SP-E20 Epoxy Functional Silicone Prepolymer from Changfu Chemical: Upgrading the Performance of Conformal Coatings

In today's world of increasingly miniaturized and intelligent electronic devices, conformal coatings (for moisture, dust, and corrosion resistance) are becoming more crucial as the core protective material for circuits. SP-E20, an epoxy functional silicone prepolymer from Changfu Chemical, offers an innovative solution for the conformal coating industry. With its excellent chemical properties and process adaptability, it enables customers to create high-reliability, long-lasting electronic protective coatings.

Core Advantages

1. Dual Chemical Structure for Comprehensive Performance Upgrade

SP-E20 combines the high reactivity of epoxy groups with the flexibility of siloxane segments, forming a dense three-dimensional cross-linked network that gives conformal coatings the following characteristics:

- Superior Adhesion: The chemical bonding (Si-O-M) between silane groups and the hydroxyl groups on the substrate surface significantly enhances the adhesion of the coating to metals, plastics, ceramics, and other materials, preventing delamination caused by thermal cycling or mechanical stress.

- High-Temperature Stability: The high bond energy of Si-O bonds (452 kJ/mol) allows the coating to maintain stable performance in a wide temperature range of -50°C to 200°C, making it suitable for high-temperature scenarios such as automotive engine compartments and industrial equipment.

- Chemical Corrosion Resistance: The dense cross-linked structure effectively blocks the erosion of acids, alkalis, salt mists, and organic solvents, protecting PCB boards from damage caused by flux residues and industrial air pollution.

2. Moisture-Curing Technology for Efficient and Environmental-Friendly Process

SP-E20 supports room-temperature moisture curing, eliminating the need for high-temperature baking. This simplifies the production process and reduces energy consumption. Its low viscosity is compatible with various application methods such as spraying, dipping, and brushing, meeting the requirements of high-precision coating (e.g., thickness control of 0.05-0.15mm). Additionally, SP-E20 can be used in solvent-free or water-based systems, complying with RoHS and REACH environmental standards, reducing VOC emissions, and supporting green manufacturing.

3. Long-Lasting Protection

- Hydrophobic and Moisture-Resistant: The silane segments are oriented on the coating surface to form a low-surface-energy hydrophobic layer (contact angle > 90°), effectively preventing water vapor penetration and avoiding circuit short-circuits and metal oxidation.

- Anti-Aging Design: The siloxane network scatters ultraviolet light and inhibits oxidation reactions, delaying the yellowing and powdering of the coating and extending the outdoor service life of equipment.

Typical Application Scenarios

1. Consumer Electronics: Protecting PCB boards in smartphones and wearable devices from sweat, moisture, and everyday chemical contact.

2. Automotive Electronics: Coating ECU control modules and sensors to withstand temperature cycling, fuel vapor, and salt mist environments.

3. Industrial Equipment: Protecting circuits in harsh environments such as chemical plants and offshore platforms from acid-alkali corrosion and high humidity and salt mist.

4. New Energy Field: Ensuring long-term reliability of photovoltaic inverters and energy storage battery management systems in extreme temperature differences.