1、Novel Thermal Latent Curing Agents for Epoxy Resins Based on Dual
Herein, we present a dual-locked thermal latent curing agent based on aminopyridines, protected by amidation and N-oxidation, designed to enhance both pot life and final curing eficiency.
2、Facile synthesis of bio
Latent curing agents including dicyandiamide [6], hydrazides [7], imidazole derivatives [8] and microcapsules [9] have been developed and applied, among which imidazole derivatives are one of most studied ones.
3、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.
4、Epoxy Curing Agents – Latent Curing Agents for One Component Systems
Latent curing agents are clearly the choice for one component heat activated epoxy systems. Latency is achieved through either physical insolubility or lack of chemical reactivity at room temperature, and the reactivity, solubility, and latency all must be carefully balanced.
5、Common types of epoxy resin curing agent and its curing mechanism
This type of curing agent is basically a physical and chemical method to close the curing agent activity, these varieties are called latent curing agent, in fact, can be called functional latent curing agent.
Advanced Latent Curing Agents for Epoxy Resin Systems: Enhanced Control
Discover innovative latent curing agents for epoxy resins offering superior storage stability, precise curing control, and enhanced performance characteristics.
Latent curing epoxy systems with reduced curing temperature and
Especially, TCBPA and TBBPA, participated as the latent curing agents, were expected to enhance shelf life as well as reduce curing temperature of the single component epoxy adhesives due to the activation of chloride and/or bromine groups on phenol-based compounds.
Thioester
This study proposes an effective solution to extend the use of thiol-type curing agents, overcoming their short shelf life and presenting a more industry-friendly method.
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).
Types And Performance Of Epoxy Resin Curing Agent
According to the multiple classification method, the epoxy resin curing agent can be divided into: obvious curing agent and latent curing agent. Explicit curing agent is a commonly used curing agent, and can be divided into addition polymerization type and catalytic type.
In modern industrial and construction sectors, epoxy resins are widely utilized due to their excellent mechanical properties, chemical stability, and electrical insulation. The curing process of epoxy resins is a critical step in their application, and curing agents are indispensable in this process. Among these, latent high-temperature epoxy curing agents have attracted significant attention due to their unique performance characteristics.
Latent high-temperature epoxy curing agents are substances that can slowly release chemicals under specific conditions to promote resin curing. These agents typically exhibit a long latent period, allowing them to gradually release active ingredients without immediately triggering the curing reaction. This feature makes them particularly valuable in environments where precise control over curing time is essential.
Working Principle of Latent High-Temperature Epoxy Curing Agents
Most of these curing agents are based on organometallic compounds, such as aluminates or titanates. They are often encapsulated in microcapsules. When the temperature rises to a certain threshold, these microcapsules rupture, releasing the active ingredients inside. These ingredients then react with the epoxy resin, initiating the curing process.
Advantages of Latent High-Temperature Epoxy Curing Agents
- Controllability: Their latent nature allows for precise regulation of the curing process, avoiding issues related to premature or delayed curing. This is crucial for applications sensitive to curing time.
- Flexibility: Unlike traditional curing agents, latent ones are not restricted by curing temperatures, enabling their use across a wider temperature range and expanding their application fields.
- Environmental Adaptability: Some latent curing agents can function under extreme temperatures, making them suitable for harsh environments.
- Safety: Compared to fast-acting curing agents, latent variants typically contain fewer volatile organic compounds (VOCs), reducing harmful emissions and health risks during use.
Potential Drawbacks of Latent High-Temperature Epoxy Curing Agents
- Higher Cost: The complex manufacturing processes of latent curing agents result in higher costs compared to traditional options.
- Stringent Storage Conditions: To ensure effective release of active ingredients, these agents require specific storage conditions, such as avoidance of high temperatures and light.
- Limited Application Scope: While excellent for scenarios requiring precise curing control, their适用范围 remains narrow compared to broader-use curing agents.
Despite these challenges, the unique properties and advantages of latent high-temperature epoxy curing agents have driven their widespread adoption globally. With advancements in materials science and industrial technology, these agents are poised to play an increasingly vital role in high-performance material development. In the future, innovations in latent curing agents are expected to address evolving industrial demands and propel the frontiers of materials science.
