How is Polyester Resin Produced | What is Orthophthalic Polyester Resin?

How is Polyester Resin Produced?

Polyester resins are produced through the polyesterification reaction of multifunctional acids (dicarboxylic acids) and multifunctional alcohols (glycols). In this reaction, acid and alcohol molecules combine to form ester bonds, creating long-chain polymers.

Production Process:

Raw Material Preparation: Dicarboxylic acids and glycols are mixed in specific proportions.
Condensation: The mixture is heated to high temperatures in the presence of a catalyst to remove water.
Polymerization: After condensation, the resin is cooled, and the polymerization reaction continues until the desired viscosity is reached.
Finishing: Additives and colorants can be added to the resin to achieve the desired final properties.

What is Orthophthalic Polyester Resin?

Orthophthalic polyester resins are a versatile type of plastic with a wide range of applications, known for their chemical and mechanical properties. They are produced by reacting orthophthalic acids, such as maleic anhydride and phthalic anhydride, with glycols. Orthophthalic polyester resins are the most commonly used type of polyester resin.

Properties:

Readily available and economical
Good mechanical and chemical resistance
Resistant to water and many chemicals
High strength and hardness
Good processability
Wide range of applications

Applications:

Composite material production
Boat and shipbuilding
Automotive and aerospace industries
Electrical and electronics sectors
Construction and building materials
Coatings and paints industry

Summary:

Polyester resins are an important type of plastic with versatile properties and a wide range of applications. Orthophthalic polyester resins are the most commonly used type due to their easy accessibility, affordability, and good mechanical and chemical resistance.