Unsaturated polyester resin (general knowledge)

Unsaturated polyester resin
Characteristics
• Excellent mechanical properties, particularly glass fiber reinforced polyester, which has outstanding impact resistance.
• High heat resistance.
• Superior electrical properties (has performance intermediate between phenolic resins and polystyrene).
• Excellent chemical resistance, water resistance, and solvent resistance.
• Weak resistance to strong acids and strong alkalis, which can cause degradation.
Chemical resistance
Chemical-resistant type
Manufacturing method
• Consists of two processes: the production of unsaturated acid polyester (alkyd) and the mixing with a monomer that acts as a crosslinking agent for this alkyd.
• A typical formulation example is to produce alkyd using 1.01 moles of propylene glycol, 0.5 moles of maleic anhydride, and 0.5 moles of phthalic anhydride.
• After the reaction is complete, a polymerization inhibitor is added, and the mixture is transferred to a dissolution tank, where a specified amount of styrene is added to produce the final product.
Applications
• Cosmetic boards
• Buttons
• Paints (heavy-duty anti-corrosive paints)
• Molded products (bathtubs, small boats, purification tanks, tanks, bathroom units)


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