Water Absorbent Resin Classification Tension Control
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Solution Overview
Problem
Existing methods for producing water absorbent resins often result in decreased safety, increased costs, and reduced physical properties due to modifications in raw materials and additional production steps, leading to deteriorated liquid permeability during continuous production.
Innovation Solution
A method involving polymerization, drying, classification, and surface crosslinking of acrylic acid salts using a metal sieve mesh with specific tension and heating, and optionally an airbrush, to enhance liquid permeability without modifying raw materials or incurring high capital investment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If surface crosslinking is performed to enhance liquid permeability, then liquid permeability is improved, but manufacturing precision deteriorates due to physical property changes during continuous production
Solution Approach 1:
The patent applies parameter changes by controlling the temperature of the water absorbent resin during surface crosslinking to be within 20°C to 40°C. This temperature parameter control stabilizes the physical properties of the resin during the crosslinking process, preventing deterioration of liquid permeability and other properties during continuous production while still achieving the desired crosslinking effect
2Adaptability or versatility
If additional production steps are added to improve physical properties, then liquid permeability is enhanced, but device complexity increases and productivity decreases
Solution Approach 1:
The patent merges the surface crosslinking step with the existing production process flow, integrating it into the sequential steps of polymerization, drying, classification, and surface crosslinking. This consolidation approach enhances liquid permeability while maintaining processability and avoiding excessive complexity by using a straightforward sequential methodology
3Adaptability or versatility
If raw materials are modified to enhance physical properties, then liquid permeability is improved, but safety deteriorates and cost increases
Solution Approach 1:
The patent changes the temperature parameter of the water absorbent resin during surface crosslinking to within 20°C to 40°C, which stabilizes physical properties and enhances liquid permeability without requiring modification of the raw material composition. This approach improves performance while maintaining material safety and avoiding additional costs associated with new raw materials
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 stabilizes and enhances the physical properties of water absorbent resins, particularly liquid permeability, while maintaining productivity and reducing the production of substandard products during continuous operation.
Implementation Method 1
a classification step of classifying the water absorbent resin powder
Implementation Method 2
the metal sieve mesh is heated or kept warm to a temperature of 40°C or higher
Implementation Method 3
a surface crosslinking step of surface crosslinking the water absorbent resin powder
Data Source
AI summary
Provided is a method which does not require alteration of the raw materials or high capital investment, and improves and stabilizes the physical property (for example, liquid permeability) of a water absorbent resin by means of a simple technique. A method for producing a water absorbent resin is disclosed, which method includes a polymerization step of polymerizing an aqueous solution of acrylic acid (salt) to obtain a water-containing gel-like crosslinked polymer; a drying step of drying the water-containing gel-like crosslinked polymer to obtain a water absorbent resin powder; a classification step of classifying the water absorbent resin powder; and a surface crosslinking step of surface crosslinking the water absorbent resin powder, wherein in the classification steps that are carried before the surface crosslinking step and/or after the surface crosslinking step, the stretch tension (tension) of the metal sieve mesh used in the classification step is from 35 [N/cm] to 100 [N/cm].