Water Absorbing Resin Internal Structure Control
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Solution Overview
Problem
Conventional methods fail to achieve optimal physical properties in water absorbing resins, particularly balancing centrifuge retention capacity and saline flow conductivity, and improving the internal structure of these resins remains a challenge for enhancing their performance in sanitary products.
Innovation Solution
A water absorbing resin is manufactured through polymerization of a water-soluble unsaturated monomer with a thermally decomposing radical initiator content index between 40 to 100 and dried at 100 to 250°C, incorporating an internal crosslinking agent, which improves the internal structure and enhances physical properties such as centrifuge retention capacity, saline flow conductivity, and absorbency against pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the ratio of water absorbing resin is increased to reduce thickness, then thickness is reduced, but manufacturing precision of internal structure becomes more difficult to control
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thermally decomposing radical initiator content index (40-100) and drying temperature (100-250°C) to achieve the desired internal structure. This resolves the contradiction by providing specific parameter ranges that enable both thickness reduction and internal structure precision control through optimized polymerization and drying conditions.
2Reliability
If conventional polymerization methods are used, then manufacturing is simpler, but physical properties such as centrifuge retention capacity and saline flow conductivity are insufficient
Solution Approach 1:
The patent changes key parameters including initiator content index (40-100), drying temperature (100-250°C), and monomer composition to achieve superior physical properties. These parameter changes resolve the contradiction by providing an optimized manufacturing process that delivers enhanced centrifuge retention capacity and saline flow conductivity while maintaining practical manufacturability.
3Manufacturing precision
If drying temperature is increased to improve internal structure, then internal structure improves, but energy consumption increases
Solution Approach 1:
The patent optimizes the drying temperature parameter within the range of 100-250°C to achieve the desired internal structure while balancing energy consumption. This resolves the contradiction by identifying an optimal temperature window that provides sufficient thermal energy for structure development without excessive energy input, compared to conventional higher temperature drying.
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 improved internal structure of the water absorbing resin results in enhanced physical properties, including increased centrifuge retention capacity, saline flow conductivity, and reduced liquid seeping under pressure, leading to an excellent liquid acquisition rate per unit time in water absorbent cores.
Implementation Method 1
polymerization of a water-soluble unsaturated monomer with a thermally decomposing radical initiator content index between 40 to 100 and dried at 100 to 250°C
Implementation Method 2
polymerization of a water-soluble unsaturated monomer... incorporating an internal crosslinking agent
Implementation Method 3
water absorbent cores... to absorb body fluids... enhanced physical properties, including increased centrifuge retention capacity, saline flow conductivity
Implementation Method 4
improved internal structure... enhanced physical properties... excellent liquid acquisition rate per unit time
Data Source
AI summary
According to the present invention, the manufacturing method for the water absorbing resin involves the step of polymerizing a water-soluble unsaturated monomer, 0.06 of 5 mol % of which is composed of an internal crosslinking agent; and the step of drying a water-containing gel which has a thermally decomposing radical initiator content index of 40 to 100 at 100 to 250° C. The water absorbing resin of the present invention contains a water-soluble unsaturated monomer as a repeat unit for a major chain, 90 mol % of the monomer being composed of an acrylic acid and/or salt thereof, the resin having an internal crosslinking structure and exhibiting a weight-average molecular weight Mw of 360,000 to 1,000,000 daltons and an intrinsic viscosity IV of 2.1 to 6.0 dL/g where the weight-average molecular weight Mw and the intrinsic viscosity IV are measured after treatment under set 2 of hydrolysis conditions.