Injection Molding
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Poor processability of PBT flame retardant modification
Problem Phenomenon
After adding flame retardants, the melt flowability of PBT decreases and the injection mold filling pressure increases.
Cause Analysis
The filling amount of flame retardants (such as brominated + antimony trioxide) is large (15-25%), increasing the melt viscosity; some flame retardants have poor thermal stability and decompose at high temperature.
Solution
Select high-efficiency flame retardants to reduce the filling amount; appropriately raise the processing temperature; add lubricating dispersants.
Key Takeaway
PBT flame retardancy needs a balance between flame retardancy and processability.
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