ohiomike Wrote (General forum): ------------------------------------------------------- > A major issue with fibers is that they are resin > hungry materials. If you want flex in the material > add polyurathanes. Most two part polyurathene > casting resins sold at craft stores are straight > chain polyols so they have relatively high > molecular weights to hydroxide values. Theby spota - Polymer Working Group
Brian Dolge Wrote (General forum): ------------------------------------------------------- > Have you considered using powdered fibre-based or > "volume enhancing" laxatives like musilex or any > psylium based product? As Mike pointed out it > won't enhance flexibility but it might increase > toughness by as part of a composite material. Hey Brian! I tried this recently. I wentby spota - Polymer Working Group
ohiomike Wrote (General forum): ------------------------------------------------------- > Try mixing the catalyzer into the flour first, > partially fill a pan with the resultant mixture, > and then using a syringe write a pattern in the > pan with FA, add another layer and repeat. I would > be very interested to see if you have any > interlayer adhesion issues and what your surby spota - Polymer Working Group
Hey all! I will continue my this thread under the Gooey Extrusion sub-forum as it seems a more appropriate place to talk about... well, gooey stuff See you over there!by spota - Paste Extrusion Working Group
Hey all! I'm happy to inaugurate this sub-forum and I will do it with this matter which is what I'm working on. To start, i'll explain what Furfury Alcohol (FA) is and why I chose to investigate it. FA is a brownish flammable liquid, of the similar viscosity as water. It is produced from plant waste through chemical reaction with sulfuric acid and is quite a cheap and readily available product.by spota - Polymer Working Group
I like the organisation, Seb! I'm more of a red commie than an anarchist you see Off to post my first thread in the Goeey part! Actually, it's a follow-up on that old "Furfuryl Alcohol" tread in general forums...by spota - General
RoundSparrow: I damn agree! Call me obsessive compulsive, but a little order in these forums would do a lot of good and your scheme seems to make a lot of sense. Zach: Tattoos, really?? What is your tattoo about? I design tattoos for the love of art, that's why the interest. For now, I have only made some that were tattooed on others, girlfriends mostly. I have one for me all thought up: a Promby spota - General
I have to give credit to whomever told me to try regular flour! I made a batch 2 days ago and left it to polymerize with straight catalyzer, no blocker. here are the figures: 4 grams of flour 4 grams of Furfuryl Alcohol 1 gram of catalyzer solution (40% pTSA in a common alcohol sovent) The result, as I saw them today are a flexible yet tough black polymer. Comparable to, say, shoe sole materiaby spota - Paste Extrusion Working Group
Found some bulk proiders here: The cellulose fiber is called SANCEL it's packaged in 25kg bags It's the same stuff you can buy at a nutritionist: only that the nutritionists 250g costs you 6$ I'll try that as a filler too.by spota - Polymer Working Group
I will try regular flour and then some fiber food additives like the ones you mention (psylium, oat fiber and other mucilagens), just to learn the effectiveness of these so called water soluble fibers. Actually I'm very positive that cellulose fiber, wood dust and some other plant derivates will help me as they contain the right kind of fiber. What I was wondering is if anybody had been workingby spota - Polymer Working Group
Interesting... Maybe these Alkali silicates will help you lower down the fusion temperatures of your ceramics? this is what in German would be called "Fliess Mittel". I know that for this purpose Postassium Carbonate, Sodium Carbonate, Lead Carbonate are being used in the glass industry. My chemists gut feeling tells me that Alkali silicates should lower the melting temperatures down to more seby spota - Paste Extrusion Working Group
Mike I thought along the same lines as you. having a vat with the cheap catalyzer I'm developing and printing Furfuryl Alcohol or Furfural threads on top of it, then dropping the layer a level. it would make for a ruff prototyper if we can solve the problem of enclosed volumes in the 3D models. It's like a SLA (stereo lythography) but without lasers.by spota - General
Thanks for all the input. maybe I should explain a little better what I have tried allready and what I'm aiming for: I have allready tried starch and it has no effect as a crosslinker. I'm working with a brittle resin, wich os fantastic for hardness, but needs some kind of filler that crosslinks the polymer and has some flexible properties. Starch cannot do this as it's a crystalline type of mby spota - Polymer Working Group
I'm opening this thread to call on anyone that may have worked with fibre powder, be it cellulose, oat husk, coconut, apple etc fibre powder. What would be a good and cheap supply of this and where could I get it? I'm looking fos something that has a very fine grain size (50 - 100 micro-meter) so that i can use it as a filler for resins that by itself are very stiff but brittle. I have found celby spota - Polymer Working Group
