Motor vehicle antifreeze fluid additive with high corrosion inhibition performance and preparation method thereof

Abstract

The invention relates to a motor vehicle antifreeze fluid additive with high corrosion inhibition performance and a preparation method thereof and belongs to the technical field of antifreeze fluid. The motor vehicle antifreeze fluid additive is prepared from, by weight, 5-10 parts of ammonium nitrate, 3-5 parts of sodium pyrophosphate, 2-4 parts of sodium phosphate, 1-2 parts of sodium molybdate benzene, 1-3 parts of benzotriazole, 0.5-1 part of itaconic acid homopolymer, 0.1-0.3 part of methyl benzotriazole, 0.1-0.3 part of polyoxyethylene alkylphenol ether, 0.2-0.4 part of thiourea or thiourea derivative, 0.1-0.3 part of mildew preventive, 0.2-0.4 part of hydrocarbon imidazoline quaternary ammonium salt and 0.5-1 part of nonionic surfactant. Amine, borax and silicate are not added to the antifreeze fluid additive, environment is not influenced, the problem of scaling is avoided, the freezing point is low, and good corrosion resistant performance is achieved.

Description

technical field [0001] The invention relates to a highly corrosion-inhibiting automotive antifreeze additive and a preparation method thereof, belonging to the technical field of antifreeze. Background technique [0002] Automobile antifreeze is the circulating medium used in the cooling system of automobile engine, the most commonly used is water. Water has many advantages, such as: wide source, non-toxic, cheap, good thermal conductivity and so on. Water has long been used as a coolant in automobile engines. But water has many disadvantages, such as high freezing point, when the temperature is lower than 0 ℃, water will freeze to increase its volume. It is easy to cause the water tank or cooling system pipes to burst; the boiling point of water is low, and when the temperature is high in summer, when the engine is running under harsh conditions, the water temperature will rise or even boil, which will affect the normal driving of the car; metal salts dissolved in water ...

AI Technical Summary

Problems solved by technology

First, the use of salt solution (such as calcium chloride, magnesium chloride, sodium nitrate, sodium nitrite) can lower the freezing point to below -30°C, but it cannot solve the rust problem

The freezing point can also be lowered with sugar and honey, and it does not corrode metals, but it is expensive and has poor thermal stability

Although kerosene and diesel oil are used as coolants with low freezing points, they are poor in heat transfer, easy to burn, and have a swelling effect on rubber, so they are not used.

Before and after World War II, methanol and ethanol were used as coolants. Although they are cheap and have a low freezing point, they cannot be ideal coolants due to their low boiling point, volatile, and flammable properties.

However, the silicate contained in the above-mentioned antifreeze will precipitate some colloidal precipitates, which will easily reduce its corrosion inhibition performance, and cause the heat transfer efficiency of the formula to decrease during use, resulting in damage to the engine itself due to excessive temperature.

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