JPS62106968A - Composition for coating - Google Patents

Abstract

PURPOSE:To provide a compsn. forming an inorg. coating excellent in heat resistance, durability, waterproofness, and chemical resistance on the surface of a substrate by low-temp. heating in a short time, by mixing particular silane compd. and zirconium compd. with an org. solvent and a filler. CONSTITUTION:A compsn. for coatings is yielded by mixing (a) at least one silane compd. of tetraalkoxysilane of formula I (wherein R is a 1-5C hydrocarbon residue), hydrolyzates thereof, and partial condensates of the hydrolyzates, (b) 3-30pts.wt. at least one zirconium compd. of zirconium tetraalkoxide of formula II (wherein R' is a 1-5C hydrocarbon residue), hydrolyzates thereof, and partial condensates of the hydrolyzates, (c) 10-90pts.wt. org. solvent, and (d) 1-60pts.wt. filler, with the proviso that (a)+(b)+(c)+(d)=100pts.wt.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to coating compositions, and more particularly to coating compositions for coating the surfaces of iron, stainless steel, aluminum and other metals as well as cement, glass, plastics and other products. , a pure inorganic film with excellent heat resistance, durability, water resistance, and chemical resistance is created by short-time low-temperature heating, and is used for high-temperature oxidation prevention, infrared radiation, heat insulation, electrical resistance, conductivity, corrosion protection, etc. The present invention relates to a coating composition for.

[Conventional technology]

Traditionally, pure inorganic coating compositions include ■alkali metal salt-based coating agents, ■acidic metal salt-based coating agents, or ■Si(OR')4 (where R1 is carbon number 1).
Metal alkoxide-based coating agents such as those containing hydrocarbon residues of 5 to 5 have been proposed.

[Problem that the invention seeks to solve]

However, among the above-mentioned coating agents, (1) alkali metal salt-based coating agents have limited water resistance and acid resistance because they contain alkali, and cannot be used for electrical resistance purposes. Furthermore, the above-mentioned acidic metal salt-based coating agent (1) has the disadvantage that it has poor acid resistance because it contains acid, and both of them are air permeable. Furthermore, metal alkoxide-based coating agents must contain water necessary for hydrolysis, which shortens their pot life and makes it extremely difficult to use as a coating agent.
I have a problem.

The present invention was made against the background of such conventional technical problems, and its first purpose is to
For base materials made of paper, cement, and various other materials,
A coating composition that has good coating properties, can significantly improve the surface properties of the substrate such as water resistance, weather resistance, corrosion resistance, and heat resistance, and can be cured in a short time by heating at low temperatures. A second object of the present invention is to provide a film with high emissivity in the far-infrared region, a film with high emissivity in the near-infrared region, and a conductive film by blending various fillers. Another object of the present invention is to provide a coating composition for producing a functional inorganic paint capable of forming an electrically resistive film, a heat insulating film, a molten metal release film, a transparent cured film, etc.

[Means for solving problems]

That is, the present invention provides a tetraalkoxysilane represented by the general formula Si (OR)4 (wherein R represents a hydrocarbon residue having 1 to 5 carbon atoms), hydrolysis of the tetraalkoxysilane, (b) -1tlQ formula Zr ( OR')4 (wherein,
R' represents a hydrocarbon residue having 1 to 5 carbon atoms. ) at least one zirconium compound selected from the group of zirconium tetraalkoxides, hydrolysates of the zirconium tetraalkoxides, and partial polycondensates of the hydrolysates (hereinafter simply referred to as "zirconium compounds"). ) 3 to 30 parts by weight, [C) organic solvent 10 to 9 parts by weight
0 parts by weight, and 1 to 60 parts by weight of filler (fd) (provided that fal+(bl-NC1+(dl=100 weight@I) is mixed therein).

