Material Analysis
11 조회수
Dimensional change of EAA products during long-term storage
문제 현상
After 3 months of storage, the dimensions of EAA products change by ±2-3%, exceeding the ±0.5% requirement
원인 분석
EAA physical aging relaxation causes continuous dimensional change; secondary crystallization slowly changes density and dimensions; slow migration of low-molecular substances changes local density
해결 방법
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
핵심 요약
Dimensional change is caused by physical aging; annealing treatment and micro-crosslinking are measures to stabilize dimensions
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