Modified Nanoclay Elastomeric Composites
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Solution Overview
Problem
Elastomeric composites reinforced with carbon black or silica exhibit reduced springiness and stiffness after flexing, becoming relatively brittle at low temperatures, and their preparation is challenging, while existing nanofillers like nanoclays have limitations in improving mechanical and thermal properties.
Innovation Solution
Development of modified nanoclays treated with amine-containing antioxidants and silyl-containing compounds, such as mercaptosilanes, to enhance mechanical and rheological properties, and reduce oxidative damage, allowing for the creation of elastomeric composites with improved tear resistance and aging properties without the need for high carbon black content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon black or silica is added to elastomeric composites to improve strength and toughness, then abrasion resistance and tensile strength are enhanced, but springiness and stiffness are reduced, and the material becomes brittle at low temperatures
Solution Approach 1:
The patent changes the physical and chemical parameters of the filler by using nanoscale clay particles (1-100 nm) instead of conventional micron-scale carbon black or silica. This size parameter change allows achieving reinforcement at much lower concentrations (1-20 phr vs. 30-50 phr), thereby maintaining the elastomer's springiness and stiffness while still improving strength and abrasion resistance
Solution Approach 2:
The patent creates a composite material system by combining nanoclays with elastomers to form nanocomposites. This composite approach allows the nanoclay particles to reinforce the elastomer matrix through their high surface area and aspect ratio, improving mechanical properties without the brittleness issues associated with conventional high-loading fillers
2Stress or pressure
If high amounts of carbon black or silica are added to increase elastic modulus, then the modulus is further increased, but the strength may be lowered and the material becomes more brittle
Solution Approach 1:
The patent changes the concentration parameter by achieving effective reinforcement at 1-20 parts per hundred rubber (phr) of nanoclay, compared to 30-50 phr of conventional fillers. This parameter change allows reaching the desired elastic modulus without over-filling, thereby preserving tensile strength and avoiding brittleness
Solution Approach 2:
The patent applies local quality enhancement by using nanoscale particles with high aspect ratios that can locally reinforce the elastomer matrix at critical stress points. The nanoclay particles distribute stress more effectively at the molecular level, providing local strengthening without requiring high overall filler concentrations that would compromise bulk strength
3Strength
If conventional fillers like carbon black are used to reinforce elastomers, then mechanical properties are improved, but the preparation process becomes difficult and the material exhibits reduced resilience
Solution Approach 1:
The patent changes the particle size parameter to the nanoscale range (1-100 nm), which fundamentally alters the interaction between filler and elastomer. This parameter change improves compatibility and dispersion characteristics, making the compounding process easier and reducing the need for intensive mixing while maintaining excellent mechanical properties and resilience
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 modified nanoclays result in elastomeric composites with enhanced tear resistance, modulus, and reduced aging, achieving similar performance to composites with higher carbon black content while using lower amounts of filler, leading to lighter and more durable products.
Implementation Method 1
a modified nanoclay, the modified nanoclay comprising a nanoclay being in association with an amine-containing compound featuring antioxidation activity
Implementation Method 2
Elastomeric composites containing modified nanoclays exhibit improved mechanical and rheological properties, as compared to composites containing prior art modified nanoclays
Implementation Method 3
Studies have shown that for a filler to be reinforcing, the filler particles must have small diameter, at the nanometer range, for instance 10-50 nm, and must be well-adhered by the elastomer
Data Source
AI summary
A methodology for producing modified nanoclays which, when added to an elastomer, provide elastomeric nanocomposites with improved ageing, rheological and mechanical properties, and which can be devoid of, or containing low amount of, a filler such as carbon black, is provided. The modified nanoclays are made of a nanoclay, such as an organomodified nanoclay, modified so as to be in association with an amine-containing antioxidant and optionally also with a silyl-containing compound, such as mercaptosiloxane. Also provided are processes of preparing the modified nanoclays, elastomeric composites containing same and articles containing the elastomeric composites.