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wahid212
Active Contributor

Join Date: May 2007
Posts: 15

SOFTENING OF POLYURETHANE FOAM

09/07/2009 1:39 AM

WE USE POLYURETHANE FOAM FOR INSULATION IN REFRIGERATOR.

CHEMICAL USED IS : ELASTOPOR MH 1031 C-A (4,4 DIPHENYLMETHANE DIISOCYANATE(MDI)

: LUPRANAT M20 S (POLYOL)

: CYCLO PENTANE(BLOWING AGENT)

SOMETIMES SHAPE OF OUTER BODY OF THE REFRIGERATOR BECOMES IRREGULAR DUE TO NON UNIFORM FLOW OF THE ABOVE FOAMING CHEMICALS.

IS THERE ANY SOLUTION TO SOFTEN THE RIGID FOAM FOR REMOVING FROM THE REJECTED CABINETS.
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lyn
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Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#1

Re: SOFTENING OF POLYURETHANE FOAM

09/07/2009 3:22 AM

Methylene chloride. Methyl ethyl ketone. Hexafluoroacetone sesquihydrate.

Electric carving knife.
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aurizon
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Join Date: Jun 2006
Location: Toronto
Posts: 3968
Good Answers: 120
#2

Re: SOFTENING OF POLYURETHANE FOAM

09/07/2009 10:41 PM

You need to foam the cavity with an inner and outer lining, so that nothing can make bumps on the surface. Then the urethane must be a little slower curing, so it stays more flexible and flows into all the crevices and is a uniform foam.

A friend of mine makes fridges this way. The inner lining and outer shell are foamed en-situ with removable bracing.

Rapid refrigeration.

http://www.rapidfridge.com/home.html

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s.udhayamarthandan
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Join Date: Feb 2009
Location: Tamilnadu, India
Posts: 836
Good Answers: 42
#3

Re: SOFTENING OF POLYURETHANE FOAM

09/08/2009 3:08 AM

Try solvents like ethyl / butyl acetate[ ester solvents], ketone based solvents like MEK OR ACETONE , using a pad or fabric to soak out the hard resin solublize it and remove by gentle scratching.

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Daddio926
Commentator

Join Date: May 2008
Location: St. Paul , MN
Posts: 79
Good Answers: 6
#4

Re: SOFTENING OF POLYURETHANE FOAM

09/08/2009 8:42 AM

As a urethane molder my favorite chemicals for removing unwanted resin are from http://www.dynaloy.com/Products/urethane_products.html Dynaloy.
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