Material Analysis
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Dimensional change of EAA products during long-term storage
Problem Phenomenon
After 3 months of storage, the dimensions of EAA products change by ±2-3%, exceeding the ±0.5% requirement
Cause Analysis
EAA physical aging relaxation causes continuous dimensional change; secondary crystallization slowly changes density and dimensions; slow migration of low-molecular substances changes local density
Solution
1) Anneal products at 80°C/4h before leaving the factory to stabilize dimensions; 2) Select high molecular weight grades to reduce low-molecular substances; 3) Micro-crosslinking reduces molecular chain mobility and inhibits aging; 4) Control the storage environment temperature at 23±2°C to reduce the influence of temperature change
Key Takeaway
Dimensional change is caused by physical aging; annealing treatment and micro-crosslinking are measures to stabilize dimensions
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