Water-Based High-Temperature Resistance Silicone Resin Coatings
The water-based high temperature Resistance silicone resin coatings (200℃~1000℃) formulated with SiOResin’s SiO-715 use specially designed molecular structure water-based silicone resin as the base material.
This formulation not only addresses the common issues with commercial silicone resin products but also carefully balances hardness and toughness. As a result, it achieves excellent overall performance, making it a well-rounded solution. The cured coating exhibits high hardness and density, ensuring excellent heat resistance, low permeability, and corrosion resistance. This effectively isolates the metal surface from external water, air, and salt, preventing environmental damage. Its high toughness ensures that the coating does not crack or peel in extreme environments (acidic, alkaline, salt spray, high and low temperatures), maintaining long-term protection for 20-30 years.
SiO-715 Silicone Resin Application Areas
- High-temperature-resistant water-based coatings for household appliances, cookware, stoves, fireplaces, ovens, kilns, flues, chimneys, automotive exhaust pipes, and engines.
- Weather-resistant and anti-corrosive outdoor metal water-based coatings.
- Water-based insulating coatings for household appliances (e.g.non-stick pan exteriors), electronic and electrical components as well electromechanical products.
- Ideal base material for preparing high-temperature water-based thermal insulation coatings, fireproof coatings, heavy-duty anti-corrosive coatings, thermal conductive coatings, and insulating coatings.
Formulation Recommendations
In order to obtain more details about water-based high-temperature silicone resin coatings, you can refer to the following recommended starting formulation. Specifically, this formulation is for a single-component baking type paint, which serves as a helpful guide for your reference.
Black Paste Formulation:
| Component | Parts by Weight | Function | Supplier |
| Deionized Water | 531.6 | ||
| Dispersant BYK-190 | 24 | BYK | |
| Anti-settling Agent BYK-420 (10%) | 18 | BYK | |
| Anti-settling Agent Bentone LT (2%) | 24 | Hemings | |
| Defoamer Foamex 810 | 2.4 | Tego | |
| Low-melting-point glass powder (350℃) | 200 | Increases high-temperature adhesion | |
| Mica Powder | 100 | Increases low-temperature adhesion | |
| Copper Chromite Black | 200 | High-temperature pigment | |
| High-purity Zinc Phosphate | 100 | Enhances boiling water and salt spray resistance | |
| Total | 1200 |
Pigment and filler content = 50%
Process:
- Add defoamer, anti-settling agents, and dispersant into deionized water, stir at 1000 rpm for 5 minutes.
- Add copper chromite black, mica powder, low-melting-point glass powder, and zinc phosphate, stir at 2000-3000 rpm for 45 minutes.
Black High-Temperature Coating Formulation:
| Component | Parts by Weight |
| Silicone Resin Emulsion SiO-715 | 100 |
| Black Paste | 20-67 |
| Anti-settling Agent (Bentone LT, 2%) | 4 |
| Anti-flash Rust Agent | 1 |
| Epoxy Phosphate (Adhesion Promoter) | 1 |
| Wetting Agent (Tego 4100) | 0.3 |
| Defoamer (Tego Foamex 810) | 0.1 |
| Thickener (Dow DR-50) | 1-2 |
Process:
- Disperse all components evenly at 1000-1500 rpm for 20-30 minutes and adjust to the appropriate viscosity. During the packaging process, it is essential to filter the mixture through a 200-mesh filter bag. This step not only helps to remove impurities but also ensures a higher quality product.
Notes:
- Adjust solid content with deionized water as needed.
- Adjust the pigment-to-binder ratio as required: a higher ratio results in lower gloss and better heat resistance; a lower ratio results in higher gloss, better salt spray resistance, and abrasion resistance. Use high pigment-to-binder ratio coatings as primer and low ratio coatings as topcoat for optimal results.
- Control single spray dry film thickness to 35-50 microns to avoid cracking. Each coat should be fully cured before you proceed to recoat it. This step is crucial because allowing adequate curing time ensures better adhesion and overall performance.
- Gradually raise the temperature for the initial use to allow the coating to complete secondary sintering under high-temperature conditions. Avoid placing unsintered workpieces directly in high-temperature environments to prevent coating cracking.
Construction Process:
- You should stir thoroughly before use, especially because the coating may settle over time. By doing so, you ensure an even consistency and optimal performance. Dilute with 5-10% deionized water if required, and test on a small scale first.
