Vibration-Damping Resin Composition via Elastomeric Block Polymer Blending
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Solution Overview
Problem
Existing thermoplastic resin compositions struggle to achieve a balance between high vibration-damping properties and mechanical rigidity, while also maintaining excellent molding processability and surface appearance, and fail to effectively suppress resonance-induced noises.
Innovation Solution
A vibration-damping material composed of a specific polymer blend (B) containing polymer (b1) with a glass transition temperature of -10°C to 30°C and polymer (b2) with a swelling degree of 900% or more, and a Tan δ peak intensity of 1.900 or more, is blended with a thermoplastic resin to form a composition that enhances vibration attenuation and resonance suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If materials with high rigidity are used for structures, then mechanical strength is improved, but vibration-damping properties deteriorate
Solution Approach 1:
The patent uses a composite material system consisting of a thermoplastic resin matrix combined with a specific elastomeric block polymer (polymer B) containing polymer (b1) and polymer (b2). This composite structure allows the rigid thermoplastic resin to provide mechanical strength while the elastomeric block polymer with specific Tan δ characteristics provides vibration-damping properties, resolving the trade-off between rigidity and vibration damping.
Solution Approach 2:
The patent specifies precise parameter ranges for the elastomeric block polymer, including Tan δ peak intensity of 1.85 or more, glass transition temperature of -50°C or lower for polymer (b1), and specific molecular weight ranges. By controlling these parameters, the material achieves optimal balance between rigidity and vibration-damping performance.
2Reliability
If rubber-like polymers are blended to improve vibration-damping, then vibration attenuation is improved, but molded appearance and surface quality deteriorate
Solution Approach 1:
The patent specifies that the elastomeric block polymer (polymer B) should have a Tan δ peak intensity of 1.85 or more and glass transition temperature of -50°C or lower for polymer (b1). These parameter specifications ensure the rubber particles remain sufficiently soft and flexible to provide vibration damping while maintaining good adhesion to the thermoplastic resin matrix, preventing surface peeling and ensuring good molded appearance.
Solution Approach 2:
The patent creates a composite system where the elastomeric block polymer is specifically designed with core-shell structure or graft copolymer architecture. This composite structure allows the rubber phase to provide vibration damping while the shell or graft portions ensure good interfacial adhesion with the thermoplastic matrix, preventing surface defects.
3Productivity
If molding temperature and injection speed are increased to improve flowability, then manufacturing efficiency is improved, but resin retention and thermal decomposition occur
Solution Approach 1:
The patent specifies that the elastomeric block polymer should have specific molecular weight ranges (polymer (b1): 5,000-500,000, polymer (b2): 50,000-1,000,000) and Tan δ peak intensity of 1.85 or more. These parameter specifications optimize the viscosity and flow characteristics of the resin composition, enabling good mold filling at moderate processing conditions while preventing resin retention and thermal decomposition.
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 composition results in molded articles with improved flowability, impact resistance, heat resistance, mechanical properties, and excellent vibration-damping properties, including high vibration attenuation and resonance suppression, while maintaining good surface appearance.
Implementation Method 1
a polymer (b1) having a glass transition temperature of -10°C to 30°C... a temperature (peak temperature) showing a peak value of a main dispersion of Tan δ... a peak intensity, which is the peak value, of 1.900 or more
Implementation Method 2
a swelling degree of a THF-insoluble matter of a polymer (B) measured by the following method is 900% or more... After immersing the polymer (B) in tetrahydrofuran (THF) for 24 hours
Data Source
AI summary
A vibration-damping material comprising a polymer (B), wherein the polymer (B) comprises a polymer (b1) having a glass transition temperature of -10°C to 30°C and a polymer (b2) different from the polymer (b1), and wherein a swelling degree of a THF-insoluble matter of the polymer (B) measured by the following method is 900% or more. <Method of measuring swelling degree> After immersing the polymer (B) in tetrahydrofuran (THF) for 24 hours, an insoluble matter separated by centrifugation is vacuum-dried and its weight (weight b) is measured. The obtained THF-insoluble matter is again immersed in THF for 24 hours, after which the weight (weight c) of the sample swollen with THF is measured, and the swelling degree of the THF-insoluble matter is calculated by the following formula. Swellingdegree%=c/bx100