dextrin from starch - Archive File

[megalomania]

kingspaz
Frequent Poster
Posts: 347
From: UK
Registered: SEP 2000
posted 04-21-2001 05:15 PM
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i was reading in the comptons encyclopedia on my PC and it said that starch turns to dextrin when heated to 182*C. i was just wondering if anyone has succesfully done this.


ALENGOSVIG1
Moderator
Posts: 766
From: Vancouver, Canada
Registered: NOV 2000
posted 04-21-2001 05:18 PM
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Yes just put it in the oven and wait a few hours, or i just put it on max and watch it until It turns brown, then take it out. More information on the subject is on J's site.


kingspaz
Frequent Poster
Posts: 347
From: UK
Registered: SEP 2000
posted 04-21-2001 05:45 PM
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thanks


sealsix6
Frequent Poster
Posts: 154
From: NYC,NYC,USA
Registered: NOV 2000
posted 04-21-2001 06:44 PM
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What could someone do with dextrin?


FadeToBlackened
Frequent Poster
Posts: 201
From: Hell
Registered: MAR 2001
posted 04-21-2001 07:02 PM
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Its used as a binder in some pyro comps. and as a desensitizer for lead azide.


sealsix6
Frequent Poster
Posts: 154
From: NYC,NYC,USA
Registered: NOV 2000
posted 04-22-2001 08:46 AM
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Oh could someone put the dexitrin with BP and make like stars from them? Or dexitrin + Gas to make a diffrent kind of napalm?


DarkAngel
Frequent Poster
Posts: 592
From: ?
Registered: SEP 2000
posted 04-22-2001 09:40 AM
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I don`t think dextrine napalm would work ,When a mix of dextrine dry`s it becomes rock hard
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DarkAngel

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kingspaz
Frequent Poster
Posts: 347
From: UK
Registered: SEP 2000
posted 04-22-2001 05:04 PM
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dextrin is used in model rocket engines to bind the black powder fuel together. the dextrin is the reason why its hard as fuck to grind rocket engine propellant up. so i would imagine it would be quite handy for making stars.


BoB-
Frequent Poster
Posts: 679
From:
Registered: SEP 2000
posted 04-22-2001 06:45 PM
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I use Dextrin to bind my BP stars together, its simple, and you can add *some* color to it.

[urbana]

Of course it works.
I have made dextrin from starch for at least 3 times. Every time by cooking starch in a oven and just
to make you more confident about this, without a temperature control.
I just followed the conversion watching every quarter of hour, when i opened the oven for mixing.
It really works
urbana

[jfk]

yeah, i just oven bake corn starch into dextrin, mixxing it around every 20 min till its brown.

as for colours - how would you go about oclouring it ?

- pigment?
- food colour?

or a chemical that burns with a coloured flame? (strontium nitrate, CuSO4 ect..) ?

[DBSP]

when you bind BP with dextrine do you use water to bind it or can you use other solvent that dry faster?

[urbana]

As long as I know water is the best substance to wet dextrin in BP. As a matter of fact I use a water and alcohol solution (75:25)only to avoid growth of saltpetre crystals during drying.