Material Drying
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Performance decline of PET products after damp-heat aging
Problem Phenomenon
The mechanical properties of PET products decline significantly after damp-heat aging testing at 85°C/85%RH.
Cause Analysis
PET degrades (hydrolyzes) under damp-heat conditions; molecular chains break and molecular weight decreases; high-temperature water molecules attack ester bonds, accelerating hydrolysis.
Solution
Add anti-hydrolysis agents (carbodiimide-type hydrolysis stabilizers); fully dry to reduce initial moisture; reduce moisture penetration.
Key Takeaway
PET damp-heat aging is the result of hydrolysis reaction; anti-hydrolysis agents are an effective stabilization means.
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