This document will explore the properties, advantages, applications, processing methods, and provide a comprehensive Technical Data Sheet (TDS). Designed to meet the demands of industries such as กระบวนการทางเคมี, ทางทะเล, ยานยนต์, และ infrastructure, paraphthalic resin is the material of choice when longevity and resistance to extreme environments are essential.

2. What is Paraphthalic Unsaturated Polyester Resin?

Paraphthalic UPR is a thermosetting resin derived from terephthalic acid หรือ dimethyl terephthalate (DMT), which is reacted with glycols เช่น propylene glycol หรือ neopentyl glycol และ maleic anhydride. It contains unsaturated double bonds that allow cross-linking with monomers like styrene during curing, forming a three-dimensional network with high structural integrity.

What makes paraphthalic resin unique is its benzene ring structure in the para position, which confers rigidity and thermal resistance. This molecular arrangement makes P-UPR one of the most durable and stable resins available within the unsaturated polyester family.

3. Key Features and Benefits

✅ Outstanding Chemical Resistance

Tolerates prolonged exposure to acids, alkalis, salts, and a variety of organic solvents.

✅ Exceptional Mechanical Properties

High tensile, flexural, and impact strength ideal for structural and load-bearing applications.

✅ Superior Thermal Stability

Heat resistance up to 160°C with special formulations.

✅ Enhanced Weathering Resistance

Performs well under UV radiation, freeze-thaw cycles, and high humidity environments.

✅ อายุการใช้งานยาวนาน

Designed for applications demanding 20+ years of durability.

✅ Excellent Compatibility with Reinforcements

Bonds exceptionally well with glass, aramid, and carbon fiber for high-strength composites.

4. Common Applications

Paraphthalic UPR is used across a wide range of industries that demand high-performance, corrosion-resistant composite materials.

5. Processing Characteristics

Paraphthalic UPR is suitable for various fabrication processes. It is often supplied as a pre-promoted system but may also be modified to suit specific production techniques.

Curing Agents:

Paraphthalic resins cure with MEKP, BPO, หรือ AIBN, often in conjunction with cobalt accelerators.

เจลไทม์:

Adjustable between 8–25 minutes depending on application and catalyst system.

6. เอกสารข้อมูลทางเทคนิค (TDS)

Below is a representative TDS. The actual properties may vary depending on the manufacturer or the specific formulation.

📌 Liquid Resin Properties

🔧 Cured Resin Mechanical Properties

🌡️ Thermal and Chemical Resistance

7. Storage Guidelines

To maintain the shelf life and quality of paraphthalic resin:

• Store in sealed containers between 15–25°C.

• หลีกเลี่ยง direct sunlight, ความชื้น, และ excess heat.

• ใช้ within 6 months of manufacture date.

• Agitate before use to ensure uniformity.

8. Safety Precautions

• Follow MSDS recommendations.

• Keep away from open flames และ แหล่งความร้อน.

• Avoid inhalation of styrene fumes; use in ventilated areas.

• Wear appropriate PPE—gloves, goggles, and a respirator if needed.

• Dispose of unused material in accordance with local regulations.

9. Packaging Options

Paraphthalic UPR is supplied in:

10. Summary and Conclusion

Paraphthalic Unsaturated Polyester Resin stands out as a top-tier resin system for advanced composite applications. Its performance benefits over traditional ortho- and isophthalic resins include:

• Enhanced resistance to corrosive environments.

• Long-term thermal and UV stability.

• Structural reliability in demanding mechanical applications.