Plasticizer Composition for Resin Mechanical Properties
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Solution Overview
Problem
Existing plasticizer compositions, such as those based on di(2-ethylhexyl) terephthalate, face challenges including high hardness, slow absorption rate, poor migration resistance, and stress degradation, while also being costly and lacking eco-friendliness.
Innovation Solution
A plasticizer composition obtained through a trans-esterification reaction between 2-ethylhexyl(2-hydroxyethyl) terephthalate and di(2-ethylhexyl) terephthalate, using n-butanol, which includes 2-ethylhexyl(2-hydroxyethyl) terephthalate, di(n-butyl) terephthalate, (n-butyl)(2-ethylhexyl) terephthalate, and di(2-ethylhexyl) terephthalate, with a focus on incorporating 2-ethylhexyl(2-hydroxyethyl) terephthalate in a controlled amount to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If di(2-ethylhexyl) terephthalate is applied as a plasticizer, then cost competitiveness is improved, but mechanical properties and migration resistance deteriorate
Solution Approach 1:
The patent combines multiple plasticizer components (DEHTP, DBTP, BOTP, and 2-ethylhexyl(2-hydroxyethyl) terephthalate) into a composite plasticizer composition. This merging approach allows the system to leverage the cost advantage of DEHTP while compensating for its poor mechanical properties and migration resistance through the synergistic effects of the other components, particularly the hydroxyethyl terephthalate derivative which improves stress resistance and migration characteristics.
Solution Approach 2:
The invention creates a composite plasticizer system comprising four different terephthalate-based plasticizers with varying molecular structures and properties. This composite approach enables the formulation of a plasticizer composition that achieves a balance between cost, mechanical properties, migration resistance, and stress degradation resistance, overcoming the limitations of any single component.
2Productivity
If DEHTP is used to improve cost competitiveness, then absorption rate is improved, but hardness and sol viscosity increase
Solution Approach 1:
The patent modifies the molecular parameters of the plasticizer system by introducing plasticizers with different molecular weights and structural characteristics. The inclusion of di(n-butyl) terephthalate (lower molecular weight) and (n-butyl)(2-ethylhexyl) terephthalate (intermediate molecular weight) compensates for the high viscosity and hardness associated with DEHTP, while maintaining the rapid absorption rate through the presence of the hydroxyethyl terephthalate derivative which enhances compatibility with the polymer matrix.
3Productivity
If trans-esterification reaction products are used to improve plasticization efficiency, then mechanical properties are lowered and plasticizer leakage increases
Solution Approach 1:
The patent extracts and isolates specific beneficial components from the complex mixture of trans-esterification reaction products. By selectively identifying and incorporating only the useful plasticizer components (DEHTP, DBTP, BOTP, and 2-ethylhexyl(2-hydroxyethyl) terephthalate) while excluding harmful by-products and unreacted materials, the invention achieves improved plasticization efficiency without the negative effects of mechanical property degradation and plasticizer leakage associated with using crude reaction products.
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 proposed plasticizer composition achieves improved mechanical properties, migration resistance, stress resistance, and absorption rate compared to traditional plasticizers, while being eco-friendly and cost-competitive by utilizing recycled polyethylene terephthalate as a raw material.
Implementation Method 1
a plasticizer composition obtained by a trans-esterification reaction between 2-ethylhexyl(2-hydroxyethyl) terephthalate and di(2-ethylhexyl) terephthalate, which are obtainable during a decomposition process of polyethylene terephthalate, and n-butanol
Data Source
AI summary
A plasticizer composition includes 2-ethylhexyl(2-hydroxyethyl) terephthalate, di(n-butyl) terephthalate, (n-butyl)(2-ethylhexyl) terephthalate, and di(2-ethylhexyl) terephthalate, wherein the content of the 2-ethylhexyl(2-hydroxyethyl) terephthalate is 20 wt % or less, based on the total plasticizer composition, and when the plasticizer composition is applied to a resin, mechanical properties, migration resistance, and loss properties may be improved.