Glycol Ether Aryl Ester Plasticizers for Stable PVC Plastisol Viscosity
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Solution Overview
Problem
Existing plasticizers for PVC plastisols suffer from high volatility, leading to air quality and health concerns, increased viscosity over time, and inefficiencies in processing and fusion rates, while also contributing to volatile organic compound emissions.
Innovation Solution
Incorporation of glycol ether aryl esters as a second plasticizer in plastisols, formulated with general-purpose plasticizers, to achieve lower initial viscosity, improved stability, and enhanced processing efficiency, reducing volatile organic compound emissions and increasing fusion rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If general-purpose plasticizers are used to plasticize PVC, then plasticizing efficiency is achieved, but viscosity increases over time
Solution Approach 1:
The patent uses a composite plasticizer system combining a first plasticizer (e.g., phthalate or terephthalate ester) with a second plasticizer (glycol ether aryl ester). The first plasticizer provides initial plasticizing efficiency, while the second plasticizer stabilizes viscosity over time. This composite approach allows both plasticizing power and long-term viscosity stability to be achieved simultaneously, resolving the contradiction between immediate effectiveness and long-term stability.
2Ease of operation
If specialty plasticizers like alkyl monobenzoates are used to reduce viscosity, then viscosity control improves, but volatile organic compound emissions increase
Solution Approach 1:
The patent changes the chemical parameters of the plasticizer by using glycol ether aryl esters with specific molecular structures (containing ether oxygens and aromatic rings) that have lower volatility. This parameter change maintains the desired viscosity control properties while reducing vapor pressure and VOC emissions, thereby resolving the contradiction between operational ease and environmental harm.
3Productivity
If lower molecular weight plasticizers are used to improve fusion rates, then processing speed increases, but volatility and VOC emissions worsen
Solution Approach 1:
The patent employs a composite plasticizer system where the glycol ether aryl ester component provides fast fusion rates comparable to lower molecular weight plasticizers, but without the high volatility problem. The unique molecular structure (combining ether linkage, alkyl chain, and aromatic ester group) achieves this balance, resolving the contradiction between processing speed and volatility.
4Ease of operation
If more plasticizer is used to maintain low viscosity, then initial viscosity decreases, but cost and VOC emissions increase
Solution Approach 1:
The patent changes the chemical parameters of the plasticizer to use glycol ether aryl esters which have superior plasticizing efficiency per unit weight. This allows achieving the same low initial viscosity with lower overall plasticizer dosage, thereby reducing both cost and VOC emissions while maintaining the desired ease of operation.
Data Source
AI summary
Disclosed is the use of glycol ether aryl ester plasticizers as viscosity reducing agents in plastisols comprising di(2-ethylhexyl) terephthalate, 1,2-cyclohexane dicarboxylic acid diisononyl ester, or diisononyl phthalate as the primary plasticizer. The glycol ether aryl ester plasticizers improve viscosity and viscosity stability while maintaining or improving plastisol properties such as Shore A Hardness and fusion time.