JPH02129269A - Inorganic coating composition - Google Patents

Abstract

PURPOSE:To prepare an inorg. coating compsn. capable of forming, on all articles except plastic articles, a decorative colored coating film which can be easily freed of oil stain, inhibits the adhesion of a sticker and has hydrophilicity and mildew resistance by compounding a specific inorg. binder composn., an inorg. fibrous powder, and a colorant. CONSTITUTION:100 pts.wt. (solid base) inorg. coating binder obtd. by melt mixing 100 pts.wt. (solid base) potassium silicate and 20-50 pts.wt. ultrafine particulate silica in a molar ratio of SiO2 to KOH of 4.0-5.3 is compounded with 1-10 pts.wt. inorg. fibrous powder (e.g., potassium titanate whisker) and 10-50 pts.wt. colorant (e.g., rutile type titanium oxide) to give an inorg. coating compsn. The resulting compsn. is capable of forming a decorative colored coating film on all articles except plastic articles, and the coating film can be easily freed of oil stain, is hardly stained with finger prints, inhibits adhesion of a sticker and is excellent in hydrophilicity, mildew resistance, electrical insulation properties, and flexural and impact strengths.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to inorganic coating compositions. Specifically, it is useful for forming decorative colored coatings on virtually all items except plastics, and has oil stain removal properties, fingerprint prevention properties, sticker prevention properties, hydrophilicity, mold resistance, electrical insulation properties, and bending resistance. It relates to an inorganic coating composition that can form a film with excellent properties such as hardness and impact resistance.

Conventional techniques and their problems Inorganic paints obtained using conventional binders for inorganic paints (JP-A-61-57654, JP-A-62-278)
No. 280) not only requires a high curing temperature of 200 to 300°C, but also has extremely limited other curing conditions. For example, if the setting time after painting is prolonged and the coating is cured at a temperature of 1009C or lower in a hot-air heating oven, cracks that can be observed visually or minute cracks that cannot be observed will occur in the coating film.

These cracks significantly deteriorate the performance of the coating film, and in particular have an adverse effect on boiling water resistance, so the curing temperature cannot be lowered. Such cracks also have an adverse effect on the adhesion between the coating film and the material, particularly on flexibility.

Means for Solving the Problems The present inventor has conducted various studies in view of the problems of the prior art as described above, and has found that (i) a method containing an inorganic binder, an inorganic fiber fine powder, and a coloring agent of a specific composition. When using a coating composition and a coating composition containing a specific composition of inorganic binder, inorganic fiber fine powder, natural silicate fine powder, and coloring agent, it is possible to heat cure at a low temperature of 200°C or less. (11) Decorative colored coatings can be applied to all articles, including paper, without any restrictions on the curing conditions, and (iii) The resulting coatings are heat resistant and abrasion resistant. , high hardness,
It has particularly excellent boiling water resistance, corrosion resistance, weather resistance, solvent resistance, etc., and also has effects such as oil stain removal, fingerprint prevention, sticker prevention, hydrophilicity, dew condensation prevention, mold resistance, and electrical insulation properties. In addition to these effects, the present invention was also completed based on the discovery that the present invention has a rust-preventing effect on metal products.

That is, the present invention provides: (1) (a) silica/potassium oxide molar ratio of 4.0 to 4.0, obtained by heating and dissolving 20 to 50 parts by weight of ultrafine particulate silica to 100 parts by weight of potassium silicate (solid content); 5.
An inorganic coating composition containing 100 parts by weight of binder for inorganic coatings (solid content) of No. 3, (b) 1 to 10 parts by weight of an inorganic fibrous fine powder, and (c) 10 to 50 parts by weight of a colorant (the present invention) and (2) (a) silica/potassium oxide molar ratio of 4 in which 20 to 50 polymerized parts of ultrafine particulate silica are heated and dissolved in 100 parts by weight of potassium silicate (in terms of solid content). .0~5.
100 parts by weight of inorganic paint binder (solid content equivalent) of No. 3, (b) 0.5 to 10 parts by weight of inorganic fibrous fine powder, (c) 10 to 50 parts by weight of colorant, and (d) Natural silicate fine powder. An inorganic coating composition (referred to as the second composition of the present invention) containing 3 to 15 parts by weight is provided.

