Under environmental pressure, the painting workshop is a key focus of VOC regulation. Emission reduction is not a single point, but a full chain of "source—process—end".
In one sentence: Source-level water-based/low-VOC substitution, enclosed recovery during the process, and end-of-pipe RTO combustion—only the three layers combined can meet the standard.
I. Emission Standards
Coating VOC is regulated by national and local standards, with limits tightening year by year, placing compliance pressure on both OEMs and refinish enterprises. Emission accounting covers all stages of pretreatment, spraying, and curing.
Figure: Pretreatment, spraying, and drying are the main sources of VOC.
II. Source Reduction
Water-based coatings: Using water instead of organic solvents, VOC is significantly reduced.
High-solid coating: Reduce the amount of diluent used.
Powder coatings: Almost no VOC.
III. Process and End-of-Pipe
Stage
Measure
Process
Closed spraying, paint mist recovery, air reduction and concentration increase
End-of-pipe
Zeolite wheel + RTO combustion purification
Figure: Process recovery + end-of-pipe RTO, burning VOC completely to meet standards.
The maintenance side can also adopt: Use water-based/high-solid repair paint, closed paint mixing, and standardized exhaust gas collection, which ensures compliance and improves workshop safety.
Summary
Coating VOC control is a full-chain engineering effort: at the source, reduce emissions by using waterborne, high-solid, or powder coatings; during the process, apply enclosed spraying and paint mist recovery; at the end, purify with zeolite rotor + RTO combustion. The maintenance side can also achieve compliance and efficiency gains through waterborne paints and exhaust gas collection.
Frequently Asked Questions (FAQ)
How to reduce VOC emissions in automotive painting?
Take a full-chain approach: at the source, switch to water-based/high-solid/powder coatings to reduce usage; during the process, use enclosed spraying and paint mist recovery; at the end, use zeolite rotor + RTO combustion purification. Only by combining these three layers can standards be met.
What coatings are available for source emission reduction?
Water-based coatings replace solvents with water, high-solid coatings reduce thinners, and powder coatings have almost no VOC—all are mainstream routes to reduce emissions from the material side.
What is RTO?
Regenerative Thermal Oxidizer, which burns concentrated VOC at high temperature into carbon dioxide and water. It is a highly efficient end-of-pipe purification technology for painting.
Do repair shops also need to control VOC?
Yes. Various regions have environmental requirements for auto repair spraying. Using water-based/high-solid repair paints, enclosed paint mixing, and standardized exhaust collection is both for compliance and for workshop safety.
Why is process control important?
When the source cannot be reduced to zero, enclosed processes and paint mist recovery can greatly reduce fugitive emissions, and reduce the load and energy consumption on end-of-pipe treatment—offering high cost-effectiveness.
Kexin New Materials · Automotive Coating Technology Library | This article is technical Q&A content, for reference in selection and application
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