1、Hardness Standards for Epoxy Curing Agents in Jiangsu

Epoxy curing agents, chemicals used to accelerate the curing reaction of epoxy resins, are widely applied in industries such as electronics, electrical equipment, construction, and automotive manufacturing.

2、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.

3、环氧树脂固化剂的常见类型及其固化机理

潜伏固化剂可与环氧树脂混合制成液态化合物，简化环氧树脂产品的应用，其应用范围从单一的包装胶粘剂向涂料、浸渍漆、灌封料、粉末涂料等多方面发展。

Curing Agents for Epoxy Resin (固化剂)

The epoxy resin compositions of Three Bond currently on the market are the Three Bond 2000 Series (base agent for epoxy resin), the Three Bond 2100 Series (curing agent for epoxy resin), and the Three Bond 2200 Series (one-part thermal cure epoxy compound resins).

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:

Synthesis and curing properties of fluorinated curing agent for epoxy

In the present work, we propose an entirely new biphenylamine-based curing agent (AFPCO) as an alternative to the commercially available curing agent 4,4`-diaminodiphenylmethane (DDM). Notably, AFPCO was synthesized from natural daidzein. The structure of the compound was determined by IR, 1 H NMR, 13 C NMR, and 19F NMR.

Epoxy Curing Agents – Part 1: Amines

Part 1 of this blog series has given a general introduction to amines, the largest class of curing agents for epoxy resins. We have a general understanding of how amines work and how to calculate the amount of amine required to cure an epoxy resin.

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...

Chemical Formulas of Epoxy Resin Curing Agents

The chemical formulas of epoxy resin curing agents reveal their intricate compositions and mechanisms. By understanding their chemical properties and principles, we can better leverage their applications across fields and develop higher-performance products.

Products

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Chemical Formulas of Epoxy Curing Agents in Jiangsu

In modern industry, epoxy resins are one of the most important materials, widely used in coatings, adhesives, composite materials, and electronic encapsulation. Epoxy curing agents are a critical component in enabling these applications. This article explores the chemical formulas of epoxy curing agents and analyzes their significant role in industrial production.

I. Definition and Classification of Epoxy Curing Agents

Epoxy curing agents are substances that promote the curing of epoxy resins, typically containing reactive functional groups (such as epoxy groups). Based on their chemical composition and function, epoxy curing agents can be classified into several types:

1. Amine-Based Curing Agents: These contain amino or diamino groups and react with epoxy groups in epoxy resins to form stable polymers. Common examples include bisphenol A amine and polyamines.

2. Anhydride-Based Curing Agents: These contain carboxylic acid anhydride or lactone groups and react with epoxy groups to form stable polymers. Examples include phthalic anhydride and trimellitic anhydride.

3. Anhydride-Amine Hybrid Curing Agents: Combining the advantages of both anhydride and amine curing agents, these offer higher reactivity and better performance. An example is phthalic anhydride-bisphenol A amine.

4. Other Specialized Epoxy Curing Agents: In addition to the above, specialized curing agents such as imidazolines, pyridine, and sulfides can also react with epoxy resins.

II. Chemical Formulas of Epoxy Curing Agents

To understand the chemical formulas of epoxy curing agents, knowledge of their molecular structures is essential. For example, the chemical formula of commonly used bisphenol A amine is C₆H₅C(CH₃)₂NH₂, where C represents carbon atoms, H hydrogen atoms, C₆H₅ denotes the benzene ring structure, (CH₃)₂ represents two methyl groups, and NH₂ is the amino functional group.

For other types of epoxy curing agents, their chemical formulas vary but follow similar principles. For instance, the formula for phthalic anhydride is C₈H₄O₃, while lactones are represented by C₅H₈O₂. Anhydride-amine hybrid curing agents have more complex formulas due to multiple reactive functional groups.

III. Mechanism of Action of Epoxy Curing Agents

The mechanism of epoxy curing agents involves chemical reactions with epoxy groups in epoxy resins to form stable polymer networks. This process typically includes:

1. Activation of Epoxy Groups: Epoxy groups are activated under catalytic conditions, releasing free radicals.

2. Initiation of Polymerization: Free radicals react with reactive functional groups in the curing agent, forming new chemical bonds and initiating polymerization.

3. Chain Growth: As polymerization progresses, new chemical bonds accumulate, forming long-chain polymers.

4. Crosslinking Reactions: When the polymer network reaches a certain length, crosslinking occurs, densifying the network and enhancing mechanical properties and thermal resistance.

IV. Applications of Epoxy Curing Agents

Epoxy curing agents have diverse industrial applications:

1. Coatings Industry: They improve adhesion, wear resistance, and corrosion resistance. Examples include epoxy floor coatings and anti-corrosion coatings.

2. Adhesives Industry: They enhance bonding strength and weather resistance. Common products include epoxy resin glues and polyurethane adhesives.

3. Composite Materials Industry: They boost mechanical performance and heat resistance. Examples include carbon fiber and glass fiber composites.

4. Electronic Encapsulation: Used to bond chips, wires, and other components, improving stability and reliability of electronic devices.

As essential auxiliary materials for epoxy resins, the study and analysis of epoxy curing agents’ chemical formulas are crucial for understanding their properties and applications. By researching their formulas and mechanisms, we can better leverage their roles across industries, providing robust support for industrial production.