The present invention uses tetraalkoxysilane, Si(OR)4, whose hydrolysis progresses gradually due to moisture in the atmosphere, and zirconium tetraalkoxide, Zr(O), whose hydrolysis proceeds rapidly due to moisture in the atmosphere.
This was done based on the knowledge that a functional inorganic coating film can be formed by mixing a combination of R')4 with an organic solvent for concentration adjustment while adjusting the amount added, and further adding a filler. It is something that

Hereinafter, the present invention will be explained in detail for each component.

(a) Silane compound Tetraalkoxysilane used in the present invention; Si(O
R) 4 is hydrolyzed in the presence of water to form a hydrolyzate (tetrasilanol), and when this hydrolyzate is polycondensed to produce a partial polycondensate, and the molecular weight is further increased to form a coating film. It is cured by heating and acts as a binder together with the zirconium compound (b) in the composition of the present invention.

R in such tetraalkoxysilane is, for example, an alkyl group having 1 to 5 carbon atoms, such as methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, 5
Examples include ec-butyl group and tert-butyl group.

Specific examples of these tetraalkoxysilanes include tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane, tetra-1-propoxysilane, tetra-n-butoxysilane, and tetra-5ec.
-butoxysilane, tetra-tert-butoxysilane, and the like.

These tetraalkoxysilanes can be used alone or in combination of two or more.

Furthermore, among these tetraalkoxysilanes, tetraethoxysilane is particularly preferred.

In addition, such tetraalkoxysilane partially liberates alcohol by hydrolysis, producing a corresponding hydrolyzate (tetrasilanol), and polycondensation of the hydroxyl substituent by producing silanol occurs in an aqueous medium. , a partial polycondensate of silanol is produced, which is further polycondensed to produce a silica component which is a complete polycondensate.

Therefore, the silane compound (a) in the present invention includes not only the above-mentioned tetraalkoxysilane but also its hydrolyzate and partial polycondensate of the hydrolyzate. Such hydrolyzate and/or partial polycondensate may be produced from tetraalkoxysilane in the composition, or the hydrolyzate and/or partial polycondensate, for example, ethyl silicate 40 (manufactured by Colcoat ■) may also be blended.

The proportion of propyl group, n-butyl group, 5ec-butyl group, tert-
Butyl group, etc.

Specific examples of these zirconium tetraalkoxides include zirconium tetramethoxide, zirconium tetraethoxide, zirconium tetrapropoxide, zirconium tetra-1-propoxide, zirconium tetra-n-butoxide, zirconium tetra-5
Examples include ec-butoxide and zirconium tetra-tert-butoxide.

These zirconium tetraalkoxides can be used alone or in combination of two or more.

Among these zirconium tetraalkoxides, zirconium tetra-n-butoxide is particularly preferred.

The zirconium tetraalkoxide is rapidly hydrolyzed to liberate the alcohol and produce the corresponding zirconium tetrahydroxide, and the production of the hydroxide causes polycondensation of the hydroxyl substituent. ~60 parts by weight, preferably 3
If the amount is less than 5 parts by weight, the storage stability of the composition itself is good, but the adhesion of the resulting coating film will be weak, and the hardness will not be sufficiently improved. If it exceeds 60 parts by weight, the proportion of the zirconium compound becomes relatively small, and hydrolysis does not proceed in a short period of time, resulting in poor film-forming properties.

(b) Zirconium compound The (b) zirconium tetraalkoxide used in the present invention; condensation to produce a partial polycondensate,
When the molecular weight is further increased to form a coating film, it is cured by heating, and in the composition of the present invention, it acts as a binder together with the (al) silane compound.

R' in such zirconium tetraalkoxide is, for example, an alkyl group having 1 to 5 carbon atoms, and a partial polycondensate of, for example, a methyl group, an ethyl group, an n-propyl group, or i-hydroxide is formed, and further polycondensation As a result, a zirconia component, which is a complete polycondensate, is produced.

