Cooling fluid of engine

Abstract

This invention discloses an engine cooling liquid, which comprises: ethylene glycol, fatty acid and its alkali metal salts, polytricarboxylic sodium silicate, silicate stabilizer, azole compound, antifoamer and deionized water. The cooling liquid does not comprise toxic or pollutive matters such as amine, nitrite, phosphate and imidazole, thus can effectively prevent corrosion to metal and nonmetal materials, especially soldering tin, aluminum and their alloys. Besides, the cooling liquid can avoid gelation or precipitation, and can maintain the stability at a low concentration and a large pH value variation.

Description

technical field [0001] The invention relates to an engine coolant, which belongs to the technical field of chemical compositions. technical background [0002] Water has long been used as engine coolant in automobile engines. However, the freezing point is high. When the temperature is lower than 0°C, the volume of water will increase due to freezing, which will easily cause the water tank or cooling system pipes to burst; the metal salts dissolved in water will form scale after being heated, which will reduce the heat transfer efficiency; water will also cause Corrosion of metals in the engine cooling system. People use salt aqueous solution (such as calcium chloride, magnesium chloride, sodium nitrate, sodium nitrite) to lower the freezing point to below -30°C, but it cannot solve the problem of metal corrosion. Later, it was found that the performance of ethylene glycol aqueous solution is good. At a certain ratio, the freezing point can reach below -60°C, and the boili...

AI Technical Summary

Problems solved by technology

However, the use of all-organic acid engine coolant is limited due to its high production cost and easy cavitation corrosion.

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