*The drying process can be divided into different stages according to the physical properties of the coating film as long as the viscosity changes, surface drying, actual drying and complete drying.
*The drying time of the paint film is affected by factors such as the temperature, humidity, ventilation, and light of the surrounding environment. Therefore, a certain environment and equipment are required for the measurement, and it is carried out in a constant temperature and humidity room.
* Surface dry time: blowing cotton ball method, finger touch method
* Hard drying time: filter paper press method, cotton ball press method, blade method and thick layer drying method.
*National standard GB/T 1728-88 Determination of drying time of paint film and putty film
- drying time
* The automatic drying time measuring instrument continuously observes the track of the needle-type drying time measuring process during the entire drying process
*According to the curing process of the coating film, it can be seen that the drying time of the coating film is not only affected by environmental factors, but also mainly affected by the curing crosslinking reaction properties of the film-forming material, the type of curing agent, the volatilization speed of the solvent, and the polymer segment effect .
*Drying too fast will cause wrinkling of the coating film, low gloss, low adhesion and other problems.
