Draped
Why choose conformal coating
Protect the circuit board from short circuit and short circuit caused by moisture and pollutionConductor corrosion.
Water vapor will accelerate the phenomenon of corrosion and electron migration between conductors, while and will cause damage to uncoated circuit boards.
Scratch-resistant
Mechanical and thermal stress
Solvent resistance and antifouling
Keep the insulation of the circuit board
Types of conformal coatings
Acrylics acrylic resin
Epoxies epoxy resin
Urethanes polyurethane resin
Silicones Organosilicon
|
Material |
Advantages |
Limit |
|
acrylic |
Good electrical performance, hard, Good mechanical strength, transparent, UV resistant |
Poor solvent resistance, thermal stability Low resistance, flammable, medium or high unit price. |
|
epoxy resin |
Excellent electrical insulation, mechanical High strength, strong adhesion, high chemical resistance, room temperature or heat cure, medium price. |
General thermal stability, curing When the heat release is large, solidification��Shrinkage, poor oxidation resistance, toxic ingredients, electrical properties and temperature resistance will decrease when the flexibility increases |
|
Polyurethane |
Good electrical insulation, mechanical Strong strength, tough and wear-resistant, strong adhesion, thermal shock resistance, good low temperature stability, moderate softness or hardness, medium price. |
Poor high temperature stability, Sensitive to moisture and most solvents, not resistant to ultraviolet light, contains toxic ingredients, and is flammable. |
|
Silicone |
Excellent electrical performance, high and low temperature All are extremely stable, and can provide products with different hardness from soft gel to hard resin, water-based, anti-oxidation, anti-ultraviolet, thermal shock resistance, low toxicity, good chemical stability |
General mechanical strength, medium to the high unit price. |
Shin-Etsu coating material selection
（1）Solvent-free coating Covering material (overall covering)
KE-3421, KE- 4920, KE-3476, KE-4970, KE-4971
（2）Solvent-free coating Covering material (partial covering)
KE-441 , KE- 347
（3）Solvent-containing coating Covering material
KE-45-TS , KR-112V
Coating production process and cleaning
(1) Coating process
Dipping method
Manual spraying
Hand sag and brush
Machine spraying and vertical flow
topical application
(2) Cleaning process ( necessary)
Clean with plasma water
Solvent-free paint is recommended
Avoid using solvents in production
◦ Comply with environmental regulations
◦ Safety
◦ Non-toxic
◦ No waste disposal fees
Simplify the manufacturing process
◦ One-component formula
◦ No solvent dilution required
◦ Fast curing
Low cost
style="color:#000000"> ◦ Comply with environmental regulations◦ Safety
◦ Non-toxic
◦ No waste disposal fees
Simplify the manufacturing process
◦ One-component formula
◦ No solvent dilution required
◦ Fast curing
Low cost
微信扫一扫打赏
