bonding neoprene drive belt

[ajonline]

I am looking for an adhesive to bond a neoprene extrusion into an "endless loop" drive belt. The extrusion is cut to length and will be bonded using an aramid fiber reinforcing braid in the center. The ends are spliced together to creae the loop. Needs to cure quick (elevated temp), withstand flex and mild heat buildup. thx in advance....

 

[berti]

Hi,
quite often it is good choice to use a thin slice of the uncured compound used to make the profile, maybe a bit softer or made more sticky by some hydrocarbon or tackifier phenolic resin. Fit and cure in a suitable simple mold.
Next is a solution of the compound in a suitable solvent - naphta or toluene- dip or brush on the ends, let solvent go and handle as above mentioned. Finally you could try a rubber-metal adhesive suitable for your polymer, apply it on both sides and proceed as given by the producer.But some of them tend to become hard and inelastic ...
Finally for CR try a so-called contact glue as it is used for e.g.shoe repair. It is basically dissolved CR.

HTH Berti

 

[ajonline]

thx Berti. Actually very helpful and similar to some advice from a rubber compounder I've been using. He has given me 2 slabs - parts A and B that he recommends dissolving in MEK and then mixing together into a paste for bonding. One problem is actually dissolving the slab material into a paste. I've tried cutting the material into small pieces but they don't "dissolve" in the solvent, just get soft. Any suggestions on how to mix (small workshop environment)?

I've tried two part epoxies (too brittle) and am currently evaluating contact cements and a single part urethane(s). I need to be able to cure quickly and withstand mid-200 deg F. These requriements are making it difficult to find a suitable contact cement (temperature).

 

[berti]

Hi, this is berti back,
probably the compounder did not tell you what he gave you ?

There can be basically two reasons if material does not dissolve. Most probably MEK is not the right solvent, try any aromatic like toluene or xylene. The other possibility is that the adhesive compound is so quick that it is already scorched ( that is maybe why he gave you A and B ?).

Berti

 

[Glueguy]

The two materials I would have you try are:
1. Compounded Neoprene contact adhesive
2. Polyurethane Reactive PUR

The Neoprene contact adhesive is flammable, but will probably take the heat. The PUR will also give you excellent bonding power w/ flexibility and quick cure.

I hope that I've helped

John Schrock

http://www.glubie.com

 

[ajonline]

thanks John,
I've glanced at the website but don't see exactly the adhesives you're recommending. Have I just missed them? I'm currently using a contact urethane adhesive. It seems to work pretty well, but gets soft/spongy in the mid 200 deg F range.

AJ