Oxygen-Absorbing Resin Composition for Delayed Post-Irradiation Scavenging
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Solution Overview
Problem
Existing oxygen scavenger using oxygen-absorbing resin initiates oxygen absorption immediately after energy ray irradiation, leading to deactivation before enclosure with stored objects, especially in industrial applications where assembly times are long.
Innovation Solution
An oxygen-absorbing resin composition containing an easily-oxidizable thermoplastic resin and a manganese fatty acid salt catalyst, with specific carbon atom ranges and content ratios, to maintain oxygen absorption performance after exposure to energy rays and atmospheric holding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an oxygen-absorbing resin is used as an oxygen scavenger, then it is easier to handle and has high flexibility in shape, but it initiates oxygen absorption immediately after irradiation with energy rays, leading to deactivation before enclosing with stored objects
Solution Approach 1:
The patent changes the chemical parameters of the resin composition by incorporating specific metal catalysts (manganese, iron, cobalt, nickel, copper, or zinc) at controlled concentrations (0.01-10 parts by mass per 100 parts by mass of resin). This parameter modification alters the oxidation initiation characteristics, enabling the resin to maintain stability after energy ray irradiation and only absorb oxygen when triggered by contact with stored objects, thus resolving the contradiction between ease of handling and reliability.
2Reliability
If the oxygen scavenger is irradiated with energy rays to initiate oxygen absorption, then oxygen absorption performance is activated, but the scavenger becomes deactivated after being held in the atmosphere for a certain period of time
Solution Approach 1:
The patent applies preliminary action by pre-incorporating metal catalysts into the resin composition before use. These catalysts remain dormant during storage and after energy ray irradiation, but become activated only when the resin comes into contact with stored objects. This preliminary preparation ensures the resin maintains its oxygen absorption capability throughout the entire service period, resolving the contradiction between activation reliability and service life duration.
3Ease of manufacture
If a long time is required to enclose the oxygen scavenger together with an industrial product, then assembly work can be completed thoroughly, but the oxygen scavenger deactivates before enclosure
Solution Approach 1:
The patent implements beforehand cushioning by designing a resin composition with metal catalysts that provide a time buffer. The resin can withstand prolonged exposure to atmosphere during assembly operations without deactivating, as the catalysts remain stable until triggered by contact with the stored object. This cushioning effect allows sufficient time for thorough assembly work while preventing premature deactivation, resolving the contradiction between manufacturing ease and time loss.
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 resin composition sustains sufficient oxygen absorption performance even after being held in the atmosphere for up to 3 days post-irradiation, suitable for industrial applications with prolonged assembly times.
Implementation Method 1
an easily-oxidizable thermoplastic resin... exhibits oxygen-absorbing ability upon energy ray irradiation
Implementation Method 2
a metal catalyst, the oxygen-absorbing resin composition exhibits oxygen-absorbing ability upon energy ray irradiation, in which the metal catalyst is a fatty acid salt of manganese
Data Source
AI summary
Provided herein is an oxygen-absorbing resin composition containing an easily-oxidizable thermoplastic resin and a metal catalyst, in which the oxygen-absorbing resin composition exhibits oxygen-absorbing ability upon energy ray irradiation, and the metal catalyst is a fatty acid salt of manganese.