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 Post subject: Acrylic to metal bond
PostPosted: Nov Thu 20, 2014 9:15 pm 
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Joined: Jun Sat 30, 2012 9:26 pm
Posts: 1508
Location: Miami,Fl
I hope this is in the right section. I'm trying to create a strong bond between a 1/2 ton arbor press and a piece of 1/4" plexiglass/acrylic. If you have to ask why, I'll gladly explain.

Simply, I tried to glue a piece of 2"x2" piece of acrylic to the press arbor with JB Weld. I've cleaned everything with both 90% alcohol and followed by acetone. Both the arbor and the the plexigalss attachment point was heavily scored with 3M 431Q sandpaper for a good bond. The curing process was aided with a halogen bulb for 6 hours and allowed to cure 24 hours. Before adding buttressing fillets to the existing bond, the plexiglass just fell off with a slight push. The JB weld is new and fresh.

This stuff has been miraculous in past repairs. I'm perplexed why this won't bond.

Any thoughts or suggestions to bond steel to a piece of plexiglass.

If you have to know, it's an attempt to soften/massage polymer clay for craft projects.

Don't dismiss this. I've replicated unobtnium physical parts with this stuff and it needs to be recognized as an alternative source of replication


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 Post subject: Re: Acrylic to metal bond
PostPosted: Nov Thu 20, 2014 10:51 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1930
Location: Baldwin Park/Fallbrook Ca.
Gorilla glue?
I have had good luck with this stuff, it is not recommended polyethylene or polypropylene plastics.
I am not sure if plexiglass is made out of the above.
bill

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 Post subject: Re: Acrylic to metal bond
PostPosted: Nov Fri 21, 2014 7:36 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1348
Location: Butte, MT USA
My favorite glue site:

http://www.thistothat.com/

... but it sounds like you did everything they advise...


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 Post subject: Re: Acrylic to metal bond
PostPosted: Nov Tue 25, 2014 3:06 pm 
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Joined: Jan Mon 16, 2012 12:20 am
Posts: 3
RTV- automotive gasket maker. The black stuff will hold it, just clean the surface with alcohol.


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 Post subject: Re: Acrylic to metal bond
PostPosted: Nov Tue 25, 2014 9:03 pm 
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Joined: Feb Sat 16, 2013 12:23 pm
Posts: 189
Location: Cape Town RSA
Hi

I think it could be the acetone. I keep the stuff in my workshop but only for superglue removal.

Acetone always leave a whiteish film over many plastics and even metal.

Can you try again sans acetone?

dauphine

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 Post subject: Re: Acrylic to metal bond
PostPosted: Nov Fri 28, 2014 6:00 am 
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Joined: Jun Sat 30, 2012 9:26 pm
Posts: 1508
Location: Miami,Fl
I re-cleaned the acrylic pieces with acetone and got the white hazing. Also redid the scoring with the sandpaper and aggressive SS brush on the bottom of the arbour shaft metal as well. This seems to work with a rock hard bond with heat and reapplication with side fillets for a stronger support over 36 hours. So far this works. I'm going to upload photos soon. Everything so far is working fantastically.


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 Post subject: Re: Acrylic to metal bond
PostPosted: Dec Tue 02, 2014 1:23 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3977
Location: NJ, 07645
I have used polyurethane glue to glue HDPE to steel on my table saw and the bond lasts several years before it fails. That is with constant clamping and unclamping pressure on the glue joint. HDPE is very difficult plastic to bond. The polyurethane glue is available in any hardware store in small bottles.


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