In the present invention, the potassium silicate is not particularly limited, and any commercially available liquid potassium silicate having a silica/potassium oxide molar ratio of about 2.9 to 3.7 can be used.

Ultrafine silica acts as a curing agent in the coating composition of the present invention. This ultrafine particulate silica has silanol groups (Si-OH) on its particle surface or partially inside, is soluble in alkali metal silicate, and has an average particle size of 4.
It refers to something with a diameter of about 0 μm or less.

As ultrafine particulate silica, for example, white carbon (
wet product made from sodium silicate), ultrafine anhydrous silica (dry product made from silicon halide)
Any commercially available one called by the ship's name, such as - can be used.

The amount of ultrafine particulate silica to be blended is approximately 20 to 50 parts by weight per 100 parts by weight of potassium silicate (in terms of solid content). If it is less than 20 parts by weight, the resulting coating film will have insufficient boiling water resistance, while if it exceeds 50 parts by weight, cracks and poor adhesion will occur in the coating film.

When producing an inorganic paint binder, water can be added in addition to the above two components.

Addition of this water facilitates mixing and dissolving the ultrafine particulate silica in potassium silicate, thereby improving workability when applying the composition of the present invention.

The upper limit of the amount of water added is about 200 parts by weight per 100 parts by weight of the solid content of the mixture of potassium silicate and ultrafine silica, and preferably the viscosity of the mixture is 1. H, S, NK-2 at 25°C within a range of 10 to 20 seconds.

The inorganic fiber fine powder (average fiber length of 1 to 20 μm, fiber diameter of about 0.1 to 1.0 μm) used in the present invention has the effect of preventing cracks in the coating film and increasing the adhesion with various materials. .

Examples of the inorganic fiber fine powder include fine powders such as potassium titanate whiskers, alumina fibers, silicon nitride whiskers, silicon carbide whiskers, glass fibers, carbon fibers, and silica-alumina fibers. Potassium titanate whiskers are preferred from the viewpoint of coloring degree, economical efficiency, etc., and potassium hexatitanate is especially preferred. As potassium hexatitanate, for example, one commercially available under the trademark "Tismo D" (manufactured by Daibutsu Chemical Co., Ltd.) can be used.

The amount of the inorganic fiber fine powder to be blended is usually about 1 to 10 parts by weight, preferably about 2 to 8 parts by weight, per 100 parts by weight of the inorganic paint binder (in terms of solid content). When the amount is less than 1 part by weight, there is no effect of preventing the occurrence of cracks, no improvement in adhesion to the material is observed, and good bending resistance cannot be obtained.

On the other hand, if it exceeds 10 parts by weight, the desired color tone that should be obtained by the coloring agent described later will be impaired due to its coloring power. Moreover, when a natural silicate fine powder is used in combination in the second composition of the present invention, the lower limit amount can be about 0.5 parts by weight.

As the coloring agent in the present invention, widely available inorganic pigments such as rutin-type titanium oxide, non-toxic pearl pigments such as mica-titanium oxide type pigments, etc. can be used.

The blending amount of the colorant is 10% of the solid content of the binder for inorganic paints.
Approximately 10 to 50 parts by weight is added to 0 parts by weight. 10
If it is less than the heavy mouth part, it may lack concealment properties, but on the other hand, if the
If it exceeds parts by weight, the continuity of the coating film obtained from the inorganic binder will be impaired, the boiling water resistance will be impaired, and it will be uneconomical.

The natural silicate fine powder used in the second composition of the present invention has a flat particle shape, is oriented parallel to the coating surface, and in order to restrain contraction and expansion of the coating film in the film surface direction, This can prevent cracks and improve adhesion. Furthermore, by using natural silicic acid fine powder in combination, the amount of inorganic fiber fine powder used, which is expensive and tends to impair the color tone of the paint, can be significantly reduced.

As a natural silicate fine powder, its particle size is approximately 10
Fine powder of less than μm in size, each with a shape of a hexagonal plate, a leaf, a flake, a scale, etc., can be widely used, including clays such as kaolin, talc, mica, and pyrophyllite. Examples include clay minerals such as.

