Plasticized PVC Composition to Reduce Plasticizer Leaching
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Solution Overview
Problem
PVC is hard and brittle, and common plasticizers like DEHP leach from PVC articles, raising health concerns due to potential adverse effects in humans.
Innovation Solution
A blended composition of PVC with specific amounts of plasticizers and surface modifying macromolecules (SMMs) reduces plasticizer leaching, maintaining flexibility and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional PVC compounds are used, then basic structural integrity is maintained, but surface quality deteriorates due to poor adhesion and rough texture
Solution Approach 1:
The patent modifies the chemical composition parameters of the PVC compound by incorporating surface-modifying macromolecules (silanes, epoxies, polyesters) at specific concentrations (0.1-5 parts per 100 parts PVC). This changes the surface chemistry parameters to improve adhesion while maintaining bulk structural integrity, resolving the contradiction between surface quality and adhesion reliability.
Solution Approach 2:
The patent creates a composite material system combining PVC base resin with surface-modifying macromolecules (silanes, epoxies, polyesters) and lubricants. This composite structure provides both the structural integrity of PVC and the surface adhesion properties of the modifying agents, simultaneously achieving both requirements.
2Ease of manufacture
If plasticizers are added to improve flexibility, then processability is enhanced, but surface quality deteriorates due to blooming and roughness
Solution Approach 1:
The patent introduces surface-modifying macromolecules (silanes, epoxies, polyesters) as intermediary substances between the plasticizer and the PVC matrix. These intermediaries prevent plasticizer migration to the surface (blooming) while maintaining the plasticizer's flexibility-enhancing function, thus improving processability without sacrificing surface smoothness.
Solution Approach 2:
The patent adjusts the chemical composition parameters by selecting specific plasticizers with appropriate molecular weights and structures, and combining them with surface-modifying agents. This modifies the interaction parameters between plasticizer and PVC matrix to prevent phase separation and surface blooming, maintaining surface quality while enabling flexible processing.
3Quantity of substance
If standard PVC formulations are used, then material cost is minimized, but surface adhesion to substrates is insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating surface-modifying macromolecules (silanes, epoxies, polyesters) at optimized concentrations (0.1-5 parts per 100 parts PVC). This achieves adequate substrate adhesion while minimizing the quantity and cost of expensive adhesion promoters, balancing material cost with adhesion reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition achieves reduced plasticizer leaching, ensuring the articles maintain flexibility and transparency while minimizing health risks.
Implementation Method 1
comprising from 0.1 to 5 parts by weight, based on 100 parts by weight of PVC, of surface-modifying macromolecules having a weight average molecular weight of from 1,000 to 1,000,000
Implementation Method 2
comprising from 0.1 to 5 parts by weight, based on 100 parts by weight of PVC, of a lubricant
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
The present invention relates to polyvinvyl chloride (PVC) admixtures with plasticizers and surface modifying macromolecules. In accordance with embodiments, articles formed from the compositions disclosed herein may reduce leaching of plasticizers.