Processing Machinery
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Severe screw corrosion during processing of flame retardant blend systems
Problem Phenomenon
Corrosion pits appear on the screw and barrel of halogen-containing flame retardant systems
Cause Analysis
Halogen-containing flame retardants decompose at processing temperature, releasing HX (hydrogen halide) acidic gas; the acidic gas reacts with metal at high temperature
Solution
Switch to halogen-free flame retardant systems (phosphorus-based, nitrogen-based, intumescent); use bimetallic corrosion-resistant screws and barrels; add acid absorbers (such as hydrotalcite)
Key Takeaway
The compatibility of the flame retardant system with equipment materials is the prerequisite for long-term stable production
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