The construction technology of surface spray painting in Stone Garden Decor processing is very important. The Stone Garden Decor manufacturer talks about the surface processing work of Stone Garden Decor.
1. The construction tools that need to be used in Stone Garden Decor processing include: air pump, air filter tank, air duct and spray gun, etc.
2. Construction
The cleanliness of the metal surfaces used in Stone Garden Decor processing seriously affects the bonding strength of the
stone sculpture. The remaining or adsorbed water, oil, and other foreign matter on the surface of the workpieces will not be completely eliminated, often resulting in pinholes, nodules, and peeling. Or malfunction such as poor combination.
①According to material considerations, after phosphating treatment, spray painting must be carried out in a timely manner within no more than 24 hours. Steel parts that have been sandblasted and shot blasted must also be spray painted within six hours. This technological measure for Stone Garden Decor processing is a good method proven in practice to help improve the adhesion between the coating film and the substrate and enhance its corrosion resistance.
The oil-water separation in the compressed air used for spraying is insufficient and incomplete, causing the compressed air to contain excess water and oil, which will inevitably affect the quality of the stone sculpture and cause various faults and defects. Therefore, what Stone Garden Decor processing workers can tell you is to insist on regularly cleaning and replacing the filters in the oil-water separation facilities and keeping the compressed air clean, which is beneficial to improving the performance of the stone sculpture.
②The temperature and humidity at the spray painting site have a very obvious impact on the quality of the stone sculpture. Attention should be paid to keeping the temperature of the construction site for Stone Garden Decor processing within the range of 10 to 30°C, and the relative humidity not exceeding 80%. The construction site must be kept clean, tidy and orderly.
If the temperature is too high and the relative humidity is high, the stone sculpture will easily turn white and appear orange peel-like. If the temperature is too low, the paint layer will flow easily, which will have an adverse effect on the quality of the coating on the metal surface.
③ Air spraying is generally used for spray painting on metal surfaces. Pay attention to keeping the distance between the spray gun and the surface to be sprayed within the range of 200~300mm, and controlling the compressed air pressure at 2~4kg/c㎡, so as to more effectively ensure the quality of the spray paint.
④ Select the type of coating according to the performance of the coating used in the Stone Garden Decor processing, the applicable environment and other conditions, so that the anti-corrosion protection effect of the spray paint coating can be more effectively exerted. The paint base, solvent and additives must be selected appropriately, the mixing ratio must be strictly in accordance with the process requirements, the mixing must be sufficient and even, and the dilution to the specified working viscosity must be ensured.
⑤The spray painting process in Stone Garden Decor processing generally adopts the method of spraying one coat of primer, one coat of middle paint and one coat of topcoat. When spraying nitrocellulose varnish once, because the primer and putty are oily and are easily melted by the thinner to produce bubbles and wrinkles, the spraying speed should be slightly faster. After spraying once, wait for it to dry and polish with water sandpaper before spraying again. Last time. The thickness of the primer should be no less than 75μm, the thickness of the mid-coat should be no less than 100μm, and the thickness of the topcoat should be no less than 50μm. After the painting is completed, the total dry paint thickness should be no less than 225μm.
⑥The requirements for surface painting of non-standard products shall be based on product technical conditions.
3. The later stage of Stone Garden Decor processing
After completion, according to common sense, the shelf life of spray paint is 2 years, but the environment is also an inducement for paint cracking; the organic components of structural materials oxidize and/or polymerize in high temperatures and air, resulting in thin layers of brown or black paint. shaped sediments, caused by the following reasons:
①stone sculpture age and naturally crack.
②Prevention and treatment of cracking of stone sculpture
(1) If the stone sculpture cracks due to aging, use a shovel to remove about 10 cm of the stone sculpture on both sides of the crack to expose the base material and find out the cause of the paint crack.
(2) Use putty to repair the cracks. After it is dry, use sandpaper to smooth it and make sure there is no debris. Apply the next coat of paint after it is completely dry. The first layer of topcoat should be thin and thin, and then apply the second layer after it dries.
(3) Do not apply thickly, and the total thickness should not exceed 150μm.
③ Precautions for Stone Garden Decor processing:
(1) If there is heavy rain during spraying, the constructed parts must be covered to prevent rainwater from washing away.
(2) When the temperature is below 5 degrees Celsius, it is not suitable for construction on windy or rainy days.
(3) When using multiple spray guns to spray the same spray surface at the same time, the same model of "gun plug" should be used.
