Jump to content


Photo

PHBT Plastics...

chemistry PHBT

  • Please log in to reply
35 replies to this topic

#1 toonces

toonces

    Methuselah

  • Patron
  • PipPipPipPipPip
  • 31605 posts
  • Locationthe atomic city

Posted 14 September 2022 - 10:23 PM

Are there plastics that mix together like acrylics, but are less brittle?  Kind of like PVC pipe?  And have a decently long cure time, so one can work with it sort of like resins for fiberglass?

 

 



#2 Dave McG

Dave McG

    Frequent Member

  • Patron
  • PipPipPipPip
  • 8365 posts
  • LocationChicago

Posted 14 September 2022 - 10:32 PM

Would epoxy do the job? JB Weld is hard & brittle, but plain two part mixtures are not.

#3 toonces

toonces

    Methuselah

  • Patron
  • PipPipPipPipPip
  • 31605 posts
  • Locationthe atomic city

Posted 14 September 2022 - 10:36 PM

Don't want it to be brittle.

 

And I'm looking at Fiberglas size job.  Like 10-15 square feet.  Want it to be about 1/4" thick.


Edited by toonces, 14 September 2022 - 10:37 PM.


#4 Dave McG

Dave McG

    Frequent Member

  • Patron
  • PipPipPipPip
  • 8365 posts
  • LocationChicago

Posted 14 September 2022 - 10:40 PM

https://www.westsyst...epoxy-adhesive/

#5 Patrick C.

Patrick C.

    Comproller of Toilet Tank Vodka

  • Patron
  • PipPipPipPip
  • 8131 posts
  • LocationAcworth GA

Posted 14 September 2022 - 10:47 PM

You want to cast something, and then be able to work it before it sets? There are slow setting epoxies for casting- I imagine that you could pop it out of the mold while still soft and deform it.

#6 toonces

toonces

    Methuselah

  • Patron
  • PipPipPipPipPip
  • 31605 posts
  • Locationthe atomic city

Posted 14 September 2022 - 11:07 PM

You want to cast something, and then be able to work it before it sets? There are slow setting epoxies for casting- I imagine that you could pop it out of the mold while still soft and deform it.

Not necessarily work it, just a long set time because it's not going to be small, and it's likely going to be just me doing it.

 

This looks really close, if not it.  In the vein of some of the boat and canoe projects.



#7 Brian72

Brian72

    Peter Freer

  • Patron
  • PipPipPipPipPip
  • 40115 posts
  • LocationYour mom

Posted 14 September 2022 - 11:31 PM

An actual fiberglass kit with the cloth and resin wouldn’t work?

#8 dondewey

dondewey

    Frequent Member

  • Members
  • PipPipPipPip
  • 9487 posts
  • LocationVA

Posted 14 September 2022 - 11:36 PM

Epoxies are the obvious answer, but also consider urethanes:

https://www.fibregla...Learning_Center

#9 BlackBeerd

BlackBeerd

    Comptroller of Stain's Junk Posting

  • Members
  • PipPipPipPipPip
  • 18184 posts
  • LocationA Drunken Stupor

Posted 15 September 2022 - 05:49 AM

Everything you could ever need.

 

https://www.smooth-on.com/



#10 Hines

Hines

    Comptroller of Emus

  • Members
  • PipPipPipPip
  • 9265 posts

Posted 15 September 2022 - 05:54 AM

so what is the actual project?



#11 Dave McG

Dave McG

    Frequent Member

  • Patron
  • PipPipPipPip
  • 8365 posts
  • LocationChicago

Posted 15 September 2022 - 06:25 AM

Not necessarily work it, just a long set time because it's not going to be small, and it's likely going to be just me doing it.

This looks really close, if not it. In the vein of some of the boat and canoe projects.

West System has several other variations. The G-flex I linked is made to be flexible, and I've seen people use thickened versions of it to mold parts.

#12 davelew

davelew

    Comptroller of ACMSO That Are Not Beans

  • Members
  • PipPipPipPipPip
  • 17500 posts
  • LocationReading, Massachusetts

Posted 15 September 2022 - 06:46 AM

Epoxies are the obvious answer, but also consider urethanes:

https://www.fibregla...Learning_Center

 

Yeah, polyurethane was my first thought after epoxy.  It's pretty commonly applied to large projects like floors.



#13 toonces

toonces

    Methuselah

  • Patron
  • PipPipPipPipPip
  • 31605 posts
  • Locationthe atomic city

Posted 15 September 2022 - 01:08 PM

so what is the actual project?

https://www.groundfridge.com/

 

They don't sell in the US, and shipping would kill me.


An actual fiberglass kit with the cloth and resin wouldn’t work?

Don't think it would be strong enough.


Edited by toonces, 15 September 2022 - 01:08 PM.


#14 SnowMan

SnowMan

    Advanced Snowman

  • Patron
  • PipPipPipPipPip
  • 12740 posts
  • LocationWinter...

Posted 15 September 2022 - 05:03 PM

Isn't that just a root cellar? I don't see anything special any that that you can't get by burying your standard big frp tank. They just make it easy

#15 Hines

Hines

    Comptroller of Emus

  • Members
  • PipPipPipPip
  • 9265 posts

Posted 15 September 2022 - 06:18 PM

That’s what I was thinking, use large water reservoir and cut to shape.

#16 Patrick C.

Patrick C.

    Comproller of Toilet Tank Vodka

  • Patron
  • PipPipPipPip
  • 8131 posts
  • LocationAcworth GA

Posted 15 September 2022 - 06:27 PM

 and shipping would kill me.


 

 

 

Where have we heard that before?  :)



#17 Patrick C.

Patrick C.

    Comproller of Toilet Tank Vodka

  • Patron
  • PipPipPipPip
  • 8131 posts
  • LocationAcworth GA

Posted 15 September 2022 - 06:32 PM

You trying to cast the whole thing, or joining sections together?  



#18 toonces

toonces

    Methuselah

  • Patron
  • PipPipPipPipPip
  • 31605 posts
  • Locationthe atomic city

Posted 15 September 2022 - 07:39 PM

With that inner diameter, the volume is ~1650 gallons.  I've yet to find any spherical FRP's that volume.  Even if I did, there's the issue of getting in and out.  Most other underground water tanks tell you to not let the volume get below ~1/3 of the volume, otherwise the weight of the dirt will cause it to collapse.

 

 

You trying to cast the whole thing, or joining sections together?  

Do sections around a bisector of the sphere, along the axis of the stairs.



#19 dondewey

dondewey

    Frequent Member

  • Members
  • PipPipPipPip
  • 9487 posts
  • LocationVA

Posted 15 September 2022 - 08:01 PM

Guy I work with put an 8 foot diameter metal culvert underground for his wine cellar. It looked fantastic after he finished it.

#20 toonces

toonces

    Methuselah

  • Patron
  • PipPipPipPipPip
  • 31605 posts
  • Locationthe atomic city

Posted 15 September 2022 - 08:07 PM

Do sections around a bisector of the sphere, along the axis of the stairs.

Similar to this...  With fiberglas, or maybe woven poly like what malt comes in.

 

northcanoes1.jpg





Also tagged with one or more of these keywords: chemistry, PHBT

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users