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Epoxy / adhesive for hard plastic (headphone hinge) ?

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amdx
Guest

Wed Apr 29, 2020 8:45 pm   



On 4/19/2020 1:19 AM, Mike S wrote:
Quote:
On 4/14/2020 11:36 PM, Jeff Liebermann wrote:
On Tue, 14 Apr 2020 21:07:38 -0700, Mike S <mscir_at_yahoo.com> wrote:

Loctite Super Glue Plastics Bonding System with Activator 2-Gram
(681925)

Bonds plastics such as Plexiglas, polycarbonate, polystyrene, PVC,
polyethylene, polypropylene and polytetrafluoroethylene (PTFE)/Teflon.
Plus rubber, leather, cork, paper, cardboard, wood, chipboard, fabric,
metal and ceramic.

https://www.amazon.com/Loctite-Plastics-Bonding-Activator-681925/dp/B000Y3LHXW


That's what I use for gluing problem plastics.  Seems to work with all
the hard plastics and some soft (flexible) plastics.  It's a
cyanoacrylate adhesive, with some hexane added to soften the plastic.
Note that it's not very good at filling gap.  With flexible plastics,
it does well if the glue joint is very thin and therefore flexible.
With a thicker glue line, it will crack and eventually crumble.
snip

Jeff,

Thanks again, I tried the Loctite above based on your recommendation and
the price and it worked great, exactly as you said - it is a great glue
for close-fitting parts! I added a 3/4" wide strip of aluminum cut from
a rain gutter and screwed that into place around the joint for extra
support, covered that with black tape, used the headphones several
times, problem solved and it's not too noticeable. Thanks for your
detailed reply.


I visited my daughter last week and her Shark vacuum had broke at the
neck of the beater bar. (something about gravity and a stairway) No real
material to get any screws or pins into it. I used the Super Glue as
listed above, >
https://www.amazon.com/Loctite-Plastics-Bonding-Activator-681925/dp/B000Y3LHXW

to preliminarily hold the parts in position. Then after spending the
time necessary to sand all the areas where I was to apply the two part
epoxy made for plastic. >
https://www.amazon.com/J-B-Weld-50133-Tan-1-Pack/dp/B009EU5ZNO/ref=sr_1_1?crid=NQTCKKXR8MHU&dchild=1&keywords=jb+weld+plastic+bonder&qid=1588186525&s=hi&sprefix=Jb+weld%2Ctools%2C352&sr=1-1


I epoxied as much area as I could. After a full days cure, she vacuumed
the whole house and it survived. I left specific instructions to let me
know if it breaks. If it holds up, I'll call the glue and epoxy winners,
because that is a high stress point of the vacuum.
Mikek

Mike S
Guest

Thu Apr 30, 2020 4:45 am   



On 4/29/2020 12:06 PM, amdx wrote:
Quote:
On 4/19/2020 1:19 AM, Mike S wrote:
On 4/14/2020 11:36 PM, Jeff Liebermann wrote:
On Tue, 14 Apr 2020 21:07:38 -0700, Mike S <mscir_at_yahoo.com> wrote:

Loctite Super Glue Plastics Bonding System with Activator 2-Gram
(681925)

Bonds plastics such as Plexiglas, polycarbonate, polystyrene, PVC,
polyethylene, polypropylene and polytetrafluoroethylene (PTFE)/Teflon.
Plus rubber, leather, cork, paper, cardboard, wood, chipboard, fabric,
metal and ceramic.

https://www.amazon.com/Loctite-Plastics-Bonding-Activator-681925/dp/B000Y3LHXW


That's what I use for gluing problem plastics.  Seems to work with all
the hard plastics and some soft (flexible) plastics.  It's a
cyanoacrylate adhesive, with some hexane added to soften the plastic.
Note that it's not very good at filling gap.  With flexible plastics,
it does well if the glue joint is very thin and therefore flexible.
With a thicker glue line, it will crack and eventually crumble.
snip

Jeff,

Thanks again, I tried the Loctite above based on your recommendation
and the price and it worked great, exactly as you said - it is a great
glue for close-fitting parts! I added a 3/4" wide strip of aluminum
cut from a rain gutter and screwed that into place around the joint
for extra support, covered that with black tape, used the headphones
several times, problem solved and it's not too noticeable. Thanks for
your detailed reply.


