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LETTING IN THE LIGHT
Self-cleaning solar panel coating optimizes energy collection, reduces costs
Soiling -- the accumulation of dust and sand -- on solar power reflectors and photovoltaic cells is one of the main efficiency drags for solar power plants, capable of reducing reflectivity up to 50 percent in 14 days. Though plants can perform manual cleaning and brushing with deionized water and detergent, this labor-intensive routine significantly raises operating and maintenance costs (O&M), which is reflected in the cost of solar energy for consumers.
Under the sponsorship of the Department of Energy’s Energy Efficiency and Renewable Energy SunShot Concentrating Solar Power Program, Oak Ridge National Laboratory is developing a low-cost, transparent, anti-soiling (or self-cleaning) coating for solar reflectors to optimize energy efficiency while lowering O&M costs and avoiding negative environmental impacts.
The coating—which is being designed by members of the Energy and Transportation Science Division, including Scott Hunter, Bart Smith, George Polyzos, and Daniel Schaeffer—is based on a superhydrophobic coating technology developed at ORNL that has been shown to effectively repel water, viscous liquids, and most solid particles. Unlike other superhydrophobic approaches that employ high-cost vacuum deposition and chemical etching to nano-engineer desired surfaces, ORNL’s coatings are deposited by conventional painting and spraying methods using a mixture of organics and particles. In addition to being low-cost, these methods can be deployed easily in the field during repairs and retro-fitting.<more>
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Berger Paints commissions new plant in AP
Berger Paints India Ltd on Friday commissioned a new plant in Hindupur, Andhra Pradesh, with an initial capacity to make 80,000 tonnes paints a year. The company will invest around 550 crore in the project which will see the annual capacity go up to 3,20,000 tonnes in two phases.
The paint-maker and its partners are planning to set up more units in the area and make it an integrated paints complex, with ancillary units joining them.
The plant was inaugurated from Hyderabad by Andhra Pradesh Chief Minister N Kiran Kumar Reddy. The fully-automated and robot-assisted unit will help in meeting the growing demand for paint in the southern parts of the country.
“We are also in the process of setting up a unit for British Paints, another unit for the joint venture with Japanese company NBC (Nippon Bee Chemicals Co Ltd), a container manufacturing unit and other ancillaries, making it a fully integrated paints complex,” said Abhijit Roy, Managing Director and CEO, Berger Paints.
The venture with Japanese company, BNB Coatings India Ltd, makes paints for the automotive sector and supplies to companies such as Toyota Motor Corp. The Hindupur project will provide employment to about 400 people directly and to 1,500-2,000 people indirectly. Kuldip Singh Dhingra, Chairman, said the company now has 10 plants and continues to expand its presence into new segments. The commissioning of this water-based paints plant will help reach out to new markets in the region.
Berger Paints is set to raise prices of its decorative range of products by about 2.2 per cent with effect from February 1. This is the third hike brought about by the company during the current fiscal, taking the increase to about 4.8-5 per cent, CEO Roy said.<more>
Nordson Corporation Declares Second Quarter Dividend for Fiscal Year 2014
WESTLAKE, Ohio, Feb 11, 2014 -- Nordson Corporation today announced that its board of directors declared a second quarter 2014 cash dividend in the amount of $0.18 per common share, payable on March 11, 2014 to shareholders of record as of the close of business on February 25, 2014.
Nordson engineers, manufactures and markets differentiated products and systems used for dispensing and processing adhesives , coatings , plastics , sealants and biomaterials , with related technologies for managing fluids , testing and inspecting for quality, and treating surfaces . These products are supported with extensive application expertise and direct global sales and service. The company serves a wide variety of consumer non-durable, durable and technology end markets including packaging, nonwovens, electronics, medical, appliances, energy, transportation, construction, and general product assembly and finishing. Founded in 1954 and headquartered in Westlake, Ohio, the company has operations and support offices in more than 30 countries
Global and China Epoxy Resin Industry Report, 2013-2016
Epoxy resin is a macro molecular compound containing two or more epoxy groups, mainly used in paint, electronics, composite materials and other fields.
In 2012, the global output of epoxy resin (bisphenol A epoxy resin accounted for about 80% -95%) hit about 2.41 million tons, above 90% of which was contributed by Asia, Western Europe and the United States. In recent years, the epoxy resin market in Europe and the United States has tended to be saturated, while the new capacities have been mainly concentrated in the Asian regions, particularly in China.
