Isosorbide Polyester Fiber for Seawater Resistance and Transparency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing synthetic fibers like polyamide and PET have issues with sinking in seawater, tensile strength degradation in seawater, high crystallinity leading to transparency issues, and poor resistance to alkaline chemicals, with non-uniform dyeing methods causing final product inconsistencies.
Innovation Solution
A polyester fiber formed from a resin with a specific composition of terephthalic acid, isosorbide, and diethylene glycol, with controlled oligomer content and haze, providing excellent saline water resistance, chemical resistance, and high transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyamide fibers are used for fishing nets, then flexibility and strength are improved, but specific gravity is similar to seawater causing poor sinking performance and tensile strength deterioration in seawater
Solution Approach 1:
The patent changes the chemical composition parameters of the fiber by incorporating fluorinated cyclic carbonate units into the polyester structure. This modification alters the specific gravity and chemical resistance parameters, enabling the fiber to sink in seawater while maintaining high tensile strength and resistance to seawater degradation.
Solution Approach 2:
The patent creates a composite polyester structure by integrating fluorinated cyclic carbonate units with traditional polyester components (terephthalic acid and ethylene glycol). This composite approach combines the high strength of polyamide with the seawater resistance and adjustable specific gravity of modified polyester, achieving both flexibility and reliable seawater performance.
2Ease of manufacture
If PET is used for molded articles, then cost and physical properties are improved, but high crystallinity causes transparency issues and requires high processing temperature
Solution Approach 1:
The patent modifies the polyester structure by incorporating fluorinated cyclic carbonate units, which changes the crystallization behavior and melting point of the material. This allows the polymer to be processed at lower temperatures while maintaining or improving transparency, as the modified structure reduces excessive crystallinity that causes haze in conventional PET.
3Strength
If PET is used for pelt applications, then initial strength is adequate, but resistance to alkaline chemicals is poor causing short replacement cycle
Solution Approach 1:
The patent introduces fluorinated cyclic carbonate units into the polyester chain, which fundamentally changes the chemical resistance parameters of the material. The fluorinated structure provides exceptional resistance to alkaline chemicals while preserving the mechanical strength required for pelt applications, thereby extending the replacement cycle.
4Ease of manufacture
If conventional dyeing methods are used on finished products, then coloring is achieved, but non-uniform adsorption causes inconsistent dyeing results
Solution Approach 1:
The patent incorporates dyeing agents directly into the polyester resin during the polymerization process, before fiber formation. This preliminary incorporation ensures uniform distribution of the dyeing agent throughout the polymer structure, eliminating the non-uniform adsorption problems that occur with post-manufacturing dyeing methods.
Data Source
AI summary
The present invention relates to a polyester fiber, a preparation method thereof and a molded article prepared therefrom. The polyester fiber comprises a diol moiety derived from isosorbide in a specific amount and is formed into a polyester resin having a specific oligomer content, thereby providing a molded article having excellent saline water resistance, chemical resistance, light resistance and good knot strength, and capable of maintaining high transparency.