The construction method of polyurethane anticorrosive coating mainly includes the following steps:
Surface treatment: First of all, the surface of the coated object needs to be treated to remove impurities, oil and rust on the surface. Surface treatment can be achieved through sandblasting, shot blasting, mechanical grinding and other methods to ensure that the surface of the coated object is smooth and flat. It is best to sandblast the surface of the steel to achieve SA2Grade 5 or manual mechanical rust removal to achieve ST3, the roughness of the steel surface formation should generally be controlled between 40-80 microns. The weld on the surface of the steel should be weld-free, angular, smooth, and spine-free.
Preparation for construction: Make sure the substrate is dry, clean, and free of oil stains, stains, and other impurities. Prepare the necessary construction tools, such as brushes, rollers, spray guns, etc. According to the application area and coating thickness requirements, calculate the required amount of paint.
Primer Coating: Primer is applied to a clean substrate to improve adhesion and durability. After the primer is dried, the next process begins. Please note that the surface of the steel should be primed within 24 hours after rust removal to avoid secondary rusting.
Primer coating: A midcoat is applied over a primer to improve the thickness and hiding power of the coating. The middle coat should be applied evenly to avoid bubbles and cracks.
Topcoat Application: A topcoat is applied over a midcoat to provide the desired abrasion, slip and oil resistance. The topcoat needs to be applied evenly to ensure that nothing is missed.
Coating curing: After the coating is completed, the coating needs to be cured to avoid direct sunlight and rain to keep the coating dry. Avoid stepping on or touching the coated surface for the specified time.
Please note that the paint should be stored in a cool, ventilated place, away from fire. It should be stirred well before use to ensure that there is no precipitation or delamination. During the construction process, personal protective equipment such as protective glasses and gloves should be worn. In case of ** contact, rinse with water immediately and seek medical attention in time. In case of eye contact, rinse immediately with plenty of water and seek medical attention.
In addition, the best application conditions for the paint are temperature 0-35, relative humidity 85%, or the surface temperature of the coated object should be higher than the ** temperature 3. Construction is not allowed in the presence of rain, fog, snow and heavy dust. After the first coat of paint is applied, it is best to wait for more than 24 hours before applying the second coat of paint.
Following the above steps can ensure that the polyurethane anticorrosive coating can exert its best anticorrosive effect. However, please note that the specific application method may vary slightly depending on the paint brand, substrate type, etc., so in the actual construction process, you should refer to the specific application guidelines provided by the paint manufacturer.