Stable Plasticized Polyvinyl Halide Composition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Plasticized polyvinylhalides face issues with thermal, UV, and hydrolytic stability, leading to degradation and reduced product life, especially in applications where phthalate-based plasticizers are undesirable due to migration and health concerns.
Innovation Solution
A highly stable plasticized polyvinylhalide composition comprising polyvinylhalide, pentaerythritol tetravalerate, and an epoxidized unsaturated fatty acid ester with multiple epoxide groups, along with a PVC stabilizer, which enhances thermal, UV, and hydrolytic stability while avoiding phthalate-based plasticizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If phthalate-based plasticizers are used to achieve flexibility and processability, then the polymer becomes soft and processable, but the plasticizers migrate into food and affect consumer health
Solution Approach 1:
The invention extracts and eliminates phthalate-based plasticizers from the composition, replacing them with alternative plasticizers that do not migrate into food, thereby removing the harmful effect while maintaining the desired flexibility and processability
Solution Approach 2:
The invention changes the chemical parameters of the plasticizer by using alternatives with different molecular structures and properties that provide comparable flexibility without the migration issue, thus changing the plasticizer composition parameters to eliminate harm
2Ease of operation
If conventional plasticizers are used to provide flexibility, then the polymer becomes soft and flexible, but the composition exhibits poor thermal, UV, and hydrolytic stability
Solution Approach 1:
The invention uses a composite plasticizer system combining multiple alternative plasticizers (such as adipates, trimellitates, sebacates, and epoxidized oils) to achieve both flexibility and improved thermal, UV, and hydrolytic stability that single plasticizers cannot provide alone
Solution Approach 2:
The invention changes the chemical parameters of the plasticizer system by selecting alternatives with higher thermal stability, UV resistance, and hydrolytic stability parameters while maintaining the flexibility-providing properties
3Duration of action of stationary object
If the plasticized polymer is subjected to elevated temperatures over long time, then the polymer remains functional, but the plasticizer migrates and causes hydrolyzation leading to brittleness
Solution Approach 1:
The invention changes the thermal stability parameter of the plasticizer by using alternatives with higher boiling points and lower volatility that resist migration and hydrolyzation at elevated temperatures, thereby extending service life
4Duration of action of stationary object
If the plasticized polymer is exposed to UV light, then the polymer becomes yellowed and brittle, but the useful product life is reduced
Solution Approach 1:
The invention changes the UV stability parameter by selecting plasticizers with chemical structures that are resistant to UV degradation, preventing yellowing and brittleness formation, thereby maintaining useful product life in outdoor applications
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 exhibits improved stability, reduced volatility, and increased product life, with shorter fusion times and lower plasticizer migration, making it suitable for outdoor and high-temperature applications without the use of phthalates.
Implementation Method 1
Plasticisers have the ability to reduce the glass transition temperature of polymers and thereby provide soft and/or flexible products
Implementation Method 2
The thermal stability is particularly important in respect of processability of the plasticized polymer such as when agglomerating the polymer/plasticizer mixture but also when injection molding articles of said plasticized polymer
Implementation Method 3
The hot water may here cause migration of plasticizer. It may also cause hydrolyzation of the plasticizer itself
Implementation Method 4
Most plasticized polyvinylhalides have a poor stability towards UV light. This will be noticed by yellowing, the surface becoming sticky and slippery, the plasticized polymer becoming harder and more brittle
Data Source
AI summary
A highly stabile plasticized polyvinylhalide composition comprising polyvinylhalide, pentaerythritoltetravalerate and an epoxidized unsaturated fatty acid, the unsaturated fatty acid ester having an iodine value of at least 135 prior to epoxidation.