The blending amount of the natural silicate fine powder is 3 to 15 parts by weight, preferably 4 to 10 parts by weight, based on 100 parts by weight of the solid content of the inorganic paint binder.

If the amount is less than 3 parts by weight, the amount of inorganic fiber fine powder cannot be reduced, whereas if it exceeds 15 parts by weight,
The coloring power of the natural silicate fine powder itself impairs the desired color tone and also impairs boiling water resistance.

The total amount of solid content of all components excluding the binder for inorganic paint is preferably 20 to 50 parts by weight based on 100 parts by weight of the solid content of the binder for inorganic paint.

If the strain is less than 20 times, appropriate conditions for coating cannot be obtained.

If it exceeds 50 parts by weight, the gloss of the coating film is reduced, the porosity of the coating film is increased, and stain resistance, boiling water resistance, etc. are deteriorated.

Box 1 and the second inorganic coating composition of the present invention can be obtained, for example, by the following manufacturing method.

Put a predetermined amount of potassium silicate and ultrafine particulate silica into a reaction container, stir at a temperature of about 80 to 100°C for about 1 to 2 hours to mix the ultrafine particulate silica and potassium silicate, and if necessary. For example, water is added to this to completely dissolve it to produce an inorganic paint binder.

Next, to the obtained inorganic paint binder, (1) predetermined amounts of inorganic fiber fine powder and colorant (first composition), or (2) inorganic fiber fine powder, colorant, and natural silicate fine powder (second composition) are added. composition) and homogenized by mixing in a stirrer or a ball mill for about 2 to 4 hours to obtain the first and second coating compositions of the present invention.

Effects of the Invention The composition of the present invention is particularly excellent in preventing cracking of the coating film, adhesion to various materials, and the like. In particular, this coating film crack prevention effect makes it possible to increase the blending amount of ultrafine particulate silica to potassium silicate, which suppresses the infiltration of water etc. through minute cracks, resulting in a temperature increase of 200°C. A coating film having sufficient water resistance can be obtained even at a low curing temperature below. In addition, the second coating composition of the present invention containing natural silicate fine powder can reduce the amount of inorganic fiber fine powder that is expensive and has high coloring power.
This is a more preferred composition.

Example EXAMPLES The present invention will be described in detail below with reference to Examples.

Example 1 Potassium silicate (trade name: Potassium silicate A, Nihon Kagaku Kogyo ■
100 parts by weight (solid content) of ultrafine particulate silica (
36.8 parts by weight of Nip Seal E-220 (trade name: Nip Seal E-220, manufactured by Nihon Shirikani Gyogyo ■) was added.

Add 195 parts by weight of water to 100 parts by weight of the obtained mixture and dissolve in a reactor for 2 hours with stirring at a temperature of 90 to 100°C to obtain an inorganic paint binder with a silica/potassium oxide molar ratio of 4.7. I got it.

Rutile type titanium oxide (trade name: Taibake R-
550, manufactured by Ishihara Sangyo Co., Ltd.) 26 polymerized part and potassium hexatitanate fiber fine powder (trade name: Tismo D, manufactured by Daiyu Chemical Co., Ltd.) added as an inorganic fiber fine powder, or a natural silicate fine powder added to this. Talc (trade name; Micro Ace ni-1, manufactured by Nippon Talc Co., Ltd.) or mica (trade name;
Mica Y-50001 (manufactured by Yamada Kogyo Co., Ltd.) was further added and mixed in a ball mill for 4 hours to homogenize, to obtain a composition of the present invention (Na 3.4.7.8).

For comparison, a composition containing only an inorganic paint binder (Nal), a composition containing a smaller amount of inorganic fiber fine powder than the specification of the present invention (2.6), and a binder and a natural silicate were used. Composition consisting of fine powder (No. 5
．． 9) was manufactured.

The contents of inorganic fiber fine powder and natural silicate fine powder in various compositions are shown in Table 1 below.

The obtained various compositions were divided into group ■ and group ■, and commercially available stainless steel plates (0.4X60X100+nm
) spray coated (coating amount 100-110g/m'
). For group (2), after painting, it was set at room temperature for 10 minutes, then the temperature was raised from 50°C to 180°C in about 15 minutes, and cured at 180°C for 30 minutes. ■For groups, do not set up immediately after painting.
The coated plate was placed directly into a curing oven at 80°C and cured for 30 minutes.

