1、Curing reactions of epoxy powder coatings in perspectives of chemical
The properties of the cured products of epoxy powder coatings are dominated by the curing systems. This review discusses the types, reaction principles, characteristics of curing agents and accelerators that participate in the curing reaction with different epoxy resins.
2、A review of the curing rate and mechanical properties of epoxy resin on
In epoxy resin composite, the curing rate of epoxy resin determines the production efficiency, cost, and applications. The majority of the composite preparation cycle is dedicated to the curing reaction of the epoxy resin matrix.
3、Theoretical studies of mechanisms of epoxy curing systems
epoxy resin, a particular curing agent and/or a particular catalyst. The examination of all possible reaction pathways for each curing system can allow us to predict the most preferable pathway in the system and can enable the development of a more accurate kinetic model for the system.
Curing Agent: Types & Process of Curing Agents for Epoxy Resin
Explore the main types of curing agents & various crosslinking methods which help to improve the polymerization process to select the right curing agent for coating formulation.
Mechanism of Epoxy Resin Curing by Curing Agents
We reveal a novel stepwise curing mechanism of epoxy resin using the present dual-locked 4MApy, unlike conventional thermal latent curing agents, as evidenced by 1 H NMR, MALDI-TOF MS, and DSC analyses.
Influence of different composite curing agents on the rapid curing
In particular, effective formulations are designed for mixing fast and slow curing agents, studying their effects on the curing behavior, curing quality, and mechanical properties of epoxy resins and elucidating their influence mechanisms.
A critical review of dynamic bonds containing curing agents for epoxy
Investigated the mechanical, thermomechanical, thermal, and recycling properties of the epoxy thermosets cured by developed curing agents. Addressed the challenges, opportunities and emerging trends in the field.
Common types of epoxy resin curing agent and its curing mechanism
Common types of epoxy resin curing agent and its curing mechanism This article briefly summarizes the common types of epoxy resin curing agent and its curing mechanism.
Mechanism and Applications of Epoxy Curing Agents
Epoxy curing agents are specialized chemicals that facilitate the curing reaction of epoxy resins, enhancing their mechanical properties and chemical stability. This article focuses on the working mechanism and applications of epoxy curing agents.
Effect of Curing Agent Type on Curing Reaction Kinetics of Epoxy Resin
In this paper, low molecular weight polyamides, aromatic amines and anhydrides were selected as three kinds of curing agents and their isothermal viscosity-time properties were studied to...
Epoxy resin is a high-molecular-weight polymer formed by the reaction of organic compounds with polyisocyanates. It is widely used in electronics, construction, automotive manufacturing, and other fields due to its excellent mechanical properties, electrical insulating properties, and chemical stability. The curing agent plays a critical role in the curing process of epoxy resin, and its curing mechanism is a key step in achieving the final performance of the material.
The curing process of epoxy resin is a complex chemical reaction involving multiple stages. In the initial stage, monomers (such as epoxy groups) in the epoxy resin are gradually converted into a three-dimensional crosslinked network structure under the catalytic action of the curing agent. This transformation typically involves chain growth and branching, forming a continuous network. As the reaction between the curing agent and the resin progresses, the network structure densifies, resulting in higher strength and hardness, while reducing water absorption and expansion rates.
The selection of curing agents significantly impacts the performance of epoxy resin. Common curing agents include amine-based, anhydride-based, and imidazoline-based categories, each promoting curing through distinct mechanisms:
- Amine Curing Agents: These provide active hydrogen atoms that react with epoxy groups via addition reactions, forming stable cyclic compounds. Amine curing agents are highly reactive and rapidly initiate curing but may cause discoloration in the resin.
- Anhydride Curing Agents: These react with epoxy groups through acylation reactions, forming stable ester bonds. Though less active than amines, they offer more uniform curing outcomes.
- Imidazoline Curing Agents: These utilize nitrogen atoms in the imidazoline ring to react with epoxy groups, forming stable imidazoline rings. They exhibit good thermal stability and chemical resistance but often require higher temperatures for complete curing.
Beyond curing agent types, curing conditions (e.g., temperature, humidity, light) also critically affect the process and final performance. Optimal conditions accelerate reaction rates and efficiency while avoiding incomplete curing or performance degradation due to environmental factors. For instance, high temperatures enhance curing agent reactivity, facilitating rapid curing, whereas high humidity may inhibit reactions.
To achieve optimal results, curing agent selection, conditions, and application environments must be holistically considered. Precise control of these parameters ensures epoxy resin performs at its best in practical applications.
The curing of epoxy resin is a multi-stage, variable-dependent process spanning chemical reaction kinetics, materials science, and engineering. A deep understanding of its mechanisms guides practical applications, meeting diverse performance demands. In the future, innovations in epoxy resin curing technologies will continue advancing materials science, contributing to societal progress.
