Carbon paste and process for its manufacture

Details Carbon paste and process for its manufacture Carbon paste and process for its manufacture

1985-03-04

1986-09-23

Hayes, Lorenzo B.

Compositions: coating or plastic

Coating or plastic compositions

Bituminous material or tarry residue

204294, 252510, C08L 9500

Patent

active

046133755

ABSTRACT:
A carbon paste for self-calcining electrodes, refractory linings and connections of electrode joining points contains as binder bitumen comprising 70-90 wt-% hard bitumen and 10-30 wt-% soft bitumen. To increase the dry residue of the bitumen and to improve the burning-off properties of the mass, 0.3-2 weight percent of additives can be added, in particular Al, Al.sub.2 O.sub.3, B, B.sub.2 O.sub.3, Si and/or SiO.sub.2. The production of the carbon paste is such that the solid fraction is mixed at 130.degree.-180.degree. C. to a homogeneous mass then the hard bitumen, followed by the soft bitumen added slowly in a highly fluid form accompanied by intensive stirring. The paste is then intensively mixed further and cooled after removing from the mixer.

REFERENCES:
patent: 3303119 (1967-02-01), Dell
patent: 3442787 (1969-05-01), Landrum et al.
patent: 4116708 (1978-09-01), Tarver et al.
patent: 4264371 (1981-04-01), Dell

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