Bisphenol A Vinyl Ester Resin (Standard)
Key Features
- Epoxy backbone provides superior chemical resistance vs. UPR
- Higher toughness and elongation than isophthalic UPR
- Processes like UPR — compatible with standard MEKP/cobalt
- Excellent glass fiber adhesion via pendant hydroxyl groups
- Ideal marine barrier coat material
Bisphenol A Vinyl Ester Resin (Standard Grade) is produced by reacting bisphenol A diglycidyl ether (BADGE) epoxy resin with methacrylic acid, capping the terminal epoxide groups with methacrylate functionality. The resulting resin is dissolved in styrene at 35-45% to produce a reactive solution that combines the chemical resistance of the epoxy backbone with the processing convenience of a UPR-type peroxide/amine cure system.
Compared to isophthalic or orthophthalic UPR, vinyl ester resins offer superior toughness, elongation, and chemical resistance. The pendant hydroxyl groups along the backbone and the methacrylate terminal double bonds provide excellent adhesion to glass fibers and high cross-link density on cure. Cured laminates deliver flexural strength of 150-200 MPa, tensile elongation of 2-5%, and resistance to a wide range of chemicals including concentrated acids, alkalis, solvents, and oxidizing agents.
Viscosity at 25°C is 300-600 mPa·s, compatible with hand lay-up, spray-up, filament winding, and vacuum infusion. Gel time with 1.5% MEKP/0.5% cobalt is 20-35 minutes. Applications include chemical storage tanks, marine hull barrier coats, corrosion-resistant FRP linings, and infrastructure pipe systems where UPR grades are inadequate.
Specifications
| Parameter | Value |
|---|---|
| Appearance | Clear to pale yellow liquid |
| Resin Type | BPA-based vinyl ester |
| Styrene Content | 35-45% |
| Viscosity (25°C) | 300-600 mPa·s |
| Flexural Strength (cured) | 150-200 MPa |
| Tensile Elongation (cured) | 2-5% |
| Gel Time (25°C, 1.5% MEKP) | 20-35 min |
Applications
FAQ
Vinyl ester has significantly better resistance to: (1) Concentrated acids (e.g., 50% H2SO4, 35% HCl) at ambient temperature; (2) Strong oxidizers (dilute bleach, hydrogen peroxide); (3) Organic solvents (MEK, acetone, some aromatics); (4) Alkaline solutions up to 50% NaOH. The epoxy backbone's ether linkages are more chemically stable than the ester linkages in UPR, making vinyl ester the superior choice whenever aggressive chemical service is involved.
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