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  Lubricative composition for industrial machinery and equipmentThe Patent Description & Claims data below is from USPTO Patent Application 20080058235. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001]The present invention relates to a novel lubricative composition for industrial machinery and equipment, more specifically, to a lubricating oil composition with excellent lubricative characteristics such as the abrasion resistance, the extreme pressure property, the frictional property and the like, as well as excellent in characteristics required according to the use of industrial machinery and equipment, and even more specifically, to a gear oil composition, a lubricating oil composition for paper machines, a lubricating oil composition for slide guides and a hydraulic oil. In particular, the gear oil composition is excellent in the sludge resistance and the extreme pressure property, the lubricating oil composition for paper machines is excellent in the sludge resistance and the extreme pressure property, the lubricating oil composition for slide guides is excellent in both aspects of the frictional property and the anti-stick-slip property, and the hydraulic oil is excellent in all the sludge suppression property, the abrasion resistance and the frictional property. BACKGROUND ART [0002]With respect to the gear oil composition: [0003]High efficiency and energy-saving has been improved remarkably accompanied with the development in the industry, but desires to these improvements are still strong as the endless assignment. High efficiency and low cost are required also to the gears used in various industrial machines. Therefore, the composition having the tendency for high-speed and high-output as the gear oil, tolerant in higher temperature, and tolerant in the operation under higher load is strongly desired. [0004]For example, combining sulfur-based extreme pressure additives or phosphorus-based extreme pressure additives to the gear oil is described in the Patent Document 1 (JP-A No. 10-259394) and Patent Document 2 (JP-A No. 9-208976) related to the gear oil. [0005]However, the conventional gear oil, when used in the gear of the recent industrial machines, was not always sufficient in the sludge resistance and the extreme pressure property. That is, for the use required to have high extreme pressure property and abrasion resistance, a lubricating oil added with the extreme pressure agent such as zinc dialkyldithiophosphate is widely used, but even if these conventional extreme pressure agents are added in small amount, thermal load is increased and a great amount of sludge is generated, and there is tendency to lower thermal and oxidation stability. Therefore, it is difficult for the lubricating oil added with the sulfur-based extreme pressure agent to reach sufficient thermal and oxidation stability in the gear of the recent industrial machines. Meanwhile, the phosphorus-based extreme pressure agent has tendency not to generate sludge easily compared with the sulfur-based extreme pressure agent, but when the phosphorus-based extreme pressure agent is used alone, it is difficult to obtain high extreme pressure property in the gear oil level. [0006]With respect to the lubricating oil composition for paper machines: [0007]Moreover, after making a paper in the paper machine, there is a step of drying the paper, but in the conventional paper machine, the drying time is comparatively long and the drying temperature is also comparatively low. However, in the recent paper machines, the drying time became short in the drying step to improve the production efficiency, as a result, the drying temperature also became very high, and demand for the heat resistance in the lubricating oil used in the paper machine has increased. Also, in the same manner, the demand level of abrasion resistance in the lubricating oil has increased. Furthermore, when making a paper in the paper machine, strong acidic white water is used, but since the white water has tendency to corrode metals, the lubricating oil for paper machines requires the prevention of machine corrosion by the white water. Thus, there is a big demand for performance of heat resistance, abrasion resistance and anticorrosion property in the lubricating oil for paper machines. [0008]Here, in order for the conventional lubricating oil for paper machines to improve abrasion resistance, using the extreme pressure agent is general, but if the extreme pressure agent is used, the heat resistance is deteriorated, and sludge, cocking or the like is easily generated in the lubricating portion. In order to inhibit sludge, using a great amount of metal-based refining agent or ashless dispersant has been considered, but if these are used, the anticorrosion property is lowered, and problems such as the main body of the paper machine being corroded and the like are generated. As a result, it is difficult to satisfy all the required performances such as the heat resistance, abrasion resistance and anticorrosion property. For example, the lubricating oil for paper machines with excellent heat resistance, abrasion resistance and anticorrosion property is suggested in the Patent Document 3 (JP-A No. 