Powder Coating: Construction and Preservation

Construction Guidelines

General Requirements for Powder Spraying Construction

(1) To fully utilize the benefits of powder coatings and extend the lifespan of the coating film, it is crucial to perform thorough surface pretreatment on damaged coatings.

(2) During spraying, ensure that the object being coated is properly grounded to improve powder coating efficiency.

(3) For objects with significant surface defects, apply conductive putty to ensure a flat and smooth coating film.

(4) Following spraying, the objects must undergo proper heating and curing. Stick to the technical specifications provided by the powder product, ensuring adequate curing temperature and time to avoid quality issues caused by insufficient curing.

(5) Immediately inspect the coated surface after powder spraying. If any defects are found, address them promptly. For minor defects discovered after curing that only impact a localized area without affecting the overall appearance, use an acetone-diluted powder of the same color for repairs. If the defect is more extensive and affects the surface quality, polish with sandpaper before re-spraying or remove the coating using a paint remover and then reapply.

(6) Recycled powder must be screened to remove impurities before mixing it with new powder in a specific proportion.

(7) Prevent contamination of the powder supply barrel, powder spraying room, and recovery system by other powders of different colors. Cleanse them thoroughly when changing colors.

Artistic Powder Coating Construction Requirements: Artistic powder coatings possess beautiful appearances, strong three-dimensional effects, and excellent decorative qualities. However, they require strict adherence to construction techniques.

(1) Control the input air pressure during powder spraying, generally ranging from 0.5-1.5kg/cm2. Excessive air pressure can result in reduced pattern clarity or pitting defects. The electrostatic voltage should be around 60-70Kv. Higher voltage may cause powder to rebound and create pitting, poor leveling, or other defects.

(2) Pay attention to maintaining the appropriate thickness of the coating film during powder spraying, typically between 70-100 μm for distinct and larger patterns. A thin coating film will result in less noticeable patterns and smaller pattern sizes, along with defects like pitting and bottom exposure.

(3) During curing, follow the specified temperature and time guidelines. Insufficient temperature or curing time will prevent pattern formation and significantly reduce mechanical properties. Due to the unique production process of artistic pattern powder, patterns may become smaller or less pronounced when using recycled powder. It is generally recommended to avoid using recycled powder for artistic powder coatings and conduct testing before use. While these construction requirements are precise, mastering these factors during the painting process will yield satisfying results.

Storage and Handling of Powder Coatings

(1) Store powder coatings away from fire sources and direct sunlight in a well-ventilated area with a temperature below 35°C.

(2) Ensure the storage location is not susceptible to contamination by water, organic solvents, oil, or other substances.

(3) After using powder coatings, do not expose them to the air. Always cover or seal the bag to prevent debris from mixing in.

(4) Avoid prolonged skin contact. Wash off any powder residue on the skin with soapy water and refrain from using solvents.

Safety Measures at Coating Construction Sites

(1) Ground all equipment used in painting operations to eliminate static electricity.

(2) Take precautions to prevent unwarranted discharges from the coating machine.