Mesoporous Sound-Absorbing Particles for Speaker Acoustic Performance
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Solution Overview
Problem
Traditional sound-absorbing material particles used in speaker devices have poor strength, uneven particle size, and limited sound-absorbing effects, which hinder air flow and reduce speaker sensitivity due to their restricted physical structure and performance.
Innovation Solution
A method involving the preparation of mesoporous sound-absorbing material particles through mixing sound-absorbing material powder with a templating agent and binding agent to form sol slurry, followed by aging in forming oil to create gel particles, drying, and roasting, which enhances the structural framework and sound absorption capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional granulation methods (extrusion, boiling granulation, rolling into balls) are used to prepare sound-absorbing material particles, then the particles can be formed for filling into speaker rear chambers, but the particles have poor strength, uneven particle size, and limited sound-absorbing effects
Solution Approach 1:
The patent employs a porous polymeric bead structure as the core material for sound-absorbing particles. These beads inherently possess a porous internal structure that provides both mechanical strength and acoustic absorption capabilities. The porous structure allows sound waves to penetrate and dissipate energy while maintaining particle integrity and uniform size distribution during handling and filling operations.
Solution Approach 2:
The patent creates composite particles by combining porous polymeric beads with sound-absorbing materials such as metal powders, ceramic powders, or carbon black. This composite structure leverages the mechanical strength and size uniformity of the polymeric bead framework while incorporating materials with superior acoustic absorption properties, thereby resolving both strength and sound-absorbing effectiveness requirements.
2Reliability
If traditional granulation methods are used, then particles can be produced, but the physical structure is restricted and sound-absorbing effects are limited
Solution Approach 1:
The porous polymeric bead structure provides a three-dimensional network of interconnected voids that effectively absorb sound waves across multiple frequencies. This porous architecture enhances sound-absorbing reliability without requiring complex external structures, as the absorption capability is inherent to the particle morphology itself.
Solution Approach 2:
The patent embeds sound-absorbing material particles within or around the porous polymeric bead structure, creating a nested configuration where the polymeric framework provides structural support and the embedded materials provide enhanced acoustic absorption. This nested arrangement maximizes sound-absorbing effectiveness within a simple overall particle geometry.
3Reliability
If sound-absorbing material particles are filled into the rear chamber, then acoustic performance can be improved, but air flow is hindered and speaker sensitivity is reduced
Solution Approach 1:
The porous structure of the polymeric beads allows air to pass through the particles while sound waves are absorbed by the porous network. This dual functionality maintains smooth air flow for speaker operation while simultaneously providing effective sound absorption, resolving the contradiction between acoustic performance and air flow requirements.
Solution Approach 2:
The patent optimizes the local porous structure of the particles to differentially interact with sound waves and air flow. The porous configuration is designed to absorb acoustic energy while maintaining permeability to air, creating localized properties that satisfy both acoustic performance and air flow smoothness requirements within the same particle structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method produces particles with improved strength, uniform size distribution, and increased sound absorption, ensuring smooth air flow and enhanced acoustic performance by creating a mesoporous structure that matches the speaker's requirements.
Implementation Method 1
the sol slurry is dropped into forming oil, and droplets of the sol slurry are aged in the forming oil to form gel particles
Implementation Method 2
the gel particles are taken out from the forming oil, and the gel particles are dried to form mesoporous sound-absorbing material particles
Implementation Method 3
In step 4, the mesoporous sound-absorbing material particles are roasted
Implementation Method 4
increased sound absorption, ensuring smooth air flow and enhanced acoustic performance by creating a mesoporous structure
Data Source
AI summary
The invention discloses a method for preparing mesoporous sound-absorbing material particles and mesoporous sound-absorbing material particles. The preparation method comprises the following steps. In step 1, sound-absorbing material powder and a templating agent are mixed with a binding agent and water to form sol slurry, the templating agent is an organic monomer or a linear polymer, and the templating agent has a purity greater than 95%. In step 2, the sol slurry is dropped into forming oil, and the droplets of the sol slurry are aged in the forming oil to form gel particles. In step 3, the gel particles are taken out from the forming oil and the gel particles are dried to form mesoporous sound-absorbing material particles. In step 4, the mesoporous sound-absorbing material particles are roasted.