Modification technology of silicone resin and application of functional coatings
Silicone resin, with its unique Si-O-Si main chain structure, combines the heat resistance of inorganic materials with the flexibility of organic materials. However, pure silicone resin has defects such as high curing temperature, low mechanical strength, and insufficient adhesion. Through modification technology, its comprehensive performance can be significantly improved, expanding its application boundaries in the field of functional coatings.


1、 Silicone resin modification technology: breaking through performance bottlenecks
The core of modification technology is to introduce other components through physical blending or chemical bonding, optimize the molecular structure and network density of silicone resin, thereby improving its key properties such as heat resistance, adhesion, and mechanical strength.


Organic polymer copolymerization modification
Epoxy resin modification: Through grafting condensation reaction between epoxy groups and silicon hydroxyl groups of silicone resin, a three-dimensional network structure is formed that combines high adhesion of epoxy resin and heat resistance of silicone resin. For example, epoxy organosilicon hybrid resin can maintain 85% of its original strength at a high temperature of 250 ℃, making it suitable for sealing components in aircraft engines.
Acrylic modification: Introducing acrylic groups can enhance the adhesion and water resistance of silicone resin, while reducing the curing temperature, making it suitable for photopolymerization packaging of precision electronic devices.
Polyester modification: By blending silica sol with polyester, organic silicon silica sol/polyester composite resin can be prepared, significantly improving the hardness and adhesion of the paint film, while improving flexibility.
Inorganic filler filling modification
Nano particle enhancement: Adding nano SiO ₂, carbon nanotubes, etc. can improve the hardness and thermal stability of silicone resin. For example, after nano SiO ₂ modification, the hardness of silicone resin can reach 6H (pure silicone resin is 3-5H), and there are no cracks after thermal shock at 600 ℃.
Flake filler barrier: The sheet-like structure of mica powder can effectively block heat transfer, and the organic silicon coating compounded with aluminum silver paste can be used for a long time in an environment of 500 ℃.
POSS nano additive: Polyhedral oligomeric silsesquioxane (POSS) increases the decomposition temperature of silicone resin by nearly 45 ℃ through chemical bonding and hydrogen bonding, significantly improving the high temperature limit.
Crosslinking density control modification
Chemical crosslinking: By introducing multifunctional silanes (such as methylphenylsilane) or crosslinking agents (such as metal organic acid salts), the crosslinking density of silicone resin is increased, and the hardness and chemical resistance of the paint film are improved.
Physical cross-linking: Using hydrogen bonding or van der Waals forces to form a reversible cross-linking network, endowing silicone resin with self-healing properties, suitable for protective coatings of flexible electronic devices.
2、 Application of Functional Coatings: From Extreme Environments to Intelligent Response
Modified silicone resin has shown broad application prospects in the field of functional coatings due to its excellent heat resistance, weather resistance, and chemical stability.


heat resistant coatings
Aircraft engine protection: The epoxy organic silicon hybrid resin coating can withstand high temperatures of 250 ℃ while maintaining excellent mechanical properties and sealing.
Industrial equipment coating: Organic silicon coatings with added aluminum silver paste and mica powder can be used for a long time in an environment of 500 ℃, suitable for insulation and corrosion prevention of high-temperature equipment such as chimneys and ovens.
Extreme environmental adaptation: Silicone resin coatings with high benzene content can maintain basic integrity at high temperatures of 1000 ℃, with only local carbonization occurring at 800 ℃, making them suitable for high-end fields such as missile antenna covers.
Wear resistant and hardening coating
Surface strengthening of substrate: Nano TiB ₂ - TiC composite coating can significantly improve the wear resistance of substrates such as cotton fabrics and metals, and maintain hydrophobicity after 1500 frictions.
Optical device protection: Low value methyl silicone resin (glass resin) has a hardness of 6H and a light transmittance of over 90% after curing, suitable for surface hardening of polycarbonate, organic glass and other products.
Anti fouling self-cleaning coating
Marine engineering protection: The fluorocarbon modified silicone resin coating has a surface contact angle of up to 150 °, excellent hydrophobicity and anti fouling performance, and is suitable for anti fouling coatings on ships and marine platforms.
Maintenance of building exterior walls: The superhydrophobic coating maintains 95% contact angle after 5000 water washes, significantly reducing cleaning costs.
Intelligent response coating
Temperature sensitive coating: By introducing temperature sensitive microcapsules or phase change materials, dynamic changes in coating color or adjustment of thermal conductivity can be achieved, suitable for flexible thermal interface materials in power battery packs.
Photosensitive reactive coating: Utilizing photochromic or photocatalytic principles, developing self-healing or air purifying coatings to meet the needs of smart homes and environmental protection.
Environmentally friendly coatings
Low VOC formula: By using water-based technology and environmentally friendly additives, the volatile organic compound content in the coating is significantly reduced, which is in line with the trend of green manufacturing.
Long term waterproof coating: Organic silicon waterproof coating has a service life of 10-15 years and is suitable for ancient building restoration and cultural relic protection.