Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1978-10-12
1980-09-09
Pertilla, Theodore E.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
106308M, 260 38, C08L 6110
Patent
active
042216893
ABSTRACT:
A suspension of novolac resin is first produced by dissolving phenol in an queous formaldehyde solution and the addition of an acid catalyst, followed by heating and refluxing. The hot novolac suspension is diluted with water and then converted into a solution by the addition of alkali hydroxide solution bringing the pH value to the range from 10 to 13. While the solution is still hot, particles of some form of carbon are suspended therein by mixing, vibration, or other agitation and the suspension is fed at 60.degree. C. into acidulated water of a temperature of about 50.degree. C., with the flow of acidulated water and suspension adjusted for a volume ratio of, respectively, 8:1. The resin is thereby precipitated on the surface of the particles and the particles are filtered, washed, and dried to produce a material made up of fine grains, evenly coated with binder, which are useful for making graphitic molds for casting metal.
REFERENCES:
patent: 3106540 (1963-10-01), Freedman
patent: 3709849 (1973-01-01), Herbert et al.
patent: 4023979 (1977-05-01), Luhleich
Dias Francisco J.
Luhleich Hartmut
Kernforschungsanlage Julich Gesellschaft mit beschrankter Haftun
Pertilla Theodore E.
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