OCA (optically clear adhesive) acoustic film and preparation method thereof

Abstract

The invention provides an OCA (optically clear adhesive) acoustic film which is prepared from the following raw materials: a modified OCA adhesive emulsion, polylactic acid, an antioxidant and a coupling agent A, wherein the modified OCA adhesive emulsion is prepared from the following raw materials: acrylic acid, an acrylate adhesive, polyurethane acrylate oligomer, bisphenol A dimethacrylate, adefoaming agent, a cross-linking curing agent, nano aluminum trioxide, polyformaldehyde and a compound coupling agent B. The acoustic film prepared by a method provided by the invention has a smooth and stable surface, the ratio of of diameters to thicknesses is large, very good acoustic characteristics are achieved very good responsiveness within an acoustic frequency range of 0.025-25000Hz is achieved, the sensitivity is up to 55-110mv / pa, and the static pressure sensitivity is up to 7[mu] m / pa.

Description

technical field [0001] The invention relates to the technical field of acoustic thin films, in particular to an OCA acoustic thin film and a preparation method thereof. Background technique [0002] Sound wave is a kind of mechanical wave generated by the vibration of sound source. The space of sound wave propagation is sound field. When sound propagates in gas and liquid medium, it is a longitudinal wave, but it may be mixed with transverse wave when it propagates in solid medium. The frequency of sound waves that can be heard by the human ear is generally between 20 Hz and 20,000 Hz. Below 20Hz is infrasound, above 20kHz is ultrasound. Sound waves in different frequency bands have different uses in practical applications. Infrasound is used in geoacoustic exploration, and ultrasound is used in nondestructive testing and ultrasonic imaging. When the sound wave propagates in the air, it will cause the density of the air to change, causing the air pressure to change periodi...

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Problems solved by technology

FP microphone film does not require it to be piezoelectric or capacitive, and various materials can be used to prepare acoustic films, such as silver film, silicon film, graphene film, polymer film, sugar-based film, etc.; the sensitivity of the acoustic film and the thickness of the film It is inversely proportional to the cube of the film radius and proportional to the fourth power of the film radius; considering the size of the sensor, the thickness of the acoustic film is often relatively small. At the micron or even nanometer level, it is difficult to increase the radius of the film, and the preparation process of the film is also complicated. High cost, low response to low frequency, the preparation of acoustic film is a difficult point in the development of acoustic sensors

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