General > General Technical Chat
Super Glue mini-bottle that doesn't harden by itself while stored capped?
jpanhalt:
Glass can be pretty reactive (it's the SiO2 on the surface). That doesn't usually affect epoxy or polyester, but it might affect CA. I often use a powdered plastic (typically phenolic). Dave Brown has/had "phenolic" micro-ballons. West 410 microlight filler probably will also work. I believe it is phenolic too. I use either for something that is non-reactive, light weight, and sandable.
John
silenceisblissfulness:
Talking of glass, when I was in primary school, they taught us "glass is still fluid, even glass in windows made centuries ago". Even at 7 yrs old, I was skeptical about that. I saw a video over the last year or so where they refuted that and said why - I can't remember why - but it made sense that it's NOT a liquid. (not sure where I saw it - you know how it is with YouTube consumption mixed with TV - it's all a blur of metadata after a while)
mzzj:
--- Quote from: Cecil on April 24, 2023, 04:30:57 am ---Two superglue tips that perhaps everyone does not already know: There are activators sold that substantially decrease the cure time. You can apply it to the workpiece before the glue or spray it over top of the glue. But I would never buy it again. It's just acetone which I always have on hand; Second, the glue will last twice as long before hardening in the bottle if stored in a refrigerator.
--- End quote ---
"secret" ingredient in many of the CA accelerators is N,N-Dimethyl-p-toluidine. Acetone works only as carrier/diluent.
AFAIK some other amines are also used, one of my friends is badly allergic to amines and even small amount of CA accelerator triggered asthma style symptoms.
Cecil:
I'm not sure if my acetone is wet. I comes in a gallon can from a big box store. It is certainly not watered down as much a fingernail polish remover. I just tried it when I ran out of activator because the activator smelled like acetone. It definitely works on wood but I am pefectly willing to accept the chemical reality that the acetone itself is not the effective ingredient. I can't remember using it on pottery or metal where it was not needed. Since I atomize it am I just mixing it with water vapor?
jpanhalt:
Evaporating acetone cools the wood, which condenses water from the air, unless it is quite dry. Are you sure that is not the mechanism? Sure, there is a tautomer of acetone that shows a hydroxyl group, and acetone can participate in the very well known and common aldol type of reaction. But, that is not the most likely mechanism.
Attachment 1 shows the specifications for technical grade acetone. Water at 0.5% is a lot.
Attachment 2 shows the tautomeric form of acetone with a hydroxyl group.
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