Does Benzidine polymerize in presence of alcohol?

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SUMMARY

This discussion revolves around the challenges faced by a hobbyist attempting to repair a laser level that lost fluid from its bubble vial. The user initially used 91% isopropyl alcohol to flush the vial, which led to the failure of JB Weld epoxy due to its solvent properties. Subsequent attempts with hot glue and denatured alcohol resulted in further complications, including the creation of a gooey paste. The user ultimately discovered that the dye used may be Benzidine-based, which is now being outlawed due to its carcinogenic properties.

PREREQUISITES
  • Understanding of epoxy adhesives, specifically JB Weld
  • Knowledge of the properties and uses of isopropyl alcohol and denatured alcohol
  • Familiarity with the chemical structure and risks associated with Benzidine
  • Basic skills in DIY repairs and material compatibility
NEXT STEPS
  • Research the chemical properties and risks of Benzidine and its alternatives
  • Explore the compatibility of various adhesives with solvents
  • Investigate the use of smartphone apps for leveling tools
  • Learn about the restoration techniques for vintage machinery and tools
USEFUL FOR

This discussion is beneficial for hobbyists, DIY enthusiasts, and anyone interested in the chemistry of adhesives and dyes, particularly those involved in restoring or repairing mechanical devices.

jim hardy
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This is a hobbyist question, i hope you'll entertain it.

Have a laugh on me, guys. One of my psychological quirks is i just hate to see a nice piece of machinery junked. I try to rescue too many of them. Runs in the family, my Grandmother rescued stray dogs.

...I found my laser level has lost the fluid from one of its little bubble leveling vials.
http://www.geier-bluhm.com/images/3-0505.JPG
So i drilled a tiny hole in one end and flushed it with rubbing alcohol, 91% isopropyl delivered through an insulin syringe.
Next i mixed some really old green fabric dye with isopropyl and filled the vial. I sealed the end with hobbyist epoxy, JB weld.
Looked great, i was so proud of myself.
Well- the next evening that dye was thick as honey . Looking into what went wrong i noticed the JBweld site says "clean the surfaces. Do not use alcohol."
Uh oh - I figured the alcohol must've been a solvent for the epoxy before it set up.
So i got the old stuff out , refilled the vial and sealed it this time with hot glue, first testing to make sure alcohol didn't soften the hot glue.
Again it set up but this time after two days. It went to a gel that wouldn't flush with isopropyl.
So i figured maybe denatured alcohol would work better to flush it.
Well ! Denatured immediately turned it into a white gooey paste, consistency of nearly dry white paint.

Using the home handyman's philosophy of "Get a bigger hammer" i found my stash of acetone.
Acetone got the goop out but the acrylic vial cracked and fell apart.

Well, just to find the error of my ways i researched vintage Putnam brand dyes and found they're probably Benzidine based and as we speak are being outlawed for their carcinogenic proclivity..

Searching on 'Benzidine polymer alcohol' took me to a lot of chemistry articles for which i simply lack vocabulary..
And a patent for automotive paint pigment.

Did i re-invent Nylon or something?

To conclude this sad story : I've found replacement vials for 75 cents plus eleven dollars shipping. Or i can get a whole new laser level on sale at Sears for $32.
It is difficult to turn loose of eleven bucks to ship a 75 cent item.
But the same outfit makes this beautiful machinist's level...it'd really dilute that shipping cost.

http://www.geier-bluhm.com/images/004.JPG

Ahhh, 'tis a fine madness !

Hope this post doesn't lower the PF standards too much. I was curious what happened...
Feel free to move to general discussion thread...

old jim
 
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You have a very complicated organics collection there. I can't help with the polymerisation of benzedrine, but I had assumed that the green / yellow colour was ethylene glycol (= antifreeze) in denatured ethanol / isopropyl. But actually Fluorescein seems to be used as the colouring. The fluid in some cheap bubble levels now becomes clear when exposed to sunlight, maybe they are glycol based? That loss of colour also happens to the colouring in some dish washing detergents.

There may be some advantage in experimenting with blends of Absinthe or Chartreuse. The bubbles for levels are still available from the usual suppliers.
 
Thanks Baluncore.. I'm no chemist.

Someplace i have a tiny little jar of Florescein .
But, i need a 25 X 10 mm bubble tube now. Will surely run across one someplace.
Next time i'd use Easter egg dye.
thanks, old jim
.
 
jim hardy said:
One of my psychological quirks is i just hate to see a nice piece of machinery junked. I try to rescue too many of them. Runs in the family, ...

I don't think it a quirk. You're just being an engineer. :D But it does run in the family, from my experience. ;)

Using the home handyman's philosophy of "Get a bigger hammer" i found my stash of acetone.
Acetone got the goop out but the acrylic vial cracked and fell apart.

When I try to restore something and make it worse, there's usually a lot of WTFs. I do talk to inanimate objects. :L

... I've found replacement vials for 75 cents plus eleven dollars shipping. Or i can get a whole new laser level on sale at Sears for $32.
It is difficult to turn loose of eleven bucks to ship a 75 cent item.

Having this "psychological quirk" means you'll pay the $11 shipping cost. After all, the rescue is precious. :cool:
 
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jim hardy said:
But, i need a 25 X 10 mm bubble tube now. Will surely run across one someplace.
Hey Jim, I'm just a bit concerned that you are willing to spend hours of labor on a ten cent device. I'd send a bottle of wine or a six of beer if you prefer in hopes that you will find it more useful than the bubble level, but the lady at the post office told me it costs $11 for shipping. :L

Did you know you can turn your smart phone into a bubble level? There's an app for that...
 
dlgoff said:
Having this "psychological quirk" means you'll pay the $11 shipping cost. After all, the rescue is precious. :cool:

Uh-oh I'm found out... will probably buy a $75 machinst's level to calibrate the 75 cent plastic one, too ...

Q_Goest said:
Did you know you can turn your smart phone into a bubble level? There's an app for that...
Hmmm ... would that involve a computer ? ... well, considering my signature line ...