Material Analysis
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PU hydrolytic aging
Problem Phenomenon
In hot and humid environment, PU product mechanical properties decrease >25%
Cause Analysis
PU contains polar groups that hydrolyze and break chains under hot and humid conditions; ester bonds/amide bonds etc. are sensitive to water
Solution
1) Select low polarity content grade to reduce hydrolysis tendency; 2) Add anti-hydrolysis stabilizer; 3) Coat product surface with waterproof layer
Key Takeaway
Hydrolytic aging is caused by polar groups being sensitive to water; selecting low polarity grade is key
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