Various tests were conducted on the obtained test plates, and the results are shown in Table 1.

Test *Appearance of paint film: Visually observe the appearance of the paint film when cured by each curing method in groups ■ and ■.

A: No cracks or peeling is observed B: Fine cracks are present in the peeled part of the paint film C: Large cracks are observed D = Many cracks and peeling of the paint is also observed * Boiling water resistance: Boiling After being immersed in water for 24 hours, examine changes in the surface of the coating film A: No change at all B: Discoloration is observed C: The coating film peels off when rubbed with fingers *Based on CASS Test J 15-H-8681. Examining the state of the paint film after 720 hours A: No change at all B: Occurrence of red rust is observed C: Occurrence of red rust and blistering of the paint film is observed *Heat resistance:
After leaving it in an electric furnace at 400°C for 20 hours, examine the state of the coating film A: No change at all B: Discoloration C: Blistering and peeling *Adhesion: (Goban test) Peel off 1mm x 1+am cellophane tape. The remaining number (the number that did not peel off) was determined.

*Pencil hardness: The hardness of the coating film was examined using a Mitsubishi Pencil Uni. *Abrasion resistance: The amount of wear (mg) was measured using a 1000g x 1000 rotating Taber tester (C3-10).

*Weather resistance test: Using a Sunshine carbon arc lamp type weather resistance tester, the gloss retention rate (Δ
G) and the degree of discoloration (ΔE) were examined.

*Flexibility test: Check for peeling at the bent part when bent around an inner rod with a diameter of 0.5 mm with the painted surface outside. A: No peeling even after 180° bending B: 180° bending C: The composition of the present invention peels off when bent at 90°, but does not peel off when bent at 90°. As a result of the test, the composition of the present invention shows good film appearance, boiling water resistance, bending resistance, and adhesion, regardless of the curing conditions. Regarding etc.,
It showed excellent properties.

Example 2 Various raw materials were used in the proportions (parts by weight) shown in Table 2,
An inorganic coating composition was prepared as follows.

A binder for an inorganic paint was produced in the same manner as in Example 1. Potassium hexatitanate fiber fine powder (trade name: Tismo D, manufactured by Ohita Chemical Co., Ltd.), natural silicate fine powder (trade name: Micro Ace Ni-1, Japan) as a binder for inorganic paints as inorganic fiber fine powder. manufactured by Talc) and Burr pigment (trademark 4231 Iriodlne) as a coloring agent.
500 Bronze.

MERCK Co., Ltd.) and an inorganic pigment (trade name: Dipyroxide Black #9510, manufactured by Yongesei ■ Co., Ltd.) were added, mixed in a ball mill for 3 hours, homogenized, and the composition of the present invention (
Nos. 11 to 13) and compositions for comparison (No. 10
．． 14) was obtained.

The obtained various compositions were spray coated in the same manner as in Example 1, and after being set at room temperature for 5 minutes, the temperature was raised from 50°C to 160°C in about 15 minutes, and heat-cured at 160°C for 30 minutes. did.

The obtained test plate was tested in the same manner as in Example 1, and the results are shown in Table 2.

As a result of the test, the amount of ultrafine particulate silica was within the specified range (
When the amount is less than 20 to 50 parts by weight, there is a significant decrease in boiling water resistance, CAST test, and weather resistance, and when it exceeds the specified range, the appearance of the coating film is deteriorated. Furthermore, when the amount of water added when preparing the binder for inorganic paints was increased, the coating liquid tended to stick to the end surface of the test plate or flow during painting.

Example 3 Various raw materials were used in the proportions (parts by weight) shown in Table 3,
A composition was obtained as follows.

A binder for an inorganic paint was prepared in the same manner as in Example 1. Potassium hexatitanate fiber fine powder (trade name: Tismo D, manufactured by Ohita Chemical Co., Ltd.), natural silicate fine powder (trade name: Micro Ace Ni-1, Japan) as a binder for inorganic paints as inorganic fiber fine powder. Talc Co., Ltd.) and an inorganic pigment (trade name: Dipyroxide Greener #9320, manufactured by Ukima Gosei Co., Ltd.) as a coloring agent were added and homogenized by mixing in a ball mill for 4 hours to form a composition of the present invention (No.

