Antioxidant Mixture Composition for Precipitation-Free Metal Storage
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Solution Overview
Problem
The challenge of maintaining a masked phenolic antioxidant in a solution state without precipitation when stored in metal containers for long periods in large-scale polymer production facilities, leading to issues like container attachment and piping clogging.
Innovation Solution
A method of storing an antioxidant mixture containing an aluminum compound represented by specific formulas, optionally with a hydrocarbon solvent, to prevent precipitation and maintain the antioxidant in a solution state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If masked phenolic antioxidant is stored in metal containers for long periods, then the antioxidant can be retained in large-scale polymer production facilities, but precipitation occurs causing container attachment and piping clogging
Solution Approach 1:
The patent changes the chemical parameters of the antioxidant mixture by specifying precise compositional ratios (antioxidant 0.1-10 wt%, aluminum compound 90-99.9 wt%) and molecular structure requirements (aluminum compound with formula AlR3 where R is alkyl group with 3-20 carbon atoms). These parameter changes prevent precipitation during long-term storage in metal containers while maintaining solution stability.
Solution Approach 2:
The patent creates a composite antioxidant mixture system combining antioxidant compounds with specific aluminum compounds in defined ratios. This composite formulation prevents precipitation and maintains stability during long-term storage, resolving the contradiction between storage duration and precipitation prevention.
2Quantity of substance
If masked phenolic antioxidant is stored in metal containers, then large-scale polymer production can be supported, but processing problems occur due to attachment and clogging
Solution Approach 1:
The patent optimizes the concentration parameters of the antioxidant mixture (antioxidant 0.1-10 wt%, aluminum compound 90-99.9 wt%) to prevent precipitation and maintain processing smoothness. This allows adequate antioxidant quantity for large-scale production without causing attachment or clogging issues.
Solution Approach 2:
The aluminum compound acts as an intermediary substance that masks the phenolic antioxidant, preventing direct interaction with metal container surfaces. This intermediary role eliminates processing problems while maintaining the antioxidant's functionality in large-scale production.
3Reliability
If conventional aluminum compounds are used with phenolic antioxidants, then antioxidant function is achieved, but precipitation occurs during storage
Solution Approach 1:
The patent changes the chemical parameters by specifying aluminum compounds with formula AlR3 where R is an alkyl group with 3-20 carbon atoms (e.g., triisobutylaluminum, tricyclohexylaluminum). This specific parameter selection maintains antioxidant function while preventing precipitation, thereby improving solution stability during storage.
Solution Approach 2:
The patent applies local quality by selecting aluminum compounds with specific molecular characteristics (branched or cyclic alkyl groups) that provide steric hindrance. This local structural feature prevents precipitation while maintaining the antioxidant's protective function, resolving the contradiction between reliability and stability.
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 prevents precipitation of the masked phenolic antioxidant during long-term storage, ensuring smooth processing and preventing container attachment and piping clogging.
Implementation Method 1
a phenolic antioxidant masked by triethylaluminum is added to a catalyst system or a polymerization system
Data Source
AI summary
A method of storing an antioxidant mixture includes storing an antioxidant mixture containing an antioxidant and an aluminum compound represented by the following formula (3): AlR3 (3) wherein R moieties each independently represent a halogen atom or an alkyl group having 3 or more carbon atoms.