 I visited my daughter last week and her Shark vacuum had broke at the
neck of the beater bar. (something about gravity and a stairway) No real
material to get any screws or pins into it. I used the Super Glue as
listed above,
https://www.amazon.com/Loctite-Plastics-Bonding-Activator-681925/dp/B000Y3LHXW

to preliminarily hold the parts in position. Then after spending the
time necessary to sand all the areas where I was to apply the two part
epoxy made for plastic.
https://www.amazon.com/J-B-Weld-50133-Tan-1-Pack/dp/B009EU5ZNO/ref=sr_1_1?crid=NQTCKKXR8MHU&dchild=1&keywords=jb+weld+plastic+bonder&qid=1588186525&s=hi&sprefix=Jb+weld%2Ctools%2C352&sr=1-1



I epoxied as much area as I could. After a full days cure, she vacuumed
the whole house and it survived. I left specific instructions to let me
know if it breaks. If it holds up, I'll call the glue and epoxy winners,
because that is a high stress point of the vacuum.
                              Mikek


Nice! (gravity and a stairway : lol)

amdx
Guest

Sat May 02, 2020 6:45 pm   



On 4/15/2020 1:47 AM, Andy Burns wrote:
Quote:
Mike S wrote:

Loctite sells 2 different adhesives for these two different types of
plastic

Try the 'burn test' to identify the plastic if its type isn't marked on it

https://www.boedeker.com/Technical-Resources/Technical-Library/Plastic-Identification


if it's a low surface energy type, there is Scotchweld DP8005, but it's
not cheap


I've done the burn test, but find I have more confidence if I have a
known sample to compare aroma's.
Mikek

amdx
Guest

Wed May 06, 2020 11:45 am   



For those interested in bonding polypropylene.


> https://www.adhesivesmag.com/articles/97665-polyurethane-adhesive-for-untreated-polypropylene

Mikek

Jeff Liebermann
Guest

Wed May 06, 2020 5:45 pm   



On Wed, 6 May 2020 05:20:38 -0500, amdx <nojunk_at_knology.net> wrote:

Quote:


For those into something more mundane for polypropylene:
<https://www.loctiteproducts.com/en/products/fix/super-glue/loctite_plasticsbondingsystem.html>
"The activator primes hard-to-bond surfaces such as polypropylene
and polyethylene"

<https://dm.henkel-dam.com/is/content/henkel/TDS-681925-US-Loctite-Plastics-Bonding-System-Carded-4-ml-2-g-2016-08-26pdf>
Cyanoacrylate adhesive with Heptane solvent for surface preparation
(activator). I'm rather surprised that it works as most surface
activators (used to increase surface energy and therefore chemical
reactivity of low energy plastics) require elevated temperatures.

One big problem for me has been shelf life. I bought a few tubes of
the stuff from a local hardware store, only to find that it was near
the end of its shelf life. It died in the tube (unopened) a few
months later:
Shelf Life. From date of manufacture (unopened):
30 months Stored at 36-46F
18 months Stored at 68F

I suggest you check the self destruct date when buying:

Lot Code Explanation: #YDDDX Printed on crimped end on tube
# = Disregard
Y = Last digit of year of manufacture
DDD = Day of manufacture based on 365 days in a year
X = Disregard
Example: 6061 = 61st day of 2016 = March 2, 2016

<https://www.homedepot.com/p/Loctite-Plastics-Bonding-System-2g-Super-Glue-681925/100371829>







--
Jeff Liebermann jeffl_at_cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

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