⭐ What Is PIA (Isophthalic Acid)?

Isophthalic Acid (PIA) is an aromatic dicarboxylic acid with two carboxyl (–COOH) groups positioned in the meta-configuration on a benzene ring.
With the chemical formula C₈H₆O₄, PIA is a key raw material used in high-performance polyester resins, PET modification, coating resins, and composite systems.

PIA enhances the chemical, thermal, and mechanical performance of polyester-based polymers and coatings.

🔧 What Is PIA Used For?

The primary function of PIA is to improve durability, flexibility, and chemical stability in polyester and resin formulations.

✔ 1. Strengthens Polyester Resins

PIA enhances:

• Chemical resistance
• UV stability
• Thermal stability
• Mechanical strength

in polyester materials.

✔ 2. Used for PET Modification

When incorporated into PET, PIA improves:

• Impact resistance
• Flexibility
• Clarity
  and helps prevent bottle paneling (shrink deformation).

✔ 3. Enhances Coating Resin Performance

PIA-based resins provide:

• Harder film formation
• Better adhesion
• Improved scratch and chemical resistance

✔ 4. Improves Epoxy & Alkyd Resin Structure

Creates stronger, longer-lasting resin networks.

🎯 Purposes of PIA

✔ 1. High-Performance Polyester Resin Production

Used in:

• Saturated polyester resins
• Unsaturated polyester resins (UPR)
• Powder coating polyester resins

✔ 2. PET Modification

For manufacturing:

• Impact-resistant PET
• High-clarity PET
• Heat-resistant PET bottles & packaging

✔ 3. Paints & Coatings

Used in:

• Industrial coatings
• Automotive coatings
• Heat-resistant coatings
• Protective surface coatings

✔ 4. Composite Manufacturing

Improves chemical and mechanical resistance in UPR-based composite systems.

✔ 5. Fiber & Film Production

Used in:

• Polyester fibers
• Technical films
• High-strength plastic films

🏭 Industries That Use PIA

• Plastic & PET production
• Paint & coating industry
• Composite manufacturing
• Automotive sector
• Construction
• Electrical & electronic resins
• Fiber & textile industry

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