Therefore, in the present invention, the (bl zirconium compound) includes not only the zirconium tetraalkoxide but also its hydrolyzate and a partial polycondensate of the hydrolyzate. The polycondensate may be produced from zirconium tetraalkoxide in the composition, or may be blended in advance during composition preparation.

The proportion of such (bl) zirconium compound in the composition of the present invention is 3 to 30 parts by weight, preferably 8 to 16 parts by weight, and if it is less than 3 parts by weight, the proportion of (b) zirconium compound is relatively small. On the other hand, if the amount exceeds 30 parts by weight (bl), the storage stability of the resulting composition deteriorates because the proportion of the zirconium compound is too high, and the hydrolysis is too rapid. Film-forming properties are poor (both are unfavorable).

(c1 organic solvent The organic solvent is a dispersion medium for the filler which is the fdl1 particles described later, and also serves as a dispersion medium for the filler (a) silane compound and (b)
It is a concentration adjusting agent for zirconium compounds, and is also used to adjust the hydrolysis of components (a) and (bl).

Suitable examples of such organic solvents include alcohols, glycol derivatives, or low-boiling organic solvents having a boiling point of 120° C. or lower.

Among these, examples of the alcohols or glycol derivatives include ethylene glycol, which is a monohydric alcohol or dihydric alcohol, or derivatives thereof. Among these, the monohydric alcohol is preferably an aliphatic alcohol having 1 to 8 carbon atoms. , specifically methanol,
Ethanol, n-propyl alcohol, i-propyl alcohol, n-butyl alcohol, 5eC-butyl alcohol, tert-butyl alcohol, n-pentyl alcohol, n-hexyl alcohol, 4-methyl-2-
Pentanol, 4-methyl-n-pentanol, etc. can be mentioned, and examples of ethylene glycol or its derivatives include ethylene glycol, ethylene glycol monobutyl ether, and 8M ethylene glycol monoethyl ether. These alcohols and glycol derivatives are preferably i-propyl alcohol, 5ec-butyl alcohol, n-propyl alcohol, n7'yl alcohol, acetic acid ethylene glycol monoethyl ether, and ethylene glycol monobutyl ether.

Further, examples of the low boiling point organic solvent having a boiling point of 120° C. or lower include toluene, henzene, acetylene, methyl ethyl ketone, cyclohexane, and tetrahydrofuran.

These organic solvents can be used alone or in combination of two or more.

In the composition of the present invention; (c) the proportion of organic solvent is from 10 to
90 parts by weight, preferably 15 to 35 parts by weight, and 10
If it is less than 90 parts by weight, the viscosity of the composition will increase too much and the storage stability will deteriorate, while if it exceeds 90 parts by weight, the storage stability of the composition itself will improve, but the solid content in the composition may decrease. It is not possible to achieve a thick coating film, and the rate of hydrolysis decreases, resulting in insufficient curing in a short period of time.

(dl filler The filler in the present invention has heat resistance, infrared radiation, conductivity,
It is used to exhibit various functions such as electrical resistance, cosmetics, and heat insulation.

Such fillers include, for example, general pigments such as inorganic pigments; particulate or fiber-like metals, alloys, and their oxides, carbides, or nitrides other than pigments; and M
(OR2) , (M is a metal atom other than silicon or zirconium, R2 is an alkyl group, n is an integer), and is a hydrolyzate of a metal alkoxide, specifically nickel, copper, stainless steel, Titanium oxide (TiOz), aluminum oxide (A j2z 03 ), chromium oxide (cr203), sillimite (A in 203 ・5iO
2), synthetic mullite (3Aβ203 ・2SiOz),
Mica, potassium titanate, iron oxide (Fe, O,), manganese oxide (M n 203, ), silicon carbide (S
i C), silicon nitride (Si3N4), synthetic pigment of cobalt oxide and alumina (coo-Aj2z 03)
, Q acid zirconia (zircon HzrO□ ・5io2
), copper oxide (cuO), tin oxide, antimony oxide, etc., but are not limited to these.

