In the cold winter, most of the locomotives use water in the morning and water in the evening to prevent the body from freezing. However, if you use antifreeze, you can avoid the above troubles. At present, the antifreeze solution widely used at home and abroad is a mixture of glycol and water, which is popular among users because of its relatively low price and reliable quality. However, if it is not used correctly, it will reduce the efficiency and even cause an accident. Based on our practical experience, the relevant matters are introduced as follows:
1. Ethylene glycol is a colorless and odorless viscous liquid with a boiling point of 197 ° C and a freezing point of -11 ° C. When mixed with water, the freezing point changes significantly. When the glycol-water antifreeze is prepared, the freezing point decreases as the ethylene glycol content increases. When the ethylene glycol weight ratio is 68%, the minimum freezing point is -68 °C. After that, the weight ratio of ethylene glycol is increased, and the freezing point rises. Therefore, when formulating antifreeze, the weight of ethylene glycol should not exceed 68%.
2. The antifreeze freezing point should be lower than the local minimum temperature by about 5 °C. For example, if the local minimum temperature is -25 °C, the antifreeze freezing point should be -30 °C, that is, 48% ethylene glycol and 52% water are used. Its specific gravity is 1.063. In addition, in order to prevent corrosion of the machine parts, 4 g of disodium hydrogen phosphate and 1 g of dextrin should be added per liter of antifreeze.
3. Antifreeze has strong penetrating ability. Therefore, the locomotive should be inspected for the cooling system when it is in winter and season maintenance. If there is any leakage in the water tank, water pump or body, it should be repaired before the antifreeze can be poured.
4. The antifreeze will expand when heated, so the tank should not be too full to prevent the antifreeze from overflowing or damaging the tank after the temperature rises.
5. Since the boiling point of the glycol is higher than that of water, the evaporation loss of the antifreeze during use is mainly water. If there is no leakage in the cooling system, it is only necessary to add fresh water. If there is leakage, it is not necessary to only add water, so as to avoid dilution of the antifreeze and increase the freezing point. Therefore, the concentration of the antifreeze should be checked or adjusted according to the specific gravity. It remains within the original freezing point range.
6. Antifreeze is stable in nature, not easy to deteriorate, and can be used continuously for many years. It is recommended to change the antifreeze every two years.
7. Ethylene glycol has certain toxicity, and it should be prevented from getting into the skin or entering the mouth and eyes during preparation or filling. If you have already entered the mouth and eyes, use clean water to wash. Do not eat before washing.
8. Antifreeze will cause foam overflow when it encounters oil, and reduce the heat dissipation effect, so it should be packed in a clean container.
9. Ethylene glycol will burn when exposed to fire. Do not weld or use open flame near the body where the antifreeze leaks.
10. Ethylene glycol is highly hygroscopic and must be stored in a dry place and the container tightly closed.
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