Water-in-oil emulsion hydraulic fluids

Abstract

Abstract STABLE, WATER-IN-OIL EMULSIONS ARE PROVIDED BY EMULSIFYING WATER AND MINERAL OIL WITH OIL-SOLUBLE MIXED IMIDES OF STYRENE-MALEIC ANHYDRIDE COPOLYMERS WHICH ARE IMIDIZED TO AT LEAST ABOUT 50 MOLE PERCENT AND PREFERABLY ABOUT 100 MOLE PERCENT. THESE EMULSIONS CAN BE READILY FORMED BY DISSOLVING IN MINERAL OIL AN EMULSIFING AMOUNT, SUCH AS ABOUT 2 TO 15 PERCENT BY WEIGHT OF THE OIL, OF THE MIXED IMIDE AND MIXING WITH UP TO ABOUT AN EQUAL OR MORE AMOUNT OF WATER. THE OIL-SOLUBLE MIXED IMIDE IS THE REACTION PRODUCT OF A STRENE-MALEIC ANHYDRIDE COPOLYMER WITH A DIALKYLAMINOALKYLAMINE, SUCH AS DIMETHYLAMINOPROPYLAMINE, AND A PRIMARY ALKYLAMINE, SUCH AS N-STEARYLAMINE OR A C20-22 PRIMARY ALKYLAMINE, IN A MOLE RATIO OF DIALKYLAMINOALKYLAMINE TO PRIMARY ALKYLAMINE OF ABOUT 1.3 TO LESS THAN AOUT 2:1, THE TOTAL AMOUNT OF AMINES BEING SUFFICIENT TO IMDIZE AT LEAST ABOUT 50 MOLE PERCENT, AND PREFERABLY ABOUT 100 MOLE PERCENT, OF THE STYRENE-MALEIC ANHYDRIDE COPOLYMER. THESE EMULSIONS POSSESS GOOD STABILITY AND RUST INHIBITING PROPERTIES. THEY CAN BE USED AS LUBRICATING COMPOSITIONS AND HYDRAUBLIC FLUIDS.

Inventors

• 👤 Michael A Stram
• 👤 Charles L Zuraw

Bibliographic Details