Water-based die-casting release agent for aluminum alloy casting

Abstract

The invention discloses a water-based die-casting release agent for aluminum alloy casting, and relates to the technical field of release agents. In parts by weight, the water-based die-casting release agent comprises the following components: 12 to 18 parts of dimethyl silicone oil, 30 to 45 parts of hydroxyl silicone oil, 5 to 9 parts of liquid paraffin, 4 to 10 parts of an emulsifier, 120 to 150 parts of water, 1 to 3 parts of isopropanol, 0.8 to 2.1 parts of urea, 0.3 to 0.8 part of benzoic acid, 1.0 to 1.6 parts of borax, 1.5 to 3.2 parts of a composite porous filler and 0.1 to 0.3 part of a defoaming agent. According to the water-based die-casting release agent for the aluminum alloy casting provided by the invention, the prepared composite porous filler is introduced into a conventional release agent system, the composite porous filler can effectively improve the high-temperature molding property of the release agent, a complete isolating membrane without obvious pores can be formed under a high-temperature condition, and a casting prepared by spraying the composite porous filler to a mold and demolding is few in pores, smooth and clean in surface and free of carbon deposition, and the smoothness and integrity of the casting are improved.

Description

technical field [0001] The invention belongs to the technical field of release agents, and in particular relates to a water-based die-casting release agent for aluminum alloy casting. Background technique [0002] Die-casting release agent, also known as release agent, is an auxiliary agent that isolates the mold and the casting during the casting molding process. It can effectively prevent or reduce the mechanical damage of the molded casting when it is released from the mold. It plays an indispensable role in improving the appearance quality of castings and prolonging the service life of molds. [0003] The rapid development of the die-casting market has naturally led to a large demand for release agents. The mold release agent is an essential auxiliary agent for the production of metal die-casting products. Its main function is to help the metal die-casting products to be removed from the mold, and to maintain the integrity and post-processing of the products. In the di...

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Problems solved by technology

[0004] For example, Chinese patent CN2017107692172 discloses a water-based release agent and a preparation method thereof, the water-based release agent includes stearate, iron oxide red, xanthan gum, sodium bentonite, sodium hexametaphosphate, defoamer , adhesives, preservatives and water; the water-based release agent uses tap water as the carrier of the release agent, and the water-based release agent can significantly reduce the adhesion of the type and core to the mold and the demoulding resistance, ensuring the type and core. Integrity rate, increasing the mold release life cycle; however, when this type of water-based release agent is used, when the water comes into contact with the mold, intense atomization will occur, causing the sprayed release agent to evaporate on the surface of the mold, and its active ingredients cannot Deposited on the surface of the cavity, the release agent cannot form a complete isolation film on the surface of the cavity, and with the intense atomization of the water in contact with the mold, the formed water vapor will escape from the isolation film, thereby Causes porosity in the separator, which leads to adhesion and durability of the separator, resulting in easy peeling of the separator