JPH02141232A - Colored-ceramic coated steel plate and manufacture thereof - Google Patents

Abstract

PURPOSE:To ensure decorative coloring and functionality without damaging the matrix of a surface-treated steel-plate by executing the same surface treatment as normal coating pretreatment onto the metallic material, applying a ceramic coating agent having a specific composition and heating and curing the metallic material at a low temperature. CONSTITUTION:The same formation treatment as normal coating pretreatment is executed onto a surface-treated steel plate (hot dipping, electroplating) and an Fe, SUS, Al, Cu, Mg or Ti plate, and a ceramic coating agent is applied and baked. A substance mainly comprising an alkali silicate and ultrafine silica is used as the ceramic coating agent at that time, and 150-300 deg.C are favorable as a baking temperature. Accordingly, ceramic coating having substantially all decorative coloring and functionality (a hard film, hydrophilic properties, fingerprint resistance, heat resistance, corrosion resistance, chemical resistance, weather resistance, release properties, stain resistance, abrasion resistance, insulating properties and workability) except plastics and wood is enabled.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to surface-treated steel sheets and Fe, SuS, AA'
, Cu.

This article relates to a colored ceramic-coated steel plate in which a ceramic coating agent is applied to a Mg or Ti plate after the same surface treatment as the usual pre-painting treatment, and a method for producing the same.

Specifically, the present invention applies decorative coloring and functionality (hard coating, hydrophilicity, fingerprint resistance, heat resistance, corrosion resistance, chemical resistance, weather resistance, mold release properties) to virtually all articles other than plastics and wood. The present invention relates to a colored ceramic-coated steel sheet with a ceramic coating, which has excellent properties such as hardness, stain resistance, abrasion resistance, insulation properties, and processability, and a method for producing the same.

(Prior art) Painted steel sheets conventionally manufactured include surface-treated steel sheets and metal materials (F e + S u S + A l + M
After applying various surface treatments on the surface treatment (resin: acrylic, urethane, evoquin, phenol, melamine, fluorine resin, or a combination of these), Cr + Si + Z r + T as additives in mixed resin base
i + M O + A Jl! + S u S powder,
(Usually used as a mixture of Zn and its oxides, etc.)
, chromate film + resin coating and enameled steel plate. With resin coating and chromate film + resin coating, when applied on metal materials, - For boat fishing performance, it is corrosion resistant, but the coating film hardness is low (pencil hardness H to 3H'), easily scratched, and not hydrophilic. (contact angle is 40 to 9o0), poor heat resistance (discolors or burns when heated), and poor weather resistance and abrasion resistance (only fluororesins are good). In order to completely eliminate these drawbacks, metal powders and various inorganic substances have been added.

Considering that organic systems are the norm, there are limits to the improvement of various functionalities.

Enamel steel sheets have a glassy coating and have the various functional properties mentioned above, but the baking temperature is high at 400 to 800°C.
Workability is poor on the actual line. or.

The process is complicated, which increases the cost and makes it difficult to put it into practical use.○ (Problems to be solved by the invention) The present invention aims to solve the problems of the prior art as described above (problems with organic resin coating and enameled steel sheets). As a result of various research, 1 surface-treated steel sheet metal materials (Fe, SuS, Al,
After performing the same surface treatment as the usual pre-painting treatment on the (Cu, Mg, Ti plate), a ceramic coating agent of a specific composition is applied and heated and hardened at a low temperature of 150 to 300°C. We have completed a colored ceramic coated steel sheet and its manufacturing method, which has all the characteristics of having decorative coloring and functionality without impairing the color.

This will be explained in detail below.

(Means for solving fi! problem) The ceramic coating agent having the above specific composition has a pH of 1.
This is a strongly alkaline aqueous solution of No. 2. The characteristics of the metal material coated with ceramic coating include the following items. Pencil hardness 9H or higher, hydrophilic medium (contact angle 10' or less), heat resistance AV (can be used continuously at 350℃), corrosion resistance, chemical resistance,
Weather resistance, mold releasability, stain resistance, and abrasion resistance are comparable to or better than fluororesin coatings, insulation HV (film thickness of about 5 μm is comparable to that of glass), and it can be bent to a certain extent. and 15
The entire coating can be completed by baking at a low temperature of 0 to 300°C. Ceramic coating agents cannot be applied to some types of metal materials without pretreatment. Especially sensitive to alkaline aqueous solution, Al-plated steel sheet, Zn
With plated steel sheets, the coating reacted with the material surface during baking, causing blisters and flaking, making it impossible to apply the coating.

