Vinyl Ester Resin Shelf Life Extension via Oxygen Mediation
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Solution Overview
Problem
Vinyl ester resin and unsaturated polyester resin are prone to self-polymerization and gelation due to ambient temperature and impurities, leading to reduced shelf life and increased costs when stored or transported, with conventional methods either reducing reactivity or being costly.
Innovation Solution
Enhancing the oxygen content of the resin by introducing an oxygen-containing gas or using chemical substances to produce oxygen, which reacts with free radicals to slow down or terminate self-polymerization reactions, thereby reducing gelation and extending shelf life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a free radical inhibitor is added to the vinyl ester resin or unsaturated polyester resin to minimize self-polymerization reaction, then the shelf life is extended, but the reactivity is reduced causing increased processing time or incomplete curing
Solution Approach 1:
The patent introduces oxygen as an intermediary substance that mediates between free radicals and polymer chains. Oxygen reacts with free radicals to form peroxyl radicals, which are less reactive and terminate the harmful chain reaction without permanently inhibiting the resin's curing capability. This resolves the contradiction by providing temporary protection during storage while preserving reactivity for later processing.
Solution Approach 2:
The patent changes the chemical parameter of the resin system by introducing oxygen, which alters the radical reaction pathway. The presence of oxygen transforms highly reactive free radicals into less reactive peroxyl radicals through a reversible reaction, extending shelf life without permanently reducing the resin's ability to cure when oxygen is removed or consumed during processing.
2Duration of action of stationary object
If a free radical inhibitor is added to minimize self-polymerization reaction, then the shelf life is extended, but the color of cured resin becomes darkened degrading appearance
Solution Approach 1:
Oxygen serves as a temporary intermediary that protects against self-polymerization during storage but does not permanently alter the resin system. Unlike conventional inhibitors that remain in the final product and cause darkening, oxygen is consumed or removed during processing, leaving no residual substance to affect the appearance of the cured resin.
3Duration of action of stationary object
If the vinyl ester resin or unsaturated polyester resin is stored in a freezer to reduce activation energy, then the shelf life is extended, but the cost increases
Solution Approach 1:
The resin system provides its own protection against self-polymerization through the oxygen interaction mechanism. The oxygen present in the system automatically reacts with free radicals to form peroxyl radicals, eliminating the need for external freezer storage or added chemical inhibitors. This self-protecting mechanism extends shelf life at ambient temperature without additional energy costs.
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 method effectively extends the shelf life of vinyl ester resin and unsaturated polyester resin without reducing reactivity or increasing costs, preventing gelation and maintaining product quality, while being more cost-effective than conventional methods.
Implementation Method 1
when the carbon-carbon unsaturated double bonds of the vinyl ester resin or the unsaturated polyester resin break to produce free radicals, the oxygen may react with the free radicals to generate stable peroxyl radicals
Implementation Method 2
the gas containing oxygen may be directly introduced into the vinyl ester resin or the unsaturated polyester resin through a syringe or a pump
Data Source
AI summary
Disclosed is a method for extending a shelf life of vinyl ester resin or unsaturated polyester resin during transportation or general storage. The method includes the step of enhancing an oxygen content of the vinyl ester resin or the unsaturated polyester resin, such that the self-polymerization reaction of reactive functional groups having carbon-carbon unsaturated double bonds of the vinyl ester resin or the unsaturated polyester resin can be minimized, so as to slow down occurrence of a gelation phenomenon of the vinyl ester resin or the unsaturated polyester resin in a long-time transportation or storage, and further to decrease a monetary loss.