1、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.

2、Liquid Medium

A liquid medium-temperature latent curing agent for epoxy resins is a chemical substance capable of slowly releasing curing reactions under room temperature conditions.

3、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.

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).

Curing agents for epoxy resins

In order to convert epoxy resins to hard, infusible thermoset networks it is necessary to use crosslinking agents. These crosslinkers , hardeners or curing agents as they are widely known, promote cross-linking or curing of epoxy resins.

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.

Imidazolium Phosphinate Ionic Liquids as Latent Curing

Latent imidazolium phosphinate ionic liquids (IMPILs) with innovative structures were developed as high-performance curing agents for one-component epoxy systems.

Are ionic liquids effective curing agents for preparing epoxy adhesives

To this end, ten different imidazolium and phosphonium-based ionic liquids were tested as potential epoxy resin curing agents and the three best performers were selected for the study.

The epoxy resin system: function and role of curing agents

Curing agents are critical components of aqueous epoxy resin systems. Unfortunately, its uses and applications are restricted because of its low emulsifying yields. Epoxy resins are...

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.

In modern industrial and construction fields, the performance of materials and construction efficiency directly determine the success or failure of engineering projects. As a critical raw material in epoxy resin applications, liquid curing agents for medium-temperature curing play a pivotal role in determining the quality of final products. This article provides an in-depth analysis of liquid curing agents for medium-temperature epoxy curing, covering their definition, characteristics, application range, preparation methods, and influencing factors.

I. Definition of Liquid Curing Agents for Medium-Temperature Epoxy Curing

Liquid curing agents for medium-temperature epoxy curing are substances that promote the curing reaction of epoxy resins, typically in liquid form. They react with active components in epoxy resins to form stable resin network structures, thereby enhancing mechanical strength, chemical resistance, and thermal stability. These liquid curing agents can react at room temperature but require optimal conditions within a specific temperature range (e.g., 10–30°C) to achieve peak performance.

II. Characteristics of Liquid Curing Agents for Medium-Temperature Epoxy Curing

1. Reactivity: Highly reactive, capable of rapidly crosslinking with active components in epoxy resins to form robust network structures.
2. Adjustability: Different liquid curing agents have varying curing temperatures and times, allowing precise control over the curing process based on specific needs.
3. Compatibility: Compatible with multiple epoxy resin types, preventing delamination or separation in cured products.
4. Environmental Friendliness: Most are waterborne or low-toxicity, minimizing environmental and health impacts while enabling recycling.

III. Application Range of Liquid Curing Agents for Medium-Temperature Epoxy Curing

1. Construction: Widely used in concrete surface coatings, waterproof layers, tile adhesives, and sealing materials.
2. Automotive Manufacturing: Applied to automotive coatings, engine component bonding, and interior part fixation.
3. Electronics and Electricals: Used for PCB adhesion, encapsulation, protection, and insulation of electronic components.
4. Aerospace: Employed in aircraft fuselage bonding, engine component sealing, and composite material reinforcement.
5. Medical Devices: Utilized in dental materials, prosthetics, orthodontic devices, and medical adhesives.

IV. Preparation Methods for Liquid Curing Agents for Medium-Temperature Epoxy Curing

1. Raw Material Selection: Choose appropriate epoxy resins and liquid curing agents based on application requirements and performance needs.
2. Proportioning Design: Accurately mix curing agents and epoxy resins in specified ratios to ensure homogeneity and bubble-free formulations.
3. Mixing and Stirring: Thoroughly blend the mixed resin and curing agent within designated timeframes to achieve full integration.
4. Shaping Processing: Shape the liquid curing agent via methods like grouting, coating, or casting, depending on product specifications.
5. Curing and Conditioning: Cure the shaped material in a controlled environment until it reaches desired properties.

V. Factors Affecting the Performance of Liquid Curing Agents for Medium-Temperature Epoxy Curing

1. Curing Agent Type: Different curing agents have unique temperature and time requirements; selecting the right one is critical.
2. Environmental Conditions: Temperature and humidity significantly influence reaction rates and final performance.
3. Epoxy Resin Type: The choice of epoxy resin affects performance; compatibility with liquid curing agents must be optimized.
4. Additives: Catalysts, stabilizers, or other additives may be incorporated to enhance performance or meet specific application demands.
5. Storage Conditions: Liquid curing agents must be stored within specified temperature ranges to prevent degradation.

Liquid curing agents for medium-temperature epoxy curing are indispensable in industrial and construction applications, directly impacting product quality. With technological advancements and evolving market demands, optimizing preparation methods and expanding application scope will remain key priorities for future development.