Views: 1 Author: Site Editor Publish Time: 2022-11-29 Origin: Site
Polyvinylidene Fluoride (PVDF) coatings are factory-applied resin-based coating systems typically embedded with colored pigment particles to support a variety of matte finish colors. They are most commonly used in architectural coating applications due to their excellent resistance to weathering by sunlight, moisture or temperature.
Aluminum wall cladding, curtain walls and roof panels are some of the most common applications for PVDF coatings.
PVDF coatings belong to the family of fluorocarbon plastics that form bonds that are chemically and thermally stable. This enables some PVDF coating variants to consistently meet or exceed stringent requirements (such as AAMA 2605) with minimal fading over long periods of time. You may be wondering how these coatings are applied.
PVDF coatings for aluminum are applied by liquid spray guns in a paint booth. The following steps outline the complete process to achieve a high quality PVDF coating:
Surface Preparation - Any high quality coating requires good surface preparation. Good PVDF coating adhesion requires cleaning, degreasing and deoxidizing (rusting) of the aluminum surface. Quality PVDF coatings require a chrome-based conversion coating prior to primer.
Primers – Primers effectively stabilize and protect metal surfaces while improving adhesion of topcoats.
PVDF topcoat – colored pigment particles are added with the topcoat. The top coat is used to provide the coating with resistance to sun and water damage, as well as to increase abrasion resistance. The coating must be cured after this step. The top coat is the thickest layer in a PVDF coating system.
PVDF Clear Coat - In a 3-layer PVDF coating process, the final layer is a clear coat, which provides additional environmental protection and allows the color of the topcoat to pass through without damage. This coating must also be cured.
A 2-coat or 4-coat process can be used instead of the 3-coat method above if required for certain applications.
Key advantages of using PVDF coatings
Greener than dip coatings containing volatile organic compounds (VOCs)
Resistance to sunlight
Corrosion and chalking resistance
Maintain a high degree of color consistency (anti-fading)
High resistance to chemicals and pollution
Durable and minimal maintenance
Comparing PVDF and powder coating
The main difference between PVDF coatings and powder coatings is that PVDF coatings:
Use modulated fluid paints, while powder coatings use electrostatically applied powders
*Thinner than powder coating
* Can be cured at room temperature whereas powder coatings must be baked
* Resistant to sunlight (ultraviolet radiation), whereas powder coatings will fade over time if exposed
*Only available in matte finish, while powder coating is available in a variety of colors and finishes
* More expensive than powder coating, powder coating is less expensive, and can save additional cost by reusing overspray powder
Resin: Fluropolymer (PVDF), acrylamide resin
Pigments: metallic pigments, special pigments
Solvents: ketones, ethers
The end line is afraid of surface treatment: the painted surface should be painted with Flexprimer or Koexpon door by door
Analysis of the construction method of rural animal suction body: spraying
Coating film thickness: Wet coating film: 104~136um
Dry coating film: 25~UM
Drying time: 235 degrees Celsius * 10 minutes (P.M.T)
Thinner: ST-100, ST-707
Dilution viscosity: 20-25s, about the amount of Jing Ting on the block powder mixed with Erec (Ford#4, 25 degrees Celsius)
1. Avoid contact between PVDF paint and skin.
2, PVDF coatings are prohibited from being mixed with chemical coatings.
3. The remaining PVDF paint should be sealed and kept after use.
4. PVDF coatings are flammable and should be kept away from fire sources.
PVDF coatings should be stored in a clean and dry environment at 5~30°C to avoid contamination of dust, water vapor and other impurities.