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The automobile coating production line built before 2012 in my country mainly uses traditional solvent-based topcoats as paint materials, which lag far behind the current mainstream water-based paint processes in terms of environmental protection, safety, and quality, and exhaust emissions can no longer meet the requirements of "Volatile Organic Compounds".
Emission Control Standards" (DB61/T1061-2019), meanwhile, equipment runs under high load for a long time, serious aging, high failure rate, equipment operation and maintenance costs are rising year by year, which affects the production cycle and the appearance quality of high-end cabs.
Necessity of transformation
In terms of environmental protection, laws and regulations require the implementation of raw material substitution projects, process technology transformation projects, recycling and comprehensive treatment projects, and all companies are required to ensure stable and up-to-standard emissions in accordance with standard requirements.
In terms of quality, the solvent-based production line usually adopts natural wind, and the performance and quality of the paint film are restricted.
By increasing the constant temperature and humidity transformation of the spray booth, the process control ability is com" href="http://">improved .
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In terms of safety, the original sprinkler fire-fighting system is mainly carbon dioxide fire extinguishing, which has insufficient design and risks, and requires an open-type high-pressure water mist upgrade.
Through the upgrading and transformation of the coating water-based paint process, the production line has been improved in terms of environmental protection, safety and quality to comply with national laws and regulations and improve the market competitiveness of the company's products.
Water-based paint process transformation plan
The paint line can be divided into traditional solvent-based paint line and water-based paint line according to the paint materials.
In recent years, the national environmental protection policy has become more and more stringent.
Laws and regulations require the implementation of raw material substitution projects, process technology transformation projects, recycling and comprehensive treatment projects, and the State Council The "Twelfth Five-Year Plan for Air Pollution in Key Areas" approved and implemented on September 27, 2012 (Huanfa [2012] No.
130) puts forward VOC pollution control as an important part of the environmental impact assessment of construction projects for the coating and coating industry , To adopt strict pollution control measures: new motor vehicle manufacturing coating projects, water-based coatings and other low-VOC content coatings accounted for not less than 80% of the total coating usage.
The traditional solvent-based topcoat line emission standards can no longer meet the environmental protection standards, and the whole area of the spray paint must be used for the rotary adsorption concentration + RTO exhaust gas treatment process to achieve exhaust gas emission standards.
3.
The B1B2 water-based topcoat process requires pre-drying of the color paint.
3.
The 3C2B water-based topcoat process requires that the water-based intermediate paint be sprayed and dried before the topcoat is sprayed, that is, the cab can enter the topcoat and spray the water-based paint and varnish after the B-line spraying in the middle of the spraying.
3.
