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High hydroxyl functionality for excellent crosslinking density with melamine and polyisocyanate curing agents.
Outstanding weather resistance and UV stability, suitable for demanding exterior coatings.
Good solubility in common organic solvents including xylene, toluene, and ester-based blends.
Balanced molecular weight distribution ensures optimal flow, leveling, and film formation.
Low VOC formulation support—designed for compliance with modern environmental regulations.
Automotive OEM and refinish topcoats requiring high gloss and long-term durability.
Industrial maintenance coatings for metal substrates exposed to harsh outdoor conditions.
Powder coating hybrid systems where acrylic resin enhances flexibility and impact resistance.
Architectural coil coatings for pre-painted steel used in roofing and façade applications.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear, pale yellow to amber liquid |
| Solvent System | Aromatic hydrocarbons (e.g., xylene/toluene blend) |
| Hydroxyl Value (mg KOH/g) | 65–75 |
| Acid Value (mg KOH/g) | < 5 |
| Non-Volatile Content (% by weight) | 50 ± 2 |
| Viscosity (25°C, mPa·s) | 800–1,200 (Brookfield, spindle #4, 20 rpm) |
Q1: What is the primary function of LR-7506 in coating formulations?
A: LR-7506 serves as a hydroxyl-functional acrylic resin designed to act as a reactive co-resin in thermosetting systems—particularly with amino resins (e.g., melamine or urea formaldehyde) and polyisocyanates. It contributes to crosslink density, enhancing hardness, chemical resistance, and film integrity upon cure.
Q2: Is LR-7506 suitable for high-solids or low-VOC applications?
A: Yes—LR-7506 is formulated with a relatively low molecular weight and controlled viscosity, making it well-suited for high-solids coatings and VOC-reduced systems. Its solubility in common organic solvents (e.g., xylene, butyl acetate, PGMEA) supports efficient formulation without excessive thinning.
Q3: How does LR-7506 compare to conventional polyester-based hydroxyl resins in terms of weathering performance?
A: As an acrylic resin, LR-7506 offers inherently superior UV stability and color retention compared to many aromatic polyester hydroxyl resins. It is commonly selected for exterior topcoats where long-term gloss retention and resistance to chalking are critical.
Q4: Can LR-7506 be used in ambient-cure or forced-dry industrial coatings?
A: LR-7506 is primarily intended for thermally cured systems (typically 120–160 °C), where full crosslinking develops optimal performance. While some reactivity may occur at ambient temperatures with highly active curing agents, reliable film properties require thermal activation.
Q5: What solvent compatibility should be considered during formulation?
A: LR-7506 exhibits good compatibility with aromatic hydrocarbons, esters, ketones, and glycol ethers. Avoid prolonged exposure to strong protic solvents (e.g., alcohols, water) unless specifically stabilized, as they may impact solution stability or shelf life.
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E-mail: wangxingqiang@ericwchem.com
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