Besides the properties of the silica sol itself, the coating process is also crucial to the quality of the final product. Here are some key process parameters:
Coating Method: Common coating methods include dip coating, blade coating, spray coating, and microgravure coating. Different methods have different requirements for the viscosity and solid content of the silica sol, which must be selected according to production needs.
Drying Conditions: The coated diaphragm needs to undergo drying. Temperature, air velocity, and time all affect the uniformity and adhesion of the coating. Excessively high temperatures may cause cracking, while excessively low temperatures may prolong the production cycle.
Curing Process: Some silica sol coatings require further curing to improve mechanical strength, typically using heat treatment or UV curing. Insufficient curing will cause the coating to peel off, while over-curing may reduce the diaphragm's flexibility.