Cyclic Epoxy Curing Agent for Hard Water-Resistant Coatings
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Solution Overview
Problem
Water-based paints tend to form coating films with lower hardness and water resistance compared to non-water-based paints, and existing technologies like PTL 1 have limitations in improving these properties.
Innovation Solution
An epoxy resin curing agent is developed through a reaction composition of polyalkylene glycol, a polyepoxy compound with a cyclic structure, and a polyamine with a cyclic structure, at specific mass and molar ratios, allowing for improved dispersibility and curability in water-based epoxy resin compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If water-based paint is used, then environmental safety and solvent regulation compliance are improved, but coating film hardness and water resistance deteriorate
Solution Approach 1:
The invention changes the chemical parameters of the curing agent by using a reaction product of polyalkylene glycol and polyepoxy compound with specific mass ratio (0.2-0.5), combined with polyamine having cyclic structure at molar ratio of 1/4 to 1/2. This parameter optimization resolves the contradiction by achieving both water-based formulation compliance and improved coating film hardness.
Solution Approach 2:
The curing agent is formulated as a composite material combining three components: polyalkylene glycol reaction product, cyclic polyepoxy compound, and cyclic polyamine. This composite structure enables the water-based paint to achieve coating film properties (hardness and water resistance) previously associated with solvent-based systems.
2Object-affected harmful factors
If water-based paint is used, then environmental safety and solvent regulation compliance are improved, but coating film water resistance deteriorates
Solution Approach 1:
The invention optimizes the mass ratio of polyalkylene glycol to total glycol and epoxy compound to be 0.2-0.5, and the molar ratio of reaction composition to polyamine to be 1/4 to 1/2. These parameter changes enable the water-based coating to achieve water resistance comparable to or exceeding traditional solvent-based coatings.
Solution Approach 2:
The polyalkylene glycol reaction product acts as an intermediary that bridges water solubility and water resistance. It provides water dispersibility for the paint formulation while the resulting crosslinked network structure delivers superior water resistance in the cured coating film.
3Ease of manufacture
If conventional curing agent composition is used, then ease of manufacture is improved, but coating film appearance and hardness deteriorate
Solution Approach 1:
The invention specifies precise parameter ranges: mass ratio of 0.2-0.5 and molar ratio of 1/4 to 1/2. These well-defined parameters enable consistent manufacturing with good reproducibility while achieving excellent coating film appearance and hardness, resolving the contradiction between ease of manufacture and manufacturing precision.
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 curing agent enables the formation of coating films with enhanced appearance, hardness, and water resistance in water-based epoxy resin compositions.
Implementation Method 1
a reaction composition containing a reaction product of a polyalkylene glycol (a1) and a polyepoxy compound having a cyclic structure (a2)
Implementation Method 2
a reaction composition containing a reaction product of component (a12) and component (a3), wherein component (a3) is a polyamine having a cyclic structure
Data Source
AI summary
An epoxy resin curing agent containing a reaction composition (A) containing a reaction product of the following component (a12) and component (a3): component (a12): a reaction composition containing a reaction product of a polyalkylene glycol (a1) and a polyepoxy compound having a cyclic structure (a2), and component (a3): a polyamine having a cyclic structure, wherein the mass ratio of the component (a1) to a total amount of the component (a1) and the component (a2), [(a1)/{(a1)+(a2)}], is from 0.28 to 0.50, and the reaction molar ratio between the component (a12) and the component (a3), [(a12)/(a3)], is from 1/4 to 1/2.