1、Functional dendritic curing agent for epoxy resin: Processing

Considering the advantage of dendrimers, such as high density of functional terminal groups, greater solubility in resins, we proposed to use them as modifying agents to prepare functionalized curing agents for curing and toughening epoxy resins.

2、Novel Thermal Latent Curing Agents for Epoxy Resins Based on Dual

In this work, we propose novel 4MApy-based thermal latent curing agents for epoxy resins with dual-locked protection by benzamide and N-oxide groups (Figure 1a).

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、Huntsman Epoxy Curing Agent NCO

Huntsman’s epoxy curing agent NCO is a specialized chemical compound that reacts with epoxy resins to form a stable three-dimensional network structure. This imparts superior mechanical properties and chemical resistance to the epoxy resin.

Epoxy terminated, urethane

The NCO groups in the PEEK chains react with the secondary hydroxyl groups in the epoxy molecules creating urethane bridges between them. After the reaction, the peak corresponding to the NCO group has completely disappeared, confirming the anchoring of PEEK segments on to the epoxy chain backbones.

Epoxy Curing Agents

This chapter focuses on epoxy curing agents, also known as curatives, which include crosslinkers and catalysts.

Formulating Epoxy Systems: Resins and Curing Agents

When choosing curing agents, in order to help in attaining the desired properties in a wide range of applications, here are some of the options while formulating an epoxy system:

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.

Novel waterborne polymeric crosslinkers containing blocked isocyanate

In this study, we synthesized an active intermediate contain-ing hydroxyl and epoxy groups, and then introduced it into the polymer chain to obtain novel waterborne crosslinkers containing active epoxy and blocked NCO groups, which are expected to be used to achieve dual-crosslinked elec-trophoretic coating films.

Investigation of curing systems in modified epoxy anticorrosion

This study elucidated the mechanism by which the molecular structure of the curing agent influenced the anti-corrosion performance of epoxy coatings, further improving the research method for studying the constitutive effects of the curing agent system in simulation work on anti-corrosive coatings, and providing effective guidance for screening ...

Epoxy curing agents are critical additives used in epoxy floor coatings, composite materials, and sealants. They chemically react with epoxy resins to harden materials and enhance their properties. Among epoxy curing agents, the NCO (isocyanate) group is a common functional group that undergoes addition reactions with epoxy groups, forming stable cross-linked networks. This reaction improves mechanical strength, chemical resistance, adhesion, and durability of the materials.

I. Overview of NCO-Based Epoxy Curing Agents

NCO-based epoxy curing agents are compounds containing NCO groups (-NCO) in their molecular structure. These groups provide enhanced reactivity during the curing process, enabling more thorough and uniform cross-linking.

II. Characteristics of NCO-Based Epoxy Curing Agents

1. High Reactivity: NCO groups exhibit rapid reactivity with various epoxy groups, facilitating quick formation of cross-linked networks and improved mechanical properties.
2. Broad Applicability: Compatible with diverse epoxy resins, including general-purpose, modified, and specialty types, making them versatile for coatings, composites, and sealants.
3. Chemical Resistance: The ability of NCO groups to react with multiple epoxy groups results in excellent chemical resistance, crucial for applications in the chemical, petroleum, and natural gas industries.
4. Strong Adhesion: NCO groups form stable chemical bonds with various substrates, enabling their use in bonding composites, metals, and ceramics.

III. Preparation Methods for NCO-Based Epoxy Curing Agents

The synthesis involves two main steps:

1. Synthesis of NCO-Containing Compounds: Nitrogen-containing compounds (e.g., ammonia) react with formaldehyde to form intermediates like formamide, which are then converted into NCO groups.
2. End-Capping Treatment: Compounds are modified with end-capping agents (e.g., phenolic compounds) to produce prepolymers or low-viscosity liquids, encapsulating NCO groups within the molecular chain.

IV. Applications of NCO-Based Epoxy Curing Agents

1. Coatings Industry: Used as primary components in coatings, combined with resins, pigments, and additives to create products with superior weather resistance, wear resistance, and adhesion.
2. Composites: Act as binders for fibers or fillers, producing high-performance composites with excellent mechanical, corrosion, and thermal properties for aerospace and automotive industries.
3. Sealants: Formulated into sealants with resins, plasticizers, and curing agents, offering exceptional sealing, temperature resistance, and aging resistance.

V. Future Prospects and Challenges

Growing technological and industrial demands will increase the need for NCO-based epoxy curing agents. Researchers must develop new synthesis methods to enhance performance and reduce costs. Additionally, stricter environmental regulations require ensuring eco-friendly production and application.

NCO-based epoxy curing agents are indispensable in multiple fields. Ongoing innovation and technical advancements will drive their evolution, supporting broader industrial applications.