Polyester Resin Damping Composition
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Solution Overview
Problem
Conventional vibration-damping materials face limitations in mold processability and weight due to the use of metal components, and they often have insufficient vibration-damping properties, especially when using composite materials or alloy materials.
Innovation Solution
A polyester resin composition is developed that includes a thermoplastic polyester resin with a dicarboxylic acid and diol component, combined with a plasticizer and/or styrene-isoprene block copolymer, which enhances vibration-damping properties while maintaining a high flexural modulus, by incorporating an inorganic filler and optimizing the glass transition temperature and crystallinity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If composite materials or alloy materials are used for vibration damping, then vibration-damping properties are improved, but weight increases and mold processability is limited
Solution Approach 1:
The patent changes the chemical composition parameters of the polyester resin by controlling the ratio of dicarboxylic acid components (adipic acid 10-50 mol%, suberic acid 10-50 mol%, sebacic acid 10-50 mol%) and diol components (ethylene glycol 30-70 mol%, 1,3-propanediol 10-40 mol%, 1,4-butanediol 10-40 mol%). This parameter optimization achieves high vibration-damping properties (loss tangent ≥0.05) while maintaining light weight and good mold processability, resolving the contradiction between vibration damping performance and weight.
Solution Approach 2:
The patent creates a composite resin system by combining multiple dicarboxylic acid components (adipic acid, suberic acid, sebacic acid) with multiple diol components (ethylene glycol, 1,3-propanediol, 1,4-butanediol) in specific ratios. This composite approach achieves synergistic effects that improve vibration-damping properties beyond what single-component resins can provide, while maintaining the advantages of polyester resins including light weight and mold processability.
2Reliability
If metal plates are used for vibration damping, then vibration-damping properties are improved, but weight increases
Solution Approach 1:
The patent replaces expensive, heavy metal damping materials with a cost-effective polyester resin composition that can be easily molded and applied. The resin provides sufficient vibration-damping properties (loss tangent ≥0.05) without the weight penalty of metal plates, making it an economical and practical alternative for various applications including audio equipment and construction.
Solution Approach 2:
The patent substitutes metal-based mechanical vibration damping systems with a polymer resin system that achieves damping through molecular chain relaxation and glass transition mechanisms. This substitution eliminates the need for heavy metal plates while maintaining vibration-damping functionality through the optimized polyester resin composition containing specific dicarboxylic and diol components.
3Reliability
If alloy materials are used for vibration damping, then vibration-damping properties are improved, but weight increases and mold processability deteriorates
Solution Approach 1:
The patent optimizes the chemical composition parameters of the polyester resin to achieve a balance between vibration-damping properties and mold processability. By controlling the ratios of dicarboxylic acid components (adipic acid 10-50 mol%, suberic acid 10-50 mol%, sebacic acid 10-50 mol%) and diol components, the resin achieves loss tangent ≥0.05 while maintaining good flow and molding characteristics, eliminating the processability issues associated with alloy materials.
4Stability of the object's composition
If high-rigidity metal plates are used to retain shape, then shape stability is improved, but weight increases
Solution Approach 1:
The patent optimizes the glass transition temperature (Tg) and crystallinity parameters of the polyester resin to achieve shape stability without requiring heavy metal support structures. By controlling the composition ratios and processing conditions, the resin achieves appropriate rigidity and dimensional stability while maintaining the light weight advantage, eliminating the need for high-rigidity metal plates.
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 solution achieves faster vibration damping with a smaller initial vibrating width, reducing extraneous vibrations and noise in equipment and buildings, while maintaining high rigidity and light weight, thus improving the overall vibration-damping performance.
Implementation Method 1
a glass transition temperature (Tg) of 20°C or higher and 160°C or lower
Implementation Method 2
a material having excellent vibration damping property even while a flexural modulus is high
Implementation Method 3
containing a thermoplastic polyester resin, a plasticizer and/or a styrene-isoprene block copolymer, and an inorganic filler
Data Source
Figure 1
AI summary
A polyester resin composition for a vibration-damping material, containing a thermoplastic polyester resin constituted of a dicarboxylic acid component and a diol component (A), one or more members selected from the group consisting of plasticizers and styrene-isoprene block copolymers (B), and an inorganic filler (C). The polyester resin composition of the present invention can be suitably used as a vibration-damping material for a material for audio equipment such as, for example, speakers, television, radio cassette players, headphones, audio components, or microphones, and manufactured articles such as electric appliances, transportation vehicles, construction buildings, and industrial equipment, or parts or housing thereof.