FOCUS potential for applying thick protective films in one coat. There have been a number of field trials in the past, particularly for protecting the welded seams of pipelines after the factory precoated lengths of pipe are connected on-site, and for repairing welded sections in chemical plant construction, but the major problem has been to ensure that the applied coating is uniformly cured. Solvent resistant tests on thick coatings have proved to be unreliable as a nondestructive method for assessing cure on these items. The abstracted article in this issue (p 2) offers the possibility that this might be achieved by flame spraying application methods if the process parameters can be optimized by computer simulation techniques. Is there no end to the versatility of powder coatings? Sid Harris
TECHNICAL Thermal spraying of thermoset powder coatings Thermal spraying is a widely used technique for the on-site coating of large components and structures with thermoplastic coatings, but little attention has been given to applying thermoset powder coatings. A team drawn from several London UK universities has now published the results of its recent work, which examines the possibility of thermal spraying of thermosetting powder coatings. If this is possible, then the feedstock particles will have to melt in the flame without degradation, and the coating must be cured by the end of the deposition process. Particle residence time in the flame during deposition is less than 0.01 seconds and thermosetting powder coatings invariably need both high temperatures and residence time 2
ON
POWDER
to achieve satisfactory cure. It is, however, possible that the deposited thermoset coating will receive additional heat from the scanning flame during deposition. Since this would be a variable factor, the researchers have examined the interactions between the flame, coating and the substrate. They used computer simulations aimed at controlling the temperature profiles of the thermosetting powder deposits to ensure that adequate cure can be obtained. They developed computer software to simulate flame scanning and post heat treatment, and they also applied commercial software to simulate steady-state infrared heating. It was found that process parameters have a critical effect on coatings properties and these can be optimized by the use of computer simulations. The thermal conductivity of the polymers is much lower than that of the metal substrates. Epoxy, nylon and steel have thermal conductivities of 0.19, 0.24 and 51.9Wm-1K-1 respectively, which results in slower heat flow from the hot surface and higher temperatures at the surface of the polymer particles during flame application, making it difficult to maintain temperature of the polymer below its decomposition temperature. Another consequence of the thermal gradient within the thermoset polymer is non-uniform curing that would drastically affect film properties. A possible solution could be post heating after application by flame scanning or infrared irradiation. An interesting and well presented paper in which the effect of substrate thickness and heating power were simulated so that the temperature of both coating and substrate can be controlled to provide adequate curing of the thermoset powder coating. Article entitled “Process Modelling of Thermal Spraying for Thermoset Coatings”. Original Source: Progress in Organic Coatings, Feb/Mar 2012, 73 (2-3), 225-231 (Website: http://www.sciencedirect.com) © Elsevier BV 2012
C O AT I N G S
INDUSTRY NEWS BASF’s Coatings Division launches a new website BASF’s Coatings Division has unveiled a redesigned website at www.basfcoatings.com. The userfriendly website provides detailed information on the firm’s paints and coatings. Original Source: Coatings World, Feb 2012, 17 (2), 10 (Website: http://www.coatingsworld.com/) © Rodman Publishing 2012
Ecology Coatings enters into a licence agreement with BASF Coatings GmbH Ecology Coatings Inc has inked a licence agreement with German firm BASF Coatings GmbH. Under the deal, BASF has a nonexclusive licence to use Ecology Coatings’ EP 1 723 180, US 7,323,248, US 7,153,892 and US 7,498,362 patents covering novel UV-curable coatings. In exchange, BASF will give Ecology Coatings a royalty fee of 0.5% of the net sales value of products using EP 1 723 180 sold in Europe, and a royalty fee of 2.5% of the net sales value of products sold outside of Europe. Original Source: Coatings World, Feb 2012, 17 (2), 16 (Website: http://www.coatingsworld.com/) © Rodman Publishing 2012
Cytec announces price increase for powder coating resins in the Americas Cytec Industries Inc and its affiliated companies have announced to customers a selling price increase on all powder coating resins (Crylcoat powder resins, Additol powder resins additives, Modaflow additives and resins and Uvecoat powder resins) sold in North America and Latin America. The increase will be between $0.10/lb- $0.12/lb and will be effective for shipments on MAY 2012
FOCUS or after 1 Apr 2012 or as contracts allow. Cytec Industries Inc’s vision is to deliver speciality chemicals and materials technologies with a focus on innovation. Press release from: Cytec Industries Inc, 5 Garret Mountain Plaza, West Paterson, NJ 07424, USA, tel: +1 973 357 3249 or +1 973 357 3319, e-mail:
