Microporous Absorbent Core Structure for Fast Menstrual Fluid Uptake
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sanitary napkins experience slow absorption and side leakage due to menstrual blood clots accumulating on the absorbent core, leading to rewetting issues.
Innovation Solution
An absorbent core with a hyperbranched structure formed by modified acrylate and acrylic monomer, featuring different pore sizes in upper and lower layers, and a liquid storage cavity, enhanced by a hydrophilic and water-repellent layers with adhesive portions, to facilitate rapid absorption and prevent rewetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional absorbent core structure is used, then the structure is simple and easy to manufacture, but menstrual blood clots accumulate on the surface leading to slow absorption and side leakage
Solution Approach 1:
The absorbent core is divided into an upper permeable layer and a lower permeable layer with different pore sizes. The upper layer has larger pores for initial liquid reception, while the lower layer has smaller pores for capillary absorption, preventing blood clot accumulation and improving absorption speed.
Solution Approach 2:
Different regions of the absorbent core are given different properties: the upper permeable layer has larger pores for rapid liquid intake, while the lower permeable layer has smaller pores for capillary action. This local differentiation optimizes absorption performance throughout the core structure.
2Productivity
If the absorbent core has uniform pore sizes, then the structure is simple, but liquid transfer capacity is limited and rewetting occurs
Solution Approach 1:
The absorbent core is segmented into two permeable layers with different pore sizes. The upper layer's larger pores facilitate rapid liquid penetration, while the lower layer's smaller pores enhance capillary action and prevent rewetting, thereby increasing overall liquid transfer capacity.
Solution Approach 2:
The upper and lower permeable layers are designed with locally optimized pore sizes matched to their specific functions. This local quality differentiation maximizes liquid transfer efficiency and prevents rewetting throughout the absorbent core.
3Stability of the object's composition
If the absorbent core is bonded to the water-repellent bottom layer, then structural integrity is improved, but liquid storage cavity formation is hindered
Solution Approach 1:
The bonding structure is segmented into adhesive portions located on the side of the water-repellent bottom layer away from the absorbent core, while the vertical pore region remains adhesive-free. This segmentation allows the liquid storage cavity to form between the absorbent core and water-repellent bottom layer while maintaining structural integrity through adhesive bonding in other regions.
Solution Approach 2:
Different regions of the water-repellent bottom layer have different bonding properties: adhesive portions are provided on the sides away from the absorbent core for structural integrity, while the vertical pore region remains adhesive-free to form the liquid storage cavity. This local quality differentiation resolves the contradiction between bonding and cavity formation.
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 absorbent core achieves rapid absorption and storage of menstrual blood, preventing side leakage and rewetting, with improved capillary action and three-dimensional fluid storage functionality.
Implementation Method 1
by adjusting the pore sizes of the upper and lower layers of the absorbent core, the product can generate good capillary action, further improving liquid transfer capacity
Implementation Method 2
introduces a large number of active functional groups by adding a modified acrylate having a hyperbranched structure, which can react with an acrylic monomer to obtain an absorbent core with enhanced absorption performance
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
The present invention provides an absorption product, which comprises an absorption core body 1. The absorption core body 1 comprises: an upper permeable layer and a lower permeable layer, and the upper permeable layer and the lower permeable layer have an integrated polymer microporous foam structure, wherein a plurality of first permeable holes are provided in the upper permeable layer, a plurality of second permeable holes are provided in the lower permeable layer, and the aperture of the first permeable holes is larger than that of the second permeable holes. A hydrophilic surface layer 2 is provided on the upper surface of the absorption core body 1, and a water-repellent bottom layer 3 is provided on the lower surface thereof. The absorption core body 1 is obtained by reacting an acrylate monomer, modified acrylate, a cross-linking agent, a photoinitiator, an emulsifier and an initiator, wherein the modified acrylate is obtained by reacting the reaction product of isosorbide and glycidyl ether with acrylic acid. The present invention solves the problems of slow liquid absorption, side leakage and being prone to back seepage due to the accumulation of menstrual blood on the surface of the absorption core body; and has good application prospects.