Powder coating, due to its superior adhesion and protection qualities, is rapidly replacing paint as a finish coat. Also, because paint application spews large quantities of solvents into the air, it has come under the disapproval of the EPA. plastic powders used in powder coating are enviromentally friendly because less is lost in overspray. This book explains the entire process from start to finish using many illustrations. It also lists suppliers and vendors for those interested. Few technical books are available on this subject.
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Book Description
Editorial Reviews
Excerpt. © Reprinted by permission. All rights reserved.
As usage increased, industry developed different kinds of powders for different applications. Currently, there are two broad categories of powders: thermoplastic and thermosetting.
Thermoplastic powders retain their plastic properties even after repeated meltings. The basic chemical structure remains unchanged. Thermoplastic powders are composed of very large molecules and consequently there is a limit as to how finely they can be ground. Because of that fact, they cannot be used for very thin applications, but rather where thicker films are required. Typical thermoplastic powders include: polyesters, polyvinyl chloride, polyethylene, polypropylene, and nylon.
The first thermoplastic powders were polyethylene. Polyethylene powders have good electrical insulating properties. They resist corrosion and are often used where that is important. The melted film has a slippery surface which allows the object to be cleaned easily.
Polypropylene powders are very inert, and are used where the part may be subject to chemical attack.
Nylon powders resist abrasion well, and withstand impact, in addition to having good wearing qualities. Nylon has good lubricity and a low friction coefficient, thus it is used in situations where sliding parts and rotating bearings are present. Polyvinyl chloride powders have good weathering qualities and are durable. They also are flexible and are often used on metal parts that may be subject to bending and drawing.
Thermoset powder coatings, the second category of plastic powders, are different from the thermoplastic powders in that upon heating and initial melting, they cannot subsequently be remelted. Reheating would simply cause them to char. Their chemical structure changes as a consequence of the first melt. The powder can be ground quite fine which allows for thinner coatings than is achievable with the thermoplastic coatings. Their thinness approaches that of thermoset powder coatings: (1) epoxy, (2) polyester, (3) acrylic. Of these three categories, the epoxies are the most commonly used and have the widest variety.
Epoxy based coatings offer good corrosion protection and have good electrical insulating qualities. However, they are adversely affected by ultraviolet light and consequently cannot be used where they would be repeatedly exposed to UV. The alteration that occurs as a result of exposure to UV is primarily cosmetic, i.e., chalking, discoloring. The coating still retains its useful qualities. The corrosion protecting qualities have found many applications, i.e., reinforcing rods in concrete are coated with the material which helps prevent corrosion and subsequent cracking of the concrete. Epoxy based coatings are rapidly replacing the porcelainized surfaces heretofore found on bathtubs, washing machine lids, refrigerator interiors, etc. They resist cracking upon impact much more so than does porcelain.
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Most Helpful Customer Reviews
7 of 8 people found the following review helpful:
4.0 out of 5 stars
Helpful book on the basics.,
By Glen Baker (New Hampshire) - See all my reviews
This review is from: Powder Coating Made Easy (Paperback)
Powder Coating made easy is an excellent primer that covers the basics of powder coating. An excellent reference for any one that is beginning in the powder coating business.
5 of 6 people found the following review helpful:
2.0 out of 5 stars
Maybe if it had a little better quality,
By
This review is from: Powder Coating Made Easy (Paperback)
I biggest complaint was the quality. Looks like a 1980 printer printed sideways and folded it to make a book. The pages fall out VERY easily. However, as far as information goes, it is good if you were doing a report. If you are trying to learn about getting into the business, wrong book. It seems out of date, and for the most part not very helpful. If it told a little more about being better at powder coating, or teaching you anything to even done with a gun, I would have found it more helpful. It's great for a report, nothing else.
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