Bonding of Glass/Carbon filled Nylon

[biglaw22]

Hello,
I am new to the forum and the world of plastics. I have a part with some complex geometry that caused me to remove some features from the mold. These features will be molded separately and attached (hopefully right after molding). Material is 40% carbon or 40%glass fill.What are the preferred methods for bonding carbon or glass filled nylons.

Thanks

 

[Demon3]

I am not an expert on that topic so if for example Pat or Pud chime in, listen to them over me.

My instinct would be vibration or ultrasonic welding as they melt the plastic parts together to make a strong bond (better than glue for example).

Screws/bolts could work but then you have weak points where you made holes.

Chris DeArmitt PhD FRSC CChem

http://www.phantomplastics.com

Consultant to the plastics industry

 

[MikeHalloran]

The traditional bonding agent is phenol. ... but it's nasty stuff to have around. Consider instead a purely mechanical joint, e.g. a snap fit.



Mike Halloran
Pembroke Pines, FL, USA

 

[patprimmer]

Formic acid works well and is nasty but not as nasty as phenol.

The 40% filler, especially carbon as it is light and therefore displaces more volume makes it harder due to lack of resin to dissolve.

Cyano methacrylates (Super Glue) works with moderate strength. It is OK if the joint is well designed, like if it is already a dowelled joint or dovetail so the glue just supports it.

Ultrasonic or vibration welding can work, depending on part geometry.

Of course bolts, screws or snap fits all work, depending on part geometry.

If you have a shop that supplies winch handles for yachts, The Titan or Lewmar plastic handles are ultrasonic welded together with extra support by through bolts at the critical points on the longer handles. The twin grip long handle would be wrth your while to inspect in detail if you can.

Regards
Pat
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