Keywords: polyglycol, Quenching medium, Polyether, water, temperature, workpiece,

Quenching medium for aqueous polyether solution
Polyether (polyglycol) is a copolymer obtained by different ratios of ethylene oxide and propylene oxide, and its molecular structure is:

Its aqueous solution has reverse solubility, that is, it is completely soluble in water at room temperature, and its solubility decreases with the increase of temperature. When the temperature of the solution rises to a certain 1 critical value, turbidity occurs. This 1 temperature is called cloud point. Continue to raise the temperature (usually 70~75 ℃), the polyether is completely dissolved and precipitated from the aqueous solution, this temperature is called the reverse melting point. It redissolves in water when the temperature drops. This reverse solubility of the aqueous polyether solution is advantageous in preventing quenching cracking and reducing distortion of the workpiece.

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