16.17) and comparative compositions (No. 15.
18.19) were obtained.

The obtained various compositions were coated on an aluminum plate (A-1050
P anodized 5-10 μm (11 x 60 x 100 mm) was spray coated (total coating 100-110 g/m'). After setting for 10 minutes after application, heat from 120℃ to 20℃.
The temperature was raised to 0°C in about 20 minutes, and the mixture was heat-cured at 200°C for 20 minutes to obtain various test plates.

Various tests were conducted on the obtained test plate in the same manner as in Example 1. The results are shown in Table 3.

As a result of the test, when the total weight (heavy metal part) of inorganic fiber fine powder, natural silicate fine powder, and coloring agent is within the specified range (20 to 50 heavy metal parts) based on 100 parts by weight of the solid content of the inorganic paint binder, , flow occurred during painting, and the coating could not be formed (No.

15), On the other hand, if it exceeds the specified range, boiling water resistance,
Cath test decreased.

Example 4 1.0 part by weight of inorganic fiber fine powder (trade name: Tismo D, manufactured by Daibutsu Chemical Co., Ltd.) was added to 100 parts by weight (solid content equivalent) of the inorganic paint binder obtained in the same manner as in Example 1. , Natural silicate fine powder (trade name: Micro Ace-1,
Nippon Talc Co., Ltd.) 5.4 heavy metal parts and colorant pearl pigment (
Trade name: C1oisonne Red, MEARL
26.2 parts by weight (manufactured by Co., Ltd.) was added thereto, and the mixture was homogenized by mixing in a ball mill for 4 hours to obtain a composition of the present invention (No. 20).

This is a commercially available stainless steel plate SUS304 (0.8X5
00x500mm) with a coating amount of 90~1
00 g/rn'), and after being set in the chamber for 5 minutes after coating, the temperature was raised from 100°C to 200°C in 10 minutes in a curing oven, and heat-cured at 200°C for 30 minutes.

The obtained coated plates and non-coated plates (SUS304) were left for one month in an oil-splattered area of a deep-fried tofu processing factory.

Using a polyurethane sponge moistened with water or a neutral detergent, wipe the entire oil-stained test plate by moving it up and down 2 to 3 times, and check the contact angle of the water droplet on both test plates before the oil stain and after wiping the oil stain. The results are shown in Table 4.

Table 4 *-1) Panels were left in an oil-splattered area at a deep-fried tofu processing factory for 4 weeks *-2) *-1) Measurements were taken after cleaning (wiping off) the oil-stained panels with a polyurethane sponge dampened with water.

*-3) *-1) Measurement after cleaning (wiping) the oil-stained panel with a polyurethane sponge soaked in neutral detergent.

*-1) Measured immediately after alkaline degreasing of stainless steel plate.

The coated plate coated with the composition of the present invention was able to easily remove oil stains. After wiping again, unpainted board (SUS3
Although considerable scratches were observed in 04), there were no scratches on the painted board, and the painted board was as beautiful as before the oil staining, exhibiting excellent hardness and wear resistance.

Example 5 To 100 parts by weight (solid content equivalent) of the inorganic paint binder obtained in the same manner as in Example 1, 0.8 parts by weight of inorganic fiber fine powder (trade name: Tismo D, manufactured by Daibutsu Chemical Co., Ltd.) was added. , natural silicate fine powder (trade name: mica Y-5000M,
(Manufactured by Yamada Kogyo Co., Ltd.) 3.5 parts and colorant pearl pigment (
Trade name: 4232 I riodine 504, ME
28 parts by weight (manufactured by RCK) were added and mixed for 2 hours in a ball mill to homogenize, to obtain a composition of the present invention (No. 21).

Apply this to a commercially available glass cup by spraying the desired amount.
100 to 110 g/m'), and after setting for 5 minutes after coating, the temperature was raised from 80°C to 200°C in 15 minutes, and heat-cured at 200°C for 20 minutes.

