Unsaturated Polyester Resin

Unsaturated polyester resin (UPR) is the most commonly used thermosetting resin. It is a resin solution with a certain viscosity formed by diluting cross-linking monomers or active solvents.

unsaturated polyester resin

Unsaturated Polyester Resin Characteristic

1. Unsaturated Properties

Unsaturated polyester resin contains unsaturated double bonds, which allows it to harden through cross-linking reactions to form a three-dimensional network structure.

2. Curability

By reacting with a curing agent (usually a peroxide substance), unsaturated polyester resin can be hardened to form a strong material.

3. Good Mechanical Properties

Unsaturated polyester resin has excellent mechanical properties after hardening, including strength, elastic modulus, wear resistance, etc.

4. Transparency

Unsaturated polyester resins generally have good transparency after curing, making them suitable for applications requiring transparent or translucent properties.

5. Chemical Resistance

Unsaturated polyester resin has good stability to many chemicals and can resist corrosive substances such as acids and alkalis.

6. Degree of Freedom in Molding

In the liquid state, unsaturated polyester resin has good fluidity and can flexibly adapt to various molding processes, such as spraying, dipping and molding.

7. Weather Resistance

Unsaturated polyester resin usually shows good weather resistance and can maintain stability in outdoor environments for a long time.

8. Adhesion

Unsaturated polyester resin adheres well to a variety of surfaces, including fiberglass, metal and other substrates.

9. Low Shrinkage

During the curing process, unsaturated polyester resin usually exhibits a low shrinkage rate, which helps to reduce the internal stress of the product.