Description
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 then 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 :
These processes allow UPR to be :
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Used pure for the production of transparent and glossy objects
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Combined with fillers (Silica, CaCO3) and pigments for the production of synthetic marble and concrete
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Reinforced with glass fiber or glass fiber mats and shaped in a wide variety of mechanically resistant objects
Benefits
End Product :
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Good mechanical performance: hardness, resistance to water and flexure
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Homogenous and glossy appearance (gel coating)
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Tighter dimensional tolerances (less trim)
Luperox® organic peroxides cover all customer requirements in reactivity both in cold and hot curing.
Market and applications
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Transportation : boats, car body panels, trucks
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Leisure : swimming pools, hot tubs
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Household equipment : small electric appliances
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Construction : pipes
The main families of organic peroxides used for curing unsaturated polyester are :
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Ketone peroxides, which are generally used at room or mid temperature in combination with Cobalt salts.
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Diacylperoxides, which like Benzoyl peroxide can be used at room temperature, activated by tertiary aromatic amines, or without promoter at higher temperature (100°C/212°F).
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Peresters and Perketals, which are used at higher temperatures and are preferred in injection and compression molding processes.
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Hydroperoxides, which are used at higher temperatures in injection and compression molding processes.
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