Methylated Melamine Resin

We specialize in providing high-quality Methylated Melamine Resin for industrial clients across various sectors. Whether you need chemicals consultation, technical support, or detailed information about our production capabilities, our team is here to help.

Category:Coating Additives   MOQ:100KG  Shipped directly from China

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Introduction

This category of products mainly consists of methanol and hydroxymethyl melamine reacting in different molar ratios to form highly methylated, partially methylated, and highly imido methylated melamine resin products. This series of products can react with functional polymers with hydroxyl, carboxyl, and amide groups to produce flexible, scratch resistant, and adhesive products, which are widely used in coating systems based on acrylic acid, polyester, alkyd, epoxy resin, and polyurethane.

High solid methyl etherified melamine resin products
MT 300 White waxy solid ≥98 ≤0.1 Fully methylated hexahydroxymethyl melamine resin
MT 303 Colorless viscous liquid ≥98 2000-6000 ≤0.3 Highly methylated hexahydroxymethyl melamine resin
MT 303lf Colorless viscous liquid ≥98 2000-6000 ≤0.1 low free formaldehyde303
MT 303w Colorless viscous liquid ≥96 2000-6000 ≤0.5  303
High iminomethylated dense amine resin
MT 325 Colorless viscous liquid 78-82 2500-4500 ≤0.75 Fast curing, no need for strong acid catalysis, low formaldehyde emission
MT 327 Colorless viscous liquid 88-92 5100-16000 ≤0.8 Fast curing, no need for strong acid catalysis, low formaldehyde emission
MT 385 Colorless viscous liquid 76-81 1000-1600 ≤0.4 Fast curing, no need for strong acid catalysis, low formaldehyde emission
Part of the methylated melamine resin
MT 370 Colorless viscous liquid 86-90 5100-10200 ≤3.5 No need for curing, no need for strong acid catalysis
MT 380 Colorless viscous liquid 76-82 1200-3500 ≤2.5 No need for curing, no need for strong acid catalysis

Methylated Melamine Resins: Technical Overview

Category Specifications
Definition Thermosetting amino resins formed by reacting melamine with formaldehyde and methanol, used as crosslinkers in coatings and adhesives
Chemical Structure Polymeric methylol melamine ethers

Types of Methylated Melamine Resins

Type Methylation Degree Solubility Curing Conditions
Partially Methylated 50-70% methyl groups Water-soluble Acid catalyst, 120-150°C
Fully Methylated >90% methyl groups Organic solvent-soluble Self-crosslinking, 140-180°C
High-Imino Low methylation, high NH groups Water/organic soluble Low-temperature cure (100-130°C)

Key Properties & Performance

Property Typical Value Test Method
Non-Volatile Content 80-100% ISO 3251
Viscosity (25°C) 500-3000 mPa·s ISO 3219
Free Formaldehyde <1% DIN EN ISO 9397
Gel Time (150°C) 3-10 minutes ASTM D2471

Comparison with Other Amino Resins

Parameter Methylated Melamine Urea-Formaldehyde Benzoguanamine
Weather Resistance Excellent Poor Good
Chemical Resistance High (acids, alkalis) Moderate Moderate
Flexibility Moderate Brittle Good
Cost High Low Very High

Formulation Guidelines

Component Role Typical Loading (wt%)
Melamine Resin Crosslinker 10-30% (on resin solids)
Hydroxyl Polymer (e.g., polyester, acrylic) Main resin 70-90%
Acid Catalyst (e.g., p-TSA) Cure accelerator 0.1-1.0%
Flow Additives Surface leveling 0.5-2.0%

Industrial Applications

Industry Use Case Resin Type Preferred
Automotive Clearcoats, basecoats Fully methylated, high-gloss
Coil Coatings Pre-painted metal Partially methylated, flexible
Wood Coatings Furniture lacquers High-imino, fast-cure
Can Coatings Food-contact linings Fully methylated, FDA-compliant

Curing Mechanism & Conditions

Stage Process Temperature/Time
Methylol Condensation Ether crosslinking 100-140°C, 10-30 min
Self-Crosslinking Residual –CH₂OH groups react >150°C, 5-15 min
Post-Cure Full network formation 24h at ambient

Advantages & Limitations

Advantage Technical Benefit Limitation Challenge
High hardness Scratch-resistant films Brittleness Requires plasticizers
Excellent gloss Automotive-grade finish High cost Limited to premium applications
Low-VOC Water-based options available Slow cure Needs acid catalysts

 

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