Material Analysis
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DSTDP product dimensional change during long-term storage
Fenómeno do problema
DSTDP product dimensions change ±2-3% after 3 months of storage, exceeding the ±0.5% requirement
Análise das causas
DSTDP physical aging relaxation causes continuous dimensional change; secondary crystallization slowly changes density and dimensions; slow migration of low-molecular substances changes local density
Solução
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) slight crosslinking to reduce molecular chain mobility and inhibit aging; 4) control storage environment temperature at 23±2°C to reduce the influence of temperature change
Conclusão principal
Dimensional change is caused by physical aging; annealing treatment and slight crosslinking are the measures to stabilize dimensions
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