Aqueous composition comprising water-soluble glycerin-based polyalkylene glycols and use thereof
The invention relates to aqueous composition comprising water-soluble glycerin-based polyalkylene glycols as synthetic base oils as well as the use of the composition and the glycerin-based polyalkylene glycols as or in metalworking fluids, wherein the glycerin was consecutively alkoxylated in the following order: first with propylene oxide, followed by ethylene oxide and finally with propylene oxide.
1. A composition comprising
water; and
at least one water-soluble polyalkylene glycol of the formula (I)
wherein independently of each other
R 1 is —(C 3 H 6 O) x1 —(C 2 H 40 ) y1 —(C 3 H 6 O) z1 —H;
R 2 is —(C 3 H 6 O) x2 —(C 2 H 4 O) y2 —(C 3 H 6 O) z2 —H; and
R 3 is —(C 3 H 6 O) x3 —(C 2 H 40 ) y3 —(C 3 H 6 O) z3 —H;
and
x1, x2 and x3 are independently of each other a number of 0 to 6;
y1, y2 and y3 are independently of each other a number of 0 to 40; and
z1, z2 and z3 are independently of each other a number of 0 to 32;
and
x1+x2+x3 has an average value of from 1 to 4;
y1+y2+y3 has an average value of from 2 to 30; and
z1+z2+z3 has an average value of from 1 to 25.
2. The composition according to claim 1 , wherein independent of each other
x1+x2+x3 has an average value of 1.8 to 2.2;
y1+y2+y3 has an average value of 2 to 10; and/or
z1+z2+z3 has an average value of from 1 to 20.
3. The composition according to claim 1 , comprising 30 to 85 wt.-% water.
4. The composition according to claim 1 , comprising 5 to 30 wt.-% of the water-soluble polyalkylene glycol of formula (I).
5. The composition according to claim 1 , further comprising at least one alkanolamine.
6. The composition according to claim 1 , further comprising 0.1 to 15 wt. % of a carboxylic acid.
7. The composition according to claim 1 , wherein the composition comprises no C6 to C16 mono- or di-carboxylic acid.
8. The composition according to claim 1 , comprising 0.1 to 0.5 wt.-% of aminoacetic acid sodium salts, and/or 0.1 to 0.5 wt.-% of at least one biocide.