After the material is painted, it develops a continuous coating film on the surface of the object, and the coating mold is firmly adhered to the surface of the object after drying. It can play the role of protection, decoration, marking, insulation, camouflage, etc. Applying paint to the surface of an object according to a certain process is called "painting". Its main functions are:
(1) Protective effect
Materials such as metal and wood are often exposed to the atmosphere, and are gradually destroyed due to erosion by moisture, salt spray, gas, microorganisms, ultraviolet rays, etc. in the atmosphere.
Applying paint on the surface of the object can isolate the corrosive substances from the outside, play the role of anti-corrosion, anti-fouling, anti-rust, anti-aging, and prolong the service life.
(2) Decorative effect
The paint has the characteristics of bright, beautiful, bright and bright, and pleasing to the eye. Buildings, wooden furniture, vehicles, etc. can change the original appearance of the object through the coating of paint, making it colorful and beautiful, and beautifying the living environment. The role of paint in beautifying the living environment cannot be ignored in people's material life and even spiritual life.
(3) Sign function
Paint by hand can bring obvious colors to various objects, so it can also play a role as a sign. Paints of different colors are commonly used on highways, railways, airports and other traffic lines to indicate warning, danger, passage and other signals. Chemicals and dangerous goods used in the factory can use the color of the paint as a sign. Various pipelines, mechanical equipment, containers, tank cars, electrical appliances, etc. are painted with various colors of paint as signs, which can make it easy for operators to identify and avoid operating errors. Road marking paint and railway sign paint play a very important role in ensuring driving safety and maintaining traffic order.
(4) Special role
Insulating coatings can play an insulating role in the electrical industry. The anti-fouling coating on the ship can kill or disperse the erosion of the marine organisms at the bottom of the ship to the hull, thereby ensuring the speed and prolonging the service life of the ship. Some coatings also have special functions such as anti-slip, oil-resistant, shatter-resistant, temperature-indicating, conductive, sterilizing, sound-proof, heat-insulating, moisture-proof, peelable, and camouflage.
