Epoxy Curing Agent for Wet Concrete Adhesion
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Solution Overview
Problem
Conventional wet surface coating materials for concrete structures, especially in corrosive environments like tunnels and hot springs, face issues with insufficient adhesion and water resistance, making them unsuitable for repair and maintenance.
Innovation Solution
A curing agent for epoxy resins is developed, combining aromatic amines and specific aliphatic amines with a curing accelerator, which allows for room temperature curing and excellent adhesion to wet surfaces, even in acidic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional wet surface coating materials are used, then application to wet surfaces is possible, but adhesion to the surface is insufficient
Solution Approach 1:
The invention changes the chemical parameters of the curing agent by using a specific combination of aromatic amine and aliphatic amine with controlled molecular weights and structures. This chemical parameter change enables the coating to achieve both wet surface applicability and strong adhesion, resolving the contradiction between application capability and bonding strength.
Solution Approach 2:
The invention employs a composite curing agent system combining aromatic amine (providing water resistance) and aliphatic amine (providing adhesion and curing performance). This composite approach allows the coating to simultaneously achieve wet surface application capability and reliable adhesion to concrete substrates.
2Reliability
If aromatic amine is used as curing agent, then water resistance is improved, but room temperature curing performance deteriorates
Solution Approach 1:
The invention merges aromatic amine and aliphatic amine into a single curing agent formulation. The aromatic amine component provides water resistance, while the aliphatic amine component enables room temperature curing. The combination allows both functions to work together synergistically, resolving the contradiction between water resistance and curing operability.
3Ease of operation
If aliphatic amine is used as curing agent, then room temperature curing is enabled, but water resistance deteriorates
Solution Approach 1:
The invention combines aliphatic amine (providing room temperature curing capability) with aromatic amine (providing water resistance). This merging of functions allows the curing agent to achieve both ease of operation at room temperature and reliability in terms of water resistance, resolving the contradiction between curing operability and water resistance.
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 epoxy resin composition provides a strong, water-resistant coating film that can be applied to wet surfaces without prior drying, enhancing the durability and adhesion to concrete substrates, suitable for use as a primer, repair material, or jointing agent in challenging environments.
Implementation Method 1
a curing agent for epoxy resins, which is characterized by containing (a1) an aromatic amine, (a2) an aliphatic amine having an aromatic ring or a cycloalkane ring, and (a3) a curing accelerator
Implementation Method 2
the epoxy resin can be reacted with a curing agent comprising an aromatic amine and a specific aliphatic amine in combination
Implementation Method 3
a curing accelerator, and an epoxy resin composition containing a combination of the curing agent and an epoxy resin
Data Source
AI summary
Provided are a curing agent for epoxy resins, which is a curing agent capable of curing an epoxy resin at room temperature, and which can form a cured product (cured coating film) having excellent adhesion even to a substrate which is not in an environment completely dried, and an epoxy resin composition obtained using the same. A curing agent for epoxy resins, containing (a1) an aromatic amine, (a2) an aliphatic amine having an aromatic ring or a cycloalkane ring, and (a3) a curing accelerator, and an epoxy resin composition containing the curing agent and an epoxy resin.