What preparations should be made for spraying Teflon on the mold?
Mold surface treatment
Cleaning and degreasing: Use special cleaning agents (such as trichloroethylene, alcohol or neutral detergent) to remove oil, rust, dust and old coating residues on the mold surface. Ultrasonic cleaning or high-pressure water gun washing can be used to ensure that the surface is free of impurities.
Sandblasting/grinding: Sandblast the mold surface (80-120 mesh corundum is recommended), or polish with sandpaper (180-400 mesh) to form a certain roughness (Ra 1.6-3.2μm) on the surface to enhance the adhesion of the coating. After treatment, use compressed air to blow away the residual sand.
Inspection and repair: Confirm that there are no defects such as cracks and pores on the mold surface. If there are any, use welding or putty to repair them to avoid coating coverage defects that cause later shedding.
Environment and equipment preparation
Operation environment: in a well-ventilated dust-free workshop (or sandblasting room + paint spraying room), humidity is controlled at 40%-60%, temperature is 15-30℃, to avoid dust and water vapor affecting the coating quality.
Equipment tools: prepare spray gun (gravity or suction type, nozzle diameter 0.8-1.2mm), air compressor (make sure the compressed air is oil-free and water-free, and a filter needs to be installed), oven (temperature accuracy ±5℃), protective equipment (gas mask, high temperature resistant gloves, protective clothing).
Teflon coating preparation: select the appropriate type of Teflon coating (water-based or solvent-based) according to the mold material (metal, ceramic, etc.) and usage scenario (such as high temperature molds need to withstand more than 300℃), dilute according to the proportion in the instructions (usually add 5%-10% special diluent), stir evenly and let it stand for 10 minutes to remove bubbles.