In addition, the average particle diameter of these fillers is 0.01 to 100
μm, preferably about 0.02 to 2 μm.

In addition, among these fillers, the average particle size is 0.02
Some become transparent when the thickness is less than μm.

For example, tin oxide, antimony oxide, aluminum oxide, etc.

The proportion of such a filler in the composition is 1 to 60 parts by weight, preferably 10 to 50 parts by weight; if it is less than 1 part by weight, the filler is too small and the function of the resulting coating film is reduced;
If the amount exceeds 0 parts by weight, the viscosity of the composition increases, and the proportion of the binder components (al and bl) decreases, resulting in a weaker adhesion of the resulting coating film to the substrate, and a decrease in hardness. This is not preferable as it does not improve sufficiently.

Among these +d) fillers, titanium oxide, aluminum oxide, chromium oxide, sillimite, synthetic mullite, zirconia silicate, iron oxide, manganese oxide, copper oxide, silicon carbide, silicon nitride, etc., as exemplified above, are particularly suitable. A coating film with excellent corrosion resistance can be obtained, but a highly pure one is desirable depending on the application.

Particularly when the resulting coating film is used for electrical resistance, the contamination of alkali metals is undesirable. In other words, if a material contains an alkali metal, it exhibits conductivity because alkali ions move when voltage is applied, and it does not return to its original state even after the voltage is removed, and further application of voltage causes dielectric breakdown. be.

In addition, the above-mentioned fillers such as aluminum oxide and chromium oxide have their own characteristics, so they can also be used for purposes other than corrosion prevention and electrical resistance.

For example, (d) a filler containing two or more powders such as zirconia silicate, aluminum oxide, titanium oxide, and chromium oxide has an emissivity of 0.9 in the far infrared region.
It becomes a coating film on the front and back or more.

Furthermore, (if two or more types of powders such as iron oxide, cobalt oxide, copper oxide, and chromium oxide are added as a dl filler), the coating film will have a high thermal emissivity.

Furthermore, when silicon carbide is used as a filler, a molten metal release film and an electrically resistive film with good thermal conductivity can be obtained.

Conversely, when metal oxides or metal nitrides are used as fillers, a film with good heat insulation properties can be produced.

Furthermore, a color film can be obtained by using yellow titanium oxide or green chromium oxide as a filler.

Note that the composition of the present invention comprises (a) to (d) as described above.
The optimal amount of organic solvent (c1) to be added varies depending on the material of the base material of the coating surface, and is determined mainly based on various conditions such as the surface area of the coating surface and water absorption rate. be done.

Therefore, one example of a preferred embodiment of the composition of the present invention is:
(a) Tetraethoxysilane as a silane compound, (b
) Zirconium tetra-n- as a zirconium compound
butoxide, (c1) i-propyl alcohol as an organic solvent, (d) a composition using mica as a filler,
When coating a metal or plastic substrate with a smooth coating surface and a small surface area with the composition of the present invention, the following composition is suitable.

Tal tetraethoxysilane; 18-24 parts by weight (b
l Zirconium tetra-n-butoxide; 6 to 8 parts by weight (c) i-Propyl alcohol; 58 to 66 parts by weight (dl Mica powder (scaly flakes, average particle size 1 to 1.5 μm) 1
0 to 15 parts by weight In addition, as a composition for coating the composition of the present invention on a substrate having a large surface area and a rough surface such as cement, paper, or wood, using the same components (a) to (d), , the following are suitable.

(a) Tetraethoxysilane; 32 to 48 parts by weight (b
l Zirconium tetra-n-butoxide; 11 to 16 parts by weight (cli) Propyl alcohol; 26 to 47 parts by weight (d) Mica powder (listed above); 10 to 15 parts by weight The composition of the present invention contains the above (a) ) to (dl components), and a small amount of acid may be added to these components in order to promote the hydrolysis of the (al silane compound and also to accelerate the curing of the resulting coating film).

