Alkylated Amine Epoxy Curing Agent Storage Stability
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Solution Overview
Problem
Amine compounds like meta-xylylenediamine are highly reactive, leading to storage stability issues due to carbonation when exposed to air, and have poor handleability due to low melting points, complicating their use as epoxy curing agents.
Innovation Solution
A method involving an addition reaction of ethylene and/or propylene with specific amine compounds in the presence of a base, using a base composition containing alkali metal compounds, to produce compounds with improved storage stability and handleability, suitable for use as epoxy curing agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If amine compounds are stored in air atmosphere, then handling is simple, but storage stability deteriorates due to carbonation
Solution Approach 1:
The patent applies inert atmosphere by conducting the addition reaction in a nitrogen or argon atmosphere to prevent carbonation of the amine compound during storage and reaction, thereby maintaining storage stability while enabling simple handling without requiring complex protective measures
2Reliability
If amine compounds with low melting point are used, then reactivity is high, but handleability deteriorates due to crystallization at low temperatures
Solution Approach 1:
The patent changes the physical parameters by conducting the reaction at controlled temperatures (0-10°C during ethylene filling, then raising to 20-40°C for reaction) and using specific pressure conditions (1.5-2.3 MPa ethylene filling pressure) to maintain the amine compound in a manageable state while preserving its high reactivity
3Ease of operation
If additives are added to improve handleability, then handleability improves, but reaction purity deteriorates due to side reactants
Solution Approach 1:
The patent extracts and eliminates the need for additives by utilizing the amine compound itself and controlled reaction conditions (temperature and pressure parameters) to achieve both improved handleability and high reaction purity, removing harmful substances from the system
4Reliability
If compounds reacting with carbon dioxide are used to improve storage stability, then storage stability improves, but reaction efficiency deteriorates due to reaction inhibition
Solution Approach 1:
The patent uses inert atmosphere (nitrogen or argon) to create a protective environment that prevents carbonation during storage while not interfering with the intended addition reaction, thereby maintaining both storage stability and reaction efficiency without using compounds that would inhibit the reaction
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 produced compounds exhibit enhanced storage stability and handleability, allowing for their use as raw materials and intermediates in pharmaceuticals and agricultural chemicals, and as effective epoxy curing agents without the need for inert gas atmospheres or additives.
Implementation Method 1
subjecting a compound represented by Formula (5-1) to an addition reaction to add ethylene and/or propylene in the presence of a base
Data Source
AI summary
Provided are: a method for producing a compound that excels in storage stability and handleability; the compound; and an epoxy curing agent containing the compound. The method for producing a compound represented by Formula (1-1) includes subjecting the compound represented by Formula (5-1) to an addition reaction to add ethylene and/or propylene in the presence of a base. In Formula (5-1), RX to RZ each independently represent a hydrogen atom, an ethyl group, an n-propyl group, or an isopropyl group, and n is an integer of from 1 to 3. In Formula (1-1), RA to RD each independently represent a hydrogen atom, an ethyl group, an n-propyl group, or an isopropyl group, and n is an integer of from 1 to 3.