Spherical Polymer Particles via Textured Substrate Droplet Curing
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Solution Overview
Problem
There is a lack of methods for preparing spherical polymer particles with uniform particle size distribution, which are advantageous for increasing reaction efficiency due to their wide specific surface area and ease of handling, but existing technologies are limited in producing such shapes.
Innovation Solution
A method involving dropping a curable composition on a substrate with a water contact angle of 150° to 170° and forming semi-spherical engraved patterns to control the shape of droplets, allowing for the formation of almost complete spherical polymer particles by adjusting the ratio of the semi-spherical pattern diameter to the droplet diameter and using a substrate with hydrophobic and oleophobic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a curable composition is coated on a flat substrate and cured, then a sheet-shaped cured product is obtained, but the application range is limited due to the shape and narrow surface area
Solution Approach 1:
The patent divides the continuous sheet-shaped cured product into discrete spherical particles. By controlling droplet formation on a textured substrate, the curable composition is segmented into uniform spherical units that can be independently handled and applied, thereby expanding application versatility while maintaining high surface area to volume ratio.
Solution Approach 2:
The patent employs a substrate with convex patterns that induce spherical droplet formation during curing. The curved surface geometry directly templates the spherical shape of the final particles, transforming the flat sheet morphology into three-dimensional spherical structures that offer superior handling and reactivity.
2Area of stationary object
If spherical particles are formed, then volume is reduced and surface area is increased, but uniform particle size distribution is difficult to achieve
Solution Approach 1:
The substrate is pre-textured with convex patterns before the curable composition is applied. This preliminary structural preparation creates predetermined nucleation sites that control droplet formation and size, ensuring uniform particle dimensions without requiring post-processing sorting or size control mechanisms.
Solution Approach 2:
The patent controls the contact angle of the curable composition on the textured substrate within a specific range (150° to 170°) to achieve optimal droplet sphericality and size uniformity. By precisely controlling this physical parameter, the process achieves narrow particle size distribution while maintaining high surface area characteristics.
3Shape
If the contact angle of the substrate is increased to form droplets, then spherical shape is improved, but the substrate must have very low surface energy
Solution Approach 1:
Instead of relying solely on low surface energy materials, the patent uses a convex textured substrate that physically templates spherical droplet formation. The geometric curvature of the substrate surface provides the primary shaping force, reducing the dependency on extreme surface energy control while achieving high contact angles and spherical morphology.
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 enables the production of polymer particles with a spherical shape, achieving a high degree of sphericity and uniformity, which enhances reaction efficiency and handling characteristics.
Implementation Method 1
a substrate that simultaneously exhibits hydrophobicity and oleophobicity, and has sufficiently low surface energy is used
Implementation Method 2
a substrate that simultaneously exhibits hydrophobicity and oleophobicity
Implementation Method 3
The contact angle is influenced by the surface energy of a substrate and the surface tension of a droplet
Implementation Method 4
curing the droplets
Data Source
AI summary
The present invention relates to a method for preparing spherical cured polymer particles from a curable composition. The method comprises the steps of: dropping a curable composition onto a substrate having a water contact angle of 150° to 170° at 25° C. to form droplets of the curable composition; and curing the droplets to form the polymer particles.