Dropletizer Plate Contact Angle for Polymeric Particle Size Control
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Solution Overview
Problem
The production of water-absorbing polymeric particles often results in a wide particle size distribution, particularly with a high fraction of small particles, which affects their performance characteristics such as Absorbency Under Load and Centrifuge Retention Capacity.
Innovation Solution
A dropletization process using a dropletizer plate with a contact angle of at least 60° to the liquid, generating monodisperse droplets through oscillation, which are then polymerized and dried to produce particles with a narrow particle size distribution, specifically by adjusting the number and diameter of drilled holes and using a carrier plate for efficient droplet formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional dropletization methods are used, then production efficiency is maintained, but particle size distribution becomes wide with high fraction of small particles
Solution Approach 1:
The patent applies parameter changes by modifying the contact angle parameter of the dropletizer plate surface to at least 60 degrees. This parameter change fundamentally alters the droplet formation mechanism, producing monodisperse droplets with narrow size distribution while maintaining high production efficiency. The contact angle modification resolves the contradiction by enabling precise droplet size control without sacrificing productivity.
Solution Approach 2:
The patent employs mechanical vibration of the dropletizer plate to generate monodisperse droplet chains. The vibration frequency and amplitude are controlled to produce uniform droplets with consistent size distribution. This mechanical vibration approach enables precise control over particle size while maintaining continuous production, thus resolving the contradiction between manufacturing precision and productivity.
2Reliability
If postcrosslinking is performed to improve performance characteristics, then Absorbency Under Load and Saline Flow Conductivity increase, but process complexity and production time increase
Solution Approach 1:
The patent applies preliminary action by incorporating crosslinking functionality directly into the polymerization step that forms the particles. The crosslinker is added to the monomer solution before dropletization, so crosslinking occurs simultaneously with particle formation. This preliminary integration of crosslinking eliminates the need for separate postcrosslinking equipment and process steps, reducing complexity while maintaining improved performance characteristics.
Solution Approach 2:
The patent merges the polymerization and crosslinking steps into a single integrated process. By combining these two chemical reactions that previously occurred in separate stages, the patent simplifies the overall process flow, reduces equipment requirements, and eliminates intermediate handling steps. This merging approach maintains the performance benefits of crosslinking while significantly reducing process complexity.
3Productivity
If spray polymerization is used to combine polymerization and drying, then process efficiency improves, but particle size control becomes more difficult
Solution Approach 1:
The patent applies parameter changes by optimizing the contact angle parameter to at least 60 degrees, which fundamentally changes the droplet evaporation behavior during spray polymerization. This parameter modification ensures that droplets maintain their size distribution throughout the polymerization and drying process, preventing coalescence and size variation. The result is narrow particle size distribution achieved through spray polymerization, resolving the contradiction between efficiency and precision.
Solution Approach 2:
The patent uses mechanical vibration during the spray polymerization process to maintain droplet monodispersity. The vibration prevents droplet coalescence during flight and evaporation, ensuring that each droplet polymerizes independently into a particle of consistent size. This mechanical control mechanism enables efficient spray polymerization while maintaining precise particle size control.
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 effectively reduces the fraction of small particles, improving the particle size distribution and enhancing the performance characteristics of water-absorbing polymeric particles, particularly in applications like diapers and market gardening.
Implementation Method 1
at least the underside of the dropletizer plate has at least in part a contact angle of at least 60° with regard to the liquid to be dropletized
Implementation Method 2
generating monodisperse droplets through oscillation
Implementation Method 3
The polymerization of monodisperse droplets leads to polymeric particles of narrow particle size distribution
Implementation Method 4
thermally postcrosslinked and dried
Data Source
AI summary
In a process for dropletizing a liquid by means of a dropletizer plate at least the underside of the dropletizer plate has at least in part a contact angle of at least 60° with regard to the liquid to be dropletized.