. decentralized according to the purpose of use, without being
The centralized type can also be applied to two-dimensional and three-dimensional curved heaters, making it possible to achieve a sufficiently high degree of versatility in terms of form.

<Example> Embodiments of the present invention will be described in detail below based on the drawings.

Figure 1 shows the cross-sectional structure of the far-infrared radiant heater, and the second factor shows the external appearance. ff1llff, which will be described later, is applied to the entire surface of the
Product (1) - A far-infrared radiator ( 3). 141 The far-infrared radiator (3
) is a planar heating element polymerized through an inorganic insulating plate flslt'' with excellent heat resistance and electrical insulation such as mica or asbestos, which is made by etching a thin nichrome plate, stainless steel copper plate, etc. Alternatively, it may be made into any shape by press die cutting, or printed with heat-generating metal bar w4 powder paste in any shape, or wrapped with nichrome wire around an electric insulating plate such as mica. , [1 is the heater element (
4) is a far-infrared reflector that is attached to the back side of the infrared rays, and is laminated to the back side of a monolithic insulation board (6A) made of mica or the like and made of aluminum C6υ.

The above components are integrated by fitting them into an aluminum or iron case (1) with a U-shaped cross section.
Therefore, a one-dimensional planar far-infrared radiation heater tse as shown in FIG. 62 is created.

And the aforementioned radiator 111) 'k i l1i12
Possible items (1) for this purpose include the following.

Regarding the radiation characteristics of each of the above-mentioned compositions, ① emits the most wavelengths of 5βm or more, and as the composition becomes ③, the radiation of wavelengths of 5ylm or less increases.

As the reflector (6) in the far-infrared radiant heater described above, an aluminum plate or a stainless steel plate may be used as shown in Figure @3, and the protruding peripheral portion (6 m) of this reflector (6) 'e Radioactivity 1--can be made even better by folding it in an inclined position toward the far-infrared radiator (3) side.

In addition, the shape of the radiator (31 is not limited to a flat plate type),
It may be a concave curved plate shape or a convex curved plate shape as shown in Fig. F14 or Fig. 5, which locally radiates far infrared rays in a concentrated manner, or it may be radiated diffusely, or it may be cylindrical or semi-cylindrical depending on the purpose of use. It is possible to take any form such as a shape.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, FIG. 1 is a sectional structural view of the heater, FIG. 2 is a schematic perspective view of the entire heater, and FIG. 3 is a sectional S structure showing another embodiment. Figures 4 and 55
! J is also a schematic sectional view showing an example of each side, and the sixth factor is a custom-made comparative glove. (1) is a paint composition, (2) is a metal plate or heat-resistant insulating plate, +31a far-infrared radiator, and (4) is a heater element. ＊''A゛te (voluntary) procedural amendment published on July 7, 1980 1, Indication of the case 1982 Patent Application No. 2310g6 No. 1923 No. 2, Title of invention Far-infrared I! For radiation Relationship between paint composition and far-infrared radiant heater 3° correction case Patent Applicant 4, Agent 〒
530 7 Amend the Specification of Contents of the Amendment to the appended document, Claims v3. 8 Attached document stating the scope of claims after correction of the M3 catalog xf11
+Claims■ A recombinant far-infrared radiation paint comprising alumina alone or alumina mixed with an inorganic oxide powder in an amount of 50 parts or less using a mik, dispersed in a binder. ■ The alumina has a particle size of 1201 or less and a purity of 85%.
The composition according to claim 0, which is used for all of the above. (2) The assembly according to claim 0, wherein any one of a silicone resin, a diphosphate, or a silicate is used as the binder. ■ The inorganic oxide powder is titanium, mica, 2''6
The composition according to claim 0 and 12, which is a single or double mixture of oxide powders of iron, i, cobalt, niracle, manganese, and chromium. ■ Alumina Asahi Germany, F again! A paint composition consisting of alumina mixed with a binder containing a mixture of scorched affix oxide powder in a proportion of 50g/l or less, metal plate, or arc-resistant material such as mica, asbestos, glass, etc. - Insulating board (210 on the surface, with a thickness of 1 or more, preferably 20
It is coated in a film shape larger than a stone and then heat treated to a wavelength of 5 II m.
A far-infrared radiator (3) t-consisting of a far-infrared radiator that emits more than
On the back of this radiator (3) is a planar heater element +4.
Far infrared radiant heater with 1 km alignment. ■ The alumina grains are 1120. Below ff, purity 8
The heater according to claim 0, which uses 5 or more inches. (2) The heater according to claim 0, wherein any one of silicone, fat, phosphate, or scitrate is used as the noise material. ■ The inorganic oxide powder is titanium, mica, 9zL
- The heater according to claim 0, which is a single or a mixture of oxide powders of three air, iron, copper, cobalt, niracle, manganese, and chromium.

Claims (8)

[Claims] (1) A far-infrared radiation coating composition comprising alumina alone or alumina mixed with an inorganic oxide powder in a proportion of 50 parts or less by weight, dispersed in a binder. (2) The alumina has a particle size of 120μ or less and a purity of 85
% or more of the composition according to claim (1). (3) Claim No. 1 (2) in which silicone resin, phosphate, or silicate is used as the binder.
The composition according to item 1). (4) According to claim (1), the inorganic oxide powder is one or a mixture of two or more of titanium, silicon, zirconium, iron, copper, cobalt, nickel, manganese, and chromium oxide powder. Compositions as described. (5) A stone coating composition (1) prepared by dispersing alumina alone or a mixture of alumina and an inorganic oxide powder in a proportion of 50 parts by weight or less in a binder is applied to a metal plate, or
A far-infrared radiator (a far-infrared radiator) that is coated on the surface of a heat-resistant insulating plate (2) made of mica, asbestos, glass, etc. in the form of a film with a thickness of several microns or more, preferably 20 microns or more, and heat-treated to emit a large amount of wavelengths of 5 μm or more. 3), and a far-infrared radiation heater in which a planar heater element (4) is superposed on the back of the radiator (3). (6) The alumina has a particle size of 120μ or less and a purity of 85
% or more of the heater according to claim (5). (7) The heater according to claim (5), wherein any one of a silicone resin, a phosphate, or a silicate is used as the binder. (8) According to claim (5), the inorganic oxide powder is one or a mixture of two or more of titanium, silicon, zirconium, iron, copper, cobalt, nickel, manganese, and chromium oxide powder. Heater as described.