Processing of Steel Space Frames

Display of the Painting Effect of Space Frame Material Rods

Surface pretreatment: If there is oil stain, use alkali solution, solvent or emulsifier to clean; rust removal can be done manually, mechanically or chemically; finally clean the surface. Primer spraying: Mix the primer as required, spray 1-2 coats, and control the thickness. Intermediate paint spraying (if any): After confirming that the primer is dry, mix and spray 1-2 coats. Topcoat spraying: After the intermediate paint is dry, grind and clean, mix and spray 2-3 coats. Paint film quality inspection: Check the appearance, thickness and adhesion.

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Precautions for painting space frame rods

Environmental factors
Material preparation
Rod surface treatment
Construction process

Temperature: The ambient temperature of the painting operation should be controlled between 5 and 35℃. If the temperature is too low, the viscosity of the paint will increase and the fluidity will deteriorate, which will lead to uneven painting and prolonged drying time of the paint film, and may even affect the adhesion of the paint film; if the temperature is too high, the solvent will evaporate too quickly, which will easily cause defects such as pinholes and bubbles on the surface of the paint film.
Humidity: The relative humidity should not be greater than 85%. In a high humidity environment, water vapor is easily mixed into the paint film, causing the paint film to turn white and lose gloss, and even peeling and falling off after drying. Therefore, it is not suitable to spray paint in rainy days, foggy days and other weather with high humidity.
Ventilation: The workplace needs to have good ventilation conditions. On the one hand, it can timely discharge the solvent vapor generated during the spraying process to avoid the formation of flammable and explosive mixed gases and ensure construction safety; on the other hand, it can reduce the risk of construction workers inhaling harmful gases, and it is also conducive to the drying of the paint film.
Coating selection: Select appropriate coatings according to the use environment and design requirements of the grid rods. If it is indoors and the environmental corrosion is relatively mild, ordinary alkyd enamel can be used; if it is outdoors or in an environment with strong corrosive media, coatings with good weather resistance and corrosion resistance, such as polyurethane paint, fluorocarbon paint, etc., should be used. At the same time, attention should be paid to the matching use of primer, intermediate paint and topcoat to ensure good adhesion between the coatings.
Material inspection: Before use, check whether the type, model and specification of the paint meet the requirements, check the production date and shelf life of the paint, and avoid using expired or deteriorated paint. Also check whether the type of thinner matches the paint, and the amount of thinner should be strictly prepared according to the requirements of the paint manual.
Thorough cleaning: The surface of the rod must be thoroughly cleaned of impurities such as oil, dust, rust, and scale. Any residual impurities may affect the adhesion of the paint film to the surface of the rod, causing the paint film to fall off. For example, oil stains will prevent the paint from adhering firmly, and rust will continue to corrode the steel under the paint film, shortening the service life of the rod.
Surface roughness: Appropriate surface roughness helps to improve the adhesion of the paint film. Generally, the surface of the rod is treated by sandblasting, shot blasting, etc. to make the surface reach a certain roughness. However, the roughness should not be too high, otherwise gaps may be formed in the paint film, reducing the protective performance of the paint film.
Spray gun operation: The spray gun should be kept vertical to the surface of the rod, and the distance should be controlled at about 20-30cm. The movement speed of the spray gun should be uniform, generally 30-50cm/s. Too fast will cause the paint film to be too thin and uneven, and too slow will easily cause sagging.
Avoid paint film defects: Pay attention to prevent the occurrence of paint film defects such as leaking, sagging, pinholes, and bubbles. When spraying multiple layers, it is necessary to follow the prescribed time interval. The next layer of paint should be sprayed after the previous layer of paint is dry, otherwise problems such as biting the bottom may occur.
Spray gun operation: The spray gun should be kept vertical to the surface of the rod, and the distance should be controlled at about 20-30cm. The movement speed of the spray gun should be uniform, generally 30-50cm/s. Too fast will cause the paint film to be too thin and uneven, and too slow will easily cause sagging.
Avoid paint film defects: Pay attention to prevent the occurrence of paint film defects such as leaking, sagging, pinholes, and bubbles. When spraying multiple layers, it is necessary to follow the prescribed time interval. The next layer of paint should be sprayed after the previous layer of paint is dry, otherwise problems such as biting the bottom may occur.

Painting process of space frame rods

Surface pretreatment

Degreasing: If there is oil on the surface of the rod, it can be degreased by alkali cleaning, solvent cleaning or emulsifier cleaning. For example, soak the rod in alkaline solutions such as sodium hydroxide and sodium carbonate, and then rinse it with clean water.
Rust removal: Common rust removal methods include manual rust removal, mechanical rust removal and chemical rust removal. Manual rust removal is suitable for a small number of rods or local rust removal, and is polished with tools such as wire brushes and sandpaper; mechanical rust removal is more efficient, such as sandblasting and shot blasting, which can effectively remove rust and oxide scale; chemical rust removal uses acid solution to react with rust to remove rust, but it is necessary to pay attention to the subsequent neutralization, cleaning and other treatment steps to prevent residual acid from corroding the rod.
Cleaning: After rust removal, use clean compressed air or a brush to remove dust, rust residue and other impurities on the surface of the rod to ensure the surface is clean.

Primer spraying

Preparation of primer: According to the requirements of the paint manual, mix the primer and thinner in an appropriate proportion and stir them thoroughly.
Spraying operation: Use a spray gun to spray the primer evenly on the surface of the rod, generally spray 1-2 coats, and the thickness of each coat is controlled at about 30-50μm. During the spraying process, pay attention to the angle, distance and moving speed of the spray gun to ensure that the paint film evenly covers the surface of the rod.
Intermediate paint spraying (if any)
Primer drying check: Before spraying the intermediate paint, check whether the primer is completely dry. You can press the paint film lightly with your fingers. If there is no fingerprint residue and the paint film is not sticky, it means that the primer is dry.
Preparation and spraying: Prepare the intermediate paint in the same way and then spray it. The intermediate paint is generally sprayed 1-2 coats, and the thickness of each coat is controlled at about 50-80μm to increase the thickness and protective performance of the paint film.

Topcoat spraying

Intermediate paint drying inspection: After confirming that the intermediate paint is dry, use sandpaper to lightly polish the paint film surface to remove burrs and protrusions on the paint film surface to make the surface flat, and then use clean compressed air or a brush to clean the surface dust.
Mix and spray: Mix the topcoat and spray it. The topcoat is generally sprayed 2-3 times, and the thickness of each paint film is controlled at about 30-50μm, so that the total paint film thickness finally meets the design requirements. The color and gloss of the topcoat should meet the design and use requirements. After spraying, the paint film surface should be smooth, flat and uniform in color.

Paint film quality inspection

Appearance inspection: Observe whether the paint film surface is flat and smooth, and whether there are defects such as missing spray, sagging, pinholes, bubbles, cracks, etc.
Thickness detection: Use a paint film thickness gauge to detect the thickness of the paint film to ensure that the paint film thickness meets the design requirements. Generally, multiple detection points should be selected on each rod for measurement, and the average value should be taken as the paint film thickness of the rod.
Adhesion test: Use the cross-cutting method and other methods to test the adhesion of the paint film to determine whether the degree of adhesion between the paint film and the surface of the rod meets the requirements.

Spray Paint Photos Display

Photos
Videos

Display of the Painting Effect of Space Frame Material Rods

Precautions for painting space frame rods

Painting process of space frame rods

Surface pretreatment

Primer spraying

Topcoat spraying

Paint film quality inspection

Spray Paint Photos Display

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