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国外冬季使用的拖拉机冷却系,大多采用乙二醇一水型防冻液,它是由乙二醇与水以一定的比例掺合而成。防冻液的冰点(液体冷却至肉眼可见微小晶粒时的最高温度)与乙二醇和水的掺合比例有关,参阅表1。由表可见,防冻液的冰点随乙二醇的含量增加而降低,最低可降至-68℃,此时乙二醇的含量为68.1％(以重量计)。如果乙二醇的含量再增加,冰点反而会升高。配制时,应根据拖拉机使用地区最低气温来确定掺合比例,使配制的防冻液冰点比最低气温低5℃。例如:当地严冬时,最低气
Tractor cooling system used abroad in winter, mostly using ethylene glycol monohydrate antifreeze, it is by a certain percentage of ethylene glycol and water blend together. The freezing point of the antifreeze (the maximum temperature at which the liquid cools to such an extent that it is visible to the naked eye) is related to the blending ratio of ethylene glycol and water, see Table 1. It can be seen from the table that the freezing point of the antifreeze decreases with the increase of the ethylene glycol content, and the minimum temperature can drop to -68 ° C, at which time the ethylene glycol content is 68.1% by weight. If the content of ethylene glycol increases, the freezing point will increase instead. The preparation should be based on the minimum temperature in the tractor to determine the mixing ratio, so that the preparation of antifreeze freezing point 5 ℃ lower than the minimum temperature. For example: the local winter, the lowest gas