The most common resins that are used in the pultrusion manufacturing process of FRP profiles are special duroplastic resins, which contain adequate catalysts, uv-stabilizers and pigments to get a matrix, which meets the required mechanical and chemical properties.
Polyester
The unsaturated Polyester resins have become the most popular resins for FRP applications during the last years. They are colorless to light yellow solutions of UP in a reactive solvent, in general styrene, which are cured under heat treatment. The reaction of UP is exothemic.
Unsaturated polyester is resistant to:
- aromatic hydrocarbons
- aliphatic hydrocarbons
- oil and petrol
- acids
- saline solutions
- alcohols
Properties
Optical: opaque
Viscosity: low
Service temperature: -30 to 130°C
Vinyl ester
Vinyl ester resins are produced by conversion of epoxy with methacrylic acid.
The use of vinyl ester resins for FRP profiles and gratings provides a high resistance to chemical attacks.
Vinyl ester resins are resistant to:
- aromatic hydrocarbons
- aliphatic hydrocarbons
- acids
- lyes
- alcohols
- grease
- oil and petrol
Properties
Optical:yellow
Viscosity:low
Service temperature: -30 to 150°C
Epoxy resin
Epoxy resins are compunds, which have one or more reactive epoxy or hydroxyl groups. As a rule they originate from bisphenol A ans epichlorhydrine by a combination of polyaddition and polycondensation with a followed curing process.
Epoxy resins are resistant to:
- aromatic hydrocarbons
- aliphatic hydrocarbons
- organic solvents
- oil and petrol
- alcohols
- saline solutions
- acids
- lye
Properties
Optical:opaque
Viscosity:low
Service temperature: -30 to 180°C
Acrylic resin
Acrylic resins are produced by ploymerisation of acrylic acid, methylic acid and the pertinent esters.
Acrylic resins are used in areas in which a high resistant to fire and a low smoke emission is requested.
and they are not so commonly used in the pultrusion process.
Acrylic resins are resistant to solvents and alcohols.
Properties
good burnig properties
low smoke emission
weather proof
optical: opaque
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