Phthalate-Free Plasticizer Composition for PVC Wire Insulation
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Solution Overview
Problem
Phthalate-based plasticizers in PVC products face scrutiny due to environmental and health concerns, and existing phthalate-free alternatives like epoxidized soy oil have limited solubility and cause 'spew' leading to brittleness and failure at low temperatures.
Innovation Solution
A phthalate-free plasticizer composition comprising epoxidized fatty acid methyl ester, epoxidized natural oil, and epoxidized tallate ester, which improves solubility and weight retention in PVC, preventing spew and passing low temperature unwind tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If epoxidized soy oil is used as a phthalate-free plasticizer, then the environmental and health safety is improved, but the solubility in PVC is limited and spew occurs leading to brittleness at low temperature
Solution Approach 1:
The patent uses a composite plasticizer system combining epoxidized soy oil with other compatible plasticizers and processing aids to achieve both phthalate-free formulation and adequate low-temperature flexibility. This composite approach allows the benefits of epoxidized soy oil while compensating for its limitations through synergistic combinations with other materials.
Solution Approach 2:
The patent modifies the chemical parameters of the plasticizer system by using epoxidized soy oil with specific epoxy content and molecular weight characteristics. This parameter optimization improves solubility in PVC and reduces spew while maintaining the phthalate-free advantage and low-temperature performance.
2Loss of substance
If epoxidized soy oil is used as a plasticizer, then the phthalate content is reduced, but the spew phenomenon occurs causing surface migration and rigidity increase
Solution Approach 1:
The patent introduces processing aids and compatibility modifiers as intermediary substances that facilitate uniform distribution of epoxidized soy oil in the PVC matrix. These intermediaries prevent phase separation and spew by improving the interfacial compatibility between the plasticizer and polymer, thereby stabilizing the composition while maintaining reduced phthalate content.
Solution Approach 2:
The patent optimizes molecular parameters of the plasticizer system, including epoxy group density and average molecular weight, to enhance compatibility with PVC. These parameter adjustments reduce the tendency for spew and improve compositional stability while preserving the phthalate-free advantage.
3Ease of operation
If conventional phthalate plasticizers are used, then the flexibility and processability are improved, but the environmental and health risks increase
Solution Approach 1:
The patent selects epoxidized soy oil with optimized epoxy content and molecular characteristics to replace phthalates. This parameter optimization ensures that the alternative plasticizer maintains adequate processability and flexibility while eliminating the harmful phthalate components, thus resolving the contradiction between ease of operation and environmental safety.
Solution Approach 2:
The patent develops a composite plasticizer formulation that combines epoxidized soy oil with other environmentally safe plasticizers and processing aids. This composite system replicates the processability benefits of conventional phthalates while eliminating their harmful effects, achieving both ease of operation and reduced environmental impact.
Data Source
AI summary
The present disclosure is directed to a plasticizer, polymeric compositions containing the plasticizer, and conductors coated with the polymeric composition. The plasticizer includes (i) an epoxidized fatty acid methyl ester, (ii) an epoxidized natural oil, and (iii) an epoxidized tallate ester. Polymeric compositions containing a polymeric resin and the plasticizer exhibit a weight loss less than 50 mg/cm2 after exposure to 100° C. for seven days. Conductors coated with the polymeric composition (containing the plasticizer) pass the low temperature unwind test of UL719 and exhibit a weight loss less than 50 mg/cm2 after exposure to 100° C. for seven days.