JPH0338254A - Heat-resisting film - Google Patents

Abstract

PURPOSE:To obtain a film which provides so a hard and slippery surface as to permit the removal of oily stains by mixing a layer structure compound and a solid oxide compound with polyporosiloxane for use as a binder. CONSTITUTION:Semiorganic polyporosiloxane and polyporotitanosiloxane are used as a binder in the formation of a heat-resisting film on the surface of the inner wall of cooking oven, grille, etc. A layer structure compound such as quartz glass is mixed with such film to make it flat and smooth and a solid oxide compound such as ZrO2 is also mixed therewith to control the formation of tar. Since the film thus formed is high in solidity, good in surface slipperiness and has a cracking action on oily stains, the soiled spots are easy to remove.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat-resistant coating that has the ability to purify oil stains and is applied to areas where oil stains are noticeable, such as the inner walls of cooking ovens, grills, etc. .

BACKGROUND OF THE INVENTION Conventionally, coatings with the ability to remove oil stains by catalytic combustion have been developed using Mn, Cu, and Fe in a ripening-resistant inorganic binder such as a metal phosphate or silicate.

Most of the materials were dispersed with metal oxides such as Co and Ni, or mixtures or composites of metal oxides.

This kind of coating uses the catalytic action of metal oxides to burn and decompose oil stains at low temperatures.

Problems to be Solved by the Invention However, the above conventional techniques have similar problems as follows.

1. First of all, to completely burn off the oil stains.

The coating must be made as porous as possible in order to increase the contact area between the oil and the catalyst and improve oxygen diffusion within the coating. However, if it is made porous, the hardness is low, and there are practical problems such as peeling and scratches.

In Kakitayaki, the remaining tar components get into the porous gaps and settle! However, the purification performance may gradually decrease.

Second, when oil burns, the local temperature is s o O
``As the C level rises in the trenches, the metal oxide gradually sinters, reducing purification performance, and the coating changes color due to reduction of the metal oxide in the casing.

As mentioned above, there are some problems with the conventional technology, but the present invention deals with a method of cleaning oil stains on a dense and highly hard film.

Means for Solving the Problems In order to solve the above problems, the present invention provides a method using a compound having a layered structure and a solid acid compound using one or a mixture of the two of polyborosiloxane and polyborotitanosiloxane as a binder. It is what it is.

action The oil stain purifying effect of the film according to the present invention will be explained.

For stains, triglycerides of higher fatty acids such as oil,
Examples include protein, carbohydrates, salt, ash, etc.
Here, the action will be explained using oil as a representative example.

If the structure of oil is given by formula (1), the reactions necessary for purification are the breaking of carbon bonds and oxidation to carbon dioxide and water.

R, -C-0-CH2 1 (R1, R2, Rs are saturated or unsaturated alkyl groups) When heat is applied to oil, dehydrogenation and tar formation occur.

High temperatures of 460°C or higher are required to oxidize and decompose tar. Therefore, conventional porous coatings incorporate a catalytic action into the thermal decomposition process to decompose tar at a relatively low temperature.

However, in practical use, porous coatings have problems such as being easily peeled off and easily damaged. Furthermore, if complete combustion is the goal, there will inevitably be a limit to the ability to purify dirt.

Therefore, in the present invention, first of all, we focused on weakening the bonding force between the tar component and the coating surface.

The semi-organic polyborosiloxane and polyborotitanosiloxane used as the binder in the present invention have a temperature of 450"C.
When fired in the above manner, it becomes mineralized and a very dense thin film can be formed.

Furthermore, by mixing a layered compound, the surface of the coating was smoothed and smoothness was improved.

Furthermore, since the coating surface is a non-oxide layer, the chemical adsorption power of tar components is also weak. Therefore, the tar generated under heating is easily peeled off from the coating surface. Since the film is smooth, peeled tar components and other dirt can be easily wiped off.

Second, solid acid was added to suppress tar formation.

