Abstract: The present invention has its object to provide a lubricating oil for ship propulsor bearings which is high in bearing-damaging pressure, equivalent in lubricity and anticorrosiveness to the conventional mineral oil-based lubricating oils, higher in biodegradability than in the art and miscible with seawater. The present invention provides a lubricating oil for ship propulsor bearings which comprises a water-soluble alkylene glycol and/or polyalkylene glycol (A) with a number average molecular weight of not higher than 1,000 as a base oil as well as a water-soluble thickening agent (B) and a water-soluble anticorrosive agent (C) and in which the content of (A) is 80 to 98% by weight, that of(B) is 1 to 10% by weight and that of(C) is 1 to 10% by weight, relative to the weight of the lubricating oil for ship propulsor bearings and the bearing-damaging pressure at 50° C. is not lower than 3.5 MPa.

Abstract: The present invention provides a lubricant for water-based metal working oil containing polyether (E) represented by the following general formula (1) and having an HLB of 6.1 to 16.0 and a weight-average molecular weight of 500 to 10,000 R1[{(OCH2CH2CH2CH2)m/(OA1)n}(OA2)p—OH]q??(1) [in the formula, R1 denotes a residue such that at least one hydroxyl group is removed from a compound with a carbon number of 1 to 24 having 1 to 6 hydroxyl group(s); A1 denotes an alkylene group with a carbon number of 2 to 4 except a 1,4-butylene group; A2 denotes an alkylene group with a carbon number of 2 to 4; m denotes an integer of 1 or more having an average of 1 to 120; n and p each denotes an integer of 0, 1 or more such that an average of (n+p) is 1 to 200, and n and p are not simultaneously 0; q denotes an integer of 1 to 6; and {(OCH2CH2CH2CH2)m/(OA1)n} in a case where n is an integer of 1 or more denotes a random bond], and water-based metal working oil containing said lubricant.

Abstract: The present invention has its object to provide a lubricating oil for ship propulsor bearings which is high in bearing-damaging pressure, equivalent in lubricity and anticorrosiveness to the conventional mineral oil-based lubricating oils, higher in biodegradability than in the art and miscible with seawater. The present invention provides a lubricating oil for ship propulsor bearings which comprises a water-soluble alkylene glycol and/or polyalkylene glycol (A) with a number average molecular weight of not higher than 1,000 as a base oil as well as a water-soluble thickening agent (B) and a water-soluble anticorrosive agent (C) and in which the content of (A) is 80 to 98% by weight, that of (B) is 1 to 10% by weight and that of (C) is 1 to 10% by weight, relative to the weight of the lubricating oil for ship propulsor bearings and the bearing-damaging pressure at 50° C. is not lower than 3.5 MPa.

Abstract: The fins of an aluminum heat exchanger are treated with a coating composition comprising an alkali silicate and a low-molecular-weight compound having carbonyl and are thereafter heated for drying, whereby a hydrophilic coating is formed over the surfaces of the fins.

Abstract: An aqeuous lubricant comprising a salt of a sulfuric ester of a polyoxyalkylene compound suitable for use in metal working, drilling, bottling and the like operations. The lubricant is an anionic compound of the formula:[R.sub.1 (OA.sub.1).sub.p ].sub.m R.sub.2 [(A.sub.2 O).sub.q SO.sub.3 M].sub.nwherein R.sub.1 is H or an organic group having a hydrocarbon radical of 1 to 22 carbon atoms, at least one R.sub.1 being an organic group having a hydrocarbon radical of 11 to 22 carbon atoms, R.sub.2 is the residue of a compound having 3 to 8 active hydrogen atoms, such as a polyhydric alcohol or a polyamine, OA.sub.1 and A.sub.2 O are each oxyalkylene groups having 2 to 4 carbon atoms, M is a monovalent salt-forming group, p and q are each 0 to 40, the total number of OA.sub.1 and A.sub.2 O groups being 3 to 40, and m and n are integers of 1 or higher, m + n being 3 to 8.