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Matters needing attention when using octylene glycol preservative as a coolant

Jul 10, 2019

Octyl glycol preservative should be used when used as a brine

1. The freezing point changes with the concentration of octyl glycol preservative in aqueous solution. When the concentration is below 60%, the freezing point of ethylene glycol in aqueous solution increases, but after the concentration exceeds 60%, When the concentration of alcohol increases, the freezing point increases, and the viscosity increases with the increase of concentration. When the concentration reaches 99,9%, the freezing point rises to -13, 2 ° C, which is an important reason why the concentrated antifreeze (antifreeze mother liquor) can not be used directly, and must be brought to the attention of the user.

2. The octyl glycol preservative contains hydroxyl groups. It works for a long time at 80 degrees Celsius to 90 degrees Celsius. Ethylene glycol is first oxidized to glycolic acid and then oxidized to oxalic acid.

That is, oxalic acid (oxalic acid) contains two carboxyl groups. Oxalic acid and its by-products first affect the central nervous system, followed by the heart, and then the kidneys. Excessive amounts of ethylene glycol can cause death if not treated properly. , ethylene glycol oxalic acid, causing corrosion to the equipment and causing it to leak. Therefore, in the formulated antifreeze, a preservative must also be provided to prevent corrosion of steel and aluminum and scale formation. To understand and solve the corrosion problem of ethylene glycol aqueous solution, you can search on Baidu. Xing Guigang 3. Ethylene glycol itself is a relatively active substance, which is easily polymerized into a high molecular polymer, further oxidized into a polymer organic acid (so-called sludge) to form a very viscous substance, which is easy to scale after deposition; Ethylene glycol reacts with oxygen to form trace amounts of formic acid and acetic acid.

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