Summary:Commonly used coatings for vacuum plating include UV-curable coatings, acrylic coatings, alkyd resin...
Commonly used coatings for vacuum plating include UV-curable coatings, acrylic coatings, alkyd resin coatings, epoxy resin coatings, and polyurethane coatings.
(1) UV curing coating:
UV-curable coatings are coatings that are cured by chemical action under the irradiation of ultraviolet light with a wavelength of 250~450nm. feature is:
The coating does not need to be directly heated, as long as it cannot be cured by ultraviolet light, it can save energy, and the curing speed is fast, measured in minutes and seconds, and is suitable for automatic assembly lines; excellent coating performance, high coating adhesion, high coverage, and surface roughness Low, good vacuum performance, less solvent content, beneficial to environmental protection, etc.
This UV-curable coating mainly includes photosensitizer (photopolymerization initiator), photosensitive resin (prepolymer) and reactive diluent, as well as adding necessary stabilizers, leveling agents and pigments.
The photosensitive resin contains double bonds and can be cured to form a film by free radical polymerization. Selecting a suitable photosensitizer can shorten the curing reaction time and improve the performance and stability of the film. Commonly used photosensitizers are benzoin ethers. In recent years, the combination of thioxanthone compounds and N,N,-dimethylethanolamine can obtain extremely high hardness films.
Photosensitive resin contains double bonds that can carry out photopolymerization reaction. It is the main film-forming material in coatings, which determines the performance of the film layer. Commonly used photosensitive resins include vinyl type and acryl type.
Reactive diluents are monomers or oligomers containing unsaturated double bonds, which can not only reduce the viscosity of coatings, but also participate in photocuring reactions, and can form films together with photosensitive resins. Commonly used reactive diluents also include vinyl and There are two types of acrylic-based types.
Usually adding a leveling agent can improve the surface tension of the coating and promote the rapid leveling of the film layer. The commonly used leveling agents are cellulose and sorbitol surfactants.
(2) Acrylic paint:
Acrylic coatings are generally made of copolymer resins of methacrylate and acrylate.
Acrylic paint features: excellent color, good gloss retention, good color retention, moisture resistance, mildew resistance, solvent resistance, acid and alkali resistance, heat resistance, and can be used below 180 ℃.
(3) Alkyd resin coating:
Alkyd resins are resins that are co-esterified by polyols, polyacids and fatty acids. Coatings with alkyd resin as the main film-forming substance are called alkyd resin coatings.
Features of alkyd resin coating: It has excellent gloss, good gloss retention and color retention, and the coating layer is flexible and firm, and resistant to friction, but has poor resistance to salt spray, mildew and moisture.
(4) Epoxy resin coating:
Epoxy resin coating is a film-forming coating based on epoxy resin.
The characteristics of epoxy resin coatings: stable chemical properties, particularly strong alkali resistance, good adhesion of the coating layer, good thermal stability, electrical insulation and color retention, but poor weather resistance, easy to lose light, chalking.
(5) Polyurethane coating:
This paint contains a considerable amount of urethane bonds.
Features of polyurethane coatings: particularly strong wear resistance, excellent adhesion, extremely hard coatings and extremely flexible elastic coatings, chemically stable, dried at high temperature, and cured at low temperature, the coating has Excellent protection function, beautiful decoration, etc.Founded in 2007 as previous name Huahong Vacuum Technology,is professional China decorative vacuum coating machines manufacturers and decorative vacuum coating machines suppliers ,including but not limited to Sputtering Systems, Optical Coating Units, Batch Metallizers, Physical Vapor Deposition (PVD) Systems, Hard and Wear Resistant Vacuum Coating Deposition Equipment, Glass, PE, PC Substrate Coaters, Roll-to-Roll Machines for coating flexible substrates. The machines are used for a wide range of applications described below (but not limited to) Automotive, Decorative, Hard coatings, Tool & Metal Cutting coatings, and thin film Coating applications for industrial and Laboratories including Universities.Danko Vacuum Technology Company Ltd is committed to expand our market boundaries by providing high-quality, high-performance and wholesale decorative vacuum coating machines prices. Our Company is highly focus on after-sales service in Domestic and International markets, providing accurate part processing plans and professional solutions to meet customers need.