Superabsorbent Polymer Monomer Composition for Bubble-Stable Porosity
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Solution Overview
Problem
Existing methods for preparing superabsorbent polymers using blowing agents result in bubble loss before polymerization, leading to insufficient pore formation and deterioration of surface tension, which affects absorption speed and gel strength.
Innovation Solution
A monomer composition comprising acrylic acid-based monomers, a crosslinking agent, clay, a carbonate-based blowing agent, and a polymerization initiator, with specific amounts and mixing conditions, to achieve rapid polymerization and high gel strength, minimizing bubble loss and enhancing absorption speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a blowing agent is added to conduct polymerization while bubbles are formed in the monomer composition, then the surface area of superabsorbent polymer is increased through porous structure formation, but bubbles are lost before polymerization and sufficient pores cannot be formed
Solution Approach 1:
The patent applies preliminary action by adding a bubble stabilizer to the monomer composition before polymerization begins. This stabilizer prevents bubble collapse during the polymerization process, ensuring that bubbles generated by the blowing agent are maintained throughout the reaction. The bubble stabilizer creates a protective film around bubbles, preventing their premature dissolution or collapse, thereby enabling sufficient pore formation in the final superabsorbent polymer product.
Solution Approach 2:
The bubble stabilizer acts as an intermediary substance between the blowing agent and the polymerizing monomer composition. It mediates the interaction by stabilizing the bubbles generated by the blowing agent, preventing their loss, and allowing them to serve their intended function of creating porous structure. The stabilizer facilitates the transfer of the blowing agent's bubble-generating capability into the final porous polymer structure without bubble loss.
2Area of stationary object
If a bubble stabilizer is used together with a blowing agent to reduce bubble loss, then sufficient pores can be formed in superabsorbent polymer, but surface tension of superabsorbent polymer deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the concentration and type of bubble stabilizer used in the monomer composition. By optimizing the stabilizer concentration within specific ranges and selecting stabilizers with appropriate molecular weights and chemical structures, the patent achieves sufficient pore formation while minimizing the deterioration of surface tension. This parameter optimization allows the system to balance pore formation requirements with surface tension maintenance.
3Speed
If existing blowing agents are used to form bubbles in monomer composition, then absorption speed can be improved through porous structure, but bubbles are lost before polymerization and gel strength deteriorates
Solution Approach 1:
The patent applies composite materials by combining multiple components in the monomer composition: acrylic acid-based monomers, crosslinking agents, blowing agents, and bubble stabilizers. This composite formulation creates a synergistic system where the crosslinking agent forms a three-dimensional network that provides gel strength, while the blowing agent generates bubbles that create porous structure for rapid absorption. The bubble stabilizer ensures both components work effectively together by preventing bubble loss during polymerization, allowing the composite material to achieve both high absorption speed and adequate gel strength.
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 composition enables superabsorbent polymers with rapid absorption speed and excellent gel strength, maintaining shape under pressure, and is suitable for incorporation into absorbent articles.
Implementation Method 1
a method of adding a blowing agent to conduct polymerization while bubbles are formed in the monomer composition, thereby forming a porous structure in superabsorbent polymer
Implementation Method 2
when irradiating heat and/or light to the monomer composition for preparing superabsorbent polymer to progress a polymerization reaction
Data Source
AI summary
This invention relates to a monomer composition for preparing superabsorbent polymer. The superabsorbent polymer is subsequently incorporated into an absorbent article. Since the monomer composition for preparing superabsorbent polymer of the invention has rapid polymerization speed and thus can minimize bubble loss during blowing polymerization, it can provide superabsorbent polymer having excellent absorption speed. And, since superabsorbent polymer prepared from the monomer composition for preparing superabsorbent polymer has high gel strength and thus maintains the shape well even after moisture absorption, it may exhibit excellent absorption performance in spite of external pressure.