By-products derived from plastic processing and subsequent stages
Published Time：
2025-11-05
Except for the resin synthesis stage, during the injection molding, curing, heat processing, and waste disposal processes of formaldehyde-based plastics, new by-products will be derived due to thermal degradation and oxidation reactions.
Except for the resin synthesis stage, during the injection molding, curing, heat processing, and waste disposal processes of formaldehyde-based plastics, new by-products will be derived due to thermal degradation and oxidation reactions.
During the high-temperature injection molding and forming process, formaldehyde-containing resins will undergo slight thermal degradation, releasing aldehyde substances such as acetaldehyde and formaldehyde, especially when polyvinyl chloride (PVC) is processed in combination with formaldehyde-based additives, hydrogen chloride gas may also be produced, causing corrosion to the equipment. If the processing temperature is too high or the ventilation is poor, phenolic resins and amino resins will further decompose, releasing carbon monoxide, carbon dioxide, and a small amount of aromatic compounds (such as phenol derivatives) and hydrogen cyanide (only for amino resins).
Furthermore, when using paraformaldehyde (a formaldehyde polymer) as a raw material instead of formaldehyde aqueous solution, a small amount of formaldehyde vapor is produced during the drying polymerization process. If the tail gas treatment is not thorough, it will cause air pollution.
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