Material Analysis
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Large PVA creep deformation
Problem Phenomenon
PVA product creep under long-term load >5%, exceeding the 2% requirement
Cause Analysis
PVA elastomer nature has large creep; molecular weight on the low side, poor creep resistance; no crosslinking, large plastic flow
Solution
1) Select high molecular weight grade; 2) Slight crosslinking 0.3wt% DCP to reduce plastic flow; 3) Add rigid filler to reduce creep
Key Takeaway
Large creep is caused by the elastomer nature; slight crosslinking and rigid filler are the key
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