【 WhatsApp】
+86-21-6420 0566
| OEM | OEM Services Provided |
| Feature | Good stability |
| Classification | Paint Additives |
| Advantage | Professional, Fast Delivery, Customizable | Samples | Apply for free，Contact Export Director now ↓ |
1. Performance Features
Hardeners are prepared using high-quality polyisocyanates. They have a high solid content and
excellent leveling, drying, weather resistance, and hardness.
2. Applications
Use in combination with two-component basecoat or clearcoat
Hardeners (curing agents) are essential components in thermosetting polymer systems, enabling crosslinking to achieve final material properties. Below is a structured technical summary:
| Type | Chemical Basis | Cure Temp | Pot Life | Key Features |
|---|---|---|---|---|
| Amines | Aliphatic/Aromatic amines | RT-150°C | 10min-24hr | Fast cure, high reactivity |
| Polyamides | Polyamine derivatives | RT-100°C | 1-8hr | Flexible, good adhesion |
| Anhydrides | Acid anhydrides | 80-200°C | 1-4hr | High Tg, low exotherm |
| Isocyanates | -NCO functional groups | RT-120°C | 5min-2hr | Moisture-sensitive, tough films |
| Catalytic | Lewis acids/bases | 50-250°C | N/A | Latent, heat-activated |
| Parameter | Amines | Polyamides | Anhydrides | Isocyanates |
|---|---|---|---|---|
| Cure Speed | Very Fast | Moderate | Slow | Fast |
| Flexibility | Low | High | Medium | High |
| Chemical Resistance | Excellent | Good | Excellent | Good |
| Moisture Tolerance | Poor | Good | Excellent | Poor |
| Resin System | Recommended Hardener | Mix Ratio | Cure Schedule |
|---|---|---|---|
| Epoxy | Amines/Polyamides | 1:1 to 1:4 | RT-24hr or 80°C-2hr |
| Polyester | Peroxides (MEKP) | 1-3% | RT-6hr or 60°C-1hr |
| Polyurethane | Isocyanates | 1:1 to 1:1.1 | RT-48hr or 80°C-30min |
| Phenolic | Hexamethylenetetramine | 5-15% | 150°C-30min |
| Factor | Considerations |
|---|---|
| Substrate | Metals: Amines/Anhydrides; Plastics: Polyamides |
| Service Temp | >150°C: Anhydrides; <80°C: Polyamides |
| Pot Life | Short: Amines; Long: Polyamides/Anhydrides |
| Regulatory | Low-VOC: Catalytic; Food-contact: Anhydrides |
| Issue | Mitigation |
|---|---|
| Skin Irritation (Amines) | Use PPE; substitute with modified amines |
| Moisture Sensitivity | Pre-dry substrates; use anhydrides |
| High Exotherm | Reduce cure rate; use latent hardeners |
Hardeners critically define cure kinetics and end-use properties of thermosets. Selection depends on resin chemistry, processing conditions, and performance requirements.
Declaration: The products displayed on this website are intended exclusively for industrial applications or scientific research. They are not intended for medical, pharmaceutical, or food use. In accordance with applicable laws and regulations, purchasing organizations must hold valid qualifications and approvals.
For help with solutions customized to your business needs, contact Export Director now.
With 30+ years of experience and We firmly believe that product quality is the basis of cooperation.
Chat Now
TEl
+86-21-6420 0566
