Why Do We Need Room Temperature-Curable High-Temperature Resistant Coatings? Typically, waterborne high-temperature resistant silicone resin coatings require high-temperature curing. This is because, under high temperatures, the silicone resin undergoes a cross-linking reaction, forming a dense coating structure that enhances its heat resistance, chemical resistance, and other properties. High-temperature curing usually occurs between 150°C and 250°C, depending on the chemical composition of the silicone resin and the intended application. However, there is also a demand in the market for low-temperature curing high-temperature resistant silicone resin coatings to meet specific application needs. For example:
- Substrate Temperature Limitations: Some substrates, such as plastics, composites, or certain metals, cannot withstand high temperatures. High-temperature curing may cause these materials to deform or become damaged. In such cases, low-temperature curing silicone resin coatings are a more suitable choice.
- Energy-Saving Requirements: In industrial production, high-temperature curing consumes a significant amount of energy. Low-temperature curing coatings can help reduce energy consumption and lower production costs.
- Ease of Application: In on-site construction or large-scale coating applications, high-temperature curing may not be practical or convenient. Low-temperature curing coatings can be cured at relatively lower temperatures, making them more suitable for on-site applications.
- Specific Application Needs: Certain specific applications, such as coatings for electronic components or protective coatings for optical devices, may be sensitive to temperature. In these cases, low-temperature curing coatings become a necessary choice.
Recommended: Room Temperature Curing Waterborne High-Temperature Resistant Silicone Resin Coating Formula
Our SIOResin® SiO-718 is a waterborne high-temperature resistant silicone resin emulsion that can cure at room temperature. You can use SiO-718 to prepare High-quality waterborne high-temperature resistant room-temperature curable silicone resin coatings. Please refer to the recommended starting formula below to prepare a two-component, room temperature curing black paint:
Black Pigment Paste Formula:
Ingredient | Weight (parts) | Function | Supplier |
Deionized Water | 531.6 | ||
Dispersant BYK-190 | 24 | Dispersant | BYK |
Anti-settling Agent BYK-420 (10%) | 18 | Anti-settling | BYK |
Anti-settling Agent Bentone LT (2%) | 24 | Anti-settling | Haimes |
Defoamer Foamex 810 | 2.4 | Defoamer | Tego |
Low Melting Point Glass Powder (350°C) | 200 | Enhances high-temperature adhesion | |
Mica Powder | 100 | Enhances low-temperature adhesion | |
Copper Chrome Black | 200 | High-temperature pigment | |
High Purity Zinc Phosphate | 100 | Enhances boiling water and salt spray resistance | |
Total | 1200 |
- Pigment and Filler Content = 50%
Procedure:
- Add the defoamer, anti-settling agents, and dispersant to deionized water. Mix at 1000 rpm for 5 minutes.
- Add copper chrome black, mica powder, low melting point glass powder, and zinc phosphate. Mix at 2000~3000 rpm for 45 minutes.
Room Temperature Curing Black High-Temperature Resistant Coating Formula:
Ingredient | Weight (parts) |
Silicone Resin Emulsion SiO-718 | 100 |
Black Pigment Paste | 20~67 |
Anti-settling Agent (Bentone LT, 2%) | 4 |
Anti-flash Rust Agent | 1 |
Defoamer (Tego Foamex 810) | 0.1 |
Thickener | 1.5~2 |
How to Procedure:
Directly disperse all ingredients until uniform at 1000~1500r/min,20~30 minutes. Filter with a 200 mesh filter bag during packaging.
Mixing Instructions:
- Before use, add the curing agent to the main components and mix thoroughly before application. The mixed coating must be used within 8 hours; otherwise, increased viscosity or gelation may render it unusable. Prepare the coating according to actual usage to avoid waste.
Notes:
- Recommended single-layer dry film thickness is 35~50 microns. Thicker layers may crack. Ensure the previous layer is fully cured before recoating.
- During initial use, gradually raise the temperature to allow the coating to complete secondary sintering. Do not place unsintered components in a high-temperature environment directly, as this may cause the coating to burst.
Room Temperature Curing High-Temperature Resistant Coating Application Process:
- Stir the coating thoroughly before use, as it may settle over time.
- Surface preparation: Degrease and derust the substrate. For large-scale applications, enhance surface roughness through sandblasting, brushing, or grinding to improve adhesion.
- Application: Use high-pressure spraying. After drying at room temperature for 7 days, test performance or accelerate curing by baking at temperatures below 80°C.
Precautions:
Due to varying densities of high-temperature materials in the coating, it may settle over time. Stir thoroughly before use. Close the lid of the packaging bucket promptly after use to prevent skinning and thickening of the coating. Clean spray guns and brushes with water immediately after use to avoid residue drying and affecting future use.
About SioResin
SiOResin boasts strong capabilities and can supply large quantities of high-quality pure waterborne silicone resin. If needed, please feel free to contact us.