- Surface preparation: Remove oil and rust. For large-scale applications, enhance surface roughness through sandblasting, brushing, or grinding to improve adhesion.
- Application: Use high-pressure spraying. After air drying at room temperature, bake or low-temperature bake below 80℃ to accelerate surface drying. Avoid high-temperature baking of wet film directly to prevent bubbling.
- Baking: Fully cure under 200-280℃ for 10-60 minutes, preferably 220℃ for 30 minutes or 280℃ for 10 minutes.
Attention:
For the varying densities of high-temperature resistant materials, prolonged storage may cause settling. Before use, you need to stir the mixture thoroughly. Additionally, after you have finished using it, be sure to seal the container tightly to maintain its quality. In this way,we can prevent skinning and thickening of the coating. Clean spray guns and brushes with water promptly to avoid dried residue affecting future use.
High-Temperature Testing of Coatings
Foreign Competitor Comparison: *Using the same pigment, fillers, and additives, only substituting the resin; baked under the same temperature conditions.
| Foreign Competitor 1 | Foreign Competitor 1 | Foreign Competitor 1 | SiO-715 |
| 220℃/0.5h Cured Coating Appearance | |||
| Foreign Competitor 1 | Foreign Competitor 1 | Foreign Competitor 1 | SiO-715 |
| 220℃/0.5h Cured Coating Adhesion | |||
Summary:
Coating film is smooth and crack-free. Competitors 1 and 2 show no abnormalities after tape peeling and no exposure after scratching. Competitor 3 exhibits severe paint peeling and exposure after tape peeling. SiO-715 shows no abnormalities after tape peeling and no exposure after scratching, with adhesion rated 0.
| Foreign Competitor 1 | Foreign Competitor 1 | Foreign Competitor 1 | SiO-715 |
| 400℃/6h Baked Coating Appearance | |||
| Foreign Competitor 1 | Foreign Competitor 1 | Foreign Competitor 1 | SiO-715 |
| 400℃/6h Baked Coating Adhesion | |||
Summary:
Coating film is smooth and crack-free. As we can see, competitors 1 and 2 show no abnormalities after tape peeling, yet exhibit exposure and severe powdering after scratching. Competitor 3 shows severe paint peeling after tape peeling. SiO-715 shows no abnormalities after tape peeling and no exposure after scratching, with adhesion rated 0.
| Foreign Competitor 1 | Foreign Competitor 1 | Foreign Competitor 1 | SiO-715 |
| 600℃/4h Baked Coating Appearance | |||
| Foreign Competitor 1 | Foreign Competitor 1 | Foreign Competitor 1 | SiO-715 |
| 600℃/4h Baked Coating Adhesion | |||
Summary:
Coating film is smooth and crack-free. Competitors 1 and 2 show no abnormalities after tape peeling and no exposure after scratching. Competitor 3 shows severe paint peeling after tape peeling. SiO-715 shows no abnormalities after tape peeling and no exposure after scratching, with adhesion rated 0.
Conclusion:
Competitors 1 and 2 exhibit good adhesion after deep curing at 220℃/30min, yet show exposure and severe powdering after scratching at 400℃/6h, indicating poor heat resistance. At 600℃/4h, they show no abnormalities after tape peeling and no exposure after scratching, indicating good heat resistance. Competitor 3 exhibits severe paint peeling at 200-600℃ after tape peeling. SiO-715 shows no abnormalities after tape peeling and no exposure after scratching, with adhesion rated 0 and good heat resistance from 200-600℃.
High-Temperature Testing Comparison
Competitor 1 High-Temperature Test Comparison
220℃/0.5h | 400℃/6h | 600℃/4h
Conclusion 1: Competitor 1 shows severe discoloration after baking.
Competitor 2 High-Temperature Test Comparison
220℃/0.5h | 400℃/6h | 600℃/4h
Conclusion 2: Competitor 2 shows severe discoloration after baking.
Competitor 3 High-Temperature Test Comparison
220℃/0.5h | 400℃/6h | 600℃/4h
Conclusion 3: Competitor 3 exhibits severe discoloration after baking, with the original blue-black film.
SiO-715 High-Temperature Test Comparison
Conclusion: SiO-715 shows slight discoloration after baking.
High-Temperature Testing Conclusion:
Degree of discoloration after baking: SiO-715 < Competitor 2 < Competitor 3 < Competitor 1.
If you have any further questions, please feel free to contact our professional engineers for assistance. They are readily available to help you, and they will provide you with the support you need.
Best luck!