A page dedicated to the Green News and tips is now added. It has articles with tips for going green to help protect the environment we all affect. Earth friendly advice for going green, reducing costs, consumption & impact on the environment! These widgets! displays the title and a snippet from recent articles published on GLT and the other, headlines from http://www.greenlivingtips.com
Green chemist who found substitutes for harmful materials
Prof Richard Wool, who has died aged 67, emigrated to the United States after graduating from UCC in l969 and went on to become an internationally renowned scientist at the cutting edge of green chemistry.
In the forefront of academic research in biomolecular engineering, he developed radically new methods of using benign substances such as vegetable oil, old newspapers, chicken feathers and flax to create high-performance products ranging from boats to roofing material and breathable synthetic “eco leather” for sports shoes.<more>
Berger offers first-hand feel at gulfInteriors
Berger Paints Bahrain, which has returned to gulfInteriors
this year, said its primary aim in participating at the event is to give
visitors an opportunity to touch and feel, first hand, the quality and
texture of its wide range of finishes.<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: email@example.com post your question through the your facebook idhttp://letsfinishit.com/askjoe.htm
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Why are we seeing random flat spots in a textured powder after the metal has been washed?
What’s up Aaron,
This is a very interesting problem and one that allows me to dust off my chemistry wizard’s hat to help you understand and solve this caper. Random flat spots can occur when using a rather specific powder cure chemistry. In this case it is technically not a “textured” powder finish but a “wrinkle” finish. In the powder technical world we can create textures through a variety of means. Typically a formulator will load a product with either a dry, absorptive filler or a non-melting particle (or both) to create a texture. The filler dries up the binder to the point of restricting melt flow and thereby creating a texture. The incorporation of non-melting particles (typically PTFE-based, a Teflon®like material) causes protrusions in the powder film and hence a texture reflecting the size of the non-melting particles.
The product you’re using and experiencing trouble with probably uses neither formulating approach to achieve its textured surface. Polyester based wrinkle finishes rely on a funky cure mechanism to create the wrinkled surface. This phenomenon is based on a very specific catalyst system that keeps the melted powder film fluid until long into the curing phase. Then after a certain amount of time in the oven the coating surface kicks over and tightens against the fluid film creating the wrinkle.Now here comes the chemistry part. This catalysis system is based on an organic acid. The influence that your wash system has on the wrinkling phenomenon is due to residual alkali on the surface of the metal. Most common metal wash systems use an aqueous solution of a strong base (aka alkali) such as sodium hydroxide. This residue neutralizes the catalytic acid which essentially stymies the wrinkling mechanism. (Boy am I glad that I finished my chemistry degree.)
So what can you do to correct this problem? I suggest that you find a way to more thoroughly rinse the cleaning solution off the metal. This will eliminate the localized build-up of alkali residue that causes the interruption of the wrinkle. If you don’t want to follow this course of action you could consider switching your powder chemistry from a wrinkle finish to a more traditional texture based on filler or PTFE particles formulating technology. Thanks for the question Aaron. It’s always a pleasure to justify all those tuition payments I made long ago.
What makes one powder fluidize better than another?
This is an excellent question. To make a powder coating perform well many physical and chemical properties need to be aligned properly. Fluidization performance is one of the critical physical properties needed to successfully apply a powder coating. For you newbies, fluidization involves incorporating a volume of air into a quantity of powder to prepare it to be transported from the feed hopper to the application gun. This mixture of air and particles not only helps in transporting the material but also enhances the delivery of electrostatic charge to the individual particles as they exit the spray gun
.Particle size distribution (PSD) is the primary factor that influences fluidization. Powder coatings are comprised of range of different sized particles from about 1.0 micron upwards to around 90 microns. The best fluidization occurs with the heart of this range typically 20 to 60 microns. Fines (< 10 microns) tend to agglomerate and impair fluidization. Coarse particles (> 90 microns) are difficult to fluidize because of their mass. Hence the best fluidizing powder coatings possess tight particle size distributions. This means a minimal level of fines and also a minimum of coarse particles.
If you employ a reclaim system to capture and recycle oversprayed powder this can be a factor in fluidization. The best suited particles are preferentially deposited on the parts you coat. And as you can surmise, the fines and coarse particles populate the overspray. Reintroducing overspray into your virgin powder feed will affect fluidization. This increasing in the level of fines and coarse may require adjustments to your fluidization process.
How do you avoid this problem? The best strategy is to use high quality powder coating from a reputable powder manufacturer. The best suppliers have well-controlled grinding processes that yield relatively narrow PSDs. Narrow PSDs deliver high first pass transfer efficiency and hence less overspray to contend with.
A secondary factor that contributes to poor fluidization is moisture. “Wet” powder will be very difficult to fluidize and transport through a powder application system. High levels of moisture are usually due to poor storage and handling of powder coating inventory. Powder should be stored in an air conditioned environment and open bags/containers are to be avoided. In addition you should be careful to avoid introducing “cool” powder into a warmer, moister environment. The cool powder will act as a desiccant and absorb the ambient moisture. It is wise as you move powder from storage to the application area to allow it to acclimate to the ambient application environment before opening the package.Thank you for the question.
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