polystyrene moulding

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polystyrene moulding

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erdemy1	erdemy1 posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 11, Visits: 225	hi matt, "The epoxy went back to a tacky stage as well due to the use of acetone, then came back to a non sticky feel." Epoxy is thermoset resin, does not reach with chemicals (acetone, thinner etc.) Your epoxy went back to tacky because, it was not fully cured. Room temperature curing is not good, i prefer always the highest temperature (80-90 C) which i can reach. For example; i heard that big yacht hulls fully cured in one year. Here is my composite works
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Matthieu Libeert	Matthieu Libeert posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 955, Visits: 3.4K	coleio (05/01/2015) matt do you know if the stuff you dissolved with thinners went hard again afterwards? So adding acetone in my case will result in a mess of "melted" polystyrene sticking to all the edges if you dont properly pour it out, had to use quit a lot of acetone to get it clean. The epoxy went back to a tacky stage as well due to the use of acetone, then came back to a non sticky feel. To be honest I could say its worth the try, experiment with it, but this is not the best way of making part in my opinion Matthieu Libeert Founder MAT2 Composites X Sports website: www.mat2composites.com
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brainfart	brainfart posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 198, Visits: 1.4K	You are trying to reinvent the wheel. > the part can be made out of polystyrene, wrapped with carbon fibre and once set the polystyrene can be dissolved with thinners, Why? Just leave it in there. And why does everybody want to start building stuff with carbon? Start with glass. > leaving a hopefully perfect one piece part. Certainly not. This is how many aircraft were made, e.g. all the early Rutan designs and their derivatives. and of course boats and yachts. https://en.wikipedia.org/wiki/Rutan_Long-EZ https://en.wikipedia.org/wiki/Cozy_MK_IV https://en.wikipedia.org/wiki/Berkut_360 A big part of their construction involves sanding the microballoon-epoxy covered laminate to get something resembling a smooth surface because it certainly doesn't end up like that on its own. The proper material to use for this is closed cell polyurethane or polystyrene foam, not the cheap insulation/packaging beady polystyrene.
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coleio	coleio posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 68, Visits: 285	matt do you know if the stuff you dissolved with thinners went hard again afterwards?
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coleio	coleio posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 68, Visits: 285	thanks lads and thanks Matt for the helpful video. how badly did the acetone react with the fiberglass resin and what was the finish like on the inside of the part? it would be easy to model with I just don't know what type of glue to use with the balls. using boards would be ok although I remember as a kid cutting it doesn't leave it smooth so again I need to know what kinda glue I need to use for touching up etc...
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FLD	FLD posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 468, Visits: 2.7K	You can buy styrofoam board which is extruded so smooth rather than the expanded balls. Dead easy to pattern from.
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Matthieu Libeert	Matthieu Libeert posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 955, Visits: 3.4K	did the test a year ago, https://www.youtube.com/watch?v=NyF_E_jQ5o8 big mess to work with, didnt used this technique again Dont use it with polyester or vinylester is will disolve the styrofoam epoxy is ok Matthieu Libeert Founder MAT2 Composites X Sports website: www.mat2composites.com
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coleio	coleio posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 68, Visits: 285	thanks good to know
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ajb100	ajb100 posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 346, Visits: 4.4K	Epoxy doesn't disolve polystyrene, polyester does
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coleio	coleio posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 68, Visits: 285	I just saw on a tutorial here that polystyrene dissolves with resin. is there any other material that could accomplish the same thing
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