Isophthalic Unsaturated Polyester Resin

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Isophthalic Unsaturated Polyester Resin
Isophthalic Unsaturated Polyester Resin

Isophthalic Unsaturated Polyester Resin (commonly abbreviated as isophthalic UPR) is a high-performance thermosetting resin widely used in the production of fiberglass reinforced plastics (FRP). Known for its excellent chemical resistance, enhanced mechanical properties, e superior thermal stability, it represents a significant upgrade from general-purpose o-phthalic resins. This document provides a comprehensive overview of isophthalic resin, including its propriedades, formulários, processing techniques, and a detailed Technical Data Sheet (TDS).

Introdução ao desempenho do produto

2. What is Isophthalic Unsaturated Polyester Resin?

Isophthalic resin is a type of unsaturated polyester resin synthesized by the condensation polymerization de isophthalic acid (IPA) or its anhydride, with glycols such as propylene glycol or diethylene glycol, and maleic anhydride. The unsaturated double bonds in the molecular chain make it curable by free radical polymerization, typically through initiators such as MEKP (methyl ethyl ketone peroxide).

This resin features a linear structure with pendant vinyl groups, making it compatible with cross-linking agents like styrene monomer. Compared with o-phthalic resin, isophthalic UPR offers higher resistance to chemicals, increased durability, e greater tensile strength.

3. Key Features and Advantages

✅ Superior Chemical Resistance

Suitable for applications involving acids, alkalis, and moderate solvents.
✅ High Mechanical Strength

Enhanced flexural, tensile, and impact strength make it ideal for load-bearing FRP components.
✅ Excellent Thermal Stability

Capable of withstanding higher service temperatures (up to 120°C depending on formulation).
✅ Improved Weatherability

Withstands UV exposure, water ingress, and thermal cycling better than standard resins.
✅ Good Adhesion to Reinforcements

Works well with glass fiber, carbon fiber, and other synthetic reinforcements.
✅ Longer Service Life

Durable in demanding environments such as marine, industrial, and outdoor applications.

4. Common Applications

Thanks to its enhanced performance profile, isophthalic UPR is used in many demanding structural and corrosion-resistant FRP products:

✔️ Industrial and Chemical Equipment

Tanks
Scrubbers
Pipes
Ducts
Fume hoods

✔️ Marítimo e Offshore

Boat hulls
Decks
Marine panels
Jet ski and kayak components

✔️ Construção

Gratings
Pultruded profiles
Manhole covers
Rebar and wall panels

✔️ Transporte

Automotive body parts
Truck panels
RV exteriors

✔️ Consumer and Utility Products

Bathtubs and sinks
Shower trays
Chemical-resistant countertops

5. Processing Methods

Isophthalic resins are suitable for a wide range of processing techniques:

Method	Suitability
Hand lay-up	Excelente
Spray-up	Excelente
Filament winding	Excelente
Pultrusion	Very good
Compression molding	Bom
Resin transfer molding	Acceptable with modified resin

Curing Agents:

Typically cured with MEKP ou BPO (benzoyl peroxide) in combination with cobalt accelerators e promoters.

Tempo de gel:

Adjustable depending on formulation and catalyst system, typically 8–30 minutes at ambient temperature.

6. Technical Data Sheet (TDS)

Below is a sample TDS for Isophthalic Unsaturated Polyester Resin. Actual values may vary slightly depending on formulation and manufacturer.

📌 General Properties

Propriedade	Typical Value	Método de teste
Appearance	Clear to pale yellow liquid	Visual
Viscosity @ 25°C (mPa·s)	400 – 650	Brookfield LV, #3/60rpm
Acid Number (mg KOH/g)	15 – 25	ISO 2114
Solid Content (%)	60 – 70	ISO 3251
Monomer Content (Styrene %)	30 – 40	GC Method
Gel Time @ 25°C (3 phr MEKP)	12 – 18 minutes	ISO 2535
Shelf Life	6 months @ ≤ 25°C	—

🔧 Mechanical Properties (Cured Resin)

