A method for preparing a sound-absorbing composite material

By coating the inner wall of the speaker's rear cavity to form a molecular sieve outer layer that is tightly bonded to the support layer, the problems of fragile sound-absorbing materials and weak connections are solved, thus improving the speaker's acoustic performance and sound quality.

CN116463706BActive Publication Date: 2026-06-09SSI NEW MATERIAL (ZHENJIANG) CO LTD
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Patent Information

Application Number
CN202310481362.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-28
Publication Date
2026-06-09
Estimated Expiration
2043-04-28

AI Technical Summary

Technical Problem

Existing sound-absorbing materials in the rear cavity of loudspeakers, such as zeolite, are prone to crumbling into powder during long-term use and are not firmly connected to the cavity, affecting sound quality. The use of adhesives can also clog the channels and reduce the sound absorption effect.

Method used

An in-situ molding method is used to coat the inner wall of the speaker's rear cavity material, forming a molecular sieve outer layer that is tightly bonded to the support layer. By forming a molecular sieve seed layer and a transition layer on the support layer, the use of adhesives is avoided, thereby enhancing the bonding strength and the performance of the molecular sieve.

Benefits of technology

It improves the acoustic performance of the loudspeaker, lowers the resonant frequency, enhances sound quality, and does not affect the performance of existing sound-absorbing materials.

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Abstract

This invention provides a method for preparing a sound-absorbing composite material, comprising: Step 1: cleaning a support layer to remove surface contaminants; Step 2: forming a molecular sieve seed layer or a molecular sieve transition layer on the surface of the cleaned support layer, or sequentially forming a molecular sieve seed layer and a molecular sieve transition layer; Step 3: placing the product obtained in Step 2 in the growth solution of a third molecular sieve, followed by crystallization, drying, and calcination (with or without calcination) to form a molecular sieve outer layer. Compared with the prior art, the method for preparing the sound-absorbing composite material provided by this invention does not add a binder, but instead directly deposits a film on the inner wall of the rear cavity material of the loudspeaker, i.e., the support layer, through in-situ molding. The bond between the molecular sieve outer layer and the support layer is stronger, and the performance of the molecular sieve can be more fully and effectively utilized.
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