Preparation method of porous piezoelectric electret

• Main Authors: YAN YUFU, TAO HUIFANG, ZHU YEHUA, CAO ZUYANG, ZHANG YONGQUAN, CHEN XIAOLI, HUANG CHENGDONG
• Format: Patent
• Language: Chinese; English
• Published: 10.01.2023
• Subjects: DEAF-AID SETS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; PUBLIC ADDRESS SYSTEMS

The invention belongs to the technical field of electrets, and particularly relates to a preparation method of a porous piezoelectric electret, which comprises the following steps: S1, providing electret material dispersion liquid; s2, coating the electret material dispersion liquid on the back plate; s3, keeping the interior of the container of the back plate coated with the electret material dispersion liquid for 16-25 minutes under the condition of controlling specific temperature and pressure; s4, reducing the temperature to be lower than the melting point temperature of the electret material, and keeping the temperature for 10-30 minutes under the pressure P2; s5, enabling the pressure in the container to be quickly released P2 to be equal to P1; s6, the temperature in the container is controlled and maintained for 20 min to 25 min, and micropores in the electret material are shaped; and S7, cooling the product to obtain the porous piezoelectric electret. The film is subjected to micropore forming while