Study on the Characteristics of Parylene Vapor Deposition Coating Process

Parylene is a high molecular polymer. It is a new coating material developed and applied by Union Carbide Co. in the United States in the mid-1960s. According to the different molecular structure, Parylene can be divided into Parylene N, Parylene C, Parylene D, Parylene F, HT and other types.

Parylene F

Parylene is a protective polymer material, Chinese name, Parylene, Parylene. It can be vapor-deposited under vacuum. The good penetrating power of Parylene active molecules can form pinhole-free inside, bottom and around the element. The transparent insulating coating with uniform thickness provides a complete high-quality protective coating for the component to resist the damage of acid and alkali, salt spray, mold and various corrosive gas parts. Because Parylene is not a liquid, it will not collect during the coating process. , Bridge-type formation of the meniscus.

Through the long-term application of Parylene vapor deposition coating process, Parylene Powder Supplier concluded that Parylene vapor deposition coating process has the following unique protective advantages:

(1) "Permeability"

Parylene coating film is prepared by a unique vacuum vapor deposition process. It is a conformal polymer film coating that is "grown" by active small molecules on the substrate surface. Because it is formed under vacuum conditions, the biggest feature of this process is "pervasive", which can be applied to surfaces of various shapes, including sharp edges, cracks and inner surfaces.

(2) can provide a true pinhole-free protective layer

The parylene deposition process is to heat and vaporize the xylene ring dimer, and then pyrolyze it into free gas-phase molecules, and then instantly adsorb and polymerize to form a film on the substrate under vacuum and room temperature. Protective film. Because the coating does not contain solvent, it overcomes the disadvantage that solvent-based coatings used in the past will leave many fine pinholes due to solvent volatilization during drying, which can provide a true pinhole-free protective film.

(3) A unique protective performance combining the independent protective performance of each local point with the overall protective performance

Because the parylene coating film is deposited as a reactive monomer with double radicals at normal temperature, the monomers are first deposited and attached to the substrate of the printed circuit board assembly, and then the active bonds of the monomers are bonded. Connected into a piece to form a whole film. Through long-term use, we have found that each point of the coating layer is an independent protection point. When the local coating is damaged, it will not seriously affect the protection of the coating in the surrounding area. At the same time, the points of the coating layer pass through again. The chemical bonds are connected together to form a whole, which further enhances its protective performance.

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