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Old 02-12-2010, 03:58 PM   #1
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Nanoclay Blast Media

Has anyone worked with anything like the article below describes? It sounds like the perfect media for stripping an Airstream.

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Tuesday, November 24, 2009

US Technology Corp's Nanoclay Blast Media Faster, Cheaper, Gentler and More Durable

US Technology Corporation (Canton, OH) provides comprehensive surface preparation and coatings removal to the aerospace, aircraft, electronics, automotive, shipping, petroleum and structural industries. Raymond F. Williams and Daniel L. Kinsinger detail a method for making polymeric blast media products with nanoclays in U.S. Patent 7,622,518. The first step involves blending a melamine compound with a cellulosic material and compression molding the first blend. This first blend is then cooled and then ground. In the next step of this method, a urea compound is blended with a nano-clay material to produce a second blend and compression molded. This compression molded second blend is then ground to produce a particulate second blend. The particulate first blend is then blended with the particulate second blend to yield a blast media product. It can cost effectively removes organic coatings from substrates without substantial risk of damage to sensitive metal or composite substrates according to inventors Williams and Kinsinger.



The blast media with nanoclay may be used for removal of standard aerospace coatings such as epoxy primers and polyurethane topcoats from very sensitive metal or composite substrates with better efficiency than was previously available. This media coating can be removed at accelerated speeds as compared to prior art blast media. The safety factor of this media on thin skin aluminum or composite surfaces is high. Coatings can be removed with virtually no damage to such substrates, leaving protective coatings such as cladding and anodizing intact. Also, the durability of this media helps to maintain economic feasibility in large-scale aerospace applications.



Various different embodiments of this media address specific applications related to the aerospace industry and industry in general. All of these embodiments make use of nanometer-sized montmorillonite clay particles, which improve surface integrity and provide advantages in the mechanical and thermal properties of the polymer. These results are achieved with no increase in specific gravity due to the very low amounts of nano-particle needed, i.e. between 1/2% and 5% by weight. These results demonstrate that the overall increase in efficiency of this media is three to four times faster than unfilled polymer while the durability has more than doubled.



The patent also encompasses an abrasive media for the removal of coating or for the preparation of surfaces prior to coating or cleaning comprising a thermosetting polymer with an additive, wherein the additive has a major dimension and a minor dimension. The minor dimension is from about 1 nm to about 20 nm. The additive may be the nano-clay material, or alternatively may be a polyhedral oligomeric silsesquioxane material.



The patent also encompasses a method of making a sanding pad for removing an organic coating from a substrate comprising the steps of blending a liquid polymeric material with a nano-clay material to produce a first blend, blending a cellulosic material with said first blend to produce a second blend. This second blend is then extruded to form a continuous sheet of abrasive material into individual pads.



Figure 1 shows a brief flow chart of the manufacturing process for nanoclay blast media.


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Old 02-12-2010, 04:13 PM   #2
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Quote:
Originally Posted by Aviator View Post
Has anyone worked with anything like the article below describes? It sounds like the perfect media for stripping an Airstream.
I have not.

As a do-it-yourself-er, the method appears to me to be much messier & labor intensive than chemical stripping.

From a polishing standpoint, the method's use, to me, looks like it could leave a surface which would require more effort to achieve the desired result.

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Old 02-12-2010, 05:22 PM   #3
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It could be a great thing for the restoration shop. Be interesting to see if it catches on.

How do they strip airplanes now? I know about liquid paint stripper but it sounds like they use media blasting too?
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Old 02-12-2010, 05:28 PM   #4
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The do use media blasting in many cases. This product appears to be aimed directly at industries working with aluminum. Airstreams and aircraft. I would think this would be especially effective on the Airstreams since the end caps are a much softer aluminum than the sides.
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Old 02-12-2010, 07:12 PM   #5
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Aviator, have you ever used soda?
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Old 02-12-2010, 09:19 PM   #6
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That was my plan for an automotive application (1928 Model A Tudor) which is my next project. The Model A is steel, so heat build up isn't as much an issue as with aluminum. Soda builds much less heat than traditional blast media.
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Old 02-12-2010, 10:04 PM   #7
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We've discussed various blast media. I know that walnut shells will peen aluminum -- roughening the surface and causing warping. This Nanoclay product description reads like an organic hard/softness not terribly dissimilar from walnut shells. We've heard about plastic beads, soda, dry ice. CO2 sounds pretty good.

There's a lot of info -- some of it conflicting:
http://www.airforums.com/forums/f441...nks-16475.html
http://www.airforums.com/forums/f227...est-26533.html
http://www.airforums.com/forums/f441...oval-6285.html
http://www.airforums.com/forums/f441...oat-38218.html
http://www.airforums.com/forums/f381...ust-29832.html
http://www.airforums.com/forums/f441...num-14144.html
http://www.airforums.com/forums/f478...elp-15222.html
http://www.airforums.com/forums/f441...ues-53653.html
http://www.airforums.com/forums/f441...ish-51563.html
http://www.airforums.com/forums/f381...ing-48980.html
http://www.airforums.com/forums/f441...val-35559.html
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