Sound-insulation PVB photographic film and preparation method thereof

Abstract

The invention relates to a sound-insulation PVB photographic film and a preparation method thereof. The sound-insulation PVB photographic film is formed by compounding three layers of films A, B and C, wherein the thickness of the middle-layer film B is 100-200 microns, the thickness of the film A outside the film B is 300-500 microns, and the thickness of the film C outside the film B is 300-500 microns; and the middle-layer film B is prepared from modified PVB resin powder with a fusion index of 6g / 10min-10g / 10min, and the film A and the film C are prepared from modified PVB resin powder with a fusion index of 4g / min-5g / 10min. The prepared three-layer sound-insulation PVB photographic film is capable of effectively blocking noise within in a human ear-sensitive range of 1000Hz-4000Hz, and compared with PVB with a conventional thickness, the sound-insulation effect can be increased by 3dB-5dB.

Description

technical field [0001] The invention relates to a sound-insulating PVB film, which belongs to the application field of sound-insulating adhesive glass. Background technique [0002] Sound is a vibration wave, and the frequency to which the human ear is particularly sensitive is 1000-4000 Hz. End customers in the field of glass applications are paying more and more attention to noise reduction in automobiles and architectural glass, and they are also focusing on safety factors, because noise pollution affects people's working environment and comfort. [0003] In the past, people usually used solid or a large number of product design elements to increase the thickness of the glass to improve the sound insulation performance of the glass. However, as people pay more and more attention to environmental issues, the limitations of glass design, there are certain restrictions on increasing the thickness and hardness, " "Green and environmental protection" has also become the prima...

AI Technical Summary

Problems solved by technology

However, improving the PVB resin structure, increasing the content of butyraldehyde groups, reducing the content of hydroxyl groups, or increasing the proportion of plasticizers to adjust the mechanical loss factor of different PVB layers will have the following risks: the mechanical properties of the film will decrease, the aging performance will decrease, and the plasticizer will precipitate. and many more

At the same time, due to the large difference in physical properties of materials in the preparation of multilayer films, it is difficult to form films with uniform thickness and difficult processing, resulting in poor practicability and no marketization.

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