Fluid-absorbent core with composite polymer particles
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Solution Overview
Problem
Current ultrathin fluid-absorbent products face deficiencies in fluid acquisition, leakage, and rewet properties, which are exacerbated by the need for thicker acquisition-distribution layers that contradict the trend towards thinner absorbent articles, particularly in adult and baby diapers.
Innovation Solution
A fluid-absorbent core comprising two layers, with the upper layer containing a mixture of water-absorbent polymer particles G and H, where G is agglomerated using a specific binder and solvent solution, and the lower layer having high CRC and vortex values, optimizing fluid storage and absorption without increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the proportion of cellulose fibers is lowered to produce thin disposable diapers, then the thickness is reduced, but the fluid acquisition, leakage and rewet properties deteriorate
Solution Approach 1:
The patent uses composite water-absorbent polymer particles comprising a porous core made of first polymer particles and a shell made of second polymer particles with different absorption characteristics. This composite structure enables thin diaper design while maintaining fluid acquisition, leakage, and rewet properties through the synergistic effects of the two polymer types.
Solution Approach 2:
The invention creates particles with non-uniform structure where the core and shell have different properties - the porous core provides rapid fluid acquisition while the shell controls rewet characteristics. This local differentiation of material properties within each particle allows simultaneous optimization of multiple performance parameters in a thin configuration.
2Reliability
If thicker acquisition-distribution layers are used to prevent leakage and wet feeling, then the leakage and rewet properties improve, but the thickness increases
Solution Approach 1:
The composite particles with dual polymer structure provide enhanced fluid handling capabilities within reduced thickness. The first polymer in the core excels at rapid absorption while the second polymer in the shell provides controlled release, eliminating the need for thicker acquisition-distribution layers.
Solution Approach 2:
The invention changes the physical and chemical parameters of the water-absorbent particles by creating a bimodal particle population with different pore structures, polymer types, and absorption kinetics. This parameter optimization allows thin design while maintaining leakage and rewet protection.
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 solution enhances fluid acquisition, storage capacity, and rewet performance, preventing leakage while maintaining a thin profile, thus addressing the limitations of existing ultrathin products.
Implementation Method 1
a water absorbent mixture comprising at least 10% by weight of a first type of water-absorbent polymer particles, water-absorbent polymer particles G, with a vortex of less than 30s and at least 50% by weight of a second type of water-absorbent polymer particles, water-absorbent polymer particles H, with a CRC of at least 25 g/g
Implementation Method 2
water-absorbent polymer particles G, with a vortex of less than 30s and at least 50% by weight of a second type of water-absorbent polymer particles, water-absorbent polymer particles H, with a CRC of at least 25 g/g
Implementation Method 3
by using a solution or suspension comprising a) 0,04 to 1,2 % by weight water-soluble or water-dispersible polymeric binders or a mixture thereof, based on the water-absorbent polymer particles, b) 20 to 70% by weight of water based on the water-absorbent polymer particles
Implementation Method 4
c) 5 to 20% by weight of a water-miscible organic solvent based on the water-absorbent polymer particles
Data Source
Figure 1~2
Figure 3
AI summary
The present invention relates to a fluid-absorbent core (80) comprising at least two layers, an upper layer (91) and a lower layer (92), each layer comprising from 0 to 10% by weight fibrous material and from 90 to 100% by weight water-absorbent polymer particles, based on the sum of water-absorbent polymer particles and fibrous material, wherein within the upper layer (91) a water absorbent mixture comprising at least 10% by weight of a first type of water-absorbent polymer particles, water-absorbent polymer particles G, with a vortex of less than 30s and at least 50% by weight of a second type of water-absorbent polymer particles, water-absorbent polymer particles H, with a CRC of at least 25 g/g and a fluid-absorbent article comprising said fluid-absorbent core (80).