1、Curing reactions of epoxy powder coatings in perspectives of chemical

Different from the previous reviews of powder coatings focusing on the formulation optimization and performance improvement, this review interprets curing reactions of epoxy powder coatings from the perspectives of chemical mechanism and selection strategy.

2、Calculation of Epoxy and Curing Agents

This work offers a unique way of preparing modified-aliphatic-polyamine curing agents, and provides an opportunity to better learn about the amine-adduct curing agents which are widely used in room-temperature-cure epoxy coatings and adhesives from these good model compounds.

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、Calculation Methods for Epoxy Resin and Curing Agents

In materials science, the ratio of epoxy resin (Epoxy Resin) to curing agent (Curing Agent) is a critical factor determining the final performance of the material.

5、Epoxy curing agent mixing calculation ratio

Calculate the amount of mixed curing agent to be used for 100 grams of E-51 Bisphenol A epoxy resin according to the formula for the amount of amine curing agent:

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.

Investigation of curing systems in modified epoxy anticorrosion

A two-layer adsorption model of the epoxy coating on the iron substrate surface was developed, and a solid-liquid diffusion model comprising the epoxy coating and water molecule layer was established to theoretically and computationally analyze the influence of the curing agent’s molecular structure on the adhesion and anti-corrosion ...

How to calculate the amount of epoxy curing agent?

The calculation method for the amount of amine curing agent is based on the consideration of an active hydrogen on the amine group and an epoxy group. The amount of various primary amines and secondary amines was obtained by the following formula: W= (M/Hn)×E;

11 EPOXY RESINS AND CURING AGENTS

Epoxy resins are converted to a thermoset state by chemical reaction between the resin and a curing agent. Depending on the curing agent this reaction can take place at elevated temperatures or at room temperature. The cured resins are not soluble in solvents and cannot be melted by heating.

Calculation Formula for the Dosage of Waterborne Epoxy Curing Agents

1、Dosage of Waterborne Epoxy Curing Agents Determining the appropriate dosage of waterborne epoxy curing agents involves balancing multiple factors, including resin type, curing conditions, substrate properties, and design requirements.

Epoxy coatings, as an indispensable material in modern industry and construction, are widely welcomed due to their excellent corrosion resistance, wear resistance, and aesthetic appeal. In the preparation of epoxy coatings, curing agents play a crucial role. They not only determine the performance of the coating but also affect the efficiency and cost of the entire coating process. exploring the properties, selection, and application of epoxy coating curing agents is of great significance for improving the overall performance of epoxy coatings.

I. Overview of Epoxy Coating Curing Agents

Epoxy coating curing agents are substances that promote chemical reactions in epoxy resins, forming a solid coating. Based on their chemical structures, curing agents can be classified into polyisocyanate-based, aromatic amine-based, acid anhydride-based, and other types. They react with active groups in epoxy resins to form stable three-dimensional network structures, endowing the coating with good mechanical strength, chemical resistance, and temperature tolerance.

II. Selection Criteria for Curing Agents

1. Performance Indicators

• Crosslinking Density: Higher crosslinking density results in greater hardness and strength of the cured coating.
• Volatility: Low volatility helps reduce odor issues during application and minimizes environmental pollution.
• Color Stability: Good color stability prevents discoloration of the coating, preserving its appearance.

2. Application Requirements

• Environmental Factors: Different application scenarios require specific curing agent properties. For example, outdoor or humid environments demand curing agents with good weather resistance.
• Cost Considerations: High-performance curing agents should be selected while ensuring cost-effectiveness.

III. Common Types of Curing Agents and Their Characteristics

1. Polyisocyanate-Based Curing Agents

These curing agents are known for their high crosslinking density and excellent mechanical properties, making them suitable for applications requiring high strength and hardness. For instance, polyurethane (PU) curing agents, due to their flexibility and oil resistance, are widely used in automotive paint protection coatings.

2. Aromatic Amine-Based Curing Agents

Aromatic amine-based curing agents offer good chemical resistance, making them ideal for anti-corrosion coatings on chemical equipment and pipelines. they tend to have strong odors and higher costs.

3. Acid Anhydride-Based Curing Agents

Acid anhydride-based curing agents exhibit good thermal stability and temperature resistance, suitable for high-temperature applications. their strong odor limits their use in civilian fields.

IV. Selection and Application of Curing Agents

Choosing the appropriate curing agent is critical to ensuring the quality of epoxy coatings. In practice, the selection should be based on the type of coating, application scenario, and performance requirements. Additionally, attention must be paid to details such as curing agent ratios, mixing methods, and application techniques to achieve optimal coating effects and quality.

The selection and application of epoxy coating curing agents involve multiple considerations. Only by fully understanding the properties of curing agents, selecting the appropriate types, and applying them rationally can the performance of epoxy coatings be optimized. With advancements in technology and growing environmental awareness, future curing agents will prioritize environmental protection and performance balance, offering broader development opportunities for epoxy coatings.