Paint chemicals

Performance Features

Automotive or industrial coatings: High gloss, hardness,film fullness, miscibility with acrylic resins

Alkyd Resins: Technical Overview

Category	Specifications
Definition	Polyester resins modified with fatty acids, offering versatile film-forming properties
Chemical Base	Polyol + Dibasic Acid + Fatty Acid (Oil Modification)

Classification by Oil Length

Type	Oil Content (%)	Drying Time	Typical Applications
Short Oil	<40%	Air-dry: 4-8 hrs Bake: 120°C×30min	Industrial enamels Metal coatings
Medium Oil	40-60%	Air-dry: 2-6 hrs	Architectural paints Trim enamels
Long Oil	>60%	Air-dry: 1-4 hrs	House paints Varnishes
Oil-Free	0%	Thermosetting only	High-performance coatings

Key Technical Properties

Property	Short Oil	Medium Oil	Long Oil
Viscosity (25°C)	2.000-5.000 cP	1.000-3.000 cP	500-1.500 cP
Solvent Content	40-60%	30-50%	20-40%
Gloss Retention	Excellent	Good	Moderate
Flexibility	Fair	Good	Excellent

Drying Mechanisms

System	Catalyst	Drying Process	Film Characteristics
Oxidative	Metal driers (Co/Mn)	Air oxidation of double bonds	Flexible, decorative
Thermoplastic	None	Solvent evaporation	Reversible films
Thermosetting	Amino resins	Crosslinking at 120-150°C	Hard, chemical-resistant

Modification Types

Modifier	Content (%)	Enhanced Properties	Trade-offs
Soybean Oil	50-70	Better yellowing resistance	Slower drying
Linseed Oil	40-65	Faster drying	More yellowing
Coconut Oil	30-50	Color stability	Reduced flexibility
Phenolic	10-20	Chemical resistance	Darker color

Performance Comparison

Parameter	Alkyd	Acrylic	Polyurethane
Cost Efficiency	★★★★★	★★★	★★
Gloss Development	★★★★	★★★	★★★★★
Exterior Durability	★★★	★★★★	★★★★★
Brushability	★★★★★	★★★	★★

Industrial Applications

Sector	Product Examples	Resin Preference
Architectural	Interior/exterior paints	Long oil alkyds
Industrial Maintenance	Storage tank coatings	Medium oil phenolic-modified
Automotive	Primer surfacers	Short oil baked alkyds
Wood Finishing	Varnishes, stains	Long oil tung/linseed blends