Amine-Crosslinked Acrylate Diaphragm for Miniature Sound Devices
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Solution Overview
Problem
Existing miniature sound generation devices face challenges with high preparation costs and limited temperature resistance due to the use of acrylic rubber diaphragms, which are typically cross-linked with sulfur or peroxide and restricted to compression molding.
Innovation Solution
A diaphragm for miniature sound generation devices is developed using a rubber film layer formed by cross-linking an acrylate polymer containing carboxylic acid groups with an amine cross-linking agent, allowing for unrestricted molding methods and reducing preparation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If acrylic rubber diaphragm is cross-linked with sulfur or peroxide using compression molding, then the diaphragm can be manufactured, but the preparation cost is high due to expensive molds
Solution Approach 1:
The patent changes the cross-linking chemistry from sulfur/peroxide systems to amine-based cross-linking, which fundamentally alters the manufacturing parameters and enables new molding methods. This chemical parameter change allows the diaphragm to be manufactured using cost-effective air pressure molding instead of expensive compression molding, directly resolving the cost issue while expanding manufacturing flexibility
Solution Approach 2:
The patent replaces the mechanical compression molding process with a chemical cross-linking process that enables air pressure molding. By substituting the mechanical system with a chemical system, the invention eliminates the need for expensive compression molds while achieving the same diaphragm formation, thereby reducing preparation cost and increasing ease of manufacture
2Temperature
If acrylic rubber diaphragm is cross-linked with sulfur or peroxide, then the diaphragm can be formed, but the temperature resistance is insufficient
Solution Approach 1:
The patent changes the cross-linking agent from sulfur or peroxide to amine-based compounds, which fundamentally alters the thermal stability parameters of the rubber diaphragm. This chemical parameter change results in significantly improved temperature resistance and long-term reliability in harsh environments, as the amine cross-linked structure maintains its properties at higher temperatures compared to traditional sulfur/peroxide cross-linked structures
3Ease of manufacture
If amine cross-linking agent is used with acrylate polymer containing carboxylic acid groups, then the molding method becomes unrestricted and cost is reduced, but the cross-linking reaction requires specific conditions
Solution Approach 1:
The patent uses the carboxylic acid groups in the acrylate polymer as an intermediary that facilitates the amine cross-linking reaction. The carboxylic acid groups act as a mediator between the amine cross-linking agent and the polymer chains, enabling efficient cross-linking under mild conditions. This intermediary mechanism allows the system to achieve effective cross-linking without requiring harsh conditions, thus maintaining ease of manufacture while achieving unrestricted molding methods
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 new diaphragm achieves excellent temperature resistance and resilience, enabling reliable long-term performance in harsh environments while reducing production costs and expanding molding options.
Implementation Method 1
a rubber film layer formed by cross-linking reaction of an acrylate polymer, wherein the acrylate polymer contains carboxylic acid group, and the cross-linking agent is an amine cross-linking agent
Data Source
AI summary
The present disclosure relates to the technology field of acoustic product. Disclosed are a diaphragm for miniature sound generation device and a miniature sound generation device. The diaphragm includes a rubber film layer formed by cross-linking reaction of an acrylate polymer, wherein the acrylate polymer contains carboxylic acid group, the cross-linking agent is an amine cross-linking agent. The present disclosure effectively improves the degree of cross-linking by using the acrylate polymer containing carboxylic acid group and the amine cross-linking agent, resulting in excellent resilience and temperature resistance of the diaphragm; At the same time, it allows the diaphragm forming method to be unrestricted and reduces preparation cost; It also improves the low-frequency performance of the miniature sound generation device, such that it has a full bass and a comfortable listening experience.