Polyurethane Foam Powerpoint.ppt - Wikispaces

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					Polyurethane Foam
                  Reactants

HO-R-OH (Polyether polyol) 0=C=N-R’-N=C=O
(diisocyanate)


[-O-R-O-C-N-R’-N-C-] (polyurethane)
                     Products
HO-R-OH (Polyether polyol) + 0=C=N-R’-N=C=O
(diisocyanate)
                               =
[-O-R-O-C-N-R’-N-C-] (polyurethane)
Type of Chemical Reaction:




COMBUSTION
                Materials Needed:
-Polyester Polyol (Part A) from Industrial Arts
-Polyfunctional Isocyanate (Part B) from Industrial Arts
-Desmodur and Desmophen
-600 mL beakers (2)
-Food Coloring
-Gloves
-goggles
-plastic cups
- glass stirring rods
-paper towels
-aprons
                 Safety Precautions
1. Polyurethane foam is a by- product of the same process that is used to make
petroleum. It is highly flammable.

2. Polyurethane foam ignites easily and burns rapidly. It should be kept away
open flames and sparks.

3. When it burns, polyurethane releases a great amount of heat and toxic
fumes.

4. Burning polyurethane can cause suffocation in a poorly ventilated area.

5. Polyfunctional isocyanate and polyester polyol should be handled with
gloves.

6. DO NOT INGEST THE POLYURETHANE FOAM – some foams have
flame retardant additives that can be toxic if ingested. Whether or not
the foam you are working with contains them, it should not be ingested
or even placed in the mouth. (JUST LIKE ANY OTHER
CHEMICAL!)
   Polyurethane Foam Procedure
(1) Remember that polyurethane is flammable and should not be
brought near
an flame.
(2) Wear gloves when handling the chemicals.
(3) Place approximately 20mL of each chemical, the polyester
polyol and
polyfunctional isocyanate, into a large cup.
(4) Observe the viscosity and volumes of each chemical. Record
your
observations.
(5) Add food coloring to create colored foam.
(6) With a stirring rod, mix the contents thoroughly.
(7) Feel the cup for temperature change. Record your
observation.
(8) When the foam begins to expand, stop stirring.
(9) Observe the color, texture, temperature and volume of the
foam once the
reaction stops. Record your observations.
Michael, Anthony, and Steven
 Anthony typed it, and Michael and Steven
 looked up the information on the
 experiment.

				
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posted:3/1/2012
language:Latin
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