Resins
In use are duroplastic resins which contain sufficient catalysts, UV stabilisers and pigments. Through this mixture, a connection is made to ensure the required mechanical and chemical properties.
Polyester
The unsaturated polyester resins are among the most commonly used resins in composite materials. UP resins are a colourless to slightly yellow solution of unsaturated polyester in a reactive solvent, usually styrene. At room temperature or by supply of heat, they are cured, whereby a heat reaction is released.
| Unsaturated polyester is resistant to: | Properties: | |
|---|---|---|
| • aromatic hydrocarbons | • optical: opaque | |
| • aliphatic hydrocarbons | ||
| • oil | • viscosity: low | |
| • acids | ||
| • saline solutions | • service temperature: -30 to 200°C |
|
| • petrol | ||
| • alcohols | ||
Vinylester
Vinylester resins are produced by reacting epoxides with methacrylic acid. By using vinylester resins as a matrix for GRP Profiles and GRP Gratings a much higher chemical resistance is achieved.
| Vinylester resins are resistant to: | Properties: | ||
|---|---|---|---|
| • aromatic hydrocarbons | • optical: yellow | ||
| • aliphatic hydrocarbons | |||
| • acids | • viscosity: low | ||
| • lyes | |||
| • alcohols | • service temperature: -30 to 180°C |
||
| • grease | |||
| • oil | |||
| • petrol |
Phenolic resins
Phenolic resins are produced by polycondensation of phenol (m-cresol) with methanal (formaldehyde).
Epoxy resin
Epoxy resins are compounds, which have one or more reactive epoxy and hydroxyl groups. In general, they are formed from bispherol A and epichlorohydrin by polyaddition and polycondensation, combined with subsequent curing.
| Epoxy resins are resistant to: | Properties: | ||
|---|---|---|---|
| • aromatic hydrocarbons | • optical: opaque | ||
| • aliphatic hydrocarbons | |||
| • organic solvents | |||
| • petrol | • viscosity: low | ||
| • oil | |||
| • alcohols | |||
| • saline solutions |
• service temperature: -30 to 180°C |
||
| • acids | |||
| • lyes |
Acrylic resin
Acrylic resins are synthetic resins, which are produced by polymerisation of acrylic acid, methyl acid and the corresponding esters.
Acrylic resins play a minor role in the pultrusion process. They are usually employed, just like phenolic resins, in areas where high fire resistance and minimal smoke are required.
| Acrylic resins are not resistant to: | Properties: | ||
|---|---|---|---|
| • solvents | • good burnig properties | ||
| • alcohols | • low smoke emission | ||
| • weather proof | |||
| • optical: opaque |
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