Polytetrafluoroethylene and preparation method thereof, expanded polytetrafluoroethylene and application thereof

By dividing the exothermic stages and adjusting the temperature in real time during the preparation of polytetrafluoroethylene, the problems of wide molecular weight distribution and insufficient creep resistance are solved, and narrower molecular weight distribution and better creep resistance are achieved, which is suitable for sealing materials applications in aerospace equipment.

CN119306864BActive Publication Date: 2025-03-28ANHUI ZHONGWANG KEXIMENG TECH CO LTD
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Patent Information

Application Number
CN202411876385.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2025-03-28
Estimated Expiration
2044-12-19

AI Technical Summary

Technical Problem

The wide molecular weight distribution during tetrafluoroethylene polymerization leads to insufficient stretching of macromolecular resins during bidirectional stretching, and a large number of nodes are present, which affects the creep resistance of expanded polytetrafluoroethylene. Especially during the operation of aviation aircraft, it is easy to cause material creep and vacuum state, which leads to disassembly difficulties.

Method used

By studying the relationship between exothermic changes and temperature during the preparation of polytetrafluoroethylene, the exothermic increase and decrease stages are divided, the corresponding temperature control schedule is formulated, the temperature in the reactor is regulated in real time, and the temperature in the reaction point is consistent, so that the molecular weight distribution of polytetrafluoroethylene is more concentrated.

Benefits of technology

The molecular weight distribution of PTFE has been achieved, which reduces the existence of junctions, improves the creep resistance of expanded PTFE, and avoids the vacuum state and disassembly difficulties caused by creep in aviation applications.

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Abstract

The invention relates to the technical field of polytetrafluoroethylene preparation, and discloses polytetrafluoroethylene and its preparation method, expanded polytetrafluoroethylene and its application. The preparation method of polytetrafluoroethylene comprises: according to different instantaneous heat release at different times, obtaining in advance the instantaneous heat release Q in the conventional polytetrafluoroethylene preparation process; 瞬时 The relationship curve between Q0 and time is used to calculate the average heat release per unit time Q0 of the entire reaction process. The entire reaction is divided into different stages, including Q 瞬时 ≤Q0 at least one stage, and Q 瞬时 > at least one stage of Q0; adding the same reaction raw materials as in the conventional preparation method of polytetrafluoroethylene into the reactor for polymerization reaction; Q 瞬时 ≤Q0 stage, the temperature of the reaction liquid in the reactor is controlled to be T1, Q 瞬时 >Q0 stage, the temperature of the reaction liquid in the reactor is controlled to be T2, T2=T1-(1℃~3℃). This method can produce polytetrafluoroethylene with a narrow molecular weight distribution.
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