1、Interphase Reaction of Isocyanates with Epoxy Resins

Interphase reactions between cured epoxy resins and isocyanates are investigated. The epoxy resins contain secondary hydroxyl groups as reactive groups only or secondary hydroxyl plus amine. The isocyanate diffuses into the epoxy resin forming an interphase with a thickness of some micrometers.

2、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.

3、Para‐Toluenesulfonyl Isocyanate‐Ethylenediamine Adduct as a Thermal

This study focused on the synthesis, characterization, and application of a reversible thermal latent curing agent, p-toluenesulfonyl urea ethylenediamine, obtained through the reaction of p-toluenesulfonyl isocyanate with ethylenediamine.

4、High

The purpose of this paper is to investigate a new group of chemical compounds as accelerators (1-imidazole derivatives – tertiary amines) for curing of isocyanate-epoxy resin matrix.

5、Curing mechanism of isocyanate/epoxy resin

The DSC results showed that three reactions mainly occurred during the curing process of epoxy/isocyanate system corresponding to three exothermic peaks.

Curing reactions of epoxy powder coatings in perspectives of chemical

The properties of the cured products of epoxy powder coatings are dominated by the curing systems. This review discusses the types, reaction principles, characteristics of curing agents and accelerators that participate in the curing reaction with different epoxy resins.

Curing Agent: Types & Process of Curing Agents for Epoxy Resin

This is because they have a long pot life and form cured resins having electrical, chemical, and mechanical properties. Usually, they are used with an amine to accelerate the curing.

Curing mechanisms and mechanical properties of cured epoxy resins

Inthis review, theeffect ofthe cured epoxy resins onthe dynamic echanical prop- erties of poxy resins isdiscussed. Themechanical properties and ynamic e hanical properties of hcured epoxy resins are governed by their structures.

FUNCTIONAL VIA ISOCYANATE

e, and Hart Haugen The Sherwin-Williams Company In this work centering around phenolic chemistry, we investigated isocyanate and benzoxazine-modified phenolic powder coatings for use in anti-grafiti applications and for addressi.

Curing of epoxy oligomers by isocyanates

In the curing of epoxies by isocyanates the reaction between oxirane cycle and isocyanate (NCO) groups is of great importance, in addition to urethane formation due to the interaction between the secondary hydroxyl groups of epoxy oligomers and isocyanate groups.

In modern materials science and engineering, epoxy resins are widely utilized across various fields due to their exceptional physical and chemical properties. Among these, isocyanate curing agents, as critical hardeners for epoxy resins, play a pivotal role. This article provides an in-depth analysis of the fundamental principles, application ranges, preparation methods, and precautions of isocyanate curing agents, exploring their significance and importance in epoxy systems.

1. Fundamental Principles of Isocyanate Curing Agents

Isocyanate curing agents react with epoxy resins to form stable three-dimensional network structures, a process known as curing. This curing process enhances mechanical strength, chemical resistance, and thermal stability, while also imparting excellent electrical insulation and moisture resistance. The reaction mechanism typically involves chemical interactions between epoxy groups and isocyanate groups, forming carbon-nitrogen bonds to achieve crosslinking.

2. Application Fields

1. Construction: Isocyanate-cured epoxy resins are used in high-performance building materials such as flooring, exterior wall coatings, and waterproof membranes due to their superior mechanical properties, chemical resistance, and weatherability.
2. Electronics and Electrical Engineering: Epoxy-based composites are favored in electronic packaging, semiconductor encapsulation, and electrical equipment due to their优异的 electrical insulation and mechanical strength.
3. Automotive Industry: Epoxy-based composites are employed in automotive body parts and chassis components to improve vehicle performance and safety.
4. Aerospace: Their耐高温 and impact resistance make epoxy composites suitable for critical aerospace components like aircraft fuselages and engine parts.
5. Sports Equipment: Epoxy composites enable the production of lightweight, durable, and high-strength sports gear.

3. Preparation Methods

The preparation of isocyanate-cured epoxy resins involves the following steps:

1. Mixing: Epoxy resin, curing agent (isocyanate), and additives (e.g., fillers, pigments, solvents) are blended in specific ratios.
2. Molding: The mixture is poured into molds and shaped via methods like hot pressing or cold pressing.
3. Curing: The molded samples undergo thermal treatment in ovens to fully cure into the desired shape and size.

4. Precautions

When using isocyanate-cured epoxy resins, consider the following:

1. Safety: Isocyanates emit irritating fumes; wear appropriate personal protective equipment (PPE) to avoid inhalation or skin contact.
2. Environmental Impact: Minimize waste and properly manage disposal to mitigate potential pollution from isocyanate curing agents.
3. Quality Control: Ensure raw material purity and reactivity through rigorous testing to guarantee product consistency.
4. Storage: Store materials in cool, dry conditions away from direct sunlight and heat.

5. Future Prospects

Advancements in technology and eco-conscious demands will drive the development of sustainable, environmentally friendly epoxy composites. Key trends include:

• Low-VOC curing agents and bio-based substitutes for traditional chemicals.
• Integration of intelligent and green manufacturing technologies to revolutionize production and applications.

isocyanate-cured epoxy resins, as high-performance materials, hold immense potential. With ongoing innovation, they are poised to play a transformative role in broader applications, driving progress in society and industry.