Heat-Resistant Vibration-Proof Elastomer Composition for Moldability
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Solution Overview
Problem
Elastomer compositions with softeners have insufficient heat resistance due to softener elution and compromised moldability when high-boiling-point softeners are used to improve heat resistance.
Innovation Solution
A composition combining a styrene-based elastomer, paraffin-based process oil, olefin resin, organic peroxide crosslinking agent, crosslinking aid, antioxidant, and surface-treated magnesium hydroxide filler, with specific mass ratios and properties, to create a heat-resistant vibration-proof material with improved heat resistance and moldability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a softener with high boiling point (high viscosity) is used to improve heat resistance, then heat resistance is improved, but moldability worsens
Solution Approach 1:
The patent changes the viscosity parameter of the softener by selecting paraffin-based process oil with specific viscosity range (100-500 mm²/s at 40°C) and controlling the softener content (20-40 parts by mass per 100 parts by mass of elastomer). This parameter optimization resolves the contradiction by finding the optimal balance point where heat resistance is sufficient while moldability is maintained.
Solution Approach 2:
The patent uses a composite softener system combining paraffin-based process oil with specific viscosity characteristics and paraffin wax. This composite approach allows the mixture to exhibit both high-temperature stability (from the viscous paraffin-based process oil) and adequate flow properties (modulated by paraffin wax content and viscosity selection), thereby resolving the contradiction between heat resistance and moldability.
2Ease of operation
If a large amount of softener is added to ensure flexibility, then flexibility is improved, but compression set at high temperature increases
Solution Approach 1:
The patent changes the quality parameter of the softener from merely high viscosity to a specific viscosity range (100-500 mm²/s at 40°C) and controls the softener content within 20-40 parts by mass per 100 parts by mass of elastomer. This parameter control ensures sufficient flexibility while preventing excessive softener elution at high temperatures, thereby maintaining low compression set.
Solution Approach 2:
The patent applies local quality by selecting paraffin-based process oil with specifically controlled viscosity characteristics that provide adequate flexibility at room temperature but exhibit sufficient thermal stability at elevated temperatures. The localized optimization of softener properties differentiates between room-temperature flexibility requirements and high-temperature stability requirements.
3Ease of operation
If conventional softeners are used in elastomer composition, then flexibility and vibration absorption are improved, but heat resistance becomes insufficient due to softener elution
Solution Approach 1:
The patent fundamentally changes the parameter of softener viscosity from conventional low-viscosity softeners to high-viscosity paraffin-based process oil (100-500 mm²/s at 40°C). This parameter change reduces softener elution at high temperatures while maintaining vibration absorption and flexibility, thereby resolving the contradiction between heat resistance and vibration damping performance.
Solution Approach 2:
The patent replaces conventional softeners that are prone to elution and degradation with paraffin-based process oil that exhibits superior thermal stability and resistance to elution. This substitution uses a material (paraffin-based process oil) that maintains its properties under high-temperature conditions, effectively replacing short-lived softeners with long-term stable softeners.
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 resulting heat-resistant vibration-proof material exhibits excellent heat resistance, maintaining a low compression set and resonance frequency stability even at elevated temperatures, while maintaining good moldability and flexibility.
Implementation Method 1
a crosslinking agent including an organic peroxide; a crosslinking aid
Implementation Method 2
a paraffin-based process oil; The paraffin-based process oil has a kinematic viscosity at 40° C. of 300 mm2/s or greater
Implementation Method 3
a surface-treated filler obtained by surface treating particles formed from magnesium hydroxide with a higher fatty acid
Data Source
AI summary
A composition of the present invention includes: a styrene-based elastomer; a paraffin-based process oil; an olefin resin; a crosslinking agent including an organic peroxide; a crosslinking aid; an antioxidant; and a surface-treated filler obtained by surface treating particles formed from magnesium hydroxide with a higher fatty acid. The paraffin-based process oil has a kinematic viscosity at 40° C. of 300 mm2/s or greater. Furthermore, from 405 to 485 parts by mass of the paraffin-based process oil, from 9 to 13 parts by mass of the olefin resin, from 5 to 7 parts by mass of the crosslinking agent, from 13 to 15 parts by mass of the crosslinking aid, from 3 to 4 parts by mass of the antioxidant, and from 15 to 25 parts by mass of the surface-treated filler are respectively blended per 100 parts by mass of the styrene-based elastomer.