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Summary Note
Epoxy resin lacks good light resistance, but it excels in corrosion resistance, chemical resistance, and adhesion. This resin can be used as a one-part heat-curing type or a two-part room-temperature curing type paint.
1. What is Epoxy Resin?
Epoxy resin is a compound that contains a special epoxy group, typically having two or more epoxy groups within its molecules. Unlike polyester or acrylic resins, which are named based on how monomers polymerize, epoxy resin is named due to its unique epoxy groups. Bisphenol A type epoxy resin is commonly used, with a typical polymerization degree of 2 to 20. This resin is used in paints.
2. Features
Epoxy resin is known for its excellent corrosion and chemical resistance, forming a hard coating and serving as an excellent insulating material. However, it is sensitive to UV rays, making it less weather-resistant and prone to poor light resistance. It is also hard but can be brittle, and it’s not very impact-resistant. During the curing process, hydroxyl groups are formed, contributing to strong adhesion to metal surfaces.
3. Usage
Epoxy resin is used as a primer or for coating the inside of cans in places where corrosion resistance is necessary, and weather resistance is not a priority. You can either directly react it with a curing agent or use modified resins with epoxy groups. For curing, there’s a room-temperature curing epoxy resin with amino groups used as a curing agent, which is employed in applications requiring chemical resistance and corrosion protection, such as large steel structures, ships, and concrete structures. Curing agents can be aliphatic polyamines or aromatic polyamines, but some of them require heating. Other curing agents include anhydrides, ketimines, dicyandiamide, imidazoles, and polymeric mercaptans. Epoxy resin can also be modified by reacting it with polyol resins using diaralkanolamines and crosslinking with isocyanates. Modified epoxy resins are used in industrial painting applications like cationic electrodeposition coating.
| Paint condition | Form | Curing method | Epoxy resin | Hardener or crosslinker | Curing temperature
| Application |
| Liquid state | Two-component type | Room temperature curing | Epoxy Modified Epoxy Tar epoxy | Polyamide, Polyamine, Polyisocyanate | Natural drying | Chemical plants, exterior, marine bridges, pipe marine structures, concrete |
|
One-component type | Epoxy ester | Plant Machinery | ||||
| Baking cure |
Epoxy | Polyisocyanate | 80-100 | Plastic | ||
| Alkyd resin | 80-100 | Automobile Electrical appliance | ||||
| Thermosetting acrylic | 150 | Automobile Electrical appliance | ||||
| Melamine resin | 180-200 | Electrical appliance | ||||
| Urea resin | 180-200 | Electrical appliance | ||||
| Phenolic resin | 180-200 | Food can, wire | ||||
| Water dispersion | One-component type | Cationic electrodeposition baking cure | Dialkyl alkanolamine Adduct epoxy resin | Phenolic resin, anhydride Dicyanopolycarboxylic acid hydrazide | 160-180 | Automobile Aluminum products |