Hello everyone, today I will talk about the types and characteristics of epoxy resin curing agents. Whether you are doing epoxy flooring, epoxy colored sand, or self-leveling, choosing the right curing agent is really too important!
This article introduces five common types of epoxy resin curing agents used in applications such as epoxy flooring, colored sand, and self-leveling. Among them, amine types (including aliphatic amines, aromatic amines, and modified amines/cycloaliphatic amines) are the most commonly used and can cure at room temperature; modified amines feature low odor, low toxicity, and good toughness. Polyamide curing agents offer excellent toughness and strong adhesion, making them suitable for primers and renovation. Anhydride types require heat curing and are heat-resistant but are essentially not used in flooring. Latent curing agents are used in one-component heat-curing scenarios. Waterborne epoxy curing agents are environmentally friendly and allow application on damp surfaces. The concluding recommendation is: modified amines/cycloaliphatic amines are preferred for colored sand and residential self-leveling, polyamides for industrial flooring, and waterborne curing agents when damp conditions or high environmental requirements are present.
I. Amine Curing Agents (Most Commonly Used, Room-Temperature Curing)
- Aliphatic amines (ethylenediamine, diethylenetriamine, triethylenetetramine)
- Features: Cures at room temperature, fast curing, rapid strength development.
- Disadvantages: Strong odor, high volatility, relatively high toxicity, becomes brittle after curing, average temperature resistance (within 80℃).
- Suitable for: general epoxy flooring, primer, quick repair, basic epoxy terrazzo.
- Aromatic amines (m-phenylenediamine, DDM)
- Features: Good heat resistance, strong chemical resistance, high strength, suitable for high-temperature environments.
- Disadvantages: Requires heat curing (around 120℃), high toxicity, dark color, cannot be used for light-colored self-leveling.
- Suitable for: high-temperature resistant anti-corrosion, industrial heavy-duty anti-corrosion; not suitable for decorative colored sand in home applications.
- Modified amine / cycloaliphatic amine (currently mainstream)
- Features: low odor, low toxicity, room temperature curing, with much better water resistance, weather resistance, and toughness than ordinary aliphatic amines.
- Suitable for: epoxy colored sand, residential self-leveling, high-end flooring, food-grade workshops. Currently, 90% of the colored sand on the market uses this type of curing agent.
II. Polyamide curing agent (most stable, most flexible)
- Features: Almost odorless, low toxicity, high tolerance for mixing ratio, after curing good flexibility, strong adhesion, impact resistance.
- Disadvantages: Slow curing, slow reaction at low temperatures (below 10℃), prone to tackiness.
- Suitable for: epoxy primer, intermediate coat, old floor renovation, flooring requiring flexibility, good compatibility with the main agent, not prone to wrinkling or cracking.
III. Anhydride curing agents (high temperature resistance, excellent electrical properties)
- Features: High temperature resistance (150℃+), low shrinkage, good insulation.
- Disadvantages: Must be heat-cured (above 100°C), not suitable for on-site construction.
- Suitable for: electronic potting, high-temperature resistant molds, high-voltage insulating parts; not used for flooring or colored sand basically.
IV. Latent Curing Agents (for One-Component Systems)
- Features: No reaction at room temperature, cures only when heated, can be made into one-component epoxy, no on-site mixing required.
- Disadvantages: high cost, requires heating equipment, construction is limited.
- Suitable for: factory prefabricated parts, one-component epoxy coatings, high-end sealants.
V. Waterborne Epoxy Curing Agents (Mainstream Eco-friendly Option)
- Features: Water-based, odorless, eco-friendly, applicable on damp surfaces, meeting the environmental requirements for residential and commercial decoration.
- Disadvantages: slow curing, sensitive to temperature and humidity, slightly poorer water resistance than solvent-based.
- Suitable for: water-based epoxy flooring, home self-leveling, children's room / kitchen colored quartz sand, water-based renovation of old floors.
Summarize in one sentence.
- For epoxy colored sand, residential self-leveling: choose modified amine / cycloaliphatic amine (low odor, water-resistant, light color).
- For industrial flooring, primer and intermediate coat: choose polyamide (good toughness, stable).
- For environmentally friendly, damp ground: choose water-based epoxy curing agent.
Choose the right curing agent, no peeling, no blushing, no yellowing, sufficient hardness, strong water resistance!