High-temperature-resistant sound-absorbing fiber membrane and preparation method

Abstract

The invention provides a high-temperature resistant sound-absorbing fiber membrane and a preparation method. The fiber membrane is a polyimide piezoelectric composite nanofiber membrane with a hollowstructure; the preparation method particularly comprises the following steps that 1, a polyamide acid (PAA) solution of composite piezoelectric ceramic powder is prepared; 2, the PAA composite solution is a shell spinning solution, a polystyrene (PS) solution is a nuclear layer spinning solution, a coaxial electrospinning technology is adopted, and a PAA / PS nano composite fiber with a nuclear shell structure is obtained; 3, high-temperature imidization treatment is conducted, internal PS is removed through thermal decomposition, and a piezoelectric fiber membrane with a hollow structure is obtained; 4, polarization treatment is conducted, the polyimide nano fiber prepared through the method is uniform in size, the hollow structure is complete, the fiber membrane has the high porosity, thematerial has the light porous hollow structure facilitating sound wave dissipation and the piezoelectric effect generated by piezoelectric particles, the excellent sound absorption property is shown,the good high temperature resistant property and mechanical property are achieved, the sound absorption and noise reduction requirements in the high temperature environment can be met, and the high-temperature resistant sound-absorbing fiber membrane is applicable to the fields of aviation, spaceflight, military equipment and the like.

Description

technical field [0001] The invention relates to a high-temperature-resistant sound-absorbing fiber membrane and a preparation method thereof, belonging to the field of sound-absorbing and noise-reducing materials. Background technique [0002] With the rapid development of modern science and technology, sound absorption and noise reduction has gradually become an important topic related to the coordinated development of high technology, the environment and human beings. In many fields such as construction, transportation, aerospace and military, sound-absorbing and noise-reducing materials have attracted great attention. Fiber-based sound-absorbing materials are the most widely used materials because of their light weight, low cost and excellent sound-absorbing properties, and usually include natural fibers, inorganic fibers, metal fibers, and synthetic polymer fibers. In view of the shortcomings of inorganic fibers such as brittleness, moisture, and dust pollution, and met...

AI Technical Summary

Problems solved by technology

At present, polyimide foam has been studied more, but it occupies a large volume and has poor sound absorption performance at low frequencies. In addition, polyimide fibers are mainly produced by spinning polyamic acid or polyimide solutions. Its spinning process includes wet spinning, dry-wet spinning, melt spinning and electrospinning, etc. The existing polyimide fiber dimensions are mostly in the micron to millimeter level, and its sound absorption effect is poor, especially in The performance of low-frequency sound absorption is more obvious

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