Biomass Polyester Resin Copolymerization for Heat Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional polyester resins derived from fossil resources face limitations in heat-resistance and color stability, particularly when attempting to enhance heat-resistance through stretching or crystallization, and existing methods using isosorbide as a biomass co-monomer struggle to achieve high intrinsic viscosity for applications like sheets and bottles.
Innovation Solution
A polyester resin is developed through copolymerization of terephthalic acid, isosorbide, ethylene glycol, and lactic acid or its derivatives, with specific mole ratios and reaction conditions to achieve a high biomass content, superior heat-resistance, and improved color stability, suitable for various applications including films, sheets, and bottles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If isosorbide is used as a co-monomer to enhance heat-resistance, then heat-resistance is improved, but intrinsic viscosity remains low making it unsuitable for sheet and bottle applications
Solution Approach 1:
The patent changes the chemical parameters of the polymerization reaction by introducing lactic acid as a third monomer component with specific functional groups. This modifies the polymer chain structure to achieve both high heat-resistance (through isosorbide units) and high intrinsic viscosity (through lactic acid-derived rigid segments), resolving the contradiction between these two properties.
Solution Approach 2:
The patent creates a composite polyester resin system combining three different monomer types: terephthalic acid (for base polymer structure), isosorbide (for heat-resistance), and lactic acid (for viscosity enhancement). This composite approach allows each component to contribute its unique properties, achieving both high heat-resistance and high intrinsic viscosity simultaneously.
2Ease of manufacture
If copolymerization with multiple glycol or dicarboxylic acid components is used to improve formability, then formability is enhanced, but heat-resistance cannot be enhanced through stretching or crystallization
Solution Approach 1:
The patent applies local quality by introducing specific functional groups from lactic acid at localized positions within the polymer chain. These lactic acid-derived units create localized rigid segments that promote crystallization and enhance heat-resistance, while the overall copolymer structure maintains good formability through the flexible terephthalic acid and isosorbide segments.
Solution Approach 2:
The patent changes the chemical composition parameters by incorporating lactic acid units with carboxyl and hydroxyl groups that can form hydrogen bonds and promote crystallization. This chemical parameter change enables the copolymer to achieve both good formability (from copolymer structure) and enhanced heat-resistance (from crystallization capability).
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 resulting resin exhibits enhanced heat-resistance and color stability with high intrinsic viscosity, making it suitable for diverse applications while maintaining a high biomass content, thus addressing the limitations of conventional methods.
Implementation Method 1
the copolymerisation of lactic acid and isosorbide
Data Source
AI summary
A polyester resin with a superior heat-resistance and color as well as high content of a compound derived from biomass due to copolymerization of lactic acid or a compound derived therefrom and isosorbide, and a method for preparing the same are disclosed. The polyester resin is copolymerized with diacid components including terephthalic acid; diol components including 1 to 60 mol% of isosorbide and 1 to 90 mol% of ethylene glycol with respect to total diol components; and 1 to 50 weight% of lactic acid or a compound derived therefrom with respect to total reactants for resin polymerization, wherein, the polyester resin has the repeated structure of diacid moiety derived from the diacid components, diol moiety derived from the diol components and hydroxy monoacid moiety derived from the lactic acid or the compound derived therefrom.