Preparation method of macromolecule piezoelectric material

Abstract

The invention discloses a preparation method of a macromolecule piezoelectric material, and belongs to the technical field of an electric material. The preparation method comprises the steps that firstly, biogas and bamboo splits are mixed and fermented, so that fiber is activated; then, steam explosion treatment is performed, so that the bamboo fiber is subjected to fiber separation; primary degradation is performed; after freezing, ice crystals are generated inside the fiber; the ice crystals crack under the grinding pressure, so that the bamboo fiber is refined; then, the fiber and phosphoric acid are subjected to mixed ball milling to prepare cellulose whiskers; the polyhydroxy characteristics of the cellulose whiskers are used for adsorbing precipitates; through calcination, the fiber is carbonized, and magnetic ferroferric oxide is adsorbed; finally, obtained black powder and polyvinylidene fluoride particles are mixed and are subjected to ball milling; after hot pressing sheet forming, polarization treatment is performed to obtain the macromolecule piezoelectric material. The preparation method has the advantages that the strength of a material film is enhanced by the carbonized fiber; the magnetic ferroferric oxide adsorbed by the fiber can be uniformly dispersed in a thin film; the repeatability of the film is improved, so that the structure is controllable; the service life is greatly prolonged; wide market prospects are realized.

Description

technical field [0001] The invention discloses a preparation method of a polymer piezoelectric material, which belongs to the technical field of electric power materials. Background technique [0002] Piezoelectricity refers to the performance of mutual conversion between electrical and mechanical quantities. For example, when the piezoelectric film is deformed by an external force, a potential difference will be generated between the two sides of the film. Conversely, if a voltage is applied between the two sides of the film, the film will also deform. In the past, piezoelectric materials were mainly inorganic piezoelectric materials, such as quartz crystal and lead zirconate titanate. In 1969, Kawai in Japan discovered for the first time that stretched and polarized polyvinylidene fluoride had high piezoelectricity. Since then, the research on polymer piezoelectric materials has developed rapidly. Now polymer piezoelectric materials have been widely used in electroacou...

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention is: aiming at the problem that the membrane structure of the traditional polyvinylidene fluoride-based polymer piezoelectric material is difficult to control, the repeatability is poor, and the membrane strength is low, resulting in a short service life in the process of preparation and use. A preparation method of a piezoelectric polymer material is provided. The invention first uses biogas liquid and bamboo strips for mixed fermentation to activate bamboo fibers, and then uses steam explosion treatment to defibrillate bamboo fibers and degrades them initially, and then uses them after freezing. Ice crystals are generated inside the fibers, and the grinding pressure is used to break the ice crystals, so that the bamboo fibers are refined, and then mixed with phosphoric acid and ball-milled to obtain cellulose whiskers, which are adsorbed and precipitated by the polyhydric properties of the cellulose whiskers, and then calcined to make them The fibers are carbonized and adsorbed with magnetic ferroferric oxide. Finally, the obtained black powder is mixed with polyvinylidene fluoride particles for ball milling, and then hot-pressed into sheets and then polarized to obtain polymer piezoelectric materials.