High temperature heat-resistant oil-based release agent, high temperature heat-resistant electrostatic application-type oil-based release agent, and application method therefor
An oil-based release agent of the present invention contains a petroleum-based hydrocarbon solvent (a) and a high temperature adhesive (b), is applied to a metal die used for die casting or casting, has high adhesion and high lubricity even with respect to a metal die at a high temperature particularly of 300° C. or higher, and can prevent seizure. In addition, the present invention provides a method for applying the oil-based release agent of the present invention by controlling an adhesion amount thereof by micronization and speed-control thereof with respect to a metal die at a high temperature, and an electrostatic application method.
1. An oil-based release agent comprising
a petroleum-based hydrocarbon solvent (a),
an adhesive (b), wherein adhesive (b) is dimethyl polysiloxane having a weight average molecular weight of 100,000 or more, and
a conductive modifier (f), wherein the conductive modifier (f) is at least one selected from the group consisting of
an imidazolium salt (f-1),
a pyrrolidinium salt (f-2),
a pyridinium salt (f-3),
a phosphonium salt (f-5), and
a sulfonium salt (f-6);
wherein the release agent contains 0% water.
2. The oil-based release agent according to claim 1 , wherein the petroleum-based hydrocarbon solvent (a) is at least one selected from the group consisting of
a paraffinic hydrocarbon solvent,
an olefinic hydrocarbon solvent,
a naphthenic hydrocarbon solvent, and
an aromatic hydrocarbon solvent.
3. The oil-based release agent according to claim 1 , further comprising a lubricating additive (c) containing at least one selected from the group consisting of
a mineral oil (c-1),
animal and vegetable fat and oil and a fatty acid ester (c-2),
an organic molybdenum compound (c-3), and
an oil-soluble soap (c-4).
4. An electrostatic-spraying oil-based release agent comprising
a petroleum-based hydrocarbon solvent (a) and
a conductive modifier (f), wherein the conductive modifier (f) is at least one selected from the group consisting of
an imidazolium salt (f-1),
a pyrrolidinium salt (f-2),
a pyridinium salt (f-3),
a phosphonium salt (f-5), and
a sulfonium salt (f-6);
wherein the electric resistance is 3 to 400 MΩ.
5. The electrostatic-spraying oil-based release agent according to claim 4 , further comprising a lubricating additive (c) containing at least one selected from the group consisting of
a mineral oil (c-1),
animal and vegetable fat and oil and a fatty acid ester (c-2),
an organic molybdenum compound (c-3), and
an oil-soluble soap (c-4).
6. A method for applying an oil-based release agent, comprising applying the oil-based release agent according to claim 1 to a metal die at a particle speed of 2 to 50 m/s so as to have a mist diameter of 0.1 to 60 μm.
7. A method for electrostatically applying an electrostatic-spraying oil-based release agent, comprising applying the electrostatic-spraying oil-based release agent according to claim 4 to a metal die.