What is parylene?
It is a transparent and colorless polyester protective material. It is suitable for vacuum coating at room temperature, and the vacuum coating pressure is below 10-5 Torr, while the Parylene coating process is about 0.1 Torr. The thickness of the coating can be controlled between 1-100 microns. The coating is a patent developed by the United States in the early 1960s. It was first applied to the field of microelectronic components for US military printed circuit boards, aerospace and underwater launch devices, 1972 Included in the U.S. military standards in:
Micro and nano processing technology: chemical vapor deposition (CVD)
Put the powdered nano-materials into the evaporation chamber of the vacuum nano-coating equipment, and evaporate into gaseous molecules at a temperature of 150℃-180℃. Under the action of vacuum (1.0*10-2torr), the gaseous nanomolecules below 10nm enter into the cracking In the cracking chamber, the high temperature at 680°C-700°C is cracked into reactive monomers, and the active monomers and monomers are re-polymerized to form a dense and pinhole-free nano-film layer.
1.Circuit board coating:
Parylene vacuum vapor phase coating can enhance circuit embedding and eliminate surface moisture, metal ions and other pollutants. The function of resistance, thermocouple and other components is not changed in the coating. Parylene coating can protect sensitive components in engineering circuits.
Before Parylene is used, some (coating) wear centers can easily lose the insulation of magnetic windings. Parylene can not only overcome this defect, but also form a friction-resistant inner surface, which can accelerate the elongation and winding process, and at the same time increase ferrite The dielectric properties and high-voltage resistance of magnetic materials such as body can overcome the defects of non-abrasion resistance and acid resistance after ordinary epoxy resin spraying and hanging processes.
3. Medical Instruments
Parylene can provide a non-reactive, inert, high-temperature resistant, insulating, rust-proof and pinhole-free protective barrier. It is FDA compliant and suitable for a variety of applications, such as bone nails, temporary surgical instruments, replacement devices, catheters, brakes , Probes, pacemakers, vascular stents, needles and cochlear implants. Disposable medical supplies, hygiene products (paper gloves, waterproof paper sleeves, etc.).
4. LED outdoor lighting
Parylene can very effectively protect the functions of waterproof, moisture-proof, anti-aging, anti-corrosion and ultraviolet rays of LED products. Compared with the traditional technology, it is compared with the temperature shock test, the damp heat test, the sea water immersion test, and the corrosive liquid immersion test. The Parylene film has excellent protection functions that other films do not have.
5. Silicone Rubber
Use Parylene to coat a thin polyester generator film and a rubber ring seal in the gas cover to protect them from corrosion by chemical solvents and cleaning materials. In harsh environments, silicone rubber keyboards and other silicone products are coated with Parylene to increase the endurance of printing and improve its resistance to chemical moisture. Now more and more civilian rubber seals are also beginning to use Parylene coating for surface lubrication treatment, acid, alkali and moisture resistance and other protective treatments.
Parylene is an excellent three-proof material, its protective effect is better than silicone resin, epoxy resin and polyurethane. In recent years, coating Parylene on the surface of sensors has become a trend. Sensors protected by Parylene coating include automotive sensors, sensors for corrosive environments, biomedical sensors, acoustic sensors, biomedical electrodes, implanted sensors, etc. The protection of sensors by Parylene In addition to insulation protection, it is more used as a protection material for harsh environments. Parylene coating is resistant to acids, alkalis and organic solvents, and has excellent barrier protection against harsh environments such as water vapor and salt spray. The ultra-thin characteristic of Parylene coating will not change the appearance, size, elasticity, weight, etc. of the sensor.
Fragile cultural relics, specimens, etc. can be reinforced and protected with Parylene to extend their life. It is known as a new type of cultural relics protection material that can bring a revolution to the archaeological world, and can solve cultural relics protection problems that other materials cannot solve. Through Parylene vacuum coating, it can be moisture-proof, acid-proof, alkali-proof, anti-bacteria, anti-weathering, high temperature resistance, storage resistance, cold resistance, making its texture tough and preventing further damage to cultural relics. Parylene's unique ability can coat every fiber in the paper. Fragile artifacts can be reinforced and inspected to avoid further damage. As a protective material for precious photos or pictures, Parylene coating can greatly extend their lifespan without changing their appearance.
Parylene Coating Characteristics
Effective space: ⌀300*300mm
The appearance of the equipment is moderate with the volume of the vacuum chamber, the floor space is small, and the film uniformity is high. It is very suitable for use in laboratories such as research institutes and schools.