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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.
中级
Half a day
说明
1
1
Weigh 8 : 3 : 3
Weigh 8 : 3 : 3
Weigh 8 parts PVC resin, 3 parts tricresyl phosphate and 3 parts dibutyl phthalate.
此步骤所需材料：
PVC 树脂8 parts
磷酸三甲苯酯3 parts
邻苯二甲酸二丁酯3 parts所需工具：
等臂天平2
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.
所需工具：
不锈钢大锅
油浴
电热板
搅拌器
实验室温度计
通风柜（带排风管）
耐热手套
化学防溅护目镜3
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.
所需工具：
晾饭木盘耐热手套4
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.
所需工具：
造粒机
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