1、Preparation of fully epoxy resin microcapsules and their application in

Herein, an innovative self-healing epoxy coating with outstanding corrosion resistance has been developed. The self-healing capability of the coating is achieved by embedding microcapsules, comprising of solidified epoxy resin as the outer layer and liquid epoxy resin as the inner content.

2、Nanoclay

In this study, nanoclay particles were used as a promising approach to prevent the flow out of core materials from the microcapsules’ shell.

3、Preparation of Latent Curing Agent for Epoxy Resin by Encapsulation

Abstract. The microcapsule-type curing agents DDM-PMMA and IZ-PU were prepared by solvent evaporation method and interfacial polymerization method, respectively. The surface morphology of the two microcapsules was characterized by SEM.

4、Preparation of Microcapsules Containing a Curing Agent for Epoxy Resin

To prepare cured epoxy resin particles encapsulating a curing agent (diamine), the self-assembly of phase-separated polymer (SaPSeP) method was developed to be applicable to polyaddition reaction of a stoichiometrically imbalanced system.

5、Preparation and characterization of a novel

In this study, a novel microcapsule-type latent curing agent has been obtained by encapsulating butyl glycidyl ether modified 2-ethyl-4-methyl imidazole (BGE-M-2E4MZ) with polyetherimide (PEI) as the shell material through a simple emulsion/solvent evaporation method.

Journal of Applied Polymer Science

A microcapsule-type latent curing agent is prepared by solvent evaporation method with diaminodiphenylmethane (DDM) as the core material and PMMA as the wall material.

(PDF) Preparation of Latent Curing Agent for Epoxy Resin by

Two encapsulation methods were compared in terms of hydrophilicity or lipophilicity of the core material, formation time of the microcapsules, coating efficiency and latency of the...

Preparation and curing behaviour of microencapsulated curing agents for

This study aimed to improve control over the curing behaviour of cold-mixed epoxy asphalt by using a microencapsulated curing agent (2-PZ@PC). Prepared through solvent evaporation, the 2-PZ@PC microcapsules had 2-phenylimidazole as the core material and polycarbonate as the shell material.

A curing agent for epoxy resin based on microencapsulation of 1

In the curing reaction of the epoxy resin, the 1BMI-MCs exhibited a delayed kinetic behavior compared to pure 1BMI. Furthermore, the E-51/MCs system had a storage term of 16 weeks. The shell material not only had no effect on curing effect of E-51, but also toughen the cured EP systems.

One

Epoxy adhesives containing microcapsules have high storage stability. Epoxy resin (EP) adhesive is an essential thermosetting polymer used in coating. A curing agent is typically added to the epoxy system during the curing process in order to obtain a three-dimensional network structure.

In modern industry and materials science, epoxy curing agents, as critical chemical substances, are widely used in the curing process of epoxy resins. traditional epoxy curing agents often have limitations, such as flammability, explosiveness, and high volatility, which restrict their application in specific environments. To address these issues, researchers have developed an innovative epoxy curing agent microcapsule technology. By encapsulating the curing agent within tiny capsules, this technology achieves safe packaging and controlled release of the curing agent, resolving the safety hazards associated with traditional curing agents. This article explores the concept, preparation methods, safety analysis, and application prospects of epoxy curing agent microcapsules.

I. Concept and Characteristics of Epoxy Curing Agent Microcapsules

Epoxy curing agent microcapsules refer to a technology that encapsulates curing agents within microscopic capsules. These capsules are typically made of high-molecular-weight polymer materials, which protect the curing agent from external environmental effects while providing a controlled release mechanism. Compared to traditional curing agents, epoxy curing agent microcapsules have several significant advantages:

1. High Safety: The microcapsules seal the curing agent internally, reducing contact with air and other chemicals, thereby greatly lowering the risks of combustion and explosion.
2. Good Stability: The curing agent inside the microcapsules remains stable for extended periods, avoiding issues caused by rapid evaporation and incomplete curing.
3. Controlled Release: By adjusting the size and quantity of the microcapsules, precise control over the release of the curing agent can be achieved to meet different application requirements.
4. Easy Storage and Use: Microcapsules can be conveniently packaged and transported, and only simple processing is needed before use to initiate the reaction.
5. Environmental Friendliness: The use of microcapsules reduces the volatilization and leakage of curing agents, minimizing environmental pollution.

II. Preparation Methods for Epoxy Curing Agent Microcapsules

The preparation process of epoxy curing agent microcapsules includes the following key steps:

1. Substrate Selection: Appropriate high-molecular-weight polymers, such as polyamides or polyacrylates, are chosen as the base material for the microcapsules.
2. Curing Agent Encapsulation: The selected curing agent is dissolved or dispersed in a suitable solvent, then encapsulated within the microcapsules through physical or chemical methods.
3. Drying and Curing: The encapsulated microcapsules are dried and cured to form a stable solid structure.
4. Post-Processing: Surface treatments, such as coating with hydrophilic materials or adding antioxidants, are applied to enhance performance and expand application scope.

III. Safety Analysis of Epoxy Curing Agent Microcapsules

Despite their advantages, the safety of epoxy curing agent microcapsules must be evaluated in practical applications. Key safety considerations include:

1. Thermal Stability: Microcapsules must exhibit good thermal stability to prevent rupture or premature release of the curing agent under high-temperature conditions.
2. Chemical Stability: Microcapsules should maintain stability in various acidic or alkaline environments.
3. Mechanical Strength: Microcapsules must withstand external pressure and friction without damage.
4. Biocompatibility: Materials used for microcapsules should be biocompatible to avoid adverse reactions with biological tissues.

IV. Application Prospects of Epoxy Curing Agent Microcapsules

Epoxy curing agent microcapsule technology has broad application potential, particularly in the following fields:

1. Aerospace: In aerospace, microcapsules can protect sensitive components from high temperatures, pressures, and radiation.
2. Electronics Industry: In electronics, microcapsules can encapsulate delicate components to improve product reliability and safety.
3. Biomedicine: In pharmaceuticals, microcapsules can be used for sustained or controlled drug release, enhancing therapeutic effects and reducing side effects.
4. Environmental Protection: In pollution control, microcapsules can efficiently remove contaminants from water bodies.

epoxy curing agent microcapsule technology offers an innovative solution to the safety challenges of traditional curing agents. By encapsulating curing agents within microcapsules, not only are stability and safety improved, but new application potentials across multiple fields are also unlocked. With ongoing technological advancements, epoxy curing agent microcapsules are poised to play an increasingly vital role in driving progress across industries.