Also, for other materials, it is possible to apply a ceramic coating agent only by degreasing.

The physical properties of the paint film are not good enough. From these facts, it was found that applying the same surface treatment as the usual pre-painting treatment, applying ceramic coater, and baking at a temperature of 150 to 300 DEG C. was effective in bringing out the characteristics of the ceramic coat described above. In other words, iron is used as a base treatment.

Cu→phosphate film, Cr-based film, plating treatment.

SnS, Ti → Degreasing only, polishing (including hairline processing and blasting), Cr-based film, non-chromate film,
Plating treatment. Mg, A1. Al plating → C, r-based film,
Non-quamate film, anodic oxide film.

Sn-plated steel sheet, PB-plated steel sheet → Cr-based coating, non-chromate coating. Zn-plated steel plate → Cr-based film.

Non-chromate film and phosphate film. The treatment method is conventional spray treatment, roll coating treatment, or dipping treatment. Ceramic coating application methods are normal spray application (air spray, electrostatic).

Performed by airless) roll coating and dipping treatment. For baking, a normal drying oven, near-infrared, far-infrared, electron beam, etc. can be used. The baking temperature is 150 to 300°C, but preferably 1 color type ceramic coating agent is 20°C.
Roast at 0-250℃. A clear type ceramic coating agent can also be used in the same manner. That is, the manufacturing method is: metal material → degreasing (alkaline aqueous solution, solvent) - water washing (1 or more steps; no solvent) → pretreatment → water washing (2 or more steps).

fcy coating (no Cr-based film is used)→drying→ceramic coating application→baking→product, and can also be carried out on a coil coating line or batch processing line. The ceramic coating agent used in the present invention is disclosed in Japanese Unexamined Patent Application Publication No. 6
1-57654. This colored ceramic coated steel sheet can be used in the same fields as conventional coated steel sheets. Particularly in fields where heat resistance, stain resistance, weather resistance, insulation, and film hardness (pencil hardness of 5H or more) are required, conventional resin coating technology has a wide range of applications. In particular, when processed into soft materials such as Mg and AlV, they are less likely to be damaged, so their uses will expand. Also, 15
Since low-temperature baking of 0 to 300°C is possible, it can be used even if it is not a special heat-resistant steel plate such as an enameled steel plate or a specific steel plate with SuS%.

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

〔Example〕

1) Iron plate (material: 5S-41゜200 x 300
x 1) underwent complete phosphate chemical treatment in the following steps.

Degreasing (*1) → Water washing → Phosphate chemical conversion treatment (*2) → Water washing → Pure water washing → Hot air drying *1: FC-301 [Japan Parriki Rising ■],
Prepared bath at 2%, immersed at 60°C for 10 minutes *2: PB-880C Nippon Bar Rising 0 Vermilion]
.

Total acidity 25pt, 80~b 2) Stainless steel plate (Material: 5uS304, 200X3
00x1 Dragon) was subjected to coating chromate treatment in the following process.

Degreasing (*3) → washing with water → hot air drying → coating chromate treatment (
*4) → Hot air drying *3: FC-4360 (Japan Pargalizing ■)
Prepared bath at 2%, immersed at 60°C for 10 minutes *4: PM-R282 (Nippon Parkerizing ■)
Build a bath with 5%, roll coat paint 3) Aluminum plate (Material: A11050p, 2oOx)
300 x II blade) was subjected to chromate coating treatment in the following process.

Degreasing (*5) → Water washing → Chromate film treatment (*6) → Water washing → Pure water washing → Hot air drying *5: FC-315 (Nippon Parkerizing (Kikki))
Set up a bath at 2%, immerse at 65℃ for 5 minutes *62 AM-713 (Nihon Vercalizing (Scoop) 7%
4) Galvanized plate (EC, 200 x 300 x 0.8) was subjected to phosphate film treatment in the following process.

Degreasing (*7) → Water washing → Phosphate skin treatment (*8) → Water washing → Chromate treatment (*9) → Hot air drying *7: FC-
301 (Japan Bar Power Rising■) 2% bath, 55℃
×3 minutes soak *l:! : PB-3308C Nippon Parkerizing (Scoop) Total acidity 30pt, 65°C x 1 minute immersion 2 times: LN-621: Nippon Parkerizing U1] 2
%, immersion at 60°C for 2 seconds 5) Ceramic coating agent of patent claims 2 and 3 was applied with a roll to the test plates prepared under the conditions of Examples 1) to 4) above and baked. .

