Bio-based Plasticizer Composition for PVC Compatibility
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Solution Overview
Problem
Existing plasticizers derived from natural sources, such as epoxidized fatty acid alkyl esters, face challenges including high levels of saturated fatty acid residues and monoacylglycerides, which lead to exudation, VOC release, and crystallization in PVC products, limiting their compatibility and performance.
Innovation Solution
The development of a plasticizer composition with an epoxidized fatty acid C1-C6 alkyl ester component, characterized by less than 6% saturated fatty acid residues and less than 2% monoacylglycerols, which improves compatibility and reduces exudation and VOC release, thereby enhancing the performance and stability of PVC products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If epoxidized fatty acid alkyl esters are used as plasticizers, then they provide a bio-based alternative to phthalates, but high levels of saturated fatty acid residues and monoacylglycerides cause exudation, VOC release, and crystallization in PVC products
Solution Approach 1:
The patent applies parameter changes by strictly controlling the saturated fatty acid content to less than 6% and monoacylglyceride content to less than 2% in the epoxidized fatty acid alkyl ester plasticizer. This quantitative parameter control resolves the contradiction by eliminating the harmful components (saturated fatty acids and monoacylglycerides) that cause exudation and VOC release, while preserving the beneficial bio-based nature of the plasticizer.
2Ease of manufacture
If epoxidized fatty acid alkyl esters with high saturated fatty acid content are used, then they are easier to produce from natural sources, but they exhibit poor compatibility with PVC and cause crystallization
Solution Approach 1:
The patent resolves this contradiction by changing the compositional parameters of the plasticizer to contain less than 6% saturated fatty acid residues. This parameter change maintains ease of manufacture from natural sources while dramatically improving compatibility with PVC and eliminating crystallization issues that occur with higher saturated fatty acid content.
3Adaptability or versatility
If plasticizers are used to improve flexibility and processability of PVC, then they enable wide range of applications, but phthalate plasticizers have adverse endocrine-related effects and are restricted by regulatory agencies
Solution Approach 1:
The patent applies this principle by replacing the harmful but effective phthalate plasticizers with bio-based epoxidized fatty acid alkyl esters. Although bio-based plasticizers were previously considered to have performance limitations, the patent demonstrates that with proper compositional control (less than 6% saturated fatty acids and less than 2% monoacylglycerides), they can achieve comparable performance without the endocrine-disrupting effects, thus enabling continued wide application range without regulatory restrictions.
4Reliability
If secondary plasticizers like ESO are used to improve thermal stability, then they complement material performance, but they have limited compatibility with PVC and act only as co-additives
Solution Approach 1:
The patent resolves this contradiction by changing the compositional parameters to less than 6% saturated fatty acid residues and less than 2% monoacylglycerides. This enables the plasticizer to achieve both improved thermal stability (like ESO) and significantly improved compatibility with PVC, allowing it to function as a primary plasticizer rather than just a secondary co-additive.
Data Source
AI summary
The disclosure relates to a plasticizer composition comprising an epoxidized fatty acid C1-C6 alkyl ester component wherein the epoxidized fatty acid C1-C6 alkyl ester component contains (i) less than 6% saturated fatty acid residues and (ii) less than 2% monoacylglycerols. The disclosure further relates to a plasticized polymer composition, comprising (a) 100 parts by weight of at least one polymer resin; and (b) about 10 to 150 parts by weight of a plasticizer compounded with the at least one polymer resin, wherein the plasticizer comprises an epoxidized fatty acid C1-C6 alkyl ester component wherein the epoxidized fatty acid C1-C6 alkyl ester component contains (i) less than 7% saturated fatty acid residues and (ii) less than 2% monoacylglycerols.