| 摘要 |
PROBLEM TO BE SOLVED: To improve both slipping prevention by stick slip generation, and cold resistance in hydraulic fluid.SOLUTION: Hydraulic fluid which uses glycol as a base material includes: (a). 0.01 to 1 wt.% alkylamine compound or alkenyl amine compound including specified C 6 to 20; (b) 0.01 to 1 wt.% phosphoric ester expressed by formula 2: [R(AO)]-P-(OH), (where, Ris an alkyl group of C 4 to 20, AO is ethylene oxide or propylene oxide, n is 4 to 20, m is 1 to 3); (c) 1 to 25 wt.% specified monoalkyl ether of polyoxyethylene polyoxypropylene copolymer which number average molecular weight is 800 to 4,000, and/or glycerin-polyoxypropylene adduct expressed by formula 4. |
