Mixed Ester Plasticizer Composition for Low-Viscosity PVC Plastisols
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Solution Overview
Problem
Trimethyl esters of cyclohexane-1,2,4-tripropionic acid exhibit high viscosity and significant evaporation when used as plasticizers in PVC-based plastisols, leading to incomplete retention in the end product.
Innovation Solution
A mixed ester composition of cyclohexane-1,2,4-tripropionic acid with varying proportions of methyl and C2- to C10-alkyl radicals, combined with additional plasticizers, to enhance performance properties and reduce evaporation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If trimethyl esters of cyclohexane-1,2,4-tripropionic acid are used as plasticizers, then the plasticizer provides low gelation temperature, but the plastisol exhibits high viscosity and significant evaporation occurs
Solution Approach 1:
The patent changes the chemical composition parameters of the plasticizer by using mixed esters with different alkyl groups (methyl, ethyl, propyl, butyl radicals) instead of uniform trimethyl esters. This composition modification alters the gelation temperature while simultaneously reducing viscosity and evaporation, resolving the technical contradiction between temperature control and operational ease.
Solution Approach 2:
The invention creates a composite plasticizer system by combining multiple ester types (methyl, ethyl, propyl, butyl esters of cyclohexane-1,2,4-tripropionic acid) in specific ratios. This composite approach allows the plasticizer mixture to achieve both low gelation temperature and reduced viscosity/evaporation, overcoming the limitations of single-component trimethyl esters.
2Temperature
If trimethyl esters of cyclohexane-1,2,4-tripropionic acid are used as plasticizers, then the plasticizer provides low gelation temperature, but a not inconsiderable proportion of the trimethyl ester evaporates and no longer remains in the end product
Solution Approach 1:
The patent modifies the molecular weight and chemical composition parameters of the plasticizer by incorporating heavier alkyl groups (ethyl, propyl, butyl radicals) alongside methyl groups. This parameter change reduces the volatility and evaporation tendency while maintaining the low gelation temperature property, thus resolving the contradiction between temperature control and substance retention.
Solution Approach 2:
The invention develops a composite plasticizer formulation containing multiple ester components with different volatilities. The mixture of methyl, ethyl, propyl, and butyl esters creates a synergistic effect where the less volatile components compensate for the evaporation of more volatile ones, ensuring both low gelation temperature and minimal substance loss in the final product.
3Ease of operation
If mixed esters with C2- to C10-alkyl radicals are used instead of trimethyl esters, then viscosity is reduced and evaporation is minimized, but the composition complexity increases
Solution Approach 1:
The patent systematically varies the alkyl chain length parameter (from methyl to decyl radicals) to optimize the balance between viscosity reduction and composition complexity. By selecting specific carbon chain lengths and their proportions, the invention achieves improved flow properties without unnecessarily complicating the chemical composition, resolving the contradiction between operational ease and compositional simplicity.
Data Source
AI summary
A plasticizer composition contains a compound of the formula (1)and at least one dialkyl terephthalate, where the two alkyl groups in the dialkyl terephthalate each have 8 or 9 carbon atoms.