Material Analysis
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Large creep deformation of PU
Problem Phenomenon
PU product creep under long-term load >5%, exceeding the 2% requirement
Cause Analysis
PU elastomer inherently has large creep; molecular weight too low, poor creep resistance; not crosslinked, large plastic flow
Solution
1) Select high molecular weight grade; 2) Slight crosslinking with 0.3wt% DCP to reduce plastic flow; 3) Add rigid filler to reduce creep
Key Takeaway
Large creep is caused by elastomer nature; slight crosslinking and rigid filler are key
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