Polyester Monofilament with High Melting Point and Tenacity
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Solution Overview
Problem
Current processes for producing polyesters from furandicarboxylate monomers do not effectively achieve high melting points and mechanical properties suitable for textile applications, such as high tenacity and low shrinkage, while also being derived from renewable resources.
Innovation Solution
A textile elementary monofilament is produced using a specific process involving transesterification and melt polycondensation of ethylene glycol and cyclohexanedimethanol furandicarboxylate units, with controlled temperature and pressure conditions, resulting in a polyester with a high melting point, tenacity, and low shrinkage, and optionally coated with a non-metallic adhesive composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional polyester synthesis processes are used, then production is simple, but melting point and mechanical properties are insufficient for textile applications
Solution Approach 1:
The patent applies parameter changes by precisely controlling the mole ratio of ethylene glycol to cyclohexanedimethanol units (0/100 to 20/80 mol/mol) and conducting polycondensation at specific temperatures (260-300°C) under controlled pressure (<100 mbar). These parameter optimizations enable the polyester to achieve a melting point ≥240°C while maintaining feasible manufacturing processes.
Solution Approach 2:
The patent creates a composite polyester structure by combining different glycol units (ethylene glycol and cyclohexanedimethanol) with furandicarboxylate units in specific ratios. This composite approach allows tuning of the melting point and mechanical properties while preserving renewable resource derivation and processability.
2Strength
If polyester composition is optimized for high tenacity, then mechanical strength improves, but elongation at break may be compromised
Solution Approach 1:
The patent applies local quality by creating specific local structures within the polyester chain through controlled incorporation of cyclohexanedimethanol units (20-100 mol%). These local structural variations provide both the strength from crystalline regions and the elongation from amorphous regions, achieving tenacity ≥2.5 cN/tex while maintaining elongation at break ≥10%.
3Quantity of substance
If furan ring content is increased to improve renewable resource derivation, then sustainability improves, but processing and mechanical properties may be affected
Solution Approach 1:
The patent maintains high furan ring content (≥25 wt%) while ensuring processability by optimizing the polycondensation parameters: temperature (260-300°C), pressure (<100 mbar), and catalyst selection. These parameter adjustments allow the high-furan-content polyester to be processed into monofilaments with desirable mechanical properties without sacrificing 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
The process yields a polyester monofilament with a melting point greater than 240°C, tenacity of at least 2.5 cN/tex, and elongation at break of over 10%, along with low shrinkage, making it suitable for textile applications and improving mechanical properties compared to prior art.
Implementation Method 1
A step of transesterification of a composition comprising a compound of furandicarboxylate type
Implementation Method 2
a melt polycondensation step performed at a temperature of greater than or equal to 260° C. and a pressure of less than 100 mbar
Implementation Method 3
said textile elementary monofilament having a melting point Tm of greater than or equal to 240° C.
Data Source
AI summary
The invention relates to a textile elementary monofilament consisting of a polyester, said textile elementary monofilament having a melting point Tm of greater than or equal to 240° C., a tenacity of greater than or equal to 2.5 cN/tex and an elongation at break of greater than or equal to 10%, and also to a process for producing such a monofilament.