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Recoating kite fabric

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nixmatters
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Re: Recoating kite fabric

Postby nixmatters » Fri Mar 27, 2020 9:14 am

I'm not that fluent with silicone coatings and adhesives, my hands on experience is wiith platinum crosslinkers only.

Doctors blade coating is what all manufacturers of kite canopy cloth use, whether silicone or PU based, but good luck to anyone who wants to try it on a kite :lol:
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Re: Recoating kite fabric

Postby Regis-de-giens » Fri Mar 27, 2020 8:10 pm

I did not know it was based on Dr blade technics.
Interesting. And is it a 2k silicone curing with high temperature (while nylon is sensitive to heat) or a rtv1 that cures with hymidity ?

nixmatters
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Re: Recoating kite fabric

Postby nixmatters » Fri Mar 27, 2020 11:39 pm

RTV1 (ambient temperature) condensation curing needs more time than 2K addition curing, which can be accelerated at higher temperature.
Not that high to harm the nylon cloth, but not very practical for coating a kite.
The first seems to be the way to go also for this reason:

quote:
"Ambient curing silicone resins are high alkoxy functional, low molecular weight silicone resin elements. The low molecular weights result in products with very low viscosities, thus permitting very good processability, e.g. in spray application.
unquote

Attached paper sheds some light although not directly applicable to fabric coatings
Attachments
taking the heat.pdf
(651.71 KiB) Downloaded 8 times

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Re: Recoating kite fabric

Postby kiteykitekite » Sat Mar 28, 2020 12:02 am

An innovative methyl-phenyl siloxane resin has a methoxy content of between 15 and 20% w/w and an active substance content of 90% (solvent: xylene). It is important to note the low viscosity of around 130 mPas, which gives the formulator a great deal of freedom, since only very low amounts of solvent may need to be added during manufacture of the coating. The benefit is very low smoke formation during the initial stoving.
Because of regulations in some areas of application, development of new high solids silicone resins is based on ethoxy functional derivatives. One such resin has an ethoxy content of between 18 and 25% w/w and an active substance content of 95% (solvent: methoxypropyl acetate), with an outstandingly low viscosity of only approximately 50 mPas, which is particularly suitable for very low solvent content paint systems.
Viscosity is good. Solvents are interesting, being xylene in one and methoxypropyl acetate in the other. I wonder if methoxypropyl acetate would be good for other things? More toxic than toluene it seems though....

I am not sure if these silicones need curing at higher temps cause they mention "stoving". They talk about ambient and heat curing so obviously there is both, or likely mechanical properties just vary with or without heat.

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Re: Recoating kite fabric

Postby nixmatters » Sat Mar 28, 2020 10:02 am

here you have a low viscosity sprayble, organic solvent, cross-linking rtv silicone coating, conveniantly packed in a pressurized spray can. Dries in 24 hrs, cures fully in 72hrs:
http://www.atsko.com/silicone-water-gua ... z-aerosol/
And I guess there are other similar products on the market, so why discover hot water?

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Re: Recoating kite fabric

Postby kiteykitekite » Sat Mar 28, 2020 2:26 pm

There is better ways to spray but that looks good.

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Re: Recoating kite fabric

Postby Greenturtle » Sat Mar 28, 2020 2:45 pm

Isn’t kite canopy material made from polyester, not nylon?

nixmatters
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Re: Recoating kite fabric

Postby nixmatters » Sat Mar 28, 2020 2:50 pm

Greenturtle wrote:
Sat Mar 28, 2020 2:45 pm
Isn’t kite canopy material made from polyester, not nylon?
LEI kite canopy is polyester, most ram air (foil) kites - nylon. Not a great difference when it comes to coating. Ram air kites can use silicone coating as there is no need for double adhesive tape, just sewing.
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Re: Recoating kite fabric

Postby kiteykitekite » Sun Mar 29, 2020 12:23 am

Foils can use either and so can tubes. Tape is just for aligning before sewing, foils or tubes can use glue instead.

nixmatters
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Re: Recoating kite fabric

Postby nixmatters » Sun Mar 29, 2020 8:03 am

Dear Foilholio, pls stay with foils where your knowledge and experience apparently is. The adhesive tape in LEIs is absolutely essential for seam strength and integrity, not just the manufacturing process (aligning before sewing). It's actually rather the opposite for the canopy seams - the seam supports tape.


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