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Flexible PVC Compound: PVC Dissolved Hot in Tricresyl Phosphate and Dibutyl Phthalate
Flexible PVC was Waldo Semon's discovery at B. F. Goodrich (US 1,929,453, 1933): hard PVC dissolved at high temperature in a non-volatile liquid sets on cooling into a tough, rubbery solid. His gasoline-resistant composition is 8 parts PVC, 3 parts tricresyl phosphate and 3 parts dibutyl phthalate; more plasticiser makes it softer. It can be moulded and extruded, and he names insulating electric wire and lining hose among its uses. Cutting it into pellets is our step.
The picture: our diagram.
Intermediate
Half a day
Instructions
1
1
Weigh 8 : 3 : 3
Weigh 8 : 3 : 3
Weigh 8 parts PVC resin, 3 parts tricresyl phosphate and 3 parts dibutyl phthalate.
Materials for this step:
PVC Resin8 parts
Tricresyl Phosphate3 parts
Dibutyl Phthalate3 partsTools needed:
Balance Scale2
2
Dissolve hot
Dissolve hot
Heat and stir the mixture to about 180 °C (the temperature the patent gives for its other compositions) until it is one homogeneous liquid. Work under a hood.
Tools needed:
Large Stainless Steel Pot
Oil Bath
Hot Plate
Stirrer
Thermometer - Lab
Fume Hood (Ducted)
Heat-Resistant Gloves
Chemical Splash Goggles3
3
Cool to a rubbery solid
Cool to a rubbery solid
Pour it out and let it cool: it sets to a stiff, rubbery gel. More plasticiser gives a softer, more stretchy product; less gives a harder, stronger one.
Tools needed:
Rice Cooling TrayHeat-Resistant Gloves4
4
Cut into pellets
Cut into pellets
Ours: cut the cooled compound into pellets for the extruder. The patent extrudes the compound, for example as insulation around wire.
Tools needed:
PelletizerMaterials
3- 8 partsPlaceholder
- 3 partsPlaceholder
- 3 partsPlaceholder
Tools Required
11- Placeholder
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