What are the gas purification solutions for metal and plastic coating in Dalian
* : * : admin * : 2024-10-31 13:48:04 * : 22
What are the gas purification solutions for metal and plastic coating in Dalian
According to the painting production process, painting exhaust gas mainly comes from pre-treatment, spraying, and drying processes. The pollutants emitted are mainly dust or acid mist generated during pre-treatment, paint mist and organic solvents generated during painting, and organic solvents generated during drying and volatilization. Paint mist mainly comes from the scattering of solvent based coatings during air spraying operations, and its composition is consistent with the coating used. Organic solvents mainly come from solvents and diluents during the use of coatings, with the vast majority being volatile emissions. Their main pollutants are xylene, benzene, toluene, etc. The harmful exhaust gases emitted during painting are mainly concentrated on the painting production line, among which the painting room, drying room, and drying room are the main sources of exhaust gases.
Spray painting exhaust gas treatment process: Spray painting exhaust gas mainly consists of two parts: liquid paint mist and gaseous VOC Regarding liquid paint mist, it is necessary to use paint mist removal equipment; But for insoluble VOCs, the mature industrial skill should still be the "activated carbon adsorption+photocatalytic oxidation desorption combined exhaust gas purification system" Biological bacteria filtration and purification equipment is now available.
What are the gas purification solutions for metal and plastic coating in Dalian
If the exhaust gas collection system adopts a fully enclosed gas collection hood or enclosed space, it should maintain a slight negative pressure state. The setting of exhaust hood (collection hood) for exhaust gas collection system should comply with the provisions of GB/T 16758. For those using external exhaust hoods, the control wind speed should be measured and controlled according to the methods specified in GB/T 16758 and AQ/T4274-2016. The control wind speed should not be less than 0.3 meters per second at the unorganized emission position of VOCs far from the opening of the exhaust hood. If there are industry requirements, the corresponding regulations should be followed.
Before applying any coating onto a steel substrate, surface pretreatment must be done to ensure good performance of the coating. Surface pretreatment not only includes steel cleaning, but also ensures the correct application conditions. Do not attempt to skip this step, as surface pretreatment is considered a key factor affecting the success of corrosion protection systems.
Dalian coating refers to the basic technical means used for surface protection and decoration of products by covering metal and non-metal surfaces with protective or decorative layers. The painting process can be simply summarized as pre-treatment, spray drying, or curing. Pre treatment generally includes oil removal, rust removal, and passivation (phosphating) processes. The selection of oil removal, rust removal, phosphating and other treatment methods for different coatings and corrosion resistance requirements depends on the condition of the workpiece raw materials. In the pre-treatment rust removal process, sandblasting, shot blasting or grinding processes are also selected according to the needs of different industries and departments.
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