Adding copper powder to antifouling

[s/v Jedi]

Originally Posted by I14

Sorry to be a killjoy but it's probably not compatible with a solvent based ablative. I have made a 2K waterbased hard cuprous oxide A/F that did well on my raft but have never tried to commercialise it. It uses a water micible isocyanate as the Part B

We’ll see. It’s compatible with diesel fuel, has Naphta just like the paint, so I think it will be compatible with the cheap copper based ablatives.

This kind of stuff really needs a test in order to come to conclusions.

Edit: 2K waterbased? What is that?

[RaymondR]

Originally Posted by s/v Jedi

I love the idea, but a possible failure to hose off the paper after cure makes for interesting visuals

Your comment bought to mind an add on TV that had a small child wandering about with a tail of toilet paperhanging from his pants.

[I14]

Sorry thought you were talking about mixing in the WB Killz product, the Biobor should go in OK. 2K means 2 (K)omponent, German heritage, normally the term is used in refinish paints for cars. I made an emulsion based hard AF with a reactive polymer in Part A and the Part B (second component) was a water miscible isocyanate. Quite common now as in industrial paints

[s/v Jedi]

Originally Posted by I14

Sorry thought you were talking about mixing in the WB Killz product, the Biobor should go in OK. 2K means 2 (K)omponent, German heritage, normally the term is used in refinish paints for cars. I made an emulsion based hard AF with a reactive polymer in Part A and the Part B (second component) was a water miscible isocyanate. Quite common now as in industrial paints

Aha. I can speak German but didn’t realize you were using German

So what was part A, water based? I’m not good enough in chemistry to know what kinds of emulsions are possible…

I really need a multi season AF because we need to haul out during hurricane season when we want to travel away from the boat (harbor is evacuated during hurricanes)

[I14]

Yes the entire system was waterbased and had the required chemistry being 2K to survive underwater. It was not an ablative but could be made to do so.

[foxinsox8]

Originally Posted by Uncle Bob

A riveting tongue in cheek reply to our good captains assertions re his "facts" about the oxygen content of water at different temperatures.

Please stop making Australians look bad. I guess you'd think if I was talking about the varying amounts of carbon dioxide in rainwater that I was asserting that too meant I believed water was something other than H20. Oh dear.

[thinwater]

Originally Posted by skipperpete

The dis incentive to produce a truly long life antifouling is huge and it’s not too much of a stretch to suggest that the lightbulb conspiracy ( Phoebus conspiracy) in 1920 has had an effect regarding the pursuit of excellence with bottom paint. Just imagine the impact on the paint industry of a bottom paint that lasted 10 years and was totally non toxic, what company would deliberately erode its earnings by producing a way better product, particularly in this economic climate?

Must be the same reason we don't have long life lubricants and engine coolant. Oh yeah, we do. And that eroded earnings, having been in the industry.




BTW, long-life light bulbs, back in the day, were energy hogs. I remember them in the 60s. Thicker element, not as efficient.

[Uncle Bob]

Originally Posted by foxinsox8

Please stop making Australians look bad. I guess you'd think if I was talking about the varying amounts of carbon dioxide in rainwater that I was asserting that too meant I believed water was something other than H20. Oh dear.

Well thank you for your opinion, I wonder if you could enlighten me as to what happens to a water molecule (h2o) when it sheds the oxygen, does the hydrogen combine elsewhere? Would the result still be water? My understanding is that hydrogen is far more volatile than oxygen so would not the water molecule be totally decimated?
Given that the oxygen levels are apparently variable and measurable at different temps do you really believe that the oxygen levels are really quantifiable as expressed by the good captain in relation to the performance of an entrapped copper solution used to supress marine growth or could it possibly be that the regional differences are more a function of temperature than oxygen levels. I would suggest that this is a more reasonable hypothesis.
But hey, you may disagree, as is your right.

[RaymondR]

One of my other schemes was to bond a permeable layer of thin rayon fabric over the below water line hull and overlay it with a layer of cellulose acetate. The permeable layer would be supplied with a solution of copper sulphate from a reservoir in the boat, which would distribute under the cellulose acetate via the rayon permeable layer and then slowly permeate through the cellulose acetate to kill off any colonizing marine organisms.

I think I decided that glueing on the rayon was too fiddly and went looking for something that was permeable but would spray on and then wandered off to build a battery charger or something.