Testing Home Made Conductive Glue
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- Опубликовано: 22 авг 2020
- So the internet says you can make conductive glue with two ingredients.
Lets see how it fares and how it might be useful for keyboards!
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I looked this up because i wanted to repair my noise cancelling headset. the audio jacks broke. tried soldering and the jacks i used just burned. the solder keeps melting the plastics and no repair shop wants to fix them. hoping this makes it easier as i just stick the wire in the right spot.
I don't know what this might do to headphone/audio signal though, keyboards is a lot simpler in that it just wants a ground path to pull high/low signal on the pins, while audio signal quality matters a lot more on the quality of the power movement.
That said if you're melting the jacks/plastic, you may be attempting to solder at too high a temperature or holding the iron on for too long!
Clear nail varnish and polyurethane work far better with the nail varnish drying harder and the polyurethane drying like rubber... Nail varnish will measure a current with as little as 0.25/1 ratio although 50% is preferable... Polyurethane on the other hand requires 1/1 to work well but will also work with 50%. As for making a circuit with a mixture, even the PVA should work well, perhaps try a 200% mixture... Trace the glue out like a circuit and then dust graphite over the glue, leave to dry and then blow off the excess... Remember, patience is key here... The idea of the surface dusting is to decrease resistance within the circuit and thus reduce heat as these kinds of conductive materials can be extremely prone to resistance and will heat up and burn out very quickly... In the industry they use silver oxide I believe mixed with epoxy resin which works extremely well, with extremely low resistance... I'd say using graphite is a good choice but I make DIY conductors using all kinds, iron filings, graphite, copper oxide, silver oxide, sodium, magnesium powder... And have found some very interesting results
Hi John,
Thats a really interesting approach in that using a 'surface' coating kind of approach to reduce resistance, which makes perfect sense. Great feedback!
The only thing I can think of directly for some materials like iron powder/filings is oxidation/rust which would significantly increase resistance/reduce conductivity. Which any materials surface sitting than embedded would potentially suffer similar 'degradation' maybe?
If I can find where my graphite went, I can definitely give it a further try some time haha.
Cheers!
I made some conductive paint using nail polish + graphite, it works well. I use it to enable a touch screen on my gloves: not perfect though since it needs a copper wire going through it (sewed) in order to touch the finger. To avoid the I tried to inject some of the "conductive paint" using a (vaccine) syringe. But it did not work, I guess the needle was too thin.
(I missed the opportunity to inject these conductive paint into my bloodstream, I'm quite sure it would have give me some superpower.)
Pretty innovative approach, better than having to use salami sticks all the time. I would say a bigger sized needle tip, though you would need to probably put the graphite into saline than nail polish if you wanted it to spread through the body, but as a non-medical professional, I would not advise that for your longevity in innovation.
@@theboard the copper wires I'm talking about are thin as sewing threads (you just need to take one strand of those multicore wires)
@@ytrew9717 just would have oxidised over time though which would have reduced its conductivity over time too.
@@theboard true, we'll try your thread technic. Looks great, but not sure it works with nail polish (which is all we have)
@@ytrew9717 metal + graphite would conduct. Nail polish would potentially seal unless your ratio is high. Bigger needle bigger hole, bigger space for graphite/nail polish mix. I don't think saline would help though haha.
hello! where is your discord link?
Please send an email to us at: theboardpodcast at gmail and I'll send one over for you :)
Can gum be used?
It depends really on the type of gum binder and how much carbon or conductive material that is mixed into the gum binder.
See...When you waited for six weeks, the compound, which is ACIDIC, has dissolved some METAL IONS in the mixture. THAT's why it's conducting...
If you do it with THAT graphite alone, it doesn't work, no matter the ratio...
try using nail polish + graphite
@@ytrew9717 have you actually tried?
@@FreedomAirguns yes but just as paint, I did not try 1) if it can glue things 2) on a PCB (to enable touch screen gloves, it works with conductive wires though). Did you find a good solution to your problem?
@@ytrew9717 I bought a professional product, approved by NASA for low-degassing properties. MG Chemicals 9410-3ML, it cures in 7 min @ 150 ̊C with a cheap heatgun. Perfect conductivity for my applications. I keep it in the fridge but I should put in the freezer, nevertheless, so far so good.
Highly suggested. It costs a lot but it's a serious product for serious applications. Homemade "mixtures" are a fire hazard and glues/nail polish can CATCH FIRE when WATTS of current pass through. Even an USB-1 port is enough to start a FIRE.
I can understand the fun of research and experimentation but NO thanks, not in production or with circuits I actually want to use.
Tried hard with that thing. Ain't gonna work. Basically, anything that encapsulates conductive powders is going to isolate them. They only conduct as long as they're wet, allowing the free movement of electrons. But, the moment they dry out, conductivity is lost. The ONLY way to get around it is to use graphene nano wires, metal flakes of a reasonable size and a conductive silicon or epoxy which can shrunk and make the metallic particles touch each other when it's dry.
But, there is a trick. If you leave a small current with a good voltage applied when it is wet, it creates a path in the mixture and, as long as the current is applied when it dries, you should get a conductive element in the end. The problem is that it is a hassle and it is not suited for most applications. Save yourself the pain and buy from a professional manufacturer, unless you want to invest thousands to get yourself the smallest batch possible.
Happy to agree to disagree. The numpad I built using the revised glue formulation, for the ones that got signal, still work. The conductive material content has to be high enough that there will still be conductive pathways through it, that I am happy to acknowledge, but the finest of channels is all that is technically required to trickle current.
@@theboard I'm telling you, you got lucky. I have the same exact products and that graphite sucks. It's probably a mixture with impurities. I have used a bigger ratio and yet, I got nothing out of it when it dried out entirely, days later...
When it's still soft, it conducts, but then it doesn't.
Just a few hours ago, I tried mixing epoxy with a HUGE amount of solder paste (tin 60/ lead 40) and I just tested it... NOTHING.
When you mix them properly, *thoroughly* , the particles get engulfed. Flakes and micro wires are needed to succeed with low resistivity and nice conductivity. Or, at least, that's from my experience...
Anyway, I'm happy it has worked out for you. It didn't for me. After all, if it really worked out properly, you'd have a million dollars product in your hands by now...How come it is nowhere to be found in that formulation?
If you're SURE it works, sell it. I'd buy metric tons, NOW.
Have a look up for things like carbon dag, which is used extensively in electron microscopy, and other carbon based conductive adhesives, sometimes called wire glue also. There is formulations for conductive carbon/graphite materials, they are expensive which is why its not commonly used. My attempt to make one with cheap materials is just showing proof of concept that it is possible, and my personal situation already shows that it doesn't work at lower concentrations but higher did. If I went even higher, or found a better binder that isn't PVA, well, thats just part of research and science.
Empirically, my own results show its possible. That is the best I can say to you right now that, its not impossible, just its not perfect.
Epoxy may be even worse as a binder than PVA, but there may be others that might work better, or the glue may have conductive properties in itself to assist, and so on, so forth.