Water-Soluble Fiber Modification for Tunable Solubility Profiles
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Solution Overview
Problem
Traditional nonwoven water-soluble fibers are unsustainable, non-biodegradable, and contribute to microplastic pollution, with existing methods limiting the adjustment of solubility profiles and properties post-fiber formation, making it difficult to achieve desired solubility and compatibility for various applications.
Innovation Solution
Chemical modification of fibers by contacting them with a modification agent to alter the polymer composition, allowing for changes in solubility profiles and properties post-manufacturing, such as creating core-sheath structures or gradients in modification levels within the fibers, using agents like glutaric anhydride, maleic anhydride, or phthalic anhydride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If chemical modifications are applied to fiber forming materials to achieve desired solubility profiles, then solubility control is improved, but the ability of the fiber forming material to form fibers deteriorates
Solution Approach 1:
The patent segments the fiber structure into core and sheath regions with different polymer compositions and modification levels. The core contains unmodified or less modified polymer that maintains fiber formation capability, while the sheath contains highly modified polymer that provides desired solubility profile. This segmentation allows both fiber formation and solubility control to coexist.
Solution Approach 2:
The patent applies different degrees of chemical modification to different regions of the fiber. The core region has lower modification level (better fiber formation), while the sheath region has higher modification level (better solubility control). This local differentiation resolves the contradiction by optimizing each region for its specific function.
2Adaptability or versatility
If post-process modifications are applied to fibers after formation, then solubility profile adjustment is improved, but process complexity increases
Solution Approach 1:
The patent incorporates chemical modification groups into the fiber structure during the fiber formation process itself, rather than requiring separate post-process modification steps. The copolymer is designed with hydrolyzable groups that can be converted to hydroxyl groups in situ, providing solubility adjustment capability built into the fiber structure.
Solution Approach 2:
The patent uses parameter changes (degree of hydrolysis, copolymer composition ratios) to control solubility profiles. By adjusting these parameters during fiber formation, different solubility characteristics can be achieved without adding complex post-processing equipment or steps.
3Ease of manufacture
If traditional chemistries are used in nonwoven products, then manufacturing ease is maintained, but environmental sustainability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the fibers by incorporating hydrolyzable groups (such as acetate groups) that can be converted to hydroxyl groups. This creates water-soluble or biodegradable fibers that maintain ease of manufacture while eliminating microplastic pollution and improving biodegradability.
Solution Approach 2:
The patent uses composite polymer systems combining water-soluble polymers with hydrolyzable groups. These composite materials provide both the manufacturing ease of traditional synthetics and the environmental benefits of biodegradability and water solubility, resolving the contradiction between ease of manufacture and environmental sustainability.
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
Enables control over microstructure, solubility, chemical compatibility, and release mechanisms of fibers, enhancing their absorbency, tensile strength, and processability, allowing for tailored properties and applications, including flushability and improved disposal methods.
Implementation Method 1
contacting the fiber or a surface thereof with a modification agent to chemically modify at least a portion of the polymer with the modification agent
Data Source
AI summary
Methods of treating fibers comprising a polymer including at least one of a vinyl acetate moiety or a vinyl alcohol moiety, and resulting fibers or the products comprising the resulting fibers are disclosed. In an example embodiment, a method of treating fibers includes contacting a surface of a fiber comprising the polymer with a modification agent to chemically modify at least a portion of the polymer with the modification agent in a region of the fiber comprising at least the surface of the fiber to form a modified fiber.