Mixed Isophthalate Plasticizer Composition for Viscosity and Migration Control
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Solution Overview
Problem
Existing plasticizer compositions, such as di(2-ethylhexyl) isophthalate, suffer from high viscosity, slow absorption rate, poor migration and stress resistance, and volatile loss, leading to degraded mechanical properties and increased production costs.
Innovation Solution
A plasticizer composition comprising two or more isophthalates of the same carbon number type and one or more isophthalates of a different carbon number type, with a carbon number difference of 3 or less, to enhance viscosity stability, migration loss, and stress resistance while maintaining plasticization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If di(2-ethylhexyl) isophthalate (DEHIP) is used as a plasticizer, then cost is reduced and availability is improved, but viscosity is high, absorption rate is slow, and migration and stress resistance are poor
Solution Approach 1:
The patent uses a composite plasticizer system combining three specific isophthalate esters (DEHIP, DINP, and DNOP) in defined ratios. This composite approach leverages the cost-effectiveness of DEHIP while incorporating DINP and DNOP to compensate for migration and stress resistance deficiencies, achieving a balanced formulation that meets both economic and performance requirements
Solution Approach 2:
The patent optimizes the carbon number distribution of alkyl groups in the isophthalate esters, specifically selecting esters with carbon numbers in the range of C10-C14. This parameter optimization balances viscosity, absorption rate, and migration resistance by adjusting the molecular structure parameters of the plasticizer components
2Reliability
If a transesterification product with butanol is used to improve limitations of DEHIP, then plasticization efficiency is improved, but volatile loss increases and mechanical properties are degraded
Solution Approach 1:
The patent carefully selects the carbon number range of alkyl groups (C10-C14) in the isophthalate esters to optimize the balance between plasticization efficiency and volatile loss. This parameter control ensures that the plasticizer molecules are large enough to reduce volatility but not so large that they compromise plasticization efficiency
Solution Approach 2:
The composite formulation of three isophthalate esters with different carbon numbers creates a synergistic effect where the mixture achieves better plasticization efficiency than individual components while the combined structure reduces volatile loss compared to using a single lower molecular weight plasticizer
3Reliability
If a second plasticizer is mixed to compensate for defects, then physical properties may be improved, but unit cost increases and the change of physical properties is hard to predict
Solution Approach 1:
The patent establishes specific carbon number ranges (C10-C14) and defined ratios for the three isophthalate esters, creating a standardized composition that predicts physical properties reliably. This parameter specification reduces composition complexity by providing clear guidelines for formulation
Solution Approach 2:
The patent assigns specific functional roles to each plasticizer component: DEHIP provides cost-effectiveness and base plasticization, while DINP and DNOP contribute to migration and stress resistance. This functional differentiation within the composite allows predictable property enhancement without excessive complexity
Data Source
AI summary
The present disclosure relates to a plasticizer composition characterized in including two or more isophthalates of the same carbon number type, in which alkyl groups bonded to two ester groups have the same carbon number; one or more isophthalates of a different carbon number type, in which alkyl groups bonded to two ester groups have different carbon numbers; wherein the different carbon number type includes both a higher alkyl and a lower alkyl, the carbon number of the higher alkyl is 8 to 10, and the carbon number of the lower alkyl is selected from 5 to 7, thereby, when applied to a resin, showing improved viscosity stability, migration resistance and stress resistance, while maintaining and improving plasticization efficiency and mechanical properties to the same or better level.