Cyclohexane Ester Plasticizer Blend for Low-Volatility PVC Plastisols
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Solution Overview
Problem
Trimethyl esters of 1,2,4-cyclohexanetripropionic acid exhibit high viscosity and significant evaporation during processing when used alone as plasticizers in PVC-based plastisols, leading to suboptimal performance in final products.
Innovation Solution
A plasticizer composition comprising trimethyl esters of 1,2,4-cyclohexanetripropionic acid and 1,4-dialkylcyclohexanedicarboxylic acid esters with 8 or 9 carbon atoms, optionally with epoxidized oils or additional plasticizers, to improve application-related properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If trimethyl ester of 1,2,4-cyclohexanetripropionic acid is used as the sole plasticizer, then the gelling temperature is reduced, but the viscosity increases and evaporation occurs during processing
Solution Approach 1:
The patent combines trimethyl ester of 1,2,4-cyclohexanetripropionic acid with 1,4-dialkylcyclohexanedicarboxylic acid esters in a plasticizer composition. This merging of two different plasticizer compounds allows the composition to achieve low gelling temperature from the trimethyl ester while the 1,4-dialkylcyclohexanedicarboxylic acid ester compensates for the high viscosity and evaporation issues, resolving the technical contradiction.
2Productivity
If trimethyl ester of 1,2,4-cyclohexanetripropionic acid is used as the sole plasticizer, then rapid gelling is achieved, but significant portion evaporates during processing
Solution Approach 1:
The patent merges trimethyl ester of 1,2,4-cyclohexanetripropionic acid with 1,4-dialkylcyclohexanedicarboxylic acid esters to create a composite plasticizer system. The trimethyl ester provides rapid gelling action while the 1,4-dialkylcyclohexanedicarboxylic acid ester has lower volatility and compensates for evaporation losses, thus maintaining productivity while reducing substance loss.
3Temperature
If trimethyl ester of 1,2,4-cyclohexanetripropionic acid is used as the sole plasticizer, then low gelling temperature is achieved, but viscosity becomes too high for optimal processing
Solution Approach 1:
The patent combines trimethyl ester of 1,2,4-cyclohexanetripropionic acid with 1,4-dialkylcyclohexanedicarboxylic acid esters in specific ratios. The trimethyl ester contributes to low gelling temperature while the 1,4-dialkylcyclohexanedicarboxylic acid ester has different rheological properties that balance out the excessive viscosity, improving ease of operation and processability.
Data Source
AI summary
The present invention relates to a plasticizer composition comprising a compound of formula (1) and at least one 1,4-dialkylcyclohexanedicarboxylic acid ester, wherein the two alkyl groups in the 1,4-dialkylcyclohexanedicarboxylic acid ester each have 8 or 9 carbon atoms.