Aqueous silicone emulsion having utility as a mold release
AssigneeDow Corning Toray Silicone Co., Ltd.
InventorsTsutomu Naganawa, Isao Ona
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Abstract
There is disclosed a novel silicone emulsion useful as a mold coating in aluminum die casting operations. The silicone emulsion of the invention comprises an aqueous dispersion of an organopolysiloxane of a particular general formula in combination with an alkyl diphenyl ether disulfate salt. The novel silicone emulsion of the invention exhibits stability even when diluted tens of times and subjected to mechanical shear. When applied to a heated mold surface, water is driven from the silicone emulsion and there is formed a oil film. The oil film allows for easy release of the cast part. Furthermore, the film exhibits good paintability and lubricity under extreme pressure.
Claims8
A silicone emulsion composition consisting essentially of:
- (A) an aqueous emulsion of an organopolysiloxane, said oragnaopolysiloxane having the general formula:
- ##STR9## wherein R.sup.1 is selected from the group consisting of monovalent hydrocarbon radicals having one to seven carbon atoms;
- and combinations thereof;
- R.sup.2 is selected from the group consisting of
- a monovalent hydrocarbon radical having eight or more carbon atoms;
- a monovalent hydrocarbon radical of the general formula --R.sup.3 COOR.sup.4 wherein R.sup.3 is a divalent hydrocarbon radical and R.sup.4 is hydrogen or a monovalent hydrocarbon radical;
- a monovalent hydrocarbon radical of the general formula --R.sup.3 OOCR.sup.5 wherein R.sup.3 is a divalent hydrocarbon radical and R.sup.5 is a monovalent hydrocarbon radical;
- and combinations thereof;
- A is a radical selected from the group consisting of
- hydroxyl radicals;
- monovalent hydrocarbon radicals;
- radicals of the general formula --R.sup.3 COOR.sup.4 wherein R.sup.3 and R.sup.4 are as described above;
- radicals of the general formula --R.sup.3 OOCR.sup.5 wherein R.sup.3 and R.sup.5 are as described above;
- and
- combinations thereof;
- x is an integer between 1 and 50, inclusive;
- y is an integer between 10 and 450, inclusive;
- and
- x<y;
- and
- (B) an alkyl diphenyl ether disulfonate salt;
- and
- said component (B) being present in said composition in the range of 0.2-10 parts by weight, with respect to 100 parts by weight of said organopolysiloxane of component (A).
Dependencies are inferred from the claim text.