Such acids include inorganic acids such as nitric acid and hydrochloric acid, acetic acid, formic acid, propionic acid, maleic acid, chloroacetic acid, citric acid, benzoic acid, dimethylmalonic acid, glutaric acid, glycolic acid, malonic acid, toluenesulfonic acid, These acids, which include organic acids such as oxalic acid, can be used alone or in combination of two or more.

The proportion of such an acid in the composition is about 0.01 to 1% by weight, preferably about 0.05 to 0.3% by weight, based on the entire composition.

In addition, in order to cure under mild conditions, the composition of the present invention may contain alkali metal salts of carboxylic acids, quaternary ammonium carboxylates, metal salts of carboxylic acids, amines, alkali metal salts, alkali hydroxides, etc. curing catalysts can be used.

When these acids and a curing catalyst are used together, for example, a mixed solution of 1 to 20 parts by weight of at least one of alkali metal salts such as nitrous acid, sulfurous acid, and aluminic acid to 100 parts by weight of acetic acid can be used according to the present invention. 0.05-0.
By adding about 5% by weight, the composition of the present invention can be cured (finished) in 3 to 10 days at room temperature, or in 1 to 3 hours when heated at 60°C.

Furthermore, when producing the composition of the present invention, other conventionally known additives such as organic pigments, various surfactants, silane coupling agents, titanium coupling agents, dyes, etc. can also be added.

In addition, although the heat resistance of the film decreases, in order to increase the density, the general formula R' S i (OR' ) 3 (where R3
represents an organic group having 1 to 8 carbon atoms, R4 is the above R or R
It is possible to add organoalkoxysilanes represented by (same as ).

When preparing the composition of the present invention, for example, (a) to
(d+acid components may be mixed at once, or (c1 to l)
(a) to (131) may be added to the mixed solution of dl, and usually the solid content [the amount calculated as the silica component of (a) + (
Amount calculated from bl as a zirconia component + ld) Total amount of filler] Concentration is 10 to 80% by weight, preferably 15 to 80% by weight
Adjusted to 50x4%.

The coating composition obtained according to the present invention can be applied to the surface of the target substrate by a coating method such as brushing, spraying, or dipping to a thickness of 0.5 cm in one coat.
It is possible to form a coating film with a thickness of about 50 μm, and it is possible to obtain a film thickness of about 1.5 to 150 μm with 2 to 3 coatings.

When the composition of the present invention is coated on a substrate, the composition absorbs moisture adhering to the substrate or moisture in the atmosphere, instantly or in a short period of time even at low temperatures from room temperature to about 80°C. It undergoes hydrolysis and becomes a sol due to the polycondensation reaction that occurs simultaneously, and as the reaction progresses further, it becomes a gel. In addition, when heated for about 10 to 60 minutes at 100 to 300°C, for example, zirconia silicate (SiZ) having a small amount of OH group
rO4) A glassy film of 10 fillers is formed, and when this is further heated to 550-650°C, OH groups disappear and 5i
It becomes a film of ZrO2 + filler.

This reaction is expressed, for example, by the following formula.

Filler +Si (OR)a +Zr (OR')4+
8H20-Filler+S i Zr (OH) s ”4
ROH+4R'OH filler+5iZr (OH)a-3iZrO, 10 filler+4H20 In this way, after coating the coating composition of the present invention on a substrate, it is immediately coated with, for example, 100~ Since a film can be formed by heating at about 300° C. for about 10 to 60 minutes, it is possible to improve workability.

The film obtained from the composition of the present invention has an electrical resistance value of 10" when a filler with an average particle size of 1 μm or less is used.
~10"Ω・cffl, and when layered to a film thickness of 100μm or more, the electrical resistance value becomes 1014Ω.
・It is possible to make it about cm. In addition, since it has excellent weather resistance, water resistance, and chemical resistance, it is effective when used in combination with other inorganic anticorrosion paints. When the composition obtained by the present invention is used in an outdoor structure such as concrete in a place that cannot be heated, it can be used by drying at room temperature for 3 to 10 days as described above. After 5 to 10 hours have passed, there will be no problem even if it gets wet in the rain.

