초록

The preparation of propylene glycol compositions containing alkali metal silicates having improved gel resistance is provided by forming a silicate premix having effective amounts of inorganic base compound(s) and water. The silicate premix is then added to the propylene glycol.

대표청구항 ▼

A process for the preparation of propylene glycol-containing antifreeze compositions having improved gel resistance comprising 85 to 98 weight percent propylene glycol, a corrosion inhibiting amount of an alkali metal silicate, at least one basic inorganic compound and water which comprises: (a) for

A process for the preparation of propylene glycol-containing antifreeze compositions having improved gel resistance comprising 85 to 98 weight percent propylene glycol, a corrosion inhibiting amount of an alkali metal silicate, at least one basic inorganic compound and water which comprises: (a) forming a silicate premix containing alkali metal silicate, a basic inorganic compound selected from the group consisting of alkali metal hydroxide, alkali metal carbonate and alkali metal phosphate, and water, wherein the silica to alkali metal oxide mole ratio (SiO2:M2O) is less than about 0.25, and adding an effective amount of water to said premix to provide at least about 60 weight percent water in the premix, to thereby prevent gel formation when said silicate premix is added to said propylene glycol; and (b) adding the silicate premix of step (a) to said propylene glycol.