[email protected], website: http://www.cytec.com (5 Mar 2012)
Cytec announces price increases on its powder coating resins product range in Europe, the Middle East and Africa Cytec Industries Inc and its affiliated companies have announced to customers a price increase for its entire range of powder coating resins and additives sold in Europe, the Middle East and Africa. The price of all products in the range will be increased by €0.1/kg to €0.12 /kg for shipments from Europe and by $0.13/kg to $0.15/kg for shipments from Asia. The adjustment will be effective for all shipments as of 1 Apr 2012 or as contract terms permit and is in addition to any previously announced price adjustment. Cytec Industries Inc’s vision is to develop technologies with a focus on innovation. Press release from: Cytec Industries Inc, 5 Garret Mountain Plaza, West Paterson, NJ 07424, USA, tel: +1 973 357 3249 or +1 973 357 3319, e-mail:
[email protected], website: http://www.cytec.com (5 Mar 2012)
DSM Coating Resins announces a price increase for its powder coating resins per 15 Mar 2012 for NAFTA region On 9 Mar 2012, DSM Coating Resins announced a price increase for its range of Uralac powder coating resins sold in the NAFTA region. Prices are increased by $0.06/lb to $0.09/lb for its product range, effective for all orders shipped on or after 15 Mar 2012 or as otherwise permitted by the terms and conditions of customer contracts. Prices are being adjusted due to the strong increase in costs for MAY 2012
ON
POWDER
feedstock used in the manufacture of polyester powder coating resins. Press release from: DSM, PO Box 6500, 6401 JH Heerlen, The Netherlands, tel: +31 45 578 2422, fax: +31 45 574 0680, website: http://www.dsm.com (9 Mar 2012)
Kuraray’s resins, an advantage for primers, lacquers and coatings Kuraray Europe GmbH’s Mowital/Pioloform PVA/PVB (polyvinyl alcohol/polyvinyl butyral) resins offer several advantages like good adhesion and high gloss to primers, lacquers and coatings. When used in liquid primers and lacquers, Mowital delivers good adhesion to steel, iron, zinc, aluminium and other light metals after cross-linking and curing. Kuraray developed several Mowital formulations for use in different primer applications. For example, primers featuring Mowital B30HH offers improved corrosion protection against rust compared with water-based primer. In wood applications, Mowital delivers good flexibility and toughness, good barrier against wood ingredients, resistance to moisture and good adhesion. When used in powder coatings, Mowital functions as an additive to support the extrusion process. Mowital also works as a wetting agent to enhance the edge wetting. Original Source: Pitture e Vernici – European Coatings, Mar/Apr 2012, 88 (2), 55-57 (Website: http://www.pittureevernici.it/)
Jotun opens NKR 500 M factory in Sandefjord, Norway Jotun A/S’s new paint production facility at Vindal in Sandefjord, Norway, was officially opened on 16 Mar 2012. The new 13,000 sq m factory will serve the Scandinavian market with as much as 80 M litres/y of paint. The factory represents Jotun’s largest investment to date at a cost of about NKR 500 M. The new factory replaces production at Jotun’s existing facility in Sandefjord and will manufacture all of Jotun’s decorative paints,
C O AT I N G S tinters and fillers for Scandinavia. All production of coatings for industry and shipping will be moved to the company’s facility in Flixborough, England. Employing some 240 people, the new facility will enable important improvements and efficiency gains for Jotun in Norway, including a projected reduction of 80% in carbon dioxide emissions from internal transportation; new production that enables a reduction in use of solvents and use of less hazardous chemicals; waste reduction due to the application of new technology; cleaning and recycling of waste instead of disposal; and projections show a reduction in energy consumption of 50%. Press release from: Jotun A/S, Sandefjord, Norway, tel: +47 33 45 70 00, website: http://www.jotun.com (19 Mar 2012)
Arkema’s Rilsan fine powders exhibit at IE EXPO 2012 International Trade Fair for Water, Sewage, Refuse, Recycling and Energy Conservation, IE EXPO 2012 is the largest environmental technology exhibition in China. Arkema’s Rilsan fine powders will attend IE EXPO 2012 from 7 to 9 Mar 2012 on a joint booth with distributor Wuhan Huipu in the Shanghai New International Expo Centre. Rilsan fine powderscoated carbon steel is a costeffective and technical alternative to stainless steel. It is produced with less energy and carbon dioxide emissions. For more than 40 years, Arkema’s Rilsan highperformance powder coatings have been used in the water industry for coating pipes, pumps, valves and fittings. Manufactured from a renewable resource, Rilsan polyamide is the market’s only engineering bio-plastic for high performance coatings. Rilsan fine powders present following advantages in water industry: Preserves water quality; Protects parts during handling and storage; Excellent durability that lowers maintenance costs; and Resistance to the hardest attack 3