Material Drying
4 조회수
PBT Hydrolysis Resistance Shortcoming
문제 현상
After being used in a hot and humid environment for a period of time, PBT products' performance drops sharply and they become brittle
원인 분석
PBT contains ester bonds; when placed in water above the glass transition temperature, ester bond breakage occurs; the acidic environment formed by hydrolysis self-catalyzes and accelerates the reaction; the terminal carboxyl concentration is the decisive factor of hydrolysis sensitivity
해결 방법
①For hot and humid environments select hydrolysis-resistant modified grades; ②Add hydrolysis stabilizer carbodiimide; ③Use epoxy functional group additives to block terminal carboxyl groups; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
핵심 요약
PBT's poor hydrolysis resistance stems from ester bonds and terminal carboxyl groups; carbodiimide and end-capping technology are the two major modification routes; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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