Antifreeze on the market is mainly composed of ethylene glycol, propylene glycol, glycerol, phosphate and other ingredients. Antifreeze is formed by mixing a certain amount of water in different proportions. In addition, a certain amount of anti-rust ingredients must be added to the antifreeze. agents, preservatives, dyes and other ingredients.
1. Antifreeze has antifreeze function and has a low freezing point. The freezing point of water is 0℃, and the freezing point of antifreeze can reach -25~-60℃. When parking in cold winter, it can prevent the coolant from freezing and cracking the radiator and freezing the engine cylinder block. 2. Antifreeze has anti-boiling function, and the boiling point of antifreeze is higher than that of water. Boiling point is the temperature at which a liquid boils. Under standard atmospheric pressure, the boiling point of water is 100°C, while the boiling point of antifreeze is higher than 106°C, which can effectively prevent the engine from "boiling". 3. Antifreeze has anti-corrosion function. Since the engine cooling system includes several metals such as steel, aluminum alloy, cast iron, copper and solder used in water tank welding, the cylinder block and cylinder head are generally made of cast aluminum or cast iron, and the water tank is mainly made of copper and brass. , Antifreeze is in long-term contact with these metals and must be able to protect all these metals. The use of deionized water and appropriate additives can prevent the occurrence of various corrosions. 4. Antifreeze has certain lubricating properties. Antifreeze is "oily" and can prevent non-metallic materials such as rubber and plastic from dissolving, swelling, aging, etc. The antifreeze in some vehicles has a lubricating effect on the cooling system. 5. Antifreeze can prevent the formation of scale. Scale is caused by insoluble salt or oxide crystals adhering to the inner surfaces of the cooling system. The main substances that produce scale are calcium sulfate, calcium carbonate, magnesium carbonate, etc. High-quality antifreeze is made of distilled water and added with anti-scale additives. It not only does not generate scale but also has a descaling function.
