Polyvinyl Alcohol Fiber Hydrogel Formation via Tempering
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Solution Overview
Problem
Current methods for producing hydrogel fibers for wound dressings are complex, prone to chemical impurities, and have limited absorption capacity due to smaller surface area, with existing fibers lacking high tensile strength and elongation, making them difficult to remove intact and potentially damaging to wounds during removal.
Innovation Solution
Development of two- or three-dimensional fiber structures from water-soluble polyvinyl alcohol and/or polyvinyl alcohol copolymers, treated with aqueous solutions to form stable hydrogels with high tensile force and elongation, absorption, and retention capacity, using a tempering process that crosslinks the fibers at specific temperatures and times to enhance stability and hydrogel formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogel fibers are produced using conventional methods (freezing-thawing, chemical crosslinking, or radiation), then hydrogel formation is achieved, but the production process becomes complex and chemical impurities may occur
Solution Approach 1:
The patent extracts and eliminates the complex production steps (freezing-thawing cycles, chemical crosslinking reagents, radiation equipment) from the hydrogel production process. Instead, it uses a simple tempering treatment at elevated temperatures (60-100°C) to achieve stable hydrogel formation from polyvinyl alcohol fibers, thereby removing the disturbing complex processes while maintaining hydrogel functionality.
Solution Approach 2:
The patent replaces expensive and complex production equipment (radiation sources, chemical crosslinking systems, freezing-thawing apparatus) with a simple, inexpensive tempering process that can be performed in conventional drying ovens or heat treatment equipment, making the production method accessible and economically viable.
2Reliability
If polyvinyl alcohol fibers are used for wound dressings, then high biocompatibility is achieved, but the fibers lack sufficient tensile strength and elongation for easy removal
Solution Approach 1:
The patent changes the physical-chemical parameters of polyvinyl alcohol fibers through controlled tempering at specific temperatures (60-100°C) for defined periods. This heat treatment modifies the molecular structure and crystallinity of the fibers, transforming them from water-soluble to water-insoluble form, thereby achieving both high biocompatibility and enhanced tensile strength with elongation of 100-300% for easy wound removal.
3Reliability
If conventional hydrogel production methods are used, then hydrogel formation is achieved, but absorption capacity is limited due to smaller surface area
Solution Approach 1:
The patent transitions from producing hydrogels in conventional forms (films, small particles) to creating three-dimensional fiber structures with high surface area-to-volume ratios. The fibrous morphology provides extensive surface area for wound contact, enabling superior absorption capacity while maintaining stable hydrogel formation through the tempering treatment.
4Ease of manufacture
If water-soluble polyvinyl alcohol is used without tempering, then easy processing is achieved, but the fibers dissolve in aqueous solutions instead of forming stable hydrogels
Solution Approach 1:
The patent applies a preliminary tempering treatment to polyvinyl alcohol fibers before they come into contact with wound exudate or aqueous solutions. This pre-treatment at 60-100°C converts the fibers to a water-insoluble state, ensuring they will not dissolve when applied to wounds but will instead form stable hydrogels, thereby preparing the material in advance to prevent the harmful dissolution effect.
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 treated fibers form stable hydrogels with high absorption and retention capacities, allowing for easy removal from wounds and improved wound care by creating a moist environment conducive to healing without sticking, while reducing impurities and enhancing biocompatibility.
Implementation Method 1
the fiber raw material being crosslinked by the annealing
Implementation Method 2
the fibers or the fiber structures according to the invention are characterised in that they are treated by tempering
Implementation Method 3
have a particularly high absorption capacity and a particularly high retention capacity for aqueous solutions
Implementation Method 4
Products for wound care made from the fiber structures according to the invention swell with aqueous solutions or wound exudate and form a stable hydrogel
Data Source
Figure 1
AI summary
One-, two-, or three-dimensional hydro-gelled fibers or fiber structure produced from fibers of a first fiber raw material including a water-soluble polyvinyl alcohol and/or polyvinyl alcohol copolymer, is claimed. The hydro-gelling of the fiber or the fiber structure includes tempering the fiber raw material at a predetermined tempering temperature that is greater than a glass transition temperature and/or is less than a melting temperature or decomposition temperature of the used first fiber raw material for a predetermined tempering duration and crosslinking the fiber raw material. Independent claims are also included for: (1) preparing the hydro-gelled fibers or fiber structures, comprising tempering the above mentioned fibers or fiber structures at a predetermined tempering temperature, which is greater than a glass transition temperature and/or is less than a melting temperature of the used first fiber raw material for a predetermined tempering duration such that the fibers are crosslinked; and (2) wound dressings or wound coverings comprising the above mentioned fibers or fiber structures produced by the above mentioned method.