Hey all! Thanx Zach! I also think this could be usefull. I will try and put together a recipy that people could easely work with. I guess that building a simple circuit board would be th enext step... but I'm not very much of an electronics guy, so maybe somebody has a simple diagram that I can build. Nothing crazy. Just stuff to test resistors, transistors, condensators etc with this type of trby spota - Paste Extrusion Working Group
Hey all! After 2 weeks spent with a broken ellbow, i'm back on the workbench. Nothing, i say NOTHING will hold me back I have had some interesting results while mixing copper powder with this resin. I mixed around 70 weight% of copper vs the resin mix. The resin polimerzed slow enough so that the copper powder subsided towards the bottom of the polimer. When braking off the sample, which is 2mby spota - Paste Extrusion Working Group
I have read about this a couple of weeks ago. The tricky part, on top of the painstaking layer per layer dip thingie, is to find out the correct suspenion of clay particles. It can't be to much and not to little, and the clay type has to have the correct platelet-group size. This is as far as I remember reading, i think from Physorg.comby spota - Polymer Working Group
(from builders blog entry) Hi all! Today I made some progress on the blocked catalyzer. As a reminder, the catalyzer is para-Toluene Sulfonic Acid (pTSA), wich is a strong organic acid, in solid form. I have dissolved it in Isopropanol alcohol (a solventquite similar to Ethanol). This catalyzer, if added in this solved form to Furfuryl Alcohol (FAlc, the actual polymer resin) will cause it toby spota - Paste Extrusion Working Group
Hey Viktor! Good idea! I will try starch as it's pretty easy to get and it's also a standard product. I don't know how much fiber it contains, but it's worth a try. Its always great to hear about your sintering efforts. They really seem to be going well! It seems that glass, having a big thermal inertia is easier to sinter than metal, is that correct? This would be an interesting result and wouby spota - Paste Extrusion Working Group
Hello Mike, nice to hear back from you! Actually i started with Furfuryl Alcohol and not Furfur Aldehyde because it seemed to be less volatile as in less vapors. But I do have both and I want to complete the same tests on FAld as I'm doing on FAlc. Yeah, the sealed pot was a stupid idea, I know Afterwards I remembered you saying something about this in one of your previous posts. I think I wilby spota - Paste Extrusion Working Group
Fascinating stuff! To bad i don't have such powerfull laser sources, it seems that a whole world of sintering possibilities lies there to be experimented... Anyway, I will keep you indformed with the progresses I make with heat/light/UV activated polymer resins. Let's see if we can get some neat application working at low temperatures! I'll inform you with mixture proportions soon. I'll also tby spota - Paste Extrusion Working Group
Viktor It sounds really amazing what you are doing. One question: why are you concentratinmg on gold? Is that your trade? Are you a jeweler? I would have guessed that using bronze or messing (brass) would be a cheaper and more obvious choice. Also, correct me if I'm wrong but gold melts around 800by spota - Paste Extrusion Working Group
Hello all! The mix i'm testing now is made of Furfuryl Alcohol (FA, the actual resin ) and p-Toluenesulfonate (pTS: ), wich is a solid organic acid that you can solve in Isopropanol. On the dissolved pTS you need to block the acid functional group. You do this by adding wether Vinyl-ether or N-Methydiethanolamine (http://www.acros.com/DesktopModules/Acros_Search_Results/Acros_Search_Results.aspby spota - Paste Extrusion Working Group
For this type of resin we won't even need UV light. A regular 30W halogen bulb with a magnifying glas or a tweaked laser diode will do the trick. The important thing here is to get the surface of the resin to heat up at about 60-70by spota - Paste Extrusion Working Group
There definitely is something to be learned from this for our project. Any deposition technique will need to cope with coiling phisics. As an example, the curvature of a an angle, say 180by spota - General
Harrumph.... Sean, you may be a bit of a prophet, even though you were over-eager with the "terminal" part Yesterday I made an exploratory test with 10g of Forfuryl Alcohol and an acidic catalyzer, just to see how fast that thing polimerzes... Darn!!! That thing is fast and exothermic! It littelrally popped the lid of the plastic dish i was using. Most of it went to my hand and the wall. Nothinby spota - Paste Extrusion Working Group
Hello all! I've been a little distant these last couple of months. As someone has said in another post, having a private life sometimes seems to slow your research down to a standstill. I have been helping my girlfriend with her apartment down the coast, and I must admit that spending my weekends over there has been a constant temptation that i am not strong enough to resist But this is not thby spota - Paste Extrusion Working Group
Nice work Zach! It's great to see how you made this new technology blend into RepRap so fast! Hats off!by spota - General