What are the requirements for the environmental temperature and humidity of the Teflon spraying process? The Teflon spraying process has been widely used for a long time, ranging from industrial industries to all aspects of life. A qualified Teflon spraying process can make the treated products look brand new. So do you know what requirements the Teflon spraying process has on the ambient temperature and humidity in the Teflon spraying process? Come together:
The suitable temperature for spraying is 18~25℃. The temperature should not exceed 30℃. The temperature of the surface to be coated is required to be more than 3°C higher than the dew point. Too high or too low temperature will affect the drying process of the coating film.
If the temperature is too high, the solvent volatilizes too quickly, and the phenomenon of dry spray occurs during spraying; the two-component paint has a short activation time, the viscosity of the paint rises and dries quickly, resulting in scrap; the paint film is prone to orange peel, wrinkles, pinholes, bubbles, etc. abnormal. If the temperature is too low, the fluidity of the coating is poor, the coating is rough and the density is poor; the mutual solubility of each component of the coating becomes poor, the viscosity of the coating increases or local precipitation is easy to cause particles or pinholes.
The suitable humidity for spraying is 45%~70%. When the relative humidity exceeds 85%, it is not suitable for painting.
If the relative humidity is too high, it may cause condensation on the surface of the paint film, and dew on the surface will reduce the adhesion of the coating. The finish is dull and whitish. When the relative humidity is greater than 85%, the coating that is painted is likely to cause abnormal quality such as whitening, cracking, decreased adhesion, and coating peeling. The humidity of the construction environment is too high, the oil-water separator of the spraying equipment fails, the air is not filtered, and it is easy to produce air bubbles, pinholes and other defects; moisture is mixed in the paint, causing the pigment particles to aggregate, and pitting occurs after spraying. If the relative humidity is too low, the cleanliness of the workshop will decrease, and the defective ratio of impurities and wool will increase.
Relative humidity “R.H” refers to the content of water vapor in the air at a certain temperature, expressed as a percentage. When the relative humidity is 100%, it means that the air is saturated with water. When the humidity is not saturated, the air becomes cold, the relative humidity rises, and the temperature drops to when the air humidity is saturated (ie, RH=100%), and the temperature at which moisture begins to condense is called “dew point”.