Spray Polymerization for Smooth Polymer Spheres
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Solution Overview
Problem
Current polymer production methods by spray polymerization face challenges in achieving consistent particle size and surface smoothness, and the polymers produced often require additional processing steps for thickening applications.
Innovation Solution
A process involving spray polymerization of a monomer dispersion with a hydrophobic, inert liquid, where the aqueous phase is dispersed in the inert liquid, using specific ethylenically unsaturated monomers, initiators, and controlled reaction conditions to produce polymers with desired properties for thickening liquids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spray polymerization is carried out by spraying monomer solutions into a heated atmosphere, then polymerization occurs and droplets are concurrently dried, but the polymeric particles have a rough surface at reduced pressure
Solution Approach 1:
The patent changes the pressure parameter from reduced pressure to elevated pressure (1-20 bar) during spray polymerization. This parameter change resolves the contradiction by producing smooth polymeric spheres while maintaining efficient polymerization, eliminating the rough surface defect that occurs at reduced pressure.
2Manufacturing precision
If spray polymerization is carried out at elevated pressure, then smooth polymeric spheres are obtained, but the process requires more complex pressure control
Solution Approach 1:
The patent introduces an inert atmosphere (nitrogen or carbon dioxide) at elevated pressure as the heating medium. This approach simplifies the overall system by using a chemically inert environment that prevents unwanted reactions while providing the necessary heat transfer, making the elevated pressure process more manageable and safer.
3Productivity
If conventional spray polymerization is used, then polymer production is achieved, but additional processing steps are required for thickening applications
Solution Approach 1:
The patent combines polymerization and drying operations into a single integrated spray polymerization process. The polymer particles are formed and dried simultaneously in the elevated pressure inert atmosphere, eliminating the need for separate drying and processing steps, thereby simplifying the manufacturing process for thickening applications.
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 process results in polymers with controlled particle size and surface smoothness, suitable for thickening liquids and cosmetic applications, offering improved viscosity and redispersibility.
Implementation Method 1
The monomers in the sprayed droplets are polymerized
Implementation Method 2
the droplets are concurrently dried
Data Source
AI summary
Process for producing polymers by spray polymerization wherein the monomer solution is dispersed in a hydrophobic liquid, the use of the polymers for thickening liquids and also an apparatus for producing polymers by spray polymerization.