In other words, pre-treated board → ceramic coating (*
10) → Burning (*11) *10. *11: CRM-100 (Okuno Pharmaceutical Industry ■
] Stock solution, film thickness 4-5 μm. Baking temperature: 9180-230°C based on room temperature, 180-230°C x 20 minutes.

CRM-700C Okuno Pharmaceutical Industry■] Stock solution, film thickness 20-23μ Baking is done at room temperature between 90 and 250 degrees Celsius.

200-b [Comparative Example] The following ordinary resin-based paint was coated with a roll and baked on a test plate prepared with the same diameter as in Examples 1) to 4).

Acrylic paint: Water-soluble acrylic [Nippon Bar Power Ising ■, product name Perlene #4513] Urethane paint:
Water-soluble urethane [Nippon Parr Ising ■, product name Valle: /3975] Fluorine-based coating: Fluorobon-SC Dainippon Ink & Chemicals ■] Film thickness measurement: Permanmarve ES type, EC type (Kett).

Made by Fischer] used Use a pencil made with a grade of 4.

Contact angle: conduct tangle meter CA-P type [Kyowa Interface Science ■] used SST: carried out in accordance with JIS-Z-2371.

500 hours without crosscut Humidity resistance: 700 hours at 98% humidity and 50°C Acid resistance: 5% H, So, 72 hours immersed at room temperature Alkali resistance: 1%
NaOH room temperature immersion for 72 hours Heat resistance: 400'CX2
0 hour abrasion resistance: 1kgx using taper abrasion tester C8-10
lOOO Rotating Solvent Resistance: Soak in MEKk gauze and rub vigorously on the paint film. The condition of the paint film after 50 trips.

Weather resistance, Sunny Weather Meter 500 hours Color difference ΔE 2 or less Stain resistance Two-oil black marker coating. After leaving it for a day, wipe it off with a solvent (Kinlen).

Adhesion: Peel off cellophane tape at 1 square corner.

Boiling water resistance: Boil tap water and soak for 6 hours.

(Effect of the invention) As explained above, surface treatment f! 4im plate and metal material (
After performing the usual pre-painting treatment and the same shuttle surface treatment on the (Fe, SuS, Ad, Cu, Mg, Ti plate), it? j
Apply the ceramic coating agent of claim 2 to 150~3
Colored ceramic coated steel sheets can be produced by baking at 00°C, making them effective for use in the following fields.

O Civil engineering and construction field; wall materials, roofing materials, doors, guardrails,
It has excellent weather resistance, stain resistance, scratch resistance (hard coating film), heat resistance, and design compared to conventional coatings for balls, bridges, road markings, tunnel linings, etc. There is. Exhaust gas from automobiles.

Dirt due to dust is difficult to adhere to. In addition, it is easy to remove even if it adheres, so it remains beautiful and does not discolor easily, so it is effective in terms of safety and sustainability for equipment related to breeding routes.

0 inch rear field: Especially stain resistant, scratch resistant, 1II compared to conventional painted steel plates such as wall materials, kitchen related materials, floor related materials etc.
Because it has excellent heat resistance and design, it maintains its beauty for a long time, and because it is heat resistant, it is also excellent in terms of fire prevention.

Q Home appliances field: household equipment, antennas, heating and cooling equipment.

Compared to conventional painted steel sheets for kitchen equipment and outdoor lights, it has excellent stain resistance, weather resistance, heat resistance, abrasion resistance, fingerprint resistance, hydrophilicity, and design, so it maintains its beauty forever. In particular, it has stain resistance and hydrophilic properties, so it can prevent a decline in the reflectance of radio waves and light. It is also effective in preventing dew condensation.

0 Automobile field: Mufflers, wheels, and other parts for motorcycles and four-wheeled tables, etc. Compared to conventional plated and painted steel sheets, it has particularly high heat resistance, weather resistance,
Excellent stain resistance, scratch resistance, and design.

Claims (1)

[Claims] 1. Surface-treated steel sheet (hot-dip plating, electroplating) and Fe
, SuS, Al, Cu, Mg, Ti plate, a colored ceramic coated steel plate characterized by applying a ceramic coating agent and baking it. 2. The colored ceramic coated steel sheet according to claim 1, wherein the ceramic coating agent is mainly composed of Cercari silicate and ultrafine particulate silica, and the baking temperature is 150 to 300°C. 3. Surface-treated steel sheets (hot-dip plating, electroplating) and Fe
, SuS, Al, Cu, Mg, Ti plate is subjected to the same chemical conversion treatment as the usual pre-painting treatment, and then the ceramic coating agent according to claim 2 is applied and baked at 150 to 300°C. A colored ceramic coated steel sheet and a method for producing the same.