Fully Methylated Melamine-Formaldehyde Resin
Coating Additives 2025-03-13
Fully Methylated Melamine-Formaldehyde Resin (FMMF): Overview and Key Properties
| Category | Details |
|---|---|
| Chemical Type | Hexamethoxymethylmelamine (HMMM) |
| CAS Number | 3089-11-0 |
| Appearance | Colorless to pale yellow viscous liquid |
| Solubility | Soluble in water, alcohols, and most organic solvents |
Key Characteristics
Chemical Structure & Properties
| Property | Value | Significance |
|---|---|---|
| Methylation Degree | >95% | Ensures complete reactivity |
| Viscosity (25°C) | 300–800 mPa·s | Impacts application flow |
| pH | 8.5–10.5 | Stabilizes resin in storage |
| Reactive Sites | 6 methoxy groups per molecule | High crosslinking density |
Curing Performance
| Parameter | Range | Notes |
|---|---|---|
| Self-Cure Temp. | 150–180°C | Requires strong acid catalyst |
| Co-Cure Temp. | 120–150°C | With hydroxyl/acid functional resins |
| Gel Time | 5–15 min @ 150°C | Catalyst-dependent |
Applications
Primary Uses
| Industry | Application | Key Benefit |
|---|---|---|
| Coatings | Automotive clearcoats | High gloss, chemical resistance |
| Textiles | Wrinkle-resistant finishes | Durable crosslinks |
| Paper | Wet-strength additives | Improves fiber bonding |
| Adhesives | Wood composites | Low formaldehyde emission |
Formulation Guidelines
| Component | Typical % | Purpose |
|---|---|---|
| FMMF Resin | 15–30% | Primary crosslinker |
| Acid Catalyst | 0.5–2% (e.g., p-TSA) | Cure acceleration |
| Co-Resin | 50–70% (e.g., acrylic/polyester) | Flexibility adjustment |
| Additives | 1–5% | Flow/leveling control |
Advantages vs. Alternatives
| Feature | FMMF | Partially Methylated MF | Urea-Formaldehyde |
|---|---|---|---|
| Reactivity | High | Moderate | Low |
| Formaldehyde Emission | Very Low | Moderate | High |
| Water Resistance | Excellent | Good | Fair |
| Cost | $$ | $ | $ |
Safety & Compliance
| Parameter | Status |
|---|---|
| VOC Content | <250 g/L (compliant) |
| Food Contact | FDA 21 CFR 175.300 |
| Storage | 12 months @ 25°C (inert atmosphere) |
Summary
Fully methylated melamine-formaldehyde resins deliver superior crosslinking efficiency with minimal formaldehyde release, making them ideal for high-performance coatings and industrial applications. Their high reactivity requires precise catalyst selection but enables energy-efficient curing processes.
DESCRIPTION
MT-803C is aspecially-designed hexamethoxymethy melamine resin.With its precisely controlled functionality,MT-803C
shows high reactivity to polyfunctional coating resins.lt is recommended for the application in conventional high solids and solvent-borne
coating systems.In comparison with butylated amino crosslinkers, only one-half amount of MT-803C is required to achieve superior physical and chemical properties of cured coatings, which includes fexibility gloss retention,hardness,impact resistance and MEK rub resistance.Among numerous types of methylated amino resins,MT-803C is the most versatile methylated melamine resin.
Appearance Clear, viscous liquid
Color, Gardner 1 maximum
Nonvolatile, weight % > 97%
(1.50g/15mins/150℃)
Viscosity, Gardner-Holdt, 25℃
X~Z3
Free formaldehyde, weight % <0.1%
APPLICATION
It has been widely applied in coil coatings, automotive coatings, can coatings, wood coatings and general metal coatings.
Packaging & Storage Stability
MT-803C resin is packaged in steel drums of 240kg net. Under normal storage environment at 30°c maximum,the storage stability of MT803LF
packed in original steel drums could last 24 months after manufactured date.
