Polymer Particle Production via Solid Coating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing processes for producing polymer particles by polymerizing liquid droplets in a gas phase are susceptible to faults, leading to low yield and increased formation of agglomerates and wall deposits due to rapid drying and high solvent content, which affects monomer conversion and particle quality.
Innovation Solution
A process where liquid droplets are coated with particulate solids during polymerization, allowing for the suppression of agglomerate and wall deposit formation, with controlled droplet and solid diameters, and recycling of polymer particles, to enhance monomer conversion and coating yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid droplets are polymerized in a gas phase with rapid drying, then polymer particles are produced, but monomer conversion decreases and particle quality deteriorates
Solution Approach 1:
The patent introduces an intermediary substance (particulate solid or gas phase medium) that mediates between the liquid droplets and the drying process, allowing polymerization to proceed without excessive solvent removal. This intermediary enables controlled mass and heat transfer, maintaining monomer conversion while producing polymer particles.
2Productivity
If polymer particles have high solvent content, then polymerization proceeds, but particles become tackier and form agglomerates and wall deposits
Solution Approach 1:
The particulate solid acts as an intermediary that absorbs excess solvent and prevents direct contact between tacky polymer particles. This mediator reduces interparticle adhesion and wall deposits while maintaining polymerization efficiency.
Solution Approach 2:
The process allows for the removal and recycling of formed agglomerates and wall deposits. By discarding these harmful byproducts and recovering valuable monomer and polymer materials, the process maintains high productivity while minimizing quality defects.
3Object-generated harmful factors
If droplet diameter is increased to reduce agglomeration, then particle size increases, but process control becomes more difficult
Solution Approach 1:
The patent systematically varies key parameters including droplet diameter (200-500 μm), gas phase temperature, and particulate solid characteristics to optimize the balance between reducing agglomeration and maintaining process control. These parameter changes enable predictable particle formation without excessive complexity.
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 achieves a higher yield and prevents agglomerate and wall deposit formation, resulting in polymer particles with improved quality and consistency, particularly suitable for producing water-absorbing polymer particles with enhanced properties.
Implementation Method 1
the droplets are coated with particulate solids during the polymerization
Implementation Method 2
polymerizing liquid droplets in a gas phase surrounding the droplets
Data Source
AI summary
A process for producing polymer particles by polymerizing liquid droplets in a gas phase surrounding the droplets, said droplets comprising at least one monomer and being coated with particulate solids during the polymerization.