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Unsaturated Polyester Resins
(UPR) is a blend of unsaturated polyester in a reactive monomer, usually
styrene. Being a viscous liquid, UPR can be implemented with a wide
range of technologies and shaped in the form of objects of almost any
dimension, from buttons to boat hulls.
Organic peroxides are used to cure resins by enabling
synthesis of reactive monomer chains linking unsaturated sites of the
polyester.
This process provides the desired mechanical
properties to achieve the form and appearance of the final product.
There are two main processes to accomplish this:
- Cold process - the organic peroxide reacts in the
presence of cobalt salts or organic amines at room temperature
- Hot process - the organic peroxide is thermally
activated
These processes allow UPR to be:
- Used pure for the production of transparent and
glossy objects
- Combined with fillers (Silica, CaCO3) and
pigments for the production of synthetic marble and concrete
- Reinforced with glass fiber or glass fiber mats
and shaped in a wide variety of mechanically resistant objects
End Product:
- Good mechanical performance: hardness, resistance
to water and flexure
- Homogenous and glossy appearance (gel coating)
- Tighter dimensional tolerances (less trim)
Luperox® organic peroxides cover all customer
requirements in reactivity both in cold and hot curing.
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