China is currently the world's largest producer of epoxy resin, sharing approximately 37.1% of the global output. In 2012, the sluggish Chinese epoxy resin market was featured with surplus low-end products, insufficient supply of high-end products and low operating rate (45.9%) of epoxy resin plants. In the next few years, China will improve the capacity of high-end epoxy resin, so as to reduce its dependence on imports.<more>
JOTUN PAINTS SUPPORTS NACA CENTRE
In an effort aimed at extending a helping hand to the children afflicted with cancer, Jotun Paints recently supported National Association for Cancer Awareness (NACA)’s Dar al Hanan Centre for the third year in a row 2011 – 2013.
Dar al Hanan (meaning 'home away from home'), is an initiative of NACA. Dar al Hanan serves as a temporary home for children from outside Muscat governorate undergoing outpatient treatment for cancer, and their families. The home offers free meals and lodging for patients and their families also provide a free shuttle service to and from The Royal Hospital for its occupants.
Akzo Nobel standalone Dec '13 sales at Rs 656.30 crore
Akzo Nobel standalone Dec '13 sales at Rs 656.30 crore Akzo Nobel India has reported a sales standalone turnover of Rs 656.30 crore and a net profit of Rs 27.01 crore for the quarter ended Dec
Akzo Nobel India has reported a standalone sales turnover of Rs 656.30 crore and a net profit of Rs 27.01 crore for the quarter ended Dec '13. Other income for the quarter was Rs 4.32 crore. For the quarter ended Dec 2012 the standalone sales turnover was Rs 605.16 crore and net profit was Rs 50.63 crore, and other income Rs 24.12 crore.<more>
Kansai Nerolac standalone Dec '13 sales at Rs 824.10 crore
Kansai Nerolac Paints has reported a sales standalone turnover of Rs 824.10 crore and a net profit of Rs 49.10 crore for the quarter ended Dec '13. Kansai Nerolac Paints has reported a standalone sales turnover of Rs 824.10 crore and a net profit of Rs 49.10 crore for the quarter ended Dec '13. Other income for the quarter was Rs 2.80 crore. For the quarter ended Dec 2012 the standalone sales turnover was Rs 766.60 crore and net profit was Rs 48.90 crore, and other income Rs 2.80 crore.
PPG earns DOE funding to develop dynamically responsive IR window coating
Technology aims to maintain daylighting, control solar heat gain - PPG Industries’ (NYSE:PPG) flat glass business has received $312,000 from the U.S. Department of Energy (DOE) to develop a dynamically responsive infrared (IR) window coating that will block heat in the summer to reduce air-conditioning costs and transmit solar heat in the winter to reduce heating costs.
The funding is part of an award of up to $750,000 being shared with project leader Pacific Northwest National Laboratory (PNNL). PPG and PNNL are designing a coating that can “switch” from a solar IR-reflecting state to a solar IR-transmitting state while maintaining high levels of daylight transmittance in either condition. PPG will provide an additional $78,000 in cost-sharing.
The development of such a coating would represent a major advance compared to current thermochromic window technology, which involves coatings that darken and block visible light when exposed to high volumes of IR energy, and existing electrochromic window technology, which relies on external power sources such as electricity to balance tinting and light transmittance.<more>
Chameleon of the sea" reveals its secrets
CUTTLEFISH MAY OFFER MODEL FOR BIOINSPIRED HUMAN CAMOUFLAGE AND COLOR-CHANGING PRODUCTS
Cambridge, Mass. – January 28, 2014 – Scientists at Harvard University and the Marine Biological Laboratory (MBL) hope new understanding of the natural nanoscale photonic device that enables a small marine animal to dynamically change its colors will inspire improved protective camouflage for soldiers on the battlefield.
The cuttlefish, known as the "chameleon of the sea," can rapidly alter both the color and pattern of its skin, helping it blend in with its surroundings and avoid predators. In a paper published January 29 in the Journal of the Royal Society Interface, the Harvard-MBL team reports new details on the sophisticated biomolecular nanophotonic system underlying the cuttlefish’s color-changing ways.
"Nature solved the riddle of adaptive camouflage a long time ago," said Kevin Kit Parker, Tarr Family Professor of Bioengineering and Applied Physics at the Harvard School of Engineering and Applied Sciences (SEAS) and core faculty member at the Wyss Institute for Biologically Inspired Engineering at Harvard. “Now the challenge is to reverse-engineer this system in a cost-efficient, synthetic system that is amenable to mass manufacturing."<more>
UCF NanoScience Center Develops New Program
The University of Central Florida’s NanoScience Technology Center is developing a new program to make a graphene-based spray coating that would help multiple industries easily and inexpensively fight corrosion.
The center is building on the recent success of UCF spin-off Garmor, Inc. in making a powder form of super-strong graphene available to industry.