Recently, there has been a demand for high-purity electrical resistance films for electrical and electronic components.
This requirement can be met if a highly purified metal alkoxide hydrolyzate represented by 1 is used.

In addition, (if two or more powders such as zirconia, alumina, titanium oxide, cobalt oxide, and chromium oxide are used as the DL filler, a highly efficient far-infrared emitting film can be obtained; By using two or more kinds of powders such as , cobalt oxide, manganese oxide, copper oxide, and chromium oxide, a film with high thermal emissivity can be obtained.

The composition of the present invention is applied to a substrate in one or more layers to form a coating film, and further coated with other coating compositions such as (a) to (a) as defined in the present invention.
The composition consisting of component (c) may be overcoated as a top coat.

[Effect]

The present invention uses Si(OR)4 and Zr(○R').

Focusing on the difference in the rate of hydrolysis of A membrane is created through a polycondensation reaction that occurs simultaneously.

That is, S i (OR)4 has a very slow hydrolysis rate and requires 1 to 7 days, whereas Zr(OR')4 is hydrolyzed in a few minutes.

For this reason, the composition of the present invention does not require any particular acid to promote hydrolysis and has extremely high purity, and by using a highly pure and functional filler, A functionalized coating agent is obtained.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.
The present invention is not limited to the following examples. In the examples, parts and percentages are based on weight unless otherwise specified.

Example 1 Compositions A and B shown in Table 1 were prepared to examine properties such as heat resistance, adhesion, spalling resistance, hardness, and electrical resistance.

(Margin below) Table 1 Next, a steel plate of size 50 x 50 x 1 mm (8
45C) Two sheets were prepared, and compositions A and B were applied to one side using an air spray gun so that the dry film thickness was 25 μm, and heated at 120° C. for 20 minutes. Furthermore, it was coated again in the same manner and heated at 150° C. for 30 minutes.

The total film thickness is approximately 50 μm. The test piece coated with Composition A was designated as A-1, and the test piece coated with Composition B was designated as B-1. Table 2 shows various test results using these two test pieces.

The various test items in Table 2 were measured in accordance with the following.

〔hardness〕

Based on pencil hardness (JIS K5400).

[Adhesion ■～■]

Adhesion ■: Based on Cellotape peel test.

Adhesion ■: Based on tensile strength (JIS K5400).

Adhesion ■: Based on base eye test.

[Heat resistance ■～■]

Heat resistance ■: Hold at 1,400℃ x 120 hours in an electric furnace,
After cooling naturally, the condition of the coating film was observed.

Heat resistance ■: Hold in electric furnace at 1,200℃ x 240 hours,
After cooling naturally, the condition of the coating film was observed.

[Spalling resistance]

Heating at 600°C and cooling with cold water was repeated 20 times, and the state of the coating film was observed.

〔water resistance〕

After being immersed in tap water for 60 days, the state of the coating film was observed.

[Boiling water resistance]

It was boiled in tap water for 120 hours and the state of the coating film was observed.

[Electrical resistance]

Measured in accordance with JIS C1302.

Table 2 Example 2 Composition C shown in Table 3 was prepared to examine its performance as a top coat for curing resin coatings.

Table 3 Next, 50X50 with urethane resin paint applied to the surface
Composition C was applied to an X2 dragon size steel plate (545C) using an air spray gun and immediately heated at 90° C. for 30 minutes, resulting in a film with barbs with a thickness of two fins. The test results for this test piece are shown in Table 4. In addition, in Table 4,
Salt water spray resistance is determined by spraying 4% saline for 480 hours and observing the state of the coating film.

