Definition: coolant, also known as antifreeze, is composed of antifreeze additives and additives to prevent metal corrosion and water. It needs to be anti - freeze, anti - corrosion, thermal conductivity and invariant properties. Now often use ethylene glycol as the main component, plus anti-corrosion additives and water antifreeze.
The engine cooling system of internal combustion vehicle is a liquid-cooled closed circulation system composed of cylinder, jacket and water tank. The working state of the cooling system directly affects the normal operation and service life of the vehicle. Antifreeze is the cooling medium of circulating cooling system of internal combustion engine. It is mainly composed of antifreeze, corrosion inhibitor, defoaming agent, colorant, mildew inhibitor, buffer and so on. Glycol antifreeze
Ethylene glycol is a colorless, slightly sticky liquid, the boiling point is 197.4 ℃, freezing temperature is 11.5 ℃, can mix with water at any proportion. After mixing, the freezing point of the cooling water decreases significantly due to changing the vapor pressure of the cooling water. The degree of decrease decreases with the increase of glycol content to a certain extent. When the content of ethylene glycol was 68%, freezing point can be reduced to - 68 ℃, exceeds this limit, freezing point to rise instead. Ethylene glycol antifreeze in use is easy to produce acidic substances, metal corrosion. Therefore, the right amount of hydrogen phosphate disodium should be added to prevent corrosion. Glycol is toxic, but because of its high boiling point, it does not produce steam to be inhaled into the body and cause poisoning. Glycol is highly absorbent, the storage container should be sealed to prevent overflow after water absorption. Since water has a lower boiling point than glycol, it is water that is evaporated during use, and when there is a shortage of coolant, simply add clean water. This antifreeze can be recycled after use (prevent oil products), after precipitation, filtration, adding water to adjust the concentration, adding preservatives, but also continue to use, generally available for 3-5 years. But you have to filter it multiple times to prevent damage to your car. Glycol is a colorless, slightly viscous liquid with a boiling point of 197. 4 ℃, freezing point is - 11. 5 ℃, it can mix with water at any proportion. There are many people think that the freezing point of glycol is very low, the freezing point of antifreeze is a neutral freezing point of glycol and water mixed in accordance with different proportions, in fact, it is not, after mixing because of changing the vapor pressure of cooling water, the freezing point will be significantly reduced. The degree of decrease decreases with the increase of glycol content to a certain extent, but the freezing point will rise once it exceeds a certain proportion. When the content of ethylene glycol was 68%, freezing point can be reduced to - 68 ℃, exceeds this limit, freezing point to rise instead. 40% of ethylene glycol and 60% of soft water blending with antifreeze, anti-freezing temperature is 25 ℃. When the ethylene glycol in antifreeze and water 50%, anti-freezing temperature 35 ℃ to -.
Diethylene glycol antifreeze
Diethylene glycol - water antifreeze, not volatile and fire, corrosion of metal is also small, but the effect of diethylene glycol lower freezing point than glycol, the preparation of the same freezing point antifreeze, than the amount of glycol, at the same time the heat transfer efficiency decreases. In order to reduce costs, many manufacturers will mix glycol with diethylene glycol.
Glycerine -- water antifreeze glycerine -- water antifreeze, unfavorable volatilization and fire, corrosivity to metal is small also, but the efficiency that glycerine reduces freezing point is low, when the antifreeze fluid that makes up same freezing point, the dosage that compares glycol, alcohol is big. Therefore, this antifreeze is used less.
Alcohol and water antifreeze
The boiling point of alcohol is 78.3 ℃, freezing point is 114 ℃. Wine and water can be mixed in any proportion to form antifreeze at different freezing points. The higher the alcohol content, the lower the freezing point. Alcohol is flammable, when the alcohol content of antifreeze reached more than 40%, it is easy to produce alcohol vapor and fire. Therefore, fangdongye shoulds not be more than 40% of alcohol content, freezing point limit around - 30 ℃. Alcohol - water antifreeze has the advantages of good fluidity, fast heat dissipation, convenient material selection and simple preparation. Its disadvantages are easy to catch fire, low boiling point of alcohol, evaporation loss. After alcohol evaporates, antifreeze composition changes and freezing point increases. The car that runs in mountainous area, plateau area is unfavorable use alcohol - water antifreeze fluid, because alcohol evaporates loss is big. General area driving should regularly detect the content of alcohol, timely supplement.  many countries have done a lot of research on this, constantly introducing patent formula and excellent antifreeze products. The penetration rate of antifreeze in some advanced countries has reached 100 %. The popularity rate of domestic antifreeze is lower, the antifreeze that the market sells has considerable amount to be imported, because the price is higher, use at importing vehicle commonly. Although in recent years domestic antifreeze production has grown rapidly, but many products due to the lack of strict quality inspection and unified inspection standards. Therefore, it is necessary to absorb foreign advanced technology and combined with the reality of China, the development and production of multi-functional high-efficiency antifreeze fluid to meet the growing market demand.
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