Wet Mix Elastomer Composite Blends with Carbon Black
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Solution Overview
Problem
Existing methods for producing elastomer composites with blends of elastomers and particulate fillers, such as carbon black, often result in uneven distribution and degradation of polymer properties due to separate processing steps and the use of surfactants, which can lead to early coagulation and reduced mechanical properties.
Innovation Solution
A wet mix method involving the simultaneous coagulation of two elastomer latices with a particulate filler slurry in a coagulum reactor, allowing for the production of elastomer composite blends with improved dispersion and reduced surfactant content, resulting in enhanced mechanical properties and resistivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate processing steps are used for combining filler with elastomer and coagulating latex, then the process is easier to control, but the filler distribution becomes uneven and mechanical properties degrade
Solution Approach 1:
The patent combines the filler incorporation step and the coagulation step into a single simultaneous operation. The filler slurry, first elastomer latex, and second elastomer latex are mixed together and coagulated in one process step, eliminating the separate processing stages that cause filler flocculation and uneven distribution.
Solution Approach 2:
The patent prepares the filler slurry in advance with controlled composition and properties before introducing it to the elastomer latices. This preliminary preparation ensures that the filler is in an optimal state for simultaneous mixing and coagulation, preventing premature flocculation while maintaining ease of process control.
2Adaptability or versatility
If surfactants are added to combine incompatible latices, then the latices can be mixed, but coagulation occurs early and mechanical properties are reduced
Solution Approach 1:
The patent eliminates surfactants from the process entirely by using compatible elastomer latices that can be directly mixed without additional compatibility agents. This removal of harmful substances prevents early coagulation and preserves the mechanical properties of the final composite while still achieving uniform filler distribution.
3Strength
If dry mixing is used to combine elastomers and filler, then polymer molecular weight is preserved, but filler dispersion is reduced and mechanical properties are degraded
Solution Approach 1:
The patent uses a wet mixing process where filler slurry and elastomer latices are combined in a liquid medium, enabling superior filler dispersion through fluid dynamics and shear mixing. This hydraulic approach achieves uniform distribution without the mechanical degradation associated with dry mixing, and the subsequent coagulation preserves polymer molecular weight.
4Manufacturing precision
If wet mixing with separate steps is used, then filler dispersion is improved, but early coagulation occurs and resistivity decreases
Solution Approach 1:
The patent combines filler incorporation and coagulation into a single simultaneous step, preventing the filler from flocculating in the emulsion before coagulation. This merged process maintains uniform filler dispersion while avoiding early coagulation, resulting in vulcanized composites with both improved filler distribution and enhanced electrical resistivity.
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 method produces vulcanized elastomer composites with increased resistivity and improved filler dispersion, achieving a ratio of T300/T100 that is at least 18% greater than dry mix composites, and resistivity that is 2.9 to 5 times higher than comparative dry mix composites, while maintaining low surfactant levels.
Implementation Method 1
allowing the first elastomer latex and the second elastomer latex to coagulate with the particulate filler
Data Source
AI summary
A wet mix elastomer composite comprising carbon black dispersed in an elastomer including a blend of a natural rubber and styrene-butadiene rubber. When the wet mix elastomer composite is processed with CTV Method 1, the vulcanized wet mix elastomer composite exhibits a resistivity that A) has a natural logarithm satisfying the equation ln(resistivity)≥−0.1(loading)+x, where x is 14, or B) is at least 2.9 times greater than the resistivity of a vulcanized dry mix elastomer composite having the same composition and prepared using Comparative CTV Method 1.