Carboxymethyl Cellulose Core-Shell Particles for Blood Absorbency
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Solution Overview
Problem
Conventional superabsorbent polymers, such as acrylic absorbent resins, exhibit toxicity and poor blood absorbency, leading to discomfort and inefficiency in feminine hygiene products due to non-uniform cross-linking and low absorbency under load.
Innovation Solution
A method for manufacturing carboxymethyl cellulose (CMC) particles with a core-shell structure by reacting a CMC cross-linked body with a core cross-linker followed by a surface cross-linker, enhancing gel strength, absorbency, and retention capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional superabsorbent polymers (acrylic absorbent resins) are used, then high absorbability is achieved, but toxicity and poor blood absorbency occur
Solution Approach 1:
The patent changes the chemical composition parameter from synthetic acrylic resin to natural cellulose derivative (CMC), fundamentally altering the material's properties to eliminate toxicity while maintaining absorbency through the cross-linked gel structure formed by reacting CMC with cross-linkers
Solution Approach 2:
The patent creates a composite structure by combining CMC with cross-linkers to form a cross-linked gel, and further develops a core-shell structure by reacting the CMC cross-linked body with a surface cross-linker, achieving both safety and enhanced blood absorbency
2Stability of the object's composition
If conventional cross-linking methods are used, then gel formation is achieved, but non-uniform cross-linking and low absorbency under load occur
Solution Approach 1:
The patent divides the cross-linking process into two distinct stages: core cross-linking (reacting CMC with core cross-linker) and surface cross-linking (reacting CMC cross-linked body with surface cross-linker). This segmentation allows each stage to optimize for its specific function, achieving uniform cross-linking throughout the gel structure and improving absorbency under load
Solution Approach 2:
The patent performs core cross-linking first to establish a uniform cross-linked body, then applies surface cross-linking to the already-formed structure. This preliminary action ensures that the base gel is uniformly cross-linked before adding the surface layer, preventing non-uniform cross-linking and enhancing overall gel strength and absorbency
3Quantity of substance
If conventional CMC processing methods are used, then superabsorbent particles are obtained, but poor blood absorbency and low centrifuge retention capacity occur
Solution Approach 1:
The patent applies different cross-linking densities to different regions of the CMC gel: the core region has cross-linking from the first cross-linker while the surface region has cross-linking from the second cross-linker. This local quality differentiation optimizes the surface properties for blood absorbency and centrifuge retention capacity while maintaining the bulk superabsorbent properties
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 CMC particles demonstrate improved blood absorbency, absorbency under load, and centrifuge retention capacity, addressing the limitations of existing superabsorbent materials for feminine hygiene products.
Implementation Method 1
reacting a CMC cross-linked body having undergone a core cross-linking step with a surface cross-linker to obtain CMC having a core-shell structure
Implementation Method 2
the CMC particles demonstrate improved blood absorbency, absorbency under load
Implementation Method 3
a superabsorbent polymer (hereinafter referred to as 'SAP') is a functional material that may absorb water in an amount several tens to several thousands of times its own weight
Implementation Method 4
centrifuge retention capacity
Data Source
AI summary
The present disclosure relates to a method for manufacturing carboxymethyl cellulose particles, cellulose inducer particles manufactured by the method, and an absorbent article comprising same. The method comprises: (1) a step of obtaining alkalized cellulose by reacting a cellulose raw material with an alkalizer; (2) a step of obtaining carboxymethyl cellulose by reacting the alkalized cellulose with a carboxy methylating agent; (3) a primary cross-linking step of obtaining a slurry-phase carboxymethyl cellulose cross-linked body by reacting the carboxymethyl cellulose with a core cross-linker; (4) a step of washing and dehydrating after filtering the slurry-phase carboxymethyl cellulose cross-linked body; (5) a secondary cross-linking step of obtaining carboxymethyl cellulose having a core-shell structure by reacting the carboxymethyl cellulose cross-linked body having undergone Step (4) with a surface cross-linker; and (6) a step of obtaining carboxymethyl cellulose particles having a core-shell structure by drying and pulverizing the carboxymethyl cellulose having a core-shell structure.