The resulting coating showed a beautiful wine-colored pearlescent luster, and had abrasion resistance, high adhesion, and hardness (no scratches from nylon scrubbers, hardness: pencil hardness 9H or higher, adhesion: goblin test 100/100). , gloss = 60° specular reflectance 62%). Additionally, compared to non-painted glass tips, it is less prone to fingerprints and stains and maintains a beautiful surface.

Example 6 Compositions No. 4 of the present invention in Example 1 and commercially available acrylic paint were each spray-coated onto a commercially available cold-rolled steel plate (0.8 x 30 x 30 mm), and after the coating was allowed to set for 20 minutes, it was cured at 180°C for 30 minutes. did. For each coated plate, [Mold resistance test method (JIS Z2911-1981)]
A test was conducted in accordance with J mutatis mutandis.

Blue mold (Penici lliumf) was used as the test bacterial strain.
uniculosum I F 06345) and Aspergillus niger I
F 06341 ) and cultured at 28°C for 4 weeks. Mold growth was observed on acrylic paint. On the other hand, the composition of the present invention (Nα4) showed no growth and exhibited antifungal action.

Example 7 100 parts by weight of potassium silicate (in terms of solid content) and 40 parts by weight of ultrafine particulate silica (trade name: Nip Seal AQ, manufactured by Nippon Silikani Gyo Co., Ltd.) were mixed, and further 200 parts by weight of water was added per 100 parts by weight of this mixture. Add 90 parts by weight in the reaction vessel.
The mixture was heated and dissolved at a temperature of ~100°C for 2 hours with stirring to obtain an inorganic paint binder having a molar ratio of 4.9. To 100 parts by weight (solid content equivalent) of the obtained binder, inorganic fiber fine powder (trade name: Tismo〇, manufactured by Ohita Chemical Industry Co., Ltd.) 6
Parts by weight and 25 parts by weight of an inorganic pigment Titanium White (trade name: Taibake R-550, manufactured by Ishihara Sangyo Co., Ltd.) as a coloring agent were added and mixed in a ball mill for 4 hours to homogenize, resulting in a composition of the present invention (No. 22). I got it.

This was spray-painted on the satellite broadcast receiving system parabolic antenna (stainless steel 5US304), and after painting, the temperature was immediately raised from 60°C to 200°C in 15 minutes, and then 20°C.
It was heat cured at 0°C for 30 minutes.

When the coated parabolic antenna was left outdoors, its hydrophilic surface (contact angle with water droplets, 16') prevented condensation or water droplets from adhering to it during rain (which helped prevent interference with radio waves). understood.

Example 8 0.5 part by weight of inorganic fiber fine powder (trade name: Tismo D, manufactured by Daibutsu Chemical Co., Ltd.) was added to 100 parts by weight (solid content equivalent) of the inorganic paint binder obtained in the same manner as in Example 7. , natural silicate fine powder (trade name: mica Y-5000M,
5.5 parts by weight (manufactured by Yamada Kogyo Co., Ltd.) and pearl pigment (trade name: FLAMENCOGOLD, MERCK) as a coloring agent.
27 parts by weight (manufactured by Co., Ltd.) were added thereto and mixed for 2 hours in a ball mill to homogenize, to obtain a composition of the present invention (No. 23).

Spray this on the entire surface of the stainless steel plate (applying amount: 90-100g/rrll'), let it set for 5 minutes after application, raise the temperature from 130℃ to 180℃ in about 8 minutes, and then keep it at 180℃ for 30 minutes. It was heated and cured to create a beautiful gold metallic paint film. Next, a grinder was used to grind out the teeth by about 1.0 mm.

When we cut tofu, meat, vegetables, etc. with the resulting coated porcelain, the materials did not stick to the porcelain, and oils and other substances adhering to the porcelain were easily removed by washing with water or a light wipe, resulting in organic paint-coated products. There were no scratches on the painted surface as seen in . By using the coating composition of the present invention, it is possible to obtain a colored porcelain that is hygienic, easy to remove, has high hardness, and has a long life.

