Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Of inorganic materials
Patent
1974-03-11
1979-09-11
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Of inorganic materials
106 3825, 264338, B28B 150
Patent
active
041675495
ABSTRACT:
A parting agent for molds used in forming concrete and method of use comprising an effective amount of an acid, an agent which reacts with free alkali in the cement of the concrete mix to form a multitude of tiny bubbles and a vehicle therefor. The preferred embodiment of the invention includes a weak acid, such as tannic acid, form oil as the vehicle and Vinsol-Resin as the bubble forming agent. The term "Vinsol" will be used herein as a short version for Vinsol-Resin.
The method of use comprises applying a coating of the parting agent to the inner surface of a mold and then delivering a sufficient quantity of concrete mix into the mold, completing the formation (curing) of the concrete in the mold, and then removing the cured concrete (casting). The weak acid in the parting agent neutralizes the free alkali in the cement component of the concrete to prevent the formation of a bond between the concrete casting and the mold surface. The "Vinsol" in the parting agent creates air bubbles at the contacting surfaces of the mold and the concrete casting. The bubbles at said contacting surfaces reduce the frictional resistance between the mold and the casting when the latter is being lifted from the mold.
REFERENCES:
patent: 1468343 (1923-09-01), Delaney
patent: 1568070 (1926-01-01), Jennens
patent: 1637321 (1927-07-01), Johnson
patent: 1893607 (1933-01-01), Zottoli
patent: 2114393 (1938-04-01), Lane
patent: 3188221 (1965-06-01), Matsuda
The Chemistry of Cement & Concrete, F. M. Lea and C. H. Desch, 2nd ed., Edward Arnold Ltd., London, p. 16, 1956.
Chemical Trade Names and Commercial Synonyms, William Haynes, D. Van Nostrand Co. Inc., N.Y., 1952, p. 265.
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