Silicone resin is widely used and critical in the field of high temperature resistant coatings. With its unique molecular structure and excellent properties, it has become an ideal choice for protecting substrates in high temperature environments.The following supplements its application situation in detail from the aspects of application scenarios, performance advantages, formula design, process optimization, etc.：


1. Application scenarios
Aerospace field
Engine components: Silicone resin coating is used in turbine blades, combustion chambers and other parts, which can withstand high temperatures of more than 1000℃ to prevent oxidative corrosion and thermal stress cracking.


Thermal protection system: A silicone coating is applied to the surface of the spacecraft's return capsule to resist the high temperature impact (about 1600℃) during re-entry into the atmosphere.


Industrial equipment protection
High-temperature pipelines and reactors: The inner walls of high-temperature pipelines in the chemical and metallurgical industries are coated with silicone coatings, which can withstand acid-base corrosion environments above 500℃ and extend the service life of equipment.


Kilns and heating elements: the inner wall coating of ceramic kilns and heat treatment furnaces improves heat resistance and heat insulation efficiency, and reduces energy consumption.


Automotive and energy sector
Exhaust system: Automobile exhaust pipes are coated with silicone coating, high temperature resistance (above 600℃) and corrosion resistance, reducing the erosion of metal by exhaust gas.


New energy batteries: In the battery thermal management system, silicone coatings are used for heat insulation and protection to improve safety.


2. Performance advantages
Excellent heat resistance
The Si-O bond energy in the silicone resin molecule is high (460.5kJ/mol), the thermal decomposition temperature exceeds 500℃, and some modified resins can withstand high temperatures above 1000℃.
The coating is not easy to decompose and carbonize at high temperatures, maintaining structural stability.


Excellent oxidation and corrosion resistance
The coating can isolate oxygen from corrosive media and prevent oxidation, vulcanization or carbonization of metal substrates.
Long-term use in harsh environments such as acid-base and salt spray (such as soaking in 5% brine for 70 hours without change).


Good mechanical properties
The coating has strong adhesion (up to H grade), high hardness (such as methylphenylsiloxane coating hardness up to 2H), and excellent impact resistance and wear resistance.
It still maintains flexibility at low temperatures and adapts to thermal expansion and contraction.


Environmental protection and construction convenience
The water-based silicone resin coating has low VOC emissions and meets environmental protection requirements.
Various processes such as spraying, brushing, dipping, etc. can be used, and the curing temperature range is wide (such as room temperature to 200℃).


3. Formula design
Resin modification
Phenyl modification: The introduction of phenyl to improve heat resistance and flexibility, such as methylphenyl silicone resin can withstand high temperatures of 600℃.


Organic-inorganic composite: it is combined with nano-silica, mica powder, etc. to improve the hardness and thermal insulation properties of the coating.


Pigment filler selection
High temperature resistant pigments: such as titanium dioxide, cobalt blue, etc., to improve the heat resistance and color stability of the coating.


Thermal insulation fillers: hollow microspheres, ceramic powders, etc. reduce the thermal conductivity and improve the thermal insulation effect.


Additive optimization
Add leveling agents and defoamers to improve construction performance, and the choice of curing agent affects the curing speed and coating hardness.


Fourth, process optimization
Surface treatment
The substrate needs to be sandblasted to Sa2.5 level to remove oil stains and rust marks and improve adhesion.


Coating process
Spraying: air spraying or airless spraying, pressure 3-4 kg/cm2, dry film thickness 50-60µm.


Curing: Bake after drying at room temperature (such as 120℃/30 minutes), or gradually heat up to 200℃ to cure.


Performance test
Heat resistance test: Hardness, adhesion and color changes are detected after high temperature baking.
Corrosion resistance test: salt spray test (such as 160 hours without rust), acid-base soaking test.


V. Application cases
700℃ silicone high temperature resistant paint
It is used for hot-end components of aviation engines, a two-component system, with excellent high temperature resistance and corrosion resistance.


Resistant to 600℃ high temperature resin (YS1056)
Self-drying liquid methylphenylsilyl resin at room temperature, suitable for civil equipment such as barbecue grills and automobile mufflers.


Water-based silicone high temperature resistant coating
The development of 600℃/3 hours high temperature resistant water-based coating, environmentally friendly and convenient construction, suitable for construction and industrial equipment.