Example 9 Composition No. 12 of the present invention obtained in Example 2 was spray-coated on a commercially available stainless steel plate 5US304 (1 x 300 x 300 mm) (coating amount: 100 to 110 g/M), and after the coating was allowed to set at room temperature for 5 minutes, The temperature was raised from 150°C to 200°C over 5 minutes, and further heat-cured at 200°C for 30 minutes.

When a commercially available adhesive tape or paper with adhesive was attached to this painted board, it either did not stick or was easily peeled off even if it did stick. The composition of the present invention is also effective as an anti-sticking coating.

Example 10 Pearl pigments (a) to (f) (trade name;
(a) Trademark CLOISONNE Blue.

(o) CLO[5ONNE Supergreen,
(c) CLOISONNER Rouge Flam
be, (-1-) CLOISONNE Nu-A
ntigue Red, (E) 4217 1riod
ine300Goldstain.

(To) 45801riodinQRutilsilb
The composition of the present invention was obtained in the same manner as in Example 8, except that the following were used (No. 24, manufactured by MEARL).
．． 25.26.27.28.29).

Each composition was spray-coated onto a cemented carbide tool tip for color control (applying amount 50-60g/c), and after each coating was allowed to set for 5 minutes, the temperature at 40°C to 200°C was applied.
The temperature was raised to 'C over 20 minutes, and heat curing was carried out at 200°C for 20 minutes.

It was found that the composition of the present invention has excellent wear resistance, heat resistance during cutting, and resistance to machine oils, and color classification is also useful for management.

Example 11 Composition No. 12 of the present invention obtained in Example 2 was spray-painted on a commercially available thick Mino cover (coating amount: 90-100
g/a) and left at room temperature for 24 hours to obtain coated paper.

When we brought the flame of a gas burner close to this painted surface and investigated whether smoke was emitted, we found that the painted surface did not emit any flame until a thick blister appeared on the mating surface of the coated paper and it cracked, exposing the paper (approximately 30 seconds). Ta. Using the composition of the present invention, decorative colored paper with excellent heat resistance could be produced.

Example 12 Inventive composition No. 7 of Example 1 was applied to a commercially available stainless steel plate (SUS304.0.6X100X100nua).
Spray paint (ff180-90 g/m')
After painting, let it set at room temperature for 5 minutes, then raise the temperature from room temperature to 200℃ in 15 minutes, and then heat it at 200℃ for 30 minutes.
Cured by heating for minutes.

Regarding the obtained painted board, the dielectric breakdown strength (KV/mm
), surface resistivity (Ω) and dielectric constant, respectively, according to JIS C
2110, JIS C2103 and JIS K
Measured according to 6911 (measurement of dielectric constant by IMH
z, conducted at 20°C), 10KV/mm, 8. 5
X 10”Ω and e=9.6, tanδ=3X
10-2, and was found to be useful as an insulating material.

(that's all)

Claims (4)

[Claims] (1) (a) 20 to 50 parts by weight of ultrafine particulate silica is heated and dissolved in 100 parts by weight of potassium silicate (solid content), and the molar ratio of silica/potassium oxide is 4.0 to 5.3.
An inorganic coating composition comprising: 100 parts by weight of an inorganic coating binder (in terms of solid content); (b) 1 to 10 parts by weight of an inorganic fibrous fine powder; and (c) 10 to 50 parts by weight of a colorant. (2) (a) 20 to 50 parts by weight of ultrafine particulate silica is heated and dissolved in 100 parts by weight of potassium silicate (solid content), and the molar ratio of silica/potassium oxide is 4.0 to 5.3.
(b) 0.5 to 10 parts by weight of inorganic fibrous fine powder, (c) 10 to 50 parts by weight of colorant, and (d) 3 parts by weight of natural silicate fine powder. An inorganic coating composition containing ~15 parts by weight. (3) The total amount of components excluding the inorganic paint binder is
The inorganic coating composition according to claim 1 or 2, wherein the amount is 20 to 50 parts by weight based on 100 parts by weight of the binder. (4) The inorganic paint according to claim 1 or 2, wherein in the preparation of the binder for inorganic paint, an upper limit of 200 parts by weight of water is present per 100 parts by weight of the mixture of potassium silicate and ultrafine particulate silica. Composition.