Split-stream Nanocomposite Production via Halogenation Integration
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Solution Overview
Problem
Current methods for producing polymer-clay nanocomposites are costly and inefficient, often requiring separate processing steps and leading to undesirable gel formation, especially when integrating with elastomer halogenation processes.
Innovation Solution
A process that integrates the production of polymer-clay nanocomposites with the elastomer halogenation process by treating a slipstream of polymer solution with a clay dispersion to create a concentrated polymer-clay stream, which is then returned to the halogenation process, allowing for efficient clay incorporation without adverse effects on polymer properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate processing steps are used to produce polymer-clay nanocomposites, then manufacturing precision can be maintained, but productivity decreases and production costs increase
Solution Approach 1:
The patent combines the clay dispersion mixing step with the existing elastomer halogenation process by introducing clay dispersion into the halogenation reactor. This integration allows simultaneous production of halogenated elastomer and nanocomposite in a single continuous process, eliminating separate processing steps and improving productivity while maintaining product quality through controlled addition of clay to the polymer solution during halogenation.
2Productivity
If clay dispersion is added to polymer solution during halogenation, then productivity improves, but gel formation may occur adversely affecting polymer properties
Solution Approach 1:
The patent applies local quality by controlling the concentration and distribution of clay particles within the polymer solution during halogenation. By regulating the amount of clay dispersion added relative to the polymer solution volume and flow rate, the process maintains localized homogeneous distribution of clay particles without creating excessive concentrations that would lead to gel formation. The continuous addition method ensures uniform dispersion throughout the reaction zone.
Solution Approach 2:
The patent uses partial action by adding clay dispersion in controlled, limited amounts to the polymer solution during halogenation, rather than using excessive quantities that would cause gel formation. The process optimizes the ratio of clay to polymer and controls the rate of addition to achieve sufficient nanocomposite formation without adverse gelation effects, using just the right amount of clay dispersion.
3Reliability
If organically modified clays are used, then interaction with polymer improves, but production cost increases
Solution Approach 1:
The patent employs inexpensive inorganic clays such as montmorillonite, bentonite, or vermiculite as alternatives to expensive organically modified clays. These natural clays are cost-effective and can be directly incorporated into the polymer solution during halogenation without requiring costly organic modification steps. The process achieves satisfactory polymer-clay interaction using these affordable materials, significantly reducing production costs while maintaining nanocomposite quality.
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
This method reduces production costs and improves efficiency by minimizing separate processing steps, while maintaining the desired air barrier properties and preventing gel formation, resulting in a nanocomposite suitable for use in applications like innerliners and innertubes.
Implementation Method 1
treating a slipstream of polymer solution from the halogenation process with a clay dispersion to form a concentrated polymer-clay stream
Data Source
AI summary
The present invention is a process to produce a nanocomposite of a elastomer and organic clay, e.g. an exfoliated clay, suitable for use as an air barrier. The process can include the steps of: (a) contacting a solution (10) of butyl rubber in an organic solvent with a halogen (12) to form a halogenated butyl rubber solution (16); (b) neutralizing the halogenated butyl rubber solution; (c) functionalizing at least a portion (18) of the halogenated butyl rubber; (d) mixing a dispersion (22) of clay with the functionalized butyl rubber (18) to form a masterbatch (26) comprising a polymer-clay nanocomposite; (e) combining the masterbatch (26) with the rest of the halogenated butyl rubber solution (20) to form a second mixture (28); (e) recovering the nanocomposite from the second mixture (28). The nanocomposite so formed has improved air barrier properties and is suitable for use as a tire innerliner or innertube.