pigment manufacturer benda-lutz celebrates 100-year anniversary
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2 JANUARY 2011
F O C U S O N P O W D E R C O A T I N G S
radiation curable powder coatings.The market potential for theseproducts is the only major growtharea. They are proving their valuein many new marketopportunities. A kick-start is allthat is needed to firmly establishthem.
The leading powder coatingsproducers continue to expandtheir production capacities in themain global regions whereexpansion is still progressive.Akzo Nobel has targetedexpansion in China, while Jotunis targeting specific marketopportunities. Its latest launch isa furniture powder coatings range,Era-Coat MDF. These productsinclude an engineered primer andtopcoat, available in 20 coloursand textures. Formulated to givea seamless coated surface,coating both back and front of theMDF, the products are claimed tooffer scratch resistance, water,stain and impact resistance. Jotunis certainly backing powdercoatings as an essential item inits wide range of conventionaldecorative and functionalcoatings.
In Europe and North Americathe situation is still relatively staticalthough demand is animprovement upon the 2009sales. A recent industry reportpredicted a growth rate of about2.7% between 2009 and 2012although there is more interestbeing shown in the architecturalmarket, which has always beensmall in relation to the significantrole of these powder coatings inother global markets. There islittle doubt that the major criticismof powder coatings is their highcuring temperatures. An inevitabledecline of thermosetting powdercoatings will occur in the troubledindustrial climate of the US, withthe development of wet-on-wetprocesses, which offer increasedefficiency and cost reduction.While they still retain theadvantage of being the only trulygreen technology, there is nofuture for thermosetting powdercoatings. The one bright spot isthe steady growth in the US
market of UV curable powdercoatings. This new technologywas first commercialized in theUS and I predict that the positiveadvantages shown by thesesystems will revitalize the USpowder coatings market in thenear future, leaving other globalmarkets a challenge to their ownintegrity.
Sid Harris
TECHNICALImproving adhesion of powdercoatings to aluminium substrates
The most important properties ofa protective coating are: anti-corrosive action and adhesion tothe substrate. The usual methodemployed to improve adhesion onmetal substrates is surface pre-treatment prior to application ofthe coating. A team ofresearchers at the University ofBelgrade has examined theadhesion of polyester powders ondifferently pre-treated aluminiumsurfaces by anodizing, with andwithout sealing, by phosphatingand by silane film deposition.They measured dry and wetadhesion and it was shown thatunder dry conditions all polyesterpowder coatings showed verygood adhesion but the silanetreatment gave superior adhesion.In wet adhesion testing, thealuminium surfaces pre-treated bya silane film maintained superiorperformance over all other pre-treatments. The highest loss ofadhesion was shown byphosphate pre-treatment. Silanecoatings are easy to apply, theyhave good barrier properties, areenvironmentally friendly, and theyare a good substitute for theefficient, but toxic chromate metalpre-treatments.
The paper describes acomprehensive testing procedureinvolving: measurement ofadhesion on differently pre-treatedaluminium panels by twomethods, direct pull-off
procedures and determination ofthe NMPRT (N-methyl-2-pyrrolidone retention time), andelectrochemical impedancespectroscopy. It was also foundthat phosphate pre-treatmentformed stronger adhesive bondswith aluminium, but the system isnot stable in a corrosiveenvironment.
Article entitled “The Influence of AluminiumSurface Pre-treatment on the CorrosionStability and Adhesion of Powder PolyesterCoating” by researchers at University ofBelgrade, published in Progress In OrganicCoatings, Dec 2010, 69 (I4), 316-325
INDUSTRYNEWS
Pigment manufacturer Benda-Lutzcelebrates 100-year anniversary
Austrian company Benda-LutzWerke GmbH celebrated its 100-year anniversary in 2010. Theinternationally active companymanufactures pigments forcoatings, printing inks andplastics, and specialises in themanufacture of metal powders,metal pastes and metal pigmentsas well as the finishing of powdercoatings. Benda-Lutz operatessubsidiaries in the US, Russiaand Poland.
Farbe und Lack, Nov 2010, 116 (11), 14 (inGerman)
SmartSilver introduction
IFS Coatings will useNanoHorizons’ SmartSilver anti-microbial additives for its rangeof antimicrobial powder coatings.IFS and NanoHorizons workedtogether to ensure that IFSPowder Coatings withSmartSilver will deliver durableand long lasting anti-microbialbenefits. IFS Powder Coatingswith SmartSilver are claimed tooffer more than three times theQUV performance than that ofrival technologies.
PPCJ, Polymers, Paint, Colour Journal, Oct2010, 200 (4553), 36