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Minehunter fuels new resin development
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Minehunter fuels riew resin development
The water resistant, high elongation polyester resins developed for use in tbts Norwegian M(.MV can also offer benefits in otber composites applications, says fotun Polymer.
A HIGHLY water resistant polyester resin developed for the new generation of Royal Norwegian Navy mine counter measures vessels (MCMV) also of• fers benefits in a range of other composites applica• tions, says manufacturer Jotun Polymer. The Norpol 20M-80 iso NPG low styrene emission polyester (part of the 20-00 range) com• bines high tensile elonga• tion with its water resistance. This makes it ideal for use on the inner skin of the sandwich hulls of the catamarans, as well as for decking and all other laminates. The hull outer skins are made from jotun's 92-40 rubber mod• ified vinyl ester. The ships are fabri• cated using an Aplicator roller machine to apply the Norpol resin to multi• axial glass fibre from De• void AMT AS . The sandwich material be• tween the two hull skins
Reinforced Plastics October 1995
is Divinycell H-60-H-250, impregnated with Norpol 92-80. jotun says that in addi • tion to an exceptionally high degree of water-re• sistance the Norpol 20-00 series of resin has unu• sually good tensile elonga• tion properties . This combination gives Norpol 20-00 the benefits of Vinyl ester and epoxy grades with the low cost and ease of application of a polyester, says jotun. As part of its develop• ment for the MCMVs Norpol 20-00 underwent standardized static and dynamic tests, as well as burst tests under the di• rection of the Royal Nor• wegian Navy. In tests carried out by jotun Nor• pol 20-00 absorbed just 55 mg of water/per test piece after 28 days immer• sion compared with 60 mg for standard vinyl ester, 80 mg for advanced isophthalic polyester and 90 mg for standard
orthophthalic polyester. Tensile elongation for the 20-00 was tl.5'X, compared with 5'](, for the standard vinyl ester, 3.5% for the advanced isophthalic polyester and 1.5% for the standard orthophtha• lie polyester. The minesweepers and sleds tested under the harshest polar conditions represent two of the most extreme applications for Norpol 20-00, but accord• ing to jotun the cornbina• tion of high elongation and low water-resistance at reasonable cost make the resin suitable for ap• plications such as con• struction, exterior com• ponents on high speed trains, windmill blades and transport containers. Norpol 20-00 is avail• able in a range of variants to suit specific needs, says jotun, and can be supplied as a low styrene emission resin. ]otun Polymer AS ; tel: + 4 7-34- 5 7000.
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Exaton extends products EXATON Composites (pty) Ltd, a supplier of composite materials and technology in South Afri• ca, has recently an• nounced the addition of further products to its portfolio. It is now distributing West System brand epoxies and the new Pro• set high performance fibre reinforced plastic (FRP) epoxies. New reinforce• ments include Cotech non-crimp stitched fabrics from Tech Textiles Inter• national and Flexicore end• grain balsa wood. Tygavac vacuum bagging materials from Courtaulds Aero• space and Technical Fibre Products' range of special high-performance compo, site tissues are further additions. Graham Blyth, Direc• tor, Exaton Composites (pty) ltd; tel: + 27-21• 5/0-2564/62; fax: + 27• 2/-5/()"5497.
Maleated PP strengthens wood FRP
HOW TO improve the mechanical properties of wood fibre reinforced polypropylene (PP) com• posites has been exam• ined by researchers from Louisiana State University, in Baton Rouge, USA A paper from MinqUi Lu, J.R. Collier and B.J. Collier examining the use of compounding and in• line maleation concludes that maleated PP is a very effective coupling agent for PP-wood fibre. Only a small amount of maleatcd PP can significantly im• prove the tensile proper• ties , reports Plastics News.
Minehunter fuels riew resin development
The water resistant, high elongation polyester resins developed for use in tbts Norwegian M(.MV can also offer benefits in otber composites applications, says fotun Polymer.
A HIGHLY water resistant polyester resin developed for the new generation of Royal Norwegian Navy mine counter measures vessels (MCMV) also of• fers benefits in a range of other composites applica• tions, says manufacturer Jotun Polymer. The Norpol 20M-80 iso NPG low styrene emission polyester (part of the 20-00 range) com• bines high tensile elonga• tion with its water resistance. This makes it ideal for use on the inner skin of the sandwich hulls of the catamarans, as well as for decking and all other laminates. The hull outer skins are made from jotun's 92-40 rubber mod• ified vinyl ester. The ships are fabri• cated using an Aplicator roller machine to apply the Norpol resin to multi• axial glass fibre from De• void AMT AS . The sandwich material be• tween the two hull skins
Reinforced Plastics October 1995
is Divinycell H-60-H-250, impregnated with Norpol 92-80. jotun says that in addi • tion to an exceptionally high degree of water-re• sistance the Norpol 20-00 series of resin has unu• sually good tensile elonga• tion properties . This combination gives Norpol 20-00 the benefits of Vinyl ester and epoxy grades with the low cost and ease of application of a polyester, says jotun. As part of its develop• ment for the MCMVs Norpol 20-00 underwent standardized static and dynamic tests, as well as burst tests under the di• rection of the Royal Nor• wegian Navy. In tests carried out by jotun Nor• pol 20-00 absorbed just 55 mg of water/per test piece after 28 days immer• sion compared with 60 mg for standard vinyl ester, 80 mg for advanced isophthalic polyester and 90 mg for standard
orthophthalic polyester. Tensile elongation for the 20-00 was tl.5'X, compared with 5'](, for the standard vinyl ester, 3.5% for the advanced isophthalic polyester and 1.5% for the standard orthophtha• lie polyester. The minesweepers and sleds tested under the harshest polar conditions represent two of the most extreme applications for Norpol 20-00, but accord• ing to jotun the cornbina• tion of high elongation and low water-resistance at reasonable cost make the resin suitable for ap• plications such as con• struction, exterior com• ponents on high speed trains, windmill blades and transport containers. Norpol 20-00 is avail• able in a range of variants to suit specific needs, says jotun, and can be supplied as a low styrene emission resin. ]otun Polymer AS ; tel: + 4 7-34- 5 7000.
•
Exaton extends products EXATON Composites (pty) Ltd, a supplier of composite materials and technology in South Afri• ca, has recently an• nounced the addition of further products to its portfolio. It is now distributing West System brand epoxies and the new Pro• set high performance fibre reinforced plastic (FRP) epoxies. New reinforce• ments include Cotech non-crimp stitched fabrics from Tech Textiles Inter• national and Flexicore end• grain balsa wood. Tygavac vacuum bagging materials from Courtaulds Aero• space and Technical Fibre Products' range of special high-performance compo, site tissues are further additions. Graham Blyth, Direc• tor, Exaton Composites (pty) ltd; tel: + 27-21• 5/0-2564/62; fax: + 27• 2/-5/()"5497.
Maleated PP strengthens wood FRP
HOW TO improve the mechanical properties of wood fibre reinforced polypropylene (PP) com• posites has been exam• ined by researchers from Louisiana State University, in Baton Rouge, USA A paper from MinqUi Lu, J.R. Collier and B.J. Collier examining the use of compounding and in• line maleation concludes that maleated PP is a very effective coupling agent for PP-wood fibre. Only a small amount of maleatcd PP can significantly im• prove the tensile proper• ties , reports Plastics News.