1、Liquid phosphorus

Herein, two liquid phosphorus-containing bis-imidazole compounds, PPDM and DPCMI, were synthesized as latent curing agents for EP, demonstrating multiple effects in improving latency, thermal stability, mechanical properties, and fire safety.

2、Preparation of Imidazole Compounds as Latent Curing Agents and Their

For an epoxy resin system, curing agents significantly influence the cured epoxy properties. Generally, epoxy monomers can be cured with anhydrides, amines, imidazole, polyamides, onium salts, and carboxylic acid [12].

3、Imidazolium Phosphinate Ionic Liquids as Latent Curing Agents for Epoxy

This work establishes IMPILs as a novel class of liquid latent curing agents that satisfy both long-term storage requirements and excellent thermal-curing performance for advanced epoxy composites.

4、Imidazole Curing Agents

Evonik imidazoles provide a broad range of latency. Reaction with imidazoles is rapid beyond activation temperatures and, unlike with other Lewis-Base catalysts, the degree of cure can be driven further with higher postbake temperatures.

5、Imidazole

Imidazole-based curing agents are highly efficient latent hardeners for epoxy resins. They belong to the imidazole family — five-member heterocyclic compounds containing two nitrogen atoms, known for strong basicity, nucleophilicity, and coordination ability.

Bis

Abstract One-component epoxy resins (OCERs) are widely used for simplified processing, prolonged stability, and enhanced performance. This study synthesizes a novel bis-imidazole latent curing agen...

A Modified Imidazole as a Novel Latent Curing Agent with Toughening

Based on this principle, many kinds of latent curing agents have been developed, such as imidazole derivatives, 7-9 dicyandiamide, and others.

Dynamic imidazole

While conventional latent curing systems have partially mitigated this issue, they still struggle with excessive brittleness. To overcome these limitations, we develop an imidazole-based latent curing agent that is synergistically blocked using dynamic covalent bonds and metal coordination.

A multifunctional P/Si

Herein, a phosphorus/silicon-derived, imidazole-based oligomer (DM) was synthesized and applied as a latent curing agent for EP. DM exhibits great storage stability and fast curing rate.

Thermal curing of epoxy resins at lower temperature using 4

In this study, we present N -methyl- N -pyridyl amide derivatives as thermal latent curing agents for use at lower temperatures, along with their mechanism of epoxy curing through the generation of the highly reactive 4- (methylamino)pyridine (4MAPy) (Figure 1).

In modern industry, epoxy resins are widely utilized across various fields due to their exceptional physical and chemical properties. Among these, epoxy latent curing agents based on imine compounds represent a specialized class of resin materials. They exhibit unique performance characteristics during the curing process, offering expanded possibilities for epoxy resin applications. This article provides an in-depth exploration of the properties, applications, and future development trends of imine-based epoxy latent curing agents.

1. Physical and Chemical Properties of Epoxy Latent Curing Agents Based on Imine Compounds

Imine-based epoxy latent curing agents are compounds with distinctive structures, typically composed of epoxy resin, amine compounds, and catalysts. These substances remain in a liquid or semi-solid state under normal conditions but undergo curing reactions under specific triggers (e.g., heating, light exposure, or chemical reactions), forming hardened, stable three-dimensional structures. Although the curing process may require extended time, the final material demonstrates significantly enhanced performance.

2. Curing Mechanism of Epoxy Latent Curing Agents Based on Imine Compounds

The curing mechanism of imine-based epoxy latent curing agents relies primarily on inter molecular cross-linking reactions. During curing, functional groups within the molecular chains bond to form new chemical links, transitioning the material from a liquid to a solid state. This process often involves volume shrinkage, but the resulting material exhibits high mechanical strength and chemical resistance.

3. Applications of Epoxy Latent Curing Agents Based on Imine Compounds

Owing to their superior properties, imine-based epoxy latent curing agents are extensively employed in diverse sectors. In construction, they serve as concrete additives, waterproof materials, and adhesives; in electronics, they function as encapsulants, circuit board binders, and insulating materials; and in aerospace, they are used to manufacture high-performance composites and structural components. Additionally, their excellent wear and corrosion resistance has led to widespread adoption in oil extraction, chemical production, and nuclear industries.

4. Development Trends of Epoxy Latent Curing Agents Based on Imine Compounds

As technology advances and industrial demands evolve, research and application of imine-based epoxy latent curing agents continue to progress. On one hand, researchers are developing novel compounds to enhance performance and reduce costs; on the other, engineers are exploring ways to optimize material properties by refining formulations and process parameters, such as controlling curing time and temperature. integrating nanotechnology and bio-based materials is expected to further improve environmental sustainability and functionality.

As a critical class of chemical materials, imine-based epoxy latent curing agents hold vast potential for industrial applications. Through ongoing innovation and research, the development of high-performance, eco-friendly variants will undoubtedly contribute even more to the advancement of human society.