The action of solid acid breaks the carbon-carbon bonds in the oil at the surface of the 'am, causing it to decompose in the oxygen and carbon dioxide chambers in the air.

As described above, the heat-resistant coating of the present invention oxidizes and decomposes oil stains through the action of solid acids, and furthermore, because the m-film is dense and has good surface lubricity, residual tar components and ash are easily removed. Peel off,
It is possible to wipe it off.

Example An embodiment of the present invention will be described below.

I will explain the method of making jizu. Binder and filler, solid acid compound, sulfide or nitride and solvent for 24 hours,
Disperse the paint with an attritor and spray it with a spray gun (DeVilbiss spray gun).

/x' Roulo diameter 1.4tilφ, Air pressure 2~2.5
kg/cd) stainless steel (St) 8304,43
0) A film was created by coating on a substrate and baking in order at 100''C→SOO°C.

Next, a certain amount of salad oil was dropped onto the film, and the film was left open at a certain temperature to perform an oil purification test.

Table 1 shows the composition of the paint used to form the film and the results of the oil purification test. All formulations are shown in weight ratios.

(Hereafter, extra white) Note that toluene was added as a solvent at a ratio of 180:1.

For /161-10, quartz glass is also used. The enamel component was added at a ratio of 20 parts, and for fakes 11 and 12, 10 parts of quartz glass was added.

The oil purification test was conducted at 380°C and the time required for purification was indicated.

The reason why 1 quartz glass was added this time was to increase the film hardness. Also MoS2. WS2. BN addition and using polyborosiloxane as an inder 1~/1
The membrane of No. 69 has good slipperiness (410-AI 2 (7) membrane has a porous finish. MoS2. WS2. B N
Among these, the film containing MoS2 had a very high pencil hardness of 9H.

For solid acids, the acid strength is 5in2/mu e2o, >zr
o2) Since it is TiO2, TiO2 was added/%
7.

8.9 has somewhat better purification performance. However, this time we used Si
O2/mu e20. (ZSM-s) The membrane peeled off during the oil purification test using strong halogen acid II. Among the solid acids used this time, Zr02 (Kobe Steel R5C-1
00) is optimal.

The results of the oil purification test were 41~/ as shown in Table 1.
166 is decomposed and removed at about 380'C for about 2.5 hours. In addition, Fukui 1 has a high film hardness of 9H, resulting in a dense and slippery film with high purification performance.It is possible to break carbon-carbon bonds with acid and weaken the binding force between the film surface and tar with sulfides or nitrides. did it.

When metal oxide is added like A10.

The metal oxides were covered with binder and the oil could not be burned in an oxygen atmosphere, leaving a residue.

Using a cased phosphate or silicate as a binder/1
No. 610 and No. 11 had poor oil purification performance because the pH of the membrane was biased toward acid or alkali, and because they were porous, tar was deposited inside the pores.

As described above, the heat-resistant coating of the present invention can break the carbon-carbon bonds of dirt and physically and chemically weaken the bonding force between the coating surface and tar, so it can be used in practical applications such as on the inner walls of cooking appliances. It is a heat-resistant coating suitable for

As described in detail, the heat-resistant coating of the present invention has a high hardness of 1.
Since the surface has good slipperiness and also has a cleaning effect on oil stains, it is possible to obtain a coating that is excellent in cleaning stains inside the cooker.

After dirt adheres to the film, the dirt is removed by heating the film, and the remaining ash and deposits can be easily peeled off and wiped off, so the film can be kept in a clean state at all times.

Claims (3)

[Claims] (1) A heat-resistant film made of a compound having a layered structure and a solid acid compound, using one or a mixture of the two of polyborosiloxane and polyborotitanosiloxane as a binder. (2) Compounds with layered structure are MoS_2, WS_2
, BN or a mixture of two or more thereof. (3) Solid acid compounds are ZrO_2, TiO_2, SiO
The heat-resistant coating according to claim 1, comprising one type or a mixture of two or more types of _2-Al_2O_3.