“We can use graphene and composite materials to produce new ways for automotive, aerospace, oil and gas, the military and even the medical industries to take advantage of this extremely powerful material,” said Sudipta Seal, director of the NanoScience Technology Center and Advanced Materials Processing Analysis Center and a professor of Materials Science and Engineering.
Seal has published articles on the strength and flexibility of aluminum composites reinforced with carbon nanotubes that is central to the process.
The goal of the program to is to provide a cost-effective, large-area polymer/graphene based coating technology to both strengthen mechanical components such as materials used for the construction of aircraft and cars, and protect materials such as gas and oil pipelines from corrosion.<more>
Low-VOC waterborne technology from Bayer enables primer coating with excellent adhesion
Successfully painting traditionally difficult-to-coat substrates used in a wide range of commercial and industrial applications is now much easier due to a Bayer MaterialScience LLC advance in waterborne primer coating raw material technology. Primers built on this new Bayer technology offer high-performance properties and low volatile organic compound (VOC) content.
Peter Schmitt, field technical service manager, Coatings, Adhesives & Specialties, Bayer MaterialScience LLC, will share research on waterborne coating formulations during a presentation “Super-sticky waterborne primer”
10 a.m., Friday, Feb. 28. Schmitt’s talk is part of the Waterborne Symposium, which is held Feb. 24-28, in New Orleans.
Schmitt will explain how the high-performance, commercial waterborne coating could be used as a primer on various substrates, such as aluminum, wood, vinyl, polyester and polyurethane materials, while giving manufacturers the opportunity to use one topcoat over all substrates. The formulation is a good fit for applications in building and construction as well as industrial coatings. <more>
Cause of Arrowhead Powder Coating Fire Determined
Fire investigators have determined that electrical issues caused a fire at an oil field industry business Tuesday evening.
It happened in the 4700- block of Jacksboro Highway around 6:45, next door to Scott's Drive-In.
Arrowhead Powder Coating is a business with very large, walk- in ovens.
The powder coating that's baked onto oil field equipment is meant to make the equipment last much longer.
The owner of the shop told our crew on the scene nothing inside the building was combustible.
Sheriff's deputies did respond to the scene quickly when someone ran over a fire hose.
That person was expected to be ticketed, and possibly one other.
No injuries were reported.
The assistant fire marshal says damages are estimated at 100,000 dollars.<more>
|Ask Joe Powder|
"Ask Joe Powder"
"Ask Joe Powder" is a question and answer column authored by Kevin Biller of the Powder Coating Research Group. Mr. Biller has over 30 years experience formulating and manufacturing powder coatings. He welcomes your questions regarding powder coating technology. Please write to: firstname.lastname@example.org or post your question through the your facebook id http://letsfinishit.com/askjoe.htm
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Note: The contents are repetition of the February edition. A fresh set of questions will be uploaded in the next edition
I'm a manufacture of powder coatings at VietNam. We have a problem in product as follows:
The reclaimed powder is being sprayed on object, but it has very poor transfer efficiency. ( I know: The reclaimed powder should be added with fresh powder at ratio 70/30 or 60/40, but my customer, he's spraying the reclaim alone. The particle size of fresh powder is 5 microns to 80 microns, D50=28 microns, Percentage of particle size 5-10 microns about 10%). Would you suggest for us how to enhance transfer efficiency with reclaimed powder?
I look forward to receiving reply from you soon.
Thank you and best regards.
Tu Long Nguyen
Dear Tu Long,
Thank you for your question. Indeed this is a challenge. As you know - the best solution is to correct the root cause which can be delineated into two issues:
1. Improve first pass transfer efficiency to minimize the creation of overspray which needs to be recycled. This can be accomplished by regular gun maintenance, always ensuring excellent earthing of the parts to be coated, keeping racks clean and using powders with good particle size distribution (minimal fines and coarse particles)
2. Only introducing a low level of reclaim to the virgin powder. Less is always better but it is wise to never exceed a 30% reclaim to virgin powder ratio.
Obviously you need help now because your customer insists on spraying high levels of reclaim. There is hope however the solution is imperfect. It is possible to improve the fluidization and application performance of reclaim powder. The use of a dry-blend additive is worth attempting as a solution to your customer's application problem.
These materials are based on fumed silicas that have been surface treated to make them hydrophobic. They are supplied as agglomerates of very fine particles of silica typically around 0.2 microns in diameter. Think of them as clusters of grapes. These agglomerates can be quite large and therefore will create defects in the finished powder if they have not been adequately de-agglomerated. Hence the mixing process used to disperse the dry-blend additive is important.
