Non-aqueous coolant for engine

Abstract

The invention relates to a non-aqueous coolant for an engine, which is characterized by comprising the following components in percent by weight: 10-80 percent of ethylene glycol, 10-80 percent of propylene glycol, 5-20 percent of polyol, 0.1-0.8 percent of phosphate-molybdate, 0.2-0.9 percent of silicate ester, 0.1-1 percent of 4-methyl 1H-benzotriazole, 0.2-0.8 percent of citric acid, 0.2-1 percent of sebacic acid, 0.1-1 percent of octanoic acid, 0.4-1.2 percent of citrate and 0.01-0.2 percent of cosolvent. The non-aqueous coolant has freezing point of -30--50 DEG C and boiling point of 130-150 DEG C, and ensures that the cold start of the engine is realized in cold weather; meanwhile, the working temperature of the engine is improved to 95-150 DEG C from the original 85-95 DEG C. The non-aqueous coolant belongs to a non-aqueous system, avoids electrochemical corrosion, and is a buffer system with pH of 7.5-9.5; and the added relevant auxiliaries have active corrosion resistance on aluminum and aluminum alloy and copper.

Description

1. Technical field [0001] The present invention relates to a kind of engine cooling liquid, is exactly a kind of engine cooling liquid without water. 2. Background technology [0002] Coolant is a complex multi-component system, mainly composed of antifreeze, corrosion inhibitor, defoamer, colorant, antifungal agent and buffer. An excellent coolant should have the functions of heat dissipation, anti-corrosion, anti-freezing, high boiling point, anti-scaling and anti-foaming. Antifreeze as an engine coolant has undergone changes from methanol, ethanol, water, salt water, to glycerin, diethylene glycol, and then to ethylene glycol. With the improvement of people's understanding and the development of technology, most antifreezes have been eliminated due to various reasons, such as methanol and ethanol have low boiling points, high vapor pressure and are flammable; salt water mixtures are prone to rust and crystal precipitation; glycerin has a high viscosity , poor antifreeze...

AI Technical Summary

Problems solved by technology

However, the ethylene glycol type coolant currently used generally has a low boiling point, generally 107°C, which cannot meet the high boiling point requirements of high-power engines such as high-performance cars, high-power construction machinery, large buses, and various military vehicles. , the demand for strong anti-corrosion coolant

This kind of coolant can only ensure the normal operation of the engine at a lower temperature, which will cause a large heat loss and insufficient combustion of low-volatile components in the fuel, thereby increasing the content of hydrocarbons in the exhaust gas. Not only pollute the environment, but also reduce fuel efficiency

In addition, ethylene glycol-based coolant is a water-based coolant with high surface tension, low viscosity, and low boiling point. Therefore, when the coolant exceeds 80°C, the coolant will start to vaporize and generate air bubbles, which will not only cause damage to parts. The steam heat resistance layer is formed on the surface, which seriously reduces the heat transfer efficiency. At the same time, it will cause cavitation under the strong pressure of the cooling system, which will affect the life of the cooling system and engine components and increase the failure rate.

In addition, the electrochemical corrosion caused by water-based coolant is difficult to avoid, irreversibly reducing the heat dissipation capacity and service life of the engine cooling system

Finally, ethylene glycol-type cooling liquid is toxic to a certain extent, and some inorganic additives in the cooling liquid are carcinogenic, and once discharged into nature, it will cause great pollution to the environment

With the development of society, people are becoming more and more aware of environmental protection. This kind of coolant can no longer meet the requirements of green environmental protection and will be eliminated sooner or later. It is imperative to find a more environmentally friendly coolant.

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