Motor vehicle antifreeze fluid and preparation method thereof

Abstract

The invention discloses a motor vehicle antifreeze fluid and a preparation method of the motor vehicle antifreeze fluid, and belongs to the field of auto accessories. A slow corrosion inhibitor is prepared from waste cooking oil through the processes of pretreatment, quaterisation reaction and the like, an imidazoline intermediate is obtained through the reaction of the slow corrosion inhibitor and hydroxyethyl ethylenediamine at the high temperature, an imidazoline quaternary ammonium corrosion inhibitor is obtained after the quaterisation of the imidazoline intermediate through benzyl chloride, an imidazole ring and a polar group in the molecule interact, the imidazoline quaternary ammonium corrosion inhibitor is preferentially adsorbed onto the surface of metal in the adsorption and isfavorable for forming a stable protection film on the surface of the metal, moreover, a dense hydrophobic film is formed far from the surface of the metal due to the free moving and extending of a hydrophobic branch and hinders the contact between a corrosive medium and a metal matrix, and the effect of relieving the metal corrosion is achieved. The motor vehicle antifreeze fluid solves the problems that the motor vehicle antifreeze fluid corrodes a metal part in the use process and also forms a scale easily at present.

Description

technical field [0001] The invention belongs to the field of automobile supplies, and in particular relates to an automobile antifreeze and a preparation method thereof. Background technique [0002] Automobile antifreeze, also known as "antifreeze" or "antifreeze", is called automobile antifreeze coolant, which means a coolant with antifreeze function, in order to make the car continue to be used at low temperatures in winter. Engine coolant will add some substances that can lower the freezing point of water as antifreeze to keep the cooling system from freezing in low temperature weather. [0003] The earliest automobile engines were of two types, water-cooled and air-cooled. Water-cooled engines had a better cooling effect due to heat dissipation through radiators, so they were more and more widely used in high-power automobile engines. Water is a good heat transfer medium, but it does not have antifreeze effect in low temperature weather, so it is necessary to add a sub...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention: the current automobile antifreeze is easy to corrode metal parts during use, and the metal parts corroded for a long time will generate a large amount of rust, which will gradually corrode the metal plate and cause leakage, which is directly related to The service life of the car cooling system is also prone to scale formation. After the scale, the thermal conductivity of the coolant is greatly reduced, the engine temperature rises, and the corrosion is aggravated. This in turn promotes the increase of scale and forms a vicious circle. The scale may also block the pipes of the cooling system. To solve the road problem, provide a kind of automobile antifreeze and its preparation method