Table 4 (Note: In the hardness test, the hardness test before application of the composition of the present invention was 2H.) Example 3 In order to examine the waterproofness of concrete, composition C in Table 3 was used.
A composition was prepared by adding 0.03% sodium nitrite as a hardening agent.

Next, Composition C was applied to the entire surface of a 10100 x 100 x 50 size concrete block using an air spray gun, and the block was left outdoors 24 hours a day. Thereafter, it was coated again in the same manner and left outdoors for 48 hours. The amount of two coats is 120g per square meter.
Met.

The waterproof test results for this concrete block were as follows. That is, three concrete blocks were immersed in tap water for 30 days, and the weight change was measured. The water absorption rate is
All were below 3%.

Further, the results were similar for those immersed for 90 days, and the surface was visually inspected to be in a state that was completely unchanged from before the test.

Example 4 Composition E and Composition F shown in Table 5 were prepared as compositions for far-infrared emitting films.

Table 5 *1) Manufactured by San Nopco ■, ex922B Next, composition E was applied to one side of 50X50X2 Tsuru steel plate (345C) with an air spray gun, and after drying, the equivalent film thickness of C was 30
µm, heated at 120°C for 20 minutes,
Furthermore, Composition F was applied so as to impregnate it, and heated at 120°C for 30 minutes.
Heated for 0 minutes. The core thickness was approximately 30 μm.

The testability test results are shown in Table 6.

In addition, in Table 6, the spectral emissivity is JASCO@Awa's IR
Using the thermal emissivity measuring device that is an accessory device of the A-2 type external spectrophotometer, the wavelength 5 was measured at a temperature setting of 100°C ± 1.0°C.
The emissivity in the far infrared region of ~25 μm was determined.

〔Effect of the invention〕

As described above, the coating composition of the present invention uses metal alkoxide, does not contain alkali metals, can be made even more pure, and has excellent heat resistance and corrosion resistance. Able to provide high-purity electrical resistance films; ■ Able to provide highly efficient far-infrared emitting films with excellent heat resistance and weather resistance; and highly efficient heat-emitting films in all near-far infrared regions; ■It is heat resistant to over 1,000℃ and forms a dense film, so it can provide an excellent high-temperature oxidation prevention film. ■It can provide a concrete waterproofing film with excellent weather resistance and corrosion resistance. ■When used as a top coat for organic and inorganic coatings, it can improve hardness, weather resistance, and corrosion resistance. ■Heat resistance, weather resistance, water resistance, seawater resistance, organic solvent resistance, and acid resistance. It is possible to form a coating film with excellent properties and can be used to obtain a corrosion-resistant film that has a wide range of uses. It can be applied as a material, ■It can be hardened by low-temperature heating (so-called low-temperature sintering), and if a hardening agent is used, it can be hardened even at room temperature. ■Since the film itself is activated, it can be used as a raw material. Sintering is possible at around 1,100"C, which is considerably lower than the sintering temperature. [Phase] Non-flammable and does not generate gas even when heated. - Pot life does not contain water, so when kept tightly closed. It has many advantages, such as being stable for more than a year, and its industrial significance is extremely large.

Claims (1)

[Claims] (1) (a) A tetraalkoxysilane represented by the general formula Si(OR)_4 (in the formula, R represents a hydrocarbon residue having 1 to 5 carbon atoms), a hydrolyzate of the tetraalkoxysilane, and 5 to 60 parts by weight of at least one silane compound selected from the group of partial polycondensates of the hydrolyzate; (b) general formula Zr(OR')_4 (wherein R' has 1 to 5 carbon atoms; At least one zirconium compound 3 selected from the group of zirconium tetraalkoxide, a hydrolyzate of the zirconium tetraalkoxide, and a partial polycondensate of the hydrolyzate.
~30 parts by weight, (c) 10 to 90 parts by weight of organic solvent, and (d) 1 to 60 parts by weight of filler ((a) + (b) + (c) + (d) = 100 parts by weight) A coating composition characterized by being made by mixing.