Polyether Ester Polyol Composition for High-Recovery Polyurethane Fibers
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Solution Overview
Problem
Existing polyurethane fibers face challenges in achieving a high recovery modulus while minimizing plastic deformation, leading to issues with shape retention and service life in spandex-containing fabrics.
Innovation Solution
A polyether ester polyol with a specific repeating structure and end-capped alcohol hydroxyl group is used to prepare polyurethane fibers, incorporating aromatic or heteroaromatic rings and controlled molecular weight, functionality, and viscosity to enhance recovery modulus and reduce plastic deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the molecular weight of the polyol is reduced and the content of hard segments is increased, then the recovery modulus of spandex is improved, but the plastic deformation rate increases leading to permanent deformation
Solution Approach 1:
The invention changes the chemical structure parameters of the polyol by introducing aromatic rings (R1) and specific alkyl groups (R2) with controlled lengths, rather than simply adjusting molecular weight. This structural modification allows achieving high recovery modulus while maintaining resistance to plastic deformation through enhanced intermolecular interactions and crystallinity of soft segments
Solution Approach 2:
The invention creates a composite structure within the polyol molecule by combining aromatic rings, ether oxygens, and ester groups in a specific repeating unit structure. This composite molecular architecture provides both the rigidity needed for high recovery modulus and the flexibility required to resist plastic deformation
2Shape
If the molecular weight of the polyol is reduced to increase recovery modulus, then the shape retention of fabric is improved, but the service life decreases due to increased plastic deformation
Solution Approach 1:
The invention modifies the chemical composition parameters of the polyol by incorporating aromatic rings and controlling the structure of R2 groups, enabling the material to maintain shape retention while resisting permanent deformation over time, thus extending service life
3Strength
If the content of hard segments is increased to improve recovery modulus, then the elastic performance is enhanced, but the plastic deformation rate increases causing permanent deformation
Solution Approach 1:
Instead of increasing hard segment content, the invention changes the soft segment structure by introducing aromatic rings and specific alkyl groups, achieving high recovery modulus through enhanced soft segment crystallinity and intermolecular forces, thereby avoiding the harmful effect of increased plastic deformation
Data Source
AI summary
The present application relates to a polyether ester polyol, comprising a repeating structure of formula (1) and an end-capped alcohol hydroxyl group: wherein R1 is at least one selected from aromatic rings or heteroaromatic rings; R1 accounts for 4.5%-44% by mass in the repeating structure of formula (1); R2 is at least one selected from saturated alkyl groups having 2-5 carbon atoms, and x is 2-20; the mass percentage of the repeating structure of formula (1) in the polyether ester polyol is greater than 75%; the average functionality of the end-capped alcohol hydroxyl group is 1.95-2.00; the number-average molecular weight of the polyether ester polyol is 800-5000. The present application also relates to a preparation method for the polyether ester polyol, and a method for using the polyether ester polyol to prepare polyurethane elastic fibers or elastomers.