High-temperature resistant precision casting wax mould core release agent

Abstract

The invention discloses a high-temperature resistant precision casting wax mould core release agent, which is characterized in that the release agent is made by mixing kerosene with 320 heat transfer oil based on the volume ratio of 1:9-11 under a sealed state and then uniformly stirring the obtained mixed oil. Compared with the existing urea core release agent used for precision casting, the high-temperature resistant precision casting wax mould core release agent made by mixing the high-temperature resistant low-price 320 heat transfer oil with the volatile kerosene is adopted for demoulding instead of the expensive release agent; and the price of the 320 heat transfer oil is ***-***, which is greatly lower than the price of the release agent of ***-***, and the 320 heat transfer oil can be normally used for a long time within the range of 50-180 DEG C without deteriorated and ineffective conditions, so no adhesion phenomenon occurs between a core surface and a die surface, thus improving demoulding effect and lowering rejection ratio.

Description

technical field [0001] The invention relates to a release agent for a precision casting wax model core, in particular to a high temperature resistant precision casting wax model core release agent suitable for releasing a wax model core made of urea. Background technique [0002] Due to the advantages of high precision, low surface roughness, high flexibility, strong adaptability, material and labor saving, precision castings are widely used in electronics, petroleum, chemical industry, transportation, light industry, textile, pharmaceutical, medical equipment, pumps, etc. It has been widely used in a wide range of fields such as valve components, especially complex structural accessories. In the investment casting process, the production of the core and the selection of the release agent are crucial. At present, the core used in precision casting is urea core; the release agent used is the high-efficiency aerosol release agent produced by Wuhan Yiqiang Technology Developme...

AI Technical Summary

Problems solved by technology

Although the currently used oily release agent or the compound mixture release agent of several products in the form of water emulsion has lubricating and recyclable properties, it has been proved in use that there are also obvious shortcomings: one is due to When the molten urea is poured into the core, the temperature is as high as 132.7°C, and the compound mixture release agent of several products in the form of oily release agent or water emulsion will deteriorate when the temperature is higher than 50°C, resulting in a decrease in the release effect. Not very ideal, often even after spraying a composite mixture of several products in the form of aerosol release agent, oily release agent or water emulsion release agent, the mold and urea core will stick, and the urea core will also It is difficult to get off from the mold, and the forced demoulding will cause the surface of the urea core to lack flesh due to adhesion, making the surface rough and even a waste product; the second is the compounding of several products in the form of oily release agent or water emulsion The mixture release agent is expensive, generally 48-50 yuan / kg, resulting in high production costs, and the yield is low, with a pass rate of less than 85%; the third is that although the oil-based release agent has good release performance, it cannot Because it contains grease, a considerable amount of grease remains on the surface of the wax pattern after demolding. The existence of these greases directly affects the subsequent pulping and shell making process. Therefore, it must be cleaned, and cleaning requires a large amount of organic solvent acetone. The process is complicated and the cycle is long, and acetone is toxic, flammable, unsafe to use, and the value of acetone is higher, which further increases the production cost; the fourth is that silicone oil and kerosene have been added to the lubricants used in the past. Mixed liquid, due to the large proportion of kerosene, and kerosene has a low flash point, resulting in unsafe use