Recycled Polyester Resin Blend for Better Film Extrudability
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Solution Overview
Problem
Existing polyester copolymers prepared using recycled monomers exhibit poor extrudability and transparency due to side reactants formed during the depolymerization process, limiting their use in applications requiring good physical properties.
Innovation Solution
A polyester resin mixture comprising a polyester copolymer with optimized types and amounts of recycled monomers, dicarboxylic acid compounds, and diol compounds, mixed with polyethylene terephthalate, is prepared through esterification and polycondensation reactions under controlled pressure and temperature, resulting in an extrudability coefficient of 6 or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyester copolymer is prepared using a recycled monomer obtained by depolymerization of waste polyester, then waste polyester is recycled and environmental sustainability is improved, but the polyester has poor extrudability and transparency due to side reactants formed during depolymerization
Solution Approach 1:
The patent changes the chemical parameters of the recycled monomer by controlling the depolymerization conditions (temperature, catalyst, time) to minimize side reactant formation. It also adjusts the composition parameters by blending the recycled monomer with virgin monomers in specific ratios and adding chain transfer agents to modify the polymer structure, thereby improving extrudability while maintaining sustainability
Solution Approach 2:
The patent converts the harmful side reactants (DEG esters) formed during depolymerization into beneficial components by adding specific diol compounds during polyesterification that react with these side reactants to form useful chain transfer agents, which actually improve the extrudability and processability of the final product
2Reliability
If a polyester copolymer is prepared using a recycled monomer obtained by depolymerization of waste polyester, then waste polyester is recycled and environmental sustainability is improved, but the polyester has poor transparency due to side reactants formed during depolymerization
Solution Approach 1:
The patent converts the harmful side reactants (DEG esters) that reduce transparency into beneficial components by reacting them with added diol compounds to form chain transfer agents. This eliminates the transparency-reducing side reactants while creating new functional components that improve overall material performance
Solution Approach 2:
The patent optimizes the transparency by controlling the molecular weight distribution through controlled depolymerization and polyesterification conditions, adjusting the ratio of recycled to virgin monomers, and adding specific additives that enhance optical clarity while maintaining the recycled content
3Quantity of substance
If a polyester copolymer is prepared using a recycled monomer, then recycled content is increased, but the polyester has poor processability due to side reactants formed during depolymerization
Solution Approach 1:
The patent optimizes processability by controlling the molecular weight and distribution through adjusted depolymerization conditions, optimizing the blend ratio of recycled to virgin monomers, and adding chain transfer agents during polyesterification to create a more processable polymer structure with appropriate viscosity characteristics
Solution Approach 2:
The patent transforms the side reactants (DEG esters) that harm processability into beneficial chain transfer agents by adding specific diol compounds during polyesterification. These converted side reactants actually improve flow characteristics and reduce processing difficulties
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 solution provides a polyester resin mixture with enhanced extrudability, transparency, and heat shrinkage, minimizing equipment contamination and enabling the production of high-quality polyester articles with a high recycled content.
Implementation Method 1
carrying out an esterification reaction at a pressure of 0 to 10.0 kgf/cm2 and a temperature of 150 to 300° C. to obtain a reactant
Implementation Method 2
subjecting the reactant to a polycondensation reaction to obtain a polyester copolymer
Data Source
AI summary
The present invention relates to: a polyester resin mixture comprising a polyester copolymer prepared using a recycled monomer; a method for preparing same; and a polyester film prepared thereby, wherein the polyester resin mixture has excellent extrusion properties (processability), and thus can provide a polyester film having excellent physical properties and/or quality.