Propriedade	Typical Value	Método de teste
Tensile Strength (MPa)	60 – 80	ISO 527
Tensile Modulus (GPa)	3.0 – 3.5	ISO 527
Elongation at Break (%)	2.0 – 3.5	ISO 527
Flexural Strength (MPa)	100 – 120	ISO 178
Flexural Modulus (GPa)	3.5 – 4.2	ISO 178
Izod Impact Strength (kJ/m²)	6 – 10	ISO 180
Dureza Barcol	35 – 45	ASTM D2583

🌡️ Thermal and Chemical Resistance

Propriedade	Typical Value	Método de teste
Heat Deflection Temp (HDT °C)	80 – 120	ISO 75
Water Absorption (%)	< 0.3	ISO 62
Thermal Conductivity (W/m·K)	~0.2	ISO 22007
Flammability	Self-extinguishing (with filler)	UL94
Resistência química	Excellent to acids & saltwater	In-house test

7. Storage and Handling

Store in original, sealed containers in a cool, dry, and shaded area.
Avoid direct sunlight and keep away from open flames or ignition sources.
Use proper PPE including gloves, goggles, and a respirator if necessary.
Ensure good ventilation during use.
Observe standard fire safety procedures—unsaturated polyester resins are flammable.

8. Safety Information

Refer to the Material Safety Data Sheet (MSDS) before handling.
Vapors may cause respiratory irritation—use in well-ventilated areas.
Avoid contact with skin and eyes.
Use explosion-proof equipment in storage and mixing areas.

9. Packaging Options

Isophthalic UPR is commonly available in the following packaging formats:

Packaging Type	Peso
Metal Drums	220–240 kg
IBC Totes	1000 kg
Bulk ISO Tank	≥ 20,000 kg

10. Conclusion

Isophthalic Unsaturated Polyester Resin offers a perfect balance between performance and cost for a wide range of composite applications. Its enhanced strength, chemical durability, e resistance to weathering and thermal degradation make it the ideal choice for customers seeking more than just a general-purpose resin.

Whether you're building chemical tanks, marine decks, corrosion-resistant ductwork, or high-strength FRP panels, isophthalic UPR delivers long-term performance, reliability, and value.

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Perguntas frequentes

P: What are the main applications of o-Phthalic Unsaturated Polyester Resin? A : o-Phthalic UPR is widely used in general-purpose fiberglass-reinforced plastic (FRP) applications such as gratings, tanks, bathtubs, pipes, panels, and decorative components. It is especially suited for environments requiring moderate mechanical strength and cost-efficiency, but not intended for aggressive chemical or high-temperature conditions.
P: How does it compare to isophthalic and vinyl ester resins? A : Cost: o-Phthalic is more economical. Performance: It has lower chemical and thermal resistance compared to isophthalic or vinyl ester resins. Usage: Choose o-Phthalic for general use, isophthalic for stronger corrosion/thermal needs, and vinyl ester for high-performance or corrosive environments.
P: How do I store and handle o-Phthalic resin safely? A : Store in cool (5–25°C), dry, well-ventilated areas. Keep away from heat, ignition sources, and sunlight. Use sealed containers, ideally nitrogen-blanketed. Always wear protective gloves, goggles, and use fume extraction when handling. Follow your supplier's MSDS for detailed safety procedures.
P: Can o-Phthalic resin be pigmented or filled? A : Yes. o-Phthalic resin is compatible with polyester-compatible pigments and fillers (e.g., calcium carbonate, ATH). Add pigments and fillers before mixing in the curing agents. Keep the viscosity in check if adding fillers to avoid poor wet-out of reinforcements.
P: How long is the shelf life of o-Phthalic resin, and how can it be extended? A : Typical shelf life is 3 to 6 months when stored in ideal conditions (below 25°C in a sealed container). To extend shelf life: Ensure resin is stabilized with hydroquinone or MEHQ inhibitors. Store in dark, cool environments. Avoid frequent opening of containers to limit oxygen and moisture exposure.

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