Method for reducing PFAS in low-molecular-weight fluorine polymer

• Main Authors: ZHANG MEI, ZHANG CHAOGUANG, LI MENG, LONG CHANGMING, WANG YUN
• Format: Patent
• Language: Chinese; English
• Published: 12.07.2024
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

The invention relates to the technical field of fluoropolymers, and particularly discloses a method for reducing PFAS in a low-molecular-weight fluoropolymer. The method for reducing the PFAS in the low-molecular-weight fluoropolymer comprises the following steps: S1, mixing: uniformly mixing the high-molecular-weight fluoropolymer with a free radical quenching agent to obtain a premix; s2, cracking: putting the premix into irradiation treatment equipment, and carrying out irradiation treatment to obtain a cracking product containing the free radical quenching agent; s3, quenching agent treatment: performing extraction, solid-liquid separation, washing, filtering, drying and the like on the cracking product containing the free radical quenching agent to obtain a quenching agent reclaimed material and an intermediate product; and S4, crushing: carrying out micronization treatment on the intermediate product to obtain the low-molecular-weight fluoropolymer. According to the post-treatment process of the free ra