Here are a few guidelines for incorporating a dry-blend additive to the powder. A good starting point is a concentration of 0.2% by powder coating weight. Mix the modified powder coating thoroughly. I suggest a V-blender or something similar to accomplish this. After mixing I recommend sifting the powder through a relatively coarse screen (80 mesh or 175 microns). This can further de-agglomerate the dry-blend additive to help minimize the possibility of "seeds" due to large agglomerates.
Please send me a personal email message and I will provide specific details on the best material to try. It is based on a silane treated hydrophobic fumed silica.
The modified powder will fluidize and transport through the application system much better than unmodified reclaim powder. I would pay close attention to the film thickness of the coated parts.
Thicknesses less than 50 microns (2.0 mils) may exhibit "seeds" or defects caused by the protrusion of silica agglomerates.
Best of luck Tu Long. If possible please provide an update of your progress.
I have a few questions for you regarding the powder coating process and defects. I hope you don’t mind taking the time to answer them for me. Here we go:
Is there any indication, that static electricity could be causing defects such as fisheyes, cratering or BITS in the powder coating process? Is any static electricity generated in any one of the powder coating systems? What products are commonly used when repairing the types of defects noted above? And, last, but not least, how are powder coating companies insuring that dust and lint are at a very minimum prior to coating their products?
Joe, thank you very much for your time. I really appreciate it.
Wow, you have a lot of questions. Let me break them down.
Static electricity - yes there is static electricity and from more than one source when dealing with powder coating application. As you probably already know powder coatings are electrostatically charged typically by a corona mechanism near the tip of the business side (outlet) of the spray gun. This works by very high voltage (80,000 to 100,000 volts) being delivered to the electrode. This high voltage ionizes the air creating a field of electrons or negative charge. (Don't worry the current is very small, typically micro- amps so the process is relatively safe.) The powder is pneumatically conveyed into this electrostatic field, picks up a charge then heads to the nearest ground. The object of the game is to make your parts the closest ground and then the powder deposits on the surface of said part.
So lots of static electricity is generated by the spray system. It's important to note that static electricity is generated elsewhere in the finishing system. The mere fact that powder particles are being conveyed into fluidizing hoppers, through powder pumps, hoses and spray guns creates static charges. This extraneous generation of charge affects powder deposition and can influence transfer efficiency.
Does static electricity cause fisheyes, cratering and "bits"? Probably not. Very characteristic defects are caused by electrostatics however. Excessive charge can build up in a powder coating layer if the powder is applied too thick, too quickly. This phenomenon is known as back ionization. The build-up of charge causes powder particles to microscopically burst away from the substrate. This causes micro defects that resemble volcanoes. These defects cause a rumpled appearance that looks more like localized macro orange peel for lack of a better description.
Fisheyes are caused by a different mechanism and are more distinct in their appearance. Fisheyes are created by a significant differential in surface tension between a molten powder film and a contaminant. Common contaminants are lubricants and oils. Silicone lubes and penetrating oil (e.g. WD-40) are some of the worst actors. Fisheyes are gross defects characterized as deep circular voids in the coating film that reach the substrate. Craters are ambiguously defined as defects similar to fisheyes but smaller in diameter. Craters often do not reach the surface of the substrate and typically look like dimples.
As for "bits" I imagine you are referring to unmelted protrusions in the finish of the cured powder coating. These are not caused by static electricity. Common sources of "bits" are environmental dirt (oven, spray area, unclean application equipment, etc.), unclean substrate or dirty powder coating. They are typically more prominent at thin films (i.e. < 1.5 mils). If the preponderance of "bits' decreases with thicker coating films then you can suspect either the powder or a contaminated substrate surface. If film thickness is not a factor then the contaminant is probably environmental and is deposited on the powder after it has been applied.
Regarding repair - fisheyes, craters and "bits" need to be buffed with an abrasive (Scotchbrite™ or 200 grit sandpaper), the surface wiped (e.g. acetone), dried and recoated. Alternately you can consider using a liquid paint based touch-up if the repair is small and localized. Be careful however as the touch-up may not meet the performance of the original powder coating finish.
Are powder coating companies doing everything to minimize dust and lint? Do you mean powder applicators or powder coating manufacturers? High quality coating shops are very clean with isolated application areas that use filtered make-up air. Their processes are carefully monitored and controlled. It's fairly easy to discern their quality level with a visit and tour of their finishing operations. As for powder coating manufacturers - there is a range of quality. Large producers have prominent quality programs but this doesn't necessarily mean they clean their equipment well or that they produce perfectly clean products. If you can tour their facility it will speak volumes on how they manage their manufacturing and quality programs. Word of mouth is also a good means to learn about a supplier.
I hope this helps you better understand the powder coating process and how defects occur. Please let me know if you have any more questions.
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