2002-97485), but it does not always satisfy the performances. [0009]With respect to the lubricating oil composition for slide guides: [0010]Further, when stick-slip is generated on the slide guide such as a process table of machine tool, its frictional vibration is transferred to the product as is; as a result, problems such as the processing accuracy being decreased and the tool life being reduced from the vibration are generated. Therefore, high anti-stick-slip property between the metal surfaces is demanded in the lubricating oil for slide guides, in addition to the low frictional (the frictional index being low) property. [0011]With respect to the anti-stick-slip property, for example, using the lubricating oil composition which combined a sulfur compound or ester and fatty acid (e.g. see Patent Document 4 (JP-A No. 57-67693)), the lubricating oil composition which combined a sulfur compound and an amine salt of phosphorus compound (e.g., see Patent Document 5 (JP-A No. 51-74005)), and the like are suggested. [0012]Further, with respect to the frictional property, for example, using the lubricating oil composition which combined acidic phosphoric acid ester or its alkyl ammonium salt, phosphorus acid, fatty acid and a straight-chained alkylamine (e.g., see Patent Document 6 (JP-A No. 8-134488)), the lubricating oil composition for slide guides which used phosphorus compound (e.g. see Patent Document 7 (JP-A No. 8-209175)), the lubricating oil for operation machines which combined glycerin ether compounds and phosphoric acid esters or their amine salts (e.g. see Patent Document 8 (JP-A No. 11-209775)), and the like are suggested. [0013]However, having both the frictional property and anti-stick-slip property is not always easy, and the conventional lubricating oil composition for slide guides did not have sufficiently satisfying performances. [0014]With respect to the Hydraulic Oil: [0015]Recently, the hydraulic system has became highly efficient, and in order to carry out high speed and highly precise control, a case for controlling the flow amount and direction of the hydraulic system by a valve such as a spool valve, and a case installing a servo valve has been increased. The performance of such the spool valve or servo valve may be deteriorated to the great extent if sludge is generated in the hydraulic oil, thus the hydraulic oil used in the recent highly efficient system is strongly required to be a sludgeless hydraulic oil which does not generate sludge, in addition to have an excellent abrasive resistance. [0016]Meanwhile, due to the revision of the energy-saving laws, to the factories appointed as the energy supervision appointed factories, energy-saving has become an essential problem. Every year a target value is set, and it is necessary to reduce energy. Therefore, as a part of energy-saving, reducing consumption power of the operation motor in a hydraulic machines used widely in the factories became vary important object. Therefore, the hydraulic oil is required to improve its characteristic in the viewpoint of saving energy. [0017]Accordingly, in order to respond to the above demands, development of a novel hydraulic oil is on process. For example, as the abrasion resistant of the hydraulic oil, a zinc-based abrasion resistant such as zinc dithiophosphate (ZnDTP) is widely used, but the zinc-based abrasion resistant can cause sludge generation. Further, the abrasion resisting effect by using ZnDTP or the like may form rigid film such as iron phosphate on the surface of the metal, and by such film formation, the frictional index of the sliding part is increased, thus it is said to be not preferable in the viewpoint of energy-saving. Here, the investigation on the hydraulic oil which used non-zinc-based abrasion resistant is carried out, for example, the use of non-zinc-based hydraulic oil obtained by combining non-zinc-based abrasion resistant such as aromatic phosphoric ester, phosphorus acid ester and its amine salt, thiophosphate and .beta.-dithiophosphorylated propionic acid compound is suggested instead of ZnDTP as a purpose to secure the sludge resistance and the abrasion resistance (e.g., see Patent Document 9 (JP-A No. 10-67993), Patent Document 10 (JP-A No. 11-217577) and Patent Document 11 (JP-A No. 2002-265971)). [0018]Further, the hydraulic oil obtained by combining complete ester or partial ester of polyhydric alcohol or an oiliness improver such as fatty acid amide, together with an amine-based antioxidant, a phenol-based antioxidant and phosphoric ester into a certain base oil in the purpose of improving the oxidation stability under high pressure and lubricating performances is described (see Patent Document 12 (JP-A No. 09-111277)). DISCLOSURE OF THE INVENTION [0019]The first aspect of the present invention provides a lubricative composition for industrial machinery and equipment which comprises a base oil selected from mineral oils, fats and oils, synthetic oils and mixtures of two or more of them, and at least one additive selected from the following components (A) to (D): Component (A): [0020](A-1) a phosphorus-containing carboxylic acid compound and/or (A-2) a thiophosphoric ester; Continue reading... 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