Polyoxyalkylene Polyamide Epoxy Curing Agent for Recoatability
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Solution Overview
Problem
Conventional epoxy resin-based anti-corrosion coatings face issues with recoatability and weather resistance after long-term exposure, leading to poor intercoat adhesion and requiring abrasive treatments for recoating, which are technically and economically challenging.
Innovation Solution
A curing agent for epoxy resin is developed using a polyoxyalkylene polyamine component, combined with a glycidyl ether compound, which improves the recoatability and anticorrosive properties of the coating composition by reacting specific polyamine and carboxylic acid components, enhancing the coating's durability and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional epoxy resin-based anti-corrosion coatings are used, then good adhesiveness to substrates and basic anticorrosion properties are achieved, but weather resistance and recoatability after long-term exposure deteriorate
Solution Approach 1:
The patent uses a composite curing agent system combining polyoxyalkylene polyamine and carboxylic acid components to create a multi-functional coating formulation that simultaneously provides good adhesion, weather resistance, and recoatability after long-term exposure
Solution Approach 2:
The patent modifies the chemical composition parameters of the curing agent by incorporating specific ratios of polyoxyalkylene polyamine (20-80 mass%) and carboxylic acid components, which changes the coating's chemical structure to improve both durability and recoatability
2Reliability
If conventional epoxy resin coatings are recoated after long-term exposure, then multi-layer anti-corrosion protection is achieved, but intercoat adhesion becomes extremely low requiring abrasive treatments
Solution Approach 1:
The patent incorporates reactive functional groups in the curing agent formulation that maintain long-term chemical reactivity and surface activity, enabling direct overcoating without abrasive preparation by preliminarily preparing the surface for chemical bonding
Solution Approach 2:
The patent changes the chemical composition parameters of the curing agent to include polyoxyalkylene polyamine and carboxylic acid components in specific ratios, which modifies the coating's chemical structure to maintain long-term surface activity and enable direct recoating
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 new curing agent composition significantly enhances recoatability and anticorrosive properties, allowing for successful overcoating after long-term exposure without the need for abrasive treatments, thereby improving the efficiency and economy of the coating process.
Implementation Method 1
a curing agent for epoxy resin, which has been obtained by reacting a polyamine mixture (a) comprising 25-75 mol % of a polyoxyalkylene polyamine... with a carboxylic acid component (b)...
Implementation Method 2
addition of a glycidyl ether compound (c) to an amide-type reactant...
Data Source
AI summary
A curing agent for epoxy resin, and a coating composition using the curing agent curing agent that delivers excellent recoatability and overcoatability after a long time exposure.(A) An epoxy curing agent that is derived by adduction between amide-type reactants from polyamine compounds comprising from 25-75 mol % of a polyoxyalkylene-polyamine and carboxylic acids or a mixture thereof and glycidyl ether compound;(B) An epoxy curing agent of the mixture of (B1) amide-type reactants prepared through polyoxyalkylene-polyamine and carboxylic acids or a mixture thereof, and (B2) a reactant is derived by adduction between other aliphatic polyamines or a mixture thereof and glycidyl ether compound.Coating composition comprising the epoxy curing agent of the above described A or B.