Powderlike mold-releasing agent for die-casing

Abstract

The invention discloses a powdery release agent for die casting, which is composed of component A and component B with particle diameter n<=10 mu m, in which, the component B is one or more of polyethylene, polypropylene, polyethylene wax, micropowder wax, epoxy resin, silicone resin, phenol-formaldehyde resin or polystyrene, the weight per cent is 10-20%, the component A is one or more of talc, graphite, alumina, supramoly, aluminium nitride, boron nitride or aluminium silicate. The release agent of the invention is difficult to react even being heated, because of having powdery or particle-shaped form and with good chemical stability. In addition, after being used, without polluting the water quality and waste water releasing and processing problem, without polluting the environment, also reducing energy sources consuming. In a word, using the release agent of the invention can settle traditional problems of release agent, the invention improves quality of the casting, prolongs lifetime of the mould and reduces environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a powder release agent for die casting. technical background [0002] The release agent is to prevent the formed metal material product from sticking to the mold, and to apply a type of isolation film between the product and the mold, so that the product can be easily released from the mold, while ensuring the surface quality of the product and the mold are intact. In view of the characteristics of high forming temperature and strong mold stickiness of molten metal in die casting, a good mold release agent should have good mold release properties, be able to form a complete shielding layer during the metal forming process, and have a low coefficient of friction. It has good lubricity to ensure its lubricating and demoulding performance; in addition, it must have good heat insulation to make the mold work at a lower temperature and prolong the life of the mold; good th...

AI Technical Summary

Problems solved by technology

However, more and more practices have shown that there are many problems in the use of water-based release agents, such as improper coordination can cause castings to be strained, mold sticky, or surface wrinkles, deposition and other defects; the gas in the water-based release agent and The residue also has a certain influence on the entrainment defects of die casting

For example, if the ratio of release agent to water is too small (more than 1:130) or the amount of spraying is too small, a thinner film will be formed, which will cause local oil film breakage, poor mold release, and strain on die castings , mold sticking and other phenomena; if the ratio of release agent to water is too large, and the amount of spraying is too much, a thicker film will be formed, which will cause the release agent film to form slowly, the solution will flow and accumulate, gas will be generated, and the surface of the die-casting will form Wrinkles, deposits, etc.