1, brush coating method
Definition: Brush coating method is an ancient construction method.
Advantages: it has the advantages of simple tools, simple construction method, low construction cost, easy mastery, strong adaptability, saving paint and additives, etc.
Disadvantages: high labor intensity, low production efficiency, and construction quality depends on the skills of operators.
2. Roll coating method
Definition: the roller coating method is suitable for coating construction of rollers made of porous adsorption materials.
Advantages: This method has simple construction tools, convenient operation, higher construction efficiency than brush coating method, and is suitable for large-area members.
Disadvantages: high labor intensity and low production efficiency.
3, dip coating method
Definition: Dip the painted object in the jar, take it out after a while, and let the excess paint drip dry as much as possible before drying.
Advantages: simple construction method, less coating loss, and suitable for coating components with complex structures.
Disadvantages: sagging phenomenon, volatile solvent.
4. Air jet method
Definition: It is a painting method that uses the airflow of compressed air to bring paint into the spray gun, blow it into mist through the nozzle and spray it on the surface of the object.
Advantages: uniform and smooth paint film can be obtained, and the construction efficiency is high.
Disadvantages: it consumes a lot of solvents, pollutes the site and is toxic to construction personnel.
5, airless spraying method
Definition: It is a paint film formed by pressurizing the paint to a high pressure by a special hydraulic pump and dispersing it on the surface of the coated object at high speed when the paint is sprayed through a nozzle.
Advantages: high spraying efficiency, strong adaptability to paint, and thick coating can be obtained.
Disadvantages: If you want to change the spray width and quantity, you must replace the nozzle, which will also lose paint and pollute the environment to some extent.
Standard for coating thickness of steel structure
The current standard GB 14907_2002 "Fire retardant coatings for steel structures" in China stipulates that:
1, ultra-thin fireproof coating for steel structure: the coating thickness is less than or equal to 3 mm;
2. Thin fire retardant coating for steel structure: the coating thickness is greater than 3mm and less than or equal to 7 mm;
3. Thick fire retardant coating for steel structure: the coating thickness is more than 7 mm and less than or equal to 45 mm. ..
What is the paint price of steel structure?
It mainly depends on what paint is sprayed on your steel structure. If it is ordinary antirust paint, the price is not high. If it is fluorocarbon paint, the price should be higher.
After the general steel structure is polished and derusted, a layer of rust-proof zinc-rich primer is sprayed. If the quality requirements are strict, it is necessary to spray mica intermediate paint first, and then spray top paint. Topcoats are generally common topcoats and fluorocarbon paints. Ordinary paint is generally about one square 30 yuan, and fluorocarbon paint is generally about 50-80, not counting the labor cost.